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 |
96601adb | 31 | select ARCH_HAS_PMEM_API if X86_64 |
67a3e8fe | 32 | select ARCH_HAS_MMIO_FLUSH |
6471b825 | 33 | select ARCH_HAS_SG_CHAIN |
c6d30853 | 34 | select ARCH_HAS_UBSAN_SANITIZE_ALL |
6471b825 IM |
35 | select ARCH_HAVE_NMI_SAFE_CMPXCHG |
36 | select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI | |
77fbbc81 | 37 | select ARCH_MIGHT_HAVE_PC_PARPORT |
5e2c18c0 | 38 | select ARCH_MIGHT_HAVE_PC_SERIO |
6471b825 | 39 | select ARCH_SUPPORTS_ATOMIC_RMW |
3b242c66 | 40 | select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT |
6471b825 IM |
41 | select ARCH_SUPPORTS_INT128 if X86_64 |
42 | select ARCH_SUPPORTS_NUMA_BALANCING if X86_64 | |
43 | select ARCH_USE_BUILTIN_BSWAP | |
44 | select ARCH_USE_CMPXCHG_LOCKREF if X86_64 | |
45 | select ARCH_USE_QUEUED_RWLOCKS | |
46 | select ARCH_USE_QUEUED_SPINLOCKS | |
72b252ae | 47 | select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH if SMP |
5aaeb5c0 | 48 | select ARCH_WANTS_DYNAMIC_TASK_STRUCT |
da4276b8 | 49 | select ARCH_WANT_FRAME_POINTERS |
6471b825 IM |
50 | select ARCH_WANT_IPC_PARSE_VERSION if X86_32 |
51 | select ARCH_WANT_OPTIONAL_GPIOLIB | |
52 | select BUILDTIME_EXTABLE_SORT | |
53 | select CLKEVT_I8253 | |
54 | select CLKSRC_I8253 if X86_32 | |
55 | select CLOCKSOURCE_VALIDATE_LAST_CYCLE | |
56 | select CLOCKSOURCE_WATCHDOG | |
57 | select CLONE_BACKWARDS if X86_32 | |
58 | select COMPAT_OLD_SIGACTION if IA32_EMULATION | |
59 | select DCACHE_WORD_ACCESS | |
45471cd9 LT |
60 | select EDAC_ATOMIC_SCRUB |
61 | select EDAC_SUPPORT | |
6471b825 IM |
62 | select GENERIC_CLOCKEVENTS |
63 | select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) | |
64 | select GENERIC_CLOCKEVENTS_MIN_ADJUST | |
65 | select GENERIC_CMOS_UPDATE | |
66 | select GENERIC_CPU_AUTOPROBE | |
5b7c73e0 | 67 | select GENERIC_EARLY_IOREMAP |
6471b825 IM |
68 | select GENERIC_FIND_FIRST_BIT |
69 | select GENERIC_IOMAP | |
70 | select GENERIC_IRQ_PROBE | |
71 | select GENERIC_IRQ_SHOW | |
72 | select GENERIC_PENDING_IRQ if SMP | |
73 | select GENERIC_SMP_IDLE_THREAD | |
74 | select GENERIC_STRNCPY_FROM_USER | |
75 | select GENERIC_STRNLEN_USER | |
76 | select GENERIC_TIME_VSYSCALL | |
77 | select HAVE_ACPI_APEI if ACPI | |
78 | select HAVE_ACPI_APEI_NMI if ACPI | |
79 | select HAVE_ALIGNED_STRUCT_PAGE if SLUB | |
80 | select HAVE_AOUT if X86_32 | |
81 | select HAVE_ARCH_AUDITSYSCALL | |
82 | select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE | |
83 | select HAVE_ARCH_JUMP_LABEL | |
84 | select HAVE_ARCH_KASAN if X86_64 && SPARSEMEM_VMEMMAP | |
85 | select HAVE_ARCH_KGDB | |
86 | select HAVE_ARCH_KMEMCHECK | |
9e08f57d DC |
87 | select HAVE_ARCH_MMAP_RND_BITS if MMU |
88 | select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT | |
6471b825 IM |
89 | select HAVE_ARCH_SECCOMP_FILTER |
90 | select HAVE_ARCH_SOFT_DIRTY if X86_64 | |
91 | select HAVE_ARCH_TRACEHOOK | |
92 | select HAVE_ARCH_TRANSPARENT_HUGEPAGE | |
93 | select HAVE_BPF_JIT if X86_64 | |
94 | select HAVE_CC_STACKPROTECTOR | |
95 | select HAVE_CMPXCHG_DOUBLE | |
96 | select HAVE_CMPXCHG_LOCAL | |
97 | select HAVE_CONTEXT_TRACKING if X86_64 | |
c1bd55f9 | 98 | select HAVE_COPY_THREAD_TLS |
cf4db259 | 99 | select HAVE_C_RECORDMCOUNT |
6471b825 IM |
100 | select HAVE_DEBUG_KMEMLEAK |
101 | select HAVE_DEBUG_STACKOVERFLOW | |
102 | select HAVE_DMA_API_DEBUG | |
6471b825 | 103 | select HAVE_DMA_CONTIGUOUS |
677aa9f7 | 104 | select HAVE_DYNAMIC_FTRACE |
06aeaaea | 105 | select HAVE_DYNAMIC_FTRACE_WITH_REGS |
58340a07 | 106 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
6471b825 IM |
107 | select HAVE_FENTRY if X86_64 |
108 | select HAVE_FTRACE_MCOUNT_RECORD | |
109 | select HAVE_FUNCTION_GRAPH_FP_TEST | |
110 | select HAVE_FUNCTION_GRAPH_TRACER | |
111 | select HAVE_FUNCTION_TRACER | |
112 | select HAVE_GENERIC_DMA_COHERENT if X86_32 | |
113 | select HAVE_HW_BREAKPOINT | |
114 | select HAVE_IDE | |
115 | select HAVE_IOREMAP_PROT | |
116 | select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64 | |
117 | select HAVE_IRQ_TIME_ACCOUNTING | |
2e9f3bdd | 118 | select HAVE_KERNEL_BZIP2 |
6471b825 IM |
119 | select HAVE_KERNEL_GZIP |
120 | select HAVE_KERNEL_LZ4 | |
2e9f3bdd | 121 | select HAVE_KERNEL_LZMA |
13510997 | 122 | select HAVE_KERNEL_LZO |
6471b825 IM |
123 | select HAVE_KERNEL_XZ |
124 | select HAVE_KPROBES | |
125 | select HAVE_KPROBES_ON_FTRACE | |
126 | select HAVE_KRETPROBES | |
127 | select HAVE_KVM | |
128 | select HAVE_LIVEPATCH if X86_64 | |
129 | select HAVE_MEMBLOCK | |
130 | select HAVE_MEMBLOCK_NODE_MAP | |
0102752e | 131 | select HAVE_MIXED_BREAKPOINTS_REGS |
6471b825 IM |
132 | select HAVE_OPROFILE |
133 | select HAVE_OPTPROBES | |
134 | select HAVE_PCSPKR_PLATFORM | |
135 | select HAVE_PERF_EVENTS | |
c01d4323 | 136 | select HAVE_PERF_EVENTS_NMI |
c5e63197 | 137 | select HAVE_PERF_REGS |
c5ebcedb | 138 | select HAVE_PERF_USER_STACK_DUMP |
6471b825 IM |
139 | select HAVE_REGS_AND_STACK_ACCESS_API |
140 | select HAVE_SYSCALL_TRACEPOINTS | |
0c3619ea | 141 | select HAVE_UID16 if X86_32 || IA32_EMULATION |
6471b825 | 142 | select HAVE_UNSTABLE_SCHED_CLOCK |
7c68af6e | 143 | select HAVE_USER_RETURN_NOTIFIER |
c0185808 | 144 | select IRQ_FORCED_THREADING |
6471b825 IM |
145 | select MODULES_USE_ELF_RELA if X86_64 |
146 | select MODULES_USE_ELF_REL if X86_32 | |
147 | select OLD_SIGACTION if X86_32 | |
148 | select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION | |
149 | select PERF_EVENTS | |
3195ef59 | 150 | select RTC_LIB |
6471b825 | 151 | select SPARSE_IRQ |
83fe27ea | 152 | select SRCU |
6471b825 IM |
153 | select SYSCTL_EXCEPTION_TRACE |
154 | select USER_STACKTRACE_SUPPORT | |
155 | select VIRT_TO_BUS | |
156 | select X86_DEV_DMA_OPS if X86_64 | |
157 | select X86_FEATURE_NAMES if PROC_FS | |
63c17fb8 | 158 | select ARCH_USES_HIGH_VMA_FLAGS if X86_INTEL_MEMORY_PROTECTION_KEYS |
7d8330a5 | 159 | |
ba7e4d13 | 160 | config INSTRUCTION_DECODER |
3120e25e JB |
161 | def_bool y |
162 | depends on KPROBES || PERF_EVENTS || UPROBES | |
ba7e4d13 | 163 | |
7fb0f1de PZ |
164 | config PERF_EVENTS_INTEL_UNCORE |
165 | def_bool y | |
ce5686d4 | 166 | depends on PERF_EVENTS && CPU_SUP_INTEL && PCI |
7fb0f1de | 167 | |
51b26ada LT |
168 | config OUTPUT_FORMAT |
169 | string | |
170 | default "elf32-i386" if X86_32 | |
171 | default "elf64-x86-64" if X86_64 | |
172 | ||
73531905 | 173 | config ARCH_DEFCONFIG |
b9b39bfb | 174 | string |
73531905 SR |
175 | default "arch/x86/configs/i386_defconfig" if X86_32 |
176 | default "arch/x86/configs/x86_64_defconfig" if X86_64 | |
b9b39bfb | 177 | |
8d5fffb9 | 178 | config LOCKDEP_SUPPORT |
3c2362e6 | 179 | def_bool y |
8d5fffb9 SR |
180 | |
181 | config STACKTRACE_SUPPORT | |
3c2362e6 | 182 | def_bool y |
8d5fffb9 | 183 | |
8d5fffb9 | 184 | config MMU |
3c2362e6 | 185 | def_bool y |
8d5fffb9 | 186 | |
9e08f57d DC |
187 | config ARCH_MMAP_RND_BITS_MIN |
188 | default 28 if 64BIT | |
189 | default 8 | |
190 | ||
191 | config ARCH_MMAP_RND_BITS_MAX | |
192 | default 32 if 64BIT | |
193 | default 16 | |
194 | ||
195 | config ARCH_MMAP_RND_COMPAT_BITS_MIN | |
196 | default 8 | |
197 | ||
198 | config ARCH_MMAP_RND_COMPAT_BITS_MAX | |
199 | default 16 | |
200 | ||
8d5fffb9 SR |
201 | config SBUS |
202 | bool | |
203 | ||
3bc4e459 | 204 | config NEED_DMA_MAP_STATE |
3120e25e | 205 | def_bool y |
a6dfa128 | 206 | depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG || SWIOTLB |
3bc4e459 | 207 | |
18e98307 | 208 | config NEED_SG_DMA_LENGTH |
4a14d84e | 209 | def_bool y |
18e98307 | 210 | |
8d5fffb9 | 211 | config GENERIC_ISA_DMA |
3120e25e JB |
212 | def_bool y |
213 | depends on ISA_DMA_API | |
8d5fffb9 | 214 | |
8d5fffb9 | 215 | config GENERIC_BUG |
3c2362e6 | 216 | def_bool y |
8d5fffb9 | 217 | depends on BUG |
b93a531e JB |
218 | select GENERIC_BUG_RELATIVE_POINTERS if X86_64 |
219 | ||
220 | config GENERIC_BUG_RELATIVE_POINTERS | |
221 | bool | |
8d5fffb9 SR |
222 | |
223 | config GENERIC_HWEIGHT | |
3c2362e6 | 224 | def_bool y |
8d5fffb9 SR |
225 | |
226 | config ARCH_MAY_HAVE_PC_FDC | |
3120e25e JB |
227 | def_bool y |
228 | depends on ISA_DMA_API | |
8d5fffb9 | 229 | |
1032c0ba | 230 | config RWSEM_XCHGADD_ALGORITHM |
3120e25e | 231 | def_bool y |
1032c0ba | 232 | |
1032c0ba SR |
233 | config GENERIC_CALIBRATE_DELAY |
234 | def_bool y | |
235 | ||
9a0b8415 | 236 | config ARCH_HAS_CPU_RELAX |
237 | def_bool y | |
238 | ||
1b27d05b PE |
239 | config ARCH_HAS_CACHE_LINE_SIZE |
240 | def_bool y | |
241 | ||
dd5af90a | 242 | config HAVE_SETUP_PER_CPU_AREA |
89c9c4c5 | 243 | def_bool y |
b32ef636 | 244 | |
08fc4580 TH |
245 | config NEED_PER_CPU_EMBED_FIRST_CHUNK |
246 | def_bool y | |
247 | ||
248 | config NEED_PER_CPU_PAGE_FIRST_CHUNK | |
11124411 TH |
249 | def_bool y |
250 | ||
801e4062 JB |
251 | config ARCH_HIBERNATION_POSSIBLE |
252 | def_bool y | |
801e4062 | 253 | |
f4cb5700 JB |
254 | config ARCH_SUSPEND_POSSIBLE |
255 | def_bool y | |
f4cb5700 | 256 | |
cfe28c5d SC |
257 | config ARCH_WANT_HUGE_PMD_SHARE |
258 | def_bool y | |
259 | ||
53313b2c SC |
260 | config ARCH_WANT_GENERAL_HUGETLB |
261 | def_bool y | |
262 | ||
8d5fffb9 | 263 | config ZONE_DMA32 |
e0fd24a3 | 264 | def_bool y if X86_64 |
8d5fffb9 | 265 | |
8d5fffb9 | 266 | config AUDIT_ARCH |
e0fd24a3 | 267 | def_bool y if X86_64 |
8d5fffb9 | 268 | |
765c68bd IM |
269 | config ARCH_SUPPORTS_OPTIMIZED_INLINING |
270 | def_bool y | |
271 | ||
6a11f75b AM |
272 | config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
273 | def_bool y | |
274 | ||
d6f2d75a AR |
275 | config KASAN_SHADOW_OFFSET |
276 | hex | |
277 | depends on KASAN | |
278 | default 0xdffffc0000000000 | |
279 | ||
69575d38 SW |
280 | config HAVE_INTEL_TXT |
281 | def_bool y | |
6ea30386 | 282 | depends on INTEL_IOMMU && ACPI |
69575d38 | 283 | |
6b0c3d44 SR |
284 | config X86_32_SMP |
285 | def_bool y | |
286 | depends on X86_32 && SMP | |
287 | ||
288 | config X86_64_SMP | |
289 | def_bool y | |
290 | depends on X86_64 && SMP | |
291 | ||
ccbeed3a TH |
292 | config X86_32_LAZY_GS |
293 | def_bool y | |
60a5317f | 294 | depends on X86_32 && !CC_STACKPROTECTOR |
ccbeed3a | 295 | |
d61931d8 BP |
296 | config ARCH_HWEIGHT_CFLAGS |
297 | string | |
298 | default "-fcall-saved-ecx -fcall-saved-edx" if X86_32 | |
299 | 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 | |
300 | ||
2b144498 SD |
301 | config ARCH_SUPPORTS_UPROBES |
302 | def_bool y | |
303 | ||
d20642f0 RH |
304 | config FIX_EARLYCON_MEM |
305 | def_bool y | |
306 | ||
98233368 KS |
307 | config PGTABLE_LEVELS |
308 | int | |
309 | default 4 if X86_64 | |
310 | default 3 if X86_PAE | |
311 | default 2 | |
312 | ||
506f1d07 | 313 | source "init/Kconfig" |
dc52ddc0 | 314 | source "kernel/Kconfig.freezer" |
8d5fffb9 | 315 | |
506f1d07 SR |
316 | menu "Processor type and features" |
317 | ||
5ee71535 RD |
318 | config ZONE_DMA |
319 | bool "DMA memory allocation support" if EXPERT | |
320 | default y | |
321 | help | |
322 | DMA memory allocation support allows devices with less than 32-bit | |
323 | addressing to allocate within the first 16MB of address space. | |
324 | Disable if no such devices will be used. | |
325 | ||
326 | If unsure, say Y. | |
327 | ||
506f1d07 SR |
328 | config SMP |
329 | bool "Symmetric multi-processing support" | |
330 | ---help--- | |
331 | This enables support for systems with more than one CPU. If you have | |
4a474157 RG |
332 | a system with only one CPU, say N. If you have a system with more |
333 | than one CPU, say Y. | |
506f1d07 | 334 | |
4a474157 | 335 | If you say N here, the kernel will run on uni- and multiprocessor |
506f1d07 SR |
336 | machines, but will use only one CPU of a multiprocessor machine. If |
337 | you say Y here, the kernel will run on many, but not all, | |
4a474157 | 338 | uniprocessor machines. On a uniprocessor machine, the kernel |
506f1d07 SR |
339 | will run faster if you say N here. |
340 | ||
341 | Note that if you say Y here and choose architecture "586" or | |
342 | "Pentium" under "Processor family", the kernel will not work on 486 | |
343 | architectures. Similarly, multiprocessor kernels for the "PPro" | |
344 | architecture may not work on all Pentium based boards. | |
345 | ||
346 | People using multiprocessor machines who say Y here should also say | |
347 | Y to "Enhanced Real Time Clock Support", below. The "Advanced Power | |
348 | Management" code will be disabled if you say Y here. | |
349 | ||
395cf969 | 350 | See also <file:Documentation/x86/i386/IO-APIC.txt>, |
506f1d07 SR |
351 | <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at |
352 | <http://www.tldp.org/docs.html#howto>. | |
353 | ||
354 | If you don't know what to do here, say N. | |
355 | ||
9def39be JT |
356 | config X86_FEATURE_NAMES |
357 | bool "Processor feature human-readable names" if EMBEDDED | |
358 | default y | |
359 | ---help--- | |
360 | This option compiles in a table of x86 feature bits and corresponding | |
361 | names. This is required to support /proc/cpuinfo and a few kernel | |
362 | messages. You can disable this to save space, at the expense of | |
363 | making those few kernel messages show numeric feature bits instead. | |
364 | ||
365 | If in doubt, say Y. | |
366 | ||
6e1315fe BP |
367 | config X86_FAST_FEATURE_TESTS |
368 | bool "Fast CPU feature tests" if EMBEDDED | |
369 | default y | |
370 | ---help--- | |
371 | Some fast-paths in the kernel depend on the capabilities of the CPU. | |
372 | Say Y here for the kernel to patch in the appropriate code at runtime | |
373 | based on the capabilities of the CPU. The infrastructure for patching | |
374 | code at runtime takes up some additional space; space-constrained | |
375 | embedded systems may wish to say N here to produce smaller, slightly | |
376 | slower code. | |
377 | ||
06cd9a7d YL |
378 | config X86_X2APIC |
379 | bool "Support x2apic" | |
19e3d60d | 380 | depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST) |
06cd9a7d YL |
381 | ---help--- |
382 | This enables x2apic support on CPUs that have this feature. | |
383 | ||
384 | This allows 32-bit apic IDs (so it can support very large systems), | |
385 | and accesses the local apic via MSRs not via mmio. | |
386 | ||
06cd9a7d YL |
387 | If you don't know what to do here, say N. |
388 | ||
6695c85b | 389 | config X86_MPPARSE |
6e87f9b7 | 390 | bool "Enable MPS table" if ACPI || SFI |
7a527688 | 391 | default y |
5ab74722 | 392 | depends on X86_LOCAL_APIC |
8f9ca475 | 393 | ---help--- |
6695c85b YL |
394 | For old smp systems that do not have proper acpi support. Newer systems |
395 | (esp with 64bit cpus) with acpi support, MADT and DSDT will override it | |
6695c85b | 396 | |
26f7ef14 YL |
397 | config X86_BIGSMP |
398 | bool "Support for big SMP systems with more than 8 CPUs" | |
399 | depends on X86_32 && SMP | |
8f9ca475 | 400 | ---help--- |
26f7ef14 | 401 | This option is needed for the systems that have more than 8 CPUs |
506f1d07 | 402 | |
ddd70cf9 JN |
403 | config GOLDFISH |
404 | def_bool y | |
405 | depends on X86_GOLDFISH | |
406 | ||
8425091f | 407 | if X86_32 |
c5c606d9 RT |
408 | config X86_EXTENDED_PLATFORM |
409 | bool "Support for extended (non-PC) x86 platforms" | |
410 | default y | |
8f9ca475 | 411 | ---help--- |
06ac8346 IM |
412 | If you disable this option then the kernel will only support |
413 | standard PC platforms. (which covers the vast majority of | |
414 | systems out there.) | |
415 | ||
8425091f RT |
416 | If you enable this option then you'll be able to select support |
417 | for the following (non-PC) 32 bit x86 platforms: | |
cb7b8023 | 418 | Goldfish (Android emulator) |
8425091f | 419 | AMD Elan |
8425091f RT |
420 | RDC R-321x SoC |
421 | SGI 320/540 (Visual Workstation) | |
83125a3a | 422 | STA2X11-based (e.g. Northville) |
3f4110a4 | 423 | Moorestown MID devices |
06ac8346 IM |
424 | |
425 | If you have one of these systems, or if you want to build a | |
426 | generic distribution kernel, say Y here - otherwise say N. | |
8425091f | 427 | endif |
06ac8346 | 428 | |
8425091f RT |
429 | if X86_64 |
430 | config X86_EXTENDED_PLATFORM | |
431 | bool "Support for extended (non-PC) x86 platforms" | |
432 | default y | |
433 | ---help--- | |
434 | If you disable this option then the kernel will only support | |
435 | standard PC platforms. (which covers the vast majority of | |
436 | systems out there.) | |
437 | ||
438 | If you enable this option then you'll be able to select support | |
439 | for the following (non-PC) 64 bit x86 platforms: | |
44b111b5 | 440 | Numascale NumaChip |
8425091f RT |
441 | ScaleMP vSMP |
442 | SGI Ultraviolet | |
443 | ||
444 | If you have one of these systems, or if you want to build a | |
445 | generic distribution kernel, say Y here - otherwise say N. | |
446 | endif | |
c5c606d9 RT |
447 | # This is an alphabetically sorted list of 64 bit extended platforms |
448 | # Please maintain the alphabetic order if and when there are additions | |
44b111b5 SP |
449 | config X86_NUMACHIP |
450 | bool "Numascale NumaChip" | |
451 | depends on X86_64 | |
452 | depends on X86_EXTENDED_PLATFORM | |
453 | depends on NUMA | |
454 | depends on SMP | |
455 | depends on X86_X2APIC | |
f9726bfd | 456 | depends on PCI_MMCONFIG |
44b111b5 SP |
457 | ---help--- |
458 | Adds support for Numascale NumaChip large-SMP systems. Needed to | |
459 | enable more than ~168 cores. | |
460 | If you don't have one of these, you should say N here. | |
506f1d07 | 461 | |
c5c606d9 RT |
462 | config X86_VSMP |
463 | bool "ScaleMP vSMP" | |
6276a074 | 464 | select HYPERVISOR_GUEST |
c5c606d9 RT |
465 | select PARAVIRT |
466 | depends on X86_64 && PCI | |
467 | depends on X86_EXTENDED_PLATFORM | |
ead91d4b | 468 | depends on SMP |
8f9ca475 | 469 | ---help--- |
c5c606d9 RT |
470 | Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is |
471 | supposed to run on these EM64T-based machines. Only choose this option | |
472 | if you have one of these machines. | |
5e3a77e9 | 473 | |
03b48632 NP |
474 | config X86_UV |
475 | bool "SGI Ultraviolet" | |
476 | depends on X86_64 | |
c5c606d9 | 477 | depends on X86_EXTENDED_PLATFORM |
54c28d29 | 478 | depends on NUMA |
1ecb4ae5 | 479 | depends on EFI |
9d6c26e7 | 480 | depends on X86_X2APIC |
1222e564 | 481 | depends on PCI |
8f9ca475 | 482 | ---help--- |
03b48632 NP |
483 | This option is needed in order to support SGI Ultraviolet systems. |
484 | If you don't have one of these, you should say N here. | |
485 | ||
c5c606d9 RT |
486 | # Following is an alphabetically sorted list of 32 bit extended platforms |
487 | # Please maintain the alphabetic order if and when there are additions | |
506f1d07 | 488 | |
ddd70cf9 JN |
489 | config X86_GOLDFISH |
490 | bool "Goldfish (Virtual Platform)" | |
cb7b8023 | 491 | depends on X86_EXTENDED_PLATFORM |
ddd70cf9 JN |
492 | ---help--- |
493 | Enable support for the Goldfish virtual platform used primarily | |
494 | for Android development. Unless you are building for the Android | |
495 | Goldfish emulator say N here. | |
496 | ||
c751e17b TG |
497 | config X86_INTEL_CE |
498 | bool "CE4100 TV platform" | |
499 | depends on PCI | |
500 | depends on PCI_GODIRECT | |
6084a6e2 | 501 | depends on X86_IO_APIC |
c751e17b TG |
502 | depends on X86_32 |
503 | depends on X86_EXTENDED_PLATFORM | |
37bc9f50 | 504 | select X86_REBOOTFIXUPS |
da6b737b SAS |
505 | select OF |
506 | select OF_EARLY_FLATTREE | |
c751e17b TG |
507 | ---help--- |
508 | Select for the Intel CE media processor (CE4100) SOC. | |
509 | This option compiles in support for the CE4100 SOC for settop | |
510 | boxes and media devices. | |
511 | ||
4cb9b00f | 512 | config X86_INTEL_MID |
43605ef1 | 513 | bool "Intel MID platform support" |
43605ef1 | 514 | depends on X86_EXTENDED_PLATFORM |
edc6bc78 | 515 | depends on X86_PLATFORM_DEVICES |
1ea7c673 | 516 | depends on PCI |
3fda5bb4 | 517 | depends on X86_64 || (PCI_GOANY && X86_32) |
1ea7c673 | 518 | depends on X86_IO_APIC |
7c9c3a1e | 519 | select SFI |
4cb9b00f | 520 | select I2C |
7c9c3a1e | 521 | select DW_APB_TIMER |
1ea7c673 | 522 | select APB_TIMER |
1ea7c673 | 523 | select INTEL_SCU_IPC |
15a713df | 524 | select MFD_INTEL_MSIC |
1ea7c673 | 525 | ---help--- |
4cb9b00f DC |
526 | Select to build a kernel capable of supporting Intel MID (Mobile |
527 | Internet Device) platform systems which do not have the PCI legacy | |
528 | interfaces. If you are building for a PC class system say N here. | |
1ea7c673 | 529 | |
4cb9b00f DC |
530 | Intel MID platforms are based on an Intel processor and chipset which |
531 | consume less power than most of the x86 derivatives. | |
43605ef1 | 532 | |
8bbc2a13 BD |
533 | config X86_INTEL_QUARK |
534 | bool "Intel Quark platform support" | |
535 | depends on X86_32 | |
536 | depends on X86_EXTENDED_PLATFORM | |
537 | depends on X86_PLATFORM_DEVICES | |
538 | depends on X86_TSC | |
539 | depends on PCI | |
540 | depends on PCI_GOANY | |
541 | depends on X86_IO_APIC | |
542 | select IOSF_MBI | |
543 | select INTEL_IMR | |
9ab6eb51 | 544 | select COMMON_CLK |
8bbc2a13 BD |
545 | ---help--- |
546 | Select to include support for Quark X1000 SoC. | |
547 | Say Y here if you have a Quark based system such as the Arduino | |
548 | compatible Intel Galileo. | |
549 | ||
3d48aab1 MW |
550 | config X86_INTEL_LPSS |
551 | bool "Intel Low Power Subsystem Support" | |
eebb3e8d | 552 | depends on X86 && ACPI |
3d48aab1 | 553 | select COMMON_CLK |
0f531431 | 554 | select PINCTRL |
eebb3e8d | 555 | select IOSF_MBI |
3d48aab1 MW |
556 | ---help--- |
557 | Select to build support for Intel Low Power Subsystem such as | |
558 | found on Intel Lynxpoint PCH. Selecting this option enables | |
0f531431 MN |
559 | things like clock tree (common clock framework) and pincontrol |
560 | which are needed by the LPSS peripheral drivers. | |
3d48aab1 | 561 | |
92082a88 KX |
562 | config X86_AMD_PLATFORM_DEVICE |
563 | bool "AMD ACPI2Platform devices support" | |
564 | depends on ACPI | |
565 | select COMMON_CLK | |
566 | select PINCTRL | |
567 | ---help--- | |
568 | Select to interpret AMD specific ACPI device to platform device | |
569 | such as I2C, UART, GPIO found on AMD Carrizo and later chipsets. | |
570 | I2C and UART depend on COMMON_CLK to set clock. GPIO driver is | |
571 | implemented under PINCTRL subsystem. | |
572 | ||
ced3ce76 DB |
573 | config IOSF_MBI |
574 | tristate "Intel SoC IOSF Sideband support for SoC platforms" | |
575 | depends on PCI | |
576 | ---help--- | |
577 | This option enables sideband register access support for Intel SoC | |
578 | platforms. On these platforms the IOSF sideband is used in lieu of | |
579 | MSR's for some register accesses, mostly but not limited to thermal | |
580 | and power. Drivers may query the availability of this device to | |
581 | determine if they need the sideband in order to work on these | |
582 | platforms. The sideband is available on the following SoC products. | |
583 | This list is not meant to be exclusive. | |
584 | - BayTrail | |
585 | - Braswell | |
586 | - Quark | |
587 | ||
588 | You should say Y if you are running a kernel on one of these SoC's. | |
589 | ||
ed2226bd DB |
590 | config IOSF_MBI_DEBUG |
591 | bool "Enable IOSF sideband access through debugfs" | |
592 | depends on IOSF_MBI && DEBUG_FS | |
593 | ---help--- | |
594 | Select this option to expose the IOSF sideband access registers (MCR, | |
595 | MDR, MCRX) through debugfs to write and read register information from | |
596 | different units on the SoC. This is most useful for obtaining device | |
597 | state information for debug and analysis. As this is a general access | |
598 | mechanism, users of this option would have specific knowledge of the | |
599 | device they want to access. | |
600 | ||
601 | If you don't require the option or are in doubt, say N. | |
602 | ||
c5c606d9 RT |
603 | config X86_RDC321X |
604 | bool "RDC R-321x SoC" | |
506f1d07 | 605 | depends on X86_32 |
c5c606d9 RT |
606 | depends on X86_EXTENDED_PLATFORM |
607 | select M486 | |
608 | select X86_REBOOTFIXUPS | |
609 | ---help--- | |
610 | This option is needed for RDC R-321x system-on-chip, also known | |
611 | as R-8610-(G). | |
612 | If you don't have one of these chips, you should say N here. | |
613 | ||
e0c7ae37 | 614 | config X86_32_NON_STANDARD |
9c398017 IM |
615 | bool "Support non-standard 32-bit SMP architectures" |
616 | depends on X86_32 && SMP | |
c5c606d9 | 617 | depends on X86_EXTENDED_PLATFORM |
8f9ca475 | 618 | ---help--- |
b5660ba7 PA |
619 | This option compiles in the bigsmp and STA2X11 default |
620 | subarchitectures. It is intended for a generic binary | |
621 | kernel. If you select them all, kernel will probe it one by | |
622 | one and will fallback to default. | |
d49c4288 | 623 | |
c5c606d9 | 624 | # Alphabetically sorted list of Non standard 32 bit platforms |
d49c4288 | 625 | |
d949f36f | 626 | config X86_SUPPORTS_MEMORY_FAILURE |
6fc108a0 | 627 | def_bool y |
d949f36f LT |
628 | # MCE code calls memory_failure(): |
629 | depends on X86_MCE | |
630 | # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags: | |
d949f36f LT |
631 | # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH: |
632 | depends on X86_64 || !SPARSEMEM | |
633 | select ARCH_SUPPORTS_MEMORY_FAILURE | |
d949f36f | 634 | |
83125a3a AR |
635 | config STA2X11 |
636 | bool "STA2X11 Companion Chip Support" | |
637 | depends on X86_32_NON_STANDARD && PCI | |
638 | select X86_DEV_DMA_OPS | |
639 | select X86_DMA_REMAP | |
640 | select SWIOTLB | |
641 | select MFD_STA2X11 | |
642 | select ARCH_REQUIRE_GPIOLIB | |
643 | default n | |
644 | ---help--- | |
645 | This adds support for boards based on the STA2X11 IO-Hub, | |
646 | a.k.a. "ConneXt". The chip is used in place of the standard | |
647 | PC chipset, so all "standard" peripherals are missing. If this | |
648 | option is selected the kernel will still be able to boot on | |
649 | standard PC machines. | |
650 | ||
82148d1d S |
651 | config X86_32_IRIS |
652 | tristate "Eurobraille/Iris poweroff module" | |
653 | depends on X86_32 | |
654 | ---help--- | |
655 | The Iris machines from EuroBraille do not have APM or ACPI support | |
656 | to shut themselves down properly. A special I/O sequence is | |
657 | needed to do so, which is what this module does at | |
658 | kernel shutdown. | |
659 | ||
660 | This is only for Iris machines from EuroBraille. | |
661 | ||
662 | If unused, say N. | |
663 | ||
ae1e9130 | 664 | config SCHED_OMIT_FRAME_POINTER |
3c2362e6 HH |
665 | def_bool y |
666 | prompt "Single-depth WCHAN output" | |
a87d0914 | 667 | depends on X86 |
8f9ca475 | 668 | ---help--- |
506f1d07 SR |
669 | Calculate simpler /proc/<PID>/wchan values. If this option |
670 | is disabled then wchan values will recurse back to the | |
671 | caller function. This provides more accurate wchan values, | |
672 | at the expense of slightly more scheduling overhead. | |
673 | ||
674 | If in doubt, say "Y". | |
675 | ||
6276a074 BP |
676 | menuconfig HYPERVISOR_GUEST |
677 | bool "Linux guest support" | |
8f9ca475 | 678 | ---help--- |
6276a074 BP |
679 | Say Y here to enable options for running Linux under various hyper- |
680 | visors. This option enables basic hypervisor detection and platform | |
681 | setup. | |
506f1d07 | 682 | |
6276a074 BP |
683 | If you say N, all options in this submenu will be skipped and |
684 | disabled, and Linux guest support won't be built in. | |
506f1d07 | 685 | |
6276a074 | 686 | if HYPERVISOR_GUEST |
506f1d07 | 687 | |
e61bd94a EPH |
688 | config PARAVIRT |
689 | bool "Enable paravirtualization code" | |
8f9ca475 | 690 | ---help--- |
e61bd94a EPH |
691 | This changes the kernel so it can modify itself when it is run |
692 | under a hypervisor, potentially improving performance significantly | |
693 | over full virtualization. However, when run without a hypervisor | |
694 | the kernel is theoretically slower and slightly larger. | |
695 | ||
6276a074 BP |
696 | config PARAVIRT_DEBUG |
697 | bool "paravirt-ops debugging" | |
698 | depends on PARAVIRT && DEBUG_KERNEL | |
699 | ---help--- | |
700 | Enable to debug paravirt_ops internals. Specifically, BUG if | |
701 | a paravirt_op is missing when it is called. | |
702 | ||
b4ecc126 JF |
703 | config PARAVIRT_SPINLOCKS |
704 | bool "Paravirtualization layer for spinlocks" | |
6ea30386 | 705 | depends on PARAVIRT && SMP |
62c7a1e9 | 706 | select UNINLINE_SPIN_UNLOCK if !QUEUED_SPINLOCKS |
b4ecc126 JF |
707 | ---help--- |
708 | Paravirtualized spinlocks allow a pvops backend to replace the | |
709 | spinlock implementation with something virtualization-friendly | |
710 | (for example, block the virtual CPU rather than spinning). | |
711 | ||
4c4e4f61 R |
712 | It has a minimal impact on native kernels and gives a nice performance |
713 | benefit on paravirtualized KVM / Xen kernels. | |
b4ecc126 | 714 | |
4c4e4f61 | 715 | If you are unsure how to answer this question, answer Y. |
b4ecc126 | 716 | |
45e898b7 WL |
717 | config QUEUED_LOCK_STAT |
718 | bool "Paravirt queued spinlock statistics" | |
719 | depends on PARAVIRT_SPINLOCKS && DEBUG_FS && QUEUED_SPINLOCKS | |
720 | ---help--- | |
721 | Enable the collection of statistical data on the slowpath | |
722 | behavior of paravirtualized queued spinlocks and report | |
723 | them on debugfs. | |
724 | ||
6276a074 | 725 | source "arch/x86/xen/Kconfig" |
7af192c9 | 726 | |
6276a074 BP |
727 | config KVM_GUEST |
728 | bool "KVM Guest support (including kvmclock)" | |
729 | depends on PARAVIRT | |
730 | select PARAVIRT_CLOCK | |
731 | default y | |
8f9ca475 | 732 | ---help--- |
6276a074 BP |
733 | This option enables various optimizations for running under the KVM |
734 | hypervisor. It includes a paravirtualized clock, so that instead | |
735 | of relying on a PIT (or probably other) emulation by the | |
736 | underlying device model, the host provides the guest with | |
737 | timing infrastructure such as time of day, and system time | |
506f1d07 | 738 | |
1e20eb85 SV |
739 | config KVM_DEBUG_FS |
740 | bool "Enable debug information for KVM Guests in debugfs" | |
741 | depends on KVM_GUEST && DEBUG_FS | |
742 | default n | |
743 | ---help--- | |
744 | This option enables collection of various statistics for KVM guest. | |
745 | Statistics are displayed in debugfs filesystem. Enabling this option | |
746 | may incur significant overhead. | |
747 | ||
6276a074 BP |
748 | source "arch/x86/lguest/Kconfig" |
749 | ||
750 | config PARAVIRT_TIME_ACCOUNTING | |
751 | bool "Paravirtual steal time accounting" | |
752 | depends on PARAVIRT | |
753 | default n | |
8f9ca475 | 754 | ---help--- |
6276a074 BP |
755 | Select this option to enable fine granularity task steal time |
756 | accounting. Time spent executing other tasks in parallel with | |
757 | the current vCPU is discounted from the vCPU power. To account for | |
758 | that, there can be a small performance impact. | |
759 | ||
760 | If in doubt, say N here. | |
761 | ||
762 | config PARAVIRT_CLOCK | |
763 | bool | |
97349135 | 764 | |
6276a074 | 765 | endif #HYPERVISOR_GUEST |
97349135 | 766 | |
08677214 | 767 | config NO_BOOTMEM |
774ea0bc | 768 | def_bool y |
08677214 | 769 | |
506f1d07 SR |
770 | source "arch/x86/Kconfig.cpu" |
771 | ||
772 | config HPET_TIMER | |
3c2362e6 | 773 | def_bool X86_64 |
506f1d07 | 774 | prompt "HPET Timer Support" if X86_32 |
8f9ca475 IM |
775 | ---help--- |
776 | Use the IA-PC HPET (High Precision Event Timer) to manage | |
777 | time in preference to the PIT and RTC, if a HPET is | |
778 | present. | |
779 | HPET is the next generation timer replacing legacy 8254s. | |
780 | The HPET provides a stable time base on SMP | |
781 | systems, unlike the TSC, but it is more expensive to access, | |
782 | as it is off-chip. You can find the HPET spec at | |
783 | <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>. | |
506f1d07 | 784 | |
8f9ca475 IM |
785 | You can safely choose Y here. However, HPET will only be |
786 | activated if the platform and the BIOS support this feature. | |
787 | Otherwise the 8254 will be used for timing services. | |
506f1d07 | 788 | |
8f9ca475 | 789 | Choose N to continue using the legacy 8254 timer. |
506f1d07 SR |
790 | |
791 | config HPET_EMULATE_RTC | |
3c2362e6 | 792 | def_bool y |
9d8af78b | 793 | depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) |
506f1d07 | 794 | |
bb24c471 | 795 | config APB_TIMER |
933b9463 AC |
796 | def_bool y if X86_INTEL_MID |
797 | prompt "Intel MID APB Timer Support" if X86_INTEL_MID | |
06c3df49 | 798 | select DW_APB_TIMER |
a0c3832a | 799 | depends on X86_INTEL_MID && SFI |
bb24c471 JP |
800 | help |
801 | APB timer is the replacement for 8254, HPET on X86 MID platforms. | |
802 | The APBT provides a stable time base on SMP | |
803 | systems, unlike the TSC, but it is more expensive to access, | |
804 | as it is off-chip. APB timers are always running regardless of CPU | |
805 | C states, they are used as per CPU clockevent device when possible. | |
806 | ||
6a108a14 | 807 | # Mark as expert because too many people got it wrong. |
506f1d07 | 808 | # The code disables itself when not needed. |
7ae9392c TP |
809 | config DMI |
810 | default y | |
cf074402 | 811 | select DMI_SCAN_MACHINE_NON_EFI_FALLBACK |
6a108a14 | 812 | bool "Enable DMI scanning" if EXPERT |
8f9ca475 | 813 | ---help--- |
7ae9392c TP |
814 | Enabled scanning of DMI to identify machine quirks. Say Y |
815 | here unless you have verified that your setup is not | |
816 | affected by entries in the DMI blacklist. Required by PNP | |
817 | BIOS code. | |
818 | ||
506f1d07 | 819 | config GART_IOMMU |
38901f1c | 820 | bool "Old AMD GART IOMMU support" |
506f1d07 | 821 | select SWIOTLB |
23ac4ae8 | 822 | depends on X86_64 && PCI && AMD_NB |
8f9ca475 | 823 | ---help--- |
ced3c42c IM |
824 | Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron |
825 | GART based hardware IOMMUs. | |
826 | ||
827 | The GART supports full DMA access for devices with 32-bit access | |
828 | limitations, on systems with more than 3 GB. This is usually needed | |
829 | for USB, sound, many IDE/SATA chipsets and some other devices. | |
830 | ||
831 | Newer systems typically have a modern AMD IOMMU, supported via | |
832 | the CONFIG_AMD_IOMMU=y config option. | |
833 | ||
834 | In normal configurations this driver is only active when needed: | |
835 | there's more than 3 GB of memory and the system contains a | |
836 | 32-bit limited device. | |
837 | ||
838 | If unsure, say Y. | |
506f1d07 SR |
839 | |
840 | config CALGARY_IOMMU | |
841 | bool "IBM Calgary IOMMU support" | |
842 | select SWIOTLB | |
6ea30386 | 843 | depends on X86_64 && PCI |
8f9ca475 | 844 | ---help--- |
506f1d07 SR |
845 | Support for hardware IOMMUs in IBM's xSeries x366 and x460 |
846 | systems. Needed to run systems with more than 3GB of memory | |
847 | properly with 32-bit PCI devices that do not support DAC | |
848 | (Double Address Cycle). Calgary also supports bus level | |
849 | isolation, where all DMAs pass through the IOMMU. This | |
850 | prevents them from going anywhere except their intended | |
851 | destination. This catches hard-to-find kernel bugs and | |
852 | mis-behaving drivers and devices that do not use the DMA-API | |
853 | properly to set up their DMA buffers. The IOMMU can be | |
854 | turned off at boot time with the iommu=off parameter. | |
855 | Normally the kernel will make the right choice by itself. | |
856 | If unsure, say Y. | |
857 | ||
858 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT | |
3c2362e6 HH |
859 | def_bool y |
860 | prompt "Should Calgary be enabled by default?" | |
506f1d07 | 861 | depends on CALGARY_IOMMU |
8f9ca475 | 862 | ---help--- |
506f1d07 SR |
863 | Should Calgary be enabled by default? if you choose 'y', Calgary |
864 | will be used (if it exists). If you choose 'n', Calgary will not be | |
865 | used even if it exists. If you choose 'n' and would like to use | |
866 | Calgary anyway, pass 'iommu=calgary' on the kernel command line. | |
867 | If unsure, say Y. | |
868 | ||
869 | # need this always selected by IOMMU for the VIA workaround | |
870 | config SWIOTLB | |
a1afd01c | 871 | def_bool y if X86_64 |
8f9ca475 | 872 | ---help--- |
506f1d07 | 873 | Support for software bounce buffers used on x86-64 systems |
4454d327 JM |
874 | which don't have a hardware IOMMU. Using this PCI devices |
875 | which can only access 32-bits of memory can be used on systems | |
876 | with more than 3 GB of memory. | |
877 | If unsure, say Y. | |
506f1d07 | 878 | |
a8522509 | 879 | config IOMMU_HELPER |
3120e25e JB |
880 | def_bool y |
881 | depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU | |
d25e26b6 | 882 | |
1184dc2f | 883 | config MAXSMP |
ddb0c5a6 | 884 | bool "Enable Maximum number of SMP Processors and NUMA Nodes" |
6ea30386 | 885 | depends on X86_64 && SMP && DEBUG_KERNEL |
36f5101a | 886 | select CPUMASK_OFFSTACK |
8f9ca475 | 887 | ---help--- |
ddb0c5a6 | 888 | Enable maximum number of CPUS and NUMA Nodes for this architecture. |
1184dc2f | 889 | If unsure, say N. |
506f1d07 SR |
890 | |
891 | config NR_CPUS | |
36f5101a | 892 | int "Maximum number of CPUs" if SMP && !MAXSMP |
2a3313f4 | 893 | range 2 8 if SMP && X86_32 && !X86_BIGSMP |
bb61ccc7 | 894 | range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK |
b53b5eda | 895 | range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64 |
78637a97 | 896 | default "1" if !SMP |
b53b5eda | 897 | default "8192" if MAXSMP |
b5660ba7 | 898 | default "32" if SMP && X86_BIGSMP |
c5c19941 KS |
899 | default "8" if SMP && X86_32 |
900 | default "64" if SMP | |
8f9ca475 | 901 | ---help--- |
506f1d07 | 902 | This allows you to specify the maximum number of CPUs which this |
bb61ccc7 | 903 | kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum |
cad14bb9 | 904 | supported value is 8192, otherwise the maximum value is 512. The |
506f1d07 SR |
905 | minimum value which makes sense is 2. |
906 | ||
907 | This is purely to save memory - each supported CPU adds | |
908 | approximately eight kilobytes to the kernel image. | |
909 | ||
910 | config SCHED_SMT | |
911 | bool "SMT (Hyperthreading) scheduler support" | |
c8e56d20 | 912 | depends on SMP |
8f9ca475 | 913 | ---help--- |
506f1d07 SR |
914 | SMT scheduler support improves the CPU scheduler's decision making |
915 | when dealing with Intel Pentium 4 chips with HyperThreading at a | |
916 | cost of slightly increased overhead in some places. If unsure say | |
917 | N here. | |
918 | ||
919 | config SCHED_MC | |
3c2362e6 HH |
920 | def_bool y |
921 | prompt "Multi-core scheduler support" | |
c8e56d20 | 922 | depends on SMP |
8f9ca475 | 923 | ---help--- |
506f1d07 SR |
924 | Multi-core scheduler support improves the CPU scheduler's decision |
925 | making when dealing with multi-core CPU chips at a cost of slightly | |
926 | increased overhead in some places. If unsure say N here. | |
927 | ||
928 | source "kernel/Kconfig.preempt" | |
929 | ||
30b8b006 TG |
930 | config UP_LATE_INIT |
931 | def_bool y | |
ba360f88 | 932 | depends on !SMP && X86_LOCAL_APIC |
30b8b006 | 933 | |
506f1d07 | 934 | config X86_UP_APIC |
50849eef JB |
935 | bool "Local APIC support on uniprocessors" if !PCI_MSI |
936 | default PCI_MSI | |
38a1dfda | 937 | depends on X86_32 && !SMP && !X86_32_NON_STANDARD |
8f9ca475 | 938 | ---help--- |
506f1d07 SR |
939 | A local APIC (Advanced Programmable Interrupt Controller) is an |
940 | integrated interrupt controller in the CPU. If you have a single-CPU | |
941 | system which has a processor with a local APIC, you can say Y here to | |
942 | enable and use it. If you say Y here even though your machine doesn't | |
943 | have a local APIC, then the kernel will still run with no slowdown at | |
944 | all. The local APIC supports CPU-generated self-interrupts (timer, | |
945 | performance counters), and the NMI watchdog which detects hard | |
946 | lockups. | |
947 | ||
948 | config X86_UP_IOAPIC | |
949 | bool "IO-APIC support on uniprocessors" | |
950 | depends on X86_UP_APIC | |
8f9ca475 | 951 | ---help--- |
506f1d07 SR |
952 | An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an |
953 | SMP-capable replacement for PC-style interrupt controllers. Most | |
954 | SMP systems and many recent uniprocessor systems have one. | |
955 | ||
956 | If you have a single-CPU system with an IO-APIC, you can say Y here | |
957 | to use it. If you say Y here even though your machine doesn't have | |
958 | an IO-APIC, then the kernel will still run with no slowdown at all. | |
959 | ||
960 | config X86_LOCAL_APIC | |
3c2362e6 | 961 | def_bool y |
0dbc6078 | 962 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI |
b5dc8e6c | 963 | select IRQ_DOMAIN_HIERARCHY |
52f518a3 | 964 | select PCI_MSI_IRQ_DOMAIN if PCI_MSI |
506f1d07 SR |
965 | |
966 | config X86_IO_APIC | |
b1da1e71 JB |
967 | def_bool y |
968 | depends on X86_LOCAL_APIC || X86_UP_IOAPIC | |
506f1d07 | 969 | |
41b9eb26 SA |
970 | config X86_REROUTE_FOR_BROKEN_BOOT_IRQS |
971 | bool "Reroute for broken boot IRQs" | |
41b9eb26 | 972 | depends on X86_IO_APIC |
8f9ca475 | 973 | ---help--- |
41b9eb26 SA |
974 | This option enables a workaround that fixes a source of |
975 | spurious interrupts. This is recommended when threaded | |
976 | interrupt handling is used on systems where the generation of | |
977 | superfluous "boot interrupts" cannot be disabled. | |
978 | ||
979 | Some chipsets generate a legacy INTx "boot IRQ" when the IRQ | |
980 | entry in the chipset's IO-APIC is masked (as, e.g. the RT | |
981 | kernel does during interrupt handling). On chipsets where this | |
982 | boot IRQ generation cannot be disabled, this workaround keeps | |
983 | the original IRQ line masked so that only the equivalent "boot | |
984 | IRQ" is delivered to the CPUs. The workaround also tells the | |
985 | kernel to set up the IRQ handler on the boot IRQ line. In this | |
986 | way only one interrupt is delivered to the kernel. Otherwise | |
987 | the spurious second interrupt may cause the kernel to bring | |
988 | down (vital) interrupt lines. | |
989 | ||
990 | Only affects "broken" chipsets. Interrupt sharing may be | |
991 | increased on these systems. | |
992 | ||
506f1d07 | 993 | config X86_MCE |
bab9bc65 | 994 | bool "Machine Check / overheating reporting" |
648ed940 | 995 | select GENERIC_ALLOCATOR |
e57dbaf7 | 996 | default y |
506f1d07 | 997 | ---help--- |
bab9bc65 AK |
998 | Machine Check support allows the processor to notify the |
999 | kernel if it detects a problem (e.g. overheating, data corruption). | |
506f1d07 | 1000 | The action the kernel takes depends on the severity of the problem, |
bab9bc65 | 1001 | ranging from warning messages to halting the machine. |
4efc0670 | 1002 | |
506f1d07 | 1003 | config X86_MCE_INTEL |
3c2362e6 HH |
1004 | def_bool y |
1005 | prompt "Intel MCE features" | |
c1ebf835 | 1006 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 1007 | ---help--- |
506f1d07 SR |
1008 | Additional support for intel specific MCE features such as |
1009 | the thermal monitor. | |
1010 | ||
1011 | config X86_MCE_AMD | |
3c2362e6 HH |
1012 | def_bool y |
1013 | prompt "AMD MCE features" | |
c1ebf835 | 1014 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 1015 | ---help--- |
506f1d07 SR |
1016 | Additional support for AMD specific MCE features such as |
1017 | the DRAM Error Threshold. | |
1018 | ||
4efc0670 | 1019 | config X86_ANCIENT_MCE |
6fc108a0 | 1020 | bool "Support for old Pentium 5 / WinChip machine checks" |
c31d9633 | 1021 | depends on X86_32 && X86_MCE |
cd13adcc HS |
1022 | ---help--- |
1023 | Include support for machine check handling on old Pentium 5 or WinChip | |
5065a706 | 1024 | systems. These typically need to be enabled explicitly on the command |
cd13adcc | 1025 | line. |
4efc0670 | 1026 | |
b2762686 AK |
1027 | config X86_MCE_THRESHOLD |
1028 | depends on X86_MCE_AMD || X86_MCE_INTEL | |
6fc108a0 | 1029 | def_bool y |
b2762686 | 1030 | |
ea149b36 | 1031 | config X86_MCE_INJECT |
c1ebf835 | 1032 | depends on X86_MCE |
ea149b36 AK |
1033 | tristate "Machine check injector support" |
1034 | ---help--- | |
1035 | Provide support for injecting machine checks for testing purposes. | |
1036 | If you don't know what a machine check is and you don't do kernel | |
1037 | QA it is safe to say n. | |
1038 | ||
4efc0670 AK |
1039 | config X86_THERMAL_VECTOR |
1040 | def_bool y | |
5bb38adc | 1041 | depends on X86_MCE_INTEL |
4efc0670 | 1042 | |
5aef51c3 | 1043 | config X86_LEGACY_VM86 |
1e642812 | 1044 | bool "Legacy VM86 support" |
5aef51c3 | 1045 | default n |
506f1d07 | 1046 | depends on X86_32 |
8f9ca475 | 1047 | ---help--- |
5aef51c3 AL |
1048 | This option allows user programs to put the CPU into V8086 |
1049 | mode, which is an 80286-era approximation of 16-bit real mode. | |
1050 | ||
1051 | Some very old versions of X and/or vbetool require this option | |
1052 | for user mode setting. Similarly, DOSEMU will use it if | |
1053 | available to accelerate real mode DOS programs. However, any | |
1054 | recent version of DOSEMU, X, or vbetool should be fully | |
1055 | functional even without kernel VM86 support, as they will all | |
1e642812 IM |
1056 | fall back to software emulation. Nevertheless, if you are using |
1057 | a 16-bit DOS program where 16-bit performance matters, vm86 | |
1058 | mode might be faster than emulation and you might want to | |
1059 | enable this option. | |
5aef51c3 | 1060 | |
1e642812 IM |
1061 | Note that any app that works on a 64-bit kernel is unlikely to |
1062 | need this option, as 64-bit kernels don't, and can't, support | |
1063 | V8086 mode. This option is also unrelated to 16-bit protected | |
1064 | mode and is not needed to run most 16-bit programs under Wine. | |
5aef51c3 | 1065 | |
1e642812 IM |
1066 | Enabling this option increases the complexity of the kernel |
1067 | and slows down exception handling a tiny bit. | |
5aef51c3 | 1068 | |
1e642812 | 1069 | If unsure, say N here. |
5aef51c3 AL |
1070 | |
1071 | config VM86 | |
1072 | bool | |
1073 | default X86_LEGACY_VM86 | |
34273f41 PA |
1074 | |
1075 | config X86_16BIT | |
1076 | bool "Enable support for 16-bit segments" if EXPERT | |
1077 | default y | |
a5b9e5a2 | 1078 | depends on MODIFY_LDT_SYSCALL |
34273f41 PA |
1079 | ---help--- |
1080 | This option is required by programs like Wine to run 16-bit | |
1081 | protected mode legacy code on x86 processors. Disabling | |
1082 | this option saves about 300 bytes on i386, or around 6K text | |
1083 | plus 16K runtime memory on x86-64, | |
1084 | ||
1085 | config X86_ESPFIX32 | |
1086 | def_bool y | |
1087 | depends on X86_16BIT && X86_32 | |
506f1d07 | 1088 | |
197725de PA |
1089 | config X86_ESPFIX64 |
1090 | def_bool y | |
34273f41 | 1091 | depends on X86_16BIT && X86_64 |
506f1d07 | 1092 | |
1ad83c85 AL |
1093 | config X86_VSYSCALL_EMULATION |
1094 | bool "Enable vsyscall emulation" if EXPERT | |
1095 | default y | |
1096 | depends on X86_64 | |
1097 | ---help--- | |
1098 | This enables emulation of the legacy vsyscall page. Disabling | |
1099 | it is roughly equivalent to booting with vsyscall=none, except | |
1100 | that it will also disable the helpful warning if a program | |
1101 | tries to use a vsyscall. With this option set to N, offending | |
1102 | programs will just segfault, citing addresses of the form | |
1103 | 0xffffffffff600?00. | |
1104 | ||
1105 | This option is required by many programs built before 2013, and | |
1106 | care should be used even with newer programs if set to N. | |
1107 | ||
1108 | Disabling this option saves about 7K of kernel size and | |
1109 | possibly 4K of additional runtime pagetable memory. | |
1110 | ||
506f1d07 SR |
1111 | config TOSHIBA |
1112 | tristate "Toshiba Laptop support" | |
1113 | depends on X86_32 | |
1114 | ---help--- | |
1115 | This adds a driver to safely access the System Management Mode of | |
1116 | the CPU on Toshiba portables with a genuine Toshiba BIOS. It does | |
1117 | not work on models with a Phoenix BIOS. The System Management Mode | |
1118 | is used to set the BIOS and power saving options on Toshiba portables. | |
1119 | ||
1120 | For information on utilities to make use of this driver see the | |
1121 | Toshiba Linux utilities web site at: | |
1122 | <http://www.buzzard.org.uk/toshiba/>. | |
1123 | ||
1124 | Say Y if you intend to run this kernel on a Toshiba portable. | |
1125 | Say N otherwise. | |
1126 | ||
1127 | config I8K | |
039ae585 | 1128 | tristate "Dell i8k legacy laptop support" |
949a9d70 | 1129 | select HWMON |
039ae585 | 1130 | select SENSORS_DELL_SMM |
506f1d07 | 1131 | ---help--- |
039ae585 PR |
1132 | This option enables legacy /proc/i8k userspace interface in hwmon |
1133 | dell-smm-hwmon driver. Character file /proc/i8k reports bios version, | |
1134 | temperature and allows controlling fan speeds of Dell laptops via | |
1135 | System Management Mode. For old Dell laptops (like Dell Inspiron 8000) | |
1136 | it reports also power and hotkey status. For fan speed control is | |
1137 | needed userspace package i8kutils. | |
1138 | ||
1139 | Say Y if you intend to run this kernel on old Dell laptops or want to | |
1140 | use userspace package i8kutils. | |
506f1d07 SR |
1141 | Say N otherwise. |
1142 | ||
1143 | config X86_REBOOTFIXUPS | |
9ba16087 JB |
1144 | bool "Enable X86 board specific fixups for reboot" |
1145 | depends on X86_32 | |
506f1d07 SR |
1146 | ---help--- |
1147 | This enables chipset and/or board specific fixups to be done | |
1148 | in order to get reboot to work correctly. This is only needed on | |
1149 | some combinations of hardware and BIOS. The symptom, for which | |
1150 | this config is intended, is when reboot ends with a stalled/hung | |
1151 | system. | |
1152 | ||
1153 | Currently, the only fixup is for the Geode machines using | |
5e3a77e9 | 1154 | CS5530A and CS5536 chipsets and the RDC R-321x SoC. |
506f1d07 SR |
1155 | |
1156 | Say Y if you want to enable the fixup. Currently, it's safe to | |
1157 | enable this option even if you don't need it. | |
1158 | Say N otherwise. | |
1159 | ||
1160 | config MICROCODE | |
9a2bc335 BP |
1161 | bool "CPU microcode loading support" |
1162 | default y | |
80030e3d | 1163 | depends on CPU_SUP_AMD || CPU_SUP_INTEL |
fe055896 | 1164 | depends on BLK_DEV_INITRD |
506f1d07 SR |
1165 | select FW_LOADER |
1166 | ---help--- | |
e43f6e67 | 1167 | |
506f1d07 | 1168 | If you say Y here, you will be able to update the microcode on |
80cc9f10 | 1169 | certain Intel and AMD processors. The Intel support is for the |
e43f6e67 BP |
1170 | IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, |
1171 | Xeon etc. The AMD support is for families 0x10 and later. You will | |
1172 | obviously need the actual microcode binary data itself which is not | |
1173 | shipped with the Linux kernel. | |
506f1d07 | 1174 | |
8d86f390 PO |
1175 | This option selects the general module only, you need to select |
1176 | at least one vendor specific module as well. | |
506f1d07 | 1177 | |
e43f6e67 BP |
1178 | To compile this driver as a module, choose M here: the module |
1179 | will be called microcode. | |
506f1d07 | 1180 | |
8d86f390 | 1181 | config MICROCODE_INTEL |
e43f6e67 | 1182 | bool "Intel microcode loading support" |
8f9ca475 IM |
1183 | depends on MICROCODE |
1184 | default MICROCODE | |
1185 | select FW_LOADER | |
1186 | ---help--- | |
1187 | This options enables microcode patch loading support for Intel | |
1188 | processors. | |
1189 | ||
b8989db9 A |
1190 | For the current Intel microcode data package go to |
1191 | <https://downloadcenter.intel.com> and search for | |
1192 | 'Linux Processor Microcode Data File'. | |
8d86f390 | 1193 | |
80cc9f10 | 1194 | config MICROCODE_AMD |
e43f6e67 | 1195 | bool "AMD microcode loading support" |
8f9ca475 IM |
1196 | depends on MICROCODE |
1197 | select FW_LOADER | |
1198 | ---help--- | |
1199 | If you select this option, microcode patch loading support for AMD | |
1200 | processors will be enabled. | |
80cc9f10 | 1201 | |
8f9ca475 | 1202 | config MICROCODE_OLD_INTERFACE |
3c2362e6 | 1203 | def_bool y |
506f1d07 | 1204 | depends on MICROCODE |
506f1d07 SR |
1205 | |
1206 | config X86_MSR | |
1207 | tristate "/dev/cpu/*/msr - Model-specific register support" | |
8f9ca475 | 1208 | ---help--- |
506f1d07 SR |
1209 | This device gives privileged processes access to the x86 |
1210 | Model-Specific Registers (MSRs). It is a character device with | |
1211 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. | |
1212 | MSR accesses are directed to a specific CPU on multi-processor | |
1213 | systems. | |
1214 | ||
1215 | config X86_CPUID | |
1216 | tristate "/dev/cpu/*/cpuid - CPU information support" | |
8f9ca475 | 1217 | ---help--- |
506f1d07 SR |
1218 | This device gives processes access to the x86 CPUID instruction to |
1219 | be executed on a specific processor. It is a character device | |
1220 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to | |
1221 | /dev/cpu/31/cpuid. | |
1222 | ||
1223 | choice | |
1224 | prompt "High Memory Support" | |
6fc108a0 | 1225 | default HIGHMEM4G |
506f1d07 SR |
1226 | depends on X86_32 |
1227 | ||
1228 | config NOHIGHMEM | |
1229 | bool "off" | |
506f1d07 SR |
1230 | ---help--- |
1231 | Linux can use up to 64 Gigabytes of physical memory on x86 systems. | |
1232 | However, the address space of 32-bit x86 processors is only 4 | |
1233 | Gigabytes large. That means that, if you have a large amount of | |
1234 | physical memory, not all of it can be "permanently mapped" by the | |
1235 | kernel. The physical memory that's not permanently mapped is called | |
1236 | "high memory". | |
1237 | ||
1238 | If you are compiling a kernel which will never run on a machine with | |
1239 | more than 1 Gigabyte total physical RAM, answer "off" here (default | |
1240 | choice and suitable for most users). This will result in a "3GB/1GB" | |
1241 | split: 3GB are mapped so that each process sees a 3GB virtual memory | |
1242 | space and the remaining part of the 4GB virtual memory space is used | |
1243 | by the kernel to permanently map as much physical memory as | |
1244 | possible. | |
1245 | ||
1246 | If the machine has between 1 and 4 Gigabytes physical RAM, then | |
1247 | answer "4GB" here. | |
1248 | ||
1249 | If more than 4 Gigabytes is used then answer "64GB" here. This | |
1250 | selection turns Intel PAE (Physical Address Extension) mode on. | |
1251 | PAE implements 3-level paging on IA32 processors. PAE is fully | |
1252 | supported by Linux, PAE mode is implemented on all recent Intel | |
1253 | processors (Pentium Pro and better). NOTE: If you say "64GB" here, | |
1254 | then the kernel will not boot on CPUs that don't support PAE! | |
1255 | ||
1256 | The actual amount of total physical memory will either be | |
1257 | auto detected or can be forced by using a kernel command line option | |
1258 | such as "mem=256M". (Try "man bootparam" or see the documentation of | |
1259 | your boot loader (lilo or loadlin) about how to pass options to the | |
1260 | kernel at boot time.) | |
1261 | ||
1262 | If unsure, say "off". | |
1263 | ||
1264 | config HIGHMEM4G | |
1265 | bool "4GB" | |
8f9ca475 | 1266 | ---help--- |
506f1d07 SR |
1267 | Select this if you have a 32-bit processor and between 1 and 4 |
1268 | gigabytes of physical RAM. | |
1269 | ||
1270 | config HIGHMEM64G | |
1271 | bool "64GB" | |
eb068e78 | 1272 | depends on !M486 |
506f1d07 | 1273 | select X86_PAE |
8f9ca475 | 1274 | ---help--- |
506f1d07 SR |
1275 | Select this if you have a 32-bit processor and more than 4 |
1276 | gigabytes of physical RAM. | |
1277 | ||
1278 | endchoice | |
1279 | ||
1280 | choice | |
6a108a14 | 1281 | prompt "Memory split" if EXPERT |
506f1d07 SR |
1282 | default VMSPLIT_3G |
1283 | depends on X86_32 | |
8f9ca475 | 1284 | ---help--- |
506f1d07 SR |
1285 | Select the desired split between kernel and user memory. |
1286 | ||
1287 | If the address range available to the kernel is less than the | |
1288 | physical memory installed, the remaining memory will be available | |
1289 | as "high memory". Accessing high memory is a little more costly | |
1290 | than low memory, as it needs to be mapped into the kernel first. | |
1291 | Note that increasing the kernel address space limits the range | |
1292 | available to user programs, making the address space there | |
1293 | tighter. Selecting anything other than the default 3G/1G split | |
1294 | will also likely make your kernel incompatible with binary-only | |
1295 | kernel modules. | |
1296 | ||
1297 | If you are not absolutely sure what you are doing, leave this | |
1298 | option alone! | |
1299 | ||
1300 | config VMSPLIT_3G | |
1301 | bool "3G/1G user/kernel split" | |
1302 | config VMSPLIT_3G_OPT | |
1303 | depends on !X86_PAE | |
1304 | bool "3G/1G user/kernel split (for full 1G low memory)" | |
1305 | config VMSPLIT_2G | |
1306 | bool "2G/2G user/kernel split" | |
1307 | config VMSPLIT_2G_OPT | |
1308 | depends on !X86_PAE | |
1309 | bool "2G/2G user/kernel split (for full 2G low memory)" | |
1310 | config VMSPLIT_1G | |
1311 | bool "1G/3G user/kernel split" | |
1312 | endchoice | |
1313 | ||
1314 | config PAGE_OFFSET | |
1315 | hex | |
1316 | default 0xB0000000 if VMSPLIT_3G_OPT | |
1317 | default 0x80000000 if VMSPLIT_2G | |
1318 | default 0x78000000 if VMSPLIT_2G_OPT | |
1319 | default 0x40000000 if VMSPLIT_1G | |
1320 | default 0xC0000000 | |
1321 | depends on X86_32 | |
1322 | ||
1323 | config HIGHMEM | |
3c2362e6 | 1324 | def_bool y |
506f1d07 | 1325 | depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) |
506f1d07 SR |
1326 | |
1327 | config X86_PAE | |
9ba16087 | 1328 | bool "PAE (Physical Address Extension) Support" |
506f1d07 | 1329 | depends on X86_32 && !HIGHMEM4G |
9d99c712 | 1330 | select SWIOTLB |
8f9ca475 | 1331 | ---help--- |
506f1d07 SR |
1332 | PAE is required for NX support, and furthermore enables |
1333 | larger swapspace support for non-overcommit purposes. It | |
1334 | has the cost of more pagetable lookup overhead, and also | |
1335 | consumes more pagetable space per process. | |
1336 | ||
600715dc | 1337 | config ARCH_PHYS_ADDR_T_64BIT |
3120e25e JB |
1338 | def_bool y |
1339 | depends on X86_64 || X86_PAE | |
600715dc | 1340 | |
66f2b061 | 1341 | config ARCH_DMA_ADDR_T_64BIT |
3120e25e JB |
1342 | def_bool y |
1343 | depends on X86_64 || HIGHMEM64G | |
66f2b061 | 1344 | |
10971ab2 | 1345 | config X86_DIRECT_GBPAGES |
e5008abe LR |
1346 | def_bool y |
1347 | depends on X86_64 && !DEBUG_PAGEALLOC && !KMEMCHECK | |
8f9ca475 | 1348 | ---help--- |
10971ab2 IM |
1349 | Certain kernel features effectively disable kernel |
1350 | linear 1 GB mappings (even if the CPU otherwise | |
1351 | supports them), so don't confuse the user by printing | |
1352 | that we have them enabled. | |
9e899816 | 1353 | |
506f1d07 SR |
1354 | # Common NUMA Features |
1355 | config NUMA | |
fd51b2d7 | 1356 | bool "Numa Memory Allocation and Scheduler Support" |
506f1d07 | 1357 | depends on SMP |
b5660ba7 PA |
1358 | depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP) |
1359 | default y if X86_BIGSMP | |
8f9ca475 | 1360 | ---help--- |
506f1d07 | 1361 | Enable NUMA (Non Uniform Memory Access) support. |
fd51b2d7 | 1362 | |
506f1d07 SR |
1363 | The kernel will try to allocate memory used by a CPU on the |
1364 | local memory controller of the CPU and add some more | |
1365 | NUMA awareness to the kernel. | |
1366 | ||
c280ea5e | 1367 | For 64-bit this is recommended if the system is Intel Core i7 |
fd51b2d7 KM |
1368 | (or later), AMD Opteron, or EM64T NUMA. |
1369 | ||
b5660ba7 | 1370 | For 32-bit this is only needed if you boot a 32-bit |
7cf6c945 | 1371 | kernel on a 64-bit NUMA platform. |
fd51b2d7 KM |
1372 | |
1373 | Otherwise, you should say N. | |
506f1d07 | 1374 | |
eec1d4fa | 1375 | config AMD_NUMA |
3c2362e6 HH |
1376 | def_bool y |
1377 | prompt "Old style AMD Opteron NUMA detection" | |
5da0ef9a | 1378 | depends on X86_64 && NUMA && PCI |
8f9ca475 | 1379 | ---help--- |
eec1d4fa HR |
1380 | Enable AMD NUMA node topology detection. You should say Y here if |
1381 | you have a multi processor AMD system. This uses an old method to | |
1382 | read the NUMA configuration directly from the builtin Northbridge | |
1383 | of Opteron. It is recommended to use X86_64_ACPI_NUMA instead, | |
1384 | which also takes priority if both are compiled in. | |
506f1d07 SR |
1385 | |
1386 | config X86_64_ACPI_NUMA | |
3c2362e6 HH |
1387 | def_bool y |
1388 | prompt "ACPI NUMA detection" | |
506f1d07 SR |
1389 | depends on X86_64 && NUMA && ACPI && PCI |
1390 | select ACPI_NUMA | |
8f9ca475 | 1391 | ---help--- |
506f1d07 SR |
1392 | Enable ACPI SRAT based node topology detection. |
1393 | ||
6ec6e0d9 SS |
1394 | # Some NUMA nodes have memory ranges that span |
1395 | # other nodes. Even though a pfn is valid and | |
1396 | # between a node's start and end pfns, it may not | |
1397 | # reside on that node. See memmap_init_zone() | |
1398 | # for details. | |
1399 | config NODES_SPAN_OTHER_NODES | |
1400 | def_bool y | |
1401 | depends on X86_64_ACPI_NUMA | |
1402 | ||
506f1d07 SR |
1403 | config NUMA_EMU |
1404 | bool "NUMA emulation" | |
1b7e03ef | 1405 | depends on NUMA |
8f9ca475 | 1406 | ---help--- |
506f1d07 SR |
1407 | Enable NUMA emulation. A flat machine will be split |
1408 | into virtual nodes when booted with "numa=fake=N", where N is the | |
1409 | number of nodes. This is only useful for debugging. | |
1410 | ||
1411 | config NODES_SHIFT | |
d25e26b6 | 1412 | int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP |
51591e31 DR |
1413 | range 1 10 |
1414 | default "10" if MAXSMP | |
506f1d07 | 1415 | default "6" if X86_64 |
506f1d07 SR |
1416 | default "3" |
1417 | depends on NEED_MULTIPLE_NODES | |
8f9ca475 | 1418 | ---help--- |
1184dc2f | 1419 | Specify the maximum number of NUMA Nodes available on the target |
692105b8 | 1420 | system. Increases memory reserved to accommodate various tables. |
506f1d07 | 1421 | |
506f1d07 | 1422 | config ARCH_HAVE_MEMORY_PRESENT |
3c2362e6 | 1423 | def_bool y |
506f1d07 | 1424 | depends on X86_32 && DISCONTIGMEM |
506f1d07 SR |
1425 | |
1426 | config NEED_NODE_MEMMAP_SIZE | |
3c2362e6 | 1427 | def_bool y |
506f1d07 | 1428 | depends on X86_32 && (DISCONTIGMEM || SPARSEMEM) |
506f1d07 | 1429 | |
506f1d07 SR |
1430 | config ARCH_FLATMEM_ENABLE |
1431 | def_bool y | |
3b16651f | 1432 | depends on X86_32 && !NUMA |
506f1d07 SR |
1433 | |
1434 | config ARCH_DISCONTIGMEM_ENABLE | |
1435 | def_bool y | |
b263295d | 1436 | depends on NUMA && X86_32 |
506f1d07 SR |
1437 | |
1438 | config ARCH_DISCONTIGMEM_DEFAULT | |
1439 | def_bool y | |
b263295d CL |
1440 | depends on NUMA && X86_32 |
1441 | ||
506f1d07 SR |
1442 | config ARCH_SPARSEMEM_ENABLE |
1443 | def_bool y | |
6ea30386 | 1444 | depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD |
506f1d07 SR |
1445 | select SPARSEMEM_STATIC if X86_32 |
1446 | select SPARSEMEM_VMEMMAP_ENABLE if X86_64 | |
1447 | ||
3b16651f TH |
1448 | config ARCH_SPARSEMEM_DEFAULT |
1449 | def_bool y | |
1450 | depends on X86_64 | |
1451 | ||
506f1d07 SR |
1452 | config ARCH_SELECT_MEMORY_MODEL |
1453 | def_bool y | |
b263295d | 1454 | depends on ARCH_SPARSEMEM_ENABLE |
506f1d07 SR |
1455 | |
1456 | config ARCH_MEMORY_PROBE | |
a0842b70 | 1457 | bool "Enable sysfs memory/probe interface" |
3120e25e | 1458 | depends on X86_64 && MEMORY_HOTPLUG |
a0842b70 TK |
1459 | help |
1460 | This option enables a sysfs memory/probe interface for testing. | |
1461 | See Documentation/memory-hotplug.txt for more information. | |
1462 | If you are unsure how to answer this question, answer N. | |
506f1d07 | 1463 | |
3b16651f TH |
1464 | config ARCH_PROC_KCORE_TEXT |
1465 | def_bool y | |
1466 | depends on X86_64 && PROC_KCORE | |
1467 | ||
a29815a3 AK |
1468 | config ILLEGAL_POINTER_VALUE |
1469 | hex | |
1470 | default 0 if X86_32 | |
1471 | default 0xdead000000000000 if X86_64 | |
1472 | ||
506f1d07 SR |
1473 | source "mm/Kconfig" |
1474 | ||
7a67832c DW |
1475 | config X86_PMEM_LEGACY_DEVICE |
1476 | bool | |
1477 | ||
ec776ef6 | 1478 | config X86_PMEM_LEGACY |
7a67832c | 1479 | tristate "Support non-standard NVDIMMs and ADR protected memory" |
9f53f9fa DW |
1480 | depends on PHYS_ADDR_T_64BIT |
1481 | depends on BLK_DEV | |
7a67832c | 1482 | select X86_PMEM_LEGACY_DEVICE |
9f53f9fa | 1483 | select LIBNVDIMM |
ec776ef6 CH |
1484 | help |
1485 | Treat memory marked using the non-standard e820 type of 12 as used | |
1486 | by the Intel Sandy Bridge-EP reference BIOS as protected memory. | |
1487 | The kernel will offer these regions to the 'pmem' driver so | |
1488 | they can be used for persistent storage. | |
1489 | ||
1490 | Say Y if unsure. | |
1491 | ||
506f1d07 SR |
1492 | config HIGHPTE |
1493 | bool "Allocate 3rd-level pagetables from highmem" | |
6fc108a0 | 1494 | depends on HIGHMEM |
8f9ca475 | 1495 | ---help--- |
506f1d07 SR |
1496 | The VM uses one page table entry for each page of physical memory. |
1497 | For systems with a lot of RAM, this can be wasteful of precious | |
1498 | low memory. Setting this option will put user-space page table | |
1499 | entries in high memory. | |
1500 | ||
9f077871 | 1501 | config X86_CHECK_BIOS_CORRUPTION |
8f9ca475 IM |
1502 | bool "Check for low memory corruption" |
1503 | ---help--- | |
1504 | Periodically check for memory corruption in low memory, which | |
1505 | is suspected to be caused by BIOS. Even when enabled in the | |
1506 | configuration, it is disabled at runtime. Enable it by | |
1507 | setting "memory_corruption_check=1" on the kernel command | |
1508 | line. By default it scans the low 64k of memory every 60 | |
1509 | seconds; see the memory_corruption_check_size and | |
1510 | memory_corruption_check_period parameters in | |
1511 | Documentation/kernel-parameters.txt to adjust this. | |
1512 | ||
1513 | When enabled with the default parameters, this option has | |
1514 | almost no overhead, as it reserves a relatively small amount | |
1515 | of memory and scans it infrequently. It both detects corruption | |
1516 | and prevents it from affecting the running system. | |
1517 | ||
1518 | It is, however, intended as a diagnostic tool; if repeatable | |
1519 | BIOS-originated corruption always affects the same memory, | |
1520 | you can use memmap= to prevent the kernel from using that | |
1521 | memory. | |
9f077871 | 1522 | |
c885df50 | 1523 | config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK |
8f9ca475 | 1524 | bool "Set the default setting of memory_corruption_check" |
c885df50 JF |
1525 | depends on X86_CHECK_BIOS_CORRUPTION |
1526 | default y | |
8f9ca475 IM |
1527 | ---help--- |
1528 | Set whether the default state of memory_corruption_check is | |
1529 | on or off. | |
c885df50 | 1530 | |
9ea77bdb | 1531 | config X86_RESERVE_LOW |
d0cd7425 PA |
1532 | int "Amount of low memory, in kilobytes, to reserve for the BIOS" |
1533 | default 64 | |
1534 | range 4 640 | |
8f9ca475 | 1535 | ---help--- |
d0cd7425 PA |
1536 | Specify the amount of low memory to reserve for the BIOS. |
1537 | ||
1538 | The first page contains BIOS data structures that the kernel | |
1539 | must not use, so that page must always be reserved. | |
1540 | ||
1541 | By default we reserve the first 64K of physical RAM, as a | |
1542 | number of BIOSes are known to corrupt that memory range | |
1543 | during events such as suspend/resume or monitor cable | |
1544 | insertion, so it must not be used by the kernel. | |
fc381519 | 1545 | |
d0cd7425 PA |
1546 | You can set this to 4 if you are absolutely sure that you |
1547 | trust the BIOS to get all its memory reservations and usages | |
1548 | right. If you know your BIOS have problems beyond the | |
1549 | default 64K area, you can set this to 640 to avoid using the | |
1550 | entire low memory range. | |
fc381519 | 1551 | |
d0cd7425 PA |
1552 | If you have doubts about the BIOS (e.g. suspend/resume does |
1553 | not work or there's kernel crashes after certain hardware | |
1554 | hotplug events) then you might want to enable | |
1555 | X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check | |
1556 | typical corruption patterns. | |
fc381519 | 1557 | |
d0cd7425 | 1558 | Leave this to the default value of 64 if you are unsure. |
fc381519 | 1559 | |
506f1d07 SR |
1560 | config MATH_EMULATION |
1561 | bool | |
a5b9e5a2 | 1562 | depends on MODIFY_LDT_SYSCALL |
506f1d07 SR |
1563 | prompt "Math emulation" if X86_32 |
1564 | ---help--- | |
1565 | Linux can emulate a math coprocessor (used for floating point | |
1566 | operations) if you don't have one. 486DX and Pentium processors have | |
1567 | a math coprocessor built in, 486SX and 386 do not, unless you added | |
1568 | a 487DX or 387, respectively. (The messages during boot time can | |
1569 | give you some hints here ["man dmesg"].) Everyone needs either a | |
1570 | coprocessor or this emulation. | |
1571 | ||
1572 | If you don't have a math coprocessor, you need to say Y here; if you | |
1573 | say Y here even though you have a coprocessor, the coprocessor will | |
1574 | be used nevertheless. (This behavior can be changed with the kernel | |
1575 | command line option "no387", which comes handy if your coprocessor | |
1576 | is broken. Try "man bootparam" or see the documentation of your boot | |
1577 | loader (lilo or loadlin) about how to pass options to the kernel at | |
1578 | boot time.) This means that it is a good idea to say Y here if you | |
1579 | intend to use this kernel on different machines. | |
1580 | ||
1581 | More information about the internals of the Linux math coprocessor | |
1582 | emulation can be found in <file:arch/x86/math-emu/README>. | |
1583 | ||
1584 | If you are not sure, say Y; apart from resulting in a 66 KB bigger | |
1585 | kernel, it won't hurt. | |
1586 | ||
1587 | config MTRR | |
6fc108a0 | 1588 | def_bool y |
6a108a14 | 1589 | prompt "MTRR (Memory Type Range Register) support" if EXPERT |
506f1d07 SR |
1590 | ---help--- |
1591 | On Intel P6 family processors (Pentium Pro, Pentium II and later) | |
1592 | the Memory Type Range Registers (MTRRs) may be used to control | |
1593 | processor access to memory ranges. This is most useful if you have | |
1594 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining | |
1595 | allows bus write transfers to be combined into a larger transfer | |
1596 | before bursting over the PCI/AGP bus. This can increase performance | |
1597 | of image write operations 2.5 times or more. Saying Y here creates a | |
1598 | /proc/mtrr file which may be used to manipulate your processor's | |
1599 | MTRRs. Typically the X server should use this. | |
1600 | ||
1601 | This code has a reasonably generic interface so that similar | |
1602 | control registers on other processors can be easily supported | |
1603 | as well: | |
1604 | ||
1605 | The Cyrix 6x86, 6x86MX and M II processors have Address Range | |
1606 | Registers (ARRs) which provide a similar functionality to MTRRs. For | |
1607 | these, the ARRs are used to emulate the MTRRs. | |
1608 | The AMD K6-2 (stepping 8 and above) and K6-3 processors have two | |
1609 | MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing | |
1610 | write-combining. All of these processors are supported by this code | |
1611 | and it makes sense to say Y here if you have one of them. | |
1612 | ||
1613 | Saying Y here also fixes a problem with buggy SMP BIOSes which only | |
1614 | set the MTRRs for the boot CPU and not for the secondary CPUs. This | |
1615 | can lead to all sorts of problems, so it's good to say Y here. | |
1616 | ||
1617 | You can safely say Y even if your machine doesn't have MTRRs, you'll | |
1618 | just add about 9 KB to your kernel. | |
1619 | ||
7225e751 | 1620 | See <file:Documentation/x86/mtrr.txt> for more information. |
506f1d07 | 1621 | |
95ffa243 | 1622 | config MTRR_SANITIZER |
2ffb3501 | 1623 | def_bool y |
95ffa243 YL |
1624 | prompt "MTRR cleanup support" |
1625 | depends on MTRR | |
8f9ca475 | 1626 | ---help--- |
aba3728c TG |
1627 | Convert MTRR layout from continuous to discrete, so X drivers can |
1628 | add writeback entries. | |
95ffa243 | 1629 | |
aba3728c | 1630 | Can be disabled with disable_mtrr_cleanup on the kernel command line. |
692105b8 | 1631 | The largest mtrr entry size for a continuous block can be set with |
aba3728c | 1632 | mtrr_chunk_size. |
95ffa243 | 1633 | |
2ffb3501 | 1634 | If unsure, say Y. |
95ffa243 YL |
1635 | |
1636 | config MTRR_SANITIZER_ENABLE_DEFAULT | |
f5098d62 YL |
1637 | int "MTRR cleanup enable value (0-1)" |
1638 | range 0 1 | |
1639 | default "0" | |
95ffa243 | 1640 | depends on MTRR_SANITIZER |
8f9ca475 | 1641 | ---help--- |
f5098d62 | 1642 | Enable mtrr cleanup default value |
95ffa243 | 1643 | |
12031a62 YL |
1644 | config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT |
1645 | int "MTRR cleanup spare reg num (0-7)" | |
1646 | range 0 7 | |
1647 | default "1" | |
1648 | depends on MTRR_SANITIZER | |
8f9ca475 | 1649 | ---help--- |
12031a62 | 1650 | mtrr cleanup spare entries default, it can be changed via |
aba3728c | 1651 | mtrr_spare_reg_nr=N on the kernel command line. |
12031a62 | 1652 | |
2e5d9c85 | 1653 | config X86_PAT |
6fc108a0 | 1654 | def_bool y |
6a108a14 | 1655 | prompt "x86 PAT support" if EXPERT |
2a8a2719 | 1656 | depends on MTRR |
8f9ca475 | 1657 | ---help--- |
2e5d9c85 | 1658 | Use PAT attributes to setup page level cache control. |
042b78e4 | 1659 | |
2e5d9c85 | 1660 | PATs are the modern equivalents of MTRRs and are much more |
1661 | flexible than MTRRs. | |
1662 | ||
1663 | Say N here if you see bootup problems (boot crash, boot hang, | |
042b78e4 | 1664 | spontaneous reboots) or a non-working video driver. |
2e5d9c85 | 1665 | |
1666 | If unsure, say Y. | |
1667 | ||
46cf98cd VP |
1668 | config ARCH_USES_PG_UNCACHED |
1669 | def_bool y | |
1670 | depends on X86_PAT | |
1671 | ||
628c6246 PA |
1672 | config ARCH_RANDOM |
1673 | def_bool y | |
1674 | prompt "x86 architectural random number generator" if EXPERT | |
1675 | ---help--- | |
1676 | Enable the x86 architectural RDRAND instruction | |
1677 | (Intel Bull Mountain technology) to generate random numbers. | |
1678 | If supported, this is a high bandwidth, cryptographically | |
1679 | secure hardware random number generator. | |
1680 | ||
51ae4a2d PA |
1681 | config X86_SMAP |
1682 | def_bool y | |
1683 | prompt "Supervisor Mode Access Prevention" if EXPERT | |
1684 | ---help--- | |
1685 | Supervisor Mode Access Prevention (SMAP) is a security | |
1686 | feature in newer Intel processors. There is a small | |
1687 | performance cost if this enabled and turned on; there is | |
1688 | also a small increase in the kernel size if this is enabled. | |
1689 | ||
1690 | If unsure, say Y. | |
1691 | ||
72e9b5fe DH |
1692 | config X86_INTEL_MPX |
1693 | prompt "Intel MPX (Memory Protection Extensions)" | |
1694 | def_bool n | |
1695 | depends on CPU_SUP_INTEL | |
1696 | ---help--- | |
1697 | MPX provides hardware features that can be used in | |
1698 | conjunction with compiler-instrumented code to check | |
1699 | memory references. It is designed to detect buffer | |
1700 | overflow or underflow bugs. | |
1701 | ||
1702 | This option enables running applications which are | |
1703 | instrumented or otherwise use MPX. It does not use MPX | |
1704 | itself inside the kernel or to protect the kernel | |
1705 | against bad memory references. | |
1706 | ||
1707 | Enabling this option will make the kernel larger: | |
1708 | ~8k of kernel text and 36 bytes of data on a 64-bit | |
1709 | defconfig. It adds a long to the 'mm_struct' which | |
1710 | will increase the kernel memory overhead of each | |
1711 | process and adds some branches to paths used during | |
1712 | exec() and munmap(). | |
1713 | ||
1714 | For details, see Documentation/x86/intel_mpx.txt | |
1715 | ||
1716 | If unsure, say N. | |
1717 | ||
35e97790 | 1718 | config X86_INTEL_MEMORY_PROTECTION_KEYS |
284244a9 | 1719 | prompt "Intel Memory Protection Keys" |
35e97790 | 1720 | def_bool y |
284244a9 | 1721 | # Note: only available in 64-bit mode |
35e97790 | 1722 | depends on CPU_SUP_INTEL && X86_64 |
284244a9 DH |
1723 | ---help--- |
1724 | Memory Protection Keys provides a mechanism for enforcing | |
1725 | page-based protections, but without requiring modification of the | |
1726 | page tables when an application changes protection domains. | |
1727 | ||
1728 | For details, see Documentation/x86/protection-keys.txt | |
1729 | ||
1730 | If unsure, say y. | |
35e97790 | 1731 | |
506f1d07 | 1732 | config EFI |
9ba16087 | 1733 | bool "EFI runtime service support" |
5b83683f | 1734 | depends on ACPI |
f6ce5002 | 1735 | select UCS2_STRING |
022ee6c5 | 1736 | select EFI_RUNTIME_WRAPPERS |
506f1d07 | 1737 | ---help--- |
8f9ca475 IM |
1738 | This enables the kernel to use EFI runtime services that are |
1739 | available (such as the EFI variable services). | |
506f1d07 | 1740 | |
8f9ca475 IM |
1741 | This option is only useful on systems that have EFI firmware. |
1742 | In addition, you should use the latest ELILO loader available | |
1743 | at <http://elilo.sourceforge.net> in order to take advantage | |
1744 | of EFI runtime services. However, even with this option, the | |
1745 | resultant kernel should continue to boot on existing non-EFI | |
1746 | platforms. | |
506f1d07 | 1747 | |
291f3632 MF |
1748 | config EFI_STUB |
1749 | bool "EFI stub support" | |
b16d8c23 | 1750 | depends on EFI && !X86_USE_3DNOW |
7b2a583a | 1751 | select RELOCATABLE |
291f3632 MF |
1752 | ---help--- |
1753 | This kernel feature allows a bzImage to be loaded directly | |
1754 | by EFI firmware without the use of a bootloader. | |
1755 | ||
4172fe2f | 1756 | See Documentation/efi-stub.txt for more information. |
0c759662 | 1757 | |
7d453eee MF |
1758 | config EFI_MIXED |
1759 | bool "EFI mixed-mode support" | |
1760 | depends on EFI_STUB && X86_64 | |
1761 | ---help--- | |
1762 | Enabling this feature allows a 64-bit kernel to be booted | |
1763 | on a 32-bit firmware, provided that your CPU supports 64-bit | |
1764 | mode. | |
1765 | ||
1766 | Note that it is not possible to boot a mixed-mode enabled | |
1767 | kernel via the EFI boot stub - a bootloader that supports | |
1768 | the EFI handover protocol must be used. | |
1769 | ||
1770 | If unsure, say N. | |
1771 | ||
506f1d07 | 1772 | config SECCOMP |
3c2362e6 HH |
1773 | def_bool y |
1774 | prompt "Enable seccomp to safely compute untrusted bytecode" | |
8f9ca475 | 1775 | ---help--- |
506f1d07 SR |
1776 | This kernel feature is useful for number crunching applications |
1777 | that may need to compute untrusted bytecode during their | |
1778 | execution. By using pipes or other transports made available to | |
1779 | the process as file descriptors supporting the read/write | |
1780 | syscalls, it's possible to isolate those applications in | |
1781 | their own address space using seccomp. Once seccomp is | |
9c0bbee8 | 1782 | enabled via prctl(PR_SET_SECCOMP), it cannot be disabled |
506f1d07 SR |
1783 | and the task is only allowed to execute a few safe syscalls |
1784 | defined by each seccomp mode. | |
1785 | ||
1786 | If unsure, say Y. Only embedded should say N here. | |
1787 | ||
506f1d07 SR |
1788 | source kernel/Kconfig.hz |
1789 | ||
1790 | config KEXEC | |
1791 | bool "kexec system call" | |
2965faa5 | 1792 | select KEXEC_CORE |
8f9ca475 | 1793 | ---help--- |
506f1d07 SR |
1794 | kexec is a system call that implements the ability to shutdown your |
1795 | current kernel, and to start another kernel. It is like a reboot | |
1796 | but it is independent of the system firmware. And like a reboot | |
1797 | you can start any kernel with it, not just Linux. | |
1798 | ||
1799 | The name comes from the similarity to the exec system call. | |
1800 | ||
1801 | It is an ongoing process to be certain the hardware in a machine | |
1802 | is properly shutdown, so do not be surprised if this code does not | |
bf220695 GU |
1803 | initially work for you. As of this writing the exact hardware |
1804 | interface is strongly in flux, so no good recommendation can be | |
1805 | made. | |
506f1d07 | 1806 | |
74ca317c VG |
1807 | config KEXEC_FILE |
1808 | bool "kexec file based system call" | |
2965faa5 | 1809 | select KEXEC_CORE |
74ca317c | 1810 | select BUILD_BIN2C |
74ca317c VG |
1811 | depends on X86_64 |
1812 | depends on CRYPTO=y | |
1813 | depends on CRYPTO_SHA256=y | |
1814 | ---help--- | |
1815 | This is new version of kexec system call. This system call is | |
1816 | file based and takes file descriptors as system call argument | |
1817 | for kernel and initramfs as opposed to list of segments as | |
1818 | accepted by previous system call. | |
1819 | ||
8e7d8381 VG |
1820 | config KEXEC_VERIFY_SIG |
1821 | bool "Verify kernel signature during kexec_file_load() syscall" | |
74ca317c | 1822 | depends on KEXEC_FILE |
8e7d8381 VG |
1823 | ---help--- |
1824 | This option makes kernel signature verification mandatory for | |
d8eb8940 BP |
1825 | the kexec_file_load() syscall. |
1826 | ||
1827 | In addition to that option, you need to enable signature | |
1828 | verification for the corresponding kernel image type being | |
1829 | loaded in order for this to work. | |
8e7d8381 VG |
1830 | |
1831 | config KEXEC_BZIMAGE_VERIFY_SIG | |
1832 | bool "Enable bzImage signature verification support" | |
1833 | depends on KEXEC_VERIFY_SIG | |
1834 | depends on SIGNED_PE_FILE_VERIFICATION | |
1835 | select SYSTEM_TRUSTED_KEYRING | |
1836 | ---help--- | |
1837 | Enable bzImage signature verification support. | |
1838 | ||
506f1d07 | 1839 | config CRASH_DUMP |
04b69447 | 1840 | bool "kernel crash dumps" |
506f1d07 | 1841 | depends on X86_64 || (X86_32 && HIGHMEM) |
8f9ca475 | 1842 | ---help--- |
506f1d07 SR |
1843 | Generate crash dump after being started by kexec. |
1844 | This should be normally only set in special crash dump kernels | |
1845 | which are loaded in the main kernel with kexec-tools into | |
1846 | a specially reserved region and then later executed after | |
1847 | a crash by kdump/kexec. The crash dump kernel must be compiled | |
1848 | to a memory address not used by the main kernel or BIOS using | |
1849 | PHYSICAL_START, or it must be built as a relocatable image | |
1850 | (CONFIG_RELOCATABLE=y). | |
1851 | For more details see Documentation/kdump/kdump.txt | |
1852 | ||
3ab83521 | 1853 | config KEXEC_JUMP |
6ea30386 | 1854 | bool "kexec jump" |
fee7b0d8 | 1855 | depends on KEXEC && HIBERNATION |
8f9ca475 | 1856 | ---help--- |
89081d17 HY |
1857 | Jump between original kernel and kexeced kernel and invoke |
1858 | code in physical address mode via KEXEC | |
3ab83521 | 1859 | |
506f1d07 | 1860 | config PHYSICAL_START |
6a108a14 | 1861 | hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP) |
ceefccc9 | 1862 | default "0x1000000" |
8f9ca475 | 1863 | ---help--- |
506f1d07 SR |
1864 | This gives the physical address where the kernel is loaded. |
1865 | ||
1866 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then | |
1867 | bzImage will decompress itself to above physical address and | |
1868 | run from there. Otherwise, bzImage will run from the address where | |
1869 | it has been loaded by the boot loader and will ignore above physical | |
1870 | address. | |
1871 | ||
1872 | In normal kdump cases one does not have to set/change this option | |
1873 | as now bzImage can be compiled as a completely relocatable image | |
1874 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different | |
1875 | address. This option is mainly useful for the folks who don't want | |
1876 | to use a bzImage for capturing the crash dump and want to use a | |
1877 | vmlinux instead. vmlinux is not relocatable hence a kernel needs | |
1878 | to be specifically compiled to run from a specific memory area | |
1879 | (normally a reserved region) and this option comes handy. | |
1880 | ||
ceefccc9 PA |
1881 | So if you are using bzImage for capturing the crash dump, |
1882 | leave the value here unchanged to 0x1000000 and set | |
1883 | CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux | |
1884 | for capturing the crash dump change this value to start of | |
1885 | the reserved region. In other words, it can be set based on | |
1886 | the "X" value as specified in the "crashkernel=YM@XM" | |
1887 | command line boot parameter passed to the panic-ed | |
1888 | kernel. Please take a look at Documentation/kdump/kdump.txt | |
1889 | for more details about crash dumps. | |
506f1d07 SR |
1890 | |
1891 | Usage of bzImage for capturing the crash dump is recommended as | |
1892 | one does not have to build two kernels. Same kernel can be used | |
1893 | as production kernel and capture kernel. Above option should have | |
1894 | gone away after relocatable bzImage support is introduced. But it | |
1895 | is present because there are users out there who continue to use | |
1896 | vmlinux for dump capture. This option should go away down the | |
1897 | line. | |
1898 | ||
1899 | Don't change this unless you know what you are doing. | |
1900 | ||
1901 | config RELOCATABLE | |
26717808 PA |
1902 | bool "Build a relocatable kernel" |
1903 | default y | |
8f9ca475 | 1904 | ---help--- |
506f1d07 SR |
1905 | This builds a kernel image that retains relocation information |
1906 | so it can be loaded someplace besides the default 1MB. | |
1907 | The relocations tend to make the kernel binary about 10% larger, | |
1908 | but are discarded at runtime. | |
1909 | ||
1910 | One use is for the kexec on panic case where the recovery kernel | |
1911 | must live at a different physical address than the primary | |
1912 | kernel. | |
1913 | ||
1914 | Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address | |
1915 | it has been loaded at and the compile time physical address | |
8ab3820f | 1916 | (CONFIG_PHYSICAL_START) is used as the minimum location. |
506f1d07 | 1917 | |
8ab3820f KC |
1918 | config RANDOMIZE_BASE |
1919 | bool "Randomize the address of the kernel image" | |
1920 | depends on RELOCATABLE | |
8ab3820f KC |
1921 | default n |
1922 | ---help--- | |
1923 | Randomizes the physical and virtual address at which the | |
1924 | kernel image is decompressed, as a security feature that | |
1925 | deters exploit attempts relying on knowledge of the location | |
1926 | of kernel internals. | |
1927 | ||
a653f356 KC |
1928 | Entropy is generated using the RDRAND instruction if it is |
1929 | supported. If RDTSC is supported, it is used as well. If | |
1930 | neither RDRAND nor RDTSC are supported, then randomness is | |
1931 | read from the i8254 timer. | |
8ab3820f KC |
1932 | |
1933 | The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET, | |
a653f356 KC |
1934 | and aligned according to PHYSICAL_ALIGN. Since the kernel is |
1935 | built using 2GiB addressing, and PHYSICAL_ALGIN must be at a | |
1936 | minimum of 2MiB, only 10 bits of entropy is theoretically | |
1937 | possible. At best, due to page table layouts, 64-bit can use | |
1938 | 9 bits of entropy and 32-bit uses 8 bits. | |
8ab3820f | 1939 | |
da2b6fb9 KC |
1940 | If unsure, say N. |
1941 | ||
8ab3820f | 1942 | config RANDOMIZE_BASE_MAX_OFFSET |
da2b6fb9 | 1943 | hex "Maximum kASLR offset allowed" if EXPERT |
8ab3820f | 1944 | depends on RANDOMIZE_BASE |
6145cfe3 KC |
1945 | range 0x0 0x20000000 if X86_32 |
1946 | default "0x20000000" if X86_32 | |
1947 | range 0x0 0x40000000 if X86_64 | |
1948 | default "0x40000000" if X86_64 | |
8ab3820f | 1949 | ---help--- |
da2b6fb9 KC |
1950 | The lesser of RANDOMIZE_BASE_MAX_OFFSET and available physical |
1951 | memory is used to determine the maximal offset in bytes that will | |
1952 | be applied to the kernel when kernel Address Space Layout | |
1953 | Randomization (kASLR) is active. This must be a multiple of | |
1954 | PHYSICAL_ALIGN. | |
1955 | ||
1956 | On 32-bit this is limited to 512MiB by page table layouts. The | |
1957 | default is 512MiB. | |
6145cfe3 | 1958 | |
da2b6fb9 KC |
1959 | On 64-bit this is limited by how the kernel fixmap page table is |
1960 | positioned, so this cannot be larger than 1GiB currently. Without | |
1961 | RANDOMIZE_BASE, there is a 512MiB to 1.5GiB split between kernel | |
1962 | and modules. When RANDOMIZE_BASE_MAX_OFFSET is above 512MiB, the | |
1963 | modules area will shrink to compensate, up to the current maximum | |
1964 | 1GiB to 1GiB split. The default is 1GiB. | |
6145cfe3 | 1965 | |
da2b6fb9 | 1966 | If unsure, leave at the default value. |
8ab3820f KC |
1967 | |
1968 | # Relocation on x86 needs some additional build support | |
845adf72 PA |
1969 | config X86_NEED_RELOCS |
1970 | def_bool y | |
8ab3820f | 1971 | depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE) |
845adf72 | 1972 | |
506f1d07 | 1973 | config PHYSICAL_ALIGN |
a0215061 | 1974 | hex "Alignment value to which kernel should be aligned" |
8ab3820f | 1975 | default "0x200000" |
a0215061 KC |
1976 | range 0x2000 0x1000000 if X86_32 |
1977 | range 0x200000 0x1000000 if X86_64 | |
8f9ca475 | 1978 | ---help--- |
506f1d07 SR |
1979 | This value puts the alignment restrictions on physical address |
1980 | where kernel is loaded and run from. Kernel is compiled for an | |
1981 | address which meets above alignment restriction. | |
1982 | ||
1983 | If bootloader loads the kernel at a non-aligned address and | |
1984 | CONFIG_RELOCATABLE is set, kernel will move itself to nearest | |
1985 | address aligned to above value and run from there. | |
1986 | ||
1987 | If bootloader loads the kernel at a non-aligned address and | |
1988 | CONFIG_RELOCATABLE is not set, kernel will ignore the run time | |
1989 | load address and decompress itself to the address it has been | |
1990 | compiled for and run from there. The address for which kernel is | |
1991 | compiled already meets above alignment restrictions. Hence the | |
1992 | end result is that kernel runs from a physical address meeting | |
1993 | above alignment restrictions. | |
1994 | ||
a0215061 KC |
1995 | On 32-bit this value must be a multiple of 0x2000. On 64-bit |
1996 | this value must be a multiple of 0x200000. | |
1997 | ||
506f1d07 SR |
1998 | Don't change this unless you know what you are doing. |
1999 | ||
2000 | config HOTPLUG_CPU | |
7c13e6a3 | 2001 | bool "Support for hot-pluggable CPUs" |
40b31360 | 2002 | depends on SMP |
506f1d07 | 2003 | ---help--- |
7c13e6a3 DS |
2004 | Say Y here to allow turning CPUs off and on. CPUs can be |
2005 | controlled through /sys/devices/system/cpu. | |
2006 | ( Note: power management support will enable this option | |
2007 | automatically on SMP systems. ) | |
2008 | Say N if you want to disable CPU hotplug. | |
506f1d07 | 2009 | |
80aa1dff FY |
2010 | config BOOTPARAM_HOTPLUG_CPU0 |
2011 | bool "Set default setting of cpu0_hotpluggable" | |
2012 | default n | |
2c922cd0 | 2013 | depends on HOTPLUG_CPU |
80aa1dff FY |
2014 | ---help--- |
2015 | Set whether default state of cpu0_hotpluggable is on or off. | |
2016 | ||
2017 | Say Y here to enable CPU0 hotplug by default. If this switch | |
2018 | is turned on, there is no need to give cpu0_hotplug kernel | |
2019 | parameter and the CPU0 hotplug feature is enabled by default. | |
2020 | ||
2021 | Please note: there are two known CPU0 dependencies if you want | |
2022 | to enable the CPU0 hotplug feature either by this switch or by | |
2023 | cpu0_hotplug kernel parameter. | |
2024 | ||
2025 | First, resume from hibernate or suspend always starts from CPU0. | |
2026 | So hibernate and suspend are prevented if CPU0 is offline. | |
2027 | ||
2028 | Second dependency is PIC interrupts always go to CPU0. CPU0 can not | |
2029 | offline if any interrupt can not migrate out of CPU0. There may | |
2030 | be other CPU0 dependencies. | |
2031 | ||
2032 | Please make sure the dependencies are under your control before | |
2033 | you enable this feature. | |
2034 | ||
2035 | Say N if you don't want to enable CPU0 hotplug feature by default. | |
2036 | You still can enable the CPU0 hotplug feature at boot by kernel | |
2037 | parameter cpu0_hotplug. | |
2038 | ||
a71c8bc5 FY |
2039 | config DEBUG_HOTPLUG_CPU0 |
2040 | def_bool n | |
2041 | prompt "Debug CPU0 hotplug" | |
2c922cd0 | 2042 | depends on HOTPLUG_CPU |
a71c8bc5 FY |
2043 | ---help--- |
2044 | Enabling this option offlines CPU0 (if CPU0 can be offlined) as | |
2045 | soon as possible and boots up userspace with CPU0 offlined. User | |
2046 | can online CPU0 back after boot time. | |
2047 | ||
2048 | To debug CPU0 hotplug, you need to enable CPU0 offline/online | |
2049 | feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during | |
2050 | compilation or giving cpu0_hotplug kernel parameter at boot. | |
2051 | ||
2052 | If unsure, say N. | |
2053 | ||
506f1d07 | 2054 | config COMPAT_VDSO |
b0b49f26 AL |
2055 | def_bool n |
2056 | prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)" | |
af65d648 | 2057 | depends on X86_32 || IA32_EMULATION |
8f9ca475 | 2058 | ---help--- |
b0b49f26 AL |
2059 | Certain buggy versions of glibc will crash if they are |
2060 | presented with a 32-bit vDSO that is not mapped at the address | |
2061 | indicated in its segment table. | |
e84446de | 2062 | |
b0b49f26 AL |
2063 | The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a |
2064 | and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and | |
2065 | 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is | |
2066 | the only released version with the bug, but OpenSUSE 9 | |
2067 | contains a buggy "glibc 2.3.2". | |
506f1d07 | 2068 | |
b0b49f26 AL |
2069 | The symptom of the bug is that everything crashes on startup, saying: |
2070 | dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed! | |
2071 | ||
2072 | Saying Y here changes the default value of the vdso32 boot | |
2073 | option from 1 to 0, which turns off the 32-bit vDSO entirely. | |
2074 | This works around the glibc bug but hurts performance. | |
2075 | ||
2076 | If unsure, say N: if you are compiling your own kernel, you | |
2077 | are unlikely to be using a buggy version of glibc. | |
506f1d07 | 2078 | |
3dc33bd3 KC |
2079 | choice |
2080 | prompt "vsyscall table for legacy applications" | |
2081 | depends on X86_64 | |
2082 | default LEGACY_VSYSCALL_EMULATE | |
2083 | help | |
2084 | Legacy user code that does not know how to find the vDSO expects | |
2085 | to be able to issue three syscalls by calling fixed addresses in | |
2086 | kernel space. Since this location is not randomized with ASLR, | |
2087 | it can be used to assist security vulnerability exploitation. | |
2088 | ||
2089 | This setting can be changed at boot time via the kernel command | |
2090 | line parameter vsyscall=[native|emulate|none]. | |
2091 | ||
2092 | On a system with recent enough glibc (2.14 or newer) and no | |
2093 | static binaries, you can say None without a performance penalty | |
2094 | to improve security. | |
2095 | ||
2096 | If unsure, select "Emulate". | |
2097 | ||
2098 | config LEGACY_VSYSCALL_NATIVE | |
2099 | bool "Native" | |
2100 | help | |
2101 | Actual executable code is located in the fixed vsyscall | |
2102 | address mapping, implementing time() efficiently. Since | |
2103 | this makes the mapping executable, it can be used during | |
2104 | security vulnerability exploitation (traditionally as | |
2105 | ROP gadgets). This configuration is not recommended. | |
2106 | ||
2107 | config LEGACY_VSYSCALL_EMULATE | |
2108 | bool "Emulate" | |
2109 | help | |
2110 | The kernel traps and emulates calls into the fixed | |
2111 | vsyscall address mapping. This makes the mapping | |
2112 | non-executable, but it still contains known contents, | |
2113 | which could be used in certain rare security vulnerability | |
2114 | exploits. This configuration is recommended when userspace | |
2115 | still uses the vsyscall area. | |
2116 | ||
2117 | config LEGACY_VSYSCALL_NONE | |
2118 | bool "None" | |
2119 | help | |
2120 | There will be no vsyscall mapping at all. This will | |
2121 | eliminate any risk of ASLR bypass due to the vsyscall | |
2122 | fixed address mapping. Attempts to use the vsyscalls | |
2123 | will be reported to dmesg, so that either old or | |
2124 | malicious userspace programs can be identified. | |
2125 | ||
2126 | endchoice | |
2127 | ||
516cbf37 TB |
2128 | config CMDLINE_BOOL |
2129 | bool "Built-in kernel command line" | |
8f9ca475 | 2130 | ---help--- |
516cbf37 TB |
2131 | Allow for specifying boot arguments to the kernel at |
2132 | build time. On some systems (e.g. embedded ones), it is | |
2133 | necessary or convenient to provide some or all of the | |
2134 | kernel boot arguments with the kernel itself (that is, | |
2135 | to not rely on the boot loader to provide them.) | |
2136 | ||
2137 | To compile command line arguments into the kernel, | |
2138 | set this option to 'Y', then fill in the | |
69711ca1 | 2139 | boot arguments in CONFIG_CMDLINE. |
516cbf37 TB |
2140 | |
2141 | Systems with fully functional boot loaders (i.e. non-embedded) | |
2142 | should leave this option set to 'N'. | |
2143 | ||
2144 | config CMDLINE | |
2145 | string "Built-in kernel command string" | |
2146 | depends on CMDLINE_BOOL | |
2147 | default "" | |
8f9ca475 | 2148 | ---help--- |
516cbf37 TB |
2149 | Enter arguments here that should be compiled into the kernel |
2150 | image and used at boot time. If the boot loader provides a | |
2151 | command line at boot time, it is appended to this string to | |
2152 | form the full kernel command line, when the system boots. | |
2153 | ||
2154 | However, you can use the CONFIG_CMDLINE_OVERRIDE option to | |
2155 | change this behavior. | |
2156 | ||
2157 | In most cases, the command line (whether built-in or provided | |
2158 | by the boot loader) should specify the device for the root | |
2159 | file system. | |
2160 | ||
2161 | config CMDLINE_OVERRIDE | |
2162 | bool "Built-in command line overrides boot loader arguments" | |
516cbf37 | 2163 | depends on CMDLINE_BOOL |
8f9ca475 | 2164 | ---help--- |
516cbf37 TB |
2165 | Set this option to 'Y' to have the kernel ignore the boot loader |
2166 | command line, and use ONLY the built-in command line. | |
2167 | ||
2168 | This is used to work around broken boot loaders. This should | |
2169 | be set to 'N' under normal conditions. | |
2170 | ||
a5b9e5a2 AL |
2171 | config MODIFY_LDT_SYSCALL |
2172 | bool "Enable the LDT (local descriptor table)" if EXPERT | |
2173 | default y | |
2174 | ---help--- | |
2175 | Linux can allow user programs to install a per-process x86 | |
2176 | Local Descriptor Table (LDT) using the modify_ldt(2) system | |
2177 | call. This is required to run 16-bit or segmented code such as | |
2178 | DOSEMU or some Wine programs. It is also used by some very old | |
2179 | threading libraries. | |
2180 | ||
2181 | Enabling this feature adds a small amount of overhead to | |
2182 | context switches and increases the low-level kernel attack | |
2183 | surface. Disabling it removes the modify_ldt(2) system call. | |
2184 | ||
2185 | Saying 'N' here may make sense for embedded or server kernels. | |
2186 | ||
b700e7f0 SJ |
2187 | source "kernel/livepatch/Kconfig" |
2188 | ||
506f1d07 SR |
2189 | endmenu |
2190 | ||
2191 | config ARCH_ENABLE_MEMORY_HOTPLUG | |
2192 | def_bool y | |
2193 | depends on X86_64 || (X86_32 && HIGHMEM) | |
2194 | ||
35551053 GH |
2195 | config ARCH_ENABLE_MEMORY_HOTREMOVE |
2196 | def_bool y | |
2197 | depends on MEMORY_HOTPLUG | |
2198 | ||
e534c7c5 | 2199 | config USE_PERCPU_NUMA_NODE_ID |
645a7919 | 2200 | def_bool y |
e534c7c5 LS |
2201 | depends on NUMA |
2202 | ||
9491846f KS |
2203 | config ARCH_ENABLE_SPLIT_PMD_PTLOCK |
2204 | def_bool y | |
2205 | depends on X86_64 || X86_PAE | |
2206 | ||
c177c81e NH |
2207 | config ARCH_ENABLE_HUGEPAGE_MIGRATION |
2208 | def_bool y | |
2209 | depends on X86_64 && HUGETLB_PAGE && MIGRATION | |
2210 | ||
da85f865 | 2211 | menu "Power management and ACPI options" |
e279b6c1 SR |
2212 | |
2213 | config ARCH_HIBERNATION_HEADER | |
3c2362e6 | 2214 | def_bool y |
e279b6c1 | 2215 | depends on X86_64 && HIBERNATION |
e279b6c1 SR |
2216 | |
2217 | source "kernel/power/Kconfig" | |
2218 | ||
2219 | source "drivers/acpi/Kconfig" | |
2220 | ||
efafc8b2 FT |
2221 | source "drivers/sfi/Kconfig" |
2222 | ||
a6b68076 | 2223 | config X86_APM_BOOT |
6fc108a0 | 2224 | def_bool y |
282e5aab | 2225 | depends on APM |
a6b68076 | 2226 | |
e279b6c1 SR |
2227 | menuconfig APM |
2228 | tristate "APM (Advanced Power Management) BIOS support" | |
efefa6f6 | 2229 | depends on X86_32 && PM_SLEEP |
e279b6c1 SR |
2230 | ---help--- |
2231 | APM is a BIOS specification for saving power using several different | |
2232 | techniques. This is mostly useful for battery powered laptops with | |
2233 | APM compliant BIOSes. If you say Y here, the system time will be | |
2234 | reset after a RESUME operation, the /proc/apm device will provide | |
2235 | battery status information, and user-space programs will receive | |
2236 | notification of APM "events" (e.g. battery status change). | |
2237 | ||
2238 | If you select "Y" here, you can disable actual use of the APM | |
2239 | BIOS by passing the "apm=off" option to the kernel at boot time. | |
2240 | ||
2241 | Note that the APM support is almost completely disabled for | |
2242 | machines with more than one CPU. | |
2243 | ||
2244 | In order to use APM, you will need supporting software. For location | |
2dc98fd3 MW |
2245 | and more information, read <file:Documentation/power/apm-acpi.txt> |
2246 | and the Battery Powered Linux mini-HOWTO, available from | |
e279b6c1 SR |
2247 | <http://www.tldp.org/docs.html#howto>. |
2248 | ||
2249 | This driver does not spin down disk drives (see the hdparm(8) | |
2250 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
2251 | VESA-compliant "green" monitors. | |
2252 | ||
2253 | This driver does not support the TI 4000M TravelMate and the ACER | |
2254 | 486/DX4/75 because they don't have compliant BIOSes. Many "green" | |
2255 | desktop machines also don't have compliant BIOSes, and this driver | |
2256 | may cause those machines to panic during the boot phase. | |
2257 | ||
2258 | Generally, if you don't have a battery in your machine, there isn't | |
2259 | much point in using this driver and you should say N. If you get | |
2260 | random kernel OOPSes or reboots that don't seem to be related to | |
2261 | anything, try disabling/enabling this option (or disabling/enabling | |
2262 | APM in your BIOS). | |
2263 | ||
2264 | Some other things you should try when experiencing seemingly random, | |
2265 | "weird" problems: | |
2266 | ||
2267 | 1) make sure that you have enough swap space and that it is | |
2268 | enabled. | |
2269 | 2) pass the "no-hlt" option to the kernel | |
2270 | 3) switch on floating point emulation in the kernel and pass | |
2271 | the "no387" option to the kernel | |
2272 | 4) pass the "floppy=nodma" option to the kernel | |
2273 | 5) pass the "mem=4M" option to the kernel (thereby disabling | |
2274 | all but the first 4 MB of RAM) | |
2275 | 6) make sure that the CPU is not over clocked. | |
2276 | 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> | |
2277 | 8) disable the cache from your BIOS settings | |
2278 | 9) install a fan for the video card or exchange video RAM | |
2279 | 10) install a better fan for the CPU | |
2280 | 11) exchange RAM chips | |
2281 | 12) exchange the motherboard. | |
2282 | ||
2283 | To compile this driver as a module, choose M here: the | |
2284 | module will be called apm. | |
2285 | ||
2286 | if APM | |
2287 | ||
2288 | config APM_IGNORE_USER_SUSPEND | |
2289 | bool "Ignore USER SUSPEND" | |
8f9ca475 | 2290 | ---help--- |
e279b6c1 SR |
2291 | This option will ignore USER SUSPEND requests. On machines with a |
2292 | compliant APM BIOS, you want to say N. However, on the NEC Versa M | |
2293 | series notebooks, it is necessary to say Y because of a BIOS bug. | |
2294 | ||
2295 | config APM_DO_ENABLE | |
2296 | bool "Enable PM at boot time" | |
2297 | ---help--- | |
2298 | Enable APM features at boot time. From page 36 of the APM BIOS | |
2299 | specification: "When disabled, the APM BIOS does not automatically | |
2300 | power manage devices, enter the Standby State, enter the Suspend | |
2301 | State, or take power saving steps in response to CPU Idle calls." | |
2302 | This driver will make CPU Idle calls when Linux is idle (unless this | |
2303 | feature is turned off -- see "Do CPU IDLE calls", below). This | |
2304 | should always save battery power, but more complicated APM features | |
2305 | will be dependent on your BIOS implementation. You may need to turn | |
2306 | this option off if your computer hangs at boot time when using APM | |
2307 | support, or if it beeps continuously instead of suspending. Turn | |
2308 | this off if you have a NEC UltraLite Versa 33/C or a Toshiba | |
2309 | T400CDT. This is off by default since most machines do fine without | |
2310 | this feature. | |
2311 | ||
2312 | config APM_CPU_IDLE | |
dd8af076 | 2313 | depends on CPU_IDLE |
e279b6c1 | 2314 | bool "Make CPU Idle calls when idle" |
8f9ca475 | 2315 | ---help--- |
e279b6c1 SR |
2316 | Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. |
2317 | On some machines, this can activate improved power savings, such as | |
2318 | a slowed CPU clock rate, when the machine is idle. These idle calls | |
2319 | are made after the idle loop has run for some length of time (e.g., | |
2320 | 333 mS). On some machines, this will cause a hang at boot time or | |
2321 | whenever the CPU becomes idle. (On machines with more than one CPU, | |
2322 | this option does nothing.) | |
2323 | ||
2324 | config APM_DISPLAY_BLANK | |
2325 | bool "Enable console blanking using APM" | |
8f9ca475 | 2326 | ---help--- |
e279b6c1 SR |
2327 | Enable console blanking using the APM. Some laptops can use this to |
2328 | turn off the LCD backlight when the screen blanker of the Linux | |
2329 | virtual console blanks the screen. Note that this is only used by | |
2330 | the virtual console screen blanker, and won't turn off the backlight | |
2331 | when using the X Window system. This also doesn't have anything to | |
2332 | do with your VESA-compliant power-saving monitor. Further, this | |
2333 | option doesn't work for all laptops -- it might not turn off your | |
2334 | backlight at all, or it might print a lot of errors to the console, | |
2335 | especially if you are using gpm. | |
2336 | ||
2337 | config APM_ALLOW_INTS | |
2338 | bool "Allow interrupts during APM BIOS calls" | |
8f9ca475 | 2339 | ---help--- |
e279b6c1 SR |
2340 | Normally we disable external interrupts while we are making calls to |
2341 | the APM BIOS as a measure to lessen the effects of a badly behaving | |
2342 | BIOS implementation. The BIOS should reenable interrupts if it | |
2343 | needs to. Unfortunately, some BIOSes do not -- especially those in | |
2344 | many of the newer IBM Thinkpads. If you experience hangs when you | |
2345 | suspend, try setting this to Y. Otherwise, say N. | |
2346 | ||
e279b6c1 SR |
2347 | endif # APM |
2348 | ||
bb0a56ec | 2349 | source "drivers/cpufreq/Kconfig" |
e279b6c1 SR |
2350 | |
2351 | source "drivers/cpuidle/Kconfig" | |
2352 | ||
27471fdb AH |
2353 | source "drivers/idle/Kconfig" |
2354 | ||
e279b6c1 SR |
2355 | endmenu |
2356 | ||
2357 | ||
2358 | menu "Bus options (PCI etc.)" | |
2359 | ||
2360 | config PCI | |
1ac97018 | 2361 | bool "PCI support" |
1c858087 | 2362 | default y |
8f9ca475 | 2363 | ---help--- |
e279b6c1 SR |
2364 | Find out whether you have a PCI motherboard. PCI is the name of a |
2365 | bus system, i.e. the way the CPU talks to the other stuff inside | |
2366 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | |
2367 | VESA. If you have PCI, say Y, otherwise N. | |
2368 | ||
e279b6c1 SR |
2369 | choice |
2370 | prompt "PCI access mode" | |
efefa6f6 | 2371 | depends on X86_32 && PCI |
e279b6c1 SR |
2372 | default PCI_GOANY |
2373 | ---help--- | |
2374 | On PCI systems, the BIOS can be used to detect the PCI devices and | |
2375 | determine their configuration. However, some old PCI motherboards | |
2376 | have BIOS bugs and may crash if this is done. Also, some embedded | |
2377 | PCI-based systems don't have any BIOS at all. Linux can also try to | |
2378 | detect the PCI hardware directly without using the BIOS. | |
2379 | ||
2380 | With this option, you can specify how Linux should detect the | |
2381 | PCI devices. If you choose "BIOS", the BIOS will be used, | |
2382 | if you choose "Direct", the BIOS won't be used, and if you | |
2383 | choose "MMConfig", then PCI Express MMCONFIG will be used. | |
2384 | If you choose "Any", the kernel will try MMCONFIG, then the | |
2385 | direct access method and falls back to the BIOS if that doesn't | |
2386 | work. If unsure, go with the default, which is "Any". | |
2387 | ||
2388 | config PCI_GOBIOS | |
2389 | bool "BIOS" | |
2390 | ||
2391 | config PCI_GOMMCONFIG | |
2392 | bool "MMConfig" | |
2393 | ||
2394 | config PCI_GODIRECT | |
2395 | bool "Direct" | |
2396 | ||
3ef0e1f8 | 2397 | config PCI_GOOLPC |
76fb6570 | 2398 | bool "OLPC XO-1" |
3ef0e1f8 AS |
2399 | depends on OLPC |
2400 | ||
2bdd1b03 AS |
2401 | config PCI_GOANY |
2402 | bool "Any" | |
2403 | ||
e279b6c1 SR |
2404 | endchoice |
2405 | ||
2406 | config PCI_BIOS | |
3c2362e6 | 2407 | def_bool y |
efefa6f6 | 2408 | depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY) |
e279b6c1 SR |
2409 | |
2410 | # x86-64 doesn't support PCI BIOS access from long mode so always go direct. | |
2411 | config PCI_DIRECT | |
3c2362e6 | 2412 | def_bool y |
0aba496f | 2413 | depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG)) |
e279b6c1 SR |
2414 | |
2415 | config PCI_MMCONFIG | |
3c2362e6 | 2416 | def_bool y |
5f0db7a2 | 2417 | depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY) |
e279b6c1 | 2418 | |
3ef0e1f8 | 2419 | config PCI_OLPC |
2bdd1b03 AS |
2420 | def_bool y |
2421 | depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY) | |
3ef0e1f8 | 2422 | |
b5401a96 AN |
2423 | config PCI_XEN |
2424 | def_bool y | |
2425 | depends on PCI && XEN | |
2426 | select SWIOTLB_XEN | |
2427 | ||
e279b6c1 | 2428 | config PCI_DOMAINS |
3c2362e6 | 2429 | def_bool y |
e279b6c1 | 2430 | depends on PCI |
e279b6c1 SR |
2431 | |
2432 | config PCI_MMCONFIG | |
2433 | bool "Support mmconfig PCI config space access" | |
2434 | depends on X86_64 && PCI && ACPI | |
2435 | ||
3f6ea84a | 2436 | config PCI_CNB20LE_QUIRK |
6a108a14 | 2437 | bool "Read CNB20LE Host Bridge Windows" if EXPERT |
6ea30386 | 2438 | depends on PCI |
3f6ea84a IS |
2439 | help |
2440 | Read the PCI windows out of the CNB20LE host bridge. This allows | |
2441 | PCI hotplug to work on systems with the CNB20LE chipset which do | |
2442 | not have ACPI. | |
2443 | ||
64a5fed6 BH |
2444 | There's no public spec for this chipset, and this functionality |
2445 | is known to be incomplete. | |
2446 | ||
2447 | You should say N unless you know you need this. | |
2448 | ||
e279b6c1 SR |
2449 | source "drivers/pci/pcie/Kconfig" |
2450 | ||
2451 | source "drivers/pci/Kconfig" | |
2452 | ||
1c00f016 | 2453 | # x86_64 have no ISA slots, but can have ISA-style DMA. |
e279b6c1 | 2454 | config ISA_DMA_API |
1c00f016 DR |
2455 | bool "ISA-style DMA support" if (X86_64 && EXPERT) |
2456 | default y | |
2457 | help | |
2458 | Enables ISA-style DMA support for devices requiring such controllers. | |
2459 | If unsure, say Y. | |
e279b6c1 SR |
2460 | |
2461 | if X86_32 | |
2462 | ||
2463 | config ISA | |
2464 | bool "ISA support" | |
8f9ca475 | 2465 | ---help--- |
e279b6c1 SR |
2466 | Find out whether you have ISA slots on your motherboard. ISA is the |
2467 | name of a bus system, i.e. the way the CPU talks to the other stuff | |
2468 | inside your box. Other bus systems are PCI, EISA, MicroChannel | |
2469 | (MCA) or VESA. ISA is an older system, now being displaced by PCI; | |
2470 | newer boards don't support it. If you have ISA, say Y, otherwise N. | |
2471 | ||
2472 | config EISA | |
2473 | bool "EISA support" | |
2474 | depends on ISA | |
2475 | ---help--- | |
2476 | The Extended Industry Standard Architecture (EISA) bus was | |
2477 | developed as an open alternative to the IBM MicroChannel bus. | |
2478 | ||
2479 | The EISA bus provided some of the features of the IBM MicroChannel | |
2480 | bus while maintaining backward compatibility with cards made for | |
2481 | the older ISA bus. The EISA bus saw limited use between 1988 and | |
2482 | 1995 when it was made obsolete by the PCI bus. | |
2483 | ||
2484 | Say Y here if you are building a kernel for an EISA-based machine. | |
2485 | ||
2486 | Otherwise, say N. | |
2487 | ||
2488 | source "drivers/eisa/Kconfig" | |
2489 | ||
e279b6c1 SR |
2490 | config SCx200 |
2491 | tristate "NatSemi SCx200 support" | |
8f9ca475 | 2492 | ---help--- |
e279b6c1 SR |
2493 | This provides basic support for National Semiconductor's |
2494 | (now AMD's) Geode processors. The driver probes for the | |
2495 | PCI-IDs of several on-chip devices, so its a good dependency | |
2496 | for other scx200_* drivers. | |
2497 | ||
2498 | If compiled as a module, the driver is named scx200. | |
2499 | ||
2500 | config SCx200HR_TIMER | |
2501 | tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" | |
592913ec | 2502 | depends on SCx200 |
e279b6c1 | 2503 | default y |
8f9ca475 | 2504 | ---help--- |
e279b6c1 SR |
2505 | This driver provides a clocksource built upon the on-chip |
2506 | 27MHz high-resolution timer. Its also a workaround for | |
2507 | NSC Geode SC-1100's buggy TSC, which loses time when the | |
2508 | processor goes idle (as is done by the scheduler). The | |
2509 | other workaround is idle=poll boot option. | |
2510 | ||
3ef0e1f8 AS |
2511 | config OLPC |
2512 | bool "One Laptop Per Child support" | |
54008979 | 2513 | depends on !X86_PAE |
3c554946 | 2514 | select GPIOLIB |
dc3119e7 | 2515 | select OF |
45bb1674 | 2516 | select OF_PROMTREE |
b4e51854 | 2517 | select IRQ_DOMAIN |
8f9ca475 | 2518 | ---help--- |
3ef0e1f8 AS |
2519 | Add support for detecting the unique features of the OLPC |
2520 | XO hardware. | |
2521 | ||
a3128588 DD |
2522 | config OLPC_XO1_PM |
2523 | bool "OLPC XO-1 Power Management" | |
97c4cb71 | 2524 | depends on OLPC && MFD_CS5535 && PM_SLEEP |
a3128588 | 2525 | select MFD_CORE |
bf1ebf00 | 2526 | ---help--- |
97c4cb71 | 2527 | Add support for poweroff and suspend of the OLPC XO-1 laptop. |
bf1ebf00 | 2528 | |
cfee9597 DD |
2529 | config OLPC_XO1_RTC |
2530 | bool "OLPC XO-1 Real Time Clock" | |
2531 | depends on OLPC_XO1_PM && RTC_DRV_CMOS | |
2532 | ---help--- | |
2533 | Add support for the XO-1 real time clock, which can be used as a | |
2534 | programmable wakeup source. | |
2535 | ||
7feda8e9 DD |
2536 | config OLPC_XO1_SCI |
2537 | bool "OLPC XO-1 SCI extras" | |
d8d01a63 | 2538 | depends on OLPC && OLPC_XO1_PM |
ed8e47fe | 2539 | depends on INPUT=y |
d8d01a63 | 2540 | select POWER_SUPPLY |
7feda8e9 DD |
2541 | select GPIO_CS5535 |
2542 | select MFD_CORE | |
2543 | ---help--- | |
2544 | Add support for SCI-based features of the OLPC XO-1 laptop: | |
7bc74b3d | 2545 | - EC-driven system wakeups |
7feda8e9 | 2546 | - Power button |
7bc74b3d | 2547 | - Ebook switch |
2cf2baea | 2548 | - Lid switch |
e1040ac6 DD |
2549 | - AC adapter status updates |
2550 | - Battery status updates | |
7feda8e9 | 2551 | |
a0f30f59 DD |
2552 | config OLPC_XO15_SCI |
2553 | bool "OLPC XO-1.5 SCI extras" | |
d8d01a63 DD |
2554 | depends on OLPC && ACPI |
2555 | select POWER_SUPPLY | |
a0f30f59 DD |
2556 | ---help--- |
2557 | Add support for SCI-based features of the OLPC XO-1.5 laptop: | |
2558 | - EC-driven system wakeups | |
2559 | - AC adapter status updates | |
2560 | - Battery status updates | |
bf1ebf00 | 2561 | |
d4f3e350 EW |
2562 | config ALIX |
2563 | bool "PCEngines ALIX System Support (LED setup)" | |
2564 | select GPIOLIB | |
2565 | ---help--- | |
2566 | This option enables system support for the PCEngines ALIX. | |
2567 | At present this just sets up LEDs for GPIO control on | |
2568 | ALIX2/3/6 boards. However, other system specific setup should | |
2569 | get added here. | |
2570 | ||
2571 | Note: You must still enable the drivers for GPIO and LED support | |
2572 | (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs | |
2573 | ||
2574 | Note: You have to set alix.force=1 for boards with Award BIOS. | |
2575 | ||
da4e3302 PP |
2576 | config NET5501 |
2577 | bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)" | |
2578 | select GPIOLIB | |
2579 | ---help--- | |
2580 | This option enables system support for the Soekris Engineering net5501. | |
2581 | ||
3197059a PP |
2582 | config GEOS |
2583 | bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)" | |
2584 | select GPIOLIB | |
2585 | depends on DMI | |
2586 | ---help--- | |
2587 | This option enables system support for the Traverse Technologies GEOS. | |
2588 | ||
7d029125 VD |
2589 | config TS5500 |
2590 | bool "Technologic Systems TS-5500 platform support" | |
2591 | depends on MELAN | |
2592 | select CHECK_SIGNATURE | |
2593 | select NEW_LEDS | |
2594 | select LEDS_CLASS | |
2595 | ---help--- | |
2596 | This option enables system support for the Technologic Systems TS-5500. | |
2597 | ||
bc0120fd SR |
2598 | endif # X86_32 |
2599 | ||
23ac4ae8 | 2600 | config AMD_NB |
e279b6c1 | 2601 | def_bool y |
0e152cd7 | 2602 | depends on CPU_SUP_AMD && PCI |
e279b6c1 SR |
2603 | |
2604 | source "drivers/pcmcia/Kconfig" | |
2605 | ||
2606 | source "drivers/pci/hotplug/Kconfig" | |
2607 | ||
388b78ad | 2608 | config RAPIDIO |
fdf90abc | 2609 | tristate "RapidIO support" |
388b78ad AB |
2610 | depends on PCI |
2611 | default n | |
2612 | help | |
fdf90abc | 2613 | If enabled this option will include drivers and the core |
388b78ad AB |
2614 | infrastructure code to support RapidIO interconnect devices. |
2615 | ||
2616 | source "drivers/rapidio/Kconfig" | |
2617 | ||
e3263ab3 DH |
2618 | config X86_SYSFB |
2619 | bool "Mark VGA/VBE/EFI FB as generic system framebuffer" | |
2620 | help | |
2621 | Firmwares often provide initial graphics framebuffers so the BIOS, | |
2622 | bootloader or kernel can show basic video-output during boot for | |
2623 | user-guidance and debugging. Historically, x86 used the VESA BIOS | |
2624 | Extensions and EFI-framebuffers for this, which are mostly limited | |
2625 | to x86. | |
2626 | This option, if enabled, marks VGA/VBE/EFI framebuffers as generic | |
2627 | framebuffers so the new generic system-framebuffer drivers can be | |
2628 | used on x86. If the framebuffer is not compatible with the generic | |
2629 | modes, it is adverticed as fallback platform framebuffer so legacy | |
2630 | drivers like efifb, vesafb and uvesafb can pick it up. | |
2631 | If this option is not selected, all system framebuffers are always | |
2632 | marked as fallback platform framebuffers as usual. | |
2633 | ||
2634 | Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will | |
2635 | not be able to pick up generic system framebuffers if this option | |
2636 | is selected. You are highly encouraged to enable simplefb as | |
2637 | replacement if you select this option. simplefb can correctly deal | |
2638 | with generic system framebuffers. But you should still keep vesafb | |
2639 | and others enabled as fallback if a system framebuffer is | |
2640 | incompatible with simplefb. | |
2641 | ||
2642 | If unsure, say Y. | |
2643 | ||
e279b6c1 SR |
2644 | endmenu |
2645 | ||
2646 | ||
2647 | menu "Executable file formats / Emulations" | |
2648 | ||
2649 | source "fs/Kconfig.binfmt" | |
2650 | ||
2651 | config IA32_EMULATION | |
2652 | bool "IA32 Emulation" | |
2653 | depends on X86_64 | |
d1603990 | 2654 | select BINFMT_ELF |
a97f52e6 | 2655 | select COMPAT_BINFMT_ELF |
3bead553 | 2656 | select ARCH_WANT_OLD_COMPAT_IPC |
8f9ca475 | 2657 | ---help--- |
5fd92e65 L |
2658 | Include code to run legacy 32-bit programs under a |
2659 | 64-bit kernel. You should likely turn this on, unless you're | |
2660 | 100% sure that you don't have any 32-bit programs left. | |
e279b6c1 SR |
2661 | |
2662 | config IA32_AOUT | |
8f9ca475 IM |
2663 | tristate "IA32 a.out support" |
2664 | depends on IA32_EMULATION | |
2665 | ---help--- | |
2666 | Support old a.out binaries in the 32bit emulation. | |
e279b6c1 | 2667 | |
0bf62763 | 2668 | config X86_X32 |
6ea30386 | 2669 | bool "x32 ABI for 64-bit mode" |
9b54050b | 2670 | depends on X86_64 |
5fd92e65 L |
2671 | ---help--- |
2672 | Include code to run binaries for the x32 native 32-bit ABI | |
2673 | for 64-bit processors. An x32 process gets access to the | |
2674 | full 64-bit register file and wide data path while leaving | |
2675 | pointers at 32 bits for smaller memory footprint. | |
2676 | ||
2677 | You will need a recent binutils (2.22 or later) with | |
2678 | elf32_x86_64 support enabled to compile a kernel with this | |
2679 | option set. | |
2680 | ||
e279b6c1 | 2681 | config COMPAT |
3c2362e6 | 2682 | def_bool y |
0bf62763 | 2683 | depends on IA32_EMULATION || X86_X32 |
e279b6c1 | 2684 | |
3120e25e | 2685 | if COMPAT |
e279b6c1 | 2686 | config COMPAT_FOR_U64_ALIGNMENT |
3120e25e | 2687 | def_bool y |
e279b6c1 SR |
2688 | |
2689 | config SYSVIPC_COMPAT | |
3c2362e6 | 2690 | def_bool y |
3120e25e | 2691 | depends on SYSVIPC |
e279b6c1 | 2692 | |
ee009e4a | 2693 | config KEYS_COMPAT |
3120e25e JB |
2694 | def_bool y |
2695 | depends on KEYS | |
2696 | endif | |
ee009e4a | 2697 | |
e279b6c1 SR |
2698 | endmenu |
2699 | ||
2700 | ||
e5beae16 KP |
2701 | config HAVE_ATOMIC_IOMAP |
2702 | def_bool y | |
2703 | depends on X86_32 | |
2704 | ||
4692d77f AR |
2705 | config X86_DEV_DMA_OPS |
2706 | bool | |
83125a3a | 2707 | depends on X86_64 || STA2X11 |
4692d77f | 2708 | |
f7219a53 AR |
2709 | config X86_DMA_REMAP |
2710 | bool | |
83125a3a | 2711 | depends on STA2X11 |
f7219a53 | 2712 | |
93e5eadd LA |
2713 | config PMC_ATOM |
2714 | def_bool y | |
2715 | depends on PCI | |
2716 | ||
185a383a KB |
2717 | config VMD |
2718 | depends on PCI_MSI | |
2719 | tristate "Volume Management Device Driver" | |
2720 | default N | |
2721 | ---help--- | |
2722 | Adds support for the Intel Volume Management Device (VMD). VMD is a | |
2723 | secondary PCI host bridge that allows PCI Express root ports, | |
2724 | and devices attached to them, to be removed from the default | |
2725 | PCI domain and placed within the VMD domain. This provides | |
2726 | more bus resources than are otherwise possible with a | |
2727 | single domain. If you know your system provides one of these and | |
2728 | has devices attached to it, say Y; if you are not sure, say N. | |
2729 | ||
e279b6c1 SR |
2730 | source "net/Kconfig" |
2731 | ||
2732 | source "drivers/Kconfig" | |
2733 | ||
2734 | source "drivers/firmware/Kconfig" | |
2735 | ||
2736 | source "fs/Kconfig" | |
2737 | ||
e279b6c1 SR |
2738 | source "arch/x86/Kconfig.debug" |
2739 | ||
2740 | source "security/Kconfig" | |
2741 | ||
2742 | source "crypto/Kconfig" | |
2743 | ||
edf88417 AK |
2744 | source "arch/x86/kvm/Kconfig" |
2745 | ||
e279b6c1 | 2746 | source "lib/Kconfig" |