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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 |
f6f0c9a7 | 8 | select ACPI_PPTT if ACPI |
fa96b57c HC |
9 | select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI |
10 | select ARCH_BINFMT_ELF_STATE | |
5aa4ac64 | 11 | select ARCH_DISABLE_KASAN_INLINE |
fa96b57c HC |
12 | select ARCH_ENABLE_MEMORY_HOTPLUG |
13 | select ARCH_ENABLE_MEMORY_HOTREMOVE | |
14 | select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI | |
9841c423 | 15 | select ARCH_HAS_CPU_FINALIZE_INIT |
d4c937c2 | 16 | select ARCH_HAS_FORTIFY_SOURCE |
2363088e | 17 | select ARCH_HAS_KCOV |
3f48f3d9 | 18 | select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS |
de0e30be | 19 | select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE |
fa96b57c HC |
20 | select ARCH_HAS_PTE_SPECIAL |
21 | select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST | |
22 | select ARCH_INLINE_READ_LOCK if !PREEMPTION | |
23 | select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION | |
24 | select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION | |
25 | select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION | |
26 | select ARCH_INLINE_READ_UNLOCK if !PREEMPTION | |
27 | select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION | |
28 | select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION | |
29 | select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION | |
30 | select ARCH_INLINE_WRITE_LOCK if !PREEMPTION | |
31 | select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION | |
32 | select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION | |
33 | select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION | |
34 | select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION | |
35 | select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION | |
36 | select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION | |
37 | select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION | |
38 | select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION | |
39 | select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION | |
40 | select ARCH_INLINE_SPIN_LOCK if !PREEMPTION | |
41 | select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION | |
42 | select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION | |
43 | select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION | |
44 | select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION | |
45 | select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION | |
46 | select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION | |
47 | select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION | |
e0fba87c | 48 | select ARCH_KEEP_MEMBLOCK |
fa96b57c HC |
49 | select ARCH_MIGHT_HAVE_PC_PARPORT |
50 | select ARCH_MIGHT_HAVE_PC_SERIO | |
51 | select ARCH_SPARSEMEM_ENABLE | |
93a4fa62 | 52 | select ARCH_STACKWALK |
fa96b57c HC |
53 | select ARCH_SUPPORTS_ACPI |
54 | select ARCH_SUPPORTS_ATOMIC_RMW | |
55 | select ARCH_SUPPORTS_HUGETLBFS | |
5a31ed46 WX |
56 | select ARCH_SUPPORTS_LTO_CLANG |
57 | select ARCH_SUPPORTS_LTO_CLANG_THIN | |
d4b6f156 | 58 | select ARCH_SUPPORTS_NUMA_BALANCING |
fa96b57c HC |
59 | select ARCH_USE_BUILTIN_BSWAP |
60 | select ARCH_USE_CMPXCHG_LOCKREF | |
61 | select ARCH_USE_QUEUED_RWLOCKS | |
5f1e001b | 62 | select ARCH_USE_QUEUED_SPINLOCKS |
fa96b57c | 63 | select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT |
1429cfde | 64 | select ARCH_WANT_LD_ORPHAN_WARN |
0b6f1582 | 65 | select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP |
fa96b57c HC |
66 | select ARCH_WANTS_NO_INSTR |
67 | select BUILDTIME_TABLE_SORT | |
68 | select COMMON_CLK | |
366bb35a | 69 | select CPU_PM |
f30d1f49 | 70 | select EFI |
fa96b57c HC |
71 | select GENERIC_CLOCKEVENTS |
72 | select GENERIC_CMOS_UPDATE | |
73 | select GENERIC_CPU_AUTOPROBE | |
74 | select GENERIC_ENTRY | |
fa96b57c | 75 | select GENERIC_GETTIMEOFDAY |
d2791341 | 76 | select GENERIC_IOREMAP if !ARCH_IOREMAP |
fa96b57c HC |
77 | select GENERIC_IRQ_MULTI_HANDLER |
78 | select GENERIC_IRQ_PROBE | |
79 | select GENERIC_IRQ_SHOW | |
80 | select GENERIC_LIB_ASHLDI3 | |
81 | select GENERIC_LIB_ASHRDI3 | |
82 | select GENERIC_LIB_CMPDI2 | |
83 | select GENERIC_LIB_LSHRDI3 | |
84 | select GENERIC_LIB_UCMPDI2 | |
235d074f | 85 | select GENERIC_LIB_DEVMEM_IS_ALLOWED |
fa96b57c HC |
86 | select GENERIC_PCI_IOMAP |
87 | select GENERIC_SCHED_CLOCK | |
46859ac8 | 88 | select GENERIC_SMP_IDLE_THREAD |
fa96b57c | 89 | select GENERIC_TIME_VSYSCALL |
aa5e65dc | 90 | select GENERIC_VDSO_TIME_NS |
fa96b57c | 91 | select GPIOLIB |
fcbfe812 | 92 | select HAS_IOPORT |
fa96b57c | 93 | select HAVE_ARCH_AUDITSYSCALL |
f02644e3 YT |
94 | select HAVE_ARCH_JUMP_LABEL |
95 | select HAVE_ARCH_JUMP_LABEL_RELATIVE | |
5aa4ac64 | 96 | select HAVE_ARCH_KASAN |
6ad3df56 | 97 | select HAVE_ARCH_KFENCE |
e14dd076 | 98 | select HAVE_ARCH_KGDB if PERF_EVENTS |
fa96b57c HC |
99 | select HAVE_ARCH_MMAP_RND_BITS if MMU |
100 | select HAVE_ARCH_SECCOMP_FILTER | |
101 | select HAVE_ARCH_TRACEHOOK | |
102 | select HAVE_ARCH_TRANSPARENT_HUGEPAGE | |
103 | select HAVE_ASM_MODVERSIONS | |
24a9c541 | 104 | select HAVE_CONTEXT_TRACKING_USER |
a0a458fb | 105 | select HAVE_C_RECORDMCOUNT |
5d553770 | 106 | select HAVE_DEBUG_KMEMLEAK |
fa96b57c HC |
107 | select HAVE_DEBUG_STACKOVERFLOW |
108 | select HAVE_DMA_CONTIGUOUS | |
4733f09d | 109 | select HAVE_DYNAMIC_FTRACE |
ac7127e1 | 110 | select HAVE_DYNAMIC_FTRACE_WITH_ARGS |
9cdc3b6a | 111 | select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS |
8778ba2c | 112 | select HAVE_DYNAMIC_FTRACE_WITH_REGS |
5dc61552 | 113 | select HAVE_EBPF_JIT |
41596803 | 114 | select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN |
fa96b57c HC |
115 | select HAVE_EXIT_THREAD |
116 | select HAVE_FAST_GUP | |
a0a458fb | 117 | select HAVE_FTRACE_MCOUNT_RECORD |
356bd6f2 | 118 | select HAVE_FUNCTION_ARG_ACCESS_API |
8b5ee2c6 | 119 | select HAVE_FUNCTION_ERROR_INJECTION |
5779e3c0 | 120 | select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER |
dbe3ba30 QZ |
121 | select HAVE_FUNCTION_GRAPH_TRACER |
122 | select HAVE_FUNCTION_TRACER | |
2363088e | 123 | select HAVE_GCC_PLUGINS |
fa96b57c | 124 | select HAVE_GENERIC_VDSO |
edffa33c | 125 | select HAVE_HW_BREAKPOINT if PERF_EVENTS |
fa96b57c HC |
126 | select HAVE_IOREMAP_PROT |
127 | select HAVE_IRQ_EXIT_ON_IRQ_STACK | |
128 | select HAVE_IRQ_TIME_ACCOUNTING | |
6d4cc40f | 129 | select HAVE_KPROBES |
09e679c2 | 130 | select HAVE_KPROBES_ON_FTRACE |
3f553686 | 131 | select HAVE_KRETPROBES |
fa96b57c HC |
132 | select HAVE_MOD_ARCH_SPECIFIC |
133 | select HAVE_NMI | |
57fc7323 | 134 | select HAVE_PCI |
fa96b57c | 135 | select HAVE_PERF_EVENTS |
b37042b2 HC |
136 | select HAVE_PERF_REGS |
137 | select HAVE_PERF_USER_STACK_DUMP | |
fa96b57c | 138 | select HAVE_REGS_AND_STACK_ACCESS_API |
7b0a0964 | 139 | select HAVE_RETHOOK |
fa96b57c | 140 | select HAVE_RSEQ |
22f367a6 YT |
141 | select HAVE_SAMPLE_FTRACE_DIRECT |
142 | select HAVE_SAMPLE_FTRACE_DIRECT_MULTI | |
d4b6f156 | 143 | select HAVE_SETUP_PER_CPU_AREA if NUMA |
09f33601 | 144 | select HAVE_STACKPROTECTOR |
fa96b57c HC |
145 | select HAVE_SYSCALL_TRACEPOINTS |
146 | select HAVE_TIF_NOHZ | |
46859ac8 | 147 | select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP |
fa96b57c HC |
148 | select IRQ_FORCED_THREADING |
149 | select IRQ_LOONGARCH_CPU | |
a050ba1e | 150 | select LOCK_MM_AND_FIND_VMA |
f30d1f49 | 151 | select MMU_GATHER_MERGE_VMAS if MMU |
fa96b57c | 152 | select MODULES_USE_ELF_RELA if MODULES |
d4b6f156 HC |
153 | select NEED_PER_CPU_EMBED_FIRST_CHUNK |
154 | select NEED_PER_CPU_PAGE_FIRST_CHUNK | |
88d4d957 BZ |
155 | select OF |
156 | select OF_EARLY_FLATTREE | |
57fc7323 HC |
157 | select PCI |
158 | select PCI_DOMAINS_GENERIC | |
159 | select PCI_ECAM if ACPI | |
160 | select PCI_LOONGSON | |
161 | select PCI_MSI_ARCH_FALLBACKS | |
7c12bb8f | 162 | select PCI_QUIRKS |
fa96b57c HC |
163 | select PERF_USE_VMALLOC |
164 | select RTC_LIB | |
f30d1f49 | 165 | select SMP |
fa96b57c | 166 | select SPARSE_IRQ |
61a6fccc HC |
167 | select SYSCTL_ARCH_UNALIGN_ALLOW |
168 | select SYSCTL_ARCH_UNALIGN_NO_WARN | |
fa96b57c HC |
169 | select SYSCTL_EXCEPTION_TRACE |
170 | select SWIOTLB | |
171 | select TRACE_IRQFLAGS_SUPPORT | |
d4b6f156 | 172 | select USE_PERCPU_NUMA_NODE_ID |
4d7bf939 | 173 | select USER_STACKTRACE_SUPPORT |
fa96b57c HC |
174 | select ZONE_DMA32 |
175 | ||
176 | config 32BIT | |
177 | bool | |
178 | ||
179 | config 64BIT | |
180 | def_bool y | |
181 | ||
2d2c3952 YT |
182 | config GENERIC_BUG |
183 | def_bool y | |
184 | depends on BUG | |
185 | ||
186 | config GENERIC_BUG_RELATIVE_POINTERS | |
187 | def_bool y | |
188 | depends on GENERIC_BUG | |
189 | ||
fa96b57c HC |
190 | config GENERIC_CALIBRATE_DELAY |
191 | def_bool y | |
192 | ||
193 | config GENERIC_CSUM | |
194 | def_bool y | |
195 | ||
196 | config GENERIC_HWEIGHT | |
197 | def_bool y | |
198 | ||
199 | config L1_CACHE_SHIFT | |
200 | int | |
201 | default "6" | |
202 | ||
203 | config LOCKDEP_SUPPORT | |
204 | bool | |
93a4fa62 QZ |
205 | default y |
206 | ||
207 | config STACKTRACE_SUPPORT | |
208 | bool | |
fa96b57c HC |
209 | default y |
210 | ||
9550dfde | 211 | # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the |
fa96b57c HC |
212 | # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that |
213 | # are shared between architectures, and specifically expecting the symbols. | |
214 | config MACH_LOONGSON32 | |
215 | def_bool 32BIT | |
216 | ||
217 | config MACH_LOONGSON64 | |
218 | def_bool 64BIT | |
219 | ||
d2791341 HC |
220 | config FIX_EARLYCON_MEM |
221 | def_bool y | |
222 | ||
fa96b57c HC |
223 | config PAGE_SIZE_4KB |
224 | bool | |
225 | ||
226 | config PAGE_SIZE_16KB | |
227 | bool | |
228 | ||
229 | config PAGE_SIZE_64KB | |
230 | bool | |
231 | ||
232 | config PGTABLE_2LEVEL | |
233 | bool | |
234 | ||
235 | config PGTABLE_3LEVEL | |
236 | bool | |
237 | ||
238 | config PGTABLE_4LEVEL | |
239 | bool | |
240 | ||
241 | config PGTABLE_LEVELS | |
242 | int | |
243 | default 2 if PGTABLE_2LEVEL | |
244 | default 3 if PGTABLE_3LEVEL | |
245 | default 4 if PGTABLE_4LEVEL | |
246 | ||
247 | config SCHED_OMIT_FRAME_POINTER | |
248 | bool | |
249 | default y | |
250 | ||
0d8dad70 XR |
251 | config AS_HAS_EXPLICIT_RELOCS |
252 | def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x)) | |
253 | ||
38bb46f9 WX |
254 | config AS_HAS_FCSR_CLASS |
255 | def_bool $(as-instr,movfcsr2gr \$t0$(comma)\$fcsr0) | |
256 | ||
61650023 HC |
257 | config AS_HAS_LSX_EXTENSION |
258 | def_bool $(as-instr,vld \$vr0$(comma)\$a0$(comma)0) | |
259 | ||
260 | config AS_HAS_LASX_EXTENSION | |
261 | def_bool $(as-instr,xvld \$xr0$(comma)\$a0$(comma)0) | |
262 | ||
bd3c5798 QH |
263 | config AS_HAS_LBT_EXTENSION |
264 | def_bool $(as-instr,movscr2gr \$a0$(comma)\$scr0) | |
265 | ||
fa96b57c HC |
266 | menu "Kernel type and options" |
267 | ||
268 | source "kernel/Kconfig.hz" | |
269 | ||
270 | choice | |
271 | prompt "Page Table Layout" | |
272 | default 16KB_2LEVEL if 32BIT | |
273 | default 16KB_3LEVEL if 64BIT | |
274 | help | |
275 | Allows choosing the page table layout, which is a combination | |
276 | of page size and page table levels. The size of virtual memory | |
277 | address space are determined by the page table layout. | |
278 | ||
279 | config 4KB_3LEVEL | |
280 | bool "4KB with 3 levels" | |
281 | select PAGE_SIZE_4KB | |
282 | select PGTABLE_3LEVEL | |
283 | help | |
284 | This option selects 4KB page size with 3 level page tables, which | |
285 | support a maximum of 39 bits of application virtual memory. | |
286 | ||
287 | config 4KB_4LEVEL | |
288 | bool "4KB with 4 levels" | |
289 | select PAGE_SIZE_4KB | |
290 | select PGTABLE_4LEVEL | |
291 | help | |
292 | This option selects 4KB page size with 4 level page tables, which | |
293 | support a maximum of 48 bits of application virtual memory. | |
294 | ||
295 | config 16KB_2LEVEL | |
296 | bool "16KB with 2 levels" | |
297 | select PAGE_SIZE_16KB | |
298 | select PGTABLE_2LEVEL | |
299 | help | |
300 | This option selects 16KB page size with 2 level page tables, which | |
301 | support a maximum of 36 bits of application virtual memory. | |
302 | ||
303 | config 16KB_3LEVEL | |
304 | bool "16KB with 3 levels" | |
305 | select PAGE_SIZE_16KB | |
306 | select PGTABLE_3LEVEL | |
307 | help | |
308 | This option selects 16KB page size with 3 level page tables, which | |
309 | support a maximum of 47 bits of application virtual memory. | |
310 | ||
311 | config 64KB_2LEVEL | |
312 | bool "64KB with 2 levels" | |
313 | select PAGE_SIZE_64KB | |
314 | select PGTABLE_2LEVEL | |
315 | help | |
316 | This option selects 64KB page size with 2 level page tables, which | |
317 | support a maximum of 42 bits of application virtual memory. | |
318 | ||
319 | config 64KB_3LEVEL | |
320 | bool "64KB with 3 levels" | |
321 | select PAGE_SIZE_64KB | |
322 | select PGTABLE_3LEVEL | |
323 | help | |
324 | This option selects 64KB page size with 3 level page tables, which | |
325 | support a maximum of 55 bits of application virtual memory. | |
326 | ||
327 | endchoice | |
328 | ||
329 | config CMDLINE | |
330 | string "Built-in kernel command line" | |
331 | help | |
332 | For most platforms, the arguments for the kernel's command line | |
333 | are provided at run-time, during boot. However, there are cases | |
334 | where either no arguments are being provided or the provided | |
335 | arguments are insufficient or even invalid. | |
336 | ||
337 | When that occurs, it is possible to define a built-in command | |
338 | line here and choose how the kernel should use it later on. | |
339 | ||
340 | choice | |
341 | prompt "Kernel command line type" | |
342 | default CMDLINE_BOOTLOADER | |
343 | help | |
344 | Choose how the kernel will handle the provided built-in command | |
345 | line. | |
346 | ||
347 | config CMDLINE_BOOTLOADER | |
348 | bool "Use bootloader kernel arguments if available" | |
349 | help | |
350 | Prefer the command-line passed by the boot loader if available. | |
351 | Use the built-in command line as fallback in case we get nothing | |
352 | during boot. This is the default behaviour. | |
353 | ||
354 | config CMDLINE_EXTEND | |
355 | bool "Use built-in to extend bootloader kernel arguments" | |
356 | help | |
357 | The command-line arguments provided during boot will be | |
358 | appended to the built-in command line. This is useful in | |
359 | cases where the provided arguments are insufficient and | |
360 | you don't want to or cannot modify them. | |
361 | ||
362 | config CMDLINE_FORCE | |
363 | bool "Always use the built-in kernel command string" | |
364 | help | |
365 | Always use the built-in command line, even if we get one during | |
366 | boot. This is useful in case you need to override the provided | |
367 | command line on systems where you don't have or want control | |
368 | over it. | |
369 | ||
370 | endchoice | |
371 | ||
372 | config DMI | |
373 | bool "Enable DMI scanning" | |
374 | select DMI_SCAN_MACHINE_NON_EFI_FALLBACK | |
375 | default y | |
376 | help | |
377 | This enables SMBIOS/DMI feature for systems, and scanning of | |
378 | DMI to identify machine quirks. | |
379 | ||
380 | config EFI | |
381 | bool "EFI runtime service support" | |
382 | select UCS2_STRING | |
fa96b57c HC |
383 | select EFI_RUNTIME_WRAPPERS |
384 | help | |
385 | This enables the kernel to use EFI runtime services that are | |
386 | available (such as the EFI variable services). | |
387 | ||
ead384d9 HC |
388 | config EFI_STUB |
389 | bool "EFI boot stub support" | |
390 | default y | |
391 | depends on EFI | |
392 | select EFI_GENERIC_STUB | |
393 | help | |
394 | This kernel feature allows the kernel to be loaded directly by | |
395 | EFI firmware without the use of a bootloader. | |
396 | ||
f6f0c9a7 HC |
397 | config SCHED_SMT |
398 | bool "SMT scheduler support" | |
399 | default y | |
400 | help | |
401 | Improves scheduler's performance when there are multiple | |
402 | threads in one physical core. | |
403 | ||
46859ac8 HC |
404 | config SMP |
405 | bool "Multi-Processing support" | |
406 | help | |
407 | This enables support for systems with more than one CPU. If you have | |
408 | a system with only one CPU, say N. If you have a system with more | |
409 | than one CPU, say Y. | |
410 | ||
411 | If you say N here, the kernel will run on uni- and multiprocessor | |
412 | machines, but will use only one CPU of a multiprocessor machine. If | |
413 | you say Y here, the kernel will run on many, but not all, | |
414 | uniprocessor machines. On a uniprocessor machine, the kernel | |
415 | will run faster if you say N here. | |
416 | ||
417 | See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. | |
418 | ||
419 | If you don't know what to do here, say N. | |
420 | ||
421 | config HOTPLUG_CPU | |
422 | bool "Support for hot-pluggable CPUs" | |
423 | depends on SMP | |
424 | select GENERIC_IRQ_MIGRATION | |
425 | help | |
426 | Say Y here to allow turning CPUs off and on. CPUs can be | |
427 | controlled through /sys/devices/system/cpu. | |
428 | (Note: power management support will enable this option | |
429 | automatically on SMP systems. ) | |
430 | Say N if you want to disable CPU hotplug. | |
431 | ||
432 | config NR_CPUS | |
433 | int "Maximum number of CPUs (2-256)" | |
434 | range 2 256 | |
435 | depends on SMP | |
436 | default "64" | |
437 | help | |
438 | This allows you to specify the maximum number of CPUs which this | |
439 | kernel will support. | |
440 | ||
d4b6f156 HC |
441 | config NUMA |
442 | bool "NUMA Support" | |
255b4658 | 443 | select SMP |
d4b6f156 HC |
444 | select ACPI_NUMA if ACPI |
445 | help | |
446 | Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) | |
447 | support. This option improves performance on systems with more | |
448 | than one NUMA node; on single node systems it is generally better | |
449 | to leave it disabled. | |
450 | ||
451 | config NODES_SHIFT | |
452 | int | |
453 | default "6" | |
454 | depends on NUMA | |
455 | ||
0192445c | 456 | config ARCH_FORCE_MAX_ORDER |
fa96b57c | 457 | int "Maximum zone order" |
23baf831 | 458 | default "13" if PAGE_SIZE_64KB |
23baf831 | 459 | default "11" if PAGE_SIZE_16KB |
23baf831 | 460 | default "10" |
fa96b57c HC |
461 | help |
462 | The kernel memory allocator divides physically contiguous memory | |
463 | blocks into "zones", where each zone is a power of two number of | |
464 | pages. This option selects the largest power of two that the kernel | |
465 | keeps in the memory allocator. If you need to allocate very large | |
466 | blocks of physically contiguous memory, then you may need to | |
467 | increase this value. | |
468 | ||
fa96b57c HC |
469 | The page size is not necessarily 4KB. Keep this in mind |
470 | when choosing a value for this option. | |
471 | ||
d2791341 HC |
472 | config ARCH_IOREMAP |
473 | bool "Enable LoongArch DMW-based ioremap()" | |
474 | help | |
475 | We use generic TLB-based ioremap() by default since it has page | |
476 | protection support. However, you can enable LoongArch DMW-based | |
477 | ioremap() for better performance. | |
478 | ||
16c52e50 HC |
479 | config ARCH_WRITECOMBINE |
480 | bool "Enable WriteCombine (WUC) for ioremap()" | |
481 | help | |
482 | LoongArch maintains cache coherency in hardware, but when paired | |
483 | with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which | |
484 | is similar to WriteCombine) is out of the scope of cache coherency | |
485 | machanism for PCIe devices (this is a PCIe protocol violation, which | |
486 | may be fixed in newer chipsets). | |
487 | ||
488 | This means WUC can only used for write-only memory regions now, so | |
489 | this option is disabled by default, making WUC silently fallback to | |
490 | SUC for ioremap(). You can enable this option if the kernel is ensured | |
491 | to run on hardware without this bug. | |
492 | ||
493 | You can override this setting via writecombine=on/off boot parameter. | |
494 | ||
41596803 HC |
495 | config ARCH_STRICT_ALIGN |
496 | bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT | |
497 | default y | |
498 | help | |
499 | Not all LoongArch cores support h/w unaligned access, we can use | |
500 | -mstrict-align build parameter to prevent unaligned accesses. | |
501 | ||
502 | CPUs with h/w unaligned access support: | |
503 | Loongson-2K2000/2K3000/3A5000/3C5000/3D5000. | |
504 | ||
505 | CPUs without h/w unaligned access support: | |
506 | Loongson-2K500/2K1000. | |
507 | ||
508 | This option is enabled by default to make the kernel be able to run | |
509 | on all LoongArch systems. But you can disable it manually if you want | |
510 | to run kernel only on systems with h/w unaligned access support in | |
511 | order to optimise for performance. | |
512 | ||
61650023 HC |
513 | config CPU_HAS_FPU |
514 | bool | |
515 | default y | |
516 | ||
517 | config CPU_HAS_LSX | |
518 | bool "Support for the Loongson SIMD Extension" | |
519 | depends on AS_HAS_LSX_EXTENSION | |
520 | help | |
521 | Loongson SIMD Extension (LSX) introduces 128 bit wide vector registers | |
522 | and a set of SIMD instructions to operate on them. When this option | |
523 | is enabled the kernel will support allocating & switching LSX | |
524 | vector register contexts. If you know that your kernel will only be | |
525 | running on CPUs which do not support LSX or that your userland will | |
526 | not be making use of it then you may wish to say N here to reduce | |
527 | the size & complexity of your kernel. | |
528 | ||
529 | If unsure, say Y. | |
530 | ||
531 | config CPU_HAS_LASX | |
532 | bool "Support for the Loongson Advanced SIMD Extension" | |
533 | depends on CPU_HAS_LSX | |
534 | depends on AS_HAS_LASX_EXTENSION | |
535 | help | |
536 | Loongson Advanced SIMD Extension (LASX) introduces 256 bit wide vector | |
537 | registers and a set of SIMD instructions to operate on them. When this | |
538 | option is enabled the kernel will support allocating & switching LASX | |
539 | vector register contexts. If you know that your kernel will only be | |
540 | running on CPUs which do not support LASX or that your userland will | |
541 | not be making use of it then you may wish to say N here to reduce | |
542 | the size & complexity of your kernel. | |
543 | ||
544 | If unsure, say Y. | |
545 | ||
bd3c5798 QH |
546 | config CPU_HAS_LBT |
547 | bool "Support for the Loongson Binary Translation Extension" | |
548 | depends on AS_HAS_LBT_EXTENSION | |
549 | help | |
550 | Loongson Binary Translation (LBT) introduces 4 scratch registers (SCR0 | |
551 | to SCR3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop). | |
552 | Enabling this option allows the kernel to allocate and switch registers | |
553 | specific to LBT. | |
554 | ||
555 | If you want to use this feature, such as the Loongson Architecture | |
556 | Translator (LAT), say Y. | |
557 | ||
61650023 HC |
558 | config CPU_HAS_PREFETCH |
559 | bool | |
560 | default y | |
561 | ||
19e6dd0b ED |
562 | config ARCH_SUPPORTS_KEXEC |
563 | def_bool y | |
4a03b2ac | 564 | |
19e6dd0b ED |
565 | config ARCH_SUPPORTS_CRASH_DUMP |
566 | def_bool y | |
4a03b2ac | 567 | |
19e6dd0b ED |
568 | config ARCH_SELECTS_CRASH_DUMP |
569 | def_bool y | |
570 | depends on CRASH_DUMP | |
3f89765d | 571 | select RELOCATABLE |
4e62d1d8 | 572 | |
d8da19fb YT |
573 | config RELOCATABLE |
574 | bool "Relocatable kernel" | |
575 | help | |
576 | This builds the kernel as a Position Independent Executable (PIE), | |
577 | which retains all relocation metadata required, so as to relocate | |
578 | the kernel binary at runtime to a different virtual address from | |
579 | its link address. | |
580 | ||
e5f02b51 YT |
581 | config RANDOMIZE_BASE |
582 | bool "Randomize the address of the kernel (KASLR)" | |
583 | depends on RELOCATABLE | |
584 | help | |
585 | Randomizes the physical and virtual address at which the | |
586 | kernel image is loaded, as a security feature that | |
587 | deters exploit attempts relying on knowledge of the location | |
588 | of kernel internals. | |
589 | ||
590 | The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET. | |
591 | ||
592 | If unsure, say N. | |
593 | ||
594 | config RANDOMIZE_BASE_MAX_OFFSET | |
595 | hex "Maximum KASLR offset" if EXPERT | |
596 | depends on RANDOMIZE_BASE | |
597 | range 0x0 0x10000000 | |
598 | default "0x01000000" | |
599 | help | |
600 | When KASLR is active, this provides the maximum offset that will | |
601 | be applied to the kernel image. It should be set according to the | |
602 | amount of physical RAM available in the target system. | |
603 | ||
604 | This is limited by the size of the lower address memory, 256MB. | |
605 | ||
fa96b57c HC |
606 | config SECCOMP |
607 | bool "Enable seccomp to safely compute untrusted bytecode" | |
608 | depends on PROC_FS | |
609 | default y | |
610 | help | |
611 | This kernel feature is useful for number crunching applications | |
612 | that may need to compute untrusted bytecode during their | |
613 | execution. By using pipes or other transports made available to | |
614 | the process as file descriptors supporting the read/write | |
615 | syscalls, it's possible to isolate those applications in | |
616 | their own address space using seccomp. Once seccomp is | |
617 | enabled via /proc/<pid>/seccomp, it cannot be disabled | |
618 | and the task is only allowed to execute a few safe syscalls | |
619 | defined by each seccomp mode. | |
620 | ||
621 | If unsure, say Y. Only embedded should say N here. | |
622 | ||
623 | endmenu | |
624 | ||
625 | config ARCH_SELECT_MEMORY_MODEL | |
626 | def_bool y | |
627 | ||
628 | config ARCH_FLATMEM_ENABLE | |
629 | def_bool y | |
d4b6f156 | 630 | depends on !NUMA |
fa96b57c HC |
631 | |
632 | config ARCH_SPARSEMEM_ENABLE | |
633 | def_bool y | |
7b09f5af | 634 | select SPARSEMEM_VMEMMAP_ENABLE |
fa96b57c HC |
635 | help |
636 | Say Y to support efficient handling of sparse physical memory, | |
637 | for architectures which are either NUMA (Non-Uniform Memory Access) | |
638 | or have huge holes in the physical address space for other reasons. | |
ee65728e | 639 | See <file:Documentation/mm/numa.rst> for more. |
fa96b57c HC |
640 | |
641 | config ARCH_ENABLE_THP_MIGRATION | |
642 | def_bool y | |
643 | depends on TRANSPARENT_HUGEPAGE | |
644 | ||
645 | config ARCH_MEMORY_PROBE | |
646 | def_bool y | |
647 | depends on MEMORY_HOTPLUG | |
648 | ||
649 | config MMU | |
650 | bool | |
651 | default y | |
652 | ||
653 | config ARCH_MMAP_RND_BITS_MIN | |
654 | default 12 | |
655 | ||
656 | config ARCH_MMAP_RND_BITS_MAX | |
657 | default 18 | |
658 | ||
19bc6cb6 TY |
659 | config ARCH_SUPPORTS_UPROBES |
660 | def_bool y | |
661 | ||
5aa4ac64 QZ |
662 | config KASAN_SHADOW_OFFSET |
663 | hex | |
664 | default 0x0 | |
665 | depends on KASAN | |
666 | ||
fa96b57c HC |
667 | menu "Power management options" |
668 | ||
366bb35a HC |
669 | config ARCH_SUSPEND_POSSIBLE |
670 | def_bool y | |
671 | ||
7db54bfe HC |
672 | config ARCH_HIBERNATION_POSSIBLE |
673 | def_bool y | |
674 | ||
366bb35a | 675 | source "kernel/power/Kconfig" |
fa96b57c HC |
676 | source "drivers/acpi/Kconfig" |
677 | ||
678 | endmenu |