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fa96b57c HC |
1 | # SPDX-License-Identifier: GPL-2.0 |
2 | config LOONGARCH | |
3 | bool | |
4 | default y | |
f30d1f49 | 5 | select ACPI |
cd057667 | 6 | select ACPI_GENERIC_GSI if ACPI |
57fc7323 | 7 | select ACPI_MCFG if ACPI |
fa96b57c HC |
8 | select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI |
9 | select ARCH_BINFMT_ELF_STATE | |
10 | select ARCH_ENABLE_MEMORY_HOTPLUG | |
11 | select ARCH_ENABLE_MEMORY_HOTREMOVE | |
12 | select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI | |
3f48f3d9 | 13 | select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS |
fa96b57c HC |
14 | select ARCH_HAS_PTE_SPECIAL |
15 | select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST | |
16 | select ARCH_INLINE_READ_LOCK if !PREEMPTION | |
17 | select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION | |
18 | select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION | |
19 | select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION | |
20 | select ARCH_INLINE_READ_UNLOCK if !PREEMPTION | |
21 | select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION | |
22 | select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION | |
23 | select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION | |
24 | select ARCH_INLINE_WRITE_LOCK if !PREEMPTION | |
25 | select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION | |
26 | select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION | |
27 | select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION | |
28 | select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION | |
29 | select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION | |
30 | select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION | |
31 | select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION | |
32 | select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION | |
33 | select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION | |
34 | select ARCH_INLINE_SPIN_LOCK if !PREEMPTION | |
35 | select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION | |
36 | select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION | |
37 | select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION | |
38 | select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION | |
39 | select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION | |
40 | select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION | |
41 | select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION | |
e0fba87c | 42 | select ARCH_KEEP_MEMBLOCK |
fa96b57c HC |
43 | select ARCH_MIGHT_HAVE_PC_PARPORT |
44 | select ARCH_MIGHT_HAVE_PC_SERIO | |
45 | select ARCH_SPARSEMEM_ENABLE | |
93a4fa62 | 46 | select ARCH_STACKWALK |
fa96b57c HC |
47 | select ARCH_SUPPORTS_ACPI |
48 | select ARCH_SUPPORTS_ATOMIC_RMW | |
49 | select ARCH_SUPPORTS_HUGETLBFS | |
d4b6f156 | 50 | select ARCH_SUPPORTS_NUMA_BALANCING |
fa96b57c HC |
51 | select ARCH_USE_BUILTIN_BSWAP |
52 | select ARCH_USE_CMPXCHG_LOCKREF | |
53 | select ARCH_USE_QUEUED_RWLOCKS | |
5f1e001b | 54 | select ARCH_USE_QUEUED_SPINLOCKS |
fa96b57c | 55 | select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT |
1429cfde | 56 | select ARCH_WANT_LD_ORPHAN_WARN |
0b376f1e | 57 | select ARCH_WANT_OPTIMIZE_VMEMMAP |
fa96b57c HC |
58 | select ARCH_WANTS_NO_INSTR |
59 | select BUILDTIME_TABLE_SORT | |
60 | select COMMON_CLK | |
366bb35a | 61 | select CPU_PM |
f30d1f49 | 62 | select EFI |
fa96b57c HC |
63 | select GENERIC_CLOCKEVENTS |
64 | select GENERIC_CMOS_UPDATE | |
65 | select GENERIC_CPU_AUTOPROBE | |
66 | select GENERIC_ENTRY | |
fa96b57c | 67 | select GENERIC_GETTIMEOFDAY |
d2791341 | 68 | select GENERIC_IOREMAP if !ARCH_IOREMAP |
fa96b57c HC |
69 | select GENERIC_IRQ_MULTI_HANDLER |
70 | select GENERIC_IRQ_PROBE | |
71 | select GENERIC_IRQ_SHOW | |
72 | select GENERIC_LIB_ASHLDI3 | |
73 | select GENERIC_LIB_ASHRDI3 | |
74 | select GENERIC_LIB_CMPDI2 | |
75 | select GENERIC_LIB_LSHRDI3 | |
76 | select GENERIC_LIB_UCMPDI2 | |
235d074f | 77 | select GENERIC_LIB_DEVMEM_IS_ALLOWED |
fa96b57c HC |
78 | select GENERIC_PCI_IOMAP |
79 | select GENERIC_SCHED_CLOCK | |
46859ac8 | 80 | select GENERIC_SMP_IDLE_THREAD |
fa96b57c HC |
81 | select GENERIC_TIME_VSYSCALL |
82 | select GPIOLIB | |
fcbfe812 | 83 | select HAS_IOPORT |
fa96b57c | 84 | select HAVE_ARCH_AUDITSYSCALL |
fa96b57c HC |
85 | select HAVE_ARCH_MMAP_RND_BITS if MMU |
86 | select HAVE_ARCH_SECCOMP_FILTER | |
87 | select HAVE_ARCH_TRACEHOOK | |
88 | select HAVE_ARCH_TRANSPARENT_HUGEPAGE | |
89 | select HAVE_ASM_MODVERSIONS | |
24a9c541 | 90 | select HAVE_CONTEXT_TRACKING_USER |
a0a458fb | 91 | select HAVE_C_RECORDMCOUNT |
fa96b57c HC |
92 | select HAVE_DEBUG_STACKOVERFLOW |
93 | select HAVE_DMA_CONTIGUOUS | |
4733f09d | 94 | select HAVE_DYNAMIC_FTRACE |
ac7127e1 | 95 | select HAVE_DYNAMIC_FTRACE_WITH_ARGS |
8778ba2c | 96 | select HAVE_DYNAMIC_FTRACE_WITH_REGS |
5dc61552 | 97 | select HAVE_EBPF_JIT |
41596803 | 98 | select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN |
fa96b57c HC |
99 | select HAVE_EXIT_THREAD |
100 | select HAVE_FAST_GUP | |
a0a458fb | 101 | select HAVE_FTRACE_MCOUNT_RECORD |
356bd6f2 | 102 | select HAVE_FUNCTION_ARG_ACCESS_API |
dbe3ba30 QZ |
103 | select HAVE_FUNCTION_GRAPH_TRACER |
104 | select HAVE_FUNCTION_TRACER | |
fa96b57c | 105 | select HAVE_GENERIC_VDSO |
edffa33c | 106 | select HAVE_HW_BREAKPOINT if PERF_EVENTS |
fa96b57c HC |
107 | select HAVE_IOREMAP_PROT |
108 | select HAVE_IRQ_EXIT_ON_IRQ_STACK | |
109 | select HAVE_IRQ_TIME_ACCOUNTING | |
6d4cc40f | 110 | select HAVE_KPROBES |
09e679c2 | 111 | select HAVE_KPROBES_ON_FTRACE |
3f553686 | 112 | select HAVE_KRETPROBES |
fa96b57c HC |
113 | select HAVE_MOD_ARCH_SPECIFIC |
114 | select HAVE_NMI | |
57fc7323 | 115 | select HAVE_PCI |
fa96b57c | 116 | select HAVE_PERF_EVENTS |
b37042b2 HC |
117 | select HAVE_PERF_REGS |
118 | select HAVE_PERF_USER_STACK_DUMP | |
fa96b57c HC |
119 | select HAVE_REGS_AND_STACK_ACCESS_API |
120 | select HAVE_RSEQ | |
d4b6f156 | 121 | select HAVE_SETUP_PER_CPU_AREA if NUMA |
09f33601 | 122 | select HAVE_STACKPROTECTOR |
fa96b57c HC |
123 | select HAVE_SYSCALL_TRACEPOINTS |
124 | select HAVE_TIF_NOHZ | |
46859ac8 | 125 | select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP |
fa96b57c HC |
126 | select IRQ_FORCED_THREADING |
127 | select IRQ_LOONGARCH_CPU | |
f30d1f49 | 128 | select MMU_GATHER_MERGE_VMAS if MMU |
fa96b57c | 129 | select MODULES_USE_ELF_RELA if MODULES |
d4b6f156 HC |
130 | select NEED_PER_CPU_EMBED_FIRST_CHUNK |
131 | select NEED_PER_CPU_PAGE_FIRST_CHUNK | |
88d4d957 BZ |
132 | select OF |
133 | select OF_EARLY_FLATTREE | |
57fc7323 HC |
134 | select PCI |
135 | select PCI_DOMAINS_GENERIC | |
136 | select PCI_ECAM if ACPI | |
137 | select PCI_LOONGSON | |
138 | select PCI_MSI_ARCH_FALLBACKS | |
7c12bb8f | 139 | select PCI_QUIRKS |
fa96b57c HC |
140 | select PERF_USE_VMALLOC |
141 | select RTC_LIB | |
f30d1f49 | 142 | select SMP |
fa96b57c | 143 | select SPARSE_IRQ |
61a6fccc HC |
144 | select SYSCTL_ARCH_UNALIGN_ALLOW |
145 | select SYSCTL_ARCH_UNALIGN_NO_WARN | |
fa96b57c HC |
146 | select SYSCTL_EXCEPTION_TRACE |
147 | select SWIOTLB | |
148 | select TRACE_IRQFLAGS_SUPPORT | |
d4b6f156 | 149 | select USE_PERCPU_NUMA_NODE_ID |
4d7bf939 | 150 | select USER_STACKTRACE_SUPPORT |
fa96b57c HC |
151 | select ZONE_DMA32 |
152 | ||
153 | config 32BIT | |
154 | bool | |
155 | ||
156 | config 64BIT | |
157 | def_bool y | |
158 | ||
159 | config CPU_HAS_FPU | |
160 | bool | |
161 | default y | |
162 | ||
163 | config CPU_HAS_PREFETCH | |
164 | bool | |
165 | default y | |
166 | ||
2d2c3952 YT |
167 | config GENERIC_BUG |
168 | def_bool y | |
169 | depends on BUG | |
170 | ||
171 | config GENERIC_BUG_RELATIVE_POINTERS | |
172 | def_bool y | |
173 | depends on GENERIC_BUG | |
174 | ||
fa96b57c HC |
175 | config GENERIC_CALIBRATE_DELAY |
176 | def_bool y | |
177 | ||
178 | config GENERIC_CSUM | |
179 | def_bool y | |
180 | ||
181 | config GENERIC_HWEIGHT | |
182 | def_bool y | |
183 | ||
184 | config L1_CACHE_SHIFT | |
185 | int | |
186 | default "6" | |
187 | ||
188 | config LOCKDEP_SUPPORT | |
189 | bool | |
93a4fa62 QZ |
190 | default y |
191 | ||
192 | config STACKTRACE_SUPPORT | |
193 | bool | |
fa96b57c HC |
194 | default y |
195 | ||
9550dfde | 196 | # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the |
fa96b57c HC |
197 | # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that |
198 | # are shared between architectures, and specifically expecting the symbols. | |
199 | config MACH_LOONGSON32 | |
200 | def_bool 32BIT | |
201 | ||
202 | config MACH_LOONGSON64 | |
203 | def_bool 64BIT | |
204 | ||
d2791341 HC |
205 | config FIX_EARLYCON_MEM |
206 | def_bool y | |
207 | ||
fa96b57c HC |
208 | config PAGE_SIZE_4KB |
209 | bool | |
210 | ||
211 | config PAGE_SIZE_16KB | |
212 | bool | |
213 | ||
214 | config PAGE_SIZE_64KB | |
215 | bool | |
216 | ||
217 | config PGTABLE_2LEVEL | |
218 | bool | |
219 | ||
220 | config PGTABLE_3LEVEL | |
221 | bool | |
222 | ||
223 | config PGTABLE_4LEVEL | |
224 | bool | |
225 | ||
226 | config PGTABLE_LEVELS | |
227 | int | |
228 | default 2 if PGTABLE_2LEVEL | |
229 | default 3 if PGTABLE_3LEVEL | |
230 | default 4 if PGTABLE_4LEVEL | |
231 | ||
232 | config SCHED_OMIT_FRAME_POINTER | |
233 | bool | |
234 | default y | |
235 | ||
0d8dad70 XR |
236 | config AS_HAS_EXPLICIT_RELOCS |
237 | def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x)) | |
238 | ||
fa96b57c HC |
239 | menu "Kernel type and options" |
240 | ||
241 | source "kernel/Kconfig.hz" | |
242 | ||
243 | choice | |
244 | prompt "Page Table Layout" | |
245 | default 16KB_2LEVEL if 32BIT | |
246 | default 16KB_3LEVEL if 64BIT | |
247 | help | |
248 | Allows choosing the page table layout, which is a combination | |
249 | of page size and page table levels. The size of virtual memory | |
250 | address space are determined by the page table layout. | |
251 | ||
252 | config 4KB_3LEVEL | |
253 | bool "4KB with 3 levels" | |
254 | select PAGE_SIZE_4KB | |
255 | select PGTABLE_3LEVEL | |
256 | help | |
257 | This option selects 4KB page size with 3 level page tables, which | |
258 | support a maximum of 39 bits of application virtual memory. | |
259 | ||
260 | config 4KB_4LEVEL | |
261 | bool "4KB with 4 levels" | |
262 | select PAGE_SIZE_4KB | |
263 | select PGTABLE_4LEVEL | |
264 | help | |
265 | This option selects 4KB page size with 4 level page tables, which | |
266 | support a maximum of 48 bits of application virtual memory. | |
267 | ||
268 | config 16KB_2LEVEL | |
269 | bool "16KB with 2 levels" | |
270 | select PAGE_SIZE_16KB | |
271 | select PGTABLE_2LEVEL | |
272 | help | |
273 | This option selects 16KB page size with 2 level page tables, which | |
274 | support a maximum of 36 bits of application virtual memory. | |
275 | ||
276 | config 16KB_3LEVEL | |
277 | bool "16KB with 3 levels" | |
278 | select PAGE_SIZE_16KB | |
279 | select PGTABLE_3LEVEL | |
280 | help | |
281 | This option selects 16KB page size with 3 level page tables, which | |
282 | support a maximum of 47 bits of application virtual memory. | |
283 | ||
284 | config 64KB_2LEVEL | |
285 | bool "64KB with 2 levels" | |
286 | select PAGE_SIZE_64KB | |
287 | select PGTABLE_2LEVEL | |
288 | help | |
289 | This option selects 64KB page size with 2 level page tables, which | |
290 | support a maximum of 42 bits of application virtual memory. | |
291 | ||
292 | config 64KB_3LEVEL | |
293 | bool "64KB with 3 levels" | |
294 | select PAGE_SIZE_64KB | |
295 | select PGTABLE_3LEVEL | |
296 | help | |
297 | This option selects 64KB page size with 3 level page tables, which | |
298 | support a maximum of 55 bits of application virtual memory. | |
299 | ||
300 | endchoice | |
301 | ||
302 | config CMDLINE | |
303 | string "Built-in kernel command line" | |
304 | help | |
305 | For most platforms, the arguments for the kernel's command line | |
306 | are provided at run-time, during boot. However, there are cases | |
307 | where either no arguments are being provided or the provided | |
308 | arguments are insufficient or even invalid. | |
309 | ||
310 | When that occurs, it is possible to define a built-in command | |
311 | line here and choose how the kernel should use it later on. | |
312 | ||
313 | choice | |
314 | prompt "Kernel command line type" | |
315 | default CMDLINE_BOOTLOADER | |
316 | help | |
317 | Choose how the kernel will handle the provided built-in command | |
318 | line. | |
319 | ||
320 | config CMDLINE_BOOTLOADER | |
321 | bool "Use bootloader kernel arguments if available" | |
322 | help | |
323 | Prefer the command-line passed by the boot loader if available. | |
324 | Use the built-in command line as fallback in case we get nothing | |
325 | during boot. This is the default behaviour. | |
326 | ||
327 | config CMDLINE_EXTEND | |
328 | bool "Use built-in to extend bootloader kernel arguments" | |
329 | help | |
330 | The command-line arguments provided during boot will be | |
331 | appended to the built-in command line. This is useful in | |
332 | cases where the provided arguments are insufficient and | |
333 | you don't want to or cannot modify them. | |
334 | ||
335 | config CMDLINE_FORCE | |
336 | bool "Always use the built-in kernel command string" | |
337 | help | |
338 | Always use the built-in command line, even if we get one during | |
339 | boot. This is useful in case you need to override the provided | |
340 | command line on systems where you don't have or want control | |
341 | over it. | |
342 | ||
343 | endchoice | |
344 | ||
345 | config DMI | |
346 | bool "Enable DMI scanning" | |
347 | select DMI_SCAN_MACHINE_NON_EFI_FALLBACK | |
348 | default y | |
349 | help | |
350 | This enables SMBIOS/DMI feature for systems, and scanning of | |
351 | DMI to identify machine quirks. | |
352 | ||
353 | config EFI | |
354 | bool "EFI runtime service support" | |
355 | select UCS2_STRING | |
fa96b57c HC |
356 | select EFI_RUNTIME_WRAPPERS |
357 | help | |
358 | This enables the kernel to use EFI runtime services that are | |
359 | available (such as the EFI variable services). | |
360 | ||
ead384d9 HC |
361 | config EFI_STUB |
362 | bool "EFI boot stub support" | |
363 | default y | |
364 | depends on EFI | |
365 | select EFI_GENERIC_STUB | |
366 | help | |
367 | This kernel feature allows the kernel to be loaded directly by | |
368 | EFI firmware without the use of a bootloader. | |
369 | ||
46859ac8 HC |
370 | config SMP |
371 | bool "Multi-Processing support" | |
372 | help | |
373 | This enables support for systems with more than one CPU. If you have | |
374 | a system with only one CPU, say N. If you have a system with more | |
375 | than one CPU, say Y. | |
376 | ||
377 | If you say N here, the kernel will run on uni- and multiprocessor | |
378 | machines, but will use only one CPU of a multiprocessor machine. If | |
379 | you say Y here, the kernel will run on many, but not all, | |
380 | uniprocessor machines. On a uniprocessor machine, the kernel | |
381 | will run faster if you say N here. | |
382 | ||
383 | See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. | |
384 | ||
385 | If you don't know what to do here, say N. | |
386 | ||
387 | config HOTPLUG_CPU | |
388 | bool "Support for hot-pluggable CPUs" | |
389 | depends on SMP | |
390 | select GENERIC_IRQ_MIGRATION | |
391 | help | |
392 | Say Y here to allow turning CPUs off and on. CPUs can be | |
393 | controlled through /sys/devices/system/cpu. | |
394 | (Note: power management support will enable this option | |
395 | automatically on SMP systems. ) | |
396 | Say N if you want to disable CPU hotplug. | |
397 | ||
398 | config NR_CPUS | |
399 | int "Maximum number of CPUs (2-256)" | |
400 | range 2 256 | |
401 | depends on SMP | |
402 | default "64" | |
403 | help | |
404 | This allows you to specify the maximum number of CPUs which this | |
405 | kernel will support. | |
406 | ||
d4b6f156 HC |
407 | config NUMA |
408 | bool "NUMA Support" | |
255b4658 | 409 | select SMP |
d4b6f156 HC |
410 | select ACPI_NUMA if ACPI |
411 | help | |
412 | Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) | |
413 | support. This option improves performance on systems with more | |
414 | than one NUMA node; on single node systems it is generally better | |
415 | to leave it disabled. | |
416 | ||
417 | config NODES_SHIFT | |
418 | int | |
419 | default "6" | |
420 | depends on NUMA | |
421 | ||
0192445c | 422 | config ARCH_FORCE_MAX_ORDER |
fa96b57c | 423 | int "Maximum zone order" |
23baf831 | 424 | default "13" if PAGE_SIZE_64KB |
23baf831 | 425 | default "11" if PAGE_SIZE_16KB |
23baf831 | 426 | default "10" |
fa96b57c HC |
427 | help |
428 | The kernel memory allocator divides physically contiguous memory | |
429 | blocks into "zones", where each zone is a power of two number of | |
430 | pages. This option selects the largest power of two that the kernel | |
431 | keeps in the memory allocator. If you need to allocate very large | |
432 | blocks of physically contiguous memory, then you may need to | |
433 | increase this value. | |
434 | ||
fa96b57c HC |
435 | The page size is not necessarily 4KB. Keep this in mind |
436 | when choosing a value for this option. | |
437 | ||
d2791341 HC |
438 | config ARCH_IOREMAP |
439 | bool "Enable LoongArch DMW-based ioremap()" | |
440 | help | |
441 | We use generic TLB-based ioremap() by default since it has page | |
442 | protection support. However, you can enable LoongArch DMW-based | |
443 | ioremap() for better performance. | |
444 | ||
16c52e50 HC |
445 | config ARCH_WRITECOMBINE |
446 | bool "Enable WriteCombine (WUC) for ioremap()" | |
447 | help | |
448 | LoongArch maintains cache coherency in hardware, but when paired | |
449 | with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which | |
450 | is similar to WriteCombine) is out of the scope of cache coherency | |
451 | machanism for PCIe devices (this is a PCIe protocol violation, which | |
452 | may be fixed in newer chipsets). | |
453 | ||
454 | This means WUC can only used for write-only memory regions now, so | |
455 | this option is disabled by default, making WUC silently fallback to | |
456 | SUC for ioremap(). You can enable this option if the kernel is ensured | |
457 | to run on hardware without this bug. | |
458 | ||
459 | You can override this setting via writecombine=on/off boot parameter. | |
460 | ||
41596803 HC |
461 | config ARCH_STRICT_ALIGN |
462 | bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT | |
463 | default y | |
464 | help | |
465 | Not all LoongArch cores support h/w unaligned access, we can use | |
466 | -mstrict-align build parameter to prevent unaligned accesses. | |
467 | ||
468 | CPUs with h/w unaligned access support: | |
469 | Loongson-2K2000/2K3000/3A5000/3C5000/3D5000. | |
470 | ||
471 | CPUs without h/w unaligned access support: | |
472 | Loongson-2K500/2K1000. | |
473 | ||
474 | This option is enabled by default to make the kernel be able to run | |
475 | on all LoongArch systems. But you can disable it manually if you want | |
476 | to run kernel only on systems with h/w unaligned access support in | |
477 | order to optimise for performance. | |
478 | ||
4a03b2ac YT |
479 | config KEXEC |
480 | bool "Kexec system call" | |
481 | select KEXEC_CORE | |
482 | help | |
483 | kexec is a system call that implements the ability to shutdown your | |
484 | current kernel, and to start another kernel. It is like a reboot | |
485 | but it is independent of the system firmware. And like a reboot | |
486 | you can start any kernel with it, not just Linux. | |
487 | ||
488 | The name comes from the similarity to the exec system call. | |
489 | ||
4e62d1d8 YT |
490 | config CRASH_DUMP |
491 | bool "Build kdump crash kernel" | |
3f89765d | 492 | select RELOCATABLE |
4e62d1d8 YT |
493 | help |
494 | Generate crash dump after being started by kexec. This should | |
495 | be normally only set in special crash dump kernels which are | |
496 | loaded in the main kernel with kexec-tools into a specially | |
497 | reserved region and then later executed after a crash by | |
498 | kdump/kexec. | |
499 | ||
500 | For more details see Documentation/admin-guide/kdump/kdump.rst | |
501 | ||
d8da19fb YT |
502 | config RELOCATABLE |
503 | bool "Relocatable kernel" | |
504 | help | |
505 | This builds the kernel as a Position Independent Executable (PIE), | |
506 | which retains all relocation metadata required, so as to relocate | |
507 | the kernel binary at runtime to a different virtual address from | |
508 | its link address. | |
509 | ||
e5f02b51 YT |
510 | config RANDOMIZE_BASE |
511 | bool "Randomize the address of the kernel (KASLR)" | |
512 | depends on RELOCATABLE | |
513 | help | |
514 | Randomizes the physical and virtual address at which the | |
515 | kernel image is loaded, as a security feature that | |
516 | deters exploit attempts relying on knowledge of the location | |
517 | of kernel internals. | |
518 | ||
519 | The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET. | |
520 | ||
521 | If unsure, say N. | |
522 | ||
523 | config RANDOMIZE_BASE_MAX_OFFSET | |
524 | hex "Maximum KASLR offset" if EXPERT | |
525 | depends on RANDOMIZE_BASE | |
526 | range 0x0 0x10000000 | |
527 | default "0x01000000" | |
528 | help | |
529 | When KASLR is active, this provides the maximum offset that will | |
530 | be applied to the kernel image. It should be set according to the | |
531 | amount of physical RAM available in the target system. | |
532 | ||
533 | This is limited by the size of the lower address memory, 256MB. | |
534 | ||
fa96b57c HC |
535 | config SECCOMP |
536 | bool "Enable seccomp to safely compute untrusted bytecode" | |
537 | depends on PROC_FS | |
538 | default y | |
539 | help | |
540 | This kernel feature is useful for number crunching applications | |
541 | that may need to compute untrusted bytecode during their | |
542 | execution. By using pipes or other transports made available to | |
543 | the process as file descriptors supporting the read/write | |
544 | syscalls, it's possible to isolate those applications in | |
545 | their own address space using seccomp. Once seccomp is | |
546 | enabled via /proc/<pid>/seccomp, it cannot be disabled | |
547 | and the task is only allowed to execute a few safe syscalls | |
548 | defined by each seccomp mode. | |
549 | ||
550 | If unsure, say Y. Only embedded should say N here. | |
551 | ||
552 | endmenu | |
553 | ||
554 | config ARCH_SELECT_MEMORY_MODEL | |
555 | def_bool y | |
556 | ||
557 | config ARCH_FLATMEM_ENABLE | |
558 | def_bool y | |
d4b6f156 | 559 | depends on !NUMA |
fa96b57c HC |
560 | |
561 | config ARCH_SPARSEMEM_ENABLE | |
562 | def_bool y | |
7b09f5af | 563 | select SPARSEMEM_VMEMMAP_ENABLE |
fa96b57c HC |
564 | help |
565 | Say Y to support efficient handling of sparse physical memory, | |
566 | for architectures which are either NUMA (Non-Uniform Memory Access) | |
567 | or have huge holes in the physical address space for other reasons. | |
ee65728e | 568 | See <file:Documentation/mm/numa.rst> for more. |
fa96b57c HC |
569 | |
570 | config ARCH_ENABLE_THP_MIGRATION | |
571 | def_bool y | |
572 | depends on TRANSPARENT_HUGEPAGE | |
573 | ||
574 | config ARCH_MEMORY_PROBE | |
575 | def_bool y | |
576 | depends on MEMORY_HOTPLUG | |
577 | ||
578 | config MMU | |
579 | bool | |
580 | default y | |
581 | ||
582 | config ARCH_MMAP_RND_BITS_MIN | |
583 | default 12 | |
584 | ||
585 | config ARCH_MMAP_RND_BITS_MAX | |
586 | default 18 | |
587 | ||
588 | menu "Power management options" | |
589 | ||
366bb35a HC |
590 | config ARCH_SUSPEND_POSSIBLE |
591 | def_bool y | |
592 | ||
7db54bfe HC |
593 | config ARCH_HIBERNATION_POSSIBLE |
594 | def_bool y | |
595 | ||
366bb35a | 596 | source "kernel/power/Kconfig" |
fa96b57c HC |
597 | source "drivers/acpi/Kconfig" |
598 | ||
599 | endmenu | |
600 | ||
601 | source "drivers/firmware/Kconfig" |