]>
Commit | Line | Data |
---|---|---|
daa93fab SR |
1 | # Select 32 or 64 bit |
2 | config 64BIT | |
6840999b | 3 | bool "64-bit kernel" if ARCH = "x86" |
ffee0de4 | 4 | default ARCH != "i386" |
8f9ca475 | 5 | ---help--- |
daa93fab SR |
6 | Say yes to build a 64-bit kernel - formerly known as x86_64 |
7 | Say no to build a 32-bit kernel - formerly known as i386 | |
8 | ||
9 | config X86_32 | |
3120e25e JB |
10 | def_bool y |
11 | depends on !64BIT | |
daa93fab SR |
12 | |
13 | config X86_64 | |
3120e25e JB |
14 | def_bool y |
15 | depends on 64BIT | |
1032c0ba SR |
16 | |
17 | ### Arch settings | |
8d5fffb9 | 18 | config X86 |
3c2362e6 | 19 | def_bool y |
6471b825 IM |
20 | select ACPI_LEGACY_TABLES_LOOKUP if ACPI |
21 | select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI | |
22 | select ANON_INODES | |
23 | select ARCH_CLOCKSOURCE_DATA | |
24 | select ARCH_DISCARD_MEMBLOCK | |
25 | select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE | |
446f24d1 | 26 | select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS |
21266be9 | 27 | select ARCH_HAS_DEVMEM_IS_ALLOWED |
6471b825 | 28 | select ARCH_HAS_ELF_RANDOMIZE |
72d93104 | 29 | select ARCH_HAS_FAST_MULTIPLIER |
957e3fac | 30 | select ARCH_HAS_GCOV_PROFILE_ALL |
5c9a8750 | 31 | select ARCH_HAS_KCOV if X86_64 |
96601adb | 32 | select ARCH_HAS_PMEM_API if X86_64 |
67a3e8fe | 33 | select ARCH_HAS_MMIO_FLUSH |
6471b825 | 34 | select ARCH_HAS_SG_CHAIN |
c6d30853 | 35 | select ARCH_HAS_UBSAN_SANITIZE_ALL |
6471b825 IM |
36 | select ARCH_HAVE_NMI_SAFE_CMPXCHG |
37 | select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI | |
77fbbc81 | 38 | select ARCH_MIGHT_HAVE_PC_PARPORT |
5e2c18c0 | 39 | select ARCH_MIGHT_HAVE_PC_SERIO |
6471b825 | 40 | select ARCH_SUPPORTS_ATOMIC_RMW |
3b242c66 | 41 | select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT |
6471b825 IM |
42 | select ARCH_SUPPORTS_INT128 if X86_64 |
43 | select ARCH_SUPPORTS_NUMA_BALANCING if X86_64 | |
44 | select ARCH_USE_BUILTIN_BSWAP | |
45 | select ARCH_USE_CMPXCHG_LOCKREF if X86_64 | |
46 | select ARCH_USE_QUEUED_RWLOCKS | |
47 | select ARCH_USE_QUEUED_SPINLOCKS | |
72b252ae | 48 | select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH if SMP |
5aaeb5c0 | 49 | select ARCH_WANTS_DYNAMIC_TASK_STRUCT |
da4276b8 | 50 | select ARCH_WANT_FRAME_POINTERS |
6471b825 IM |
51 | select ARCH_WANT_IPC_PARSE_VERSION if X86_32 |
52 | select ARCH_WANT_OPTIONAL_GPIOLIB | |
53 | select BUILDTIME_EXTABLE_SORT | |
54 | select CLKEVT_I8253 | |
55 | select CLKSRC_I8253 if X86_32 | |
56 | select CLOCKSOURCE_VALIDATE_LAST_CYCLE | |
57 | select CLOCKSOURCE_WATCHDOG | |
58 | select CLONE_BACKWARDS if X86_32 | |
59 | select COMPAT_OLD_SIGACTION if IA32_EMULATION | |
60 | select DCACHE_WORD_ACCESS | |
45471cd9 LT |
61 | select EDAC_ATOMIC_SCRUB |
62 | select EDAC_SUPPORT | |
6471b825 IM |
63 | select GENERIC_CLOCKEVENTS |
64 | select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) | |
65 | select GENERIC_CLOCKEVENTS_MIN_ADJUST | |
66 | select GENERIC_CMOS_UPDATE | |
67 | select GENERIC_CPU_AUTOPROBE | |
5b7c73e0 | 68 | select GENERIC_EARLY_IOREMAP |
6471b825 IM |
69 | select GENERIC_FIND_FIRST_BIT |
70 | select GENERIC_IOMAP | |
71 | select GENERIC_IRQ_PROBE | |
72 | select GENERIC_IRQ_SHOW | |
73 | select GENERIC_PENDING_IRQ if SMP | |
74 | select GENERIC_SMP_IDLE_THREAD | |
75 | select GENERIC_STRNCPY_FROM_USER | |
76 | select GENERIC_STRNLEN_USER | |
77 | select GENERIC_TIME_VSYSCALL | |
78 | select HAVE_ACPI_APEI if ACPI | |
79 | select HAVE_ACPI_APEI_NMI if ACPI | |
80 | select HAVE_ALIGNED_STRUCT_PAGE if SLUB | |
81 | select HAVE_AOUT if X86_32 | |
82 | select HAVE_ARCH_AUDITSYSCALL | |
83 | select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE | |
84 | select HAVE_ARCH_JUMP_LABEL | |
85 | select HAVE_ARCH_KASAN if X86_64 && SPARSEMEM_VMEMMAP | |
86 | select HAVE_ARCH_KGDB | |
87 | select HAVE_ARCH_KMEMCHECK | |
9e08f57d DC |
88 | select HAVE_ARCH_MMAP_RND_BITS if MMU |
89 | select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT | |
6471b825 IM |
90 | select HAVE_ARCH_SECCOMP_FILTER |
91 | select HAVE_ARCH_SOFT_DIRTY if X86_64 | |
92 | select HAVE_ARCH_TRACEHOOK | |
93 | select HAVE_ARCH_TRANSPARENT_HUGEPAGE | |
6077776b | 94 | select HAVE_EBPF_JIT if X86_64 |
6471b825 IM |
95 | select HAVE_CC_STACKPROTECTOR |
96 | select HAVE_CMPXCHG_DOUBLE | |
97 | select HAVE_CMPXCHG_LOCAL | |
98 | select HAVE_CONTEXT_TRACKING if X86_64 | |
c1bd55f9 | 99 | select HAVE_COPY_THREAD_TLS |
cf4db259 | 100 | select HAVE_C_RECORDMCOUNT |
6471b825 IM |
101 | select HAVE_DEBUG_KMEMLEAK |
102 | select HAVE_DEBUG_STACKOVERFLOW | |
103 | select HAVE_DMA_API_DEBUG | |
6471b825 | 104 | select HAVE_DMA_CONTIGUOUS |
677aa9f7 | 105 | select HAVE_DYNAMIC_FTRACE |
06aeaaea | 106 | select HAVE_DYNAMIC_FTRACE_WITH_REGS |
58340a07 | 107 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
5f56a5df | 108 | select HAVE_EXIT_THREAD |
6471b825 IM |
109 | select HAVE_FENTRY if X86_64 |
110 | select HAVE_FTRACE_MCOUNT_RECORD | |
111 | select HAVE_FUNCTION_GRAPH_FP_TEST | |
112 | select HAVE_FUNCTION_GRAPH_TRACER | |
113 | select HAVE_FUNCTION_TRACER | |
114 | select HAVE_GENERIC_DMA_COHERENT if X86_32 | |
115 | select HAVE_HW_BREAKPOINT | |
116 | select HAVE_IDE | |
117 | select HAVE_IOREMAP_PROT | |
118 | select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64 | |
119 | select HAVE_IRQ_TIME_ACCOUNTING | |
2e9f3bdd | 120 | select HAVE_KERNEL_BZIP2 |
6471b825 IM |
121 | select HAVE_KERNEL_GZIP |
122 | select HAVE_KERNEL_LZ4 | |
2e9f3bdd | 123 | select HAVE_KERNEL_LZMA |
13510997 | 124 | select HAVE_KERNEL_LZO |
6471b825 IM |
125 | select HAVE_KERNEL_XZ |
126 | select HAVE_KPROBES | |
127 | select HAVE_KPROBES_ON_FTRACE | |
128 | select HAVE_KRETPROBES | |
129 | select HAVE_KVM | |
130 | select HAVE_LIVEPATCH if X86_64 | |
131 | select HAVE_MEMBLOCK | |
132 | select HAVE_MEMBLOCK_NODE_MAP | |
0102752e | 133 | select HAVE_MIXED_BREAKPOINTS_REGS |
42a0bb3f | 134 | select HAVE_NMI |
6471b825 IM |
135 | select HAVE_OPROFILE |
136 | select HAVE_OPTPROBES | |
137 | select HAVE_PCSPKR_PLATFORM | |
138 | select HAVE_PERF_EVENTS | |
c01d4323 | 139 | select HAVE_PERF_EVENTS_NMI |
c5e63197 | 140 | select HAVE_PERF_REGS |
c5ebcedb | 141 | select HAVE_PERF_USER_STACK_DUMP |
6471b825 IM |
142 | select HAVE_REGS_AND_STACK_ACCESS_API |
143 | select HAVE_SYSCALL_TRACEPOINTS | |
0c3619ea | 144 | select HAVE_UID16 if X86_32 || IA32_EMULATION |
6471b825 | 145 | select HAVE_UNSTABLE_SCHED_CLOCK |
7c68af6e | 146 | select HAVE_USER_RETURN_NOTIFIER |
c0185808 | 147 | select IRQ_FORCED_THREADING |
6471b825 IM |
148 | select MODULES_USE_ELF_RELA if X86_64 |
149 | select MODULES_USE_ELF_REL if X86_32 | |
150 | select OLD_SIGACTION if X86_32 | |
151 | select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION | |
152 | select PERF_EVENTS | |
3195ef59 | 153 | select RTC_LIB |
6471b825 | 154 | select SPARSE_IRQ |
83fe27ea | 155 | select SRCU |
6471b825 IM |
156 | select SYSCTL_EXCEPTION_TRACE |
157 | select USER_STACKTRACE_SUPPORT | |
158 | select VIRT_TO_BUS | |
159 | select X86_DEV_DMA_OPS if X86_64 | |
160 | select X86_FEATURE_NAMES if PROC_FS | |
d4883d5d | 161 | select HAVE_STACK_VALIDATION if X86_64 |
63c17fb8 | 162 | select ARCH_USES_HIGH_VMA_FLAGS if X86_INTEL_MEMORY_PROTECTION_KEYS |
66d37570 | 163 | select ARCH_HAS_PKEYS if X86_INTEL_MEMORY_PROTECTION_KEYS |
7d8330a5 | 164 | |
ba7e4d13 | 165 | config INSTRUCTION_DECODER |
3120e25e JB |
166 | def_bool y |
167 | depends on KPROBES || PERF_EVENTS || UPROBES | |
ba7e4d13 | 168 | |
51b26ada LT |
169 | config OUTPUT_FORMAT |
170 | string | |
171 | default "elf32-i386" if X86_32 | |
172 | default "elf64-x86-64" if X86_64 | |
173 | ||
73531905 | 174 | config ARCH_DEFCONFIG |
b9b39bfb | 175 | string |
73531905 SR |
176 | default "arch/x86/configs/i386_defconfig" if X86_32 |
177 | default "arch/x86/configs/x86_64_defconfig" if X86_64 | |
b9b39bfb | 178 | |
8d5fffb9 | 179 | config LOCKDEP_SUPPORT |
3c2362e6 | 180 | def_bool y |
8d5fffb9 SR |
181 | |
182 | config STACKTRACE_SUPPORT | |
3c2362e6 | 183 | def_bool y |
8d5fffb9 | 184 | |
8d5fffb9 | 185 | config MMU |
3c2362e6 | 186 | def_bool y |
8d5fffb9 | 187 | |
9e08f57d DC |
188 | config ARCH_MMAP_RND_BITS_MIN |
189 | default 28 if 64BIT | |
190 | default 8 | |
191 | ||
192 | config ARCH_MMAP_RND_BITS_MAX | |
193 | default 32 if 64BIT | |
194 | default 16 | |
195 | ||
196 | config ARCH_MMAP_RND_COMPAT_BITS_MIN | |
197 | default 8 | |
198 | ||
199 | config ARCH_MMAP_RND_COMPAT_BITS_MAX | |
200 | default 16 | |
201 | ||
8d5fffb9 SR |
202 | config SBUS |
203 | bool | |
204 | ||
3bc4e459 | 205 | config NEED_DMA_MAP_STATE |
3120e25e | 206 | def_bool y |
a6dfa128 | 207 | depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG || SWIOTLB |
3bc4e459 | 208 | |
18e98307 | 209 | config NEED_SG_DMA_LENGTH |
4a14d84e | 210 | def_bool y |
18e98307 | 211 | |
8d5fffb9 | 212 | config GENERIC_ISA_DMA |
3120e25e JB |
213 | def_bool y |
214 | depends on ISA_DMA_API | |
8d5fffb9 | 215 | |
8d5fffb9 | 216 | config GENERIC_BUG |
3c2362e6 | 217 | def_bool y |
8d5fffb9 | 218 | depends on BUG |
b93a531e JB |
219 | select GENERIC_BUG_RELATIVE_POINTERS if X86_64 |
220 | ||
221 | config GENERIC_BUG_RELATIVE_POINTERS | |
222 | bool | |
8d5fffb9 SR |
223 | |
224 | config GENERIC_HWEIGHT | |
3c2362e6 | 225 | def_bool y |
8d5fffb9 SR |
226 | |
227 | config ARCH_MAY_HAVE_PC_FDC | |
3120e25e JB |
228 | def_bool y |
229 | depends on ISA_DMA_API | |
8d5fffb9 | 230 | |
1032c0ba | 231 | config RWSEM_XCHGADD_ALGORITHM |
3120e25e | 232 | def_bool y |
1032c0ba | 233 | |
1032c0ba SR |
234 | config GENERIC_CALIBRATE_DELAY |
235 | def_bool y | |
236 | ||
9a0b8415 | 237 | config ARCH_HAS_CPU_RELAX |
238 | def_bool y | |
239 | ||
1b27d05b PE |
240 | config ARCH_HAS_CACHE_LINE_SIZE |
241 | def_bool y | |
242 | ||
dd5af90a | 243 | config HAVE_SETUP_PER_CPU_AREA |
89c9c4c5 | 244 | def_bool y |
b32ef636 | 245 | |
08fc4580 TH |
246 | config NEED_PER_CPU_EMBED_FIRST_CHUNK |
247 | def_bool y | |
248 | ||
249 | config NEED_PER_CPU_PAGE_FIRST_CHUNK | |
11124411 TH |
250 | def_bool y |
251 | ||
801e4062 JB |
252 | config ARCH_HIBERNATION_POSSIBLE |
253 | def_bool y | |
801e4062 | 254 | |
f4cb5700 JB |
255 | config ARCH_SUSPEND_POSSIBLE |
256 | def_bool y | |
f4cb5700 | 257 | |
cfe28c5d SC |
258 | config ARCH_WANT_HUGE_PMD_SHARE |
259 | def_bool y | |
260 | ||
53313b2c SC |
261 | config ARCH_WANT_GENERAL_HUGETLB |
262 | def_bool y | |
263 | ||
8d5fffb9 | 264 | config ZONE_DMA32 |
e0fd24a3 | 265 | def_bool y if X86_64 |
8d5fffb9 | 266 | |
8d5fffb9 | 267 | config AUDIT_ARCH |
e0fd24a3 | 268 | def_bool y if X86_64 |
8d5fffb9 | 269 | |
765c68bd IM |
270 | config ARCH_SUPPORTS_OPTIMIZED_INLINING |
271 | def_bool y | |
272 | ||
6a11f75b AM |
273 | config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
274 | def_bool y | |
275 | ||
d6f2d75a AR |
276 | config KASAN_SHADOW_OFFSET |
277 | hex | |
278 | depends on KASAN | |
279 | default 0xdffffc0000000000 | |
280 | ||
69575d38 SW |
281 | config HAVE_INTEL_TXT |
282 | def_bool y | |
6ea30386 | 283 | depends on INTEL_IOMMU && ACPI |
69575d38 | 284 | |
6b0c3d44 SR |
285 | config X86_32_SMP |
286 | def_bool y | |
287 | depends on X86_32 && SMP | |
288 | ||
289 | config X86_64_SMP | |
290 | def_bool y | |
291 | depends on X86_64 && SMP | |
292 | ||
ccbeed3a TH |
293 | config X86_32_LAZY_GS |
294 | def_bool y | |
60a5317f | 295 | depends on X86_32 && !CC_STACKPROTECTOR |
ccbeed3a | 296 | |
d61931d8 BP |
297 | config ARCH_HWEIGHT_CFLAGS |
298 | string | |
299 | default "-fcall-saved-ecx -fcall-saved-edx" if X86_32 | |
300 | default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64 | |
301 | ||
2b144498 SD |
302 | config ARCH_SUPPORTS_UPROBES |
303 | def_bool y | |
304 | ||
d20642f0 RH |
305 | config FIX_EARLYCON_MEM |
306 | def_bool y | |
307 | ||
9ccaf77c KC |
308 | config DEBUG_RODATA |
309 | def_bool y | |
310 | ||
98233368 KS |
311 | config PGTABLE_LEVELS |
312 | int | |
313 | default 4 if X86_64 | |
314 | default 3 if X86_PAE | |
315 | default 2 | |
316 | ||
506f1d07 | 317 | source "init/Kconfig" |
dc52ddc0 | 318 | source "kernel/Kconfig.freezer" |
8d5fffb9 | 319 | |
506f1d07 SR |
320 | menu "Processor type and features" |
321 | ||
5ee71535 RD |
322 | config ZONE_DMA |
323 | bool "DMA memory allocation support" if EXPERT | |
324 | default y | |
325 | help | |
326 | DMA memory allocation support allows devices with less than 32-bit | |
327 | addressing to allocate within the first 16MB of address space. | |
328 | Disable if no such devices will be used. | |
329 | ||
330 | If unsure, say Y. | |
331 | ||
506f1d07 SR |
332 | config SMP |
333 | bool "Symmetric multi-processing support" | |
334 | ---help--- | |
335 | This enables support for systems with more than one CPU. If you have | |
4a474157 RG |
336 | a system with only one CPU, say N. If you have a system with more |
337 | than one CPU, say Y. | |
506f1d07 | 338 | |
4a474157 | 339 | If you say N here, the kernel will run on uni- and multiprocessor |
506f1d07 SR |
340 | machines, but will use only one CPU of a multiprocessor machine. If |
341 | you say Y here, the kernel will run on many, but not all, | |
4a474157 | 342 | uniprocessor machines. On a uniprocessor machine, the kernel |
506f1d07 SR |
343 | will run faster if you say N here. |
344 | ||
345 | Note that if you say Y here and choose architecture "586" or | |
346 | "Pentium" under "Processor family", the kernel will not work on 486 | |
347 | architectures. Similarly, multiprocessor kernels for the "PPro" | |
348 | architecture may not work on all Pentium based boards. | |
349 | ||
350 | People using multiprocessor machines who say Y here should also say | |
351 | Y to "Enhanced Real Time Clock Support", below. The "Advanced Power | |
352 | Management" code will be disabled if you say Y here. | |
353 | ||
395cf969 | 354 | See also <file:Documentation/x86/i386/IO-APIC.txt>, |
506f1d07 SR |
355 | <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at |
356 | <http://www.tldp.org/docs.html#howto>. | |
357 | ||
358 | If you don't know what to do here, say N. | |
359 | ||
9def39be JT |
360 | config X86_FEATURE_NAMES |
361 | bool "Processor feature human-readable names" if EMBEDDED | |
362 | default y | |
363 | ---help--- | |
364 | This option compiles in a table of x86 feature bits and corresponding | |
365 | names. This is required to support /proc/cpuinfo and a few kernel | |
366 | messages. You can disable this to save space, at the expense of | |
367 | making those few kernel messages show numeric feature bits instead. | |
368 | ||
369 | If in doubt, say Y. | |
370 | ||
6e1315fe BP |
371 | config X86_FAST_FEATURE_TESTS |
372 | bool "Fast CPU feature tests" if EMBEDDED | |
373 | default y | |
374 | ---help--- | |
375 | Some fast-paths in the kernel depend on the capabilities of the CPU. | |
376 | Say Y here for the kernel to patch in the appropriate code at runtime | |
377 | based on the capabilities of the CPU. The infrastructure for patching | |
378 | code at runtime takes up some additional space; space-constrained | |
379 | embedded systems may wish to say N here to produce smaller, slightly | |
380 | slower code. | |
381 | ||
06cd9a7d YL |
382 | config X86_X2APIC |
383 | bool "Support x2apic" | |
19e3d60d | 384 | depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST) |
06cd9a7d YL |
385 | ---help--- |
386 | This enables x2apic support on CPUs that have this feature. | |
387 | ||
388 | This allows 32-bit apic IDs (so it can support very large systems), | |
389 | and accesses the local apic via MSRs not via mmio. | |
390 | ||
06cd9a7d YL |
391 | If you don't know what to do here, say N. |
392 | ||
6695c85b | 393 | config X86_MPPARSE |
6e87f9b7 | 394 | bool "Enable MPS table" if ACPI || SFI |
7a527688 | 395 | default y |
5ab74722 | 396 | depends on X86_LOCAL_APIC |
8f9ca475 | 397 | ---help--- |
6695c85b YL |
398 | For old smp systems that do not have proper acpi support. Newer systems |
399 | (esp with 64bit cpus) with acpi support, MADT and DSDT will override it | |
6695c85b | 400 | |
26f7ef14 YL |
401 | config X86_BIGSMP |
402 | bool "Support for big SMP systems with more than 8 CPUs" | |
403 | depends on X86_32 && SMP | |
8f9ca475 | 404 | ---help--- |
26f7ef14 | 405 | This option is needed for the systems that have more than 8 CPUs |
506f1d07 | 406 | |
ddd70cf9 JN |
407 | config GOLDFISH |
408 | def_bool y | |
409 | depends on X86_GOLDFISH | |
410 | ||
8425091f | 411 | if X86_32 |
c5c606d9 RT |
412 | config X86_EXTENDED_PLATFORM |
413 | bool "Support for extended (non-PC) x86 platforms" | |
414 | default y | |
8f9ca475 | 415 | ---help--- |
06ac8346 IM |
416 | If you disable this option then the kernel will only support |
417 | standard PC platforms. (which covers the vast majority of | |
418 | systems out there.) | |
419 | ||
8425091f RT |
420 | If you enable this option then you'll be able to select support |
421 | for the following (non-PC) 32 bit x86 platforms: | |
cb7b8023 | 422 | Goldfish (Android emulator) |
8425091f | 423 | AMD Elan |
8425091f RT |
424 | RDC R-321x SoC |
425 | SGI 320/540 (Visual Workstation) | |
83125a3a | 426 | STA2X11-based (e.g. Northville) |
3f4110a4 | 427 | Moorestown MID devices |
06ac8346 IM |
428 | |
429 | If you have one of these systems, or if you want to build a | |
430 | generic distribution kernel, say Y here - otherwise say N. | |
8425091f | 431 | endif |
06ac8346 | 432 | |
8425091f RT |
433 | if X86_64 |
434 | config X86_EXTENDED_PLATFORM | |
435 | bool "Support for extended (non-PC) x86 platforms" | |
436 | default y | |
437 | ---help--- | |
438 | If you disable this option then the kernel will only support | |
439 | standard PC platforms. (which covers the vast majority of | |
440 | systems out there.) | |
441 | ||
442 | If you enable this option then you'll be able to select support | |
443 | for the following (non-PC) 64 bit x86 platforms: | |
44b111b5 | 444 | Numascale NumaChip |
8425091f RT |
445 | ScaleMP vSMP |
446 | SGI Ultraviolet | |
447 | ||
448 | If you have one of these systems, or if you want to build a | |
449 | generic distribution kernel, say Y here - otherwise say N. | |
450 | endif | |
c5c606d9 RT |
451 | # This is an alphabetically sorted list of 64 bit extended platforms |
452 | # Please maintain the alphabetic order if and when there are additions | |
44b111b5 SP |
453 | config X86_NUMACHIP |
454 | bool "Numascale NumaChip" | |
455 | depends on X86_64 | |
456 | depends on X86_EXTENDED_PLATFORM | |
457 | depends on NUMA | |
458 | depends on SMP | |
459 | depends on X86_X2APIC | |
f9726bfd | 460 | depends on PCI_MMCONFIG |
44b111b5 SP |
461 | ---help--- |
462 | Adds support for Numascale NumaChip large-SMP systems. Needed to | |
463 | enable more than ~168 cores. | |
464 | If you don't have one of these, you should say N here. | |
506f1d07 | 465 | |
c5c606d9 RT |
466 | config X86_VSMP |
467 | bool "ScaleMP vSMP" | |
6276a074 | 468 | select HYPERVISOR_GUEST |
c5c606d9 RT |
469 | select PARAVIRT |
470 | depends on X86_64 && PCI | |
471 | depends on X86_EXTENDED_PLATFORM | |
ead91d4b | 472 | depends on SMP |
8f9ca475 | 473 | ---help--- |
c5c606d9 RT |
474 | Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is |
475 | supposed to run on these EM64T-based machines. Only choose this option | |
476 | if you have one of these machines. | |
5e3a77e9 | 477 | |
03b48632 NP |
478 | config X86_UV |
479 | bool "SGI Ultraviolet" | |
480 | depends on X86_64 | |
c5c606d9 | 481 | depends on X86_EXTENDED_PLATFORM |
54c28d29 | 482 | depends on NUMA |
1ecb4ae5 | 483 | depends on EFI |
9d6c26e7 | 484 | depends on X86_X2APIC |
1222e564 | 485 | depends on PCI |
8f9ca475 | 486 | ---help--- |
03b48632 NP |
487 | This option is needed in order to support SGI Ultraviolet systems. |
488 | If you don't have one of these, you should say N here. | |
489 | ||
c5c606d9 RT |
490 | # Following is an alphabetically sorted list of 32 bit extended platforms |
491 | # Please maintain the alphabetic order if and when there are additions | |
506f1d07 | 492 | |
ddd70cf9 JN |
493 | config X86_GOLDFISH |
494 | bool "Goldfish (Virtual Platform)" | |
cb7b8023 | 495 | depends on X86_EXTENDED_PLATFORM |
ddd70cf9 JN |
496 | ---help--- |
497 | Enable support for the Goldfish virtual platform used primarily | |
498 | for Android development. Unless you are building for the Android | |
499 | Goldfish emulator say N here. | |
500 | ||
c751e17b TG |
501 | config X86_INTEL_CE |
502 | bool "CE4100 TV platform" | |
503 | depends on PCI | |
504 | depends on PCI_GODIRECT | |
6084a6e2 | 505 | depends on X86_IO_APIC |
c751e17b TG |
506 | depends on X86_32 |
507 | depends on X86_EXTENDED_PLATFORM | |
37bc9f50 | 508 | select X86_REBOOTFIXUPS |
da6b737b SAS |
509 | select OF |
510 | select OF_EARLY_FLATTREE | |
c751e17b TG |
511 | ---help--- |
512 | Select for the Intel CE media processor (CE4100) SOC. | |
513 | This option compiles in support for the CE4100 SOC for settop | |
514 | boxes and media devices. | |
515 | ||
4cb9b00f | 516 | config X86_INTEL_MID |
43605ef1 | 517 | bool "Intel MID platform support" |
43605ef1 | 518 | depends on X86_EXTENDED_PLATFORM |
edc6bc78 | 519 | depends on X86_PLATFORM_DEVICES |
1ea7c673 | 520 | depends on PCI |
3fda5bb4 | 521 | depends on X86_64 || (PCI_GOANY && X86_32) |
1ea7c673 | 522 | depends on X86_IO_APIC |
7c9c3a1e | 523 | select SFI |
4cb9b00f | 524 | select I2C |
7c9c3a1e | 525 | select DW_APB_TIMER |
1ea7c673 | 526 | select APB_TIMER |
1ea7c673 | 527 | select INTEL_SCU_IPC |
15a713df | 528 | select MFD_INTEL_MSIC |
1ea7c673 | 529 | ---help--- |
4cb9b00f DC |
530 | Select to build a kernel capable of supporting Intel MID (Mobile |
531 | Internet Device) platform systems which do not have the PCI legacy | |
532 | interfaces. If you are building for a PC class system say N here. | |
1ea7c673 | 533 | |
4cb9b00f DC |
534 | Intel MID platforms are based on an Intel processor and chipset which |
535 | consume less power than most of the x86 derivatives. | |
43605ef1 | 536 | |
8bbc2a13 BD |
537 | config X86_INTEL_QUARK |
538 | bool "Intel Quark platform support" | |
539 | depends on X86_32 | |
540 | depends on X86_EXTENDED_PLATFORM | |
541 | depends on X86_PLATFORM_DEVICES | |
542 | depends on X86_TSC | |
543 | depends on PCI | |
544 | depends on PCI_GOANY | |
545 | depends on X86_IO_APIC | |
546 | select IOSF_MBI | |
547 | select INTEL_IMR | |
9ab6eb51 | 548 | select COMMON_CLK |
8bbc2a13 BD |
549 | ---help--- |
550 | Select to include support for Quark X1000 SoC. | |
551 | Say Y here if you have a Quark based system such as the Arduino | |
552 | compatible Intel Galileo. | |
553 | ||
3d48aab1 MW |
554 | config X86_INTEL_LPSS |
555 | bool "Intel Low Power Subsystem Support" | |
eebb3e8d | 556 | depends on X86 && ACPI |
3d48aab1 | 557 | select COMMON_CLK |
0f531431 | 558 | select PINCTRL |
eebb3e8d | 559 | select IOSF_MBI |
3d48aab1 MW |
560 | ---help--- |
561 | Select to build support for Intel Low Power Subsystem such as | |
562 | found on Intel Lynxpoint PCH. Selecting this option enables | |
0f531431 MN |
563 | things like clock tree (common clock framework) and pincontrol |
564 | which are needed by the LPSS peripheral drivers. | |
3d48aab1 | 565 | |
92082a88 KX |
566 | config X86_AMD_PLATFORM_DEVICE |
567 | bool "AMD ACPI2Platform devices support" | |
568 | depends on ACPI | |
569 | select COMMON_CLK | |
570 | select PINCTRL | |
571 | ---help--- | |
572 | Select to interpret AMD specific ACPI device to platform device | |
573 | such as I2C, UART, GPIO found on AMD Carrizo and later chipsets. | |
574 | I2C and UART depend on COMMON_CLK to set clock. GPIO driver is | |
575 | implemented under PINCTRL subsystem. | |
576 | ||
ced3ce76 DB |
577 | config IOSF_MBI |
578 | tristate "Intel SoC IOSF Sideband support for SoC platforms" | |
579 | depends on PCI | |
580 | ---help--- | |
581 | This option enables sideband register access support for Intel SoC | |
582 | platforms. On these platforms the IOSF sideband is used in lieu of | |
583 | MSR's for some register accesses, mostly but not limited to thermal | |
584 | and power. Drivers may query the availability of this device to | |
585 | determine if they need the sideband in order to work on these | |
586 | platforms. The sideband is available on the following SoC products. | |
587 | This list is not meant to be exclusive. | |
588 | - BayTrail | |
589 | - Braswell | |
590 | - Quark | |
591 | ||
592 | You should say Y if you are running a kernel on one of these SoC's. | |
593 | ||
ed2226bd DB |
594 | config IOSF_MBI_DEBUG |
595 | bool "Enable IOSF sideband access through debugfs" | |
596 | depends on IOSF_MBI && DEBUG_FS | |
597 | ---help--- | |
598 | Select this option to expose the IOSF sideband access registers (MCR, | |
599 | MDR, MCRX) through debugfs to write and read register information from | |
600 | different units on the SoC. This is most useful for obtaining device | |
601 | state information for debug and analysis. As this is a general access | |
602 | mechanism, users of this option would have specific knowledge of the | |
603 | device they want to access. | |
604 | ||
605 | If you don't require the option or are in doubt, say N. | |
606 | ||
c5c606d9 RT |
607 | config X86_RDC321X |
608 | bool "RDC R-321x SoC" | |
506f1d07 | 609 | depends on X86_32 |
c5c606d9 RT |
610 | depends on X86_EXTENDED_PLATFORM |
611 | select M486 | |
612 | select X86_REBOOTFIXUPS | |
613 | ---help--- | |
614 | This option is needed for RDC R-321x system-on-chip, also known | |
615 | as R-8610-(G). | |
616 | If you don't have one of these chips, you should say N here. | |
617 | ||
e0c7ae37 | 618 | config X86_32_NON_STANDARD |
9c398017 IM |
619 | bool "Support non-standard 32-bit SMP architectures" |
620 | depends on X86_32 && SMP | |
c5c606d9 | 621 | depends on X86_EXTENDED_PLATFORM |
8f9ca475 | 622 | ---help--- |
b5660ba7 PA |
623 | This option compiles in the bigsmp and STA2X11 default |
624 | subarchitectures. It is intended for a generic binary | |
625 | kernel. If you select them all, kernel will probe it one by | |
626 | one and will fallback to default. | |
d49c4288 | 627 | |
c5c606d9 | 628 | # Alphabetically sorted list of Non standard 32 bit platforms |
d49c4288 | 629 | |
d949f36f | 630 | config X86_SUPPORTS_MEMORY_FAILURE |
6fc108a0 | 631 | def_bool y |
d949f36f LT |
632 | # MCE code calls memory_failure(): |
633 | depends on X86_MCE | |
634 | # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags: | |
d949f36f LT |
635 | # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH: |
636 | depends on X86_64 || !SPARSEMEM | |
637 | select ARCH_SUPPORTS_MEMORY_FAILURE | |
d949f36f | 638 | |
83125a3a AR |
639 | config STA2X11 |
640 | bool "STA2X11 Companion Chip Support" | |
641 | depends on X86_32_NON_STANDARD && PCI | |
642 | select X86_DEV_DMA_OPS | |
643 | select X86_DMA_REMAP | |
644 | select SWIOTLB | |
645 | select MFD_STA2X11 | |
646 | select ARCH_REQUIRE_GPIOLIB | |
647 | default n | |
648 | ---help--- | |
649 | This adds support for boards based on the STA2X11 IO-Hub, | |
650 | a.k.a. "ConneXt". The chip is used in place of the standard | |
651 | PC chipset, so all "standard" peripherals are missing. If this | |
652 | option is selected the kernel will still be able to boot on | |
653 | standard PC machines. | |
654 | ||
82148d1d S |
655 | config X86_32_IRIS |
656 | tristate "Eurobraille/Iris poweroff module" | |
657 | depends on X86_32 | |
658 | ---help--- | |
659 | The Iris machines from EuroBraille do not have APM or ACPI support | |
660 | to shut themselves down properly. A special I/O sequence is | |
661 | needed to do so, which is what this module does at | |
662 | kernel shutdown. | |
663 | ||
664 | This is only for Iris machines from EuroBraille. | |
665 | ||
666 | If unused, say N. | |
667 | ||
ae1e9130 | 668 | config SCHED_OMIT_FRAME_POINTER |
3c2362e6 HH |
669 | def_bool y |
670 | prompt "Single-depth WCHAN output" | |
a87d0914 | 671 | depends on X86 |
8f9ca475 | 672 | ---help--- |
506f1d07 SR |
673 | Calculate simpler /proc/<PID>/wchan values. If this option |
674 | is disabled then wchan values will recurse back to the | |
675 | caller function. This provides more accurate wchan values, | |
676 | at the expense of slightly more scheduling overhead. | |
677 | ||
678 | If in doubt, say "Y". | |
679 | ||
6276a074 BP |
680 | menuconfig HYPERVISOR_GUEST |
681 | bool "Linux guest support" | |
8f9ca475 | 682 | ---help--- |
6276a074 BP |
683 | Say Y here to enable options for running Linux under various hyper- |
684 | visors. This option enables basic hypervisor detection and platform | |
685 | setup. | |
506f1d07 | 686 | |
6276a074 BP |
687 | If you say N, all options in this submenu will be skipped and |
688 | disabled, and Linux guest support won't be built in. | |
506f1d07 | 689 | |
6276a074 | 690 | if HYPERVISOR_GUEST |
506f1d07 | 691 | |
e61bd94a EPH |
692 | config PARAVIRT |
693 | bool "Enable paravirtualization code" | |
8f9ca475 | 694 | ---help--- |
e61bd94a EPH |
695 | This changes the kernel so it can modify itself when it is run |
696 | under a hypervisor, potentially improving performance significantly | |
697 | over full virtualization. However, when run without a hypervisor | |
698 | the kernel is theoretically slower and slightly larger. | |
699 | ||
6276a074 BP |
700 | config PARAVIRT_DEBUG |
701 | bool "paravirt-ops debugging" | |
702 | depends on PARAVIRT && DEBUG_KERNEL | |
703 | ---help--- | |
704 | Enable to debug paravirt_ops internals. Specifically, BUG if | |
705 | a paravirt_op is missing when it is called. | |
706 | ||
b4ecc126 JF |
707 | config PARAVIRT_SPINLOCKS |
708 | bool "Paravirtualization layer for spinlocks" | |
6ea30386 | 709 | depends on PARAVIRT && SMP |
62c7a1e9 | 710 | select UNINLINE_SPIN_UNLOCK if !QUEUED_SPINLOCKS |
b4ecc126 JF |
711 | ---help--- |
712 | Paravirtualized spinlocks allow a pvops backend to replace the | |
713 | spinlock implementation with something virtualization-friendly | |
714 | (for example, block the virtual CPU rather than spinning). | |
715 | ||
4c4e4f61 R |
716 | It has a minimal impact on native kernels and gives a nice performance |
717 | benefit on paravirtualized KVM / Xen kernels. | |
b4ecc126 | 718 | |
4c4e4f61 | 719 | If you are unsure how to answer this question, answer Y. |
b4ecc126 | 720 | |
45e898b7 WL |
721 | config QUEUED_LOCK_STAT |
722 | bool "Paravirt queued spinlock statistics" | |
723 | depends on PARAVIRT_SPINLOCKS && DEBUG_FS && QUEUED_SPINLOCKS | |
724 | ---help--- | |
725 | Enable the collection of statistical data on the slowpath | |
726 | behavior of paravirtualized queued spinlocks and report | |
727 | them on debugfs. | |
728 | ||
6276a074 | 729 | source "arch/x86/xen/Kconfig" |
7af192c9 | 730 | |
6276a074 BP |
731 | config KVM_GUEST |
732 | bool "KVM Guest support (including kvmclock)" | |
733 | depends on PARAVIRT | |
734 | select PARAVIRT_CLOCK | |
735 | default y | |
8f9ca475 | 736 | ---help--- |
6276a074 BP |
737 | This option enables various optimizations for running under the KVM |
738 | hypervisor. It includes a paravirtualized clock, so that instead | |
739 | of relying on a PIT (or probably other) emulation by the | |
740 | underlying device model, the host provides the guest with | |
741 | timing infrastructure such as time of day, and system time | |
506f1d07 | 742 | |
1e20eb85 SV |
743 | config KVM_DEBUG_FS |
744 | bool "Enable debug information for KVM Guests in debugfs" | |
745 | depends on KVM_GUEST && DEBUG_FS | |
746 | default n | |
747 | ---help--- | |
748 | This option enables collection of various statistics for KVM guest. | |
749 | Statistics are displayed in debugfs filesystem. Enabling this option | |
750 | may incur significant overhead. | |
751 | ||
6276a074 BP |
752 | source "arch/x86/lguest/Kconfig" |
753 | ||
754 | config PARAVIRT_TIME_ACCOUNTING | |
755 | bool "Paravirtual steal time accounting" | |
756 | depends on PARAVIRT | |
757 | default n | |
8f9ca475 | 758 | ---help--- |
6276a074 BP |
759 | Select this option to enable fine granularity task steal time |
760 | accounting. Time spent executing other tasks in parallel with | |
761 | the current vCPU is discounted from the vCPU power. To account for | |
762 | that, there can be a small performance impact. | |
763 | ||
764 | If in doubt, say N here. | |
765 | ||
766 | config PARAVIRT_CLOCK | |
767 | bool | |
97349135 | 768 | |
6276a074 | 769 | endif #HYPERVISOR_GUEST |
97349135 | 770 | |
08677214 | 771 | config NO_BOOTMEM |
774ea0bc | 772 | def_bool y |
08677214 | 773 | |
506f1d07 SR |
774 | source "arch/x86/Kconfig.cpu" |
775 | ||
776 | config HPET_TIMER | |
3c2362e6 | 777 | def_bool X86_64 |
506f1d07 | 778 | prompt "HPET Timer Support" if X86_32 |
8f9ca475 IM |
779 | ---help--- |
780 | Use the IA-PC HPET (High Precision Event Timer) to manage | |
781 | time in preference to the PIT and RTC, if a HPET is | |
782 | present. | |
783 | HPET is the next generation timer replacing legacy 8254s. | |
784 | The HPET provides a stable time base on SMP | |
785 | systems, unlike the TSC, but it is more expensive to access, | |
4e7f9df2 MT |
786 | as it is off-chip. The interface used is documented |
787 | in the HPET spec, revision 1. | |
506f1d07 | 788 | |
8f9ca475 IM |
789 | You can safely choose Y here. However, HPET will only be |
790 | activated if the platform and the BIOS support this feature. | |
791 | Otherwise the 8254 will be used for timing services. | |
506f1d07 | 792 | |
8f9ca475 | 793 | Choose N to continue using the legacy 8254 timer. |
506f1d07 SR |
794 | |
795 | config HPET_EMULATE_RTC | |
3c2362e6 | 796 | def_bool y |
9d8af78b | 797 | depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) |
506f1d07 | 798 | |
bb24c471 | 799 | config APB_TIMER |
933b9463 AC |
800 | def_bool y if X86_INTEL_MID |
801 | prompt "Intel MID APB Timer Support" if X86_INTEL_MID | |
06c3df49 | 802 | select DW_APB_TIMER |
a0c3832a | 803 | depends on X86_INTEL_MID && SFI |
bb24c471 JP |
804 | help |
805 | APB timer is the replacement for 8254, HPET on X86 MID platforms. | |
806 | The APBT provides a stable time base on SMP | |
807 | systems, unlike the TSC, but it is more expensive to access, | |
808 | as it is off-chip. APB timers are always running regardless of CPU | |
809 | C states, they are used as per CPU clockevent device when possible. | |
810 | ||
6a108a14 | 811 | # Mark as expert because too many people got it wrong. |
506f1d07 | 812 | # The code disables itself when not needed. |
7ae9392c TP |
813 | config DMI |
814 | default y | |
cf074402 | 815 | select DMI_SCAN_MACHINE_NON_EFI_FALLBACK |
6a108a14 | 816 | bool "Enable DMI scanning" if EXPERT |
8f9ca475 | 817 | ---help--- |
7ae9392c TP |
818 | Enabled scanning of DMI to identify machine quirks. Say Y |
819 | here unless you have verified that your setup is not | |
820 | affected by entries in the DMI blacklist. Required by PNP | |
821 | BIOS code. | |
822 | ||
506f1d07 | 823 | config GART_IOMMU |
38901f1c | 824 | bool "Old AMD GART IOMMU support" |
506f1d07 | 825 | select SWIOTLB |
23ac4ae8 | 826 | depends on X86_64 && PCI && AMD_NB |
8f9ca475 | 827 | ---help--- |
ced3c42c IM |
828 | Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron |
829 | GART based hardware IOMMUs. | |
830 | ||
831 | The GART supports full DMA access for devices with 32-bit access | |
832 | limitations, on systems with more than 3 GB. This is usually needed | |
833 | for USB, sound, many IDE/SATA chipsets and some other devices. | |
834 | ||
835 | Newer systems typically have a modern AMD IOMMU, supported via | |
836 | the CONFIG_AMD_IOMMU=y config option. | |
837 | ||
838 | In normal configurations this driver is only active when needed: | |
839 | there's more than 3 GB of memory and the system contains a | |
840 | 32-bit limited device. | |
841 | ||
842 | If unsure, say Y. | |
506f1d07 SR |
843 | |
844 | config CALGARY_IOMMU | |
845 | bool "IBM Calgary IOMMU support" | |
846 | select SWIOTLB | |
6ea30386 | 847 | depends on X86_64 && PCI |
8f9ca475 | 848 | ---help--- |
506f1d07 SR |
849 | Support for hardware IOMMUs in IBM's xSeries x366 and x460 |
850 | systems. Needed to run systems with more than 3GB of memory | |
851 | properly with 32-bit PCI devices that do not support DAC | |
852 | (Double Address Cycle). Calgary also supports bus level | |
853 | isolation, where all DMAs pass through the IOMMU. This | |
854 | prevents them from going anywhere except their intended | |
855 | destination. This catches hard-to-find kernel bugs and | |
856 | mis-behaving drivers and devices that do not use the DMA-API | |
857 | properly to set up their DMA buffers. The IOMMU can be | |
858 | turned off at boot time with the iommu=off parameter. | |
859 | Normally the kernel will make the right choice by itself. | |
860 | If unsure, say Y. | |
861 | ||
862 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT | |
3c2362e6 HH |
863 | def_bool y |
864 | prompt "Should Calgary be enabled by default?" | |
506f1d07 | 865 | depends on CALGARY_IOMMU |
8f9ca475 | 866 | ---help--- |
506f1d07 SR |
867 | Should Calgary be enabled by default? if you choose 'y', Calgary |
868 | will be used (if it exists). If you choose 'n', Calgary will not be | |
869 | used even if it exists. If you choose 'n' and would like to use | |
870 | Calgary anyway, pass 'iommu=calgary' on the kernel command line. | |
871 | If unsure, say Y. | |
872 | ||
873 | # need this always selected by IOMMU for the VIA workaround | |
874 | config SWIOTLB | |
a1afd01c | 875 | def_bool y if X86_64 |
8f9ca475 | 876 | ---help--- |
506f1d07 | 877 | Support for software bounce buffers used on x86-64 systems |
4454d327 JM |
878 | which don't have a hardware IOMMU. Using this PCI devices |
879 | which can only access 32-bits of memory can be used on systems | |
880 | with more than 3 GB of memory. | |
881 | If unsure, say Y. | |
506f1d07 | 882 | |
a8522509 | 883 | config IOMMU_HELPER |
3120e25e JB |
884 | def_bool y |
885 | depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU | |
d25e26b6 | 886 | |
1184dc2f | 887 | config MAXSMP |
ddb0c5a6 | 888 | bool "Enable Maximum number of SMP Processors and NUMA Nodes" |
6ea30386 | 889 | depends on X86_64 && SMP && DEBUG_KERNEL |
36f5101a | 890 | select CPUMASK_OFFSTACK |
8f9ca475 | 891 | ---help--- |
ddb0c5a6 | 892 | Enable maximum number of CPUS and NUMA Nodes for this architecture. |
1184dc2f | 893 | If unsure, say N. |
506f1d07 SR |
894 | |
895 | config NR_CPUS | |
36f5101a | 896 | int "Maximum number of CPUs" if SMP && !MAXSMP |
2a3313f4 | 897 | range 2 8 if SMP && X86_32 && !X86_BIGSMP |
bb61ccc7 | 898 | range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK |
b53b5eda | 899 | range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64 |
78637a97 | 900 | default "1" if !SMP |
b53b5eda | 901 | default "8192" if MAXSMP |
b5660ba7 | 902 | default "32" if SMP && X86_BIGSMP |
c5c19941 KS |
903 | default "8" if SMP && X86_32 |
904 | default "64" if SMP | |
8f9ca475 | 905 | ---help--- |
506f1d07 | 906 | This allows you to specify the maximum number of CPUs which this |
bb61ccc7 | 907 | kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum |
cad14bb9 | 908 | supported value is 8192, otherwise the maximum value is 512. The |
506f1d07 SR |
909 | minimum value which makes sense is 2. |
910 | ||
911 | This is purely to save memory - each supported CPU adds | |
912 | approximately eight kilobytes to the kernel image. | |
913 | ||
914 | config SCHED_SMT | |
915 | bool "SMT (Hyperthreading) scheduler support" | |
c8e56d20 | 916 | depends on SMP |
8f9ca475 | 917 | ---help--- |
506f1d07 SR |
918 | SMT scheduler support improves the CPU scheduler's decision making |
919 | when dealing with Intel Pentium 4 chips with HyperThreading at a | |
920 | cost of slightly increased overhead in some places. If unsure say | |
921 | N here. | |
922 | ||
923 | config SCHED_MC | |
3c2362e6 HH |
924 | def_bool y |
925 | prompt "Multi-core scheduler support" | |
c8e56d20 | 926 | depends on SMP |
8f9ca475 | 927 | ---help--- |
506f1d07 SR |
928 | Multi-core scheduler support improves the CPU scheduler's decision |
929 | making when dealing with multi-core CPU chips at a cost of slightly | |
930 | increased overhead in some places. If unsure say N here. | |
931 | ||
932 | source "kernel/Kconfig.preempt" | |
933 | ||
30b8b006 TG |
934 | config UP_LATE_INIT |
935 | def_bool y | |
ba360f88 | 936 | depends on !SMP && X86_LOCAL_APIC |
30b8b006 | 937 | |
506f1d07 | 938 | config X86_UP_APIC |
50849eef JB |
939 | bool "Local APIC support on uniprocessors" if !PCI_MSI |
940 | default PCI_MSI | |
38a1dfda | 941 | depends on X86_32 && !SMP && !X86_32_NON_STANDARD |
8f9ca475 | 942 | ---help--- |
506f1d07 SR |
943 | A local APIC (Advanced Programmable Interrupt Controller) is an |
944 | integrated interrupt controller in the CPU. If you have a single-CPU | |
945 | system which has a processor with a local APIC, you can say Y here to | |
946 | enable and use it. If you say Y here even though your machine doesn't | |
947 | have a local APIC, then the kernel will still run with no slowdown at | |
948 | all. The local APIC supports CPU-generated self-interrupts (timer, | |
949 | performance counters), and the NMI watchdog which detects hard | |
950 | lockups. | |
951 | ||
952 | config X86_UP_IOAPIC | |
953 | bool "IO-APIC support on uniprocessors" | |
954 | depends on X86_UP_APIC | |
8f9ca475 | 955 | ---help--- |
506f1d07 SR |
956 | An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an |
957 | SMP-capable replacement for PC-style interrupt controllers. Most | |
958 | SMP systems and many recent uniprocessor systems have one. | |
959 | ||
960 | If you have a single-CPU system with an IO-APIC, you can say Y here | |
961 | to use it. If you say Y here even though your machine doesn't have | |
962 | an IO-APIC, then the kernel will still run with no slowdown at all. | |
963 | ||
964 | config X86_LOCAL_APIC | |
3c2362e6 | 965 | def_bool y |
0dbc6078 | 966 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI |
b5dc8e6c | 967 | select IRQ_DOMAIN_HIERARCHY |
52f518a3 | 968 | select PCI_MSI_IRQ_DOMAIN if PCI_MSI |
506f1d07 SR |
969 | |
970 | config X86_IO_APIC | |
b1da1e71 JB |
971 | def_bool y |
972 | depends on X86_LOCAL_APIC || X86_UP_IOAPIC | |
506f1d07 | 973 | |
41b9eb26 SA |
974 | config X86_REROUTE_FOR_BROKEN_BOOT_IRQS |
975 | bool "Reroute for broken boot IRQs" | |
41b9eb26 | 976 | depends on X86_IO_APIC |
8f9ca475 | 977 | ---help--- |
41b9eb26 SA |
978 | This option enables a workaround that fixes a source of |
979 | spurious interrupts. This is recommended when threaded | |
980 | interrupt handling is used on systems where the generation of | |
981 | superfluous "boot interrupts" cannot be disabled. | |
982 | ||
983 | Some chipsets generate a legacy INTx "boot IRQ" when the IRQ | |
984 | entry in the chipset's IO-APIC is masked (as, e.g. the RT | |
985 | kernel does during interrupt handling). On chipsets where this | |
986 | boot IRQ generation cannot be disabled, this workaround keeps | |
987 | the original IRQ line masked so that only the equivalent "boot | |
988 | IRQ" is delivered to the CPUs. The workaround also tells the | |
989 | kernel to set up the IRQ handler on the boot IRQ line. In this | |
990 | way only one interrupt is delivered to the kernel. Otherwise | |
991 | the spurious second interrupt may cause the kernel to bring | |
992 | down (vital) interrupt lines. | |
993 | ||
994 | Only affects "broken" chipsets. Interrupt sharing may be | |
995 | increased on these systems. | |
996 | ||
506f1d07 | 997 | config X86_MCE |
bab9bc65 | 998 | bool "Machine Check / overheating reporting" |
648ed940 | 999 | select GENERIC_ALLOCATOR |
e57dbaf7 | 1000 | default y |
506f1d07 | 1001 | ---help--- |
bab9bc65 AK |
1002 | Machine Check support allows the processor to notify the |
1003 | kernel if it detects a problem (e.g. overheating, data corruption). | |
506f1d07 | 1004 | The action the kernel takes depends on the severity of the problem, |
bab9bc65 | 1005 | ranging from warning messages to halting the machine. |
4efc0670 | 1006 | |
506f1d07 | 1007 | config X86_MCE_INTEL |
3c2362e6 HH |
1008 | def_bool y |
1009 | prompt "Intel MCE features" | |
c1ebf835 | 1010 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 1011 | ---help--- |
506f1d07 SR |
1012 | Additional support for intel specific MCE features such as |
1013 | the thermal monitor. | |
1014 | ||
1015 | config X86_MCE_AMD | |
3c2362e6 HH |
1016 | def_bool y |
1017 | prompt "AMD MCE features" | |
c1ebf835 | 1018 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 1019 | ---help--- |
506f1d07 SR |
1020 | Additional support for AMD specific MCE features such as |
1021 | the DRAM Error Threshold. | |
1022 | ||
4efc0670 | 1023 | config X86_ANCIENT_MCE |
6fc108a0 | 1024 | bool "Support for old Pentium 5 / WinChip machine checks" |
c31d9633 | 1025 | depends on X86_32 && X86_MCE |
cd13adcc HS |
1026 | ---help--- |
1027 | Include support for machine check handling on old Pentium 5 or WinChip | |
5065a706 | 1028 | systems. These typically need to be enabled explicitly on the command |
cd13adcc | 1029 | line. |
4efc0670 | 1030 | |
b2762686 AK |
1031 | config X86_MCE_THRESHOLD |
1032 | depends on X86_MCE_AMD || X86_MCE_INTEL | |
6fc108a0 | 1033 | def_bool y |
b2762686 | 1034 | |
ea149b36 | 1035 | config X86_MCE_INJECT |
c1ebf835 | 1036 | depends on X86_MCE |
ea149b36 AK |
1037 | tristate "Machine check injector support" |
1038 | ---help--- | |
1039 | Provide support for injecting machine checks for testing purposes. | |
1040 | If you don't know what a machine check is and you don't do kernel | |
1041 | QA it is safe to say n. | |
1042 | ||
4efc0670 AK |
1043 | config X86_THERMAL_VECTOR |
1044 | def_bool y | |
5bb38adc | 1045 | depends on X86_MCE_INTEL |
4efc0670 | 1046 | |
07dc900e | 1047 | source "arch/x86/events/Kconfig" |
e633c65a | 1048 | |
5aef51c3 | 1049 | config X86_LEGACY_VM86 |
1e642812 | 1050 | bool "Legacy VM86 support" |
5aef51c3 | 1051 | default n |
506f1d07 | 1052 | depends on X86_32 |
8f9ca475 | 1053 | ---help--- |
5aef51c3 AL |
1054 | This option allows user programs to put the CPU into V8086 |
1055 | mode, which is an 80286-era approximation of 16-bit real mode. | |
1056 | ||
1057 | Some very old versions of X and/or vbetool require this option | |
1058 | for user mode setting. Similarly, DOSEMU will use it if | |
1059 | available to accelerate real mode DOS programs. However, any | |
1060 | recent version of DOSEMU, X, or vbetool should be fully | |
1061 | functional even without kernel VM86 support, as they will all | |
1e642812 IM |
1062 | fall back to software emulation. Nevertheless, if you are using |
1063 | a 16-bit DOS program where 16-bit performance matters, vm86 | |
1064 | mode might be faster than emulation and you might want to | |
1065 | enable this option. | |
5aef51c3 | 1066 | |
1e642812 IM |
1067 | Note that any app that works on a 64-bit kernel is unlikely to |
1068 | need this option, as 64-bit kernels don't, and can't, support | |
1069 | V8086 mode. This option is also unrelated to 16-bit protected | |
1070 | mode and is not needed to run most 16-bit programs under Wine. | |
5aef51c3 | 1071 | |
1e642812 IM |
1072 | Enabling this option increases the complexity of the kernel |
1073 | and slows down exception handling a tiny bit. | |
5aef51c3 | 1074 | |
1e642812 | 1075 | If unsure, say N here. |
5aef51c3 AL |
1076 | |
1077 | config VM86 | |
1078 | bool | |
1079 | default X86_LEGACY_VM86 | |
34273f41 PA |
1080 | |
1081 | config X86_16BIT | |
1082 | bool "Enable support for 16-bit segments" if EXPERT | |
1083 | default y | |
a5b9e5a2 | 1084 | depends on MODIFY_LDT_SYSCALL |
34273f41 PA |
1085 | ---help--- |
1086 | This option is required by programs like Wine to run 16-bit | |
1087 | protected mode legacy code on x86 processors. Disabling | |
1088 | this option saves about 300 bytes on i386, or around 6K text | |
1089 | plus 16K runtime memory on x86-64, | |
1090 | ||
1091 | config X86_ESPFIX32 | |
1092 | def_bool y | |
1093 | depends on X86_16BIT && X86_32 | |
506f1d07 | 1094 | |
197725de PA |
1095 | config X86_ESPFIX64 |
1096 | def_bool y | |
34273f41 | 1097 | depends on X86_16BIT && X86_64 |
506f1d07 | 1098 | |
1ad83c85 AL |
1099 | config X86_VSYSCALL_EMULATION |
1100 | bool "Enable vsyscall emulation" if EXPERT | |
1101 | default y | |
1102 | depends on X86_64 | |
1103 | ---help--- | |
1104 | This enables emulation of the legacy vsyscall page. Disabling | |
1105 | it is roughly equivalent to booting with vsyscall=none, except | |
1106 | that it will also disable the helpful warning if a program | |
1107 | tries to use a vsyscall. With this option set to N, offending | |
1108 | programs will just segfault, citing addresses of the form | |
1109 | 0xffffffffff600?00. | |
1110 | ||
1111 | This option is required by many programs built before 2013, and | |
1112 | care should be used even with newer programs if set to N. | |
1113 | ||
1114 | Disabling this option saves about 7K of kernel size and | |
1115 | possibly 4K of additional runtime pagetable memory. | |
1116 | ||
506f1d07 SR |
1117 | config TOSHIBA |
1118 | tristate "Toshiba Laptop support" | |
1119 | depends on X86_32 | |
1120 | ---help--- | |
1121 | This adds a driver to safely access the System Management Mode of | |
1122 | the CPU on Toshiba portables with a genuine Toshiba BIOS. It does | |
1123 | not work on models with a Phoenix BIOS. The System Management Mode | |
1124 | is used to set the BIOS and power saving options on Toshiba portables. | |
1125 | ||
1126 | For information on utilities to make use of this driver see the | |
1127 | Toshiba Linux utilities web site at: | |
1128 | <http://www.buzzard.org.uk/toshiba/>. | |
1129 | ||
1130 | Say Y if you intend to run this kernel on a Toshiba portable. | |
1131 | Say N otherwise. | |
1132 | ||
1133 | config I8K | |
039ae585 | 1134 | tristate "Dell i8k legacy laptop support" |
949a9d70 | 1135 | select HWMON |
039ae585 | 1136 | select SENSORS_DELL_SMM |
506f1d07 | 1137 | ---help--- |
039ae585 PR |
1138 | This option enables legacy /proc/i8k userspace interface in hwmon |
1139 | dell-smm-hwmon driver. Character file /proc/i8k reports bios version, | |
1140 | temperature and allows controlling fan speeds of Dell laptops via | |
1141 | System Management Mode. For old Dell laptops (like Dell Inspiron 8000) | |
1142 | it reports also power and hotkey status. For fan speed control is | |
1143 | needed userspace package i8kutils. | |
1144 | ||
1145 | Say Y if you intend to run this kernel on old Dell laptops or want to | |
1146 | use userspace package i8kutils. | |
506f1d07 SR |
1147 | Say N otherwise. |
1148 | ||
1149 | config X86_REBOOTFIXUPS | |
9ba16087 JB |
1150 | bool "Enable X86 board specific fixups for reboot" |
1151 | depends on X86_32 | |
506f1d07 SR |
1152 | ---help--- |
1153 | This enables chipset and/or board specific fixups to be done | |
1154 | in order to get reboot to work correctly. This is only needed on | |
1155 | some combinations of hardware and BIOS. The symptom, for which | |
1156 | this config is intended, is when reboot ends with a stalled/hung | |
1157 | system. | |
1158 | ||
1159 | Currently, the only fixup is for the Geode machines using | |
5e3a77e9 | 1160 | CS5530A and CS5536 chipsets and the RDC R-321x SoC. |
506f1d07 SR |
1161 | |
1162 | Say Y if you want to enable the fixup. Currently, it's safe to | |
1163 | enable this option even if you don't need it. | |
1164 | Say N otherwise. | |
1165 | ||
1166 | config MICROCODE | |
9a2bc335 BP |
1167 | bool "CPU microcode loading support" |
1168 | default y | |
80030e3d | 1169 | depends on CPU_SUP_AMD || CPU_SUP_INTEL |
506f1d07 SR |
1170 | select FW_LOADER |
1171 | ---help--- | |
1172 | If you say Y here, you will be able to update the microcode on | |
5f9c01aa BP |
1173 | Intel and AMD processors. The Intel support is for the IA32 family, |
1174 | e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, Xeon etc. The | |
1175 | AMD support is for families 0x10 and later. You will obviously need | |
1176 | the actual microcode binary data itself which is not shipped with | |
1177 | the Linux kernel. | |
1178 | ||
1179 | The preferred method to load microcode from a detached initrd is described | |
1180 | in Documentation/x86/early-microcode.txt. For that you need to enable | |
1181 | CONFIG_BLK_DEV_INITRD in order for the loader to be able to scan the | |
1182 | initrd for microcode blobs. | |
1183 | ||
1184 | In addition, you can build-in the microcode into the kernel. For that you | |
1185 | need to enable FIRMWARE_IN_KERNEL and add the vendor-supplied microcode | |
1186 | to the CONFIG_EXTRA_FIRMWARE config option. | |
506f1d07 | 1187 | |
8d86f390 | 1188 | config MICROCODE_INTEL |
e43f6e67 | 1189 | bool "Intel microcode loading support" |
8f9ca475 IM |
1190 | depends on MICROCODE |
1191 | default MICROCODE | |
1192 | select FW_LOADER | |
1193 | ---help--- | |
1194 | This options enables microcode patch loading support for Intel | |
1195 | processors. | |
1196 | ||
b8989db9 A |
1197 | For the current Intel microcode data package go to |
1198 | <https://downloadcenter.intel.com> and search for | |
1199 | 'Linux Processor Microcode Data File'. | |
8d86f390 | 1200 | |
80cc9f10 | 1201 | config MICROCODE_AMD |
e43f6e67 | 1202 | bool "AMD microcode loading support" |
8f9ca475 IM |
1203 | depends on MICROCODE |
1204 | select FW_LOADER | |
1205 | ---help--- | |
1206 | If you select this option, microcode patch loading support for AMD | |
1207 | processors will be enabled. | |
80cc9f10 | 1208 | |
8f9ca475 | 1209 | config MICROCODE_OLD_INTERFACE |
3c2362e6 | 1210 | def_bool y |
506f1d07 | 1211 | depends on MICROCODE |
506f1d07 SR |
1212 | |
1213 | config X86_MSR | |
1214 | tristate "/dev/cpu/*/msr - Model-specific register support" | |
8f9ca475 | 1215 | ---help--- |
506f1d07 SR |
1216 | This device gives privileged processes access to the x86 |
1217 | Model-Specific Registers (MSRs). It is a character device with | |
1218 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. | |
1219 | MSR accesses are directed to a specific CPU on multi-processor | |
1220 | systems. | |
1221 | ||
1222 | config X86_CPUID | |
1223 | tristate "/dev/cpu/*/cpuid - CPU information support" | |
8f9ca475 | 1224 | ---help--- |
506f1d07 SR |
1225 | This device gives processes access to the x86 CPUID instruction to |
1226 | be executed on a specific processor. It is a character device | |
1227 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to | |
1228 | /dev/cpu/31/cpuid. | |
1229 | ||
1230 | choice | |
1231 | prompt "High Memory Support" | |
6fc108a0 | 1232 | default HIGHMEM4G |
506f1d07 SR |
1233 | depends on X86_32 |
1234 | ||
1235 | config NOHIGHMEM | |
1236 | bool "off" | |
506f1d07 SR |
1237 | ---help--- |
1238 | Linux can use up to 64 Gigabytes of physical memory on x86 systems. | |
1239 | However, the address space of 32-bit x86 processors is only 4 | |
1240 | Gigabytes large. That means that, if you have a large amount of | |
1241 | physical memory, not all of it can be "permanently mapped" by the | |
1242 | kernel. The physical memory that's not permanently mapped is called | |
1243 | "high memory". | |
1244 | ||
1245 | If you are compiling a kernel which will never run on a machine with | |
1246 | more than 1 Gigabyte total physical RAM, answer "off" here (default | |
1247 | choice and suitable for most users). This will result in a "3GB/1GB" | |
1248 | split: 3GB are mapped so that each process sees a 3GB virtual memory | |
1249 | space and the remaining part of the 4GB virtual memory space is used | |
1250 | by the kernel to permanently map as much physical memory as | |
1251 | possible. | |
1252 | ||
1253 | If the machine has between 1 and 4 Gigabytes physical RAM, then | |
1254 | answer "4GB" here. | |
1255 | ||
1256 | If more than 4 Gigabytes is used then answer "64GB" here. This | |
1257 | selection turns Intel PAE (Physical Address Extension) mode on. | |
1258 | PAE implements 3-level paging on IA32 processors. PAE is fully | |
1259 | supported by Linux, PAE mode is implemented on all recent Intel | |
1260 | processors (Pentium Pro and better). NOTE: If you say "64GB" here, | |
1261 | then the kernel will not boot on CPUs that don't support PAE! | |
1262 | ||
1263 | The actual amount of total physical memory will either be | |
1264 | auto detected or can be forced by using a kernel command line option | |
1265 | such as "mem=256M". (Try "man bootparam" or see the documentation of | |
1266 | your boot loader (lilo or loadlin) about how to pass options to the | |
1267 | kernel at boot time.) | |
1268 | ||
1269 | If unsure, say "off". | |
1270 | ||
1271 | config HIGHMEM4G | |
1272 | bool "4GB" | |
8f9ca475 | 1273 | ---help--- |
506f1d07 SR |
1274 | Select this if you have a 32-bit processor and between 1 and 4 |
1275 | gigabytes of physical RAM. | |
1276 | ||
1277 | config HIGHMEM64G | |
1278 | bool "64GB" | |
eb068e78 | 1279 | depends on !M486 |
506f1d07 | 1280 | select X86_PAE |
8f9ca475 | 1281 | ---help--- |
506f1d07 SR |
1282 | Select this if you have a 32-bit processor and more than 4 |
1283 | gigabytes of physical RAM. | |
1284 | ||
1285 | endchoice | |
1286 | ||
1287 | choice | |
6a108a14 | 1288 | prompt "Memory split" if EXPERT |
506f1d07 SR |
1289 | default VMSPLIT_3G |
1290 | depends on X86_32 | |
8f9ca475 | 1291 | ---help--- |
506f1d07 SR |
1292 | Select the desired split between kernel and user memory. |
1293 | ||
1294 | If the address range available to the kernel is less than the | |
1295 | physical memory installed, the remaining memory will be available | |
1296 | as "high memory". Accessing high memory is a little more costly | |
1297 | than low memory, as it needs to be mapped into the kernel first. | |
1298 | Note that increasing the kernel address space limits the range | |
1299 | available to user programs, making the address space there | |
1300 | tighter. Selecting anything other than the default 3G/1G split | |
1301 | will also likely make your kernel incompatible with binary-only | |
1302 | kernel modules. | |
1303 | ||
1304 | If you are not absolutely sure what you are doing, leave this | |
1305 | option alone! | |
1306 | ||
1307 | config VMSPLIT_3G | |
1308 | bool "3G/1G user/kernel split" | |
1309 | config VMSPLIT_3G_OPT | |
1310 | depends on !X86_PAE | |
1311 | bool "3G/1G user/kernel split (for full 1G low memory)" | |
1312 | config VMSPLIT_2G | |
1313 | bool "2G/2G user/kernel split" | |
1314 | config VMSPLIT_2G_OPT | |
1315 | depends on !X86_PAE | |
1316 | bool "2G/2G user/kernel split (for full 2G low memory)" | |
1317 | config VMSPLIT_1G | |
1318 | bool "1G/3G user/kernel split" | |
1319 | endchoice | |
1320 | ||
1321 | config PAGE_OFFSET | |
1322 | hex | |
1323 | default 0xB0000000 if VMSPLIT_3G_OPT | |
1324 | default 0x80000000 if VMSPLIT_2G | |
1325 | default 0x78000000 if VMSPLIT_2G_OPT | |
1326 | default 0x40000000 if VMSPLIT_1G | |
1327 | default 0xC0000000 | |
1328 | depends on X86_32 | |
1329 | ||
1330 | config HIGHMEM | |
3c2362e6 | 1331 | def_bool y |
506f1d07 | 1332 | depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) |
506f1d07 SR |
1333 | |
1334 | config X86_PAE | |
9ba16087 | 1335 | bool "PAE (Physical Address Extension) Support" |
506f1d07 | 1336 | depends on X86_32 && !HIGHMEM4G |
9d99c712 | 1337 | select SWIOTLB |
8f9ca475 | 1338 | ---help--- |
506f1d07 SR |
1339 | PAE is required for NX support, and furthermore enables |
1340 | larger swapspace support for non-overcommit purposes. It | |
1341 | has the cost of more pagetable lookup overhead, and also | |
1342 | consumes more pagetable space per process. | |
1343 | ||
600715dc | 1344 | config ARCH_PHYS_ADDR_T_64BIT |
3120e25e JB |
1345 | def_bool y |
1346 | depends on X86_64 || X86_PAE | |
600715dc | 1347 | |
66f2b061 | 1348 | config ARCH_DMA_ADDR_T_64BIT |
3120e25e JB |
1349 | def_bool y |
1350 | depends on X86_64 || HIGHMEM64G | |
66f2b061 | 1351 | |
10971ab2 | 1352 | config X86_DIRECT_GBPAGES |
e5008abe LR |
1353 | def_bool y |
1354 | depends on X86_64 && !DEBUG_PAGEALLOC && !KMEMCHECK | |
8f9ca475 | 1355 | ---help--- |
10971ab2 IM |
1356 | Certain kernel features effectively disable kernel |
1357 | linear 1 GB mappings (even if the CPU otherwise | |
1358 | supports them), so don't confuse the user by printing | |
1359 | that we have them enabled. | |
9e899816 | 1360 | |
506f1d07 SR |
1361 | # Common NUMA Features |
1362 | config NUMA | |
fd51b2d7 | 1363 | bool "Numa Memory Allocation and Scheduler Support" |
506f1d07 | 1364 | depends on SMP |
b5660ba7 PA |
1365 | depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP) |
1366 | default y if X86_BIGSMP | |
8f9ca475 | 1367 | ---help--- |
506f1d07 | 1368 | Enable NUMA (Non Uniform Memory Access) support. |
fd51b2d7 | 1369 | |
506f1d07 SR |
1370 | The kernel will try to allocate memory used by a CPU on the |
1371 | local memory controller of the CPU and add some more | |
1372 | NUMA awareness to the kernel. | |
1373 | ||
c280ea5e | 1374 | For 64-bit this is recommended if the system is Intel Core i7 |
fd51b2d7 KM |
1375 | (or later), AMD Opteron, or EM64T NUMA. |
1376 | ||
b5660ba7 | 1377 | For 32-bit this is only needed if you boot a 32-bit |
7cf6c945 | 1378 | kernel on a 64-bit NUMA platform. |
fd51b2d7 KM |
1379 | |
1380 | Otherwise, you should say N. | |
506f1d07 | 1381 | |
eec1d4fa | 1382 | config AMD_NUMA |
3c2362e6 HH |
1383 | def_bool y |
1384 | prompt "Old style AMD Opteron NUMA detection" | |
5da0ef9a | 1385 | depends on X86_64 && NUMA && PCI |
8f9ca475 | 1386 | ---help--- |
eec1d4fa HR |
1387 | Enable AMD NUMA node topology detection. You should say Y here if |
1388 | you have a multi processor AMD system. This uses an old method to | |
1389 | read the NUMA configuration directly from the builtin Northbridge | |
1390 | of Opteron. It is recommended to use X86_64_ACPI_NUMA instead, | |
1391 | which also takes priority if both are compiled in. | |
506f1d07 SR |
1392 | |
1393 | config X86_64_ACPI_NUMA | |
3c2362e6 HH |
1394 | def_bool y |
1395 | prompt "ACPI NUMA detection" | |
506f1d07 SR |
1396 | depends on X86_64 && NUMA && ACPI && PCI |
1397 | select ACPI_NUMA | |
8f9ca475 | 1398 | ---help--- |
506f1d07 SR |
1399 | Enable ACPI SRAT based node topology detection. |
1400 | ||
6ec6e0d9 SS |
1401 | # Some NUMA nodes have memory ranges that span |
1402 | # other nodes. Even though a pfn is valid and | |
1403 | # between a node's start and end pfns, it may not | |
1404 | # reside on that node. See memmap_init_zone() | |
1405 | # for details. | |
1406 | config NODES_SPAN_OTHER_NODES | |
1407 | def_bool y | |
1408 | depends on X86_64_ACPI_NUMA | |
1409 | ||
506f1d07 SR |
1410 | config NUMA_EMU |
1411 | bool "NUMA emulation" | |
1b7e03ef | 1412 | depends on NUMA |
8f9ca475 | 1413 | ---help--- |
506f1d07 SR |
1414 | Enable NUMA emulation. A flat machine will be split |
1415 | into virtual nodes when booted with "numa=fake=N", where N is the | |
1416 | number of nodes. This is only useful for debugging. | |
1417 | ||
1418 | config NODES_SHIFT | |
d25e26b6 | 1419 | int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP |
51591e31 DR |
1420 | range 1 10 |
1421 | default "10" if MAXSMP | |
506f1d07 | 1422 | default "6" if X86_64 |
506f1d07 SR |
1423 | default "3" |
1424 | depends on NEED_MULTIPLE_NODES | |
8f9ca475 | 1425 | ---help--- |
1184dc2f | 1426 | Specify the maximum number of NUMA Nodes available on the target |
692105b8 | 1427 | system. Increases memory reserved to accommodate various tables. |
506f1d07 | 1428 | |
506f1d07 | 1429 | config ARCH_HAVE_MEMORY_PRESENT |
3c2362e6 | 1430 | def_bool y |
506f1d07 | 1431 | depends on X86_32 && DISCONTIGMEM |
506f1d07 SR |
1432 | |
1433 | config NEED_NODE_MEMMAP_SIZE | |
3c2362e6 | 1434 | def_bool y |
506f1d07 | 1435 | depends on X86_32 && (DISCONTIGMEM || SPARSEMEM) |
506f1d07 | 1436 | |
506f1d07 SR |
1437 | config ARCH_FLATMEM_ENABLE |
1438 | def_bool y | |
3b16651f | 1439 | depends on X86_32 && !NUMA |
506f1d07 SR |
1440 | |
1441 | config ARCH_DISCONTIGMEM_ENABLE | |
1442 | def_bool y | |
b263295d | 1443 | depends on NUMA && X86_32 |
506f1d07 SR |
1444 | |
1445 | config ARCH_DISCONTIGMEM_DEFAULT | |
1446 | def_bool y | |
b263295d CL |
1447 | depends on NUMA && X86_32 |
1448 | ||
506f1d07 SR |
1449 | config ARCH_SPARSEMEM_ENABLE |
1450 | def_bool y | |
6ea30386 | 1451 | depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD |
506f1d07 SR |
1452 | select SPARSEMEM_STATIC if X86_32 |
1453 | select SPARSEMEM_VMEMMAP_ENABLE if X86_64 | |
1454 | ||
3b16651f TH |
1455 | config ARCH_SPARSEMEM_DEFAULT |
1456 | def_bool y | |
1457 | depends on X86_64 | |
1458 | ||
506f1d07 SR |
1459 | config ARCH_SELECT_MEMORY_MODEL |
1460 | def_bool y | |
b263295d | 1461 | depends on ARCH_SPARSEMEM_ENABLE |
506f1d07 SR |
1462 | |
1463 | config ARCH_MEMORY_PROBE | |
a0842b70 | 1464 | bool "Enable sysfs memory/probe interface" |
3120e25e | 1465 | depends on X86_64 && MEMORY_HOTPLUG |
a0842b70 TK |
1466 | help |
1467 | This option enables a sysfs memory/probe interface for testing. | |
1468 | See Documentation/memory-hotplug.txt for more information. | |
1469 | If you are unsure how to answer this question, answer N. | |
506f1d07 | 1470 | |
3b16651f TH |
1471 | config ARCH_PROC_KCORE_TEXT |
1472 | def_bool y | |
1473 | depends on X86_64 && PROC_KCORE | |
1474 | ||
a29815a3 AK |
1475 | config ILLEGAL_POINTER_VALUE |
1476 | hex | |
1477 | default 0 if X86_32 | |
1478 | default 0xdead000000000000 if X86_64 | |
1479 | ||
506f1d07 SR |
1480 | source "mm/Kconfig" |
1481 | ||
7a67832c DW |
1482 | config X86_PMEM_LEGACY_DEVICE |
1483 | bool | |
1484 | ||
ec776ef6 | 1485 | config X86_PMEM_LEGACY |
7a67832c | 1486 | tristate "Support non-standard NVDIMMs and ADR protected memory" |
9f53f9fa DW |
1487 | depends on PHYS_ADDR_T_64BIT |
1488 | depends on BLK_DEV | |
7a67832c | 1489 | select X86_PMEM_LEGACY_DEVICE |
9f53f9fa | 1490 | select LIBNVDIMM |
ec776ef6 CH |
1491 | help |
1492 | Treat memory marked using the non-standard e820 type of 12 as used | |
1493 | by the Intel Sandy Bridge-EP reference BIOS as protected memory. | |
1494 | The kernel will offer these regions to the 'pmem' driver so | |
1495 | they can be used for persistent storage. | |
1496 | ||
1497 | Say Y if unsure. | |
1498 | ||
506f1d07 SR |
1499 | config HIGHPTE |
1500 | bool "Allocate 3rd-level pagetables from highmem" | |
6fc108a0 | 1501 | depends on HIGHMEM |
8f9ca475 | 1502 | ---help--- |
506f1d07 SR |
1503 | The VM uses one page table entry for each page of physical memory. |
1504 | For systems with a lot of RAM, this can be wasteful of precious | |
1505 | low memory. Setting this option will put user-space page table | |
1506 | entries in high memory. | |
1507 | ||
9f077871 | 1508 | config X86_CHECK_BIOS_CORRUPTION |
8f9ca475 IM |
1509 | bool "Check for low memory corruption" |
1510 | ---help--- | |
1511 | Periodically check for memory corruption in low memory, which | |
1512 | is suspected to be caused by BIOS. Even when enabled in the | |
1513 | configuration, it is disabled at runtime. Enable it by | |
1514 | setting "memory_corruption_check=1" on the kernel command | |
1515 | line. By default it scans the low 64k of memory every 60 | |
1516 | seconds; see the memory_corruption_check_size and | |
1517 | memory_corruption_check_period parameters in | |
1518 | Documentation/kernel-parameters.txt to adjust this. | |
1519 | ||
1520 | When enabled with the default parameters, this option has | |
1521 | almost no overhead, as it reserves a relatively small amount | |
1522 | of memory and scans it infrequently. It both detects corruption | |
1523 | and prevents it from affecting the running system. | |
1524 | ||
1525 | It is, however, intended as a diagnostic tool; if repeatable | |
1526 | BIOS-originated corruption always affects the same memory, | |
1527 | you can use memmap= to prevent the kernel from using that | |
1528 | memory. | |
9f077871 | 1529 | |
c885df50 | 1530 | config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK |
8f9ca475 | 1531 | bool "Set the default setting of memory_corruption_check" |
c885df50 JF |
1532 | depends on X86_CHECK_BIOS_CORRUPTION |
1533 | default y | |
8f9ca475 IM |
1534 | ---help--- |
1535 | Set whether the default state of memory_corruption_check is | |
1536 | on or off. | |
c885df50 | 1537 | |
9ea77bdb | 1538 | config X86_RESERVE_LOW |
d0cd7425 PA |
1539 | int "Amount of low memory, in kilobytes, to reserve for the BIOS" |
1540 | default 64 | |
1541 | range 4 640 | |
8f9ca475 | 1542 | ---help--- |
d0cd7425 PA |
1543 | Specify the amount of low memory to reserve for the BIOS. |
1544 | ||
1545 | The first page contains BIOS data structures that the kernel | |
1546 | must not use, so that page must always be reserved. | |
1547 | ||
1548 | By default we reserve the first 64K of physical RAM, as a | |
1549 | number of BIOSes are known to corrupt that memory range | |
1550 | during events such as suspend/resume or monitor cable | |
1551 | insertion, so it must not be used by the kernel. | |
fc381519 | 1552 | |
d0cd7425 PA |
1553 | You can set this to 4 if you are absolutely sure that you |
1554 | trust the BIOS to get all its memory reservations and usages | |
1555 | right. If you know your BIOS have problems beyond the | |
1556 | default 64K area, you can set this to 640 to avoid using the | |
1557 | entire low memory range. | |
fc381519 | 1558 | |
d0cd7425 PA |
1559 | If you have doubts about the BIOS (e.g. suspend/resume does |
1560 | not work or there's kernel crashes after certain hardware | |
1561 | hotplug events) then you might want to enable | |
1562 | X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check | |
1563 | typical corruption patterns. | |
fc381519 | 1564 | |
d0cd7425 | 1565 | Leave this to the default value of 64 if you are unsure. |
fc381519 | 1566 | |
506f1d07 SR |
1567 | config MATH_EMULATION |
1568 | bool | |
a5b9e5a2 | 1569 | depends on MODIFY_LDT_SYSCALL |
506f1d07 SR |
1570 | prompt "Math emulation" if X86_32 |
1571 | ---help--- | |
1572 | Linux can emulate a math coprocessor (used for floating point | |
1573 | operations) if you don't have one. 486DX and Pentium processors have | |
1574 | a math coprocessor built in, 486SX and 386 do not, unless you added | |
1575 | a 487DX or 387, respectively. (The messages during boot time can | |
1576 | give you some hints here ["man dmesg"].) Everyone needs either a | |
1577 | coprocessor or this emulation. | |
1578 | ||
1579 | If you don't have a math coprocessor, you need to say Y here; if you | |
1580 | say Y here even though you have a coprocessor, the coprocessor will | |
1581 | be used nevertheless. (This behavior can be changed with the kernel | |
1582 | command line option "no387", which comes handy if your coprocessor | |
1583 | is broken. Try "man bootparam" or see the documentation of your boot | |
1584 | loader (lilo or loadlin) about how to pass options to the kernel at | |
1585 | boot time.) This means that it is a good idea to say Y here if you | |
1586 | intend to use this kernel on different machines. | |
1587 | ||
1588 | More information about the internals of the Linux math coprocessor | |
1589 | emulation can be found in <file:arch/x86/math-emu/README>. | |
1590 | ||
1591 | If you are not sure, say Y; apart from resulting in a 66 KB bigger | |
1592 | kernel, it won't hurt. | |
1593 | ||
1594 | config MTRR | |
6fc108a0 | 1595 | def_bool y |
6a108a14 | 1596 | prompt "MTRR (Memory Type Range Register) support" if EXPERT |
506f1d07 SR |
1597 | ---help--- |
1598 | On Intel P6 family processors (Pentium Pro, Pentium II and later) | |
1599 | the Memory Type Range Registers (MTRRs) may be used to control | |
1600 | processor access to memory ranges. This is most useful if you have | |
1601 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining | |
1602 | allows bus write transfers to be combined into a larger transfer | |
1603 | before bursting over the PCI/AGP bus. This can increase performance | |
1604 | of image write operations 2.5 times or more. Saying Y here creates a | |
1605 | /proc/mtrr file which may be used to manipulate your processor's | |
1606 | MTRRs. Typically the X server should use this. | |
1607 | ||
1608 | This code has a reasonably generic interface so that similar | |
1609 | control registers on other processors can be easily supported | |
1610 | as well: | |
1611 | ||
1612 | The Cyrix 6x86, 6x86MX and M II processors have Address Range | |
1613 | Registers (ARRs) which provide a similar functionality to MTRRs. For | |
1614 | these, the ARRs are used to emulate the MTRRs. | |
1615 | The AMD K6-2 (stepping 8 and above) and K6-3 processors have two | |
1616 | MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing | |
1617 | write-combining. All of these processors are supported by this code | |
1618 | and it makes sense to say Y here if you have one of them. | |
1619 | ||
1620 | Saying Y here also fixes a problem with buggy SMP BIOSes which only | |
1621 | set the MTRRs for the boot CPU and not for the secondary CPUs. This | |
1622 | can lead to all sorts of problems, so it's good to say Y here. | |
1623 | ||
1624 | You can safely say Y even if your machine doesn't have MTRRs, you'll | |
1625 | just add about 9 KB to your kernel. | |
1626 | ||
7225e751 | 1627 | See <file:Documentation/x86/mtrr.txt> for more information. |
506f1d07 | 1628 | |
95ffa243 | 1629 | config MTRR_SANITIZER |
2ffb3501 | 1630 | def_bool y |
95ffa243 YL |
1631 | prompt "MTRR cleanup support" |
1632 | depends on MTRR | |
8f9ca475 | 1633 | ---help--- |
aba3728c TG |
1634 | Convert MTRR layout from continuous to discrete, so X drivers can |
1635 | add writeback entries. | |
95ffa243 | 1636 | |
aba3728c | 1637 | Can be disabled with disable_mtrr_cleanup on the kernel command line. |
692105b8 | 1638 | The largest mtrr entry size for a continuous block can be set with |
aba3728c | 1639 | mtrr_chunk_size. |
95ffa243 | 1640 | |
2ffb3501 | 1641 | If unsure, say Y. |
95ffa243 YL |
1642 | |
1643 | config MTRR_SANITIZER_ENABLE_DEFAULT | |
f5098d62 YL |
1644 | int "MTRR cleanup enable value (0-1)" |
1645 | range 0 1 | |
1646 | default "0" | |
95ffa243 | 1647 | depends on MTRR_SANITIZER |
8f9ca475 | 1648 | ---help--- |
f5098d62 | 1649 | Enable mtrr cleanup default value |
95ffa243 | 1650 | |
12031a62 YL |
1651 | config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT |
1652 | int "MTRR cleanup spare reg num (0-7)" | |
1653 | range 0 7 | |
1654 | default "1" | |
1655 | depends on MTRR_SANITIZER | |
8f9ca475 | 1656 | ---help--- |
12031a62 | 1657 | mtrr cleanup spare entries default, it can be changed via |
aba3728c | 1658 | mtrr_spare_reg_nr=N on the kernel command line. |
12031a62 | 1659 | |
2e5d9c85 | 1660 | config X86_PAT |
6fc108a0 | 1661 | def_bool y |
6a108a14 | 1662 | prompt "x86 PAT support" if EXPERT |
2a8a2719 | 1663 | depends on MTRR |
8f9ca475 | 1664 | ---help--- |
2e5d9c85 | 1665 | Use PAT attributes to setup page level cache control. |
042b78e4 | 1666 | |
2e5d9c85 | 1667 | PATs are the modern equivalents of MTRRs and are much more |
1668 | flexible than MTRRs. | |
1669 | ||
1670 | Say N here if you see bootup problems (boot crash, boot hang, | |
042b78e4 | 1671 | spontaneous reboots) or a non-working video driver. |
2e5d9c85 | 1672 | |
1673 | If unsure, say Y. | |
1674 | ||
46cf98cd VP |
1675 | config ARCH_USES_PG_UNCACHED |
1676 | def_bool y | |
1677 | depends on X86_PAT | |
1678 | ||
628c6246 PA |
1679 | config ARCH_RANDOM |
1680 | def_bool y | |
1681 | prompt "x86 architectural random number generator" if EXPERT | |
1682 | ---help--- | |
1683 | Enable the x86 architectural RDRAND instruction | |
1684 | (Intel Bull Mountain technology) to generate random numbers. | |
1685 | If supported, this is a high bandwidth, cryptographically | |
1686 | secure hardware random number generator. | |
1687 | ||
51ae4a2d PA |
1688 | config X86_SMAP |
1689 | def_bool y | |
1690 | prompt "Supervisor Mode Access Prevention" if EXPERT | |
1691 | ---help--- | |
1692 | Supervisor Mode Access Prevention (SMAP) is a security | |
1693 | feature in newer Intel processors. There is a small | |
1694 | performance cost if this enabled and turned on; there is | |
1695 | also a small increase in the kernel size if this is enabled. | |
1696 | ||
1697 | If unsure, say Y. | |
1698 | ||
72e9b5fe DH |
1699 | config X86_INTEL_MPX |
1700 | prompt "Intel MPX (Memory Protection Extensions)" | |
1701 | def_bool n | |
1702 | depends on CPU_SUP_INTEL | |
1703 | ---help--- | |
1704 | MPX provides hardware features that can be used in | |
1705 | conjunction with compiler-instrumented code to check | |
1706 | memory references. It is designed to detect buffer | |
1707 | overflow or underflow bugs. | |
1708 | ||
1709 | This option enables running applications which are | |
1710 | instrumented or otherwise use MPX. It does not use MPX | |
1711 | itself inside the kernel or to protect the kernel | |
1712 | against bad memory references. | |
1713 | ||
1714 | Enabling this option will make the kernel larger: | |
1715 | ~8k of kernel text and 36 bytes of data on a 64-bit | |
1716 | defconfig. It adds a long to the 'mm_struct' which | |
1717 | will increase the kernel memory overhead of each | |
1718 | process and adds some branches to paths used during | |
1719 | exec() and munmap(). | |
1720 | ||
1721 | For details, see Documentation/x86/intel_mpx.txt | |
1722 | ||
1723 | If unsure, say N. | |
1724 | ||
35e97790 | 1725 | config X86_INTEL_MEMORY_PROTECTION_KEYS |
284244a9 | 1726 | prompt "Intel Memory Protection Keys" |
35e97790 | 1727 | def_bool y |
284244a9 | 1728 | # Note: only available in 64-bit mode |
35e97790 | 1729 | depends on CPU_SUP_INTEL && X86_64 |
284244a9 DH |
1730 | ---help--- |
1731 | Memory Protection Keys provides a mechanism for enforcing | |
1732 | page-based protections, but without requiring modification of the | |
1733 | page tables when an application changes protection domains. | |
1734 | ||
1735 | For details, see Documentation/x86/protection-keys.txt | |
1736 | ||
1737 | If unsure, say y. | |
35e97790 | 1738 | |
506f1d07 | 1739 | config EFI |
9ba16087 | 1740 | bool "EFI runtime service support" |
5b83683f | 1741 | depends on ACPI |
f6ce5002 | 1742 | select UCS2_STRING |
022ee6c5 | 1743 | select EFI_RUNTIME_WRAPPERS |
506f1d07 | 1744 | ---help--- |
8f9ca475 IM |
1745 | This enables the kernel to use EFI runtime services that are |
1746 | available (such as the EFI variable services). | |
506f1d07 | 1747 | |
8f9ca475 IM |
1748 | This option is only useful on systems that have EFI firmware. |
1749 | In addition, you should use the latest ELILO loader available | |
1750 | at <http://elilo.sourceforge.net> in order to take advantage | |
1751 | of EFI runtime services. However, even with this option, the | |
1752 | resultant kernel should continue to boot on existing non-EFI | |
1753 | platforms. | |
506f1d07 | 1754 | |
291f3632 MF |
1755 | config EFI_STUB |
1756 | bool "EFI stub support" | |
b16d8c23 | 1757 | depends on EFI && !X86_USE_3DNOW |
7b2a583a | 1758 | select RELOCATABLE |
291f3632 MF |
1759 | ---help--- |
1760 | This kernel feature allows a bzImage to be loaded directly | |
1761 | by EFI firmware without the use of a bootloader. | |
1762 | ||
4172fe2f | 1763 | See Documentation/efi-stub.txt for more information. |
0c759662 | 1764 | |
7d453eee MF |
1765 | config EFI_MIXED |
1766 | bool "EFI mixed-mode support" | |
1767 | depends on EFI_STUB && X86_64 | |
1768 | ---help--- | |
1769 | Enabling this feature allows a 64-bit kernel to be booted | |
1770 | on a 32-bit firmware, provided that your CPU supports 64-bit | |
1771 | mode. | |
1772 | ||
1773 | Note that it is not possible to boot a mixed-mode enabled | |
1774 | kernel via the EFI boot stub - a bootloader that supports | |
1775 | the EFI handover protocol must be used. | |
1776 | ||
1777 | If unsure, say N. | |
1778 | ||
506f1d07 | 1779 | config SECCOMP |
3c2362e6 HH |
1780 | def_bool y |
1781 | prompt "Enable seccomp to safely compute untrusted bytecode" | |
8f9ca475 | 1782 | ---help--- |
506f1d07 SR |
1783 | This kernel feature is useful for number crunching applications |
1784 | that may need to compute untrusted bytecode during their | |
1785 | execution. By using pipes or other transports made available to | |
1786 | the process as file descriptors supporting the read/write | |
1787 | syscalls, it's possible to isolate those applications in | |
1788 | their own address space using seccomp. Once seccomp is | |
9c0bbee8 | 1789 | enabled via prctl(PR_SET_SECCOMP), it cannot be disabled |
506f1d07 SR |
1790 | and the task is only allowed to execute a few safe syscalls |
1791 | defined by each seccomp mode. | |
1792 | ||
1793 | If unsure, say Y. Only embedded should say N here. | |
1794 | ||
506f1d07 SR |
1795 | source kernel/Kconfig.hz |
1796 | ||
1797 | config KEXEC | |
1798 | bool "kexec system call" | |
2965faa5 | 1799 | select KEXEC_CORE |
8f9ca475 | 1800 | ---help--- |
506f1d07 SR |
1801 | kexec is a system call that implements the ability to shutdown your |
1802 | current kernel, and to start another kernel. It is like a reboot | |
1803 | but it is independent of the system firmware. And like a reboot | |
1804 | you can start any kernel with it, not just Linux. | |
1805 | ||
1806 | The name comes from the similarity to the exec system call. | |
1807 | ||
1808 | It is an ongoing process to be certain the hardware in a machine | |
1809 | is properly shutdown, so do not be surprised if this code does not | |
bf220695 GU |
1810 | initially work for you. As of this writing the exact hardware |
1811 | interface is strongly in flux, so no good recommendation can be | |
1812 | made. | |
506f1d07 | 1813 | |
74ca317c VG |
1814 | config KEXEC_FILE |
1815 | bool "kexec file based system call" | |
2965faa5 | 1816 | select KEXEC_CORE |
74ca317c | 1817 | select BUILD_BIN2C |
74ca317c VG |
1818 | depends on X86_64 |
1819 | depends on CRYPTO=y | |
1820 | depends on CRYPTO_SHA256=y | |
1821 | ---help--- | |
1822 | This is new version of kexec system call. This system call is | |
1823 | file based and takes file descriptors as system call argument | |
1824 | for kernel and initramfs as opposed to list of segments as | |
1825 | accepted by previous system call. | |
1826 | ||
8e7d8381 VG |
1827 | config KEXEC_VERIFY_SIG |
1828 | bool "Verify kernel signature during kexec_file_load() syscall" | |
74ca317c | 1829 | depends on KEXEC_FILE |
8e7d8381 VG |
1830 | ---help--- |
1831 | This option makes kernel signature verification mandatory for | |
d8eb8940 BP |
1832 | the kexec_file_load() syscall. |
1833 | ||
1834 | In addition to that option, you need to enable signature | |
1835 | verification for the corresponding kernel image type being | |
1836 | loaded in order for this to work. | |
8e7d8381 VG |
1837 | |
1838 | config KEXEC_BZIMAGE_VERIFY_SIG | |
1839 | bool "Enable bzImage signature verification support" | |
1840 | depends on KEXEC_VERIFY_SIG | |
1841 | depends on SIGNED_PE_FILE_VERIFICATION | |
1842 | select SYSTEM_TRUSTED_KEYRING | |
1843 | ---help--- | |
1844 | Enable bzImage signature verification support. | |
1845 | ||
506f1d07 | 1846 | config CRASH_DUMP |
04b69447 | 1847 | bool "kernel crash dumps" |
506f1d07 | 1848 | depends on X86_64 || (X86_32 && HIGHMEM) |
8f9ca475 | 1849 | ---help--- |
506f1d07 SR |
1850 | Generate crash dump after being started by kexec. |
1851 | This should be normally only set in special crash dump kernels | |
1852 | which are loaded in the main kernel with kexec-tools into | |
1853 | a specially reserved region and then later executed after | |
1854 | a crash by kdump/kexec. The crash dump kernel must be compiled | |
1855 | to a memory address not used by the main kernel or BIOS using | |
1856 | PHYSICAL_START, or it must be built as a relocatable image | |
1857 | (CONFIG_RELOCATABLE=y). | |
1858 | For more details see Documentation/kdump/kdump.txt | |
1859 | ||
3ab83521 | 1860 | config KEXEC_JUMP |
6ea30386 | 1861 | bool "kexec jump" |
fee7b0d8 | 1862 | depends on KEXEC && HIBERNATION |
8f9ca475 | 1863 | ---help--- |
89081d17 HY |
1864 | Jump between original kernel and kexeced kernel and invoke |
1865 | code in physical address mode via KEXEC | |
3ab83521 | 1866 | |
506f1d07 | 1867 | config PHYSICAL_START |
6a108a14 | 1868 | hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP) |
ceefccc9 | 1869 | default "0x1000000" |
8f9ca475 | 1870 | ---help--- |
506f1d07 SR |
1871 | This gives the physical address where the kernel is loaded. |
1872 | ||
1873 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then | |
1874 | bzImage will decompress itself to above physical address and | |
1875 | run from there. Otherwise, bzImage will run from the address where | |
1876 | it has been loaded by the boot loader and will ignore above physical | |
1877 | address. | |
1878 | ||
1879 | In normal kdump cases one does not have to set/change this option | |
1880 | as now bzImage can be compiled as a completely relocatable image | |
1881 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different | |
1882 | address. This option is mainly useful for the folks who don't want | |
1883 | to use a bzImage for capturing the crash dump and want to use a | |
1884 | vmlinux instead. vmlinux is not relocatable hence a kernel needs | |
1885 | to be specifically compiled to run from a specific memory area | |
1886 | (normally a reserved region) and this option comes handy. | |
1887 | ||
ceefccc9 PA |
1888 | So if you are using bzImage for capturing the crash dump, |
1889 | leave the value here unchanged to 0x1000000 and set | |
1890 | CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux | |
1891 | for capturing the crash dump change this value to start of | |
1892 | the reserved region. In other words, it can be set based on | |
1893 | the "X" value as specified in the "crashkernel=YM@XM" | |
1894 | command line boot parameter passed to the panic-ed | |
1895 | kernel. Please take a look at Documentation/kdump/kdump.txt | |
1896 | for more details about crash dumps. | |
506f1d07 SR |
1897 | |
1898 | Usage of bzImage for capturing the crash dump is recommended as | |
1899 | one does not have to build two kernels. Same kernel can be used | |
1900 | as production kernel and capture kernel. Above option should have | |
1901 | gone away after relocatable bzImage support is introduced. But it | |
1902 | is present because there are users out there who continue to use | |
1903 | vmlinux for dump capture. This option should go away down the | |
1904 | line. | |
1905 | ||
1906 | Don't change this unless you know what you are doing. | |
1907 | ||
1908 | config RELOCATABLE | |
26717808 PA |
1909 | bool "Build a relocatable kernel" |
1910 | default y | |
8f9ca475 | 1911 | ---help--- |
506f1d07 SR |
1912 | This builds a kernel image that retains relocation information |
1913 | so it can be loaded someplace besides the default 1MB. | |
1914 | The relocations tend to make the kernel binary about 10% larger, | |
1915 | but are discarded at runtime. | |
1916 | ||
1917 | One use is for the kexec on panic case where the recovery kernel | |
1918 | must live at a different physical address than the primary | |
1919 | kernel. | |
1920 | ||
1921 | Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address | |
1922 | it has been loaded at and the compile time physical address | |
8ab3820f | 1923 | (CONFIG_PHYSICAL_START) is used as the minimum location. |
506f1d07 | 1924 | |
8ab3820f | 1925 | config RANDOMIZE_BASE |
e8581e3d | 1926 | bool "Randomize the address of the kernel image (KASLR)" |
8ab3820f | 1927 | depends on RELOCATABLE |
8ab3820f KC |
1928 | default n |
1929 | ---help--- | |
e8581e3d BH |
1930 | In support of Kernel Address Space Layout Randomization (KASLR), |
1931 | this randomizes the physical address at which the kernel image | |
1932 | is decompressed and the virtual address where the kernel | |
1933 | image is mapped, as a security feature that deters exploit | |
1934 | attempts relying on knowledge of the location of kernel | |
1935 | code internals. | |
1936 | ||
1937 | The kernel physical and virtual address can be randomized | |
1938 | from 16MB up to 1GB on 64-bit and 512MB on 32-bit. (Note that | |
1939 | using RANDOMIZE_BASE reduces the memory space available to | |
1940 | kernel modules from 1.5GB to 1GB.) | |
1941 | ||
1942 | Entropy is generated using the RDRAND instruction if it is | |
1943 | supported. If RDTSC is supported, its value is mixed into | |
1944 | the entropy pool as well. If neither RDRAND nor RDTSC are | |
1945 | supported, then entropy is read from the i8254 timer. | |
1946 | ||
1947 | Since the kernel is built using 2GB addressing, and | |
1948 | PHYSICAL_ALIGN must be at a minimum of 2MB, only 10 bits of | |
1949 | entropy is theoretically possible. Currently, with the | |
1950 | default value for PHYSICAL_ALIGN and due to page table | |
1951 | layouts, 64-bit uses 9 bits of entropy and 32-bit uses 8 bits. | |
1952 | ||
1953 | If CONFIG_HIBERNATE is also enabled, KASLR is disabled at boot | |
1954 | time. To enable it, boot with "kaslr" on the kernel command | |
1955 | line (which will also disable hibernation). | |
8ab3820f | 1956 | |
e8581e3d | 1957 | If unsure, say N. |
8ab3820f KC |
1958 | |
1959 | # Relocation on x86 needs some additional build support | |
845adf72 PA |
1960 | config X86_NEED_RELOCS |
1961 | def_bool y | |
8ab3820f | 1962 | depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE) |
845adf72 | 1963 | |
506f1d07 | 1964 | config PHYSICAL_ALIGN |
a0215061 | 1965 | hex "Alignment value to which kernel should be aligned" |
8ab3820f | 1966 | default "0x200000" |
a0215061 KC |
1967 | range 0x2000 0x1000000 if X86_32 |
1968 | range 0x200000 0x1000000 if X86_64 | |
8f9ca475 | 1969 | ---help--- |
506f1d07 SR |
1970 | This value puts the alignment restrictions on physical address |
1971 | where kernel is loaded and run from. Kernel is compiled for an | |
1972 | address which meets above alignment restriction. | |
1973 | ||
1974 | If bootloader loads the kernel at a non-aligned address and | |
1975 | CONFIG_RELOCATABLE is set, kernel will move itself to nearest | |
1976 | address aligned to above value and run from there. | |
1977 | ||
1978 | If bootloader loads the kernel at a non-aligned address and | |
1979 | CONFIG_RELOCATABLE is not set, kernel will ignore the run time | |
1980 | load address and decompress itself to the address it has been | |
1981 | compiled for and run from there. The address for which kernel is | |
1982 | compiled already meets above alignment restrictions. Hence the | |
1983 | end result is that kernel runs from a physical address meeting | |
1984 | above alignment restrictions. | |
1985 | ||
a0215061 KC |
1986 | On 32-bit this value must be a multiple of 0x2000. On 64-bit |
1987 | this value must be a multiple of 0x200000. | |
1988 | ||
506f1d07 SR |
1989 | Don't change this unless you know what you are doing. |
1990 | ||
1991 | config HOTPLUG_CPU | |
7c13e6a3 | 1992 | bool "Support for hot-pluggable CPUs" |
40b31360 | 1993 | depends on SMP |
506f1d07 | 1994 | ---help--- |
7c13e6a3 DS |
1995 | Say Y here to allow turning CPUs off and on. CPUs can be |
1996 | controlled through /sys/devices/system/cpu. | |
1997 | ( Note: power management support will enable this option | |
1998 | automatically on SMP systems. ) | |
1999 | Say N if you want to disable CPU hotplug. | |
506f1d07 | 2000 | |
80aa1dff FY |
2001 | config BOOTPARAM_HOTPLUG_CPU0 |
2002 | bool "Set default setting of cpu0_hotpluggable" | |
2003 | default n | |
2c922cd0 | 2004 | depends on HOTPLUG_CPU |
80aa1dff FY |
2005 | ---help--- |
2006 | Set whether default state of cpu0_hotpluggable is on or off. | |
2007 | ||
2008 | Say Y here to enable CPU0 hotplug by default. If this switch | |
2009 | is turned on, there is no need to give cpu0_hotplug kernel | |
2010 | parameter and the CPU0 hotplug feature is enabled by default. | |
2011 | ||
2012 | Please note: there are two known CPU0 dependencies if you want | |
2013 | to enable the CPU0 hotplug feature either by this switch or by | |
2014 | cpu0_hotplug kernel parameter. | |
2015 | ||
2016 | First, resume from hibernate or suspend always starts from CPU0. | |
2017 | So hibernate and suspend are prevented if CPU0 is offline. | |
2018 | ||
2019 | Second dependency is PIC interrupts always go to CPU0. CPU0 can not | |
2020 | offline if any interrupt can not migrate out of CPU0. There may | |
2021 | be other CPU0 dependencies. | |
2022 | ||
2023 | Please make sure the dependencies are under your control before | |
2024 | you enable this feature. | |
2025 | ||
2026 | Say N if you don't want to enable CPU0 hotplug feature by default. | |
2027 | You still can enable the CPU0 hotplug feature at boot by kernel | |
2028 | parameter cpu0_hotplug. | |
2029 | ||
a71c8bc5 FY |
2030 | config DEBUG_HOTPLUG_CPU0 |
2031 | def_bool n | |
2032 | prompt "Debug CPU0 hotplug" | |
2c922cd0 | 2033 | depends on HOTPLUG_CPU |
a71c8bc5 FY |
2034 | ---help--- |
2035 | Enabling this option offlines CPU0 (if CPU0 can be offlined) as | |
2036 | soon as possible and boots up userspace with CPU0 offlined. User | |
2037 | can online CPU0 back after boot time. | |
2038 | ||
2039 | To debug CPU0 hotplug, you need to enable CPU0 offline/online | |
2040 | feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during | |
2041 | compilation or giving cpu0_hotplug kernel parameter at boot. | |
2042 | ||
2043 | If unsure, say N. | |
2044 | ||
506f1d07 | 2045 | config COMPAT_VDSO |
b0b49f26 AL |
2046 | def_bool n |
2047 | prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)" | |
af65d648 | 2048 | depends on X86_32 || IA32_EMULATION |
8f9ca475 | 2049 | ---help--- |
b0b49f26 AL |
2050 | Certain buggy versions of glibc will crash if they are |
2051 | presented with a 32-bit vDSO that is not mapped at the address | |
2052 | indicated in its segment table. | |
e84446de | 2053 | |
b0b49f26 AL |
2054 | The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a |
2055 | and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and | |
2056 | 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is | |
2057 | the only released version with the bug, but OpenSUSE 9 | |
2058 | contains a buggy "glibc 2.3.2". | |
506f1d07 | 2059 | |
b0b49f26 AL |
2060 | The symptom of the bug is that everything crashes on startup, saying: |
2061 | dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed! | |
2062 | ||
2063 | Saying Y here changes the default value of the vdso32 boot | |
2064 | option from 1 to 0, which turns off the 32-bit vDSO entirely. | |
2065 | This works around the glibc bug but hurts performance. | |
2066 | ||
2067 | If unsure, say N: if you are compiling your own kernel, you | |
2068 | are unlikely to be using a buggy version of glibc. | |
506f1d07 | 2069 | |
3dc33bd3 KC |
2070 | choice |
2071 | prompt "vsyscall table for legacy applications" | |
2072 | depends on X86_64 | |
2073 | default LEGACY_VSYSCALL_EMULATE | |
2074 | help | |
2075 | Legacy user code that does not know how to find the vDSO expects | |
2076 | to be able to issue three syscalls by calling fixed addresses in | |
2077 | kernel space. Since this location is not randomized with ASLR, | |
2078 | it can be used to assist security vulnerability exploitation. | |
2079 | ||
2080 | This setting can be changed at boot time via the kernel command | |
2081 | line parameter vsyscall=[native|emulate|none]. | |
2082 | ||
2083 | On a system with recent enough glibc (2.14 or newer) and no | |
2084 | static binaries, you can say None without a performance penalty | |
2085 | to improve security. | |
2086 | ||
2087 | If unsure, select "Emulate". | |
2088 | ||
2089 | config LEGACY_VSYSCALL_NATIVE | |
2090 | bool "Native" | |
2091 | help | |
2092 | Actual executable code is located in the fixed vsyscall | |
2093 | address mapping, implementing time() efficiently. Since | |
2094 | this makes the mapping executable, it can be used during | |
2095 | security vulnerability exploitation (traditionally as | |
2096 | ROP gadgets). This configuration is not recommended. | |
2097 | ||
2098 | config LEGACY_VSYSCALL_EMULATE | |
2099 | bool "Emulate" | |
2100 | help | |
2101 | The kernel traps and emulates calls into the fixed | |
2102 | vsyscall address mapping. This makes the mapping | |
2103 | non-executable, but it still contains known contents, | |
2104 | which could be used in certain rare security vulnerability | |
2105 | exploits. This configuration is recommended when userspace | |
2106 | still uses the vsyscall area. | |
2107 | ||
2108 | config LEGACY_VSYSCALL_NONE | |
2109 | bool "None" | |
2110 | help | |
2111 | There will be no vsyscall mapping at all. This will | |
2112 | eliminate any risk of ASLR bypass due to the vsyscall | |
2113 | fixed address mapping. Attempts to use the vsyscalls | |
2114 | will be reported to dmesg, so that either old or | |
2115 | malicious userspace programs can be identified. | |
2116 | ||
2117 | endchoice | |
2118 | ||
516cbf37 TB |
2119 | config CMDLINE_BOOL |
2120 | bool "Built-in kernel command line" | |
8f9ca475 | 2121 | ---help--- |
516cbf37 TB |
2122 | Allow for specifying boot arguments to the kernel at |
2123 | build time. On some systems (e.g. embedded ones), it is | |
2124 | necessary or convenient to provide some or all of the | |
2125 | kernel boot arguments with the kernel itself (that is, | |
2126 | to not rely on the boot loader to provide them.) | |
2127 | ||
2128 | To compile command line arguments into the kernel, | |
2129 | set this option to 'Y', then fill in the | |
69711ca1 | 2130 | boot arguments in CONFIG_CMDLINE. |
516cbf37 TB |
2131 | |
2132 | Systems with fully functional boot loaders (i.e. non-embedded) | |
2133 | should leave this option set to 'N'. | |
2134 | ||
2135 | config CMDLINE | |
2136 | string "Built-in kernel command string" | |
2137 | depends on CMDLINE_BOOL | |
2138 | default "" | |
8f9ca475 | 2139 | ---help--- |
516cbf37 TB |
2140 | Enter arguments here that should be compiled into the kernel |
2141 | image and used at boot time. If the boot loader provides a | |
2142 | command line at boot time, it is appended to this string to | |
2143 | form the full kernel command line, when the system boots. | |
2144 | ||
2145 | However, you can use the CONFIG_CMDLINE_OVERRIDE option to | |
2146 | change this behavior. | |
2147 | ||
2148 | In most cases, the command line (whether built-in or provided | |
2149 | by the boot loader) should specify the device for the root | |
2150 | file system. | |
2151 | ||
2152 | config CMDLINE_OVERRIDE | |
2153 | bool "Built-in command line overrides boot loader arguments" | |
516cbf37 | 2154 | depends on CMDLINE_BOOL |
8f9ca475 | 2155 | ---help--- |
516cbf37 TB |
2156 | Set this option to 'Y' to have the kernel ignore the boot loader |
2157 | command line, and use ONLY the built-in command line. | |
2158 | ||
2159 | This is used to work around broken boot loaders. This should | |
2160 | be set to 'N' under normal conditions. | |
2161 | ||
a5b9e5a2 AL |
2162 | config MODIFY_LDT_SYSCALL |
2163 | bool "Enable the LDT (local descriptor table)" if EXPERT | |
2164 | default y | |
2165 | ---help--- | |
2166 | Linux can allow user programs to install a per-process x86 | |
2167 | Local Descriptor Table (LDT) using the modify_ldt(2) system | |
2168 | call. This is required to run 16-bit or segmented code such as | |
2169 | DOSEMU or some Wine programs. It is also used by some very old | |
2170 | threading libraries. | |
2171 | ||
2172 | Enabling this feature adds a small amount of overhead to | |
2173 | context switches and increases the low-level kernel attack | |
2174 | surface. Disabling it removes the modify_ldt(2) system call. | |
2175 | ||
2176 | Saying 'N' here may make sense for embedded or server kernels. | |
2177 | ||
b700e7f0 SJ |
2178 | source "kernel/livepatch/Kconfig" |
2179 | ||
506f1d07 SR |
2180 | endmenu |
2181 | ||
2182 | config ARCH_ENABLE_MEMORY_HOTPLUG | |
2183 | def_bool y | |
2184 | depends on X86_64 || (X86_32 && HIGHMEM) | |
2185 | ||
35551053 GH |
2186 | config ARCH_ENABLE_MEMORY_HOTREMOVE |
2187 | def_bool y | |
2188 | depends on MEMORY_HOTPLUG | |
2189 | ||
e534c7c5 | 2190 | config USE_PERCPU_NUMA_NODE_ID |
645a7919 | 2191 | def_bool y |
e534c7c5 LS |
2192 | depends on NUMA |
2193 | ||
9491846f KS |
2194 | config ARCH_ENABLE_SPLIT_PMD_PTLOCK |
2195 | def_bool y | |
2196 | depends on X86_64 || X86_PAE | |
2197 | ||
c177c81e NH |
2198 | config ARCH_ENABLE_HUGEPAGE_MIGRATION |
2199 | def_bool y | |
2200 | depends on X86_64 && HUGETLB_PAGE && MIGRATION | |
2201 | ||
da85f865 | 2202 | menu "Power management and ACPI options" |
e279b6c1 SR |
2203 | |
2204 | config ARCH_HIBERNATION_HEADER | |
3c2362e6 | 2205 | def_bool y |
e279b6c1 | 2206 | depends on X86_64 && HIBERNATION |
e279b6c1 SR |
2207 | |
2208 | source "kernel/power/Kconfig" | |
2209 | ||
2210 | source "drivers/acpi/Kconfig" | |
2211 | ||
efafc8b2 FT |
2212 | source "drivers/sfi/Kconfig" |
2213 | ||
a6b68076 | 2214 | config X86_APM_BOOT |
6fc108a0 | 2215 | def_bool y |
282e5aab | 2216 | depends on APM |
a6b68076 | 2217 | |
e279b6c1 SR |
2218 | menuconfig APM |
2219 | tristate "APM (Advanced Power Management) BIOS support" | |
efefa6f6 | 2220 | depends on X86_32 && PM_SLEEP |
e279b6c1 SR |
2221 | ---help--- |
2222 | APM is a BIOS specification for saving power using several different | |
2223 | techniques. This is mostly useful for battery powered laptops with | |
2224 | APM compliant BIOSes. If you say Y here, the system time will be | |
2225 | reset after a RESUME operation, the /proc/apm device will provide | |
2226 | battery status information, and user-space programs will receive | |
2227 | notification of APM "events" (e.g. battery status change). | |
2228 | ||
2229 | If you select "Y" here, you can disable actual use of the APM | |
2230 | BIOS by passing the "apm=off" option to the kernel at boot time. | |
2231 | ||
2232 | Note that the APM support is almost completely disabled for | |
2233 | machines with more than one CPU. | |
2234 | ||
2235 | In order to use APM, you will need supporting software. For location | |
2dc98fd3 MW |
2236 | and more information, read <file:Documentation/power/apm-acpi.txt> |
2237 | and the Battery Powered Linux mini-HOWTO, available from | |
e279b6c1 SR |
2238 | <http://www.tldp.org/docs.html#howto>. |
2239 | ||
2240 | This driver does not spin down disk drives (see the hdparm(8) | |
2241 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
2242 | VESA-compliant "green" monitors. | |
2243 | ||
2244 | This driver does not support the TI 4000M TravelMate and the ACER | |
2245 | 486/DX4/75 because they don't have compliant BIOSes. Many "green" | |
2246 | desktop machines also don't have compliant BIOSes, and this driver | |
2247 | may cause those machines to panic during the boot phase. | |
2248 | ||
2249 | Generally, if you don't have a battery in your machine, there isn't | |
2250 | much point in using this driver and you should say N. If you get | |
2251 | random kernel OOPSes or reboots that don't seem to be related to | |
2252 | anything, try disabling/enabling this option (or disabling/enabling | |
2253 | APM in your BIOS). | |
2254 | ||
2255 | Some other things you should try when experiencing seemingly random, | |
2256 | "weird" problems: | |
2257 | ||
2258 | 1) make sure that you have enough swap space and that it is | |
2259 | enabled. | |
2260 | 2) pass the "no-hlt" option to the kernel | |
2261 | 3) switch on floating point emulation in the kernel and pass | |
2262 | the "no387" option to the kernel | |
2263 | 4) pass the "floppy=nodma" option to the kernel | |
2264 | 5) pass the "mem=4M" option to the kernel (thereby disabling | |
2265 | all but the first 4 MB of RAM) | |
2266 | 6) make sure that the CPU is not over clocked. | |
2267 | 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> | |
2268 | 8) disable the cache from your BIOS settings | |
2269 | 9) install a fan for the video card or exchange video RAM | |
2270 | 10) install a better fan for the CPU | |
2271 | 11) exchange RAM chips | |
2272 | 12) exchange the motherboard. | |
2273 | ||
2274 | To compile this driver as a module, choose M here: the | |
2275 | module will be called apm. | |
2276 | ||
2277 | if APM | |
2278 | ||
2279 | config APM_IGNORE_USER_SUSPEND | |
2280 | bool "Ignore USER SUSPEND" | |
8f9ca475 | 2281 | ---help--- |
e279b6c1 SR |
2282 | This option will ignore USER SUSPEND requests. On machines with a |
2283 | compliant APM BIOS, you want to say N. However, on the NEC Versa M | |
2284 | series notebooks, it is necessary to say Y because of a BIOS bug. | |
2285 | ||
2286 | config APM_DO_ENABLE | |
2287 | bool "Enable PM at boot time" | |
2288 | ---help--- | |
2289 | Enable APM features at boot time. From page 36 of the APM BIOS | |
2290 | specification: "When disabled, the APM BIOS does not automatically | |
2291 | power manage devices, enter the Standby State, enter the Suspend | |
2292 | State, or take power saving steps in response to CPU Idle calls." | |
2293 | This driver will make CPU Idle calls when Linux is idle (unless this | |
2294 | feature is turned off -- see "Do CPU IDLE calls", below). This | |
2295 | should always save battery power, but more complicated APM features | |
2296 | will be dependent on your BIOS implementation. You may need to turn | |
2297 | this option off if your computer hangs at boot time when using APM | |
2298 | support, or if it beeps continuously instead of suspending. Turn | |
2299 | this off if you have a NEC UltraLite Versa 33/C or a Toshiba | |
2300 | T400CDT. This is off by default since most machines do fine without | |
2301 | this feature. | |
2302 | ||
2303 | config APM_CPU_IDLE | |
dd8af076 | 2304 | depends on CPU_IDLE |
e279b6c1 | 2305 | bool "Make CPU Idle calls when idle" |
8f9ca475 | 2306 | ---help--- |
e279b6c1 SR |
2307 | Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. |
2308 | On some machines, this can activate improved power savings, such as | |
2309 | a slowed CPU clock rate, when the machine is idle. These idle calls | |
2310 | are made after the idle loop has run for some length of time (e.g., | |
2311 | 333 mS). On some machines, this will cause a hang at boot time or | |
2312 | whenever the CPU becomes idle. (On machines with more than one CPU, | |
2313 | this option does nothing.) | |
2314 | ||
2315 | config APM_DISPLAY_BLANK | |
2316 | bool "Enable console blanking using APM" | |
8f9ca475 | 2317 | ---help--- |
e279b6c1 SR |
2318 | Enable console blanking using the APM. Some laptops can use this to |
2319 | turn off the LCD backlight when the screen blanker of the Linux | |
2320 | virtual console blanks the screen. Note that this is only used by | |
2321 | the virtual console screen blanker, and won't turn off the backlight | |
2322 | when using the X Window system. This also doesn't have anything to | |
2323 | do with your VESA-compliant power-saving monitor. Further, this | |
2324 | option doesn't work for all laptops -- it might not turn off your | |
2325 | backlight at all, or it might print a lot of errors to the console, | |
2326 | especially if you are using gpm. | |
2327 | ||
2328 | config APM_ALLOW_INTS | |
2329 | bool "Allow interrupts during APM BIOS calls" | |
8f9ca475 | 2330 | ---help--- |
e279b6c1 SR |
2331 | Normally we disable external interrupts while we are making calls to |
2332 | the APM BIOS as a measure to lessen the effects of a badly behaving | |
2333 | BIOS implementation. The BIOS should reenable interrupts if it | |
2334 | needs to. Unfortunately, some BIOSes do not -- especially those in | |
2335 | many of the newer IBM Thinkpads. If you experience hangs when you | |
2336 | suspend, try setting this to Y. Otherwise, say N. | |
2337 | ||
e279b6c1 SR |
2338 | endif # APM |
2339 | ||
bb0a56ec | 2340 | source "drivers/cpufreq/Kconfig" |
e279b6c1 SR |
2341 | |
2342 | source "drivers/cpuidle/Kconfig" | |
2343 | ||
27471fdb AH |
2344 | source "drivers/idle/Kconfig" |
2345 | ||
e279b6c1 SR |
2346 | endmenu |
2347 | ||
2348 | ||
2349 | menu "Bus options (PCI etc.)" | |
2350 | ||
2351 | config PCI | |
1ac97018 | 2352 | bool "PCI support" |
1c858087 | 2353 | default y |
8f9ca475 | 2354 | ---help--- |
e279b6c1 SR |
2355 | Find out whether you have a PCI motherboard. PCI is the name of a |
2356 | bus system, i.e. the way the CPU talks to the other stuff inside | |
2357 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | |
2358 | VESA. If you have PCI, say Y, otherwise N. | |
2359 | ||
e279b6c1 SR |
2360 | choice |
2361 | prompt "PCI access mode" | |
efefa6f6 | 2362 | depends on X86_32 && PCI |
e279b6c1 SR |
2363 | default PCI_GOANY |
2364 | ---help--- | |
2365 | On PCI systems, the BIOS can be used to detect the PCI devices and | |
2366 | determine their configuration. However, some old PCI motherboards | |
2367 | have BIOS bugs and may crash if this is done. Also, some embedded | |
2368 | PCI-based systems don't have any BIOS at all. Linux can also try to | |
2369 | detect the PCI hardware directly without using the BIOS. | |
2370 | ||
2371 | With this option, you can specify how Linux should detect the | |
2372 | PCI devices. If you choose "BIOS", the BIOS will be used, | |
2373 | if you choose "Direct", the BIOS won't be used, and if you | |
2374 | choose "MMConfig", then PCI Express MMCONFIG will be used. | |
2375 | If you choose "Any", the kernel will try MMCONFIG, then the | |
2376 | direct access method and falls back to the BIOS if that doesn't | |
2377 | work. If unsure, go with the default, which is "Any". | |
2378 | ||
2379 | config PCI_GOBIOS | |
2380 | bool "BIOS" | |
2381 | ||
2382 | config PCI_GOMMCONFIG | |
2383 | bool "MMConfig" | |
2384 | ||
2385 | config PCI_GODIRECT | |
2386 | bool "Direct" | |
2387 | ||
3ef0e1f8 | 2388 | config PCI_GOOLPC |
76fb6570 | 2389 | bool "OLPC XO-1" |
3ef0e1f8 AS |
2390 | depends on OLPC |
2391 | ||
2bdd1b03 AS |
2392 | config PCI_GOANY |
2393 | bool "Any" | |
2394 | ||
e279b6c1 SR |
2395 | endchoice |
2396 | ||
2397 | config PCI_BIOS | |
3c2362e6 | 2398 | def_bool y |
efefa6f6 | 2399 | depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY) |
e279b6c1 SR |
2400 | |
2401 | # x86-64 doesn't support PCI BIOS access from long mode so always go direct. | |
2402 | config PCI_DIRECT | |
3c2362e6 | 2403 | def_bool y |
0aba496f | 2404 | depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG)) |
e279b6c1 SR |
2405 | |
2406 | config PCI_MMCONFIG | |
3c2362e6 | 2407 | def_bool y |
5f0db7a2 | 2408 | depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY) |
e279b6c1 | 2409 | |
3ef0e1f8 | 2410 | config PCI_OLPC |
2bdd1b03 AS |
2411 | def_bool y |
2412 | depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY) | |
3ef0e1f8 | 2413 | |
b5401a96 AN |
2414 | config PCI_XEN |
2415 | def_bool y | |
2416 | depends on PCI && XEN | |
2417 | select SWIOTLB_XEN | |
2418 | ||
e279b6c1 | 2419 | config PCI_DOMAINS |
3c2362e6 | 2420 | def_bool y |
e279b6c1 | 2421 | depends on PCI |
e279b6c1 SR |
2422 | |
2423 | config PCI_MMCONFIG | |
2424 | bool "Support mmconfig PCI config space access" | |
2425 | depends on X86_64 && PCI && ACPI | |
2426 | ||
3f6ea84a | 2427 | config PCI_CNB20LE_QUIRK |
6a108a14 | 2428 | bool "Read CNB20LE Host Bridge Windows" if EXPERT |
6ea30386 | 2429 | depends on PCI |
3f6ea84a IS |
2430 | help |
2431 | Read the PCI windows out of the CNB20LE host bridge. This allows | |
2432 | PCI hotplug to work on systems with the CNB20LE chipset which do | |
2433 | not have ACPI. | |
2434 | ||
64a5fed6 BH |
2435 | There's no public spec for this chipset, and this functionality |
2436 | is known to be incomplete. | |
2437 | ||
2438 | You should say N unless you know you need this. | |
2439 | ||
e279b6c1 SR |
2440 | source "drivers/pci/Kconfig" |
2441 | ||
1c00f016 | 2442 | # x86_64 have no ISA slots, but can have ISA-style DMA. |
e279b6c1 | 2443 | config ISA_DMA_API |
1c00f016 DR |
2444 | bool "ISA-style DMA support" if (X86_64 && EXPERT) |
2445 | default y | |
2446 | help | |
2447 | Enables ISA-style DMA support for devices requiring such controllers. | |
2448 | If unsure, say Y. | |
e279b6c1 SR |
2449 | |
2450 | if X86_32 | |
2451 | ||
2452 | config ISA | |
2453 | bool "ISA support" | |
8f9ca475 | 2454 | ---help--- |
e279b6c1 SR |
2455 | Find out whether you have ISA slots on your motherboard. ISA is the |
2456 | name of a bus system, i.e. the way the CPU talks to the other stuff | |
2457 | inside your box. Other bus systems are PCI, EISA, MicroChannel | |
2458 | (MCA) or VESA. ISA is an older system, now being displaced by PCI; | |
2459 | newer boards don't support it. If you have ISA, say Y, otherwise N. | |
2460 | ||
2461 | config EISA | |
2462 | bool "EISA support" | |
2463 | depends on ISA | |
2464 | ---help--- | |
2465 | The Extended Industry Standard Architecture (EISA) bus was | |
2466 | developed as an open alternative to the IBM MicroChannel bus. | |
2467 | ||
2468 | The EISA bus provided some of the features of the IBM MicroChannel | |
2469 | bus while maintaining backward compatibility with cards made for | |
2470 | the older ISA bus. The EISA bus saw limited use between 1988 and | |
2471 | 1995 when it was made obsolete by the PCI bus. | |
2472 | ||
2473 | Say Y here if you are building a kernel for an EISA-based machine. | |
2474 | ||
2475 | Otherwise, say N. | |
2476 | ||
2477 | source "drivers/eisa/Kconfig" | |
2478 | ||
e279b6c1 SR |
2479 | config SCx200 |
2480 | tristate "NatSemi SCx200 support" | |
8f9ca475 | 2481 | ---help--- |
e279b6c1 SR |
2482 | This provides basic support for National Semiconductor's |
2483 | (now AMD's) Geode processors. The driver probes for the | |
2484 | PCI-IDs of several on-chip devices, so its a good dependency | |
2485 | for other scx200_* drivers. | |
2486 | ||
2487 | If compiled as a module, the driver is named scx200. | |
2488 | ||
2489 | config SCx200HR_TIMER | |
2490 | tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" | |
592913ec | 2491 | depends on SCx200 |
e279b6c1 | 2492 | default y |
8f9ca475 | 2493 | ---help--- |
e279b6c1 SR |
2494 | This driver provides a clocksource built upon the on-chip |
2495 | 27MHz high-resolution timer. Its also a workaround for | |
2496 | NSC Geode SC-1100's buggy TSC, which loses time when the | |
2497 | processor goes idle (as is done by the scheduler). The | |
2498 | other workaround is idle=poll boot option. | |
2499 | ||
3ef0e1f8 AS |
2500 | config OLPC |
2501 | bool "One Laptop Per Child support" | |
54008979 | 2502 | depends on !X86_PAE |
3c554946 | 2503 | select GPIOLIB |
dc3119e7 | 2504 | select OF |
45bb1674 | 2505 | select OF_PROMTREE |
b4e51854 | 2506 | select IRQ_DOMAIN |
8f9ca475 | 2507 | ---help--- |
3ef0e1f8 AS |
2508 | Add support for detecting the unique features of the OLPC |
2509 | XO hardware. | |
2510 | ||
a3128588 DD |
2511 | config OLPC_XO1_PM |
2512 | bool "OLPC XO-1 Power Management" | |
97c4cb71 | 2513 | depends on OLPC && MFD_CS5535 && PM_SLEEP |
a3128588 | 2514 | select MFD_CORE |
bf1ebf00 | 2515 | ---help--- |
97c4cb71 | 2516 | Add support for poweroff and suspend of the OLPC XO-1 laptop. |
bf1ebf00 | 2517 | |
cfee9597 DD |
2518 | config OLPC_XO1_RTC |
2519 | bool "OLPC XO-1 Real Time Clock" | |
2520 | depends on OLPC_XO1_PM && RTC_DRV_CMOS | |
2521 | ---help--- | |
2522 | Add support for the XO-1 real time clock, which can be used as a | |
2523 | programmable wakeup source. | |
2524 | ||
7feda8e9 DD |
2525 | config OLPC_XO1_SCI |
2526 | bool "OLPC XO-1 SCI extras" | |
d8d01a63 | 2527 | depends on OLPC && OLPC_XO1_PM |
ed8e47fe | 2528 | depends on INPUT=y |
d8d01a63 | 2529 | select POWER_SUPPLY |
7feda8e9 DD |
2530 | select GPIO_CS5535 |
2531 | select MFD_CORE | |
2532 | ---help--- | |
2533 | Add support for SCI-based features of the OLPC XO-1 laptop: | |
7bc74b3d | 2534 | - EC-driven system wakeups |
7feda8e9 | 2535 | - Power button |
7bc74b3d | 2536 | - Ebook switch |
2cf2baea | 2537 | - Lid switch |
e1040ac6 DD |
2538 | - AC adapter status updates |
2539 | - Battery status updates | |
7feda8e9 | 2540 | |
a0f30f59 DD |
2541 | config OLPC_XO15_SCI |
2542 | bool "OLPC XO-1.5 SCI extras" | |
d8d01a63 DD |
2543 | depends on OLPC && ACPI |
2544 | select POWER_SUPPLY | |
a0f30f59 DD |
2545 | ---help--- |
2546 | Add support for SCI-based features of the OLPC XO-1.5 laptop: | |
2547 | - EC-driven system wakeups | |
2548 | - AC adapter status updates | |
2549 | - Battery status updates | |
bf1ebf00 | 2550 | |
d4f3e350 EW |
2551 | config ALIX |
2552 | bool "PCEngines ALIX System Support (LED setup)" | |
2553 | select GPIOLIB | |
2554 | ---help--- | |
2555 | This option enables system support for the PCEngines ALIX. | |
2556 | At present this just sets up LEDs for GPIO control on | |
2557 | ALIX2/3/6 boards. However, other system specific setup should | |
2558 | get added here. | |
2559 | ||
2560 | Note: You must still enable the drivers for GPIO and LED support | |
2561 | (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs | |
2562 | ||
2563 | Note: You have to set alix.force=1 for boards with Award BIOS. | |
2564 | ||
da4e3302 PP |
2565 | config NET5501 |
2566 | bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)" | |
2567 | select GPIOLIB | |
2568 | ---help--- | |
2569 | This option enables system support for the Soekris Engineering net5501. | |
2570 | ||
3197059a PP |
2571 | config GEOS |
2572 | bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)" | |
2573 | select GPIOLIB | |
2574 | depends on DMI | |
2575 | ---help--- | |
2576 | This option enables system support for the Traverse Technologies GEOS. | |
2577 | ||
7d029125 VD |
2578 | config TS5500 |
2579 | bool "Technologic Systems TS-5500 platform support" | |
2580 | depends on MELAN | |
2581 | select CHECK_SIGNATURE | |
2582 | select NEW_LEDS | |
2583 | select LEDS_CLASS | |
2584 | ---help--- | |
2585 | This option enables system support for the Technologic Systems TS-5500. | |
2586 | ||
bc0120fd SR |
2587 | endif # X86_32 |
2588 | ||
23ac4ae8 | 2589 | config AMD_NB |
e279b6c1 | 2590 | def_bool y |
0e152cd7 | 2591 | depends on CPU_SUP_AMD && PCI |
e279b6c1 SR |
2592 | |
2593 | source "drivers/pcmcia/Kconfig" | |
2594 | ||
388b78ad | 2595 | config RAPIDIO |
fdf90abc | 2596 | tristate "RapidIO support" |
388b78ad AB |
2597 | depends on PCI |
2598 | default n | |
2599 | help | |
fdf90abc | 2600 | If enabled this option will include drivers and the core |
388b78ad AB |
2601 | infrastructure code to support RapidIO interconnect devices. |
2602 | ||
2603 | source "drivers/rapidio/Kconfig" | |
2604 | ||
e3263ab3 DH |
2605 | config X86_SYSFB |
2606 | bool "Mark VGA/VBE/EFI FB as generic system framebuffer" | |
2607 | help | |
2608 | Firmwares often provide initial graphics framebuffers so the BIOS, | |
2609 | bootloader or kernel can show basic video-output during boot for | |
2610 | user-guidance and debugging. Historically, x86 used the VESA BIOS | |
2611 | Extensions and EFI-framebuffers for this, which are mostly limited | |
2612 | to x86. | |
2613 | This option, if enabled, marks VGA/VBE/EFI framebuffers as generic | |
2614 | framebuffers so the new generic system-framebuffer drivers can be | |
2615 | used on x86. If the framebuffer is not compatible with the generic | |
2616 | modes, it is adverticed as fallback platform framebuffer so legacy | |
2617 | drivers like efifb, vesafb and uvesafb can pick it up. | |
2618 | If this option is not selected, all system framebuffers are always | |
2619 | marked as fallback platform framebuffers as usual. | |
2620 | ||
2621 | Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will | |
2622 | not be able to pick up generic system framebuffers if this option | |
2623 | is selected. You are highly encouraged to enable simplefb as | |
2624 | replacement if you select this option. simplefb can correctly deal | |
2625 | with generic system framebuffers. But you should still keep vesafb | |
2626 | and others enabled as fallback if a system framebuffer is | |
2627 | incompatible with simplefb. | |
2628 | ||
2629 | If unsure, say Y. | |
2630 | ||
e279b6c1 SR |
2631 | endmenu |
2632 | ||
2633 | ||
2634 | menu "Executable file formats / Emulations" | |
2635 | ||
2636 | source "fs/Kconfig.binfmt" | |
2637 | ||
2638 | config IA32_EMULATION | |
2639 | bool "IA32 Emulation" | |
2640 | depends on X86_64 | |
d1603990 | 2641 | select BINFMT_ELF |
a97f52e6 | 2642 | select COMPAT_BINFMT_ELF |
3bead553 | 2643 | select ARCH_WANT_OLD_COMPAT_IPC |
8f9ca475 | 2644 | ---help--- |
5fd92e65 L |
2645 | Include code to run legacy 32-bit programs under a |
2646 | 64-bit kernel. You should likely turn this on, unless you're | |
2647 | 100% sure that you don't have any 32-bit programs left. | |
e279b6c1 SR |
2648 | |
2649 | config IA32_AOUT | |
8f9ca475 IM |
2650 | tristate "IA32 a.out support" |
2651 | depends on IA32_EMULATION | |
2652 | ---help--- | |
2653 | Support old a.out binaries in the 32bit emulation. | |
e279b6c1 | 2654 | |
0bf62763 | 2655 | config X86_X32 |
6ea30386 | 2656 | bool "x32 ABI for 64-bit mode" |
9b54050b | 2657 | depends on X86_64 |
5fd92e65 L |
2658 | ---help--- |
2659 | Include code to run binaries for the x32 native 32-bit ABI | |
2660 | for 64-bit processors. An x32 process gets access to the | |
2661 | full 64-bit register file and wide data path while leaving | |
2662 | pointers at 32 bits for smaller memory footprint. | |
2663 | ||
2664 | You will need a recent binutils (2.22 or later) with | |
2665 | elf32_x86_64 support enabled to compile a kernel with this | |
2666 | option set. | |
2667 | ||
e279b6c1 | 2668 | config COMPAT |
3c2362e6 | 2669 | def_bool y |
0bf62763 | 2670 | depends on IA32_EMULATION || X86_X32 |
e279b6c1 | 2671 | |
3120e25e | 2672 | if COMPAT |
e279b6c1 | 2673 | config COMPAT_FOR_U64_ALIGNMENT |
3120e25e | 2674 | def_bool y |
e279b6c1 SR |
2675 | |
2676 | config SYSVIPC_COMPAT | |
3c2362e6 | 2677 | def_bool y |
3120e25e | 2678 | depends on SYSVIPC |
e279b6c1 | 2679 | |
ee009e4a | 2680 | config KEYS_COMPAT |
3120e25e JB |
2681 | def_bool y |
2682 | depends on KEYS | |
2683 | endif | |
ee009e4a | 2684 | |
e279b6c1 SR |
2685 | endmenu |
2686 | ||
2687 | ||
e5beae16 KP |
2688 | config HAVE_ATOMIC_IOMAP |
2689 | def_bool y | |
2690 | depends on X86_32 | |
2691 | ||
4692d77f AR |
2692 | config X86_DEV_DMA_OPS |
2693 | bool | |
83125a3a | 2694 | depends on X86_64 || STA2X11 |
4692d77f | 2695 | |
f7219a53 AR |
2696 | config X86_DMA_REMAP |
2697 | bool | |
83125a3a | 2698 | depends on STA2X11 |
f7219a53 | 2699 | |
93e5eadd LA |
2700 | config PMC_ATOM |
2701 | def_bool y | |
2702 | depends on PCI | |
2703 | ||
185a383a KB |
2704 | config VMD |
2705 | depends on PCI_MSI | |
2706 | tristate "Volume Management Device Driver" | |
2707 | default N | |
2708 | ---help--- | |
2709 | Adds support for the Intel Volume Management Device (VMD). VMD is a | |
2710 | secondary PCI host bridge that allows PCI Express root ports, | |
2711 | and devices attached to them, to be removed from the default | |
2712 | PCI domain and placed within the VMD domain. This provides | |
2713 | more bus resources than are otherwise possible with a | |
2714 | single domain. If you know your system provides one of these and | |
2715 | has devices attached to it, say Y; if you are not sure, say N. | |
2716 | ||
e279b6c1 SR |
2717 | source "net/Kconfig" |
2718 | ||
2719 | source "drivers/Kconfig" | |
2720 | ||
2721 | source "drivers/firmware/Kconfig" | |
2722 | ||
2723 | source "fs/Kconfig" | |
2724 | ||
e279b6c1 SR |
2725 | source "arch/x86/Kconfig.debug" |
2726 | ||
2727 | source "security/Kconfig" | |
2728 | ||
2729 | source "crypto/Kconfig" | |
2730 | ||
edf88417 AK |
2731 | source "arch/x86/kvm/Kconfig" |
2732 | ||
e279b6c1 | 2733 | source "lib/Kconfig" |