Commit | Line | Data |
---|---|---|
b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
daa93fab SR |
2 | # Select 32 or 64 bit |
3 | config 64BIT | |
104daea1 MY |
4 | bool "64-bit kernel" if "$(ARCH)" = "x86" |
5 | default "$(ARCH)" != "i386" | |
8f9ca475 | 6 | ---help--- |
daa93fab SR |
7 | Say yes to build a 64-bit kernel - formerly known as x86_64 |
8 | Say no to build a 32-bit kernel - formerly known as i386 | |
9 | ||
10 | config X86_32 | |
3120e25e JB |
11 | def_bool y |
12 | depends on !64BIT | |
341c787e IM |
13 | # Options that are inherently 32-bit kernel only: |
14 | select ARCH_WANT_IPC_PARSE_VERSION | |
15 | select CLKSRC_I8253 | |
16 | select CLONE_BACKWARDS | |
341c787e IM |
17 | select MODULES_USE_ELF_REL |
18 | select OLD_SIGACTION | |
daa93fab SR |
19 | |
20 | config X86_64 | |
3120e25e JB |
21 | def_bool y |
22 | depends on 64BIT | |
d94e0685 | 23 | # Options that are inherently 64-bit kernel only: |
e1073d1e | 24 | select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA |
d94e0685 IM |
25 | select ARCH_SUPPORTS_INT128 |
26 | select ARCH_USE_CMPXCHG_LOCKREF | |
27 | select HAVE_ARCH_SOFT_DIRTY | |
28 | select MODULES_USE_ELF_RELA | |
f616ab59 | 29 | select NEED_DMA_MAP_STATE |
09230cbc | 30 | select SWIOTLB |
d94e0685 | 31 | select X86_DEV_DMA_OPS |
f8781c4a | 32 | select ARCH_HAS_SYSCALL_WRAPPER |
1032c0ba | 33 | |
d94e0685 IM |
34 | # |
35 | # Arch settings | |
36 | # | |
37 | # ( Note that options that are marked 'if X86_64' could in principle be | |
38 | # ported to 32-bit as well. ) | |
39 | # | |
8d5fffb9 | 40 | config X86 |
3c2362e6 | 41 | def_bool y |
c763ea26 IM |
42 | # |
43 | # Note: keep this list sorted alphabetically | |
44 | # | |
6471b825 IM |
45 | select ACPI_LEGACY_TABLES_LOOKUP if ACPI |
46 | select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI | |
47 | select ANON_INODES | |
942fa985 | 48 | select ARCH_32BIT_OFF_T if X86_32 |
6471b825 | 49 | select ARCH_CLOCKSOURCE_DATA |
2a21ad57 | 50 | select ARCH_CLOCKSOURCE_INIT |
6471b825 | 51 | select ARCH_DISCARD_MEMBLOCK |
c763ea26 | 52 | select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI |
fa5b6ec9 | 53 | select ARCH_HAS_DEBUG_VIRTUAL |
21266be9 | 54 | select ARCH_HAS_DEVMEM_IS_ALLOWED |
6471b825 | 55 | select ARCH_HAS_ELF_RANDOMIZE |
72d93104 | 56 | select ARCH_HAS_FAST_MULTIPLIER |
316d097c | 57 | select ARCH_HAS_FILTER_PGPROT |
6974f0c4 | 58 | select ARCH_HAS_FORTIFY_SOURCE |
957e3fac | 59 | select ARCH_HAS_GCOV_PROFILE_ALL |
5c9a8750 | 60 | select ARCH_HAS_KCOV if X86_64 |
10bcc80e | 61 | select ARCH_HAS_MEMBARRIER_SYNC_CORE |
c763ea26 | 62 | select ARCH_HAS_PMEM_API if X86_64 |
3010a5ea | 63 | select ARCH_HAS_PTE_SPECIAL |
39208aa7 | 64 | select ARCH_HAS_REFCOUNT |
0aed55af | 65 | select ARCH_HAS_UACCESS_FLUSHCACHE if X86_64 |
092b31aa | 66 | select ARCH_HAS_UACCESS_MCSAFE if X86_64 && X86_MCE |
d2852a22 | 67 | select ARCH_HAS_SET_MEMORY |
ad21fc4f LA |
68 | select ARCH_HAS_STRICT_KERNEL_RWX |
69 | select ARCH_HAS_STRICT_MODULE_RWX | |
ac1ab12a | 70 | select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE |
c6d30853 | 71 | select ARCH_HAS_UBSAN_SANITIZE_ALL |
65f7d049 | 72 | select ARCH_HAS_ZONE_DEVICE if X86_64 |
6471b825 IM |
73 | select ARCH_HAVE_NMI_SAFE_CMPXCHG |
74 | select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI | |
77fbbc81 | 75 | select ARCH_MIGHT_HAVE_PC_PARPORT |
5e2c18c0 | 76 | select ARCH_MIGHT_HAVE_PC_SERIO |
2c870e61 | 77 | select ARCH_SUPPORTS_ACPI |
6471b825 | 78 | select ARCH_SUPPORTS_ATOMIC_RMW |
6471b825 IM |
79 | select ARCH_SUPPORTS_NUMA_BALANCING if X86_64 |
80 | select ARCH_USE_BUILTIN_BSWAP | |
6471b825 IM |
81 | select ARCH_USE_QUEUED_RWLOCKS |
82 | select ARCH_USE_QUEUED_SPINLOCKS | |
ce4a4e56 | 83 | select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
c763ea26 | 84 | select ARCH_WANTS_DYNAMIC_TASK_STRUCT |
38d8b4e6 | 85 | select ARCH_WANTS_THP_SWAP if X86_64 |
6471b825 IM |
86 | select BUILDTIME_EXTABLE_SORT |
87 | select CLKEVT_I8253 | |
6471b825 IM |
88 | select CLOCKSOURCE_VALIDATE_LAST_CYCLE |
89 | select CLOCKSOURCE_WATCHDOG | |
6471b825 | 90 | select DCACHE_WORD_ACCESS |
45471cd9 LT |
91 | select EDAC_ATOMIC_SCRUB |
92 | select EDAC_SUPPORT | |
6471b825 IM |
93 | select GENERIC_CLOCKEVENTS |
94 | select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) | |
95 | select GENERIC_CLOCKEVENTS_MIN_ADJUST | |
96 | select GENERIC_CMOS_UPDATE | |
97 | select GENERIC_CPU_AUTOPROBE | |
61dc0f55 | 98 | select GENERIC_CPU_VULNERABILITIES |
5b7c73e0 | 99 | select GENERIC_EARLY_IOREMAP |
6471b825 IM |
100 | select GENERIC_FIND_FIRST_BIT |
101 | select GENERIC_IOMAP | |
c7d6c9dd | 102 | select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP |
0fa115da | 103 | select GENERIC_IRQ_MATRIX_ALLOCATOR if X86_LOCAL_APIC |
ad7a929f | 104 | select GENERIC_IRQ_MIGRATION if SMP |
6471b825 | 105 | select GENERIC_IRQ_PROBE |
c201c917 | 106 | select GENERIC_IRQ_RESERVATION_MODE |
6471b825 IM |
107 | select GENERIC_IRQ_SHOW |
108 | select GENERIC_PENDING_IRQ if SMP | |
109 | select GENERIC_SMP_IDLE_THREAD | |
110 | select GENERIC_STRNCPY_FROM_USER | |
111 | select GENERIC_STRNLEN_USER | |
112 | select GENERIC_TIME_VSYSCALL | |
7edaeb68 | 113 | select HARDLOCKUP_CHECK_TIMESTAMP if X86_64 |
6471b825 IM |
114 | select HAVE_ACPI_APEI if ACPI |
115 | select HAVE_ACPI_APEI_NMI if ACPI | |
116 | select HAVE_ALIGNED_STRUCT_PAGE if SLUB | |
6471b825 IM |
117 | select HAVE_ARCH_AUDITSYSCALL |
118 | select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE | |
119 | select HAVE_ARCH_JUMP_LABEL | |
b34006c4 | 120 | select HAVE_ARCH_JUMP_LABEL_RELATIVE |
d17a1d97 | 121 | select HAVE_ARCH_KASAN if X86_64 |
6471b825 | 122 | select HAVE_ARCH_KGDB |
9e08f57d DC |
123 | select HAVE_ARCH_MMAP_RND_BITS if MMU |
124 | select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT | |
1b028f78 | 125 | select HAVE_ARCH_COMPAT_MMAP_BASES if MMU && COMPAT |
271ca788 | 126 | select HAVE_ARCH_PREL32_RELOCATIONS |
6471b825 | 127 | select HAVE_ARCH_SECCOMP_FILTER |
f7d83c1c | 128 | select HAVE_ARCH_THREAD_STRUCT_WHITELIST |
afaef01c | 129 | select HAVE_ARCH_STACKLEAK |
6471b825 IM |
130 | select HAVE_ARCH_TRACEHOOK |
131 | select HAVE_ARCH_TRANSPARENT_HUGEPAGE | |
a00cc7d9 | 132 | select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64 |
e37e43a4 | 133 | select HAVE_ARCH_VMAP_STACK if X86_64 |
c763ea26 | 134 | select HAVE_ARCH_WITHIN_STACK_FRAMES |
6471b825 IM |
135 | select HAVE_CMPXCHG_DOUBLE |
136 | select HAVE_CMPXCHG_LOCAL | |
137 | select HAVE_CONTEXT_TRACKING if X86_64 | |
c1bd55f9 | 138 | select HAVE_COPY_THREAD_TLS |
cf4db259 | 139 | select HAVE_C_RECORDMCOUNT |
6471b825 IM |
140 | select HAVE_DEBUG_KMEMLEAK |
141 | select HAVE_DEBUG_STACKOVERFLOW | |
6471b825 | 142 | select HAVE_DMA_CONTIGUOUS |
677aa9f7 | 143 | select HAVE_DYNAMIC_FTRACE |
06aeaaea | 144 | select HAVE_DYNAMIC_FTRACE_WITH_REGS |
03f5781b | 145 | select HAVE_EBPF_JIT |
58340a07 | 146 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
6630a8e5 | 147 | select HAVE_EISA |
5f56a5df | 148 | select HAVE_EXIT_THREAD |
644e0e8d | 149 | select HAVE_FENTRY if X86_64 || DYNAMIC_FTRACE |
6471b825 | 150 | select HAVE_FTRACE_MCOUNT_RECORD |
6471b825 IM |
151 | select HAVE_FUNCTION_GRAPH_TRACER |
152 | select HAVE_FUNCTION_TRACER | |
6b90bd4b | 153 | select HAVE_GCC_PLUGINS |
6471b825 IM |
154 | select HAVE_HW_BREAKPOINT |
155 | select HAVE_IDE | |
156 | select HAVE_IOREMAP_PROT | |
157 | select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64 | |
158 | select HAVE_IRQ_TIME_ACCOUNTING | |
2e9f3bdd | 159 | select HAVE_KERNEL_BZIP2 |
6471b825 IM |
160 | select HAVE_KERNEL_GZIP |
161 | select HAVE_KERNEL_LZ4 | |
2e9f3bdd | 162 | select HAVE_KERNEL_LZMA |
13510997 | 163 | select HAVE_KERNEL_LZO |
6471b825 IM |
164 | select HAVE_KERNEL_XZ |
165 | select HAVE_KPROBES | |
166 | select HAVE_KPROBES_ON_FTRACE | |
540adea3 | 167 | select HAVE_FUNCTION_ERROR_INJECTION |
6471b825 IM |
168 | select HAVE_KRETPROBES |
169 | select HAVE_KVM | |
170 | select HAVE_LIVEPATCH if X86_64 | |
6471b825 | 171 | select HAVE_MEMBLOCK_NODE_MAP |
0102752e | 172 | select HAVE_MIXED_BREAKPOINTS_REGS |
ee9f8fce | 173 | select HAVE_MOD_ARCH_SPECIFIC |
9f132f7e | 174 | select HAVE_MOVE_PMD |
42a0bb3f | 175 | select HAVE_NMI |
6471b825 IM |
176 | select HAVE_OPROFILE |
177 | select HAVE_OPTPROBES | |
178 | select HAVE_PCSPKR_PLATFORM | |
179 | select HAVE_PERF_EVENTS | |
c01d4323 | 180 | select HAVE_PERF_EVENTS_NMI |
92e5aae4 | 181 | select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI |
eb01d42a | 182 | select HAVE_PCI |
c5e63197 | 183 | select HAVE_PERF_REGS |
c5ebcedb | 184 | select HAVE_PERF_USER_STACK_DUMP |
48a8b97c | 185 | select HAVE_RCU_TABLE_FREE if PARAVIRT |
d86564a2 | 186 | select HAVE_RCU_TABLE_INVALIDATE if HAVE_RCU_TABLE_FREE |
6471b825 | 187 | select HAVE_REGS_AND_STACK_ACCESS_API |
6415b38b | 188 | select HAVE_RELIABLE_STACKTRACE if X86_64 && (UNWINDER_FRAME_POINTER || UNWINDER_ORC) && STACK_VALIDATION |
3c88ee19 | 189 | select HAVE_FUNCTION_ARG_ACCESS_API |
d148eac0 | 190 | select HAVE_STACKPROTECTOR if CC_HAS_SANE_STACKPROTECTOR |
c763ea26 | 191 | select HAVE_STACK_VALIDATION if X86_64 |
d6761b8f | 192 | select HAVE_RSEQ |
6471b825 | 193 | select HAVE_SYSCALL_TRACEPOINTS |
6471b825 | 194 | select HAVE_UNSTABLE_SCHED_CLOCK |
7c68af6e | 195 | select HAVE_USER_RETURN_NOTIFIER |
05736e4a | 196 | select HOTPLUG_SMT if SMP |
c0185808 | 197 | select IRQ_FORCED_THREADING |
86596f0a | 198 | select NEED_SG_DMA_LENGTH |
2eac9c2d | 199 | select PCI_DOMAINS if PCI |
625210cf | 200 | select PCI_LOCKLESS_CONFIG if PCI |
6471b825 | 201 | select PERF_EVENTS |
3195ef59 | 202 | select RTC_LIB |
d6faca40 | 203 | select RTC_MC146818_LIB |
6471b825 | 204 | select SPARSE_IRQ |
83fe27ea | 205 | select SRCU |
6471b825 | 206 | select SYSCTL_EXCEPTION_TRACE |
15f4eae7 | 207 | select THREAD_INFO_IN_TASK |
6471b825 IM |
208 | select USER_STACKTRACE_SUPPORT |
209 | select VIRT_TO_BUS | |
6471b825 | 210 | select X86_FEATURE_NAMES if PROC_FS |
7d8330a5 | 211 | |
ba7e4d13 | 212 | config INSTRUCTION_DECODER |
3120e25e JB |
213 | def_bool y |
214 | depends on KPROBES || PERF_EVENTS || UPROBES | |
ba7e4d13 | 215 | |
51b26ada LT |
216 | config OUTPUT_FORMAT |
217 | string | |
218 | default "elf32-i386" if X86_32 | |
219 | default "elf64-x86-64" if X86_64 | |
220 | ||
73531905 | 221 | config ARCH_DEFCONFIG |
b9b39bfb | 222 | string |
73531905 SR |
223 | default "arch/x86/configs/i386_defconfig" if X86_32 |
224 | default "arch/x86/configs/x86_64_defconfig" if X86_64 | |
b9b39bfb | 225 | |
8d5fffb9 | 226 | config LOCKDEP_SUPPORT |
3c2362e6 | 227 | def_bool y |
8d5fffb9 SR |
228 | |
229 | config STACKTRACE_SUPPORT | |
3c2362e6 | 230 | def_bool y |
8d5fffb9 | 231 | |
8d5fffb9 | 232 | config MMU |
3c2362e6 | 233 | def_bool y |
8d5fffb9 | 234 | |
9e08f57d DC |
235 | config ARCH_MMAP_RND_BITS_MIN |
236 | default 28 if 64BIT | |
237 | default 8 | |
238 | ||
239 | config ARCH_MMAP_RND_BITS_MAX | |
240 | default 32 if 64BIT | |
241 | default 16 | |
242 | ||
243 | config ARCH_MMAP_RND_COMPAT_BITS_MIN | |
244 | default 8 | |
245 | ||
246 | config ARCH_MMAP_RND_COMPAT_BITS_MAX | |
247 | default 16 | |
248 | ||
8d5fffb9 SR |
249 | config SBUS |
250 | bool | |
251 | ||
252 | config GENERIC_ISA_DMA | |
3120e25e JB |
253 | def_bool y |
254 | depends on ISA_DMA_API | |
8d5fffb9 | 255 | |
8d5fffb9 | 256 | config GENERIC_BUG |
3c2362e6 | 257 | def_bool y |
8d5fffb9 | 258 | depends on BUG |
b93a531e JB |
259 | select GENERIC_BUG_RELATIVE_POINTERS if X86_64 |
260 | ||
261 | config GENERIC_BUG_RELATIVE_POINTERS | |
262 | bool | |
8d5fffb9 SR |
263 | |
264 | config GENERIC_HWEIGHT | |
3c2362e6 | 265 | def_bool y |
8d5fffb9 SR |
266 | |
267 | config ARCH_MAY_HAVE_PC_FDC | |
3120e25e JB |
268 | def_bool y |
269 | depends on ISA_DMA_API | |
8d5fffb9 | 270 | |
1032c0ba | 271 | config RWSEM_XCHGADD_ALGORITHM |
3120e25e | 272 | def_bool y |
1032c0ba | 273 | |
1032c0ba SR |
274 | config GENERIC_CALIBRATE_DELAY |
275 | def_bool y | |
276 | ||
9a0b8415 | 277 | config ARCH_HAS_CPU_RELAX |
278 | def_bool y | |
279 | ||
1b27d05b PE |
280 | config ARCH_HAS_CACHE_LINE_SIZE |
281 | def_bool y | |
282 | ||
316d097c DH |
283 | config ARCH_HAS_FILTER_PGPROT |
284 | def_bool y | |
285 | ||
dd5af90a | 286 | config HAVE_SETUP_PER_CPU_AREA |
89c9c4c5 | 287 | def_bool y |
b32ef636 | 288 | |
08fc4580 TH |
289 | config NEED_PER_CPU_EMBED_FIRST_CHUNK |
290 | def_bool y | |
291 | ||
292 | config NEED_PER_CPU_PAGE_FIRST_CHUNK | |
11124411 TH |
293 | def_bool y |
294 | ||
801e4062 JB |
295 | config ARCH_HIBERNATION_POSSIBLE |
296 | def_bool y | |
801e4062 | 297 | |
f4cb5700 JB |
298 | config ARCH_SUSPEND_POSSIBLE |
299 | def_bool y | |
f4cb5700 | 300 | |
cfe28c5d SC |
301 | config ARCH_WANT_HUGE_PMD_SHARE |
302 | def_bool y | |
303 | ||
53313b2c SC |
304 | config ARCH_WANT_GENERAL_HUGETLB |
305 | def_bool y | |
306 | ||
8d5fffb9 | 307 | config ZONE_DMA32 |
e0fd24a3 | 308 | def_bool y if X86_64 |
8d5fffb9 | 309 | |
8d5fffb9 | 310 | config AUDIT_ARCH |
e0fd24a3 | 311 | def_bool y if X86_64 |
8d5fffb9 | 312 | |
765c68bd IM |
313 | config ARCH_SUPPORTS_OPTIMIZED_INLINING |
314 | def_bool y | |
315 | ||
6a11f75b AM |
316 | config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
317 | def_bool y | |
318 | ||
d6f2d75a AR |
319 | config KASAN_SHADOW_OFFSET |
320 | hex | |
321 | depends on KASAN | |
322 | default 0xdffffc0000000000 | |
323 | ||
69575d38 SW |
324 | config HAVE_INTEL_TXT |
325 | def_bool y | |
6ea30386 | 326 | depends on INTEL_IOMMU && ACPI |
69575d38 | 327 | |
6b0c3d44 SR |
328 | config X86_32_SMP |
329 | def_bool y | |
330 | depends on X86_32 && SMP | |
331 | ||
332 | config X86_64_SMP | |
333 | def_bool y | |
334 | depends on X86_64 && SMP | |
335 | ||
ccbeed3a TH |
336 | config X86_32_LAZY_GS |
337 | def_bool y | |
8458f8c2 | 338 | depends on X86_32 && !STACKPROTECTOR |
ccbeed3a | 339 | |
2b144498 SD |
340 | config ARCH_SUPPORTS_UPROBES |
341 | def_bool y | |
342 | ||
d20642f0 RH |
343 | config FIX_EARLYCON_MEM |
344 | def_bool y | |
345 | ||
94d49eb3 KS |
346 | config DYNAMIC_PHYSICAL_MASK |
347 | bool | |
348 | ||
98233368 KS |
349 | config PGTABLE_LEVELS |
350 | int | |
77ef56e4 | 351 | default 5 if X86_5LEVEL |
98233368 KS |
352 | default 4 if X86_64 |
353 | default 3 if X86_PAE | |
354 | default 2 | |
355 | ||
2a61f474 MY |
356 | config CC_HAS_SANE_STACKPROTECTOR |
357 | bool | |
358 | default $(success,$(srctree)/scripts/gcc-x86_64-has-stack-protector.sh $(CC)) if 64BIT | |
359 | default $(success,$(srctree)/scripts/gcc-x86_32-has-stack-protector.sh $(CC)) | |
360 | help | |
361 | We have to make sure stack protector is unconditionally disabled if | |
362 | the compiler produces broken code. | |
363 | ||
506f1d07 SR |
364 | menu "Processor type and features" |
365 | ||
5ee71535 RD |
366 | config ZONE_DMA |
367 | bool "DMA memory allocation support" if EXPERT | |
368 | default y | |
369 | help | |
370 | DMA memory allocation support allows devices with less than 32-bit | |
371 | addressing to allocate within the first 16MB of address space. | |
372 | Disable if no such devices will be used. | |
373 | ||
374 | If unsure, say Y. | |
375 | ||
506f1d07 SR |
376 | config SMP |
377 | bool "Symmetric multi-processing support" | |
378 | ---help--- | |
379 | This enables support for systems with more than one CPU. If you have | |
4a474157 RG |
380 | a system with only one CPU, say N. If you have a system with more |
381 | than one CPU, say Y. | |
506f1d07 | 382 | |
4a474157 | 383 | If you say N here, the kernel will run on uni- and multiprocessor |
506f1d07 SR |
384 | machines, but will use only one CPU of a multiprocessor machine. If |
385 | you say Y here, the kernel will run on many, but not all, | |
4a474157 | 386 | uniprocessor machines. On a uniprocessor machine, the kernel |
506f1d07 SR |
387 | will run faster if you say N here. |
388 | ||
389 | Note that if you say Y here and choose architecture "586" or | |
390 | "Pentium" under "Processor family", the kernel will not work on 486 | |
391 | architectures. Similarly, multiprocessor kernels for the "PPro" | |
392 | architecture may not work on all Pentium based boards. | |
393 | ||
394 | People using multiprocessor machines who say Y here should also say | |
395 | Y to "Enhanced Real Time Clock Support", below. The "Advanced Power | |
396 | Management" code will be disabled if you say Y here. | |
397 | ||
395cf969 | 398 | See also <file:Documentation/x86/i386/IO-APIC.txt>, |
c9525a3f | 399 | <file:Documentation/lockup-watchdogs.txt> and the SMP-HOWTO available at |
506f1d07 SR |
400 | <http://www.tldp.org/docs.html#howto>. |
401 | ||
402 | If you don't know what to do here, say N. | |
403 | ||
9def39be JT |
404 | config X86_FEATURE_NAMES |
405 | bool "Processor feature human-readable names" if EMBEDDED | |
406 | default y | |
407 | ---help--- | |
408 | This option compiles in a table of x86 feature bits and corresponding | |
409 | names. This is required to support /proc/cpuinfo and a few kernel | |
410 | messages. You can disable this to save space, at the expense of | |
411 | making those few kernel messages show numeric feature bits instead. | |
412 | ||
413 | If in doubt, say Y. | |
414 | ||
06cd9a7d YL |
415 | config X86_X2APIC |
416 | bool "Support x2apic" | |
19e3d60d | 417 | depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST) |
06cd9a7d YL |
418 | ---help--- |
419 | This enables x2apic support on CPUs that have this feature. | |
420 | ||
421 | This allows 32-bit apic IDs (so it can support very large systems), | |
422 | and accesses the local apic via MSRs not via mmio. | |
423 | ||
06cd9a7d YL |
424 | If you don't know what to do here, say N. |
425 | ||
6695c85b | 426 | config X86_MPPARSE |
6e87f9b7 | 427 | bool "Enable MPS table" if ACPI || SFI |
7a527688 | 428 | default y |
5ab74722 | 429 | depends on X86_LOCAL_APIC |
8f9ca475 | 430 | ---help--- |
6695c85b YL |
431 | For old smp systems that do not have proper acpi support. Newer systems |
432 | (esp with 64bit cpus) with acpi support, MADT and DSDT will override it | |
6695c85b | 433 | |
ddd70cf9 JN |
434 | config GOLDFISH |
435 | def_bool y | |
436 | depends on X86_GOLDFISH | |
437 | ||
76b04384 DW |
438 | config RETPOLINE |
439 | bool "Avoid speculative indirect branches in kernel" | |
440 | default y | |
d5028ba8 | 441 | select STACK_VALIDATION if HAVE_STACK_VALIDATION |
76b04384 DW |
442 | help |
443 | Compile kernel with the retpoline compiler options to guard against | |
444 | kernel-to-user data leaks by avoiding speculative indirect | |
445 | branches. Requires a compiler with -mindirect-branch=thunk-extern | |
446 | support for full protection. The kernel may run slower. | |
447 | ||
e6d42931 JW |
448 | config X86_CPU_RESCTRL |
449 | bool "x86 CPU resource control support" | |
6fe07ce3 | 450 | depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD) |
59fe5a77 | 451 | select KERNFS |
78e99b4a | 452 | help |
e6d42931 | 453 | Enable x86 CPU resource control support. |
6fe07ce3 BM |
454 | |
455 | Provide support for the allocation and monitoring of system resources | |
456 | usage by the CPU. | |
457 | ||
458 | Intel calls this Intel Resource Director Technology | |
459 | (Intel(R) RDT). More information about RDT can be found in the | |
460 | Intel x86 Architecture Software Developer Manual. | |
461 | ||
462 | AMD calls this AMD Platform Quality of Service (AMD QoS). | |
463 | More information about AMD QoS can be found in the AMD64 Technology | |
464 | Platform Quality of Service Extensions manual. | |
78e99b4a FY |
465 | |
466 | Say N if unsure. | |
467 | ||
8425091f | 468 | if X86_32 |
a0d0bb4d RD |
469 | config X86_BIGSMP |
470 | bool "Support for big SMP systems with more than 8 CPUs" | |
471 | depends on SMP | |
472 | ---help--- | |
473 | This option is needed for the systems that have more than 8 CPUs | |
474 | ||
c5c606d9 RT |
475 | config X86_EXTENDED_PLATFORM |
476 | bool "Support for extended (non-PC) x86 platforms" | |
477 | default y | |
8f9ca475 | 478 | ---help--- |
06ac8346 IM |
479 | If you disable this option then the kernel will only support |
480 | standard PC platforms. (which covers the vast majority of | |
481 | systems out there.) | |
482 | ||
8425091f RT |
483 | If you enable this option then you'll be able to select support |
484 | for the following (non-PC) 32 bit x86 platforms: | |
cb7b8023 | 485 | Goldfish (Android emulator) |
8425091f | 486 | AMD Elan |
8425091f RT |
487 | RDC R-321x SoC |
488 | SGI 320/540 (Visual Workstation) | |
83125a3a | 489 | STA2X11-based (e.g. Northville) |
3f4110a4 | 490 | Moorestown MID devices |
06ac8346 IM |
491 | |
492 | If you have one of these systems, or if you want to build a | |
493 | generic distribution kernel, say Y here - otherwise say N. | |
8425091f | 494 | endif |
06ac8346 | 495 | |
8425091f RT |
496 | if X86_64 |
497 | config X86_EXTENDED_PLATFORM | |
498 | bool "Support for extended (non-PC) x86 platforms" | |
499 | default y | |
500 | ---help--- | |
501 | If you disable this option then the kernel will only support | |
502 | standard PC platforms. (which covers the vast majority of | |
503 | systems out there.) | |
504 | ||
505 | If you enable this option then you'll be able to select support | |
506 | for the following (non-PC) 64 bit x86 platforms: | |
44b111b5 | 507 | Numascale NumaChip |
8425091f RT |
508 | ScaleMP vSMP |
509 | SGI Ultraviolet | |
510 | ||
511 | If you have one of these systems, or if you want to build a | |
512 | generic distribution kernel, say Y here - otherwise say N. | |
513 | endif | |
c5c606d9 RT |
514 | # This is an alphabetically sorted list of 64 bit extended platforms |
515 | # Please maintain the alphabetic order if and when there are additions | |
44b111b5 SP |
516 | config X86_NUMACHIP |
517 | bool "Numascale NumaChip" | |
518 | depends on X86_64 | |
519 | depends on X86_EXTENDED_PLATFORM | |
520 | depends on NUMA | |
521 | depends on SMP | |
522 | depends on X86_X2APIC | |
f9726bfd | 523 | depends on PCI_MMCONFIG |
44b111b5 SP |
524 | ---help--- |
525 | Adds support for Numascale NumaChip large-SMP systems. Needed to | |
526 | enable more than ~168 cores. | |
527 | If you don't have one of these, you should say N here. | |
506f1d07 | 528 | |
c5c606d9 RT |
529 | config X86_VSMP |
530 | bool "ScaleMP vSMP" | |
6276a074 | 531 | select HYPERVISOR_GUEST |
c5c606d9 RT |
532 | select PARAVIRT |
533 | depends on X86_64 && PCI | |
534 | depends on X86_EXTENDED_PLATFORM | |
ead91d4b | 535 | depends on SMP |
8f9ca475 | 536 | ---help--- |
c5c606d9 RT |
537 | Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is |
538 | supposed to run on these EM64T-based machines. Only choose this option | |
539 | if you have one of these machines. | |
5e3a77e9 | 540 | |
03b48632 NP |
541 | config X86_UV |
542 | bool "SGI Ultraviolet" | |
543 | depends on X86_64 | |
c5c606d9 | 544 | depends on X86_EXTENDED_PLATFORM |
54c28d29 | 545 | depends on NUMA |
1ecb4ae5 | 546 | depends on EFI |
9d6c26e7 | 547 | depends on X86_X2APIC |
1222e564 | 548 | depends on PCI |
8f9ca475 | 549 | ---help--- |
03b48632 NP |
550 | This option is needed in order to support SGI Ultraviolet systems. |
551 | If you don't have one of these, you should say N here. | |
552 | ||
c5c606d9 RT |
553 | # Following is an alphabetically sorted list of 32 bit extended platforms |
554 | # Please maintain the alphabetic order if and when there are additions | |
506f1d07 | 555 | |
ddd70cf9 JN |
556 | config X86_GOLDFISH |
557 | bool "Goldfish (Virtual Platform)" | |
cb7b8023 | 558 | depends on X86_EXTENDED_PLATFORM |
ddd70cf9 JN |
559 | ---help--- |
560 | Enable support for the Goldfish virtual platform used primarily | |
561 | for Android development. Unless you are building for the Android | |
562 | Goldfish emulator say N here. | |
563 | ||
c751e17b TG |
564 | config X86_INTEL_CE |
565 | bool "CE4100 TV platform" | |
566 | depends on PCI | |
567 | depends on PCI_GODIRECT | |
6084a6e2 | 568 | depends on X86_IO_APIC |
c751e17b TG |
569 | depends on X86_32 |
570 | depends on X86_EXTENDED_PLATFORM | |
37bc9f50 | 571 | select X86_REBOOTFIXUPS |
da6b737b SAS |
572 | select OF |
573 | select OF_EARLY_FLATTREE | |
c751e17b TG |
574 | ---help--- |
575 | Select for the Intel CE media processor (CE4100) SOC. | |
576 | This option compiles in support for the CE4100 SOC for settop | |
577 | boxes and media devices. | |
578 | ||
4cb9b00f | 579 | config X86_INTEL_MID |
43605ef1 | 580 | bool "Intel MID platform support" |
43605ef1 | 581 | depends on X86_EXTENDED_PLATFORM |
edc6bc78 | 582 | depends on X86_PLATFORM_DEVICES |
1ea7c673 | 583 | depends on PCI |
3fda5bb4 | 584 | depends on X86_64 || (PCI_GOANY && X86_32) |
1ea7c673 | 585 | depends on X86_IO_APIC |
7c9c3a1e | 586 | select SFI |
4cb9b00f | 587 | select I2C |
7c9c3a1e | 588 | select DW_APB_TIMER |
1ea7c673 | 589 | select APB_TIMER |
1ea7c673 | 590 | select INTEL_SCU_IPC |
15a713df | 591 | select MFD_INTEL_MSIC |
1ea7c673 | 592 | ---help--- |
4cb9b00f DC |
593 | Select to build a kernel capable of supporting Intel MID (Mobile |
594 | Internet Device) platform systems which do not have the PCI legacy | |
595 | interfaces. If you are building for a PC class system say N here. | |
1ea7c673 | 596 | |
4cb9b00f DC |
597 | Intel MID platforms are based on an Intel processor and chipset which |
598 | consume less power than most of the x86 derivatives. | |
43605ef1 | 599 | |
8bbc2a13 BD |
600 | config X86_INTEL_QUARK |
601 | bool "Intel Quark platform support" | |
602 | depends on X86_32 | |
603 | depends on X86_EXTENDED_PLATFORM | |
604 | depends on X86_PLATFORM_DEVICES | |
605 | depends on X86_TSC | |
606 | depends on PCI | |
607 | depends on PCI_GOANY | |
608 | depends on X86_IO_APIC | |
609 | select IOSF_MBI | |
610 | select INTEL_IMR | |
9ab6eb51 | 611 | select COMMON_CLK |
8bbc2a13 BD |
612 | ---help--- |
613 | Select to include support for Quark X1000 SoC. | |
614 | Say Y here if you have a Quark based system such as the Arduino | |
615 | compatible Intel Galileo. | |
616 | ||
3d48aab1 MW |
617 | config X86_INTEL_LPSS |
618 | bool "Intel Low Power Subsystem Support" | |
5962dd22 | 619 | depends on X86 && ACPI && PCI |
3d48aab1 | 620 | select COMMON_CLK |
0f531431 | 621 | select PINCTRL |
eebb3e8d | 622 | select IOSF_MBI |
3d48aab1 MW |
623 | ---help--- |
624 | Select to build support for Intel Low Power Subsystem such as | |
625 | found on Intel Lynxpoint PCH. Selecting this option enables | |
0f531431 MN |
626 | things like clock tree (common clock framework) and pincontrol |
627 | which are needed by the LPSS peripheral drivers. | |
3d48aab1 | 628 | |
92082a88 KX |
629 | config X86_AMD_PLATFORM_DEVICE |
630 | bool "AMD ACPI2Platform devices support" | |
631 | depends on ACPI | |
632 | select COMMON_CLK | |
633 | select PINCTRL | |
634 | ---help--- | |
635 | Select to interpret AMD specific ACPI device to platform device | |
636 | such as I2C, UART, GPIO found on AMD Carrizo and later chipsets. | |
637 | I2C and UART depend on COMMON_CLK to set clock. GPIO driver is | |
638 | implemented under PINCTRL subsystem. | |
639 | ||
ced3ce76 DB |
640 | config IOSF_MBI |
641 | tristate "Intel SoC IOSF Sideband support for SoC platforms" | |
642 | depends on PCI | |
643 | ---help--- | |
644 | This option enables sideband register access support for Intel SoC | |
645 | platforms. On these platforms the IOSF sideband is used in lieu of | |
646 | MSR's for some register accesses, mostly but not limited to thermal | |
647 | and power. Drivers may query the availability of this device to | |
648 | determine if they need the sideband in order to work on these | |
649 | platforms. The sideband is available on the following SoC products. | |
650 | This list is not meant to be exclusive. | |
651 | - BayTrail | |
652 | - Braswell | |
653 | - Quark | |
654 | ||
655 | You should say Y if you are running a kernel on one of these SoC's. | |
656 | ||
ed2226bd DB |
657 | config IOSF_MBI_DEBUG |
658 | bool "Enable IOSF sideband access through debugfs" | |
659 | depends on IOSF_MBI && DEBUG_FS | |
660 | ---help--- | |
661 | Select this option to expose the IOSF sideband access registers (MCR, | |
662 | MDR, MCRX) through debugfs to write and read register information from | |
663 | different units on the SoC. This is most useful for obtaining device | |
664 | state information for debug and analysis. As this is a general access | |
665 | mechanism, users of this option would have specific knowledge of the | |
666 | device they want to access. | |
667 | ||
668 | If you don't require the option or are in doubt, say N. | |
669 | ||
c5c606d9 RT |
670 | config X86_RDC321X |
671 | bool "RDC R-321x SoC" | |
506f1d07 | 672 | depends on X86_32 |
c5c606d9 RT |
673 | depends on X86_EXTENDED_PLATFORM |
674 | select M486 | |
675 | select X86_REBOOTFIXUPS | |
676 | ---help--- | |
677 | This option is needed for RDC R-321x system-on-chip, also known | |
678 | as R-8610-(G). | |
679 | If you don't have one of these chips, you should say N here. | |
680 | ||
e0c7ae37 | 681 | config X86_32_NON_STANDARD |
9c398017 IM |
682 | bool "Support non-standard 32-bit SMP architectures" |
683 | depends on X86_32 && SMP | |
c5c606d9 | 684 | depends on X86_EXTENDED_PLATFORM |
8f9ca475 | 685 | ---help--- |
b5660ba7 PA |
686 | This option compiles in the bigsmp and STA2X11 default |
687 | subarchitectures. It is intended for a generic binary | |
688 | kernel. If you select them all, kernel will probe it one by | |
689 | one and will fallback to default. | |
d49c4288 | 690 | |
c5c606d9 | 691 | # Alphabetically sorted list of Non standard 32 bit platforms |
d49c4288 | 692 | |
d949f36f | 693 | config X86_SUPPORTS_MEMORY_FAILURE |
6fc108a0 | 694 | def_bool y |
d949f36f LT |
695 | # MCE code calls memory_failure(): |
696 | depends on X86_MCE | |
697 | # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags: | |
d949f36f LT |
698 | # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH: |
699 | depends on X86_64 || !SPARSEMEM | |
700 | select ARCH_SUPPORTS_MEMORY_FAILURE | |
d949f36f | 701 | |
83125a3a AR |
702 | config STA2X11 |
703 | bool "STA2X11 Companion Chip Support" | |
704 | depends on X86_32_NON_STANDARD && PCI | |
b6e05477 | 705 | select ARCH_HAS_PHYS_TO_DMA |
83125a3a AR |
706 | select X86_DEV_DMA_OPS |
707 | select X86_DMA_REMAP | |
708 | select SWIOTLB | |
709 | select MFD_STA2X11 | |
0145071b | 710 | select GPIOLIB |
83125a3a AR |
711 | ---help--- |
712 | This adds support for boards based on the STA2X11 IO-Hub, | |
713 | a.k.a. "ConneXt". The chip is used in place of the standard | |
714 | PC chipset, so all "standard" peripherals are missing. If this | |
715 | option is selected the kernel will still be able to boot on | |
716 | standard PC machines. | |
717 | ||
82148d1d S |
718 | config X86_32_IRIS |
719 | tristate "Eurobraille/Iris poweroff module" | |
720 | depends on X86_32 | |
721 | ---help--- | |
722 | The Iris machines from EuroBraille do not have APM or ACPI support | |
723 | to shut themselves down properly. A special I/O sequence is | |
724 | needed to do so, which is what this module does at | |
725 | kernel shutdown. | |
726 | ||
727 | This is only for Iris machines from EuroBraille. | |
728 | ||
729 | If unused, say N. | |
730 | ||
ae1e9130 | 731 | config SCHED_OMIT_FRAME_POINTER |
3c2362e6 HH |
732 | def_bool y |
733 | prompt "Single-depth WCHAN output" | |
a87d0914 | 734 | depends on X86 |
8f9ca475 | 735 | ---help--- |
506f1d07 SR |
736 | Calculate simpler /proc/<PID>/wchan values. If this option |
737 | is disabled then wchan values will recurse back to the | |
738 | caller function. This provides more accurate wchan values, | |
739 | at the expense of slightly more scheduling overhead. | |
740 | ||
741 | If in doubt, say "Y". | |
742 | ||
6276a074 BP |
743 | menuconfig HYPERVISOR_GUEST |
744 | bool "Linux guest support" | |
8f9ca475 | 745 | ---help--- |
6276a074 BP |
746 | Say Y here to enable options for running Linux under various hyper- |
747 | visors. This option enables basic hypervisor detection and platform | |
748 | setup. | |
506f1d07 | 749 | |
6276a074 BP |
750 | If you say N, all options in this submenu will be skipped and |
751 | disabled, and Linux guest support won't be built in. | |
506f1d07 | 752 | |
6276a074 | 753 | if HYPERVISOR_GUEST |
506f1d07 | 754 | |
e61bd94a EPH |
755 | config PARAVIRT |
756 | bool "Enable paravirtualization code" | |
8f9ca475 | 757 | ---help--- |
e61bd94a EPH |
758 | This changes the kernel so it can modify itself when it is run |
759 | under a hypervisor, potentially improving performance significantly | |
760 | over full virtualization. However, when run without a hypervisor | |
761 | the kernel is theoretically slower and slightly larger. | |
762 | ||
c00a280a JG |
763 | config PARAVIRT_XXL |
764 | bool | |
765 | ||
6276a074 BP |
766 | config PARAVIRT_DEBUG |
767 | bool "paravirt-ops debugging" | |
768 | depends on PARAVIRT && DEBUG_KERNEL | |
769 | ---help--- | |
770 | Enable to debug paravirt_ops internals. Specifically, BUG if | |
771 | a paravirt_op is missing when it is called. | |
772 | ||
b4ecc126 JF |
773 | config PARAVIRT_SPINLOCKS |
774 | bool "Paravirtualization layer for spinlocks" | |
6ea30386 | 775 | depends on PARAVIRT && SMP |
b4ecc126 JF |
776 | ---help--- |
777 | Paravirtualized spinlocks allow a pvops backend to replace the | |
778 | spinlock implementation with something virtualization-friendly | |
779 | (for example, block the virtual CPU rather than spinning). | |
780 | ||
4c4e4f61 R |
781 | It has a minimal impact on native kernels and gives a nice performance |
782 | benefit on paravirtualized KVM / Xen kernels. | |
b4ecc126 | 783 | |
4c4e4f61 | 784 | If you are unsure how to answer this question, answer Y. |
b4ecc126 | 785 | |
45e898b7 WL |
786 | config QUEUED_LOCK_STAT |
787 | bool "Paravirt queued spinlock statistics" | |
cfd8983f | 788 | depends on PARAVIRT_SPINLOCKS && DEBUG_FS |
45e898b7 WL |
789 | ---help--- |
790 | Enable the collection of statistical data on the slowpath | |
791 | behavior of paravirtualized queued spinlocks and report | |
792 | them on debugfs. | |
793 | ||
6276a074 | 794 | source "arch/x86/xen/Kconfig" |
7af192c9 | 795 | |
6276a074 BP |
796 | config KVM_GUEST |
797 | bool "KVM Guest support (including kvmclock)" | |
798 | depends on PARAVIRT | |
799 | select PARAVIRT_CLOCK | |
800 | default y | |
8f9ca475 | 801 | ---help--- |
6276a074 BP |
802 | This option enables various optimizations for running under the KVM |
803 | hypervisor. It includes a paravirtualized clock, so that instead | |
804 | of relying on a PIT (or probably other) emulation by the | |
805 | underlying device model, the host provides the guest with | |
806 | timing infrastructure such as time of day, and system time | |
506f1d07 | 807 | |
7733607f MW |
808 | config PVH |
809 | bool "Support for running PVH guests" | |
810 | ---help--- | |
811 | This option enables the PVH entry point for guest virtual machines | |
812 | as specified in the x86/HVM direct boot ABI. | |
813 | ||
1e20eb85 SV |
814 | config KVM_DEBUG_FS |
815 | bool "Enable debug information for KVM Guests in debugfs" | |
816 | depends on KVM_GUEST && DEBUG_FS | |
1e20eb85 SV |
817 | ---help--- |
818 | This option enables collection of various statistics for KVM guest. | |
819 | Statistics are displayed in debugfs filesystem. Enabling this option | |
820 | may incur significant overhead. | |
821 | ||
6276a074 BP |
822 | config PARAVIRT_TIME_ACCOUNTING |
823 | bool "Paravirtual steal time accounting" | |
824 | depends on PARAVIRT | |
8f9ca475 | 825 | ---help--- |
6276a074 BP |
826 | Select this option to enable fine granularity task steal time |
827 | accounting. Time spent executing other tasks in parallel with | |
828 | the current vCPU is discounted from the vCPU power. To account for | |
829 | that, there can be a small performance impact. | |
830 | ||
831 | If in doubt, say N here. | |
832 | ||
833 | config PARAVIRT_CLOCK | |
834 | bool | |
97349135 | 835 | |
4a362601 JK |
836 | config JAILHOUSE_GUEST |
837 | bool "Jailhouse non-root cell support" | |
abde587b | 838 | depends on X86_64 && PCI |
87e65d05 | 839 | select X86_PM_TIMER |
4a362601 JK |
840 | ---help--- |
841 | This option allows to run Linux as guest in a Jailhouse non-root | |
842 | cell. You can leave this option disabled if you only want to start | |
843 | Jailhouse and run Linux afterwards in the root cell. | |
844 | ||
6276a074 | 845 | endif #HYPERVISOR_GUEST |
97349135 | 846 | |
506f1d07 SR |
847 | source "arch/x86/Kconfig.cpu" |
848 | ||
849 | config HPET_TIMER | |
3c2362e6 | 850 | def_bool X86_64 |
506f1d07 | 851 | prompt "HPET Timer Support" if X86_32 |
8f9ca475 IM |
852 | ---help--- |
853 | Use the IA-PC HPET (High Precision Event Timer) to manage | |
854 | time in preference to the PIT and RTC, if a HPET is | |
855 | present. | |
856 | HPET is the next generation timer replacing legacy 8254s. | |
857 | The HPET provides a stable time base on SMP | |
858 | systems, unlike the TSC, but it is more expensive to access, | |
4e7f9df2 MT |
859 | as it is off-chip. The interface used is documented |
860 | in the HPET spec, revision 1. | |
506f1d07 | 861 | |
8f9ca475 IM |
862 | You can safely choose Y here. However, HPET will only be |
863 | activated if the platform and the BIOS support this feature. | |
864 | Otherwise the 8254 will be used for timing services. | |
506f1d07 | 865 | |
8f9ca475 | 866 | Choose N to continue using the legacy 8254 timer. |
506f1d07 SR |
867 | |
868 | config HPET_EMULATE_RTC | |
3c2362e6 | 869 | def_bool y |
9d8af78b | 870 | depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) |
506f1d07 | 871 | |
bb24c471 | 872 | config APB_TIMER |
933b9463 AC |
873 | def_bool y if X86_INTEL_MID |
874 | prompt "Intel MID APB Timer Support" if X86_INTEL_MID | |
06c3df49 | 875 | select DW_APB_TIMER |
a0c3832a | 876 | depends on X86_INTEL_MID && SFI |
bb24c471 JP |
877 | help |
878 | APB timer is the replacement for 8254, HPET on X86 MID platforms. | |
879 | The APBT provides a stable time base on SMP | |
880 | systems, unlike the TSC, but it is more expensive to access, | |
881 | as it is off-chip. APB timers are always running regardless of CPU | |
882 | C states, they are used as per CPU clockevent device when possible. | |
883 | ||
6a108a14 | 884 | # Mark as expert because too many people got it wrong. |
506f1d07 | 885 | # The code disables itself when not needed. |
7ae9392c TP |
886 | config DMI |
887 | default y | |
cf074402 | 888 | select DMI_SCAN_MACHINE_NON_EFI_FALLBACK |
6a108a14 | 889 | bool "Enable DMI scanning" if EXPERT |
8f9ca475 | 890 | ---help--- |
7ae9392c TP |
891 | Enabled scanning of DMI to identify machine quirks. Say Y |
892 | here unless you have verified that your setup is not | |
893 | affected by entries in the DMI blacklist. Required by PNP | |
894 | BIOS code. | |
895 | ||
506f1d07 | 896 | config GART_IOMMU |
38901f1c | 897 | bool "Old AMD GART IOMMU support" |
a4ce5a48 | 898 | select IOMMU_HELPER |
506f1d07 | 899 | select SWIOTLB |
23ac4ae8 | 900 | depends on X86_64 && PCI && AMD_NB |
8f9ca475 | 901 | ---help--- |
ced3c42c IM |
902 | Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron |
903 | GART based hardware IOMMUs. | |
904 | ||
905 | The GART supports full DMA access for devices with 32-bit access | |
906 | limitations, on systems with more than 3 GB. This is usually needed | |
907 | for USB, sound, many IDE/SATA chipsets and some other devices. | |
908 | ||
909 | Newer systems typically have a modern AMD IOMMU, supported via | |
910 | the CONFIG_AMD_IOMMU=y config option. | |
911 | ||
912 | In normal configurations this driver is only active when needed: | |
913 | there's more than 3 GB of memory and the system contains a | |
914 | 32-bit limited device. | |
915 | ||
916 | If unsure, say Y. | |
506f1d07 SR |
917 | |
918 | config CALGARY_IOMMU | |
919 | bool "IBM Calgary IOMMU support" | |
a4ce5a48 | 920 | select IOMMU_HELPER |
506f1d07 | 921 | select SWIOTLB |
6ea30386 | 922 | depends on X86_64 && PCI |
8f9ca475 | 923 | ---help--- |
506f1d07 SR |
924 | Support for hardware IOMMUs in IBM's xSeries x366 and x460 |
925 | systems. Needed to run systems with more than 3GB of memory | |
926 | properly with 32-bit PCI devices that do not support DAC | |
927 | (Double Address Cycle). Calgary also supports bus level | |
928 | isolation, where all DMAs pass through the IOMMU. This | |
929 | prevents them from going anywhere except their intended | |
930 | destination. This catches hard-to-find kernel bugs and | |
931 | mis-behaving drivers and devices that do not use the DMA-API | |
932 | properly to set up their DMA buffers. The IOMMU can be | |
933 | turned off at boot time with the iommu=off parameter. | |
934 | Normally the kernel will make the right choice by itself. | |
935 | If unsure, say Y. | |
936 | ||
937 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT | |
3c2362e6 HH |
938 | def_bool y |
939 | prompt "Should Calgary be enabled by default?" | |
506f1d07 | 940 | depends on CALGARY_IOMMU |
8f9ca475 | 941 | ---help--- |
506f1d07 SR |
942 | Should Calgary be enabled by default? if you choose 'y', Calgary |
943 | will be used (if it exists). If you choose 'n', Calgary will not be | |
944 | used even if it exists. If you choose 'n' and would like to use | |
945 | Calgary anyway, pass 'iommu=calgary' on the kernel command line. | |
946 | If unsure, say Y. | |
506f1d07 | 947 | |
1184dc2f | 948 | config MAXSMP |
ddb0c5a6 | 949 | bool "Enable Maximum number of SMP Processors and NUMA Nodes" |
6ea30386 | 950 | depends on X86_64 && SMP && DEBUG_KERNEL |
36f5101a | 951 | select CPUMASK_OFFSTACK |
8f9ca475 | 952 | ---help--- |
ddb0c5a6 | 953 | Enable maximum number of CPUS and NUMA Nodes for this architecture. |
1184dc2f | 954 | If unsure, say N. |
506f1d07 | 955 | |
aec6487e IM |
956 | # |
957 | # The maximum number of CPUs supported: | |
958 | # | |
959 | # The main config value is NR_CPUS, which defaults to NR_CPUS_DEFAULT, | |
960 | # and which can be configured interactively in the | |
961 | # [NR_CPUS_RANGE_BEGIN ... NR_CPUS_RANGE_END] range. | |
962 | # | |
963 | # The ranges are different on 32-bit and 64-bit kernels, depending on | |
964 | # hardware capabilities and scalability features of the kernel. | |
965 | # | |
966 | # ( If MAXSMP is enabled we just use the highest possible value and disable | |
967 | # interactive configuration. ) | |
968 | # | |
969 | ||
970 | config NR_CPUS_RANGE_BEGIN | |
a0d0bb4d | 971 | int |
aec6487e IM |
972 | default NR_CPUS_RANGE_END if MAXSMP |
973 | default 1 if !SMP | |
974 | default 2 | |
a0d0bb4d | 975 | |
aec6487e | 976 | config NR_CPUS_RANGE_END |
a0d0bb4d | 977 | int |
aec6487e IM |
978 | depends on X86_32 |
979 | default 64 if SMP && X86_BIGSMP | |
980 | default 8 if SMP && !X86_BIGSMP | |
981 | default 1 if !SMP | |
a0d0bb4d | 982 | |
aec6487e | 983 | config NR_CPUS_RANGE_END |
a0d0bb4d | 984 | int |
aec6487e IM |
985 | depends on X86_64 |
986 | default 8192 if SMP && ( MAXSMP || CPUMASK_OFFSTACK) | |
987 | default 512 if SMP && (!MAXSMP && !CPUMASK_OFFSTACK) | |
988 | default 1 if !SMP | |
a0d0bb4d | 989 | |
aec6487e | 990 | config NR_CPUS_DEFAULT |
a0d0bb4d RD |
991 | int |
992 | depends on X86_32 | |
aec6487e IM |
993 | default 32 if X86_BIGSMP |
994 | default 8 if SMP | |
995 | default 1 if !SMP | |
a0d0bb4d | 996 | |
aec6487e | 997 | config NR_CPUS_DEFAULT |
a0d0bb4d RD |
998 | int |
999 | depends on X86_64 | |
aec6487e IM |
1000 | default 8192 if MAXSMP |
1001 | default 64 if SMP | |
1002 | default 1 if !SMP | |
a0d0bb4d | 1003 | |
506f1d07 | 1004 | config NR_CPUS |
36f5101a | 1005 | int "Maximum number of CPUs" if SMP && !MAXSMP |
aec6487e IM |
1006 | range NR_CPUS_RANGE_BEGIN NR_CPUS_RANGE_END |
1007 | default NR_CPUS_DEFAULT | |
8f9ca475 | 1008 | ---help--- |
506f1d07 | 1009 | This allows you to specify the maximum number of CPUs which this |
bb61ccc7 | 1010 | kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum |
cad14bb9 | 1011 | supported value is 8192, otherwise the maximum value is 512. The |
506f1d07 SR |
1012 | minimum value which makes sense is 2. |
1013 | ||
aec6487e IM |
1014 | This is purely to save memory: each supported CPU adds about 8KB |
1015 | to the kernel image. | |
506f1d07 SR |
1016 | |
1017 | config SCHED_SMT | |
dbe73364 | 1018 | def_bool y if SMP |
506f1d07 SR |
1019 | |
1020 | config SCHED_MC | |
3c2362e6 HH |
1021 | def_bool y |
1022 | prompt "Multi-core scheduler support" | |
c8e56d20 | 1023 | depends on SMP |
8f9ca475 | 1024 | ---help--- |
506f1d07 SR |
1025 | Multi-core scheduler support improves the CPU scheduler's decision |
1026 | making when dealing with multi-core CPU chips at a cost of slightly | |
1027 | increased overhead in some places. If unsure say N here. | |
1028 | ||
de966cf4 TC |
1029 | config SCHED_MC_PRIO |
1030 | bool "CPU core priorities scheduler support" | |
0a21fc12 IM |
1031 | depends on SCHED_MC && CPU_SUP_INTEL |
1032 | select X86_INTEL_PSTATE | |
1033 | select CPU_FREQ | |
de966cf4 | 1034 | default y |
5e76b2ab | 1035 | ---help--- |
0a21fc12 IM |
1036 | Intel Turbo Boost Max Technology 3.0 enabled CPUs have a |
1037 | core ordering determined at manufacturing time, which allows | |
1038 | certain cores to reach higher turbo frequencies (when running | |
1039 | single threaded workloads) than others. | |
de966cf4 | 1040 | |
0a21fc12 IM |
1041 | Enabling this kernel feature teaches the scheduler about |
1042 | the TBM3 (aka ITMT) priority order of the CPU cores and adjusts the | |
1043 | scheduler's CPU selection logic accordingly, so that higher | |
1044 | overall system performance can be achieved. | |
de966cf4 | 1045 | |
0a21fc12 | 1046 | This feature will have no effect on CPUs without this feature. |
de966cf4 | 1047 | |
0a21fc12 | 1048 | If unsure say Y here. |
5e76b2ab | 1049 | |
30b8b006 TG |
1050 | config UP_LATE_INIT |
1051 | def_bool y | |
ba360f88 | 1052 | depends on !SMP && X86_LOCAL_APIC |
30b8b006 | 1053 | |
506f1d07 | 1054 | config X86_UP_APIC |
50849eef JB |
1055 | bool "Local APIC support on uniprocessors" if !PCI_MSI |
1056 | default PCI_MSI | |
38a1dfda | 1057 | depends on X86_32 && !SMP && !X86_32_NON_STANDARD |
8f9ca475 | 1058 | ---help--- |
506f1d07 SR |
1059 | A local APIC (Advanced Programmable Interrupt Controller) is an |
1060 | integrated interrupt controller in the CPU. If you have a single-CPU | |
1061 | system which has a processor with a local APIC, you can say Y here to | |
1062 | enable and use it. If you say Y here even though your machine doesn't | |
1063 | have a local APIC, then the kernel will still run with no slowdown at | |
1064 | all. The local APIC supports CPU-generated self-interrupts (timer, | |
1065 | performance counters), and the NMI watchdog which detects hard | |
1066 | lockups. | |
1067 | ||
1068 | config X86_UP_IOAPIC | |
1069 | bool "IO-APIC support on uniprocessors" | |
1070 | depends on X86_UP_APIC | |
8f9ca475 | 1071 | ---help--- |
506f1d07 SR |
1072 | An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an |
1073 | SMP-capable replacement for PC-style interrupt controllers. Most | |
1074 | SMP systems and many recent uniprocessor systems have one. | |
1075 | ||
1076 | If you have a single-CPU system with an IO-APIC, you can say Y here | |
1077 | to use it. If you say Y here even though your machine doesn't have | |
1078 | an IO-APIC, then the kernel will still run with no slowdown at all. | |
1079 | ||
1080 | config X86_LOCAL_APIC | |
3c2362e6 | 1081 | def_bool y |
0dbc6078 | 1082 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI |
b5dc8e6c | 1083 | select IRQ_DOMAIN_HIERARCHY |
52f518a3 | 1084 | select PCI_MSI_IRQ_DOMAIN if PCI_MSI |
506f1d07 SR |
1085 | |
1086 | config X86_IO_APIC | |
b1da1e71 JB |
1087 | def_bool y |
1088 | depends on X86_LOCAL_APIC || X86_UP_IOAPIC | |
506f1d07 | 1089 | |
41b9eb26 SA |
1090 | config X86_REROUTE_FOR_BROKEN_BOOT_IRQS |
1091 | bool "Reroute for broken boot IRQs" | |
41b9eb26 | 1092 | depends on X86_IO_APIC |
8f9ca475 | 1093 | ---help--- |
41b9eb26 SA |
1094 | This option enables a workaround that fixes a source of |
1095 | spurious interrupts. This is recommended when threaded | |
1096 | interrupt handling is used on systems where the generation of | |
1097 | superfluous "boot interrupts" cannot be disabled. | |
1098 | ||
1099 | Some chipsets generate a legacy INTx "boot IRQ" when the IRQ | |
1100 | entry in the chipset's IO-APIC is masked (as, e.g. the RT | |
1101 | kernel does during interrupt handling). On chipsets where this | |
1102 | boot IRQ generation cannot be disabled, this workaround keeps | |
1103 | the original IRQ line masked so that only the equivalent "boot | |
1104 | IRQ" is delivered to the CPUs. The workaround also tells the | |
1105 | kernel to set up the IRQ handler on the boot IRQ line. In this | |
1106 | way only one interrupt is delivered to the kernel. Otherwise | |
1107 | the spurious second interrupt may cause the kernel to bring | |
1108 | down (vital) interrupt lines. | |
1109 | ||
1110 | Only affects "broken" chipsets. Interrupt sharing may be | |
1111 | increased on these systems. | |
1112 | ||
506f1d07 | 1113 | config X86_MCE |
bab9bc65 | 1114 | bool "Machine Check / overheating reporting" |
648ed940 | 1115 | select GENERIC_ALLOCATOR |
e57dbaf7 | 1116 | default y |
506f1d07 | 1117 | ---help--- |
bab9bc65 AK |
1118 | Machine Check support allows the processor to notify the |
1119 | kernel if it detects a problem (e.g. overheating, data corruption). | |
506f1d07 | 1120 | The action the kernel takes depends on the severity of the problem, |
bab9bc65 | 1121 | ranging from warning messages to halting the machine. |
4efc0670 | 1122 | |
5de97c9f TL |
1123 | config X86_MCELOG_LEGACY |
1124 | bool "Support for deprecated /dev/mcelog character device" | |
1125 | depends on X86_MCE | |
1126 | ---help--- | |
1127 | Enable support for /dev/mcelog which is needed by the old mcelog | |
1128 | userspace logging daemon. Consider switching to the new generation | |
1129 | rasdaemon solution. | |
1130 | ||
506f1d07 | 1131 | config X86_MCE_INTEL |
3c2362e6 HH |
1132 | def_bool y |
1133 | prompt "Intel MCE features" | |
c1ebf835 | 1134 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 1135 | ---help--- |
506f1d07 SR |
1136 | Additional support for intel specific MCE features such as |
1137 | the thermal monitor. | |
1138 | ||
1139 | config X86_MCE_AMD | |
3c2362e6 HH |
1140 | def_bool y |
1141 | prompt "AMD MCE features" | |
f5382de9 | 1142 | depends on X86_MCE && X86_LOCAL_APIC && AMD_NB |
8f9ca475 | 1143 | ---help--- |
506f1d07 SR |
1144 | Additional support for AMD specific MCE features such as |
1145 | the DRAM Error Threshold. | |
1146 | ||
4efc0670 | 1147 | config X86_ANCIENT_MCE |
6fc108a0 | 1148 | bool "Support for old Pentium 5 / WinChip machine checks" |
c31d9633 | 1149 | depends on X86_32 && X86_MCE |
cd13adcc HS |
1150 | ---help--- |
1151 | Include support for machine check handling on old Pentium 5 or WinChip | |
5065a706 | 1152 | systems. These typically need to be enabled explicitly on the command |
cd13adcc | 1153 | line. |
4efc0670 | 1154 | |
b2762686 AK |
1155 | config X86_MCE_THRESHOLD |
1156 | depends on X86_MCE_AMD || X86_MCE_INTEL | |
6fc108a0 | 1157 | def_bool y |
b2762686 | 1158 | |
ea149b36 | 1159 | config X86_MCE_INJECT |
bc8e80d5 | 1160 | depends on X86_MCE && X86_LOCAL_APIC && DEBUG_FS |
ea149b36 AK |
1161 | tristate "Machine check injector support" |
1162 | ---help--- | |
1163 | Provide support for injecting machine checks for testing purposes. | |
1164 | If you don't know what a machine check is and you don't do kernel | |
1165 | QA it is safe to say n. | |
1166 | ||
4efc0670 AK |
1167 | config X86_THERMAL_VECTOR |
1168 | def_bool y | |
5bb38adc | 1169 | depends on X86_MCE_INTEL |
4efc0670 | 1170 | |
07dc900e | 1171 | source "arch/x86/events/Kconfig" |
e633c65a | 1172 | |
5aef51c3 | 1173 | config X86_LEGACY_VM86 |
1e642812 | 1174 | bool "Legacy VM86 support" |
506f1d07 | 1175 | depends on X86_32 |
8f9ca475 | 1176 | ---help--- |
5aef51c3 AL |
1177 | This option allows user programs to put the CPU into V8086 |
1178 | mode, which is an 80286-era approximation of 16-bit real mode. | |
1179 | ||
1180 | Some very old versions of X and/or vbetool require this option | |
1181 | for user mode setting. Similarly, DOSEMU will use it if | |
1182 | available to accelerate real mode DOS programs. However, any | |
1183 | recent version of DOSEMU, X, or vbetool should be fully | |
1184 | functional even without kernel VM86 support, as they will all | |
1e642812 IM |
1185 | fall back to software emulation. Nevertheless, if you are using |
1186 | a 16-bit DOS program where 16-bit performance matters, vm86 | |
1187 | mode might be faster than emulation and you might want to | |
1188 | enable this option. | |
5aef51c3 | 1189 | |
1e642812 IM |
1190 | Note that any app that works on a 64-bit kernel is unlikely to |
1191 | need this option, as 64-bit kernels don't, and can't, support | |
1192 | V8086 mode. This option is also unrelated to 16-bit protected | |
1193 | mode and is not needed to run most 16-bit programs under Wine. | |
5aef51c3 | 1194 | |
1e642812 IM |
1195 | Enabling this option increases the complexity of the kernel |
1196 | and slows down exception handling a tiny bit. | |
5aef51c3 | 1197 | |
1e642812 | 1198 | If unsure, say N here. |
5aef51c3 AL |
1199 | |
1200 | config VM86 | |
1201 | bool | |
1202 | default X86_LEGACY_VM86 | |
34273f41 PA |
1203 | |
1204 | config X86_16BIT | |
1205 | bool "Enable support for 16-bit segments" if EXPERT | |
1206 | default y | |
a5b9e5a2 | 1207 | depends on MODIFY_LDT_SYSCALL |
34273f41 PA |
1208 | ---help--- |
1209 | This option is required by programs like Wine to run 16-bit | |
1210 | protected mode legacy code on x86 processors. Disabling | |
1211 | this option saves about 300 bytes on i386, or around 6K text | |
1212 | plus 16K runtime memory on x86-64, | |
1213 | ||
1214 | config X86_ESPFIX32 | |
1215 | def_bool y | |
1216 | depends on X86_16BIT && X86_32 | |
506f1d07 | 1217 | |
197725de PA |
1218 | config X86_ESPFIX64 |
1219 | def_bool y | |
34273f41 | 1220 | depends on X86_16BIT && X86_64 |
506f1d07 | 1221 | |
1ad83c85 AL |
1222 | config X86_VSYSCALL_EMULATION |
1223 | bool "Enable vsyscall emulation" if EXPERT | |
1224 | default y | |
1225 | depends on X86_64 | |
1226 | ---help--- | |
1227 | This enables emulation of the legacy vsyscall page. Disabling | |
1228 | it is roughly equivalent to booting with vsyscall=none, except | |
1229 | that it will also disable the helpful warning if a program | |
1230 | tries to use a vsyscall. With this option set to N, offending | |
1231 | programs will just segfault, citing addresses of the form | |
1232 | 0xffffffffff600?00. | |
1233 | ||
1234 | This option is required by many programs built before 2013, and | |
1235 | care should be used even with newer programs if set to N. | |
1236 | ||
1237 | Disabling this option saves about 7K of kernel size and | |
1238 | possibly 4K of additional runtime pagetable memory. | |
1239 | ||
506f1d07 SR |
1240 | config TOSHIBA |
1241 | tristate "Toshiba Laptop support" | |
1242 | depends on X86_32 | |
1243 | ---help--- | |
1244 | This adds a driver to safely access the System Management Mode of | |
1245 | the CPU on Toshiba portables with a genuine Toshiba BIOS. It does | |
1246 | not work on models with a Phoenix BIOS. The System Management Mode | |
1247 | is used to set the BIOS and power saving options on Toshiba portables. | |
1248 | ||
1249 | For information on utilities to make use of this driver see the | |
1250 | Toshiba Linux utilities web site at: | |
1251 | <http://www.buzzard.org.uk/toshiba/>. | |
1252 | ||
1253 | Say Y if you intend to run this kernel on a Toshiba portable. | |
1254 | Say N otherwise. | |
1255 | ||
1256 | config I8K | |
039ae585 | 1257 | tristate "Dell i8k legacy laptop support" |
949a9d70 | 1258 | select HWMON |
039ae585 | 1259 | select SENSORS_DELL_SMM |
506f1d07 | 1260 | ---help--- |
039ae585 PR |
1261 | This option enables legacy /proc/i8k userspace interface in hwmon |
1262 | dell-smm-hwmon driver. Character file /proc/i8k reports bios version, | |
1263 | temperature and allows controlling fan speeds of Dell laptops via | |
1264 | System Management Mode. For old Dell laptops (like Dell Inspiron 8000) | |
1265 | it reports also power and hotkey status. For fan speed control is | |
1266 | needed userspace package i8kutils. | |
1267 | ||
1268 | Say Y if you intend to run this kernel on old Dell laptops or want to | |
1269 | use userspace package i8kutils. | |
506f1d07 SR |
1270 | Say N otherwise. |
1271 | ||
1272 | config X86_REBOOTFIXUPS | |
9ba16087 JB |
1273 | bool "Enable X86 board specific fixups for reboot" |
1274 | depends on X86_32 | |
506f1d07 SR |
1275 | ---help--- |
1276 | This enables chipset and/or board specific fixups to be done | |
1277 | in order to get reboot to work correctly. This is only needed on | |
1278 | some combinations of hardware and BIOS. The symptom, for which | |
1279 | this config is intended, is when reboot ends with a stalled/hung | |
1280 | system. | |
1281 | ||
1282 | Currently, the only fixup is for the Geode machines using | |
5e3a77e9 | 1283 | CS5530A and CS5536 chipsets and the RDC R-321x SoC. |
506f1d07 SR |
1284 | |
1285 | Say Y if you want to enable the fixup. Currently, it's safe to | |
1286 | enable this option even if you don't need it. | |
1287 | Say N otherwise. | |
1288 | ||
1289 | config MICROCODE | |
9a2bc335 BP |
1290 | bool "CPU microcode loading support" |
1291 | default y | |
80030e3d | 1292 | depends on CPU_SUP_AMD || CPU_SUP_INTEL |
506f1d07 SR |
1293 | select FW_LOADER |
1294 | ---help--- | |
1295 | If you say Y here, you will be able to update the microcode on | |
5f9c01aa BP |
1296 | Intel and AMD processors. The Intel support is for the IA32 family, |
1297 | e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, Xeon etc. The | |
1298 | AMD support is for families 0x10 and later. You will obviously need | |
1299 | the actual microcode binary data itself which is not shipped with | |
1300 | the Linux kernel. | |
1301 | ||
1302 | The preferred method to load microcode from a detached initrd is described | |
1897a969 | 1303 | in Documentation/x86/microcode.txt. For that you need to enable |
5f9c01aa BP |
1304 | CONFIG_BLK_DEV_INITRD in order for the loader to be able to scan the |
1305 | initrd for microcode blobs. | |
1306 | ||
c508c46e BG |
1307 | In addition, you can build the microcode into the kernel. For that you |
1308 | need to add the vendor-supplied microcode to the CONFIG_EXTRA_FIRMWARE | |
1309 | config option. | |
506f1d07 | 1310 | |
8d86f390 | 1311 | config MICROCODE_INTEL |
e43f6e67 | 1312 | bool "Intel microcode loading support" |
8f9ca475 IM |
1313 | depends on MICROCODE |
1314 | default MICROCODE | |
1315 | select FW_LOADER | |
1316 | ---help--- | |
1317 | This options enables microcode patch loading support for Intel | |
1318 | processors. | |
1319 | ||
b8989db9 A |
1320 | For the current Intel microcode data package go to |
1321 | <https://downloadcenter.intel.com> and search for | |
1322 | 'Linux Processor Microcode Data File'. | |
8d86f390 | 1323 | |
80cc9f10 | 1324 | config MICROCODE_AMD |
e43f6e67 | 1325 | bool "AMD microcode loading support" |
8f9ca475 IM |
1326 | depends on MICROCODE |
1327 | select FW_LOADER | |
1328 | ---help--- | |
1329 | If you select this option, microcode patch loading support for AMD | |
1330 | processors will be enabled. | |
80cc9f10 | 1331 | |
8f9ca475 | 1332 | config MICROCODE_OLD_INTERFACE |
3c2362e6 | 1333 | def_bool y |
506f1d07 | 1334 | depends on MICROCODE |
506f1d07 SR |
1335 | |
1336 | config X86_MSR | |
1337 | tristate "/dev/cpu/*/msr - Model-specific register support" | |
8f9ca475 | 1338 | ---help--- |
506f1d07 SR |
1339 | This device gives privileged processes access to the x86 |
1340 | Model-Specific Registers (MSRs). It is a character device with | |
1341 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. | |
1342 | MSR accesses are directed to a specific CPU on multi-processor | |
1343 | systems. | |
1344 | ||
1345 | config X86_CPUID | |
1346 | tristate "/dev/cpu/*/cpuid - CPU information support" | |
8f9ca475 | 1347 | ---help--- |
506f1d07 SR |
1348 | This device gives processes access to the x86 CPUID instruction to |
1349 | be executed on a specific processor. It is a character device | |
1350 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to | |
1351 | /dev/cpu/31/cpuid. | |
1352 | ||
1353 | choice | |
1354 | prompt "High Memory Support" | |
6fc108a0 | 1355 | default HIGHMEM4G |
506f1d07 SR |
1356 | depends on X86_32 |
1357 | ||
1358 | config NOHIGHMEM | |
1359 | bool "off" | |
506f1d07 SR |
1360 | ---help--- |
1361 | Linux can use up to 64 Gigabytes of physical memory on x86 systems. | |
1362 | However, the address space of 32-bit x86 processors is only 4 | |
1363 | Gigabytes large. That means that, if you have a large amount of | |
1364 | physical memory, not all of it can be "permanently mapped" by the | |
1365 | kernel. The physical memory that's not permanently mapped is called | |
1366 | "high memory". | |
1367 | ||
1368 | If you are compiling a kernel which will never run on a machine with | |
1369 | more than 1 Gigabyte total physical RAM, answer "off" here (default | |
1370 | choice and suitable for most users). This will result in a "3GB/1GB" | |
1371 | split: 3GB are mapped so that each process sees a 3GB virtual memory | |
1372 | space and the remaining part of the 4GB virtual memory space is used | |
1373 | by the kernel to permanently map as much physical memory as | |
1374 | possible. | |
1375 | ||
1376 | If the machine has between 1 and 4 Gigabytes physical RAM, then | |
1377 | answer "4GB" here. | |
1378 | ||
1379 | If more than 4 Gigabytes is used then answer "64GB" here. This | |
1380 | selection turns Intel PAE (Physical Address Extension) mode on. | |
1381 | PAE implements 3-level paging on IA32 processors. PAE is fully | |
1382 | supported by Linux, PAE mode is implemented on all recent Intel | |
1383 | processors (Pentium Pro and better). NOTE: If you say "64GB" here, | |
1384 | then the kernel will not boot on CPUs that don't support PAE! | |
1385 | ||
1386 | The actual amount of total physical memory will either be | |
1387 | auto detected or can be forced by using a kernel command line option | |
1388 | such as "mem=256M". (Try "man bootparam" or see the documentation of | |
1389 | your boot loader (lilo or loadlin) about how to pass options to the | |
1390 | kernel at boot time.) | |
1391 | ||
1392 | If unsure, say "off". | |
1393 | ||
1394 | config HIGHMEM4G | |
1395 | bool "4GB" | |
8f9ca475 | 1396 | ---help--- |
506f1d07 SR |
1397 | Select this if you have a 32-bit processor and between 1 and 4 |
1398 | gigabytes of physical RAM. | |
1399 | ||
1400 | config HIGHMEM64G | |
1401 | bool "64GB" | |
69b8d3fc | 1402 | depends on !M486 && !M586 && !M586TSC && !M586MMX && !MGEODE_LX && !MGEODEGX1 && !MCYRIXIII && !MELAN && !MWINCHIPC6 && !WINCHIP3D && !MK6 |
506f1d07 | 1403 | select X86_PAE |
8f9ca475 | 1404 | ---help--- |
506f1d07 SR |
1405 | Select this if you have a 32-bit processor and more than 4 |
1406 | gigabytes of physical RAM. | |
1407 | ||
1408 | endchoice | |
1409 | ||
1410 | choice | |
6a108a14 | 1411 | prompt "Memory split" if EXPERT |
506f1d07 SR |
1412 | default VMSPLIT_3G |
1413 | depends on X86_32 | |
8f9ca475 | 1414 | ---help--- |
506f1d07 SR |
1415 | Select the desired split between kernel and user memory. |
1416 | ||
1417 | If the address range available to the kernel is less than the | |
1418 | physical memory installed, the remaining memory will be available | |
1419 | as "high memory". Accessing high memory is a little more costly | |
1420 | than low memory, as it needs to be mapped into the kernel first. | |
1421 | Note that increasing the kernel address space limits the range | |
1422 | available to user programs, making the address space there | |
1423 | tighter. Selecting anything other than the default 3G/1G split | |
1424 | will also likely make your kernel incompatible with binary-only | |
1425 | kernel modules. | |
1426 | ||
1427 | If you are not absolutely sure what you are doing, leave this | |
1428 | option alone! | |
1429 | ||
1430 | config VMSPLIT_3G | |
1431 | bool "3G/1G user/kernel split" | |
1432 | config VMSPLIT_3G_OPT | |
1433 | depends on !X86_PAE | |
1434 | bool "3G/1G user/kernel split (for full 1G low memory)" | |
1435 | config VMSPLIT_2G | |
1436 | bool "2G/2G user/kernel split" | |
1437 | config VMSPLIT_2G_OPT | |
1438 | depends on !X86_PAE | |
1439 | bool "2G/2G user/kernel split (for full 2G low memory)" | |
1440 | config VMSPLIT_1G | |
1441 | bool "1G/3G user/kernel split" | |
1442 | endchoice | |
1443 | ||
1444 | config PAGE_OFFSET | |
1445 | hex | |
1446 | default 0xB0000000 if VMSPLIT_3G_OPT | |
1447 | default 0x80000000 if VMSPLIT_2G | |
1448 | default 0x78000000 if VMSPLIT_2G_OPT | |
1449 | default 0x40000000 if VMSPLIT_1G | |
1450 | default 0xC0000000 | |
1451 | depends on X86_32 | |
1452 | ||
1453 | config HIGHMEM | |
3c2362e6 | 1454 | def_bool y |
506f1d07 | 1455 | depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) |
506f1d07 SR |
1456 | |
1457 | config X86_PAE | |
9ba16087 | 1458 | bool "PAE (Physical Address Extension) Support" |
506f1d07 | 1459 | depends on X86_32 && !HIGHMEM4G |
d4a451d5 | 1460 | select PHYS_ADDR_T_64BIT |
9d99c712 | 1461 | select SWIOTLB |
8f9ca475 | 1462 | ---help--- |
506f1d07 SR |
1463 | PAE is required for NX support, and furthermore enables |
1464 | larger swapspace support for non-overcommit purposes. It | |
1465 | has the cost of more pagetable lookup overhead, and also | |
1466 | consumes more pagetable space per process. | |
1467 | ||
77ef56e4 KS |
1468 | config X86_5LEVEL |
1469 | bool "Enable 5-level page tables support" | |
eedb92ab | 1470 | select DYNAMIC_MEMORY_LAYOUT |
162434e7 | 1471 | select SPARSEMEM_VMEMMAP |
77ef56e4 KS |
1472 | depends on X86_64 |
1473 | ---help--- | |
1474 | 5-level paging enables access to larger address space: | |
1475 | upto 128 PiB of virtual address space and 4 PiB of | |
1476 | physical address space. | |
1477 | ||
1478 | It will be supported by future Intel CPUs. | |
1479 | ||
6657fca0 KS |
1480 | A kernel with the option enabled can be booted on machines that |
1481 | support 4- or 5-level paging. | |
77ef56e4 KS |
1482 | |
1483 | See Documentation/x86/x86_64/5level-paging.txt for more | |
1484 | information. | |
1485 | ||
1486 | Say N if unsure. | |
1487 | ||
10971ab2 | 1488 | config X86_DIRECT_GBPAGES |
e5008abe | 1489 | def_bool y |
4675ff05 | 1490 | depends on X86_64 && !DEBUG_PAGEALLOC |
8f9ca475 | 1491 | ---help--- |
10971ab2 IM |
1492 | Certain kernel features effectively disable kernel |
1493 | linear 1 GB mappings (even if the CPU otherwise | |
1494 | supports them), so don't confuse the user by printing | |
1495 | that we have them enabled. | |
9e899816 | 1496 | |
5c280cf6 TG |
1497 | config X86_CPA_STATISTICS |
1498 | bool "Enable statistic for Change Page Attribute" | |
1499 | depends on DEBUG_FS | |
1500 | ---help--- | |
1501 | Expose statistics about the Change Page Attribute mechanims, which | |
1502 | helps to determine the effectivness of preserving large and huge | |
1503 | page mappings when mapping protections are changed. | |
1504 | ||
7744ccdb TL |
1505 | config ARCH_HAS_MEM_ENCRYPT |
1506 | def_bool y | |
1507 | ||
1508 | config AMD_MEM_ENCRYPT | |
1509 | bool "AMD Secure Memory Encryption (SME) support" | |
1510 | depends on X86_64 && CPU_SUP_AMD | |
94d49eb3 | 1511 | select DYNAMIC_PHYSICAL_MASK |
ce9084ba | 1512 | select ARCH_USE_MEMREMAP_PROT |
7744ccdb TL |
1513 | ---help--- |
1514 | Say yes to enable support for the encryption of system memory. | |
1515 | This requires an AMD processor that supports Secure Memory | |
1516 | Encryption (SME). | |
1517 | ||
1518 | config AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT | |
1519 | bool "Activate AMD Secure Memory Encryption (SME) by default" | |
1520 | default y | |
1521 | depends on AMD_MEM_ENCRYPT | |
1522 | ---help--- | |
1523 | Say yes to have system memory encrypted by default if running on | |
1524 | an AMD processor that supports Secure Memory Encryption (SME). | |
1525 | ||
1526 | If set to Y, then the encryption of system memory can be | |
1527 | deactivated with the mem_encrypt=off command line option. | |
1528 | ||
1529 | If set to N, then the encryption of system memory can be | |
1530 | activated with the mem_encrypt=on command line option. | |
1531 | ||
506f1d07 SR |
1532 | # Common NUMA Features |
1533 | config NUMA | |
fd51b2d7 | 1534 | bool "Numa Memory Allocation and Scheduler Support" |
506f1d07 | 1535 | depends on SMP |
b5660ba7 PA |
1536 | depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP) |
1537 | default y if X86_BIGSMP | |
8f9ca475 | 1538 | ---help--- |
506f1d07 | 1539 | Enable NUMA (Non Uniform Memory Access) support. |
fd51b2d7 | 1540 | |
506f1d07 SR |
1541 | The kernel will try to allocate memory used by a CPU on the |
1542 | local memory controller of the CPU and add some more | |
1543 | NUMA awareness to the kernel. | |
1544 | ||
c280ea5e | 1545 | For 64-bit this is recommended if the system is Intel Core i7 |
fd51b2d7 KM |
1546 | (or later), AMD Opteron, or EM64T NUMA. |
1547 | ||
b5660ba7 | 1548 | For 32-bit this is only needed if you boot a 32-bit |
7cf6c945 | 1549 | kernel on a 64-bit NUMA platform. |
fd51b2d7 KM |
1550 | |
1551 | Otherwise, you should say N. | |
506f1d07 | 1552 | |
eec1d4fa | 1553 | config AMD_NUMA |
3c2362e6 HH |
1554 | def_bool y |
1555 | prompt "Old style AMD Opteron NUMA detection" | |
5da0ef9a | 1556 | depends on X86_64 && NUMA && PCI |
8f9ca475 | 1557 | ---help--- |
eec1d4fa HR |
1558 | Enable AMD NUMA node topology detection. You should say Y here if |
1559 | you have a multi processor AMD system. This uses an old method to | |
1560 | read the NUMA configuration directly from the builtin Northbridge | |
1561 | of Opteron. It is recommended to use X86_64_ACPI_NUMA instead, | |
1562 | which also takes priority if both are compiled in. | |
506f1d07 SR |
1563 | |
1564 | config X86_64_ACPI_NUMA | |
3c2362e6 HH |
1565 | def_bool y |
1566 | prompt "ACPI NUMA detection" | |
506f1d07 SR |
1567 | depends on X86_64 && NUMA && ACPI && PCI |
1568 | select ACPI_NUMA | |
8f9ca475 | 1569 | ---help--- |
506f1d07 SR |
1570 | Enable ACPI SRAT based node topology detection. |
1571 | ||
6ec6e0d9 SS |
1572 | # Some NUMA nodes have memory ranges that span |
1573 | # other nodes. Even though a pfn is valid and | |
1574 | # between a node's start and end pfns, it may not | |
1575 | # reside on that node. See memmap_init_zone() | |
1576 | # for details. | |
1577 | config NODES_SPAN_OTHER_NODES | |
1578 | def_bool y | |
1579 | depends on X86_64_ACPI_NUMA | |
1580 | ||
506f1d07 SR |
1581 | config NUMA_EMU |
1582 | bool "NUMA emulation" | |
1b7e03ef | 1583 | depends on NUMA |
8f9ca475 | 1584 | ---help--- |
506f1d07 SR |
1585 | Enable NUMA emulation. A flat machine will be split |
1586 | into virtual nodes when booted with "numa=fake=N", where N is the | |
1587 | number of nodes. This is only useful for debugging. | |
1588 | ||
1589 | config NODES_SHIFT | |
d25e26b6 | 1590 | int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP |
51591e31 DR |
1591 | range 1 10 |
1592 | default "10" if MAXSMP | |
506f1d07 | 1593 | default "6" if X86_64 |
506f1d07 SR |
1594 | default "3" |
1595 | depends on NEED_MULTIPLE_NODES | |
8f9ca475 | 1596 | ---help--- |
1184dc2f | 1597 | Specify the maximum number of NUMA Nodes available on the target |
692105b8 | 1598 | system. Increases memory reserved to accommodate various tables. |
506f1d07 | 1599 | |
506f1d07 | 1600 | config ARCH_HAVE_MEMORY_PRESENT |
3c2362e6 | 1601 | def_bool y |
506f1d07 | 1602 | depends on X86_32 && DISCONTIGMEM |
506f1d07 | 1603 | |
506f1d07 SR |
1604 | config ARCH_FLATMEM_ENABLE |
1605 | def_bool y | |
3b16651f | 1606 | depends on X86_32 && !NUMA |
506f1d07 SR |
1607 | |
1608 | config ARCH_DISCONTIGMEM_ENABLE | |
1609 | def_bool y | |
b263295d | 1610 | depends on NUMA && X86_32 |
506f1d07 SR |
1611 | |
1612 | config ARCH_DISCONTIGMEM_DEFAULT | |
1613 | def_bool y | |
b263295d CL |
1614 | depends on NUMA && X86_32 |
1615 | ||
506f1d07 SR |
1616 | config ARCH_SPARSEMEM_ENABLE |
1617 | def_bool y | |
6ea30386 | 1618 | depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD |
506f1d07 SR |
1619 | select SPARSEMEM_STATIC if X86_32 |
1620 | select SPARSEMEM_VMEMMAP_ENABLE if X86_64 | |
1621 | ||
3b16651f TH |
1622 | config ARCH_SPARSEMEM_DEFAULT |
1623 | def_bool y | |
1624 | depends on X86_64 | |
1625 | ||
506f1d07 SR |
1626 | config ARCH_SELECT_MEMORY_MODEL |
1627 | def_bool y | |
b263295d | 1628 | depends on ARCH_SPARSEMEM_ENABLE |
506f1d07 SR |
1629 | |
1630 | config ARCH_MEMORY_PROBE | |
a0842b70 | 1631 | bool "Enable sysfs memory/probe interface" |
3120e25e | 1632 | depends on X86_64 && MEMORY_HOTPLUG |
a0842b70 TK |
1633 | help |
1634 | This option enables a sysfs memory/probe interface for testing. | |
1635 | See Documentation/memory-hotplug.txt for more information. | |
1636 | If you are unsure how to answer this question, answer N. | |
506f1d07 | 1637 | |
3b16651f TH |
1638 | config ARCH_PROC_KCORE_TEXT |
1639 | def_bool y | |
1640 | depends on X86_64 && PROC_KCORE | |
1641 | ||
a29815a3 AK |
1642 | config ILLEGAL_POINTER_VALUE |
1643 | hex | |
1644 | default 0 if X86_32 | |
1645 | default 0xdead000000000000 if X86_64 | |
1646 | ||
7a67832c DW |
1647 | config X86_PMEM_LEGACY_DEVICE |
1648 | bool | |
1649 | ||
ec776ef6 | 1650 | config X86_PMEM_LEGACY |
7a67832c | 1651 | tristate "Support non-standard NVDIMMs and ADR protected memory" |
9f53f9fa DW |
1652 | depends on PHYS_ADDR_T_64BIT |
1653 | depends on BLK_DEV | |
7a67832c | 1654 | select X86_PMEM_LEGACY_DEVICE |
9f53f9fa | 1655 | select LIBNVDIMM |
ec776ef6 CH |
1656 | help |
1657 | Treat memory marked using the non-standard e820 type of 12 as used | |
1658 | by the Intel Sandy Bridge-EP reference BIOS as protected memory. | |
1659 | The kernel will offer these regions to the 'pmem' driver so | |
1660 | they can be used for persistent storage. | |
1661 | ||
1662 | Say Y if unsure. | |
1663 | ||
506f1d07 SR |
1664 | config HIGHPTE |
1665 | bool "Allocate 3rd-level pagetables from highmem" | |
6fc108a0 | 1666 | depends on HIGHMEM |
8f9ca475 | 1667 | ---help--- |
506f1d07 SR |
1668 | The VM uses one page table entry for each page of physical memory. |
1669 | For systems with a lot of RAM, this can be wasteful of precious | |
1670 | low memory. Setting this option will put user-space page table | |
1671 | entries in high memory. | |
1672 | ||
9f077871 | 1673 | config X86_CHECK_BIOS_CORRUPTION |
8f9ca475 IM |
1674 | bool "Check for low memory corruption" |
1675 | ---help--- | |
1676 | Periodically check for memory corruption in low memory, which | |
1677 | is suspected to be caused by BIOS. Even when enabled in the | |
1678 | configuration, it is disabled at runtime. Enable it by | |
1679 | setting "memory_corruption_check=1" on the kernel command | |
1680 | line. By default it scans the low 64k of memory every 60 | |
1681 | seconds; see the memory_corruption_check_size and | |
1682 | memory_corruption_check_period parameters in | |
8c27ceff | 1683 | Documentation/admin-guide/kernel-parameters.rst to adjust this. |
8f9ca475 IM |
1684 | |
1685 | When enabled with the default parameters, this option has | |
1686 | almost no overhead, as it reserves a relatively small amount | |
1687 | of memory and scans it infrequently. It both detects corruption | |
1688 | and prevents it from affecting the running system. | |
1689 | ||
1690 | It is, however, intended as a diagnostic tool; if repeatable | |
1691 | BIOS-originated corruption always affects the same memory, | |
1692 | you can use memmap= to prevent the kernel from using that | |
1693 | memory. | |
9f077871 | 1694 | |
c885df50 | 1695 | config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK |
8f9ca475 | 1696 | bool "Set the default setting of memory_corruption_check" |
c885df50 JF |
1697 | depends on X86_CHECK_BIOS_CORRUPTION |
1698 | default y | |
8f9ca475 IM |
1699 | ---help--- |
1700 | Set whether the default state of memory_corruption_check is | |
1701 | on or off. | |
c885df50 | 1702 | |
9ea77bdb | 1703 | config X86_RESERVE_LOW |
d0cd7425 PA |
1704 | int "Amount of low memory, in kilobytes, to reserve for the BIOS" |
1705 | default 64 | |
1706 | range 4 640 | |
8f9ca475 | 1707 | ---help--- |
d0cd7425 PA |
1708 | Specify the amount of low memory to reserve for the BIOS. |
1709 | ||
1710 | The first page contains BIOS data structures that the kernel | |
1711 | must not use, so that page must always be reserved. | |
1712 | ||
1713 | By default we reserve the first 64K of physical RAM, as a | |
1714 | number of BIOSes are known to corrupt that memory range | |
1715 | during events such as suspend/resume or monitor cable | |
1716 | insertion, so it must not be used by the kernel. | |
fc381519 | 1717 | |
d0cd7425 PA |
1718 | You can set this to 4 if you are absolutely sure that you |
1719 | trust the BIOS to get all its memory reservations and usages | |
1720 | right. If you know your BIOS have problems beyond the | |
1721 | default 64K area, you can set this to 640 to avoid using the | |
1722 | entire low memory range. | |
fc381519 | 1723 | |
d0cd7425 PA |
1724 | If you have doubts about the BIOS (e.g. suspend/resume does |
1725 | not work or there's kernel crashes after certain hardware | |
1726 | hotplug events) then you might want to enable | |
1727 | X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check | |
1728 | typical corruption patterns. | |
fc381519 | 1729 | |
d0cd7425 | 1730 | Leave this to the default value of 64 if you are unsure. |
fc381519 | 1731 | |
506f1d07 SR |
1732 | config MATH_EMULATION |
1733 | bool | |
a5b9e5a2 | 1734 | depends on MODIFY_LDT_SYSCALL |
506f1d07 SR |
1735 | prompt "Math emulation" if X86_32 |
1736 | ---help--- | |
1737 | Linux can emulate a math coprocessor (used for floating point | |
1738 | operations) if you don't have one. 486DX and Pentium processors have | |
1739 | a math coprocessor built in, 486SX and 386 do not, unless you added | |
1740 | a 487DX or 387, respectively. (The messages during boot time can | |
1741 | give you some hints here ["man dmesg"].) Everyone needs either a | |
1742 | coprocessor or this emulation. | |
1743 | ||
1744 | If you don't have a math coprocessor, you need to say Y here; if you | |
1745 | say Y here even though you have a coprocessor, the coprocessor will | |
1746 | be used nevertheless. (This behavior can be changed with the kernel | |
1747 | command line option "no387", which comes handy if your coprocessor | |
1748 | is broken. Try "man bootparam" or see the documentation of your boot | |
1749 | loader (lilo or loadlin) about how to pass options to the kernel at | |
1750 | boot time.) This means that it is a good idea to say Y here if you | |
1751 | intend to use this kernel on different machines. | |
1752 | ||
1753 | More information about the internals of the Linux math coprocessor | |
1754 | emulation can be found in <file:arch/x86/math-emu/README>. | |
1755 | ||
1756 | If you are not sure, say Y; apart from resulting in a 66 KB bigger | |
1757 | kernel, it won't hurt. | |
1758 | ||
1759 | config MTRR | |
6fc108a0 | 1760 | def_bool y |
6a108a14 | 1761 | prompt "MTRR (Memory Type Range Register) support" if EXPERT |
506f1d07 SR |
1762 | ---help--- |
1763 | On Intel P6 family processors (Pentium Pro, Pentium II and later) | |
1764 | the Memory Type Range Registers (MTRRs) may be used to control | |
1765 | processor access to memory ranges. This is most useful if you have | |
1766 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining | |
1767 | allows bus write transfers to be combined into a larger transfer | |
1768 | before bursting over the PCI/AGP bus. This can increase performance | |
1769 | of image write operations 2.5 times or more. Saying Y here creates a | |
1770 | /proc/mtrr file which may be used to manipulate your processor's | |
1771 | MTRRs. Typically the X server should use this. | |
1772 | ||
1773 | This code has a reasonably generic interface so that similar | |
1774 | control registers on other processors can be easily supported | |
1775 | as well: | |
1776 | ||
1777 | The Cyrix 6x86, 6x86MX and M II processors have Address Range | |
1778 | Registers (ARRs) which provide a similar functionality to MTRRs. For | |
1779 | these, the ARRs are used to emulate the MTRRs. | |
1780 | The AMD K6-2 (stepping 8 and above) and K6-3 processors have two | |
1781 | MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing | |
1782 | write-combining. All of these processors are supported by this code | |
1783 | and it makes sense to say Y here if you have one of them. | |
1784 | ||
1785 | Saying Y here also fixes a problem with buggy SMP BIOSes which only | |
1786 | set the MTRRs for the boot CPU and not for the secondary CPUs. This | |
1787 | can lead to all sorts of problems, so it's good to say Y here. | |
1788 | ||
1789 | You can safely say Y even if your machine doesn't have MTRRs, you'll | |
1790 | just add about 9 KB to your kernel. | |
1791 | ||
7225e751 | 1792 | See <file:Documentation/x86/mtrr.txt> for more information. |
506f1d07 | 1793 | |
95ffa243 | 1794 | config MTRR_SANITIZER |
2ffb3501 | 1795 | def_bool y |
95ffa243 YL |
1796 | prompt "MTRR cleanup support" |
1797 | depends on MTRR | |
8f9ca475 | 1798 | ---help--- |
aba3728c TG |
1799 | Convert MTRR layout from continuous to discrete, so X drivers can |
1800 | add writeback entries. | |
95ffa243 | 1801 | |
aba3728c | 1802 | Can be disabled with disable_mtrr_cleanup on the kernel command line. |
692105b8 | 1803 | The largest mtrr entry size for a continuous block can be set with |
aba3728c | 1804 | mtrr_chunk_size. |
95ffa243 | 1805 | |
2ffb3501 | 1806 | If unsure, say Y. |
95ffa243 YL |
1807 | |
1808 | config MTRR_SANITIZER_ENABLE_DEFAULT | |
f5098d62 YL |
1809 | int "MTRR cleanup enable value (0-1)" |
1810 | range 0 1 | |
1811 | default "0" | |
95ffa243 | 1812 | depends on MTRR_SANITIZER |
8f9ca475 | 1813 | ---help--- |
f5098d62 | 1814 | Enable mtrr cleanup default value |
95ffa243 | 1815 | |
12031a62 YL |
1816 | config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT |
1817 | int "MTRR cleanup spare reg num (0-7)" | |
1818 | range 0 7 | |
1819 | default "1" | |
1820 | depends on MTRR_SANITIZER | |
8f9ca475 | 1821 | ---help--- |
12031a62 | 1822 | mtrr cleanup spare entries default, it can be changed via |
aba3728c | 1823 | mtrr_spare_reg_nr=N on the kernel command line. |
12031a62 | 1824 | |
2e5d9c85 | 1825 | config X86_PAT |
6fc108a0 | 1826 | def_bool y |
6a108a14 | 1827 | prompt "x86 PAT support" if EXPERT |
2a8a2719 | 1828 | depends on MTRR |
8f9ca475 | 1829 | ---help--- |
2e5d9c85 | 1830 | Use PAT attributes to setup page level cache control. |
042b78e4 | 1831 | |
2e5d9c85 | 1832 | PATs are the modern equivalents of MTRRs and are much more |
1833 | flexible than MTRRs. | |
1834 | ||
1835 | Say N here if you see bootup problems (boot crash, boot hang, | |
042b78e4 | 1836 | spontaneous reboots) or a non-working video driver. |
2e5d9c85 | 1837 | |
1838 | If unsure, say Y. | |
1839 | ||
46cf98cd VP |
1840 | config ARCH_USES_PG_UNCACHED |
1841 | def_bool y | |
1842 | depends on X86_PAT | |
1843 | ||
628c6246 PA |
1844 | config ARCH_RANDOM |
1845 | def_bool y | |
1846 | prompt "x86 architectural random number generator" if EXPERT | |
1847 | ---help--- | |
1848 | Enable the x86 architectural RDRAND instruction | |
1849 | (Intel Bull Mountain technology) to generate random numbers. | |
1850 | If supported, this is a high bandwidth, cryptographically | |
1851 | secure hardware random number generator. | |
1852 | ||
51ae4a2d PA |
1853 | config X86_SMAP |
1854 | def_bool y | |
1855 | prompt "Supervisor Mode Access Prevention" if EXPERT | |
1856 | ---help--- | |
1857 | Supervisor Mode Access Prevention (SMAP) is a security | |
1858 | feature in newer Intel processors. There is a small | |
1859 | performance cost if this enabled and turned on; there is | |
1860 | also a small increase in the kernel size if this is enabled. | |
1861 | ||
1862 | If unsure, say Y. | |
1863 | ||
aa35f896 | 1864 | config X86_INTEL_UMIP |
796ebc81 | 1865 | def_bool y |
aa35f896 RN |
1866 | depends on CPU_SUP_INTEL |
1867 | prompt "Intel User Mode Instruction Prevention" if EXPERT | |
1868 | ---help--- | |
1869 | The User Mode Instruction Prevention (UMIP) is a security | |
1870 | feature in newer Intel processors. If enabled, a general | |
796ebc81 RN |
1871 | protection fault is issued if the SGDT, SLDT, SIDT, SMSW |
1872 | or STR instructions are executed in user mode. These instructions | |
1873 | unnecessarily expose information about the hardware state. | |
1874 | ||
1875 | The vast majority of applications do not use these instructions. | |
1876 | For the very few that do, software emulation is provided in | |
1877 | specific cases in protected and virtual-8086 modes. Emulated | |
1878 | results are dummy. | |
aa35f896 | 1879 | |
72e9b5fe DH |
1880 | config X86_INTEL_MPX |
1881 | prompt "Intel MPX (Memory Protection Extensions)" | |
1882 | def_bool n | |
df3735c5 RR |
1883 | # Note: only available in 64-bit mode due to VMA flags shortage |
1884 | depends on CPU_SUP_INTEL && X86_64 | |
1885 | select ARCH_USES_HIGH_VMA_FLAGS | |
72e9b5fe DH |
1886 | ---help--- |
1887 | MPX provides hardware features that can be used in | |
1888 | conjunction with compiler-instrumented code to check | |
1889 | memory references. It is designed to detect buffer | |
1890 | overflow or underflow bugs. | |
1891 | ||
1892 | This option enables running applications which are | |
1893 | instrumented or otherwise use MPX. It does not use MPX | |
1894 | itself inside the kernel or to protect the kernel | |
1895 | against bad memory references. | |
1896 | ||
1897 | Enabling this option will make the kernel larger: | |
1898 | ~8k of kernel text and 36 bytes of data on a 64-bit | |
1899 | defconfig. It adds a long to the 'mm_struct' which | |
1900 | will increase the kernel memory overhead of each | |
1901 | process and adds some branches to paths used during | |
1902 | exec() and munmap(). | |
1903 | ||
1904 | For details, see Documentation/x86/intel_mpx.txt | |
1905 | ||
1906 | If unsure, say N. | |
1907 | ||
35e97790 | 1908 | config X86_INTEL_MEMORY_PROTECTION_KEYS |
284244a9 | 1909 | prompt "Intel Memory Protection Keys" |
35e97790 | 1910 | def_bool y |
284244a9 | 1911 | # Note: only available in 64-bit mode |
35e97790 | 1912 | depends on CPU_SUP_INTEL && X86_64 |
52c8e601 IM |
1913 | select ARCH_USES_HIGH_VMA_FLAGS |
1914 | select ARCH_HAS_PKEYS | |
284244a9 DH |
1915 | ---help--- |
1916 | Memory Protection Keys provides a mechanism for enforcing | |
1917 | page-based protections, but without requiring modification of the | |
1918 | page tables when an application changes protection domains. | |
1919 | ||
1920 | For details, see Documentation/x86/protection-keys.txt | |
1921 | ||
1922 | If unsure, say y. | |
35e97790 | 1923 | |
506f1d07 | 1924 | config EFI |
9ba16087 | 1925 | bool "EFI runtime service support" |
5b83683f | 1926 | depends on ACPI |
f6ce5002 | 1927 | select UCS2_STRING |
022ee6c5 | 1928 | select EFI_RUNTIME_WRAPPERS |
506f1d07 | 1929 | ---help--- |
8f9ca475 IM |
1930 | This enables the kernel to use EFI runtime services that are |
1931 | available (such as the EFI variable services). | |
506f1d07 | 1932 | |
8f9ca475 IM |
1933 | This option is only useful on systems that have EFI firmware. |
1934 | In addition, you should use the latest ELILO loader available | |
1935 | at <http://elilo.sourceforge.net> in order to take advantage | |
1936 | of EFI runtime services. However, even with this option, the | |
1937 | resultant kernel should continue to boot on existing non-EFI | |
1938 | platforms. | |
506f1d07 | 1939 | |
291f3632 MF |
1940 | config EFI_STUB |
1941 | bool "EFI stub support" | |
b16d8c23 | 1942 | depends on EFI && !X86_USE_3DNOW |
7b2a583a | 1943 | select RELOCATABLE |
291f3632 MF |
1944 | ---help--- |
1945 | This kernel feature allows a bzImage to be loaded directly | |
1946 | by EFI firmware without the use of a bootloader. | |
1947 | ||
4172fe2f | 1948 | See Documentation/efi-stub.txt for more information. |
0c759662 | 1949 | |
7d453eee MF |
1950 | config EFI_MIXED |
1951 | bool "EFI mixed-mode support" | |
1952 | depends on EFI_STUB && X86_64 | |
1953 | ---help--- | |
1954 | Enabling this feature allows a 64-bit kernel to be booted | |
1955 | on a 32-bit firmware, provided that your CPU supports 64-bit | |
1956 | mode. | |
1957 | ||
1958 | Note that it is not possible to boot a mixed-mode enabled | |
1959 | kernel via the EFI boot stub - a bootloader that supports | |
1960 | the EFI handover protocol must be used. | |
1961 | ||
1962 | If unsure, say N. | |
1963 | ||
506f1d07 | 1964 | config SECCOMP |
3c2362e6 HH |
1965 | def_bool y |
1966 | prompt "Enable seccomp to safely compute untrusted bytecode" | |
8f9ca475 | 1967 | ---help--- |
506f1d07 SR |
1968 | This kernel feature is useful for number crunching applications |
1969 | that may need to compute untrusted bytecode during their | |
1970 | execution. By using pipes or other transports made available to | |
1971 | the process as file descriptors supporting the read/write | |
1972 | syscalls, it's possible to isolate those applications in | |
1973 | their own address space using seccomp. Once seccomp is | |
9c0bbee8 | 1974 | enabled via prctl(PR_SET_SECCOMP), it cannot be disabled |
506f1d07 SR |
1975 | and the task is only allowed to execute a few safe syscalls |
1976 | defined by each seccomp mode. | |
1977 | ||
1978 | If unsure, say Y. Only embedded should say N here. | |
1979 | ||
8636a1f9 | 1980 | source "kernel/Kconfig.hz" |
506f1d07 SR |
1981 | |
1982 | config KEXEC | |
1983 | bool "kexec system call" | |
2965faa5 | 1984 | select KEXEC_CORE |
8f9ca475 | 1985 | ---help--- |
506f1d07 SR |
1986 | kexec is a system call that implements the ability to shutdown your |
1987 | current kernel, and to start another kernel. It is like a reboot | |
1988 | but it is independent of the system firmware. And like a reboot | |
1989 | you can start any kernel with it, not just Linux. | |
1990 | ||
1991 | The name comes from the similarity to the exec system call. | |
1992 | ||
1993 | It is an ongoing process to be certain the hardware in a machine | |
1994 | is properly shutdown, so do not be surprised if this code does not | |
bf220695 GU |
1995 | initially work for you. As of this writing the exact hardware |
1996 | interface is strongly in flux, so no good recommendation can be | |
1997 | made. | |
506f1d07 | 1998 | |
74ca317c VG |
1999 | config KEXEC_FILE |
2000 | bool "kexec file based system call" | |
2965faa5 | 2001 | select KEXEC_CORE |
74ca317c | 2002 | select BUILD_BIN2C |
74ca317c VG |
2003 | depends on X86_64 |
2004 | depends on CRYPTO=y | |
2005 | depends on CRYPTO_SHA256=y | |
2006 | ---help--- | |
2007 | This is new version of kexec system call. This system call is | |
2008 | file based and takes file descriptors as system call argument | |
2009 | for kernel and initramfs as opposed to list of segments as | |
2010 | accepted by previous system call. | |
2011 | ||
b799a09f AT |
2012 | config ARCH_HAS_KEXEC_PURGATORY |
2013 | def_bool KEXEC_FILE | |
2014 | ||
8e7d8381 VG |
2015 | config KEXEC_VERIFY_SIG |
2016 | bool "Verify kernel signature during kexec_file_load() syscall" | |
74ca317c | 2017 | depends on KEXEC_FILE |
8e7d8381 VG |
2018 | ---help--- |
2019 | This option makes kernel signature verification mandatory for | |
d8eb8940 BP |
2020 | the kexec_file_load() syscall. |
2021 | ||
2022 | In addition to that option, you need to enable signature | |
2023 | verification for the corresponding kernel image type being | |
2024 | loaded in order for this to work. | |
8e7d8381 VG |
2025 | |
2026 | config KEXEC_BZIMAGE_VERIFY_SIG | |
2027 | bool "Enable bzImage signature verification support" | |
2028 | depends on KEXEC_VERIFY_SIG | |
2029 | depends on SIGNED_PE_FILE_VERIFICATION | |
2030 | select SYSTEM_TRUSTED_KEYRING | |
2031 | ---help--- | |
2032 | Enable bzImage signature verification support. | |
2033 | ||
506f1d07 | 2034 | config CRASH_DUMP |
04b69447 | 2035 | bool "kernel crash dumps" |
506f1d07 | 2036 | depends on X86_64 || (X86_32 && HIGHMEM) |
8f9ca475 | 2037 | ---help--- |
506f1d07 SR |
2038 | Generate crash dump after being started by kexec. |
2039 | This should be normally only set in special crash dump kernels | |
2040 | which are loaded in the main kernel with kexec-tools into | |
2041 | a specially reserved region and then later executed after | |
2042 | a crash by kdump/kexec. The crash dump kernel must be compiled | |
2043 | to a memory address not used by the main kernel or BIOS using | |
2044 | PHYSICAL_START, or it must be built as a relocatable image | |
2045 | (CONFIG_RELOCATABLE=y). | |
2046 | For more details see Documentation/kdump/kdump.txt | |
2047 | ||
3ab83521 | 2048 | config KEXEC_JUMP |
6ea30386 | 2049 | bool "kexec jump" |
fee7b0d8 | 2050 | depends on KEXEC && HIBERNATION |
8f9ca475 | 2051 | ---help--- |
89081d17 HY |
2052 | Jump between original kernel and kexeced kernel and invoke |
2053 | code in physical address mode via KEXEC | |
3ab83521 | 2054 | |
506f1d07 | 2055 | config PHYSICAL_START |
6a108a14 | 2056 | hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP) |
ceefccc9 | 2057 | default "0x1000000" |
8f9ca475 | 2058 | ---help--- |
506f1d07 SR |
2059 | This gives the physical address where the kernel is loaded. |
2060 | ||
2061 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then | |
2062 | bzImage will decompress itself to above physical address and | |
2063 | run from there. Otherwise, bzImage will run from the address where | |
2064 | it has been loaded by the boot loader and will ignore above physical | |
2065 | address. | |
2066 | ||
2067 | In normal kdump cases one does not have to set/change this option | |
2068 | as now bzImage can be compiled as a completely relocatable image | |
2069 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different | |
2070 | address. This option is mainly useful for the folks who don't want | |
2071 | to use a bzImage for capturing the crash dump and want to use a | |
2072 | vmlinux instead. vmlinux is not relocatable hence a kernel needs | |
2073 | to be specifically compiled to run from a specific memory area | |
2074 | (normally a reserved region) and this option comes handy. | |
2075 | ||
ceefccc9 PA |
2076 | So if you are using bzImage for capturing the crash dump, |
2077 | leave the value here unchanged to 0x1000000 and set | |
2078 | CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux | |
2079 | for capturing the crash dump change this value to start of | |
2080 | the reserved region. In other words, it can be set based on | |
2081 | the "X" value as specified in the "crashkernel=YM@XM" | |
2082 | command line boot parameter passed to the panic-ed | |
2083 | kernel. Please take a look at Documentation/kdump/kdump.txt | |
2084 | for more details about crash dumps. | |
506f1d07 SR |
2085 | |
2086 | Usage of bzImage for capturing the crash dump is recommended as | |
2087 | one does not have to build two kernels. Same kernel can be used | |
2088 | as production kernel and capture kernel. Above option should have | |
2089 | gone away after relocatable bzImage support is introduced. But it | |
2090 | is present because there are users out there who continue to use | |
2091 | vmlinux for dump capture. This option should go away down the | |
2092 | line. | |
2093 | ||
2094 | Don't change this unless you know what you are doing. | |
2095 | ||
2096 | config RELOCATABLE | |
26717808 PA |
2097 | bool "Build a relocatable kernel" |
2098 | default y | |
8f9ca475 | 2099 | ---help--- |
506f1d07 SR |
2100 | This builds a kernel image that retains relocation information |
2101 | so it can be loaded someplace besides the default 1MB. | |
2102 | The relocations tend to make the kernel binary about 10% larger, | |
2103 | but are discarded at runtime. | |
2104 | ||
2105 | One use is for the kexec on panic case where the recovery kernel | |
2106 | must live at a different physical address than the primary | |
2107 | kernel. | |
2108 | ||
2109 | Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address | |
2110 | it has been loaded at and the compile time physical address | |
8ab3820f | 2111 | (CONFIG_PHYSICAL_START) is used as the minimum location. |
506f1d07 | 2112 | |
8ab3820f | 2113 | config RANDOMIZE_BASE |
e8581e3d | 2114 | bool "Randomize the address of the kernel image (KASLR)" |
8ab3820f | 2115 | depends on RELOCATABLE |
6807c846 | 2116 | default y |
8ab3820f | 2117 | ---help--- |
e8581e3d BH |
2118 | In support of Kernel Address Space Layout Randomization (KASLR), |
2119 | this randomizes the physical address at which the kernel image | |
2120 | is decompressed and the virtual address where the kernel | |
2121 | image is mapped, as a security feature that deters exploit | |
2122 | attempts relying on knowledge of the location of kernel | |
2123 | code internals. | |
2124 | ||
ed9f007e KC |
2125 | On 64-bit, the kernel physical and virtual addresses are |
2126 | randomized separately. The physical address will be anywhere | |
2127 | between 16MB and the top of physical memory (up to 64TB). The | |
2128 | virtual address will be randomized from 16MB up to 1GB (9 bits | |
2129 | of entropy). Note that this also reduces the memory space | |
2130 | available to kernel modules from 1.5GB to 1GB. | |
2131 | ||
2132 | On 32-bit, the kernel physical and virtual addresses are | |
2133 | randomized together. They will be randomized from 16MB up to | |
2134 | 512MB (8 bits of entropy). | |
e8581e3d BH |
2135 | |
2136 | Entropy is generated using the RDRAND instruction if it is | |
2137 | supported. If RDTSC is supported, its value is mixed into | |
2138 | the entropy pool as well. If neither RDRAND nor RDTSC are | |
ed9f007e KC |
2139 | supported, then entropy is read from the i8254 timer. The |
2140 | usable entropy is limited by the kernel being built using | |
2141 | 2GB addressing, and that PHYSICAL_ALIGN must be at a | |
2142 | minimum of 2MB. As a result, only 10 bits of entropy are | |
2143 | theoretically possible, but the implementations are further | |
2144 | limited due to memory layouts. | |
e8581e3d | 2145 | |
6807c846 | 2146 | If unsure, say Y. |
8ab3820f KC |
2147 | |
2148 | # Relocation on x86 needs some additional build support | |
845adf72 PA |
2149 | config X86_NEED_RELOCS |
2150 | def_bool y | |
8ab3820f | 2151 | depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE) |
845adf72 | 2152 | |
506f1d07 | 2153 | config PHYSICAL_ALIGN |
a0215061 | 2154 | hex "Alignment value to which kernel should be aligned" |
8ab3820f | 2155 | default "0x200000" |
a0215061 KC |
2156 | range 0x2000 0x1000000 if X86_32 |
2157 | range 0x200000 0x1000000 if X86_64 | |
8f9ca475 | 2158 | ---help--- |
506f1d07 SR |
2159 | This value puts the alignment restrictions on physical address |
2160 | where kernel is loaded and run from. Kernel is compiled for an | |
2161 | address which meets above alignment restriction. | |
2162 | ||
2163 | If bootloader loads the kernel at a non-aligned address and | |
2164 | CONFIG_RELOCATABLE is set, kernel will move itself to nearest | |
2165 | address aligned to above value and run from there. | |
2166 | ||
2167 | If bootloader loads the kernel at a non-aligned address and | |
2168 | CONFIG_RELOCATABLE is not set, kernel will ignore the run time | |
2169 | load address and decompress itself to the address it has been | |
2170 | compiled for and run from there. The address for which kernel is | |
2171 | compiled already meets above alignment restrictions. Hence the | |
2172 | end result is that kernel runs from a physical address meeting | |
2173 | above alignment restrictions. | |
2174 | ||
a0215061 KC |
2175 | On 32-bit this value must be a multiple of 0x2000. On 64-bit |
2176 | this value must be a multiple of 0x200000. | |
2177 | ||
506f1d07 SR |
2178 | Don't change this unless you know what you are doing. |
2179 | ||
eedb92ab KS |
2180 | config DYNAMIC_MEMORY_LAYOUT |
2181 | bool | |
2182 | ---help--- | |
2183 | This option makes base addresses of vmalloc and vmemmap as well as | |
2184 | __PAGE_OFFSET movable during boot. | |
2185 | ||
0483e1fa TG |
2186 | config RANDOMIZE_MEMORY |
2187 | bool "Randomize the kernel memory sections" | |
2188 | depends on X86_64 | |
2189 | depends on RANDOMIZE_BASE | |
eedb92ab | 2190 | select DYNAMIC_MEMORY_LAYOUT |
0483e1fa TG |
2191 | default RANDOMIZE_BASE |
2192 | ---help--- | |
2193 | Randomizes the base virtual address of kernel memory sections | |
2194 | (physical memory mapping, vmalloc & vmemmap). This security feature | |
2195 | makes exploits relying on predictable memory locations less reliable. | |
2196 | ||
2197 | The order of allocations remains unchanged. Entropy is generated in | |
2198 | the same way as RANDOMIZE_BASE. Current implementation in the optimal | |
2199 | configuration have in average 30,000 different possible virtual | |
2200 | addresses for each memory section. | |
2201 | ||
6807c846 | 2202 | If unsure, say Y. |
0483e1fa | 2203 | |
90397a41 TG |
2204 | config RANDOMIZE_MEMORY_PHYSICAL_PADDING |
2205 | hex "Physical memory mapping padding" if EXPERT | |
2206 | depends on RANDOMIZE_MEMORY | |
2207 | default "0xa" if MEMORY_HOTPLUG | |
2208 | default "0x0" | |
2209 | range 0x1 0x40 if MEMORY_HOTPLUG | |
2210 | range 0x0 0x40 | |
2211 | ---help--- | |
2212 | Define the padding in terabytes added to the existing physical | |
2213 | memory size during kernel memory randomization. It is useful | |
2214 | for memory hotplug support but reduces the entropy available for | |
2215 | address randomization. | |
2216 | ||
2217 | If unsure, leave at the default value. | |
2218 | ||
506f1d07 | 2219 | config HOTPLUG_CPU |
bebd024e | 2220 | def_bool y |
40b31360 | 2221 | depends on SMP |
506f1d07 | 2222 | |
80aa1dff FY |
2223 | config BOOTPARAM_HOTPLUG_CPU0 |
2224 | bool "Set default setting of cpu0_hotpluggable" | |
2c922cd0 | 2225 | depends on HOTPLUG_CPU |
80aa1dff FY |
2226 | ---help--- |
2227 | Set whether default state of cpu0_hotpluggable is on or off. | |
2228 | ||
2229 | Say Y here to enable CPU0 hotplug by default. If this switch | |
2230 | is turned on, there is no need to give cpu0_hotplug kernel | |
2231 | parameter and the CPU0 hotplug feature is enabled by default. | |
2232 | ||
2233 | Please note: there are two known CPU0 dependencies if you want | |
2234 | to enable the CPU0 hotplug feature either by this switch or by | |
2235 | cpu0_hotplug kernel parameter. | |
2236 | ||
2237 | First, resume from hibernate or suspend always starts from CPU0. | |
2238 | So hibernate and suspend are prevented if CPU0 is offline. | |
2239 | ||
2240 | Second dependency is PIC interrupts always go to CPU0. CPU0 can not | |
2241 | offline if any interrupt can not migrate out of CPU0. There may | |
2242 | be other CPU0 dependencies. | |
2243 | ||
2244 | Please make sure the dependencies are under your control before | |
2245 | you enable this feature. | |
2246 | ||
2247 | Say N if you don't want to enable CPU0 hotplug feature by default. | |
2248 | You still can enable the CPU0 hotplug feature at boot by kernel | |
2249 | parameter cpu0_hotplug. | |
2250 | ||
a71c8bc5 FY |
2251 | config DEBUG_HOTPLUG_CPU0 |
2252 | def_bool n | |
2253 | prompt "Debug CPU0 hotplug" | |
2c922cd0 | 2254 | depends on HOTPLUG_CPU |
a71c8bc5 FY |
2255 | ---help--- |
2256 | Enabling this option offlines CPU0 (if CPU0 can be offlined) as | |
2257 | soon as possible and boots up userspace with CPU0 offlined. User | |
2258 | can online CPU0 back after boot time. | |
2259 | ||
2260 | To debug CPU0 hotplug, you need to enable CPU0 offline/online | |
2261 | feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during | |
2262 | compilation or giving cpu0_hotplug kernel parameter at boot. | |
2263 | ||
2264 | If unsure, say N. | |
2265 | ||
506f1d07 | 2266 | config COMPAT_VDSO |
b0b49f26 AL |
2267 | def_bool n |
2268 | prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)" | |
953fee1d | 2269 | depends on COMPAT_32 |
8f9ca475 | 2270 | ---help--- |
b0b49f26 AL |
2271 | Certain buggy versions of glibc will crash if they are |
2272 | presented with a 32-bit vDSO that is not mapped at the address | |
2273 | indicated in its segment table. | |
e84446de | 2274 | |
b0b49f26 AL |
2275 | The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a |
2276 | and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and | |
2277 | 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is | |
2278 | the only released version with the bug, but OpenSUSE 9 | |
2279 | contains a buggy "glibc 2.3.2". | |
506f1d07 | 2280 | |
b0b49f26 AL |
2281 | The symptom of the bug is that everything crashes on startup, saying: |
2282 | dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed! | |
2283 | ||
2284 | Saying Y here changes the default value of the vdso32 boot | |
2285 | option from 1 to 0, which turns off the 32-bit vDSO entirely. | |
2286 | This works around the glibc bug but hurts performance. | |
2287 | ||
2288 | If unsure, say N: if you are compiling your own kernel, you | |
2289 | are unlikely to be using a buggy version of glibc. | |
506f1d07 | 2290 | |
3dc33bd3 KC |
2291 | choice |
2292 | prompt "vsyscall table for legacy applications" | |
2293 | depends on X86_64 | |
2294 | default LEGACY_VSYSCALL_EMULATE | |
2295 | help | |
2296 | Legacy user code that does not know how to find the vDSO expects | |
2297 | to be able to issue three syscalls by calling fixed addresses in | |
2298 | kernel space. Since this location is not randomized with ASLR, | |
2299 | it can be used to assist security vulnerability exploitation. | |
2300 | ||
2301 | This setting can be changed at boot time via the kernel command | |
076ca272 | 2302 | line parameter vsyscall=[emulate|none]. |
3dc33bd3 KC |
2303 | |
2304 | On a system with recent enough glibc (2.14 or newer) and no | |
2305 | static binaries, you can say None without a performance penalty | |
2306 | to improve security. | |
2307 | ||
2308 | If unsure, select "Emulate". | |
2309 | ||
3dc33bd3 KC |
2310 | config LEGACY_VSYSCALL_EMULATE |
2311 | bool "Emulate" | |
2312 | help | |
2313 | The kernel traps and emulates calls into the fixed | |
2314 | vsyscall address mapping. This makes the mapping | |
2315 | non-executable, but it still contains known contents, | |
2316 | which could be used in certain rare security vulnerability | |
2317 | exploits. This configuration is recommended when userspace | |
2318 | still uses the vsyscall area. | |
2319 | ||
2320 | config LEGACY_VSYSCALL_NONE | |
2321 | bool "None" | |
2322 | help | |
2323 | There will be no vsyscall mapping at all. This will | |
2324 | eliminate any risk of ASLR bypass due to the vsyscall | |
2325 | fixed address mapping. Attempts to use the vsyscalls | |
2326 | will be reported to dmesg, so that either old or | |
2327 | malicious userspace programs can be identified. | |
2328 | ||
2329 | endchoice | |
2330 | ||
516cbf37 TB |
2331 | config CMDLINE_BOOL |
2332 | bool "Built-in kernel command line" | |
8f9ca475 | 2333 | ---help--- |
516cbf37 TB |
2334 | Allow for specifying boot arguments to the kernel at |
2335 | build time. On some systems (e.g. embedded ones), it is | |
2336 | necessary or convenient to provide some or all of the | |
2337 | kernel boot arguments with the kernel itself (that is, | |
2338 | to not rely on the boot loader to provide them.) | |
2339 | ||
2340 | To compile command line arguments into the kernel, | |
2341 | set this option to 'Y', then fill in the | |
69711ca1 | 2342 | boot arguments in CONFIG_CMDLINE. |
516cbf37 TB |
2343 | |
2344 | Systems with fully functional boot loaders (i.e. non-embedded) | |
2345 | should leave this option set to 'N'. | |
2346 | ||
2347 | config CMDLINE | |
2348 | string "Built-in kernel command string" | |
2349 | depends on CMDLINE_BOOL | |
2350 | default "" | |
8f9ca475 | 2351 | ---help--- |
516cbf37 TB |
2352 | Enter arguments here that should be compiled into the kernel |
2353 | image and used at boot time. If the boot loader provides a | |
2354 | command line at boot time, it is appended to this string to | |
2355 | form the full kernel command line, when the system boots. | |
2356 | ||
2357 | However, you can use the CONFIG_CMDLINE_OVERRIDE option to | |
2358 | change this behavior. | |
2359 | ||
2360 | In most cases, the command line (whether built-in or provided | |
2361 | by the boot loader) should specify the device for the root | |
2362 | file system. | |
2363 | ||
2364 | config CMDLINE_OVERRIDE | |
2365 | bool "Built-in command line overrides boot loader arguments" | |
516cbf37 | 2366 | depends on CMDLINE_BOOL |
8f9ca475 | 2367 | ---help--- |
516cbf37 TB |
2368 | Set this option to 'Y' to have the kernel ignore the boot loader |
2369 | command line, and use ONLY the built-in command line. | |
2370 | ||
2371 | This is used to work around broken boot loaders. This should | |
2372 | be set to 'N' under normal conditions. | |
2373 | ||
a5b9e5a2 AL |
2374 | config MODIFY_LDT_SYSCALL |
2375 | bool "Enable the LDT (local descriptor table)" if EXPERT | |
2376 | default y | |
2377 | ---help--- | |
2378 | Linux can allow user programs to install a per-process x86 | |
2379 | Local Descriptor Table (LDT) using the modify_ldt(2) system | |
2380 | call. This is required to run 16-bit or segmented code such as | |
2381 | DOSEMU or some Wine programs. It is also used by some very old | |
2382 | threading libraries. | |
2383 | ||
2384 | Enabling this feature adds a small amount of overhead to | |
2385 | context switches and increases the low-level kernel attack | |
2386 | surface. Disabling it removes the modify_ldt(2) system call. | |
2387 | ||
2388 | Saying 'N' here may make sense for embedded or server kernels. | |
2389 | ||
b700e7f0 SJ |
2390 | source "kernel/livepatch/Kconfig" |
2391 | ||
506f1d07 SR |
2392 | endmenu |
2393 | ||
3072e413 MH |
2394 | config ARCH_HAS_ADD_PAGES |
2395 | def_bool y | |
2396 | depends on X86_64 && ARCH_ENABLE_MEMORY_HOTPLUG | |
2397 | ||
506f1d07 SR |
2398 | config ARCH_ENABLE_MEMORY_HOTPLUG |
2399 | def_bool y | |
2400 | depends on X86_64 || (X86_32 && HIGHMEM) | |
2401 | ||
35551053 GH |
2402 | config ARCH_ENABLE_MEMORY_HOTREMOVE |
2403 | def_bool y | |
2404 | depends on MEMORY_HOTPLUG | |
2405 | ||
e534c7c5 | 2406 | config USE_PERCPU_NUMA_NODE_ID |
645a7919 | 2407 | def_bool y |
e534c7c5 LS |
2408 | depends on NUMA |
2409 | ||
9491846f KS |
2410 | config ARCH_ENABLE_SPLIT_PMD_PTLOCK |
2411 | def_bool y | |
2412 | depends on X86_64 || X86_PAE | |
2413 | ||
c177c81e NH |
2414 | config ARCH_ENABLE_HUGEPAGE_MIGRATION |
2415 | def_bool y | |
2416 | depends on X86_64 && HUGETLB_PAGE && MIGRATION | |
2417 | ||
9c670ea3 NH |
2418 | config ARCH_ENABLE_THP_MIGRATION |
2419 | def_bool y | |
2420 | depends on X86_64 && TRANSPARENT_HUGEPAGE | |
2421 | ||
da85f865 | 2422 | menu "Power management and ACPI options" |
e279b6c1 SR |
2423 | |
2424 | config ARCH_HIBERNATION_HEADER | |
3c2362e6 | 2425 | def_bool y |
44556530 | 2426 | depends on HIBERNATION |
e279b6c1 SR |
2427 | |
2428 | source "kernel/power/Kconfig" | |
2429 | ||
2430 | source "drivers/acpi/Kconfig" | |
2431 | ||
efafc8b2 FT |
2432 | source "drivers/sfi/Kconfig" |
2433 | ||
a6b68076 | 2434 | config X86_APM_BOOT |
6fc108a0 | 2435 | def_bool y |
282e5aab | 2436 | depends on APM |
a6b68076 | 2437 | |
e279b6c1 SR |
2438 | menuconfig APM |
2439 | tristate "APM (Advanced Power Management) BIOS support" | |
efefa6f6 | 2440 | depends on X86_32 && PM_SLEEP |
e279b6c1 SR |
2441 | ---help--- |
2442 | APM is a BIOS specification for saving power using several different | |
2443 | techniques. This is mostly useful for battery powered laptops with | |
2444 | APM compliant BIOSes. If you say Y here, the system time will be | |
2445 | reset after a RESUME operation, the /proc/apm device will provide | |
2446 | battery status information, and user-space programs will receive | |
2447 | notification of APM "events" (e.g. battery status change). | |
2448 | ||
2449 | If you select "Y" here, you can disable actual use of the APM | |
2450 | BIOS by passing the "apm=off" option to the kernel at boot time. | |
2451 | ||
2452 | Note that the APM support is almost completely disabled for | |
2453 | machines with more than one CPU. | |
2454 | ||
2455 | In order to use APM, you will need supporting software. For location | |
2dc98fd3 MW |
2456 | and more information, read <file:Documentation/power/apm-acpi.txt> |
2457 | and the Battery Powered Linux mini-HOWTO, available from | |
e279b6c1 SR |
2458 | <http://www.tldp.org/docs.html#howto>. |
2459 | ||
2460 | This driver does not spin down disk drives (see the hdparm(8) | |
2461 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
2462 | VESA-compliant "green" monitors. | |
2463 | ||
2464 | This driver does not support the TI 4000M TravelMate and the ACER | |
2465 | 486/DX4/75 because they don't have compliant BIOSes. Many "green" | |
2466 | desktop machines also don't have compliant BIOSes, and this driver | |
2467 | may cause those machines to panic during the boot phase. | |
2468 | ||
2469 | Generally, if you don't have a battery in your machine, there isn't | |
2470 | much point in using this driver and you should say N. If you get | |
2471 | random kernel OOPSes or reboots that don't seem to be related to | |
2472 | anything, try disabling/enabling this option (or disabling/enabling | |
2473 | APM in your BIOS). | |
2474 | ||
2475 | Some other things you should try when experiencing seemingly random, | |
2476 | "weird" problems: | |
2477 | ||
2478 | 1) make sure that you have enough swap space and that it is | |
2479 | enabled. | |
2480 | 2) pass the "no-hlt" option to the kernel | |
2481 | 3) switch on floating point emulation in the kernel and pass | |
2482 | the "no387" option to the kernel | |
2483 | 4) pass the "floppy=nodma" option to the kernel | |
2484 | 5) pass the "mem=4M" option to the kernel (thereby disabling | |
2485 | all but the first 4 MB of RAM) | |
2486 | 6) make sure that the CPU is not over clocked. | |
2487 | 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> | |
2488 | 8) disable the cache from your BIOS settings | |
2489 | 9) install a fan for the video card or exchange video RAM | |
2490 | 10) install a better fan for the CPU | |
2491 | 11) exchange RAM chips | |
2492 | 12) exchange the motherboard. | |
2493 | ||
2494 | To compile this driver as a module, choose M here: the | |
2495 | module will be called apm. | |
2496 | ||
2497 | if APM | |
2498 | ||
2499 | config APM_IGNORE_USER_SUSPEND | |
2500 | bool "Ignore USER SUSPEND" | |
8f9ca475 | 2501 | ---help--- |
e279b6c1 SR |
2502 | This option will ignore USER SUSPEND requests. On machines with a |
2503 | compliant APM BIOS, you want to say N. However, on the NEC Versa M | |
2504 | series notebooks, it is necessary to say Y because of a BIOS bug. | |
2505 | ||
2506 | config APM_DO_ENABLE | |
2507 | bool "Enable PM at boot time" | |
2508 | ---help--- | |
2509 | Enable APM features at boot time. From page 36 of the APM BIOS | |
2510 | specification: "When disabled, the APM BIOS does not automatically | |
2511 | power manage devices, enter the Standby State, enter the Suspend | |
2512 | State, or take power saving steps in response to CPU Idle calls." | |
2513 | This driver will make CPU Idle calls when Linux is idle (unless this | |
2514 | feature is turned off -- see "Do CPU IDLE calls", below). This | |
2515 | should always save battery power, but more complicated APM features | |
2516 | will be dependent on your BIOS implementation. You may need to turn | |
2517 | this option off if your computer hangs at boot time when using APM | |
2518 | support, or if it beeps continuously instead of suspending. Turn | |
2519 | this off if you have a NEC UltraLite Versa 33/C or a Toshiba | |
2520 | T400CDT. This is off by default since most machines do fine without | |
2521 | this feature. | |
2522 | ||
2523 | config APM_CPU_IDLE | |
dd8af076 | 2524 | depends on CPU_IDLE |
e279b6c1 | 2525 | bool "Make CPU Idle calls when idle" |
8f9ca475 | 2526 | ---help--- |
e279b6c1 SR |
2527 | Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. |
2528 | On some machines, this can activate improved power savings, such as | |
2529 | a slowed CPU clock rate, when the machine is idle. These idle calls | |
2530 | are made after the idle loop has run for some length of time (e.g., | |
2531 | 333 mS). On some machines, this will cause a hang at boot time or | |
2532 | whenever the CPU becomes idle. (On machines with more than one CPU, | |
2533 | this option does nothing.) | |
2534 | ||
2535 | config APM_DISPLAY_BLANK | |
2536 | bool "Enable console blanking using APM" | |
8f9ca475 | 2537 | ---help--- |
e279b6c1 SR |
2538 | Enable console blanking using the APM. Some laptops can use this to |
2539 | turn off the LCD backlight when the screen blanker of the Linux | |
2540 | virtual console blanks the screen. Note that this is only used by | |
2541 | the virtual console screen blanker, and won't turn off the backlight | |
2542 | when using the X Window system. This also doesn't have anything to | |
2543 | do with your VESA-compliant power-saving monitor. Further, this | |
2544 | option doesn't work for all laptops -- it might not turn off your | |
2545 | backlight at all, or it might print a lot of errors to the console, | |
2546 | especially if you are using gpm. | |
2547 | ||
2548 | config APM_ALLOW_INTS | |
2549 | bool "Allow interrupts during APM BIOS calls" | |
8f9ca475 | 2550 | ---help--- |
e279b6c1 SR |
2551 | Normally we disable external interrupts while we are making calls to |
2552 | the APM BIOS as a measure to lessen the effects of a badly behaving | |
2553 | BIOS implementation. The BIOS should reenable interrupts if it | |
2554 | needs to. Unfortunately, some BIOSes do not -- especially those in | |
2555 | many of the newer IBM Thinkpads. If you experience hangs when you | |
2556 | suspend, try setting this to Y. Otherwise, say N. | |
2557 | ||
e279b6c1 SR |
2558 | endif # APM |
2559 | ||
bb0a56ec | 2560 | source "drivers/cpufreq/Kconfig" |
e279b6c1 SR |
2561 | |
2562 | source "drivers/cpuidle/Kconfig" | |
2563 | ||
27471fdb AH |
2564 | source "drivers/idle/Kconfig" |
2565 | ||
e279b6c1 SR |
2566 | endmenu |
2567 | ||
2568 | ||
2569 | menu "Bus options (PCI etc.)" | |
2570 | ||
e279b6c1 SR |
2571 | choice |
2572 | prompt "PCI access mode" | |
efefa6f6 | 2573 | depends on X86_32 && PCI |
e279b6c1 SR |
2574 | default PCI_GOANY |
2575 | ---help--- | |
2576 | On PCI systems, the BIOS can be used to detect the PCI devices and | |
2577 | determine their configuration. However, some old PCI motherboards | |
2578 | have BIOS bugs and may crash if this is done. Also, some embedded | |
2579 | PCI-based systems don't have any BIOS at all. Linux can also try to | |
2580 | detect the PCI hardware directly without using the BIOS. | |
2581 | ||
2582 | With this option, you can specify how Linux should detect the | |
2583 | PCI devices. If you choose "BIOS", the BIOS will be used, | |
2584 | if you choose "Direct", the BIOS won't be used, and if you | |
2585 | choose "MMConfig", then PCI Express MMCONFIG will be used. | |
2586 | If you choose "Any", the kernel will try MMCONFIG, then the | |
2587 | direct access method and falls back to the BIOS if that doesn't | |
2588 | work. If unsure, go with the default, which is "Any". | |
2589 | ||
2590 | config PCI_GOBIOS | |
2591 | bool "BIOS" | |
2592 | ||
2593 | config PCI_GOMMCONFIG | |
2594 | bool "MMConfig" | |
2595 | ||
2596 | config PCI_GODIRECT | |
2597 | bool "Direct" | |
2598 | ||
3ef0e1f8 | 2599 | config PCI_GOOLPC |
76fb6570 | 2600 | bool "OLPC XO-1" |
3ef0e1f8 AS |
2601 | depends on OLPC |
2602 | ||
2bdd1b03 AS |
2603 | config PCI_GOANY |
2604 | bool "Any" | |
2605 | ||
e279b6c1 SR |
2606 | endchoice |
2607 | ||
2608 | config PCI_BIOS | |
3c2362e6 | 2609 | def_bool y |
efefa6f6 | 2610 | depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY) |
e279b6c1 SR |
2611 | |
2612 | # x86-64 doesn't support PCI BIOS access from long mode so always go direct. | |
2613 | config PCI_DIRECT | |
3c2362e6 | 2614 | def_bool y |
0aba496f | 2615 | depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG)) |
e279b6c1 SR |
2616 | |
2617 | config PCI_MMCONFIG | |
b45c9f36 JK |
2618 | bool "Support mmconfig PCI config space access" if X86_64 |
2619 | default y | |
8364e1f8 | 2620 | depends on PCI && (ACPI || SFI || JAILHOUSE_GUEST) |
b45c9f36 | 2621 | depends on X86_64 || (PCI_GOANY || PCI_GOMMCONFIG) |
e279b6c1 | 2622 | |
3ef0e1f8 | 2623 | config PCI_OLPC |
2bdd1b03 AS |
2624 | def_bool y |
2625 | depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY) | |
3ef0e1f8 | 2626 | |
b5401a96 AN |
2627 | config PCI_XEN |
2628 | def_bool y | |
2629 | depends on PCI && XEN | |
2630 | select SWIOTLB_XEN | |
2631 | ||
8364e1f8 JK |
2632 | config MMCONF_FAM10H |
2633 | def_bool y | |
2634 | depends on X86_64 && PCI_MMCONFIG && ACPI | |
e279b6c1 | 2635 | |
3f6ea84a | 2636 | config PCI_CNB20LE_QUIRK |
6a108a14 | 2637 | bool "Read CNB20LE Host Bridge Windows" if EXPERT |
6ea30386 | 2638 | depends on PCI |
3f6ea84a IS |
2639 | help |
2640 | Read the PCI windows out of the CNB20LE host bridge. This allows | |
2641 | PCI hotplug to work on systems with the CNB20LE chipset which do | |
2642 | not have ACPI. | |
2643 | ||
64a5fed6 BH |
2644 | There's no public spec for this chipset, and this functionality |
2645 | is known to be incomplete. | |
2646 | ||
2647 | You should say N unless you know you need this. | |
2648 | ||
3a495511 | 2649 | config ISA_BUS |
17a2a129 | 2650 | bool "ISA bus support on modern systems" if EXPERT |
3a495511 | 2651 | help |
17a2a129 WBG |
2652 | Expose ISA bus device drivers and options available for selection and |
2653 | configuration. Enable this option if your target machine has an ISA | |
2654 | bus. ISA is an older system, displaced by PCI and newer bus | |
2655 | architectures -- if your target machine is modern, it probably does | |
2656 | not have an ISA bus. | |
3a495511 WBG |
2657 | |
2658 | If unsure, say N. | |
2659 | ||
1c00f016 | 2660 | # x86_64 have no ISA slots, but can have ISA-style DMA. |
e279b6c1 | 2661 | config ISA_DMA_API |
1c00f016 DR |
2662 | bool "ISA-style DMA support" if (X86_64 && EXPERT) |
2663 | default y | |
2664 | help | |
2665 | Enables ISA-style DMA support for devices requiring such controllers. | |
2666 | If unsure, say Y. | |
e279b6c1 | 2667 | |
51e68d05 LT |
2668 | if X86_32 |
2669 | ||
e279b6c1 SR |
2670 | config ISA |
2671 | bool "ISA support" | |
8f9ca475 | 2672 | ---help--- |
e279b6c1 SR |
2673 | Find out whether you have ISA slots on your motherboard. ISA is the |
2674 | name of a bus system, i.e. the way the CPU talks to the other stuff | |
2675 | inside your box. Other bus systems are PCI, EISA, MicroChannel | |
2676 | (MCA) or VESA. ISA is an older system, now being displaced by PCI; | |
2677 | newer boards don't support it. If you have ISA, say Y, otherwise N. | |
2678 | ||
e279b6c1 SR |
2679 | config SCx200 |
2680 | tristate "NatSemi SCx200 support" | |
8f9ca475 | 2681 | ---help--- |
e279b6c1 SR |
2682 | This provides basic support for National Semiconductor's |
2683 | (now AMD's) Geode processors. The driver probes for the | |
2684 | PCI-IDs of several on-chip devices, so its a good dependency | |
2685 | for other scx200_* drivers. | |
2686 | ||
2687 | If compiled as a module, the driver is named scx200. | |
2688 | ||
2689 | config SCx200HR_TIMER | |
2690 | tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" | |
592913ec | 2691 | depends on SCx200 |
e279b6c1 | 2692 | default y |
8f9ca475 | 2693 | ---help--- |
e279b6c1 SR |
2694 | This driver provides a clocksource built upon the on-chip |
2695 | 27MHz high-resolution timer. Its also a workaround for | |
2696 | NSC Geode SC-1100's buggy TSC, which loses time when the | |
2697 | processor goes idle (as is done by the scheduler). The | |
2698 | other workaround is idle=poll boot option. | |
2699 | ||
3ef0e1f8 AS |
2700 | config OLPC |
2701 | bool "One Laptop Per Child support" | |
54008979 | 2702 | depends on !X86_PAE |
3c554946 | 2703 | select GPIOLIB |
dc3119e7 | 2704 | select OF |
45bb1674 | 2705 | select OF_PROMTREE |
b4e51854 | 2706 | select IRQ_DOMAIN |
8f9ca475 | 2707 | ---help--- |
3ef0e1f8 AS |
2708 | Add support for detecting the unique features of the OLPC |
2709 | XO hardware. | |
2710 | ||
a3128588 DD |
2711 | config OLPC_XO1_PM |
2712 | bool "OLPC XO-1 Power Management" | |
fa112cf1 | 2713 | depends on OLPC && MFD_CS5535=y && PM_SLEEP |
bf1ebf00 | 2714 | ---help--- |
97c4cb71 | 2715 | Add support for poweroff and suspend of the OLPC XO-1 laptop. |
bf1ebf00 | 2716 | |
cfee9597 DD |
2717 | config OLPC_XO1_RTC |
2718 | bool "OLPC XO-1 Real Time Clock" | |
2719 | depends on OLPC_XO1_PM && RTC_DRV_CMOS | |
2720 | ---help--- | |
2721 | Add support for the XO-1 real time clock, which can be used as a | |
2722 | programmable wakeup source. | |
2723 | ||
7feda8e9 DD |
2724 | config OLPC_XO1_SCI |
2725 | bool "OLPC XO-1 SCI extras" | |
92e830f2 | 2726 | depends on OLPC && OLPC_XO1_PM && GPIO_CS5535=y |
ed8e47fe | 2727 | depends on INPUT=y |
d8d01a63 | 2728 | select POWER_SUPPLY |
7feda8e9 DD |
2729 | ---help--- |
2730 | Add support for SCI-based features of the OLPC XO-1 laptop: | |
7bc74b3d | 2731 | - EC-driven system wakeups |
7feda8e9 | 2732 | - Power button |
7bc74b3d | 2733 | - Ebook switch |
2cf2baea | 2734 | - Lid switch |
e1040ac6 DD |
2735 | - AC adapter status updates |
2736 | - Battery status updates | |
7feda8e9 | 2737 | |
a0f30f59 DD |
2738 | config OLPC_XO15_SCI |
2739 | bool "OLPC XO-1.5 SCI extras" | |
d8d01a63 DD |
2740 | depends on OLPC && ACPI |
2741 | select POWER_SUPPLY | |
a0f30f59 DD |
2742 | ---help--- |
2743 | Add support for SCI-based features of the OLPC XO-1.5 laptop: | |
2744 | - EC-driven system wakeups | |
2745 | - AC adapter status updates | |
2746 | - Battery status updates | |
bf1ebf00 | 2747 | |
d4f3e350 EW |
2748 | config ALIX |
2749 | bool "PCEngines ALIX System Support (LED setup)" | |
2750 | select GPIOLIB | |
2751 | ---help--- | |
2752 | This option enables system support for the PCEngines ALIX. | |
2753 | At present this just sets up LEDs for GPIO control on | |
2754 | ALIX2/3/6 boards. However, other system specific setup should | |
2755 | get added here. | |
2756 | ||
2757 | Note: You must still enable the drivers for GPIO and LED support | |
2758 | (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs | |
2759 | ||
2760 | Note: You have to set alix.force=1 for boards with Award BIOS. | |
2761 | ||
da4e3302 PP |
2762 | config NET5501 |
2763 | bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)" | |
2764 | select GPIOLIB | |
2765 | ---help--- | |
2766 | This option enables system support for the Soekris Engineering net5501. | |
2767 | ||
3197059a PP |
2768 | config GEOS |
2769 | bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)" | |
2770 | select GPIOLIB | |
2771 | depends on DMI | |
2772 | ---help--- | |
2773 | This option enables system support for the Traverse Technologies GEOS. | |
2774 | ||
7d029125 VD |
2775 | config TS5500 |
2776 | bool "Technologic Systems TS-5500 platform support" | |
2777 | depends on MELAN | |
2778 | select CHECK_SIGNATURE | |
2779 | select NEW_LEDS | |
2780 | select LEDS_CLASS | |
2781 | ---help--- | |
2782 | This option enables system support for the Technologic Systems TS-5500. | |
2783 | ||
bc0120fd SR |
2784 | endif # X86_32 |
2785 | ||
23ac4ae8 | 2786 | config AMD_NB |
e279b6c1 | 2787 | def_bool y |
0e152cd7 | 2788 | depends on CPU_SUP_AMD && PCI |
e279b6c1 | 2789 | |
e3263ab3 DH |
2790 | config X86_SYSFB |
2791 | bool "Mark VGA/VBE/EFI FB as generic system framebuffer" | |
2792 | help | |
2793 | Firmwares often provide initial graphics framebuffers so the BIOS, | |
2794 | bootloader or kernel can show basic video-output during boot for | |
2795 | user-guidance and debugging. Historically, x86 used the VESA BIOS | |
2796 | Extensions and EFI-framebuffers for this, which are mostly limited | |
2797 | to x86. | |
2798 | This option, if enabled, marks VGA/VBE/EFI framebuffers as generic | |
2799 | framebuffers so the new generic system-framebuffer drivers can be | |
2800 | used on x86. If the framebuffer is not compatible with the generic | |
e3a5dc08 | 2801 | modes, it is advertised as fallback platform framebuffer so legacy |
e3263ab3 DH |
2802 | drivers like efifb, vesafb and uvesafb can pick it up. |
2803 | If this option is not selected, all system framebuffers are always | |
2804 | marked as fallback platform framebuffers as usual. | |
2805 | ||
2806 | Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will | |
2807 | not be able to pick up generic system framebuffers if this option | |
2808 | is selected. You are highly encouraged to enable simplefb as | |
2809 | replacement if you select this option. simplefb can correctly deal | |
2810 | with generic system framebuffers. But you should still keep vesafb | |
2811 | and others enabled as fallback if a system framebuffer is | |
2812 | incompatible with simplefb. | |
2813 | ||
2814 | If unsure, say Y. | |
2815 | ||
e279b6c1 SR |
2816 | endmenu |
2817 | ||
2818 | ||
1572497c | 2819 | menu "Binary Emulations" |
e279b6c1 SR |
2820 | |
2821 | config IA32_EMULATION | |
2822 | bool "IA32 Emulation" | |
2823 | depends on X86_64 | |
39f88911 | 2824 | select ARCH_WANT_OLD_COMPAT_IPC |
d1603990 | 2825 | select BINFMT_ELF |
a97f52e6 | 2826 | select COMPAT_BINFMT_ELF |
39f88911 | 2827 | select COMPAT_OLD_SIGACTION |
8f9ca475 | 2828 | ---help--- |
5fd92e65 L |
2829 | Include code to run legacy 32-bit programs under a |
2830 | 64-bit kernel. You should likely turn this on, unless you're | |
2831 | 100% sure that you don't have any 32-bit programs left. | |
e279b6c1 SR |
2832 | |
2833 | config IA32_AOUT | |
8f9ca475 IM |
2834 | tristate "IA32 a.out support" |
2835 | depends on IA32_EMULATION | |
eac61655 | 2836 | depends on BROKEN |
8f9ca475 IM |
2837 | ---help--- |
2838 | Support old a.out binaries in the 32bit emulation. | |
e279b6c1 | 2839 | |
0bf62763 | 2840 | config X86_X32 |
6ea30386 | 2841 | bool "x32 ABI for 64-bit mode" |
9b54050b | 2842 | depends on X86_64 |
5fd92e65 L |
2843 | ---help--- |
2844 | Include code to run binaries for the x32 native 32-bit ABI | |
2845 | for 64-bit processors. An x32 process gets access to the | |
2846 | full 64-bit register file and wide data path while leaving | |
2847 | pointers at 32 bits for smaller memory footprint. | |
2848 | ||
2849 | You will need a recent binutils (2.22 or later) with | |
2850 | elf32_x86_64 support enabled to compile a kernel with this | |
2851 | option set. | |
2852 | ||
953fee1d IM |
2853 | config COMPAT_32 |
2854 | def_bool y | |
2855 | depends on IA32_EMULATION || X86_32 | |
2856 | select HAVE_UID16 | |
2857 | select OLD_SIGSUSPEND3 | |
2858 | ||
e279b6c1 | 2859 | config COMPAT |
3c2362e6 | 2860 | def_bool y |
0bf62763 | 2861 | depends on IA32_EMULATION || X86_X32 |
e279b6c1 | 2862 | |
3120e25e | 2863 | if COMPAT |
e279b6c1 | 2864 | config COMPAT_FOR_U64_ALIGNMENT |
3120e25e | 2865 | def_bool y |
e279b6c1 SR |
2866 | |
2867 | config SYSVIPC_COMPAT | |
3c2362e6 | 2868 | def_bool y |
3120e25e | 2869 | depends on SYSVIPC |
3120e25e | 2870 | endif |
ee009e4a | 2871 | |
e279b6c1 SR |
2872 | endmenu |
2873 | ||
2874 | ||
e5beae16 KP |
2875 | config HAVE_ATOMIC_IOMAP |
2876 | def_bool y | |
2877 | depends on X86_32 | |
2878 | ||
4692d77f AR |
2879 | config X86_DEV_DMA_OPS |
2880 | bool | |
83125a3a | 2881 | depends on X86_64 || STA2X11 |
4692d77f | 2882 | |
f7219a53 AR |
2883 | config X86_DMA_REMAP |
2884 | bool | |
83125a3a | 2885 | depends on STA2X11 |
f7219a53 | 2886 | |
e585513b KS |
2887 | config HAVE_GENERIC_GUP |
2888 | def_bool y | |
2889 | ||
e279b6c1 SR |
2890 | source "drivers/firmware/Kconfig" |
2891 | ||
edf88417 | 2892 | source "arch/x86/kvm/Kconfig" |