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Commit | Line | Data |
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1032c0ba | 1 | # x86 configuration |
daa93fab SR |
2 | mainmenu "Linux Kernel Configuration for x86" |
3 | ||
4 | # Select 32 or 64 bit | |
5 | config 64BIT | |
6840999b SR |
6 | bool "64-bit kernel" if ARCH = "x86" |
7 | default ARCH = "x86_64" | |
8f9ca475 | 8 | ---help--- |
daa93fab SR |
9 | Say yes to build a 64-bit kernel - formerly known as x86_64 |
10 | Say no to build a 32-bit kernel - formerly known as i386 | |
11 | ||
12 | config X86_32 | |
13 | def_bool !64BIT | |
14 | ||
15 | config X86_64 | |
16 | def_bool 64BIT | |
1032c0ba SR |
17 | |
18 | ### Arch settings | |
8d5fffb9 | 19 | config X86 |
3c2362e6 | 20 | def_bool y |
e17c6d56 | 21 | select HAVE_AOUT if X86_32 |
2c5643b1 HM |
22 | select HAVE_READQ |
23 | select HAVE_WRITEQ | |
a5574cf6 | 24 | select HAVE_UNSTABLE_SCHED_CLOCK |
ec7748b5 | 25 | select HAVE_IDE |
42d4b839 | 26 | select HAVE_OPROFILE |
cdd6c482 | 27 | select HAVE_PERF_EVENTS if (!M386 && !M486) |
e360adbe | 28 | select HAVE_IRQ_WORK |
28b2ee20 | 29 | select HAVE_IOREMAP_PROT |
3f550096 | 30 | select HAVE_KPROBES |
72d7c3b3 | 31 | select HAVE_MEMBLOCK |
1f972768 | 32 | select ARCH_WANT_OPTIONAL_GPIOLIB |
da4276b8 | 33 | select ARCH_WANT_FRAME_POINTERS |
7c095e46 | 34 | select HAVE_DMA_ATTRS |
9edddaa2 | 35 | select HAVE_KRETPROBES |
c0f7ac3a | 36 | select HAVE_OPTPROBES |
e4b2b886 | 37 | select HAVE_FTRACE_MCOUNT_RECORD |
cf4db259 | 38 | select HAVE_C_RECORDMCOUNT |
677aa9f7 | 39 | select HAVE_DYNAMIC_FTRACE |
606576ce | 40 | select HAVE_FUNCTION_TRACER |
48d68b20 | 41 | select HAVE_FUNCTION_GRAPH_TRACER |
71e308a2 | 42 | select HAVE_FUNCTION_GRAPH_FP_TEST |
60a7ecf4 | 43 | select HAVE_FUNCTION_TRACE_MCOUNT_TEST |
9a5fd902 | 44 | select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE |
66700001 | 45 | select HAVE_SYSCALL_TRACEPOINTS |
e0ec9483 | 46 | select HAVE_KVM |
49793b03 | 47 | select HAVE_ARCH_KGDB |
99bbc4b1 | 48 | select HAVE_ARCH_TRACEHOOK |
323ec001 | 49 | select HAVE_GENERIC_DMA_COHERENT if X86_32 |
58340a07 | 50 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
8d26487f | 51 | select USER_STACKTRACE_SUPPORT |
f850c30c | 52 | select HAVE_REGS_AND_STACK_ACCESS_API |
2118d0c5 | 53 | select HAVE_DMA_API_DEBUG |
2e9f3bdd PA |
54 | select HAVE_KERNEL_GZIP |
55 | select HAVE_KERNEL_BZIP2 | |
56 | select HAVE_KERNEL_LZMA | |
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 |
0a4af3b0 | 63 | select HAVE_ARCH_KMEMCHECK |
7c68af6e | 64 | select HAVE_USER_RETURN_NOTIFIER |
46eb3b64 | 65 | select HAVE_ARCH_JUMP_LABEL |
3cba11d3 | 66 | select HAVE_TEXT_POKE_SMP |
3bb9808e TG |
67 | select HAVE_GENERIC_HARDIRQS |
68 | select HAVE_SPARSE_IRQ | |
3bb9808e TG |
69 | select GENERIC_IRQ_PROBE |
70 | select GENERIC_PENDING_IRQ if SMP | |
7d8330a5 | 71 | |
ba7e4d13 IM |
72 | config INSTRUCTION_DECODER |
73 | def_bool (KPROBES || PERF_EVENTS) | |
74 | ||
51b26ada LT |
75 | config OUTPUT_FORMAT |
76 | string | |
77 | default "elf32-i386" if X86_32 | |
78 | default "elf64-x86-64" if X86_64 | |
79 | ||
73531905 | 80 | config ARCH_DEFCONFIG |
b9b39bfb | 81 | string |
73531905 SR |
82 | default "arch/x86/configs/i386_defconfig" if X86_32 |
83 | default "arch/x86/configs/x86_64_defconfig" if X86_64 | |
b9b39bfb | 84 | |
8d5fffb9 | 85 | config GENERIC_CMOS_UPDATE |
3c2362e6 | 86 | def_bool y |
8d5fffb9 SR |
87 | |
88 | config CLOCKSOURCE_WATCHDOG | |
3c2362e6 | 89 | def_bool y |
8d5fffb9 SR |
90 | |
91 | config GENERIC_CLOCKEVENTS | |
3c2362e6 | 92 | def_bool y |
8d5fffb9 SR |
93 | |
94 | config GENERIC_CLOCKEVENTS_BROADCAST | |
3c2362e6 | 95 | def_bool y |
8d5fffb9 SR |
96 | depends on X86_64 || (X86_32 && X86_LOCAL_APIC) |
97 | ||
98 | config LOCKDEP_SUPPORT | |
3c2362e6 | 99 | def_bool y |
8d5fffb9 SR |
100 | |
101 | config STACKTRACE_SUPPORT | |
3c2362e6 | 102 | def_bool y |
8d5fffb9 | 103 | |
aa7d9350 HC |
104 | config HAVE_LATENCYTOP_SUPPORT |
105 | def_bool y | |
106 | ||
8d5fffb9 | 107 | config MMU |
3c2362e6 | 108 | def_bool y |
8d5fffb9 SR |
109 | |
110 | config ZONE_DMA | |
3c2362e6 | 111 | def_bool y |
8d5fffb9 | 112 | |
8d5fffb9 SR |
113 | config SBUS |
114 | bool | |
115 | ||
3bc4e459 FT |
116 | config NEED_DMA_MAP_STATE |
117 | def_bool (X86_64 || DMAR || DMA_API_DEBUG) | |
118 | ||
18e98307 | 119 | config NEED_SG_DMA_LENGTH |
4a14d84e | 120 | def_bool y |
18e98307 | 121 | |
8d5fffb9 | 122 | config GENERIC_ISA_DMA |
3c2362e6 | 123 | def_bool y |
8d5fffb9 SR |
124 | |
125 | config GENERIC_IOMAP | |
3c2362e6 | 126 | def_bool y |
8d5fffb9 SR |
127 | |
128 | config GENERIC_BUG | |
3c2362e6 | 129 | def_bool y |
8d5fffb9 | 130 | depends on BUG |
b93a531e JB |
131 | select GENERIC_BUG_RELATIVE_POINTERS if X86_64 |
132 | ||
133 | config GENERIC_BUG_RELATIVE_POINTERS | |
134 | bool | |
8d5fffb9 SR |
135 | |
136 | config GENERIC_HWEIGHT | |
3c2362e6 | 137 | def_bool y |
8d5fffb9 | 138 | |
a6082959 | 139 | config GENERIC_GPIO |
9ba16087 | 140 | bool |
a6082959 | 141 | |
8d5fffb9 | 142 | config ARCH_MAY_HAVE_PC_FDC |
3c2362e6 | 143 | def_bool y |
8d5fffb9 | 144 | |
1032c0ba SR |
145 | config RWSEM_GENERIC_SPINLOCK |
146 | def_bool !X86_XADD | |
147 | ||
148 | config RWSEM_XCHGADD_ALGORITHM | |
149 | def_bool X86_XADD | |
150 | ||
a6869cc4 VP |
151 | config ARCH_HAS_CPU_IDLE_WAIT |
152 | def_bool y | |
153 | ||
1032c0ba SR |
154 | config GENERIC_CALIBRATE_DELAY |
155 | def_bool y | |
156 | ||
8d5fffb9 SR |
157 | config GENERIC_TIME_VSYSCALL |
158 | bool | |
159 | default X86_64 | |
160 | ||
9a0b8415 | 161 | config ARCH_HAS_CPU_RELAX |
162 | def_bool y | |
163 | ||
89cedfef VP |
164 | config ARCH_HAS_DEFAULT_IDLE |
165 | def_bool y | |
166 | ||
1b27d05b PE |
167 | config ARCH_HAS_CACHE_LINE_SIZE |
168 | def_bool y | |
169 | ||
dd5af90a | 170 | config HAVE_SETUP_PER_CPU_AREA |
89c9c4c5 | 171 | def_bool y |
b32ef636 | 172 | |
08fc4580 TH |
173 | config NEED_PER_CPU_EMBED_FIRST_CHUNK |
174 | def_bool y | |
175 | ||
176 | config NEED_PER_CPU_PAGE_FIRST_CHUNK | |
11124411 TH |
177 | def_bool y |
178 | ||
9f0e8d04 MT |
179 | config HAVE_CPUMASK_OF_CPU_MAP |
180 | def_bool X86_64_SMP | |
181 | ||
801e4062 JB |
182 | config ARCH_HIBERNATION_POSSIBLE |
183 | def_bool y | |
801e4062 | 184 | |
f4cb5700 JB |
185 | config ARCH_SUSPEND_POSSIBLE |
186 | def_bool y | |
f4cb5700 | 187 | |
8d5fffb9 SR |
188 | config ZONE_DMA32 |
189 | bool | |
190 | default X86_64 | |
191 | ||
192 | config ARCH_POPULATES_NODE_MAP | |
193 | def_bool y | |
194 | ||
195 | config AUDIT_ARCH | |
196 | bool | |
197 | default X86_64 | |
198 | ||
765c68bd IM |
199 | config ARCH_SUPPORTS_OPTIMIZED_INLINING |
200 | def_bool y | |
201 | ||
6a11f75b AM |
202 | config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
203 | def_bool y | |
204 | ||
69575d38 SW |
205 | config HAVE_INTEL_TXT |
206 | def_bool y | |
207 | depends on EXPERIMENTAL && DMAR && ACPI | |
208 | ||
6cd10f8d JB |
209 | config USE_GENERIC_SMP_HELPERS |
210 | def_bool y | |
211 | depends on SMP | |
212 | ||
6b0c3d44 SR |
213 | config X86_32_SMP |
214 | def_bool y | |
215 | depends on X86_32 && SMP | |
216 | ||
217 | config X86_64_SMP | |
218 | def_bool y | |
219 | depends on X86_64 && SMP | |
220 | ||
8d5fffb9 | 221 | config X86_HT |
6fc108a0 | 222 | def_bool y |
ee0011a7 | 223 | depends on SMP |
8d5fffb9 SR |
224 | |
225 | config X86_TRAMPOLINE | |
6fc108a0 | 226 | def_bool y |
3e5095d1 | 227 | depends on SMP || (64BIT && ACPI_SLEEP) |
8d5fffb9 | 228 | |
ccbeed3a TH |
229 | config X86_32_LAZY_GS |
230 | def_bool y | |
60a5317f | 231 | depends on X86_32 && !CC_STACKPROTECTOR |
ccbeed3a | 232 | |
d61931d8 BP |
233 | config ARCH_HWEIGHT_CFLAGS |
234 | string | |
235 | default "-fcall-saved-ecx -fcall-saved-edx" if X86_32 | |
236 | 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 | |
237 | ||
8d5fffb9 SR |
238 | config KTIME_SCALAR |
239 | def_bool X86_32 | |
d7c53c9e BP |
240 | |
241 | config ARCH_CPU_PROBE_RELEASE | |
242 | def_bool y | |
243 | depends on HOTPLUG_CPU | |
244 | ||
506f1d07 | 245 | source "init/Kconfig" |
dc52ddc0 | 246 | source "kernel/Kconfig.freezer" |
8d5fffb9 | 247 | |
506f1d07 SR |
248 | menu "Processor type and features" |
249 | ||
250 | source "kernel/time/Kconfig" | |
251 | ||
252 | config SMP | |
253 | bool "Symmetric multi-processing support" | |
254 | ---help--- | |
255 | This enables support for systems with more than one CPU. If you have | |
256 | a system with only one CPU, like most personal computers, say N. If | |
257 | you have a system with more than one CPU, say Y. | |
258 | ||
259 | If you say N here, the kernel will run on single and multiprocessor | |
260 | machines, but will use only one CPU of a multiprocessor machine. If | |
261 | you say Y here, the kernel will run on many, but not all, | |
262 | singleprocessor machines. On a singleprocessor machine, the kernel | |
263 | will run faster if you say N here. | |
264 | ||
265 | Note that if you say Y here and choose architecture "586" or | |
266 | "Pentium" under "Processor family", the kernel will not work on 486 | |
267 | architectures. Similarly, multiprocessor kernels for the "PPro" | |
268 | architecture may not work on all Pentium based boards. | |
269 | ||
270 | People using multiprocessor machines who say Y here should also say | |
271 | Y to "Enhanced Real Time Clock Support", below. The "Advanced Power | |
272 | Management" code will be disabled if you say Y here. | |
273 | ||
03502faa | 274 | See also <file:Documentation/i386/IO-APIC.txt>, |
506f1d07 SR |
275 | <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at |
276 | <http://www.tldp.org/docs.html#howto>. | |
277 | ||
278 | If you don't know what to do here, say N. | |
279 | ||
06cd9a7d YL |
280 | config X86_X2APIC |
281 | bool "Support x2apic" | |
f7d7f866 | 282 | depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP |
06cd9a7d YL |
283 | ---help--- |
284 | This enables x2apic support on CPUs that have this feature. | |
285 | ||
286 | This allows 32-bit apic IDs (so it can support very large systems), | |
287 | and accesses the local apic via MSRs not via mmio. | |
288 | ||
06cd9a7d YL |
289 | If you don't know what to do here, say N. |
290 | ||
6695c85b | 291 | config X86_MPPARSE |
7a527688 JB |
292 | bool "Enable MPS table" if ACPI |
293 | default y | |
5ab74722 | 294 | depends on X86_LOCAL_APIC |
8f9ca475 | 295 | ---help--- |
6695c85b YL |
296 | For old smp systems that do not have proper acpi support. Newer systems |
297 | (esp with 64bit cpus) with acpi support, MADT and DSDT will override it | |
6695c85b | 298 | |
26f7ef14 YL |
299 | config X86_BIGSMP |
300 | bool "Support for big SMP systems with more than 8 CPUs" | |
301 | depends on X86_32 && SMP | |
8f9ca475 | 302 | ---help--- |
26f7ef14 | 303 | This option is needed for the systems that have more than 8 CPUs |
506f1d07 | 304 | |
8425091f | 305 | if X86_32 |
c5c606d9 RT |
306 | config X86_EXTENDED_PLATFORM |
307 | bool "Support for extended (non-PC) x86 platforms" | |
308 | default y | |
8f9ca475 | 309 | ---help--- |
06ac8346 IM |
310 | If you disable this option then the kernel will only support |
311 | standard PC platforms. (which covers the vast majority of | |
312 | systems out there.) | |
313 | ||
8425091f RT |
314 | If you enable this option then you'll be able to select support |
315 | for the following (non-PC) 32 bit x86 platforms: | |
316 | AMD Elan | |
317 | NUMAQ (IBM/Sequent) | |
318 | RDC R-321x SoC | |
319 | SGI 320/540 (Visual Workstation) | |
320 | Summit/EXA (IBM x440) | |
321 | Unisys ES7000 IA32 series | |
3f4110a4 | 322 | Moorestown MID devices |
06ac8346 IM |
323 | |
324 | If you have one of these systems, or if you want to build a | |
325 | generic distribution kernel, say Y here - otherwise say N. | |
8425091f | 326 | endif |
06ac8346 | 327 | |
8425091f RT |
328 | if X86_64 |
329 | config X86_EXTENDED_PLATFORM | |
330 | bool "Support for extended (non-PC) x86 platforms" | |
331 | default y | |
332 | ---help--- | |
333 | If you disable this option then the kernel will only support | |
334 | standard PC platforms. (which covers the vast majority of | |
335 | systems out there.) | |
336 | ||
337 | If you enable this option then you'll be able to select support | |
338 | for the following (non-PC) 64 bit x86 platforms: | |
339 | ScaleMP vSMP | |
340 | SGI Ultraviolet | |
341 | ||
342 | If you have one of these systems, or if you want to build a | |
343 | generic distribution kernel, say Y here - otherwise say N. | |
344 | endif | |
c5c606d9 RT |
345 | # This is an alphabetically sorted list of 64 bit extended platforms |
346 | # Please maintain the alphabetic order if and when there are additions | |
506f1d07 | 347 | |
c5c606d9 RT |
348 | config X86_VSMP |
349 | bool "ScaleMP vSMP" | |
03f1a17c | 350 | select PARAVIRT_GUEST |
c5c606d9 RT |
351 | select PARAVIRT |
352 | depends on X86_64 && PCI | |
353 | depends on X86_EXTENDED_PLATFORM | |
8f9ca475 | 354 | ---help--- |
c5c606d9 RT |
355 | Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is |
356 | supposed to run on these EM64T-based machines. Only choose this option | |
357 | if you have one of these machines. | |
5e3a77e9 | 358 | |
03b48632 NP |
359 | config X86_UV |
360 | bool "SGI Ultraviolet" | |
361 | depends on X86_64 | |
c5c606d9 | 362 | depends on X86_EXTENDED_PLATFORM |
54c28d29 | 363 | depends on NUMA |
9d6c26e7 | 364 | depends on X86_X2APIC |
8f9ca475 | 365 | ---help--- |
03b48632 NP |
366 | This option is needed in order to support SGI Ultraviolet systems. |
367 | If you don't have one of these, you should say N here. | |
368 | ||
c5c606d9 RT |
369 | # Following is an alphabetically sorted list of 32 bit extended platforms |
370 | # Please maintain the alphabetic order if and when there are additions | |
506f1d07 SR |
371 | |
372 | config X86_ELAN | |
373 | bool "AMD Elan" | |
374 | depends on X86_32 | |
c5c606d9 | 375 | depends on X86_EXTENDED_PLATFORM |
8f9ca475 | 376 | ---help--- |
506f1d07 SR |
377 | Select this for an AMD Elan processor. |
378 | ||
379 | Do not use this option for K6/Athlon/Opteron processors! | |
380 | ||
381 | If unsure, choose "PC-compatible" instead. | |
382 | ||
3f4110a4 TG |
383 | config X86_MRST |
384 | bool "Moorestown MID platform" | |
4b2f3f7d JP |
385 | depends on PCI |
386 | depends on PCI_GOANY | |
3f4110a4 TG |
387 | depends on X86_32 |
388 | depends on X86_EXTENDED_PLATFORM | |
4b2f3f7d | 389 | depends on X86_IO_APIC |
bb24c471 | 390 | select APB_TIMER |
3f4110a4 TG |
391 | ---help--- |
392 | Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin | |
393 | Internet Device(MID) platform. Moorestown consists of two chips: | |
394 | Lincroft (CPU core, graphics, and memory controller) and Langwell IOH. | |
395 | Unlike standard x86 PCs, Moorestown does not have many legacy devices | |
396 | nor standard legacy replacement devices/features. e.g. Moorestown does | |
397 | not contain i8259, i8254, HPET, legacy BIOS, most of the io ports. | |
398 | ||
c5c606d9 RT |
399 | config X86_RDC321X |
400 | bool "RDC R-321x SoC" | |
506f1d07 | 401 | depends on X86_32 |
c5c606d9 RT |
402 | depends on X86_EXTENDED_PLATFORM |
403 | select M486 | |
404 | select X86_REBOOTFIXUPS | |
405 | ---help--- | |
406 | This option is needed for RDC R-321x system-on-chip, also known | |
407 | as R-8610-(G). | |
408 | If you don't have one of these chips, you should say N here. | |
409 | ||
e0c7ae37 | 410 | config X86_32_NON_STANDARD |
9c398017 IM |
411 | bool "Support non-standard 32-bit SMP architectures" |
412 | depends on X86_32 && SMP | |
c5c606d9 | 413 | depends on X86_EXTENDED_PLATFORM |
8f9ca475 IM |
414 | ---help--- |
415 | This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default | |
d49c4288 YL |
416 | subarchitectures. It is intended for a generic binary kernel. |
417 | if you select them all, kernel will probe it one by one. and will | |
418 | fallback to default. | |
419 | ||
c5c606d9 | 420 | # Alphabetically sorted list of Non standard 32 bit platforms |
d49c4288 | 421 | |
506f1d07 SR |
422 | config X86_NUMAQ |
423 | bool "NUMAQ (IBM/Sequent)" | |
e0c7ae37 | 424 | depends on X86_32_NON_STANDARD |
a92d152e | 425 | depends on PCI |
506f1d07 | 426 | select NUMA |
9c398017 | 427 | select X86_MPPARSE |
8f9ca475 | 428 | ---help--- |
d49c4288 YL |
429 | This option is used for getting Linux to run on a NUMAQ (IBM/Sequent) |
430 | NUMA multiquad box. This changes the way that processors are | |
431 | bootstrapped, and uses Clustered Logical APIC addressing mode instead | |
432 | of Flat Logical. You will need a new lynxer.elf file to flash your | |
433 | firmware with - send email to <Martin.Bligh@us.ibm.com>. | |
506f1d07 | 434 | |
d949f36f | 435 | config X86_SUPPORTS_MEMORY_FAILURE |
6fc108a0 | 436 | def_bool y |
d949f36f LT |
437 | # MCE code calls memory_failure(): |
438 | depends on X86_MCE | |
439 | # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags: | |
440 | depends on !X86_NUMAQ | |
441 | # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH: | |
442 | depends on X86_64 || !SPARSEMEM | |
443 | select ARCH_SUPPORTS_MEMORY_FAILURE | |
d949f36f | 444 | |
1b84e1c8 IM |
445 | config X86_VISWS |
446 | bool "SGI 320/540 (Visual Workstation)" | |
c5c606d9 RT |
447 | depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT |
448 | depends on X86_32_NON_STANDARD | |
449 | ---help--- | |
1b84e1c8 IM |
450 | The SGI Visual Workstation series is an IA32-based workstation |
451 | based on SGI systems chips with some legacy PC hardware attached. | |
452 | ||
453 | Say Y here to create a kernel to run on the SGI 320 or 540. | |
454 | ||
455 | A kernel compiled for the Visual Workstation will run on general | |
456 | PCs as well. See <file:Documentation/sgi-visws.txt> for details. | |
457 | ||
9c398017 IM |
458 | config X86_SUMMIT |
459 | bool "Summit/EXA (IBM x440)" | |
e0c7ae37 | 460 | depends on X86_32_NON_STANDARD |
8f9ca475 | 461 | ---help--- |
9c398017 IM |
462 | This option is needed for IBM systems that use the Summit/EXA chipset. |
463 | In particular, it is needed for the x440. | |
1f972768 | 464 | |
9c398017 | 465 | config X86_ES7000 |
c5c606d9 | 466 | bool "Unisys ES7000 IA32 series" |
26f7ef14 | 467 | depends on X86_32_NON_STANDARD && X86_BIGSMP |
8f9ca475 | 468 | ---help--- |
9c398017 IM |
469 | Support for Unisys ES7000 systems. Say 'Y' here if this kernel is |
470 | supposed to run on an IA32-based Unisys ES7000 system. | |
471 | ||
ae1e9130 | 472 | config SCHED_OMIT_FRAME_POINTER |
3c2362e6 HH |
473 | def_bool y |
474 | prompt "Single-depth WCHAN output" | |
a87d0914 | 475 | depends on X86 |
8f9ca475 | 476 | ---help--- |
506f1d07 SR |
477 | Calculate simpler /proc/<PID>/wchan values. If this option |
478 | is disabled then wchan values will recurse back to the | |
479 | caller function. This provides more accurate wchan values, | |
480 | at the expense of slightly more scheduling overhead. | |
481 | ||
482 | If in doubt, say "Y". | |
483 | ||
506f1d07 SR |
484 | menuconfig PARAVIRT_GUEST |
485 | bool "Paravirtualized guest support" | |
8f9ca475 | 486 | ---help--- |
506f1d07 SR |
487 | Say Y here to get to see options related to running Linux under |
488 | various hypervisors. This option alone does not add any kernel code. | |
489 | ||
490 | If you say N, all options in this submenu will be skipped and disabled. | |
491 | ||
492 | if PARAVIRT_GUEST | |
493 | ||
494 | source "arch/x86/xen/Kconfig" | |
495 | ||
790c73f6 GOC |
496 | config KVM_CLOCK |
497 | bool "KVM paravirtualized clock" | |
498 | select PARAVIRT | |
f6e16d5a | 499 | select PARAVIRT_CLOCK |
8f9ca475 | 500 | ---help--- |
790c73f6 GOC |
501 | Turning on this option will allow you to run a paravirtualized clock |
502 | when running over the KVM hypervisor. Instead of relying on a PIT | |
503 | (or probably other) emulation by the underlying device model, the host | |
504 | provides the guest with timing infrastructure such as time of day, and | |
505 | system time | |
506 | ||
0cf1bfd2 MT |
507 | config KVM_GUEST |
508 | bool "KVM Guest support" | |
509 | select PARAVIRT | |
8f9ca475 IM |
510 | ---help--- |
511 | This option enables various optimizations for running under the KVM | |
512 | hypervisor. | |
0cf1bfd2 | 513 | |
506f1d07 SR |
514 | source "arch/x86/lguest/Kconfig" |
515 | ||
e61bd94a EPH |
516 | config PARAVIRT |
517 | bool "Enable paravirtualization code" | |
8f9ca475 | 518 | ---help--- |
e61bd94a EPH |
519 | This changes the kernel so it can modify itself when it is run |
520 | under a hypervisor, potentially improving performance significantly | |
521 | over full virtualization. However, when run without a hypervisor | |
522 | the kernel is theoretically slower and slightly larger. | |
523 | ||
b4ecc126 JF |
524 | config PARAVIRT_SPINLOCKS |
525 | bool "Paravirtualization layer for spinlocks" | |
526 | depends on PARAVIRT && SMP && EXPERIMENTAL | |
527 | ---help--- | |
528 | Paravirtualized spinlocks allow a pvops backend to replace the | |
529 | spinlock implementation with something virtualization-friendly | |
530 | (for example, block the virtual CPU rather than spinning). | |
531 | ||
532 | Unfortunately the downside is an up to 5% performance hit on | |
533 | native kernels, with various workloads. | |
534 | ||
535 | If you are unsure how to answer this question, answer N. | |
536 | ||
7af192c9 GH |
537 | config PARAVIRT_CLOCK |
538 | bool | |
7af192c9 | 539 | |
506f1d07 SR |
540 | endif |
541 | ||
97349135 | 542 | config PARAVIRT_DEBUG |
8f9ca475 IM |
543 | bool "paravirt-ops debugging" |
544 | depends on PARAVIRT && DEBUG_KERNEL | |
545 | ---help--- | |
546 | Enable to debug paravirt_ops internals. Specifically, BUG if | |
547 | a paravirt_op is missing when it is called. | |
97349135 | 548 | |
08677214 | 549 | config NO_BOOTMEM |
774ea0bc | 550 | def_bool y |
08677214 | 551 | |
03273184 YL |
552 | config MEMTEST |
553 | bool "Memtest" | |
8f9ca475 | 554 | ---help--- |
c64df707 | 555 | This option adds a kernel parameter 'memtest', which allows memtest |
03273184 | 556 | to be set. |
8f9ca475 IM |
557 | memtest=0, mean disabled; -- default |
558 | memtest=1, mean do 1 test pattern; | |
559 | ... | |
560 | memtest=4, mean do 4 test patterns. | |
aba3728c | 561 | If you are unsure how to answer this question, answer N. |
506f1d07 SR |
562 | |
563 | config X86_SUMMIT_NUMA | |
3c2362e6 | 564 | def_bool y |
e0c7ae37 | 565 | depends on X86_32 && NUMA && X86_32_NON_STANDARD |
506f1d07 SR |
566 | |
567 | config X86_CYCLONE_TIMER | |
3c2362e6 | 568 | def_bool y |
e0c7ae37 | 569 | depends on X86_32_NON_STANDARD |
506f1d07 | 570 | |
506f1d07 SR |
571 | source "arch/x86/Kconfig.cpu" |
572 | ||
573 | config HPET_TIMER | |
3c2362e6 | 574 | def_bool X86_64 |
506f1d07 | 575 | prompt "HPET Timer Support" if X86_32 |
8f9ca475 IM |
576 | ---help--- |
577 | Use the IA-PC HPET (High Precision Event Timer) to manage | |
578 | time in preference to the PIT and RTC, if a HPET is | |
579 | present. | |
580 | HPET is the next generation timer replacing legacy 8254s. | |
581 | The HPET provides a stable time base on SMP | |
582 | systems, unlike the TSC, but it is more expensive to access, | |
583 | as it is off-chip. You can find the HPET spec at | |
584 | <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>. | |
506f1d07 | 585 | |
8f9ca475 IM |
586 | You can safely choose Y here. However, HPET will only be |
587 | activated if the platform and the BIOS support this feature. | |
588 | Otherwise the 8254 will be used for timing services. | |
506f1d07 | 589 | |
8f9ca475 | 590 | Choose N to continue using the legacy 8254 timer. |
506f1d07 SR |
591 | |
592 | config HPET_EMULATE_RTC | |
3c2362e6 | 593 | def_bool y |
9d8af78b | 594 | depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) |
506f1d07 | 595 | |
bb24c471 JP |
596 | config APB_TIMER |
597 | def_bool y if MRST | |
598 | prompt "Langwell APB Timer Support" if X86_MRST | |
599 | help | |
600 | APB timer is the replacement for 8254, HPET on X86 MID platforms. | |
601 | The APBT provides a stable time base on SMP | |
602 | systems, unlike the TSC, but it is more expensive to access, | |
603 | as it is off-chip. APB timers are always running regardless of CPU | |
604 | C states, they are used as per CPU clockevent device when possible. | |
605 | ||
506f1d07 SR |
606 | # Mark as embedded because too many people got it wrong. |
607 | # The code disables itself when not needed. | |
7ae9392c TP |
608 | config DMI |
609 | default y | |
610 | bool "Enable DMI scanning" if EMBEDDED | |
8f9ca475 | 611 | ---help--- |
7ae9392c TP |
612 | Enabled scanning of DMI to identify machine quirks. Say Y |
613 | here unless you have verified that your setup is not | |
614 | affected by entries in the DMI blacklist. Required by PNP | |
615 | BIOS code. | |
616 | ||
506f1d07 SR |
617 | config GART_IOMMU |
618 | bool "GART IOMMU support" if EMBEDDED | |
619 | default y | |
620 | select SWIOTLB | |
23ac4ae8 | 621 | depends on X86_64 && PCI && AMD_NB |
8f9ca475 | 622 | ---help--- |
506f1d07 SR |
623 | Support for full DMA access of devices with 32bit memory access only |
624 | on systems with more than 3GB. This is usually needed for USB, | |
625 | sound, many IDE/SATA chipsets and some other devices. | |
626 | Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART | |
627 | based hardware IOMMU and a software bounce buffer based IOMMU used | |
628 | on Intel systems and as fallback. | |
629 | The code is only active when needed (enough memory and limited | |
630 | device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified | |
631 | too. | |
632 | ||
633 | config CALGARY_IOMMU | |
634 | bool "IBM Calgary IOMMU support" | |
635 | select SWIOTLB | |
636 | depends on X86_64 && PCI && EXPERIMENTAL | |
8f9ca475 | 637 | ---help--- |
506f1d07 SR |
638 | Support for hardware IOMMUs in IBM's xSeries x366 and x460 |
639 | systems. Needed to run systems with more than 3GB of memory | |
640 | properly with 32-bit PCI devices that do not support DAC | |
641 | (Double Address Cycle). Calgary also supports bus level | |
642 | isolation, where all DMAs pass through the IOMMU. This | |
643 | prevents them from going anywhere except their intended | |
644 | destination. This catches hard-to-find kernel bugs and | |
645 | mis-behaving drivers and devices that do not use the DMA-API | |
646 | properly to set up their DMA buffers. The IOMMU can be | |
647 | turned off at boot time with the iommu=off parameter. | |
648 | Normally the kernel will make the right choice by itself. | |
649 | If unsure, say Y. | |
650 | ||
651 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT | |
3c2362e6 HH |
652 | def_bool y |
653 | prompt "Should Calgary be enabled by default?" | |
506f1d07 | 654 | depends on CALGARY_IOMMU |
8f9ca475 | 655 | ---help--- |
506f1d07 SR |
656 | Should Calgary be enabled by default? if you choose 'y', Calgary |
657 | will be used (if it exists). If you choose 'n', Calgary will not be | |
658 | used even if it exists. If you choose 'n' and would like to use | |
659 | Calgary anyway, pass 'iommu=calgary' on the kernel command line. | |
660 | If unsure, say Y. | |
661 | ||
2b188723 JR |
662 | config AMD_IOMMU |
663 | bool "AMD IOMMU support" | |
07c40e8a | 664 | select SWIOTLB |
a80dc3e0 | 665 | select PCI_MSI |
24d2ba0a | 666 | depends on X86_64 && PCI && ACPI |
8f9ca475 | 667 | ---help--- |
18d22200 JR |
668 | With this option you can enable support for AMD IOMMU hardware in |
669 | your system. An IOMMU is a hardware component which provides | |
670 | remapping of DMA memory accesses from devices. With an AMD IOMMU you | |
671 | can isolate the the DMA memory of different devices and protect the | |
672 | system from misbehaving device drivers or hardware. | |
673 | ||
674 | You can find out if your system has an AMD IOMMU if you look into | |
675 | your BIOS for an option to enable it or if you have an IVRS ACPI | |
676 | table. | |
2b188723 | 677 | |
2e117604 JR |
678 | config AMD_IOMMU_STATS |
679 | bool "Export AMD IOMMU statistics to debugfs" | |
680 | depends on AMD_IOMMU | |
681 | select DEBUG_FS | |
8f9ca475 | 682 | ---help--- |
2e117604 JR |
683 | This option enables code in the AMD IOMMU driver to collect various |
684 | statistics about whats happening in the driver and exports that | |
685 | information to userspace via debugfs. | |
686 | If unsure, say N. | |
687 | ||
506f1d07 SR |
688 | # need this always selected by IOMMU for the VIA workaround |
689 | config SWIOTLB | |
a1afd01c | 690 | def_bool y if X86_64 |
8f9ca475 | 691 | ---help--- |
506f1d07 SR |
692 | Support for software bounce buffers used on x86-64 systems |
693 | which don't have a hardware IOMMU (e.g. the current generation | |
694 | of Intel's x86-64 CPUs). Using this PCI devices which can only | |
695 | access 32-bits of memory can be used on systems with more than | |
696 | 3 GB of memory. If unsure, say Y. | |
697 | ||
a8522509 | 698 | config IOMMU_HELPER |
18b743dc | 699 | def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU) |
d25e26b6 | 700 | |
1aaf1183 JR |
701 | config IOMMU_API |
702 | def_bool (AMD_IOMMU || DMAR) | |
703 | ||
1184dc2f | 704 | config MAXSMP |
ddb0c5a6 | 705 | bool "Enable Maximum number of SMP Processors and NUMA Nodes" |
36f5101a MT |
706 | depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL |
707 | select CPUMASK_OFFSTACK | |
8f9ca475 | 708 | ---help--- |
ddb0c5a6 | 709 | Enable maximum number of CPUS and NUMA Nodes for this architecture. |
1184dc2f | 710 | If unsure, say N. |
506f1d07 SR |
711 | |
712 | config NR_CPUS | |
36f5101a | 713 | int "Maximum number of CPUs" if SMP && !MAXSMP |
2a3313f4 | 714 | range 2 8 if SMP && X86_32 && !X86_BIGSMP |
36f5101a | 715 | range 2 512 if SMP && !MAXSMP |
78637a97 | 716 | default "1" if !SMP |
d25e26b6 | 717 | default "4096" if MAXSMP |
78637a97 MT |
718 | default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000) |
719 | default "8" if SMP | |
8f9ca475 | 720 | ---help--- |
506f1d07 | 721 | This allows you to specify the maximum number of CPUs which this |
d25e26b6 | 722 | kernel will support. The maximum supported value is 512 and the |
506f1d07 SR |
723 | minimum value which makes sense is 2. |
724 | ||
725 | This is purely to save memory - each supported CPU adds | |
726 | approximately eight kilobytes to the kernel image. | |
727 | ||
728 | config SCHED_SMT | |
729 | bool "SMT (Hyperthreading) scheduler support" | |
b089c12b | 730 | depends on X86_HT |
8f9ca475 | 731 | ---help--- |
506f1d07 SR |
732 | SMT scheduler support improves the CPU scheduler's decision making |
733 | when dealing with Intel Pentium 4 chips with HyperThreading at a | |
734 | cost of slightly increased overhead in some places. If unsure say | |
735 | N here. | |
736 | ||
737 | config SCHED_MC | |
3c2362e6 HH |
738 | def_bool y |
739 | prompt "Multi-core scheduler support" | |
b089c12b | 740 | depends on X86_HT |
8f9ca475 | 741 | ---help--- |
506f1d07 SR |
742 | Multi-core scheduler support improves the CPU scheduler's decision |
743 | making when dealing with multi-core CPU chips at a cost of slightly | |
744 | increased overhead in some places. If unsure say N here. | |
745 | ||
e82b8e4e VP |
746 | config IRQ_TIME_ACCOUNTING |
747 | bool "Fine granularity task level IRQ time accounting" | |
748 | default n | |
749 | ---help--- | |
750 | Select this option to enable fine granularity task irq time | |
751 | accounting. This is done by reading a timestamp on each | |
752 | transitions between softirq and hardirq state, so there can be a | |
753 | small performance impact. | |
754 | ||
755 | If in doubt, say N here. | |
756 | ||
506f1d07 SR |
757 | source "kernel/Kconfig.preempt" |
758 | ||
759 | config X86_UP_APIC | |
760 | bool "Local APIC support on uniprocessors" | |
e0c7ae37 | 761 | depends on X86_32 && !SMP && !X86_32_NON_STANDARD |
8f9ca475 | 762 | ---help--- |
506f1d07 SR |
763 | A local APIC (Advanced Programmable Interrupt Controller) is an |
764 | integrated interrupt controller in the CPU. If you have a single-CPU | |
765 | system which has a processor with a local APIC, you can say Y here to | |
766 | enable and use it. If you say Y here even though your machine doesn't | |
767 | have a local APIC, then the kernel will still run with no slowdown at | |
768 | all. The local APIC supports CPU-generated self-interrupts (timer, | |
769 | performance counters), and the NMI watchdog which detects hard | |
770 | lockups. | |
771 | ||
772 | config X86_UP_IOAPIC | |
773 | bool "IO-APIC support on uniprocessors" | |
774 | depends on X86_UP_APIC | |
8f9ca475 | 775 | ---help--- |
506f1d07 SR |
776 | An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an |
777 | SMP-capable replacement for PC-style interrupt controllers. Most | |
778 | SMP systems and many recent uniprocessor systems have one. | |
779 | ||
780 | If you have a single-CPU system with an IO-APIC, you can say Y here | |
781 | to use it. If you say Y here even though your machine doesn't have | |
782 | an IO-APIC, then the kernel will still run with no slowdown at all. | |
783 | ||
784 | config X86_LOCAL_APIC | |
3c2362e6 | 785 | def_bool y |
e0c7ae37 | 786 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC |
506f1d07 SR |
787 | |
788 | config X86_IO_APIC | |
3c2362e6 | 789 | def_bool y |
e0c7ae37 | 790 | depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC |
506f1d07 SR |
791 | |
792 | config X86_VISWS_APIC | |
3c2362e6 | 793 | def_bool y |
506f1d07 | 794 | depends on X86_32 && X86_VISWS |
506f1d07 | 795 | |
41b9eb26 SA |
796 | config X86_REROUTE_FOR_BROKEN_BOOT_IRQS |
797 | bool "Reroute for broken boot IRQs" | |
41b9eb26 | 798 | depends on X86_IO_APIC |
8f9ca475 | 799 | ---help--- |
41b9eb26 SA |
800 | This option enables a workaround that fixes a source of |
801 | spurious interrupts. This is recommended when threaded | |
802 | interrupt handling is used on systems where the generation of | |
803 | superfluous "boot interrupts" cannot be disabled. | |
804 | ||
805 | Some chipsets generate a legacy INTx "boot IRQ" when the IRQ | |
806 | entry in the chipset's IO-APIC is masked (as, e.g. the RT | |
807 | kernel does during interrupt handling). On chipsets where this | |
808 | boot IRQ generation cannot be disabled, this workaround keeps | |
809 | the original IRQ line masked so that only the equivalent "boot | |
810 | IRQ" is delivered to the CPUs. The workaround also tells the | |
811 | kernel to set up the IRQ handler on the boot IRQ line. In this | |
812 | way only one interrupt is delivered to the kernel. Otherwise | |
813 | the spurious second interrupt may cause the kernel to bring | |
814 | down (vital) interrupt lines. | |
815 | ||
816 | Only affects "broken" chipsets. Interrupt sharing may be | |
817 | increased on these systems. | |
818 | ||
506f1d07 | 819 | config X86_MCE |
bab9bc65 | 820 | bool "Machine Check / overheating reporting" |
506f1d07 | 821 | ---help--- |
bab9bc65 AK |
822 | Machine Check support allows the processor to notify the |
823 | kernel if it detects a problem (e.g. overheating, data corruption). | |
506f1d07 | 824 | The action the kernel takes depends on the severity of the problem, |
bab9bc65 | 825 | ranging from warning messages to halting the machine. |
4efc0670 | 826 | |
506f1d07 | 827 | config X86_MCE_INTEL |
3c2362e6 HH |
828 | def_bool y |
829 | prompt "Intel MCE features" | |
c1ebf835 | 830 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 831 | ---help--- |
506f1d07 SR |
832 | Additional support for intel specific MCE features such as |
833 | the thermal monitor. | |
834 | ||
835 | config X86_MCE_AMD | |
3c2362e6 HH |
836 | def_bool y |
837 | prompt "AMD MCE features" | |
c1ebf835 | 838 | depends on X86_MCE && X86_LOCAL_APIC |
8f9ca475 | 839 | ---help--- |
506f1d07 SR |
840 | Additional support for AMD specific MCE features such as |
841 | the DRAM Error Threshold. | |
842 | ||
4efc0670 | 843 | config X86_ANCIENT_MCE |
6fc108a0 | 844 | bool "Support for old Pentium 5 / WinChip machine checks" |
c31d9633 | 845 | depends on X86_32 && X86_MCE |
cd13adcc HS |
846 | ---help--- |
847 | Include support for machine check handling on old Pentium 5 or WinChip | |
848 | systems. These typically need to be enabled explicitely on the command | |
849 | line. | |
4efc0670 | 850 | |
b2762686 AK |
851 | config X86_MCE_THRESHOLD |
852 | depends on X86_MCE_AMD || X86_MCE_INTEL | |
6fc108a0 | 853 | def_bool y |
b2762686 | 854 | |
ea149b36 | 855 | config X86_MCE_INJECT |
c1ebf835 | 856 | depends on X86_MCE |
ea149b36 AK |
857 | tristate "Machine check injector support" |
858 | ---help--- | |
859 | Provide support for injecting machine checks for testing purposes. | |
860 | If you don't know what a machine check is and you don't do kernel | |
861 | QA it is safe to say n. | |
862 | ||
4efc0670 AK |
863 | config X86_THERMAL_VECTOR |
864 | def_bool y | |
5bb38adc | 865 | depends on X86_MCE_INTEL |
4efc0670 | 866 | |
506f1d07 SR |
867 | config VM86 |
868 | bool "Enable VM86 support" if EMBEDDED | |
869 | default y | |
870 | depends on X86_32 | |
8f9ca475 IM |
871 | ---help--- |
872 | This option is required by programs like DOSEMU to run 16-bit legacy | |
506f1d07 | 873 | code on X86 processors. It also may be needed by software like |
8f9ca475 IM |
874 | XFree86 to initialize some video cards via BIOS. Disabling this |
875 | option saves about 6k. | |
506f1d07 SR |
876 | |
877 | config TOSHIBA | |
878 | tristate "Toshiba Laptop support" | |
879 | depends on X86_32 | |
880 | ---help--- | |
881 | This adds a driver to safely access the System Management Mode of | |
882 | the CPU on Toshiba portables with a genuine Toshiba BIOS. It does | |
883 | not work on models with a Phoenix BIOS. The System Management Mode | |
884 | is used to set the BIOS and power saving options on Toshiba portables. | |
885 | ||
886 | For information on utilities to make use of this driver see the | |
887 | Toshiba Linux utilities web site at: | |
888 | <http://www.buzzard.org.uk/toshiba/>. | |
889 | ||
890 | Say Y if you intend to run this kernel on a Toshiba portable. | |
891 | Say N otherwise. | |
892 | ||
893 | config I8K | |
894 | tristate "Dell laptop support" | |
506f1d07 SR |
895 | ---help--- |
896 | This adds a driver to safely access the System Management Mode | |
897 | of the CPU on the Dell Inspiron 8000. The System Management Mode | |
898 | is used to read cpu temperature and cooling fan status and to | |
899 | control the fans on the I8K portables. | |
900 | ||
901 | This driver has been tested only on the Inspiron 8000 but it may | |
902 | also work with other Dell laptops. You can force loading on other | |
903 | models by passing the parameter `force=1' to the module. Use at | |
904 | your own risk. | |
905 | ||
906 | For information on utilities to make use of this driver see the | |
907 | I8K Linux utilities web site at: | |
908 | <http://people.debian.org/~dz/i8k/> | |
909 | ||
910 | Say Y if you intend to run this kernel on a Dell Inspiron 8000. | |
911 | Say N otherwise. | |
912 | ||
913 | config X86_REBOOTFIXUPS | |
9ba16087 JB |
914 | bool "Enable X86 board specific fixups for reboot" |
915 | depends on X86_32 | |
506f1d07 SR |
916 | ---help--- |
917 | This enables chipset and/or board specific fixups to be done | |
918 | in order to get reboot to work correctly. This is only needed on | |
919 | some combinations of hardware and BIOS. The symptom, for which | |
920 | this config is intended, is when reboot ends with a stalled/hung | |
921 | system. | |
922 | ||
923 | Currently, the only fixup is for the Geode machines using | |
5e3a77e9 | 924 | CS5530A and CS5536 chipsets and the RDC R-321x SoC. |
506f1d07 SR |
925 | |
926 | Say Y if you want to enable the fixup. Currently, it's safe to | |
927 | enable this option even if you don't need it. | |
928 | Say N otherwise. | |
929 | ||
930 | config MICROCODE | |
8d86f390 | 931 | tristate "/dev/cpu/microcode - microcode support" |
506f1d07 SR |
932 | select FW_LOADER |
933 | ---help--- | |
934 | If you say Y here, you will be able to update the microcode on | |
80cc9f10 PO |
935 | certain Intel and AMD processors. The Intel support is for the |
936 | IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, | |
937 | Pentium 4, Xeon etc. The AMD support is for family 0x10 and | |
938 | 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra. | |
939 | You will obviously need the actual microcode binary data itself | |
940 | which is not shipped with the Linux kernel. | |
506f1d07 | 941 | |
8d86f390 PO |
942 | This option selects the general module only, you need to select |
943 | at least one vendor specific module as well. | |
506f1d07 SR |
944 | |
945 | To compile this driver as a module, choose M here: the | |
946 | module will be called microcode. | |
947 | ||
8d86f390 | 948 | config MICROCODE_INTEL |
8f9ca475 IM |
949 | bool "Intel microcode patch loading support" |
950 | depends on MICROCODE | |
951 | default MICROCODE | |
952 | select FW_LOADER | |
953 | ---help--- | |
954 | This options enables microcode patch loading support for Intel | |
955 | processors. | |
956 | ||
957 | For latest news and information on obtaining all the required | |
958 | Intel ingredients for this driver, check: | |
959 | <http://www.urbanmyth.org/microcode/>. | |
8d86f390 | 960 | |
80cc9f10 | 961 | config MICROCODE_AMD |
8f9ca475 IM |
962 | bool "AMD microcode patch loading support" |
963 | depends on MICROCODE | |
964 | select FW_LOADER | |
965 | ---help--- | |
966 | If you select this option, microcode patch loading support for AMD | |
967 | processors will be enabled. | |
80cc9f10 | 968 | |
8f9ca475 | 969 | config MICROCODE_OLD_INTERFACE |
3c2362e6 | 970 | def_bool y |
506f1d07 | 971 | depends on MICROCODE |
506f1d07 SR |
972 | |
973 | config X86_MSR | |
974 | tristate "/dev/cpu/*/msr - Model-specific register support" | |
8f9ca475 | 975 | ---help--- |
506f1d07 SR |
976 | This device gives privileged processes access to the x86 |
977 | Model-Specific Registers (MSRs). It is a character device with | |
978 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. | |
979 | MSR accesses are directed to a specific CPU on multi-processor | |
980 | systems. | |
981 | ||
982 | config X86_CPUID | |
983 | tristate "/dev/cpu/*/cpuid - CPU information support" | |
8f9ca475 | 984 | ---help--- |
506f1d07 SR |
985 | This device gives processes access to the x86 CPUID instruction to |
986 | be executed on a specific processor. It is a character device | |
987 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to | |
988 | /dev/cpu/31/cpuid. | |
989 | ||
990 | choice | |
991 | prompt "High Memory Support" | |
506f1d07 | 992 | default HIGHMEM64G if X86_NUMAQ |
6fc108a0 | 993 | default HIGHMEM4G |
506f1d07 SR |
994 | depends on X86_32 |
995 | ||
996 | config NOHIGHMEM | |
997 | bool "off" | |
998 | depends on !X86_NUMAQ | |
999 | ---help--- | |
1000 | Linux can use up to 64 Gigabytes of physical memory on x86 systems. | |
1001 | However, the address space of 32-bit x86 processors is only 4 | |
1002 | Gigabytes large. That means that, if you have a large amount of | |
1003 | physical memory, not all of it can be "permanently mapped" by the | |
1004 | kernel. The physical memory that's not permanently mapped is called | |
1005 | "high memory". | |
1006 | ||
1007 | If you are compiling a kernel which will never run on a machine with | |
1008 | more than 1 Gigabyte total physical RAM, answer "off" here (default | |
1009 | choice and suitable for most users). This will result in a "3GB/1GB" | |
1010 | split: 3GB are mapped so that each process sees a 3GB virtual memory | |
1011 | space and the remaining part of the 4GB virtual memory space is used | |
1012 | by the kernel to permanently map as much physical memory as | |
1013 | possible. | |
1014 | ||
1015 | If the machine has between 1 and 4 Gigabytes physical RAM, then | |
1016 | answer "4GB" here. | |
1017 | ||
1018 | If more than 4 Gigabytes is used then answer "64GB" here. This | |
1019 | selection turns Intel PAE (Physical Address Extension) mode on. | |
1020 | PAE implements 3-level paging on IA32 processors. PAE is fully | |
1021 | supported by Linux, PAE mode is implemented on all recent Intel | |
1022 | processors (Pentium Pro and better). NOTE: If you say "64GB" here, | |
1023 | then the kernel will not boot on CPUs that don't support PAE! | |
1024 | ||
1025 | The actual amount of total physical memory will either be | |
1026 | auto detected or can be forced by using a kernel command line option | |
1027 | such as "mem=256M". (Try "man bootparam" or see the documentation of | |
1028 | your boot loader (lilo or loadlin) about how to pass options to the | |
1029 | kernel at boot time.) | |
1030 | ||
1031 | If unsure, say "off". | |
1032 | ||
1033 | config HIGHMEM4G | |
1034 | bool "4GB" | |
1035 | depends on !X86_NUMAQ | |
8f9ca475 | 1036 | ---help--- |
506f1d07 SR |
1037 | Select this if you have a 32-bit processor and between 1 and 4 |
1038 | gigabytes of physical RAM. | |
1039 | ||
1040 | config HIGHMEM64G | |
1041 | bool "64GB" | |
1042 | depends on !M386 && !M486 | |
1043 | select X86_PAE | |
8f9ca475 | 1044 | ---help--- |
506f1d07 SR |
1045 | Select this if you have a 32-bit processor and more than 4 |
1046 | gigabytes of physical RAM. | |
1047 | ||
1048 | endchoice | |
1049 | ||
1050 | choice | |
1051 | depends on EXPERIMENTAL | |
1052 | prompt "Memory split" if EMBEDDED | |
1053 | default VMSPLIT_3G | |
1054 | depends on X86_32 | |
8f9ca475 | 1055 | ---help--- |
506f1d07 SR |
1056 | Select the desired split between kernel and user memory. |
1057 | ||
1058 | If the address range available to the kernel is less than the | |
1059 | physical memory installed, the remaining memory will be available | |
1060 | as "high memory". Accessing high memory is a little more costly | |
1061 | than low memory, as it needs to be mapped into the kernel first. | |
1062 | Note that increasing the kernel address space limits the range | |
1063 | available to user programs, making the address space there | |
1064 | tighter. Selecting anything other than the default 3G/1G split | |
1065 | will also likely make your kernel incompatible with binary-only | |
1066 | kernel modules. | |
1067 | ||
1068 | If you are not absolutely sure what you are doing, leave this | |
1069 | option alone! | |
1070 | ||
1071 | config VMSPLIT_3G | |
1072 | bool "3G/1G user/kernel split" | |
1073 | config VMSPLIT_3G_OPT | |
1074 | depends on !X86_PAE | |
1075 | bool "3G/1G user/kernel split (for full 1G low memory)" | |
1076 | config VMSPLIT_2G | |
1077 | bool "2G/2G user/kernel split" | |
1078 | config VMSPLIT_2G_OPT | |
1079 | depends on !X86_PAE | |
1080 | bool "2G/2G user/kernel split (for full 2G low memory)" | |
1081 | config VMSPLIT_1G | |
1082 | bool "1G/3G user/kernel split" | |
1083 | endchoice | |
1084 | ||
1085 | config PAGE_OFFSET | |
1086 | hex | |
1087 | default 0xB0000000 if VMSPLIT_3G_OPT | |
1088 | default 0x80000000 if VMSPLIT_2G | |
1089 | default 0x78000000 if VMSPLIT_2G_OPT | |
1090 | default 0x40000000 if VMSPLIT_1G | |
1091 | default 0xC0000000 | |
1092 | depends on X86_32 | |
1093 | ||
1094 | config HIGHMEM | |
3c2362e6 | 1095 | def_bool y |
506f1d07 | 1096 | depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) |
506f1d07 SR |
1097 | |
1098 | config X86_PAE | |
9ba16087 | 1099 | bool "PAE (Physical Address Extension) Support" |
506f1d07 | 1100 | depends on X86_32 && !HIGHMEM4G |
8f9ca475 | 1101 | ---help--- |
506f1d07 SR |
1102 | PAE is required for NX support, and furthermore enables |
1103 | larger swapspace support for non-overcommit purposes. It | |
1104 | has the cost of more pagetable lookup overhead, and also | |
1105 | consumes more pagetable space per process. | |
1106 | ||
600715dc | 1107 | config ARCH_PHYS_ADDR_T_64BIT |
8f9ca475 | 1108 | def_bool X86_64 || X86_PAE |
600715dc | 1109 | |
66f2b061 FT |
1110 | config ARCH_DMA_ADDR_T_64BIT |
1111 | def_bool X86_64 || HIGHMEM64G | |
1112 | ||
9e899816 NP |
1113 | config DIRECT_GBPAGES |
1114 | bool "Enable 1GB pages for kernel pagetables" if EMBEDDED | |
1115 | default y | |
1116 | depends on X86_64 | |
8f9ca475 | 1117 | ---help--- |
9e899816 NP |
1118 | Allow the kernel linear mapping to use 1GB pages on CPUs that |
1119 | support it. This can improve the kernel's performance a tiny bit by | |
1120 | reducing TLB pressure. If in doubt, say "Y". | |
1121 | ||
506f1d07 SR |
1122 | # Common NUMA Features |
1123 | config NUMA | |
fd51b2d7 | 1124 | bool "Numa Memory Allocation and Scheduler Support" |
506f1d07 | 1125 | depends on SMP |
604d2055 | 1126 | depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL) |
0699eae1 | 1127 | default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP) |
8f9ca475 | 1128 | ---help--- |
506f1d07 | 1129 | Enable NUMA (Non Uniform Memory Access) support. |
fd51b2d7 | 1130 | |
506f1d07 SR |
1131 | The kernel will try to allocate memory used by a CPU on the |
1132 | local memory controller of the CPU and add some more | |
1133 | NUMA awareness to the kernel. | |
1134 | ||
c280ea5e | 1135 | For 64-bit this is recommended if the system is Intel Core i7 |
fd51b2d7 KM |
1136 | (or later), AMD Opteron, or EM64T NUMA. |
1137 | ||
1138 | For 32-bit this is only needed on (rare) 32-bit-only platforms | |
1139 | that support NUMA topologies, such as NUMAQ / Summit, or if you | |
1140 | boot a 32-bit kernel on a 64-bit NUMA platform. | |
1141 | ||
1142 | Otherwise, you should say N. | |
506f1d07 SR |
1143 | |
1144 | comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI" | |
1145 | depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI) | |
1146 | ||
1147 | config K8_NUMA | |
3c2362e6 HH |
1148 | def_bool y |
1149 | prompt "Old style AMD Opteron NUMA detection" | |
1150 | depends on X86_64 && NUMA && PCI | |
8f9ca475 IM |
1151 | ---help--- |
1152 | Enable K8 NUMA node topology detection. You should say Y here if | |
1153 | you have a multi processor AMD K8 system. This uses an old | |
1154 | method to read the NUMA configuration directly from the builtin | |
1155 | Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA | |
1156 | instead, which also takes priority if both are compiled in. | |
506f1d07 SR |
1157 | |
1158 | config X86_64_ACPI_NUMA | |
3c2362e6 HH |
1159 | def_bool y |
1160 | prompt "ACPI NUMA detection" | |
506f1d07 SR |
1161 | depends on X86_64 && NUMA && ACPI && PCI |
1162 | select ACPI_NUMA | |
8f9ca475 | 1163 | ---help--- |
506f1d07 SR |
1164 | Enable ACPI SRAT based node topology detection. |
1165 | ||
6ec6e0d9 SS |
1166 | # Some NUMA nodes have memory ranges that span |
1167 | # other nodes. Even though a pfn is valid and | |
1168 | # between a node's start and end pfns, it may not | |
1169 | # reside on that node. See memmap_init_zone() | |
1170 | # for details. | |
1171 | config NODES_SPAN_OTHER_NODES | |
1172 | def_bool y | |
1173 | depends on X86_64_ACPI_NUMA | |
1174 | ||
506f1d07 SR |
1175 | config NUMA_EMU |
1176 | bool "NUMA emulation" | |
1177 | depends on X86_64 && NUMA | |
8f9ca475 | 1178 | ---help--- |
506f1d07 SR |
1179 | Enable NUMA emulation. A flat machine will be split |
1180 | into virtual nodes when booted with "numa=fake=N", where N is the | |
1181 | number of nodes. This is only useful for debugging. | |
1182 | ||
1183 | config NODES_SHIFT | |
d25e26b6 | 1184 | int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP |
51591e31 DR |
1185 | range 1 10 |
1186 | default "10" if MAXSMP | |
506f1d07 SR |
1187 | default "6" if X86_64 |
1188 | default "4" if X86_NUMAQ | |
1189 | default "3" | |
1190 | depends on NEED_MULTIPLE_NODES | |
8f9ca475 | 1191 | ---help--- |
1184dc2f | 1192 | Specify the maximum number of NUMA Nodes available on the target |
692105b8 | 1193 | system. Increases memory reserved to accommodate various tables. |
506f1d07 | 1194 | |
c1329375 | 1195 | config HAVE_ARCH_BOOTMEM |
3c2362e6 | 1196 | def_bool y |
506f1d07 | 1197 | depends on X86_32 && NUMA |
506f1d07 SR |
1198 | |
1199 | config ARCH_HAVE_MEMORY_PRESENT | |
3c2362e6 | 1200 | def_bool y |
506f1d07 | 1201 | depends on X86_32 && DISCONTIGMEM |
506f1d07 SR |
1202 | |
1203 | config NEED_NODE_MEMMAP_SIZE | |
3c2362e6 | 1204 | def_bool y |
506f1d07 | 1205 | depends on X86_32 && (DISCONTIGMEM || SPARSEMEM) |
506f1d07 SR |
1206 | |
1207 | config HAVE_ARCH_ALLOC_REMAP | |
3c2362e6 | 1208 | def_bool y |
506f1d07 | 1209 | depends on X86_32 && NUMA |
506f1d07 SR |
1210 | |
1211 | config ARCH_FLATMEM_ENABLE | |
1212 | def_bool y | |
99809963 | 1213 | depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA |
506f1d07 SR |
1214 | |
1215 | config ARCH_DISCONTIGMEM_ENABLE | |
1216 | def_bool y | |
b263295d | 1217 | depends on NUMA && X86_32 |
506f1d07 SR |
1218 | |
1219 | config ARCH_DISCONTIGMEM_DEFAULT | |
1220 | def_bool y | |
b263295d CL |
1221 | depends on NUMA && X86_32 |
1222 | ||
9492587c KH |
1223 | config ARCH_PROC_KCORE_TEXT |
1224 | def_bool y | |
1225 | depends on X86_64 && PROC_KCORE | |
1226 | ||
b263295d CL |
1227 | config ARCH_SPARSEMEM_DEFAULT |
1228 | def_bool y | |
1229 | depends on X86_64 | |
506f1d07 SR |
1230 | |
1231 | config ARCH_SPARSEMEM_ENABLE | |
1232 | def_bool y | |
4272ebfb | 1233 | depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD |
506f1d07 SR |
1234 | select SPARSEMEM_STATIC if X86_32 |
1235 | select SPARSEMEM_VMEMMAP_ENABLE if X86_64 | |
1236 | ||
1237 | config ARCH_SELECT_MEMORY_MODEL | |
1238 | def_bool y | |
b263295d | 1239 | depends on ARCH_SPARSEMEM_ENABLE |
506f1d07 SR |
1240 | |
1241 | config ARCH_MEMORY_PROBE | |
1242 | def_bool X86_64 | |
1243 | depends on MEMORY_HOTPLUG | |
1244 | ||
a29815a3 AK |
1245 | config ILLEGAL_POINTER_VALUE |
1246 | hex | |
1247 | default 0 if X86_32 | |
1248 | default 0xdead000000000000 if X86_64 | |
1249 | ||
506f1d07 SR |
1250 | source "mm/Kconfig" |
1251 | ||
1252 | config HIGHPTE | |
1253 | bool "Allocate 3rd-level pagetables from highmem" | |
6fc108a0 | 1254 | depends on HIGHMEM |
8f9ca475 | 1255 | ---help--- |
506f1d07 SR |
1256 | The VM uses one page table entry for each page of physical memory. |
1257 | For systems with a lot of RAM, this can be wasteful of precious | |
1258 | low memory. Setting this option will put user-space page table | |
1259 | entries in high memory. | |
1260 | ||
9f077871 | 1261 | config X86_CHECK_BIOS_CORRUPTION |
8f9ca475 IM |
1262 | bool "Check for low memory corruption" |
1263 | ---help--- | |
1264 | Periodically check for memory corruption in low memory, which | |
1265 | is suspected to be caused by BIOS. Even when enabled in the | |
1266 | configuration, it is disabled at runtime. Enable it by | |
1267 | setting "memory_corruption_check=1" on the kernel command | |
1268 | line. By default it scans the low 64k of memory every 60 | |
1269 | seconds; see the memory_corruption_check_size and | |
1270 | memory_corruption_check_period parameters in | |
1271 | Documentation/kernel-parameters.txt to adjust this. | |
1272 | ||
1273 | When enabled with the default parameters, this option has | |
1274 | almost no overhead, as it reserves a relatively small amount | |
1275 | of memory and scans it infrequently. It both detects corruption | |
1276 | and prevents it from affecting the running system. | |
1277 | ||
1278 | It is, however, intended as a diagnostic tool; if repeatable | |
1279 | BIOS-originated corruption always affects the same memory, | |
1280 | you can use memmap= to prevent the kernel from using that | |
1281 | memory. | |
9f077871 | 1282 | |
c885df50 | 1283 | config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK |
8f9ca475 | 1284 | bool "Set the default setting of memory_corruption_check" |
c885df50 JF |
1285 | depends on X86_CHECK_BIOS_CORRUPTION |
1286 | default y | |
8f9ca475 IM |
1287 | ---help--- |
1288 | Set whether the default state of memory_corruption_check is | |
1289 | on or off. | |
c885df50 | 1290 | |
9ea77bdb | 1291 | config X86_RESERVE_LOW |
d0cd7425 PA |
1292 | int "Amount of low memory, in kilobytes, to reserve for the BIOS" |
1293 | default 64 | |
1294 | range 4 640 | |
8f9ca475 | 1295 | ---help--- |
d0cd7425 PA |
1296 | Specify the amount of low memory to reserve for the BIOS. |
1297 | ||
1298 | The first page contains BIOS data structures that the kernel | |
1299 | must not use, so that page must always be reserved. | |
1300 | ||
1301 | By default we reserve the first 64K of physical RAM, as a | |
1302 | number of BIOSes are known to corrupt that memory range | |
1303 | during events such as suspend/resume or monitor cable | |
1304 | insertion, so it must not be used by the kernel. | |
fc381519 | 1305 | |
d0cd7425 PA |
1306 | You can set this to 4 if you are absolutely sure that you |
1307 | trust the BIOS to get all its memory reservations and usages | |
1308 | right. If you know your BIOS have problems beyond the | |
1309 | default 64K area, you can set this to 640 to avoid using the | |
1310 | entire low memory range. | |
fc381519 | 1311 | |
d0cd7425 PA |
1312 | If you have doubts about the BIOS (e.g. suspend/resume does |
1313 | not work or there's kernel crashes after certain hardware | |
1314 | hotplug events) then you might want to enable | |
1315 | X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check | |
1316 | typical corruption patterns. | |
fc381519 | 1317 | |
d0cd7425 | 1318 | Leave this to the default value of 64 if you are unsure. |
fc381519 | 1319 | |
506f1d07 SR |
1320 | config MATH_EMULATION |
1321 | bool | |
1322 | prompt "Math emulation" if X86_32 | |
1323 | ---help--- | |
1324 | Linux can emulate a math coprocessor (used for floating point | |
1325 | operations) if you don't have one. 486DX and Pentium processors have | |
1326 | a math coprocessor built in, 486SX and 386 do not, unless you added | |
1327 | a 487DX or 387, respectively. (The messages during boot time can | |
1328 | give you some hints here ["man dmesg"].) Everyone needs either a | |
1329 | coprocessor or this emulation. | |
1330 | ||
1331 | If you don't have a math coprocessor, you need to say Y here; if you | |
1332 | say Y here even though you have a coprocessor, the coprocessor will | |
1333 | be used nevertheless. (This behavior can be changed with the kernel | |
1334 | command line option "no387", which comes handy if your coprocessor | |
1335 | is broken. Try "man bootparam" or see the documentation of your boot | |
1336 | loader (lilo or loadlin) about how to pass options to the kernel at | |
1337 | boot time.) This means that it is a good idea to say Y here if you | |
1338 | intend to use this kernel on different machines. | |
1339 | ||
1340 | More information about the internals of the Linux math coprocessor | |
1341 | emulation can be found in <file:arch/x86/math-emu/README>. | |
1342 | ||
1343 | If you are not sure, say Y; apart from resulting in a 66 KB bigger | |
1344 | kernel, it won't hurt. | |
1345 | ||
1346 | config MTRR | |
6fc108a0 | 1347 | def_bool y |
c03cb314 | 1348 | prompt "MTRR (Memory Type Range Register) support" if EMBEDDED |
506f1d07 SR |
1349 | ---help--- |
1350 | On Intel P6 family processors (Pentium Pro, Pentium II and later) | |
1351 | the Memory Type Range Registers (MTRRs) may be used to control | |
1352 | processor access to memory ranges. This is most useful if you have | |
1353 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining | |
1354 | allows bus write transfers to be combined into a larger transfer | |
1355 | before bursting over the PCI/AGP bus. This can increase performance | |
1356 | of image write operations 2.5 times or more. Saying Y here creates a | |
1357 | /proc/mtrr file which may be used to manipulate your processor's | |
1358 | MTRRs. Typically the X server should use this. | |
1359 | ||
1360 | This code has a reasonably generic interface so that similar | |
1361 | control registers on other processors can be easily supported | |
1362 | as well: | |
1363 | ||
1364 | The Cyrix 6x86, 6x86MX and M II processors have Address Range | |
1365 | Registers (ARRs) which provide a similar functionality to MTRRs. For | |
1366 | these, the ARRs are used to emulate the MTRRs. | |
1367 | The AMD K6-2 (stepping 8 and above) and K6-3 processors have two | |
1368 | MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing | |
1369 | write-combining. All of these processors are supported by this code | |
1370 | and it makes sense to say Y here if you have one of them. | |
1371 | ||
1372 | Saying Y here also fixes a problem with buggy SMP BIOSes which only | |
1373 | set the MTRRs for the boot CPU and not for the secondary CPUs. This | |
1374 | can lead to all sorts of problems, so it's good to say Y here. | |
1375 | ||
1376 | You can safely say Y even if your machine doesn't have MTRRs, you'll | |
1377 | just add about 9 KB to your kernel. | |
1378 | ||
7225e751 | 1379 | See <file:Documentation/x86/mtrr.txt> for more information. |
506f1d07 | 1380 | |
95ffa243 | 1381 | config MTRR_SANITIZER |
2ffb3501 | 1382 | def_bool y |
95ffa243 YL |
1383 | prompt "MTRR cleanup support" |
1384 | depends on MTRR | |
8f9ca475 | 1385 | ---help--- |
aba3728c TG |
1386 | Convert MTRR layout from continuous to discrete, so X drivers can |
1387 | add writeback entries. | |
95ffa243 | 1388 | |
aba3728c | 1389 | Can be disabled with disable_mtrr_cleanup on the kernel command line. |
692105b8 | 1390 | The largest mtrr entry size for a continuous block can be set with |
aba3728c | 1391 | mtrr_chunk_size. |
95ffa243 | 1392 | |
2ffb3501 | 1393 | If unsure, say Y. |
95ffa243 YL |
1394 | |
1395 | config MTRR_SANITIZER_ENABLE_DEFAULT | |
f5098d62 YL |
1396 | int "MTRR cleanup enable value (0-1)" |
1397 | range 0 1 | |
1398 | default "0" | |
95ffa243 | 1399 | depends on MTRR_SANITIZER |
8f9ca475 | 1400 | ---help--- |
f5098d62 | 1401 | Enable mtrr cleanup default value |
95ffa243 | 1402 | |
12031a62 YL |
1403 | config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT |
1404 | int "MTRR cleanup spare reg num (0-7)" | |
1405 | range 0 7 | |
1406 | default "1" | |
1407 | depends on MTRR_SANITIZER | |
8f9ca475 | 1408 | ---help--- |
12031a62 | 1409 | mtrr cleanup spare entries default, it can be changed via |
aba3728c | 1410 | mtrr_spare_reg_nr=N on the kernel command line. |
12031a62 | 1411 | |
2e5d9c85 | 1412 | config X86_PAT |
6fc108a0 | 1413 | def_bool y |
c03cb314 | 1414 | prompt "x86 PAT support" if EMBEDDED |
2a8a2719 | 1415 | depends on MTRR |
8f9ca475 | 1416 | ---help--- |
2e5d9c85 | 1417 | Use PAT attributes to setup page level cache control. |
042b78e4 | 1418 | |
2e5d9c85 | 1419 | PATs are the modern equivalents of MTRRs and are much more |
1420 | flexible than MTRRs. | |
1421 | ||
1422 | Say N here if you see bootup problems (boot crash, boot hang, | |
042b78e4 | 1423 | spontaneous reboots) or a non-working video driver. |
2e5d9c85 | 1424 | |
1425 | If unsure, say Y. | |
1426 | ||
46cf98cd VP |
1427 | config ARCH_USES_PG_UNCACHED |
1428 | def_bool y | |
1429 | depends on X86_PAT | |
1430 | ||
506f1d07 | 1431 | config EFI |
9ba16087 | 1432 | bool "EFI runtime service support" |
5b83683f | 1433 | depends on ACPI |
506f1d07 | 1434 | ---help--- |
8f9ca475 IM |
1435 | This enables the kernel to use EFI runtime services that are |
1436 | available (such as the EFI variable services). | |
506f1d07 | 1437 | |
8f9ca475 IM |
1438 | This option is only useful on systems that have EFI firmware. |
1439 | In addition, you should use the latest ELILO loader available | |
1440 | at <http://elilo.sourceforge.net> in order to take advantage | |
1441 | of EFI runtime services. However, even with this option, the | |
1442 | resultant kernel should continue to boot on existing non-EFI | |
1443 | platforms. | |
506f1d07 | 1444 | |
506f1d07 | 1445 | config SECCOMP |
3c2362e6 HH |
1446 | def_bool y |
1447 | prompt "Enable seccomp to safely compute untrusted bytecode" | |
8f9ca475 | 1448 | ---help--- |
506f1d07 SR |
1449 | This kernel feature is useful for number crunching applications |
1450 | that may need to compute untrusted bytecode during their | |
1451 | execution. By using pipes or other transports made available to | |
1452 | the process as file descriptors supporting the read/write | |
1453 | syscalls, it's possible to isolate those applications in | |
1454 | their own address space using seccomp. Once seccomp is | |
9c0bbee8 | 1455 | enabled via prctl(PR_SET_SECCOMP), it cannot be disabled |
506f1d07 SR |
1456 | and the task is only allowed to execute a few safe syscalls |
1457 | defined by each seccomp mode. | |
1458 | ||
1459 | If unsure, say Y. Only embedded should say N here. | |
1460 | ||
1461 | config CC_STACKPROTECTOR | |
1462 | bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)" | |
8f9ca475 IM |
1463 | ---help--- |
1464 | This option turns on the -fstack-protector GCC feature. This | |
113c5413 IM |
1465 | feature puts, at the beginning of functions, a canary value on |
1466 | the stack just before the return address, and validates | |
506f1d07 SR |
1467 | the value just before actually returning. Stack based buffer |
1468 | overflows (that need to overwrite this return address) now also | |
1469 | overwrite the canary, which gets detected and the attack is then | |
1470 | neutralized via a kernel panic. | |
1471 | ||
1472 | This feature requires gcc version 4.2 or above, or a distribution | |
1473 | gcc with the feature backported. Older versions are automatically | |
113c5413 IM |
1474 | detected and for those versions, this configuration option is |
1475 | ignored. (and a warning is printed during bootup) | |
506f1d07 SR |
1476 | |
1477 | source kernel/Kconfig.hz | |
1478 | ||
1479 | config KEXEC | |
1480 | bool "kexec system call" | |
8f9ca475 | 1481 | ---help--- |
506f1d07 SR |
1482 | kexec is a system call that implements the ability to shutdown your |
1483 | current kernel, and to start another kernel. It is like a reboot | |
1484 | but it is independent of the system firmware. And like a reboot | |
1485 | you can start any kernel with it, not just Linux. | |
1486 | ||
1487 | The name comes from the similarity to the exec system call. | |
1488 | ||
1489 | It is an ongoing process to be certain the hardware in a machine | |
1490 | is properly shutdown, so do not be surprised if this code does not | |
1491 | initially work for you. It may help to enable device hotplugging | |
1492 | support. As of this writing the exact hardware interface is | |
1493 | strongly in flux, so no good recommendation can be made. | |
1494 | ||
1495 | config CRASH_DUMP | |
04b69447 | 1496 | bool "kernel crash dumps" |
506f1d07 | 1497 | depends on X86_64 || (X86_32 && HIGHMEM) |
8f9ca475 | 1498 | ---help--- |
506f1d07 SR |
1499 | Generate crash dump after being started by kexec. |
1500 | This should be normally only set in special crash dump kernels | |
1501 | which are loaded in the main kernel with kexec-tools into | |
1502 | a specially reserved region and then later executed after | |
1503 | a crash by kdump/kexec. The crash dump kernel must be compiled | |
1504 | to a memory address not used by the main kernel or BIOS using | |
1505 | PHYSICAL_START, or it must be built as a relocatable image | |
1506 | (CONFIG_RELOCATABLE=y). | |
1507 | For more details see Documentation/kdump/kdump.txt | |
1508 | ||
3ab83521 HY |
1509 | config KEXEC_JUMP |
1510 | bool "kexec jump (EXPERIMENTAL)" | |
1511 | depends on EXPERIMENTAL | |
fee7b0d8 | 1512 | depends on KEXEC && HIBERNATION |
8f9ca475 | 1513 | ---help--- |
89081d17 HY |
1514 | Jump between original kernel and kexeced kernel and invoke |
1515 | code in physical address mode via KEXEC | |
3ab83521 | 1516 | |
506f1d07 SR |
1517 | config PHYSICAL_START |
1518 | hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP) | |
ceefccc9 | 1519 | default "0x1000000" |
8f9ca475 | 1520 | ---help--- |
506f1d07 SR |
1521 | This gives the physical address where the kernel is loaded. |
1522 | ||
1523 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then | |
1524 | bzImage will decompress itself to above physical address and | |
1525 | run from there. Otherwise, bzImage will run from the address where | |
1526 | it has been loaded by the boot loader and will ignore above physical | |
1527 | address. | |
1528 | ||
1529 | In normal kdump cases one does not have to set/change this option | |
1530 | as now bzImage can be compiled as a completely relocatable image | |
1531 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different | |
1532 | address. This option is mainly useful for the folks who don't want | |
1533 | to use a bzImage for capturing the crash dump and want to use a | |
1534 | vmlinux instead. vmlinux is not relocatable hence a kernel needs | |
1535 | to be specifically compiled to run from a specific memory area | |
1536 | (normally a reserved region) and this option comes handy. | |
1537 | ||
ceefccc9 PA |
1538 | So if you are using bzImage for capturing the crash dump, |
1539 | leave the value here unchanged to 0x1000000 and set | |
1540 | CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux | |
1541 | for capturing the crash dump change this value to start of | |
1542 | the reserved region. In other words, it can be set based on | |
1543 | the "X" value as specified in the "crashkernel=YM@XM" | |
1544 | command line boot parameter passed to the panic-ed | |
1545 | kernel. Please take a look at Documentation/kdump/kdump.txt | |
1546 | for more details about crash dumps. | |
506f1d07 SR |
1547 | |
1548 | Usage of bzImage for capturing the crash dump is recommended as | |
1549 | one does not have to build two kernels. Same kernel can be used | |
1550 | as production kernel and capture kernel. Above option should have | |
1551 | gone away after relocatable bzImage support is introduced. But it | |
1552 | is present because there are users out there who continue to use | |
1553 | vmlinux for dump capture. This option should go away down the | |
1554 | line. | |
1555 | ||
1556 | Don't change this unless you know what you are doing. | |
1557 | ||
1558 | config RELOCATABLE | |
26717808 PA |
1559 | bool "Build a relocatable kernel" |
1560 | default y | |
8f9ca475 | 1561 | ---help--- |
506f1d07 SR |
1562 | This builds a kernel image that retains relocation information |
1563 | so it can be loaded someplace besides the default 1MB. | |
1564 | The relocations tend to make the kernel binary about 10% larger, | |
1565 | but are discarded at runtime. | |
1566 | ||
1567 | One use is for the kexec on panic case where the recovery kernel | |
1568 | must live at a different physical address than the primary | |
1569 | kernel. | |
1570 | ||
1571 | Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address | |
1572 | it has been loaded at and the compile time physical address | |
1573 | (CONFIG_PHYSICAL_START) is ignored. | |
1574 | ||
845adf72 PA |
1575 | # Relocation on x86-32 needs some additional build support |
1576 | config X86_NEED_RELOCS | |
1577 | def_bool y | |
1578 | depends on X86_32 && RELOCATABLE | |
1579 | ||
506f1d07 | 1580 | config PHYSICAL_ALIGN |
6fc108a0 | 1581 | hex "Alignment value to which kernel should be aligned" if X86_32 |
ceefccc9 PA |
1582 | default "0x1000000" |
1583 | range 0x2000 0x1000000 | |
8f9ca475 | 1584 | ---help--- |
506f1d07 SR |
1585 | This value puts the alignment restrictions on physical address |
1586 | where kernel is loaded and run from. Kernel is compiled for an | |
1587 | address which meets above alignment restriction. | |
1588 | ||
1589 | If bootloader loads the kernel at a non-aligned address and | |
1590 | CONFIG_RELOCATABLE is set, kernel will move itself to nearest | |
1591 | address aligned to above value and run from there. | |
1592 | ||
1593 | If bootloader loads the kernel at a non-aligned address and | |
1594 | CONFIG_RELOCATABLE is not set, kernel will ignore the run time | |
1595 | load address and decompress itself to the address it has been | |
1596 | compiled for and run from there. The address for which kernel is | |
1597 | compiled already meets above alignment restrictions. Hence the | |
1598 | end result is that kernel runs from a physical address meeting | |
1599 | above alignment restrictions. | |
1600 | ||
1601 | Don't change this unless you know what you are doing. | |
1602 | ||
1603 | config HOTPLUG_CPU | |
7c13e6a3 | 1604 | bool "Support for hot-pluggable CPUs" |
4b19ed91 | 1605 | depends on SMP && HOTPLUG |
506f1d07 | 1606 | ---help--- |
7c13e6a3 DS |
1607 | Say Y here to allow turning CPUs off and on. CPUs can be |
1608 | controlled through /sys/devices/system/cpu. | |
1609 | ( Note: power management support will enable this option | |
1610 | automatically on SMP systems. ) | |
1611 | Say N if you want to disable CPU hotplug. | |
506f1d07 SR |
1612 | |
1613 | config COMPAT_VDSO | |
3c2362e6 HH |
1614 | def_bool y |
1615 | prompt "Compat VDSO support" | |
af65d648 | 1616 | depends on X86_32 || IA32_EMULATION |
8f9ca475 | 1617 | ---help--- |
af65d648 | 1618 | Map the 32-bit VDSO to the predictable old-style address too. |
e84446de | 1619 | |
506f1d07 SR |
1620 | Say N here if you are running a sufficiently recent glibc |
1621 | version (2.3.3 or later), to remove the high-mapped | |
1622 | VDSO mapping and to exclusively use the randomized VDSO. | |
1623 | ||
1624 | If unsure, say Y. | |
1625 | ||
516cbf37 TB |
1626 | config CMDLINE_BOOL |
1627 | bool "Built-in kernel command line" | |
8f9ca475 | 1628 | ---help--- |
516cbf37 TB |
1629 | Allow for specifying boot arguments to the kernel at |
1630 | build time. On some systems (e.g. embedded ones), it is | |
1631 | necessary or convenient to provide some or all of the | |
1632 | kernel boot arguments with the kernel itself (that is, | |
1633 | to not rely on the boot loader to provide them.) | |
1634 | ||
1635 | To compile command line arguments into the kernel, | |
1636 | set this option to 'Y', then fill in the | |
1637 | the boot arguments in CONFIG_CMDLINE. | |
1638 | ||
1639 | Systems with fully functional boot loaders (i.e. non-embedded) | |
1640 | should leave this option set to 'N'. | |
1641 | ||
1642 | config CMDLINE | |
1643 | string "Built-in kernel command string" | |
1644 | depends on CMDLINE_BOOL | |
1645 | default "" | |
8f9ca475 | 1646 | ---help--- |
516cbf37 TB |
1647 | Enter arguments here that should be compiled into the kernel |
1648 | image and used at boot time. If the boot loader provides a | |
1649 | command line at boot time, it is appended to this string to | |
1650 | form the full kernel command line, when the system boots. | |
1651 | ||
1652 | However, you can use the CONFIG_CMDLINE_OVERRIDE option to | |
1653 | change this behavior. | |
1654 | ||
1655 | In most cases, the command line (whether built-in or provided | |
1656 | by the boot loader) should specify the device for the root | |
1657 | file system. | |
1658 | ||
1659 | config CMDLINE_OVERRIDE | |
1660 | bool "Built-in command line overrides boot loader arguments" | |
516cbf37 | 1661 | depends on CMDLINE_BOOL |
8f9ca475 | 1662 | ---help--- |
516cbf37 TB |
1663 | Set this option to 'Y' to have the kernel ignore the boot loader |
1664 | command line, and use ONLY the built-in command line. | |
1665 | ||
1666 | This is used to work around broken boot loaders. This should | |
1667 | be set to 'N' under normal conditions. | |
1668 | ||
506f1d07 SR |
1669 | endmenu |
1670 | ||
1671 | config ARCH_ENABLE_MEMORY_HOTPLUG | |
1672 | def_bool y | |
1673 | depends on X86_64 || (X86_32 && HIGHMEM) | |
1674 | ||
35551053 GH |
1675 | config ARCH_ENABLE_MEMORY_HOTREMOVE |
1676 | def_bool y | |
1677 | depends on MEMORY_HOTPLUG | |
1678 | ||
506f1d07 SR |
1679 | config HAVE_ARCH_EARLY_PFN_TO_NID |
1680 | def_bool X86_64 | |
1681 | depends on NUMA | |
1682 | ||
e534c7c5 LS |
1683 | config USE_PERCPU_NUMA_NODE_ID |
1684 | def_bool X86_64 | |
1685 | depends on NUMA | |
1686 | ||
da85f865 | 1687 | menu "Power management and ACPI options" |
e279b6c1 SR |
1688 | |
1689 | config ARCH_HIBERNATION_HEADER | |
3c2362e6 | 1690 | def_bool y |
e279b6c1 | 1691 | depends on X86_64 && HIBERNATION |
e279b6c1 SR |
1692 | |
1693 | source "kernel/power/Kconfig" | |
1694 | ||
1695 | source "drivers/acpi/Kconfig" | |
1696 | ||
efafc8b2 FT |
1697 | source "drivers/sfi/Kconfig" |
1698 | ||
a6b68076 | 1699 | config X86_APM_BOOT |
6fc108a0 | 1700 | def_bool y |
a6b68076 AK |
1701 | depends on APM || APM_MODULE |
1702 | ||
e279b6c1 SR |
1703 | menuconfig APM |
1704 | tristate "APM (Advanced Power Management) BIOS support" | |
efefa6f6 | 1705 | depends on X86_32 && PM_SLEEP |
e279b6c1 SR |
1706 | ---help--- |
1707 | APM is a BIOS specification for saving power using several different | |
1708 | techniques. This is mostly useful for battery powered laptops with | |
1709 | APM compliant BIOSes. If you say Y here, the system time will be | |
1710 | reset after a RESUME operation, the /proc/apm device will provide | |
1711 | battery status information, and user-space programs will receive | |
1712 | notification of APM "events" (e.g. battery status change). | |
1713 | ||
1714 | If you select "Y" here, you can disable actual use of the APM | |
1715 | BIOS by passing the "apm=off" option to the kernel at boot time. | |
1716 | ||
1717 | Note that the APM support is almost completely disabled for | |
1718 | machines with more than one CPU. | |
1719 | ||
1720 | In order to use APM, you will need supporting software. For location | |
53471121 | 1721 | and more information, read <file:Documentation/power/pm.txt> and the |
e279b6c1 SR |
1722 | Battery Powered Linux mini-HOWTO, available from |
1723 | <http://www.tldp.org/docs.html#howto>. | |
1724 | ||
1725 | This driver does not spin down disk drives (see the hdparm(8) | |
1726 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
1727 | VESA-compliant "green" monitors. | |
1728 | ||
1729 | This driver does not support the TI 4000M TravelMate and the ACER | |
1730 | 486/DX4/75 because they don't have compliant BIOSes. Many "green" | |
1731 | desktop machines also don't have compliant BIOSes, and this driver | |
1732 | may cause those machines to panic during the boot phase. | |
1733 | ||
1734 | Generally, if you don't have a battery in your machine, there isn't | |
1735 | much point in using this driver and you should say N. If you get | |
1736 | random kernel OOPSes or reboots that don't seem to be related to | |
1737 | anything, try disabling/enabling this option (or disabling/enabling | |
1738 | APM in your BIOS). | |
1739 | ||
1740 | Some other things you should try when experiencing seemingly random, | |
1741 | "weird" problems: | |
1742 | ||
1743 | 1) make sure that you have enough swap space and that it is | |
1744 | enabled. | |
1745 | 2) pass the "no-hlt" option to the kernel | |
1746 | 3) switch on floating point emulation in the kernel and pass | |
1747 | the "no387" option to the kernel | |
1748 | 4) pass the "floppy=nodma" option to the kernel | |
1749 | 5) pass the "mem=4M" option to the kernel (thereby disabling | |
1750 | all but the first 4 MB of RAM) | |
1751 | 6) make sure that the CPU is not over clocked. | |
1752 | 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> | |
1753 | 8) disable the cache from your BIOS settings | |
1754 | 9) install a fan for the video card or exchange video RAM | |
1755 | 10) install a better fan for the CPU | |
1756 | 11) exchange RAM chips | |
1757 | 12) exchange the motherboard. | |
1758 | ||
1759 | To compile this driver as a module, choose M here: the | |
1760 | module will be called apm. | |
1761 | ||
1762 | if APM | |
1763 | ||
1764 | config APM_IGNORE_USER_SUSPEND | |
1765 | bool "Ignore USER SUSPEND" | |
8f9ca475 | 1766 | ---help--- |
e279b6c1 SR |
1767 | This option will ignore USER SUSPEND requests. On machines with a |
1768 | compliant APM BIOS, you want to say N. However, on the NEC Versa M | |
1769 | series notebooks, it is necessary to say Y because of a BIOS bug. | |
1770 | ||
1771 | config APM_DO_ENABLE | |
1772 | bool "Enable PM at boot time" | |
1773 | ---help--- | |
1774 | Enable APM features at boot time. From page 36 of the APM BIOS | |
1775 | specification: "When disabled, the APM BIOS does not automatically | |
1776 | power manage devices, enter the Standby State, enter the Suspend | |
1777 | State, or take power saving steps in response to CPU Idle calls." | |
1778 | This driver will make CPU Idle calls when Linux is idle (unless this | |
1779 | feature is turned off -- see "Do CPU IDLE calls", below). This | |
1780 | should always save battery power, but more complicated APM features | |
1781 | will be dependent on your BIOS implementation. You may need to turn | |
1782 | this option off if your computer hangs at boot time when using APM | |
1783 | support, or if it beeps continuously instead of suspending. Turn | |
1784 | this off if you have a NEC UltraLite Versa 33/C or a Toshiba | |
1785 | T400CDT. This is off by default since most machines do fine without | |
1786 | this feature. | |
1787 | ||
1788 | config APM_CPU_IDLE | |
1789 | bool "Make CPU Idle calls when idle" | |
8f9ca475 | 1790 | ---help--- |
e279b6c1 SR |
1791 | Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. |
1792 | On some machines, this can activate improved power savings, such as | |
1793 | a slowed CPU clock rate, when the machine is idle. These idle calls | |
1794 | are made after the idle loop has run for some length of time (e.g., | |
1795 | 333 mS). On some machines, this will cause a hang at boot time or | |
1796 | whenever the CPU becomes idle. (On machines with more than one CPU, | |
1797 | this option does nothing.) | |
1798 | ||
1799 | config APM_DISPLAY_BLANK | |
1800 | bool "Enable console blanking using APM" | |
8f9ca475 | 1801 | ---help--- |
e279b6c1 SR |
1802 | Enable console blanking using the APM. Some laptops can use this to |
1803 | turn off the LCD backlight when the screen blanker of the Linux | |
1804 | virtual console blanks the screen. Note that this is only used by | |
1805 | the virtual console screen blanker, and won't turn off the backlight | |
1806 | when using the X Window system. This also doesn't have anything to | |
1807 | do with your VESA-compliant power-saving monitor. Further, this | |
1808 | option doesn't work for all laptops -- it might not turn off your | |
1809 | backlight at all, or it might print a lot of errors to the console, | |
1810 | especially if you are using gpm. | |
1811 | ||
1812 | config APM_ALLOW_INTS | |
1813 | bool "Allow interrupts during APM BIOS calls" | |
8f9ca475 | 1814 | ---help--- |
e279b6c1 SR |
1815 | Normally we disable external interrupts while we are making calls to |
1816 | the APM BIOS as a measure to lessen the effects of a badly behaving | |
1817 | BIOS implementation. The BIOS should reenable interrupts if it | |
1818 | needs to. Unfortunately, some BIOSes do not -- especially those in | |
1819 | many of the newer IBM Thinkpads. If you experience hangs when you | |
1820 | suspend, try setting this to Y. Otherwise, say N. | |
1821 | ||
e279b6c1 SR |
1822 | endif # APM |
1823 | ||
1824 | source "arch/x86/kernel/cpu/cpufreq/Kconfig" | |
1825 | ||
1826 | source "drivers/cpuidle/Kconfig" | |
1827 | ||
27471fdb AH |
1828 | source "drivers/idle/Kconfig" |
1829 | ||
e279b6c1 SR |
1830 | endmenu |
1831 | ||
1832 | ||
1833 | menu "Bus options (PCI etc.)" | |
1834 | ||
1835 | config PCI | |
1ac97018 | 1836 | bool "PCI support" |
1c858087 | 1837 | default y |
e279b6c1 | 1838 | select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC) |
8f9ca475 | 1839 | ---help--- |
e279b6c1 SR |
1840 | Find out whether you have a PCI motherboard. PCI is the name of a |
1841 | bus system, i.e. the way the CPU talks to the other stuff inside | |
1842 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | |
1843 | VESA. If you have PCI, say Y, otherwise N. | |
1844 | ||
e279b6c1 SR |
1845 | choice |
1846 | prompt "PCI access mode" | |
efefa6f6 | 1847 | depends on X86_32 && PCI |
e279b6c1 SR |
1848 | default PCI_GOANY |
1849 | ---help--- | |
1850 | On PCI systems, the BIOS can be used to detect the PCI devices and | |
1851 | determine their configuration. However, some old PCI motherboards | |
1852 | have BIOS bugs and may crash if this is done. Also, some embedded | |
1853 | PCI-based systems don't have any BIOS at all. Linux can also try to | |
1854 | detect the PCI hardware directly without using the BIOS. | |
1855 | ||
1856 | With this option, you can specify how Linux should detect the | |
1857 | PCI devices. If you choose "BIOS", the BIOS will be used, | |
1858 | if you choose "Direct", the BIOS won't be used, and if you | |
1859 | choose "MMConfig", then PCI Express MMCONFIG will be used. | |
1860 | If you choose "Any", the kernel will try MMCONFIG, then the | |
1861 | direct access method and falls back to the BIOS if that doesn't | |
1862 | work. If unsure, go with the default, which is "Any". | |
1863 | ||
1864 | config PCI_GOBIOS | |
1865 | bool "BIOS" | |
1866 | ||
1867 | config PCI_GOMMCONFIG | |
1868 | bool "MMConfig" | |
1869 | ||
1870 | config PCI_GODIRECT | |
1871 | bool "Direct" | |
1872 | ||
3ef0e1f8 | 1873 | config PCI_GOOLPC |
76fb6570 | 1874 | bool "OLPC XO-1" |
3ef0e1f8 AS |
1875 | depends on OLPC |
1876 | ||
2bdd1b03 AS |
1877 | config PCI_GOANY |
1878 | bool "Any" | |
1879 | ||
e279b6c1 SR |
1880 | endchoice |
1881 | ||
1882 | config PCI_BIOS | |
3c2362e6 | 1883 | def_bool y |
efefa6f6 | 1884 | depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY) |
e279b6c1 SR |
1885 | |
1886 | # x86-64 doesn't support PCI BIOS access from long mode so always go direct. | |
1887 | config PCI_DIRECT | |
3c2362e6 | 1888 | def_bool y |
efefa6f6 | 1889 | depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC)) |
e279b6c1 SR |
1890 | |
1891 | config PCI_MMCONFIG | |
3c2362e6 | 1892 | def_bool y |
5f0db7a2 | 1893 | depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY) |
e279b6c1 | 1894 | |
3ef0e1f8 | 1895 | config PCI_OLPC |
2bdd1b03 AS |
1896 | def_bool y |
1897 | depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY) | |
3ef0e1f8 | 1898 | |
e279b6c1 | 1899 | config PCI_DOMAINS |
3c2362e6 | 1900 | def_bool y |
e279b6c1 | 1901 | depends on PCI |
e279b6c1 SR |
1902 | |
1903 | config PCI_MMCONFIG | |
1904 | bool "Support mmconfig PCI config space access" | |
1905 | depends on X86_64 && PCI && ACPI | |
1906 | ||
3f6ea84a IS |
1907 | config PCI_CNB20LE_QUIRK |
1908 | bool "Read CNB20LE Host Bridge Windows" | |
1909 | depends on PCI | |
1910 | help | |
1911 | Read the PCI windows out of the CNB20LE host bridge. This allows | |
1912 | PCI hotplug to work on systems with the CNB20LE chipset which do | |
1913 | not have ACPI. | |
1914 | ||
e279b6c1 SR |
1915 | config DMAR |
1916 | bool "Support for DMA Remapping Devices (EXPERIMENTAL)" | |
4cf2e75d | 1917 | depends on PCI_MSI && ACPI && EXPERIMENTAL |
e279b6c1 SR |
1918 | help |
1919 | DMA remapping (DMAR) devices support enables independent address | |
1920 | translations for Direct Memory Access (DMA) from devices. | |
1921 | These DMA remapping devices are reported via ACPI tables | |
1922 | and include PCI device scope covered by these DMA | |
1923 | remapping devices. | |
1924 | ||
0cd5c3c8 | 1925 | config DMAR_DEFAULT_ON |
f6be37fd | 1926 | def_bool y |
0cd5c3c8 KM |
1927 | prompt "Enable DMA Remapping Devices by default" |
1928 | depends on DMAR | |
1929 | help | |
1930 | Selecting this option will enable a DMAR device at boot time if | |
1931 | one is found. If this option is not selected, DMAR support can | |
1932 | be enabled by passing intel_iommu=on to the kernel. It is | |
1933 | recommended you say N here while the DMAR code remains | |
1934 | experimental. | |
1935 | ||
62edf5dc | 1936 | config DMAR_BROKEN_GFX_WA |
6fc108a0 | 1937 | bool "Workaround broken graphics drivers (going away soon)" |
0c02a20f | 1938 | depends on DMAR && BROKEN |
62edf5dc DW |
1939 | ---help--- |
1940 | Current Graphics drivers tend to use physical address | |
1941 | for DMA and avoid using DMA APIs. Setting this config | |
1942 | option permits the IOMMU driver to set a unity map for | |
1943 | all the OS-visible memory. Hence the driver can continue | |
1944 | to use physical addresses for DMA, at least until this | |
1945 | option is removed in the 2.6.32 kernel. | |
1946 | ||
e279b6c1 | 1947 | config DMAR_FLOPPY_WA |
3c2362e6 | 1948 | def_bool y |
e279b6c1 | 1949 | depends on DMAR |
8f9ca475 | 1950 | ---help--- |
c7ab48d2 | 1951 | Floppy disk drivers are known to bypass DMA API calls |
8f9ca475 IM |
1952 | thereby failing to work when IOMMU is enabled. This |
1953 | workaround will setup a 1:1 mapping for the first | |
c7ab48d2 | 1954 | 16MiB to make floppy (an ISA device) work. |
e279b6c1 | 1955 | |
9fa8c481 SS |
1956 | config INTR_REMAP |
1957 | bool "Support for Interrupt Remapping (EXPERIMENTAL)" | |
1958 | depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL | |
8f9ca475 IM |
1959 | ---help--- |
1960 | Supports Interrupt remapping for IO-APIC and MSI devices. | |
1961 | To use x2apic mode in the CPU's which support x2APIC enhancements or | |
1962 | to support platforms with CPU's having > 8 bit APIC ID, say Y. | |
9fa8c481 | 1963 | |
e279b6c1 SR |
1964 | source "drivers/pci/pcie/Kconfig" |
1965 | ||
1966 | source "drivers/pci/Kconfig" | |
1967 | ||
1968 | # x86_64 have no ISA slots, but do have ISA-style DMA. | |
1969 | config ISA_DMA_API | |
3c2362e6 | 1970 | def_bool y |
e279b6c1 SR |
1971 | |
1972 | if X86_32 | |
1973 | ||
1974 | config ISA | |
1975 | bool "ISA support" | |
8f9ca475 | 1976 | ---help--- |
e279b6c1 SR |
1977 | Find out whether you have ISA slots on your motherboard. ISA is the |
1978 | name of a bus system, i.e. the way the CPU talks to the other stuff | |
1979 | inside your box. Other bus systems are PCI, EISA, MicroChannel | |
1980 | (MCA) or VESA. ISA is an older system, now being displaced by PCI; | |
1981 | newer boards don't support it. If you have ISA, say Y, otherwise N. | |
1982 | ||
1983 | config EISA | |
1984 | bool "EISA support" | |
1985 | depends on ISA | |
1986 | ---help--- | |
1987 | The Extended Industry Standard Architecture (EISA) bus was | |
1988 | developed as an open alternative to the IBM MicroChannel bus. | |
1989 | ||
1990 | The EISA bus provided some of the features of the IBM MicroChannel | |
1991 | bus while maintaining backward compatibility with cards made for | |
1992 | the older ISA bus. The EISA bus saw limited use between 1988 and | |
1993 | 1995 when it was made obsolete by the PCI bus. | |
1994 | ||
1995 | Say Y here if you are building a kernel for an EISA-based machine. | |
1996 | ||
1997 | Otherwise, say N. | |
1998 | ||
1999 | source "drivers/eisa/Kconfig" | |
2000 | ||
2001 | config MCA | |
72ee6ebb | 2002 | bool "MCA support" |
8f9ca475 | 2003 | ---help--- |
e279b6c1 SR |
2004 | MicroChannel Architecture is found in some IBM PS/2 machines and |
2005 | laptops. It is a bus system similar to PCI or ISA. See | |
2006 | <file:Documentation/mca.txt> (and especially the web page given | |
2007 | there) before attempting to build an MCA bus kernel. | |
2008 | ||
2009 | source "drivers/mca/Kconfig" | |
2010 | ||
2011 | config SCx200 | |
2012 | tristate "NatSemi SCx200 support" | |
8f9ca475 | 2013 | ---help--- |
e279b6c1 SR |
2014 | This provides basic support for National Semiconductor's |
2015 | (now AMD's) Geode processors. The driver probes for the | |
2016 | PCI-IDs of several on-chip devices, so its a good dependency | |
2017 | for other scx200_* drivers. | |
2018 | ||
2019 | If compiled as a module, the driver is named scx200. | |
2020 | ||
2021 | config SCx200HR_TIMER | |
2022 | tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" | |
592913ec | 2023 | depends on SCx200 |
e279b6c1 | 2024 | default y |
8f9ca475 | 2025 | ---help--- |
e279b6c1 SR |
2026 | This driver provides a clocksource built upon the on-chip |
2027 | 27MHz high-resolution timer. Its also a workaround for | |
2028 | NSC Geode SC-1100's buggy TSC, which loses time when the | |
2029 | processor goes idle (as is done by the scheduler). The | |
2030 | other workaround is idle=poll boot option. | |
2031 | ||
3ef0e1f8 AS |
2032 | config OLPC |
2033 | bool "One Laptop Per Child support" | |
3c554946 | 2034 | select GPIOLIB |
3e3c4860 | 2035 | select OLPC_OPENFIRMWARE |
8f9ca475 | 2036 | ---help--- |
3ef0e1f8 AS |
2037 | Add support for detecting the unique features of the OLPC |
2038 | XO hardware. | |
2039 | ||
bf1ebf00 DD |
2040 | config OLPC_XO1 |
2041 | tristate "OLPC XO-1 support" | |
9e9006e9 | 2042 | depends on OLPC && PCI |
bf1ebf00 DD |
2043 | ---help--- |
2044 | Add support for non-essential features of the OLPC XO-1 laptop. | |
2045 | ||
fd699c76 AS |
2046 | config OLPC_OPENFIRMWARE |
2047 | bool "Support for OLPC's Open Firmware" | |
2048 | depends on !X86_64 && !X86_PAE | |
3e3c4860 | 2049 | default n |
fd699c76 AS |
2050 | help |
2051 | This option adds support for the implementation of Open Firmware | |
2052 | that is used on the OLPC XO-1 Children's Machine. | |
2053 | If unsure, say N here. | |
2054 | ||
bc0120fd SR |
2055 | endif # X86_32 |
2056 | ||
23ac4ae8 | 2057 | config AMD_NB |
e279b6c1 | 2058 | def_bool y |
0e152cd7 | 2059 | depends on CPU_SUP_AMD && PCI |
e279b6c1 SR |
2060 | |
2061 | source "drivers/pcmcia/Kconfig" | |
2062 | ||
2063 | source "drivers/pci/hotplug/Kconfig" | |
2064 | ||
2065 | endmenu | |
2066 | ||
2067 | ||
2068 | menu "Executable file formats / Emulations" | |
2069 | ||
2070 | source "fs/Kconfig.binfmt" | |
2071 | ||
2072 | config IA32_EMULATION | |
2073 | bool "IA32 Emulation" | |
2074 | depends on X86_64 | |
a97f52e6 | 2075 | select COMPAT_BINFMT_ELF |
8f9ca475 | 2076 | ---help--- |
e279b6c1 SR |
2077 | Include code to run 32-bit programs under a 64-bit kernel. You should |
2078 | likely turn this on, unless you're 100% sure that you don't have any | |
2079 | 32-bit programs left. | |
2080 | ||
2081 | config IA32_AOUT | |
8f9ca475 IM |
2082 | tristate "IA32 a.out support" |
2083 | depends on IA32_EMULATION | |
2084 | ---help--- | |
2085 | Support old a.out binaries in the 32bit emulation. | |
e279b6c1 SR |
2086 | |
2087 | config COMPAT | |
3c2362e6 | 2088 | def_bool y |
e279b6c1 | 2089 | depends on IA32_EMULATION |
e279b6c1 SR |
2090 | |
2091 | config COMPAT_FOR_U64_ALIGNMENT | |
2092 | def_bool COMPAT | |
2093 | depends on X86_64 | |
2094 | ||
2095 | config SYSVIPC_COMPAT | |
3c2362e6 | 2096 | def_bool y |
b8992195 | 2097 | depends on COMPAT && SYSVIPC |
e279b6c1 SR |
2098 | |
2099 | endmenu | |
2100 | ||
2101 | ||
e5beae16 KP |
2102 | config HAVE_ATOMIC_IOMAP |
2103 | def_bool y | |
2104 | depends on X86_32 | |
2105 | ||
3cba11d3 MH |
2106 | config HAVE_TEXT_POKE_SMP |
2107 | bool | |
2108 | select STOP_MACHINE if SMP | |
2109 | ||
e279b6c1 SR |
2110 | source "net/Kconfig" |
2111 | ||
2112 | source "drivers/Kconfig" | |
2113 | ||
2114 | source "drivers/firmware/Kconfig" | |
2115 | ||
2116 | source "fs/Kconfig" | |
2117 | ||
e279b6c1 SR |
2118 | source "arch/x86/Kconfig.debug" |
2119 | ||
2120 | source "security/Kconfig" | |
2121 | ||
2122 | source "crypto/Kconfig" | |
2123 | ||
edf88417 AK |
2124 | source "arch/x86/kvm/Kconfig" |
2125 | ||
e279b6c1 | 2126 | source "lib/Kconfig" |