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Commit | Line | Data |
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daa93fab SR |
1 | # Select 32 or 64 bit |
2 | config 64BIT | |
6840999b SR |
3 | bool "64-bit kernel" if ARCH = "x86" |
4 | default ARCH = "x86_64" | |
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 | |
82491451 | 12 | select CLKSRC_I8253 |
af1839eb | 13 | select HAVE_UID16 |
daa93fab SR |
14 | |
15 | config X86_64 | |
3120e25e JB |
16 | def_bool y |
17 | depends on 64BIT | |
4692d77f | 18 | select X86_DEV_DMA_OPS |
1032c0ba SR |
19 | |
20 | ### Arch settings | |
8d5fffb9 | 21 | config X86 |
3c2362e6 | 22 | def_bool y |
e17c6d56 | 23 | select HAVE_AOUT if X86_32 |
a5574cf6 | 24 | select HAVE_UNSTABLE_SCHED_CLOCK |
ec7748b5 | 25 | select HAVE_IDE |
42d4b839 | 26 | select HAVE_OPROFILE |
8761f1ab | 27 | select HAVE_PCSPKR_PLATFORM |
cc2067a5 | 28 | select HAVE_PERF_EVENTS |
e360adbe | 29 | select HAVE_IRQ_WORK |
28b2ee20 | 30 | select HAVE_IOREMAP_PROT |
3f550096 | 31 | select HAVE_KPROBES |
72d7c3b3 | 32 | select HAVE_MEMBLOCK |
0608f70c | 33 | select HAVE_MEMBLOCK_NODE_MAP |
c378ddd5 | 34 | select ARCH_DISCARD_MEMBLOCK |
1f972768 | 35 | select ARCH_WANT_OPTIONAL_GPIOLIB |
da4276b8 | 36 | select ARCH_WANT_FRAME_POINTERS |
7c095e46 | 37 | select HAVE_DMA_ATTRS |
0a2b9a6e | 38 | select HAVE_DMA_CONTIGUOUS if !SWIOTLB |
9edddaa2 | 39 | select HAVE_KRETPROBES |
c0f7ac3a | 40 | select HAVE_OPTPROBES |
e4b2b886 | 41 | select HAVE_FTRACE_MCOUNT_RECORD |
d57c5d51 | 42 | select HAVE_FENTRY if X86_64 |
cf4db259 | 43 | select HAVE_C_RECORDMCOUNT |
677aa9f7 | 44 | select HAVE_DYNAMIC_FTRACE |
606576ce | 45 | select HAVE_FUNCTION_TRACER |
48d68b20 | 46 | select HAVE_FUNCTION_GRAPH_TRACER |
71e308a2 | 47 | select HAVE_FUNCTION_GRAPH_FP_TEST |
60a7ecf4 | 48 | select HAVE_FUNCTION_TRACE_MCOUNT_TEST |
66700001 | 49 | select HAVE_SYSCALL_TRACEPOINTS |
e0ec9483 | 50 | select HAVE_KVM |
49793b03 | 51 | select HAVE_ARCH_KGDB |
99bbc4b1 | 52 | select HAVE_ARCH_TRACEHOOK |
323ec001 | 53 | select HAVE_GENERIC_DMA_COHERENT if X86_32 |
58340a07 | 54 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
8d26487f | 55 | select USER_STACKTRACE_SUPPORT |
f850c30c | 56 | select HAVE_REGS_AND_STACK_ACCESS_API |
2118d0c5 | 57 | select HAVE_DMA_API_DEBUG |
2e9f3bdd PA |
58 | select HAVE_KERNEL_GZIP |
59 | select HAVE_KERNEL_BZIP2 | |
60 | select HAVE_KERNEL_LZMA | |
30314804 | 61 | select HAVE_KERNEL_XZ |
13510997 | 62 | select HAVE_KERNEL_LZO |
0067f129 | 63 | select HAVE_HW_BREAKPOINT |
0102752e | 64 | select HAVE_MIXED_BREAKPOINTS_REGS |
99e8c5a3 | 65 | select PERF_EVENTS |
c01d4323 | 66 | select HAVE_PERF_EVENTS_NMI |
c5e63197 | 67 | select HAVE_PERF_REGS |
c5ebcedb | 68 | select HAVE_PERF_USER_STACK_DUMP |
99e8c5a3 | 69 | select ANON_INODES |
43570fd2 | 70 | select HAVE_ALIGNED_STRUCT_PAGE if SLUB && !M386 |
4156153c | 71 | select HAVE_CMPXCHG_LOCAL if !M386 |
2565409f | 72 | select HAVE_CMPXCHG_DOUBLE |
0a4af3b0 | 73 | select HAVE_ARCH_KMEMCHECK |
7c68af6e | 74 | select HAVE_USER_RETURN_NOTIFIER |
e39f5602 | 75 | select ARCH_BINFMT_ELF_RANDOMIZE_PIE |
46eb3b64 | 76 | select HAVE_ARCH_JUMP_LABEL |
3cba11d3 | 77 | select HAVE_TEXT_POKE_SMP |
3bb9808e | 78 | select HAVE_GENERIC_HARDIRQS |
7463449b | 79 | select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE |
141d55e6 | 80 | select SPARSE_IRQ |
c49aa5bd | 81 | select GENERIC_FIND_FIRST_BIT |
3bb9808e TG |
82 | select GENERIC_IRQ_PROBE |
83 | select GENERIC_PENDING_IRQ if SMP | |
517e4981 | 84 | select GENERIC_IRQ_SHOW |
d1748302 | 85 | select GENERIC_CLOCKEVENTS_MIN_ADJUST |
c0185808 | 86 | select IRQ_FORCED_THREADING |
351f8f8e | 87 | select USE_GENERIC_SMP_HELPERS if SMP |
e47b65b0 | 88 | select HAVE_BPF_JIT if X86_64 |
0a779c57 | 89 | select CLKEVT_I8253 |
df013ffb | 90 | select ARCH_HAVE_NMI_SAFE_CMPXCHG |
4673ca8e | 91 | select GENERIC_IOMAP |
e419b4cc | 92 | select DCACHE_WORD_ACCESS |
7eb43a6d | 93 | select GENERIC_SMP_IDLE_THREAD |
c1d7e01d | 94 | select ARCH_WANT_IPC_PARSE_VERSION if X86_32 |
c6cfbeb4 | 95 | select HAVE_ARCH_SECCOMP_FILTER |
8b5ad472 | 96 | select BUILDTIME_EXTABLE_SORT |
bdebaf80 TG |
97 | select GENERIC_CMOS_UPDATE |
98 | select CLOCKSOURCE_WATCHDOG | |
99 | select GENERIC_CLOCKEVENTS | |
100 | select ARCH_CLOCKSOURCE_DATA if X86_64 | |
101 | select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) | |
102 | select GENERIC_TIME_VSYSCALL if X86_64 | |
103 | select KTIME_SCALAR if X86_32 | |
4ae73f2d | 104 | select GENERIC_STRNCPY_FROM_USER |
5723aa99 | 105 | select GENERIC_STRNLEN_USER |
edf55fda | 106 | select HAVE_RCU_USER_QS if X86_64 |
fdf9c356 | 107 | select HAVE_IRQ_TIME_ACCOUNTING |
7d8330a5 | 108 | |
ba7e4d13 | 109 | config INSTRUCTION_DECODER |
3120e25e JB |
110 | def_bool y |
111 | depends on KPROBES || PERF_EVENTS || UPROBES | |
ba7e4d13 | 112 | |
51b26ada LT |
113 | config OUTPUT_FORMAT |
114 | string | |
115 | default "elf32-i386" if X86_32 | |
116 | default "elf64-x86-64" if X86_64 | |
117 | ||
73531905 | 118 | config ARCH_DEFCONFIG |
b9b39bfb | 119 | string |
73531905 SR |
120 | default "arch/x86/configs/i386_defconfig" if X86_32 |
121 | default "arch/x86/configs/x86_64_defconfig" if X86_64 | |
b9b39bfb | 122 | |
8d5fffb9 | 123 | config LOCKDEP_SUPPORT |
3c2362e6 | 124 | def_bool y |
8d5fffb9 SR |
125 | |
126 | config STACKTRACE_SUPPORT | |
3c2362e6 | 127 | def_bool y |
8d5fffb9 | 128 | |
aa7d9350 HC |
129 | config HAVE_LATENCYTOP_SUPPORT |
130 | def_bool y | |
131 | ||
8d5fffb9 | 132 | config MMU |
3c2362e6 | 133 | def_bool y |
8d5fffb9 | 134 | |
8d5fffb9 SR |
135 | config SBUS |
136 | bool | |
137 | ||
3bc4e459 | 138 | config NEED_DMA_MAP_STATE |
3120e25e JB |
139 | def_bool y |
140 | depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG | |
3bc4e459 | 141 | |
18e98307 | 142 | config NEED_SG_DMA_LENGTH |
4a14d84e | 143 | def_bool y |
18e98307 | 144 | |
8d5fffb9 | 145 | config GENERIC_ISA_DMA |
3120e25e JB |
146 | def_bool y |
147 | depends on ISA_DMA_API | |
8d5fffb9 | 148 | |
8d5fffb9 | 149 | config GENERIC_BUG |
3c2362e6 | 150 | def_bool y |
8d5fffb9 | 151 | depends on BUG |
b93a531e JB |
152 | select GENERIC_BUG_RELATIVE_POINTERS if X86_64 |
153 | ||
154 | config GENERIC_BUG_RELATIVE_POINTERS | |
155 | bool | |
8d5fffb9 SR |
156 | |
157 | config GENERIC_HWEIGHT | |
3c2362e6 | 158 | def_bool y |
8d5fffb9 | 159 | |
a6082959 | 160 | config GENERIC_GPIO |
9ba16087 | 161 | bool |
a6082959 | 162 | |
8d5fffb9 | 163 | config ARCH_MAY_HAVE_PC_FDC |
3120e25e JB |
164 | def_bool y |
165 | depends on ISA_DMA_API | |
8d5fffb9 | 166 | |
1032c0ba | 167 | config RWSEM_GENERIC_SPINLOCK |
3120e25e JB |
168 | def_bool y |
169 | depends on !X86_XADD | |
1032c0ba SR |
170 | |
171 | config RWSEM_XCHGADD_ALGORITHM | |
3120e25e JB |
172 | def_bool y |
173 | depends on X86_XADD | |
1032c0ba | 174 | |
1032c0ba SR |
175 | config GENERIC_CALIBRATE_DELAY |
176 | def_bool y | |
177 | ||
9a0b8415 | 178 | config ARCH_HAS_CPU_RELAX |
179 | def_bool y | |
180 | ||
89cedfef VP |
181 | config ARCH_HAS_DEFAULT_IDLE |
182 | def_bool y | |
183 | ||
1b27d05b PE |
184 | config ARCH_HAS_CACHE_LINE_SIZE |
185 | def_bool y | |
186 | ||
fad12ac8 TR |
187 | config ARCH_HAS_CPU_AUTOPROBE |
188 | def_bool y | |
189 | ||
dd5af90a | 190 | config HAVE_SETUP_PER_CPU_AREA |
89c9c4c5 | 191 | def_bool y |
b32ef636 | 192 | |
08fc4580 TH |
193 | config NEED_PER_CPU_EMBED_FIRST_CHUNK |
194 | def_bool y | |
195 | ||
196 | config NEED_PER_CPU_PAGE_FIRST_CHUNK | |
11124411 TH |
197 | def_bool y |
198 | ||
801e4062 JB |
199 | config ARCH_HIBERNATION_POSSIBLE |
200 | def_bool y | |
801e4062 | 201 | |
f4cb5700 JB |
202 | config ARCH_SUSPEND_POSSIBLE |
203 | def_bool y | |
f4cb5700 | 204 | |
8d5fffb9 SR |
205 | config ZONE_DMA32 |
206 | bool | |
207 | default X86_64 | |
208 | ||
8d5fffb9 SR |
209 | config AUDIT_ARCH |
210 | bool | |
211 | default X86_64 | |
212 | ||
765c68bd IM |
213 | config ARCH_SUPPORTS_OPTIMIZED_INLINING |
214 | def_bool y | |
215 | ||
6a11f75b AM |
216 | config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
217 | def_bool y | |
218 | ||
69575d38 SW |
219 | config HAVE_INTEL_TXT |
220 | def_bool y | |
d3f13810 | 221 | depends on EXPERIMENTAL && INTEL_IOMMU && ACPI |
69575d38 | 222 | |
6b0c3d44 SR |
223 | config X86_32_SMP |
224 | def_bool y | |
225 | depends on X86_32 && SMP | |
226 | ||
227 | config X86_64_SMP | |
228 | def_bool y | |
229 | depends on X86_64 && SMP | |
230 | ||
8d5fffb9 | 231 | config X86_HT |
6fc108a0 | 232 | def_bool y |
ee0011a7 | 233 | depends on SMP |
8d5fffb9 | 234 | |
ccbeed3a TH |
235 | config X86_32_LAZY_GS |
236 | def_bool y | |
60a5317f | 237 | depends on X86_32 && !CC_STACKPROTECTOR |
ccbeed3a | 238 | |
d61931d8 BP |
239 | config ARCH_HWEIGHT_CFLAGS |
240 | string | |
241 | default "-fcall-saved-ecx -fcall-saved-edx" if X86_32 | |
242 | 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 | |
243 | ||
d7c53c9e BP |
244 | config ARCH_CPU_PROBE_RELEASE |
245 | def_bool y | |
246 | depends on HOTPLUG_CPU | |
247 | ||
2b144498 SD |
248 | config ARCH_SUPPORTS_UPROBES |
249 | def_bool y | |
250 | ||
506f1d07 | 251 | source "init/Kconfig" |
dc52ddc0 | 252 | source "kernel/Kconfig.freezer" |
8d5fffb9 | 253 | |
506f1d07 SR |
254 | menu "Processor type and features" |
255 | ||
5ee71535 RD |
256 | config ZONE_DMA |
257 | bool "DMA memory allocation support" if EXPERT | |
258 | default y | |
259 | help | |
260 | DMA memory allocation support allows devices with less than 32-bit | |
261 | addressing to allocate within the first 16MB of address space. | |
262 | Disable if no such devices will be used. | |
263 | ||
264 | If unsure, say Y. | |
265 | ||
506f1d07 SR |
266 | config SMP |
267 | bool "Symmetric multi-processing support" | |
268 | ---help--- | |
269 | This enables support for systems with more than one CPU. If you have | |
270 | a system with only one CPU, like most personal computers, say N. If | |
271 | you have a system with more than one CPU, say Y. | |
272 | ||
273 | If you say N here, the kernel will run on single and multiprocessor | |
274 | machines, but will use only one CPU of a multiprocessor machine. If | |
275 | you say Y here, the kernel will run on many, but not all, | |
276 | singleprocessor machines. On a singleprocessor machine, the kernel | |
277 | will run faster if you say N here. | |
278 | ||
279 | Note that if you say Y here and choose architecture "586" or | |
280 | "Pentium" under "Processor family", the kernel will not work on 486 | |
281 | architectures. Similarly, multiprocessor kernels for the "PPro" | |
282 | architecture may not work on all Pentium based boards. | |
283 | ||
284 | People using multiprocessor machines who say Y here should also say | |
285 | Y to "Enhanced Real Time Clock Support", below. The "Advanced Power | |
286 | Management" code will be disabled if you say Y here. | |
287 | ||
395cf969 | 288 | See also <file:Documentation/x86/i386/IO-APIC.txt>, |
506f1d07 SR |
289 | <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at |
290 | <http://www.tldp.org/docs.html#howto>. | |
291 | ||
292 | If you don't know what to do here, say N. | |
293 | ||
06cd9a7d YL |
294 | config X86_X2APIC |
295 | bool "Support x2apic" | |
d3f13810 | 296 | depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP |
06cd9a7d YL |
297 | ---help--- |
298 | This enables x2apic support on CPUs that have this feature. | |
299 | ||
300 | This allows 32-bit apic IDs (so it can support very large systems), | |
301 | and accesses the local apic via MSRs not via mmio. | |
302 | ||
06cd9a7d YL |
303 | If you don't know what to do here, say N. |
304 | ||
6695c85b | 305 | config X86_MPPARSE |
7a527688 JB |
306 | bool "Enable MPS table" if ACPI |
307 | default y | |
5ab74722 | 308 | depends on X86_LOCAL_APIC |
8f9ca475 | 309 | ---help--- |
6695c85b YL |
310 | For old smp systems that do not have proper acpi support. Newer systems |
311 | (esp with 64bit cpus) with acpi support, MADT and DSDT will override it | |
6695c85b | 312 | |
26f7ef14 YL |
313 | config X86_BIGSMP |
314 | bool "Support for big SMP systems with more than 8 CPUs" | |
315 | depends on X86_32 && SMP | |
8f9ca475 | 316 | ---help--- |
26f7ef14 | 317 | This option is needed for the systems that have more than 8 CPUs |
506f1d07 | 318 | |
8425091f | 319 | if X86_32 |
c5c606d9 RT |
320 | config X86_EXTENDED_PLATFORM |
321 | bool "Support for extended (non-PC) x86 platforms" | |
322 | default y | |
8f9ca475 | 323 | ---help--- |
06ac8346 IM |
324 | If you disable this option then the kernel will only support |
325 | standard PC platforms. (which covers the vast majority of | |
326 | systems out there.) | |
327 | ||
8425091f RT |
328 | If you enable this option then you'll be able to select support |
329 | for the following (non-PC) 32 bit x86 platforms: | |
330 | AMD Elan | |
331 | NUMAQ (IBM/Sequent) | |
332 | RDC R-321x SoC | |
333 | SGI 320/540 (Visual Workstation) | |
83125a3a | 334 | STA2X11-based (e.g. Northville) |
8425091f RT |
335 | Summit/EXA (IBM x440) |
336 | Unisys ES7000 IA32 series | |
3f4110a4 | 337 | Moorestown MID devices |
06ac8346 IM |
338 | |
339 | If you have one of these systems, or if you want to build a | |
340 | generic distribution kernel, say Y here - otherwise say N. | |
8425091f | 341 | endif |
06ac8346 | 342 | |
8425091f RT |
343 | if X86_64 |
344 | config X86_EXTENDED_PLATFORM | |
345 | bool "Support for extended (non-PC) x86 platforms" | |
346 | default y | |
347 | ---help--- | |
348 | If you disable this option then the kernel will only support | |
349 | standard PC platforms. (which covers the vast majority of | |
350 | systems out there.) | |
351 | ||
352 | If you enable this option then you'll be able to select support | |
353 | for the following (non-PC) 64 bit x86 platforms: | |
44b111b5 | 354 | Numascale NumaChip |
8425091f RT |
355 | ScaleMP vSMP |
356 | SGI Ultraviolet | |
357 | ||
358 | If you have one of these systems, or if you want to build a | |
359 | generic distribution kernel, say Y here - otherwise say N. | |
360 | endif | |
c5c606d9 RT |
361 | # This is an alphabetically sorted list of 64 bit extended platforms |
362 | # Please maintain the alphabetic order if and when there are additions | |
44b111b5 SP |
363 | config X86_NUMACHIP |
364 | bool "Numascale NumaChip" | |
365 | depends on X86_64 | |
366 | depends on X86_EXTENDED_PLATFORM | |
367 | depends on NUMA | |
368 | depends on SMP | |
369 | depends on X86_X2APIC | |
44b111b5 SP |
370 | ---help--- |
371 | Adds support for Numascale NumaChip large-SMP systems. Needed to | |
372 | enable more than ~168 cores. | |
373 | If you don't have one of these, you should say N here. | |
506f1d07 | 374 | |
c5c606d9 RT |
375 | config X86_VSMP |
376 | bool "ScaleMP vSMP" | |
03f1a17c | 377 | select PARAVIRT_GUEST |
c5c606d9 RT |
378 | select PARAVIRT |
379 | depends on X86_64 && PCI | |
380 | depends on X86_EXTENDED_PLATFORM | |
ead91d4b | 381 | depends on SMP |
8f9ca475 | 382 | ---help--- |
c5c606d9 RT |
383 | Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is |
384 | supposed to run on these EM64T-based machines. Only choose this option | |
385 | if you have one of these machines. | |
5e3a77e9 | 386 | |
03b48632 NP |
387 | config X86_UV |
388 | bool "SGI Ultraviolet" | |
389 | depends on X86_64 | |
c5c606d9 | 390 | depends on X86_EXTENDED_PLATFORM |
54c28d29 | 391 | depends on NUMA |
9d6c26e7 | 392 | depends on X86_X2APIC |
8f9ca475 | 393 | ---help--- |
03b48632 NP |
394 | This option is needed in order to support SGI Ultraviolet systems. |
395 | If you don't have one of these, you should say N here. | |
396 | ||
c5c606d9 RT |
397 | # Following is an alphabetically sorted list of 32 bit extended platforms |
398 | # Please maintain the alphabetic order if and when there are additions | |
506f1d07 | 399 | |
c751e17b TG |
400 | config X86_INTEL_CE |
401 | bool "CE4100 TV platform" | |
402 | depends on PCI | |
403 | depends on PCI_GODIRECT | |
404 | depends on X86_32 | |
405 | depends on X86_EXTENDED_PLATFORM | |
37bc9f50 | 406 | select X86_REBOOTFIXUPS |
da6b737b SAS |
407 | select OF |
408 | select OF_EARLY_FLATTREE | |
b4e51854 | 409 | select IRQ_DOMAIN |
c751e17b TG |
410 | ---help--- |
411 | Select for the Intel CE media processor (CE4100) SOC. | |
412 | This option compiles in support for the CE4100 SOC for settop | |
413 | boxes and media devices. | |
414 | ||
dd137525 | 415 | config X86_WANT_INTEL_MID |
43605ef1 AC |
416 | bool "Intel MID platform support" |
417 | depends on X86_32 | |
418 | depends on X86_EXTENDED_PLATFORM | |
419 | ---help--- | |
420 | Select to build a kernel capable of supporting Intel MID platform | |
421 | systems which do not have the PCI legacy interfaces (Moorestown, | |
422 | Medfield). If you are building for a PC class system say N here. | |
423 | ||
dd137525 | 424 | if X86_WANT_INTEL_MID |
43605ef1 | 425 | |
4e2b1c4f AC |
426 | config X86_INTEL_MID |
427 | bool | |
428 | ||
1ea7c673 AC |
429 | config X86_MDFLD |
430 | bool "Medfield MID platform" | |
431 | depends on PCI | |
432 | depends on PCI_GOANY | |
433 | depends on X86_IO_APIC | |
7c9c3a1e AC |
434 | select X86_INTEL_MID |
435 | select SFI | |
436 | select DW_APB_TIMER | |
1ea7c673 AC |
437 | select APB_TIMER |
438 | select I2C | |
439 | select SPI | |
440 | select INTEL_SCU_IPC | |
441 | select X86_PLATFORM_DEVICES | |
15a713df | 442 | select MFD_INTEL_MSIC |
1ea7c673 AC |
443 | ---help--- |
444 | Medfield is Intel's Low Power Intel Architecture (LPIA) based Moblin | |
445 | Internet Device(MID) platform. | |
446 | Unlike standard x86 PCs, Medfield does not have many legacy devices | |
447 | nor standard legacy replacement devices/features. e.g. Medfield does | |
448 | not contain i8259, i8254, HPET, legacy BIOS, most of the io ports. | |
449 | ||
43605ef1 AC |
450 | endif |
451 | ||
c5c606d9 RT |
452 | config X86_RDC321X |
453 | bool "RDC R-321x SoC" | |
506f1d07 | 454 | depends on X86_32 |
c5c606d9 RT |
455 | depends on X86_EXTENDED_PLATFORM |
456 | select M486 | |
457 | select X86_REBOOTFIXUPS | |
458 | ---help--- | |
459 | This option is needed for RDC R-321x system-on-chip, also known | |
460 | as R-8610-(G). | |
461 | If you don't have one of these chips, you should say N here. | |
462 | ||
e0c7ae37 | 463 | config X86_32_NON_STANDARD |
9c398017 IM |
464 | bool "Support non-standard 32-bit SMP architectures" |
465 | depends on X86_32 && SMP | |
c5c606d9 | 466 | depends on X86_EXTENDED_PLATFORM |
8f9ca475 | 467 | ---help--- |
83125a3a AR |
468 | This option compiles in the NUMAQ, Summit, bigsmp, ES7000, |
469 | STA2X11, default subarchitectures. It is intended for a generic | |
470 | binary kernel. If you select them all, kernel will probe it | |
471 | one by one and will fallback to default. | |
d49c4288 | 472 | |
c5c606d9 | 473 | # Alphabetically sorted list of Non standard 32 bit platforms |
d49c4288 | 474 | |
506f1d07 SR |
475 | config X86_NUMAQ |
476 | bool "NUMAQ (IBM/Sequent)" | |
e0c7ae37 | 477 | depends on X86_32_NON_STANDARD |
a92d152e | 478 | depends on PCI |
506f1d07 | 479 | select NUMA |
9c398017 | 480 | select X86_MPPARSE |
8f9ca475 | 481 | ---help--- |
d49c4288 YL |
482 | This option is used for getting Linux to run on a NUMAQ (IBM/Sequent) |
483 | NUMA multiquad box. This changes the way that processors are | |
484 | bootstrapped, and uses Clustered Logical APIC addressing mode instead | |
485 | of Flat Logical. You will need a new lynxer.elf file to flash your | |
486 | firmware with - send email to <Martin.Bligh@us.ibm.com>. | |
506f1d07 | 487 | |
d949f36f | 488 | config X86_SUPPORTS_MEMORY_FAILURE |
6fc108a0 | 489 | def_bool y |
d949f36f LT |
490 | # MCE code calls memory_failure(): |
491 | depends on X86_MCE | |
492 | # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags: | |
493 | depends on !X86_NUMAQ | |
494 | # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH: | |
495 | depends on X86_64 || !SPARSEMEM | |
496 | select ARCH_SUPPORTS_MEMORY_FAILURE | |
d949f36f | 497 | |
1b84e1c8 IM |
498 | config X86_VISWS |
499 | bool "SGI 320/540 (Visual Workstation)" | |
c5c606d9 RT |
500 | depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT |
501 | depends on X86_32_NON_STANDARD | |
502 | ---help--- | |
1b84e1c8 IM |
503 | The SGI Visual Workstation series is an IA32-based workstation |
504 | based on SGI systems chips with some legacy PC hardware attached. | |
505 | ||
506 | Say Y here to create a kernel to run on the SGI 320 or 540. | |
507 | ||
508 | A kernel compiled for the Visual Workstation will run on general | |
509 | PCs as well. See <file:Documentation/sgi-visws.txt> for details. | |
510 | ||
83125a3a AR |
511 | config STA2X11 |
512 | bool "STA2X11 Companion Chip Support" | |
513 | depends on X86_32_NON_STANDARD && PCI | |
514 | select X86_DEV_DMA_OPS | |
515 | select X86_DMA_REMAP | |
516 | select SWIOTLB | |
517 | select MFD_STA2X11 | |
518 | select ARCH_REQUIRE_GPIOLIB | |
519 | default n | |
520 | ---help--- | |
521 | This adds support for boards based on the STA2X11 IO-Hub, | |
522 | a.k.a. "ConneXt". The chip is used in place of the standard | |
523 | PC chipset, so all "standard" peripherals are missing. If this | |
524 | option is selected the kernel will still be able to boot on | |
525 | standard PC machines. | |
526 | ||
9c398017 IM |
527 | config X86_SUMMIT |
528 | bool "Summit/EXA (IBM x440)" | |
e0c7ae37 | 529 | depends on X86_32_NON_STANDARD |
8f9ca475 | 530 | ---help--- |
9c398017 IM |
531 | This option is needed for IBM systems that use the Summit/EXA chipset. |
532 | In particular, it is needed for the x440. | |
1f972768 | 533 | |
9c398017 | 534 | config X86_ES7000 |
c5c606d9 | 535 | bool "Unisys ES7000 IA32 series" |
26f7ef14 | 536 | depends on X86_32_NON_STANDARD && X86_BIGSMP |
8f9ca475 | 537 | ---help--- |
9c398017 IM |
538 | Support for Unisys ES7000 systems. Say 'Y' here if this kernel is |
539 | supposed to run on an IA32-based Unisys ES7000 system. | |
540 | ||
82148d1d S |
541 | config X86_32_IRIS |
542 | tristate "Eurobraille/Iris poweroff module" | |
543 | depends on X86_32 | |
544 | ---help--- | |
545 | The Iris machines from EuroBraille do not have APM or ACPI support | |
546 | to shut themselves down properly. A special I/O sequence is | |
547 | needed to do so, which is what this module does at | |
548 | kernel shutdown. | |
549 | ||
550 | This is only for Iris machines from EuroBraille. | |
551 | ||
552 | If unused, say N. | |
553 | ||
ae1e9130 | 554 | config SCHED_OMIT_FRAME_POINTER |
3c2362e6 HH |
555 | def_bool y |
556 | prompt "Single-depth WCHAN output" | |
a87d0914 | 557 | depends on X86 |
8f9ca475 | 558 | ---help--- |
506f1d07 SR |
559 | Calculate simpler /proc/<PID>/wchan values. If this option |
560 | is disabled then wchan values will recurse back to the | |
561 | caller function. This provides more accurate wchan values, | |
562 | at the expense of slightly more scheduling overhead. | |
563 | ||
564 | If in doubt, say "Y". | |
565 | ||
506f1d07 SR |
566 | menuconfig PARAVIRT_GUEST |
567 | bool "Paravirtualized guest support" | |
8f9ca475 | 568 | ---help--- |
506f1d07 SR |
569 | Say Y here to get to see options related to running Linux under |
570 | various hypervisors. This option alone does not add any kernel code. | |
571 | ||
572 | If you say N, all options in this submenu will be skipped and disabled. | |
573 | ||
574 | if PARAVIRT_GUEST | |
575 | ||
095c0aa8 GC |
576 | config PARAVIRT_TIME_ACCOUNTING |
577 | bool "Paravirtual steal time accounting" | |
578 | select PARAVIRT | |
579 | default n | |
580 | ---help--- | |
581 | Select this option to enable fine granularity task steal time | |
582 | accounting. Time spent executing other tasks in parallel with | |
583 | the current vCPU is discounted from the vCPU power. To account for | |
584 | that, there can be a small performance impact. | |
585 | ||
586 | If in doubt, say N here. | |
587 | ||
506f1d07 SR |
588 | source "arch/x86/xen/Kconfig" |
589 | ||
0cf1bfd2 | 590 | config KVM_GUEST |
90993cdd MT |
591 | bool "KVM Guest support (including kvmclock)" |
592 | select PARAVIRT | |
0cf1bfd2 | 593 | select PARAVIRT |
90993cdd MT |
594 | select PARAVIRT_CLOCK |
595 | default y if PARAVIRT_GUEST | |
8f9ca475 IM |
596 | ---help--- |
597 | This option enables various optimizations for running under the KVM | |
90993cdd MT |
598 | hypervisor. It includes a paravirtualized clock, so that instead |
599 | of relying on a PIT (or probably other) emulation by the | |
600 | underlying device model, the host provides the guest with | |
601 | timing infrastructure such as time of day, and system time | |
0cf1bfd2 | 602 | |
506f1d07 SR |
603 | source "arch/x86/lguest/Kconfig" |
604 | ||
e61bd94a EPH |
605 | config PARAVIRT |
606 | bool "Enable paravirtualization code" | |
8f9ca475 | 607 | ---help--- |
e61bd94a EPH |
608 | This changes the kernel so it can modify itself when it is run |
609 | under a hypervisor, potentially improving performance significantly | |
610 | over full virtualization. However, when run without a hypervisor | |
611 | the kernel is theoretically slower and slightly larger. | |
612 | ||
b4ecc126 JF |
613 | config PARAVIRT_SPINLOCKS |
614 | bool "Paravirtualization layer for spinlocks" | |
615 | depends on PARAVIRT && SMP && EXPERIMENTAL | |
616 | ---help--- | |
617 | Paravirtualized spinlocks allow a pvops backend to replace the | |
618 | spinlock implementation with something virtualization-friendly | |
619 | (for example, block the virtual CPU rather than spinning). | |
620 | ||
621 | Unfortunately the downside is an up to 5% performance hit on | |
622 | native kernels, with various workloads. | |
623 | ||
624 | If you are unsure how to answer this question, answer N. | |
625 | ||
7af192c9 GH |
626 | config PARAVIRT_CLOCK |
627 | bool | |
7af192c9 | 628 | |
506f1d07 SR |
629 | endif |
630 | ||
97349135 | 631 | config PARAVIRT_DEBUG |
8f9ca475 IM |
632 | bool "paravirt-ops debugging" |
633 | depends on PARAVIRT && DEBUG_KERNEL | |
634 | ---help--- | |
635 | Enable to debug paravirt_ops internals. Specifically, BUG if | |
636 | a paravirt_op is missing when it is called. | |
97349135 | 637 | |
08677214 | 638 | config NO_BOOTMEM |
774ea0bc | 639 | def_bool y |
08677214 | 640 | |
03273184 YL |
641 | config MEMTEST |
642 | bool "Memtest" | |
8f9ca475 | 643 | ---help--- |
c64df707 | 644 | This option adds a kernel parameter 'memtest', which allows memtest |
03273184 | 645 | to be set. |
8f9ca475 IM |
646 | memtest=0, mean disabled; -- default |
647 | memtest=1, mean do 1 test pattern; | |
648 | ... | |
649 | memtest=4, mean do 4 test patterns. | |
aba3728c | 650 | If you are unsure how to answer this question, answer N. |
506f1d07 SR |
651 | |
652 | config X86_SUMMIT_NUMA | |
3c2362e6 | 653 | def_bool y |
e0c7ae37 | 654 | depends on X86_32 && NUMA && X86_32_NON_STANDARD |
506f1d07 SR |
655 | |
656 | config X86_CYCLONE_TIMER | |
3c2362e6 | 657 | def_bool y |
f9b15df4 | 658 | depends on X86_SUMMIT |
506f1d07 | 659 | |
506f1d07 SR |
660 | source "arch/x86/Kconfig.cpu" |
661 | ||
662 | config HPET_TIMER | |
3c2362e6 | 663 | def_bool X86_64 |
506f1d07 | 664 | prompt "HPET Timer Support" if X86_32 |
8f9ca475 IM |
665 | ---help--- |
666 | Use the IA-PC HPET (High Precision Event Timer) to manage | |
667 | time in preference to the PIT and RTC, if a HPET is | |
668 | present. | |
669 | HPET is the next generation timer replacing legacy 8254s. | |
670 | The HPET provides a stable time base on SMP | |
671 | systems, unlike the TSC, but it is more expensive to access, | |
672 | as it is off-chip. You can find the HPET spec at | |
673 | <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>. | |
506f1d07 | 674 | |
8f9ca475 IM |
675 | You can safely choose Y here. However, HPET will only be |
676 | activated if the platform and the BIOS support this feature. | |
677 | Otherwise the 8254 will be used for timing services. | |
506f1d07 | 678 | |
8f9ca475 | 679 | Choose N to continue using the legacy 8254 timer. |
506f1d07 SR |
680 | |
681 | config HPET_EMULATE_RTC | |
3c2362e6 | 682 | def_bool y |
9d8af78b | 683 | depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) |
506f1d07 | 684 | |
bb24c471 | 685 | config APB_TIMER |
933b9463 AC |
686 | def_bool y if X86_INTEL_MID |
687 | prompt "Intel MID APB Timer Support" if X86_INTEL_MID | |
06c3df49 | 688 | select DW_APB_TIMER |
a0c3832a | 689 | depends on X86_INTEL_MID && SFI |
bb24c471 JP |
690 | help |
691 | APB timer is the replacement for 8254, HPET on X86 MID platforms. | |
692 | The APBT provides a stable time base on SMP | |
693 | systems, unlike the TSC, but it is more expensive to access, | |
694 | as it is off-chip. APB timers are always running regardless of CPU | |
695 | C states, they are used as per CPU clockevent device when possible. | |
696 | ||
6a108a14 | 697 | # Mark as expert because too many people got it wrong. |
506f1d07 | 698 | # The code disables itself when not needed. |
7ae9392c TP |
699 | config DMI |
700 | default y | |
6a108a14 | 701 | bool "Enable DMI scanning" if EXPERT |
8f9ca475 | 702 | ---help--- |
7ae9392c TP |
703 | Enabled scanning of DMI to identify machine quirks. Say Y |
704 | here unless you have verified that your setup is not | |
705 | affected by entries in the DMI blacklist. Required by PNP | |
706 | BIOS code. | |
707 | ||
506f1d07 | 708 | config GART_IOMMU |
6a108a14 | 709 | bool "GART IOMMU support" if EXPERT |
506f1d07 SR |
710 | default y |
711 | select SWIOTLB | |
23ac4ae8 | 712 | depends on X86_64 && PCI && AMD_NB |
8f9ca475 | 713 | ---help--- |
506f1d07 SR |
714 | Support for full DMA access of devices with 32bit memory access only |
715 | on systems with more than 3GB. This is usually needed for USB, | |
716 | sound, many IDE/SATA chipsets and some other devices. | |
717 | Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART | |
718 | based hardware IOMMU and a software bounce buffer based IOMMU used | |
719 | on Intel systems and as fallback. | |
720 | The code is only active when needed (enough memory and limited | |
721 | device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified | |
722 | too. | |
723 | ||
724 | config CALGARY_IOMMU | |
725 | bool "IBM Calgary IOMMU support" | |
726 | select SWIOTLB | |
727 | depends on X86_64 && PCI && EXPERIMENTAL | |
8f9ca475 | 728 | ---help--- |
506f1d07 SR |
729 | Support for hardware IOMMUs in IBM's xSeries x366 and x460 |
730 | systems. Needed to run systems with more than 3GB of memory | |
731 | properly with 32-bit PCI devices that do not support DAC | |
732 | (Double Address Cycle). Calgary also supports bus level | |
733 | isolation, where all DMAs pass through the IOMMU. This | |
734 | prevents them from going anywhere except their intended | |
735 | destination. This catches hard-to-find kernel bugs and | |
736 | mis-behaving drivers and devices that do not use the DMA-API | |
737 | properly to set up their DMA buffers. The IOMMU can be | |
738 | turned off at boot time with the iommu=off parameter. | |
739 | Normally the kernel will make the right choice by itself. | |
740 | If unsure, say Y. | |
741 | ||
742 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT | |
3c2362e6 HH |
743 | def_bool y |
744 | prompt "Should Calgary be enabled by default?" | |
506f1d07 | 745 | depends on CALGARY_IOMMU |
8f9ca475 | 746 | ---help--- |
506f1d07 SR |
747 | Should Calgary be enabled by default? if you choose 'y', Calgary |
748 | will be used (if it exists). If you choose 'n', Calgary will not be | |
749 | used even if it exists. If you choose 'n' and would like to use | |
750 | Calgary anyway, pass 'iommu=calgary' on the kernel command line. | |
751 | If unsure, say Y. | |
752 | ||
753 | # need this always selected by IOMMU for the VIA workaround | |
754 | config SWIOTLB | |
a1afd01c | 755 | def_bool y if X86_64 |
8f9ca475 | 756 | ---help--- |
506f1d07 | 757 | Support for software bounce buffers used on x86-64 systems |
4454d327 JM |
758 | which don't have a hardware IOMMU. Using this PCI devices |
759 | which can only access 32-bits of memory can be used on systems | |
760 | with more than 3 GB of memory. | |
761 | If unsure, say Y. | |
506f1d07 | 762 | |
a8522509 | 763 | config IOMMU_HELPER |
3120e25e JB |
764 | def_bool y |
765 | depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU | |
d25e26b6 | 766 | |
1184dc2f | 767 | config MAXSMP |
ddb0c5a6 | 768 | bool "Enable Maximum number of SMP Processors and NUMA Nodes" |
36f5101a MT |
769 | depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL |
770 | select CPUMASK_OFFSTACK | |
8f9ca475 | 771 | ---help--- |
ddb0c5a6 | 772 | Enable maximum number of CPUS and NUMA Nodes for this architecture. |
1184dc2f | 773 | If unsure, say N. |
506f1d07 SR |
774 | |
775 | config NR_CPUS | |
36f5101a | 776 | int "Maximum number of CPUs" if SMP && !MAXSMP |
2a3313f4 | 777 | range 2 8 if SMP && X86_32 && !X86_BIGSMP |
36f5101a | 778 | range 2 512 if SMP && !MAXSMP |
78637a97 | 779 | default "1" if !SMP |
d25e26b6 | 780 | default "4096" if MAXSMP |
78637a97 MT |
781 | default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000) |
782 | default "8" if SMP | |
8f9ca475 | 783 | ---help--- |
506f1d07 | 784 | This allows you to specify the maximum number of CPUs which this |
d25e26b6 | 785 | kernel will support. The maximum supported value is 512 and the |
506f1d07 SR |
786 | minimum value which makes sense is 2. |
787 | ||
788 | This is purely to save memory - each supported CPU adds | |
789 | approximately eight kilobytes to the kernel image. | |
790 | ||
791 | config SCHED_SMT | |
792 | bool "SMT (Hyperthreading) scheduler support" | |
b089c12b | 793 | depends on X86_HT |
8f9ca475 | 794 | ---help--- |
506f1d07 SR |
795 | SMT scheduler support improves the CPU scheduler's decision making |
796 | when dealing with Intel Pentium 4 chips with HyperThreading at a | |
797 | cost of slightly increased overhead in some places. If unsure say | |
798 | N here. | |
799 | ||
800 | config SCHED_MC | |
3c2362e6 HH |
801 | def_bool y |
802 | prompt "Multi-core scheduler support" | |
b089c12b | 803 | depends on X86_HT |
8f9ca475 | 804 | ---help--- |
506f1d07 SR |
805 | Multi-core scheduler support improves the CPU scheduler's decision |
806 | making when dealing with multi-core CPU chips at a cost of slightly | |
807 | increased overhead in some places. If unsure say N here. | |
808 | ||
809 | source "kernel/Kconfig.preempt" | |
810 | ||
811 | config X86_UP_APIC | |
812 | bool "Local APIC support on uniprocessors" | |
e0c7ae37 | 813 | depends on X86_32 && !SMP && !X86_32_NON_STANDARD |
8f9ca475 | 814 | ---help--- |
506f1d07 SR |
815 | A local APIC (Advanced Programmable Interrupt Controller) is an |
816 | integrated interrupt controller in the CPU. If you have a single-CPU | |
817 | system which has a processor with a local APIC, you can say Y here to | |
818 | enable and use it. If you say Y here even though your machine doesn't | |
819 | have a local APIC, then the kernel will still run with no slowdown at | |
820 | all. The local APIC supports CPU-generated self-interrupts (timer, | |
821 | performance counters), and the NMI watchdog which detects hard | |
822 | lockups. | |
823 | ||
824 | config X86_UP_IOAPIC | |
825 | bool "IO-APIC support on uniprocessors" | |
826 | depends on X86_UP_APIC | |
8f9ca475 | 827 | ---help--- |
506f1d07 SR |
828 | An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an |
829 | SMP-capable replacement for PC-style interrupt controllers. Most | |
830 | SMP systems and many recent uniprocessor systems have one. | |
831 | ||
832 | If you have a single-CPU system with an IO-APIC, you can say Y here | |
833 | to use it. If you say Y here even though your machine doesn't have | |
834 | an IO-APIC, then the kernel will still run with no slowdown at all. | |
835 | ||
836 | config X86_LOCAL_APIC | |
3c2362e6 | 837 | def_bool y |
e0c7ae37 | 838 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC |
506f1d07 SR |
839 | |
840 | config X86_IO_APIC | |
3c2362e6 | 841 | def_bool y |
1444e0c9 | 842 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC |
506f1d07 SR |
843 | |
844 | config X86_VISWS_APIC | |
3c2362e6 | 845 | def_bool y |
506f1d07 | 846 | depends on X86_32 && X86_VISWS |
506f1d07 | 847 | |
41b9eb26 SA |
848 | config X86_REROUTE_FOR_BROKEN_BOOT_IRQS |
849 | bool "Reroute for broken boot IRQs" | |
41b9eb26 | 850 | depends on X86_IO_APIC |
8f9ca475 | 851 | ---help--- |
41b9eb26 SA |
852 | This option enables a workaround that fixes a source of |
853 | spurious interrupts. This is recommended when threaded | |
854 | interrupt handling is used on systems where the generation of | |
855 | superfluous "boot interrupts" cannot be disabled. | |
856 | ||
857 | Some chipsets generate a legacy INTx "boot IRQ" when the IRQ | |
858 | entry in the chipset's IO-APIC is masked (as, e.g. the RT | |
859 | kernel does during interrupt handling). On chipsets where this | |
860 | boot IRQ generation cannot be disabled, this workaround keeps | |
861 | the original IRQ line masked so that only the equivalent "boot | |
862 | IRQ" is delivered to the CPUs. The workaround also tells the | |
863 | kernel to set up the IRQ handler on the boot IRQ line. In this | |
864 | way only one interrupt is delivered to the kernel. Otherwise | |
865 | the spurious second interrupt may cause the kernel to bring | |
866 | down (vital) interrupt lines. | |
867 | ||
868 | Only affects "broken" chipsets. Interrupt sharing may be | |
869 | increased on these systems. | |
870 | ||
506f1d07 | 871 | config X86_MCE |
bab9bc65 | 872 | bool "Machine Check / overheating reporting" |
e57dbaf7 | 873 | default y |
506f1d07 | 874 | ---help--- |
bab9bc65 AK |
875 | Machine Check support allows the processor to notify the |
876 | kernel if it detects a problem (e.g. overheating, data corruption). | |
506f1d07 | 877 | The action the kernel takes depends on the severity of the problem, |
bab9bc65 | 878 | ranging from warning messages to halting the machine. |
4efc0670 | 879 | |
506f1d07 | 880 | config X86_MCE_INTEL |
3c2362e6 HH |
881 | def_bool y |
882 | prompt "Intel MCE features" | |
c1ebf835 | 883 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 884 | ---help--- |
506f1d07 SR |
885 | Additional support for intel specific MCE features such as |
886 | the thermal monitor. | |
887 | ||
888 | config X86_MCE_AMD | |
3c2362e6 HH |
889 | def_bool y |
890 | prompt "AMD MCE features" | |
c1ebf835 | 891 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 892 | ---help--- |
506f1d07 SR |
893 | Additional support for AMD specific MCE features such as |
894 | the DRAM Error Threshold. | |
895 | ||
4efc0670 | 896 | config X86_ANCIENT_MCE |
6fc108a0 | 897 | bool "Support for old Pentium 5 / WinChip machine checks" |
c31d9633 | 898 | depends on X86_32 && X86_MCE |
cd13adcc HS |
899 | ---help--- |
900 | Include support for machine check handling on old Pentium 5 or WinChip | |
901 | systems. These typically need to be enabled explicitely on the command | |
902 | line. | |
4efc0670 | 903 | |
b2762686 AK |
904 | config X86_MCE_THRESHOLD |
905 | depends on X86_MCE_AMD || X86_MCE_INTEL | |
6fc108a0 | 906 | def_bool y |
b2762686 | 907 | |
ea149b36 | 908 | config X86_MCE_INJECT |
c1ebf835 | 909 | depends on X86_MCE |
ea149b36 AK |
910 | tristate "Machine check injector support" |
911 | ---help--- | |
912 | Provide support for injecting machine checks for testing purposes. | |
913 | If you don't know what a machine check is and you don't do kernel | |
914 | QA it is safe to say n. | |
915 | ||
4efc0670 AK |
916 | config X86_THERMAL_VECTOR |
917 | def_bool y | |
5bb38adc | 918 | depends on X86_MCE_INTEL |
4efc0670 | 919 | |
506f1d07 | 920 | config VM86 |
6a108a14 | 921 | bool "Enable VM86 support" if EXPERT |
506f1d07 SR |
922 | default y |
923 | depends on X86_32 | |
8f9ca475 IM |
924 | ---help--- |
925 | This option is required by programs like DOSEMU to run 16-bit legacy | |
506f1d07 | 926 | code on X86 processors. It also may be needed by software like |
8f9ca475 IM |
927 | XFree86 to initialize some video cards via BIOS. Disabling this |
928 | option saves about 6k. | |
506f1d07 SR |
929 | |
930 | config TOSHIBA | |
931 | tristate "Toshiba Laptop support" | |
932 | depends on X86_32 | |
933 | ---help--- | |
934 | This adds a driver to safely access the System Management Mode of | |
935 | the CPU on Toshiba portables with a genuine Toshiba BIOS. It does | |
936 | not work on models with a Phoenix BIOS. The System Management Mode | |
937 | is used to set the BIOS and power saving options on Toshiba portables. | |
938 | ||
939 | For information on utilities to make use of this driver see the | |
940 | Toshiba Linux utilities web site at: | |
941 | <http://www.buzzard.org.uk/toshiba/>. | |
942 | ||
943 | Say Y if you intend to run this kernel on a Toshiba portable. | |
944 | Say N otherwise. | |
945 | ||
946 | config I8K | |
947 | tristate "Dell laptop support" | |
949a9d70 | 948 | select HWMON |
506f1d07 SR |
949 | ---help--- |
950 | This adds a driver to safely access the System Management Mode | |
951 | of the CPU on the Dell Inspiron 8000. The System Management Mode | |
952 | is used to read cpu temperature and cooling fan status and to | |
953 | control the fans on the I8K portables. | |
954 | ||
955 | This driver has been tested only on the Inspiron 8000 but it may | |
956 | also work with other Dell laptops. You can force loading on other | |
957 | models by passing the parameter `force=1' to the module. Use at | |
958 | your own risk. | |
959 | ||
960 | For information on utilities to make use of this driver see the | |
961 | I8K Linux utilities web site at: | |
962 | <http://people.debian.org/~dz/i8k/> | |
963 | ||
964 | Say Y if you intend to run this kernel on a Dell Inspiron 8000. | |
965 | Say N otherwise. | |
966 | ||
967 | config X86_REBOOTFIXUPS | |
9ba16087 JB |
968 | bool "Enable X86 board specific fixups for reboot" |
969 | depends on X86_32 | |
506f1d07 SR |
970 | ---help--- |
971 | This enables chipset and/or board specific fixups to be done | |
972 | in order to get reboot to work correctly. This is only needed on | |
973 | some combinations of hardware and BIOS. The symptom, for which | |
974 | this config is intended, is when reboot ends with a stalled/hung | |
975 | system. | |
976 | ||
977 | Currently, the only fixup is for the Geode machines using | |
5e3a77e9 | 978 | CS5530A and CS5536 chipsets and the RDC R-321x SoC. |
506f1d07 SR |
979 | |
980 | Say Y if you want to enable the fixup. Currently, it's safe to | |
981 | enable this option even if you don't need it. | |
982 | Say N otherwise. | |
983 | ||
984 | config MICROCODE | |
e43f6e67 | 985 | tristate "CPU microcode loading support" |
506f1d07 SR |
986 | select FW_LOADER |
987 | ---help--- | |
e43f6e67 | 988 | |
506f1d07 | 989 | If you say Y here, you will be able to update the microcode on |
80cc9f10 | 990 | certain Intel and AMD processors. The Intel support is for the |
e43f6e67 BP |
991 | IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, |
992 | Xeon etc. The AMD support is for families 0x10 and later. You will | |
993 | obviously need the actual microcode binary data itself which is not | |
994 | shipped with the Linux kernel. | |
506f1d07 | 995 | |
8d86f390 PO |
996 | This option selects the general module only, you need to select |
997 | at least one vendor specific module as well. | |
506f1d07 | 998 | |
e43f6e67 BP |
999 | To compile this driver as a module, choose M here: the module |
1000 | will be called microcode. | |
506f1d07 | 1001 | |
8d86f390 | 1002 | config MICROCODE_INTEL |
e43f6e67 | 1003 | bool "Intel microcode loading support" |
8f9ca475 IM |
1004 | depends on MICROCODE |
1005 | default MICROCODE | |
1006 | select FW_LOADER | |
1007 | ---help--- | |
1008 | This options enables microcode patch loading support for Intel | |
1009 | processors. | |
1010 | ||
1011 | For latest news and information on obtaining all the required | |
1012 | Intel ingredients for this driver, check: | |
1013 | <http://www.urbanmyth.org/microcode/>. | |
8d86f390 | 1014 | |
80cc9f10 | 1015 | config MICROCODE_AMD |
e43f6e67 | 1016 | bool "AMD microcode loading support" |
8f9ca475 IM |
1017 | depends on MICROCODE |
1018 | select FW_LOADER | |
1019 | ---help--- | |
1020 | If you select this option, microcode patch loading support for AMD | |
1021 | processors will be enabled. | |
80cc9f10 | 1022 | |
8f9ca475 | 1023 | config MICROCODE_OLD_INTERFACE |
3c2362e6 | 1024 | def_bool y |
506f1d07 | 1025 | depends on MICROCODE |
506f1d07 SR |
1026 | |
1027 | config X86_MSR | |
1028 | tristate "/dev/cpu/*/msr - Model-specific register support" | |
8f9ca475 | 1029 | ---help--- |
506f1d07 SR |
1030 | This device gives privileged processes access to the x86 |
1031 | Model-Specific Registers (MSRs). It is a character device with | |
1032 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. | |
1033 | MSR accesses are directed to a specific CPU on multi-processor | |
1034 | systems. | |
1035 | ||
1036 | config X86_CPUID | |
1037 | tristate "/dev/cpu/*/cpuid - CPU information support" | |
8f9ca475 | 1038 | ---help--- |
506f1d07 SR |
1039 | This device gives processes access to the x86 CPUID instruction to |
1040 | be executed on a specific processor. It is a character device | |
1041 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to | |
1042 | /dev/cpu/31/cpuid. | |
1043 | ||
1044 | choice | |
1045 | prompt "High Memory Support" | |
506f1d07 | 1046 | default HIGHMEM64G if X86_NUMAQ |
6fc108a0 | 1047 | default HIGHMEM4G |
506f1d07 SR |
1048 | depends on X86_32 |
1049 | ||
1050 | config NOHIGHMEM | |
1051 | bool "off" | |
1052 | depends on !X86_NUMAQ | |
1053 | ---help--- | |
1054 | Linux can use up to 64 Gigabytes of physical memory on x86 systems. | |
1055 | However, the address space of 32-bit x86 processors is only 4 | |
1056 | Gigabytes large. That means that, if you have a large amount of | |
1057 | physical memory, not all of it can be "permanently mapped" by the | |
1058 | kernel. The physical memory that's not permanently mapped is called | |
1059 | "high memory". | |
1060 | ||
1061 | If you are compiling a kernel which will never run on a machine with | |
1062 | more than 1 Gigabyte total physical RAM, answer "off" here (default | |
1063 | choice and suitable for most users). This will result in a "3GB/1GB" | |
1064 | split: 3GB are mapped so that each process sees a 3GB virtual memory | |
1065 | space and the remaining part of the 4GB virtual memory space is used | |
1066 | by the kernel to permanently map as much physical memory as | |
1067 | possible. | |
1068 | ||
1069 | If the machine has between 1 and 4 Gigabytes physical RAM, then | |
1070 | answer "4GB" here. | |
1071 | ||
1072 | If more than 4 Gigabytes is used then answer "64GB" here. This | |
1073 | selection turns Intel PAE (Physical Address Extension) mode on. | |
1074 | PAE implements 3-level paging on IA32 processors. PAE is fully | |
1075 | supported by Linux, PAE mode is implemented on all recent Intel | |
1076 | processors (Pentium Pro and better). NOTE: If you say "64GB" here, | |
1077 | then the kernel will not boot on CPUs that don't support PAE! | |
1078 | ||
1079 | The actual amount of total physical memory will either be | |
1080 | auto detected or can be forced by using a kernel command line option | |
1081 | such as "mem=256M". (Try "man bootparam" or see the documentation of | |
1082 | your boot loader (lilo or loadlin) about how to pass options to the | |
1083 | kernel at boot time.) | |
1084 | ||
1085 | If unsure, say "off". | |
1086 | ||
1087 | config HIGHMEM4G | |
1088 | bool "4GB" | |
1089 | depends on !X86_NUMAQ | |
8f9ca475 | 1090 | ---help--- |
506f1d07 SR |
1091 | Select this if you have a 32-bit processor and between 1 and 4 |
1092 | gigabytes of physical RAM. | |
1093 | ||
1094 | config HIGHMEM64G | |
1095 | bool "64GB" | |
1096 | depends on !M386 && !M486 | |
1097 | select X86_PAE | |
8f9ca475 | 1098 | ---help--- |
506f1d07 SR |
1099 | Select this if you have a 32-bit processor and more than 4 |
1100 | gigabytes of physical RAM. | |
1101 | ||
1102 | endchoice | |
1103 | ||
1104 | choice | |
1105 | depends on EXPERIMENTAL | |
6a108a14 | 1106 | prompt "Memory split" if EXPERT |
506f1d07 SR |
1107 | default VMSPLIT_3G |
1108 | depends on X86_32 | |
8f9ca475 | 1109 | ---help--- |
506f1d07 SR |
1110 | Select the desired split between kernel and user memory. |
1111 | ||
1112 | If the address range available to the kernel is less than the | |
1113 | physical memory installed, the remaining memory will be available | |
1114 | as "high memory". Accessing high memory is a little more costly | |
1115 | than low memory, as it needs to be mapped into the kernel first. | |
1116 | Note that increasing the kernel address space limits the range | |
1117 | available to user programs, making the address space there | |
1118 | tighter. Selecting anything other than the default 3G/1G split | |
1119 | will also likely make your kernel incompatible with binary-only | |
1120 | kernel modules. | |
1121 | ||
1122 | If you are not absolutely sure what you are doing, leave this | |
1123 | option alone! | |
1124 | ||
1125 | config VMSPLIT_3G | |
1126 | bool "3G/1G user/kernel split" | |
1127 | config VMSPLIT_3G_OPT | |
1128 | depends on !X86_PAE | |
1129 | bool "3G/1G user/kernel split (for full 1G low memory)" | |
1130 | config VMSPLIT_2G | |
1131 | bool "2G/2G user/kernel split" | |
1132 | config VMSPLIT_2G_OPT | |
1133 | depends on !X86_PAE | |
1134 | bool "2G/2G user/kernel split (for full 2G low memory)" | |
1135 | config VMSPLIT_1G | |
1136 | bool "1G/3G user/kernel split" | |
1137 | endchoice | |
1138 | ||
1139 | config PAGE_OFFSET | |
1140 | hex | |
1141 | default 0xB0000000 if VMSPLIT_3G_OPT | |
1142 | default 0x80000000 if VMSPLIT_2G | |
1143 | default 0x78000000 if VMSPLIT_2G_OPT | |
1144 | default 0x40000000 if VMSPLIT_1G | |
1145 | default 0xC0000000 | |
1146 | depends on X86_32 | |
1147 | ||
1148 | config HIGHMEM | |
3c2362e6 | 1149 | def_bool y |
506f1d07 | 1150 | depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) |
506f1d07 SR |
1151 | |
1152 | config X86_PAE | |
9ba16087 | 1153 | bool "PAE (Physical Address Extension) Support" |
506f1d07 | 1154 | depends on X86_32 && !HIGHMEM4G |
8f9ca475 | 1155 | ---help--- |
506f1d07 SR |
1156 | PAE is required for NX support, and furthermore enables |
1157 | larger swapspace support for non-overcommit purposes. It | |
1158 | has the cost of more pagetable lookup overhead, and also | |
1159 | consumes more pagetable space per process. | |
1160 | ||
600715dc | 1161 | config ARCH_PHYS_ADDR_T_64BIT |
3120e25e JB |
1162 | def_bool y |
1163 | depends on X86_64 || X86_PAE | |
600715dc | 1164 | |
66f2b061 | 1165 | config ARCH_DMA_ADDR_T_64BIT |
3120e25e JB |
1166 | def_bool y |
1167 | depends on X86_64 || HIGHMEM64G | |
66f2b061 | 1168 | |
9e899816 | 1169 | config DIRECT_GBPAGES |
6a108a14 | 1170 | bool "Enable 1GB pages for kernel pagetables" if EXPERT |
9e899816 NP |
1171 | default y |
1172 | depends on X86_64 | |
8f9ca475 | 1173 | ---help--- |
9e899816 NP |
1174 | Allow the kernel linear mapping to use 1GB pages on CPUs that |
1175 | support it. This can improve the kernel's performance a tiny bit by | |
1176 | reducing TLB pressure. If in doubt, say "Y". | |
1177 | ||
506f1d07 SR |
1178 | # Common NUMA Features |
1179 | config NUMA | |
fd51b2d7 | 1180 | bool "Numa Memory Allocation and Scheduler Support" |
506f1d07 | 1181 | depends on SMP |
604d2055 | 1182 | depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL) |
0699eae1 | 1183 | default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP) |
8f9ca475 | 1184 | ---help--- |
506f1d07 | 1185 | Enable NUMA (Non Uniform Memory Access) support. |
fd51b2d7 | 1186 | |
506f1d07 SR |
1187 | The kernel will try to allocate memory used by a CPU on the |
1188 | local memory controller of the CPU and add some more | |
1189 | NUMA awareness to the kernel. | |
1190 | ||
c280ea5e | 1191 | For 64-bit this is recommended if the system is Intel Core i7 |
fd51b2d7 KM |
1192 | (or later), AMD Opteron, or EM64T NUMA. |
1193 | ||
1194 | For 32-bit this is only needed on (rare) 32-bit-only platforms | |
1195 | that support NUMA topologies, such as NUMAQ / Summit, or if you | |
1196 | boot a 32-bit kernel on a 64-bit NUMA platform. | |
1197 | ||
1198 | Otherwise, you should say N. | |
506f1d07 SR |
1199 | |
1200 | comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI" | |
1201 | depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI) | |
1202 | ||
eec1d4fa | 1203 | config AMD_NUMA |
3c2362e6 HH |
1204 | def_bool y |
1205 | prompt "Old style AMD Opteron NUMA detection" | |
5da0ef9a | 1206 | depends on X86_64 && NUMA && PCI |
8f9ca475 | 1207 | ---help--- |
eec1d4fa HR |
1208 | Enable AMD NUMA node topology detection. You should say Y here if |
1209 | you have a multi processor AMD system. This uses an old method to | |
1210 | read the NUMA configuration directly from the builtin Northbridge | |
1211 | of Opteron. It is recommended to use X86_64_ACPI_NUMA instead, | |
1212 | which also takes priority if both are compiled in. | |
506f1d07 SR |
1213 | |
1214 | config X86_64_ACPI_NUMA | |
3c2362e6 HH |
1215 | def_bool y |
1216 | prompt "ACPI NUMA detection" | |
506f1d07 SR |
1217 | depends on X86_64 && NUMA && ACPI && PCI |
1218 | select ACPI_NUMA | |
8f9ca475 | 1219 | ---help--- |
506f1d07 SR |
1220 | Enable ACPI SRAT based node topology detection. |
1221 | ||
6ec6e0d9 SS |
1222 | # Some NUMA nodes have memory ranges that span |
1223 | # other nodes. Even though a pfn is valid and | |
1224 | # between a node's start and end pfns, it may not | |
1225 | # reside on that node. See memmap_init_zone() | |
1226 | # for details. | |
1227 | config NODES_SPAN_OTHER_NODES | |
1228 | def_bool y | |
1229 | depends on X86_64_ACPI_NUMA | |
1230 | ||
506f1d07 SR |
1231 | config NUMA_EMU |
1232 | bool "NUMA emulation" | |
1b7e03ef | 1233 | depends on NUMA |
8f9ca475 | 1234 | ---help--- |
506f1d07 SR |
1235 | Enable NUMA emulation. A flat machine will be split |
1236 | into virtual nodes when booted with "numa=fake=N", where N is the | |
1237 | number of nodes. This is only useful for debugging. | |
1238 | ||
1239 | config NODES_SHIFT | |
d25e26b6 | 1240 | int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP |
51591e31 DR |
1241 | range 1 10 |
1242 | default "10" if MAXSMP | |
506f1d07 SR |
1243 | default "6" if X86_64 |
1244 | default "4" if X86_NUMAQ | |
1245 | default "3" | |
1246 | depends on NEED_MULTIPLE_NODES | |
8f9ca475 | 1247 | ---help--- |
1184dc2f | 1248 | Specify the maximum number of NUMA Nodes available on the target |
692105b8 | 1249 | system. Increases memory reserved to accommodate various tables. |
506f1d07 | 1250 | |
3b16651f TH |
1251 | config HAVE_ARCH_ALLOC_REMAP |
1252 | def_bool y | |
1253 | depends on X86_32 && NUMA | |
1254 | ||
506f1d07 | 1255 | config ARCH_HAVE_MEMORY_PRESENT |
3c2362e6 | 1256 | def_bool y |
506f1d07 | 1257 | depends on X86_32 && DISCONTIGMEM |
506f1d07 SR |
1258 | |
1259 | config NEED_NODE_MEMMAP_SIZE | |
3c2362e6 | 1260 | def_bool y |
506f1d07 | 1261 | depends on X86_32 && (DISCONTIGMEM || SPARSEMEM) |
506f1d07 | 1262 | |
506f1d07 SR |
1263 | config ARCH_FLATMEM_ENABLE |
1264 | def_bool y | |
3b16651f | 1265 | depends on X86_32 && !NUMA |
506f1d07 SR |
1266 | |
1267 | config ARCH_DISCONTIGMEM_ENABLE | |
1268 | def_bool y | |
b263295d | 1269 | depends on NUMA && X86_32 |
506f1d07 SR |
1270 | |
1271 | config ARCH_DISCONTIGMEM_DEFAULT | |
1272 | def_bool y | |
b263295d CL |
1273 | depends on NUMA && X86_32 |
1274 | ||
506f1d07 SR |
1275 | config ARCH_SPARSEMEM_ENABLE |
1276 | def_bool y | |
4272ebfb | 1277 | depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD |
506f1d07 SR |
1278 | select SPARSEMEM_STATIC if X86_32 |
1279 | select SPARSEMEM_VMEMMAP_ENABLE if X86_64 | |
1280 | ||
3b16651f TH |
1281 | config ARCH_SPARSEMEM_DEFAULT |
1282 | def_bool y | |
1283 | depends on X86_64 | |
1284 | ||
506f1d07 SR |
1285 | config ARCH_SELECT_MEMORY_MODEL |
1286 | def_bool y | |
b263295d | 1287 | depends on ARCH_SPARSEMEM_ENABLE |
506f1d07 SR |
1288 | |
1289 | config ARCH_MEMORY_PROBE | |
3120e25e JB |
1290 | def_bool y |
1291 | depends on X86_64 && MEMORY_HOTPLUG | |
506f1d07 | 1292 | |
3b16651f TH |
1293 | config ARCH_PROC_KCORE_TEXT |
1294 | def_bool y | |
1295 | depends on X86_64 && PROC_KCORE | |
1296 | ||
a29815a3 AK |
1297 | config ILLEGAL_POINTER_VALUE |
1298 | hex | |
1299 | default 0 if X86_32 | |
1300 | default 0xdead000000000000 if X86_64 | |
1301 | ||
506f1d07 SR |
1302 | source "mm/Kconfig" |
1303 | ||
1304 | config HIGHPTE | |
1305 | bool "Allocate 3rd-level pagetables from highmem" | |
6fc108a0 | 1306 | depends on HIGHMEM |
8f9ca475 | 1307 | ---help--- |
506f1d07 SR |
1308 | The VM uses one page table entry for each page of physical memory. |
1309 | For systems with a lot of RAM, this can be wasteful of precious | |
1310 | low memory. Setting this option will put user-space page table | |
1311 | entries in high memory. | |
1312 | ||
9f077871 | 1313 | config X86_CHECK_BIOS_CORRUPTION |
8f9ca475 IM |
1314 | bool "Check for low memory corruption" |
1315 | ---help--- | |
1316 | Periodically check for memory corruption in low memory, which | |
1317 | is suspected to be caused by BIOS. Even when enabled in the | |
1318 | configuration, it is disabled at runtime. Enable it by | |
1319 | setting "memory_corruption_check=1" on the kernel command | |
1320 | line. By default it scans the low 64k of memory every 60 | |
1321 | seconds; see the memory_corruption_check_size and | |
1322 | memory_corruption_check_period parameters in | |
1323 | Documentation/kernel-parameters.txt to adjust this. | |
1324 | ||
1325 | When enabled with the default parameters, this option has | |
1326 | almost no overhead, as it reserves a relatively small amount | |
1327 | of memory and scans it infrequently. It both detects corruption | |
1328 | and prevents it from affecting the running system. | |
1329 | ||
1330 | It is, however, intended as a diagnostic tool; if repeatable | |
1331 | BIOS-originated corruption always affects the same memory, | |
1332 | you can use memmap= to prevent the kernel from using that | |
1333 | memory. | |
9f077871 | 1334 | |
c885df50 | 1335 | config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK |
8f9ca475 | 1336 | bool "Set the default setting of memory_corruption_check" |
c885df50 JF |
1337 | depends on X86_CHECK_BIOS_CORRUPTION |
1338 | default y | |
8f9ca475 IM |
1339 | ---help--- |
1340 | Set whether the default state of memory_corruption_check is | |
1341 | on or off. | |
c885df50 | 1342 | |
9ea77bdb | 1343 | config X86_RESERVE_LOW |
d0cd7425 PA |
1344 | int "Amount of low memory, in kilobytes, to reserve for the BIOS" |
1345 | default 64 | |
1346 | range 4 640 | |
8f9ca475 | 1347 | ---help--- |
d0cd7425 PA |
1348 | Specify the amount of low memory to reserve for the BIOS. |
1349 | ||
1350 | The first page contains BIOS data structures that the kernel | |
1351 | must not use, so that page must always be reserved. | |
1352 | ||
1353 | By default we reserve the first 64K of physical RAM, as a | |
1354 | number of BIOSes are known to corrupt that memory range | |
1355 | during events such as suspend/resume or monitor cable | |
1356 | insertion, so it must not be used by the kernel. | |
fc381519 | 1357 | |
d0cd7425 PA |
1358 | You can set this to 4 if you are absolutely sure that you |
1359 | trust the BIOS to get all its memory reservations and usages | |
1360 | right. If you know your BIOS have problems beyond the | |
1361 | default 64K area, you can set this to 640 to avoid using the | |
1362 | entire low memory range. | |
fc381519 | 1363 | |
d0cd7425 PA |
1364 | If you have doubts about the BIOS (e.g. suspend/resume does |
1365 | not work or there's kernel crashes after certain hardware | |
1366 | hotplug events) then you might want to enable | |
1367 | X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check | |
1368 | typical corruption patterns. | |
fc381519 | 1369 | |
d0cd7425 | 1370 | Leave this to the default value of 64 if you are unsure. |
fc381519 | 1371 | |
506f1d07 SR |
1372 | config MATH_EMULATION |
1373 | bool | |
1374 | prompt "Math emulation" if X86_32 | |
1375 | ---help--- | |
1376 | Linux can emulate a math coprocessor (used for floating point | |
1377 | operations) if you don't have one. 486DX and Pentium processors have | |
1378 | a math coprocessor built in, 486SX and 386 do not, unless you added | |
1379 | a 487DX or 387, respectively. (The messages during boot time can | |
1380 | give you some hints here ["man dmesg"].) Everyone needs either a | |
1381 | coprocessor or this emulation. | |
1382 | ||
1383 | If you don't have a math coprocessor, you need to say Y here; if you | |
1384 | say Y here even though you have a coprocessor, the coprocessor will | |
1385 | be used nevertheless. (This behavior can be changed with the kernel | |
1386 | command line option "no387", which comes handy if your coprocessor | |
1387 | is broken. Try "man bootparam" or see the documentation of your boot | |
1388 | loader (lilo or loadlin) about how to pass options to the kernel at | |
1389 | boot time.) This means that it is a good idea to say Y here if you | |
1390 | intend to use this kernel on different machines. | |
1391 | ||
1392 | More information about the internals of the Linux math coprocessor | |
1393 | emulation can be found in <file:arch/x86/math-emu/README>. | |
1394 | ||
1395 | If you are not sure, say Y; apart from resulting in a 66 KB bigger | |
1396 | kernel, it won't hurt. | |
1397 | ||
1398 | config MTRR | |
6fc108a0 | 1399 | def_bool y |
6a108a14 | 1400 | prompt "MTRR (Memory Type Range Register) support" if EXPERT |
506f1d07 SR |
1401 | ---help--- |
1402 | On Intel P6 family processors (Pentium Pro, Pentium II and later) | |
1403 | the Memory Type Range Registers (MTRRs) may be used to control | |
1404 | processor access to memory ranges. This is most useful if you have | |
1405 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining | |
1406 | allows bus write transfers to be combined into a larger transfer | |
1407 | before bursting over the PCI/AGP bus. This can increase performance | |
1408 | of image write operations 2.5 times or more. Saying Y here creates a | |
1409 | /proc/mtrr file which may be used to manipulate your processor's | |
1410 | MTRRs. Typically the X server should use this. | |
1411 | ||
1412 | This code has a reasonably generic interface so that similar | |
1413 | control registers on other processors can be easily supported | |
1414 | as well: | |
1415 | ||
1416 | The Cyrix 6x86, 6x86MX and M II processors have Address Range | |
1417 | Registers (ARRs) which provide a similar functionality to MTRRs. For | |
1418 | these, the ARRs are used to emulate the MTRRs. | |
1419 | The AMD K6-2 (stepping 8 and above) and K6-3 processors have two | |
1420 | MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing | |
1421 | write-combining. All of these processors are supported by this code | |
1422 | and it makes sense to say Y here if you have one of them. | |
1423 | ||
1424 | Saying Y here also fixes a problem with buggy SMP BIOSes which only | |
1425 | set the MTRRs for the boot CPU and not for the secondary CPUs. This | |
1426 | can lead to all sorts of problems, so it's good to say Y here. | |
1427 | ||
1428 | You can safely say Y even if your machine doesn't have MTRRs, you'll | |
1429 | just add about 9 KB to your kernel. | |
1430 | ||
7225e751 | 1431 | See <file:Documentation/x86/mtrr.txt> for more information. |
506f1d07 | 1432 | |
95ffa243 | 1433 | config MTRR_SANITIZER |
2ffb3501 | 1434 | def_bool y |
95ffa243 YL |
1435 | prompt "MTRR cleanup support" |
1436 | depends on MTRR | |
8f9ca475 | 1437 | ---help--- |
aba3728c TG |
1438 | Convert MTRR layout from continuous to discrete, so X drivers can |
1439 | add writeback entries. | |
95ffa243 | 1440 | |
aba3728c | 1441 | Can be disabled with disable_mtrr_cleanup on the kernel command line. |
692105b8 | 1442 | The largest mtrr entry size for a continuous block can be set with |
aba3728c | 1443 | mtrr_chunk_size. |
95ffa243 | 1444 | |
2ffb3501 | 1445 | If unsure, say Y. |
95ffa243 YL |
1446 | |
1447 | config MTRR_SANITIZER_ENABLE_DEFAULT | |
f5098d62 YL |
1448 | int "MTRR cleanup enable value (0-1)" |
1449 | range 0 1 | |
1450 | default "0" | |
95ffa243 | 1451 | depends on MTRR_SANITIZER |
8f9ca475 | 1452 | ---help--- |
f5098d62 | 1453 | Enable mtrr cleanup default value |
95ffa243 | 1454 | |
12031a62 YL |
1455 | config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT |
1456 | int "MTRR cleanup spare reg num (0-7)" | |
1457 | range 0 7 | |
1458 | default "1" | |
1459 | depends on MTRR_SANITIZER | |
8f9ca475 | 1460 | ---help--- |
12031a62 | 1461 | mtrr cleanup spare entries default, it can be changed via |
aba3728c | 1462 | mtrr_spare_reg_nr=N on the kernel command line. |
12031a62 | 1463 | |
2e5d9c85 | 1464 | config X86_PAT |
6fc108a0 | 1465 | def_bool y |
6a108a14 | 1466 | prompt "x86 PAT support" if EXPERT |
2a8a2719 | 1467 | depends on MTRR |
8f9ca475 | 1468 | ---help--- |
2e5d9c85 | 1469 | Use PAT attributes to setup page level cache control. |
042b78e4 | 1470 | |
2e5d9c85 | 1471 | PATs are the modern equivalents of MTRRs and are much more |
1472 | flexible than MTRRs. | |
1473 | ||
1474 | Say N here if you see bootup problems (boot crash, boot hang, | |
042b78e4 | 1475 | spontaneous reboots) or a non-working video driver. |
2e5d9c85 | 1476 | |
1477 | If unsure, say Y. | |
1478 | ||
46cf98cd VP |
1479 | config ARCH_USES_PG_UNCACHED |
1480 | def_bool y | |
1481 | depends on X86_PAT | |
1482 | ||
628c6246 PA |
1483 | config ARCH_RANDOM |
1484 | def_bool y | |
1485 | prompt "x86 architectural random number generator" if EXPERT | |
1486 | ---help--- | |
1487 | Enable the x86 architectural RDRAND instruction | |
1488 | (Intel Bull Mountain technology) to generate random numbers. | |
1489 | If supported, this is a high bandwidth, cryptographically | |
1490 | secure hardware random number generator. | |
1491 | ||
51ae4a2d PA |
1492 | config X86_SMAP |
1493 | def_bool y | |
1494 | prompt "Supervisor Mode Access Prevention" if EXPERT | |
1495 | ---help--- | |
1496 | Supervisor Mode Access Prevention (SMAP) is a security | |
1497 | feature in newer Intel processors. There is a small | |
1498 | performance cost if this enabled and turned on; there is | |
1499 | also a small increase in the kernel size if this is enabled. | |
1500 | ||
1501 | If unsure, say Y. | |
1502 | ||
506f1d07 | 1503 | config EFI |
9ba16087 | 1504 | bool "EFI runtime service support" |
5b83683f | 1505 | depends on ACPI |
506f1d07 | 1506 | ---help--- |
8f9ca475 IM |
1507 | This enables the kernel to use EFI runtime services that are |
1508 | available (such as the EFI variable services). | |
506f1d07 | 1509 | |
8f9ca475 IM |
1510 | This option is only useful on systems that have EFI firmware. |
1511 | In addition, you should use the latest ELILO loader available | |
1512 | at <http://elilo.sourceforge.net> in order to take advantage | |
1513 | of EFI runtime services. However, even with this option, the | |
1514 | resultant kernel should continue to boot on existing non-EFI | |
1515 | platforms. | |
506f1d07 | 1516 | |
291f3632 MF |
1517 | config EFI_STUB |
1518 | bool "EFI stub support" | |
1519 | depends on EFI | |
1520 | ---help--- | |
1521 | This kernel feature allows a bzImage to be loaded directly | |
1522 | by EFI firmware without the use of a bootloader. | |
1523 | ||
0c759662 MF |
1524 | See Documentation/x86/efi-stub.txt for more information. |
1525 | ||
506f1d07 | 1526 | config SECCOMP |
3c2362e6 HH |
1527 | def_bool y |
1528 | prompt "Enable seccomp to safely compute untrusted bytecode" | |
8f9ca475 | 1529 | ---help--- |
506f1d07 SR |
1530 | This kernel feature is useful for number crunching applications |
1531 | that may need to compute untrusted bytecode during their | |
1532 | execution. By using pipes or other transports made available to | |
1533 | the process as file descriptors supporting the read/write | |
1534 | syscalls, it's possible to isolate those applications in | |
1535 | their own address space using seccomp. Once seccomp is | |
9c0bbee8 | 1536 | enabled via prctl(PR_SET_SECCOMP), it cannot be disabled |
506f1d07 SR |
1537 | and the task is only allowed to execute a few safe syscalls |
1538 | defined by each seccomp mode. | |
1539 | ||
1540 | If unsure, say Y. Only embedded should say N here. | |
1541 | ||
1542 | config CC_STACKPROTECTOR | |
2a8ac745 | 1543 | bool "Enable -fstack-protector buffer overflow detection" |
8f9ca475 IM |
1544 | ---help--- |
1545 | This option turns on the -fstack-protector GCC feature. This | |
113c5413 IM |
1546 | feature puts, at the beginning of functions, a canary value on |
1547 | the stack just before the return address, and validates | |
506f1d07 SR |
1548 | the value just before actually returning. Stack based buffer |
1549 | overflows (that need to overwrite this return address) now also | |
1550 | overwrite the canary, which gets detected and the attack is then | |
1551 | neutralized via a kernel panic. | |
1552 | ||
1553 | This feature requires gcc version 4.2 or above, or a distribution | |
1554 | gcc with the feature backported. Older versions are automatically | |
113c5413 IM |
1555 | detected and for those versions, this configuration option is |
1556 | ignored. (and a warning is printed during bootup) | |
506f1d07 SR |
1557 | |
1558 | source kernel/Kconfig.hz | |
1559 | ||
1560 | config KEXEC | |
1561 | bool "kexec system call" | |
8f9ca475 | 1562 | ---help--- |
506f1d07 SR |
1563 | kexec is a system call that implements the ability to shutdown your |
1564 | current kernel, and to start another kernel. It is like a reboot | |
1565 | but it is independent of the system firmware. And like a reboot | |
1566 | you can start any kernel with it, not just Linux. | |
1567 | ||
1568 | The name comes from the similarity to the exec system call. | |
1569 | ||
1570 | It is an ongoing process to be certain the hardware in a machine | |
1571 | is properly shutdown, so do not be surprised if this code does not | |
1572 | initially work for you. It may help to enable device hotplugging | |
1573 | support. As of this writing the exact hardware interface is | |
1574 | strongly in flux, so no good recommendation can be made. | |
1575 | ||
1576 | config CRASH_DUMP | |
04b69447 | 1577 | bool "kernel crash dumps" |
506f1d07 | 1578 | depends on X86_64 || (X86_32 && HIGHMEM) |
8f9ca475 | 1579 | ---help--- |
506f1d07 SR |
1580 | Generate crash dump after being started by kexec. |
1581 | This should be normally only set in special crash dump kernels | |
1582 | which are loaded in the main kernel with kexec-tools into | |
1583 | a specially reserved region and then later executed after | |
1584 | a crash by kdump/kexec. The crash dump kernel must be compiled | |
1585 | to a memory address not used by the main kernel or BIOS using | |
1586 | PHYSICAL_START, or it must be built as a relocatable image | |
1587 | (CONFIG_RELOCATABLE=y). | |
1588 | For more details see Documentation/kdump/kdump.txt | |
1589 | ||
3ab83521 HY |
1590 | config KEXEC_JUMP |
1591 | bool "kexec jump (EXPERIMENTAL)" | |
1592 | depends on EXPERIMENTAL | |
fee7b0d8 | 1593 | depends on KEXEC && HIBERNATION |
8f9ca475 | 1594 | ---help--- |
89081d17 HY |
1595 | Jump between original kernel and kexeced kernel and invoke |
1596 | code in physical address mode via KEXEC | |
3ab83521 | 1597 | |
506f1d07 | 1598 | config PHYSICAL_START |
6a108a14 | 1599 | hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP) |
ceefccc9 | 1600 | default "0x1000000" |
8f9ca475 | 1601 | ---help--- |
506f1d07 SR |
1602 | This gives the physical address where the kernel is loaded. |
1603 | ||
1604 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then | |
1605 | bzImage will decompress itself to above physical address and | |
1606 | run from there. Otherwise, bzImage will run from the address where | |
1607 | it has been loaded by the boot loader and will ignore above physical | |
1608 | address. | |
1609 | ||
1610 | In normal kdump cases one does not have to set/change this option | |
1611 | as now bzImage can be compiled as a completely relocatable image | |
1612 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different | |
1613 | address. This option is mainly useful for the folks who don't want | |
1614 | to use a bzImage for capturing the crash dump and want to use a | |
1615 | vmlinux instead. vmlinux is not relocatable hence a kernel needs | |
1616 | to be specifically compiled to run from a specific memory area | |
1617 | (normally a reserved region) and this option comes handy. | |
1618 | ||
ceefccc9 PA |
1619 | So if you are using bzImage for capturing the crash dump, |
1620 | leave the value here unchanged to 0x1000000 and set | |
1621 | CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux | |
1622 | for capturing the crash dump change this value to start of | |
1623 | the reserved region. In other words, it can be set based on | |
1624 | the "X" value as specified in the "crashkernel=YM@XM" | |
1625 | command line boot parameter passed to the panic-ed | |
1626 | kernel. Please take a look at Documentation/kdump/kdump.txt | |
1627 | for more details about crash dumps. | |
506f1d07 SR |
1628 | |
1629 | Usage of bzImage for capturing the crash dump is recommended as | |
1630 | one does not have to build two kernels. Same kernel can be used | |
1631 | as production kernel and capture kernel. Above option should have | |
1632 | gone away after relocatable bzImage support is introduced. But it | |
1633 | is present because there are users out there who continue to use | |
1634 | vmlinux for dump capture. This option should go away down the | |
1635 | line. | |
1636 | ||
1637 | Don't change this unless you know what you are doing. | |
1638 | ||
1639 | config RELOCATABLE | |
26717808 PA |
1640 | bool "Build a relocatable kernel" |
1641 | default y | |
8f9ca475 | 1642 | ---help--- |
506f1d07 SR |
1643 | This builds a kernel image that retains relocation information |
1644 | so it can be loaded someplace besides the default 1MB. | |
1645 | The relocations tend to make the kernel binary about 10% larger, | |
1646 | but are discarded at runtime. | |
1647 | ||
1648 | One use is for the kexec on panic case where the recovery kernel | |
1649 | must live at a different physical address than the primary | |
1650 | kernel. | |
1651 | ||
1652 | Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address | |
1653 | it has been loaded at and the compile time physical address | |
1654 | (CONFIG_PHYSICAL_START) is ignored. | |
1655 | ||
845adf72 PA |
1656 | # Relocation on x86-32 needs some additional build support |
1657 | config X86_NEED_RELOCS | |
1658 | def_bool y | |
1659 | depends on X86_32 && RELOCATABLE | |
1660 | ||
506f1d07 | 1661 | config PHYSICAL_ALIGN |
6fc108a0 | 1662 | hex "Alignment value to which kernel should be aligned" if X86_32 |
ceefccc9 PA |
1663 | default "0x1000000" |
1664 | range 0x2000 0x1000000 | |
8f9ca475 | 1665 | ---help--- |
506f1d07 SR |
1666 | This value puts the alignment restrictions on physical address |
1667 | where kernel is loaded and run from. Kernel is compiled for an | |
1668 | address which meets above alignment restriction. | |
1669 | ||
1670 | If bootloader loads the kernel at a non-aligned address and | |
1671 | CONFIG_RELOCATABLE is set, kernel will move itself to nearest | |
1672 | address aligned to above value and run from there. | |
1673 | ||
1674 | If bootloader loads the kernel at a non-aligned address and | |
1675 | CONFIG_RELOCATABLE is not set, kernel will ignore the run time | |
1676 | load address and decompress itself to the address it has been | |
1677 | compiled for and run from there. The address for which kernel is | |
1678 | compiled already meets above alignment restrictions. Hence the | |
1679 | end result is that kernel runs from a physical address meeting | |
1680 | above alignment restrictions. | |
1681 | ||
1682 | Don't change this unless you know what you are doing. | |
1683 | ||
1684 | config HOTPLUG_CPU | |
7c13e6a3 | 1685 | bool "Support for hot-pluggable CPUs" |
4b19ed91 | 1686 | depends on SMP && HOTPLUG |
506f1d07 | 1687 | ---help--- |
7c13e6a3 DS |
1688 | Say Y here to allow turning CPUs off and on. CPUs can be |
1689 | controlled through /sys/devices/system/cpu. | |
1690 | ( Note: power management support will enable this option | |
1691 | automatically on SMP systems. ) | |
1692 | Say N if you want to disable CPU hotplug. | |
506f1d07 SR |
1693 | |
1694 | config COMPAT_VDSO | |
3c2362e6 HH |
1695 | def_bool y |
1696 | prompt "Compat VDSO support" | |
af65d648 | 1697 | depends on X86_32 || IA32_EMULATION |
8f9ca475 | 1698 | ---help--- |
af65d648 | 1699 | Map the 32-bit VDSO to the predictable old-style address too. |
e84446de | 1700 | |
506f1d07 SR |
1701 | Say N here if you are running a sufficiently recent glibc |
1702 | version (2.3.3 or later), to remove the high-mapped | |
1703 | VDSO mapping and to exclusively use the randomized VDSO. | |
1704 | ||
1705 | If unsure, say Y. | |
1706 | ||
516cbf37 TB |
1707 | config CMDLINE_BOOL |
1708 | bool "Built-in kernel command line" | |
8f9ca475 | 1709 | ---help--- |
516cbf37 TB |
1710 | Allow for specifying boot arguments to the kernel at |
1711 | build time. On some systems (e.g. embedded ones), it is | |
1712 | necessary or convenient to provide some or all of the | |
1713 | kernel boot arguments with the kernel itself (that is, | |
1714 | to not rely on the boot loader to provide them.) | |
1715 | ||
1716 | To compile command line arguments into the kernel, | |
1717 | set this option to 'Y', then fill in the | |
1718 | the boot arguments in CONFIG_CMDLINE. | |
1719 | ||
1720 | Systems with fully functional boot loaders (i.e. non-embedded) | |
1721 | should leave this option set to 'N'. | |
1722 | ||
1723 | config CMDLINE | |
1724 | string "Built-in kernel command string" | |
1725 | depends on CMDLINE_BOOL | |
1726 | default "" | |
8f9ca475 | 1727 | ---help--- |
516cbf37 TB |
1728 | Enter arguments here that should be compiled into the kernel |
1729 | image and used at boot time. If the boot loader provides a | |
1730 | command line at boot time, it is appended to this string to | |
1731 | form the full kernel command line, when the system boots. | |
1732 | ||
1733 | However, you can use the CONFIG_CMDLINE_OVERRIDE option to | |
1734 | change this behavior. | |
1735 | ||
1736 | In most cases, the command line (whether built-in or provided | |
1737 | by the boot loader) should specify the device for the root | |
1738 | file system. | |
1739 | ||
1740 | config CMDLINE_OVERRIDE | |
1741 | bool "Built-in command line overrides boot loader arguments" | |
516cbf37 | 1742 | depends on CMDLINE_BOOL |
8f9ca475 | 1743 | ---help--- |
516cbf37 TB |
1744 | Set this option to 'Y' to have the kernel ignore the boot loader |
1745 | command line, and use ONLY the built-in command line. | |
1746 | ||
1747 | This is used to work around broken boot loaders. This should | |
1748 | be set to 'N' under normal conditions. | |
1749 | ||
506f1d07 SR |
1750 | endmenu |
1751 | ||
1752 | config ARCH_ENABLE_MEMORY_HOTPLUG | |
1753 | def_bool y | |
1754 | depends on X86_64 || (X86_32 && HIGHMEM) | |
1755 | ||
35551053 GH |
1756 | config ARCH_ENABLE_MEMORY_HOTREMOVE |
1757 | def_bool y | |
1758 | depends on MEMORY_HOTPLUG | |
1759 | ||
e534c7c5 | 1760 | config USE_PERCPU_NUMA_NODE_ID |
645a7919 | 1761 | def_bool y |
e534c7c5 LS |
1762 | depends on NUMA |
1763 | ||
da85f865 | 1764 | menu "Power management and ACPI options" |
e279b6c1 SR |
1765 | |
1766 | config ARCH_HIBERNATION_HEADER | |
3c2362e6 | 1767 | def_bool y |
e279b6c1 | 1768 | depends on X86_64 && HIBERNATION |
e279b6c1 SR |
1769 | |
1770 | source "kernel/power/Kconfig" | |
1771 | ||
1772 | source "drivers/acpi/Kconfig" | |
1773 | ||
efafc8b2 FT |
1774 | source "drivers/sfi/Kconfig" |
1775 | ||
a6b68076 | 1776 | config X86_APM_BOOT |
6fc108a0 | 1777 | def_bool y |
282e5aab | 1778 | depends on APM |
a6b68076 | 1779 | |
e279b6c1 SR |
1780 | menuconfig APM |
1781 | tristate "APM (Advanced Power Management) BIOS support" | |
efefa6f6 | 1782 | depends on X86_32 && PM_SLEEP |
e279b6c1 SR |
1783 | ---help--- |
1784 | APM is a BIOS specification for saving power using several different | |
1785 | techniques. This is mostly useful for battery powered laptops with | |
1786 | APM compliant BIOSes. If you say Y here, the system time will be | |
1787 | reset after a RESUME operation, the /proc/apm device will provide | |
1788 | battery status information, and user-space programs will receive | |
1789 | notification of APM "events" (e.g. battery status change). | |
1790 | ||
1791 | If you select "Y" here, you can disable actual use of the APM | |
1792 | BIOS by passing the "apm=off" option to the kernel at boot time. | |
1793 | ||
1794 | Note that the APM support is almost completely disabled for | |
1795 | machines with more than one CPU. | |
1796 | ||
1797 | In order to use APM, you will need supporting software. For location | |
2dc98fd3 MW |
1798 | and more information, read <file:Documentation/power/apm-acpi.txt> |
1799 | and the Battery Powered Linux mini-HOWTO, available from | |
e279b6c1 SR |
1800 | <http://www.tldp.org/docs.html#howto>. |
1801 | ||
1802 | This driver does not spin down disk drives (see the hdparm(8) | |
1803 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
1804 | VESA-compliant "green" monitors. | |
1805 | ||
1806 | This driver does not support the TI 4000M TravelMate and the ACER | |
1807 | 486/DX4/75 because they don't have compliant BIOSes. Many "green" | |
1808 | desktop machines also don't have compliant BIOSes, and this driver | |
1809 | may cause those machines to panic during the boot phase. | |
1810 | ||
1811 | Generally, if you don't have a battery in your machine, there isn't | |
1812 | much point in using this driver and you should say N. If you get | |
1813 | random kernel OOPSes or reboots that don't seem to be related to | |
1814 | anything, try disabling/enabling this option (or disabling/enabling | |
1815 | APM in your BIOS). | |
1816 | ||
1817 | Some other things you should try when experiencing seemingly random, | |
1818 | "weird" problems: | |
1819 | ||
1820 | 1) make sure that you have enough swap space and that it is | |
1821 | enabled. | |
1822 | 2) pass the "no-hlt" option to the kernel | |
1823 | 3) switch on floating point emulation in the kernel and pass | |
1824 | the "no387" option to the kernel | |
1825 | 4) pass the "floppy=nodma" option to the kernel | |
1826 | 5) pass the "mem=4M" option to the kernel (thereby disabling | |
1827 | all but the first 4 MB of RAM) | |
1828 | 6) make sure that the CPU is not over clocked. | |
1829 | 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> | |
1830 | 8) disable the cache from your BIOS settings | |
1831 | 9) install a fan for the video card or exchange video RAM | |
1832 | 10) install a better fan for the CPU | |
1833 | 11) exchange RAM chips | |
1834 | 12) exchange the motherboard. | |
1835 | ||
1836 | To compile this driver as a module, choose M here: the | |
1837 | module will be called apm. | |
1838 | ||
1839 | if APM | |
1840 | ||
1841 | config APM_IGNORE_USER_SUSPEND | |
1842 | bool "Ignore USER SUSPEND" | |
8f9ca475 | 1843 | ---help--- |
e279b6c1 SR |
1844 | This option will ignore USER SUSPEND requests. On machines with a |
1845 | compliant APM BIOS, you want to say N. However, on the NEC Versa M | |
1846 | series notebooks, it is necessary to say Y because of a BIOS bug. | |
1847 | ||
1848 | config APM_DO_ENABLE | |
1849 | bool "Enable PM at boot time" | |
1850 | ---help--- | |
1851 | Enable APM features at boot time. From page 36 of the APM BIOS | |
1852 | specification: "When disabled, the APM BIOS does not automatically | |
1853 | power manage devices, enter the Standby State, enter the Suspend | |
1854 | State, or take power saving steps in response to CPU Idle calls." | |
1855 | This driver will make CPU Idle calls when Linux is idle (unless this | |
1856 | feature is turned off -- see "Do CPU IDLE calls", below). This | |
1857 | should always save battery power, but more complicated APM features | |
1858 | will be dependent on your BIOS implementation. You may need to turn | |
1859 | this option off if your computer hangs at boot time when using APM | |
1860 | support, or if it beeps continuously instead of suspending. Turn | |
1861 | this off if you have a NEC UltraLite Versa 33/C or a Toshiba | |
1862 | T400CDT. This is off by default since most machines do fine without | |
1863 | this feature. | |
1864 | ||
1865 | config APM_CPU_IDLE | |
1866 | bool "Make CPU Idle calls when idle" | |
8f9ca475 | 1867 | ---help--- |
e279b6c1 SR |
1868 | Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. |
1869 | On some machines, this can activate improved power savings, such as | |
1870 | a slowed CPU clock rate, when the machine is idle. These idle calls | |
1871 | are made after the idle loop has run for some length of time (e.g., | |
1872 | 333 mS). On some machines, this will cause a hang at boot time or | |
1873 | whenever the CPU becomes idle. (On machines with more than one CPU, | |
1874 | this option does nothing.) | |
1875 | ||
1876 | config APM_DISPLAY_BLANK | |
1877 | bool "Enable console blanking using APM" | |
8f9ca475 | 1878 | ---help--- |
e279b6c1 SR |
1879 | Enable console blanking using the APM. Some laptops can use this to |
1880 | turn off the LCD backlight when the screen blanker of the Linux | |
1881 | virtual console blanks the screen. Note that this is only used by | |
1882 | the virtual console screen blanker, and won't turn off the backlight | |
1883 | when using the X Window system. This also doesn't have anything to | |
1884 | do with your VESA-compliant power-saving monitor. Further, this | |
1885 | option doesn't work for all laptops -- it might not turn off your | |
1886 | backlight at all, or it might print a lot of errors to the console, | |
1887 | especially if you are using gpm. | |
1888 | ||
1889 | config APM_ALLOW_INTS | |
1890 | bool "Allow interrupts during APM BIOS calls" | |
8f9ca475 | 1891 | ---help--- |
e279b6c1 SR |
1892 | Normally we disable external interrupts while we are making calls to |
1893 | the APM BIOS as a measure to lessen the effects of a badly behaving | |
1894 | BIOS implementation. The BIOS should reenable interrupts if it | |
1895 | needs to. Unfortunately, some BIOSes do not -- especially those in | |
1896 | many of the newer IBM Thinkpads. If you experience hangs when you | |
1897 | suspend, try setting this to Y. Otherwise, say N. | |
1898 | ||
e279b6c1 SR |
1899 | endif # APM |
1900 | ||
bb0a56ec | 1901 | source "drivers/cpufreq/Kconfig" |
e279b6c1 SR |
1902 | |
1903 | source "drivers/cpuidle/Kconfig" | |
1904 | ||
27471fdb AH |
1905 | source "drivers/idle/Kconfig" |
1906 | ||
e279b6c1 SR |
1907 | endmenu |
1908 | ||
1909 | ||
1910 | menu "Bus options (PCI etc.)" | |
1911 | ||
1912 | config PCI | |
1ac97018 | 1913 | bool "PCI support" |
1c858087 | 1914 | default y |
e279b6c1 | 1915 | select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC) |
8f9ca475 | 1916 | ---help--- |
e279b6c1 SR |
1917 | Find out whether you have a PCI motherboard. PCI is the name of a |
1918 | bus system, i.e. the way the CPU talks to the other stuff inside | |
1919 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | |
1920 | VESA. If you have PCI, say Y, otherwise N. | |
1921 | ||
e279b6c1 SR |
1922 | choice |
1923 | prompt "PCI access mode" | |
efefa6f6 | 1924 | depends on X86_32 && PCI |
e279b6c1 SR |
1925 | default PCI_GOANY |
1926 | ---help--- | |
1927 | On PCI systems, the BIOS can be used to detect the PCI devices and | |
1928 | determine their configuration. However, some old PCI motherboards | |
1929 | have BIOS bugs and may crash if this is done. Also, some embedded | |
1930 | PCI-based systems don't have any BIOS at all. Linux can also try to | |
1931 | detect the PCI hardware directly without using the BIOS. | |
1932 | ||
1933 | With this option, you can specify how Linux should detect the | |
1934 | PCI devices. If you choose "BIOS", the BIOS will be used, | |
1935 | if you choose "Direct", the BIOS won't be used, and if you | |
1936 | choose "MMConfig", then PCI Express MMCONFIG will be used. | |
1937 | If you choose "Any", the kernel will try MMCONFIG, then the | |
1938 | direct access method and falls back to the BIOS if that doesn't | |
1939 | work. If unsure, go with the default, which is "Any". | |
1940 | ||
1941 | config PCI_GOBIOS | |
1942 | bool "BIOS" | |
1943 | ||
1944 | config PCI_GOMMCONFIG | |
1945 | bool "MMConfig" | |
1946 | ||
1947 | config PCI_GODIRECT | |
1948 | bool "Direct" | |
1949 | ||
3ef0e1f8 | 1950 | config PCI_GOOLPC |
76fb6570 | 1951 | bool "OLPC XO-1" |
3ef0e1f8 AS |
1952 | depends on OLPC |
1953 | ||
2bdd1b03 AS |
1954 | config PCI_GOANY |
1955 | bool "Any" | |
1956 | ||
e279b6c1 SR |
1957 | endchoice |
1958 | ||
1959 | config PCI_BIOS | |
3c2362e6 | 1960 | def_bool y |
efefa6f6 | 1961 | depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY) |
e279b6c1 SR |
1962 | |
1963 | # x86-64 doesn't support PCI BIOS access from long mode so always go direct. | |
1964 | config PCI_DIRECT | |
3c2362e6 | 1965 | def_bool y |
0aba496f | 1966 | depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG)) |
e279b6c1 SR |
1967 | |
1968 | config PCI_MMCONFIG | |
3c2362e6 | 1969 | def_bool y |
5f0db7a2 | 1970 | depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY) |
e279b6c1 | 1971 | |
3ef0e1f8 | 1972 | config PCI_OLPC |
2bdd1b03 AS |
1973 | def_bool y |
1974 | depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY) | |
3ef0e1f8 | 1975 | |
b5401a96 AN |
1976 | config PCI_XEN |
1977 | def_bool y | |
1978 | depends on PCI && XEN | |
1979 | select SWIOTLB_XEN | |
1980 | ||
e279b6c1 | 1981 | config PCI_DOMAINS |
3c2362e6 | 1982 | def_bool y |
e279b6c1 | 1983 | depends on PCI |
e279b6c1 SR |
1984 | |
1985 | config PCI_MMCONFIG | |
1986 | bool "Support mmconfig PCI config space access" | |
1987 | depends on X86_64 && PCI && ACPI | |
1988 | ||
3f6ea84a | 1989 | config PCI_CNB20LE_QUIRK |
6a108a14 | 1990 | bool "Read CNB20LE Host Bridge Windows" if EXPERT |
64a5fed6 | 1991 | depends on PCI && EXPERIMENTAL |
3f6ea84a IS |
1992 | help |
1993 | Read the PCI windows out of the CNB20LE host bridge. This allows | |
1994 | PCI hotplug to work on systems with the CNB20LE chipset which do | |
1995 | not have ACPI. | |
1996 | ||
64a5fed6 BH |
1997 | There's no public spec for this chipset, and this functionality |
1998 | is known to be incomplete. | |
1999 | ||
2000 | You should say N unless you know you need this. | |
2001 | ||
e279b6c1 SR |
2002 | source "drivers/pci/pcie/Kconfig" |
2003 | ||
2004 | source "drivers/pci/Kconfig" | |
2005 | ||
1c00f016 | 2006 | # x86_64 have no ISA slots, but can have ISA-style DMA. |
e279b6c1 | 2007 | config ISA_DMA_API |
1c00f016 DR |
2008 | bool "ISA-style DMA support" if (X86_64 && EXPERT) |
2009 | default y | |
2010 | help | |
2011 | Enables ISA-style DMA support for devices requiring such controllers. | |
2012 | If unsure, say Y. | |
e279b6c1 SR |
2013 | |
2014 | if X86_32 | |
2015 | ||
2016 | config ISA | |
2017 | bool "ISA support" | |
8f9ca475 | 2018 | ---help--- |
e279b6c1 SR |
2019 | Find out whether you have ISA slots on your motherboard. ISA is the |
2020 | name of a bus system, i.e. the way the CPU talks to the other stuff | |
2021 | inside your box. Other bus systems are PCI, EISA, MicroChannel | |
2022 | (MCA) or VESA. ISA is an older system, now being displaced by PCI; | |
2023 | newer boards don't support it. If you have ISA, say Y, otherwise N. | |
2024 | ||
2025 | config EISA | |
2026 | bool "EISA support" | |
2027 | depends on ISA | |
2028 | ---help--- | |
2029 | The Extended Industry Standard Architecture (EISA) bus was | |
2030 | developed as an open alternative to the IBM MicroChannel bus. | |
2031 | ||
2032 | The EISA bus provided some of the features of the IBM MicroChannel | |
2033 | bus while maintaining backward compatibility with cards made for | |
2034 | the older ISA bus. The EISA bus saw limited use between 1988 and | |
2035 | 1995 when it was made obsolete by the PCI bus. | |
2036 | ||
2037 | Say Y here if you are building a kernel for an EISA-based machine. | |
2038 | ||
2039 | Otherwise, say N. | |
2040 | ||
2041 | source "drivers/eisa/Kconfig" | |
2042 | ||
e279b6c1 SR |
2043 | config SCx200 |
2044 | tristate "NatSemi SCx200 support" | |
8f9ca475 | 2045 | ---help--- |
e279b6c1 SR |
2046 | This provides basic support for National Semiconductor's |
2047 | (now AMD's) Geode processors. The driver probes for the | |
2048 | PCI-IDs of several on-chip devices, so its a good dependency | |
2049 | for other scx200_* drivers. | |
2050 | ||
2051 | If compiled as a module, the driver is named scx200. | |
2052 | ||
2053 | config SCx200HR_TIMER | |
2054 | tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" | |
592913ec | 2055 | depends on SCx200 |
e279b6c1 | 2056 | default y |
8f9ca475 | 2057 | ---help--- |
e279b6c1 SR |
2058 | This driver provides a clocksource built upon the on-chip |
2059 | 27MHz high-resolution timer. Its also a workaround for | |
2060 | NSC Geode SC-1100's buggy TSC, which loses time when the | |
2061 | processor goes idle (as is done by the scheduler). The | |
2062 | other workaround is idle=poll boot option. | |
2063 | ||
3ef0e1f8 AS |
2064 | config OLPC |
2065 | bool "One Laptop Per Child support" | |
54008979 | 2066 | depends on !X86_PAE |
3c554946 | 2067 | select GPIOLIB |
dc3119e7 | 2068 | select OF |
45bb1674 | 2069 | select OF_PROMTREE |
b4e51854 | 2070 | select IRQ_DOMAIN |
8f9ca475 | 2071 | ---help--- |
3ef0e1f8 AS |
2072 | Add support for detecting the unique features of the OLPC |
2073 | XO hardware. | |
2074 | ||
a3128588 DD |
2075 | config OLPC_XO1_PM |
2076 | bool "OLPC XO-1 Power Management" | |
97c4cb71 | 2077 | depends on OLPC && MFD_CS5535 && PM_SLEEP |
a3128588 | 2078 | select MFD_CORE |
bf1ebf00 | 2079 | ---help--- |
97c4cb71 | 2080 | Add support for poweroff and suspend of the OLPC XO-1 laptop. |
bf1ebf00 | 2081 | |
cfee9597 DD |
2082 | config OLPC_XO1_RTC |
2083 | bool "OLPC XO-1 Real Time Clock" | |
2084 | depends on OLPC_XO1_PM && RTC_DRV_CMOS | |
2085 | ---help--- | |
2086 | Add support for the XO-1 real time clock, which can be used as a | |
2087 | programmable wakeup source. | |
2088 | ||
7feda8e9 DD |
2089 | config OLPC_XO1_SCI |
2090 | bool "OLPC XO-1 SCI extras" | |
d8d01a63 DD |
2091 | depends on OLPC && OLPC_XO1_PM |
2092 | select POWER_SUPPLY | |
7feda8e9 DD |
2093 | select GPIO_CS5535 |
2094 | select MFD_CORE | |
2095 | ---help--- | |
2096 | Add support for SCI-based features of the OLPC XO-1 laptop: | |
7bc74b3d | 2097 | - EC-driven system wakeups |
7feda8e9 | 2098 | - Power button |
7bc74b3d | 2099 | - Ebook switch |
2cf2baea | 2100 | - Lid switch |
e1040ac6 DD |
2101 | - AC adapter status updates |
2102 | - Battery status updates | |
7feda8e9 | 2103 | |
a0f30f59 DD |
2104 | config OLPC_XO15_SCI |
2105 | bool "OLPC XO-1.5 SCI extras" | |
d8d01a63 DD |
2106 | depends on OLPC && ACPI |
2107 | select POWER_SUPPLY | |
a0f30f59 DD |
2108 | ---help--- |
2109 | Add support for SCI-based features of the OLPC XO-1.5 laptop: | |
2110 | - EC-driven system wakeups | |
2111 | - AC adapter status updates | |
2112 | - Battery status updates | |
bf1ebf00 | 2113 | |
d4f3e350 EW |
2114 | config ALIX |
2115 | bool "PCEngines ALIX System Support (LED setup)" | |
2116 | select GPIOLIB | |
2117 | ---help--- | |
2118 | This option enables system support for the PCEngines ALIX. | |
2119 | At present this just sets up LEDs for GPIO control on | |
2120 | ALIX2/3/6 boards. However, other system specific setup should | |
2121 | get added here. | |
2122 | ||
2123 | Note: You must still enable the drivers for GPIO and LED support | |
2124 | (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs | |
2125 | ||
2126 | Note: You have to set alix.force=1 for boards with Award BIOS. | |
2127 | ||
da4e3302 PP |
2128 | config NET5501 |
2129 | bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)" | |
2130 | select GPIOLIB | |
2131 | ---help--- | |
2132 | This option enables system support for the Soekris Engineering net5501. | |
2133 | ||
3197059a PP |
2134 | config GEOS |
2135 | bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)" | |
2136 | select GPIOLIB | |
2137 | depends on DMI | |
2138 | ---help--- | |
2139 | This option enables system support for the Traverse Technologies GEOS. | |
2140 | ||
bc0120fd SR |
2141 | endif # X86_32 |
2142 | ||
23ac4ae8 | 2143 | config AMD_NB |
e279b6c1 | 2144 | def_bool y |
0e152cd7 | 2145 | depends on CPU_SUP_AMD && PCI |
e279b6c1 SR |
2146 | |
2147 | source "drivers/pcmcia/Kconfig" | |
2148 | ||
2149 | source "drivers/pci/hotplug/Kconfig" | |
2150 | ||
388b78ad AB |
2151 | config RAPIDIO |
2152 | bool "RapidIO support" | |
2153 | depends on PCI | |
2154 | default n | |
2155 | help | |
2156 | If you say Y here, the kernel will include drivers and | |
2157 | infrastructure code to support RapidIO interconnect devices. | |
2158 | ||
2159 | source "drivers/rapidio/Kconfig" | |
2160 | ||
e279b6c1 SR |
2161 | endmenu |
2162 | ||
2163 | ||
2164 | menu "Executable file formats / Emulations" | |
2165 | ||
2166 | source "fs/Kconfig.binfmt" | |
2167 | ||
2168 | config IA32_EMULATION | |
2169 | bool "IA32 Emulation" | |
2170 | depends on X86_64 | |
a97f52e6 | 2171 | select COMPAT_BINFMT_ELF |
af1839eb | 2172 | select HAVE_UID16 |
8f9ca475 | 2173 | ---help--- |
5fd92e65 L |
2174 | Include code to run legacy 32-bit programs under a |
2175 | 64-bit kernel. You should likely turn this on, unless you're | |
2176 | 100% sure that you don't have any 32-bit programs left. | |
e279b6c1 SR |
2177 | |
2178 | config IA32_AOUT | |
8f9ca475 IM |
2179 | tristate "IA32 a.out support" |
2180 | depends on IA32_EMULATION | |
2181 | ---help--- | |
2182 | Support old a.out binaries in the 32bit emulation. | |
e279b6c1 | 2183 | |
0bf62763 | 2184 | config X86_X32 |
5fd92e65 L |
2185 | bool "x32 ABI for 64-bit mode (EXPERIMENTAL)" |
2186 | depends on X86_64 && IA32_EMULATION && EXPERIMENTAL | |
2187 | ---help--- | |
2188 | Include code to run binaries for the x32 native 32-bit ABI | |
2189 | for 64-bit processors. An x32 process gets access to the | |
2190 | full 64-bit register file and wide data path while leaving | |
2191 | pointers at 32 bits for smaller memory footprint. | |
2192 | ||
2193 | You will need a recent binutils (2.22 or later) with | |
2194 | elf32_x86_64 support enabled to compile a kernel with this | |
2195 | option set. | |
2196 | ||
e279b6c1 | 2197 | config COMPAT |
3c2362e6 | 2198 | def_bool y |
0bf62763 | 2199 | depends on IA32_EMULATION || X86_X32 |
48b25c43 | 2200 | select ARCH_WANT_OLD_COMPAT_IPC |
e279b6c1 | 2201 | |
3120e25e | 2202 | if COMPAT |
e279b6c1 | 2203 | config COMPAT_FOR_U64_ALIGNMENT |
3120e25e | 2204 | def_bool y |
e279b6c1 SR |
2205 | |
2206 | config SYSVIPC_COMPAT | |
3c2362e6 | 2207 | def_bool y |
3120e25e | 2208 | depends on SYSVIPC |
e279b6c1 | 2209 | |
ee009e4a | 2210 | config KEYS_COMPAT |
3120e25e JB |
2211 | def_bool y |
2212 | depends on KEYS | |
2213 | endif | |
ee009e4a | 2214 | |
e279b6c1 SR |
2215 | endmenu |
2216 | ||
2217 | ||
e5beae16 KP |
2218 | config HAVE_ATOMIC_IOMAP |
2219 | def_bool y | |
2220 | depends on X86_32 | |
2221 | ||
3cba11d3 MH |
2222 | config HAVE_TEXT_POKE_SMP |
2223 | bool | |
2224 | select STOP_MACHINE if SMP | |
2225 | ||
4692d77f AR |
2226 | config X86_DEV_DMA_OPS |
2227 | bool | |
83125a3a | 2228 | depends on X86_64 || STA2X11 |
4692d77f | 2229 | |
f7219a53 AR |
2230 | config X86_DMA_REMAP |
2231 | bool | |
83125a3a | 2232 | depends on STA2X11 |
f7219a53 | 2233 | |
e279b6c1 SR |
2234 | source "net/Kconfig" |
2235 | ||
2236 | source "drivers/Kconfig" | |
2237 | ||
2238 | source "drivers/firmware/Kconfig" | |
2239 | ||
2240 | source "fs/Kconfig" | |
2241 | ||
e279b6c1 SR |
2242 | source "arch/x86/Kconfig.debug" |
2243 | ||
2244 | source "security/Kconfig" | |
2245 | ||
2246 | source "crypto/Kconfig" | |
2247 | ||
edf88417 AK |
2248 | source "arch/x86/kvm/Kconfig" |
2249 | ||
e279b6c1 | 2250 | source "lib/Kconfig" |