Kconfig 66 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. 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 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_XZ
  52. select HAVE_KERNEL_LZO
  53. select HAVE_HW_BREAKPOINT
  54. select HAVE_MIXED_BREAKPOINTS_REGS
  55. select PERF_EVENTS
  56. select HAVE_PERF_EVENTS_NMI
  57. select ANON_INODES
  58. select HAVE_ARCH_KMEMCHECK
  59. select HAVE_USER_RETURN_NOTIFIER
  60. select HAVE_ARCH_JUMP_LABEL
  61. select HAVE_TEXT_POKE_SMP
  62. select HAVE_GENERIC_HARDIRQS
  63. select HAVE_SPARSE_IRQ
  64. select GENERIC_FIND_FIRST_BIT
  65. select GENERIC_IRQ_PROBE
  66. select GENERIC_PENDING_IRQ if SMP
  67. select GENERIC_IRQ_SHOW
  68. select IRQ_FORCED_THREADING
  69. select USE_GENERIC_SMP_HELPERS if SMP
  70. select HAVE_BPF_JIT if (X86_64 && NET)
  71. select CLKEVT_I8253
  72. config INSTRUCTION_DECODER
  73. def_bool (KPROBES || PERF_EVENTS)
  74. config OUTPUT_FORMAT
  75. string
  76. default "elf32-i386" if X86_32
  77. default "elf64-x86-64" if X86_64
  78. config ARCH_DEFCONFIG
  79. string
  80. default "arch/x86/configs/i386_defconfig" if X86_32
  81. default "arch/x86/configs/x86_64_defconfig" if X86_64
  82. config GENERIC_CMOS_UPDATE
  83. def_bool y
  84. config CLOCKSOURCE_WATCHDOG
  85. def_bool y
  86. config GENERIC_CLOCKEVENTS
  87. def_bool y
  88. config GENERIC_CLOCKEVENTS_BROADCAST
  89. def_bool y
  90. depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
  91. config LOCKDEP_SUPPORT
  92. def_bool y
  93. config STACKTRACE_SUPPORT
  94. def_bool y
  95. config HAVE_LATENCYTOP_SUPPORT
  96. def_bool y
  97. config MMU
  98. def_bool y
  99. config ZONE_DMA
  100. bool "DMA memory allocation support" if EXPERT
  101. default y
  102. help
  103. DMA memory allocation support allows devices with less than 32-bit
  104. addressing to allocate within the first 16MB of address space.
  105. Disable if no such devices will be used.
  106. If unsure, say Y.
  107. config SBUS
  108. bool
  109. config NEED_DMA_MAP_STATE
  110. def_bool (X86_64 || DMAR || DMA_API_DEBUG)
  111. config NEED_SG_DMA_LENGTH
  112. def_bool y
  113. config GENERIC_ISA_DMA
  114. def_bool ISA_DMA_API
  115. config GENERIC_IOMAP
  116. def_bool y
  117. config GENERIC_BUG
  118. def_bool y
  119. depends on BUG
  120. select GENERIC_BUG_RELATIVE_POINTERS if X86_64
  121. config GENERIC_BUG_RELATIVE_POINTERS
  122. bool
  123. config GENERIC_HWEIGHT
  124. def_bool y
  125. config GENERIC_GPIO
  126. bool
  127. config ARCH_MAY_HAVE_PC_FDC
  128. def_bool ISA_DMA_API
  129. config RWSEM_GENERIC_SPINLOCK
  130. def_bool !X86_XADD
  131. config RWSEM_XCHGADD_ALGORITHM
  132. def_bool X86_XADD
  133. config ARCH_HAS_CPU_IDLE_WAIT
  134. def_bool y
  135. config GENERIC_CALIBRATE_DELAY
  136. def_bool y
  137. config GENERIC_TIME_VSYSCALL
  138. bool
  139. default X86_64
  140. config ARCH_HAS_CPU_RELAX
  141. def_bool y
  142. config ARCH_HAS_DEFAULT_IDLE
  143. def_bool y
  144. config ARCH_HAS_CACHE_LINE_SIZE
  145. def_bool y
  146. config HAVE_SETUP_PER_CPU_AREA
  147. def_bool y
  148. config NEED_PER_CPU_EMBED_FIRST_CHUNK
  149. def_bool y
  150. config NEED_PER_CPU_PAGE_FIRST_CHUNK
  151. def_bool y
  152. config HAVE_CPUMASK_OF_CPU_MAP
  153. def_bool X86_64_SMP
  154. config ARCH_HIBERNATION_POSSIBLE
  155. def_bool y
  156. config ARCH_SUSPEND_POSSIBLE
  157. def_bool y
  158. config ZONE_DMA32
  159. bool
  160. default X86_64
  161. config ARCH_POPULATES_NODE_MAP
  162. def_bool y
  163. config AUDIT_ARCH
  164. bool
  165. default X86_64
  166. config ARCH_SUPPORTS_OPTIMIZED_INLINING
  167. def_bool y
  168. config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  169. def_bool y
  170. config HAVE_INTEL_TXT
  171. def_bool y
  172. depends on EXPERIMENTAL && DMAR && ACPI
  173. config X86_32_SMP
  174. def_bool y
  175. depends on X86_32 && SMP
  176. config X86_64_SMP
  177. def_bool y
  178. depends on X86_64 && SMP
  179. config X86_HT
  180. def_bool y
  181. depends on SMP
  182. config X86_32_LAZY_GS
  183. def_bool y
  184. depends on X86_32 && !CC_STACKPROTECTOR
  185. config ARCH_HWEIGHT_CFLAGS
  186. string
  187. default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
  188. 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
  189. config KTIME_SCALAR
  190. def_bool X86_32
  191. config ARCH_CPU_PROBE_RELEASE
  192. def_bool y
  193. depends on HOTPLUG_CPU
  194. source "init/Kconfig"
  195. source "kernel/Kconfig.freezer"
  196. menu "Processor type and features"
  197. source "kernel/time/Kconfig"
  198. config SMP
  199. bool "Symmetric multi-processing support"
  200. ---help---
  201. This enables support for systems with more than one CPU. If you have
  202. a system with only one CPU, like most personal computers, say N. If
  203. you have a system with more than one CPU, say Y.
  204. If you say N here, the kernel will run on single and multiprocessor
  205. machines, but will use only one CPU of a multiprocessor machine. If
  206. you say Y here, the kernel will run on many, but not all,
  207. singleprocessor machines. On a singleprocessor machine, the kernel
  208. will run faster if you say N here.
  209. Note that if you say Y here and choose architecture "586" or
  210. "Pentium" under "Processor family", the kernel will not work on 486
  211. architectures. Similarly, multiprocessor kernels for the "PPro"
  212. architecture may not work on all Pentium based boards.
  213. People using multiprocessor machines who say Y here should also say
  214. Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
  215. Management" code will be disabled if you say Y here.
  216. See also <file:Documentation/i386/IO-APIC.txt>,
  217. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  218. <http://www.tldp.org/docs.html#howto>.
  219. If you don't know what to do here, say N.
  220. config X86_X2APIC
  221. bool "Support x2apic"
  222. depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
  223. ---help---
  224. This enables x2apic support on CPUs that have this feature.
  225. This allows 32-bit apic IDs (so it can support very large systems),
  226. and accesses the local apic via MSRs not via mmio.
  227. If you don't know what to do here, say N.
  228. config X86_MPPARSE
  229. bool "Enable MPS table" if ACPI
  230. default y
  231. depends on X86_LOCAL_APIC
  232. ---help---
  233. For old smp systems that do not have proper acpi support. Newer systems
  234. (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
  235. config X86_BIGSMP
  236. bool "Support for big SMP systems with more than 8 CPUs"
  237. depends on X86_32 && SMP
  238. ---help---
  239. This option is needed for the systems that have more than 8 CPUs
  240. if X86_32
  241. config X86_EXTENDED_PLATFORM
  242. bool "Support for extended (non-PC) x86 platforms"
  243. default y
  244. ---help---
  245. If you disable this option then the kernel will only support
  246. standard PC platforms. (which covers the vast majority of
  247. systems out there.)
  248. If you enable this option then you'll be able to select support
  249. for the following (non-PC) 32 bit x86 platforms:
  250. AMD Elan
  251. NUMAQ (IBM/Sequent)
  252. RDC R-321x SoC
  253. SGI 320/540 (Visual Workstation)
  254. Summit/EXA (IBM x440)
  255. Unisys ES7000 IA32 series
  256. Moorestown MID devices
  257. If you have one of these systems, or if you want to build a
  258. generic distribution kernel, say Y here - otherwise say N.
  259. endif
  260. if X86_64
  261. config X86_EXTENDED_PLATFORM
  262. bool "Support for extended (non-PC) x86 platforms"
  263. default y
  264. ---help---
  265. If you disable this option then the kernel will only support
  266. standard PC platforms. (which covers the vast majority of
  267. systems out there.)
  268. If you enable this option then you'll be able to select support
  269. for the following (non-PC) 64 bit x86 platforms:
  270. ScaleMP vSMP
  271. SGI Ultraviolet
  272. If you have one of these systems, or if you want to build a
  273. generic distribution kernel, say Y here - otherwise say N.
  274. endif
  275. # This is an alphabetically sorted list of 64 bit extended platforms
  276. # Please maintain the alphabetic order if and when there are additions
  277. config X86_VSMP
  278. bool "ScaleMP vSMP"
  279. select PARAVIRT_GUEST
  280. select PARAVIRT
  281. depends on X86_64 && PCI
  282. depends on X86_EXTENDED_PLATFORM
  283. ---help---
  284. Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
  285. supposed to run on these EM64T-based machines. Only choose this option
  286. if you have one of these machines.
  287. config X86_UV
  288. bool "SGI Ultraviolet"
  289. depends on X86_64
  290. depends on X86_EXTENDED_PLATFORM
  291. depends on NUMA
  292. depends on X86_X2APIC
  293. ---help---
  294. This option is needed in order to support SGI Ultraviolet systems.
  295. If you don't have one of these, you should say N here.
  296. # Following is an alphabetically sorted list of 32 bit extended platforms
  297. # Please maintain the alphabetic order if and when there are additions
  298. config X86_INTEL_CE
  299. bool "CE4100 TV platform"
  300. depends on PCI
  301. depends on PCI_GODIRECT
  302. depends on X86_32
  303. depends on X86_EXTENDED_PLATFORM
  304. select X86_REBOOTFIXUPS
  305. select OF
  306. select OF_EARLY_FLATTREE
  307. ---help---
  308. Select for the Intel CE media processor (CE4100) SOC.
  309. This option compiles in support for the CE4100 SOC for settop
  310. boxes and media devices.
  311. config X86_MRST
  312. bool "Moorestown MID platform"
  313. depends on PCI
  314. depends on PCI_GOANY
  315. depends on X86_32
  316. depends on X86_EXTENDED_PLATFORM
  317. depends on X86_IO_APIC
  318. select APB_TIMER
  319. select I2C
  320. select SPI
  321. select INTEL_SCU_IPC
  322. select X86_PLATFORM_DEVICES
  323. ---help---
  324. Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
  325. Internet Device(MID) platform. Moorestown consists of two chips:
  326. Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
  327. Unlike standard x86 PCs, Moorestown does not have many legacy devices
  328. nor standard legacy replacement devices/features. e.g. Moorestown does
  329. not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
  330. config X86_RDC321X
  331. bool "RDC R-321x SoC"
  332. depends on X86_32
  333. depends on X86_EXTENDED_PLATFORM
  334. select M486
  335. select X86_REBOOTFIXUPS
  336. ---help---
  337. This option is needed for RDC R-321x system-on-chip, also known
  338. as R-8610-(G).
  339. If you don't have one of these chips, you should say N here.
  340. config X86_32_NON_STANDARD
  341. bool "Support non-standard 32-bit SMP architectures"
  342. depends on X86_32 && SMP
  343. depends on X86_EXTENDED_PLATFORM
  344. ---help---
  345. This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
  346. subarchitectures. It is intended for a generic binary kernel.
  347. if you select them all, kernel will probe it one by one. and will
  348. fallback to default.
  349. # Alphabetically sorted list of Non standard 32 bit platforms
  350. config X86_NUMAQ
  351. bool "NUMAQ (IBM/Sequent)"
  352. depends on X86_32_NON_STANDARD
  353. depends on PCI
  354. select NUMA
  355. select X86_MPPARSE
  356. ---help---
  357. This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
  358. NUMA multiquad box. This changes the way that processors are
  359. bootstrapped, and uses Clustered Logical APIC addressing mode instead
  360. of Flat Logical. You will need a new lynxer.elf file to flash your
  361. firmware with - send email to <Martin.Bligh@us.ibm.com>.
  362. config X86_SUPPORTS_MEMORY_FAILURE
  363. def_bool y
  364. # MCE code calls memory_failure():
  365. depends on X86_MCE
  366. # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
  367. depends on !X86_NUMAQ
  368. # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
  369. depends on X86_64 || !SPARSEMEM
  370. select ARCH_SUPPORTS_MEMORY_FAILURE
  371. config X86_VISWS
  372. bool "SGI 320/540 (Visual Workstation)"
  373. depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
  374. depends on X86_32_NON_STANDARD
  375. ---help---
  376. The SGI Visual Workstation series is an IA32-based workstation
  377. based on SGI systems chips with some legacy PC hardware attached.
  378. Say Y here to create a kernel to run on the SGI 320 or 540.
  379. A kernel compiled for the Visual Workstation will run on general
  380. PCs as well. See <file:Documentation/sgi-visws.txt> for details.
  381. config X86_SUMMIT
  382. bool "Summit/EXA (IBM x440)"
  383. depends on X86_32_NON_STANDARD
  384. ---help---
  385. This option is needed for IBM systems that use the Summit/EXA chipset.
  386. In particular, it is needed for the x440.
  387. config X86_ES7000
  388. bool "Unisys ES7000 IA32 series"
  389. depends on X86_32_NON_STANDARD && X86_BIGSMP
  390. ---help---
  391. Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
  392. supposed to run on an IA32-based Unisys ES7000 system.
  393. config X86_32_IRIS
  394. tristate "Eurobraille/Iris poweroff module"
  395. depends on X86_32
  396. ---help---
  397. The Iris machines from EuroBraille do not have APM or ACPI support
  398. to shut themselves down properly. A special I/O sequence is
  399. needed to do so, which is what this module does at
  400. kernel shutdown.
  401. This is only for Iris machines from EuroBraille.
  402. If unused, say N.
  403. config SCHED_OMIT_FRAME_POINTER
  404. def_bool y
  405. prompt "Single-depth WCHAN output"
  406. depends on X86
  407. ---help---
  408. Calculate simpler /proc/<PID>/wchan values. If this option
  409. is disabled then wchan values will recurse back to the
  410. caller function. This provides more accurate wchan values,
  411. at the expense of slightly more scheduling overhead.
  412. If in doubt, say "Y".
  413. menuconfig PARAVIRT_GUEST
  414. bool "Paravirtualized guest support"
  415. ---help---
  416. Say Y here to get to see options related to running Linux under
  417. various hypervisors. This option alone does not add any kernel code.
  418. If you say N, all options in this submenu will be skipped and disabled.
  419. if PARAVIRT_GUEST
  420. source "arch/x86/xen/Kconfig"
  421. config KVM_CLOCK
  422. bool "KVM paravirtualized clock"
  423. select PARAVIRT
  424. select PARAVIRT_CLOCK
  425. ---help---
  426. Turning on this option will allow you to run a paravirtualized clock
  427. when running over the KVM hypervisor. Instead of relying on a PIT
  428. (or probably other) emulation by the underlying device model, the host
  429. provides the guest with timing infrastructure such as time of day, and
  430. system time
  431. config KVM_GUEST
  432. bool "KVM Guest support"
  433. select PARAVIRT
  434. ---help---
  435. This option enables various optimizations for running under the KVM
  436. hypervisor.
  437. source "arch/x86/lguest/Kconfig"
  438. config PARAVIRT
  439. bool "Enable paravirtualization code"
  440. ---help---
  441. This changes the kernel so it can modify itself when it is run
  442. under a hypervisor, potentially improving performance significantly
  443. over full virtualization. However, when run without a hypervisor
  444. the kernel is theoretically slower and slightly larger.
  445. config PARAVIRT_SPINLOCKS
  446. bool "Paravirtualization layer for spinlocks"
  447. depends on PARAVIRT && SMP && EXPERIMENTAL
  448. ---help---
  449. Paravirtualized spinlocks allow a pvops backend to replace the
  450. spinlock implementation with something virtualization-friendly
  451. (for example, block the virtual CPU rather than spinning).
  452. Unfortunately the downside is an up to 5% performance hit on
  453. native kernels, with various workloads.
  454. If you are unsure how to answer this question, answer N.
  455. config PARAVIRT_CLOCK
  456. bool
  457. endif
  458. config PARAVIRT_DEBUG
  459. bool "paravirt-ops debugging"
  460. depends on PARAVIRT && DEBUG_KERNEL
  461. ---help---
  462. Enable to debug paravirt_ops internals. Specifically, BUG if
  463. a paravirt_op is missing when it is called.
  464. config NO_BOOTMEM
  465. def_bool y
  466. config MEMTEST
  467. bool "Memtest"
  468. ---help---
  469. This option adds a kernel parameter 'memtest', which allows memtest
  470. to be set.
  471. memtest=0, mean disabled; -- default
  472. memtest=1, mean do 1 test pattern;
  473. ...
  474. memtest=4, mean do 4 test patterns.
  475. If you are unsure how to answer this question, answer N.
  476. config X86_SUMMIT_NUMA
  477. def_bool y
  478. depends on X86_32 && NUMA && X86_32_NON_STANDARD
  479. config X86_CYCLONE_TIMER
  480. def_bool y
  481. depends on X86_32_NON_STANDARD
  482. source "arch/x86/Kconfig.cpu"
  483. config HPET_TIMER
  484. def_bool X86_64
  485. prompt "HPET Timer Support" if X86_32
  486. ---help---
  487. Use the IA-PC HPET (High Precision Event Timer) to manage
  488. time in preference to the PIT and RTC, if a HPET is
  489. present.
  490. HPET is the next generation timer replacing legacy 8254s.
  491. The HPET provides a stable time base on SMP
  492. systems, unlike the TSC, but it is more expensive to access,
  493. as it is off-chip. You can find the HPET spec at
  494. <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
  495. You can safely choose Y here. However, HPET will only be
  496. activated if the platform and the BIOS support this feature.
  497. Otherwise the 8254 will be used for timing services.
  498. Choose N to continue using the legacy 8254 timer.
  499. config HPET_EMULATE_RTC
  500. def_bool y
  501. depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
  502. config APB_TIMER
  503. def_bool y if MRST
  504. prompt "Langwell APB Timer Support" if X86_MRST
  505. help
  506. APB timer is the replacement for 8254, HPET on X86 MID platforms.
  507. The APBT provides a stable time base on SMP
  508. systems, unlike the TSC, but it is more expensive to access,
  509. as it is off-chip. APB timers are always running regardless of CPU
  510. C states, they are used as per CPU clockevent device when possible.
  511. # Mark as expert because too many people got it wrong.
  512. # The code disables itself when not needed.
  513. config DMI
  514. default y
  515. bool "Enable DMI scanning" if EXPERT
  516. ---help---
  517. Enabled scanning of DMI to identify machine quirks. Say Y
  518. here unless you have verified that your setup is not
  519. affected by entries in the DMI blacklist. Required by PNP
  520. BIOS code.
  521. config GART_IOMMU
  522. bool "GART IOMMU support" if EXPERT
  523. default y
  524. select SWIOTLB
  525. depends on X86_64 && PCI && AMD_NB
  526. ---help---
  527. Support for full DMA access of devices with 32bit memory access only
  528. on systems with more than 3GB. This is usually needed for USB,
  529. sound, many IDE/SATA chipsets and some other devices.
  530. Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
  531. based hardware IOMMU and a software bounce buffer based IOMMU used
  532. on Intel systems and as fallback.
  533. The code is only active when needed (enough memory and limited
  534. device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
  535. too.
  536. config CALGARY_IOMMU
  537. bool "IBM Calgary IOMMU support"
  538. select SWIOTLB
  539. depends on X86_64 && PCI && EXPERIMENTAL
  540. ---help---
  541. Support for hardware IOMMUs in IBM's xSeries x366 and x460
  542. systems. Needed to run systems with more than 3GB of memory
  543. properly with 32-bit PCI devices that do not support DAC
  544. (Double Address Cycle). Calgary also supports bus level
  545. isolation, where all DMAs pass through the IOMMU. This
  546. prevents them from going anywhere except their intended
  547. destination. This catches hard-to-find kernel bugs and
  548. mis-behaving drivers and devices that do not use the DMA-API
  549. properly to set up their DMA buffers. The IOMMU can be
  550. turned off at boot time with the iommu=off parameter.
  551. Normally the kernel will make the right choice by itself.
  552. If unsure, say Y.
  553. config CALGARY_IOMMU_ENABLED_BY_DEFAULT
  554. def_bool y
  555. prompt "Should Calgary be enabled by default?"
  556. depends on CALGARY_IOMMU
  557. ---help---
  558. Should Calgary be enabled by default? if you choose 'y', Calgary
  559. will be used (if it exists). If you choose 'n', Calgary will not be
  560. used even if it exists. If you choose 'n' and would like to use
  561. Calgary anyway, pass 'iommu=calgary' on the kernel command line.
  562. If unsure, say Y.
  563. # need this always selected by IOMMU for the VIA workaround
  564. config SWIOTLB
  565. def_bool y if X86_64
  566. ---help---
  567. Support for software bounce buffers used on x86-64 systems
  568. which don't have a hardware IOMMU (e.g. the current generation
  569. of Intel's x86-64 CPUs). Using this PCI devices which can only
  570. access 32-bits of memory can be used on systems with more than
  571. 3 GB of memory. If unsure, say Y.
  572. config IOMMU_HELPER
  573. def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
  574. config MAXSMP
  575. bool "Enable Maximum number of SMP Processors and NUMA Nodes"
  576. depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
  577. select CPUMASK_OFFSTACK
  578. ---help---
  579. Enable maximum number of CPUS and NUMA Nodes for this architecture.
  580. If unsure, say N.
  581. config NR_CPUS
  582. int "Maximum number of CPUs" if SMP && !MAXSMP
  583. range 2 8 if SMP && X86_32 && !X86_BIGSMP
  584. range 2 512 if SMP && !MAXSMP
  585. default "1" if !SMP
  586. default "4096" if MAXSMP
  587. default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
  588. default "8" if SMP
  589. ---help---
  590. This allows you to specify the maximum number of CPUs which this
  591. kernel will support. The maximum supported value is 512 and the
  592. minimum value which makes sense is 2.
  593. This is purely to save memory - each supported CPU adds
  594. approximately eight kilobytes to the kernel image.
  595. config SCHED_SMT
  596. bool "SMT (Hyperthreading) scheduler support"
  597. depends on X86_HT
  598. ---help---
  599. SMT scheduler support improves the CPU scheduler's decision making
  600. when dealing with Intel Pentium 4 chips with HyperThreading at a
  601. cost of slightly increased overhead in some places. If unsure say
  602. N here.
  603. config SCHED_MC
  604. def_bool y
  605. prompt "Multi-core scheduler support"
  606. depends on X86_HT
  607. ---help---
  608. Multi-core scheduler support improves the CPU scheduler's decision
  609. making when dealing with multi-core CPU chips at a cost of slightly
  610. increased overhead in some places. If unsure say N here.
  611. config IRQ_TIME_ACCOUNTING
  612. bool "Fine granularity task level IRQ time accounting"
  613. default n
  614. ---help---
  615. Select this option to enable fine granularity task irq time
  616. accounting. This is done by reading a timestamp on each
  617. transitions between softirq and hardirq state, so there can be a
  618. small performance impact.
  619. If in doubt, say N here.
  620. source "kernel/Kconfig.preempt"
  621. config X86_UP_APIC
  622. bool "Local APIC support on uniprocessors"
  623. depends on X86_32 && !SMP && !X86_32_NON_STANDARD
  624. ---help---
  625. A local APIC (Advanced Programmable Interrupt Controller) is an
  626. integrated interrupt controller in the CPU. If you have a single-CPU
  627. system which has a processor with a local APIC, you can say Y here to
  628. enable and use it. If you say Y here even though your machine doesn't
  629. have a local APIC, then the kernel will still run with no slowdown at
  630. all. The local APIC supports CPU-generated self-interrupts (timer,
  631. performance counters), and the NMI watchdog which detects hard
  632. lockups.
  633. config X86_UP_IOAPIC
  634. bool "IO-APIC support on uniprocessors"
  635. depends on X86_UP_APIC
  636. ---help---
  637. An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
  638. SMP-capable replacement for PC-style interrupt controllers. Most
  639. SMP systems and many recent uniprocessor systems have one.
  640. If you have a single-CPU system with an IO-APIC, you can say Y here
  641. to use it. If you say Y here even though your machine doesn't have
  642. an IO-APIC, then the kernel will still run with no slowdown at all.
  643. config X86_LOCAL_APIC
  644. def_bool y
  645. depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
  646. config X86_IO_APIC
  647. def_bool y
  648. depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
  649. config X86_VISWS_APIC
  650. def_bool y
  651. depends on X86_32 && X86_VISWS
  652. config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
  653. bool "Reroute for broken boot IRQs"
  654. depends on X86_IO_APIC
  655. ---help---
  656. This option enables a workaround that fixes a source of
  657. spurious interrupts. This is recommended when threaded
  658. interrupt handling is used on systems where the generation of
  659. superfluous "boot interrupts" cannot be disabled.
  660. Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
  661. entry in the chipset's IO-APIC is masked (as, e.g. the RT
  662. kernel does during interrupt handling). On chipsets where this
  663. boot IRQ generation cannot be disabled, this workaround keeps
  664. the original IRQ line masked so that only the equivalent "boot
  665. IRQ" is delivered to the CPUs. The workaround also tells the
  666. kernel to set up the IRQ handler on the boot IRQ line. In this
  667. way only one interrupt is delivered to the kernel. Otherwise
  668. the spurious second interrupt may cause the kernel to bring
  669. down (vital) interrupt lines.
  670. Only affects "broken" chipsets. Interrupt sharing may be
  671. increased on these systems.
  672. config X86_MCE
  673. bool "Machine Check / overheating reporting"
  674. ---help---
  675. Machine Check support allows the processor to notify the
  676. kernel if it detects a problem (e.g. overheating, data corruption).
  677. The action the kernel takes depends on the severity of the problem,
  678. ranging from warning messages to halting the machine.
  679. config X86_MCE_INTEL
  680. def_bool y
  681. prompt "Intel MCE features"
  682. depends on X86_MCE && X86_LOCAL_APIC
  683. ---help---
  684. Additional support for intel specific MCE features such as
  685. the thermal monitor.
  686. config X86_MCE_AMD
  687. def_bool y
  688. prompt "AMD MCE features"
  689. depends on X86_MCE && X86_LOCAL_APIC
  690. ---help---
  691. Additional support for AMD specific MCE features such as
  692. the DRAM Error Threshold.
  693. config X86_ANCIENT_MCE
  694. bool "Support for old Pentium 5 / WinChip machine checks"
  695. depends on X86_32 && X86_MCE
  696. ---help---
  697. Include support for machine check handling on old Pentium 5 or WinChip
  698. systems. These typically need to be enabled explicitely on the command
  699. line.
  700. config X86_MCE_THRESHOLD
  701. depends on X86_MCE_AMD || X86_MCE_INTEL
  702. def_bool y
  703. config X86_MCE_INJECT
  704. depends on X86_MCE
  705. tristate "Machine check injector support"
  706. ---help---
  707. Provide support for injecting machine checks for testing purposes.
  708. If you don't know what a machine check is and you don't do kernel
  709. QA it is safe to say n.
  710. config X86_THERMAL_VECTOR
  711. def_bool y
  712. depends on X86_MCE_INTEL
  713. config VM86
  714. bool "Enable VM86 support" if EXPERT
  715. default y
  716. depends on X86_32
  717. ---help---
  718. This option is required by programs like DOSEMU to run 16-bit legacy
  719. code on X86 processors. It also may be needed by software like
  720. XFree86 to initialize some video cards via BIOS. Disabling this
  721. option saves about 6k.
  722. config TOSHIBA
  723. tristate "Toshiba Laptop support"
  724. depends on X86_32
  725. ---help---
  726. This adds a driver to safely access the System Management Mode of
  727. the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
  728. not work on models with a Phoenix BIOS. The System Management Mode
  729. is used to set the BIOS and power saving options on Toshiba portables.
  730. For information on utilities to make use of this driver see the
  731. Toshiba Linux utilities web site at:
  732. <http://www.buzzard.org.uk/toshiba/>.
  733. Say Y if you intend to run this kernel on a Toshiba portable.
  734. Say N otherwise.
  735. config I8K
  736. tristate "Dell laptop support"
  737. select HWMON
  738. ---help---
  739. This adds a driver to safely access the System Management Mode
  740. of the CPU on the Dell Inspiron 8000. The System Management Mode
  741. is used to read cpu temperature and cooling fan status and to
  742. control the fans on the I8K portables.
  743. This driver has been tested only on the Inspiron 8000 but it may
  744. also work with other Dell laptops. You can force loading on other
  745. models by passing the parameter `force=1' to the module. Use at
  746. your own risk.
  747. For information on utilities to make use of this driver see the
  748. I8K Linux utilities web site at:
  749. <http://people.debian.org/~dz/i8k/>
  750. Say Y if you intend to run this kernel on a Dell Inspiron 8000.
  751. Say N otherwise.
  752. config X86_REBOOTFIXUPS
  753. bool "Enable X86 board specific fixups for reboot"
  754. depends on X86_32
  755. ---help---
  756. This enables chipset and/or board specific fixups to be done
  757. in order to get reboot to work correctly. This is only needed on
  758. some combinations of hardware and BIOS. The symptom, for which
  759. this config is intended, is when reboot ends with a stalled/hung
  760. system.
  761. Currently, the only fixup is for the Geode machines using
  762. CS5530A and CS5536 chipsets and the RDC R-321x SoC.
  763. Say Y if you want to enable the fixup. Currently, it's safe to
  764. enable this option even if you don't need it.
  765. Say N otherwise.
  766. config MICROCODE
  767. tristate "/dev/cpu/microcode - microcode support"
  768. select FW_LOADER
  769. ---help---
  770. If you say Y here, you will be able to update the microcode on
  771. certain Intel and AMD processors. The Intel support is for the
  772. IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
  773. Pentium 4, Xeon etc. The AMD support is for family 0x10 and
  774. 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
  775. You will obviously need the actual microcode binary data itself
  776. which is not shipped with the Linux kernel.
  777. This option selects the general module only, you need to select
  778. at least one vendor specific module as well.
  779. To compile this driver as a module, choose M here: the
  780. module will be called microcode.
  781. config MICROCODE_INTEL
  782. bool "Intel microcode patch loading support"
  783. depends on MICROCODE
  784. default MICROCODE
  785. select FW_LOADER
  786. ---help---
  787. This options enables microcode patch loading support for Intel
  788. processors.
  789. For latest news and information on obtaining all the required
  790. Intel ingredients for this driver, check:
  791. <http://www.urbanmyth.org/microcode/>.
  792. config MICROCODE_AMD
  793. bool "AMD microcode patch loading support"
  794. depends on MICROCODE
  795. select FW_LOADER
  796. ---help---
  797. If you select this option, microcode patch loading support for AMD
  798. processors will be enabled.
  799. config MICROCODE_OLD_INTERFACE
  800. def_bool y
  801. depends on MICROCODE
  802. config X86_MSR
  803. tristate "/dev/cpu/*/msr - Model-specific register support"
  804. ---help---
  805. This device gives privileged processes access to the x86
  806. Model-Specific Registers (MSRs). It is a character device with
  807. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  808. MSR accesses are directed to a specific CPU on multi-processor
  809. systems.
  810. config X86_CPUID
  811. tristate "/dev/cpu/*/cpuid - CPU information support"
  812. ---help---
  813. This device gives processes access to the x86 CPUID instruction to
  814. be executed on a specific processor. It is a character device
  815. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  816. /dev/cpu/31/cpuid.
  817. choice
  818. prompt "High Memory Support"
  819. default HIGHMEM64G if X86_NUMAQ
  820. default HIGHMEM4G
  821. depends on X86_32
  822. config NOHIGHMEM
  823. bool "off"
  824. depends on !X86_NUMAQ
  825. ---help---
  826. Linux can use up to 64 Gigabytes of physical memory on x86 systems.
  827. However, the address space of 32-bit x86 processors is only 4
  828. Gigabytes large. That means that, if you have a large amount of
  829. physical memory, not all of it can be "permanently mapped" by the
  830. kernel. The physical memory that's not permanently mapped is called
  831. "high memory".
  832. If you are compiling a kernel which will never run on a machine with
  833. more than 1 Gigabyte total physical RAM, answer "off" here (default
  834. choice and suitable for most users). This will result in a "3GB/1GB"
  835. split: 3GB are mapped so that each process sees a 3GB virtual memory
  836. space and the remaining part of the 4GB virtual memory space is used
  837. by the kernel to permanently map as much physical memory as
  838. possible.
  839. If the machine has between 1 and 4 Gigabytes physical RAM, then
  840. answer "4GB" here.
  841. If more than 4 Gigabytes is used then answer "64GB" here. This
  842. selection turns Intel PAE (Physical Address Extension) mode on.
  843. PAE implements 3-level paging on IA32 processors. PAE is fully
  844. supported by Linux, PAE mode is implemented on all recent Intel
  845. processors (Pentium Pro and better). NOTE: If you say "64GB" here,
  846. then the kernel will not boot on CPUs that don't support PAE!
  847. The actual amount of total physical memory will either be
  848. auto detected or can be forced by using a kernel command line option
  849. such as "mem=256M". (Try "man bootparam" or see the documentation of
  850. your boot loader (lilo or loadlin) about how to pass options to the
  851. kernel at boot time.)
  852. If unsure, say "off".
  853. config HIGHMEM4G
  854. bool "4GB"
  855. depends on !X86_NUMAQ
  856. ---help---
  857. Select this if you have a 32-bit processor and between 1 and 4
  858. gigabytes of physical RAM.
  859. config HIGHMEM64G
  860. bool "64GB"
  861. depends on !M386 && !M486
  862. select X86_PAE
  863. ---help---
  864. Select this if you have a 32-bit processor and more than 4
  865. gigabytes of physical RAM.
  866. endchoice
  867. choice
  868. depends on EXPERIMENTAL
  869. prompt "Memory split" if EXPERT
  870. default VMSPLIT_3G
  871. depends on X86_32
  872. ---help---
  873. Select the desired split between kernel and user memory.
  874. If the address range available to the kernel is less than the
  875. physical memory installed, the remaining memory will be available
  876. as "high memory". Accessing high memory is a little more costly
  877. than low memory, as it needs to be mapped into the kernel first.
  878. Note that increasing the kernel address space limits the range
  879. available to user programs, making the address space there
  880. tighter. Selecting anything other than the default 3G/1G split
  881. will also likely make your kernel incompatible with binary-only
  882. kernel modules.
  883. If you are not absolutely sure what you are doing, leave this
  884. option alone!
  885. config VMSPLIT_3G
  886. bool "3G/1G user/kernel split"
  887. config VMSPLIT_3G_OPT
  888. depends on !X86_PAE
  889. bool "3G/1G user/kernel split (for full 1G low memory)"
  890. config VMSPLIT_2G
  891. bool "2G/2G user/kernel split"
  892. config VMSPLIT_2G_OPT
  893. depends on !X86_PAE
  894. bool "2G/2G user/kernel split (for full 2G low memory)"
  895. config VMSPLIT_1G
  896. bool "1G/3G user/kernel split"
  897. endchoice
  898. config PAGE_OFFSET
  899. hex
  900. default 0xB0000000 if VMSPLIT_3G_OPT
  901. default 0x80000000 if VMSPLIT_2G
  902. default 0x78000000 if VMSPLIT_2G_OPT
  903. default 0x40000000 if VMSPLIT_1G
  904. default 0xC0000000
  905. depends on X86_32
  906. config HIGHMEM
  907. def_bool y
  908. depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
  909. config X86_PAE
  910. bool "PAE (Physical Address Extension) Support"
  911. depends on X86_32 && !HIGHMEM4G
  912. ---help---
  913. PAE is required for NX support, and furthermore enables
  914. larger swapspace support for non-overcommit purposes. It
  915. has the cost of more pagetable lookup overhead, and also
  916. consumes more pagetable space per process.
  917. config ARCH_PHYS_ADDR_T_64BIT
  918. def_bool X86_64 || X86_PAE
  919. config ARCH_DMA_ADDR_T_64BIT
  920. def_bool X86_64 || HIGHMEM64G
  921. config DIRECT_GBPAGES
  922. bool "Enable 1GB pages for kernel pagetables" if EXPERT
  923. default y
  924. depends on X86_64
  925. ---help---
  926. Allow the kernel linear mapping to use 1GB pages on CPUs that
  927. support it. This can improve the kernel's performance a tiny bit by
  928. reducing TLB pressure. If in doubt, say "Y".
  929. # Common NUMA Features
  930. config NUMA
  931. bool "Numa Memory Allocation and Scheduler Support"
  932. depends on SMP
  933. depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
  934. default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
  935. ---help---
  936. Enable NUMA (Non Uniform Memory Access) support.
  937. The kernel will try to allocate memory used by a CPU on the
  938. local memory controller of the CPU and add some more
  939. NUMA awareness to the kernel.
  940. For 64-bit this is recommended if the system is Intel Core i7
  941. (or later), AMD Opteron, or EM64T NUMA.
  942. For 32-bit this is only needed on (rare) 32-bit-only platforms
  943. that support NUMA topologies, such as NUMAQ / Summit, or if you
  944. boot a 32-bit kernel on a 64-bit NUMA platform.
  945. Otherwise, you should say N.
  946. comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
  947. depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
  948. config AMD_NUMA
  949. def_bool y
  950. prompt "Old style AMD Opteron NUMA detection"
  951. depends on X86_64 && NUMA && PCI
  952. ---help---
  953. Enable AMD NUMA node topology detection. You should say Y here if
  954. you have a multi processor AMD system. This uses an old method to
  955. read the NUMA configuration directly from the builtin Northbridge
  956. of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
  957. which also takes priority if both are compiled in.
  958. config X86_64_ACPI_NUMA
  959. def_bool y
  960. prompt "ACPI NUMA detection"
  961. depends on X86_64 && NUMA && ACPI && PCI
  962. select ACPI_NUMA
  963. ---help---
  964. Enable ACPI SRAT based node topology detection.
  965. # Some NUMA nodes have memory ranges that span
  966. # other nodes. Even though a pfn is valid and
  967. # between a node's start and end pfns, it may not
  968. # reside on that node. See memmap_init_zone()
  969. # for details.
  970. config NODES_SPAN_OTHER_NODES
  971. def_bool y
  972. depends on X86_64_ACPI_NUMA
  973. config NUMA_EMU
  974. bool "NUMA emulation"
  975. depends on NUMA
  976. ---help---
  977. Enable NUMA emulation. A flat machine will be split
  978. into virtual nodes when booted with "numa=fake=N", where N is the
  979. number of nodes. This is only useful for debugging.
  980. config NODES_SHIFT
  981. int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
  982. range 1 10
  983. default "10" if MAXSMP
  984. default "6" if X86_64
  985. default "4" if X86_NUMAQ
  986. default "3"
  987. depends on NEED_MULTIPLE_NODES
  988. ---help---
  989. Specify the maximum number of NUMA Nodes available on the target
  990. system. Increases memory reserved to accommodate various tables.
  991. config HAVE_ARCH_BOOTMEM
  992. def_bool y
  993. depends on X86_32 && NUMA
  994. config HAVE_ARCH_ALLOC_REMAP
  995. def_bool y
  996. depends on X86_32 && NUMA
  997. config ARCH_HAVE_MEMORY_PRESENT
  998. def_bool y
  999. depends on X86_32 && DISCONTIGMEM
  1000. config NEED_NODE_MEMMAP_SIZE
  1001. def_bool y
  1002. depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
  1003. config ARCH_FLATMEM_ENABLE
  1004. def_bool y
  1005. depends on X86_32 && !NUMA
  1006. config ARCH_DISCONTIGMEM_ENABLE
  1007. def_bool y
  1008. depends on NUMA && X86_32
  1009. config ARCH_DISCONTIGMEM_DEFAULT
  1010. def_bool y
  1011. depends on NUMA && X86_32
  1012. config ARCH_SPARSEMEM_ENABLE
  1013. def_bool y
  1014. depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
  1015. select SPARSEMEM_STATIC if X86_32
  1016. select SPARSEMEM_VMEMMAP_ENABLE if X86_64
  1017. config ARCH_SPARSEMEM_DEFAULT
  1018. def_bool y
  1019. depends on X86_64
  1020. config ARCH_SELECT_MEMORY_MODEL
  1021. def_bool y
  1022. depends on ARCH_SPARSEMEM_ENABLE
  1023. config ARCH_MEMORY_PROBE
  1024. def_bool X86_64
  1025. depends on MEMORY_HOTPLUG
  1026. config ARCH_PROC_KCORE_TEXT
  1027. def_bool y
  1028. depends on X86_64 && PROC_KCORE
  1029. config ILLEGAL_POINTER_VALUE
  1030. hex
  1031. default 0 if X86_32
  1032. default 0xdead000000000000 if X86_64
  1033. source "mm/Kconfig"
  1034. config HIGHPTE
  1035. bool "Allocate 3rd-level pagetables from highmem"
  1036. depends on HIGHMEM
  1037. ---help---
  1038. The VM uses one page table entry for each page of physical memory.
  1039. For systems with a lot of RAM, this can be wasteful of precious
  1040. low memory. Setting this option will put user-space page table
  1041. entries in high memory.
  1042. config X86_CHECK_BIOS_CORRUPTION
  1043. bool "Check for low memory corruption"
  1044. ---help---
  1045. Periodically check for memory corruption in low memory, which
  1046. is suspected to be caused by BIOS. Even when enabled in the
  1047. configuration, it is disabled at runtime. Enable it by
  1048. setting "memory_corruption_check=1" on the kernel command
  1049. line. By default it scans the low 64k of memory every 60
  1050. seconds; see the memory_corruption_check_size and
  1051. memory_corruption_check_period parameters in
  1052. Documentation/kernel-parameters.txt to adjust this.
  1053. When enabled with the default parameters, this option has
  1054. almost no overhead, as it reserves a relatively small amount
  1055. of memory and scans it infrequently. It both detects corruption
  1056. and prevents it from affecting the running system.
  1057. It is, however, intended as a diagnostic tool; if repeatable
  1058. BIOS-originated corruption always affects the same memory,
  1059. you can use memmap= to prevent the kernel from using that
  1060. memory.
  1061. config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
  1062. bool "Set the default setting of memory_corruption_check"
  1063. depends on X86_CHECK_BIOS_CORRUPTION
  1064. default y
  1065. ---help---
  1066. Set whether the default state of memory_corruption_check is
  1067. on or off.
  1068. config X86_RESERVE_LOW
  1069. int "Amount of low memory, in kilobytes, to reserve for the BIOS"
  1070. default 64
  1071. range 4 640
  1072. ---help---
  1073. Specify the amount of low memory to reserve for the BIOS.
  1074. The first page contains BIOS data structures that the kernel
  1075. must not use, so that page must always be reserved.
  1076. By default we reserve the first 64K of physical RAM, as a
  1077. number of BIOSes are known to corrupt that memory range
  1078. during events such as suspend/resume or monitor cable
  1079. insertion, so it must not be used by the kernel.
  1080. You can set this to 4 if you are absolutely sure that you
  1081. trust the BIOS to get all its memory reservations and usages
  1082. right. If you know your BIOS have problems beyond the
  1083. default 64K area, you can set this to 640 to avoid using the
  1084. entire low memory range.
  1085. If you have doubts about the BIOS (e.g. suspend/resume does
  1086. not work or there's kernel crashes after certain hardware
  1087. hotplug events) then you might want to enable
  1088. X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
  1089. typical corruption patterns.
  1090. Leave this to the default value of 64 if you are unsure.
  1091. config MATH_EMULATION
  1092. bool
  1093. prompt "Math emulation" if X86_32
  1094. ---help---
  1095. Linux can emulate a math coprocessor (used for floating point
  1096. operations) if you don't have one. 486DX and Pentium processors have
  1097. a math coprocessor built in, 486SX and 386 do not, unless you added
  1098. a 487DX or 387, respectively. (The messages during boot time can
  1099. give you some hints here ["man dmesg"].) Everyone needs either a
  1100. coprocessor or this emulation.
  1101. If you don't have a math coprocessor, you need to say Y here; if you
  1102. say Y here even though you have a coprocessor, the coprocessor will
  1103. be used nevertheless. (This behavior can be changed with the kernel
  1104. command line option "no387", which comes handy if your coprocessor
  1105. is broken. Try "man bootparam" or see the documentation of your boot
  1106. loader (lilo or loadlin) about how to pass options to the kernel at
  1107. boot time.) This means that it is a good idea to say Y here if you
  1108. intend to use this kernel on different machines.
  1109. More information about the internals of the Linux math coprocessor
  1110. emulation can be found in <file:arch/x86/math-emu/README>.
  1111. If you are not sure, say Y; apart from resulting in a 66 KB bigger
  1112. kernel, it won't hurt.
  1113. config MTRR
  1114. def_bool y
  1115. prompt "MTRR (Memory Type Range Register) support" if EXPERT
  1116. ---help---
  1117. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  1118. the Memory Type Range Registers (MTRRs) may be used to control
  1119. processor access to memory ranges. This is most useful if you have
  1120. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  1121. allows bus write transfers to be combined into a larger transfer
  1122. before bursting over the PCI/AGP bus. This can increase performance
  1123. of image write operations 2.5 times or more. Saying Y here creates a
  1124. /proc/mtrr file which may be used to manipulate your processor's
  1125. MTRRs. Typically the X server should use this.
  1126. This code has a reasonably generic interface so that similar
  1127. control registers on other processors can be easily supported
  1128. as well:
  1129. The Cyrix 6x86, 6x86MX and M II processors have Address Range
  1130. Registers (ARRs) which provide a similar functionality to MTRRs. For
  1131. these, the ARRs are used to emulate the MTRRs.
  1132. The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
  1133. MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
  1134. write-combining. All of these processors are supported by this code
  1135. and it makes sense to say Y here if you have one of them.
  1136. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  1137. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  1138. can lead to all sorts of problems, so it's good to say Y here.
  1139. You can safely say Y even if your machine doesn't have MTRRs, you'll
  1140. just add about 9 KB to your kernel.
  1141. See <file:Documentation/x86/mtrr.txt> for more information.
  1142. config MTRR_SANITIZER
  1143. def_bool y
  1144. prompt "MTRR cleanup support"
  1145. depends on MTRR
  1146. ---help---
  1147. Convert MTRR layout from continuous to discrete, so X drivers can
  1148. add writeback entries.
  1149. Can be disabled with disable_mtrr_cleanup on the kernel command line.
  1150. The largest mtrr entry size for a continuous block can be set with
  1151. mtrr_chunk_size.
  1152. If unsure, say Y.
  1153. config MTRR_SANITIZER_ENABLE_DEFAULT
  1154. int "MTRR cleanup enable value (0-1)"
  1155. range 0 1
  1156. default "0"
  1157. depends on MTRR_SANITIZER
  1158. ---help---
  1159. Enable mtrr cleanup default value
  1160. config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
  1161. int "MTRR cleanup spare reg num (0-7)"
  1162. range 0 7
  1163. default "1"
  1164. depends on MTRR_SANITIZER
  1165. ---help---
  1166. mtrr cleanup spare entries default, it can be changed via
  1167. mtrr_spare_reg_nr=N on the kernel command line.
  1168. config X86_PAT
  1169. def_bool y
  1170. prompt "x86 PAT support" if EXPERT
  1171. depends on MTRR
  1172. ---help---
  1173. Use PAT attributes to setup page level cache control.
  1174. PATs are the modern equivalents of MTRRs and are much more
  1175. flexible than MTRRs.
  1176. Say N here if you see bootup problems (boot crash, boot hang,
  1177. spontaneous reboots) or a non-working video driver.
  1178. If unsure, say Y.
  1179. config ARCH_USES_PG_UNCACHED
  1180. def_bool y
  1181. depends on X86_PAT
  1182. config EFI
  1183. bool "EFI runtime service support"
  1184. depends on ACPI
  1185. ---help---
  1186. This enables the kernel to use EFI runtime services that are
  1187. available (such as the EFI variable services).
  1188. This option is only useful on systems that have EFI firmware.
  1189. In addition, you should use the latest ELILO loader available
  1190. at <http://elilo.sourceforge.net> in order to take advantage
  1191. of EFI runtime services. However, even with this option, the
  1192. resultant kernel should continue to boot on existing non-EFI
  1193. platforms.
  1194. config SECCOMP
  1195. def_bool y
  1196. prompt "Enable seccomp to safely compute untrusted bytecode"
  1197. ---help---
  1198. This kernel feature is useful for number crunching applications
  1199. that may need to compute untrusted bytecode during their
  1200. execution. By using pipes or other transports made available to
  1201. the process as file descriptors supporting the read/write
  1202. syscalls, it's possible to isolate those applications in
  1203. their own address space using seccomp. Once seccomp is
  1204. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1205. and the task is only allowed to execute a few safe syscalls
  1206. defined by each seccomp mode.
  1207. If unsure, say Y. Only embedded should say N here.
  1208. config CC_STACKPROTECTOR
  1209. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1210. ---help---
  1211. This option turns on the -fstack-protector GCC feature. This
  1212. feature puts, at the beginning of functions, a canary value on
  1213. the stack just before the return address, and validates
  1214. the value just before actually returning. Stack based buffer
  1215. overflows (that need to overwrite this return address) now also
  1216. overwrite the canary, which gets detected and the attack is then
  1217. neutralized via a kernel panic.
  1218. This feature requires gcc version 4.2 or above, or a distribution
  1219. gcc with the feature backported. Older versions are automatically
  1220. detected and for those versions, this configuration option is
  1221. ignored. (and a warning is printed during bootup)
  1222. source kernel/Kconfig.hz
  1223. config KEXEC
  1224. bool "kexec system call"
  1225. ---help---
  1226. kexec is a system call that implements the ability to shutdown your
  1227. current kernel, and to start another kernel. It is like a reboot
  1228. but it is independent of the system firmware. And like a reboot
  1229. you can start any kernel with it, not just Linux.
  1230. The name comes from the similarity to the exec system call.
  1231. It is an ongoing process to be certain the hardware in a machine
  1232. is properly shutdown, so do not be surprised if this code does not
  1233. initially work for you. It may help to enable device hotplugging
  1234. support. As of this writing the exact hardware interface is
  1235. strongly in flux, so no good recommendation can be made.
  1236. config CRASH_DUMP
  1237. bool "kernel crash dumps"
  1238. depends on X86_64 || (X86_32 && HIGHMEM)
  1239. ---help---
  1240. Generate crash dump after being started by kexec.
  1241. This should be normally only set in special crash dump kernels
  1242. which are loaded in the main kernel with kexec-tools into
  1243. a specially reserved region and then later executed after
  1244. a crash by kdump/kexec. The crash dump kernel must be compiled
  1245. to a memory address not used by the main kernel or BIOS using
  1246. PHYSICAL_START, or it must be built as a relocatable image
  1247. (CONFIG_RELOCATABLE=y).
  1248. For more details see Documentation/kdump/kdump.txt
  1249. config KEXEC_JUMP
  1250. bool "kexec jump (EXPERIMENTAL)"
  1251. depends on EXPERIMENTAL
  1252. depends on KEXEC && HIBERNATION
  1253. ---help---
  1254. Jump between original kernel and kexeced kernel and invoke
  1255. code in physical address mode via KEXEC
  1256. config PHYSICAL_START
  1257. hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
  1258. default "0x1000000"
  1259. ---help---
  1260. This gives the physical address where the kernel is loaded.
  1261. If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
  1262. bzImage will decompress itself to above physical address and
  1263. run from there. Otherwise, bzImage will run from the address where
  1264. it has been loaded by the boot loader and will ignore above physical
  1265. address.
  1266. In normal kdump cases one does not have to set/change this option
  1267. as now bzImage can be compiled as a completely relocatable image
  1268. (CONFIG_RELOCATABLE=y) and be used to load and run from a different
  1269. address. This option is mainly useful for the folks who don't want
  1270. to use a bzImage for capturing the crash dump and want to use a
  1271. vmlinux instead. vmlinux is not relocatable hence a kernel needs
  1272. to be specifically compiled to run from a specific memory area
  1273. (normally a reserved region) and this option comes handy.
  1274. So if you are using bzImage for capturing the crash dump,
  1275. leave the value here unchanged to 0x1000000 and set
  1276. CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
  1277. for capturing the crash dump change this value to start of
  1278. the reserved region. In other words, it can be set based on
  1279. the "X" value as specified in the "crashkernel=YM@XM"
  1280. command line boot parameter passed to the panic-ed
  1281. kernel. Please take a look at Documentation/kdump/kdump.txt
  1282. for more details about crash dumps.
  1283. Usage of bzImage for capturing the crash dump is recommended as
  1284. one does not have to build two kernels. Same kernel can be used
  1285. as production kernel and capture kernel. Above option should have
  1286. gone away after relocatable bzImage support is introduced. But it
  1287. is present because there are users out there who continue to use
  1288. vmlinux for dump capture. This option should go away down the
  1289. line.
  1290. Don't change this unless you know what you are doing.
  1291. config RELOCATABLE
  1292. bool "Build a relocatable kernel"
  1293. default y
  1294. ---help---
  1295. This builds a kernel image that retains relocation information
  1296. so it can be loaded someplace besides the default 1MB.
  1297. The relocations tend to make the kernel binary about 10% larger,
  1298. but are discarded at runtime.
  1299. One use is for the kexec on panic case where the recovery kernel
  1300. must live at a different physical address than the primary
  1301. kernel.
  1302. Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
  1303. it has been loaded at and the compile time physical address
  1304. (CONFIG_PHYSICAL_START) is ignored.
  1305. # Relocation on x86-32 needs some additional build support
  1306. config X86_NEED_RELOCS
  1307. def_bool y
  1308. depends on X86_32 && RELOCATABLE
  1309. config PHYSICAL_ALIGN
  1310. hex "Alignment value to which kernel should be aligned" if X86_32
  1311. default "0x1000000"
  1312. range 0x2000 0x1000000
  1313. ---help---
  1314. This value puts the alignment restrictions on physical address
  1315. where kernel is loaded and run from. Kernel is compiled for an
  1316. address which meets above alignment restriction.
  1317. If bootloader loads the kernel at a non-aligned address and
  1318. CONFIG_RELOCATABLE is set, kernel will move itself to nearest
  1319. address aligned to above value and run from there.
  1320. If bootloader loads the kernel at a non-aligned address and
  1321. CONFIG_RELOCATABLE is not set, kernel will ignore the run time
  1322. load address and decompress itself to the address it has been
  1323. compiled for and run from there. The address for which kernel is
  1324. compiled already meets above alignment restrictions. Hence the
  1325. end result is that kernel runs from a physical address meeting
  1326. above alignment restrictions.
  1327. Don't change this unless you know what you are doing.
  1328. config HOTPLUG_CPU
  1329. bool "Support for hot-pluggable CPUs"
  1330. depends on SMP && HOTPLUG
  1331. ---help---
  1332. Say Y here to allow turning CPUs off and on. CPUs can be
  1333. controlled through /sys/devices/system/cpu.
  1334. ( Note: power management support will enable this option
  1335. automatically on SMP systems. )
  1336. Say N if you want to disable CPU hotplug.
  1337. config COMPAT_VDSO
  1338. def_bool y
  1339. prompt "Compat VDSO support"
  1340. depends on X86_32 || IA32_EMULATION
  1341. ---help---
  1342. Map the 32-bit VDSO to the predictable old-style address too.
  1343. Say N here if you are running a sufficiently recent glibc
  1344. version (2.3.3 or later), to remove the high-mapped
  1345. VDSO mapping and to exclusively use the randomized VDSO.
  1346. If unsure, say Y.
  1347. config CMDLINE_BOOL
  1348. bool "Built-in kernel command line"
  1349. ---help---
  1350. Allow for specifying boot arguments to the kernel at
  1351. build time. On some systems (e.g. embedded ones), it is
  1352. necessary or convenient to provide some or all of the
  1353. kernel boot arguments with the kernel itself (that is,
  1354. to not rely on the boot loader to provide them.)
  1355. To compile command line arguments into the kernel,
  1356. set this option to 'Y', then fill in the
  1357. the boot arguments in CONFIG_CMDLINE.
  1358. Systems with fully functional boot loaders (i.e. non-embedded)
  1359. should leave this option set to 'N'.
  1360. config CMDLINE
  1361. string "Built-in kernel command string"
  1362. depends on CMDLINE_BOOL
  1363. default ""
  1364. ---help---
  1365. Enter arguments here that should be compiled into the kernel
  1366. image and used at boot time. If the boot loader provides a
  1367. command line at boot time, it is appended to this string to
  1368. form the full kernel command line, when the system boots.
  1369. However, you can use the CONFIG_CMDLINE_OVERRIDE option to
  1370. change this behavior.
  1371. In most cases, the command line (whether built-in or provided
  1372. by the boot loader) should specify the device for the root
  1373. file system.
  1374. config CMDLINE_OVERRIDE
  1375. bool "Built-in command line overrides boot loader arguments"
  1376. depends on CMDLINE_BOOL
  1377. ---help---
  1378. Set this option to 'Y' to have the kernel ignore the boot loader
  1379. command line, and use ONLY the built-in command line.
  1380. This is used to work around broken boot loaders. This should
  1381. be set to 'N' under normal conditions.
  1382. endmenu
  1383. config ARCH_ENABLE_MEMORY_HOTPLUG
  1384. def_bool y
  1385. depends on X86_64 || (X86_32 && HIGHMEM)
  1386. config ARCH_ENABLE_MEMORY_HOTREMOVE
  1387. def_bool y
  1388. depends on MEMORY_HOTPLUG
  1389. config USE_PERCPU_NUMA_NODE_ID
  1390. def_bool y
  1391. depends on NUMA
  1392. menu "Power management and ACPI options"
  1393. config ARCH_HIBERNATION_HEADER
  1394. def_bool y
  1395. depends on X86_64 && HIBERNATION
  1396. source "kernel/power/Kconfig"
  1397. source "drivers/acpi/Kconfig"
  1398. source "drivers/sfi/Kconfig"
  1399. config X86_APM_BOOT
  1400. def_bool y
  1401. depends on APM || APM_MODULE
  1402. menuconfig APM
  1403. tristate "APM (Advanced Power Management) BIOS support"
  1404. depends on X86_32 && PM_SLEEP
  1405. ---help---
  1406. APM is a BIOS specification for saving power using several different
  1407. techniques. This is mostly useful for battery powered laptops with
  1408. APM compliant BIOSes. If you say Y here, the system time will be
  1409. reset after a RESUME operation, the /proc/apm device will provide
  1410. battery status information, and user-space programs will receive
  1411. notification of APM "events" (e.g. battery status change).
  1412. If you select "Y" here, you can disable actual use of the APM
  1413. BIOS by passing the "apm=off" option to the kernel at boot time.
  1414. Note that the APM support is almost completely disabled for
  1415. machines with more than one CPU.
  1416. In order to use APM, you will need supporting software. For location
  1417. and more information, read <file:Documentation/power/pm.txt> and the
  1418. Battery Powered Linux mini-HOWTO, available from
  1419. <http://www.tldp.org/docs.html#howto>.
  1420. This driver does not spin down disk drives (see the hdparm(8)
  1421. manpage ("man 8 hdparm") for that), and it doesn't turn off
  1422. VESA-compliant "green" monitors.
  1423. This driver does not support the TI 4000M TravelMate and the ACER
  1424. 486/DX4/75 because they don't have compliant BIOSes. Many "green"
  1425. desktop machines also don't have compliant BIOSes, and this driver
  1426. may cause those machines to panic during the boot phase.
  1427. Generally, if you don't have a battery in your machine, there isn't
  1428. much point in using this driver and you should say N. If you get
  1429. random kernel OOPSes or reboots that don't seem to be related to
  1430. anything, try disabling/enabling this option (or disabling/enabling
  1431. APM in your BIOS).
  1432. Some other things you should try when experiencing seemingly random,
  1433. "weird" problems:
  1434. 1) make sure that you have enough swap space and that it is
  1435. enabled.
  1436. 2) pass the "no-hlt" option to the kernel
  1437. 3) switch on floating point emulation in the kernel and pass
  1438. the "no387" option to the kernel
  1439. 4) pass the "floppy=nodma" option to the kernel
  1440. 5) pass the "mem=4M" option to the kernel (thereby disabling
  1441. all but the first 4 MB of RAM)
  1442. 6) make sure that the CPU is not over clocked.
  1443. 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
  1444. 8) disable the cache from your BIOS settings
  1445. 9) install a fan for the video card or exchange video RAM
  1446. 10) install a better fan for the CPU
  1447. 11) exchange RAM chips
  1448. 12) exchange the motherboard.
  1449. To compile this driver as a module, choose M here: the
  1450. module will be called apm.
  1451. if APM
  1452. config APM_IGNORE_USER_SUSPEND
  1453. bool "Ignore USER SUSPEND"
  1454. ---help---
  1455. This option will ignore USER SUSPEND requests. On machines with a
  1456. compliant APM BIOS, you want to say N. However, on the NEC Versa M
  1457. series notebooks, it is necessary to say Y because of a BIOS bug.
  1458. config APM_DO_ENABLE
  1459. bool "Enable PM at boot time"
  1460. ---help---
  1461. Enable APM features at boot time. From page 36 of the APM BIOS
  1462. specification: "When disabled, the APM BIOS does not automatically
  1463. power manage devices, enter the Standby State, enter the Suspend
  1464. State, or take power saving steps in response to CPU Idle calls."
  1465. This driver will make CPU Idle calls when Linux is idle (unless this
  1466. feature is turned off -- see "Do CPU IDLE calls", below). This
  1467. should always save battery power, but more complicated APM features
  1468. will be dependent on your BIOS implementation. You may need to turn
  1469. this option off if your computer hangs at boot time when using APM
  1470. support, or if it beeps continuously instead of suspending. Turn
  1471. this off if you have a NEC UltraLite Versa 33/C or a Toshiba
  1472. T400CDT. This is off by default since most machines do fine without
  1473. this feature.
  1474. config APM_CPU_IDLE
  1475. bool "Make CPU Idle calls when idle"
  1476. ---help---
  1477. Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
  1478. On some machines, this can activate improved power savings, such as
  1479. a slowed CPU clock rate, when the machine is idle. These idle calls
  1480. are made after the idle loop has run for some length of time (e.g.,
  1481. 333 mS). On some machines, this will cause a hang at boot time or
  1482. whenever the CPU becomes idle. (On machines with more than one CPU,
  1483. this option does nothing.)
  1484. config APM_DISPLAY_BLANK
  1485. bool "Enable console blanking using APM"
  1486. ---help---
  1487. Enable console blanking using the APM. Some laptops can use this to
  1488. turn off the LCD backlight when the screen blanker of the Linux
  1489. virtual console blanks the screen. Note that this is only used by
  1490. the virtual console screen blanker, and won't turn off the backlight
  1491. when using the X Window system. This also doesn't have anything to
  1492. do with your VESA-compliant power-saving monitor. Further, this
  1493. option doesn't work for all laptops -- it might not turn off your
  1494. backlight at all, or it might print a lot of errors to the console,
  1495. especially if you are using gpm.
  1496. config APM_ALLOW_INTS
  1497. bool "Allow interrupts during APM BIOS calls"
  1498. ---help---
  1499. Normally we disable external interrupts while we are making calls to
  1500. the APM BIOS as a measure to lessen the effects of a badly behaving
  1501. BIOS implementation. The BIOS should reenable interrupts if it
  1502. needs to. Unfortunately, some BIOSes do not -- especially those in
  1503. many of the newer IBM Thinkpads. If you experience hangs when you
  1504. suspend, try setting this to Y. Otherwise, say N.
  1505. endif # APM
  1506. source "drivers/cpufreq/Kconfig"
  1507. source "drivers/cpuidle/Kconfig"
  1508. source "drivers/idle/Kconfig"
  1509. endmenu
  1510. menu "Bus options (PCI etc.)"
  1511. config PCI
  1512. bool "PCI support"
  1513. default y
  1514. select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
  1515. ---help---
  1516. Find out whether you have a PCI motherboard. PCI is the name of a
  1517. bus system, i.e. the way the CPU talks to the other stuff inside
  1518. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1519. VESA. If you have PCI, say Y, otherwise N.
  1520. choice
  1521. prompt "PCI access mode"
  1522. depends on X86_32 && PCI
  1523. default PCI_GOANY
  1524. ---help---
  1525. On PCI systems, the BIOS can be used to detect the PCI devices and
  1526. determine their configuration. However, some old PCI motherboards
  1527. have BIOS bugs and may crash if this is done. Also, some embedded
  1528. PCI-based systems don't have any BIOS at all. Linux can also try to
  1529. detect the PCI hardware directly without using the BIOS.
  1530. With this option, you can specify how Linux should detect the
  1531. PCI devices. If you choose "BIOS", the BIOS will be used,
  1532. if you choose "Direct", the BIOS won't be used, and if you
  1533. choose "MMConfig", then PCI Express MMCONFIG will be used.
  1534. If you choose "Any", the kernel will try MMCONFIG, then the
  1535. direct access method and falls back to the BIOS if that doesn't
  1536. work. If unsure, go with the default, which is "Any".
  1537. config PCI_GOBIOS
  1538. bool "BIOS"
  1539. config PCI_GOMMCONFIG
  1540. bool "MMConfig"
  1541. config PCI_GODIRECT
  1542. bool "Direct"
  1543. config PCI_GOOLPC
  1544. bool "OLPC XO-1"
  1545. depends on OLPC
  1546. config PCI_GOANY
  1547. bool "Any"
  1548. endchoice
  1549. config PCI_BIOS
  1550. def_bool y
  1551. depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
  1552. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  1553. config PCI_DIRECT
  1554. def_bool y
  1555. depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
  1556. config PCI_MMCONFIG
  1557. def_bool y
  1558. depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
  1559. config PCI_OLPC
  1560. def_bool y
  1561. depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
  1562. config PCI_XEN
  1563. def_bool y
  1564. depends on PCI && XEN
  1565. select SWIOTLB_XEN
  1566. config PCI_DOMAINS
  1567. def_bool y
  1568. depends on PCI
  1569. config PCI_MMCONFIG
  1570. bool "Support mmconfig PCI config space access"
  1571. depends on X86_64 && PCI && ACPI
  1572. config PCI_CNB20LE_QUIRK
  1573. bool "Read CNB20LE Host Bridge Windows" if EXPERT
  1574. default n
  1575. depends on PCI && EXPERIMENTAL
  1576. help
  1577. Read the PCI windows out of the CNB20LE host bridge. This allows
  1578. PCI hotplug to work on systems with the CNB20LE chipset which do
  1579. not have ACPI.
  1580. There's no public spec for this chipset, and this functionality
  1581. is known to be incomplete.
  1582. You should say N unless you know you need this.
  1583. source "drivers/pci/pcie/Kconfig"
  1584. source "drivers/pci/Kconfig"
  1585. # x86_64 have no ISA slots, but can have ISA-style DMA.
  1586. config ISA_DMA_API
  1587. bool "ISA-style DMA support" if (X86_64 && EXPERT)
  1588. default y
  1589. help
  1590. Enables ISA-style DMA support for devices requiring such controllers.
  1591. If unsure, say Y.
  1592. if X86_32
  1593. config ISA
  1594. bool "ISA support"
  1595. ---help---
  1596. Find out whether you have ISA slots on your motherboard. ISA is the
  1597. name of a bus system, i.e. the way the CPU talks to the other stuff
  1598. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1599. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1600. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1601. config EISA
  1602. bool "EISA support"
  1603. depends on ISA
  1604. ---help---
  1605. The Extended Industry Standard Architecture (EISA) bus was
  1606. developed as an open alternative to the IBM MicroChannel bus.
  1607. The EISA bus provided some of the features of the IBM MicroChannel
  1608. bus while maintaining backward compatibility with cards made for
  1609. the older ISA bus. The EISA bus saw limited use between 1988 and
  1610. 1995 when it was made obsolete by the PCI bus.
  1611. Say Y here if you are building a kernel for an EISA-based machine.
  1612. Otherwise, say N.
  1613. source "drivers/eisa/Kconfig"
  1614. config MCA
  1615. bool "MCA support"
  1616. ---help---
  1617. MicroChannel Architecture is found in some IBM PS/2 machines and
  1618. laptops. It is a bus system similar to PCI or ISA. See
  1619. <file:Documentation/mca.txt> (and especially the web page given
  1620. there) before attempting to build an MCA bus kernel.
  1621. source "drivers/mca/Kconfig"
  1622. config SCx200
  1623. tristate "NatSemi SCx200 support"
  1624. ---help---
  1625. This provides basic support for National Semiconductor's
  1626. (now AMD's) Geode processors. The driver probes for the
  1627. PCI-IDs of several on-chip devices, so its a good dependency
  1628. for other scx200_* drivers.
  1629. If compiled as a module, the driver is named scx200.
  1630. config SCx200HR_TIMER
  1631. tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
  1632. depends on SCx200
  1633. default y
  1634. ---help---
  1635. This driver provides a clocksource built upon the on-chip
  1636. 27MHz high-resolution timer. Its also a workaround for
  1637. NSC Geode SC-1100's buggy TSC, which loses time when the
  1638. processor goes idle (as is done by the scheduler). The
  1639. other workaround is idle=poll boot option.
  1640. config OLPC
  1641. bool "One Laptop Per Child support"
  1642. depends on !X86_PAE
  1643. select GPIOLIB
  1644. select OF
  1645. select OF_PROMTREE
  1646. ---help---
  1647. Add support for detecting the unique features of the OLPC
  1648. XO hardware.
  1649. config OLPC_XO1
  1650. tristate "OLPC XO-1 support"
  1651. depends on OLPC && MFD_CS5535
  1652. ---help---
  1653. Add support for non-essential features of the OLPC XO-1 laptop.
  1654. endif # X86_32
  1655. config AMD_NB
  1656. def_bool y
  1657. depends on CPU_SUP_AMD && PCI
  1658. source "drivers/pcmcia/Kconfig"
  1659. source "drivers/pci/hotplug/Kconfig"
  1660. config RAPIDIO
  1661. bool "RapidIO support"
  1662. depends on PCI
  1663. default n
  1664. help
  1665. If you say Y here, the kernel will include drivers and
  1666. infrastructure code to support RapidIO interconnect devices.
  1667. source "drivers/rapidio/Kconfig"
  1668. endmenu
  1669. menu "Executable file formats / Emulations"
  1670. source "fs/Kconfig.binfmt"
  1671. config IA32_EMULATION
  1672. bool "IA32 Emulation"
  1673. depends on X86_64
  1674. select COMPAT_BINFMT_ELF
  1675. ---help---
  1676. Include code to run 32-bit programs under a 64-bit kernel. You should
  1677. likely turn this on, unless you're 100% sure that you don't have any
  1678. 32-bit programs left.
  1679. config IA32_AOUT
  1680. tristate "IA32 a.out support"
  1681. depends on IA32_EMULATION
  1682. ---help---
  1683. Support old a.out binaries in the 32bit emulation.
  1684. config COMPAT
  1685. def_bool y
  1686. depends on IA32_EMULATION
  1687. config COMPAT_FOR_U64_ALIGNMENT
  1688. def_bool COMPAT
  1689. depends on X86_64
  1690. config SYSVIPC_COMPAT
  1691. def_bool y
  1692. depends on COMPAT && SYSVIPC
  1693. config KEYS_COMPAT
  1694. bool
  1695. depends on COMPAT && KEYS
  1696. default y
  1697. endmenu
  1698. config HAVE_ATOMIC_IOMAP
  1699. def_bool y
  1700. depends on X86_32
  1701. config HAVE_TEXT_POKE_SMP
  1702. bool
  1703. select STOP_MACHINE if SMP
  1704. source "net/Kconfig"
  1705. source "drivers/Kconfig"
  1706. source "drivers/firmware/Kconfig"
  1707. source "fs/Kconfig"
  1708. source "arch/x86/Kconfig.debug"
  1709. source "security/Kconfig"
  1710. source "crypto/Kconfig"
  1711. source "arch/x86/kvm/Kconfig"
  1712. source "lib/Kconfig"