Commit | Line | Data |
---|---|---|
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 | |
1032c0ba SR |
15 | |
16 | ### Arch settings | |
8d5fffb9 | 17 | config X86 |
3c2362e6 | 18 | def_bool y |
e17c6d56 | 19 | select HAVE_AOUT if X86_32 |
a5574cf6 | 20 | select HAVE_UNSTABLE_SCHED_CLOCK |
ec7748b5 | 21 | select HAVE_IDE |
42d4b839 | 22 | select HAVE_OPROFILE |
8761f1ab | 23 | select HAVE_PCSPKR_PLATFORM |
cc2067a5 | 24 | select HAVE_PERF_EVENTS |
e360adbe | 25 | select HAVE_IRQ_WORK |
28b2ee20 | 26 | select HAVE_IOREMAP_PROT |
3f550096 | 27 | select HAVE_KPROBES |
72d7c3b3 | 28 | select HAVE_MEMBLOCK |
0608f70c | 29 | select HAVE_MEMBLOCK_NODE_MAP |
c378ddd5 | 30 | select ARCH_DISCARD_MEMBLOCK |
1f972768 | 31 | select ARCH_WANT_OPTIONAL_GPIOLIB |
da4276b8 | 32 | select ARCH_WANT_FRAME_POINTERS |
7c095e46 | 33 | select HAVE_DMA_ATTRS |
9edddaa2 | 34 | select HAVE_KRETPROBES |
c0f7ac3a | 35 | select HAVE_OPTPROBES |
e4b2b886 | 36 | select HAVE_FTRACE_MCOUNT_RECORD |
cf4db259 | 37 | select HAVE_C_RECORDMCOUNT |
677aa9f7 | 38 | select HAVE_DYNAMIC_FTRACE |
606576ce | 39 | select HAVE_FUNCTION_TRACER |
48d68b20 | 40 | select HAVE_FUNCTION_GRAPH_TRACER |
71e308a2 | 41 | select HAVE_FUNCTION_GRAPH_FP_TEST |
60a7ecf4 | 42 | select HAVE_FUNCTION_TRACE_MCOUNT_TEST |
9a5fd902 | 43 | select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE |
66700001 | 44 | select HAVE_SYSCALL_TRACEPOINTS |
e0ec9483 | 45 | select HAVE_KVM |
49793b03 | 46 | select HAVE_ARCH_KGDB |
99bbc4b1 | 47 | select HAVE_ARCH_TRACEHOOK |
323ec001 | 48 | select HAVE_GENERIC_DMA_COHERENT if X86_32 |
58340a07 | 49 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
8d26487f | 50 | select USER_STACKTRACE_SUPPORT |
f850c30c | 51 | select HAVE_REGS_AND_STACK_ACCESS_API |
2118d0c5 | 52 | select HAVE_DMA_API_DEBUG |
2e9f3bdd PA |
53 | select HAVE_KERNEL_GZIP |
54 | select HAVE_KERNEL_BZIP2 | |
55 | select HAVE_KERNEL_LZMA | |
30314804 | 56 | select HAVE_KERNEL_XZ |
13510997 | 57 | select HAVE_KERNEL_LZO |
0067f129 | 58 | select HAVE_HW_BREAKPOINT |
0102752e | 59 | select HAVE_MIXED_BREAKPOINTS_REGS |
99e8c5a3 | 60 | select PERF_EVENTS |
c01d4323 | 61 | select HAVE_PERF_EVENTS_NMI |
99e8c5a3 | 62 | select ANON_INODES |
43570fd2 | 63 | select HAVE_ALIGNED_STRUCT_PAGE if SLUB && !M386 |
4156153c | 64 | select HAVE_CMPXCHG_LOCAL if !M386 |
2565409f | 65 | select HAVE_CMPXCHG_DOUBLE |
0a4af3b0 | 66 | select HAVE_ARCH_KMEMCHECK |
7c68af6e | 67 | select HAVE_USER_RETURN_NOTIFIER |
e39f5602 | 68 | select ARCH_BINFMT_ELF_RANDOMIZE_PIE |
46eb3b64 | 69 | select HAVE_ARCH_JUMP_LABEL |
3cba11d3 | 70 | select HAVE_TEXT_POKE_SMP |
3bb9808e TG |
71 | select HAVE_GENERIC_HARDIRQS |
72 | select HAVE_SPARSE_IRQ | |
141d55e6 | 73 | select SPARSE_IRQ |
c49aa5bd | 74 | select GENERIC_FIND_FIRST_BIT |
3bb9808e TG |
75 | select GENERIC_IRQ_PROBE |
76 | select GENERIC_PENDING_IRQ if SMP | |
517e4981 | 77 | select GENERIC_IRQ_SHOW |
d1748302 | 78 | select GENERIC_CLOCKEVENTS_MIN_ADJUST |
c0185808 | 79 | select IRQ_FORCED_THREADING |
351f8f8e | 80 | select USE_GENERIC_SMP_HELPERS if SMP |
9cddf15f | 81 | select HAVE_BPF_JIT if (X86_64 && NET) |
0a779c57 | 82 | select CLKEVT_I8253 |
df013ffb | 83 | select ARCH_HAVE_NMI_SAFE_CMPXCHG |
4673ca8e | 84 | select GENERIC_IOMAP |
7d8330a5 | 85 | |
ba7e4d13 IM |
86 | config INSTRUCTION_DECODER |
87 | def_bool (KPROBES || PERF_EVENTS) | |
88 | ||
51b26ada LT |
89 | config OUTPUT_FORMAT |
90 | string | |
91 | default "elf32-i386" if X86_32 | |
92 | default "elf64-x86-64" if X86_64 | |
93 | ||
73531905 | 94 | config ARCH_DEFCONFIG |
b9b39bfb | 95 | string |
73531905 SR |
96 | default "arch/x86/configs/i386_defconfig" if X86_32 |
97 | default "arch/x86/configs/x86_64_defconfig" if X86_64 | |
b9b39bfb | 98 | |
8d5fffb9 | 99 | config GENERIC_CMOS_UPDATE |
3c2362e6 | 100 | def_bool y |
8d5fffb9 SR |
101 | |
102 | config CLOCKSOURCE_WATCHDOG | |
3c2362e6 | 103 | def_bool y |
8d5fffb9 SR |
104 | |
105 | config GENERIC_CLOCKEVENTS | |
3c2362e6 | 106 | def_bool y |
8d5fffb9 | 107 | |
ae7bd11b PA |
108 | config ARCH_CLOCKSOURCE_DATA |
109 | def_bool y | |
110 | depends on X86_64 | |
111 | ||
8d5fffb9 | 112 | config GENERIC_CLOCKEVENTS_BROADCAST |
3c2362e6 | 113 | def_bool y |
8d5fffb9 SR |
114 | depends on X86_64 || (X86_32 && X86_LOCAL_APIC) |
115 | ||
116 | config LOCKDEP_SUPPORT | |
3c2362e6 | 117 | def_bool y |
8d5fffb9 SR |
118 | |
119 | config STACKTRACE_SUPPORT | |
3c2362e6 | 120 | def_bool y |
8d5fffb9 | 121 | |
aa7d9350 HC |
122 | config HAVE_LATENCYTOP_SUPPORT |
123 | def_bool y | |
124 | ||
8d5fffb9 | 125 | config MMU |
3c2362e6 | 126 | def_bool y |
8d5fffb9 | 127 | |
8d5fffb9 SR |
128 | config SBUS |
129 | bool | |
130 | ||
3bc4e459 | 131 | config NEED_DMA_MAP_STATE |
d3f13810 | 132 | def_bool (X86_64 || INTEL_IOMMU || DMA_API_DEBUG) |
3bc4e459 | 133 | |
18e98307 | 134 | config NEED_SG_DMA_LENGTH |
4a14d84e | 135 | def_bool y |
18e98307 | 136 | |
8d5fffb9 | 137 | config GENERIC_ISA_DMA |
1c00f016 | 138 | def_bool ISA_DMA_API |
8d5fffb9 | 139 | |
8d5fffb9 | 140 | config GENERIC_BUG |
3c2362e6 | 141 | def_bool y |
8d5fffb9 | 142 | depends on BUG |
b93a531e JB |
143 | select GENERIC_BUG_RELATIVE_POINTERS if X86_64 |
144 | ||
145 | config GENERIC_BUG_RELATIVE_POINTERS | |
146 | bool | |
8d5fffb9 SR |
147 | |
148 | config GENERIC_HWEIGHT | |
3c2362e6 | 149 | def_bool y |
8d5fffb9 | 150 | |
a6082959 | 151 | config GENERIC_GPIO |
9ba16087 | 152 | bool |
a6082959 | 153 | |
8d5fffb9 | 154 | config ARCH_MAY_HAVE_PC_FDC |
8df3bd9e | 155 | def_bool ISA_DMA_API |
8d5fffb9 | 156 | |
1032c0ba SR |
157 | config RWSEM_GENERIC_SPINLOCK |
158 | def_bool !X86_XADD | |
159 | ||
160 | config RWSEM_XCHGADD_ALGORITHM | |
161 | def_bool X86_XADD | |
162 | ||
a6869cc4 VP |
163 | config ARCH_HAS_CPU_IDLE_WAIT |
164 | def_bool y | |
165 | ||
1032c0ba SR |
166 | config GENERIC_CALIBRATE_DELAY |
167 | def_bool y | |
168 | ||
8d5fffb9 SR |
169 | config GENERIC_TIME_VSYSCALL |
170 | bool | |
171 | default X86_64 | |
172 | ||
9a0b8415 | 173 | config ARCH_HAS_CPU_RELAX |
174 | def_bool y | |
175 | ||
89cedfef VP |
176 | config ARCH_HAS_DEFAULT_IDLE |
177 | def_bool y | |
178 | ||
1b27d05b PE |
179 | config ARCH_HAS_CACHE_LINE_SIZE |
180 | def_bool y | |
181 | ||
dd5af90a | 182 | config HAVE_SETUP_PER_CPU_AREA |
89c9c4c5 | 183 | def_bool y |
b32ef636 | 184 | |
08fc4580 TH |
185 | config NEED_PER_CPU_EMBED_FIRST_CHUNK |
186 | def_bool y | |
187 | ||
188 | config NEED_PER_CPU_PAGE_FIRST_CHUNK | |
11124411 TH |
189 | def_bool y |
190 | ||
801e4062 JB |
191 | config ARCH_HIBERNATION_POSSIBLE |
192 | def_bool y | |
801e4062 | 193 | |
f4cb5700 JB |
194 | config ARCH_SUSPEND_POSSIBLE |
195 | def_bool y | |
f4cb5700 | 196 | |
8d5fffb9 SR |
197 | config ZONE_DMA32 |
198 | bool | |
199 | default X86_64 | |
200 | ||
8d5fffb9 SR |
201 | config AUDIT_ARCH |
202 | bool | |
203 | default X86_64 | |
204 | ||
765c68bd IM |
205 | config ARCH_SUPPORTS_OPTIMIZED_INLINING |
206 | def_bool y | |
207 | ||
6a11f75b AM |
208 | config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
209 | def_bool y | |
210 | ||
69575d38 SW |
211 | config HAVE_INTEL_TXT |
212 | def_bool y | |
d3f13810 | 213 | depends on EXPERIMENTAL && INTEL_IOMMU && ACPI |
69575d38 | 214 | |
6b0c3d44 SR |
215 | config X86_32_SMP |
216 | def_bool y | |
217 | depends on X86_32 && SMP | |
218 | ||
219 | config X86_64_SMP | |
220 | def_bool y | |
221 | depends on X86_64 && SMP | |
222 | ||
8d5fffb9 | 223 | config X86_HT |
6fc108a0 | 224 | def_bool y |
ee0011a7 | 225 | depends on SMP |
8d5fffb9 | 226 | |
ccbeed3a TH |
227 | config X86_32_LAZY_GS |
228 | def_bool y | |
60a5317f | 229 | depends on X86_32 && !CC_STACKPROTECTOR |
ccbeed3a | 230 | |
d61931d8 BP |
231 | config ARCH_HWEIGHT_CFLAGS |
232 | string | |
233 | default "-fcall-saved-ecx -fcall-saved-edx" if X86_32 | |
234 | 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 | |
235 | ||
8d5fffb9 SR |
236 | config KTIME_SCALAR |
237 | def_bool X86_32 | |
d7c53c9e BP |
238 | |
239 | config ARCH_CPU_PROBE_RELEASE | |
240 | def_bool y | |
241 | depends on HOTPLUG_CPU | |
242 | ||
506f1d07 | 243 | source "init/Kconfig" |
dc52ddc0 | 244 | source "kernel/Kconfig.freezer" |
8d5fffb9 | 245 | |
506f1d07 SR |
246 | menu "Processor type and features" |
247 | ||
5ee71535 RD |
248 | config ZONE_DMA |
249 | bool "DMA memory allocation support" if EXPERT | |
250 | default y | |
251 | help | |
252 | DMA memory allocation support allows devices with less than 32-bit | |
253 | addressing to allocate within the first 16MB of address space. | |
254 | Disable if no such devices will be used. | |
255 | ||
256 | If unsure, say Y. | |
257 | ||
506f1d07 SR |
258 | source "kernel/time/Kconfig" |
259 | ||
260 | config SMP | |
261 | bool "Symmetric multi-processing support" | |
262 | ---help--- | |
263 | This enables support for systems with more than one CPU. If you have | |
264 | a system with only one CPU, like most personal computers, say N. If | |
265 | you have a system with more than one CPU, say Y. | |
266 | ||
267 | If you say N here, the kernel will run on single and multiprocessor | |
268 | machines, but will use only one CPU of a multiprocessor machine. If | |
269 | you say Y here, the kernel will run on many, but not all, | |
270 | singleprocessor machines. On a singleprocessor machine, the kernel | |
271 | will run faster if you say N here. | |
272 | ||
273 | Note that if you say Y here and choose architecture "586" or | |
274 | "Pentium" under "Processor family", the kernel will not work on 486 | |
275 | architectures. Similarly, multiprocessor kernels for the "PPro" | |
276 | architecture may not work on all Pentium based boards. | |
277 | ||
278 | People using multiprocessor machines who say Y here should also say | |
279 | Y to "Enhanced Real Time Clock Support", below. The "Advanced Power | |
280 | Management" code will be disabled if you say Y here. | |
281 | ||
395cf969 | 282 | See also <file:Documentation/x86/i386/IO-APIC.txt>, |
506f1d07 SR |
283 | <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at |
284 | <http://www.tldp.org/docs.html#howto>. | |
285 | ||
286 | If you don't know what to do here, say N. | |
287 | ||
06cd9a7d YL |
288 | config X86_X2APIC |
289 | bool "Support x2apic" | |
d3f13810 | 290 | depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP |
06cd9a7d YL |
291 | ---help--- |
292 | This enables x2apic support on CPUs that have this feature. | |
293 | ||
294 | This allows 32-bit apic IDs (so it can support very large systems), | |
295 | and accesses the local apic via MSRs not via mmio. | |
296 | ||
06cd9a7d YL |
297 | If you don't know what to do here, say N. |
298 | ||
6695c85b | 299 | config X86_MPPARSE |
7a527688 JB |
300 | bool "Enable MPS table" if ACPI |
301 | default y | |
5ab74722 | 302 | depends on X86_LOCAL_APIC |
8f9ca475 | 303 | ---help--- |
6695c85b YL |
304 | For old smp systems that do not have proper acpi support. Newer systems |
305 | (esp with 64bit cpus) with acpi support, MADT and DSDT will override it | |
6695c85b | 306 | |
26f7ef14 YL |
307 | config X86_BIGSMP |
308 | bool "Support for big SMP systems with more than 8 CPUs" | |
309 | depends on X86_32 && SMP | |
8f9ca475 | 310 | ---help--- |
26f7ef14 | 311 | This option is needed for the systems that have more than 8 CPUs |
506f1d07 | 312 | |
8425091f | 313 | if X86_32 |
c5c606d9 RT |
314 | config X86_EXTENDED_PLATFORM |
315 | bool "Support for extended (non-PC) x86 platforms" | |
316 | default y | |
8f9ca475 | 317 | ---help--- |
06ac8346 IM |
318 | If you disable this option then the kernel will only support |
319 | standard PC platforms. (which covers the vast majority of | |
320 | systems out there.) | |
321 | ||
8425091f RT |
322 | If you enable this option then you'll be able to select support |
323 | for the following (non-PC) 32 bit x86 platforms: | |
324 | AMD Elan | |
325 | NUMAQ (IBM/Sequent) | |
326 | RDC R-321x SoC | |
327 | SGI 320/540 (Visual Workstation) | |
328 | Summit/EXA (IBM x440) | |
329 | Unisys ES7000 IA32 series | |
3f4110a4 | 330 | Moorestown MID devices |
06ac8346 IM |
331 | |
332 | If you have one of these systems, or if you want to build a | |
333 | generic distribution kernel, say Y here - otherwise say N. | |
8425091f | 334 | endif |
06ac8346 | 335 | |
8425091f RT |
336 | if X86_64 |
337 | config X86_EXTENDED_PLATFORM | |
338 | bool "Support for extended (non-PC) x86 platforms" | |
339 | default y | |
340 | ---help--- | |
341 | If you disable this option then the kernel will only support | |
342 | standard PC platforms. (which covers the vast majority of | |
343 | systems out there.) | |
344 | ||
345 | If you enable this option then you'll be able to select support | |
346 | for the following (non-PC) 64 bit x86 platforms: | |
44b111b5 | 347 | Numascale NumaChip |
8425091f RT |
348 | ScaleMP vSMP |
349 | SGI Ultraviolet | |
350 | ||
351 | If you have one of these systems, or if you want to build a | |
352 | generic distribution kernel, say Y here - otherwise say N. | |
353 | endif | |
c5c606d9 RT |
354 | # This is an alphabetically sorted list of 64 bit extended platforms |
355 | # Please maintain the alphabetic order if and when there are additions | |
44b111b5 SP |
356 | config X86_NUMACHIP |
357 | bool "Numascale NumaChip" | |
358 | depends on X86_64 | |
359 | depends on X86_EXTENDED_PLATFORM | |
360 | depends on NUMA | |
361 | depends on SMP | |
362 | depends on X86_X2APIC | |
44b111b5 SP |
363 | ---help--- |
364 | Adds support for Numascale NumaChip large-SMP systems. Needed to | |
365 | enable more than ~168 cores. | |
366 | If you don't have one of these, you should say N here. | |
506f1d07 | 367 | |
c5c606d9 RT |
368 | config X86_VSMP |
369 | bool "ScaleMP vSMP" | |
03f1a17c | 370 | select PARAVIRT_GUEST |
c5c606d9 RT |
371 | select PARAVIRT |
372 | depends on X86_64 && PCI | |
373 | depends on X86_EXTENDED_PLATFORM | |
8f9ca475 | 374 | ---help--- |
c5c606d9 RT |
375 | Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is |
376 | supposed to run on these EM64T-based machines. Only choose this option | |
377 | if you have one of these machines. | |
5e3a77e9 | 378 | |
03b48632 NP |
379 | config X86_UV |
380 | bool "SGI Ultraviolet" | |
381 | depends on X86_64 | |
c5c606d9 | 382 | depends on X86_EXTENDED_PLATFORM |
54c28d29 | 383 | depends on NUMA |
9d6c26e7 | 384 | depends on X86_X2APIC |
8f9ca475 | 385 | ---help--- |
03b48632 NP |
386 | This option is needed in order to support SGI Ultraviolet systems. |
387 | If you don't have one of these, you should say N here. | |
388 | ||
c5c606d9 RT |
389 | # Following is an alphabetically sorted list of 32 bit extended platforms |
390 | # Please maintain the alphabetic order if and when there are additions | |
506f1d07 | 391 | |
c751e17b TG |
392 | config X86_INTEL_CE |
393 | bool "CE4100 TV platform" | |
394 | depends on PCI | |
395 | depends on PCI_GODIRECT | |
396 | depends on X86_32 | |
397 | depends on X86_EXTENDED_PLATFORM | |
37bc9f50 | 398 | select X86_REBOOTFIXUPS |
da6b737b SAS |
399 | select OF |
400 | select OF_EARLY_FLATTREE | |
c751e17b TG |
401 | ---help--- |
402 | Select for the Intel CE media processor (CE4100) SOC. | |
403 | This option compiles in support for the CE4100 SOC for settop | |
404 | boxes and media devices. | |
405 | ||
dd137525 | 406 | config X86_WANT_INTEL_MID |
43605ef1 AC |
407 | bool "Intel MID platform support" |
408 | depends on X86_32 | |
409 | depends on X86_EXTENDED_PLATFORM | |
410 | ---help--- | |
411 | Select to build a kernel capable of supporting Intel MID platform | |
412 | systems which do not have the PCI legacy interfaces (Moorestown, | |
413 | Medfield). If you are building for a PC class system say N here. | |
414 | ||
dd137525 | 415 | if X86_WANT_INTEL_MID |
43605ef1 | 416 | |
4e2b1c4f AC |
417 | config X86_INTEL_MID |
418 | bool | |
419 | ||
3f4110a4 TG |
420 | config X86_MRST |
421 | bool "Moorestown MID platform" | |
4b2f3f7d JP |
422 | depends on PCI |
423 | depends on PCI_GOANY | |
4b2f3f7d | 424 | depends on X86_IO_APIC |
7c9c3a1e AC |
425 | select X86_INTEL_MID |
426 | select SFI | |
427 | select DW_APB_TIMER | |
bb24c471 | 428 | select APB_TIMER |
1da4b1c6 FT |
429 | select I2C |
430 | select SPI | |
b9fc71f4 | 431 | select INTEL_SCU_IPC |
ad02519a | 432 | select X86_PLATFORM_DEVICES |
3f4110a4 TG |
433 | ---help--- |
434 | Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin | |
435 | Internet Device(MID) platform. Moorestown consists of two chips: | |
436 | Lincroft (CPU core, graphics, and memory controller) and Langwell IOH. | |
437 | Unlike standard x86 PCs, Moorestown does not have many legacy devices | |
438 | nor standard legacy replacement devices/features. e.g. Moorestown does | |
439 | not contain i8259, i8254, HPET, legacy BIOS, most of the io ports. | |
440 | ||
1ea7c673 AC |
441 | config X86_MDFLD |
442 | bool "Medfield MID platform" | |
443 | depends on PCI | |
444 | depends on PCI_GOANY | |
445 | depends on X86_IO_APIC | |
7c9c3a1e AC |
446 | select X86_INTEL_MID |
447 | select SFI | |
448 | select DW_APB_TIMER | |
1ea7c673 AC |
449 | select APB_TIMER |
450 | select I2C | |
451 | select SPI | |
452 | select INTEL_SCU_IPC | |
453 | select X86_PLATFORM_DEVICES | |
454 | ---help--- | |
455 | Medfield is Intel's Low Power Intel Architecture (LPIA) based Moblin | |
456 | Internet Device(MID) platform. | |
457 | Unlike standard x86 PCs, Medfield does not have many legacy devices | |
458 | nor standard legacy replacement devices/features. e.g. Medfield does | |
459 | not contain i8259, i8254, HPET, legacy BIOS, most of the io ports. | |
460 | ||
43605ef1 AC |
461 | endif |
462 | ||
c5c606d9 RT |
463 | config X86_RDC321X |
464 | bool "RDC R-321x SoC" | |
506f1d07 | 465 | depends on X86_32 |
c5c606d9 RT |
466 | depends on X86_EXTENDED_PLATFORM |
467 | select M486 | |
468 | select X86_REBOOTFIXUPS | |
469 | ---help--- | |
470 | This option is needed for RDC R-321x system-on-chip, also known | |
471 | as R-8610-(G). | |
472 | If you don't have one of these chips, you should say N here. | |
473 | ||
e0c7ae37 | 474 | config X86_32_NON_STANDARD |
9c398017 IM |
475 | bool "Support non-standard 32-bit SMP architectures" |
476 | depends on X86_32 && SMP | |
c5c606d9 | 477 | depends on X86_EXTENDED_PLATFORM |
8f9ca475 IM |
478 | ---help--- |
479 | This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default | |
d49c4288 YL |
480 | subarchitectures. It is intended for a generic binary kernel. |
481 | if you select them all, kernel will probe it one by one. and will | |
482 | fallback to default. | |
483 | ||
c5c606d9 | 484 | # Alphabetically sorted list of Non standard 32 bit platforms |
d49c4288 | 485 | |
506f1d07 SR |
486 | config X86_NUMAQ |
487 | bool "NUMAQ (IBM/Sequent)" | |
e0c7ae37 | 488 | depends on X86_32_NON_STANDARD |
a92d152e | 489 | depends on PCI |
506f1d07 | 490 | select NUMA |
9c398017 | 491 | select X86_MPPARSE |
8f9ca475 | 492 | ---help--- |
d49c4288 YL |
493 | This option is used for getting Linux to run on a NUMAQ (IBM/Sequent) |
494 | NUMA multiquad box. This changes the way that processors are | |
495 | bootstrapped, and uses Clustered Logical APIC addressing mode instead | |
496 | of Flat Logical. You will need a new lynxer.elf file to flash your | |
497 | firmware with - send email to <Martin.Bligh@us.ibm.com>. | |
506f1d07 | 498 | |
d949f36f | 499 | config X86_SUPPORTS_MEMORY_FAILURE |
6fc108a0 | 500 | def_bool y |
d949f36f LT |
501 | # MCE code calls memory_failure(): |
502 | depends on X86_MCE | |
503 | # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags: | |
504 | depends on !X86_NUMAQ | |
505 | # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH: | |
506 | depends on X86_64 || !SPARSEMEM | |
507 | select ARCH_SUPPORTS_MEMORY_FAILURE | |
d949f36f | 508 | |
1b84e1c8 IM |
509 | config X86_VISWS |
510 | bool "SGI 320/540 (Visual Workstation)" | |
c5c606d9 RT |
511 | depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT |
512 | depends on X86_32_NON_STANDARD | |
513 | ---help--- | |
1b84e1c8 IM |
514 | The SGI Visual Workstation series is an IA32-based workstation |
515 | based on SGI systems chips with some legacy PC hardware attached. | |
516 | ||
517 | Say Y here to create a kernel to run on the SGI 320 or 540. | |
518 | ||
519 | A kernel compiled for the Visual Workstation will run on general | |
520 | PCs as well. See <file:Documentation/sgi-visws.txt> for details. | |
521 | ||
9c398017 IM |
522 | config X86_SUMMIT |
523 | bool "Summit/EXA (IBM x440)" | |
e0c7ae37 | 524 | depends on X86_32_NON_STANDARD |
8f9ca475 | 525 | ---help--- |
9c398017 IM |
526 | This option is needed for IBM systems that use the Summit/EXA chipset. |
527 | In particular, it is needed for the x440. | |
1f972768 | 528 | |
9c398017 | 529 | config X86_ES7000 |
c5c606d9 | 530 | bool "Unisys ES7000 IA32 series" |
26f7ef14 | 531 | depends on X86_32_NON_STANDARD && X86_BIGSMP |
8f9ca475 | 532 | ---help--- |
9c398017 IM |
533 | Support for Unisys ES7000 systems. Say 'Y' here if this kernel is |
534 | supposed to run on an IA32-based Unisys ES7000 system. | |
535 | ||
82148d1d S |
536 | config X86_32_IRIS |
537 | tristate "Eurobraille/Iris poweroff module" | |
538 | depends on X86_32 | |
539 | ---help--- | |
540 | The Iris machines from EuroBraille do not have APM or ACPI support | |
541 | to shut themselves down properly. A special I/O sequence is | |
542 | needed to do so, which is what this module does at | |
543 | kernel shutdown. | |
544 | ||
545 | This is only for Iris machines from EuroBraille. | |
546 | ||
547 | If unused, say N. | |
548 | ||
ae1e9130 | 549 | config SCHED_OMIT_FRAME_POINTER |
3c2362e6 HH |
550 | def_bool y |
551 | prompt "Single-depth WCHAN output" | |
a87d0914 | 552 | depends on X86 |
8f9ca475 | 553 | ---help--- |
506f1d07 SR |
554 | Calculate simpler /proc/<PID>/wchan values. If this option |
555 | is disabled then wchan values will recurse back to the | |
556 | caller function. This provides more accurate wchan values, | |
557 | at the expense of slightly more scheduling overhead. | |
558 | ||
559 | If in doubt, say "Y". | |
560 | ||
506f1d07 SR |
561 | menuconfig PARAVIRT_GUEST |
562 | bool "Paravirtualized guest support" | |
8f9ca475 | 563 | ---help--- |
506f1d07 SR |
564 | Say Y here to get to see options related to running Linux under |
565 | various hypervisors. This option alone does not add any kernel code. | |
566 | ||
567 | If you say N, all options in this submenu will be skipped and disabled. | |
568 | ||
569 | if PARAVIRT_GUEST | |
570 | ||
095c0aa8 GC |
571 | config PARAVIRT_TIME_ACCOUNTING |
572 | bool "Paravirtual steal time accounting" | |
573 | select PARAVIRT | |
574 | default n | |
575 | ---help--- | |
576 | Select this option to enable fine granularity task steal time | |
577 | accounting. Time spent executing other tasks in parallel with | |
578 | the current vCPU is discounted from the vCPU power. To account for | |
579 | that, there can be a small performance impact. | |
580 | ||
581 | If in doubt, say N here. | |
582 | ||
506f1d07 SR |
583 | source "arch/x86/xen/Kconfig" |
584 | ||
790c73f6 GOC |
585 | config KVM_CLOCK |
586 | bool "KVM paravirtualized clock" | |
587 | select PARAVIRT | |
f6e16d5a | 588 | select PARAVIRT_CLOCK |
8f9ca475 | 589 | ---help--- |
790c73f6 GOC |
590 | Turning on this option will allow you to run a paravirtualized clock |
591 | when running over the KVM hypervisor. Instead of relying on a PIT | |
592 | (or probably other) emulation by the underlying device model, the host | |
593 | provides the guest with timing infrastructure such as time of day, and | |
594 | system time | |
595 | ||
0cf1bfd2 MT |
596 | config KVM_GUEST |
597 | bool "KVM Guest support" | |
598 | select PARAVIRT | |
8f9ca475 IM |
599 | ---help--- |
600 | This option enables various optimizations for running under the KVM | |
601 | hypervisor. | |
0cf1bfd2 | 602 | |
506f1d07 SR |
603 | source "arch/x86/lguest/Kconfig" |
604 | ||
e61bd94a EPH |
605 | config PARAVIRT |
606 | bool "Enable paravirtualization code" | |
8f9ca475 | 607 | ---help--- |
e61bd94a EPH |
608 | This changes the kernel so it can modify itself when it is run |
609 | under a hypervisor, potentially improving performance significantly | |
610 | over full virtualization. However, when run without a hypervisor | |
611 | the kernel is theoretically slower and slightly larger. | |
612 | ||
b4ecc126 JF |
613 | config PARAVIRT_SPINLOCKS |
614 | bool "Paravirtualization layer for spinlocks" | |
615 | depends on PARAVIRT && SMP && EXPERIMENTAL | |
616 | ---help--- | |
617 | Paravirtualized spinlocks allow a pvops backend to replace the | |
618 | spinlock implementation with something virtualization-friendly | |
619 | (for example, block the virtual CPU rather than spinning). | |
620 | ||
621 | Unfortunately the downside is an up to 5% performance hit on | |
622 | native kernels, with various workloads. | |
623 | ||
624 | If you are unsure how to answer this question, answer N. | |
625 | ||
7af192c9 GH |
626 | config PARAVIRT_CLOCK |
627 | bool | |
7af192c9 | 628 | |
506f1d07 SR |
629 | endif |
630 | ||
97349135 | 631 | config PARAVIRT_DEBUG |
8f9ca475 IM |
632 | bool "paravirt-ops debugging" |
633 | depends on PARAVIRT && DEBUG_KERNEL | |
634 | ---help--- | |
635 | Enable to debug paravirt_ops internals. Specifically, BUG if | |
636 | a paravirt_op is missing when it is called. | |
97349135 | 637 | |
08677214 | 638 | config NO_BOOTMEM |
774ea0bc | 639 | def_bool y |
08677214 | 640 | |
03273184 YL |
641 | config MEMTEST |
642 | bool "Memtest" | |
8f9ca475 | 643 | ---help--- |
c64df707 | 644 | This option adds a kernel parameter 'memtest', which allows memtest |
03273184 | 645 | to be set. |
8f9ca475 IM |
646 | memtest=0, mean disabled; -- default |
647 | memtest=1, mean do 1 test pattern; | |
648 | ... | |
649 | memtest=4, mean do 4 test patterns. | |
aba3728c | 650 | If you are unsure how to answer this question, answer N. |
506f1d07 SR |
651 | |
652 | config X86_SUMMIT_NUMA | |
3c2362e6 | 653 | def_bool y |
e0c7ae37 | 654 | depends on X86_32 && NUMA && X86_32_NON_STANDARD |
506f1d07 SR |
655 | |
656 | config X86_CYCLONE_TIMER | |
3c2362e6 | 657 | def_bool y |
f9b15df4 | 658 | depends on X86_SUMMIT |
506f1d07 | 659 | |
506f1d07 SR |
660 | source "arch/x86/Kconfig.cpu" |
661 | ||
662 | config HPET_TIMER | |
3c2362e6 | 663 | def_bool X86_64 |
506f1d07 | 664 | prompt "HPET Timer Support" if X86_32 |
8f9ca475 IM |
665 | ---help--- |
666 | Use the IA-PC HPET (High Precision Event Timer) to manage | |
667 | time in preference to the PIT and RTC, if a HPET is | |
668 | present. | |
669 | HPET is the next generation timer replacing legacy 8254s. | |
670 | The HPET provides a stable time base on SMP | |
671 | systems, unlike the TSC, but it is more expensive to access, | |
672 | as it is off-chip. You can find the HPET spec at | |
673 | <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>. | |
506f1d07 | 674 | |
8f9ca475 IM |
675 | You can safely choose Y here. However, HPET will only be |
676 | activated if the platform and the BIOS support this feature. | |
677 | Otherwise the 8254 will be used for timing services. | |
506f1d07 | 678 | |
8f9ca475 | 679 | Choose N to continue using the legacy 8254 timer. |
506f1d07 SR |
680 | |
681 | config HPET_EMULATE_RTC | |
3c2362e6 | 682 | def_bool y |
9d8af78b | 683 | depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) |
506f1d07 | 684 | |
bb24c471 | 685 | config APB_TIMER |
933b9463 AC |
686 | def_bool y if X86_INTEL_MID |
687 | prompt "Intel MID APB Timer Support" if X86_INTEL_MID | |
06c3df49 | 688 | select DW_APB_TIMER |
a0c3832a | 689 | depends on X86_INTEL_MID && SFI |
bb24c471 JP |
690 | help |
691 | APB timer is the replacement for 8254, HPET on X86 MID platforms. | |
692 | The APBT provides a stable time base on SMP | |
693 | systems, unlike the TSC, but it is more expensive to access, | |
694 | as it is off-chip. APB timers are always running regardless of CPU | |
695 | C states, they are used as per CPU clockevent device when possible. | |
696 | ||
6a108a14 | 697 | # Mark as expert because too many people got it wrong. |
506f1d07 | 698 | # The code disables itself when not needed. |
7ae9392c TP |
699 | config DMI |
700 | default y | |
6a108a14 | 701 | bool "Enable DMI scanning" if EXPERT |
8f9ca475 | 702 | ---help--- |
7ae9392c TP |
703 | Enabled scanning of DMI to identify machine quirks. Say Y |
704 | here unless you have verified that your setup is not | |
705 | affected by entries in the DMI blacklist. Required by PNP | |
706 | BIOS code. | |
707 | ||
506f1d07 | 708 | config GART_IOMMU |
6a108a14 | 709 | bool "GART IOMMU support" if EXPERT |
506f1d07 SR |
710 | default y |
711 | select SWIOTLB | |
23ac4ae8 | 712 | depends on X86_64 && PCI && AMD_NB |
8f9ca475 | 713 | ---help--- |
506f1d07 SR |
714 | Support for full DMA access of devices with 32bit memory access only |
715 | on systems with more than 3GB. This is usually needed for USB, | |
716 | sound, many IDE/SATA chipsets and some other devices. | |
717 | Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART | |
718 | based hardware IOMMU and a software bounce buffer based IOMMU used | |
719 | on Intel systems and as fallback. | |
720 | The code is only active when needed (enough memory and limited | |
721 | device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified | |
722 | too. | |
723 | ||
724 | config CALGARY_IOMMU | |
725 | bool "IBM Calgary IOMMU support" | |
726 | select SWIOTLB | |
727 | depends on X86_64 && PCI && EXPERIMENTAL | |
8f9ca475 | 728 | ---help--- |
506f1d07 SR |
729 | Support for hardware IOMMUs in IBM's xSeries x366 and x460 |
730 | systems. Needed to run systems with more than 3GB of memory | |
731 | properly with 32-bit PCI devices that do not support DAC | |
732 | (Double Address Cycle). Calgary also supports bus level | |
733 | isolation, where all DMAs pass through the IOMMU. This | |
734 | prevents them from going anywhere except their intended | |
735 | destination. This catches hard-to-find kernel bugs and | |
736 | mis-behaving drivers and devices that do not use the DMA-API | |
737 | properly to set up their DMA buffers. The IOMMU can be | |
738 | turned off at boot time with the iommu=off parameter. | |
739 | Normally the kernel will make the right choice by itself. | |
740 | If unsure, say Y. | |
741 | ||
742 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT | |
3c2362e6 HH |
743 | def_bool y |
744 | prompt "Should Calgary be enabled by default?" | |
506f1d07 | 745 | depends on CALGARY_IOMMU |
8f9ca475 | 746 | ---help--- |
506f1d07 SR |
747 | Should Calgary be enabled by default? if you choose 'y', Calgary |
748 | will be used (if it exists). If you choose 'n', Calgary will not be | |
749 | used even if it exists. If you choose 'n' and would like to use | |
750 | Calgary anyway, pass 'iommu=calgary' on the kernel command line. | |
751 | If unsure, say Y. | |
752 | ||
753 | # need this always selected by IOMMU for the VIA workaround | |
754 | config SWIOTLB | |
a1afd01c | 755 | def_bool y if X86_64 |
8f9ca475 | 756 | ---help--- |
506f1d07 SR |
757 | Support for software bounce buffers used on x86-64 systems |
758 | which don't have a hardware IOMMU (e.g. the current generation | |
759 | of Intel's x86-64 CPUs). Using this PCI devices which can only | |
760 | access 32-bits of memory can be used on systems with more than | |
761 | 3 GB of memory. If unsure, say Y. | |
762 | ||
a8522509 | 763 | config IOMMU_HELPER |
18b743dc | 764 | def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU) |
d25e26b6 | 765 | |
1184dc2f | 766 | config MAXSMP |
ddb0c5a6 | 767 | bool "Enable Maximum number of SMP Processors and NUMA Nodes" |
36f5101a MT |
768 | depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL |
769 | select CPUMASK_OFFSTACK | |
8f9ca475 | 770 | ---help--- |
ddb0c5a6 | 771 | Enable maximum number of CPUS and NUMA Nodes for this architecture. |
1184dc2f | 772 | If unsure, say N. |
506f1d07 SR |
773 | |
774 | config NR_CPUS | |
36f5101a | 775 | int "Maximum number of CPUs" if SMP && !MAXSMP |
2a3313f4 | 776 | range 2 8 if SMP && X86_32 && !X86_BIGSMP |
36f5101a | 777 | range 2 512 if SMP && !MAXSMP |
78637a97 | 778 | default "1" if !SMP |
d25e26b6 | 779 | default "4096" if MAXSMP |
78637a97 MT |
780 | default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000) |
781 | default "8" if SMP | |
8f9ca475 | 782 | ---help--- |
506f1d07 | 783 | This allows you to specify the maximum number of CPUs which this |
d25e26b6 | 784 | kernel will support. The maximum supported value is 512 and the |
506f1d07 SR |
785 | minimum value which makes sense is 2. |
786 | ||
787 | This is purely to save memory - each supported CPU adds | |
788 | approximately eight kilobytes to the kernel image. | |
789 | ||
790 | config SCHED_SMT | |
791 | bool "SMT (Hyperthreading) scheduler support" | |
b089c12b | 792 | depends on X86_HT |
8f9ca475 | 793 | ---help--- |
506f1d07 SR |
794 | SMT scheduler support improves the CPU scheduler's decision making |
795 | when dealing with Intel Pentium 4 chips with HyperThreading at a | |
796 | cost of slightly increased overhead in some places. If unsure say | |
797 | N here. | |
798 | ||
799 | config SCHED_MC | |
3c2362e6 HH |
800 | def_bool y |
801 | prompt "Multi-core scheduler support" | |
b089c12b | 802 | depends on X86_HT |
8f9ca475 | 803 | ---help--- |
506f1d07 SR |
804 | Multi-core scheduler support improves the CPU scheduler's decision |
805 | making when dealing with multi-core CPU chips at a cost of slightly | |
806 | increased overhead in some places. If unsure say N here. | |
807 | ||
e82b8e4e VP |
808 | config IRQ_TIME_ACCOUNTING |
809 | bool "Fine granularity task level IRQ time accounting" | |
810 | default n | |
811 | ---help--- | |
812 | Select this option to enable fine granularity task irq time | |
813 | accounting. This is done by reading a timestamp on each | |
814 | transitions between softirq and hardirq state, so there can be a | |
815 | small performance impact. | |
816 | ||
817 | If in doubt, say N here. | |
818 | ||
506f1d07 SR |
819 | source "kernel/Kconfig.preempt" |
820 | ||
821 | config X86_UP_APIC | |
822 | bool "Local APIC support on uniprocessors" | |
e0c7ae37 | 823 | depends on X86_32 && !SMP && !X86_32_NON_STANDARD |
8f9ca475 | 824 | ---help--- |
506f1d07 SR |
825 | A local APIC (Advanced Programmable Interrupt Controller) is an |
826 | integrated interrupt controller in the CPU. If you have a single-CPU | |
827 | system which has a processor with a local APIC, you can say Y here to | |
828 | enable and use it. If you say Y here even though your machine doesn't | |
829 | have a local APIC, then the kernel will still run with no slowdown at | |
830 | all. The local APIC supports CPU-generated self-interrupts (timer, | |
831 | performance counters), and the NMI watchdog which detects hard | |
832 | lockups. | |
833 | ||
834 | config X86_UP_IOAPIC | |
835 | bool "IO-APIC support on uniprocessors" | |
836 | depends on X86_UP_APIC | |
8f9ca475 | 837 | ---help--- |
506f1d07 SR |
838 | An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an |
839 | SMP-capable replacement for PC-style interrupt controllers. Most | |
840 | SMP systems and many recent uniprocessor systems have one. | |
841 | ||
842 | If you have a single-CPU system with an IO-APIC, you can say Y here | |
843 | to use it. If you say Y here even though your machine doesn't have | |
844 | an IO-APIC, then the kernel will still run with no slowdown at all. | |
845 | ||
846 | config X86_LOCAL_APIC | |
3c2362e6 | 847 | def_bool y |
e0c7ae37 | 848 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC |
506f1d07 SR |
849 | |
850 | config X86_IO_APIC | |
3c2362e6 | 851 | def_bool y |
1444e0c9 | 852 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC |
506f1d07 SR |
853 | |
854 | config X86_VISWS_APIC | |
3c2362e6 | 855 | def_bool y |
506f1d07 | 856 | depends on X86_32 && X86_VISWS |
506f1d07 | 857 | |
41b9eb26 SA |
858 | config X86_REROUTE_FOR_BROKEN_BOOT_IRQS |
859 | bool "Reroute for broken boot IRQs" | |
41b9eb26 | 860 | depends on X86_IO_APIC |
8f9ca475 | 861 | ---help--- |
41b9eb26 SA |
862 | This option enables a workaround that fixes a source of |
863 | spurious interrupts. This is recommended when threaded | |
864 | interrupt handling is used on systems where the generation of | |
865 | superfluous "boot interrupts" cannot be disabled. | |
866 | ||
867 | Some chipsets generate a legacy INTx "boot IRQ" when the IRQ | |
868 | entry in the chipset's IO-APIC is masked (as, e.g. the RT | |
869 | kernel does during interrupt handling). On chipsets where this | |
870 | boot IRQ generation cannot be disabled, this workaround keeps | |
871 | the original IRQ line masked so that only the equivalent "boot | |
872 | IRQ" is delivered to the CPUs. The workaround also tells the | |
873 | kernel to set up the IRQ handler on the boot IRQ line. In this | |
874 | way only one interrupt is delivered to the kernel. Otherwise | |
875 | the spurious second interrupt may cause the kernel to bring | |
876 | down (vital) interrupt lines. | |
877 | ||
878 | Only affects "broken" chipsets. Interrupt sharing may be | |
879 | increased on these systems. | |
880 | ||
506f1d07 | 881 | config X86_MCE |
bab9bc65 | 882 | bool "Machine Check / overheating reporting" |
506f1d07 | 883 | ---help--- |
bab9bc65 AK |
884 | Machine Check support allows the processor to notify the |
885 | kernel if it detects a problem (e.g. overheating, data corruption). | |
506f1d07 | 886 | The action the kernel takes depends on the severity of the problem, |
bab9bc65 | 887 | ranging from warning messages to halting the machine. |
4efc0670 | 888 | |
506f1d07 | 889 | config X86_MCE_INTEL |
3c2362e6 HH |
890 | def_bool y |
891 | prompt "Intel MCE features" | |
c1ebf835 | 892 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 893 | ---help--- |
506f1d07 SR |
894 | Additional support for intel specific MCE features such as |
895 | the thermal monitor. | |
896 | ||
897 | config X86_MCE_AMD | |
3c2362e6 HH |
898 | def_bool y |
899 | prompt "AMD MCE features" | |
c1ebf835 | 900 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 901 | ---help--- |
506f1d07 SR |
902 | Additional support for AMD specific MCE features such as |
903 | the DRAM Error Threshold. | |
904 | ||
4efc0670 | 905 | config X86_ANCIENT_MCE |
6fc108a0 | 906 | bool "Support for old Pentium 5 / WinChip machine checks" |
c31d9633 | 907 | depends on X86_32 && X86_MCE |
cd13adcc HS |
908 | ---help--- |
909 | Include support for machine check handling on old Pentium 5 or WinChip | |
910 | systems. These typically need to be enabled explicitely on the command | |
911 | line. | |
4efc0670 | 912 | |
b2762686 AK |
913 | config X86_MCE_THRESHOLD |
914 | depends on X86_MCE_AMD || X86_MCE_INTEL | |
6fc108a0 | 915 | def_bool y |
b2762686 | 916 | |
ea149b36 | 917 | config X86_MCE_INJECT |
c1ebf835 | 918 | depends on X86_MCE |
ea149b36 AK |
919 | tristate "Machine check injector support" |
920 | ---help--- | |
921 | Provide support for injecting machine checks for testing purposes. | |
922 | If you don't know what a machine check is and you don't do kernel | |
923 | QA it is safe to say n. | |
924 | ||
4efc0670 AK |
925 | config X86_THERMAL_VECTOR |
926 | def_bool y | |
5bb38adc | 927 | depends on X86_MCE_INTEL |
4efc0670 | 928 | |
506f1d07 | 929 | config VM86 |
6a108a14 | 930 | bool "Enable VM86 support" if EXPERT |
506f1d07 SR |
931 | default y |
932 | depends on X86_32 | |
8f9ca475 IM |
933 | ---help--- |
934 | This option is required by programs like DOSEMU to run 16-bit legacy | |
506f1d07 | 935 | code on X86 processors. It also may be needed by software like |
8f9ca475 IM |
936 | XFree86 to initialize some video cards via BIOS. Disabling this |
937 | option saves about 6k. | |
506f1d07 SR |
938 | |
939 | config TOSHIBA | |
940 | tristate "Toshiba Laptop support" | |
941 | depends on X86_32 | |
942 | ---help--- | |
943 | This adds a driver to safely access the System Management Mode of | |
944 | the CPU on Toshiba portables with a genuine Toshiba BIOS. It does | |
945 | not work on models with a Phoenix BIOS. The System Management Mode | |
946 | is used to set the BIOS and power saving options on Toshiba portables. | |
947 | ||
948 | For information on utilities to make use of this driver see the | |
949 | Toshiba Linux utilities web site at: | |
950 | <http://www.buzzard.org.uk/toshiba/>. | |
951 | ||
952 | Say Y if you intend to run this kernel on a Toshiba portable. | |
953 | Say N otherwise. | |
954 | ||
955 | config I8K | |
956 | tristate "Dell laptop support" | |
949a9d70 | 957 | select HWMON |
506f1d07 SR |
958 | ---help--- |
959 | This adds a driver to safely access the System Management Mode | |
960 | of the CPU on the Dell Inspiron 8000. The System Management Mode | |
961 | is used to read cpu temperature and cooling fan status and to | |
962 | control the fans on the I8K portables. | |
963 | ||
964 | This driver has been tested only on the Inspiron 8000 but it may | |
965 | also work with other Dell laptops. You can force loading on other | |
966 | models by passing the parameter `force=1' to the module. Use at | |
967 | your own risk. | |
968 | ||
969 | For information on utilities to make use of this driver see the | |
970 | I8K Linux utilities web site at: | |
971 | <http://people.debian.org/~dz/i8k/> | |
972 | ||
973 | Say Y if you intend to run this kernel on a Dell Inspiron 8000. | |
974 | Say N otherwise. | |
975 | ||
976 | config X86_REBOOTFIXUPS | |
9ba16087 JB |
977 | bool "Enable X86 board specific fixups for reboot" |
978 | depends on X86_32 | |
506f1d07 SR |
979 | ---help--- |
980 | This enables chipset and/or board specific fixups to be done | |
981 | in order to get reboot to work correctly. This is only needed on | |
982 | some combinations of hardware and BIOS. The symptom, for which | |
983 | this config is intended, is when reboot ends with a stalled/hung | |
984 | system. | |
985 | ||
986 | Currently, the only fixup is for the Geode machines using | |
5e3a77e9 | 987 | CS5530A and CS5536 chipsets and the RDC R-321x SoC. |
506f1d07 SR |
988 | |
989 | Say Y if you want to enable the fixup. Currently, it's safe to | |
990 | enable this option even if you don't need it. | |
991 | Say N otherwise. | |
992 | ||
993 | config MICROCODE | |
8d86f390 | 994 | tristate "/dev/cpu/microcode - microcode support" |
506f1d07 SR |
995 | select FW_LOADER |
996 | ---help--- | |
997 | If you say Y here, you will be able to update the microcode on | |
80cc9f10 PO |
998 | certain Intel and AMD processors. The Intel support is for the |
999 | IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, | |
1000 | Pentium 4, Xeon etc. The AMD support is for family 0x10 and | |
1001 | 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra. | |
1002 | You will obviously need the actual microcode binary data itself | |
1003 | which is not shipped with the Linux kernel. | |
506f1d07 | 1004 | |
8d86f390 PO |
1005 | This option selects the general module only, you need to select |
1006 | at least one vendor specific module as well. | |
506f1d07 SR |
1007 | |
1008 | To compile this driver as a module, choose M here: the | |
1009 | module will be called microcode. | |
1010 | ||
8d86f390 | 1011 | config MICROCODE_INTEL |
8f9ca475 IM |
1012 | bool "Intel microcode patch loading support" |
1013 | depends on MICROCODE | |
1014 | default MICROCODE | |
1015 | select FW_LOADER | |
1016 | ---help--- | |
1017 | This options enables microcode patch loading support for Intel | |
1018 | processors. | |
1019 | ||
1020 | For latest news and information on obtaining all the required | |
1021 | Intel ingredients for this driver, check: | |
1022 | <http://www.urbanmyth.org/microcode/>. | |
8d86f390 | 1023 | |
80cc9f10 | 1024 | config MICROCODE_AMD |
8f9ca475 IM |
1025 | bool "AMD microcode patch loading support" |
1026 | depends on MICROCODE | |
1027 | select FW_LOADER | |
1028 | ---help--- | |
1029 | If you select this option, microcode patch loading support for AMD | |
1030 | processors will be enabled. | |
80cc9f10 | 1031 | |
8f9ca475 | 1032 | config MICROCODE_OLD_INTERFACE |
3c2362e6 | 1033 | def_bool y |
506f1d07 | 1034 | depends on MICROCODE |
506f1d07 SR |
1035 | |
1036 | config X86_MSR | |
1037 | tristate "/dev/cpu/*/msr - Model-specific register support" | |
8f9ca475 | 1038 | ---help--- |
506f1d07 SR |
1039 | This device gives privileged processes access to the x86 |
1040 | Model-Specific Registers (MSRs). It is a character device with | |
1041 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. | |
1042 | MSR accesses are directed to a specific CPU on multi-processor | |
1043 | systems. | |
1044 | ||
1045 | config X86_CPUID | |
1046 | tristate "/dev/cpu/*/cpuid - CPU information support" | |
8f9ca475 | 1047 | ---help--- |
506f1d07 SR |
1048 | This device gives processes access to the x86 CPUID instruction to |
1049 | be executed on a specific processor. It is a character device | |
1050 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to | |
1051 | /dev/cpu/31/cpuid. | |
1052 | ||
1053 | choice | |
1054 | prompt "High Memory Support" | |
506f1d07 | 1055 | default HIGHMEM64G if X86_NUMAQ |
6fc108a0 | 1056 | default HIGHMEM4G |
506f1d07 SR |
1057 | depends on X86_32 |
1058 | ||
1059 | config NOHIGHMEM | |
1060 | bool "off" | |
1061 | depends on !X86_NUMAQ | |
1062 | ---help--- | |
1063 | Linux can use up to 64 Gigabytes of physical memory on x86 systems. | |
1064 | However, the address space of 32-bit x86 processors is only 4 | |
1065 | Gigabytes large. That means that, if you have a large amount of | |
1066 | physical memory, not all of it can be "permanently mapped" by the | |
1067 | kernel. The physical memory that's not permanently mapped is called | |
1068 | "high memory". | |
1069 | ||
1070 | If you are compiling a kernel which will never run on a machine with | |
1071 | more than 1 Gigabyte total physical RAM, answer "off" here (default | |
1072 | choice and suitable for most users). This will result in a "3GB/1GB" | |
1073 | split: 3GB are mapped so that each process sees a 3GB virtual memory | |
1074 | space and the remaining part of the 4GB virtual memory space is used | |
1075 | by the kernel to permanently map as much physical memory as | |
1076 | possible. | |
1077 | ||
1078 | If the machine has between 1 and 4 Gigabytes physical RAM, then | |
1079 | answer "4GB" here. | |
1080 | ||
1081 | If more than 4 Gigabytes is used then answer "64GB" here. This | |
1082 | selection turns Intel PAE (Physical Address Extension) mode on. | |
1083 | PAE implements 3-level paging on IA32 processors. PAE is fully | |
1084 | supported by Linux, PAE mode is implemented on all recent Intel | |
1085 | processors (Pentium Pro and better). NOTE: If you say "64GB" here, | |
1086 | then the kernel will not boot on CPUs that don't support PAE! | |
1087 | ||
1088 | The actual amount of total physical memory will either be | |
1089 | auto detected or can be forced by using a kernel command line option | |
1090 | such as "mem=256M". (Try "man bootparam" or see the documentation of | |
1091 | your boot loader (lilo or loadlin) about how to pass options to the | |
1092 | kernel at boot time.) | |
1093 | ||
1094 | If unsure, say "off". | |
1095 | ||
1096 | config HIGHMEM4G | |
1097 | bool "4GB" | |
1098 | depends on !X86_NUMAQ | |
8f9ca475 | 1099 | ---help--- |
506f1d07 SR |
1100 | Select this if you have a 32-bit processor and between 1 and 4 |
1101 | gigabytes of physical RAM. | |
1102 | ||
1103 | config HIGHMEM64G | |
1104 | bool "64GB" | |
1105 | depends on !M386 && !M486 | |
1106 | select X86_PAE | |
8f9ca475 | 1107 | ---help--- |
506f1d07 SR |
1108 | Select this if you have a 32-bit processor and more than 4 |
1109 | gigabytes of physical RAM. | |
1110 | ||
1111 | endchoice | |
1112 | ||
1113 | choice | |
1114 | depends on EXPERIMENTAL | |
6a108a14 | 1115 | prompt "Memory split" if EXPERT |
506f1d07 SR |
1116 | default VMSPLIT_3G |
1117 | depends on X86_32 | |
8f9ca475 | 1118 | ---help--- |
506f1d07 SR |
1119 | Select the desired split between kernel and user memory. |
1120 | ||
1121 | If the address range available to the kernel is less than the | |
1122 | physical memory installed, the remaining memory will be available | |
1123 | as "high memory". Accessing high memory is a little more costly | |
1124 | than low memory, as it needs to be mapped into the kernel first. | |
1125 | Note that increasing the kernel address space limits the range | |
1126 | available to user programs, making the address space there | |
1127 | tighter. Selecting anything other than the default 3G/1G split | |
1128 | will also likely make your kernel incompatible with binary-only | |
1129 | kernel modules. | |
1130 | ||
1131 | If you are not absolutely sure what you are doing, leave this | |
1132 | option alone! | |
1133 | ||
1134 | config VMSPLIT_3G | |
1135 | bool "3G/1G user/kernel split" | |
1136 | config VMSPLIT_3G_OPT | |
1137 | depends on !X86_PAE | |
1138 | bool "3G/1G user/kernel split (for full 1G low memory)" | |
1139 | config VMSPLIT_2G | |
1140 | bool "2G/2G user/kernel split" | |
1141 | config VMSPLIT_2G_OPT | |
1142 | depends on !X86_PAE | |
1143 | bool "2G/2G user/kernel split (for full 2G low memory)" | |
1144 | config VMSPLIT_1G | |
1145 | bool "1G/3G user/kernel split" | |
1146 | endchoice | |
1147 | ||
1148 | config PAGE_OFFSET | |
1149 | hex | |
1150 | default 0xB0000000 if VMSPLIT_3G_OPT | |
1151 | default 0x80000000 if VMSPLIT_2G | |
1152 | default 0x78000000 if VMSPLIT_2G_OPT | |
1153 | default 0x40000000 if VMSPLIT_1G | |
1154 | default 0xC0000000 | |
1155 | depends on X86_32 | |
1156 | ||
1157 | config HIGHMEM | |
3c2362e6 | 1158 | def_bool y |
506f1d07 | 1159 | depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) |
506f1d07 SR |
1160 | |
1161 | config X86_PAE | |
9ba16087 | 1162 | bool "PAE (Physical Address Extension) Support" |
506f1d07 | 1163 | depends on X86_32 && !HIGHMEM4G |
8f9ca475 | 1164 | ---help--- |
506f1d07 SR |
1165 | PAE is required for NX support, and furthermore enables |
1166 | larger swapspace support for non-overcommit purposes. It | |
1167 | has the cost of more pagetable lookup overhead, and also | |
1168 | consumes more pagetable space per process. | |
1169 | ||
600715dc | 1170 | config ARCH_PHYS_ADDR_T_64BIT |
8f9ca475 | 1171 | def_bool X86_64 || X86_PAE |
600715dc | 1172 | |
66f2b061 FT |
1173 | config ARCH_DMA_ADDR_T_64BIT |
1174 | def_bool X86_64 || HIGHMEM64G | |
1175 | ||
9e899816 | 1176 | config DIRECT_GBPAGES |
6a108a14 | 1177 | bool "Enable 1GB pages for kernel pagetables" if EXPERT |
9e899816 NP |
1178 | default y |
1179 | depends on X86_64 | |
8f9ca475 | 1180 | ---help--- |
9e899816 NP |
1181 | Allow the kernel linear mapping to use 1GB pages on CPUs that |
1182 | support it. This can improve the kernel's performance a tiny bit by | |
1183 | reducing TLB pressure. If in doubt, say "Y". | |
1184 | ||
506f1d07 SR |
1185 | # Common NUMA Features |
1186 | config NUMA | |
fd51b2d7 | 1187 | bool "Numa Memory Allocation and Scheduler Support" |
506f1d07 | 1188 | depends on SMP |
604d2055 | 1189 | depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL) |
0699eae1 | 1190 | default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP) |
8f9ca475 | 1191 | ---help--- |
506f1d07 | 1192 | Enable NUMA (Non Uniform Memory Access) support. |
fd51b2d7 | 1193 | |
506f1d07 SR |
1194 | The kernel will try to allocate memory used by a CPU on the |
1195 | local memory controller of the CPU and add some more | |
1196 | NUMA awareness to the kernel. | |
1197 | ||
c280ea5e | 1198 | For 64-bit this is recommended if the system is Intel Core i7 |
fd51b2d7 KM |
1199 | (or later), AMD Opteron, or EM64T NUMA. |
1200 | ||
1201 | For 32-bit this is only needed on (rare) 32-bit-only platforms | |
1202 | that support NUMA topologies, such as NUMAQ / Summit, or if you | |
1203 | boot a 32-bit kernel on a 64-bit NUMA platform. | |
1204 | ||
1205 | Otherwise, you should say N. | |
506f1d07 SR |
1206 | |
1207 | comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI" | |
1208 | depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI) | |
1209 | ||
eec1d4fa | 1210 | config AMD_NUMA |
3c2362e6 HH |
1211 | def_bool y |
1212 | prompt "Old style AMD Opteron NUMA detection" | |
5da0ef9a | 1213 | depends on X86_64 && NUMA && PCI |
8f9ca475 | 1214 | ---help--- |
eec1d4fa HR |
1215 | Enable AMD NUMA node topology detection. You should say Y here if |
1216 | you have a multi processor AMD system. This uses an old method to | |
1217 | read the NUMA configuration directly from the builtin Northbridge | |
1218 | of Opteron. It is recommended to use X86_64_ACPI_NUMA instead, | |
1219 | which also takes priority if both are compiled in. | |
506f1d07 SR |
1220 | |
1221 | config X86_64_ACPI_NUMA | |
3c2362e6 HH |
1222 | def_bool y |
1223 | prompt "ACPI NUMA detection" | |
506f1d07 SR |
1224 | depends on X86_64 && NUMA && ACPI && PCI |
1225 | select ACPI_NUMA | |
8f9ca475 | 1226 | ---help--- |
506f1d07 SR |
1227 | Enable ACPI SRAT based node topology detection. |
1228 | ||
6ec6e0d9 SS |
1229 | # Some NUMA nodes have memory ranges that span |
1230 | # other nodes. Even though a pfn is valid and | |
1231 | # between a node's start and end pfns, it may not | |
1232 | # reside on that node. See memmap_init_zone() | |
1233 | # for details. | |
1234 | config NODES_SPAN_OTHER_NODES | |
1235 | def_bool y | |
1236 | depends on X86_64_ACPI_NUMA | |
1237 | ||
506f1d07 SR |
1238 | config NUMA_EMU |
1239 | bool "NUMA emulation" | |
1b7e03ef | 1240 | depends on NUMA |
8f9ca475 | 1241 | ---help--- |
506f1d07 SR |
1242 | Enable NUMA emulation. A flat machine will be split |
1243 | into virtual nodes when booted with "numa=fake=N", where N is the | |
1244 | number of nodes. This is only useful for debugging. | |
1245 | ||
1246 | config NODES_SHIFT | |
d25e26b6 | 1247 | int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP |
51591e31 DR |
1248 | range 1 10 |
1249 | default "10" if MAXSMP | |
506f1d07 SR |
1250 | default "6" if X86_64 |
1251 | default "4" if X86_NUMAQ | |
1252 | default "3" | |
1253 | depends on NEED_MULTIPLE_NODES | |
8f9ca475 | 1254 | ---help--- |
1184dc2f | 1255 | Specify the maximum number of NUMA Nodes available on the target |
692105b8 | 1256 | system. Increases memory reserved to accommodate various tables. |
506f1d07 | 1257 | |
c1329375 | 1258 | config HAVE_ARCH_BOOTMEM |
3c2362e6 | 1259 | def_bool y |
506f1d07 | 1260 | depends on X86_32 && NUMA |
506f1d07 | 1261 | |
3b16651f TH |
1262 | config HAVE_ARCH_ALLOC_REMAP |
1263 | def_bool y | |
1264 | depends on X86_32 && NUMA | |
1265 | ||
506f1d07 | 1266 | config ARCH_HAVE_MEMORY_PRESENT |
3c2362e6 | 1267 | def_bool y |
506f1d07 | 1268 | depends on X86_32 && DISCONTIGMEM |
506f1d07 SR |
1269 | |
1270 | config NEED_NODE_MEMMAP_SIZE | |
3c2362e6 | 1271 | def_bool y |
506f1d07 | 1272 | depends on X86_32 && (DISCONTIGMEM || SPARSEMEM) |
506f1d07 | 1273 | |
506f1d07 SR |
1274 | config ARCH_FLATMEM_ENABLE |
1275 | def_bool y | |
3b16651f | 1276 | depends on X86_32 && !NUMA |
506f1d07 SR |
1277 | |
1278 | config ARCH_DISCONTIGMEM_ENABLE | |
1279 | def_bool y | |
b263295d | 1280 | depends on NUMA && X86_32 |
506f1d07 SR |
1281 | |
1282 | config ARCH_DISCONTIGMEM_DEFAULT | |
1283 | def_bool y | |
b263295d CL |
1284 | depends on NUMA && X86_32 |
1285 | ||
506f1d07 SR |
1286 | config ARCH_SPARSEMEM_ENABLE |
1287 | def_bool y | |
4272ebfb | 1288 | depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD |
506f1d07 SR |
1289 | select SPARSEMEM_STATIC if X86_32 |
1290 | select SPARSEMEM_VMEMMAP_ENABLE if X86_64 | |
1291 | ||
3b16651f TH |
1292 | config ARCH_SPARSEMEM_DEFAULT |
1293 | def_bool y | |
1294 | depends on X86_64 | |
1295 | ||
506f1d07 SR |
1296 | config ARCH_SELECT_MEMORY_MODEL |
1297 | def_bool y | |
b263295d | 1298 | depends on ARCH_SPARSEMEM_ENABLE |
506f1d07 SR |
1299 | |
1300 | config ARCH_MEMORY_PROBE | |
1301 | def_bool X86_64 | |
1302 | depends on MEMORY_HOTPLUG | |
1303 | ||
3b16651f TH |
1304 | config ARCH_PROC_KCORE_TEXT |
1305 | def_bool y | |
1306 | depends on X86_64 && PROC_KCORE | |
1307 | ||
a29815a3 AK |
1308 | config ILLEGAL_POINTER_VALUE |
1309 | hex | |
1310 | default 0 if X86_32 | |
1311 | default 0xdead000000000000 if X86_64 | |
1312 | ||
506f1d07 SR |
1313 | source "mm/Kconfig" |
1314 | ||
1315 | config HIGHPTE | |
1316 | bool "Allocate 3rd-level pagetables from highmem" | |
6fc108a0 | 1317 | depends on HIGHMEM |
8f9ca475 | 1318 | ---help--- |
506f1d07 SR |
1319 | The VM uses one page table entry for each page of physical memory. |
1320 | For systems with a lot of RAM, this can be wasteful of precious | |
1321 | low memory. Setting this option will put user-space page table | |
1322 | entries in high memory. | |
1323 | ||
9f077871 | 1324 | config X86_CHECK_BIOS_CORRUPTION |
8f9ca475 IM |
1325 | bool "Check for low memory corruption" |
1326 | ---help--- | |
1327 | Periodically check for memory corruption in low memory, which | |
1328 | is suspected to be caused by BIOS. Even when enabled in the | |
1329 | configuration, it is disabled at runtime. Enable it by | |
1330 | setting "memory_corruption_check=1" on the kernel command | |
1331 | line. By default it scans the low 64k of memory every 60 | |
1332 | seconds; see the memory_corruption_check_size and | |
1333 | memory_corruption_check_period parameters in | |
1334 | Documentation/kernel-parameters.txt to adjust this. | |
1335 | ||
1336 | When enabled with the default parameters, this option has | |
1337 | almost no overhead, as it reserves a relatively small amount | |
1338 | of memory and scans it infrequently. It both detects corruption | |
1339 | and prevents it from affecting the running system. | |
1340 | ||
1341 | It is, however, intended as a diagnostic tool; if repeatable | |
1342 | BIOS-originated corruption always affects the same memory, | |
1343 | you can use memmap= to prevent the kernel from using that | |
1344 | memory. | |
9f077871 | 1345 | |
c885df50 | 1346 | config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK |
8f9ca475 | 1347 | bool "Set the default setting of memory_corruption_check" |
c885df50 JF |
1348 | depends on X86_CHECK_BIOS_CORRUPTION |
1349 | default y | |
8f9ca475 IM |
1350 | ---help--- |
1351 | Set whether the default state of memory_corruption_check is | |
1352 | on or off. | |
c885df50 | 1353 | |
9ea77bdb | 1354 | config X86_RESERVE_LOW |
d0cd7425 PA |
1355 | int "Amount of low memory, in kilobytes, to reserve for the BIOS" |
1356 | default 64 | |
1357 | range 4 640 | |
8f9ca475 | 1358 | ---help--- |
d0cd7425 PA |
1359 | Specify the amount of low memory to reserve for the BIOS. |
1360 | ||
1361 | The first page contains BIOS data structures that the kernel | |
1362 | must not use, so that page must always be reserved. | |
1363 | ||
1364 | By default we reserve the first 64K of physical RAM, as a | |
1365 | number of BIOSes are known to corrupt that memory range | |
1366 | during events such as suspend/resume or monitor cable | |
1367 | insertion, so it must not be used by the kernel. | |
fc381519 | 1368 | |
d0cd7425 PA |
1369 | You can set this to 4 if you are absolutely sure that you |
1370 | trust the BIOS to get all its memory reservations and usages | |
1371 | right. If you know your BIOS have problems beyond the | |
1372 | default 64K area, you can set this to 640 to avoid using the | |
1373 | entire low memory range. | |
fc381519 | 1374 | |
d0cd7425 PA |
1375 | If you have doubts about the BIOS (e.g. suspend/resume does |
1376 | not work or there's kernel crashes after certain hardware | |
1377 | hotplug events) then you might want to enable | |
1378 | X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check | |
1379 | typical corruption patterns. | |
fc381519 | 1380 | |
d0cd7425 | 1381 | Leave this to the default value of 64 if you are unsure. |
fc381519 | 1382 | |
506f1d07 SR |
1383 | config MATH_EMULATION |
1384 | bool | |
1385 | prompt "Math emulation" if X86_32 | |
1386 | ---help--- | |
1387 | Linux can emulate a math coprocessor (used for floating point | |
1388 | operations) if you don't have one. 486DX and Pentium processors have | |
1389 | a math coprocessor built in, 486SX and 386 do not, unless you added | |
1390 | a 487DX or 387, respectively. (The messages during boot time can | |
1391 | give you some hints here ["man dmesg"].) Everyone needs either a | |
1392 | coprocessor or this emulation. | |
1393 | ||
1394 | If you don't have a math coprocessor, you need to say Y here; if you | |
1395 | say Y here even though you have a coprocessor, the coprocessor will | |
1396 | be used nevertheless. (This behavior can be changed with the kernel | |
1397 | command line option "no387", which comes handy if your coprocessor | |
1398 | is broken. Try "man bootparam" or see the documentation of your boot | |
1399 | loader (lilo or loadlin) about how to pass options to the kernel at | |
1400 | boot time.) This means that it is a good idea to say Y here if you | |
1401 | intend to use this kernel on different machines. | |
1402 | ||
1403 | More information about the internals of the Linux math coprocessor | |
1404 | emulation can be found in <file:arch/x86/math-emu/README>. | |
1405 | ||
1406 | If you are not sure, say Y; apart from resulting in a 66 KB bigger | |
1407 | kernel, it won't hurt. | |
1408 | ||
1409 | config MTRR | |
6fc108a0 | 1410 | def_bool y |
6a108a14 | 1411 | prompt "MTRR (Memory Type Range Register) support" if EXPERT |
506f1d07 SR |
1412 | ---help--- |
1413 | On Intel P6 family processors (Pentium Pro, Pentium II and later) | |
1414 | the Memory Type Range Registers (MTRRs) may be used to control | |
1415 | processor access to memory ranges. This is most useful if you have | |
1416 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining | |
1417 | allows bus write transfers to be combined into a larger transfer | |
1418 | before bursting over the PCI/AGP bus. This can increase performance | |
1419 | of image write operations 2.5 times or more. Saying Y here creates a | |
1420 | /proc/mtrr file which may be used to manipulate your processor's | |
1421 | MTRRs. Typically the X server should use this. | |
1422 | ||
1423 | This code has a reasonably generic interface so that similar | |
1424 | control registers on other processors can be easily supported | |
1425 | as well: | |
1426 | ||
1427 | The Cyrix 6x86, 6x86MX and M II processors have Address Range | |
1428 | Registers (ARRs) which provide a similar functionality to MTRRs. For | |
1429 | these, the ARRs are used to emulate the MTRRs. | |
1430 | The AMD K6-2 (stepping 8 and above) and K6-3 processors have two | |
1431 | MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing | |
1432 | write-combining. All of these processors are supported by this code | |
1433 | and it makes sense to say Y here if you have one of them. | |
1434 | ||
1435 | Saying Y here also fixes a problem with buggy SMP BIOSes which only | |
1436 | set the MTRRs for the boot CPU and not for the secondary CPUs. This | |
1437 | can lead to all sorts of problems, so it's good to say Y here. | |
1438 | ||
1439 | You can safely say Y even if your machine doesn't have MTRRs, you'll | |
1440 | just add about 9 KB to your kernel. | |
1441 | ||
7225e751 | 1442 | See <file:Documentation/x86/mtrr.txt> for more information. |
506f1d07 | 1443 | |
95ffa243 | 1444 | config MTRR_SANITIZER |
2ffb3501 | 1445 | def_bool y |
95ffa243 YL |
1446 | prompt "MTRR cleanup support" |
1447 | depends on MTRR | |
8f9ca475 | 1448 | ---help--- |
aba3728c TG |
1449 | Convert MTRR layout from continuous to discrete, so X drivers can |
1450 | add writeback entries. | |
95ffa243 | 1451 | |
aba3728c | 1452 | Can be disabled with disable_mtrr_cleanup on the kernel command line. |
692105b8 | 1453 | The largest mtrr entry size for a continuous block can be set with |
aba3728c | 1454 | mtrr_chunk_size. |
95ffa243 | 1455 | |
2ffb3501 | 1456 | If unsure, say Y. |
95ffa243 YL |
1457 | |
1458 | config MTRR_SANITIZER_ENABLE_DEFAULT | |
f5098d62 YL |
1459 | int "MTRR cleanup enable value (0-1)" |
1460 | range 0 1 | |
1461 | default "0" | |
95ffa243 | 1462 | depends on MTRR_SANITIZER |
8f9ca475 | 1463 | ---help--- |
f5098d62 | 1464 | Enable mtrr cleanup default value |
95ffa243 | 1465 | |
12031a62 YL |
1466 | config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT |
1467 | int "MTRR cleanup spare reg num (0-7)" | |
1468 | range 0 7 | |
1469 | default "1" | |
1470 | depends on MTRR_SANITIZER | |
8f9ca475 | 1471 | ---help--- |
12031a62 | 1472 | mtrr cleanup spare entries default, it can be changed via |
aba3728c | 1473 | mtrr_spare_reg_nr=N on the kernel command line. |
12031a62 | 1474 | |
2e5d9c85 | 1475 | config X86_PAT |
6fc108a0 | 1476 | def_bool y |
6a108a14 | 1477 | prompt "x86 PAT support" if EXPERT |
2a8a2719 | 1478 | depends on MTRR |
8f9ca475 | 1479 | ---help--- |
2e5d9c85 | 1480 | Use PAT attributes to setup page level cache control. |
042b78e4 | 1481 | |
2e5d9c85 | 1482 | PATs are the modern equivalents of MTRRs and are much more |
1483 | flexible than MTRRs. | |
1484 | ||
1485 | Say N here if you see bootup problems (boot crash, boot hang, | |
042b78e4 | 1486 | spontaneous reboots) or a non-working video driver. |
2e5d9c85 | 1487 | |
1488 | If unsure, say Y. | |
1489 | ||
46cf98cd VP |
1490 | config ARCH_USES_PG_UNCACHED |
1491 | def_bool y | |
1492 | depends on X86_PAT | |
1493 | ||
628c6246 PA |
1494 | config ARCH_RANDOM |
1495 | def_bool y | |
1496 | prompt "x86 architectural random number generator" if EXPERT | |
1497 | ---help--- | |
1498 | Enable the x86 architectural RDRAND instruction | |
1499 | (Intel Bull Mountain technology) to generate random numbers. | |
1500 | If supported, this is a high bandwidth, cryptographically | |
1501 | secure hardware random number generator. | |
1502 | ||
506f1d07 | 1503 | config EFI |
9ba16087 | 1504 | bool "EFI runtime service support" |
5b83683f | 1505 | depends on ACPI |
506f1d07 | 1506 | ---help--- |
8f9ca475 IM |
1507 | This enables the kernel to use EFI runtime services that are |
1508 | available (such as the EFI variable services). | |
506f1d07 | 1509 | |
8f9ca475 IM |
1510 | This option is only useful on systems that have EFI firmware. |
1511 | In addition, you should use the latest ELILO loader available | |
1512 | at <http://elilo.sourceforge.net> in order to take advantage | |
1513 | of EFI runtime services. However, even with this option, the | |
1514 | resultant kernel should continue to boot on existing non-EFI | |
1515 | platforms. | |
506f1d07 | 1516 | |
291f3632 MF |
1517 | config EFI_STUB |
1518 | bool "EFI stub support" | |
1519 | depends on EFI | |
1520 | ---help--- | |
1521 | This kernel feature allows a bzImage to be loaded directly | |
1522 | by EFI firmware without the use of a bootloader. | |
1523 | ||
506f1d07 | 1524 | config SECCOMP |
3c2362e6 HH |
1525 | def_bool y |
1526 | prompt "Enable seccomp to safely compute untrusted bytecode" | |
8f9ca475 | 1527 | ---help--- |
506f1d07 SR |
1528 | This kernel feature is useful for number crunching applications |
1529 | that may need to compute untrusted bytecode during their | |
1530 | execution. By using pipes or other transports made available to | |
1531 | the process as file descriptors supporting the read/write | |
1532 | syscalls, it's possible to isolate those applications in | |
1533 | their own address space using seccomp. Once seccomp is | |
9c0bbee8 | 1534 | enabled via prctl(PR_SET_SECCOMP), it cannot be disabled |
506f1d07 SR |
1535 | and the task is only allowed to execute a few safe syscalls |
1536 | defined by each seccomp mode. | |
1537 | ||
1538 | If unsure, say Y. Only embedded should say N here. | |
1539 | ||
1540 | config CC_STACKPROTECTOR | |
1541 | bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)" | |
8f9ca475 IM |
1542 | ---help--- |
1543 | This option turns on the -fstack-protector GCC feature. This | |
113c5413 IM |
1544 | feature puts, at the beginning of functions, a canary value on |
1545 | the stack just before the return address, and validates | |
506f1d07 SR |
1546 | the value just before actually returning. Stack based buffer |
1547 | overflows (that need to overwrite this return address) now also | |
1548 | overwrite the canary, which gets detected and the attack is then | |
1549 | neutralized via a kernel panic. | |
1550 | ||
1551 | This feature requires gcc version 4.2 or above, or a distribution | |
1552 | gcc with the feature backported. Older versions are automatically | |
113c5413 IM |
1553 | detected and for those versions, this configuration option is |
1554 | ignored. (and a warning is printed during bootup) | |
506f1d07 SR |
1555 | |
1556 | source kernel/Kconfig.hz | |
1557 | ||
1558 | config KEXEC | |
1559 | bool "kexec system call" | |
8f9ca475 | 1560 | ---help--- |
506f1d07 SR |
1561 | kexec is a system call that implements the ability to shutdown your |
1562 | current kernel, and to start another kernel. It is like a reboot | |
1563 | but it is independent of the system firmware. And like a reboot | |
1564 | you can start any kernel with it, not just Linux. | |
1565 | ||
1566 | The name comes from the similarity to the exec system call. | |
1567 | ||
1568 | It is an ongoing process to be certain the hardware in a machine | |
1569 | is properly shutdown, so do not be surprised if this code does not | |
1570 | initially work for you. It may help to enable device hotplugging | |
1571 | support. As of this writing the exact hardware interface is | |
1572 | strongly in flux, so no good recommendation can be made. | |
1573 | ||
1574 | config CRASH_DUMP | |
04b69447 | 1575 | bool "kernel crash dumps" |
506f1d07 | 1576 | depends on X86_64 || (X86_32 && HIGHMEM) |
8f9ca475 | 1577 | ---help--- |
506f1d07 SR |
1578 | Generate crash dump after being started by kexec. |
1579 | This should be normally only set in special crash dump kernels | |
1580 | which are loaded in the main kernel with kexec-tools into | |
1581 | a specially reserved region and then later executed after | |
1582 | a crash by kdump/kexec. The crash dump kernel must be compiled | |
1583 | to a memory address not used by the main kernel or BIOS using | |
1584 | PHYSICAL_START, or it must be built as a relocatable image | |
1585 | (CONFIG_RELOCATABLE=y). | |
1586 | For more details see Documentation/kdump/kdump.txt | |
1587 | ||
3ab83521 HY |
1588 | config KEXEC_JUMP |
1589 | bool "kexec jump (EXPERIMENTAL)" | |
1590 | depends on EXPERIMENTAL | |
fee7b0d8 | 1591 | depends on KEXEC && HIBERNATION |
8f9ca475 | 1592 | ---help--- |
89081d17 HY |
1593 | Jump between original kernel and kexeced kernel and invoke |
1594 | code in physical address mode via KEXEC | |
3ab83521 | 1595 | |
506f1d07 | 1596 | config PHYSICAL_START |
6a108a14 | 1597 | hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP) |
ceefccc9 | 1598 | default "0x1000000" |
8f9ca475 | 1599 | ---help--- |
506f1d07 SR |
1600 | This gives the physical address where the kernel is loaded. |
1601 | ||
1602 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then | |
1603 | bzImage will decompress itself to above physical address and | |
1604 | run from there. Otherwise, bzImage will run from the address where | |
1605 | it has been loaded by the boot loader and will ignore above physical | |
1606 | address. | |
1607 | ||
1608 | In normal kdump cases one does not have to set/change this option | |
1609 | as now bzImage can be compiled as a completely relocatable image | |
1610 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different | |
1611 | address. This option is mainly useful for the folks who don't want | |
1612 | to use a bzImage for capturing the crash dump and want to use a | |
1613 | vmlinux instead. vmlinux is not relocatable hence a kernel needs | |
1614 | to be specifically compiled to run from a specific memory area | |
1615 | (normally a reserved region) and this option comes handy. | |
1616 | ||
ceefccc9 PA |
1617 | So if you are using bzImage for capturing the crash dump, |
1618 | leave the value here unchanged to 0x1000000 and set | |
1619 | CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux | |
1620 | for capturing the crash dump change this value to start of | |
1621 | the reserved region. In other words, it can be set based on | |
1622 | the "X" value as specified in the "crashkernel=YM@XM" | |
1623 | command line boot parameter passed to the panic-ed | |
1624 | kernel. Please take a look at Documentation/kdump/kdump.txt | |
1625 | for more details about crash dumps. | |
506f1d07 SR |
1626 | |
1627 | Usage of bzImage for capturing the crash dump is recommended as | |
1628 | one does not have to build two kernels. Same kernel can be used | |
1629 | as production kernel and capture kernel. Above option should have | |
1630 | gone away after relocatable bzImage support is introduced. But it | |
1631 | is present because there are users out there who continue to use | |
1632 | vmlinux for dump capture. This option should go away down the | |
1633 | line. | |
1634 | ||
1635 | Don't change this unless you know what you are doing. | |
1636 | ||
1637 | config RELOCATABLE | |
26717808 PA |
1638 | bool "Build a relocatable kernel" |
1639 | default y | |
8f9ca475 | 1640 | ---help--- |
506f1d07 SR |
1641 | This builds a kernel image that retains relocation information |
1642 | so it can be loaded someplace besides the default 1MB. | |
1643 | The relocations tend to make the kernel binary about 10% larger, | |
1644 | but are discarded at runtime. | |
1645 | ||
1646 | One use is for the kexec on panic case where the recovery kernel | |
1647 | must live at a different physical address than the primary | |
1648 | kernel. | |
1649 | ||
1650 | Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address | |
1651 | it has been loaded at and the compile time physical address | |
1652 | (CONFIG_PHYSICAL_START) is ignored. | |
1653 | ||
845adf72 PA |
1654 | # Relocation on x86-32 needs some additional build support |
1655 | config X86_NEED_RELOCS | |
1656 | def_bool y | |
1657 | depends on X86_32 && RELOCATABLE | |
1658 | ||
506f1d07 | 1659 | config PHYSICAL_ALIGN |
6fc108a0 | 1660 | hex "Alignment value to which kernel should be aligned" if X86_32 |
ceefccc9 PA |
1661 | default "0x1000000" |
1662 | range 0x2000 0x1000000 | |
8f9ca475 | 1663 | ---help--- |
506f1d07 SR |
1664 | This value puts the alignment restrictions on physical address |
1665 | where kernel is loaded and run from. Kernel is compiled for an | |
1666 | address which meets above alignment restriction. | |
1667 | ||
1668 | If bootloader loads the kernel at a non-aligned address and | |
1669 | CONFIG_RELOCATABLE is set, kernel will move itself to nearest | |
1670 | address aligned to above value and run from there. | |
1671 | ||
1672 | If bootloader loads the kernel at a non-aligned address and | |
1673 | CONFIG_RELOCATABLE is not set, kernel will ignore the run time | |
1674 | load address and decompress itself to the address it has been | |
1675 | compiled for and run from there. The address for which kernel is | |
1676 | compiled already meets above alignment restrictions. Hence the | |
1677 | end result is that kernel runs from a physical address meeting | |
1678 | above alignment restrictions. | |
1679 | ||
1680 | Don't change this unless you know what you are doing. | |
1681 | ||
1682 | config HOTPLUG_CPU | |
7c13e6a3 | 1683 | bool "Support for hot-pluggable CPUs" |
4b19ed91 | 1684 | depends on SMP && HOTPLUG |
506f1d07 | 1685 | ---help--- |
7c13e6a3 DS |
1686 | Say Y here to allow turning CPUs off and on. CPUs can be |
1687 | controlled through /sys/devices/system/cpu. | |
1688 | ( Note: power management support will enable this option | |
1689 | automatically on SMP systems. ) | |
1690 | Say N if you want to disable CPU hotplug. | |
506f1d07 SR |
1691 | |
1692 | config COMPAT_VDSO | |
3c2362e6 HH |
1693 | def_bool y |
1694 | prompt "Compat VDSO support" | |
af65d648 | 1695 | depends on X86_32 || IA32_EMULATION |
8f9ca475 | 1696 | ---help--- |
af65d648 | 1697 | Map the 32-bit VDSO to the predictable old-style address too. |
e84446de | 1698 | |
506f1d07 SR |
1699 | Say N here if you are running a sufficiently recent glibc |
1700 | version (2.3.3 or later), to remove the high-mapped | |
1701 | VDSO mapping and to exclusively use the randomized VDSO. | |
1702 | ||
1703 | If unsure, say Y. | |
1704 | ||
516cbf37 TB |
1705 | config CMDLINE_BOOL |
1706 | bool "Built-in kernel command line" | |
8f9ca475 | 1707 | ---help--- |
516cbf37 TB |
1708 | Allow for specifying boot arguments to the kernel at |
1709 | build time. On some systems (e.g. embedded ones), it is | |
1710 | necessary or convenient to provide some or all of the | |
1711 | kernel boot arguments with the kernel itself (that is, | |
1712 | to not rely on the boot loader to provide them.) | |
1713 | ||
1714 | To compile command line arguments into the kernel, | |
1715 | set this option to 'Y', then fill in the | |
1716 | the boot arguments in CONFIG_CMDLINE. | |
1717 | ||
1718 | Systems with fully functional boot loaders (i.e. non-embedded) | |
1719 | should leave this option set to 'N'. | |
1720 | ||
1721 | config CMDLINE | |
1722 | string "Built-in kernel command string" | |
1723 | depends on CMDLINE_BOOL | |
1724 | default "" | |
8f9ca475 | 1725 | ---help--- |
516cbf37 TB |
1726 | Enter arguments here that should be compiled into the kernel |
1727 | image and used at boot time. If the boot loader provides a | |
1728 | command line at boot time, it is appended to this string to | |
1729 | form the full kernel command line, when the system boots. | |
1730 | ||
1731 | However, you can use the CONFIG_CMDLINE_OVERRIDE option to | |
1732 | change this behavior. | |
1733 | ||
1734 | In most cases, the command line (whether built-in or provided | |
1735 | by the boot loader) should specify the device for the root | |
1736 | file system. | |
1737 | ||
1738 | config CMDLINE_OVERRIDE | |
1739 | bool "Built-in command line overrides boot loader arguments" | |
516cbf37 | 1740 | depends on CMDLINE_BOOL |
8f9ca475 | 1741 | ---help--- |
516cbf37 TB |
1742 | Set this option to 'Y' to have the kernel ignore the boot loader |
1743 | command line, and use ONLY the built-in command line. | |
1744 | ||
1745 | This is used to work around broken boot loaders. This should | |
1746 | be set to 'N' under normal conditions. | |
1747 | ||
506f1d07 SR |
1748 | endmenu |
1749 | ||
1750 | config ARCH_ENABLE_MEMORY_HOTPLUG | |
1751 | def_bool y | |
1752 | depends on X86_64 || (X86_32 && HIGHMEM) | |
1753 | ||
35551053 GH |
1754 | config ARCH_ENABLE_MEMORY_HOTREMOVE |
1755 | def_bool y | |
1756 | depends on MEMORY_HOTPLUG | |
1757 | ||
e534c7c5 | 1758 | config USE_PERCPU_NUMA_NODE_ID |
645a7919 | 1759 | def_bool y |
e534c7c5 LS |
1760 | depends on NUMA |
1761 | ||
da85f865 | 1762 | menu "Power management and ACPI options" |
e279b6c1 SR |
1763 | |
1764 | config ARCH_HIBERNATION_HEADER | |
3c2362e6 | 1765 | def_bool y |
e279b6c1 | 1766 | depends on X86_64 && HIBERNATION |
e279b6c1 SR |
1767 | |
1768 | source "kernel/power/Kconfig" | |
1769 | ||
1770 | source "drivers/acpi/Kconfig" | |
1771 | ||
efafc8b2 FT |
1772 | source "drivers/sfi/Kconfig" |
1773 | ||
a6b68076 | 1774 | config X86_APM_BOOT |
6fc108a0 | 1775 | def_bool y |
282e5aab | 1776 | depends on APM |
a6b68076 | 1777 | |
e279b6c1 SR |
1778 | menuconfig APM |
1779 | tristate "APM (Advanced Power Management) BIOS support" | |
efefa6f6 | 1780 | depends on X86_32 && PM_SLEEP |
e279b6c1 SR |
1781 | ---help--- |
1782 | APM is a BIOS specification for saving power using several different | |
1783 | techniques. This is mostly useful for battery powered laptops with | |
1784 | APM compliant BIOSes. If you say Y here, the system time will be | |
1785 | reset after a RESUME operation, the /proc/apm device will provide | |
1786 | battery status information, and user-space programs will receive | |
1787 | notification of APM "events" (e.g. battery status change). | |
1788 | ||
1789 | If you select "Y" here, you can disable actual use of the APM | |
1790 | BIOS by passing the "apm=off" option to the kernel at boot time. | |
1791 | ||
1792 | Note that the APM support is almost completely disabled for | |
1793 | machines with more than one CPU. | |
1794 | ||
1795 | In order to use APM, you will need supporting software. For location | |
2dc98fd3 MW |
1796 | and more information, read <file:Documentation/power/apm-acpi.txt> |
1797 | and the Battery Powered Linux mini-HOWTO, available from | |
e279b6c1 SR |
1798 | <http://www.tldp.org/docs.html#howto>. |
1799 | ||
1800 | This driver does not spin down disk drives (see the hdparm(8) | |
1801 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
1802 | VESA-compliant "green" monitors. | |
1803 | ||
1804 | This driver does not support the TI 4000M TravelMate and the ACER | |
1805 | 486/DX4/75 because they don't have compliant BIOSes. Many "green" | |
1806 | desktop machines also don't have compliant BIOSes, and this driver | |
1807 | may cause those machines to panic during the boot phase. | |
1808 | ||
1809 | Generally, if you don't have a battery in your machine, there isn't | |
1810 | much point in using this driver and you should say N. If you get | |
1811 | random kernel OOPSes or reboots that don't seem to be related to | |
1812 | anything, try disabling/enabling this option (or disabling/enabling | |
1813 | APM in your BIOS). | |
1814 | ||
1815 | Some other things you should try when experiencing seemingly random, | |
1816 | "weird" problems: | |
1817 | ||
1818 | 1) make sure that you have enough swap space and that it is | |
1819 | enabled. | |
1820 | 2) pass the "no-hlt" option to the kernel | |
1821 | 3) switch on floating point emulation in the kernel and pass | |
1822 | the "no387" option to the kernel | |
1823 | 4) pass the "floppy=nodma" option to the kernel | |
1824 | 5) pass the "mem=4M" option to the kernel (thereby disabling | |
1825 | all but the first 4 MB of RAM) | |
1826 | 6) make sure that the CPU is not over clocked. | |
1827 | 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> | |
1828 | 8) disable the cache from your BIOS settings | |
1829 | 9) install a fan for the video card or exchange video RAM | |
1830 | 10) install a better fan for the CPU | |
1831 | 11) exchange RAM chips | |
1832 | 12) exchange the motherboard. | |
1833 | ||
1834 | To compile this driver as a module, choose M here: the | |
1835 | module will be called apm. | |
1836 | ||
1837 | if APM | |
1838 | ||
1839 | config APM_IGNORE_USER_SUSPEND | |
1840 | bool "Ignore USER SUSPEND" | |
8f9ca475 | 1841 | ---help--- |
e279b6c1 SR |
1842 | This option will ignore USER SUSPEND requests. On machines with a |
1843 | compliant APM BIOS, you want to say N. However, on the NEC Versa M | |
1844 | series notebooks, it is necessary to say Y because of a BIOS bug. | |
1845 | ||
1846 | config APM_DO_ENABLE | |
1847 | bool "Enable PM at boot time" | |
1848 | ---help--- | |
1849 | Enable APM features at boot time. From page 36 of the APM BIOS | |
1850 | specification: "When disabled, the APM BIOS does not automatically | |
1851 | power manage devices, enter the Standby State, enter the Suspend | |
1852 | State, or take power saving steps in response to CPU Idle calls." | |
1853 | This driver will make CPU Idle calls when Linux is idle (unless this | |
1854 | feature is turned off -- see "Do CPU IDLE calls", below). This | |
1855 | should always save battery power, but more complicated APM features | |
1856 | will be dependent on your BIOS implementation. You may need to turn | |
1857 | this option off if your computer hangs at boot time when using APM | |
1858 | support, or if it beeps continuously instead of suspending. Turn | |
1859 | this off if you have a NEC UltraLite Versa 33/C or a Toshiba | |
1860 | T400CDT. This is off by default since most machines do fine without | |
1861 | this feature. | |
1862 | ||
1863 | config APM_CPU_IDLE | |
1864 | bool "Make CPU Idle calls when idle" | |
8f9ca475 | 1865 | ---help--- |
e279b6c1 SR |
1866 | Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. |
1867 | On some machines, this can activate improved power savings, such as | |
1868 | a slowed CPU clock rate, when the machine is idle. These idle calls | |
1869 | are made after the idle loop has run for some length of time (e.g., | |
1870 | 333 mS). On some machines, this will cause a hang at boot time or | |
1871 | whenever the CPU becomes idle. (On machines with more than one CPU, | |
1872 | this option does nothing.) | |
1873 | ||
1874 | config APM_DISPLAY_BLANK | |
1875 | bool "Enable console blanking using APM" | |
8f9ca475 | 1876 | ---help--- |
e279b6c1 SR |
1877 | Enable console blanking using the APM. Some laptops can use this to |
1878 | turn off the LCD backlight when the screen blanker of the Linux | |
1879 | virtual console blanks the screen. Note that this is only used by | |
1880 | the virtual console screen blanker, and won't turn off the backlight | |
1881 | when using the X Window system. This also doesn't have anything to | |
1882 | do with your VESA-compliant power-saving monitor. Further, this | |
1883 | option doesn't work for all laptops -- it might not turn off your | |
1884 | backlight at all, or it might print a lot of errors to the console, | |
1885 | especially if you are using gpm. | |
1886 | ||
1887 | config APM_ALLOW_INTS | |
1888 | bool "Allow interrupts during APM BIOS calls" | |
8f9ca475 | 1889 | ---help--- |
e279b6c1 SR |
1890 | Normally we disable external interrupts while we are making calls to |
1891 | the APM BIOS as a measure to lessen the effects of a badly behaving | |
1892 | BIOS implementation. The BIOS should reenable interrupts if it | |
1893 | needs to. Unfortunately, some BIOSes do not -- especially those in | |
1894 | many of the newer IBM Thinkpads. If you experience hangs when you | |
1895 | suspend, try setting this to Y. Otherwise, say N. | |
1896 | ||
e279b6c1 SR |
1897 | endif # APM |
1898 | ||
bb0a56ec | 1899 | source "drivers/cpufreq/Kconfig" |
e279b6c1 SR |
1900 | |
1901 | source "drivers/cpuidle/Kconfig" | |
1902 | ||
27471fdb AH |
1903 | source "drivers/idle/Kconfig" |
1904 | ||
e279b6c1 SR |
1905 | endmenu |
1906 | ||
1907 | ||
1908 | menu "Bus options (PCI etc.)" | |
1909 | ||
1910 | config PCI | |
1ac97018 | 1911 | bool "PCI support" |
1c858087 | 1912 | default y |
e279b6c1 | 1913 | select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC) |
8f9ca475 | 1914 | ---help--- |
e279b6c1 SR |
1915 | Find out whether you have a PCI motherboard. PCI is the name of a |
1916 | bus system, i.e. the way the CPU talks to the other stuff inside | |
1917 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | |
1918 | VESA. If you have PCI, say Y, otherwise N. | |
1919 | ||
e279b6c1 SR |
1920 | choice |
1921 | prompt "PCI access mode" | |
efefa6f6 | 1922 | depends on X86_32 && PCI |
e279b6c1 SR |
1923 | default PCI_GOANY |
1924 | ---help--- | |
1925 | On PCI systems, the BIOS can be used to detect the PCI devices and | |
1926 | determine their configuration. However, some old PCI motherboards | |
1927 | have BIOS bugs and may crash if this is done. Also, some embedded | |
1928 | PCI-based systems don't have any BIOS at all. Linux can also try to | |
1929 | detect the PCI hardware directly without using the BIOS. | |
1930 | ||
1931 | With this option, you can specify how Linux should detect the | |
1932 | PCI devices. If you choose "BIOS", the BIOS will be used, | |
1933 | if you choose "Direct", the BIOS won't be used, and if you | |
1934 | choose "MMConfig", then PCI Express MMCONFIG will be used. | |
1935 | If you choose "Any", the kernel will try MMCONFIG, then the | |
1936 | direct access method and falls back to the BIOS if that doesn't | |
1937 | work. If unsure, go with the default, which is "Any". | |
1938 | ||
1939 | config PCI_GOBIOS | |
1940 | bool "BIOS" | |
1941 | ||
1942 | config PCI_GOMMCONFIG | |
1943 | bool "MMConfig" | |
1944 | ||
1945 | config PCI_GODIRECT | |
1946 | bool "Direct" | |
1947 | ||
3ef0e1f8 | 1948 | config PCI_GOOLPC |
76fb6570 | 1949 | bool "OLPC XO-1" |
3ef0e1f8 AS |
1950 | depends on OLPC |
1951 | ||
2bdd1b03 AS |
1952 | config PCI_GOANY |
1953 | bool "Any" | |
1954 | ||
e279b6c1 SR |
1955 | endchoice |
1956 | ||
1957 | config PCI_BIOS | |
3c2362e6 | 1958 | def_bool y |
efefa6f6 | 1959 | depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY) |
e279b6c1 SR |
1960 | |
1961 | # x86-64 doesn't support PCI BIOS access from long mode so always go direct. | |
1962 | config PCI_DIRECT | |
3c2362e6 | 1963 | def_bool y |
0aba496f | 1964 | depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG)) |
e279b6c1 SR |
1965 | |
1966 | config PCI_MMCONFIG | |
3c2362e6 | 1967 | def_bool y |
5f0db7a2 | 1968 | depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY) |
e279b6c1 | 1969 | |
3ef0e1f8 | 1970 | config PCI_OLPC |
2bdd1b03 AS |
1971 | def_bool y |
1972 | depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY) | |
3ef0e1f8 | 1973 | |
b5401a96 AN |
1974 | config PCI_XEN |
1975 | def_bool y | |
1976 | depends on PCI && XEN | |
1977 | select SWIOTLB_XEN | |
1978 | ||
e279b6c1 | 1979 | config PCI_DOMAINS |
3c2362e6 | 1980 | def_bool y |
e279b6c1 | 1981 | depends on PCI |
e279b6c1 SR |
1982 | |
1983 | config PCI_MMCONFIG | |
1984 | bool "Support mmconfig PCI config space access" | |
1985 | depends on X86_64 && PCI && ACPI | |
1986 | ||
3f6ea84a | 1987 | config PCI_CNB20LE_QUIRK |
6a108a14 | 1988 | bool "Read CNB20LE Host Bridge Windows" if EXPERT |
64a5fed6 BH |
1989 | default n |
1990 | depends on PCI && EXPERIMENTAL | |
3f6ea84a IS |
1991 | help |
1992 | Read the PCI windows out of the CNB20LE host bridge. This allows | |
1993 | PCI hotplug to work on systems with the CNB20LE chipset which do | |
1994 | not have ACPI. | |
1995 | ||
64a5fed6 BH |
1996 | There's no public spec for this chipset, and this functionality |
1997 | is known to be incomplete. | |
1998 | ||
1999 | You should say N unless you know you need this. | |
2000 | ||
e279b6c1 SR |
2001 | source "drivers/pci/pcie/Kconfig" |
2002 | ||
2003 | source "drivers/pci/Kconfig" | |
2004 | ||
1c00f016 | 2005 | # x86_64 have no ISA slots, but can have ISA-style DMA. |
e279b6c1 | 2006 | config ISA_DMA_API |
1c00f016 DR |
2007 | bool "ISA-style DMA support" if (X86_64 && EXPERT) |
2008 | default y | |
2009 | help | |
2010 | Enables ISA-style DMA support for devices requiring such controllers. | |
2011 | If unsure, say Y. | |
e279b6c1 SR |
2012 | |
2013 | if X86_32 | |
2014 | ||
2015 | config ISA | |
2016 | bool "ISA support" | |
8f9ca475 | 2017 | ---help--- |
e279b6c1 SR |
2018 | Find out whether you have ISA slots on your motherboard. ISA is the |
2019 | name of a bus system, i.e. the way the CPU talks to the other stuff | |
2020 | inside your box. Other bus systems are PCI, EISA, MicroChannel | |
2021 | (MCA) or VESA. ISA is an older system, now being displaced by PCI; | |
2022 | newer boards don't support it. If you have ISA, say Y, otherwise N. | |
2023 | ||
2024 | config EISA | |
2025 | bool "EISA support" | |
2026 | depends on ISA | |
2027 | ---help--- | |
2028 | The Extended Industry Standard Architecture (EISA) bus was | |
2029 | developed as an open alternative to the IBM MicroChannel bus. | |
2030 | ||
2031 | The EISA bus provided some of the features of the IBM MicroChannel | |
2032 | bus while maintaining backward compatibility with cards made for | |
2033 | the older ISA bus. The EISA bus saw limited use between 1988 and | |
2034 | 1995 when it was made obsolete by the PCI bus. | |
2035 | ||
2036 | Say Y here if you are building a kernel for an EISA-based machine. | |
2037 | ||
2038 | Otherwise, say N. | |
2039 | ||
2040 | source "drivers/eisa/Kconfig" | |
2041 | ||
2042 | config MCA | |
72ee6ebb | 2043 | bool "MCA support" |
8f9ca475 | 2044 | ---help--- |
e279b6c1 SR |
2045 | MicroChannel Architecture is found in some IBM PS/2 machines and |
2046 | laptops. It is a bus system similar to PCI or ISA. See | |
2047 | <file:Documentation/mca.txt> (and especially the web page given | |
2048 | there) before attempting to build an MCA bus kernel. | |
2049 | ||
2050 | source "drivers/mca/Kconfig" | |
2051 | ||
2052 | config SCx200 | |
2053 | tristate "NatSemi SCx200 support" | |
8f9ca475 | 2054 | ---help--- |
e279b6c1 SR |
2055 | This provides basic support for National Semiconductor's |
2056 | (now AMD's) Geode processors. The driver probes for the | |
2057 | PCI-IDs of several on-chip devices, so its a good dependency | |
2058 | for other scx200_* drivers. | |
2059 | ||
2060 | If compiled as a module, the driver is named scx200. | |
2061 | ||
2062 | config SCx200HR_TIMER | |
2063 | tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" | |
592913ec | 2064 | depends on SCx200 |
e279b6c1 | 2065 | default y |
8f9ca475 | 2066 | ---help--- |
e279b6c1 SR |
2067 | This driver provides a clocksource built upon the on-chip |
2068 | 27MHz high-resolution timer. Its also a workaround for | |
2069 | NSC Geode SC-1100's buggy TSC, which loses time when the | |
2070 | processor goes idle (as is done by the scheduler). The | |
2071 | other workaround is idle=poll boot option. | |
2072 | ||
3ef0e1f8 AS |
2073 | config OLPC |
2074 | bool "One Laptop Per Child support" | |
54008979 | 2075 | depends on !X86_PAE |
3c554946 | 2076 | select GPIOLIB |
dc3119e7 | 2077 | select OF |
45bb1674 | 2078 | select OF_PROMTREE |
8f9ca475 | 2079 | ---help--- |
3ef0e1f8 AS |
2080 | Add support for detecting the unique features of the OLPC |
2081 | XO hardware. | |
2082 | ||
a3128588 DD |
2083 | config OLPC_XO1_PM |
2084 | bool "OLPC XO-1 Power Management" | |
97c4cb71 | 2085 | depends on OLPC && MFD_CS5535 && PM_SLEEP |
a3128588 | 2086 | select MFD_CORE |
bf1ebf00 | 2087 | ---help--- |
97c4cb71 | 2088 | Add support for poweroff and suspend of the OLPC XO-1 laptop. |
bf1ebf00 | 2089 | |
cfee9597 DD |
2090 | config OLPC_XO1_RTC |
2091 | bool "OLPC XO-1 Real Time Clock" | |
2092 | depends on OLPC_XO1_PM && RTC_DRV_CMOS | |
2093 | ---help--- | |
2094 | Add support for the XO-1 real time clock, which can be used as a | |
2095 | programmable wakeup source. | |
2096 | ||
7feda8e9 DD |
2097 | config OLPC_XO1_SCI |
2098 | bool "OLPC XO-1 SCI extras" | |
d8d01a63 DD |
2099 | depends on OLPC && OLPC_XO1_PM |
2100 | select POWER_SUPPLY | |
7feda8e9 DD |
2101 | select GPIO_CS5535 |
2102 | select MFD_CORE | |
2103 | ---help--- | |
2104 | Add support for SCI-based features of the OLPC XO-1 laptop: | |
7bc74b3d | 2105 | - EC-driven system wakeups |
7feda8e9 | 2106 | - Power button |
7bc74b3d | 2107 | - Ebook switch |
2cf2baea | 2108 | - Lid switch |
e1040ac6 DD |
2109 | - AC adapter status updates |
2110 | - Battery status updates | |
7feda8e9 | 2111 | |
a0f30f59 DD |
2112 | config OLPC_XO15_SCI |
2113 | bool "OLPC XO-1.5 SCI extras" | |
d8d01a63 DD |
2114 | depends on OLPC && ACPI |
2115 | select POWER_SUPPLY | |
a0f30f59 DD |
2116 | ---help--- |
2117 | Add support for SCI-based features of the OLPC XO-1.5 laptop: | |
2118 | - EC-driven system wakeups | |
2119 | - AC adapter status updates | |
2120 | - Battery status updates | |
bf1ebf00 | 2121 | |
d4f3e350 EW |
2122 | config ALIX |
2123 | bool "PCEngines ALIX System Support (LED setup)" | |
2124 | select GPIOLIB | |
2125 | ---help--- | |
2126 | This option enables system support for the PCEngines ALIX. | |
2127 | At present this just sets up LEDs for GPIO control on | |
2128 | ALIX2/3/6 boards. However, other system specific setup should | |
2129 | get added here. | |
2130 | ||
2131 | Note: You must still enable the drivers for GPIO and LED support | |
2132 | (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs | |
2133 | ||
2134 | Note: You have to set alix.force=1 for boards with Award BIOS. | |
2135 | ||
bc0120fd SR |
2136 | endif # X86_32 |
2137 | ||
23ac4ae8 | 2138 | config AMD_NB |
e279b6c1 | 2139 | def_bool y |
0e152cd7 | 2140 | depends on CPU_SUP_AMD && PCI |
e279b6c1 SR |
2141 | |
2142 | source "drivers/pcmcia/Kconfig" | |
2143 | ||
2144 | source "drivers/pci/hotplug/Kconfig" | |
2145 | ||
388b78ad AB |
2146 | config RAPIDIO |
2147 | bool "RapidIO support" | |
2148 | depends on PCI | |
2149 | default n | |
2150 | help | |
2151 | If you say Y here, the kernel will include drivers and | |
2152 | infrastructure code to support RapidIO interconnect devices. | |
2153 | ||
2154 | source "drivers/rapidio/Kconfig" | |
2155 | ||
e279b6c1 SR |
2156 | endmenu |
2157 | ||
2158 | ||
2159 | menu "Executable file formats / Emulations" | |
2160 | ||
2161 | source "fs/Kconfig.binfmt" | |
2162 | ||
2163 | config IA32_EMULATION | |
2164 | bool "IA32 Emulation" | |
2165 | depends on X86_64 | |
a97f52e6 | 2166 | select COMPAT_BINFMT_ELF |
8f9ca475 | 2167 | ---help--- |
e279b6c1 SR |
2168 | Include code to run 32-bit programs under a 64-bit kernel. You should |
2169 | likely turn this on, unless you're 100% sure that you don't have any | |
2170 | 32-bit programs left. | |
2171 | ||
2172 | config IA32_AOUT | |
8f9ca475 IM |
2173 | tristate "IA32 a.out support" |
2174 | depends on IA32_EMULATION | |
2175 | ---help--- | |
2176 | Support old a.out binaries in the 32bit emulation. | |
e279b6c1 SR |
2177 | |
2178 | config COMPAT | |
3c2362e6 | 2179 | def_bool y |
e279b6c1 | 2180 | depends on IA32_EMULATION |
e279b6c1 SR |
2181 | |
2182 | config COMPAT_FOR_U64_ALIGNMENT | |
2183 | def_bool COMPAT | |
2184 | depends on X86_64 | |
2185 | ||
2186 | config SYSVIPC_COMPAT | |
3c2362e6 | 2187 | def_bool y |
b8992195 | 2188 | depends on COMPAT && SYSVIPC |
e279b6c1 | 2189 | |
ee009e4a DH |
2190 | config KEYS_COMPAT |
2191 | bool | |
2192 | depends on COMPAT && KEYS | |
2193 | default y | |
2194 | ||
e279b6c1 SR |
2195 | endmenu |
2196 | ||
2197 | ||
e5beae16 KP |
2198 | config HAVE_ATOMIC_IOMAP |
2199 | def_bool y | |
2200 | depends on X86_32 | |
2201 | ||
3cba11d3 MH |
2202 | config HAVE_TEXT_POKE_SMP |
2203 | bool | |
2204 | select STOP_MACHINE if SMP | |
2205 | ||
e279b6c1 SR |
2206 | source "net/Kconfig" |
2207 | ||
2208 | source "drivers/Kconfig" | |
2209 | ||
2210 | source "drivers/firmware/Kconfig" | |
2211 | ||
2212 | source "fs/Kconfig" | |
2213 | ||
e279b6c1 SR |
2214 | source "arch/x86/Kconfig.debug" |
2215 | ||
2216 | source "security/Kconfig" | |
2217 | ||
2218 | source "crypto/Kconfig" | |
2219 | ||
edf88417 AK |
2220 | source "arch/x86/kvm/Kconfig" |
2221 | ||
e279b6c1 | 2222 | source "lib/Kconfig" |