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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 | |
10 | def_bool !64BIT | |
82491451 | 11 | select CLKSRC_I8253 |
daa93fab SR |
12 | |
13 | config X86_64 | |
14 | def_bool 64BIT | |
4692d77f | 15 | select X86_DEV_DMA_OPS |
1032c0ba SR |
16 | |
17 | ### Arch settings | |
8d5fffb9 | 18 | config X86 |
3c2362e6 | 19 | def_bool y |
e17c6d56 | 20 | select HAVE_AOUT if X86_32 |
a5574cf6 | 21 | select HAVE_UNSTABLE_SCHED_CLOCK |
ec7748b5 | 22 | select HAVE_IDE |
42d4b839 | 23 | select HAVE_OPROFILE |
8761f1ab | 24 | select HAVE_PCSPKR_PLATFORM |
cc2067a5 | 25 | select HAVE_PERF_EVENTS |
e360adbe | 26 | select HAVE_IRQ_WORK |
28b2ee20 | 27 | select HAVE_IOREMAP_PROT |
3f550096 | 28 | select HAVE_KPROBES |
72d7c3b3 | 29 | select HAVE_MEMBLOCK |
0608f70c | 30 | select HAVE_MEMBLOCK_NODE_MAP |
c378ddd5 | 31 | select ARCH_DISCARD_MEMBLOCK |
1f972768 | 32 | select ARCH_WANT_OPTIONAL_GPIOLIB |
da4276b8 | 33 | select ARCH_WANT_FRAME_POINTERS |
7c095e46 | 34 | select HAVE_DMA_ATTRS |
0a2b9a6e | 35 | select HAVE_DMA_CONTIGUOUS if !SWIOTLB |
9edddaa2 | 36 | select HAVE_KRETPROBES |
c0f7ac3a | 37 | select HAVE_OPTPROBES |
e4b2b886 | 38 | select HAVE_FTRACE_MCOUNT_RECORD |
cf4db259 | 39 | select HAVE_C_RECORDMCOUNT |
677aa9f7 | 40 | select HAVE_DYNAMIC_FTRACE |
606576ce | 41 | select HAVE_FUNCTION_TRACER |
48d68b20 | 42 | select HAVE_FUNCTION_GRAPH_TRACER |
71e308a2 | 43 | select HAVE_FUNCTION_GRAPH_FP_TEST |
60a7ecf4 | 44 | select HAVE_FUNCTION_TRACE_MCOUNT_TEST |
66700001 | 45 | select HAVE_SYSCALL_TRACEPOINTS |
e0ec9483 | 46 | select HAVE_KVM |
49793b03 | 47 | select HAVE_ARCH_KGDB |
99bbc4b1 | 48 | select HAVE_ARCH_TRACEHOOK |
323ec001 | 49 | select HAVE_GENERIC_DMA_COHERENT if X86_32 |
58340a07 | 50 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
8d26487f | 51 | select USER_STACKTRACE_SUPPORT |
f850c30c | 52 | select HAVE_REGS_AND_STACK_ACCESS_API |
2118d0c5 | 53 | select HAVE_DMA_API_DEBUG |
2e9f3bdd PA |
54 | select HAVE_KERNEL_GZIP |
55 | select HAVE_KERNEL_BZIP2 | |
56 | select HAVE_KERNEL_LZMA | |
30314804 | 57 | select HAVE_KERNEL_XZ |
13510997 | 58 | select HAVE_KERNEL_LZO |
0067f129 | 59 | select HAVE_HW_BREAKPOINT |
0102752e | 60 | select HAVE_MIXED_BREAKPOINTS_REGS |
99e8c5a3 | 61 | select PERF_EVENTS |
c01d4323 | 62 | select HAVE_PERF_EVENTS_NMI |
c5e63197 | 63 | select HAVE_PERF_REGS |
99e8c5a3 | 64 | select ANON_INODES |
43570fd2 | 65 | select HAVE_ALIGNED_STRUCT_PAGE if SLUB && !M386 |
4156153c | 66 | select HAVE_CMPXCHG_LOCAL if !M386 |
2565409f | 67 | select HAVE_CMPXCHG_DOUBLE |
0a4af3b0 | 68 | select HAVE_ARCH_KMEMCHECK |
7c68af6e | 69 | select HAVE_USER_RETURN_NOTIFIER |
e39f5602 | 70 | select ARCH_BINFMT_ELF_RANDOMIZE_PIE |
46eb3b64 | 71 | select HAVE_ARCH_JUMP_LABEL |
3cba11d3 | 72 | select HAVE_TEXT_POKE_SMP |
3bb9808e | 73 | select HAVE_GENERIC_HARDIRQS |
7463449b | 74 | select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE |
141d55e6 | 75 | select SPARSE_IRQ |
c49aa5bd | 76 | select GENERIC_FIND_FIRST_BIT |
3bb9808e TG |
77 | select GENERIC_IRQ_PROBE |
78 | select GENERIC_PENDING_IRQ if SMP | |
517e4981 | 79 | select GENERIC_IRQ_SHOW |
d1748302 | 80 | select GENERIC_CLOCKEVENTS_MIN_ADJUST |
c0185808 | 81 | select IRQ_FORCED_THREADING |
351f8f8e | 82 | select USE_GENERIC_SMP_HELPERS if SMP |
e47b65b0 | 83 | select HAVE_BPF_JIT if X86_64 |
0a779c57 | 84 | select CLKEVT_I8253 |
df013ffb | 85 | select ARCH_HAVE_NMI_SAFE_CMPXCHG |
4673ca8e | 86 | select GENERIC_IOMAP |
e419b4cc | 87 | select DCACHE_WORD_ACCESS |
7eb43a6d | 88 | select GENERIC_SMP_IDLE_THREAD |
c1d7e01d | 89 | select ARCH_WANT_IPC_PARSE_VERSION if X86_32 |
c6cfbeb4 | 90 | select HAVE_ARCH_SECCOMP_FILTER |
8b5ad472 | 91 | select BUILDTIME_EXTABLE_SORT |
bdebaf80 TG |
92 | select GENERIC_CMOS_UPDATE |
93 | select CLOCKSOURCE_WATCHDOG | |
94 | select GENERIC_CLOCKEVENTS | |
95 | select ARCH_CLOCKSOURCE_DATA if X86_64 | |
96 | select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) | |
97 | select GENERIC_TIME_VSYSCALL if X86_64 | |
98 | select KTIME_SCALAR if X86_32 | |
4ae73f2d | 99 | select GENERIC_STRNCPY_FROM_USER |
5723aa99 | 100 | select GENERIC_STRNLEN_USER |
7d8330a5 | 101 | |
ba7e4d13 | 102 | config INSTRUCTION_DECODER |
2b144498 | 103 | def_bool (KPROBES || PERF_EVENTS || UPROBES) |
ba7e4d13 | 104 | |
51b26ada LT |
105 | config OUTPUT_FORMAT |
106 | string | |
107 | default "elf32-i386" if X86_32 | |
108 | default "elf64-x86-64" if X86_64 | |
109 | ||
73531905 | 110 | config ARCH_DEFCONFIG |
b9b39bfb | 111 | string |
73531905 SR |
112 | default "arch/x86/configs/i386_defconfig" if X86_32 |
113 | default "arch/x86/configs/x86_64_defconfig" if X86_64 | |
b9b39bfb | 114 | |
8d5fffb9 | 115 | config LOCKDEP_SUPPORT |
3c2362e6 | 116 | def_bool y |
8d5fffb9 SR |
117 | |
118 | config STACKTRACE_SUPPORT | |
3c2362e6 | 119 | def_bool y |
8d5fffb9 | 120 | |
aa7d9350 HC |
121 | config HAVE_LATENCYTOP_SUPPORT |
122 | def_bool y | |
123 | ||
8d5fffb9 | 124 | config MMU |
3c2362e6 | 125 | def_bool y |
8d5fffb9 | 126 | |
8d5fffb9 SR |
127 | config SBUS |
128 | bool | |
129 | ||
3bc4e459 | 130 | config NEED_DMA_MAP_STATE |
d3f13810 | 131 | def_bool (X86_64 || INTEL_IOMMU || DMA_API_DEBUG) |
3bc4e459 | 132 | |
18e98307 | 133 | config NEED_SG_DMA_LENGTH |
4a14d84e | 134 | def_bool y |
18e98307 | 135 | |
8d5fffb9 | 136 | config GENERIC_ISA_DMA |
1c00f016 | 137 | def_bool ISA_DMA_API |
8d5fffb9 | 138 | |
8d5fffb9 | 139 | config GENERIC_BUG |
3c2362e6 | 140 | def_bool y |
8d5fffb9 | 141 | depends on BUG |
b93a531e JB |
142 | select GENERIC_BUG_RELATIVE_POINTERS if X86_64 |
143 | ||
144 | config GENERIC_BUG_RELATIVE_POINTERS | |
145 | bool | |
8d5fffb9 SR |
146 | |
147 | config GENERIC_HWEIGHT | |
3c2362e6 | 148 | def_bool y |
8d5fffb9 | 149 | |
a6082959 | 150 | config GENERIC_GPIO |
9ba16087 | 151 | bool |
a6082959 | 152 | |
8d5fffb9 | 153 | config ARCH_MAY_HAVE_PC_FDC |
8df3bd9e | 154 | def_bool ISA_DMA_API |
8d5fffb9 | 155 | |
1032c0ba SR |
156 | config RWSEM_GENERIC_SPINLOCK |
157 | def_bool !X86_XADD | |
158 | ||
159 | config RWSEM_XCHGADD_ALGORITHM | |
160 | def_bool X86_XADD | |
161 | ||
1032c0ba SR |
162 | config GENERIC_CALIBRATE_DELAY |
163 | def_bool y | |
164 | ||
9a0b8415 | 165 | config ARCH_HAS_CPU_RELAX |
166 | def_bool y | |
167 | ||
89cedfef VP |
168 | config ARCH_HAS_DEFAULT_IDLE |
169 | def_bool y | |
170 | ||
1b27d05b PE |
171 | config ARCH_HAS_CACHE_LINE_SIZE |
172 | def_bool y | |
173 | ||
fad12ac8 TR |
174 | config ARCH_HAS_CPU_AUTOPROBE |
175 | def_bool y | |
176 | ||
dd5af90a | 177 | config HAVE_SETUP_PER_CPU_AREA |
89c9c4c5 | 178 | def_bool y |
b32ef636 | 179 | |
08fc4580 TH |
180 | config NEED_PER_CPU_EMBED_FIRST_CHUNK |
181 | def_bool y | |
182 | ||
183 | config NEED_PER_CPU_PAGE_FIRST_CHUNK | |
11124411 TH |
184 | def_bool y |
185 | ||
801e4062 JB |
186 | config ARCH_HIBERNATION_POSSIBLE |
187 | def_bool y | |
801e4062 | 188 | |
f4cb5700 JB |
189 | config ARCH_SUSPEND_POSSIBLE |
190 | def_bool y | |
f4cb5700 | 191 | |
8d5fffb9 SR |
192 | config ZONE_DMA32 |
193 | bool | |
194 | default X86_64 | |
195 | ||
8d5fffb9 SR |
196 | config AUDIT_ARCH |
197 | bool | |
198 | default X86_64 | |
199 | ||
765c68bd IM |
200 | config ARCH_SUPPORTS_OPTIMIZED_INLINING |
201 | def_bool y | |
202 | ||
6a11f75b AM |
203 | config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
204 | def_bool y | |
205 | ||
69575d38 SW |
206 | config HAVE_INTEL_TXT |
207 | def_bool y | |
d3f13810 | 208 | depends on EXPERIMENTAL && INTEL_IOMMU && ACPI |
69575d38 | 209 | |
6b0c3d44 SR |
210 | config X86_32_SMP |
211 | def_bool y | |
212 | depends on X86_32 && SMP | |
213 | ||
214 | config X86_64_SMP | |
215 | def_bool y | |
216 | depends on X86_64 && SMP | |
217 | ||
8d5fffb9 | 218 | config X86_HT |
6fc108a0 | 219 | def_bool y |
ee0011a7 | 220 | depends on SMP |
8d5fffb9 | 221 | |
ccbeed3a TH |
222 | config X86_32_LAZY_GS |
223 | def_bool y | |
60a5317f | 224 | depends on X86_32 && !CC_STACKPROTECTOR |
ccbeed3a | 225 | |
d61931d8 BP |
226 | config ARCH_HWEIGHT_CFLAGS |
227 | string | |
228 | default "-fcall-saved-ecx -fcall-saved-edx" if X86_32 | |
229 | 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 | |
230 | ||
d7c53c9e BP |
231 | config ARCH_CPU_PROBE_RELEASE |
232 | def_bool y | |
233 | depends on HOTPLUG_CPU | |
234 | ||
2b144498 SD |
235 | config ARCH_SUPPORTS_UPROBES |
236 | def_bool y | |
237 | ||
506f1d07 | 238 | source "init/Kconfig" |
dc52ddc0 | 239 | source "kernel/Kconfig.freezer" |
8d5fffb9 | 240 | |
506f1d07 SR |
241 | menu "Processor type and features" |
242 | ||
5ee71535 RD |
243 | config ZONE_DMA |
244 | bool "DMA memory allocation support" if EXPERT | |
245 | default y | |
246 | help | |
247 | DMA memory allocation support allows devices with less than 32-bit | |
248 | addressing to allocate within the first 16MB of address space. | |
249 | Disable if no such devices will be used. | |
250 | ||
251 | If unsure, say Y. | |
252 | ||
506f1d07 SR |
253 | config SMP |
254 | bool "Symmetric multi-processing support" | |
255 | ---help--- | |
256 | This enables support for systems with more than one CPU. If you have | |
257 | a system with only one CPU, like most personal computers, say N. If | |
258 | you have a system with more than one CPU, say Y. | |
259 | ||
260 | If you say N here, the kernel will run on single and multiprocessor | |
261 | machines, but will use only one CPU of a multiprocessor machine. If | |
262 | you say Y here, the kernel will run on many, but not all, | |
263 | singleprocessor machines. On a singleprocessor machine, the kernel | |
264 | will run faster if you say N here. | |
265 | ||
266 | Note that if you say Y here and choose architecture "586" or | |
267 | "Pentium" under "Processor family", the kernel will not work on 486 | |
268 | architectures. Similarly, multiprocessor kernels for the "PPro" | |
269 | architecture may not work on all Pentium based boards. | |
270 | ||
271 | People using multiprocessor machines who say Y here should also say | |
272 | Y to "Enhanced Real Time Clock Support", below. The "Advanced Power | |
273 | Management" code will be disabled if you say Y here. | |
274 | ||
395cf969 | 275 | See also <file:Documentation/x86/i386/IO-APIC.txt>, |
506f1d07 SR |
276 | <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at |
277 | <http://www.tldp.org/docs.html#howto>. | |
278 | ||
279 | If you don't know what to do here, say N. | |
280 | ||
06cd9a7d YL |
281 | config X86_X2APIC |
282 | bool "Support x2apic" | |
d3f13810 | 283 | depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP |
06cd9a7d YL |
284 | ---help--- |
285 | This enables x2apic support on CPUs that have this feature. | |
286 | ||
287 | This allows 32-bit apic IDs (so it can support very large systems), | |
288 | and accesses the local apic via MSRs not via mmio. | |
289 | ||
06cd9a7d YL |
290 | If you don't know what to do here, say N. |
291 | ||
6695c85b | 292 | config X86_MPPARSE |
7a527688 JB |
293 | bool "Enable MPS table" if ACPI |
294 | default y | |
5ab74722 | 295 | depends on X86_LOCAL_APIC |
8f9ca475 | 296 | ---help--- |
6695c85b YL |
297 | For old smp systems that do not have proper acpi support. Newer systems |
298 | (esp with 64bit cpus) with acpi support, MADT and DSDT will override it | |
6695c85b | 299 | |
26f7ef14 YL |
300 | config X86_BIGSMP |
301 | bool "Support for big SMP systems with more than 8 CPUs" | |
302 | depends on X86_32 && SMP | |
8f9ca475 | 303 | ---help--- |
26f7ef14 | 304 | This option is needed for the systems that have more than 8 CPUs |
506f1d07 | 305 | |
8425091f | 306 | if X86_32 |
c5c606d9 RT |
307 | config X86_EXTENDED_PLATFORM |
308 | bool "Support for extended (non-PC) x86 platforms" | |
309 | default y | |
8f9ca475 | 310 | ---help--- |
06ac8346 IM |
311 | If you disable this option then the kernel will only support |
312 | standard PC platforms. (which covers the vast majority of | |
313 | systems out there.) | |
314 | ||
8425091f RT |
315 | If you enable this option then you'll be able to select support |
316 | for the following (non-PC) 32 bit x86 platforms: | |
317 | AMD Elan | |
318 | NUMAQ (IBM/Sequent) | |
319 | RDC R-321x SoC | |
320 | SGI 320/540 (Visual Workstation) | |
83125a3a | 321 | STA2X11-based (e.g. Northville) |
8425091f RT |
322 | Summit/EXA (IBM x440) |
323 | Unisys ES7000 IA32 series | |
3f4110a4 | 324 | Moorestown MID devices |
06ac8346 IM |
325 | |
326 | If you have one of these systems, or if you want to build a | |
327 | generic distribution kernel, say Y here - otherwise say N. | |
8425091f | 328 | endif |
06ac8346 | 329 | |
8425091f RT |
330 | if X86_64 |
331 | config X86_EXTENDED_PLATFORM | |
332 | bool "Support for extended (non-PC) x86 platforms" | |
333 | default y | |
334 | ---help--- | |
335 | If you disable this option then the kernel will only support | |
336 | standard PC platforms. (which covers the vast majority of | |
337 | systems out there.) | |
338 | ||
339 | If you enable this option then you'll be able to select support | |
340 | for the following (non-PC) 64 bit x86 platforms: | |
44b111b5 | 341 | Numascale NumaChip |
8425091f RT |
342 | ScaleMP vSMP |
343 | SGI Ultraviolet | |
344 | ||
345 | If you have one of these systems, or if you want to build a | |
346 | generic distribution kernel, say Y here - otherwise say N. | |
347 | endif | |
c5c606d9 RT |
348 | # This is an alphabetically sorted list of 64 bit extended platforms |
349 | # Please maintain the alphabetic order if and when there are additions | |
44b111b5 SP |
350 | config X86_NUMACHIP |
351 | bool "Numascale NumaChip" | |
352 | depends on X86_64 | |
353 | depends on X86_EXTENDED_PLATFORM | |
354 | depends on NUMA | |
355 | depends on SMP | |
356 | depends on X86_X2APIC | |
44b111b5 SP |
357 | ---help--- |
358 | Adds support for Numascale NumaChip large-SMP systems. Needed to | |
359 | enable more than ~168 cores. | |
360 | If you don't have one of these, you should say N here. | |
506f1d07 | 361 | |
c5c606d9 RT |
362 | config X86_VSMP |
363 | bool "ScaleMP vSMP" | |
03f1a17c | 364 | select PARAVIRT_GUEST |
c5c606d9 RT |
365 | select PARAVIRT |
366 | depends on X86_64 && PCI | |
367 | depends on X86_EXTENDED_PLATFORM | |
ead91d4b | 368 | depends on SMP |
8f9ca475 | 369 | ---help--- |
c5c606d9 RT |
370 | Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is |
371 | supposed to run on these EM64T-based machines. Only choose this option | |
372 | if you have one of these machines. | |
5e3a77e9 | 373 | |
03b48632 NP |
374 | config X86_UV |
375 | bool "SGI Ultraviolet" | |
376 | depends on X86_64 | |
c5c606d9 | 377 | depends on X86_EXTENDED_PLATFORM |
54c28d29 | 378 | depends on NUMA |
9d6c26e7 | 379 | depends on X86_X2APIC |
8f9ca475 | 380 | ---help--- |
03b48632 NP |
381 | This option is needed in order to support SGI Ultraviolet systems. |
382 | If you don't have one of these, you should say N here. | |
383 | ||
c5c606d9 RT |
384 | # Following is an alphabetically sorted list of 32 bit extended platforms |
385 | # Please maintain the alphabetic order if and when there are additions | |
506f1d07 | 386 | |
c751e17b TG |
387 | config X86_INTEL_CE |
388 | bool "CE4100 TV platform" | |
389 | depends on PCI | |
390 | depends on PCI_GODIRECT | |
391 | depends on X86_32 | |
392 | depends on X86_EXTENDED_PLATFORM | |
37bc9f50 | 393 | select X86_REBOOTFIXUPS |
da6b737b SAS |
394 | select OF |
395 | select OF_EARLY_FLATTREE | |
b4e51854 | 396 | select IRQ_DOMAIN |
c751e17b TG |
397 | ---help--- |
398 | Select for the Intel CE media processor (CE4100) SOC. | |
399 | This option compiles in support for the CE4100 SOC for settop | |
400 | boxes and media devices. | |
401 | ||
dd137525 | 402 | config X86_WANT_INTEL_MID |
43605ef1 AC |
403 | bool "Intel MID platform support" |
404 | depends on X86_32 | |
405 | depends on X86_EXTENDED_PLATFORM | |
406 | ---help--- | |
407 | Select to build a kernel capable of supporting Intel MID platform | |
408 | systems which do not have the PCI legacy interfaces (Moorestown, | |
409 | Medfield). If you are building for a PC class system say N here. | |
410 | ||
dd137525 | 411 | if X86_WANT_INTEL_MID |
43605ef1 | 412 | |
4e2b1c4f AC |
413 | config X86_INTEL_MID |
414 | bool | |
415 | ||
1ea7c673 AC |
416 | config X86_MDFLD |
417 | bool "Medfield MID platform" | |
418 | depends on PCI | |
419 | depends on PCI_GOANY | |
420 | depends on X86_IO_APIC | |
7c9c3a1e AC |
421 | select X86_INTEL_MID |
422 | select SFI | |
423 | select DW_APB_TIMER | |
1ea7c673 AC |
424 | select APB_TIMER |
425 | select I2C | |
426 | select SPI | |
427 | select INTEL_SCU_IPC | |
428 | select X86_PLATFORM_DEVICES | |
15a713df | 429 | select MFD_INTEL_MSIC |
1ea7c673 AC |
430 | ---help--- |
431 | Medfield is Intel's Low Power Intel Architecture (LPIA) based Moblin | |
432 | Internet Device(MID) platform. | |
433 | Unlike standard x86 PCs, Medfield does not have many legacy devices | |
434 | nor standard legacy replacement devices/features. e.g. Medfield does | |
435 | not contain i8259, i8254, HPET, legacy BIOS, most of the io ports. | |
436 | ||
43605ef1 AC |
437 | endif |
438 | ||
c5c606d9 RT |
439 | config X86_RDC321X |
440 | bool "RDC R-321x SoC" | |
506f1d07 | 441 | depends on X86_32 |
c5c606d9 RT |
442 | depends on X86_EXTENDED_PLATFORM |
443 | select M486 | |
444 | select X86_REBOOTFIXUPS | |
445 | ---help--- | |
446 | This option is needed for RDC R-321x system-on-chip, also known | |
447 | as R-8610-(G). | |
448 | If you don't have one of these chips, you should say N here. | |
449 | ||
e0c7ae37 | 450 | config X86_32_NON_STANDARD |
9c398017 IM |
451 | bool "Support non-standard 32-bit SMP architectures" |
452 | depends on X86_32 && SMP | |
c5c606d9 | 453 | depends on X86_EXTENDED_PLATFORM |
8f9ca475 | 454 | ---help--- |
83125a3a AR |
455 | This option compiles in the NUMAQ, Summit, bigsmp, ES7000, |
456 | STA2X11, default subarchitectures. It is intended for a generic | |
457 | binary kernel. If you select them all, kernel will probe it | |
458 | one by one and will fallback to default. | |
d49c4288 | 459 | |
c5c606d9 | 460 | # Alphabetically sorted list of Non standard 32 bit platforms |
d49c4288 | 461 | |
506f1d07 SR |
462 | config X86_NUMAQ |
463 | bool "NUMAQ (IBM/Sequent)" | |
e0c7ae37 | 464 | depends on X86_32_NON_STANDARD |
a92d152e | 465 | depends on PCI |
506f1d07 | 466 | select NUMA |
9c398017 | 467 | select X86_MPPARSE |
8f9ca475 | 468 | ---help--- |
d49c4288 YL |
469 | This option is used for getting Linux to run on a NUMAQ (IBM/Sequent) |
470 | NUMA multiquad box. This changes the way that processors are | |
471 | bootstrapped, and uses Clustered Logical APIC addressing mode instead | |
472 | of Flat Logical. You will need a new lynxer.elf file to flash your | |
473 | firmware with - send email to <Martin.Bligh@us.ibm.com>. | |
506f1d07 | 474 | |
d949f36f | 475 | config X86_SUPPORTS_MEMORY_FAILURE |
6fc108a0 | 476 | def_bool y |
d949f36f LT |
477 | # MCE code calls memory_failure(): |
478 | depends on X86_MCE | |
479 | # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags: | |
480 | depends on !X86_NUMAQ | |
481 | # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH: | |
482 | depends on X86_64 || !SPARSEMEM | |
483 | select ARCH_SUPPORTS_MEMORY_FAILURE | |
d949f36f | 484 | |
1b84e1c8 IM |
485 | config X86_VISWS |
486 | bool "SGI 320/540 (Visual Workstation)" | |
c5c606d9 RT |
487 | depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT |
488 | depends on X86_32_NON_STANDARD | |
489 | ---help--- | |
1b84e1c8 IM |
490 | The SGI Visual Workstation series is an IA32-based workstation |
491 | based on SGI systems chips with some legacy PC hardware attached. | |
492 | ||
493 | Say Y here to create a kernel to run on the SGI 320 or 540. | |
494 | ||
495 | A kernel compiled for the Visual Workstation will run on general | |
496 | PCs as well. See <file:Documentation/sgi-visws.txt> for details. | |
497 | ||
83125a3a AR |
498 | config STA2X11 |
499 | bool "STA2X11 Companion Chip Support" | |
500 | depends on X86_32_NON_STANDARD && PCI | |
501 | select X86_DEV_DMA_OPS | |
502 | select X86_DMA_REMAP | |
503 | select SWIOTLB | |
504 | select MFD_STA2X11 | |
505 | select ARCH_REQUIRE_GPIOLIB | |
506 | default n | |
507 | ---help--- | |
508 | This adds support for boards based on the STA2X11 IO-Hub, | |
509 | a.k.a. "ConneXt". The chip is used in place of the standard | |
510 | PC chipset, so all "standard" peripherals are missing. If this | |
511 | option is selected the kernel will still be able to boot on | |
512 | standard PC machines. | |
513 | ||
9c398017 IM |
514 | config X86_SUMMIT |
515 | bool "Summit/EXA (IBM x440)" | |
e0c7ae37 | 516 | depends on X86_32_NON_STANDARD |
8f9ca475 | 517 | ---help--- |
9c398017 IM |
518 | This option is needed for IBM systems that use the Summit/EXA chipset. |
519 | In particular, it is needed for the x440. | |
1f972768 | 520 | |
9c398017 | 521 | config X86_ES7000 |
c5c606d9 | 522 | bool "Unisys ES7000 IA32 series" |
26f7ef14 | 523 | depends on X86_32_NON_STANDARD && X86_BIGSMP |
8f9ca475 | 524 | ---help--- |
9c398017 IM |
525 | Support for Unisys ES7000 systems. Say 'Y' here if this kernel is |
526 | supposed to run on an IA32-based Unisys ES7000 system. | |
527 | ||
82148d1d S |
528 | config X86_32_IRIS |
529 | tristate "Eurobraille/Iris poweroff module" | |
530 | depends on X86_32 | |
531 | ---help--- | |
532 | The Iris machines from EuroBraille do not have APM or ACPI support | |
533 | to shut themselves down properly. A special I/O sequence is | |
534 | needed to do so, which is what this module does at | |
535 | kernel shutdown. | |
536 | ||
537 | This is only for Iris machines from EuroBraille. | |
538 | ||
539 | If unused, say N. | |
540 | ||
ae1e9130 | 541 | config SCHED_OMIT_FRAME_POINTER |
3c2362e6 HH |
542 | def_bool y |
543 | prompt "Single-depth WCHAN output" | |
a87d0914 | 544 | depends on X86 |
8f9ca475 | 545 | ---help--- |
506f1d07 SR |
546 | Calculate simpler /proc/<PID>/wchan values. If this option |
547 | is disabled then wchan values will recurse back to the | |
548 | caller function. This provides more accurate wchan values, | |
549 | at the expense of slightly more scheduling overhead. | |
550 | ||
551 | If in doubt, say "Y". | |
552 | ||
506f1d07 SR |
553 | menuconfig PARAVIRT_GUEST |
554 | bool "Paravirtualized guest support" | |
8f9ca475 | 555 | ---help--- |
506f1d07 SR |
556 | Say Y here to get to see options related to running Linux under |
557 | various hypervisors. This option alone does not add any kernel code. | |
558 | ||
559 | If you say N, all options in this submenu will be skipped and disabled. | |
560 | ||
561 | if PARAVIRT_GUEST | |
562 | ||
095c0aa8 GC |
563 | config PARAVIRT_TIME_ACCOUNTING |
564 | bool "Paravirtual steal time accounting" | |
565 | select PARAVIRT | |
566 | default n | |
567 | ---help--- | |
568 | Select this option to enable fine granularity task steal time | |
569 | accounting. Time spent executing other tasks in parallel with | |
570 | the current vCPU is discounted from the vCPU power. To account for | |
571 | that, there can be a small performance impact. | |
572 | ||
573 | If in doubt, say N here. | |
574 | ||
506f1d07 SR |
575 | source "arch/x86/xen/Kconfig" |
576 | ||
790c73f6 GOC |
577 | config KVM_CLOCK |
578 | bool "KVM paravirtualized clock" | |
579 | select PARAVIRT | |
f6e16d5a | 580 | select PARAVIRT_CLOCK |
8f9ca475 | 581 | ---help--- |
790c73f6 GOC |
582 | Turning on this option will allow you to run a paravirtualized clock |
583 | when running over the KVM hypervisor. Instead of relying on a PIT | |
584 | (or probably other) emulation by the underlying device model, the host | |
585 | provides the guest with timing infrastructure such as time of day, and | |
586 | system time | |
587 | ||
0cf1bfd2 MT |
588 | config KVM_GUEST |
589 | bool "KVM Guest support" | |
590 | select PARAVIRT | |
8f9ca475 IM |
591 | ---help--- |
592 | This option enables various optimizations for running under the KVM | |
593 | hypervisor. | |
0cf1bfd2 | 594 | |
506f1d07 SR |
595 | source "arch/x86/lguest/Kconfig" |
596 | ||
e61bd94a EPH |
597 | config PARAVIRT |
598 | bool "Enable paravirtualization code" | |
8f9ca475 | 599 | ---help--- |
e61bd94a EPH |
600 | This changes the kernel so it can modify itself when it is run |
601 | under a hypervisor, potentially improving performance significantly | |
602 | over full virtualization. However, when run without a hypervisor | |
603 | the kernel is theoretically slower and slightly larger. | |
604 | ||
b4ecc126 JF |
605 | config PARAVIRT_SPINLOCKS |
606 | bool "Paravirtualization layer for spinlocks" | |
607 | depends on PARAVIRT && SMP && EXPERIMENTAL | |
608 | ---help--- | |
609 | Paravirtualized spinlocks allow a pvops backend to replace the | |
610 | spinlock implementation with something virtualization-friendly | |
611 | (for example, block the virtual CPU rather than spinning). | |
612 | ||
613 | Unfortunately the downside is an up to 5% performance hit on | |
614 | native kernels, with various workloads. | |
615 | ||
616 | If you are unsure how to answer this question, answer N. | |
617 | ||
7af192c9 GH |
618 | config PARAVIRT_CLOCK |
619 | bool | |
7af192c9 | 620 | |
506f1d07 SR |
621 | endif |
622 | ||
97349135 | 623 | config PARAVIRT_DEBUG |
8f9ca475 IM |
624 | bool "paravirt-ops debugging" |
625 | depends on PARAVIRT && DEBUG_KERNEL | |
626 | ---help--- | |
627 | Enable to debug paravirt_ops internals. Specifically, BUG if | |
628 | a paravirt_op is missing when it is called. | |
97349135 | 629 | |
08677214 | 630 | config NO_BOOTMEM |
774ea0bc | 631 | def_bool y |
08677214 | 632 | |
03273184 YL |
633 | config MEMTEST |
634 | bool "Memtest" | |
8f9ca475 | 635 | ---help--- |
c64df707 | 636 | This option adds a kernel parameter 'memtest', which allows memtest |
03273184 | 637 | to be set. |
8f9ca475 IM |
638 | memtest=0, mean disabled; -- default |
639 | memtest=1, mean do 1 test pattern; | |
640 | ... | |
641 | memtest=4, mean do 4 test patterns. | |
aba3728c | 642 | If you are unsure how to answer this question, answer N. |
506f1d07 SR |
643 | |
644 | config X86_SUMMIT_NUMA | |
3c2362e6 | 645 | def_bool y |
e0c7ae37 | 646 | depends on X86_32 && NUMA && X86_32_NON_STANDARD |
506f1d07 SR |
647 | |
648 | config X86_CYCLONE_TIMER | |
3c2362e6 | 649 | def_bool y |
f9b15df4 | 650 | depends on X86_SUMMIT |
506f1d07 | 651 | |
506f1d07 SR |
652 | source "arch/x86/Kconfig.cpu" |
653 | ||
654 | config HPET_TIMER | |
3c2362e6 | 655 | def_bool X86_64 |
506f1d07 | 656 | prompt "HPET Timer Support" if X86_32 |
8f9ca475 IM |
657 | ---help--- |
658 | Use the IA-PC HPET (High Precision Event Timer) to manage | |
659 | time in preference to the PIT and RTC, if a HPET is | |
660 | present. | |
661 | HPET is the next generation timer replacing legacy 8254s. | |
662 | The HPET provides a stable time base on SMP | |
663 | systems, unlike the TSC, but it is more expensive to access, | |
664 | as it is off-chip. You can find the HPET spec at | |
665 | <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>. | |
506f1d07 | 666 | |
8f9ca475 IM |
667 | You can safely choose Y here. However, HPET will only be |
668 | activated if the platform and the BIOS support this feature. | |
669 | Otherwise the 8254 will be used for timing services. | |
506f1d07 | 670 | |
8f9ca475 | 671 | Choose N to continue using the legacy 8254 timer. |
506f1d07 SR |
672 | |
673 | config HPET_EMULATE_RTC | |
3c2362e6 | 674 | def_bool y |
9d8af78b | 675 | depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) |
506f1d07 | 676 | |
bb24c471 | 677 | config APB_TIMER |
933b9463 AC |
678 | def_bool y if X86_INTEL_MID |
679 | prompt "Intel MID APB Timer Support" if X86_INTEL_MID | |
06c3df49 | 680 | select DW_APB_TIMER |
a0c3832a | 681 | depends on X86_INTEL_MID && SFI |
bb24c471 JP |
682 | help |
683 | APB timer is the replacement for 8254, HPET on X86 MID platforms. | |
684 | The APBT provides a stable time base on SMP | |
685 | systems, unlike the TSC, but it is more expensive to access, | |
686 | as it is off-chip. APB timers are always running regardless of CPU | |
687 | C states, they are used as per CPU clockevent device when possible. | |
688 | ||
6a108a14 | 689 | # Mark as expert because too many people got it wrong. |
506f1d07 | 690 | # The code disables itself when not needed. |
7ae9392c TP |
691 | config DMI |
692 | default y | |
6a108a14 | 693 | bool "Enable DMI scanning" if EXPERT |
8f9ca475 | 694 | ---help--- |
7ae9392c TP |
695 | Enabled scanning of DMI to identify machine quirks. Say Y |
696 | here unless you have verified that your setup is not | |
697 | affected by entries in the DMI blacklist. Required by PNP | |
698 | BIOS code. | |
699 | ||
506f1d07 | 700 | config GART_IOMMU |
6a108a14 | 701 | bool "GART IOMMU support" if EXPERT |
506f1d07 SR |
702 | default y |
703 | select SWIOTLB | |
23ac4ae8 | 704 | depends on X86_64 && PCI && AMD_NB |
8f9ca475 | 705 | ---help--- |
506f1d07 SR |
706 | Support for full DMA access of devices with 32bit memory access only |
707 | on systems with more than 3GB. This is usually needed for USB, | |
708 | sound, many IDE/SATA chipsets and some other devices. | |
709 | Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART | |
710 | based hardware IOMMU and a software bounce buffer based IOMMU used | |
711 | on Intel systems and as fallback. | |
712 | The code is only active when needed (enough memory and limited | |
713 | device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified | |
714 | too. | |
715 | ||
716 | config CALGARY_IOMMU | |
717 | bool "IBM Calgary IOMMU support" | |
718 | select SWIOTLB | |
719 | depends on X86_64 && PCI && EXPERIMENTAL | |
8f9ca475 | 720 | ---help--- |
506f1d07 SR |
721 | Support for hardware IOMMUs in IBM's xSeries x366 and x460 |
722 | systems. Needed to run systems with more than 3GB of memory | |
723 | properly with 32-bit PCI devices that do not support DAC | |
724 | (Double Address Cycle). Calgary also supports bus level | |
725 | isolation, where all DMAs pass through the IOMMU. This | |
726 | prevents them from going anywhere except their intended | |
727 | destination. This catches hard-to-find kernel bugs and | |
728 | mis-behaving drivers and devices that do not use the DMA-API | |
729 | properly to set up their DMA buffers. The IOMMU can be | |
730 | turned off at boot time with the iommu=off parameter. | |
731 | Normally the kernel will make the right choice by itself. | |
732 | If unsure, say Y. | |
733 | ||
734 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT | |
3c2362e6 HH |
735 | def_bool y |
736 | prompt "Should Calgary be enabled by default?" | |
506f1d07 | 737 | depends on CALGARY_IOMMU |
8f9ca475 | 738 | ---help--- |
506f1d07 SR |
739 | Should Calgary be enabled by default? if you choose 'y', Calgary |
740 | will be used (if it exists). If you choose 'n', Calgary will not be | |
741 | used even if it exists. If you choose 'n' and would like to use | |
742 | Calgary anyway, pass 'iommu=calgary' on the kernel command line. | |
743 | If unsure, say Y. | |
744 | ||
745 | # need this always selected by IOMMU for the VIA workaround | |
746 | config SWIOTLB | |
a1afd01c | 747 | def_bool y if X86_64 |
8f9ca475 | 748 | ---help--- |
506f1d07 SR |
749 | Support for software bounce buffers used on x86-64 systems |
750 | which don't have a hardware IOMMU (e.g. the current generation | |
751 | of Intel's x86-64 CPUs). Using this PCI devices which can only | |
752 | access 32-bits of memory can be used on systems with more than | |
753 | 3 GB of memory. If unsure, say Y. | |
754 | ||
a8522509 | 755 | config IOMMU_HELPER |
18b743dc | 756 | def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU) |
d25e26b6 | 757 | |
1184dc2f | 758 | config MAXSMP |
ddb0c5a6 | 759 | bool "Enable Maximum number of SMP Processors and NUMA Nodes" |
36f5101a MT |
760 | depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL |
761 | select CPUMASK_OFFSTACK | |
8f9ca475 | 762 | ---help--- |
ddb0c5a6 | 763 | Enable maximum number of CPUS and NUMA Nodes for this architecture. |
1184dc2f | 764 | If unsure, say N. |
506f1d07 SR |
765 | |
766 | config NR_CPUS | |
36f5101a | 767 | int "Maximum number of CPUs" if SMP && !MAXSMP |
2a3313f4 | 768 | range 2 8 if SMP && X86_32 && !X86_BIGSMP |
36f5101a | 769 | range 2 512 if SMP && !MAXSMP |
78637a97 | 770 | default "1" if !SMP |
d25e26b6 | 771 | default "4096" if MAXSMP |
78637a97 MT |
772 | default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000) |
773 | default "8" if SMP | |
8f9ca475 | 774 | ---help--- |
506f1d07 | 775 | This allows you to specify the maximum number of CPUs which this |
d25e26b6 | 776 | kernel will support. The maximum supported value is 512 and the |
506f1d07 SR |
777 | minimum value which makes sense is 2. |
778 | ||
779 | This is purely to save memory - each supported CPU adds | |
780 | approximately eight kilobytes to the kernel image. | |
781 | ||
782 | config SCHED_SMT | |
783 | bool "SMT (Hyperthreading) scheduler support" | |
b089c12b | 784 | depends on X86_HT |
8f9ca475 | 785 | ---help--- |
506f1d07 SR |
786 | SMT scheduler support improves the CPU scheduler's decision making |
787 | when dealing with Intel Pentium 4 chips with HyperThreading at a | |
788 | cost of slightly increased overhead in some places. If unsure say | |
789 | N here. | |
790 | ||
791 | config SCHED_MC | |
3c2362e6 HH |
792 | def_bool y |
793 | prompt "Multi-core scheduler support" | |
b089c12b | 794 | depends on X86_HT |
8f9ca475 | 795 | ---help--- |
506f1d07 SR |
796 | Multi-core scheduler support improves the CPU scheduler's decision |
797 | making when dealing with multi-core CPU chips at a cost of slightly | |
798 | increased overhead in some places. If unsure say N here. | |
799 | ||
e82b8e4e VP |
800 | config IRQ_TIME_ACCOUNTING |
801 | bool "Fine granularity task level IRQ time accounting" | |
802 | default n | |
803 | ---help--- | |
804 | Select this option to enable fine granularity task irq time | |
805 | accounting. This is done by reading a timestamp on each | |
806 | transitions between softirq and hardirq state, so there can be a | |
807 | small performance impact. | |
808 | ||
809 | If in doubt, say N here. | |
810 | ||
506f1d07 SR |
811 | source "kernel/Kconfig.preempt" |
812 | ||
813 | config X86_UP_APIC | |
814 | bool "Local APIC support on uniprocessors" | |
e0c7ae37 | 815 | depends on X86_32 && !SMP && !X86_32_NON_STANDARD |
8f9ca475 | 816 | ---help--- |
506f1d07 SR |
817 | A local APIC (Advanced Programmable Interrupt Controller) is an |
818 | integrated interrupt controller in the CPU. If you have a single-CPU | |
819 | system which has a processor with a local APIC, you can say Y here to | |
820 | enable and use it. If you say Y here even though your machine doesn't | |
821 | have a local APIC, then the kernel will still run with no slowdown at | |
822 | all. The local APIC supports CPU-generated self-interrupts (timer, | |
823 | performance counters), and the NMI watchdog which detects hard | |
824 | lockups. | |
825 | ||
826 | config X86_UP_IOAPIC | |
827 | bool "IO-APIC support on uniprocessors" | |
828 | depends on X86_UP_APIC | |
8f9ca475 | 829 | ---help--- |
506f1d07 SR |
830 | An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an |
831 | SMP-capable replacement for PC-style interrupt controllers. Most | |
832 | SMP systems and many recent uniprocessor systems have one. | |
833 | ||
834 | If you have a single-CPU system with an IO-APIC, you can say Y here | |
835 | to use it. If you say Y here even though your machine doesn't have | |
836 | an IO-APIC, then the kernel will still run with no slowdown at all. | |
837 | ||
838 | config X86_LOCAL_APIC | |
3c2362e6 | 839 | def_bool y |
e0c7ae37 | 840 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC |
506f1d07 SR |
841 | |
842 | config X86_IO_APIC | |
3c2362e6 | 843 | def_bool y |
1444e0c9 | 844 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC |
506f1d07 SR |
845 | |
846 | config X86_VISWS_APIC | |
3c2362e6 | 847 | def_bool y |
506f1d07 | 848 | depends on X86_32 && X86_VISWS |
506f1d07 | 849 | |
41b9eb26 SA |
850 | config X86_REROUTE_FOR_BROKEN_BOOT_IRQS |
851 | bool "Reroute for broken boot IRQs" | |
41b9eb26 | 852 | depends on X86_IO_APIC |
8f9ca475 | 853 | ---help--- |
41b9eb26 SA |
854 | This option enables a workaround that fixes a source of |
855 | spurious interrupts. This is recommended when threaded | |
856 | interrupt handling is used on systems where the generation of | |
857 | superfluous "boot interrupts" cannot be disabled. | |
858 | ||
859 | Some chipsets generate a legacy INTx "boot IRQ" when the IRQ | |
860 | entry in the chipset's IO-APIC is masked (as, e.g. the RT | |
861 | kernel does during interrupt handling). On chipsets where this | |
862 | boot IRQ generation cannot be disabled, this workaround keeps | |
863 | the original IRQ line masked so that only the equivalent "boot | |
864 | IRQ" is delivered to the CPUs. The workaround also tells the | |
865 | kernel to set up the IRQ handler on the boot IRQ line. In this | |
866 | way only one interrupt is delivered to the kernel. Otherwise | |
867 | the spurious second interrupt may cause the kernel to bring | |
868 | down (vital) interrupt lines. | |
869 | ||
870 | Only affects "broken" chipsets. Interrupt sharing may be | |
871 | increased on these systems. | |
872 | ||
506f1d07 | 873 | config X86_MCE |
bab9bc65 | 874 | bool "Machine Check / overheating reporting" |
506f1d07 | 875 | ---help--- |
bab9bc65 AK |
876 | Machine Check support allows the processor to notify the |
877 | kernel if it detects a problem (e.g. overheating, data corruption). | |
506f1d07 | 878 | The action the kernel takes depends on the severity of the problem, |
bab9bc65 | 879 | ranging from warning messages to halting the machine. |
4efc0670 | 880 | |
506f1d07 | 881 | config X86_MCE_INTEL |
3c2362e6 HH |
882 | def_bool y |
883 | prompt "Intel MCE features" | |
c1ebf835 | 884 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 885 | ---help--- |
506f1d07 SR |
886 | Additional support for intel specific MCE features such as |
887 | the thermal monitor. | |
888 | ||
889 | config X86_MCE_AMD | |
3c2362e6 HH |
890 | def_bool y |
891 | prompt "AMD MCE features" | |
c1ebf835 | 892 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 893 | ---help--- |
506f1d07 SR |
894 | Additional support for AMD specific MCE features such as |
895 | the DRAM Error Threshold. | |
896 | ||
4efc0670 | 897 | config X86_ANCIENT_MCE |
6fc108a0 | 898 | bool "Support for old Pentium 5 / WinChip machine checks" |
c31d9633 | 899 | depends on X86_32 && X86_MCE |
cd13adcc HS |
900 | ---help--- |
901 | Include support for machine check handling on old Pentium 5 or WinChip | |
902 | systems. These typically need to be enabled explicitely on the command | |
903 | line. | |
4efc0670 | 904 | |
b2762686 AK |
905 | config X86_MCE_THRESHOLD |
906 | depends on X86_MCE_AMD || X86_MCE_INTEL | |
6fc108a0 | 907 | def_bool y |
b2762686 | 908 | |
ea149b36 | 909 | config X86_MCE_INJECT |
c1ebf835 | 910 | depends on X86_MCE |
ea149b36 AK |
911 | tristate "Machine check injector support" |
912 | ---help--- | |
913 | Provide support for injecting machine checks for testing purposes. | |
914 | If you don't know what a machine check is and you don't do kernel | |
915 | QA it is safe to say n. | |
916 | ||
4efc0670 AK |
917 | config X86_THERMAL_VECTOR |
918 | def_bool y | |
5bb38adc | 919 | depends on X86_MCE_INTEL |
4efc0670 | 920 | |
506f1d07 | 921 | config VM86 |
6a108a14 | 922 | bool "Enable VM86 support" if EXPERT |
506f1d07 SR |
923 | default y |
924 | depends on X86_32 | |
8f9ca475 IM |
925 | ---help--- |
926 | This option is required by programs like DOSEMU to run 16-bit legacy | |
506f1d07 | 927 | code on X86 processors. It also may be needed by software like |
8f9ca475 IM |
928 | XFree86 to initialize some video cards via BIOS. Disabling this |
929 | option saves about 6k. | |
506f1d07 SR |
930 | |
931 | config TOSHIBA | |
932 | tristate "Toshiba Laptop support" | |
933 | depends on X86_32 | |
934 | ---help--- | |
935 | This adds a driver to safely access the System Management Mode of | |
936 | the CPU on Toshiba portables with a genuine Toshiba BIOS. It does | |
937 | not work on models with a Phoenix BIOS. The System Management Mode | |
938 | is used to set the BIOS and power saving options on Toshiba portables. | |
939 | ||
940 | For information on utilities to make use of this driver see the | |
941 | Toshiba Linux utilities web site at: | |
942 | <http://www.buzzard.org.uk/toshiba/>. | |
943 | ||
944 | Say Y if you intend to run this kernel on a Toshiba portable. | |
945 | Say N otherwise. | |
946 | ||
947 | config I8K | |
948 | tristate "Dell laptop support" | |
949a9d70 | 949 | select HWMON |
506f1d07 SR |
950 | ---help--- |
951 | This adds a driver to safely access the System Management Mode | |
952 | of the CPU on the Dell Inspiron 8000. The System Management Mode | |
953 | is used to read cpu temperature and cooling fan status and to | |
954 | control the fans on the I8K portables. | |
955 | ||
956 | This driver has been tested only on the Inspiron 8000 but it may | |
957 | also work with other Dell laptops. You can force loading on other | |
958 | models by passing the parameter `force=1' to the module. Use at | |
959 | your own risk. | |
960 | ||
961 | For information on utilities to make use of this driver see the | |
962 | I8K Linux utilities web site at: | |
963 | <http://people.debian.org/~dz/i8k/> | |
964 | ||
965 | Say Y if you intend to run this kernel on a Dell Inspiron 8000. | |
966 | Say N otherwise. | |
967 | ||
968 | config X86_REBOOTFIXUPS | |
9ba16087 JB |
969 | bool "Enable X86 board specific fixups for reboot" |
970 | depends on X86_32 | |
506f1d07 SR |
971 | ---help--- |
972 | This enables chipset and/or board specific fixups to be done | |
973 | in order to get reboot to work correctly. This is only needed on | |
974 | some combinations of hardware and BIOS. The symptom, for which | |
975 | this config is intended, is when reboot ends with a stalled/hung | |
976 | system. | |
977 | ||
978 | Currently, the only fixup is for the Geode machines using | |
5e3a77e9 | 979 | CS5530A and CS5536 chipsets and the RDC R-321x SoC. |
506f1d07 SR |
980 | |
981 | Say Y if you want to enable the fixup. Currently, it's safe to | |
982 | enable this option even if you don't need it. | |
983 | Say N otherwise. | |
984 | ||
985 | config MICROCODE | |
8d86f390 | 986 | tristate "/dev/cpu/microcode - microcode support" |
506f1d07 SR |
987 | select FW_LOADER |
988 | ---help--- | |
989 | If you say Y here, you will be able to update the microcode on | |
80cc9f10 PO |
990 | certain Intel and AMD processors. The Intel support is for the |
991 | IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, | |
992 | Pentium 4, Xeon etc. The AMD support is for family 0x10 and | |
993 | 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra. | |
994 | You will obviously need the actual microcode binary data itself | |
995 | which is not shipped with the Linux kernel. | |
506f1d07 | 996 | |
8d86f390 PO |
997 | This option selects the general module only, you need to select |
998 | at least one vendor specific module as well. | |
506f1d07 SR |
999 | |
1000 | To compile this driver as a module, choose M here: the | |
1001 | module will be called microcode. | |
1002 | ||
8d86f390 | 1003 | config MICROCODE_INTEL |
8f9ca475 IM |
1004 | bool "Intel microcode patch loading support" |
1005 | depends on MICROCODE | |
1006 | default MICROCODE | |
1007 | select FW_LOADER | |
1008 | ---help--- | |
1009 | This options enables microcode patch loading support for Intel | |
1010 | processors. | |
1011 | ||
1012 | For latest news and information on obtaining all the required | |
1013 | Intel ingredients for this driver, check: | |
1014 | <http://www.urbanmyth.org/microcode/>. | |
8d86f390 | 1015 | |
80cc9f10 | 1016 | config MICROCODE_AMD |
8f9ca475 IM |
1017 | bool "AMD microcode patch loading support" |
1018 | depends on MICROCODE | |
1019 | select FW_LOADER | |
1020 | ---help--- | |
1021 | If you select this option, microcode patch loading support for AMD | |
1022 | processors will be enabled. | |
80cc9f10 | 1023 | |
8f9ca475 | 1024 | config MICROCODE_OLD_INTERFACE |
3c2362e6 | 1025 | def_bool y |
506f1d07 | 1026 | depends on MICROCODE |
506f1d07 SR |
1027 | |
1028 | config X86_MSR | |
1029 | tristate "/dev/cpu/*/msr - Model-specific register support" | |
8f9ca475 | 1030 | ---help--- |
506f1d07 SR |
1031 | This device gives privileged processes access to the x86 |
1032 | Model-Specific Registers (MSRs). It is a character device with | |
1033 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. | |
1034 | MSR accesses are directed to a specific CPU on multi-processor | |
1035 | systems. | |
1036 | ||
1037 | config X86_CPUID | |
1038 | tristate "/dev/cpu/*/cpuid - CPU information support" | |
8f9ca475 | 1039 | ---help--- |
506f1d07 SR |
1040 | This device gives processes access to the x86 CPUID instruction to |
1041 | be executed on a specific processor. It is a character device | |
1042 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to | |
1043 | /dev/cpu/31/cpuid. | |
1044 | ||
1045 | choice | |
1046 | prompt "High Memory Support" | |
506f1d07 | 1047 | default HIGHMEM64G if X86_NUMAQ |
6fc108a0 | 1048 | default HIGHMEM4G |
506f1d07 SR |
1049 | depends on X86_32 |
1050 | ||
1051 | config NOHIGHMEM | |
1052 | bool "off" | |
1053 | depends on !X86_NUMAQ | |
1054 | ---help--- | |
1055 | Linux can use up to 64 Gigabytes of physical memory on x86 systems. | |
1056 | However, the address space of 32-bit x86 processors is only 4 | |
1057 | Gigabytes large. That means that, if you have a large amount of | |
1058 | physical memory, not all of it can be "permanently mapped" by the | |
1059 | kernel. The physical memory that's not permanently mapped is called | |
1060 | "high memory". | |
1061 | ||
1062 | If you are compiling a kernel which will never run on a machine with | |
1063 | more than 1 Gigabyte total physical RAM, answer "off" here (default | |
1064 | choice and suitable for most users). This will result in a "3GB/1GB" | |
1065 | split: 3GB are mapped so that each process sees a 3GB virtual memory | |
1066 | space and the remaining part of the 4GB virtual memory space is used | |
1067 | by the kernel to permanently map as much physical memory as | |
1068 | possible. | |
1069 | ||
1070 | If the machine has between 1 and 4 Gigabytes physical RAM, then | |
1071 | answer "4GB" here. | |
1072 | ||
1073 | If more than 4 Gigabytes is used then answer "64GB" here. This | |
1074 | selection turns Intel PAE (Physical Address Extension) mode on. | |
1075 | PAE implements 3-level paging on IA32 processors. PAE is fully | |
1076 | supported by Linux, PAE mode is implemented on all recent Intel | |
1077 | processors (Pentium Pro and better). NOTE: If you say "64GB" here, | |
1078 | then the kernel will not boot on CPUs that don't support PAE! | |
1079 | ||
1080 | The actual amount of total physical memory will either be | |
1081 | auto detected or can be forced by using a kernel command line option | |
1082 | such as "mem=256M". (Try "man bootparam" or see the documentation of | |
1083 | your boot loader (lilo or loadlin) about how to pass options to the | |
1084 | kernel at boot time.) | |
1085 | ||
1086 | If unsure, say "off". | |
1087 | ||
1088 | config HIGHMEM4G | |
1089 | bool "4GB" | |
1090 | depends on !X86_NUMAQ | |
8f9ca475 | 1091 | ---help--- |
506f1d07 SR |
1092 | Select this if you have a 32-bit processor and between 1 and 4 |
1093 | gigabytes of physical RAM. | |
1094 | ||
1095 | config HIGHMEM64G | |
1096 | bool "64GB" | |
1097 | depends on !M386 && !M486 | |
1098 | select X86_PAE | |
8f9ca475 | 1099 | ---help--- |
506f1d07 SR |
1100 | Select this if you have a 32-bit processor and more than 4 |
1101 | gigabytes of physical RAM. | |
1102 | ||
1103 | endchoice | |
1104 | ||
1105 | choice | |
1106 | depends on EXPERIMENTAL | |
6a108a14 | 1107 | prompt "Memory split" if EXPERT |
506f1d07 SR |
1108 | default VMSPLIT_3G |
1109 | depends on X86_32 | |
8f9ca475 | 1110 | ---help--- |
506f1d07 SR |
1111 | Select the desired split between kernel and user memory. |
1112 | ||
1113 | If the address range available to the kernel is less than the | |
1114 | physical memory installed, the remaining memory will be available | |
1115 | as "high memory". Accessing high memory is a little more costly | |
1116 | than low memory, as it needs to be mapped into the kernel first. | |
1117 | Note that increasing the kernel address space limits the range | |
1118 | available to user programs, making the address space there | |
1119 | tighter. Selecting anything other than the default 3G/1G split | |
1120 | will also likely make your kernel incompatible with binary-only | |
1121 | kernel modules. | |
1122 | ||
1123 | If you are not absolutely sure what you are doing, leave this | |
1124 | option alone! | |
1125 | ||
1126 | config VMSPLIT_3G | |
1127 | bool "3G/1G user/kernel split" | |
1128 | config VMSPLIT_3G_OPT | |
1129 | depends on !X86_PAE | |
1130 | bool "3G/1G user/kernel split (for full 1G low memory)" | |
1131 | config VMSPLIT_2G | |
1132 | bool "2G/2G user/kernel split" | |
1133 | config VMSPLIT_2G_OPT | |
1134 | depends on !X86_PAE | |
1135 | bool "2G/2G user/kernel split (for full 2G low memory)" | |
1136 | config VMSPLIT_1G | |
1137 | bool "1G/3G user/kernel split" | |
1138 | endchoice | |
1139 | ||
1140 | config PAGE_OFFSET | |
1141 | hex | |
1142 | default 0xB0000000 if VMSPLIT_3G_OPT | |
1143 | default 0x80000000 if VMSPLIT_2G | |
1144 | default 0x78000000 if VMSPLIT_2G_OPT | |
1145 | default 0x40000000 if VMSPLIT_1G | |
1146 | default 0xC0000000 | |
1147 | depends on X86_32 | |
1148 | ||
1149 | config HIGHMEM | |
3c2362e6 | 1150 | def_bool y |
506f1d07 | 1151 | depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) |
506f1d07 SR |
1152 | |
1153 | config X86_PAE | |
9ba16087 | 1154 | bool "PAE (Physical Address Extension) Support" |
506f1d07 | 1155 | depends on X86_32 && !HIGHMEM4G |
8f9ca475 | 1156 | ---help--- |
506f1d07 SR |
1157 | PAE is required for NX support, and furthermore enables |
1158 | larger swapspace support for non-overcommit purposes. It | |
1159 | has the cost of more pagetable lookup overhead, and also | |
1160 | consumes more pagetable space per process. | |
1161 | ||
600715dc | 1162 | config ARCH_PHYS_ADDR_T_64BIT |
8f9ca475 | 1163 | def_bool X86_64 || X86_PAE |
600715dc | 1164 | |
66f2b061 FT |
1165 | config ARCH_DMA_ADDR_T_64BIT |
1166 | def_bool X86_64 || HIGHMEM64G | |
1167 | ||
9e899816 | 1168 | config DIRECT_GBPAGES |
6a108a14 | 1169 | bool "Enable 1GB pages for kernel pagetables" if EXPERT |
9e899816 NP |
1170 | default y |
1171 | depends on X86_64 | |
8f9ca475 | 1172 | ---help--- |
9e899816 NP |
1173 | Allow the kernel linear mapping to use 1GB pages on CPUs that |
1174 | support it. This can improve the kernel's performance a tiny bit by | |
1175 | reducing TLB pressure. If in doubt, say "Y". | |
1176 | ||
506f1d07 SR |
1177 | # Common NUMA Features |
1178 | config NUMA | |
fd51b2d7 | 1179 | bool "Numa Memory Allocation and Scheduler Support" |
506f1d07 | 1180 | depends on SMP |
604d2055 | 1181 | depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL) |
0699eae1 | 1182 | default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP) |
8f9ca475 | 1183 | ---help--- |
506f1d07 | 1184 | Enable NUMA (Non Uniform Memory Access) support. |
fd51b2d7 | 1185 | |
506f1d07 SR |
1186 | The kernel will try to allocate memory used by a CPU on the |
1187 | local memory controller of the CPU and add some more | |
1188 | NUMA awareness to the kernel. | |
1189 | ||
c280ea5e | 1190 | For 64-bit this is recommended if the system is Intel Core i7 |
fd51b2d7 KM |
1191 | (or later), AMD Opteron, or EM64T NUMA. |
1192 | ||
1193 | For 32-bit this is only needed on (rare) 32-bit-only platforms | |
1194 | that support NUMA topologies, such as NUMAQ / Summit, or if you | |
1195 | boot a 32-bit kernel on a 64-bit NUMA platform. | |
1196 | ||
1197 | Otherwise, you should say N. | |
506f1d07 SR |
1198 | |
1199 | comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI" | |
1200 | depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI) | |
1201 | ||
eec1d4fa | 1202 | config AMD_NUMA |
3c2362e6 HH |
1203 | def_bool y |
1204 | prompt "Old style AMD Opteron NUMA detection" | |
5da0ef9a | 1205 | depends on X86_64 && NUMA && PCI |
8f9ca475 | 1206 | ---help--- |
eec1d4fa HR |
1207 | Enable AMD NUMA node topology detection. You should say Y here if |
1208 | you have a multi processor AMD system. This uses an old method to | |
1209 | read the NUMA configuration directly from the builtin Northbridge | |
1210 | of Opteron. It is recommended to use X86_64_ACPI_NUMA instead, | |
1211 | which also takes priority if both are compiled in. | |
506f1d07 SR |
1212 | |
1213 | config X86_64_ACPI_NUMA | |
3c2362e6 HH |
1214 | def_bool y |
1215 | prompt "ACPI NUMA detection" | |
506f1d07 SR |
1216 | depends on X86_64 && NUMA && ACPI && PCI |
1217 | select ACPI_NUMA | |
8f9ca475 | 1218 | ---help--- |
506f1d07 SR |
1219 | Enable ACPI SRAT based node topology detection. |
1220 | ||
6ec6e0d9 SS |
1221 | # Some NUMA nodes have memory ranges that span |
1222 | # other nodes. Even though a pfn is valid and | |
1223 | # between a node's start and end pfns, it may not | |
1224 | # reside on that node. See memmap_init_zone() | |
1225 | # for details. | |
1226 | config NODES_SPAN_OTHER_NODES | |
1227 | def_bool y | |
1228 | depends on X86_64_ACPI_NUMA | |
1229 | ||
506f1d07 SR |
1230 | config NUMA_EMU |
1231 | bool "NUMA emulation" | |
1b7e03ef | 1232 | depends on NUMA |
8f9ca475 | 1233 | ---help--- |
506f1d07 SR |
1234 | Enable NUMA emulation. A flat machine will be split |
1235 | into virtual nodes when booted with "numa=fake=N", where N is the | |
1236 | number of nodes. This is only useful for debugging. | |
1237 | ||
1238 | config NODES_SHIFT | |
d25e26b6 | 1239 | int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP |
51591e31 DR |
1240 | range 1 10 |
1241 | default "10" if MAXSMP | |
506f1d07 SR |
1242 | default "6" if X86_64 |
1243 | default "4" if X86_NUMAQ | |
1244 | default "3" | |
1245 | depends on NEED_MULTIPLE_NODES | |
8f9ca475 | 1246 | ---help--- |
1184dc2f | 1247 | Specify the maximum number of NUMA Nodes available on the target |
692105b8 | 1248 | system. Increases memory reserved to accommodate various tables. |
506f1d07 | 1249 | |
3b16651f TH |
1250 | config HAVE_ARCH_ALLOC_REMAP |
1251 | def_bool y | |
1252 | depends on X86_32 && NUMA | |
1253 | ||
506f1d07 | 1254 | config ARCH_HAVE_MEMORY_PRESENT |
3c2362e6 | 1255 | def_bool y |
506f1d07 | 1256 | depends on X86_32 && DISCONTIGMEM |
506f1d07 SR |
1257 | |
1258 | config NEED_NODE_MEMMAP_SIZE | |
3c2362e6 | 1259 | def_bool y |
506f1d07 | 1260 | depends on X86_32 && (DISCONTIGMEM || SPARSEMEM) |
506f1d07 | 1261 | |
506f1d07 SR |
1262 | config ARCH_FLATMEM_ENABLE |
1263 | def_bool y | |
3b16651f | 1264 | depends on X86_32 && !NUMA |
506f1d07 SR |
1265 | |
1266 | config ARCH_DISCONTIGMEM_ENABLE | |
1267 | def_bool y | |
b263295d | 1268 | depends on NUMA && X86_32 |
506f1d07 SR |
1269 | |
1270 | config ARCH_DISCONTIGMEM_DEFAULT | |
1271 | def_bool y | |
b263295d CL |
1272 | depends on NUMA && X86_32 |
1273 | ||
506f1d07 SR |
1274 | config ARCH_SPARSEMEM_ENABLE |
1275 | def_bool y | |
4272ebfb | 1276 | depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD |
506f1d07 SR |
1277 | select SPARSEMEM_STATIC if X86_32 |
1278 | select SPARSEMEM_VMEMMAP_ENABLE if X86_64 | |
1279 | ||
3b16651f TH |
1280 | config ARCH_SPARSEMEM_DEFAULT |
1281 | def_bool y | |
1282 | depends on X86_64 | |
1283 | ||
506f1d07 SR |
1284 | config ARCH_SELECT_MEMORY_MODEL |
1285 | def_bool y | |
b263295d | 1286 | depends on ARCH_SPARSEMEM_ENABLE |
506f1d07 SR |
1287 | |
1288 | config ARCH_MEMORY_PROBE | |
1289 | def_bool X86_64 | |
1290 | depends on MEMORY_HOTPLUG | |
1291 | ||
3b16651f TH |
1292 | config ARCH_PROC_KCORE_TEXT |
1293 | def_bool y | |
1294 | depends on X86_64 && PROC_KCORE | |
1295 | ||
a29815a3 AK |
1296 | config ILLEGAL_POINTER_VALUE |
1297 | hex | |
1298 | default 0 if X86_32 | |
1299 | default 0xdead000000000000 if X86_64 | |
1300 | ||
506f1d07 SR |
1301 | source "mm/Kconfig" |
1302 | ||
1303 | config HIGHPTE | |
1304 | bool "Allocate 3rd-level pagetables from highmem" | |
6fc108a0 | 1305 | depends on HIGHMEM |
8f9ca475 | 1306 | ---help--- |
506f1d07 SR |
1307 | The VM uses one page table entry for each page of physical memory. |
1308 | For systems with a lot of RAM, this can be wasteful of precious | |
1309 | low memory. Setting this option will put user-space page table | |
1310 | entries in high memory. | |
1311 | ||
9f077871 | 1312 | config X86_CHECK_BIOS_CORRUPTION |
8f9ca475 IM |
1313 | bool "Check for low memory corruption" |
1314 | ---help--- | |
1315 | Periodically check for memory corruption in low memory, which | |
1316 | is suspected to be caused by BIOS. Even when enabled in the | |
1317 | configuration, it is disabled at runtime. Enable it by | |
1318 | setting "memory_corruption_check=1" on the kernel command | |
1319 | line. By default it scans the low 64k of memory every 60 | |
1320 | seconds; see the memory_corruption_check_size and | |
1321 | memory_corruption_check_period parameters in | |
1322 | Documentation/kernel-parameters.txt to adjust this. | |
1323 | ||
1324 | When enabled with the default parameters, this option has | |
1325 | almost no overhead, as it reserves a relatively small amount | |
1326 | of memory and scans it infrequently. It both detects corruption | |
1327 | and prevents it from affecting the running system. | |
1328 | ||
1329 | It is, however, intended as a diagnostic tool; if repeatable | |
1330 | BIOS-originated corruption always affects the same memory, | |
1331 | you can use memmap= to prevent the kernel from using that | |
1332 | memory. | |
9f077871 | 1333 | |
c885df50 | 1334 | config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK |
8f9ca475 | 1335 | bool "Set the default setting of memory_corruption_check" |
c885df50 JF |
1336 | depends on X86_CHECK_BIOS_CORRUPTION |
1337 | default y | |
8f9ca475 IM |
1338 | ---help--- |
1339 | Set whether the default state of memory_corruption_check is | |
1340 | on or off. | |
c885df50 | 1341 | |
9ea77bdb | 1342 | config X86_RESERVE_LOW |
d0cd7425 PA |
1343 | int "Amount of low memory, in kilobytes, to reserve for the BIOS" |
1344 | default 64 | |
1345 | range 4 640 | |
8f9ca475 | 1346 | ---help--- |
d0cd7425 PA |
1347 | Specify the amount of low memory to reserve for the BIOS. |
1348 | ||
1349 | The first page contains BIOS data structures that the kernel | |
1350 | must not use, so that page must always be reserved. | |
1351 | ||
1352 | By default we reserve the first 64K of physical RAM, as a | |
1353 | number of BIOSes are known to corrupt that memory range | |
1354 | during events such as suspend/resume or monitor cable | |
1355 | insertion, so it must not be used by the kernel. | |
fc381519 | 1356 | |
d0cd7425 PA |
1357 | You can set this to 4 if you are absolutely sure that you |
1358 | trust the BIOS to get all its memory reservations and usages | |
1359 | right. If you know your BIOS have problems beyond the | |
1360 | default 64K area, you can set this to 640 to avoid using the | |
1361 | entire low memory range. | |
fc381519 | 1362 | |
d0cd7425 PA |
1363 | If you have doubts about the BIOS (e.g. suspend/resume does |
1364 | not work or there's kernel crashes after certain hardware | |
1365 | hotplug events) then you might want to enable | |
1366 | X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check | |
1367 | typical corruption patterns. | |
fc381519 | 1368 | |
d0cd7425 | 1369 | Leave this to the default value of 64 if you are unsure. |
fc381519 | 1370 | |
506f1d07 SR |
1371 | config MATH_EMULATION |
1372 | bool | |
1373 | prompt "Math emulation" if X86_32 | |
1374 | ---help--- | |
1375 | Linux can emulate a math coprocessor (used for floating point | |
1376 | operations) if you don't have one. 486DX and Pentium processors have | |
1377 | a math coprocessor built in, 486SX and 386 do not, unless you added | |
1378 | a 487DX or 387, respectively. (The messages during boot time can | |
1379 | give you some hints here ["man dmesg"].) Everyone needs either a | |
1380 | coprocessor or this emulation. | |
1381 | ||
1382 | If you don't have a math coprocessor, you need to say Y here; if you | |
1383 | say Y here even though you have a coprocessor, the coprocessor will | |
1384 | be used nevertheless. (This behavior can be changed with the kernel | |
1385 | command line option "no387", which comes handy if your coprocessor | |
1386 | is broken. Try "man bootparam" or see the documentation of your boot | |
1387 | loader (lilo or loadlin) about how to pass options to the kernel at | |
1388 | boot time.) This means that it is a good idea to say Y here if you | |
1389 | intend to use this kernel on different machines. | |
1390 | ||
1391 | More information about the internals of the Linux math coprocessor | |
1392 | emulation can be found in <file:arch/x86/math-emu/README>. | |
1393 | ||
1394 | If you are not sure, say Y; apart from resulting in a 66 KB bigger | |
1395 | kernel, it won't hurt. | |
1396 | ||
1397 | config MTRR | |
6fc108a0 | 1398 | def_bool y |
6a108a14 | 1399 | prompt "MTRR (Memory Type Range Register) support" if EXPERT |
506f1d07 SR |
1400 | ---help--- |
1401 | On Intel P6 family processors (Pentium Pro, Pentium II and later) | |
1402 | the Memory Type Range Registers (MTRRs) may be used to control | |
1403 | processor access to memory ranges. This is most useful if you have | |
1404 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining | |
1405 | allows bus write transfers to be combined into a larger transfer | |
1406 | before bursting over the PCI/AGP bus. This can increase performance | |
1407 | of image write operations 2.5 times or more. Saying Y here creates a | |
1408 | /proc/mtrr file which may be used to manipulate your processor's | |
1409 | MTRRs. Typically the X server should use this. | |
1410 | ||
1411 | This code has a reasonably generic interface so that similar | |
1412 | control registers on other processors can be easily supported | |
1413 | as well: | |
1414 | ||
1415 | The Cyrix 6x86, 6x86MX and M II processors have Address Range | |
1416 | Registers (ARRs) which provide a similar functionality to MTRRs. For | |
1417 | these, the ARRs are used to emulate the MTRRs. | |
1418 | The AMD K6-2 (stepping 8 and above) and K6-3 processors have two | |
1419 | MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing | |
1420 | write-combining. All of these processors are supported by this code | |
1421 | and it makes sense to say Y here if you have one of them. | |
1422 | ||
1423 | Saying Y here also fixes a problem with buggy SMP BIOSes which only | |
1424 | set the MTRRs for the boot CPU and not for the secondary CPUs. This | |
1425 | can lead to all sorts of problems, so it's good to say Y here. | |
1426 | ||
1427 | You can safely say Y even if your machine doesn't have MTRRs, you'll | |
1428 | just add about 9 KB to your kernel. | |
1429 | ||
7225e751 | 1430 | See <file:Documentation/x86/mtrr.txt> for more information. |
506f1d07 | 1431 | |
95ffa243 | 1432 | config MTRR_SANITIZER |
2ffb3501 | 1433 | def_bool y |
95ffa243 YL |
1434 | prompt "MTRR cleanup support" |
1435 | depends on MTRR | |
8f9ca475 | 1436 | ---help--- |
aba3728c TG |
1437 | Convert MTRR layout from continuous to discrete, so X drivers can |
1438 | add writeback entries. | |
95ffa243 | 1439 | |
aba3728c | 1440 | Can be disabled with disable_mtrr_cleanup on the kernel command line. |
692105b8 | 1441 | The largest mtrr entry size for a continuous block can be set with |
aba3728c | 1442 | mtrr_chunk_size. |
95ffa243 | 1443 | |
2ffb3501 | 1444 | If unsure, say Y. |
95ffa243 YL |
1445 | |
1446 | config MTRR_SANITIZER_ENABLE_DEFAULT | |
f5098d62 YL |
1447 | int "MTRR cleanup enable value (0-1)" |
1448 | range 0 1 | |
1449 | default "0" | |
95ffa243 | 1450 | depends on MTRR_SANITIZER |
8f9ca475 | 1451 | ---help--- |
f5098d62 | 1452 | Enable mtrr cleanup default value |
95ffa243 | 1453 | |
12031a62 YL |
1454 | config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT |
1455 | int "MTRR cleanup spare reg num (0-7)" | |
1456 | range 0 7 | |
1457 | default "1" | |
1458 | depends on MTRR_SANITIZER | |
8f9ca475 | 1459 | ---help--- |
12031a62 | 1460 | mtrr cleanup spare entries default, it can be changed via |
aba3728c | 1461 | mtrr_spare_reg_nr=N on the kernel command line. |
12031a62 | 1462 | |
2e5d9c85 | 1463 | config X86_PAT |
6fc108a0 | 1464 | def_bool y |
6a108a14 | 1465 | prompt "x86 PAT support" if EXPERT |
2a8a2719 | 1466 | depends on MTRR |
8f9ca475 | 1467 | ---help--- |
2e5d9c85 | 1468 | Use PAT attributes to setup page level cache control. |
042b78e4 | 1469 | |
2e5d9c85 | 1470 | PATs are the modern equivalents of MTRRs and are much more |
1471 | flexible than MTRRs. | |
1472 | ||
1473 | Say N here if you see bootup problems (boot crash, boot hang, | |
042b78e4 | 1474 | spontaneous reboots) or a non-working video driver. |
2e5d9c85 | 1475 | |
1476 | If unsure, say Y. | |
1477 | ||
46cf98cd VP |
1478 | config ARCH_USES_PG_UNCACHED |
1479 | def_bool y | |
1480 | depends on X86_PAT | |
1481 | ||
628c6246 PA |
1482 | config ARCH_RANDOM |
1483 | def_bool y | |
1484 | prompt "x86 architectural random number generator" if EXPERT | |
1485 | ---help--- | |
1486 | Enable the x86 architectural RDRAND instruction | |
1487 | (Intel Bull Mountain technology) to generate random numbers. | |
1488 | If supported, this is a high bandwidth, cryptographically | |
1489 | secure hardware random number generator. | |
1490 | ||
506f1d07 | 1491 | config EFI |
9ba16087 | 1492 | bool "EFI runtime service support" |
5b83683f | 1493 | depends on ACPI |
506f1d07 | 1494 | ---help--- |
8f9ca475 IM |
1495 | This enables the kernel to use EFI runtime services that are |
1496 | available (such as the EFI variable services). | |
506f1d07 | 1497 | |
8f9ca475 IM |
1498 | This option is only useful on systems that have EFI firmware. |
1499 | In addition, you should use the latest ELILO loader available | |
1500 | at <http://elilo.sourceforge.net> in order to take advantage | |
1501 | of EFI runtime services. However, even with this option, the | |
1502 | resultant kernel should continue to boot on existing non-EFI | |
1503 | platforms. | |
506f1d07 | 1504 | |
291f3632 MF |
1505 | config EFI_STUB |
1506 | bool "EFI stub support" | |
1507 | depends on EFI | |
1508 | ---help--- | |
1509 | This kernel feature allows a bzImage to be loaded directly | |
1510 | by EFI firmware without the use of a bootloader. | |
1511 | ||
0c759662 MF |
1512 | See Documentation/x86/efi-stub.txt for more information. |
1513 | ||
506f1d07 | 1514 | config SECCOMP |
3c2362e6 HH |
1515 | def_bool y |
1516 | prompt "Enable seccomp to safely compute untrusted bytecode" | |
8f9ca475 | 1517 | ---help--- |
506f1d07 SR |
1518 | This kernel feature is useful for number crunching applications |
1519 | that may need to compute untrusted bytecode during their | |
1520 | execution. By using pipes or other transports made available to | |
1521 | the process as file descriptors supporting the read/write | |
1522 | syscalls, it's possible to isolate those applications in | |
1523 | their own address space using seccomp. Once seccomp is | |
9c0bbee8 | 1524 | enabled via prctl(PR_SET_SECCOMP), it cannot be disabled |
506f1d07 SR |
1525 | and the task is only allowed to execute a few safe syscalls |
1526 | defined by each seccomp mode. | |
1527 | ||
1528 | If unsure, say Y. Only embedded should say N here. | |
1529 | ||
1530 | config CC_STACKPROTECTOR | |
2a8ac745 | 1531 | bool "Enable -fstack-protector buffer overflow detection" |
8f9ca475 IM |
1532 | ---help--- |
1533 | This option turns on the -fstack-protector GCC feature. This | |
113c5413 IM |
1534 | feature puts, at the beginning of functions, a canary value on |
1535 | the stack just before the return address, and validates | |
506f1d07 SR |
1536 | the value just before actually returning. Stack based buffer |
1537 | overflows (that need to overwrite this return address) now also | |
1538 | overwrite the canary, which gets detected and the attack is then | |
1539 | neutralized via a kernel panic. | |
1540 | ||
1541 | This feature requires gcc version 4.2 or above, or a distribution | |
1542 | gcc with the feature backported. Older versions are automatically | |
113c5413 IM |
1543 | detected and for those versions, this configuration option is |
1544 | ignored. (and a warning is printed during bootup) | |
506f1d07 SR |
1545 | |
1546 | source kernel/Kconfig.hz | |
1547 | ||
1548 | config KEXEC | |
1549 | bool "kexec system call" | |
8f9ca475 | 1550 | ---help--- |
506f1d07 SR |
1551 | kexec is a system call that implements the ability to shutdown your |
1552 | current kernel, and to start another kernel. It is like a reboot | |
1553 | but it is independent of the system firmware. And like a reboot | |
1554 | you can start any kernel with it, not just Linux. | |
1555 | ||
1556 | The name comes from the similarity to the exec system call. | |
1557 | ||
1558 | It is an ongoing process to be certain the hardware in a machine | |
1559 | is properly shutdown, so do not be surprised if this code does not | |
1560 | initially work for you. It may help to enable device hotplugging | |
1561 | support. As of this writing the exact hardware interface is | |
1562 | strongly in flux, so no good recommendation can be made. | |
1563 | ||
1564 | config CRASH_DUMP | |
04b69447 | 1565 | bool "kernel crash dumps" |
506f1d07 | 1566 | depends on X86_64 || (X86_32 && HIGHMEM) |
8f9ca475 | 1567 | ---help--- |
506f1d07 SR |
1568 | Generate crash dump after being started by kexec. |
1569 | This should be normally only set in special crash dump kernels | |
1570 | which are loaded in the main kernel with kexec-tools into | |
1571 | a specially reserved region and then later executed after | |
1572 | a crash by kdump/kexec. The crash dump kernel must be compiled | |
1573 | to a memory address not used by the main kernel or BIOS using | |
1574 | PHYSICAL_START, or it must be built as a relocatable image | |
1575 | (CONFIG_RELOCATABLE=y). | |
1576 | For more details see Documentation/kdump/kdump.txt | |
1577 | ||
3ab83521 HY |
1578 | config KEXEC_JUMP |
1579 | bool "kexec jump (EXPERIMENTAL)" | |
1580 | depends on EXPERIMENTAL | |
fee7b0d8 | 1581 | depends on KEXEC && HIBERNATION |
8f9ca475 | 1582 | ---help--- |
89081d17 HY |
1583 | Jump between original kernel and kexeced kernel and invoke |
1584 | code in physical address mode via KEXEC | |
3ab83521 | 1585 | |
506f1d07 | 1586 | config PHYSICAL_START |
6a108a14 | 1587 | hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP) |
ceefccc9 | 1588 | default "0x1000000" |
8f9ca475 | 1589 | ---help--- |
506f1d07 SR |
1590 | This gives the physical address where the kernel is loaded. |
1591 | ||
1592 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then | |
1593 | bzImage will decompress itself to above physical address and | |
1594 | run from there. Otherwise, bzImage will run from the address where | |
1595 | it has been loaded by the boot loader and will ignore above physical | |
1596 | address. | |
1597 | ||
1598 | In normal kdump cases one does not have to set/change this option | |
1599 | as now bzImage can be compiled as a completely relocatable image | |
1600 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different | |
1601 | address. This option is mainly useful for the folks who don't want | |
1602 | to use a bzImage for capturing the crash dump and want to use a | |
1603 | vmlinux instead. vmlinux is not relocatable hence a kernel needs | |
1604 | to be specifically compiled to run from a specific memory area | |
1605 | (normally a reserved region) and this option comes handy. | |
1606 | ||
ceefccc9 PA |
1607 | So if you are using bzImage for capturing the crash dump, |
1608 | leave the value here unchanged to 0x1000000 and set | |
1609 | CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux | |
1610 | for capturing the crash dump change this value to start of | |
1611 | the reserved region. In other words, it can be set based on | |
1612 | the "X" value as specified in the "crashkernel=YM@XM" | |
1613 | command line boot parameter passed to the panic-ed | |
1614 | kernel. Please take a look at Documentation/kdump/kdump.txt | |
1615 | for more details about crash dumps. | |
506f1d07 SR |
1616 | |
1617 | Usage of bzImage for capturing the crash dump is recommended as | |
1618 | one does not have to build two kernels. Same kernel can be used | |
1619 | as production kernel and capture kernel. Above option should have | |
1620 | gone away after relocatable bzImage support is introduced. But it | |
1621 | is present because there are users out there who continue to use | |
1622 | vmlinux for dump capture. This option should go away down the | |
1623 | line. | |
1624 | ||
1625 | Don't change this unless you know what you are doing. | |
1626 | ||
1627 | config RELOCATABLE | |
26717808 PA |
1628 | bool "Build a relocatable kernel" |
1629 | default y | |
8f9ca475 | 1630 | ---help--- |
506f1d07 SR |
1631 | This builds a kernel image that retains relocation information |
1632 | so it can be loaded someplace besides the default 1MB. | |
1633 | The relocations tend to make the kernel binary about 10% larger, | |
1634 | but are discarded at runtime. | |
1635 | ||
1636 | One use is for the kexec on panic case where the recovery kernel | |
1637 | must live at a different physical address than the primary | |
1638 | kernel. | |
1639 | ||
1640 | Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address | |
1641 | it has been loaded at and the compile time physical address | |
1642 | (CONFIG_PHYSICAL_START) is ignored. | |
1643 | ||
845adf72 PA |
1644 | # Relocation on x86-32 needs some additional build support |
1645 | config X86_NEED_RELOCS | |
1646 | def_bool y | |
1647 | depends on X86_32 && RELOCATABLE | |
1648 | ||
506f1d07 | 1649 | config PHYSICAL_ALIGN |
6fc108a0 | 1650 | hex "Alignment value to which kernel should be aligned" if X86_32 |
ceefccc9 PA |
1651 | default "0x1000000" |
1652 | range 0x2000 0x1000000 | |
8f9ca475 | 1653 | ---help--- |
506f1d07 SR |
1654 | This value puts the alignment restrictions on physical address |
1655 | where kernel is loaded and run from. Kernel is compiled for an | |
1656 | address which meets above alignment restriction. | |
1657 | ||
1658 | If bootloader loads the kernel at a non-aligned address and | |
1659 | CONFIG_RELOCATABLE is set, kernel will move itself to nearest | |
1660 | address aligned to above value and run from there. | |
1661 | ||
1662 | If bootloader loads the kernel at a non-aligned address and | |
1663 | CONFIG_RELOCATABLE is not set, kernel will ignore the run time | |
1664 | load address and decompress itself to the address it has been | |
1665 | compiled for and run from there. The address for which kernel is | |
1666 | compiled already meets above alignment restrictions. Hence the | |
1667 | end result is that kernel runs from a physical address meeting | |
1668 | above alignment restrictions. | |
1669 | ||
1670 | Don't change this unless you know what you are doing. | |
1671 | ||
1672 | config HOTPLUG_CPU | |
7c13e6a3 | 1673 | bool "Support for hot-pluggable CPUs" |
4b19ed91 | 1674 | depends on SMP && HOTPLUG |
506f1d07 | 1675 | ---help--- |
7c13e6a3 DS |
1676 | Say Y here to allow turning CPUs off and on. CPUs can be |
1677 | controlled through /sys/devices/system/cpu. | |
1678 | ( Note: power management support will enable this option | |
1679 | automatically on SMP systems. ) | |
1680 | Say N if you want to disable CPU hotplug. | |
506f1d07 SR |
1681 | |
1682 | config COMPAT_VDSO | |
3c2362e6 HH |
1683 | def_bool y |
1684 | prompt "Compat VDSO support" | |
af65d648 | 1685 | depends on X86_32 || IA32_EMULATION |
8f9ca475 | 1686 | ---help--- |
af65d648 | 1687 | Map the 32-bit VDSO to the predictable old-style address too. |
e84446de | 1688 | |
506f1d07 SR |
1689 | Say N here if you are running a sufficiently recent glibc |
1690 | version (2.3.3 or later), to remove the high-mapped | |
1691 | VDSO mapping and to exclusively use the randomized VDSO. | |
1692 | ||
1693 | If unsure, say Y. | |
1694 | ||
516cbf37 TB |
1695 | config CMDLINE_BOOL |
1696 | bool "Built-in kernel command line" | |
8f9ca475 | 1697 | ---help--- |
516cbf37 TB |
1698 | Allow for specifying boot arguments to the kernel at |
1699 | build time. On some systems (e.g. embedded ones), it is | |
1700 | necessary or convenient to provide some or all of the | |
1701 | kernel boot arguments with the kernel itself (that is, | |
1702 | to not rely on the boot loader to provide them.) | |
1703 | ||
1704 | To compile command line arguments into the kernel, | |
1705 | set this option to 'Y', then fill in the | |
1706 | the boot arguments in CONFIG_CMDLINE. | |
1707 | ||
1708 | Systems with fully functional boot loaders (i.e. non-embedded) | |
1709 | should leave this option set to 'N'. | |
1710 | ||
1711 | config CMDLINE | |
1712 | string "Built-in kernel command string" | |
1713 | depends on CMDLINE_BOOL | |
1714 | default "" | |
8f9ca475 | 1715 | ---help--- |
516cbf37 TB |
1716 | Enter arguments here that should be compiled into the kernel |
1717 | image and used at boot time. If the boot loader provides a | |
1718 | command line at boot time, it is appended to this string to | |
1719 | form the full kernel command line, when the system boots. | |
1720 | ||
1721 | However, you can use the CONFIG_CMDLINE_OVERRIDE option to | |
1722 | change this behavior. | |
1723 | ||
1724 | In most cases, the command line (whether built-in or provided | |
1725 | by the boot loader) should specify the device for the root | |
1726 | file system. | |
1727 | ||
1728 | config CMDLINE_OVERRIDE | |
1729 | bool "Built-in command line overrides boot loader arguments" | |
516cbf37 | 1730 | depends on CMDLINE_BOOL |
8f9ca475 | 1731 | ---help--- |
516cbf37 TB |
1732 | Set this option to 'Y' to have the kernel ignore the boot loader |
1733 | command line, and use ONLY the built-in command line. | |
1734 | ||
1735 | This is used to work around broken boot loaders. This should | |
1736 | be set to 'N' under normal conditions. | |
1737 | ||
506f1d07 SR |
1738 | endmenu |
1739 | ||
1740 | config ARCH_ENABLE_MEMORY_HOTPLUG | |
1741 | def_bool y | |
1742 | depends on X86_64 || (X86_32 && HIGHMEM) | |
1743 | ||
35551053 GH |
1744 | config ARCH_ENABLE_MEMORY_HOTREMOVE |
1745 | def_bool y | |
1746 | depends on MEMORY_HOTPLUG | |
1747 | ||
e534c7c5 | 1748 | config USE_PERCPU_NUMA_NODE_ID |
645a7919 | 1749 | def_bool y |
e534c7c5 LS |
1750 | depends on NUMA |
1751 | ||
da85f865 | 1752 | menu "Power management and ACPI options" |
e279b6c1 SR |
1753 | |
1754 | config ARCH_HIBERNATION_HEADER | |
3c2362e6 | 1755 | def_bool y |
e279b6c1 | 1756 | depends on X86_64 && HIBERNATION |
e279b6c1 SR |
1757 | |
1758 | source "kernel/power/Kconfig" | |
1759 | ||
1760 | source "drivers/acpi/Kconfig" | |
1761 | ||
efafc8b2 FT |
1762 | source "drivers/sfi/Kconfig" |
1763 | ||
a6b68076 | 1764 | config X86_APM_BOOT |
6fc108a0 | 1765 | def_bool y |
282e5aab | 1766 | depends on APM |
a6b68076 | 1767 | |
e279b6c1 SR |
1768 | menuconfig APM |
1769 | tristate "APM (Advanced Power Management) BIOS support" | |
efefa6f6 | 1770 | depends on X86_32 && PM_SLEEP |
e279b6c1 SR |
1771 | ---help--- |
1772 | APM is a BIOS specification for saving power using several different | |
1773 | techniques. This is mostly useful for battery powered laptops with | |
1774 | APM compliant BIOSes. If you say Y here, the system time will be | |
1775 | reset after a RESUME operation, the /proc/apm device will provide | |
1776 | battery status information, and user-space programs will receive | |
1777 | notification of APM "events" (e.g. battery status change). | |
1778 | ||
1779 | If you select "Y" here, you can disable actual use of the APM | |
1780 | BIOS by passing the "apm=off" option to the kernel at boot time. | |
1781 | ||
1782 | Note that the APM support is almost completely disabled for | |
1783 | machines with more than one CPU. | |
1784 | ||
1785 | In order to use APM, you will need supporting software. For location | |
2dc98fd3 MW |
1786 | and more information, read <file:Documentation/power/apm-acpi.txt> |
1787 | and the Battery Powered Linux mini-HOWTO, available from | |
e279b6c1 SR |
1788 | <http://www.tldp.org/docs.html#howto>. |
1789 | ||
1790 | This driver does not spin down disk drives (see the hdparm(8) | |
1791 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
1792 | VESA-compliant "green" monitors. | |
1793 | ||
1794 | This driver does not support the TI 4000M TravelMate and the ACER | |
1795 | 486/DX4/75 because they don't have compliant BIOSes. Many "green" | |
1796 | desktop machines also don't have compliant BIOSes, and this driver | |
1797 | may cause those machines to panic during the boot phase. | |
1798 | ||
1799 | Generally, if you don't have a battery in your machine, there isn't | |
1800 | much point in using this driver and you should say N. If you get | |
1801 | random kernel OOPSes or reboots that don't seem to be related to | |
1802 | anything, try disabling/enabling this option (or disabling/enabling | |
1803 | APM in your BIOS). | |
1804 | ||
1805 | Some other things you should try when experiencing seemingly random, | |
1806 | "weird" problems: | |
1807 | ||
1808 | 1) make sure that you have enough swap space and that it is | |
1809 | enabled. | |
1810 | 2) pass the "no-hlt" option to the kernel | |
1811 | 3) switch on floating point emulation in the kernel and pass | |
1812 | the "no387" option to the kernel | |
1813 | 4) pass the "floppy=nodma" option to the kernel | |
1814 | 5) pass the "mem=4M" option to the kernel (thereby disabling | |
1815 | all but the first 4 MB of RAM) | |
1816 | 6) make sure that the CPU is not over clocked. | |
1817 | 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> | |
1818 | 8) disable the cache from your BIOS settings | |
1819 | 9) install a fan for the video card or exchange video RAM | |
1820 | 10) install a better fan for the CPU | |
1821 | 11) exchange RAM chips | |
1822 | 12) exchange the motherboard. | |
1823 | ||
1824 | To compile this driver as a module, choose M here: the | |
1825 | module will be called apm. | |
1826 | ||
1827 | if APM | |
1828 | ||
1829 | config APM_IGNORE_USER_SUSPEND | |
1830 | bool "Ignore USER SUSPEND" | |
8f9ca475 | 1831 | ---help--- |
e279b6c1 SR |
1832 | This option will ignore USER SUSPEND requests. On machines with a |
1833 | compliant APM BIOS, you want to say N. However, on the NEC Versa M | |
1834 | series notebooks, it is necessary to say Y because of a BIOS bug. | |
1835 | ||
1836 | config APM_DO_ENABLE | |
1837 | bool "Enable PM at boot time" | |
1838 | ---help--- | |
1839 | Enable APM features at boot time. From page 36 of the APM BIOS | |
1840 | specification: "When disabled, the APM BIOS does not automatically | |
1841 | power manage devices, enter the Standby State, enter the Suspend | |
1842 | State, or take power saving steps in response to CPU Idle calls." | |
1843 | This driver will make CPU Idle calls when Linux is idle (unless this | |
1844 | feature is turned off -- see "Do CPU IDLE calls", below). This | |
1845 | should always save battery power, but more complicated APM features | |
1846 | will be dependent on your BIOS implementation. You may need to turn | |
1847 | this option off if your computer hangs at boot time when using APM | |
1848 | support, or if it beeps continuously instead of suspending. Turn | |
1849 | this off if you have a NEC UltraLite Versa 33/C or a Toshiba | |
1850 | T400CDT. This is off by default since most machines do fine without | |
1851 | this feature. | |
1852 | ||
1853 | config APM_CPU_IDLE | |
1854 | bool "Make CPU Idle calls when idle" | |
8f9ca475 | 1855 | ---help--- |
e279b6c1 SR |
1856 | Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. |
1857 | On some machines, this can activate improved power savings, such as | |
1858 | a slowed CPU clock rate, when the machine is idle. These idle calls | |
1859 | are made after the idle loop has run for some length of time (e.g., | |
1860 | 333 mS). On some machines, this will cause a hang at boot time or | |
1861 | whenever the CPU becomes idle. (On machines with more than one CPU, | |
1862 | this option does nothing.) | |
1863 | ||
1864 | config APM_DISPLAY_BLANK | |
1865 | bool "Enable console blanking using APM" | |
8f9ca475 | 1866 | ---help--- |
e279b6c1 SR |
1867 | Enable console blanking using the APM. Some laptops can use this to |
1868 | turn off the LCD backlight when the screen blanker of the Linux | |
1869 | virtual console blanks the screen. Note that this is only used by | |
1870 | the virtual console screen blanker, and won't turn off the backlight | |
1871 | when using the X Window system. This also doesn't have anything to | |
1872 | do with your VESA-compliant power-saving monitor. Further, this | |
1873 | option doesn't work for all laptops -- it might not turn off your | |
1874 | backlight at all, or it might print a lot of errors to the console, | |
1875 | especially if you are using gpm. | |
1876 | ||
1877 | config APM_ALLOW_INTS | |
1878 | bool "Allow interrupts during APM BIOS calls" | |
8f9ca475 | 1879 | ---help--- |
e279b6c1 SR |
1880 | Normally we disable external interrupts while we are making calls to |
1881 | the APM BIOS as a measure to lessen the effects of a badly behaving | |
1882 | BIOS implementation. The BIOS should reenable interrupts if it | |
1883 | needs to. Unfortunately, some BIOSes do not -- especially those in | |
1884 | many of the newer IBM Thinkpads. If you experience hangs when you | |
1885 | suspend, try setting this to Y. Otherwise, say N. | |
1886 | ||
e279b6c1 SR |
1887 | endif # APM |
1888 | ||
bb0a56ec | 1889 | source "drivers/cpufreq/Kconfig" |
e279b6c1 SR |
1890 | |
1891 | source "drivers/cpuidle/Kconfig" | |
1892 | ||
27471fdb AH |
1893 | source "drivers/idle/Kconfig" |
1894 | ||
e279b6c1 SR |
1895 | endmenu |
1896 | ||
1897 | ||
1898 | menu "Bus options (PCI etc.)" | |
1899 | ||
1900 | config PCI | |
1ac97018 | 1901 | bool "PCI support" |
1c858087 | 1902 | default y |
e279b6c1 | 1903 | select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC) |
8f9ca475 | 1904 | ---help--- |
e279b6c1 SR |
1905 | Find out whether you have a PCI motherboard. PCI is the name of a |
1906 | bus system, i.e. the way the CPU talks to the other stuff inside | |
1907 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | |
1908 | VESA. If you have PCI, say Y, otherwise N. | |
1909 | ||
e279b6c1 SR |
1910 | choice |
1911 | prompt "PCI access mode" | |
efefa6f6 | 1912 | depends on X86_32 && PCI |
e279b6c1 SR |
1913 | default PCI_GOANY |
1914 | ---help--- | |
1915 | On PCI systems, the BIOS can be used to detect the PCI devices and | |
1916 | determine their configuration. However, some old PCI motherboards | |
1917 | have BIOS bugs and may crash if this is done. Also, some embedded | |
1918 | PCI-based systems don't have any BIOS at all. Linux can also try to | |
1919 | detect the PCI hardware directly without using the BIOS. | |
1920 | ||
1921 | With this option, you can specify how Linux should detect the | |
1922 | PCI devices. If you choose "BIOS", the BIOS will be used, | |
1923 | if you choose "Direct", the BIOS won't be used, and if you | |
1924 | choose "MMConfig", then PCI Express MMCONFIG will be used. | |
1925 | If you choose "Any", the kernel will try MMCONFIG, then the | |
1926 | direct access method and falls back to the BIOS if that doesn't | |
1927 | work. If unsure, go with the default, which is "Any". | |
1928 | ||
1929 | config PCI_GOBIOS | |
1930 | bool "BIOS" | |
1931 | ||
1932 | config PCI_GOMMCONFIG | |
1933 | bool "MMConfig" | |
1934 | ||
1935 | config PCI_GODIRECT | |
1936 | bool "Direct" | |
1937 | ||
3ef0e1f8 | 1938 | config PCI_GOOLPC |
76fb6570 | 1939 | bool "OLPC XO-1" |
3ef0e1f8 AS |
1940 | depends on OLPC |
1941 | ||
2bdd1b03 AS |
1942 | config PCI_GOANY |
1943 | bool "Any" | |
1944 | ||
e279b6c1 SR |
1945 | endchoice |
1946 | ||
1947 | config PCI_BIOS | |
3c2362e6 | 1948 | def_bool y |
efefa6f6 | 1949 | depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY) |
e279b6c1 SR |
1950 | |
1951 | # x86-64 doesn't support PCI BIOS access from long mode so always go direct. | |
1952 | config PCI_DIRECT | |
3c2362e6 | 1953 | def_bool y |
0aba496f | 1954 | depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG)) |
e279b6c1 SR |
1955 | |
1956 | config PCI_MMCONFIG | |
3c2362e6 | 1957 | def_bool y |
5f0db7a2 | 1958 | depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY) |
e279b6c1 | 1959 | |
3ef0e1f8 | 1960 | config PCI_OLPC |
2bdd1b03 AS |
1961 | def_bool y |
1962 | depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY) | |
3ef0e1f8 | 1963 | |
b5401a96 AN |
1964 | config PCI_XEN |
1965 | def_bool y | |
1966 | depends on PCI && XEN | |
1967 | select SWIOTLB_XEN | |
1968 | ||
e279b6c1 | 1969 | config PCI_DOMAINS |
3c2362e6 | 1970 | def_bool y |
e279b6c1 | 1971 | depends on PCI |
e279b6c1 SR |
1972 | |
1973 | config PCI_MMCONFIG | |
1974 | bool "Support mmconfig PCI config space access" | |
1975 | depends on X86_64 && PCI && ACPI | |
1976 | ||
3f6ea84a | 1977 | config PCI_CNB20LE_QUIRK |
6a108a14 | 1978 | bool "Read CNB20LE Host Bridge Windows" if EXPERT |
64a5fed6 BH |
1979 | default n |
1980 | depends on PCI && EXPERIMENTAL | |
3f6ea84a IS |
1981 | help |
1982 | Read the PCI windows out of the CNB20LE host bridge. This allows | |
1983 | PCI hotplug to work on systems with the CNB20LE chipset which do | |
1984 | not have ACPI. | |
1985 | ||
64a5fed6 BH |
1986 | There's no public spec for this chipset, and this functionality |
1987 | is known to be incomplete. | |
1988 | ||
1989 | You should say N unless you know you need this. | |
1990 | ||
e279b6c1 SR |
1991 | source "drivers/pci/pcie/Kconfig" |
1992 | ||
1993 | source "drivers/pci/Kconfig" | |
1994 | ||
1c00f016 | 1995 | # x86_64 have no ISA slots, but can have ISA-style DMA. |
e279b6c1 | 1996 | config ISA_DMA_API |
1c00f016 DR |
1997 | bool "ISA-style DMA support" if (X86_64 && EXPERT) |
1998 | default y | |
1999 | help | |
2000 | Enables ISA-style DMA support for devices requiring such controllers. | |
2001 | If unsure, say Y. | |
e279b6c1 SR |
2002 | |
2003 | if X86_32 | |
2004 | ||
2005 | config ISA | |
2006 | bool "ISA support" | |
8f9ca475 | 2007 | ---help--- |
e279b6c1 SR |
2008 | Find out whether you have ISA slots on your motherboard. ISA is the |
2009 | name of a bus system, i.e. the way the CPU talks to the other stuff | |
2010 | inside your box. Other bus systems are PCI, EISA, MicroChannel | |
2011 | (MCA) or VESA. ISA is an older system, now being displaced by PCI; | |
2012 | newer boards don't support it. If you have ISA, say Y, otherwise N. | |
2013 | ||
2014 | config EISA | |
2015 | bool "EISA support" | |
2016 | depends on ISA | |
2017 | ---help--- | |
2018 | The Extended Industry Standard Architecture (EISA) bus was | |
2019 | developed as an open alternative to the IBM MicroChannel bus. | |
2020 | ||
2021 | The EISA bus provided some of the features of the IBM MicroChannel | |
2022 | bus while maintaining backward compatibility with cards made for | |
2023 | the older ISA bus. The EISA bus saw limited use between 1988 and | |
2024 | 1995 when it was made obsolete by the PCI bus. | |
2025 | ||
2026 | Say Y here if you are building a kernel for an EISA-based machine. | |
2027 | ||
2028 | Otherwise, say N. | |
2029 | ||
2030 | source "drivers/eisa/Kconfig" | |
2031 | ||
e279b6c1 SR |
2032 | config SCx200 |
2033 | tristate "NatSemi SCx200 support" | |
8f9ca475 | 2034 | ---help--- |
e279b6c1 SR |
2035 | This provides basic support for National Semiconductor's |
2036 | (now AMD's) Geode processors. The driver probes for the | |
2037 | PCI-IDs of several on-chip devices, so its a good dependency | |
2038 | for other scx200_* drivers. | |
2039 | ||
2040 | If compiled as a module, the driver is named scx200. | |
2041 | ||
2042 | config SCx200HR_TIMER | |
2043 | tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" | |
592913ec | 2044 | depends on SCx200 |
e279b6c1 | 2045 | default y |
8f9ca475 | 2046 | ---help--- |
e279b6c1 SR |
2047 | This driver provides a clocksource built upon the on-chip |
2048 | 27MHz high-resolution timer. Its also a workaround for | |
2049 | NSC Geode SC-1100's buggy TSC, which loses time when the | |
2050 | processor goes idle (as is done by the scheduler). The | |
2051 | other workaround is idle=poll boot option. | |
2052 | ||
3ef0e1f8 AS |
2053 | config OLPC |
2054 | bool "One Laptop Per Child support" | |
54008979 | 2055 | depends on !X86_PAE |
3c554946 | 2056 | select GPIOLIB |
dc3119e7 | 2057 | select OF |
45bb1674 | 2058 | select OF_PROMTREE |
b4e51854 | 2059 | select IRQ_DOMAIN |
8f9ca475 | 2060 | ---help--- |
3ef0e1f8 AS |
2061 | Add support for detecting the unique features of the OLPC |
2062 | XO hardware. | |
2063 | ||
a3128588 DD |
2064 | config OLPC_XO1_PM |
2065 | bool "OLPC XO-1 Power Management" | |
97c4cb71 | 2066 | depends on OLPC && MFD_CS5535 && PM_SLEEP |
a3128588 | 2067 | select MFD_CORE |
bf1ebf00 | 2068 | ---help--- |
97c4cb71 | 2069 | Add support for poweroff and suspend of the OLPC XO-1 laptop. |
bf1ebf00 | 2070 | |
cfee9597 DD |
2071 | config OLPC_XO1_RTC |
2072 | bool "OLPC XO-1 Real Time Clock" | |
2073 | depends on OLPC_XO1_PM && RTC_DRV_CMOS | |
2074 | ---help--- | |
2075 | Add support for the XO-1 real time clock, which can be used as a | |
2076 | programmable wakeup source. | |
2077 | ||
7feda8e9 DD |
2078 | config OLPC_XO1_SCI |
2079 | bool "OLPC XO-1 SCI extras" | |
d8d01a63 DD |
2080 | depends on OLPC && OLPC_XO1_PM |
2081 | select POWER_SUPPLY | |
7feda8e9 DD |
2082 | select GPIO_CS5535 |
2083 | select MFD_CORE | |
2084 | ---help--- | |
2085 | Add support for SCI-based features of the OLPC XO-1 laptop: | |
7bc74b3d | 2086 | - EC-driven system wakeups |
7feda8e9 | 2087 | - Power button |
7bc74b3d | 2088 | - Ebook switch |
2cf2baea | 2089 | - Lid switch |
e1040ac6 DD |
2090 | - AC adapter status updates |
2091 | - Battery status updates | |
7feda8e9 | 2092 | |
a0f30f59 DD |
2093 | config OLPC_XO15_SCI |
2094 | bool "OLPC XO-1.5 SCI extras" | |
d8d01a63 DD |
2095 | depends on OLPC && ACPI |
2096 | select POWER_SUPPLY | |
a0f30f59 DD |
2097 | ---help--- |
2098 | Add support for SCI-based features of the OLPC XO-1.5 laptop: | |
2099 | - EC-driven system wakeups | |
2100 | - AC adapter status updates | |
2101 | - Battery status updates | |
bf1ebf00 | 2102 | |
d4f3e350 EW |
2103 | config ALIX |
2104 | bool "PCEngines ALIX System Support (LED setup)" | |
2105 | select GPIOLIB | |
2106 | ---help--- | |
2107 | This option enables system support for the PCEngines ALIX. | |
2108 | At present this just sets up LEDs for GPIO control on | |
2109 | ALIX2/3/6 boards. However, other system specific setup should | |
2110 | get added here. | |
2111 | ||
2112 | Note: You must still enable the drivers for GPIO and LED support | |
2113 | (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs | |
2114 | ||
2115 | Note: You have to set alix.force=1 for boards with Award BIOS. | |
2116 | ||
da4e3302 PP |
2117 | config NET5501 |
2118 | bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)" | |
2119 | select GPIOLIB | |
2120 | ---help--- | |
2121 | This option enables system support for the Soekris Engineering net5501. | |
2122 | ||
3197059a PP |
2123 | config GEOS |
2124 | bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)" | |
2125 | select GPIOLIB | |
2126 | depends on DMI | |
2127 | ---help--- | |
2128 | This option enables system support for the Traverse Technologies GEOS. | |
2129 | ||
bc0120fd SR |
2130 | endif # X86_32 |
2131 | ||
23ac4ae8 | 2132 | config AMD_NB |
e279b6c1 | 2133 | def_bool y |
0e152cd7 | 2134 | depends on CPU_SUP_AMD && PCI |
e279b6c1 SR |
2135 | |
2136 | source "drivers/pcmcia/Kconfig" | |
2137 | ||
2138 | source "drivers/pci/hotplug/Kconfig" | |
2139 | ||
388b78ad AB |
2140 | config RAPIDIO |
2141 | bool "RapidIO support" | |
2142 | depends on PCI | |
2143 | default n | |
2144 | help | |
2145 | If you say Y here, the kernel will include drivers and | |
2146 | infrastructure code to support RapidIO interconnect devices. | |
2147 | ||
2148 | source "drivers/rapidio/Kconfig" | |
2149 | ||
e279b6c1 SR |
2150 | endmenu |
2151 | ||
2152 | ||
2153 | menu "Executable file formats / Emulations" | |
2154 | ||
2155 | source "fs/Kconfig.binfmt" | |
2156 | ||
2157 | config IA32_EMULATION | |
2158 | bool "IA32 Emulation" | |
2159 | depends on X86_64 | |
a97f52e6 | 2160 | select COMPAT_BINFMT_ELF |
8f9ca475 | 2161 | ---help--- |
5fd92e65 L |
2162 | Include code to run legacy 32-bit programs under a |
2163 | 64-bit kernel. You should likely turn this on, unless you're | |
2164 | 100% sure that you don't have any 32-bit programs left. | |
e279b6c1 SR |
2165 | |
2166 | config IA32_AOUT | |
8f9ca475 IM |
2167 | tristate "IA32 a.out support" |
2168 | depends on IA32_EMULATION | |
2169 | ---help--- | |
2170 | Support old a.out binaries in the 32bit emulation. | |
e279b6c1 | 2171 | |
0bf62763 | 2172 | config X86_X32 |
5fd92e65 L |
2173 | bool "x32 ABI for 64-bit mode (EXPERIMENTAL)" |
2174 | depends on X86_64 && IA32_EMULATION && EXPERIMENTAL | |
2175 | ---help--- | |
2176 | Include code to run binaries for the x32 native 32-bit ABI | |
2177 | for 64-bit processors. An x32 process gets access to the | |
2178 | full 64-bit register file and wide data path while leaving | |
2179 | pointers at 32 bits for smaller memory footprint. | |
2180 | ||
2181 | You will need a recent binutils (2.22 or later) with | |
2182 | elf32_x86_64 support enabled to compile a kernel with this | |
2183 | option set. | |
2184 | ||
e279b6c1 | 2185 | config COMPAT |
3c2362e6 | 2186 | def_bool y |
0bf62763 | 2187 | depends on IA32_EMULATION || X86_X32 |
48b25c43 | 2188 | select ARCH_WANT_OLD_COMPAT_IPC |
e279b6c1 SR |
2189 | |
2190 | config COMPAT_FOR_U64_ALIGNMENT | |
2191 | def_bool COMPAT | |
2192 | depends on X86_64 | |
2193 | ||
2194 | config SYSVIPC_COMPAT | |
3c2362e6 | 2195 | def_bool y |
b8992195 | 2196 | depends on COMPAT && SYSVIPC |
e279b6c1 | 2197 | |
ee009e4a DH |
2198 | config KEYS_COMPAT |
2199 | bool | |
2200 | depends on COMPAT && KEYS | |
2201 | default y | |
2202 | ||
e279b6c1 SR |
2203 | endmenu |
2204 | ||
2205 | ||
e5beae16 KP |
2206 | config HAVE_ATOMIC_IOMAP |
2207 | def_bool y | |
2208 | depends on X86_32 | |
2209 | ||
3cba11d3 MH |
2210 | config HAVE_TEXT_POKE_SMP |
2211 | bool | |
2212 | select STOP_MACHINE if SMP | |
2213 | ||
4692d77f AR |
2214 | config X86_DEV_DMA_OPS |
2215 | bool | |
83125a3a | 2216 | depends on X86_64 || STA2X11 |
4692d77f | 2217 | |
f7219a53 AR |
2218 | config X86_DMA_REMAP |
2219 | bool | |
83125a3a | 2220 | depends on STA2X11 |
f7219a53 | 2221 | |
e279b6c1 SR |
2222 | source "net/Kconfig" |
2223 | ||
2224 | source "drivers/Kconfig" | |
2225 | ||
2226 | source "drivers/firmware/Kconfig" | |
2227 | ||
2228 | source "fs/Kconfig" | |
2229 | ||
e279b6c1 SR |
2230 | source "arch/x86/Kconfig.debug" |
2231 | ||
2232 | source "security/Kconfig" | |
2233 | ||
2234 | source "crypto/Kconfig" | |
2235 | ||
edf88417 AK |
2236 | source "arch/x86/kvm/Kconfig" |
2237 | ||
e279b6c1 | 2238 | source "lib/Kconfig" |