Kconfig 68 KB

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  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. config X86_64
  11. def_bool 64BIT
  12. ### Arch settings
  13. config X86
  14. def_bool y
  15. select HAVE_AOUT if X86_32
  16. select HAVE_READQ
  17. select HAVE_WRITEQ
  18. select HAVE_UNSTABLE_SCHED_CLOCK
  19. select HAVE_IDE
  20. select HAVE_OPROFILE
  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 ARCH_WANT_OPTIONAL_GPIOLIB
  27. select ARCH_WANT_FRAME_POINTERS
  28. select HAVE_DMA_ATTRS
  29. select HAVE_KRETPROBES
  30. select HAVE_OPTPROBES
  31. select HAVE_FTRACE_MCOUNT_RECORD
  32. select HAVE_C_RECORDMCOUNT
  33. select HAVE_DYNAMIC_FTRACE
  34. select HAVE_FUNCTION_TRACER
  35. select HAVE_FUNCTION_GRAPH_TRACER
  36. select HAVE_FUNCTION_GRAPH_FP_TEST
  37. select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  38. select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE
  39. select HAVE_SYSCALL_TRACEPOINTS
  40. select HAVE_KVM
  41. select HAVE_ARCH_KGDB
  42. select HAVE_ARCH_TRACEHOOK
  43. select HAVE_GENERIC_DMA_COHERENT if X86_32
  44. select HAVE_EFFICIENT_UNALIGNED_ACCESS
  45. select USER_STACKTRACE_SUPPORT
  46. select HAVE_REGS_AND_STACK_ACCESS_API
  47. select HAVE_DMA_API_DEBUG
  48. select HAVE_KERNEL_GZIP
  49. select HAVE_KERNEL_BZIP2
  50. select HAVE_KERNEL_LZMA
  51. select HAVE_KERNEL_LZO
  52. select HAVE_HW_BREAKPOINT
  53. select HAVE_MIXED_BREAKPOINTS_REGS
  54. select PERF_EVENTS
  55. select HAVE_PERF_EVENTS_NMI
  56. select ANON_INODES
  57. select HAVE_ARCH_KMEMCHECK
  58. select HAVE_USER_RETURN_NOTIFIER
  59. select HAVE_ARCH_JUMP_LABEL
  60. select HAVE_TEXT_POKE_SMP
  61. select HAVE_GENERIC_HARDIRQS
  62. select HAVE_SPARSE_IRQ
  63. select GENERIC_IRQ_PROBE
  64. select GENERIC_PENDING_IRQ if SMP
  65. select USE_GENERIC_SMP_HELPERS if SMP
  66. config INSTRUCTION_DECODER
  67. def_bool (KPROBES || PERF_EVENTS)
  68. config OUTPUT_FORMAT
  69. string
  70. default "elf32-i386" if X86_32
  71. default "elf64-x86-64" if X86_64
  72. config ARCH_DEFCONFIG
  73. string
  74. default "arch/x86/configs/i386_defconfig" if X86_32
  75. default "arch/x86/configs/x86_64_defconfig" if X86_64
  76. config GENERIC_CMOS_UPDATE
  77. def_bool y
  78. config CLOCKSOURCE_WATCHDOG
  79. def_bool y
  80. config GENERIC_CLOCKEVENTS
  81. def_bool y
  82. config GENERIC_CLOCKEVENTS_BROADCAST
  83. def_bool y
  84. depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
  85. config LOCKDEP_SUPPORT
  86. def_bool y
  87. config STACKTRACE_SUPPORT
  88. def_bool y
  89. config HAVE_LATENCYTOP_SUPPORT
  90. def_bool y
  91. config MMU
  92. def_bool y
  93. config ZONE_DMA
  94. def_bool y
  95. config SBUS
  96. bool
  97. config NEED_DMA_MAP_STATE
  98. def_bool (X86_64 || DMAR || DMA_API_DEBUG)
  99. config NEED_SG_DMA_LENGTH
  100. def_bool y
  101. config GENERIC_ISA_DMA
  102. def_bool y
  103. config GENERIC_IOMAP
  104. def_bool y
  105. config GENERIC_BUG
  106. def_bool y
  107. depends on BUG
  108. select GENERIC_BUG_RELATIVE_POINTERS if X86_64
  109. config GENERIC_BUG_RELATIVE_POINTERS
  110. bool
  111. config GENERIC_HWEIGHT
  112. def_bool y
  113. config GENERIC_GPIO
  114. bool
  115. config ARCH_MAY_HAVE_PC_FDC
  116. def_bool y
  117. config RWSEM_GENERIC_SPINLOCK
  118. def_bool !X86_XADD
  119. config RWSEM_XCHGADD_ALGORITHM
  120. def_bool X86_XADD
  121. config ARCH_HAS_CPU_IDLE_WAIT
  122. def_bool y
  123. config GENERIC_CALIBRATE_DELAY
  124. def_bool y
  125. config GENERIC_TIME_VSYSCALL
  126. bool
  127. default X86_64
  128. config ARCH_HAS_CPU_RELAX
  129. def_bool y
  130. config ARCH_HAS_DEFAULT_IDLE
  131. def_bool y
  132. config ARCH_HAS_CACHE_LINE_SIZE
  133. def_bool y
  134. config HAVE_SETUP_PER_CPU_AREA
  135. def_bool y
  136. config NEED_PER_CPU_EMBED_FIRST_CHUNK
  137. def_bool y
  138. config NEED_PER_CPU_PAGE_FIRST_CHUNK
  139. def_bool y
  140. config HAVE_CPUMASK_OF_CPU_MAP
  141. def_bool X86_64_SMP
  142. config ARCH_HIBERNATION_POSSIBLE
  143. def_bool y
  144. config ARCH_SUSPEND_POSSIBLE
  145. def_bool y
  146. config ZONE_DMA32
  147. bool
  148. default X86_64
  149. config ARCH_POPULATES_NODE_MAP
  150. def_bool y
  151. config AUDIT_ARCH
  152. bool
  153. default X86_64
  154. config ARCH_SUPPORTS_OPTIMIZED_INLINING
  155. def_bool y
  156. config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  157. def_bool y
  158. config HAVE_INTEL_TXT
  159. def_bool y
  160. depends on EXPERIMENTAL && DMAR && ACPI
  161. config X86_32_SMP
  162. def_bool y
  163. depends on X86_32 && SMP
  164. config X86_64_SMP
  165. def_bool y
  166. depends on X86_64 && SMP
  167. config X86_HT
  168. def_bool y
  169. depends on SMP
  170. config X86_TRAMPOLINE
  171. def_bool y
  172. depends on SMP || (64BIT && ACPI_SLEEP)
  173. config X86_32_LAZY_GS
  174. def_bool y
  175. depends on X86_32 && !CC_STACKPROTECTOR
  176. config ARCH_HWEIGHT_CFLAGS
  177. string
  178. default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
  179. 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
  180. config KTIME_SCALAR
  181. def_bool X86_32
  182. config ARCH_CPU_PROBE_RELEASE
  183. def_bool y
  184. depends on HOTPLUG_CPU
  185. source "init/Kconfig"
  186. source "kernel/Kconfig.freezer"
  187. menu "Processor type and features"
  188. source "kernel/time/Kconfig"
  189. config SMP
  190. bool "Symmetric multi-processing support"
  191. ---help---
  192. This enables support for systems with more than one CPU. If you have
  193. a system with only one CPU, like most personal computers, say N. If
  194. you have a system with more than one CPU, say Y.
  195. If you say N here, the kernel will run on single and multiprocessor
  196. machines, but will use only one CPU of a multiprocessor machine. If
  197. you say Y here, the kernel will run on many, but not all,
  198. singleprocessor machines. On a singleprocessor machine, the kernel
  199. will run faster if you say N here.
  200. Note that if you say Y here and choose architecture "586" or
  201. "Pentium" under "Processor family", the kernel will not work on 486
  202. architectures. Similarly, multiprocessor kernels for the "PPro"
  203. architecture may not work on all Pentium based boards.
  204. People using multiprocessor machines who say Y here should also say
  205. Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
  206. Management" code will be disabled if you say Y here.
  207. See also <file:Documentation/i386/IO-APIC.txt>,
  208. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  209. <http://www.tldp.org/docs.html#howto>.
  210. If you don't know what to do here, say N.
  211. config X86_X2APIC
  212. bool "Support x2apic"
  213. depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
  214. ---help---
  215. This enables x2apic support on CPUs that have this feature.
  216. This allows 32-bit apic IDs (so it can support very large systems),
  217. and accesses the local apic via MSRs not via mmio.
  218. If you don't know what to do here, say N.
  219. config X86_MPPARSE
  220. bool "Enable MPS table" if ACPI
  221. default y
  222. depends on X86_LOCAL_APIC
  223. ---help---
  224. For old smp systems that do not have proper acpi support. Newer systems
  225. (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
  226. config X86_BIGSMP
  227. bool "Support for big SMP systems with more than 8 CPUs"
  228. depends on X86_32 && SMP
  229. ---help---
  230. This option is needed for the systems that have more than 8 CPUs
  231. if X86_32
  232. config X86_EXTENDED_PLATFORM
  233. bool "Support for extended (non-PC) x86 platforms"
  234. default y
  235. ---help---
  236. If you disable this option then the kernel will only support
  237. standard PC platforms. (which covers the vast majority of
  238. systems out there.)
  239. If you enable this option then you'll be able to select support
  240. for the following (non-PC) 32 bit x86 platforms:
  241. AMD Elan
  242. NUMAQ (IBM/Sequent)
  243. RDC R-321x SoC
  244. SGI 320/540 (Visual Workstation)
  245. Summit/EXA (IBM x440)
  246. Unisys ES7000 IA32 series
  247. Moorestown MID devices
  248. If you have one of these systems, or if you want to build a
  249. generic distribution kernel, say Y here - otherwise say N.
  250. endif
  251. if X86_64
  252. config X86_EXTENDED_PLATFORM
  253. bool "Support for extended (non-PC) x86 platforms"
  254. default y
  255. ---help---
  256. If you disable this option then the kernel will only support
  257. standard PC platforms. (which covers the vast majority of
  258. systems out there.)
  259. If you enable this option then you'll be able to select support
  260. for the following (non-PC) 64 bit x86 platforms:
  261. ScaleMP vSMP
  262. SGI Ultraviolet
  263. If you have one of these systems, or if you want to build a
  264. generic distribution kernel, say Y here - otherwise say N.
  265. endif
  266. # This is an alphabetically sorted list of 64 bit extended platforms
  267. # Please maintain the alphabetic order if and when there are additions
  268. config X86_VSMP
  269. bool "ScaleMP vSMP"
  270. select PARAVIRT_GUEST
  271. select PARAVIRT
  272. depends on X86_64 && PCI
  273. depends on X86_EXTENDED_PLATFORM
  274. ---help---
  275. Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
  276. supposed to run on these EM64T-based machines. Only choose this option
  277. if you have one of these machines.
  278. config X86_UV
  279. bool "SGI Ultraviolet"
  280. depends on X86_64
  281. depends on X86_EXTENDED_PLATFORM
  282. depends on NUMA
  283. depends on X86_X2APIC
  284. ---help---
  285. This option is needed in order to support SGI Ultraviolet systems.
  286. If you don't have one of these, you should say N here.
  287. # Following is an alphabetically sorted list of 32 bit extended platforms
  288. # Please maintain the alphabetic order if and when there are additions
  289. config X86_ELAN
  290. bool "AMD Elan"
  291. depends on X86_32
  292. depends on X86_EXTENDED_PLATFORM
  293. ---help---
  294. Select this for an AMD Elan processor.
  295. Do not use this option for K6/Athlon/Opteron processors!
  296. If unsure, choose "PC-compatible" instead.
  297. config X86_INTEL_CE
  298. bool "CE4100 TV platform"
  299. depends on PCI
  300. depends on PCI_GODIRECT
  301. depends on X86_32
  302. depends on X86_EXTENDED_PLATFORM
  303. select X86_REBOOTFIXUPS
  304. ---help---
  305. Select for the Intel CE media processor (CE4100) SOC.
  306. This option compiles in support for the CE4100 SOC for settop
  307. boxes and media devices.
  308. config X86_MRST
  309. bool "Moorestown MID platform"
  310. depends on PCI
  311. depends on PCI_GOANY
  312. depends on X86_32
  313. depends on X86_EXTENDED_PLATFORM
  314. depends on X86_IO_APIC
  315. select APB_TIMER
  316. select I2C
  317. select SPI
  318. select INTEL_SCU_IPC
  319. select X86_PLATFORM_DEVICES
  320. ---help---
  321. Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
  322. Internet Device(MID) platform. Moorestown consists of two chips:
  323. Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
  324. Unlike standard x86 PCs, Moorestown does not have many legacy devices
  325. nor standard legacy replacement devices/features. e.g. Moorestown does
  326. not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
  327. config X86_RDC321X
  328. bool "RDC R-321x SoC"
  329. depends on X86_32
  330. depends on X86_EXTENDED_PLATFORM
  331. select M486
  332. select X86_REBOOTFIXUPS
  333. ---help---
  334. This option is needed for RDC R-321x system-on-chip, also known
  335. as R-8610-(G).
  336. If you don't have one of these chips, you should say N here.
  337. config X86_32_NON_STANDARD
  338. bool "Support non-standard 32-bit SMP architectures"
  339. depends on X86_32 && SMP
  340. depends on X86_EXTENDED_PLATFORM
  341. ---help---
  342. This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
  343. subarchitectures. It is intended for a generic binary kernel.
  344. if you select them all, kernel will probe it one by one. and will
  345. fallback to default.
  346. # Alphabetically sorted list of Non standard 32 bit platforms
  347. config X86_NUMAQ
  348. bool "NUMAQ (IBM/Sequent)"
  349. depends on X86_32_NON_STANDARD
  350. depends on PCI
  351. select NUMA
  352. select X86_MPPARSE
  353. ---help---
  354. This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
  355. NUMA multiquad box. This changes the way that processors are
  356. bootstrapped, and uses Clustered Logical APIC addressing mode instead
  357. of Flat Logical. You will need a new lynxer.elf file to flash your
  358. firmware with - send email to <Martin.Bligh@us.ibm.com>.
  359. config X86_SUPPORTS_MEMORY_FAILURE
  360. def_bool y
  361. # MCE code calls memory_failure():
  362. depends on X86_MCE
  363. # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
  364. depends on !X86_NUMAQ
  365. # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
  366. depends on X86_64 || !SPARSEMEM
  367. select ARCH_SUPPORTS_MEMORY_FAILURE
  368. config X86_VISWS
  369. bool "SGI 320/540 (Visual Workstation)"
  370. depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
  371. depends on X86_32_NON_STANDARD
  372. ---help---
  373. The SGI Visual Workstation series is an IA32-based workstation
  374. based on SGI systems chips with some legacy PC hardware attached.
  375. Say Y here to create a kernel to run on the SGI 320 or 540.
  376. A kernel compiled for the Visual Workstation will run on general
  377. PCs as well. See <file:Documentation/sgi-visws.txt> for details.
  378. config X86_SUMMIT
  379. bool "Summit/EXA (IBM x440)"
  380. depends on X86_32_NON_STANDARD
  381. ---help---
  382. This option is needed for IBM systems that use the Summit/EXA chipset.
  383. In particular, it is needed for the x440.
  384. config X86_ES7000
  385. bool "Unisys ES7000 IA32 series"
  386. depends on X86_32_NON_STANDARD && X86_BIGSMP
  387. ---help---
  388. Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
  389. supposed to run on an IA32-based Unisys ES7000 system.
  390. config X86_32_IRIS
  391. tristate "Eurobraille/Iris poweroff module"
  392. depends on X86_32
  393. ---help---
  394. The Iris machines from EuroBraille do not have APM or ACPI support
  395. to shut themselves down properly. A special I/O sequence is
  396. needed to do so, which is what this module does at
  397. kernel shutdown.
  398. This is only for Iris machines from EuroBraille.
  399. If unused, say N.
  400. config SCHED_OMIT_FRAME_POINTER
  401. def_bool y
  402. prompt "Single-depth WCHAN output"
  403. depends on X86
  404. ---help---
  405. Calculate simpler /proc/<PID>/wchan values. If this option
  406. is disabled then wchan values will recurse back to the
  407. caller function. This provides more accurate wchan values,
  408. at the expense of slightly more scheduling overhead.
  409. If in doubt, say "Y".
  410. menuconfig PARAVIRT_GUEST
  411. bool "Paravirtualized guest support"
  412. ---help---
  413. Say Y here to get to see options related to running Linux under
  414. various hypervisors. This option alone does not add any kernel code.
  415. If you say N, all options in this submenu will be skipped and disabled.
  416. if PARAVIRT_GUEST
  417. source "arch/x86/xen/Kconfig"
  418. config KVM_CLOCK
  419. bool "KVM paravirtualized clock"
  420. select PARAVIRT
  421. select PARAVIRT_CLOCK
  422. ---help---
  423. Turning on this option will allow you to run a paravirtualized clock
  424. when running over the KVM hypervisor. Instead of relying on a PIT
  425. (or probably other) emulation by the underlying device model, the host
  426. provides the guest with timing infrastructure such as time of day, and
  427. system time
  428. config KVM_GUEST
  429. bool "KVM Guest support"
  430. select PARAVIRT
  431. ---help---
  432. This option enables various optimizations for running under the KVM
  433. hypervisor.
  434. source "arch/x86/lguest/Kconfig"
  435. config PARAVIRT
  436. bool "Enable paravirtualization code"
  437. ---help---
  438. This changes the kernel so it can modify itself when it is run
  439. under a hypervisor, potentially improving performance significantly
  440. over full virtualization. However, when run without a hypervisor
  441. the kernel is theoretically slower and slightly larger.
  442. config PARAVIRT_SPINLOCKS
  443. bool "Paravirtualization layer for spinlocks"
  444. depends on PARAVIRT && SMP && EXPERIMENTAL
  445. ---help---
  446. Paravirtualized spinlocks allow a pvops backend to replace the
  447. spinlock implementation with something virtualization-friendly
  448. (for example, block the virtual CPU rather than spinning).
  449. Unfortunately the downside is an up to 5% performance hit on
  450. native kernels, with various workloads.
  451. If you are unsure how to answer this question, answer N.
  452. config PARAVIRT_CLOCK
  453. bool
  454. endif
  455. config PARAVIRT_DEBUG
  456. bool "paravirt-ops debugging"
  457. depends on PARAVIRT && DEBUG_KERNEL
  458. ---help---
  459. Enable to debug paravirt_ops internals. Specifically, BUG if
  460. a paravirt_op is missing when it is called.
  461. config NO_BOOTMEM
  462. def_bool y
  463. config MEMTEST
  464. bool "Memtest"
  465. ---help---
  466. This option adds a kernel parameter 'memtest', which allows memtest
  467. to be set.
  468. memtest=0, mean disabled; -- default
  469. memtest=1, mean do 1 test pattern;
  470. ...
  471. memtest=4, mean do 4 test patterns.
  472. If you are unsure how to answer this question, answer N.
  473. config X86_SUMMIT_NUMA
  474. def_bool y
  475. depends on X86_32 && NUMA && X86_32_NON_STANDARD
  476. config X86_CYCLONE_TIMER
  477. def_bool y
  478. depends on X86_32_NON_STANDARD
  479. source "arch/x86/Kconfig.cpu"
  480. config HPET_TIMER
  481. def_bool X86_64
  482. prompt "HPET Timer Support" if X86_32
  483. ---help---
  484. Use the IA-PC HPET (High Precision Event Timer) to manage
  485. time in preference to the PIT and RTC, if a HPET is
  486. present.
  487. HPET is the next generation timer replacing legacy 8254s.
  488. The HPET provides a stable time base on SMP
  489. systems, unlike the TSC, but it is more expensive to access,
  490. as it is off-chip. You can find the HPET spec at
  491. <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
  492. You can safely choose Y here. However, HPET will only be
  493. activated if the platform and the BIOS support this feature.
  494. Otherwise the 8254 will be used for timing services.
  495. Choose N to continue using the legacy 8254 timer.
  496. config HPET_EMULATE_RTC
  497. def_bool y
  498. depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
  499. config APB_TIMER
  500. def_bool y if MRST
  501. prompt "Langwell APB Timer Support" if X86_MRST
  502. help
  503. APB timer is the replacement for 8254, HPET on X86 MID platforms.
  504. The APBT provides a stable time base on SMP
  505. systems, unlike the TSC, but it is more expensive to access,
  506. as it is off-chip. APB timers are always running regardless of CPU
  507. C states, they are used as per CPU clockevent device when possible.
  508. # Mark as embedded because too many people got it wrong.
  509. # The code disables itself when not needed.
  510. config DMI
  511. default y
  512. bool "Enable DMI scanning" if EMBEDDED
  513. ---help---
  514. Enabled scanning of DMI to identify machine quirks. Say Y
  515. here unless you have verified that your setup is not
  516. affected by entries in the DMI blacklist. Required by PNP
  517. BIOS code.
  518. config GART_IOMMU
  519. bool "GART IOMMU support" if EMBEDDED
  520. default y
  521. select SWIOTLB
  522. depends on X86_64 && PCI && AMD_NB
  523. ---help---
  524. Support for full DMA access of devices with 32bit memory access only
  525. on systems with more than 3GB. This is usually needed for USB,
  526. sound, many IDE/SATA chipsets and some other devices.
  527. Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
  528. based hardware IOMMU and a software bounce buffer based IOMMU used
  529. on Intel systems and as fallback.
  530. The code is only active when needed (enough memory and limited
  531. device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
  532. too.
  533. config CALGARY_IOMMU
  534. bool "IBM Calgary IOMMU support"
  535. select SWIOTLB
  536. depends on X86_64 && PCI && EXPERIMENTAL
  537. ---help---
  538. Support for hardware IOMMUs in IBM's xSeries x366 and x460
  539. systems. Needed to run systems with more than 3GB of memory
  540. properly with 32-bit PCI devices that do not support DAC
  541. (Double Address Cycle). Calgary also supports bus level
  542. isolation, where all DMAs pass through the IOMMU. This
  543. prevents them from going anywhere except their intended
  544. destination. This catches hard-to-find kernel bugs and
  545. mis-behaving drivers and devices that do not use the DMA-API
  546. properly to set up their DMA buffers. The IOMMU can be
  547. turned off at boot time with the iommu=off parameter.
  548. Normally the kernel will make the right choice by itself.
  549. If unsure, say Y.
  550. config CALGARY_IOMMU_ENABLED_BY_DEFAULT
  551. def_bool y
  552. prompt "Should Calgary be enabled by default?"
  553. depends on CALGARY_IOMMU
  554. ---help---
  555. Should Calgary be enabled by default? if you choose 'y', Calgary
  556. will be used (if it exists). If you choose 'n', Calgary will not be
  557. used even if it exists. If you choose 'n' and would like to use
  558. Calgary anyway, pass 'iommu=calgary' on the kernel command line.
  559. If unsure, say Y.
  560. config AMD_IOMMU
  561. bool "AMD IOMMU support"
  562. select SWIOTLB
  563. select PCI_MSI
  564. depends on X86_64 && PCI && ACPI
  565. ---help---
  566. With this option you can enable support for AMD IOMMU hardware in
  567. your system. An IOMMU is a hardware component which provides
  568. remapping of DMA memory accesses from devices. With an AMD IOMMU you
  569. can isolate the the DMA memory of different devices and protect the
  570. system from misbehaving device drivers or hardware.
  571. You can find out if your system has an AMD IOMMU if you look into
  572. your BIOS for an option to enable it or if you have an IVRS ACPI
  573. table.
  574. config AMD_IOMMU_STATS
  575. bool "Export AMD IOMMU statistics to debugfs"
  576. depends on AMD_IOMMU
  577. select DEBUG_FS
  578. ---help---
  579. This option enables code in the AMD IOMMU driver to collect various
  580. statistics about whats happening in the driver and exports that
  581. information to userspace via debugfs.
  582. If unsure, say N.
  583. # need this always selected by IOMMU for the VIA workaround
  584. config SWIOTLB
  585. def_bool y if X86_64
  586. ---help---
  587. Support for software bounce buffers used on x86-64 systems
  588. which don't have a hardware IOMMU (e.g. the current generation
  589. of Intel's x86-64 CPUs). Using this PCI devices which can only
  590. access 32-bits of memory can be used on systems with more than
  591. 3 GB of memory. If unsure, say Y.
  592. config IOMMU_HELPER
  593. def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
  594. config IOMMU_API
  595. def_bool (AMD_IOMMU || DMAR)
  596. config MAXSMP
  597. bool "Enable Maximum number of SMP Processors and NUMA Nodes"
  598. depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
  599. select CPUMASK_OFFSTACK
  600. ---help---
  601. Enable maximum number of CPUS and NUMA Nodes for this architecture.
  602. If unsure, say N.
  603. config NR_CPUS
  604. int "Maximum number of CPUs" if SMP && !MAXSMP
  605. range 2 8 if SMP && X86_32 && !X86_BIGSMP
  606. range 2 512 if SMP && !MAXSMP
  607. default "1" if !SMP
  608. default "4096" if MAXSMP
  609. default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
  610. default "8" if SMP
  611. ---help---
  612. This allows you to specify the maximum number of CPUs which this
  613. kernel will support. The maximum supported value is 512 and the
  614. minimum value which makes sense is 2.
  615. This is purely to save memory - each supported CPU adds
  616. approximately eight kilobytes to the kernel image.
  617. config SCHED_SMT
  618. bool "SMT (Hyperthreading) scheduler support"
  619. depends on X86_HT
  620. ---help---
  621. SMT scheduler support improves the CPU scheduler's decision making
  622. when dealing with Intel Pentium 4 chips with HyperThreading at a
  623. cost of slightly increased overhead in some places. If unsure say
  624. N here.
  625. config SCHED_MC
  626. def_bool y
  627. prompt "Multi-core scheduler support"
  628. depends on X86_HT
  629. ---help---
  630. Multi-core scheduler support improves the CPU scheduler's decision
  631. making when dealing with multi-core CPU chips at a cost of slightly
  632. increased overhead in some places. If unsure say N here.
  633. config IRQ_TIME_ACCOUNTING
  634. bool "Fine granularity task level IRQ time accounting"
  635. default n
  636. ---help---
  637. Select this option to enable fine granularity task irq time
  638. accounting. This is done by reading a timestamp on each
  639. transitions between softirq and hardirq state, so there can be a
  640. small performance impact.
  641. If in doubt, say N here.
  642. source "kernel/Kconfig.preempt"
  643. config X86_UP_APIC
  644. bool "Local APIC support on uniprocessors"
  645. depends on X86_32 && !SMP && !X86_32_NON_STANDARD
  646. ---help---
  647. A local APIC (Advanced Programmable Interrupt Controller) is an
  648. integrated interrupt controller in the CPU. If you have a single-CPU
  649. system which has a processor with a local APIC, you can say Y here to
  650. enable and use it. If you say Y here even though your machine doesn't
  651. have a local APIC, then the kernel will still run with no slowdown at
  652. all. The local APIC supports CPU-generated self-interrupts (timer,
  653. performance counters), and the NMI watchdog which detects hard
  654. lockups.
  655. config X86_UP_IOAPIC
  656. bool "IO-APIC support on uniprocessors"
  657. depends on X86_UP_APIC
  658. ---help---
  659. An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
  660. SMP-capable replacement for PC-style interrupt controllers. Most
  661. SMP systems and many recent uniprocessor systems have one.
  662. If you have a single-CPU system with an IO-APIC, you can say Y here
  663. to use it. If you say Y here even though your machine doesn't have
  664. an IO-APIC, then the kernel will still run with no slowdown at all.
  665. config X86_LOCAL_APIC
  666. def_bool y
  667. depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
  668. config X86_IO_APIC
  669. def_bool y
  670. depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
  671. config X86_VISWS_APIC
  672. def_bool y
  673. depends on X86_32 && X86_VISWS
  674. config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
  675. bool "Reroute for broken boot IRQs"
  676. depends on X86_IO_APIC
  677. ---help---
  678. This option enables a workaround that fixes a source of
  679. spurious interrupts. This is recommended when threaded
  680. interrupt handling is used on systems where the generation of
  681. superfluous "boot interrupts" cannot be disabled.
  682. Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
  683. entry in the chipset's IO-APIC is masked (as, e.g. the RT
  684. kernel does during interrupt handling). On chipsets where this
  685. boot IRQ generation cannot be disabled, this workaround keeps
  686. the original IRQ line masked so that only the equivalent "boot
  687. IRQ" is delivered to the CPUs. The workaround also tells the
  688. kernel to set up the IRQ handler on the boot IRQ line. In this
  689. way only one interrupt is delivered to the kernel. Otherwise
  690. the spurious second interrupt may cause the kernel to bring
  691. down (vital) interrupt lines.
  692. Only affects "broken" chipsets. Interrupt sharing may be
  693. increased on these systems.
  694. config X86_MCE
  695. bool "Machine Check / overheating reporting"
  696. ---help---
  697. Machine Check support allows the processor to notify the
  698. kernel if it detects a problem (e.g. overheating, data corruption).
  699. The action the kernel takes depends on the severity of the problem,
  700. ranging from warning messages to halting the machine.
  701. config X86_MCE_INTEL
  702. def_bool y
  703. prompt "Intel MCE features"
  704. depends on X86_MCE && X86_LOCAL_APIC
  705. ---help---
  706. Additional support for intel specific MCE features such as
  707. the thermal monitor.
  708. config X86_MCE_AMD
  709. def_bool y
  710. prompt "AMD MCE features"
  711. depends on X86_MCE && X86_LOCAL_APIC
  712. ---help---
  713. Additional support for AMD specific MCE features such as
  714. the DRAM Error Threshold.
  715. config X86_ANCIENT_MCE
  716. bool "Support for old Pentium 5 / WinChip machine checks"
  717. depends on X86_32 && X86_MCE
  718. ---help---
  719. Include support for machine check handling on old Pentium 5 or WinChip
  720. systems. These typically need to be enabled explicitely on the command
  721. line.
  722. config X86_MCE_THRESHOLD
  723. depends on X86_MCE_AMD || X86_MCE_INTEL
  724. def_bool y
  725. config X86_MCE_INJECT
  726. depends on X86_MCE
  727. tristate "Machine check injector support"
  728. ---help---
  729. Provide support for injecting machine checks for testing purposes.
  730. If you don't know what a machine check is and you don't do kernel
  731. QA it is safe to say n.
  732. config X86_THERMAL_VECTOR
  733. def_bool y
  734. depends on X86_MCE_INTEL
  735. config VM86
  736. bool "Enable VM86 support" if EMBEDDED
  737. default y
  738. depends on X86_32
  739. ---help---
  740. This option is required by programs like DOSEMU to run 16-bit legacy
  741. code on X86 processors. It also may be needed by software like
  742. XFree86 to initialize some video cards via BIOS. Disabling this
  743. option saves about 6k.
  744. config TOSHIBA
  745. tristate "Toshiba Laptop support"
  746. depends on X86_32
  747. ---help---
  748. This adds a driver to safely access the System Management Mode of
  749. the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
  750. not work on models with a Phoenix BIOS. The System Management Mode
  751. is used to set the BIOS and power saving options on Toshiba portables.
  752. For information on utilities to make use of this driver see the
  753. Toshiba Linux utilities web site at:
  754. <http://www.buzzard.org.uk/toshiba/>.
  755. Say Y if you intend to run this kernel on a Toshiba portable.
  756. Say N otherwise.
  757. config I8K
  758. tristate "Dell laptop support"
  759. ---help---
  760. This adds a driver to safely access the System Management Mode
  761. of the CPU on the Dell Inspiron 8000. The System Management Mode
  762. is used to read cpu temperature and cooling fan status and to
  763. control the fans on the I8K portables.
  764. This driver has been tested only on the Inspiron 8000 but it may
  765. also work with other Dell laptops. You can force loading on other
  766. models by passing the parameter `force=1' to the module. Use at
  767. your own risk.
  768. For information on utilities to make use of this driver see the
  769. I8K Linux utilities web site at:
  770. <http://people.debian.org/~dz/i8k/>
  771. Say Y if you intend to run this kernel on a Dell Inspiron 8000.
  772. Say N otherwise.
  773. config X86_REBOOTFIXUPS
  774. bool "Enable X86 board specific fixups for reboot"
  775. depends on X86_32
  776. ---help---
  777. This enables chipset and/or board specific fixups to be done
  778. in order to get reboot to work correctly. This is only needed on
  779. some combinations of hardware and BIOS. The symptom, for which
  780. this config is intended, is when reboot ends with a stalled/hung
  781. system.
  782. Currently, the only fixup is for the Geode machines using
  783. CS5530A and CS5536 chipsets and the RDC R-321x SoC.
  784. Say Y if you want to enable the fixup. Currently, it's safe to
  785. enable this option even if you don't need it.
  786. Say N otherwise.
  787. config MICROCODE
  788. tristate "/dev/cpu/microcode - microcode support"
  789. select FW_LOADER
  790. ---help---
  791. If you say Y here, you will be able to update the microcode on
  792. certain Intel and AMD processors. The Intel support is for the
  793. IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
  794. Pentium 4, Xeon etc. The AMD support is for family 0x10 and
  795. 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
  796. You will obviously need the actual microcode binary data itself
  797. which is not shipped with the Linux kernel.
  798. This option selects the general module only, you need to select
  799. at least one vendor specific module as well.
  800. To compile this driver as a module, choose M here: the
  801. module will be called microcode.
  802. config MICROCODE_INTEL
  803. bool "Intel microcode patch loading support"
  804. depends on MICROCODE
  805. default MICROCODE
  806. select FW_LOADER
  807. ---help---
  808. This options enables microcode patch loading support for Intel
  809. processors.
  810. For latest news and information on obtaining all the required
  811. Intel ingredients for this driver, check:
  812. <http://www.urbanmyth.org/microcode/>.
  813. config MICROCODE_AMD
  814. bool "AMD microcode patch loading support"
  815. depends on MICROCODE
  816. select FW_LOADER
  817. ---help---
  818. If you select this option, microcode patch loading support for AMD
  819. processors will be enabled.
  820. config MICROCODE_OLD_INTERFACE
  821. def_bool y
  822. depends on MICROCODE
  823. config X86_MSR
  824. tristate "/dev/cpu/*/msr - Model-specific register support"
  825. ---help---
  826. This device gives privileged processes access to the x86
  827. Model-Specific Registers (MSRs). It is a character device with
  828. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  829. MSR accesses are directed to a specific CPU on multi-processor
  830. systems.
  831. config X86_CPUID
  832. tristate "/dev/cpu/*/cpuid - CPU information support"
  833. ---help---
  834. This device gives processes access to the x86 CPUID instruction to
  835. be executed on a specific processor. It is a character device
  836. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  837. /dev/cpu/31/cpuid.
  838. choice
  839. prompt "High Memory Support"
  840. default HIGHMEM64G if X86_NUMAQ
  841. default HIGHMEM4G
  842. depends on X86_32
  843. config NOHIGHMEM
  844. bool "off"
  845. depends on !X86_NUMAQ
  846. ---help---
  847. Linux can use up to 64 Gigabytes of physical memory on x86 systems.
  848. However, the address space of 32-bit x86 processors is only 4
  849. Gigabytes large. That means that, if you have a large amount of
  850. physical memory, not all of it can be "permanently mapped" by the
  851. kernel. The physical memory that's not permanently mapped is called
  852. "high memory".
  853. If you are compiling a kernel which will never run on a machine with
  854. more than 1 Gigabyte total physical RAM, answer "off" here (default
  855. choice and suitable for most users). This will result in a "3GB/1GB"
  856. split: 3GB are mapped so that each process sees a 3GB virtual memory
  857. space and the remaining part of the 4GB virtual memory space is used
  858. by the kernel to permanently map as much physical memory as
  859. possible.
  860. If the machine has between 1 and 4 Gigabytes physical RAM, then
  861. answer "4GB" here.
  862. If more than 4 Gigabytes is used then answer "64GB" here. This
  863. selection turns Intel PAE (Physical Address Extension) mode on.
  864. PAE implements 3-level paging on IA32 processors. PAE is fully
  865. supported by Linux, PAE mode is implemented on all recent Intel
  866. processors (Pentium Pro and better). NOTE: If you say "64GB" here,
  867. then the kernel will not boot on CPUs that don't support PAE!
  868. The actual amount of total physical memory will either be
  869. auto detected or can be forced by using a kernel command line option
  870. such as "mem=256M". (Try "man bootparam" or see the documentation of
  871. your boot loader (lilo or loadlin) about how to pass options to the
  872. kernel at boot time.)
  873. If unsure, say "off".
  874. config HIGHMEM4G
  875. bool "4GB"
  876. depends on !X86_NUMAQ
  877. ---help---
  878. Select this if you have a 32-bit processor and between 1 and 4
  879. gigabytes of physical RAM.
  880. config HIGHMEM64G
  881. bool "64GB"
  882. depends on !M386 && !M486
  883. select X86_PAE
  884. ---help---
  885. Select this if you have a 32-bit processor and more than 4
  886. gigabytes of physical RAM.
  887. endchoice
  888. choice
  889. depends on EXPERIMENTAL
  890. prompt "Memory split" if EMBEDDED
  891. default VMSPLIT_3G
  892. depends on X86_32
  893. ---help---
  894. Select the desired split between kernel and user memory.
  895. If the address range available to the kernel is less than the
  896. physical memory installed, the remaining memory will be available
  897. as "high memory". Accessing high memory is a little more costly
  898. than low memory, as it needs to be mapped into the kernel first.
  899. Note that increasing the kernel address space limits the range
  900. available to user programs, making the address space there
  901. tighter. Selecting anything other than the default 3G/1G split
  902. will also likely make your kernel incompatible with binary-only
  903. kernel modules.
  904. If you are not absolutely sure what you are doing, leave this
  905. option alone!
  906. config VMSPLIT_3G
  907. bool "3G/1G user/kernel split"
  908. config VMSPLIT_3G_OPT
  909. depends on !X86_PAE
  910. bool "3G/1G user/kernel split (for full 1G low memory)"
  911. config VMSPLIT_2G
  912. bool "2G/2G user/kernel split"
  913. config VMSPLIT_2G_OPT
  914. depends on !X86_PAE
  915. bool "2G/2G user/kernel split (for full 2G low memory)"
  916. config VMSPLIT_1G
  917. bool "1G/3G user/kernel split"
  918. endchoice
  919. config PAGE_OFFSET
  920. hex
  921. default 0xB0000000 if VMSPLIT_3G_OPT
  922. default 0x80000000 if VMSPLIT_2G
  923. default 0x78000000 if VMSPLIT_2G_OPT
  924. default 0x40000000 if VMSPLIT_1G
  925. default 0xC0000000
  926. depends on X86_32
  927. config HIGHMEM
  928. def_bool y
  929. depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
  930. config X86_PAE
  931. bool "PAE (Physical Address Extension) Support"
  932. depends on X86_32 && !HIGHMEM4G
  933. ---help---
  934. PAE is required for NX support, and furthermore enables
  935. larger swapspace support for non-overcommit purposes. It
  936. has the cost of more pagetable lookup overhead, and also
  937. consumes more pagetable space per process.
  938. config ARCH_PHYS_ADDR_T_64BIT
  939. def_bool X86_64 || X86_PAE
  940. config ARCH_DMA_ADDR_T_64BIT
  941. def_bool X86_64 || HIGHMEM64G
  942. config DIRECT_GBPAGES
  943. bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
  944. default y
  945. depends on X86_64
  946. ---help---
  947. Allow the kernel linear mapping to use 1GB pages on CPUs that
  948. support it. This can improve the kernel's performance a tiny bit by
  949. reducing TLB pressure. If in doubt, say "Y".
  950. # Common NUMA Features
  951. config NUMA
  952. bool "Numa Memory Allocation and Scheduler Support"
  953. depends on SMP
  954. depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
  955. default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
  956. ---help---
  957. Enable NUMA (Non Uniform Memory Access) support.
  958. The kernel will try to allocate memory used by a CPU on the
  959. local memory controller of the CPU and add some more
  960. NUMA awareness to the kernel.
  961. For 64-bit this is recommended if the system is Intel Core i7
  962. (or later), AMD Opteron, or EM64T NUMA.
  963. For 32-bit this is only needed on (rare) 32-bit-only platforms
  964. that support NUMA topologies, such as NUMAQ / Summit, or if you
  965. boot a 32-bit kernel on a 64-bit NUMA platform.
  966. Otherwise, you should say N.
  967. comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
  968. depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
  969. config AMD_NUMA
  970. def_bool y
  971. prompt "Old style AMD Opteron NUMA detection"
  972. depends on X86_64 && NUMA && PCI
  973. ---help---
  974. Enable AMD NUMA node topology detection. You should say Y here if
  975. you have a multi processor AMD system. This uses an old method to
  976. read the NUMA configuration directly from the builtin Northbridge
  977. of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
  978. which also takes priority if both are compiled in.
  979. config X86_64_ACPI_NUMA
  980. def_bool y
  981. prompt "ACPI NUMA detection"
  982. depends on X86_64 && NUMA && ACPI && PCI
  983. select ACPI_NUMA
  984. ---help---
  985. Enable ACPI SRAT based node topology detection.
  986. # Some NUMA nodes have memory ranges that span
  987. # other nodes. Even though a pfn is valid and
  988. # between a node's start and end pfns, it may not
  989. # reside on that node. See memmap_init_zone()
  990. # for details.
  991. config NODES_SPAN_OTHER_NODES
  992. def_bool y
  993. depends on X86_64_ACPI_NUMA
  994. config NUMA_EMU
  995. bool "NUMA emulation"
  996. depends on X86_64 && NUMA
  997. ---help---
  998. Enable NUMA emulation. A flat machine will be split
  999. into virtual nodes when booted with "numa=fake=N", where N is the
  1000. number of nodes. This is only useful for debugging.
  1001. config NODES_SHIFT
  1002. int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
  1003. range 1 10
  1004. default "10" if MAXSMP
  1005. default "6" if X86_64
  1006. default "4" if X86_NUMAQ
  1007. default "3"
  1008. depends on NEED_MULTIPLE_NODES
  1009. ---help---
  1010. Specify the maximum number of NUMA Nodes available on the target
  1011. system. Increases memory reserved to accommodate various tables.
  1012. config HAVE_ARCH_BOOTMEM
  1013. def_bool y
  1014. depends on X86_32 && NUMA
  1015. config ARCH_HAVE_MEMORY_PRESENT
  1016. def_bool y
  1017. depends on X86_32 && DISCONTIGMEM
  1018. config NEED_NODE_MEMMAP_SIZE
  1019. def_bool y
  1020. depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
  1021. config HAVE_ARCH_ALLOC_REMAP
  1022. def_bool y
  1023. depends on X86_32 && NUMA
  1024. config ARCH_FLATMEM_ENABLE
  1025. def_bool y
  1026. depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
  1027. config ARCH_DISCONTIGMEM_ENABLE
  1028. def_bool y
  1029. depends on NUMA && X86_32
  1030. config ARCH_DISCONTIGMEM_DEFAULT
  1031. def_bool y
  1032. depends on NUMA && X86_32
  1033. config ARCH_PROC_KCORE_TEXT
  1034. def_bool y
  1035. depends on X86_64 && PROC_KCORE
  1036. config ARCH_SPARSEMEM_DEFAULT
  1037. def_bool y
  1038. depends on X86_64
  1039. config ARCH_SPARSEMEM_ENABLE
  1040. def_bool y
  1041. depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
  1042. select SPARSEMEM_STATIC if X86_32
  1043. select SPARSEMEM_VMEMMAP_ENABLE if X86_64
  1044. config ARCH_SELECT_MEMORY_MODEL
  1045. def_bool y
  1046. depends on ARCH_SPARSEMEM_ENABLE
  1047. config ARCH_MEMORY_PROBE
  1048. def_bool X86_64
  1049. depends on MEMORY_HOTPLUG
  1050. config ILLEGAL_POINTER_VALUE
  1051. hex
  1052. default 0 if X86_32
  1053. default 0xdead000000000000 if X86_64
  1054. source "mm/Kconfig"
  1055. config HIGHPTE
  1056. bool "Allocate 3rd-level pagetables from highmem"
  1057. depends on HIGHMEM
  1058. ---help---
  1059. The VM uses one page table entry for each page of physical memory.
  1060. For systems with a lot of RAM, this can be wasteful of precious
  1061. low memory. Setting this option will put user-space page table
  1062. entries in high memory.
  1063. config X86_CHECK_BIOS_CORRUPTION
  1064. bool "Check for low memory corruption"
  1065. ---help---
  1066. Periodically check for memory corruption in low memory, which
  1067. is suspected to be caused by BIOS. Even when enabled in the
  1068. configuration, it is disabled at runtime. Enable it by
  1069. setting "memory_corruption_check=1" on the kernel command
  1070. line. By default it scans the low 64k of memory every 60
  1071. seconds; see the memory_corruption_check_size and
  1072. memory_corruption_check_period parameters in
  1073. Documentation/kernel-parameters.txt to adjust this.
  1074. When enabled with the default parameters, this option has
  1075. almost no overhead, as it reserves a relatively small amount
  1076. of memory and scans it infrequently. It both detects corruption
  1077. and prevents it from affecting the running system.
  1078. It is, however, intended as a diagnostic tool; if repeatable
  1079. BIOS-originated corruption always affects the same memory,
  1080. you can use memmap= to prevent the kernel from using that
  1081. memory.
  1082. config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
  1083. bool "Set the default setting of memory_corruption_check"
  1084. depends on X86_CHECK_BIOS_CORRUPTION
  1085. default y
  1086. ---help---
  1087. Set whether the default state of memory_corruption_check is
  1088. on or off.
  1089. config X86_RESERVE_LOW
  1090. int "Amount of low memory, in kilobytes, to reserve for the BIOS"
  1091. default 64
  1092. range 4 640
  1093. ---help---
  1094. Specify the amount of low memory to reserve for the BIOS.
  1095. The first page contains BIOS data structures that the kernel
  1096. must not use, so that page must always be reserved.
  1097. By default we reserve the first 64K of physical RAM, as a
  1098. number of BIOSes are known to corrupt that memory range
  1099. during events such as suspend/resume or monitor cable
  1100. insertion, so it must not be used by the kernel.
  1101. You can set this to 4 if you are absolutely sure that you
  1102. trust the BIOS to get all its memory reservations and usages
  1103. right. If you know your BIOS have problems beyond the
  1104. default 64K area, you can set this to 640 to avoid using the
  1105. entire low memory range.
  1106. If you have doubts about the BIOS (e.g. suspend/resume does
  1107. not work or there's kernel crashes after certain hardware
  1108. hotplug events) then you might want to enable
  1109. X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
  1110. typical corruption patterns.
  1111. Leave this to the default value of 64 if you are unsure.
  1112. config MATH_EMULATION
  1113. bool
  1114. prompt "Math emulation" if X86_32
  1115. ---help---
  1116. Linux can emulate a math coprocessor (used for floating point
  1117. operations) if you don't have one. 486DX and Pentium processors have
  1118. a math coprocessor built in, 486SX and 386 do not, unless you added
  1119. a 487DX or 387, respectively. (The messages during boot time can
  1120. give you some hints here ["man dmesg"].) Everyone needs either a
  1121. coprocessor or this emulation.
  1122. If you don't have a math coprocessor, you need to say Y here; if you
  1123. say Y here even though you have a coprocessor, the coprocessor will
  1124. be used nevertheless. (This behavior can be changed with the kernel
  1125. command line option "no387", which comes handy if your coprocessor
  1126. is broken. Try "man bootparam" or see the documentation of your boot
  1127. loader (lilo or loadlin) about how to pass options to the kernel at
  1128. boot time.) This means that it is a good idea to say Y here if you
  1129. intend to use this kernel on different machines.
  1130. More information about the internals of the Linux math coprocessor
  1131. emulation can be found in <file:arch/x86/math-emu/README>.
  1132. If you are not sure, say Y; apart from resulting in a 66 KB bigger
  1133. kernel, it won't hurt.
  1134. config MTRR
  1135. def_bool y
  1136. prompt "MTRR (Memory Type Range Register) support" if EMBEDDED
  1137. ---help---
  1138. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  1139. the Memory Type Range Registers (MTRRs) may be used to control
  1140. processor access to memory ranges. This is most useful if you have
  1141. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  1142. allows bus write transfers to be combined into a larger transfer
  1143. before bursting over the PCI/AGP bus. This can increase performance
  1144. of image write operations 2.5 times or more. Saying Y here creates a
  1145. /proc/mtrr file which may be used to manipulate your processor's
  1146. MTRRs. Typically the X server should use this.
  1147. This code has a reasonably generic interface so that similar
  1148. control registers on other processors can be easily supported
  1149. as well:
  1150. The Cyrix 6x86, 6x86MX and M II processors have Address Range
  1151. Registers (ARRs) which provide a similar functionality to MTRRs. For
  1152. these, the ARRs are used to emulate the MTRRs.
  1153. The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
  1154. MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
  1155. write-combining. All of these processors are supported by this code
  1156. and it makes sense to say Y here if you have one of them.
  1157. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  1158. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  1159. can lead to all sorts of problems, so it's good to say Y here.
  1160. You can safely say Y even if your machine doesn't have MTRRs, you'll
  1161. just add about 9 KB to your kernel.
  1162. See <file:Documentation/x86/mtrr.txt> for more information.
  1163. config MTRR_SANITIZER
  1164. def_bool y
  1165. prompt "MTRR cleanup support"
  1166. depends on MTRR
  1167. ---help---
  1168. Convert MTRR layout from continuous to discrete, so X drivers can
  1169. add writeback entries.
  1170. Can be disabled with disable_mtrr_cleanup on the kernel command line.
  1171. The largest mtrr entry size for a continuous block can be set with
  1172. mtrr_chunk_size.
  1173. If unsure, say Y.
  1174. config MTRR_SANITIZER_ENABLE_DEFAULT
  1175. int "MTRR cleanup enable value (0-1)"
  1176. range 0 1
  1177. default "0"
  1178. depends on MTRR_SANITIZER
  1179. ---help---
  1180. Enable mtrr cleanup default value
  1181. config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
  1182. int "MTRR cleanup spare reg num (0-7)"
  1183. range 0 7
  1184. default "1"
  1185. depends on MTRR_SANITIZER
  1186. ---help---
  1187. mtrr cleanup spare entries default, it can be changed via
  1188. mtrr_spare_reg_nr=N on the kernel command line.
  1189. config X86_PAT
  1190. def_bool y
  1191. prompt "x86 PAT support" if EMBEDDED
  1192. depends on MTRR
  1193. ---help---
  1194. Use PAT attributes to setup page level cache control.
  1195. PATs are the modern equivalents of MTRRs and are much more
  1196. flexible than MTRRs.
  1197. Say N here if you see bootup problems (boot crash, boot hang,
  1198. spontaneous reboots) or a non-working video driver.
  1199. If unsure, say Y.
  1200. config ARCH_USES_PG_UNCACHED
  1201. def_bool y
  1202. depends on X86_PAT
  1203. config EFI
  1204. bool "EFI runtime service support"
  1205. depends on ACPI
  1206. ---help---
  1207. This enables the kernel to use EFI runtime services that are
  1208. available (such as the EFI variable services).
  1209. This option is only useful on systems that have EFI firmware.
  1210. In addition, you should use the latest ELILO loader available
  1211. at <http://elilo.sourceforge.net> in order to take advantage
  1212. of EFI runtime services. However, even with this option, the
  1213. resultant kernel should continue to boot on existing non-EFI
  1214. platforms.
  1215. config SECCOMP
  1216. def_bool y
  1217. prompt "Enable seccomp to safely compute untrusted bytecode"
  1218. ---help---
  1219. This kernel feature is useful for number crunching applications
  1220. that may need to compute untrusted bytecode during their
  1221. execution. By using pipes or other transports made available to
  1222. the process as file descriptors supporting the read/write
  1223. syscalls, it's possible to isolate those applications in
  1224. their own address space using seccomp. Once seccomp is
  1225. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1226. and the task is only allowed to execute a few safe syscalls
  1227. defined by each seccomp mode.
  1228. If unsure, say Y. Only embedded should say N here.
  1229. config CC_STACKPROTECTOR
  1230. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1231. ---help---
  1232. This option turns on the -fstack-protector GCC feature. This
  1233. feature puts, at the beginning of functions, a canary value on
  1234. the stack just before the return address, and validates
  1235. the value just before actually returning. Stack based buffer
  1236. overflows (that need to overwrite this return address) now also
  1237. overwrite the canary, which gets detected and the attack is then
  1238. neutralized via a kernel panic.
  1239. This feature requires gcc version 4.2 or above, or a distribution
  1240. gcc with the feature backported. Older versions are automatically
  1241. detected and for those versions, this configuration option is
  1242. ignored. (and a warning is printed during bootup)
  1243. source kernel/Kconfig.hz
  1244. config KEXEC
  1245. bool "kexec system call"
  1246. ---help---
  1247. kexec is a system call that implements the ability to shutdown your
  1248. current kernel, and to start another kernel. It is like a reboot
  1249. but it is independent of the system firmware. And like a reboot
  1250. you can start any kernel with it, not just Linux.
  1251. The name comes from the similarity to the exec system call.
  1252. It is an ongoing process to be certain the hardware in a machine
  1253. is properly shutdown, so do not be surprised if this code does not
  1254. initially work for you. It may help to enable device hotplugging
  1255. support. As of this writing the exact hardware interface is
  1256. strongly in flux, so no good recommendation can be made.
  1257. config CRASH_DUMP
  1258. bool "kernel crash dumps"
  1259. depends on X86_64 || (X86_32 && HIGHMEM)
  1260. ---help---
  1261. Generate crash dump after being started by kexec.
  1262. This should be normally only set in special crash dump kernels
  1263. which are loaded in the main kernel with kexec-tools into
  1264. a specially reserved region and then later executed after
  1265. a crash by kdump/kexec. The crash dump kernel must be compiled
  1266. to a memory address not used by the main kernel or BIOS using
  1267. PHYSICAL_START, or it must be built as a relocatable image
  1268. (CONFIG_RELOCATABLE=y).
  1269. For more details see Documentation/kdump/kdump.txt
  1270. config KEXEC_JUMP
  1271. bool "kexec jump (EXPERIMENTAL)"
  1272. depends on EXPERIMENTAL
  1273. depends on KEXEC && HIBERNATION
  1274. ---help---
  1275. Jump between original kernel and kexeced kernel and invoke
  1276. code in physical address mode via KEXEC
  1277. config PHYSICAL_START
  1278. hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
  1279. default "0x1000000"
  1280. ---help---
  1281. This gives the physical address where the kernel is loaded.
  1282. If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
  1283. bzImage will decompress itself to above physical address and
  1284. run from there. Otherwise, bzImage will run from the address where
  1285. it has been loaded by the boot loader and will ignore above physical
  1286. address.
  1287. In normal kdump cases one does not have to set/change this option
  1288. as now bzImage can be compiled as a completely relocatable image
  1289. (CONFIG_RELOCATABLE=y) and be used to load and run from a different
  1290. address. This option is mainly useful for the folks who don't want
  1291. to use a bzImage for capturing the crash dump and want to use a
  1292. vmlinux instead. vmlinux is not relocatable hence a kernel needs
  1293. to be specifically compiled to run from a specific memory area
  1294. (normally a reserved region) and this option comes handy.
  1295. So if you are using bzImage for capturing the crash dump,
  1296. leave the value here unchanged to 0x1000000 and set
  1297. CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
  1298. for capturing the crash dump change this value to start of
  1299. the reserved region. In other words, it can be set based on
  1300. the "X" value as specified in the "crashkernel=YM@XM"
  1301. command line boot parameter passed to the panic-ed
  1302. kernel. Please take a look at Documentation/kdump/kdump.txt
  1303. for more details about crash dumps.
  1304. Usage of bzImage for capturing the crash dump is recommended as
  1305. one does not have to build two kernels. Same kernel can be used
  1306. as production kernel and capture kernel. Above option should have
  1307. gone away after relocatable bzImage support is introduced. But it
  1308. is present because there are users out there who continue to use
  1309. vmlinux for dump capture. This option should go away down the
  1310. line.
  1311. Don't change this unless you know what you are doing.
  1312. config RELOCATABLE
  1313. bool "Build a relocatable kernel"
  1314. default y
  1315. ---help---
  1316. This builds a kernel image that retains relocation information
  1317. so it can be loaded someplace besides the default 1MB.
  1318. The relocations tend to make the kernel binary about 10% larger,
  1319. but are discarded at runtime.
  1320. One use is for the kexec on panic case where the recovery kernel
  1321. must live at a different physical address than the primary
  1322. kernel.
  1323. Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
  1324. it has been loaded at and the compile time physical address
  1325. (CONFIG_PHYSICAL_START) is ignored.
  1326. # Relocation on x86-32 needs some additional build support
  1327. config X86_NEED_RELOCS
  1328. def_bool y
  1329. depends on X86_32 && RELOCATABLE
  1330. config PHYSICAL_ALIGN
  1331. hex "Alignment value to which kernel should be aligned" if X86_32
  1332. default "0x1000000"
  1333. range 0x2000 0x1000000
  1334. ---help---
  1335. This value puts the alignment restrictions on physical address
  1336. where kernel is loaded and run from. Kernel is compiled for an
  1337. address which meets above alignment restriction.
  1338. If bootloader loads the kernel at a non-aligned address and
  1339. CONFIG_RELOCATABLE is set, kernel will move itself to nearest
  1340. address aligned to above value and run from there.
  1341. If bootloader loads the kernel at a non-aligned address and
  1342. CONFIG_RELOCATABLE is not set, kernel will ignore the run time
  1343. load address and decompress itself to the address it has been
  1344. compiled for and run from there. The address for which kernel is
  1345. compiled already meets above alignment restrictions. Hence the
  1346. end result is that kernel runs from a physical address meeting
  1347. above alignment restrictions.
  1348. Don't change this unless you know what you are doing.
  1349. config HOTPLUG_CPU
  1350. bool "Support for hot-pluggable CPUs"
  1351. depends on SMP && HOTPLUG
  1352. ---help---
  1353. Say Y here to allow turning CPUs off and on. CPUs can be
  1354. controlled through /sys/devices/system/cpu.
  1355. ( Note: power management support will enable this option
  1356. automatically on SMP systems. )
  1357. Say N if you want to disable CPU hotplug.
  1358. config COMPAT_VDSO
  1359. def_bool y
  1360. prompt "Compat VDSO support"
  1361. depends on X86_32 || IA32_EMULATION
  1362. ---help---
  1363. Map the 32-bit VDSO to the predictable old-style address too.
  1364. Say N here if you are running a sufficiently recent glibc
  1365. version (2.3.3 or later), to remove the high-mapped
  1366. VDSO mapping and to exclusively use the randomized VDSO.
  1367. If unsure, say Y.
  1368. config CMDLINE_BOOL
  1369. bool "Built-in kernel command line"
  1370. ---help---
  1371. Allow for specifying boot arguments to the kernel at
  1372. build time. On some systems (e.g. embedded ones), it is
  1373. necessary or convenient to provide some or all of the
  1374. kernel boot arguments with the kernel itself (that is,
  1375. to not rely on the boot loader to provide them.)
  1376. To compile command line arguments into the kernel,
  1377. set this option to 'Y', then fill in the
  1378. the boot arguments in CONFIG_CMDLINE.
  1379. Systems with fully functional boot loaders (i.e. non-embedded)
  1380. should leave this option set to 'N'.
  1381. config CMDLINE
  1382. string "Built-in kernel command string"
  1383. depends on CMDLINE_BOOL
  1384. default ""
  1385. ---help---
  1386. Enter arguments here that should be compiled into the kernel
  1387. image and used at boot time. If the boot loader provides a
  1388. command line at boot time, it is appended to this string to
  1389. form the full kernel command line, when the system boots.
  1390. However, you can use the CONFIG_CMDLINE_OVERRIDE option to
  1391. change this behavior.
  1392. In most cases, the command line (whether built-in or provided
  1393. by the boot loader) should specify the device for the root
  1394. file system.
  1395. config CMDLINE_OVERRIDE
  1396. bool "Built-in command line overrides boot loader arguments"
  1397. depends on CMDLINE_BOOL
  1398. ---help---
  1399. Set this option to 'Y' to have the kernel ignore the boot loader
  1400. command line, and use ONLY the built-in command line.
  1401. This is used to work around broken boot loaders. This should
  1402. be set to 'N' under normal conditions.
  1403. endmenu
  1404. config ARCH_ENABLE_MEMORY_HOTPLUG
  1405. def_bool y
  1406. depends on X86_64 || (X86_32 && HIGHMEM)
  1407. config ARCH_ENABLE_MEMORY_HOTREMOVE
  1408. def_bool y
  1409. depends on MEMORY_HOTPLUG
  1410. config HAVE_ARCH_EARLY_PFN_TO_NID
  1411. def_bool X86_64
  1412. depends on NUMA
  1413. config USE_PERCPU_NUMA_NODE_ID
  1414. def_bool X86_64
  1415. depends on NUMA
  1416. menu "Power management and ACPI options"
  1417. config ARCH_HIBERNATION_HEADER
  1418. def_bool y
  1419. depends on X86_64 && HIBERNATION
  1420. source "kernel/power/Kconfig"
  1421. source "drivers/acpi/Kconfig"
  1422. source "drivers/sfi/Kconfig"
  1423. config X86_APM_BOOT
  1424. def_bool y
  1425. depends on APM || APM_MODULE
  1426. menuconfig APM
  1427. tristate "APM (Advanced Power Management) BIOS support"
  1428. depends on X86_32 && PM_SLEEP
  1429. ---help---
  1430. APM is a BIOS specification for saving power using several different
  1431. techniques. This is mostly useful for battery powered laptops with
  1432. APM compliant BIOSes. If you say Y here, the system time will be
  1433. reset after a RESUME operation, the /proc/apm device will provide
  1434. battery status information, and user-space programs will receive
  1435. notification of APM "events" (e.g. battery status change).
  1436. If you select "Y" here, you can disable actual use of the APM
  1437. BIOS by passing the "apm=off" option to the kernel at boot time.
  1438. Note that the APM support is almost completely disabled for
  1439. machines with more than one CPU.
  1440. In order to use APM, you will need supporting software. For location
  1441. and more information, read <file:Documentation/power/pm.txt> and the
  1442. Battery Powered Linux mini-HOWTO, available from
  1443. <http://www.tldp.org/docs.html#howto>.
  1444. This driver does not spin down disk drives (see the hdparm(8)
  1445. manpage ("man 8 hdparm") for that), and it doesn't turn off
  1446. VESA-compliant "green" monitors.
  1447. This driver does not support the TI 4000M TravelMate and the ACER
  1448. 486/DX4/75 because they don't have compliant BIOSes. Many "green"
  1449. desktop machines also don't have compliant BIOSes, and this driver
  1450. may cause those machines to panic during the boot phase.
  1451. Generally, if you don't have a battery in your machine, there isn't
  1452. much point in using this driver and you should say N. If you get
  1453. random kernel OOPSes or reboots that don't seem to be related to
  1454. anything, try disabling/enabling this option (or disabling/enabling
  1455. APM in your BIOS).
  1456. Some other things you should try when experiencing seemingly random,
  1457. "weird" problems:
  1458. 1) make sure that you have enough swap space and that it is
  1459. enabled.
  1460. 2) pass the "no-hlt" option to the kernel
  1461. 3) switch on floating point emulation in the kernel and pass
  1462. the "no387" option to the kernel
  1463. 4) pass the "floppy=nodma" option to the kernel
  1464. 5) pass the "mem=4M" option to the kernel (thereby disabling
  1465. all but the first 4 MB of RAM)
  1466. 6) make sure that the CPU is not over clocked.
  1467. 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
  1468. 8) disable the cache from your BIOS settings
  1469. 9) install a fan for the video card or exchange video RAM
  1470. 10) install a better fan for the CPU
  1471. 11) exchange RAM chips
  1472. 12) exchange the motherboard.
  1473. To compile this driver as a module, choose M here: the
  1474. module will be called apm.
  1475. if APM
  1476. config APM_IGNORE_USER_SUSPEND
  1477. bool "Ignore USER SUSPEND"
  1478. ---help---
  1479. This option will ignore USER SUSPEND requests. On machines with a
  1480. compliant APM BIOS, you want to say N. However, on the NEC Versa M
  1481. series notebooks, it is necessary to say Y because of a BIOS bug.
  1482. config APM_DO_ENABLE
  1483. bool "Enable PM at boot time"
  1484. ---help---
  1485. Enable APM features at boot time. From page 36 of the APM BIOS
  1486. specification: "When disabled, the APM BIOS does not automatically
  1487. power manage devices, enter the Standby State, enter the Suspend
  1488. State, or take power saving steps in response to CPU Idle calls."
  1489. This driver will make CPU Idle calls when Linux is idle (unless this
  1490. feature is turned off -- see "Do CPU IDLE calls", below). This
  1491. should always save battery power, but more complicated APM features
  1492. will be dependent on your BIOS implementation. You may need to turn
  1493. this option off if your computer hangs at boot time when using APM
  1494. support, or if it beeps continuously instead of suspending. Turn
  1495. this off if you have a NEC UltraLite Versa 33/C or a Toshiba
  1496. T400CDT. This is off by default since most machines do fine without
  1497. this feature.
  1498. config APM_CPU_IDLE
  1499. bool "Make CPU Idle calls when idle"
  1500. ---help---
  1501. Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
  1502. On some machines, this can activate improved power savings, such as
  1503. a slowed CPU clock rate, when the machine is idle. These idle calls
  1504. are made after the idle loop has run for some length of time (e.g.,
  1505. 333 mS). On some machines, this will cause a hang at boot time or
  1506. whenever the CPU becomes idle. (On machines with more than one CPU,
  1507. this option does nothing.)
  1508. config APM_DISPLAY_BLANK
  1509. bool "Enable console blanking using APM"
  1510. ---help---
  1511. Enable console blanking using the APM. Some laptops can use this to
  1512. turn off the LCD backlight when the screen blanker of the Linux
  1513. virtual console blanks the screen. Note that this is only used by
  1514. the virtual console screen blanker, and won't turn off the backlight
  1515. when using the X Window system. This also doesn't have anything to
  1516. do with your VESA-compliant power-saving monitor. Further, this
  1517. option doesn't work for all laptops -- it might not turn off your
  1518. backlight at all, or it might print a lot of errors to the console,
  1519. especially if you are using gpm.
  1520. config APM_ALLOW_INTS
  1521. bool "Allow interrupts during APM BIOS calls"
  1522. ---help---
  1523. Normally we disable external interrupts while we are making calls to
  1524. the APM BIOS as a measure to lessen the effects of a badly behaving
  1525. BIOS implementation. The BIOS should reenable interrupts if it
  1526. needs to. Unfortunately, some BIOSes do not -- especially those in
  1527. many of the newer IBM Thinkpads. If you experience hangs when you
  1528. suspend, try setting this to Y. Otherwise, say N.
  1529. endif # APM
  1530. source "arch/x86/kernel/cpu/cpufreq/Kconfig"
  1531. source "drivers/cpuidle/Kconfig"
  1532. source "drivers/idle/Kconfig"
  1533. endmenu
  1534. menu "Bus options (PCI etc.)"
  1535. config PCI
  1536. bool "PCI support"
  1537. default y
  1538. select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
  1539. ---help---
  1540. Find out whether you have a PCI motherboard. PCI is the name of a
  1541. bus system, i.e. the way the CPU talks to the other stuff inside
  1542. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1543. VESA. If you have PCI, say Y, otherwise N.
  1544. choice
  1545. prompt "PCI access mode"
  1546. depends on X86_32 && PCI
  1547. default PCI_GOANY
  1548. ---help---
  1549. On PCI systems, the BIOS can be used to detect the PCI devices and
  1550. determine their configuration. However, some old PCI motherboards
  1551. have BIOS bugs and may crash if this is done. Also, some embedded
  1552. PCI-based systems don't have any BIOS at all. Linux can also try to
  1553. detect the PCI hardware directly without using the BIOS.
  1554. With this option, you can specify how Linux should detect the
  1555. PCI devices. If you choose "BIOS", the BIOS will be used,
  1556. if you choose "Direct", the BIOS won't be used, and if you
  1557. choose "MMConfig", then PCI Express MMCONFIG will be used.
  1558. If you choose "Any", the kernel will try MMCONFIG, then the
  1559. direct access method and falls back to the BIOS if that doesn't
  1560. work. If unsure, go with the default, which is "Any".
  1561. config PCI_GOBIOS
  1562. bool "BIOS"
  1563. config PCI_GOMMCONFIG
  1564. bool "MMConfig"
  1565. config PCI_GODIRECT
  1566. bool "Direct"
  1567. config PCI_GOOLPC
  1568. bool "OLPC XO-1"
  1569. depends on OLPC
  1570. config PCI_GOANY
  1571. bool "Any"
  1572. endchoice
  1573. config PCI_BIOS
  1574. def_bool y
  1575. depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
  1576. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  1577. config PCI_DIRECT
  1578. def_bool y
  1579. depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
  1580. config PCI_MMCONFIG
  1581. def_bool y
  1582. depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
  1583. config PCI_OLPC
  1584. def_bool y
  1585. depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
  1586. config PCI_XEN
  1587. def_bool y
  1588. depends on PCI && XEN
  1589. select SWIOTLB_XEN
  1590. config PCI_DOMAINS
  1591. def_bool y
  1592. depends on PCI
  1593. config PCI_MMCONFIG
  1594. bool "Support mmconfig PCI config space access"
  1595. depends on X86_64 && PCI && ACPI
  1596. config PCI_CNB20LE_QUIRK
  1597. bool "Read CNB20LE Host Bridge Windows"
  1598. depends on PCI
  1599. help
  1600. Read the PCI windows out of the CNB20LE host bridge. This allows
  1601. PCI hotplug to work on systems with the CNB20LE chipset which do
  1602. not have ACPI.
  1603. config DMAR
  1604. bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
  1605. depends on PCI_MSI && ACPI && EXPERIMENTAL
  1606. help
  1607. DMA remapping (DMAR) devices support enables independent address
  1608. translations for Direct Memory Access (DMA) from devices.
  1609. These DMA remapping devices are reported via ACPI tables
  1610. and include PCI device scope covered by these DMA
  1611. remapping devices.
  1612. config DMAR_DEFAULT_ON
  1613. def_bool y
  1614. prompt "Enable DMA Remapping Devices by default"
  1615. depends on DMAR
  1616. help
  1617. Selecting this option will enable a DMAR device at boot time if
  1618. one is found. If this option is not selected, DMAR support can
  1619. be enabled by passing intel_iommu=on to the kernel. It is
  1620. recommended you say N here while the DMAR code remains
  1621. experimental.
  1622. config DMAR_BROKEN_GFX_WA
  1623. bool "Workaround broken graphics drivers (going away soon)"
  1624. depends on DMAR && BROKEN
  1625. ---help---
  1626. Current Graphics drivers tend to use physical address
  1627. for DMA and avoid using DMA APIs. Setting this config
  1628. option permits the IOMMU driver to set a unity map for
  1629. all the OS-visible memory. Hence the driver can continue
  1630. to use physical addresses for DMA, at least until this
  1631. option is removed in the 2.6.32 kernel.
  1632. config DMAR_FLOPPY_WA
  1633. def_bool y
  1634. depends on DMAR
  1635. ---help---
  1636. Floppy disk drivers are known to bypass DMA API calls
  1637. thereby failing to work when IOMMU is enabled. This
  1638. workaround will setup a 1:1 mapping for the first
  1639. 16MiB to make floppy (an ISA device) work.
  1640. config INTR_REMAP
  1641. bool "Support for Interrupt Remapping (EXPERIMENTAL)"
  1642. depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
  1643. ---help---
  1644. Supports Interrupt remapping for IO-APIC and MSI devices.
  1645. To use x2apic mode in the CPU's which support x2APIC enhancements or
  1646. to support platforms with CPU's having > 8 bit APIC ID, say Y.
  1647. source "drivers/pci/pcie/Kconfig"
  1648. source "drivers/pci/Kconfig"
  1649. # x86_64 have no ISA slots, but do have ISA-style DMA.
  1650. config ISA_DMA_API
  1651. def_bool y
  1652. if X86_32
  1653. config ISA
  1654. bool "ISA support"
  1655. ---help---
  1656. Find out whether you have ISA slots on your motherboard. ISA is the
  1657. name of a bus system, i.e. the way the CPU talks to the other stuff
  1658. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1659. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1660. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1661. config EISA
  1662. bool "EISA support"
  1663. depends on ISA
  1664. ---help---
  1665. The Extended Industry Standard Architecture (EISA) bus was
  1666. developed as an open alternative to the IBM MicroChannel bus.
  1667. The EISA bus provided some of the features of the IBM MicroChannel
  1668. bus while maintaining backward compatibility with cards made for
  1669. the older ISA bus. The EISA bus saw limited use between 1988 and
  1670. 1995 when it was made obsolete by the PCI bus.
  1671. Say Y here if you are building a kernel for an EISA-based machine.
  1672. Otherwise, say N.
  1673. source "drivers/eisa/Kconfig"
  1674. config MCA
  1675. bool "MCA support"
  1676. ---help---
  1677. MicroChannel Architecture is found in some IBM PS/2 machines and
  1678. laptops. It is a bus system similar to PCI or ISA. See
  1679. <file:Documentation/mca.txt> (and especially the web page given
  1680. there) before attempting to build an MCA bus kernel.
  1681. source "drivers/mca/Kconfig"
  1682. config SCx200
  1683. tristate "NatSemi SCx200 support"
  1684. ---help---
  1685. This provides basic support for National Semiconductor's
  1686. (now AMD's) Geode processors. The driver probes for the
  1687. PCI-IDs of several on-chip devices, so its a good dependency
  1688. for other scx200_* drivers.
  1689. If compiled as a module, the driver is named scx200.
  1690. config SCx200HR_TIMER
  1691. tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
  1692. depends on SCx200
  1693. default y
  1694. ---help---
  1695. This driver provides a clocksource built upon the on-chip
  1696. 27MHz high-resolution timer. Its also a workaround for
  1697. NSC Geode SC-1100's buggy TSC, which loses time when the
  1698. processor goes idle (as is done by the scheduler). The
  1699. other workaround is idle=poll boot option.
  1700. config OLPC
  1701. bool "One Laptop Per Child support"
  1702. select GPIOLIB
  1703. select OLPC_OPENFIRMWARE
  1704. ---help---
  1705. Add support for detecting the unique features of the OLPC
  1706. XO hardware.
  1707. config OLPC_XO1
  1708. tristate "OLPC XO-1 support"
  1709. depends on OLPC && PCI
  1710. ---help---
  1711. Add support for non-essential features of the OLPC XO-1 laptop.
  1712. config OLPC_OPENFIRMWARE
  1713. bool "Support for OLPC's Open Firmware"
  1714. depends on !X86_64 && !X86_PAE
  1715. default n
  1716. help
  1717. This option adds support for the implementation of Open Firmware
  1718. that is used on the OLPC XO-1 Children's Machine.
  1719. If unsure, say N here.
  1720. endif # X86_32
  1721. config AMD_NB
  1722. def_bool y
  1723. depends on CPU_SUP_AMD && PCI
  1724. source "drivers/pcmcia/Kconfig"
  1725. source "drivers/pci/hotplug/Kconfig"
  1726. endmenu
  1727. menu "Executable file formats / Emulations"
  1728. source "fs/Kconfig.binfmt"
  1729. config IA32_EMULATION
  1730. bool "IA32 Emulation"
  1731. depends on X86_64
  1732. select COMPAT_BINFMT_ELF
  1733. ---help---
  1734. Include code to run 32-bit programs under a 64-bit kernel. You should
  1735. likely turn this on, unless you're 100% sure that you don't have any
  1736. 32-bit programs left.
  1737. config IA32_AOUT
  1738. tristate "IA32 a.out support"
  1739. depends on IA32_EMULATION
  1740. ---help---
  1741. Support old a.out binaries in the 32bit emulation.
  1742. config COMPAT
  1743. def_bool y
  1744. depends on IA32_EMULATION
  1745. config COMPAT_FOR_U64_ALIGNMENT
  1746. def_bool COMPAT
  1747. depends on X86_64
  1748. config SYSVIPC_COMPAT
  1749. def_bool y
  1750. depends on COMPAT && SYSVIPC
  1751. endmenu
  1752. config HAVE_ATOMIC_IOMAP
  1753. def_bool y
  1754. depends on X86_32
  1755. config HAVE_TEXT_POKE_SMP
  1756. bool
  1757. select STOP_MACHINE if SMP
  1758. source "net/Kconfig"
  1759. source "drivers/Kconfig"
  1760. source "drivers/firmware/Kconfig"
  1761. source "fs/Kconfig"
  1762. source "arch/x86/Kconfig.debug"
  1763. source "security/Kconfig"
  1764. source "crypto/Kconfig"
  1765. source "arch/x86/kvm/Kconfig"
  1766. source "lib/Kconfig"