Kconfig 70 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041104210431044104510461047104810491050105110521053105410551056105710581059106010611062106310641065106610671068106910701071107210731074107510761077107810791080108110821083108410851086108710881089109010911092109310941095109610971098109911001101110211031104110511061107110811091110111111121113111411151116111711181119112011211122112311241125112611271128112911301131113211331134113511361137113811391140114111421143114411451146114711481149115011511152115311541155115611571158115911601161116211631164116511661167116811691170117111721173117411751176117711781179118011811182118311841185118611871188118911901191119211931194119511961197119811991200120112021203120412051206120712081209121012111212121312141215121612171218121912201221122212231224122512261227122812291230123112321233123412351236123712381239124012411242124312441245124612471248124912501251125212531254125512561257125812591260126112621263126412651266126712681269127012711272127312741275127612771278127912801281128212831284128512861287128812891290129112921293129412951296129712981299130013011302130313041305130613071308130913101311131213131314131513161317131813191320132113221323132413251326132713281329133013311332133313341335133613371338133913401341134213431344134513461347134813491350135113521353135413551356135713581359136013611362136313641365136613671368136913701371137213731374137513761377137813791380138113821383138413851386138713881389139013911392139313941395139613971398139914001401140214031404140514061407140814091410141114121413141414151416141714181419142014211422142314241425142614271428142914301431143214331434143514361437143814391440144114421443144414451446144714481449145014511452145314541455145614571458145914601461146214631464146514661467146814691470147114721473147414751476147714781479148014811482148314841485148614871488148914901491149214931494149514961497149814991500150115021503150415051506150715081509151015111512151315141515151615171518151915201521152215231524152515261527152815291530153115321533153415351536153715381539154015411542154315441545154615471548154915501551155215531554155515561557155815591560156115621563156415651566156715681569157015711572157315741575157615771578157915801581158215831584158515861587158815891590159115921593159415951596159715981599160016011602160316041605160616071608160916101611161216131614161516161617161816191620162116221623162416251626162716281629163016311632163316341635163616371638163916401641164216431644164516461647164816491650165116521653165416551656165716581659166016611662166316641665166616671668166916701671167216731674167516761677167816791680168116821683168416851686168716881689169016911692169316941695169616971698169917001701170217031704170517061707170817091710171117121713171417151716171717181719172017211722172317241725172617271728172917301731173217331734173517361737173817391740174117421743174417451746174717481749175017511752175317541755175617571758175917601761176217631764176517661767176817691770177117721773177417751776177717781779178017811782178317841785178617871788178917901791179217931794179517961797179817991800180118021803180418051806180718081809181018111812181318141815181618171818181918201821182218231824182518261827182818291830183118321833183418351836183718381839184018411842184318441845184618471848184918501851185218531854185518561857185818591860186118621863186418651866186718681869187018711872187318741875187618771878187918801881188218831884188518861887188818891890189118921893189418951896189718981899190019011902190319041905190619071908190919101911191219131914191519161917191819191920192119221923192419251926192719281929193019311932193319341935193619371938193919401941194219431944194519461947194819491950195119521953195419551956195719581959196019611962196319641965196619671968196919701971197219731974197519761977197819791980198119821983198419851986198719881989199019911992199319941995199619971998199920002001200220032004200520062007200820092010201120122013201420152016201720182019202020212022202320242025202620272028202920302031203220332034203520362037203820392040204120422043204420452046204720482049205020512052205320542055205620572058205920602061206220632064206520662067206820692070207120722073207420752076207720782079208020812082208320842085208620872088208920902091209220932094209520962097209820992100210121022103210421052106210721082109211021112112211321142115211621172118211921202121212221232124212521262127212821292130213121322133213421352136213721382139214021412142214321442145214621472148214921502151215221532154215521562157215821592160216121622163216421652166216721682169217021712172217321742175217621772178217921802181218221832184218521862187218821892190219121922193219421952196219721982199220022012202220322042205220622072208220922102211221222132214221522162217221822192220222122222223222422252226
  1. # Select 32 or 64 bit
  2. config 64BIT
  3. bool "64-bit kernel" if ARCH = "x86"
  4. default ARCH = "x86_64"
  5. ---help---
  6. Say yes to build a 64-bit kernel - formerly known as x86_64
  7. Say no to build a 32-bit kernel - formerly known as i386
  8. config X86_32
  9. def_bool !64BIT
  10. select CLKSRC_I8253
  11. config X86_64
  12. def_bool 64BIT
  13. ### Arch settings
  14. config X86
  15. def_bool y
  16. select HAVE_AOUT if X86_32
  17. select HAVE_UNSTABLE_SCHED_CLOCK
  18. select HAVE_IDE
  19. select HAVE_OPROFILE
  20. select HAVE_PCSPKR_PLATFORM
  21. select HAVE_PERF_EVENTS
  22. select HAVE_IRQ_WORK
  23. select HAVE_IOREMAP_PROT
  24. select HAVE_KPROBES
  25. select HAVE_MEMBLOCK
  26. select HAVE_MEMBLOCK_NODE_MAP
  27. select ARCH_DISCARD_MEMBLOCK
  28. select ARCH_WANT_OPTIONAL_GPIOLIB
  29. select ARCH_WANT_FRAME_POINTERS
  30. select HAVE_DMA_ATTRS
  31. select HAVE_KRETPROBES
  32. select HAVE_OPTPROBES
  33. select HAVE_FTRACE_MCOUNT_RECORD
  34. select HAVE_C_RECORDMCOUNT
  35. select HAVE_DYNAMIC_FTRACE
  36. select HAVE_FUNCTION_TRACER
  37. select HAVE_FUNCTION_GRAPH_TRACER
  38. select HAVE_FUNCTION_GRAPH_FP_TEST
  39. select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  40. select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE
  41. select HAVE_SYSCALL_TRACEPOINTS
  42. select HAVE_KVM
  43. select HAVE_ARCH_KGDB
  44. select HAVE_ARCH_TRACEHOOK
  45. select HAVE_GENERIC_DMA_COHERENT if X86_32
  46. select HAVE_EFFICIENT_UNALIGNED_ACCESS
  47. select USER_STACKTRACE_SUPPORT
  48. select HAVE_REGS_AND_STACK_ACCESS_API
  49. select HAVE_DMA_API_DEBUG
  50. select HAVE_KERNEL_GZIP
  51. select HAVE_KERNEL_BZIP2
  52. select HAVE_KERNEL_LZMA
  53. select HAVE_KERNEL_XZ
  54. select HAVE_KERNEL_LZO
  55. select HAVE_HW_BREAKPOINT
  56. select HAVE_MIXED_BREAKPOINTS_REGS
  57. select PERF_EVENTS
  58. select HAVE_PERF_EVENTS_NMI
  59. select ANON_INODES
  60. select HAVE_ALIGNED_STRUCT_PAGE if SLUB && !M386
  61. select HAVE_CMPXCHG_LOCAL if !M386
  62. select HAVE_CMPXCHG_DOUBLE
  63. select HAVE_ARCH_KMEMCHECK
  64. select HAVE_USER_RETURN_NOTIFIER
  65. select ARCH_BINFMT_ELF_RANDOMIZE_PIE
  66. select HAVE_ARCH_JUMP_LABEL
  67. select HAVE_TEXT_POKE_SMP
  68. select HAVE_GENERIC_HARDIRQS
  69. select HAVE_SPARSE_IRQ
  70. select SPARSE_IRQ
  71. select GENERIC_FIND_FIRST_BIT
  72. select GENERIC_IRQ_PROBE
  73. select GENERIC_PENDING_IRQ if SMP
  74. select GENERIC_IRQ_SHOW
  75. select GENERIC_CLOCKEVENTS_MIN_ADJUST
  76. select IRQ_FORCED_THREADING
  77. select USE_GENERIC_SMP_HELPERS if SMP
  78. select HAVE_BPF_JIT if (X86_64 && NET)
  79. select CLKEVT_I8253
  80. select ARCH_HAVE_NMI_SAFE_CMPXCHG
  81. select GENERIC_IOMAP
  82. config INSTRUCTION_DECODER
  83. def_bool (KPROBES || PERF_EVENTS)
  84. config OUTPUT_FORMAT
  85. string
  86. default "elf32-i386" if X86_32
  87. default "elf64-x86-64" if X86_64
  88. config ARCH_DEFCONFIG
  89. string
  90. default "arch/x86/configs/i386_defconfig" if X86_32
  91. default "arch/x86/configs/x86_64_defconfig" if X86_64
  92. config GENERIC_CMOS_UPDATE
  93. def_bool y
  94. config CLOCKSOURCE_WATCHDOG
  95. def_bool y
  96. config GENERIC_CLOCKEVENTS
  97. def_bool y
  98. config ARCH_CLOCKSOURCE_DATA
  99. def_bool y
  100. depends on X86_64
  101. config GENERIC_CLOCKEVENTS_BROADCAST
  102. def_bool y
  103. depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
  104. config LOCKDEP_SUPPORT
  105. def_bool y
  106. config STACKTRACE_SUPPORT
  107. def_bool y
  108. config HAVE_LATENCYTOP_SUPPORT
  109. def_bool y
  110. config MMU
  111. def_bool y
  112. config SBUS
  113. bool
  114. config NEED_DMA_MAP_STATE
  115. def_bool (X86_64 || INTEL_IOMMU || DMA_API_DEBUG)
  116. config NEED_SG_DMA_LENGTH
  117. def_bool y
  118. config GENERIC_ISA_DMA
  119. def_bool ISA_DMA_API
  120. config GENERIC_BUG
  121. def_bool y
  122. depends on BUG
  123. select GENERIC_BUG_RELATIVE_POINTERS if X86_64
  124. config GENERIC_BUG_RELATIVE_POINTERS
  125. bool
  126. config GENERIC_HWEIGHT
  127. def_bool y
  128. config GENERIC_GPIO
  129. bool
  130. config ARCH_MAY_HAVE_PC_FDC
  131. def_bool ISA_DMA_API
  132. config RWSEM_GENERIC_SPINLOCK
  133. def_bool !X86_XADD
  134. config RWSEM_XCHGADD_ALGORITHM
  135. def_bool X86_XADD
  136. config ARCH_HAS_CPU_IDLE_WAIT
  137. def_bool y
  138. config GENERIC_CALIBRATE_DELAY
  139. def_bool y
  140. config GENERIC_TIME_VSYSCALL
  141. bool
  142. default X86_64
  143. config ARCH_HAS_CPU_RELAX
  144. def_bool y
  145. config ARCH_HAS_DEFAULT_IDLE
  146. def_bool y
  147. config ARCH_HAS_CACHE_LINE_SIZE
  148. def_bool y
  149. config ARCH_HAS_CPU_AUTOPROBE
  150. def_bool y
  151. config HAVE_SETUP_PER_CPU_AREA
  152. def_bool y
  153. config NEED_PER_CPU_EMBED_FIRST_CHUNK
  154. def_bool y
  155. config NEED_PER_CPU_PAGE_FIRST_CHUNK
  156. def_bool y
  157. config ARCH_HIBERNATION_POSSIBLE
  158. def_bool y
  159. config ARCH_SUSPEND_POSSIBLE
  160. def_bool y
  161. config ZONE_DMA32
  162. bool
  163. default X86_64
  164. config AUDIT_ARCH
  165. bool
  166. default X86_64
  167. config ARCH_SUPPORTS_OPTIMIZED_INLINING
  168. def_bool y
  169. config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  170. def_bool y
  171. config HAVE_INTEL_TXT
  172. def_bool y
  173. depends on EXPERIMENTAL && INTEL_IOMMU && ACPI
  174. config X86_32_SMP
  175. def_bool y
  176. depends on X86_32 && SMP
  177. config X86_64_SMP
  178. def_bool y
  179. depends on X86_64 && SMP
  180. config X86_HT
  181. def_bool y
  182. depends on SMP
  183. config X86_32_LAZY_GS
  184. def_bool y
  185. depends on X86_32 && !CC_STACKPROTECTOR
  186. config ARCH_HWEIGHT_CFLAGS
  187. string
  188. default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
  189. 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
  190. config KTIME_SCALAR
  191. def_bool X86_32
  192. config ARCH_CPU_PROBE_RELEASE
  193. def_bool y
  194. depends on HOTPLUG_CPU
  195. source "init/Kconfig"
  196. source "kernel/Kconfig.freezer"
  197. menu "Processor type and features"
  198. config ZONE_DMA
  199. bool "DMA memory allocation support" if EXPERT
  200. default y
  201. help
  202. DMA memory allocation support allows devices with less than 32-bit
  203. addressing to allocate within the first 16MB of address space.
  204. Disable if no such devices will be used.
  205. If unsure, say Y.
  206. source "kernel/time/Kconfig"
  207. config SMP
  208. bool "Symmetric multi-processing support"
  209. ---help---
  210. This enables support for systems with more than one CPU. If you have
  211. a system with only one CPU, like most personal computers, say N. If
  212. you have a system with more than one CPU, say Y.
  213. If you say N here, the kernel will run on single and multiprocessor
  214. machines, but will use only one CPU of a multiprocessor machine. If
  215. you say Y here, the kernel will run on many, but not all,
  216. singleprocessor machines. On a singleprocessor machine, the kernel
  217. will run faster if you say N here.
  218. Note that if you say Y here and choose architecture "586" or
  219. "Pentium" under "Processor family", the kernel will not work on 486
  220. architectures. Similarly, multiprocessor kernels for the "PPro"
  221. architecture may not work on all Pentium based boards.
  222. People using multiprocessor machines who say Y here should also say
  223. Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
  224. Management" code will be disabled if you say Y here.
  225. See also <file:Documentation/x86/i386/IO-APIC.txt>,
  226. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  227. <http://www.tldp.org/docs.html#howto>.
  228. If you don't know what to do here, say N.
  229. config X86_X2APIC
  230. bool "Support x2apic"
  231. depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
  232. ---help---
  233. This enables x2apic support on CPUs that have this feature.
  234. This allows 32-bit apic IDs (so it can support very large systems),
  235. and accesses the local apic via MSRs not via mmio.
  236. If you don't know what to do here, say N.
  237. config X86_MPPARSE
  238. bool "Enable MPS table" if ACPI
  239. default y
  240. depends on X86_LOCAL_APIC
  241. ---help---
  242. For old smp systems that do not have proper acpi support. Newer systems
  243. (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
  244. config X86_BIGSMP
  245. bool "Support for big SMP systems with more than 8 CPUs"
  246. depends on X86_32 && SMP
  247. ---help---
  248. This option is needed for the systems that have more than 8 CPUs
  249. if X86_32
  250. config X86_EXTENDED_PLATFORM
  251. bool "Support for extended (non-PC) x86 platforms"
  252. default y
  253. ---help---
  254. If you disable this option then the kernel will only support
  255. standard PC platforms. (which covers the vast majority of
  256. systems out there.)
  257. If you enable this option then you'll be able to select support
  258. for the following (non-PC) 32 bit x86 platforms:
  259. AMD Elan
  260. NUMAQ (IBM/Sequent)
  261. RDC R-321x SoC
  262. SGI 320/540 (Visual Workstation)
  263. Summit/EXA (IBM x440)
  264. Unisys ES7000 IA32 series
  265. Moorestown MID devices
  266. If you have one of these systems, or if you want to build a
  267. generic distribution kernel, say Y here - otherwise say N.
  268. endif
  269. if X86_64
  270. config X86_EXTENDED_PLATFORM
  271. bool "Support for extended (non-PC) x86 platforms"
  272. default y
  273. ---help---
  274. If you disable this option then the kernel will only support
  275. standard PC platforms. (which covers the vast majority of
  276. systems out there.)
  277. If you enable this option then you'll be able to select support
  278. for the following (non-PC) 64 bit x86 platforms:
  279. Numascale NumaChip
  280. ScaleMP vSMP
  281. SGI Ultraviolet
  282. If you have one of these systems, or if you want to build a
  283. generic distribution kernel, say Y here - otherwise say N.
  284. endif
  285. # This is an alphabetically sorted list of 64 bit extended platforms
  286. # Please maintain the alphabetic order if and when there are additions
  287. config X86_NUMACHIP
  288. bool "Numascale NumaChip"
  289. depends on X86_64
  290. depends on X86_EXTENDED_PLATFORM
  291. depends on NUMA
  292. depends on SMP
  293. depends on X86_X2APIC
  294. depends on !EDAC_AMD64
  295. ---help---
  296. Adds support for Numascale NumaChip large-SMP systems. Needed to
  297. enable more than ~168 cores.
  298. If you don't have one of these, you should say N here.
  299. config X86_VSMP
  300. bool "ScaleMP vSMP"
  301. select PARAVIRT_GUEST
  302. select PARAVIRT
  303. depends on X86_64 && PCI
  304. depends on X86_EXTENDED_PLATFORM
  305. ---help---
  306. Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
  307. supposed to run on these EM64T-based machines. Only choose this option
  308. if you have one of these machines.
  309. config X86_UV
  310. bool "SGI Ultraviolet"
  311. depends on X86_64
  312. depends on X86_EXTENDED_PLATFORM
  313. depends on NUMA
  314. depends on X86_X2APIC
  315. ---help---
  316. This option is needed in order to support SGI Ultraviolet systems.
  317. If you don't have one of these, you should say N here.
  318. # Following is an alphabetically sorted list of 32 bit extended platforms
  319. # Please maintain the alphabetic order if and when there are additions
  320. config X86_INTEL_CE
  321. bool "CE4100 TV platform"
  322. depends on PCI
  323. depends on PCI_GODIRECT
  324. depends on X86_32
  325. depends on X86_EXTENDED_PLATFORM
  326. select X86_REBOOTFIXUPS
  327. select OF
  328. select OF_EARLY_FLATTREE
  329. ---help---
  330. Select for the Intel CE media processor (CE4100) SOC.
  331. This option compiles in support for the CE4100 SOC for settop
  332. boxes and media devices.
  333. config X86_WANT_INTEL_MID
  334. bool "Intel MID platform support"
  335. depends on X86_32
  336. depends on X86_EXTENDED_PLATFORM
  337. ---help---
  338. Select to build a kernel capable of supporting Intel MID platform
  339. systems which do not have the PCI legacy interfaces (Moorestown,
  340. Medfield). If you are building for a PC class system say N here.
  341. if X86_WANT_INTEL_MID
  342. config X86_INTEL_MID
  343. bool
  344. config X86_MRST
  345. bool "Moorestown MID platform"
  346. depends on PCI
  347. depends on PCI_GOANY
  348. depends on X86_IO_APIC
  349. select X86_INTEL_MID
  350. select SFI
  351. select DW_APB_TIMER
  352. select APB_TIMER
  353. select I2C
  354. select SPI
  355. select INTEL_SCU_IPC
  356. select X86_PLATFORM_DEVICES
  357. ---help---
  358. Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
  359. Internet Device(MID) platform. Moorestown consists of two chips:
  360. Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
  361. Unlike standard x86 PCs, Moorestown does not have many legacy devices
  362. nor standard legacy replacement devices/features. e.g. Moorestown does
  363. not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
  364. config X86_MDFLD
  365. bool "Medfield MID platform"
  366. depends on PCI
  367. depends on PCI_GOANY
  368. depends on X86_IO_APIC
  369. select X86_INTEL_MID
  370. select SFI
  371. select DW_APB_TIMER
  372. select APB_TIMER
  373. select I2C
  374. select SPI
  375. select INTEL_SCU_IPC
  376. select X86_PLATFORM_DEVICES
  377. ---help---
  378. Medfield is Intel's Low Power Intel Architecture (LPIA) based Moblin
  379. Internet Device(MID) platform.
  380. Unlike standard x86 PCs, Medfield does not have many legacy devices
  381. nor standard legacy replacement devices/features. e.g. Medfield does
  382. not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
  383. endif
  384. config X86_RDC321X
  385. bool "RDC R-321x SoC"
  386. depends on X86_32
  387. depends on X86_EXTENDED_PLATFORM
  388. select M486
  389. select X86_REBOOTFIXUPS
  390. ---help---
  391. This option is needed for RDC R-321x system-on-chip, also known
  392. as R-8610-(G).
  393. If you don't have one of these chips, you should say N here.
  394. config X86_32_NON_STANDARD
  395. bool "Support non-standard 32-bit SMP architectures"
  396. depends on X86_32 && SMP
  397. depends on X86_EXTENDED_PLATFORM
  398. ---help---
  399. This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
  400. subarchitectures. It is intended for a generic binary kernel.
  401. if you select them all, kernel will probe it one by one. and will
  402. fallback to default.
  403. # Alphabetically sorted list of Non standard 32 bit platforms
  404. config X86_NUMAQ
  405. bool "NUMAQ (IBM/Sequent)"
  406. depends on X86_32_NON_STANDARD
  407. depends on PCI
  408. select NUMA
  409. select X86_MPPARSE
  410. ---help---
  411. This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
  412. NUMA multiquad box. This changes the way that processors are
  413. bootstrapped, and uses Clustered Logical APIC addressing mode instead
  414. of Flat Logical. You will need a new lynxer.elf file to flash your
  415. firmware with - send email to <Martin.Bligh@us.ibm.com>.
  416. config X86_SUPPORTS_MEMORY_FAILURE
  417. def_bool y
  418. # MCE code calls memory_failure():
  419. depends on X86_MCE
  420. # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
  421. depends on !X86_NUMAQ
  422. # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
  423. depends on X86_64 || !SPARSEMEM
  424. select ARCH_SUPPORTS_MEMORY_FAILURE
  425. config X86_VISWS
  426. bool "SGI 320/540 (Visual Workstation)"
  427. depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
  428. depends on X86_32_NON_STANDARD
  429. ---help---
  430. The SGI Visual Workstation series is an IA32-based workstation
  431. based on SGI systems chips with some legacy PC hardware attached.
  432. Say Y here to create a kernel to run on the SGI 320 or 540.
  433. A kernel compiled for the Visual Workstation will run on general
  434. PCs as well. See <file:Documentation/sgi-visws.txt> for details.
  435. config X86_SUMMIT
  436. bool "Summit/EXA (IBM x440)"
  437. depends on X86_32_NON_STANDARD
  438. ---help---
  439. This option is needed for IBM systems that use the Summit/EXA chipset.
  440. In particular, it is needed for the x440.
  441. config X86_ES7000
  442. bool "Unisys ES7000 IA32 series"
  443. depends on X86_32_NON_STANDARD && X86_BIGSMP
  444. ---help---
  445. Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
  446. supposed to run on an IA32-based Unisys ES7000 system.
  447. config X86_32_IRIS
  448. tristate "Eurobraille/Iris poweroff module"
  449. depends on X86_32
  450. ---help---
  451. The Iris machines from EuroBraille do not have APM or ACPI support
  452. to shut themselves down properly. A special I/O sequence is
  453. needed to do so, which is what this module does at
  454. kernel shutdown.
  455. This is only for Iris machines from EuroBraille.
  456. If unused, say N.
  457. config SCHED_OMIT_FRAME_POINTER
  458. def_bool y
  459. prompt "Single-depth WCHAN output"
  460. depends on X86
  461. ---help---
  462. Calculate simpler /proc/<PID>/wchan values. If this option
  463. is disabled then wchan values will recurse back to the
  464. caller function. This provides more accurate wchan values,
  465. at the expense of slightly more scheduling overhead.
  466. If in doubt, say "Y".
  467. menuconfig PARAVIRT_GUEST
  468. bool "Paravirtualized guest support"
  469. ---help---
  470. Say Y here to get to see options related to running Linux under
  471. various hypervisors. This option alone does not add any kernel code.
  472. If you say N, all options in this submenu will be skipped and disabled.
  473. if PARAVIRT_GUEST
  474. config PARAVIRT_TIME_ACCOUNTING
  475. bool "Paravirtual steal time accounting"
  476. select PARAVIRT
  477. default n
  478. ---help---
  479. Select this option to enable fine granularity task steal time
  480. accounting. Time spent executing other tasks in parallel with
  481. the current vCPU is discounted from the vCPU power. To account for
  482. that, there can be a small performance impact.
  483. If in doubt, say N here.
  484. source "arch/x86/xen/Kconfig"
  485. config KVM_CLOCK
  486. bool "KVM paravirtualized clock"
  487. select PARAVIRT
  488. select PARAVIRT_CLOCK
  489. ---help---
  490. Turning on this option will allow you to run a paravirtualized clock
  491. when running over the KVM hypervisor. Instead of relying on a PIT
  492. (or probably other) emulation by the underlying device model, the host
  493. provides the guest with timing infrastructure such as time of day, and
  494. system time
  495. config KVM_GUEST
  496. bool "KVM Guest support"
  497. select PARAVIRT
  498. ---help---
  499. This option enables various optimizations for running under the KVM
  500. hypervisor.
  501. source "arch/x86/lguest/Kconfig"
  502. config PARAVIRT
  503. bool "Enable paravirtualization code"
  504. ---help---
  505. This changes the kernel so it can modify itself when it is run
  506. under a hypervisor, potentially improving performance significantly
  507. over full virtualization. However, when run without a hypervisor
  508. the kernel is theoretically slower and slightly larger.
  509. config PARAVIRT_SPINLOCKS
  510. bool "Paravirtualization layer for spinlocks"
  511. depends on PARAVIRT && SMP && EXPERIMENTAL
  512. ---help---
  513. Paravirtualized spinlocks allow a pvops backend to replace the
  514. spinlock implementation with something virtualization-friendly
  515. (for example, block the virtual CPU rather than spinning).
  516. Unfortunately the downside is an up to 5% performance hit on
  517. native kernels, with various workloads.
  518. If you are unsure how to answer this question, answer N.
  519. config PARAVIRT_CLOCK
  520. bool
  521. endif
  522. config PARAVIRT_DEBUG
  523. bool "paravirt-ops debugging"
  524. depends on PARAVIRT && DEBUG_KERNEL
  525. ---help---
  526. Enable to debug paravirt_ops internals. Specifically, BUG if
  527. a paravirt_op is missing when it is called.
  528. config NO_BOOTMEM
  529. def_bool y
  530. config MEMTEST
  531. bool "Memtest"
  532. ---help---
  533. This option adds a kernel parameter 'memtest', which allows memtest
  534. to be set.
  535. memtest=0, mean disabled; -- default
  536. memtest=1, mean do 1 test pattern;
  537. ...
  538. memtest=4, mean do 4 test patterns.
  539. If you are unsure how to answer this question, answer N.
  540. config X86_SUMMIT_NUMA
  541. def_bool y
  542. depends on X86_32 && NUMA && X86_32_NON_STANDARD
  543. config X86_CYCLONE_TIMER
  544. def_bool y
  545. depends on X86_SUMMIT
  546. source "arch/x86/Kconfig.cpu"
  547. config HPET_TIMER
  548. def_bool X86_64
  549. prompt "HPET Timer Support" if X86_32
  550. ---help---
  551. Use the IA-PC HPET (High Precision Event Timer) to manage
  552. time in preference to the PIT and RTC, if a HPET is
  553. present.
  554. HPET is the next generation timer replacing legacy 8254s.
  555. The HPET provides a stable time base on SMP
  556. systems, unlike the TSC, but it is more expensive to access,
  557. as it is off-chip. You can find the HPET spec at
  558. <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
  559. You can safely choose Y here. However, HPET will only be
  560. activated if the platform and the BIOS support this feature.
  561. Otherwise the 8254 will be used for timing services.
  562. Choose N to continue using the legacy 8254 timer.
  563. config HPET_EMULATE_RTC
  564. def_bool y
  565. depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
  566. config APB_TIMER
  567. def_bool y if X86_INTEL_MID
  568. prompt "Intel MID APB Timer Support" if X86_INTEL_MID
  569. select DW_APB_TIMER
  570. depends on X86_INTEL_MID && SFI
  571. help
  572. APB timer is the replacement for 8254, HPET on X86 MID platforms.
  573. The APBT provides a stable time base on SMP
  574. systems, unlike the TSC, but it is more expensive to access,
  575. as it is off-chip. APB timers are always running regardless of CPU
  576. C states, they are used as per CPU clockevent device when possible.
  577. # Mark as expert because too many people got it wrong.
  578. # The code disables itself when not needed.
  579. config DMI
  580. default y
  581. bool "Enable DMI scanning" if EXPERT
  582. ---help---
  583. Enabled scanning of DMI to identify machine quirks. Say Y
  584. here unless you have verified that your setup is not
  585. affected by entries in the DMI blacklist. Required by PNP
  586. BIOS code.
  587. config GART_IOMMU
  588. bool "GART IOMMU support" if EXPERT
  589. default y
  590. select SWIOTLB
  591. depends on X86_64 && PCI && AMD_NB
  592. ---help---
  593. Support for full DMA access of devices with 32bit memory access only
  594. on systems with more than 3GB. This is usually needed for USB,
  595. sound, many IDE/SATA chipsets and some other devices.
  596. Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
  597. based hardware IOMMU and a software bounce buffer based IOMMU used
  598. on Intel systems and as fallback.
  599. The code is only active when needed (enough memory and limited
  600. device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
  601. too.
  602. config CALGARY_IOMMU
  603. bool "IBM Calgary IOMMU support"
  604. select SWIOTLB
  605. depends on X86_64 && PCI && EXPERIMENTAL
  606. ---help---
  607. Support for hardware IOMMUs in IBM's xSeries x366 and x460
  608. systems. Needed to run systems with more than 3GB of memory
  609. properly with 32-bit PCI devices that do not support DAC
  610. (Double Address Cycle). Calgary also supports bus level
  611. isolation, where all DMAs pass through the IOMMU. This
  612. prevents them from going anywhere except their intended
  613. destination. This catches hard-to-find kernel bugs and
  614. mis-behaving drivers and devices that do not use the DMA-API
  615. properly to set up their DMA buffers. The IOMMU can be
  616. turned off at boot time with the iommu=off parameter.
  617. Normally the kernel will make the right choice by itself.
  618. If unsure, say Y.
  619. config CALGARY_IOMMU_ENABLED_BY_DEFAULT
  620. def_bool y
  621. prompt "Should Calgary be enabled by default?"
  622. depends on CALGARY_IOMMU
  623. ---help---
  624. Should Calgary be enabled by default? if you choose 'y', Calgary
  625. will be used (if it exists). If you choose 'n', Calgary will not be
  626. used even if it exists. If you choose 'n' and would like to use
  627. Calgary anyway, pass 'iommu=calgary' on the kernel command line.
  628. If unsure, say Y.
  629. # need this always selected by IOMMU for the VIA workaround
  630. config SWIOTLB
  631. def_bool y if X86_64
  632. ---help---
  633. Support for software bounce buffers used on x86-64 systems
  634. which don't have a hardware IOMMU (e.g. the current generation
  635. of Intel's x86-64 CPUs). Using this PCI devices which can only
  636. access 32-bits of memory can be used on systems with more than
  637. 3 GB of memory. If unsure, say Y.
  638. config IOMMU_HELPER
  639. def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
  640. config MAXSMP
  641. bool "Enable Maximum number of SMP Processors and NUMA Nodes"
  642. depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
  643. select CPUMASK_OFFSTACK
  644. ---help---
  645. Enable maximum number of CPUS and NUMA Nodes for this architecture.
  646. If unsure, say N.
  647. config NR_CPUS
  648. int "Maximum number of CPUs" if SMP && !MAXSMP
  649. range 2 8 if SMP && X86_32 && !X86_BIGSMP
  650. range 2 512 if SMP && !MAXSMP
  651. default "1" if !SMP
  652. default "4096" if MAXSMP
  653. default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
  654. default "8" if SMP
  655. ---help---
  656. This allows you to specify the maximum number of CPUs which this
  657. kernel will support. The maximum supported value is 512 and the
  658. minimum value which makes sense is 2.
  659. This is purely to save memory - each supported CPU adds
  660. approximately eight kilobytes to the kernel image.
  661. config SCHED_SMT
  662. bool "SMT (Hyperthreading) scheduler support"
  663. depends on X86_HT
  664. ---help---
  665. SMT scheduler support improves the CPU scheduler's decision making
  666. when dealing with Intel Pentium 4 chips with HyperThreading at a
  667. cost of slightly increased overhead in some places. If unsure say
  668. N here.
  669. config SCHED_MC
  670. def_bool y
  671. prompt "Multi-core scheduler support"
  672. depends on X86_HT
  673. ---help---
  674. Multi-core scheduler support improves the CPU scheduler's decision
  675. making when dealing with multi-core CPU chips at a cost of slightly
  676. increased overhead in some places. If unsure say N here.
  677. config IRQ_TIME_ACCOUNTING
  678. bool "Fine granularity task level IRQ time accounting"
  679. default n
  680. ---help---
  681. Select this option to enable fine granularity task irq time
  682. accounting. This is done by reading a timestamp on each
  683. transitions between softirq and hardirq state, so there can be a
  684. small performance impact.
  685. If in doubt, say N here.
  686. source "kernel/Kconfig.preempt"
  687. config X86_UP_APIC
  688. bool "Local APIC support on uniprocessors"
  689. depends on X86_32 && !SMP && !X86_32_NON_STANDARD
  690. ---help---
  691. A local APIC (Advanced Programmable Interrupt Controller) is an
  692. integrated interrupt controller in the CPU. If you have a single-CPU
  693. system which has a processor with a local APIC, you can say Y here to
  694. enable and use it. If you say Y here even though your machine doesn't
  695. have a local APIC, then the kernel will still run with no slowdown at
  696. all. The local APIC supports CPU-generated self-interrupts (timer,
  697. performance counters), and the NMI watchdog which detects hard
  698. lockups.
  699. config X86_UP_IOAPIC
  700. bool "IO-APIC support on uniprocessors"
  701. depends on X86_UP_APIC
  702. ---help---
  703. An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
  704. SMP-capable replacement for PC-style interrupt controllers. Most
  705. SMP systems and many recent uniprocessor systems have one.
  706. If you have a single-CPU system with an IO-APIC, you can say Y here
  707. to use it. If you say Y here even though your machine doesn't have
  708. an IO-APIC, then the kernel will still run with no slowdown at all.
  709. config X86_LOCAL_APIC
  710. def_bool y
  711. depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
  712. config X86_IO_APIC
  713. def_bool y
  714. depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
  715. config X86_VISWS_APIC
  716. def_bool y
  717. depends on X86_32 && X86_VISWS
  718. config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
  719. bool "Reroute for broken boot IRQs"
  720. depends on X86_IO_APIC
  721. ---help---
  722. This option enables a workaround that fixes a source of
  723. spurious interrupts. This is recommended when threaded
  724. interrupt handling is used on systems where the generation of
  725. superfluous "boot interrupts" cannot be disabled.
  726. Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
  727. entry in the chipset's IO-APIC is masked (as, e.g. the RT
  728. kernel does during interrupt handling). On chipsets where this
  729. boot IRQ generation cannot be disabled, this workaround keeps
  730. the original IRQ line masked so that only the equivalent "boot
  731. IRQ" is delivered to the CPUs. The workaround also tells the
  732. kernel to set up the IRQ handler on the boot IRQ line. In this
  733. way only one interrupt is delivered to the kernel. Otherwise
  734. the spurious second interrupt may cause the kernel to bring
  735. down (vital) interrupt lines.
  736. Only affects "broken" chipsets. Interrupt sharing may be
  737. increased on these systems.
  738. config X86_MCE
  739. bool "Machine Check / overheating reporting"
  740. ---help---
  741. Machine Check support allows the processor to notify the
  742. kernel if it detects a problem (e.g. overheating, data corruption).
  743. The action the kernel takes depends on the severity of the problem,
  744. ranging from warning messages to halting the machine.
  745. config X86_MCE_INTEL
  746. def_bool y
  747. prompt "Intel MCE features"
  748. depends on X86_MCE && X86_LOCAL_APIC
  749. ---help---
  750. Additional support for intel specific MCE features such as
  751. the thermal monitor.
  752. config X86_MCE_AMD
  753. def_bool y
  754. prompt "AMD MCE features"
  755. depends on X86_MCE && X86_LOCAL_APIC
  756. ---help---
  757. Additional support for AMD specific MCE features such as
  758. the DRAM Error Threshold.
  759. config X86_ANCIENT_MCE
  760. bool "Support for old Pentium 5 / WinChip machine checks"
  761. depends on X86_32 && X86_MCE
  762. ---help---
  763. Include support for machine check handling on old Pentium 5 or WinChip
  764. systems. These typically need to be enabled explicitely on the command
  765. line.
  766. config X86_MCE_THRESHOLD
  767. depends on X86_MCE_AMD || X86_MCE_INTEL
  768. def_bool y
  769. config X86_MCE_INJECT
  770. depends on X86_MCE
  771. tristate "Machine check injector support"
  772. ---help---
  773. Provide support for injecting machine checks for testing purposes.
  774. If you don't know what a machine check is and you don't do kernel
  775. QA it is safe to say n.
  776. config X86_THERMAL_VECTOR
  777. def_bool y
  778. depends on X86_MCE_INTEL
  779. config VM86
  780. bool "Enable VM86 support" if EXPERT
  781. default y
  782. depends on X86_32
  783. ---help---
  784. This option is required by programs like DOSEMU to run 16-bit legacy
  785. code on X86 processors. It also may be needed by software like
  786. XFree86 to initialize some video cards via BIOS. Disabling this
  787. option saves about 6k.
  788. config TOSHIBA
  789. tristate "Toshiba Laptop support"
  790. depends on X86_32
  791. ---help---
  792. This adds a driver to safely access the System Management Mode of
  793. the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
  794. not work on models with a Phoenix BIOS. The System Management Mode
  795. is used to set the BIOS and power saving options on Toshiba portables.
  796. For information on utilities to make use of this driver see the
  797. Toshiba Linux utilities web site at:
  798. <http://www.buzzard.org.uk/toshiba/>.
  799. Say Y if you intend to run this kernel on a Toshiba portable.
  800. Say N otherwise.
  801. config I8K
  802. tristate "Dell laptop support"
  803. select HWMON
  804. ---help---
  805. This adds a driver to safely access the System Management Mode
  806. of the CPU on the Dell Inspiron 8000. The System Management Mode
  807. is used to read cpu temperature and cooling fan status and to
  808. control the fans on the I8K portables.
  809. This driver has been tested only on the Inspiron 8000 but it may
  810. also work with other Dell laptops. You can force loading on other
  811. models by passing the parameter `force=1' to the module. Use at
  812. your own risk.
  813. For information on utilities to make use of this driver see the
  814. I8K Linux utilities web site at:
  815. <http://people.debian.org/~dz/i8k/>
  816. Say Y if you intend to run this kernel on a Dell Inspiron 8000.
  817. Say N otherwise.
  818. config X86_REBOOTFIXUPS
  819. bool "Enable X86 board specific fixups for reboot"
  820. depends on X86_32
  821. ---help---
  822. This enables chipset and/or board specific fixups to be done
  823. in order to get reboot to work correctly. This is only needed on
  824. some combinations of hardware and BIOS. The symptom, for which
  825. this config is intended, is when reboot ends with a stalled/hung
  826. system.
  827. Currently, the only fixup is for the Geode machines using
  828. CS5530A and CS5536 chipsets and the RDC R-321x SoC.
  829. Say Y if you want to enable the fixup. Currently, it's safe to
  830. enable this option even if you don't need it.
  831. Say N otherwise.
  832. config MICROCODE
  833. tristate "/dev/cpu/microcode - microcode support"
  834. select FW_LOADER
  835. ---help---
  836. If you say Y here, you will be able to update the microcode on
  837. certain Intel and AMD processors. The Intel support is for the
  838. IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
  839. Pentium 4, Xeon etc. The AMD support is for family 0x10 and
  840. 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
  841. You will obviously need the actual microcode binary data itself
  842. which is not shipped with the Linux kernel.
  843. This option selects the general module only, you need to select
  844. at least one vendor specific module as well.
  845. To compile this driver as a module, choose M here: the
  846. module will be called microcode.
  847. config MICROCODE_INTEL
  848. bool "Intel microcode patch loading support"
  849. depends on MICROCODE
  850. default MICROCODE
  851. select FW_LOADER
  852. ---help---
  853. This options enables microcode patch loading support for Intel
  854. processors.
  855. For latest news and information on obtaining all the required
  856. Intel ingredients for this driver, check:
  857. <http://www.urbanmyth.org/microcode/>.
  858. config MICROCODE_AMD
  859. bool "AMD microcode patch loading support"
  860. depends on MICROCODE
  861. select FW_LOADER
  862. ---help---
  863. If you select this option, microcode patch loading support for AMD
  864. processors will be enabled.
  865. config MICROCODE_OLD_INTERFACE
  866. def_bool y
  867. depends on MICROCODE
  868. config X86_MSR
  869. tristate "/dev/cpu/*/msr - Model-specific register support"
  870. ---help---
  871. This device gives privileged processes access to the x86
  872. Model-Specific Registers (MSRs). It is a character device with
  873. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  874. MSR accesses are directed to a specific CPU on multi-processor
  875. systems.
  876. config X86_CPUID
  877. tristate "/dev/cpu/*/cpuid - CPU information support"
  878. ---help---
  879. This device gives processes access to the x86 CPUID instruction to
  880. be executed on a specific processor. It is a character device
  881. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  882. /dev/cpu/31/cpuid.
  883. choice
  884. prompt "High Memory Support"
  885. default HIGHMEM64G if X86_NUMAQ
  886. default HIGHMEM4G
  887. depends on X86_32
  888. config NOHIGHMEM
  889. bool "off"
  890. depends on !X86_NUMAQ
  891. ---help---
  892. Linux can use up to 64 Gigabytes of physical memory on x86 systems.
  893. However, the address space of 32-bit x86 processors is only 4
  894. Gigabytes large. That means that, if you have a large amount of
  895. physical memory, not all of it can be "permanently mapped" by the
  896. kernel. The physical memory that's not permanently mapped is called
  897. "high memory".
  898. If you are compiling a kernel which will never run on a machine with
  899. more than 1 Gigabyte total physical RAM, answer "off" here (default
  900. choice and suitable for most users). This will result in a "3GB/1GB"
  901. split: 3GB are mapped so that each process sees a 3GB virtual memory
  902. space and the remaining part of the 4GB virtual memory space is used
  903. by the kernel to permanently map as much physical memory as
  904. possible.
  905. If the machine has between 1 and 4 Gigabytes physical RAM, then
  906. answer "4GB" here.
  907. If more than 4 Gigabytes is used then answer "64GB" here. This
  908. selection turns Intel PAE (Physical Address Extension) mode on.
  909. PAE implements 3-level paging on IA32 processors. PAE is fully
  910. supported by Linux, PAE mode is implemented on all recent Intel
  911. processors (Pentium Pro and better). NOTE: If you say "64GB" here,
  912. then the kernel will not boot on CPUs that don't support PAE!
  913. The actual amount of total physical memory will either be
  914. auto detected or can be forced by using a kernel command line option
  915. such as "mem=256M". (Try "man bootparam" or see the documentation of
  916. your boot loader (lilo or loadlin) about how to pass options to the
  917. kernel at boot time.)
  918. If unsure, say "off".
  919. config HIGHMEM4G
  920. bool "4GB"
  921. depends on !X86_NUMAQ
  922. ---help---
  923. Select this if you have a 32-bit processor and between 1 and 4
  924. gigabytes of physical RAM.
  925. config HIGHMEM64G
  926. bool "64GB"
  927. depends on !M386 && !M486
  928. select X86_PAE
  929. ---help---
  930. Select this if you have a 32-bit processor and more than 4
  931. gigabytes of physical RAM.
  932. endchoice
  933. choice
  934. depends on EXPERIMENTAL
  935. prompt "Memory split" if EXPERT
  936. default VMSPLIT_3G
  937. depends on X86_32
  938. ---help---
  939. Select the desired split between kernel and user memory.
  940. If the address range available to the kernel is less than the
  941. physical memory installed, the remaining memory will be available
  942. as "high memory". Accessing high memory is a little more costly
  943. than low memory, as it needs to be mapped into the kernel first.
  944. Note that increasing the kernel address space limits the range
  945. available to user programs, making the address space there
  946. tighter. Selecting anything other than the default 3G/1G split
  947. will also likely make your kernel incompatible with binary-only
  948. kernel modules.
  949. If you are not absolutely sure what you are doing, leave this
  950. option alone!
  951. config VMSPLIT_3G
  952. bool "3G/1G user/kernel split"
  953. config VMSPLIT_3G_OPT
  954. depends on !X86_PAE
  955. bool "3G/1G user/kernel split (for full 1G low memory)"
  956. config VMSPLIT_2G
  957. bool "2G/2G user/kernel split"
  958. config VMSPLIT_2G_OPT
  959. depends on !X86_PAE
  960. bool "2G/2G user/kernel split (for full 2G low memory)"
  961. config VMSPLIT_1G
  962. bool "1G/3G user/kernel split"
  963. endchoice
  964. config PAGE_OFFSET
  965. hex
  966. default 0xB0000000 if VMSPLIT_3G_OPT
  967. default 0x80000000 if VMSPLIT_2G
  968. default 0x78000000 if VMSPLIT_2G_OPT
  969. default 0x40000000 if VMSPLIT_1G
  970. default 0xC0000000
  971. depends on X86_32
  972. config HIGHMEM
  973. def_bool y
  974. depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
  975. config X86_PAE
  976. bool "PAE (Physical Address Extension) Support"
  977. depends on X86_32 && !HIGHMEM4G
  978. ---help---
  979. PAE is required for NX support, and furthermore enables
  980. larger swapspace support for non-overcommit purposes. It
  981. has the cost of more pagetable lookup overhead, and also
  982. consumes more pagetable space per process.
  983. config ARCH_PHYS_ADDR_T_64BIT
  984. def_bool X86_64 || X86_PAE
  985. config ARCH_DMA_ADDR_T_64BIT
  986. def_bool X86_64 || HIGHMEM64G
  987. config DIRECT_GBPAGES
  988. bool "Enable 1GB pages for kernel pagetables" if EXPERT
  989. default y
  990. depends on X86_64
  991. ---help---
  992. Allow the kernel linear mapping to use 1GB pages on CPUs that
  993. support it. This can improve the kernel's performance a tiny bit by
  994. reducing TLB pressure. If in doubt, say "Y".
  995. # Common NUMA Features
  996. config NUMA
  997. bool "Numa Memory Allocation and Scheduler Support"
  998. depends on SMP
  999. depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
  1000. default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
  1001. ---help---
  1002. Enable NUMA (Non Uniform Memory Access) support.
  1003. The kernel will try to allocate memory used by a CPU on the
  1004. local memory controller of the CPU and add some more
  1005. NUMA awareness to the kernel.
  1006. For 64-bit this is recommended if the system is Intel Core i7
  1007. (or later), AMD Opteron, or EM64T NUMA.
  1008. For 32-bit this is only needed on (rare) 32-bit-only platforms
  1009. that support NUMA topologies, such as NUMAQ / Summit, or if you
  1010. boot a 32-bit kernel on a 64-bit NUMA platform.
  1011. Otherwise, you should say N.
  1012. comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
  1013. depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
  1014. config AMD_NUMA
  1015. def_bool y
  1016. prompt "Old style AMD Opteron NUMA detection"
  1017. depends on X86_64 && NUMA && PCI
  1018. ---help---
  1019. Enable AMD NUMA node topology detection. You should say Y here if
  1020. you have a multi processor AMD system. This uses an old method to
  1021. read the NUMA configuration directly from the builtin Northbridge
  1022. of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
  1023. which also takes priority if both are compiled in.
  1024. config X86_64_ACPI_NUMA
  1025. def_bool y
  1026. prompt "ACPI NUMA detection"
  1027. depends on X86_64 && NUMA && ACPI && PCI
  1028. select ACPI_NUMA
  1029. ---help---
  1030. Enable ACPI SRAT based node topology detection.
  1031. # Some NUMA nodes have memory ranges that span
  1032. # other nodes. Even though a pfn is valid and
  1033. # between a node's start and end pfns, it may not
  1034. # reside on that node. See memmap_init_zone()
  1035. # for details.
  1036. config NODES_SPAN_OTHER_NODES
  1037. def_bool y
  1038. depends on X86_64_ACPI_NUMA
  1039. config NUMA_EMU
  1040. bool "NUMA emulation"
  1041. depends on NUMA
  1042. ---help---
  1043. Enable NUMA emulation. A flat machine will be split
  1044. into virtual nodes when booted with "numa=fake=N", where N is the
  1045. number of nodes. This is only useful for debugging.
  1046. config NODES_SHIFT
  1047. int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
  1048. range 1 10
  1049. default "10" if MAXSMP
  1050. default "6" if X86_64
  1051. default "4" if X86_NUMAQ
  1052. default "3"
  1053. depends on NEED_MULTIPLE_NODES
  1054. ---help---
  1055. Specify the maximum number of NUMA Nodes available on the target
  1056. system. Increases memory reserved to accommodate various tables.
  1057. config HAVE_ARCH_BOOTMEM
  1058. def_bool y
  1059. depends on X86_32 && NUMA
  1060. config HAVE_ARCH_ALLOC_REMAP
  1061. def_bool y
  1062. depends on X86_32 && NUMA
  1063. config ARCH_HAVE_MEMORY_PRESENT
  1064. def_bool y
  1065. depends on X86_32 && DISCONTIGMEM
  1066. config NEED_NODE_MEMMAP_SIZE
  1067. def_bool y
  1068. depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
  1069. config ARCH_FLATMEM_ENABLE
  1070. def_bool y
  1071. depends on X86_32 && !NUMA
  1072. config ARCH_DISCONTIGMEM_ENABLE
  1073. def_bool y
  1074. depends on NUMA && X86_32
  1075. config ARCH_DISCONTIGMEM_DEFAULT
  1076. def_bool y
  1077. depends on NUMA && X86_32
  1078. config ARCH_SPARSEMEM_ENABLE
  1079. def_bool y
  1080. depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
  1081. select SPARSEMEM_STATIC if X86_32
  1082. select SPARSEMEM_VMEMMAP_ENABLE if X86_64
  1083. config ARCH_SPARSEMEM_DEFAULT
  1084. def_bool y
  1085. depends on X86_64
  1086. config ARCH_SELECT_MEMORY_MODEL
  1087. def_bool y
  1088. depends on ARCH_SPARSEMEM_ENABLE
  1089. config ARCH_MEMORY_PROBE
  1090. def_bool X86_64
  1091. depends on MEMORY_HOTPLUG
  1092. config ARCH_PROC_KCORE_TEXT
  1093. def_bool y
  1094. depends on X86_64 && PROC_KCORE
  1095. config ILLEGAL_POINTER_VALUE
  1096. hex
  1097. default 0 if X86_32
  1098. default 0xdead000000000000 if X86_64
  1099. source "mm/Kconfig"
  1100. config HIGHPTE
  1101. bool "Allocate 3rd-level pagetables from highmem"
  1102. depends on HIGHMEM
  1103. ---help---
  1104. The VM uses one page table entry for each page of physical memory.
  1105. For systems with a lot of RAM, this can be wasteful of precious
  1106. low memory. Setting this option will put user-space page table
  1107. entries in high memory.
  1108. config X86_CHECK_BIOS_CORRUPTION
  1109. bool "Check for low memory corruption"
  1110. ---help---
  1111. Periodically check for memory corruption in low memory, which
  1112. is suspected to be caused by BIOS. Even when enabled in the
  1113. configuration, it is disabled at runtime. Enable it by
  1114. setting "memory_corruption_check=1" on the kernel command
  1115. line. By default it scans the low 64k of memory every 60
  1116. seconds; see the memory_corruption_check_size and
  1117. memory_corruption_check_period parameters in
  1118. Documentation/kernel-parameters.txt to adjust this.
  1119. When enabled with the default parameters, this option has
  1120. almost no overhead, as it reserves a relatively small amount
  1121. of memory and scans it infrequently. It both detects corruption
  1122. and prevents it from affecting the running system.
  1123. It is, however, intended as a diagnostic tool; if repeatable
  1124. BIOS-originated corruption always affects the same memory,
  1125. you can use memmap= to prevent the kernel from using that
  1126. memory.
  1127. config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
  1128. bool "Set the default setting of memory_corruption_check"
  1129. depends on X86_CHECK_BIOS_CORRUPTION
  1130. default y
  1131. ---help---
  1132. Set whether the default state of memory_corruption_check is
  1133. on or off.
  1134. config X86_RESERVE_LOW
  1135. int "Amount of low memory, in kilobytes, to reserve for the BIOS"
  1136. default 64
  1137. range 4 640
  1138. ---help---
  1139. Specify the amount of low memory to reserve for the BIOS.
  1140. The first page contains BIOS data structures that the kernel
  1141. must not use, so that page must always be reserved.
  1142. By default we reserve the first 64K of physical RAM, as a
  1143. number of BIOSes are known to corrupt that memory range
  1144. during events such as suspend/resume or monitor cable
  1145. insertion, so it must not be used by the kernel.
  1146. You can set this to 4 if you are absolutely sure that you
  1147. trust the BIOS to get all its memory reservations and usages
  1148. right. If you know your BIOS have problems beyond the
  1149. default 64K area, you can set this to 640 to avoid using the
  1150. entire low memory range.
  1151. If you have doubts about the BIOS (e.g. suspend/resume does
  1152. not work or there's kernel crashes after certain hardware
  1153. hotplug events) then you might want to enable
  1154. X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
  1155. typical corruption patterns.
  1156. Leave this to the default value of 64 if you are unsure.
  1157. config MATH_EMULATION
  1158. bool
  1159. prompt "Math emulation" if X86_32
  1160. ---help---
  1161. Linux can emulate a math coprocessor (used for floating point
  1162. operations) if you don't have one. 486DX and Pentium processors have
  1163. a math coprocessor built in, 486SX and 386 do not, unless you added
  1164. a 487DX or 387, respectively. (The messages during boot time can
  1165. give you some hints here ["man dmesg"].) Everyone needs either a
  1166. coprocessor or this emulation.
  1167. If you don't have a math coprocessor, you need to say Y here; if you
  1168. say Y here even though you have a coprocessor, the coprocessor will
  1169. be used nevertheless. (This behavior can be changed with the kernel
  1170. command line option "no387", which comes handy if your coprocessor
  1171. is broken. Try "man bootparam" or see the documentation of your boot
  1172. loader (lilo or loadlin) about how to pass options to the kernel at
  1173. boot time.) This means that it is a good idea to say Y here if you
  1174. intend to use this kernel on different machines.
  1175. More information about the internals of the Linux math coprocessor
  1176. emulation can be found in <file:arch/x86/math-emu/README>.
  1177. If you are not sure, say Y; apart from resulting in a 66 KB bigger
  1178. kernel, it won't hurt.
  1179. config MTRR
  1180. def_bool y
  1181. prompt "MTRR (Memory Type Range Register) support" if EXPERT
  1182. ---help---
  1183. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  1184. the Memory Type Range Registers (MTRRs) may be used to control
  1185. processor access to memory ranges. This is most useful if you have
  1186. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  1187. allows bus write transfers to be combined into a larger transfer
  1188. before bursting over the PCI/AGP bus. This can increase performance
  1189. of image write operations 2.5 times or more. Saying Y here creates a
  1190. /proc/mtrr file which may be used to manipulate your processor's
  1191. MTRRs. Typically the X server should use this.
  1192. This code has a reasonably generic interface so that similar
  1193. control registers on other processors can be easily supported
  1194. as well:
  1195. The Cyrix 6x86, 6x86MX and M II processors have Address Range
  1196. Registers (ARRs) which provide a similar functionality to MTRRs. For
  1197. these, the ARRs are used to emulate the MTRRs.
  1198. The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
  1199. MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
  1200. write-combining. All of these processors are supported by this code
  1201. and it makes sense to say Y here if you have one of them.
  1202. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  1203. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  1204. can lead to all sorts of problems, so it's good to say Y here.
  1205. You can safely say Y even if your machine doesn't have MTRRs, you'll
  1206. just add about 9 KB to your kernel.
  1207. See <file:Documentation/x86/mtrr.txt> for more information.
  1208. config MTRR_SANITIZER
  1209. def_bool y
  1210. prompt "MTRR cleanup support"
  1211. depends on MTRR
  1212. ---help---
  1213. Convert MTRR layout from continuous to discrete, so X drivers can
  1214. add writeback entries.
  1215. Can be disabled with disable_mtrr_cleanup on the kernel command line.
  1216. The largest mtrr entry size for a continuous block can be set with
  1217. mtrr_chunk_size.
  1218. If unsure, say Y.
  1219. config MTRR_SANITIZER_ENABLE_DEFAULT
  1220. int "MTRR cleanup enable value (0-1)"
  1221. range 0 1
  1222. default "0"
  1223. depends on MTRR_SANITIZER
  1224. ---help---
  1225. Enable mtrr cleanup default value
  1226. config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
  1227. int "MTRR cleanup spare reg num (0-7)"
  1228. range 0 7
  1229. default "1"
  1230. depends on MTRR_SANITIZER
  1231. ---help---
  1232. mtrr cleanup spare entries default, it can be changed via
  1233. mtrr_spare_reg_nr=N on the kernel command line.
  1234. config X86_PAT
  1235. def_bool y
  1236. prompt "x86 PAT support" if EXPERT
  1237. depends on MTRR
  1238. ---help---
  1239. Use PAT attributes to setup page level cache control.
  1240. PATs are the modern equivalents of MTRRs and are much more
  1241. flexible than MTRRs.
  1242. Say N here if you see bootup problems (boot crash, boot hang,
  1243. spontaneous reboots) or a non-working video driver.
  1244. If unsure, say Y.
  1245. config ARCH_USES_PG_UNCACHED
  1246. def_bool y
  1247. depends on X86_PAT
  1248. config ARCH_RANDOM
  1249. def_bool y
  1250. prompt "x86 architectural random number generator" if EXPERT
  1251. ---help---
  1252. Enable the x86 architectural RDRAND instruction
  1253. (Intel Bull Mountain technology) to generate random numbers.
  1254. If supported, this is a high bandwidth, cryptographically
  1255. secure hardware random number generator.
  1256. config EFI
  1257. bool "EFI runtime service support"
  1258. depends on ACPI
  1259. ---help---
  1260. This enables the kernel to use EFI runtime services that are
  1261. available (such as the EFI variable services).
  1262. This option is only useful on systems that have EFI firmware.
  1263. In addition, you should use the latest ELILO loader available
  1264. at <http://elilo.sourceforge.net> in order to take advantage
  1265. of EFI runtime services. However, even with this option, the
  1266. resultant kernel should continue to boot on existing non-EFI
  1267. platforms.
  1268. config EFI_STUB
  1269. bool "EFI stub support"
  1270. depends on EFI
  1271. ---help---
  1272. This kernel feature allows a bzImage to be loaded directly
  1273. by EFI firmware without the use of a bootloader.
  1274. config SECCOMP
  1275. def_bool y
  1276. prompt "Enable seccomp to safely compute untrusted bytecode"
  1277. ---help---
  1278. This kernel feature is useful for number crunching applications
  1279. that may need to compute untrusted bytecode during their
  1280. execution. By using pipes or other transports made available to
  1281. the process as file descriptors supporting the read/write
  1282. syscalls, it's possible to isolate those applications in
  1283. their own address space using seccomp. Once seccomp is
  1284. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1285. and the task is only allowed to execute a few safe syscalls
  1286. defined by each seccomp mode.
  1287. If unsure, say Y. Only embedded should say N here.
  1288. config CC_STACKPROTECTOR
  1289. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1290. ---help---
  1291. This option turns on the -fstack-protector GCC feature. This
  1292. feature puts, at the beginning of functions, a canary value on
  1293. the stack just before the return address, and validates
  1294. the value just before actually returning. Stack based buffer
  1295. overflows (that need to overwrite this return address) now also
  1296. overwrite the canary, which gets detected and the attack is then
  1297. neutralized via a kernel panic.
  1298. This feature requires gcc version 4.2 or above, or a distribution
  1299. gcc with the feature backported. Older versions are automatically
  1300. detected and for those versions, this configuration option is
  1301. ignored. (and a warning is printed during bootup)
  1302. source kernel/Kconfig.hz
  1303. config KEXEC
  1304. bool "kexec system call"
  1305. ---help---
  1306. kexec is a system call that implements the ability to shutdown your
  1307. current kernel, and to start another kernel. It is like a reboot
  1308. but it is independent of the system firmware. And like a reboot
  1309. you can start any kernel with it, not just Linux.
  1310. The name comes from the similarity to the exec system call.
  1311. It is an ongoing process to be certain the hardware in a machine
  1312. is properly shutdown, so do not be surprised if this code does not
  1313. initially work for you. It may help to enable device hotplugging
  1314. support. As of this writing the exact hardware interface is
  1315. strongly in flux, so no good recommendation can be made.
  1316. config CRASH_DUMP
  1317. bool "kernel crash dumps"
  1318. depends on X86_64 || (X86_32 && HIGHMEM)
  1319. ---help---
  1320. Generate crash dump after being started by kexec.
  1321. This should be normally only set in special crash dump kernels
  1322. which are loaded in the main kernel with kexec-tools into
  1323. a specially reserved region and then later executed after
  1324. a crash by kdump/kexec. The crash dump kernel must be compiled
  1325. to a memory address not used by the main kernel or BIOS using
  1326. PHYSICAL_START, or it must be built as a relocatable image
  1327. (CONFIG_RELOCATABLE=y).
  1328. For more details see Documentation/kdump/kdump.txt
  1329. config KEXEC_JUMP
  1330. bool "kexec jump (EXPERIMENTAL)"
  1331. depends on EXPERIMENTAL
  1332. depends on KEXEC && HIBERNATION
  1333. ---help---
  1334. Jump between original kernel and kexeced kernel and invoke
  1335. code in physical address mode via KEXEC
  1336. config PHYSICAL_START
  1337. hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
  1338. default "0x1000000"
  1339. ---help---
  1340. This gives the physical address where the kernel is loaded.
  1341. If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
  1342. bzImage will decompress itself to above physical address and
  1343. run from there. Otherwise, bzImage will run from the address where
  1344. it has been loaded by the boot loader and will ignore above physical
  1345. address.
  1346. In normal kdump cases one does not have to set/change this option
  1347. as now bzImage can be compiled as a completely relocatable image
  1348. (CONFIG_RELOCATABLE=y) and be used to load and run from a different
  1349. address. This option is mainly useful for the folks who don't want
  1350. to use a bzImage for capturing the crash dump and want to use a
  1351. vmlinux instead. vmlinux is not relocatable hence a kernel needs
  1352. to be specifically compiled to run from a specific memory area
  1353. (normally a reserved region) and this option comes handy.
  1354. So if you are using bzImage for capturing the crash dump,
  1355. leave the value here unchanged to 0x1000000 and set
  1356. CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
  1357. for capturing the crash dump change this value to start of
  1358. the reserved region. In other words, it can be set based on
  1359. the "X" value as specified in the "crashkernel=YM@XM"
  1360. command line boot parameter passed to the panic-ed
  1361. kernel. Please take a look at Documentation/kdump/kdump.txt
  1362. for more details about crash dumps.
  1363. Usage of bzImage for capturing the crash dump is recommended as
  1364. one does not have to build two kernels. Same kernel can be used
  1365. as production kernel and capture kernel. Above option should have
  1366. gone away after relocatable bzImage support is introduced. But it
  1367. is present because there are users out there who continue to use
  1368. vmlinux for dump capture. This option should go away down the
  1369. line.
  1370. Don't change this unless you know what you are doing.
  1371. config RELOCATABLE
  1372. bool "Build a relocatable kernel"
  1373. default y
  1374. ---help---
  1375. This builds a kernel image that retains relocation information
  1376. so it can be loaded someplace besides the default 1MB.
  1377. The relocations tend to make the kernel binary about 10% larger,
  1378. but are discarded at runtime.
  1379. One use is for the kexec on panic case where the recovery kernel
  1380. must live at a different physical address than the primary
  1381. kernel.
  1382. Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
  1383. it has been loaded at and the compile time physical address
  1384. (CONFIG_PHYSICAL_START) is ignored.
  1385. # Relocation on x86-32 needs some additional build support
  1386. config X86_NEED_RELOCS
  1387. def_bool y
  1388. depends on X86_32 && RELOCATABLE
  1389. config PHYSICAL_ALIGN
  1390. hex "Alignment value to which kernel should be aligned" if X86_32
  1391. default "0x1000000"
  1392. range 0x2000 0x1000000
  1393. ---help---
  1394. This value puts the alignment restrictions on physical address
  1395. where kernel is loaded and run from. Kernel is compiled for an
  1396. address which meets above alignment restriction.
  1397. If bootloader loads the kernel at a non-aligned address and
  1398. CONFIG_RELOCATABLE is set, kernel will move itself to nearest
  1399. address aligned to above value and run from there.
  1400. If bootloader loads the kernel at a non-aligned address and
  1401. CONFIG_RELOCATABLE is not set, kernel will ignore the run time
  1402. load address and decompress itself to the address it has been
  1403. compiled for and run from there. The address for which kernel is
  1404. compiled already meets above alignment restrictions. Hence the
  1405. end result is that kernel runs from a physical address meeting
  1406. above alignment restrictions.
  1407. Don't change this unless you know what you are doing.
  1408. config HOTPLUG_CPU
  1409. bool "Support for hot-pluggable CPUs"
  1410. depends on SMP && HOTPLUG
  1411. ---help---
  1412. Say Y here to allow turning CPUs off and on. CPUs can be
  1413. controlled through /sys/devices/system/cpu.
  1414. ( Note: power management support will enable this option
  1415. automatically on SMP systems. )
  1416. Say N if you want to disable CPU hotplug.
  1417. config COMPAT_VDSO
  1418. def_bool y
  1419. prompt "Compat VDSO support"
  1420. depends on X86_32 || IA32_EMULATION
  1421. ---help---
  1422. Map the 32-bit VDSO to the predictable old-style address too.
  1423. Say N here if you are running a sufficiently recent glibc
  1424. version (2.3.3 or later), to remove the high-mapped
  1425. VDSO mapping and to exclusively use the randomized VDSO.
  1426. If unsure, say Y.
  1427. config CMDLINE_BOOL
  1428. bool "Built-in kernel command line"
  1429. ---help---
  1430. Allow for specifying boot arguments to the kernel at
  1431. build time. On some systems (e.g. embedded ones), it is
  1432. necessary or convenient to provide some or all of the
  1433. kernel boot arguments with the kernel itself (that is,
  1434. to not rely on the boot loader to provide them.)
  1435. To compile command line arguments into the kernel,
  1436. set this option to 'Y', then fill in the
  1437. the boot arguments in CONFIG_CMDLINE.
  1438. Systems with fully functional boot loaders (i.e. non-embedded)
  1439. should leave this option set to 'N'.
  1440. config CMDLINE
  1441. string "Built-in kernel command string"
  1442. depends on CMDLINE_BOOL
  1443. default ""
  1444. ---help---
  1445. Enter arguments here that should be compiled into the kernel
  1446. image and used at boot time. If the boot loader provides a
  1447. command line at boot time, it is appended to this string to
  1448. form the full kernel command line, when the system boots.
  1449. However, you can use the CONFIG_CMDLINE_OVERRIDE option to
  1450. change this behavior.
  1451. In most cases, the command line (whether built-in or provided
  1452. by the boot loader) should specify the device for the root
  1453. file system.
  1454. config CMDLINE_OVERRIDE
  1455. bool "Built-in command line overrides boot loader arguments"
  1456. depends on CMDLINE_BOOL
  1457. ---help---
  1458. Set this option to 'Y' to have the kernel ignore the boot loader
  1459. command line, and use ONLY the built-in command line.
  1460. This is used to work around broken boot loaders. This should
  1461. be set to 'N' under normal conditions.
  1462. endmenu
  1463. config ARCH_ENABLE_MEMORY_HOTPLUG
  1464. def_bool y
  1465. depends on X86_64 || (X86_32 && HIGHMEM)
  1466. config ARCH_ENABLE_MEMORY_HOTREMOVE
  1467. def_bool y
  1468. depends on MEMORY_HOTPLUG
  1469. config USE_PERCPU_NUMA_NODE_ID
  1470. def_bool y
  1471. depends on NUMA
  1472. menu "Power management and ACPI options"
  1473. config ARCH_HIBERNATION_HEADER
  1474. def_bool y
  1475. depends on X86_64 && HIBERNATION
  1476. source "kernel/power/Kconfig"
  1477. source "drivers/acpi/Kconfig"
  1478. source "drivers/sfi/Kconfig"
  1479. config X86_APM_BOOT
  1480. def_bool y
  1481. depends on APM
  1482. menuconfig APM
  1483. tristate "APM (Advanced Power Management) BIOS support"
  1484. depends on X86_32 && PM_SLEEP
  1485. ---help---
  1486. APM is a BIOS specification for saving power using several different
  1487. techniques. This is mostly useful for battery powered laptops with
  1488. APM compliant BIOSes. If you say Y here, the system time will be
  1489. reset after a RESUME operation, the /proc/apm device will provide
  1490. battery status information, and user-space programs will receive
  1491. notification of APM "events" (e.g. battery status change).
  1492. If you select "Y" here, you can disable actual use of the APM
  1493. BIOS by passing the "apm=off" option to the kernel at boot time.
  1494. Note that the APM support is almost completely disabled for
  1495. machines with more than one CPU.
  1496. In order to use APM, you will need supporting software. For location
  1497. and more information, read <file:Documentation/power/apm-acpi.txt>
  1498. and the Battery Powered Linux mini-HOWTO, available from
  1499. <http://www.tldp.org/docs.html#howto>.
  1500. This driver does not spin down disk drives (see the hdparm(8)
  1501. manpage ("man 8 hdparm") for that), and it doesn't turn off
  1502. VESA-compliant "green" monitors.
  1503. This driver does not support the TI 4000M TravelMate and the ACER
  1504. 486/DX4/75 because they don't have compliant BIOSes. Many "green"
  1505. desktop machines also don't have compliant BIOSes, and this driver
  1506. may cause those machines to panic during the boot phase.
  1507. Generally, if you don't have a battery in your machine, there isn't
  1508. much point in using this driver and you should say N. If you get
  1509. random kernel OOPSes or reboots that don't seem to be related to
  1510. anything, try disabling/enabling this option (or disabling/enabling
  1511. APM in your BIOS).
  1512. Some other things you should try when experiencing seemingly random,
  1513. "weird" problems:
  1514. 1) make sure that you have enough swap space and that it is
  1515. enabled.
  1516. 2) pass the "no-hlt" option to the kernel
  1517. 3) switch on floating point emulation in the kernel and pass
  1518. the "no387" option to the kernel
  1519. 4) pass the "floppy=nodma" option to the kernel
  1520. 5) pass the "mem=4M" option to the kernel (thereby disabling
  1521. all but the first 4 MB of RAM)
  1522. 6) make sure that the CPU is not over clocked.
  1523. 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
  1524. 8) disable the cache from your BIOS settings
  1525. 9) install a fan for the video card or exchange video RAM
  1526. 10) install a better fan for the CPU
  1527. 11) exchange RAM chips
  1528. 12) exchange the motherboard.
  1529. To compile this driver as a module, choose M here: the
  1530. module will be called apm.
  1531. if APM
  1532. config APM_IGNORE_USER_SUSPEND
  1533. bool "Ignore USER SUSPEND"
  1534. ---help---
  1535. This option will ignore USER SUSPEND requests. On machines with a
  1536. compliant APM BIOS, you want to say N. However, on the NEC Versa M
  1537. series notebooks, it is necessary to say Y because of a BIOS bug.
  1538. config APM_DO_ENABLE
  1539. bool "Enable PM at boot time"
  1540. ---help---
  1541. Enable APM features at boot time. From page 36 of the APM BIOS
  1542. specification: "When disabled, the APM BIOS does not automatically
  1543. power manage devices, enter the Standby State, enter the Suspend
  1544. State, or take power saving steps in response to CPU Idle calls."
  1545. This driver will make CPU Idle calls when Linux is idle (unless this
  1546. feature is turned off -- see "Do CPU IDLE calls", below). This
  1547. should always save battery power, but more complicated APM features
  1548. will be dependent on your BIOS implementation. You may need to turn
  1549. this option off if your computer hangs at boot time when using APM
  1550. support, or if it beeps continuously instead of suspending. Turn
  1551. this off if you have a NEC UltraLite Versa 33/C or a Toshiba
  1552. T400CDT. This is off by default since most machines do fine without
  1553. this feature.
  1554. config APM_CPU_IDLE
  1555. bool "Make CPU Idle calls when idle"
  1556. ---help---
  1557. Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
  1558. On some machines, this can activate improved power savings, such as
  1559. a slowed CPU clock rate, when the machine is idle. These idle calls
  1560. are made after the idle loop has run for some length of time (e.g.,
  1561. 333 mS). On some machines, this will cause a hang at boot time or
  1562. whenever the CPU becomes idle. (On machines with more than one CPU,
  1563. this option does nothing.)
  1564. config APM_DISPLAY_BLANK
  1565. bool "Enable console blanking using APM"
  1566. ---help---
  1567. Enable console blanking using the APM. Some laptops can use this to
  1568. turn off the LCD backlight when the screen blanker of the Linux
  1569. virtual console blanks the screen. Note that this is only used by
  1570. the virtual console screen blanker, and won't turn off the backlight
  1571. when using the X Window system. This also doesn't have anything to
  1572. do with your VESA-compliant power-saving monitor. Further, this
  1573. option doesn't work for all laptops -- it might not turn off your
  1574. backlight at all, or it might print a lot of errors to the console,
  1575. especially if you are using gpm.
  1576. config APM_ALLOW_INTS
  1577. bool "Allow interrupts during APM BIOS calls"
  1578. ---help---
  1579. Normally we disable external interrupts while we are making calls to
  1580. the APM BIOS as a measure to lessen the effects of a badly behaving
  1581. BIOS implementation. The BIOS should reenable interrupts if it
  1582. needs to. Unfortunately, some BIOSes do not -- especially those in
  1583. many of the newer IBM Thinkpads. If you experience hangs when you
  1584. suspend, try setting this to Y. Otherwise, say N.
  1585. endif # APM
  1586. source "drivers/cpufreq/Kconfig"
  1587. source "drivers/cpuidle/Kconfig"
  1588. source "drivers/idle/Kconfig"
  1589. endmenu
  1590. menu "Bus options (PCI etc.)"
  1591. config PCI
  1592. bool "PCI support"
  1593. default y
  1594. select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
  1595. ---help---
  1596. Find out whether you have a PCI motherboard. PCI is the name of a
  1597. bus system, i.e. the way the CPU talks to the other stuff inside
  1598. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1599. VESA. If you have PCI, say Y, otherwise N.
  1600. choice
  1601. prompt "PCI access mode"
  1602. depends on X86_32 && PCI
  1603. default PCI_GOANY
  1604. ---help---
  1605. On PCI systems, the BIOS can be used to detect the PCI devices and
  1606. determine their configuration. However, some old PCI motherboards
  1607. have BIOS bugs and may crash if this is done. Also, some embedded
  1608. PCI-based systems don't have any BIOS at all. Linux can also try to
  1609. detect the PCI hardware directly without using the BIOS.
  1610. With this option, you can specify how Linux should detect the
  1611. PCI devices. If you choose "BIOS", the BIOS will be used,
  1612. if you choose "Direct", the BIOS won't be used, and if you
  1613. choose "MMConfig", then PCI Express MMCONFIG will be used.
  1614. If you choose "Any", the kernel will try MMCONFIG, then the
  1615. direct access method and falls back to the BIOS if that doesn't
  1616. work. If unsure, go with the default, which is "Any".
  1617. config PCI_GOBIOS
  1618. bool "BIOS"
  1619. config PCI_GOMMCONFIG
  1620. bool "MMConfig"
  1621. config PCI_GODIRECT
  1622. bool "Direct"
  1623. config PCI_GOOLPC
  1624. bool "OLPC XO-1"
  1625. depends on OLPC
  1626. config PCI_GOANY
  1627. bool "Any"
  1628. endchoice
  1629. config PCI_BIOS
  1630. def_bool y
  1631. depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
  1632. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  1633. config PCI_DIRECT
  1634. def_bool y
  1635. depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
  1636. config PCI_MMCONFIG
  1637. def_bool y
  1638. depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
  1639. config PCI_OLPC
  1640. def_bool y
  1641. depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
  1642. config PCI_XEN
  1643. def_bool y
  1644. depends on PCI && XEN
  1645. select SWIOTLB_XEN
  1646. config PCI_DOMAINS
  1647. def_bool y
  1648. depends on PCI
  1649. config PCI_MMCONFIG
  1650. bool "Support mmconfig PCI config space access"
  1651. depends on X86_64 && PCI && ACPI
  1652. config PCI_CNB20LE_QUIRK
  1653. bool "Read CNB20LE Host Bridge Windows" if EXPERT
  1654. default n
  1655. depends on PCI && EXPERIMENTAL
  1656. help
  1657. Read the PCI windows out of the CNB20LE host bridge. This allows
  1658. PCI hotplug to work on systems with the CNB20LE chipset which do
  1659. not have ACPI.
  1660. There's no public spec for this chipset, and this functionality
  1661. is known to be incomplete.
  1662. You should say N unless you know you need this.
  1663. source "drivers/pci/pcie/Kconfig"
  1664. source "drivers/pci/Kconfig"
  1665. # x86_64 have no ISA slots, but can have ISA-style DMA.
  1666. config ISA_DMA_API
  1667. bool "ISA-style DMA support" if (X86_64 && EXPERT)
  1668. default y
  1669. help
  1670. Enables ISA-style DMA support for devices requiring such controllers.
  1671. If unsure, say Y.
  1672. if X86_32
  1673. config ISA
  1674. bool "ISA support"
  1675. ---help---
  1676. Find out whether you have ISA slots on your motherboard. ISA is the
  1677. name of a bus system, i.e. the way the CPU talks to the other stuff
  1678. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1679. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1680. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1681. config EISA
  1682. bool "EISA support"
  1683. depends on ISA
  1684. ---help---
  1685. The Extended Industry Standard Architecture (EISA) bus was
  1686. developed as an open alternative to the IBM MicroChannel bus.
  1687. The EISA bus provided some of the features of the IBM MicroChannel
  1688. bus while maintaining backward compatibility with cards made for
  1689. the older ISA bus. The EISA bus saw limited use between 1988 and
  1690. 1995 when it was made obsolete by the PCI bus.
  1691. Say Y here if you are building a kernel for an EISA-based machine.
  1692. Otherwise, say N.
  1693. source "drivers/eisa/Kconfig"
  1694. config MCA
  1695. bool "MCA support"
  1696. ---help---
  1697. MicroChannel Architecture is found in some IBM PS/2 machines and
  1698. laptops. It is a bus system similar to PCI or ISA. See
  1699. <file:Documentation/mca.txt> (and especially the web page given
  1700. there) before attempting to build an MCA bus kernel.
  1701. source "drivers/mca/Kconfig"
  1702. config SCx200
  1703. tristate "NatSemi SCx200 support"
  1704. ---help---
  1705. This provides basic support for National Semiconductor's
  1706. (now AMD's) Geode processors. The driver probes for the
  1707. PCI-IDs of several on-chip devices, so its a good dependency
  1708. for other scx200_* drivers.
  1709. If compiled as a module, the driver is named scx200.
  1710. config SCx200HR_TIMER
  1711. tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
  1712. depends on SCx200
  1713. default y
  1714. ---help---
  1715. This driver provides a clocksource built upon the on-chip
  1716. 27MHz high-resolution timer. Its also a workaround for
  1717. NSC Geode SC-1100's buggy TSC, which loses time when the
  1718. processor goes idle (as is done by the scheduler). The
  1719. other workaround is idle=poll boot option.
  1720. config OLPC
  1721. bool "One Laptop Per Child support"
  1722. depends on !X86_PAE
  1723. select GPIOLIB
  1724. select OF
  1725. select OF_PROMTREE
  1726. ---help---
  1727. Add support for detecting the unique features of the OLPC
  1728. XO hardware.
  1729. config OLPC_XO1_PM
  1730. bool "OLPC XO-1 Power Management"
  1731. depends on OLPC && MFD_CS5535 && PM_SLEEP
  1732. select MFD_CORE
  1733. ---help---
  1734. Add support for poweroff and suspend of the OLPC XO-1 laptop.
  1735. config OLPC_XO1_RTC
  1736. bool "OLPC XO-1 Real Time Clock"
  1737. depends on OLPC_XO1_PM && RTC_DRV_CMOS
  1738. ---help---
  1739. Add support for the XO-1 real time clock, which can be used as a
  1740. programmable wakeup source.
  1741. config OLPC_XO1_SCI
  1742. bool "OLPC XO-1 SCI extras"
  1743. depends on OLPC && OLPC_XO1_PM
  1744. select POWER_SUPPLY
  1745. select GPIO_CS5535
  1746. select MFD_CORE
  1747. ---help---
  1748. Add support for SCI-based features of the OLPC XO-1 laptop:
  1749. - EC-driven system wakeups
  1750. - Power button
  1751. - Ebook switch
  1752. - Lid switch
  1753. - AC adapter status updates
  1754. - Battery status updates
  1755. config OLPC_XO15_SCI
  1756. bool "OLPC XO-1.5 SCI extras"
  1757. depends on OLPC && ACPI
  1758. select POWER_SUPPLY
  1759. ---help---
  1760. Add support for SCI-based features of the OLPC XO-1.5 laptop:
  1761. - EC-driven system wakeups
  1762. - AC adapter status updates
  1763. - Battery status updates
  1764. config ALIX
  1765. bool "PCEngines ALIX System Support (LED setup)"
  1766. select GPIOLIB
  1767. ---help---
  1768. This option enables system support for the PCEngines ALIX.
  1769. At present this just sets up LEDs for GPIO control on
  1770. ALIX2/3/6 boards. However, other system specific setup should
  1771. get added here.
  1772. Note: You must still enable the drivers for GPIO and LED support
  1773. (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
  1774. Note: You have to set alix.force=1 for boards with Award BIOS.
  1775. endif # X86_32
  1776. config AMD_NB
  1777. def_bool y
  1778. depends on CPU_SUP_AMD && PCI
  1779. source "drivers/pcmcia/Kconfig"
  1780. source "drivers/pci/hotplug/Kconfig"
  1781. config RAPIDIO
  1782. bool "RapidIO support"
  1783. depends on PCI
  1784. default n
  1785. help
  1786. If you say Y here, the kernel will include drivers and
  1787. infrastructure code to support RapidIO interconnect devices.
  1788. source "drivers/rapidio/Kconfig"
  1789. endmenu
  1790. menu "Executable file formats / Emulations"
  1791. source "fs/Kconfig.binfmt"
  1792. config IA32_EMULATION
  1793. bool "IA32 Emulation"
  1794. depends on X86_64
  1795. select COMPAT_BINFMT_ELF
  1796. ---help---
  1797. Include code to run 32-bit programs under a 64-bit kernel. You should
  1798. likely turn this on, unless you're 100% sure that you don't have any
  1799. 32-bit programs left.
  1800. config IA32_AOUT
  1801. tristate "IA32 a.out support"
  1802. depends on IA32_EMULATION
  1803. ---help---
  1804. Support old a.out binaries in the 32bit emulation.
  1805. config COMPAT
  1806. def_bool y
  1807. depends on IA32_EMULATION
  1808. config COMPAT_FOR_U64_ALIGNMENT
  1809. def_bool COMPAT
  1810. depends on X86_64
  1811. config SYSVIPC_COMPAT
  1812. def_bool y
  1813. depends on COMPAT && SYSVIPC
  1814. config KEYS_COMPAT
  1815. bool
  1816. depends on COMPAT && KEYS
  1817. default y
  1818. endmenu
  1819. config HAVE_ATOMIC_IOMAP
  1820. def_bool y
  1821. depends on X86_32
  1822. config HAVE_TEXT_POKE_SMP
  1823. bool
  1824. select STOP_MACHINE if SMP
  1825. source "net/Kconfig"
  1826. source "drivers/Kconfig"
  1827. source "drivers/firmware/Kconfig"
  1828. source "fs/Kconfig"
  1829. source "arch/x86/Kconfig.debug"
  1830. source "security/Kconfig"
  1831. source "crypto/Kconfig"
  1832. source "arch/x86/kvm/Kconfig"
  1833. source "lib/Kconfig"