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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 | |
d4c937c2 | 13 | select ARCH_HAS_FORTIFY_SOURCE |
3f48f3d9 | 14 | select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS |
fa96b57c HC |
15 | select ARCH_HAS_PTE_SPECIAL |
16 | select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST | |
17 | select ARCH_INLINE_READ_LOCK if !PREEMPTION | |
18 | select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION | |
19 | select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION | |
20 | select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION | |
21 | select ARCH_INLINE_READ_UNLOCK if !PREEMPTION | |
22 | select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION | |
23 | select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION | |
24 | select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION | |
25 | select ARCH_INLINE_WRITE_LOCK if !PREEMPTION | |
26 | select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION | |
27 | select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION | |
28 | select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION | |
29 | select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION | |
30 | select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION | |
31 | select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION | |
32 | select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION | |
33 | select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION | |
34 | select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION | |
35 | select ARCH_INLINE_SPIN_LOCK if !PREEMPTION | |
36 | select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION | |
37 | select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION | |
38 | select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION | |
39 | select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION | |
40 | select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION | |
41 | select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION | |
42 | select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION | |
e0fba87c | 43 | select ARCH_KEEP_MEMBLOCK |
fa96b57c HC |
44 | select ARCH_MIGHT_HAVE_PC_PARPORT |
45 | select ARCH_MIGHT_HAVE_PC_SERIO | |
46 | select ARCH_SPARSEMEM_ENABLE | |
93a4fa62 | 47 | select ARCH_STACKWALK |
fa96b57c HC |
48 | select ARCH_SUPPORTS_ACPI |
49 | select ARCH_SUPPORTS_ATOMIC_RMW | |
50 | select ARCH_SUPPORTS_HUGETLBFS | |
d4b6f156 | 51 | select ARCH_SUPPORTS_NUMA_BALANCING |
fa96b57c HC |
52 | select ARCH_USE_BUILTIN_BSWAP |
53 | select ARCH_USE_CMPXCHG_LOCKREF | |
54 | select ARCH_USE_QUEUED_RWLOCKS | |
5f1e001b | 55 | select ARCH_USE_QUEUED_SPINLOCKS |
fa96b57c | 56 | select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT |
1429cfde | 57 | select ARCH_WANT_LD_ORPHAN_WARN |
0b376f1e | 58 | select ARCH_WANT_OPTIMIZE_VMEMMAP |
fa96b57c HC |
59 | select ARCH_WANTS_NO_INSTR |
60 | select BUILDTIME_TABLE_SORT | |
61 | select COMMON_CLK | |
366bb35a | 62 | select CPU_PM |
f30d1f49 | 63 | select EFI |
fa96b57c HC |
64 | select GENERIC_CLOCKEVENTS |
65 | select GENERIC_CMOS_UPDATE | |
66 | select GENERIC_CPU_AUTOPROBE | |
67 | select GENERIC_ENTRY | |
fa96b57c | 68 | select GENERIC_GETTIMEOFDAY |
d2791341 | 69 | select GENERIC_IOREMAP if !ARCH_IOREMAP |
fa96b57c HC |
70 | select GENERIC_IRQ_MULTI_HANDLER |
71 | select GENERIC_IRQ_PROBE | |
72 | select GENERIC_IRQ_SHOW | |
73 | select GENERIC_LIB_ASHLDI3 | |
74 | select GENERIC_LIB_ASHRDI3 | |
75 | select GENERIC_LIB_CMPDI2 | |
76 | select GENERIC_LIB_LSHRDI3 | |
77 | select GENERIC_LIB_UCMPDI2 | |
235d074f | 78 | select GENERIC_LIB_DEVMEM_IS_ALLOWED |
fa96b57c HC |
79 | select GENERIC_PCI_IOMAP |
80 | select GENERIC_SCHED_CLOCK | |
46859ac8 | 81 | select GENERIC_SMP_IDLE_THREAD |
fa96b57c HC |
82 | select GENERIC_TIME_VSYSCALL |
83 | select GPIOLIB | |
fcbfe812 | 84 | select HAS_IOPORT |
fa96b57c | 85 | select HAVE_ARCH_AUDITSYSCALL |
fa96b57c HC |
86 | select HAVE_ARCH_MMAP_RND_BITS if MMU |
87 | select HAVE_ARCH_SECCOMP_FILTER | |
88 | select HAVE_ARCH_TRACEHOOK | |
89 | select HAVE_ARCH_TRANSPARENT_HUGEPAGE | |
90 | select HAVE_ASM_MODVERSIONS | |
24a9c541 | 91 | select HAVE_CONTEXT_TRACKING_USER |
a0a458fb | 92 | select HAVE_C_RECORDMCOUNT |
fa96b57c HC |
93 | select HAVE_DEBUG_STACKOVERFLOW |
94 | select HAVE_DMA_CONTIGUOUS | |
4733f09d | 95 | select HAVE_DYNAMIC_FTRACE |
ac7127e1 | 96 | select HAVE_DYNAMIC_FTRACE_WITH_ARGS |
9cdc3b6a | 97 | select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS |
8778ba2c | 98 | select HAVE_DYNAMIC_FTRACE_WITH_REGS |
5dc61552 | 99 | select HAVE_EBPF_JIT |
41596803 | 100 | select HAVE_EFFICIENT_UNALIGNED_ACCESS if !ARCH_STRICT_ALIGN |
fa96b57c HC |
101 | select HAVE_EXIT_THREAD |
102 | select HAVE_FAST_GUP | |
a0a458fb | 103 | select HAVE_FTRACE_MCOUNT_RECORD |
356bd6f2 | 104 | select HAVE_FUNCTION_ARG_ACCESS_API |
8b5ee2c6 | 105 | select HAVE_FUNCTION_ERROR_INJECTION |
dbe3ba30 QZ |
106 | select HAVE_FUNCTION_GRAPH_TRACER |
107 | select HAVE_FUNCTION_TRACER | |
fa96b57c | 108 | select HAVE_GENERIC_VDSO |
edffa33c | 109 | select HAVE_HW_BREAKPOINT if PERF_EVENTS |
fa96b57c HC |
110 | select HAVE_IOREMAP_PROT |
111 | select HAVE_IRQ_EXIT_ON_IRQ_STACK | |
112 | select HAVE_IRQ_TIME_ACCOUNTING | |
6d4cc40f | 113 | select HAVE_KPROBES |
09e679c2 | 114 | select HAVE_KPROBES_ON_FTRACE |
3f553686 | 115 | select HAVE_KRETPROBES |
fa96b57c HC |
116 | select HAVE_MOD_ARCH_SPECIFIC |
117 | select HAVE_NMI | |
57fc7323 | 118 | select HAVE_PCI |
fa96b57c | 119 | select HAVE_PERF_EVENTS |
b37042b2 HC |
120 | select HAVE_PERF_REGS |
121 | select HAVE_PERF_USER_STACK_DUMP | |
fa96b57c HC |
122 | select HAVE_REGS_AND_STACK_ACCESS_API |
123 | select HAVE_RSEQ | |
22f367a6 YT |
124 | select HAVE_SAMPLE_FTRACE_DIRECT |
125 | select HAVE_SAMPLE_FTRACE_DIRECT_MULTI | |
d4b6f156 | 126 | select HAVE_SETUP_PER_CPU_AREA if NUMA |
09f33601 | 127 | select HAVE_STACKPROTECTOR |
fa96b57c HC |
128 | select HAVE_SYSCALL_TRACEPOINTS |
129 | select HAVE_TIF_NOHZ | |
46859ac8 | 130 | select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP |
fa96b57c HC |
131 | select IRQ_FORCED_THREADING |
132 | select IRQ_LOONGARCH_CPU | |
f30d1f49 | 133 | select MMU_GATHER_MERGE_VMAS if MMU |
fa96b57c | 134 | select MODULES_USE_ELF_RELA if MODULES |
d4b6f156 HC |
135 | select NEED_PER_CPU_EMBED_FIRST_CHUNK |
136 | select NEED_PER_CPU_PAGE_FIRST_CHUNK | |
88d4d957 BZ |
137 | select OF |
138 | select OF_EARLY_FLATTREE | |
57fc7323 HC |
139 | select PCI |
140 | select PCI_DOMAINS_GENERIC | |
141 | select PCI_ECAM if ACPI | |
142 | select PCI_LOONGSON | |
143 | select PCI_MSI_ARCH_FALLBACKS | |
7c12bb8f | 144 | select PCI_QUIRKS |
fa96b57c HC |
145 | select PERF_USE_VMALLOC |
146 | select RTC_LIB | |
f30d1f49 | 147 | select SMP |
fa96b57c | 148 | select SPARSE_IRQ |
61a6fccc HC |
149 | select SYSCTL_ARCH_UNALIGN_ALLOW |
150 | select SYSCTL_ARCH_UNALIGN_NO_WARN | |
fa96b57c HC |
151 | select SYSCTL_EXCEPTION_TRACE |
152 | select SWIOTLB | |
153 | select TRACE_IRQFLAGS_SUPPORT | |
d4b6f156 | 154 | select USE_PERCPU_NUMA_NODE_ID |
4d7bf939 | 155 | select USER_STACKTRACE_SUPPORT |
fa96b57c HC |
156 | select ZONE_DMA32 |
157 | ||
158 | config 32BIT | |
159 | bool | |
160 | ||
161 | config 64BIT | |
162 | def_bool y | |
163 | ||
164 | config CPU_HAS_FPU | |
165 | bool | |
166 | default y | |
167 | ||
168 | config CPU_HAS_PREFETCH | |
169 | bool | |
170 | default y | |
171 | ||
2d2c3952 YT |
172 | config GENERIC_BUG |
173 | def_bool y | |
174 | depends on BUG | |
175 | ||
176 | config GENERIC_BUG_RELATIVE_POINTERS | |
177 | def_bool y | |
178 | depends on GENERIC_BUG | |
179 | ||
fa96b57c HC |
180 | config GENERIC_CALIBRATE_DELAY |
181 | def_bool y | |
182 | ||
183 | config GENERIC_CSUM | |
184 | def_bool y | |
185 | ||
186 | config GENERIC_HWEIGHT | |
187 | def_bool y | |
188 | ||
189 | config L1_CACHE_SHIFT | |
190 | int | |
191 | default "6" | |
192 | ||
193 | config LOCKDEP_SUPPORT | |
194 | bool | |
93a4fa62 QZ |
195 | default y |
196 | ||
197 | config STACKTRACE_SUPPORT | |
198 | bool | |
fa96b57c HC |
199 | default y |
200 | ||
9550dfde | 201 | # MACH_LOONGSON32 and MACH_LOONGSON64 are deliberately carried over from the |
fa96b57c HC |
202 | # MIPS Loongson code, to preserve Loongson-specific code paths in drivers that |
203 | # are shared between architectures, and specifically expecting the symbols. | |
204 | config MACH_LOONGSON32 | |
205 | def_bool 32BIT | |
206 | ||
207 | config MACH_LOONGSON64 | |
208 | def_bool 64BIT | |
209 | ||
d2791341 HC |
210 | config FIX_EARLYCON_MEM |
211 | def_bool y | |
212 | ||
fa96b57c HC |
213 | config PAGE_SIZE_4KB |
214 | bool | |
215 | ||
216 | config PAGE_SIZE_16KB | |
217 | bool | |
218 | ||
219 | config PAGE_SIZE_64KB | |
220 | bool | |
221 | ||
222 | config PGTABLE_2LEVEL | |
223 | bool | |
224 | ||
225 | config PGTABLE_3LEVEL | |
226 | bool | |
227 | ||
228 | config PGTABLE_4LEVEL | |
229 | bool | |
230 | ||
231 | config PGTABLE_LEVELS | |
232 | int | |
233 | default 2 if PGTABLE_2LEVEL | |
234 | default 3 if PGTABLE_3LEVEL | |
235 | default 4 if PGTABLE_4LEVEL | |
236 | ||
237 | config SCHED_OMIT_FRAME_POINTER | |
238 | bool | |
239 | default y | |
240 | ||
0d8dad70 XR |
241 | config AS_HAS_EXPLICIT_RELOCS |
242 | def_bool $(as-instr,x:pcalau12i \$t0$(comma)%pc_hi20(x)) | |
243 | ||
fa96b57c HC |
244 | menu "Kernel type and options" |
245 | ||
246 | source "kernel/Kconfig.hz" | |
247 | ||
248 | choice | |
249 | prompt "Page Table Layout" | |
250 | default 16KB_2LEVEL if 32BIT | |
251 | default 16KB_3LEVEL if 64BIT | |
252 | help | |
253 | Allows choosing the page table layout, which is a combination | |
254 | of page size and page table levels. The size of virtual memory | |
255 | address space are determined by the page table layout. | |
256 | ||
257 | config 4KB_3LEVEL | |
258 | bool "4KB with 3 levels" | |
259 | select PAGE_SIZE_4KB | |
260 | select PGTABLE_3LEVEL | |
261 | help | |
262 | This option selects 4KB page size with 3 level page tables, which | |
263 | support a maximum of 39 bits of application virtual memory. | |
264 | ||
265 | config 4KB_4LEVEL | |
266 | bool "4KB with 4 levels" | |
267 | select PAGE_SIZE_4KB | |
268 | select PGTABLE_4LEVEL | |
269 | help | |
270 | This option selects 4KB page size with 4 level page tables, which | |
271 | support a maximum of 48 bits of application virtual memory. | |
272 | ||
273 | config 16KB_2LEVEL | |
274 | bool "16KB with 2 levels" | |
275 | select PAGE_SIZE_16KB | |
276 | select PGTABLE_2LEVEL | |
277 | help | |
278 | This option selects 16KB page size with 2 level page tables, which | |
279 | support a maximum of 36 bits of application virtual memory. | |
280 | ||
281 | config 16KB_3LEVEL | |
282 | bool "16KB with 3 levels" | |
283 | select PAGE_SIZE_16KB | |
284 | select PGTABLE_3LEVEL | |
285 | help | |
286 | This option selects 16KB page size with 3 level page tables, which | |
287 | support a maximum of 47 bits of application virtual memory. | |
288 | ||
289 | config 64KB_2LEVEL | |
290 | bool "64KB with 2 levels" | |
291 | select PAGE_SIZE_64KB | |
292 | select PGTABLE_2LEVEL | |
293 | help | |
294 | This option selects 64KB page size with 2 level page tables, which | |
295 | support a maximum of 42 bits of application virtual memory. | |
296 | ||
297 | config 64KB_3LEVEL | |
298 | bool "64KB with 3 levels" | |
299 | select PAGE_SIZE_64KB | |
300 | select PGTABLE_3LEVEL | |
301 | help | |
302 | This option selects 64KB page size with 3 level page tables, which | |
303 | support a maximum of 55 bits of application virtual memory. | |
304 | ||
305 | endchoice | |
306 | ||
307 | config CMDLINE | |
308 | string "Built-in kernel command line" | |
309 | help | |
310 | For most platforms, the arguments for the kernel's command line | |
311 | are provided at run-time, during boot. However, there are cases | |
312 | where either no arguments are being provided or the provided | |
313 | arguments are insufficient or even invalid. | |
314 | ||
315 | When that occurs, it is possible to define a built-in command | |
316 | line here and choose how the kernel should use it later on. | |
317 | ||
318 | choice | |
319 | prompt "Kernel command line type" | |
320 | default CMDLINE_BOOTLOADER | |
321 | help | |
322 | Choose how the kernel will handle the provided built-in command | |
323 | line. | |
324 | ||
325 | config CMDLINE_BOOTLOADER | |
326 | bool "Use bootloader kernel arguments if available" | |
327 | help | |
328 | Prefer the command-line passed by the boot loader if available. | |
329 | Use the built-in command line as fallback in case we get nothing | |
330 | during boot. This is the default behaviour. | |
331 | ||
332 | config CMDLINE_EXTEND | |
333 | bool "Use built-in to extend bootloader kernel arguments" | |
334 | help | |
335 | The command-line arguments provided during boot will be | |
336 | appended to the built-in command line. This is useful in | |
337 | cases where the provided arguments are insufficient and | |
338 | you don't want to or cannot modify them. | |
339 | ||
340 | config CMDLINE_FORCE | |
341 | bool "Always use the built-in kernel command string" | |
342 | help | |
343 | Always use the built-in command line, even if we get one during | |
344 | boot. This is useful in case you need to override the provided | |
345 | command line on systems where you don't have or want control | |
346 | over it. | |
347 | ||
348 | endchoice | |
349 | ||
350 | config DMI | |
351 | bool "Enable DMI scanning" | |
352 | select DMI_SCAN_MACHINE_NON_EFI_FALLBACK | |
353 | default y | |
354 | help | |
355 | This enables SMBIOS/DMI feature for systems, and scanning of | |
356 | DMI to identify machine quirks. | |
357 | ||
358 | config EFI | |
359 | bool "EFI runtime service support" | |
360 | select UCS2_STRING | |
fa96b57c HC |
361 | select EFI_RUNTIME_WRAPPERS |
362 | help | |
363 | This enables the kernel to use EFI runtime services that are | |
364 | available (such as the EFI variable services). | |
365 | ||
ead384d9 HC |
366 | config EFI_STUB |
367 | bool "EFI boot stub support" | |
368 | default y | |
369 | depends on EFI | |
370 | select EFI_GENERIC_STUB | |
371 | help | |
372 | This kernel feature allows the kernel to be loaded directly by | |
373 | EFI firmware without the use of a bootloader. | |
374 | ||
46859ac8 HC |
375 | config SMP |
376 | bool "Multi-Processing support" | |
377 | help | |
378 | This enables support for systems with more than one CPU. If you have | |
379 | a system with only one CPU, say N. If you have a system with more | |
380 | than one CPU, say Y. | |
381 | ||
382 | If you say N here, the kernel will run on uni- and multiprocessor | |
383 | machines, but will use only one CPU of a multiprocessor machine. If | |
384 | you say Y here, the kernel will run on many, but not all, | |
385 | uniprocessor machines. On a uniprocessor machine, the kernel | |
386 | will run faster if you say N here. | |
387 | ||
388 | See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. | |
389 | ||
390 | If you don't know what to do here, say N. | |
391 | ||
392 | config HOTPLUG_CPU | |
393 | bool "Support for hot-pluggable CPUs" | |
394 | depends on SMP | |
395 | select GENERIC_IRQ_MIGRATION | |
396 | help | |
397 | Say Y here to allow turning CPUs off and on. CPUs can be | |
398 | controlled through /sys/devices/system/cpu. | |
399 | (Note: power management support will enable this option | |
400 | automatically on SMP systems. ) | |
401 | Say N if you want to disable CPU hotplug. | |
402 | ||
403 | config NR_CPUS | |
404 | int "Maximum number of CPUs (2-256)" | |
405 | range 2 256 | |
406 | depends on SMP | |
407 | default "64" | |
408 | help | |
409 | This allows you to specify the maximum number of CPUs which this | |
410 | kernel will support. | |
411 | ||
d4b6f156 HC |
412 | config NUMA |
413 | bool "NUMA Support" | |
255b4658 | 414 | select SMP |
d4b6f156 HC |
415 | select ACPI_NUMA if ACPI |
416 | help | |
417 | Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) | |
418 | support. This option improves performance on systems with more | |
419 | than one NUMA node; on single node systems it is generally better | |
420 | to leave it disabled. | |
421 | ||
422 | config NODES_SHIFT | |
423 | int | |
424 | default "6" | |
425 | depends on NUMA | |
426 | ||
0192445c | 427 | config ARCH_FORCE_MAX_ORDER |
fa96b57c | 428 | int "Maximum zone order" |
23baf831 | 429 | default "13" if PAGE_SIZE_64KB |
23baf831 | 430 | default "11" if PAGE_SIZE_16KB |
23baf831 | 431 | default "10" |
fa96b57c HC |
432 | help |
433 | The kernel memory allocator divides physically contiguous memory | |
434 | blocks into "zones", where each zone is a power of two number of | |
435 | pages. This option selects the largest power of two that the kernel | |
436 | keeps in the memory allocator. If you need to allocate very large | |
437 | blocks of physically contiguous memory, then you may need to | |
438 | increase this value. | |
439 | ||
fa96b57c HC |
440 | The page size is not necessarily 4KB. Keep this in mind |
441 | when choosing a value for this option. | |
442 | ||
d2791341 HC |
443 | config ARCH_IOREMAP |
444 | bool "Enable LoongArch DMW-based ioremap()" | |
445 | help | |
446 | We use generic TLB-based ioremap() by default since it has page | |
447 | protection support. However, you can enable LoongArch DMW-based | |
448 | ioremap() for better performance. | |
449 | ||
16c52e50 HC |
450 | config ARCH_WRITECOMBINE |
451 | bool "Enable WriteCombine (WUC) for ioremap()" | |
452 | help | |
453 | LoongArch maintains cache coherency in hardware, but when paired | |
454 | with LS7A chipsets the WUC attribute (Weak-ordered UnCached, which | |
455 | is similar to WriteCombine) is out of the scope of cache coherency | |
456 | machanism for PCIe devices (this is a PCIe protocol violation, which | |
457 | may be fixed in newer chipsets). | |
458 | ||
459 | This means WUC can only used for write-only memory regions now, so | |
460 | this option is disabled by default, making WUC silently fallback to | |
461 | SUC for ioremap(). You can enable this option if the kernel is ensured | |
462 | to run on hardware without this bug. | |
463 | ||
464 | You can override this setting via writecombine=on/off boot parameter. | |
465 | ||
41596803 HC |
466 | config ARCH_STRICT_ALIGN |
467 | bool "Enable -mstrict-align to prevent unaligned accesses" if EXPERT | |
468 | default y | |
469 | help | |
470 | Not all LoongArch cores support h/w unaligned access, we can use | |
471 | -mstrict-align build parameter to prevent unaligned accesses. | |
472 | ||
473 | CPUs with h/w unaligned access support: | |
474 | Loongson-2K2000/2K3000/3A5000/3C5000/3D5000. | |
475 | ||
476 | CPUs without h/w unaligned access support: | |
477 | Loongson-2K500/2K1000. | |
478 | ||
479 | This option is enabled by default to make the kernel be able to run | |
480 | on all LoongArch systems. But you can disable it manually if you want | |
481 | to run kernel only on systems with h/w unaligned access support in | |
482 | order to optimise for performance. | |
483 | ||
4a03b2ac YT |
484 | config KEXEC |
485 | bool "Kexec system call" | |
486 | select KEXEC_CORE | |
487 | help | |
488 | kexec is a system call that implements the ability to shutdown your | |
489 | current kernel, and to start another kernel. It is like a reboot | |
490 | but it is independent of the system firmware. And like a reboot | |
491 | you can start any kernel with it, not just Linux. | |
492 | ||
493 | The name comes from the similarity to the exec system call. | |
494 | ||
4e62d1d8 YT |
495 | config CRASH_DUMP |
496 | bool "Build kdump crash kernel" | |
3f89765d | 497 | select RELOCATABLE |
4e62d1d8 YT |
498 | help |
499 | Generate crash dump after being started by kexec. This should | |
500 | be normally only set in special crash dump kernels which are | |
501 | loaded in the main kernel with kexec-tools into a specially | |
502 | reserved region and then later executed after a crash by | |
503 | kdump/kexec. | |
504 | ||
505 | For more details see Documentation/admin-guide/kdump/kdump.rst | |
506 | ||
d8da19fb YT |
507 | config RELOCATABLE |
508 | bool "Relocatable kernel" | |
509 | help | |
510 | This builds the kernel as a Position Independent Executable (PIE), | |
511 | which retains all relocation metadata required, so as to relocate | |
512 | the kernel binary at runtime to a different virtual address from | |
513 | its link address. | |
514 | ||
e5f02b51 YT |
515 | config RANDOMIZE_BASE |
516 | bool "Randomize the address of the kernel (KASLR)" | |
517 | depends on RELOCATABLE | |
518 | help | |
519 | Randomizes the physical and virtual address at which the | |
520 | kernel image is loaded, as a security feature that | |
521 | deters exploit attempts relying on knowledge of the location | |
522 | of kernel internals. | |
523 | ||
524 | The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET. | |
525 | ||
526 | If unsure, say N. | |
527 | ||
528 | config RANDOMIZE_BASE_MAX_OFFSET | |
529 | hex "Maximum KASLR offset" if EXPERT | |
530 | depends on RANDOMIZE_BASE | |
531 | range 0x0 0x10000000 | |
532 | default "0x01000000" | |
533 | help | |
534 | When KASLR is active, this provides the maximum offset that will | |
535 | be applied to the kernel image. It should be set according to the | |
536 | amount of physical RAM available in the target system. | |
537 | ||
538 | This is limited by the size of the lower address memory, 256MB. | |
539 | ||
fa96b57c HC |
540 | config SECCOMP |
541 | bool "Enable seccomp to safely compute untrusted bytecode" | |
542 | depends on PROC_FS | |
543 | default y | |
544 | help | |
545 | This kernel feature is useful for number crunching applications | |
546 | that may need to compute untrusted bytecode during their | |
547 | execution. By using pipes or other transports made available to | |
548 | the process as file descriptors supporting the read/write | |
549 | syscalls, it's possible to isolate those applications in | |
550 | their own address space using seccomp. Once seccomp is | |
551 | enabled via /proc/<pid>/seccomp, it cannot be disabled | |
552 | and the task is only allowed to execute a few safe syscalls | |
553 | defined by each seccomp mode. | |
554 | ||
555 | If unsure, say Y. Only embedded should say N here. | |
556 | ||
557 | endmenu | |
558 | ||
559 | config ARCH_SELECT_MEMORY_MODEL | |
560 | def_bool y | |
561 | ||
562 | config ARCH_FLATMEM_ENABLE | |
563 | def_bool y | |
d4b6f156 | 564 | depends on !NUMA |
fa96b57c HC |
565 | |
566 | config ARCH_SPARSEMEM_ENABLE | |
567 | def_bool y | |
7b09f5af | 568 | select SPARSEMEM_VMEMMAP_ENABLE |
fa96b57c HC |
569 | help |
570 | Say Y to support efficient handling of sparse physical memory, | |
571 | for architectures which are either NUMA (Non-Uniform Memory Access) | |
572 | or have huge holes in the physical address space for other reasons. | |
ee65728e | 573 | See <file:Documentation/mm/numa.rst> for more. |
fa96b57c HC |
574 | |
575 | config ARCH_ENABLE_THP_MIGRATION | |
576 | def_bool y | |
577 | depends on TRANSPARENT_HUGEPAGE | |
578 | ||
579 | config ARCH_MEMORY_PROBE | |
580 | def_bool y | |
581 | depends on MEMORY_HOTPLUG | |
582 | ||
583 | config MMU | |
584 | bool | |
585 | default y | |
586 | ||
587 | config ARCH_MMAP_RND_BITS_MIN | |
588 | default 12 | |
589 | ||
590 | config ARCH_MMAP_RND_BITS_MAX | |
591 | default 18 | |
592 | ||
593 | menu "Power management options" | |
594 | ||
366bb35a HC |
595 | config ARCH_SUSPEND_POSSIBLE |
596 | def_bool y | |
597 | ||
7db54bfe HC |
598 | config ARCH_HIBERNATION_POSSIBLE |
599 | def_bool y | |
600 | ||
366bb35a | 601 | source "kernel/power/Kconfig" |
fa96b57c HC |
602 | source "drivers/acpi/Kconfig" |
603 | ||
604 | endmenu | |
605 | ||
606 | source "drivers/firmware/Kconfig" |