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 ARCH_CLOCKSOURCE_DATA
  89. def_bool y
  90. depends on X86_64
  91. config GENERIC_CLOCKEVENTS_BROADCAST
  92. def_bool y
  93. depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
  94. config LOCKDEP_SUPPORT
  95. def_bool y
  96. config STACKTRACE_SUPPORT
  97. def_bool y
  98. config HAVE_LATENCYTOP_SUPPORT
  99. def_bool y
  100. config MMU
  101. def_bool y
  102. config ZONE_DMA
  103. bool "DMA memory allocation support" if EXPERT
  104. default y
  105. help
  106. DMA memory allocation support allows devices with less than 32-bit
  107. addressing to allocate within the first 16MB of address space.
  108. Disable if no such devices will be used.
  109. If unsure, say Y.
  110. config SBUS
  111. bool
  112. config NEED_DMA_MAP_STATE
  113. def_bool (X86_64 || DMAR || DMA_API_DEBUG)
  114. config NEED_SG_DMA_LENGTH
  115. def_bool y
  116. config GENERIC_ISA_DMA
  117. def_bool ISA_DMA_API
  118. config GENERIC_IOMAP
  119. def_bool y
  120. config GENERIC_BUG
  121. def_bool y
  122. depends on BUG
  123. select GENERIC_BUG_RELATIVE_POINTERS if X86_64
  124. config GENERIC_BUG_RELATIVE_POINTERS
  125. bool
  126. config GENERIC_HWEIGHT
  127. def_bool y
  128. config GENERIC_GPIO
  129. bool
  130. config ARCH_MAY_HAVE_PC_FDC
  131. def_bool ISA_DMA_API
  132. config RWSEM_GENERIC_SPINLOCK
  133. def_bool !X86_XADD
  134. config RWSEM_XCHGADD_ALGORITHM
  135. def_bool X86_XADD
  136. config ARCH_HAS_CPU_IDLE_WAIT
  137. def_bool y
  138. config GENERIC_CALIBRATE_DELAY
  139. def_bool y
  140. config GENERIC_TIME_VSYSCALL
  141. bool
  142. default X86_64
  143. config ARCH_HAS_CPU_RELAX
  144. def_bool y
  145. config ARCH_HAS_DEFAULT_IDLE
  146. def_bool y
  147. config ARCH_HAS_CACHE_LINE_SIZE
  148. def_bool y
  149. config HAVE_SETUP_PER_CPU_AREA
  150. def_bool y
  151. config NEED_PER_CPU_EMBED_FIRST_CHUNK
  152. def_bool y
  153. config NEED_PER_CPU_PAGE_FIRST_CHUNK
  154. def_bool y
  155. config HAVE_CPUMASK_OF_CPU_MAP
  156. def_bool X86_64_SMP
  157. config ARCH_HIBERNATION_POSSIBLE
  158. def_bool y
  159. config ARCH_SUSPEND_POSSIBLE
  160. def_bool y
  161. config ZONE_DMA32
  162. bool
  163. default X86_64
  164. config ARCH_POPULATES_NODE_MAP
  165. def_bool y
  166. config AUDIT_ARCH
  167. bool
  168. default X86_64
  169. config ARCH_SUPPORTS_OPTIMIZED_INLINING
  170. def_bool y
  171. config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  172. def_bool y
  173. config HAVE_INTEL_TXT
  174. def_bool y
  175. depends on EXPERIMENTAL && DMAR && ACPI
  176. config X86_32_SMP
  177. def_bool y
  178. depends on X86_32 && SMP
  179. config X86_64_SMP
  180. def_bool y
  181. depends on X86_64 && SMP
  182. config X86_HT
  183. def_bool y
  184. depends on SMP
  185. config X86_32_LAZY_GS
  186. def_bool y
  187. depends on X86_32 && !CC_STACKPROTECTOR
  188. config ARCH_HWEIGHT_CFLAGS
  189. string
  190. default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
  191. 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
  192. config KTIME_SCALAR
  193. def_bool X86_32
  194. config ARCH_CPU_PROBE_RELEASE
  195. def_bool y
  196. depends on HOTPLUG_CPU
  197. source "init/Kconfig"
  198. source "kernel/Kconfig.freezer"
  199. menu "Processor type and features"
  200. source "kernel/time/Kconfig"
  201. config SMP
  202. bool "Symmetric multi-processing support"
  203. ---help---
  204. This enables support for systems with more than one CPU. If you have
  205. a system with only one CPU, like most personal computers, say N. If
  206. you have a system with more than one CPU, say Y.
  207. If you say N here, the kernel will run on single and multiprocessor
  208. machines, but will use only one CPU of a multiprocessor machine. If
  209. you say Y here, the kernel will run on many, but not all,
  210. singleprocessor machines. On a singleprocessor machine, the kernel
  211. will run faster if you say N here.
  212. Note that if you say Y here and choose architecture "586" or
  213. "Pentium" under "Processor family", the kernel will not work on 486
  214. architectures. Similarly, multiprocessor kernels for the "PPro"
  215. architecture may not work on all Pentium based boards.
  216. People using multiprocessor machines who say Y here should also say
  217. Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
  218. Management" code will be disabled if you say Y here.
  219. See also <file:Documentation/i386/IO-APIC.txt>,
  220. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  221. <http://www.tldp.org/docs.html#howto>.
  222. If you don't know what to do here, say N.
  223. config X86_X2APIC
  224. bool "Support x2apic"
  225. depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
  226. ---help---
  227. This enables x2apic support on CPUs that have this feature.
  228. This allows 32-bit apic IDs (so it can support very large systems),
  229. and accesses the local apic via MSRs not via mmio.
  230. If you don't know what to do here, say N.
  231. config X86_MPPARSE
  232. bool "Enable MPS table" if ACPI
  233. default y
  234. depends on X86_LOCAL_APIC
  235. ---help---
  236. For old smp systems that do not have proper acpi support. Newer systems
  237. (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
  238. config X86_BIGSMP
  239. bool "Support for big SMP systems with more than 8 CPUs"
  240. depends on X86_32 && SMP
  241. ---help---
  242. This option is needed for the systems that have more than 8 CPUs
  243. if X86_32
  244. config X86_EXTENDED_PLATFORM
  245. bool "Support for extended (non-PC) x86 platforms"
  246. default y
  247. ---help---
  248. If you disable this option then the kernel will only support
  249. standard PC platforms. (which covers the vast majority of
  250. systems out there.)
  251. If you enable this option then you'll be able to select support
  252. for the following (non-PC) 32 bit x86 platforms:
  253. AMD Elan
  254. NUMAQ (IBM/Sequent)
  255. RDC R-321x SoC
  256. SGI 320/540 (Visual Workstation)
  257. Summit/EXA (IBM x440)
  258. Unisys ES7000 IA32 series
  259. Moorestown MID devices
  260. If you have one of these systems, or if you want to build a
  261. generic distribution kernel, say Y here - otherwise say N.
  262. endif
  263. if X86_64
  264. config X86_EXTENDED_PLATFORM
  265. bool "Support for extended (non-PC) x86 platforms"
  266. default y
  267. ---help---
  268. If you disable this option then the kernel will only support
  269. standard PC platforms. (which covers the vast majority of
  270. systems out there.)
  271. If you enable this option then you'll be able to select support
  272. for the following (non-PC) 64 bit x86 platforms:
  273. ScaleMP vSMP
  274. SGI Ultraviolet
  275. If you have one of these systems, or if you want to build a
  276. generic distribution kernel, say Y here - otherwise say N.
  277. endif
  278. # This is an alphabetically sorted list of 64 bit extended platforms
  279. # Please maintain the alphabetic order if and when there are additions
  280. config X86_VSMP
  281. bool "ScaleMP vSMP"
  282. select PARAVIRT_GUEST
  283. select PARAVIRT
  284. depends on X86_64 && PCI
  285. depends on X86_EXTENDED_PLATFORM
  286. ---help---
  287. Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
  288. supposed to run on these EM64T-based machines. Only choose this option
  289. if you have one of these machines.
  290. config X86_UV
  291. bool "SGI Ultraviolet"
  292. depends on X86_64
  293. depends on X86_EXTENDED_PLATFORM
  294. depends on NUMA
  295. depends on X86_X2APIC
  296. ---help---
  297. This option is needed in order to support SGI Ultraviolet systems.
  298. If you don't have one of these, you should say N here.
  299. # Following is an alphabetically sorted list of 32 bit extended platforms
  300. # Please maintain the alphabetic order if and when there are additions
  301. config X86_INTEL_CE
  302. bool "CE4100 TV platform"
  303. depends on PCI
  304. depends on PCI_GODIRECT
  305. depends on X86_32
  306. depends on X86_EXTENDED_PLATFORM
  307. select X86_REBOOTFIXUPS
  308. select OF
  309. select OF_EARLY_FLATTREE
  310. ---help---
  311. Select for the Intel CE media processor (CE4100) SOC.
  312. This option compiles in support for the CE4100 SOC for settop
  313. boxes and media devices.
  314. config X86_MRST
  315. bool "Moorestown MID platform"
  316. depends on PCI
  317. depends on PCI_GOANY
  318. depends on X86_32
  319. depends on X86_EXTENDED_PLATFORM
  320. depends on X86_IO_APIC
  321. select APB_TIMER
  322. select I2C
  323. select SPI
  324. select INTEL_SCU_IPC
  325. select X86_PLATFORM_DEVICES
  326. ---help---
  327. Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
  328. Internet Device(MID) platform. Moorestown consists of two chips:
  329. Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
  330. Unlike standard x86 PCs, Moorestown does not have many legacy devices
  331. nor standard legacy replacement devices/features. e.g. Moorestown does
  332. not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
  333. config X86_RDC321X
  334. bool "RDC R-321x SoC"
  335. depends on X86_32
  336. depends on X86_EXTENDED_PLATFORM
  337. select M486
  338. select X86_REBOOTFIXUPS
  339. ---help---
  340. This option is needed for RDC R-321x system-on-chip, also known
  341. as R-8610-(G).
  342. If you don't have one of these chips, you should say N here.
  343. config X86_32_NON_STANDARD
  344. bool "Support non-standard 32-bit SMP architectures"
  345. depends on X86_32 && SMP
  346. depends on X86_EXTENDED_PLATFORM
  347. ---help---
  348. This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
  349. subarchitectures. It is intended for a generic binary kernel.
  350. if you select them all, kernel will probe it one by one. and will
  351. fallback to default.
  352. # Alphabetically sorted list of Non standard 32 bit platforms
  353. config X86_NUMAQ
  354. bool "NUMAQ (IBM/Sequent)"
  355. depends on X86_32_NON_STANDARD
  356. depends on PCI
  357. select NUMA
  358. select X86_MPPARSE
  359. ---help---
  360. This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
  361. NUMA multiquad box. This changes the way that processors are
  362. bootstrapped, and uses Clustered Logical APIC addressing mode instead
  363. of Flat Logical. You will need a new lynxer.elf file to flash your
  364. firmware with - send email to <Martin.Bligh@us.ibm.com>.
  365. config X86_SUPPORTS_MEMORY_FAILURE
  366. def_bool y
  367. # MCE code calls memory_failure():
  368. depends on X86_MCE
  369. # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
  370. depends on !X86_NUMAQ
  371. # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
  372. depends on X86_64 || !SPARSEMEM
  373. select ARCH_SUPPORTS_MEMORY_FAILURE
  374. config X86_VISWS
  375. bool "SGI 320/540 (Visual Workstation)"
  376. depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
  377. depends on X86_32_NON_STANDARD
  378. ---help---
  379. The SGI Visual Workstation series is an IA32-based workstation
  380. based on SGI systems chips with some legacy PC hardware attached.
  381. Say Y here to create a kernel to run on the SGI 320 or 540.
  382. A kernel compiled for the Visual Workstation will run on general
  383. PCs as well. See <file:Documentation/sgi-visws.txt> for details.
  384. config X86_SUMMIT
  385. bool "Summit/EXA (IBM x440)"
  386. depends on X86_32_NON_STANDARD
  387. ---help---
  388. This option is needed for IBM systems that use the Summit/EXA chipset.
  389. In particular, it is needed for the x440.
  390. config X86_ES7000
  391. bool "Unisys ES7000 IA32 series"
  392. depends on X86_32_NON_STANDARD && X86_BIGSMP
  393. ---help---
  394. Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
  395. supposed to run on an IA32-based Unisys ES7000 system.
  396. config X86_32_IRIS
  397. tristate "Eurobraille/Iris poweroff module"
  398. depends on X86_32
  399. ---help---
  400. The Iris machines from EuroBraille do not have APM or ACPI support
  401. to shut themselves down properly. A special I/O sequence is
  402. needed to do so, which is what this module does at
  403. kernel shutdown.
  404. This is only for Iris machines from EuroBraille.
  405. If unused, say N.
  406. config SCHED_OMIT_FRAME_POINTER
  407. def_bool y
  408. prompt "Single-depth WCHAN output"
  409. depends on X86
  410. ---help---
  411. Calculate simpler /proc/<PID>/wchan values. If this option
  412. is disabled then wchan values will recurse back to the
  413. caller function. This provides more accurate wchan values,
  414. at the expense of slightly more scheduling overhead.
  415. If in doubt, say "Y".
  416. menuconfig PARAVIRT_GUEST
  417. bool "Paravirtualized guest support"
  418. ---help---
  419. Say Y here to get to see options related to running Linux under
  420. various hypervisors. This option alone does not add any kernel code.
  421. If you say N, all options in this submenu will be skipped and disabled.
  422. if PARAVIRT_GUEST
  423. source "arch/x86/xen/Kconfig"
  424. config KVM_CLOCK
  425. bool "KVM paravirtualized clock"
  426. select PARAVIRT
  427. select PARAVIRT_CLOCK
  428. ---help---
  429. Turning on this option will allow you to run a paravirtualized clock
  430. when running over the KVM hypervisor. Instead of relying on a PIT
  431. (or probably other) emulation by the underlying device model, the host
  432. provides the guest with timing infrastructure such as time of day, and
  433. system time
  434. config KVM_GUEST
  435. bool "KVM Guest support"
  436. select PARAVIRT
  437. ---help---
  438. This option enables various optimizations for running under the KVM
  439. hypervisor.
  440. source "arch/x86/lguest/Kconfig"
  441. config PARAVIRT
  442. bool "Enable paravirtualization code"
  443. ---help---
  444. This changes the kernel so it can modify itself when it is run
  445. under a hypervisor, potentially improving performance significantly
  446. over full virtualization. However, when run without a hypervisor
  447. the kernel is theoretically slower and slightly larger.
  448. config PARAVIRT_SPINLOCKS
  449. bool "Paravirtualization layer for spinlocks"
  450. depends on PARAVIRT && SMP && EXPERIMENTAL
  451. ---help---
  452. Paravirtualized spinlocks allow a pvops backend to replace the
  453. spinlock implementation with something virtualization-friendly
  454. (for example, block the virtual CPU rather than spinning).
  455. Unfortunately the downside is an up to 5% performance hit on
  456. native kernels, with various workloads.
  457. If you are unsure how to answer this question, answer N.
  458. config PARAVIRT_CLOCK
  459. bool
  460. endif
  461. config PARAVIRT_DEBUG
  462. bool "paravirt-ops debugging"
  463. depends on PARAVIRT && DEBUG_KERNEL
  464. ---help---
  465. Enable to debug paravirt_ops internals. Specifically, BUG if
  466. a paravirt_op is missing when it is called.
  467. config NO_BOOTMEM
  468. def_bool y
  469. config MEMTEST
  470. bool "Memtest"
  471. ---help---
  472. This option adds a kernel parameter 'memtest', which allows memtest
  473. to be set.
  474. memtest=0, mean disabled; -- default
  475. memtest=1, mean do 1 test pattern;
  476. ...
  477. memtest=4, mean do 4 test patterns.
  478. If you are unsure how to answer this question, answer N.
  479. config X86_SUMMIT_NUMA
  480. def_bool y
  481. depends on X86_32 && NUMA && X86_32_NON_STANDARD
  482. config X86_CYCLONE_TIMER
  483. def_bool y
  484. depends on X86_32_NON_STANDARD
  485. source "arch/x86/Kconfig.cpu"
  486. config HPET_TIMER
  487. def_bool X86_64
  488. prompt "HPET Timer Support" if X86_32
  489. ---help---
  490. Use the IA-PC HPET (High Precision Event Timer) to manage
  491. time in preference to the PIT and RTC, if a HPET is
  492. present.
  493. HPET is the next generation timer replacing legacy 8254s.
  494. The HPET provides a stable time base on SMP
  495. systems, unlike the TSC, but it is more expensive to access,
  496. as it is off-chip. You can find the HPET spec at
  497. <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
  498. You can safely choose Y here. However, HPET will only be
  499. activated if the platform and the BIOS support this feature.
  500. Otherwise the 8254 will be used for timing services.
  501. Choose N to continue using the legacy 8254 timer.
  502. config HPET_EMULATE_RTC
  503. def_bool y
  504. depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
  505. config APB_TIMER
  506. def_bool y if MRST
  507. prompt "Langwell APB Timer Support" if X86_MRST
  508. help
  509. APB timer is the replacement for 8254, HPET on X86 MID platforms.
  510. The APBT provides a stable time base on SMP
  511. systems, unlike the TSC, but it is more expensive to access,
  512. as it is off-chip. APB timers are always running regardless of CPU
  513. C states, they are used as per CPU clockevent device when possible.
  514. # Mark as expert because too many people got it wrong.
  515. # The code disables itself when not needed.
  516. config DMI
  517. default y
  518. bool "Enable DMI scanning" if EXPERT
  519. ---help---
  520. Enabled scanning of DMI to identify machine quirks. Say Y
  521. here unless you have verified that your setup is not
  522. affected by entries in the DMI blacklist. Required by PNP
  523. BIOS code.
  524. config GART_IOMMU
  525. bool "GART IOMMU support" if EXPERT
  526. default y
  527. select SWIOTLB
  528. depends on X86_64 && PCI && AMD_NB
  529. ---help---
  530. Support for full DMA access of devices with 32bit memory access only
  531. on systems with more than 3GB. This is usually needed for USB,
  532. sound, many IDE/SATA chipsets and some other devices.
  533. Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
  534. based hardware IOMMU and a software bounce buffer based IOMMU used
  535. on Intel systems and as fallback.
  536. The code is only active when needed (enough memory and limited
  537. device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
  538. too.
  539. config CALGARY_IOMMU
  540. bool "IBM Calgary IOMMU support"
  541. select SWIOTLB
  542. depends on X86_64 && PCI && EXPERIMENTAL
  543. ---help---
  544. Support for hardware IOMMUs in IBM's xSeries x366 and x460
  545. systems. Needed to run systems with more than 3GB of memory
  546. properly with 32-bit PCI devices that do not support DAC
  547. (Double Address Cycle). Calgary also supports bus level
  548. isolation, where all DMAs pass through the IOMMU. This
  549. prevents them from going anywhere except their intended
  550. destination. This catches hard-to-find kernel bugs and
  551. mis-behaving drivers and devices that do not use the DMA-API
  552. properly to set up their DMA buffers. The IOMMU can be
  553. turned off at boot time with the iommu=off parameter.
  554. Normally the kernel will make the right choice by itself.
  555. If unsure, say Y.
  556. config CALGARY_IOMMU_ENABLED_BY_DEFAULT
  557. def_bool y
  558. prompt "Should Calgary be enabled by default?"
  559. depends on CALGARY_IOMMU
  560. ---help---
  561. Should Calgary be enabled by default? if you choose 'y', Calgary
  562. will be used (if it exists). If you choose 'n', Calgary will not be
  563. used even if it exists. If you choose 'n' and would like to use
  564. Calgary anyway, pass 'iommu=calgary' on the kernel command line.
  565. If unsure, say Y.
  566. # need this always selected by IOMMU for the VIA workaround
  567. config SWIOTLB
  568. def_bool y if X86_64
  569. ---help---
  570. Support for software bounce buffers used on x86-64 systems
  571. which don't have a hardware IOMMU (e.g. the current generation
  572. of Intel's x86-64 CPUs). Using this PCI devices which can only
  573. access 32-bits of memory can be used on systems with more than
  574. 3 GB of memory. If unsure, say Y.
  575. config IOMMU_HELPER
  576. def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
  577. config MAXSMP
  578. bool "Enable Maximum number of SMP Processors and NUMA Nodes"
  579. depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
  580. select CPUMASK_OFFSTACK
  581. ---help---
  582. Enable maximum number of CPUS and NUMA Nodes for this architecture.
  583. If unsure, say N.
  584. config NR_CPUS
  585. int "Maximum number of CPUs" if SMP && !MAXSMP
  586. range 2 8 if SMP && X86_32 && !X86_BIGSMP
  587. range 2 512 if SMP && !MAXSMP
  588. default "1" if !SMP
  589. default "4096" if MAXSMP
  590. default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
  591. default "8" if SMP
  592. ---help---
  593. This allows you to specify the maximum number of CPUs which this
  594. kernel will support. The maximum supported value is 512 and the
  595. minimum value which makes sense is 2.
  596. This is purely to save memory - each supported CPU adds
  597. approximately eight kilobytes to the kernel image.
  598. config SCHED_SMT
  599. bool "SMT (Hyperthreading) scheduler support"
  600. depends on X86_HT
  601. ---help---
  602. SMT scheduler support improves the CPU scheduler's decision making
  603. when dealing with Intel Pentium 4 chips with HyperThreading at a
  604. cost of slightly increased overhead in some places. If unsure say
  605. N here.
  606. config SCHED_MC
  607. def_bool y
  608. prompt "Multi-core scheduler support"
  609. depends on X86_HT
  610. ---help---
  611. Multi-core scheduler support improves the CPU scheduler's decision
  612. making when dealing with multi-core CPU chips at a cost of slightly
  613. increased overhead in some places. If unsure say N here.
  614. config IRQ_TIME_ACCOUNTING
  615. bool "Fine granularity task level IRQ time accounting"
  616. default n
  617. ---help---
  618. Select this option to enable fine granularity task irq time
  619. accounting. This is done by reading a timestamp on each
  620. transitions between softirq and hardirq state, so there can be a
  621. small performance impact.
  622. If in doubt, say N here.
  623. source "kernel/Kconfig.preempt"
  624. config X86_UP_APIC
  625. bool "Local APIC support on uniprocessors"
  626. depends on X86_32 && !SMP && !X86_32_NON_STANDARD
  627. ---help---
  628. A local APIC (Advanced Programmable Interrupt Controller) is an
  629. integrated interrupt controller in the CPU. If you have a single-CPU
  630. system which has a processor with a local APIC, you can say Y here to
  631. enable and use it. If you say Y here even though your machine doesn't
  632. have a local APIC, then the kernel will still run with no slowdown at
  633. all. The local APIC supports CPU-generated self-interrupts (timer,
  634. performance counters), and the NMI watchdog which detects hard
  635. lockups.
  636. config X86_UP_IOAPIC
  637. bool "IO-APIC support on uniprocessors"
  638. depends on X86_UP_APIC
  639. ---help---
  640. An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
  641. SMP-capable replacement for PC-style interrupt controllers. Most
  642. SMP systems and many recent uniprocessor systems have one.
  643. If you have a single-CPU system with an IO-APIC, you can say Y here
  644. to use it. If you say Y here even though your machine doesn't have
  645. an IO-APIC, then the kernel will still run with no slowdown at all.
  646. config X86_LOCAL_APIC
  647. def_bool y
  648. depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
  649. config X86_IO_APIC
  650. def_bool y
  651. depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
  652. config X86_VISWS_APIC
  653. def_bool y
  654. depends on X86_32 && X86_VISWS
  655. config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
  656. bool "Reroute for broken boot IRQs"
  657. depends on X86_IO_APIC
  658. ---help---
  659. This option enables a workaround that fixes a source of
  660. spurious interrupts. This is recommended when threaded
  661. interrupt handling is used on systems where the generation of
  662. superfluous "boot interrupts" cannot be disabled.
  663. Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
  664. entry in the chipset's IO-APIC is masked (as, e.g. the RT
  665. kernel does during interrupt handling). On chipsets where this
  666. boot IRQ generation cannot be disabled, this workaround keeps
  667. the original IRQ line masked so that only the equivalent "boot
  668. IRQ" is delivered to the CPUs. The workaround also tells the
  669. kernel to set up the IRQ handler on the boot IRQ line. In this
  670. way only one interrupt is delivered to the kernel. Otherwise
  671. the spurious second interrupt may cause the kernel to bring
  672. down (vital) interrupt lines.
  673. Only affects "broken" chipsets. Interrupt sharing may be
  674. increased on these systems.
  675. config X86_MCE
  676. bool "Machine Check / overheating reporting"
  677. ---help---
  678. Machine Check support allows the processor to notify the
  679. kernel if it detects a problem (e.g. overheating, data corruption).
  680. The action the kernel takes depends on the severity of the problem,
  681. ranging from warning messages to halting the machine.
  682. config X86_MCE_INTEL
  683. def_bool y
  684. prompt "Intel MCE features"
  685. depends on X86_MCE && X86_LOCAL_APIC
  686. ---help---
  687. Additional support for intel specific MCE features such as
  688. the thermal monitor.
  689. config X86_MCE_AMD
  690. def_bool y
  691. prompt "AMD MCE features"
  692. depends on X86_MCE && X86_LOCAL_APIC
  693. ---help---
  694. Additional support for AMD specific MCE features such as
  695. the DRAM Error Threshold.
  696. config X86_ANCIENT_MCE
  697. bool "Support for old Pentium 5 / WinChip machine checks"
  698. depends on X86_32 && X86_MCE
  699. ---help---
  700. Include support for machine check handling on old Pentium 5 or WinChip
  701. systems. These typically need to be enabled explicitely on the command
  702. line.
  703. config X86_MCE_THRESHOLD
  704. depends on X86_MCE_AMD || X86_MCE_INTEL
  705. def_bool y
  706. config X86_MCE_INJECT
  707. depends on X86_MCE
  708. tristate "Machine check injector support"
  709. ---help---
  710. Provide support for injecting machine checks for testing purposes.
  711. If you don't know what a machine check is and you don't do kernel
  712. QA it is safe to say n.
  713. config X86_THERMAL_VECTOR
  714. def_bool y
  715. depends on X86_MCE_INTEL
  716. config VM86
  717. bool "Enable VM86 support" if EXPERT
  718. default y
  719. depends on X86_32
  720. ---help---
  721. This option is required by programs like DOSEMU to run 16-bit legacy
  722. code on X86 processors. It also may be needed by software like
  723. XFree86 to initialize some video cards via BIOS. Disabling this
  724. option saves about 6k.
  725. config TOSHIBA
  726. tristate "Toshiba Laptop support"
  727. depends on X86_32
  728. ---help---
  729. This adds a driver to safely access the System Management Mode of
  730. the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
  731. not work on models with a Phoenix BIOS. The System Management Mode
  732. is used to set the BIOS and power saving options on Toshiba portables.
  733. For information on utilities to make use of this driver see the
  734. Toshiba Linux utilities web site at:
  735. <http://www.buzzard.org.uk/toshiba/>.
  736. Say Y if you intend to run this kernel on a Toshiba portable.
  737. Say N otherwise.
  738. config I8K
  739. tristate "Dell laptop support"
  740. select HWMON
  741. ---help---
  742. This adds a driver to safely access the System Management Mode
  743. of the CPU on the Dell Inspiron 8000. The System Management Mode
  744. is used to read cpu temperature and cooling fan status and to
  745. control the fans on the I8K portables.
  746. This driver has been tested only on the Inspiron 8000 but it may
  747. also work with other Dell laptops. You can force loading on other
  748. models by passing the parameter `force=1' to the module. Use at
  749. your own risk.
  750. For information on utilities to make use of this driver see the
  751. I8K Linux utilities web site at:
  752. <http://people.debian.org/~dz/i8k/>
  753. Say Y if you intend to run this kernel on a Dell Inspiron 8000.
  754. Say N otherwise.
  755. config X86_REBOOTFIXUPS
  756. bool "Enable X86 board specific fixups for reboot"
  757. depends on X86_32
  758. ---help---
  759. This enables chipset and/or board specific fixups to be done
  760. in order to get reboot to work correctly. This is only needed on
  761. some combinations of hardware and BIOS. The symptom, for which
  762. this config is intended, is when reboot ends with a stalled/hung
  763. system.
  764. Currently, the only fixup is for the Geode machines using
  765. CS5530A and CS5536 chipsets and the RDC R-321x SoC.
  766. Say Y if you want to enable the fixup. Currently, it's safe to
  767. enable this option even if you don't need it.
  768. Say N otherwise.
  769. config MICROCODE
  770. tristate "/dev/cpu/microcode - microcode support"
  771. select FW_LOADER
  772. ---help---
  773. If you say Y here, you will be able to update the microcode on
  774. certain Intel and AMD processors. The Intel support is for the
  775. IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
  776. Pentium 4, Xeon etc. The AMD support is for family 0x10 and
  777. 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
  778. You will obviously need the actual microcode binary data itself
  779. which is not shipped with the Linux kernel.
  780. This option selects the general module only, you need to select
  781. at least one vendor specific module as well.
  782. To compile this driver as a module, choose M here: the
  783. module will be called microcode.
  784. config MICROCODE_INTEL
  785. bool "Intel microcode patch loading support"
  786. depends on MICROCODE
  787. default MICROCODE
  788. select FW_LOADER
  789. ---help---
  790. This options enables microcode patch loading support for Intel
  791. processors.
  792. For latest news and information on obtaining all the required
  793. Intel ingredients for this driver, check:
  794. <http://www.urbanmyth.org/microcode/>.
  795. config MICROCODE_AMD
  796. bool "AMD microcode patch loading support"
  797. depends on MICROCODE
  798. select FW_LOADER
  799. ---help---
  800. If you select this option, microcode patch loading support for AMD
  801. processors will be enabled.
  802. config MICROCODE_OLD_INTERFACE
  803. def_bool y
  804. depends on MICROCODE
  805. config X86_MSR
  806. tristate "/dev/cpu/*/msr - Model-specific register support"
  807. ---help---
  808. This device gives privileged processes access to the x86
  809. Model-Specific Registers (MSRs). It is a character device with
  810. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  811. MSR accesses are directed to a specific CPU on multi-processor
  812. systems.
  813. config X86_CPUID
  814. tristate "/dev/cpu/*/cpuid - CPU information support"
  815. ---help---
  816. This device gives processes access to the x86 CPUID instruction to
  817. be executed on a specific processor. It is a character device
  818. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  819. /dev/cpu/31/cpuid.
  820. choice
  821. prompt "High Memory Support"
  822. default HIGHMEM64G if X86_NUMAQ
  823. default HIGHMEM4G
  824. depends on X86_32
  825. config NOHIGHMEM
  826. bool "off"
  827. depends on !X86_NUMAQ
  828. ---help---
  829. Linux can use up to 64 Gigabytes of physical memory on x86 systems.
  830. However, the address space of 32-bit x86 processors is only 4
  831. Gigabytes large. That means that, if you have a large amount of
  832. physical memory, not all of it can be "permanently mapped" by the
  833. kernel. The physical memory that's not permanently mapped is called
  834. "high memory".
  835. If you are compiling a kernel which will never run on a machine with
  836. more than 1 Gigabyte total physical RAM, answer "off" here (default
  837. choice and suitable for most users). This will result in a "3GB/1GB"
  838. split: 3GB are mapped so that each process sees a 3GB virtual memory
  839. space and the remaining part of the 4GB virtual memory space is used
  840. by the kernel to permanently map as much physical memory as
  841. possible.
  842. If the machine has between 1 and 4 Gigabytes physical RAM, then
  843. answer "4GB" here.
  844. If more than 4 Gigabytes is used then answer "64GB" here. This
  845. selection turns Intel PAE (Physical Address Extension) mode on.
  846. PAE implements 3-level paging on IA32 processors. PAE is fully
  847. supported by Linux, PAE mode is implemented on all recent Intel
  848. processors (Pentium Pro and better). NOTE: If you say "64GB" here,
  849. then the kernel will not boot on CPUs that don't support PAE!
  850. The actual amount of total physical memory will either be
  851. auto detected or can be forced by using a kernel command line option
  852. such as "mem=256M". (Try "man bootparam" or see the documentation of
  853. your boot loader (lilo or loadlin) about how to pass options to the
  854. kernel at boot time.)
  855. If unsure, say "off".
  856. config HIGHMEM4G
  857. bool "4GB"
  858. depends on !X86_NUMAQ
  859. ---help---
  860. Select this if you have a 32-bit processor and between 1 and 4
  861. gigabytes of physical RAM.
  862. config HIGHMEM64G
  863. bool "64GB"
  864. depends on !M386 && !M486
  865. select X86_PAE
  866. ---help---
  867. Select this if you have a 32-bit processor and more than 4
  868. gigabytes of physical RAM.
  869. endchoice
  870. choice
  871. depends on EXPERIMENTAL
  872. prompt "Memory split" if EXPERT
  873. default VMSPLIT_3G
  874. depends on X86_32
  875. ---help---
  876. Select the desired split between kernel and user memory.
  877. If the address range available to the kernel is less than the
  878. physical memory installed, the remaining memory will be available
  879. as "high memory". Accessing high memory is a little more costly
  880. than low memory, as it needs to be mapped into the kernel first.
  881. Note that increasing the kernel address space limits the range
  882. available to user programs, making the address space there
  883. tighter. Selecting anything other than the default 3G/1G split
  884. will also likely make your kernel incompatible with binary-only
  885. kernel modules.
  886. If you are not absolutely sure what you are doing, leave this
  887. option alone!
  888. config VMSPLIT_3G
  889. bool "3G/1G user/kernel split"
  890. config VMSPLIT_3G_OPT
  891. depends on !X86_PAE
  892. bool "3G/1G user/kernel split (for full 1G low memory)"
  893. config VMSPLIT_2G
  894. bool "2G/2G user/kernel split"
  895. config VMSPLIT_2G_OPT
  896. depends on !X86_PAE
  897. bool "2G/2G user/kernel split (for full 2G low memory)"
  898. config VMSPLIT_1G
  899. bool "1G/3G user/kernel split"
  900. endchoice
  901. config PAGE_OFFSET
  902. hex
  903. default 0xB0000000 if VMSPLIT_3G_OPT
  904. default 0x80000000 if VMSPLIT_2G
  905. default 0x78000000 if VMSPLIT_2G_OPT
  906. default 0x40000000 if VMSPLIT_1G
  907. default 0xC0000000
  908. depends on X86_32
  909. config HIGHMEM
  910. def_bool y
  911. depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
  912. config X86_PAE
  913. bool "PAE (Physical Address Extension) Support"
  914. depends on X86_32 && !HIGHMEM4G
  915. ---help---
  916. PAE is required for NX support, and furthermore enables
  917. larger swapspace support for non-overcommit purposes. It
  918. has the cost of more pagetable lookup overhead, and also
  919. consumes more pagetable space per process.
  920. config ARCH_PHYS_ADDR_T_64BIT
  921. def_bool X86_64 || X86_PAE
  922. config ARCH_DMA_ADDR_T_64BIT
  923. def_bool X86_64 || HIGHMEM64G
  924. config DIRECT_GBPAGES
  925. bool "Enable 1GB pages for kernel pagetables" if EXPERT
  926. default y
  927. depends on X86_64
  928. ---help---
  929. Allow the kernel linear mapping to use 1GB pages on CPUs that
  930. support it. This can improve the kernel's performance a tiny bit by
  931. reducing TLB pressure. If in doubt, say "Y".
  932. # Common NUMA Features
  933. config NUMA
  934. bool "Numa Memory Allocation and Scheduler Support"
  935. depends on SMP
  936. depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
  937. default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
  938. ---help---
  939. Enable NUMA (Non Uniform Memory Access) support.
  940. The kernel will try to allocate memory used by a CPU on the
  941. local memory controller of the CPU and add some more
  942. NUMA awareness to the kernel.
  943. For 64-bit this is recommended if the system is Intel Core i7
  944. (or later), AMD Opteron, or EM64T NUMA.
  945. For 32-bit this is only needed on (rare) 32-bit-only platforms
  946. that support NUMA topologies, such as NUMAQ / Summit, or if you
  947. boot a 32-bit kernel on a 64-bit NUMA platform.
  948. Otherwise, you should say N.
  949. comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
  950. depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
  951. config AMD_NUMA
  952. def_bool y
  953. prompt "Old style AMD Opteron NUMA detection"
  954. depends on X86_64 && NUMA && PCI
  955. ---help---
  956. Enable AMD NUMA node topology detection. You should say Y here if
  957. you have a multi processor AMD system. This uses an old method to
  958. read the NUMA configuration directly from the builtin Northbridge
  959. of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
  960. which also takes priority if both are compiled in.
  961. config X86_64_ACPI_NUMA
  962. def_bool y
  963. prompt "ACPI NUMA detection"
  964. depends on X86_64 && NUMA && ACPI && PCI
  965. select ACPI_NUMA
  966. ---help---
  967. Enable ACPI SRAT based node topology detection.
  968. # Some NUMA nodes have memory ranges that span
  969. # other nodes. Even though a pfn is valid and
  970. # between a node's start and end pfns, it may not
  971. # reside on that node. See memmap_init_zone()
  972. # for details.
  973. config NODES_SPAN_OTHER_NODES
  974. def_bool y
  975. depends on X86_64_ACPI_NUMA
  976. config NUMA_EMU
  977. bool "NUMA emulation"
  978. depends on NUMA
  979. ---help---
  980. Enable NUMA emulation. A flat machine will be split
  981. into virtual nodes when booted with "numa=fake=N", where N is the
  982. number of nodes. This is only useful for debugging.
  983. config NODES_SHIFT
  984. int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
  985. range 1 10
  986. default "10" if MAXSMP
  987. default "6" if X86_64
  988. default "4" if X86_NUMAQ
  989. default "3"
  990. depends on NEED_MULTIPLE_NODES
  991. ---help---
  992. Specify the maximum number of NUMA Nodes available on the target
  993. system. Increases memory reserved to accommodate various tables.
  994. config HAVE_ARCH_BOOTMEM
  995. def_bool y
  996. depends on X86_32 && NUMA
  997. config HAVE_ARCH_ALLOC_REMAP
  998. def_bool y
  999. depends on X86_32 && NUMA
  1000. config ARCH_HAVE_MEMORY_PRESENT
  1001. def_bool y
  1002. depends on X86_32 && DISCONTIGMEM
  1003. config NEED_NODE_MEMMAP_SIZE
  1004. def_bool y
  1005. depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
  1006. config ARCH_FLATMEM_ENABLE
  1007. def_bool y
  1008. depends on X86_32 && !NUMA
  1009. config ARCH_DISCONTIGMEM_ENABLE
  1010. def_bool y
  1011. depends on NUMA && X86_32
  1012. config ARCH_DISCONTIGMEM_DEFAULT
  1013. def_bool y
  1014. depends on NUMA && X86_32
  1015. config ARCH_SPARSEMEM_ENABLE
  1016. def_bool y
  1017. depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
  1018. select SPARSEMEM_STATIC if X86_32
  1019. select SPARSEMEM_VMEMMAP_ENABLE if X86_64
  1020. config ARCH_SPARSEMEM_DEFAULT
  1021. def_bool y
  1022. depends on X86_64
  1023. config ARCH_SELECT_MEMORY_MODEL
  1024. def_bool y
  1025. depends on ARCH_SPARSEMEM_ENABLE
  1026. config ARCH_MEMORY_PROBE
  1027. def_bool X86_64
  1028. depends on MEMORY_HOTPLUG
  1029. config ARCH_PROC_KCORE_TEXT
  1030. def_bool y
  1031. depends on X86_64 && PROC_KCORE
  1032. config ILLEGAL_POINTER_VALUE
  1033. hex
  1034. default 0 if X86_32
  1035. default 0xdead000000000000 if X86_64
  1036. source "mm/Kconfig"
  1037. config HIGHPTE
  1038. bool "Allocate 3rd-level pagetables from highmem"
  1039. depends on HIGHMEM
  1040. ---help---
  1041. The VM uses one page table entry for each page of physical memory.
  1042. For systems with a lot of RAM, this can be wasteful of precious
  1043. low memory. Setting this option will put user-space page table
  1044. entries in high memory.
  1045. config X86_CHECK_BIOS_CORRUPTION
  1046. bool "Check for low memory corruption"
  1047. ---help---
  1048. Periodically check for memory corruption in low memory, which
  1049. is suspected to be caused by BIOS. Even when enabled in the
  1050. configuration, it is disabled at runtime. Enable it by
  1051. setting "memory_corruption_check=1" on the kernel command
  1052. line. By default it scans the low 64k of memory every 60
  1053. seconds; see the memory_corruption_check_size and
  1054. memory_corruption_check_period parameters in
  1055. Documentation/kernel-parameters.txt to adjust this.
  1056. When enabled with the default parameters, this option has
  1057. almost no overhead, as it reserves a relatively small amount
  1058. of memory and scans it infrequently. It both detects corruption
  1059. and prevents it from affecting the running system.
  1060. It is, however, intended as a diagnostic tool; if repeatable
  1061. BIOS-originated corruption always affects the same memory,
  1062. you can use memmap= to prevent the kernel from using that
  1063. memory.
  1064. config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
  1065. bool "Set the default setting of memory_corruption_check"
  1066. depends on X86_CHECK_BIOS_CORRUPTION
  1067. default y
  1068. ---help---
  1069. Set whether the default state of memory_corruption_check is
  1070. on or off.
  1071. config X86_RESERVE_LOW
  1072. int "Amount of low memory, in kilobytes, to reserve for the BIOS"
  1073. default 64
  1074. range 4 640
  1075. ---help---
  1076. Specify the amount of low memory to reserve for the BIOS.
  1077. The first page contains BIOS data structures that the kernel
  1078. must not use, so that page must always be reserved.
  1079. By default we reserve the first 64K of physical RAM, as a
  1080. number of BIOSes are known to corrupt that memory range
  1081. during events such as suspend/resume or monitor cable
  1082. insertion, so it must not be used by the kernel.
  1083. You can set this to 4 if you are absolutely sure that you
  1084. trust the BIOS to get all its memory reservations and usages
  1085. right. If you know your BIOS have problems beyond the
  1086. default 64K area, you can set this to 640 to avoid using the
  1087. entire low memory range.
  1088. If you have doubts about the BIOS (e.g. suspend/resume does
  1089. not work or there's kernel crashes after certain hardware
  1090. hotplug events) then you might want to enable
  1091. X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
  1092. typical corruption patterns.
  1093. Leave this to the default value of 64 if you are unsure.
  1094. config MATH_EMULATION
  1095. bool
  1096. prompt "Math emulation" if X86_32
  1097. ---help---
  1098. Linux can emulate a math coprocessor (used for floating point
  1099. operations) if you don't have one. 486DX and Pentium processors have
  1100. a math coprocessor built in, 486SX and 386 do not, unless you added
  1101. a 487DX or 387, respectively. (The messages during boot time can
  1102. give you some hints here ["man dmesg"].) Everyone needs either a
  1103. coprocessor or this emulation.
  1104. If you don't have a math coprocessor, you need to say Y here; if you
  1105. say Y here even though you have a coprocessor, the coprocessor will
  1106. be used nevertheless. (This behavior can be changed with the kernel
  1107. command line option "no387", which comes handy if your coprocessor
  1108. is broken. Try "man bootparam" or see the documentation of your boot
  1109. loader (lilo or loadlin) about how to pass options to the kernel at
  1110. boot time.) This means that it is a good idea to say Y here if you
  1111. intend to use this kernel on different machines.
  1112. More information about the internals of the Linux math coprocessor
  1113. emulation can be found in <file:arch/x86/math-emu/README>.
  1114. If you are not sure, say Y; apart from resulting in a 66 KB bigger
  1115. kernel, it won't hurt.
  1116. config MTRR
  1117. def_bool y
  1118. prompt "MTRR (Memory Type Range Register) support" if EXPERT
  1119. ---help---
  1120. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  1121. the Memory Type Range Registers (MTRRs) may be used to control
  1122. processor access to memory ranges. This is most useful if you have
  1123. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  1124. allows bus write transfers to be combined into a larger transfer
  1125. before bursting over the PCI/AGP bus. This can increase performance
  1126. of image write operations 2.5 times or more. Saying Y here creates a
  1127. /proc/mtrr file which may be used to manipulate your processor's
  1128. MTRRs. Typically the X server should use this.
  1129. This code has a reasonably generic interface so that similar
  1130. control registers on other processors can be easily supported
  1131. as well:
  1132. The Cyrix 6x86, 6x86MX and M II processors have Address Range
  1133. Registers (ARRs) which provide a similar functionality to MTRRs. For
  1134. these, the ARRs are used to emulate the MTRRs.
  1135. The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
  1136. MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
  1137. write-combining. All of these processors are supported by this code
  1138. and it makes sense to say Y here if you have one of them.
  1139. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  1140. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  1141. can lead to all sorts of problems, so it's good to say Y here.
  1142. You can safely say Y even if your machine doesn't have MTRRs, you'll
  1143. just add about 9 KB to your kernel.
  1144. See <file:Documentation/x86/mtrr.txt> for more information.
  1145. config MTRR_SANITIZER
  1146. def_bool y
  1147. prompt "MTRR cleanup support"
  1148. depends on MTRR
  1149. ---help---
  1150. Convert MTRR layout from continuous to discrete, so X drivers can
  1151. add writeback entries.
  1152. Can be disabled with disable_mtrr_cleanup on the kernel command line.
  1153. The largest mtrr entry size for a continuous block can be set with
  1154. mtrr_chunk_size.
  1155. If unsure, say Y.
  1156. config MTRR_SANITIZER_ENABLE_DEFAULT
  1157. int "MTRR cleanup enable value (0-1)"
  1158. range 0 1
  1159. default "0"
  1160. depends on MTRR_SANITIZER
  1161. ---help---
  1162. Enable mtrr cleanup default value
  1163. config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
  1164. int "MTRR cleanup spare reg num (0-7)"
  1165. range 0 7
  1166. default "1"
  1167. depends on MTRR_SANITIZER
  1168. ---help---
  1169. mtrr cleanup spare entries default, it can be changed via
  1170. mtrr_spare_reg_nr=N on the kernel command line.
  1171. config X86_PAT
  1172. def_bool y
  1173. prompt "x86 PAT support" if EXPERT
  1174. depends on MTRR
  1175. ---help---
  1176. Use PAT attributes to setup page level cache control.
  1177. PATs are the modern equivalents of MTRRs and are much more
  1178. flexible than MTRRs.
  1179. Say N here if you see bootup problems (boot crash, boot hang,
  1180. spontaneous reboots) or a non-working video driver.
  1181. If unsure, say Y.
  1182. config ARCH_USES_PG_UNCACHED
  1183. def_bool y
  1184. depends on X86_PAT
  1185. config EFI
  1186. bool "EFI runtime service support"
  1187. depends on ACPI
  1188. ---help---
  1189. This enables the kernel to use EFI runtime services that are
  1190. available (such as the EFI variable services).
  1191. This option is only useful on systems that have EFI firmware.
  1192. In addition, you should use the latest ELILO loader available
  1193. at <http://elilo.sourceforge.net> in order to take advantage
  1194. of EFI runtime services. However, even with this option, the
  1195. resultant kernel should continue to boot on existing non-EFI
  1196. platforms.
  1197. config SECCOMP
  1198. def_bool y
  1199. prompt "Enable seccomp to safely compute untrusted bytecode"
  1200. ---help---
  1201. This kernel feature is useful for number crunching applications
  1202. that may need to compute untrusted bytecode during their
  1203. execution. By using pipes or other transports made available to
  1204. the process as file descriptors supporting the read/write
  1205. syscalls, it's possible to isolate those applications in
  1206. their own address space using seccomp. Once seccomp is
  1207. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1208. and the task is only allowed to execute a few safe syscalls
  1209. defined by each seccomp mode.
  1210. If unsure, say Y. Only embedded should say N here.
  1211. config CC_STACKPROTECTOR
  1212. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1213. ---help---
  1214. This option turns on the -fstack-protector GCC feature. This
  1215. feature puts, at the beginning of functions, a canary value on
  1216. the stack just before the return address, and validates
  1217. the value just before actually returning. Stack based buffer
  1218. overflows (that need to overwrite this return address) now also
  1219. overwrite the canary, which gets detected and the attack is then
  1220. neutralized via a kernel panic.
  1221. This feature requires gcc version 4.2 or above, or a distribution
  1222. gcc with the feature backported. Older versions are automatically
  1223. detected and for those versions, this configuration option is
  1224. ignored. (and a warning is printed during bootup)
  1225. source kernel/Kconfig.hz
  1226. config KEXEC
  1227. bool "kexec system call"
  1228. ---help---
  1229. kexec is a system call that implements the ability to shutdown your
  1230. current kernel, and to start another kernel. It is like a reboot
  1231. but it is independent of the system firmware. And like a reboot
  1232. you can start any kernel with it, not just Linux.
  1233. The name comes from the similarity to the exec system call.
  1234. It is an ongoing process to be certain the hardware in a machine
  1235. is properly shutdown, so do not be surprised if this code does not
  1236. initially work for you. It may help to enable device hotplugging
  1237. support. As of this writing the exact hardware interface is
  1238. strongly in flux, so no good recommendation can be made.
  1239. config CRASH_DUMP
  1240. bool "kernel crash dumps"
  1241. depends on X86_64 || (X86_32 && HIGHMEM)
  1242. ---help---
  1243. Generate crash dump after being started by kexec.
  1244. This should be normally only set in special crash dump kernels
  1245. which are loaded in the main kernel with kexec-tools into
  1246. a specially reserved region and then later executed after
  1247. a crash by kdump/kexec. The crash dump kernel must be compiled
  1248. to a memory address not used by the main kernel or BIOS using
  1249. PHYSICAL_START, or it must be built as a relocatable image
  1250. (CONFIG_RELOCATABLE=y).
  1251. For more details see Documentation/kdump/kdump.txt
  1252. config KEXEC_JUMP
  1253. bool "kexec jump (EXPERIMENTAL)"
  1254. depends on EXPERIMENTAL
  1255. depends on KEXEC && HIBERNATION
  1256. ---help---
  1257. Jump between original kernel and kexeced kernel and invoke
  1258. code in physical address mode via KEXEC
  1259. config PHYSICAL_START
  1260. hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
  1261. default "0x1000000"
  1262. ---help---
  1263. This gives the physical address where the kernel is loaded.
  1264. If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
  1265. bzImage will decompress itself to above physical address and
  1266. run from there. Otherwise, bzImage will run from the address where
  1267. it has been loaded by the boot loader and will ignore above physical
  1268. address.
  1269. In normal kdump cases one does not have to set/change this option
  1270. as now bzImage can be compiled as a completely relocatable image
  1271. (CONFIG_RELOCATABLE=y) and be used to load and run from a different
  1272. address. This option is mainly useful for the folks who don't want
  1273. to use a bzImage for capturing the crash dump and want to use a
  1274. vmlinux instead. vmlinux is not relocatable hence a kernel needs
  1275. to be specifically compiled to run from a specific memory area
  1276. (normally a reserved region) and this option comes handy.
  1277. So if you are using bzImage for capturing the crash dump,
  1278. leave the value here unchanged to 0x1000000 and set
  1279. CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
  1280. for capturing the crash dump change this value to start of
  1281. the reserved region. In other words, it can be set based on
  1282. the "X" value as specified in the "crashkernel=YM@XM"
  1283. command line boot parameter passed to the panic-ed
  1284. kernel. Please take a look at Documentation/kdump/kdump.txt
  1285. for more details about crash dumps.
  1286. Usage of bzImage for capturing the crash dump is recommended as
  1287. one does not have to build two kernels. Same kernel can be used
  1288. as production kernel and capture kernel. Above option should have
  1289. gone away after relocatable bzImage support is introduced. But it
  1290. is present because there are users out there who continue to use
  1291. vmlinux for dump capture. This option should go away down the
  1292. line.
  1293. Don't change this unless you know what you are doing.
  1294. config RELOCATABLE
  1295. bool "Build a relocatable kernel"
  1296. default y
  1297. ---help---
  1298. This builds a kernel image that retains relocation information
  1299. so it can be loaded someplace besides the default 1MB.
  1300. The relocations tend to make the kernel binary about 10% larger,
  1301. but are discarded at runtime.
  1302. One use is for the kexec on panic case where the recovery kernel
  1303. must live at a different physical address than the primary
  1304. kernel.
  1305. Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
  1306. it has been loaded at and the compile time physical address
  1307. (CONFIG_PHYSICAL_START) is ignored.
  1308. # Relocation on x86-32 needs some additional build support
  1309. config X86_NEED_RELOCS
  1310. def_bool y
  1311. depends on X86_32 && RELOCATABLE
  1312. config PHYSICAL_ALIGN
  1313. hex "Alignment value to which kernel should be aligned" if X86_32
  1314. default "0x1000000"
  1315. range 0x2000 0x1000000
  1316. ---help---
  1317. This value puts the alignment restrictions on physical address
  1318. where kernel is loaded and run from. Kernel is compiled for an
  1319. address which meets above alignment restriction.
  1320. If bootloader loads the kernel at a non-aligned address and
  1321. CONFIG_RELOCATABLE is set, kernel will move itself to nearest
  1322. address aligned to above value and run from there.
  1323. If bootloader loads the kernel at a non-aligned address and
  1324. CONFIG_RELOCATABLE is not set, kernel will ignore the run time
  1325. load address and decompress itself to the address it has been
  1326. compiled for and run from there. The address for which kernel is
  1327. compiled already meets above alignment restrictions. Hence the
  1328. end result is that kernel runs from a physical address meeting
  1329. above alignment restrictions.
  1330. Don't change this unless you know what you are doing.
  1331. config HOTPLUG_CPU
  1332. bool "Support for hot-pluggable CPUs"
  1333. depends on SMP && HOTPLUG
  1334. ---help---
  1335. Say Y here to allow turning CPUs off and on. CPUs can be
  1336. controlled through /sys/devices/system/cpu.
  1337. ( Note: power management support will enable this option
  1338. automatically on SMP systems. )
  1339. Say N if you want to disable CPU hotplug.
  1340. config COMPAT_VDSO
  1341. def_bool y
  1342. prompt "Compat VDSO support"
  1343. depends on X86_32 || IA32_EMULATION
  1344. ---help---
  1345. Map the 32-bit VDSO to the predictable old-style address too.
  1346. Say N here if you are running a sufficiently recent glibc
  1347. version (2.3.3 or later), to remove the high-mapped
  1348. VDSO mapping and to exclusively use the randomized VDSO.
  1349. If unsure, say Y.
  1350. config CMDLINE_BOOL
  1351. bool "Built-in kernel command line"
  1352. ---help---
  1353. Allow for specifying boot arguments to the kernel at
  1354. build time. On some systems (e.g. embedded ones), it is
  1355. necessary or convenient to provide some or all of the
  1356. kernel boot arguments with the kernel itself (that is,
  1357. to not rely on the boot loader to provide them.)
  1358. To compile command line arguments into the kernel,
  1359. set this option to 'Y', then fill in the
  1360. the boot arguments in CONFIG_CMDLINE.
  1361. Systems with fully functional boot loaders (i.e. non-embedded)
  1362. should leave this option set to 'N'.
  1363. config CMDLINE
  1364. string "Built-in kernel command string"
  1365. depends on CMDLINE_BOOL
  1366. default ""
  1367. ---help---
  1368. Enter arguments here that should be compiled into the kernel
  1369. image and used at boot time. If the boot loader provides a
  1370. command line at boot time, it is appended to this string to
  1371. form the full kernel command line, when the system boots.
  1372. However, you can use the CONFIG_CMDLINE_OVERRIDE option to
  1373. change this behavior.
  1374. In most cases, the command line (whether built-in or provided
  1375. by the boot loader) should specify the device for the root
  1376. file system.
  1377. config CMDLINE_OVERRIDE
  1378. bool "Built-in command line overrides boot loader arguments"
  1379. depends on CMDLINE_BOOL
  1380. ---help---
  1381. Set this option to 'Y' to have the kernel ignore the boot loader
  1382. command line, and use ONLY the built-in command line.
  1383. This is used to work around broken boot loaders. This should
  1384. be set to 'N' under normal conditions.
  1385. endmenu
  1386. config ARCH_ENABLE_MEMORY_HOTPLUG
  1387. def_bool y
  1388. depends on X86_64 || (X86_32 && HIGHMEM)
  1389. config ARCH_ENABLE_MEMORY_HOTREMOVE
  1390. def_bool y
  1391. depends on MEMORY_HOTPLUG
  1392. config USE_PERCPU_NUMA_NODE_ID
  1393. def_bool y
  1394. depends on NUMA
  1395. menu "Power management and ACPI options"
  1396. config ARCH_HIBERNATION_HEADER
  1397. def_bool y
  1398. depends on X86_64 && HIBERNATION
  1399. source "kernel/power/Kconfig"
  1400. source "drivers/acpi/Kconfig"
  1401. source "drivers/sfi/Kconfig"
  1402. config X86_APM_BOOT
  1403. def_bool y
  1404. depends on APM || APM_MODULE
  1405. menuconfig APM
  1406. tristate "APM (Advanced Power Management) BIOS support"
  1407. depends on X86_32 && PM_SLEEP
  1408. ---help---
  1409. APM is a BIOS specification for saving power using several different
  1410. techniques. This is mostly useful for battery powered laptops with
  1411. APM compliant BIOSes. If you say Y here, the system time will be
  1412. reset after a RESUME operation, the /proc/apm device will provide
  1413. battery status information, and user-space programs will receive
  1414. notification of APM "events" (e.g. battery status change).
  1415. If you select "Y" here, you can disable actual use of the APM
  1416. BIOS by passing the "apm=off" option to the kernel at boot time.
  1417. Note that the APM support is almost completely disabled for
  1418. machines with more than one CPU.
  1419. In order to use APM, you will need supporting software. For location
  1420. and more information, read <file:Documentation/power/pm.txt> and the
  1421. Battery Powered Linux mini-HOWTO, available from
  1422. <http://www.tldp.org/docs.html#howto>.
  1423. This driver does not spin down disk drives (see the hdparm(8)
  1424. manpage ("man 8 hdparm") for that), and it doesn't turn off
  1425. VESA-compliant "green" monitors.
  1426. This driver does not support the TI 4000M TravelMate and the ACER
  1427. 486/DX4/75 because they don't have compliant BIOSes. Many "green"
  1428. desktop machines also don't have compliant BIOSes, and this driver
  1429. may cause those machines to panic during the boot phase.
  1430. Generally, if you don't have a battery in your machine, there isn't
  1431. much point in using this driver and you should say N. If you get
  1432. random kernel OOPSes or reboots that don't seem to be related to
  1433. anything, try disabling/enabling this option (or disabling/enabling
  1434. APM in your BIOS).
  1435. Some other things you should try when experiencing seemingly random,
  1436. "weird" problems:
  1437. 1) make sure that you have enough swap space and that it is
  1438. enabled.
  1439. 2) pass the "no-hlt" option to the kernel
  1440. 3) switch on floating point emulation in the kernel and pass
  1441. the "no387" option to the kernel
  1442. 4) pass the "floppy=nodma" option to the kernel
  1443. 5) pass the "mem=4M" option to the kernel (thereby disabling
  1444. all but the first 4 MB of RAM)
  1445. 6) make sure that the CPU is not over clocked.
  1446. 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
  1447. 8) disable the cache from your BIOS settings
  1448. 9) install a fan for the video card or exchange video RAM
  1449. 10) install a better fan for the CPU
  1450. 11) exchange RAM chips
  1451. 12) exchange the motherboard.
  1452. To compile this driver as a module, choose M here: the
  1453. module will be called apm.
  1454. if APM
  1455. config APM_IGNORE_USER_SUSPEND
  1456. bool "Ignore USER SUSPEND"
  1457. ---help---
  1458. This option will ignore USER SUSPEND requests. On machines with a
  1459. compliant APM BIOS, you want to say N. However, on the NEC Versa M
  1460. series notebooks, it is necessary to say Y because of a BIOS bug.
  1461. config APM_DO_ENABLE
  1462. bool "Enable PM at boot time"
  1463. ---help---
  1464. Enable APM features at boot time. From page 36 of the APM BIOS
  1465. specification: "When disabled, the APM BIOS does not automatically
  1466. power manage devices, enter the Standby State, enter the Suspend
  1467. State, or take power saving steps in response to CPU Idle calls."
  1468. This driver will make CPU Idle calls when Linux is idle (unless this
  1469. feature is turned off -- see "Do CPU IDLE calls", below). This
  1470. should always save battery power, but more complicated APM features
  1471. will be dependent on your BIOS implementation. You may need to turn
  1472. this option off if your computer hangs at boot time when using APM
  1473. support, or if it beeps continuously instead of suspending. Turn
  1474. this off if you have a NEC UltraLite Versa 33/C or a Toshiba
  1475. T400CDT. This is off by default since most machines do fine without
  1476. this feature.
  1477. config APM_CPU_IDLE
  1478. bool "Make CPU Idle calls when idle"
  1479. ---help---
  1480. Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
  1481. On some machines, this can activate improved power savings, such as
  1482. a slowed CPU clock rate, when the machine is idle. These idle calls
  1483. are made after the idle loop has run for some length of time (e.g.,
  1484. 333 mS). On some machines, this will cause a hang at boot time or
  1485. whenever the CPU becomes idle. (On machines with more than one CPU,
  1486. this option does nothing.)
  1487. config APM_DISPLAY_BLANK
  1488. bool "Enable console blanking using APM"
  1489. ---help---
  1490. Enable console blanking using the APM. Some laptops can use this to
  1491. turn off the LCD backlight when the screen blanker of the Linux
  1492. virtual console blanks the screen. Note that this is only used by
  1493. the virtual console screen blanker, and won't turn off the backlight
  1494. when using the X Window system. This also doesn't have anything to
  1495. do with your VESA-compliant power-saving monitor. Further, this
  1496. option doesn't work for all laptops -- it might not turn off your
  1497. backlight at all, or it might print a lot of errors to the console,
  1498. especially if you are using gpm.
  1499. config APM_ALLOW_INTS
  1500. bool "Allow interrupts during APM BIOS calls"
  1501. ---help---
  1502. Normally we disable external interrupts while we are making calls to
  1503. the APM BIOS as a measure to lessen the effects of a badly behaving
  1504. BIOS implementation. The BIOS should reenable interrupts if it
  1505. needs to. Unfortunately, some BIOSes do not -- especially those in
  1506. many of the newer IBM Thinkpads. If you experience hangs when you
  1507. suspend, try setting this to Y. Otherwise, say N.
  1508. endif # APM
  1509. source "drivers/cpufreq/Kconfig"
  1510. source "drivers/cpuidle/Kconfig"
  1511. source "drivers/idle/Kconfig"
  1512. endmenu
  1513. menu "Bus options (PCI etc.)"
  1514. config PCI
  1515. bool "PCI support"
  1516. default y
  1517. select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
  1518. ---help---
  1519. Find out whether you have a PCI motherboard. PCI is the name of a
  1520. bus system, i.e. the way the CPU talks to the other stuff inside
  1521. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1522. VESA. If you have PCI, say Y, otherwise N.
  1523. choice
  1524. prompt "PCI access mode"
  1525. depends on X86_32 && PCI
  1526. default PCI_GOANY
  1527. ---help---
  1528. On PCI systems, the BIOS can be used to detect the PCI devices and
  1529. determine their configuration. However, some old PCI motherboards
  1530. have BIOS bugs and may crash if this is done. Also, some embedded
  1531. PCI-based systems don't have any BIOS at all. Linux can also try to
  1532. detect the PCI hardware directly without using the BIOS.
  1533. With this option, you can specify how Linux should detect the
  1534. PCI devices. If you choose "BIOS", the BIOS will be used,
  1535. if you choose "Direct", the BIOS won't be used, and if you
  1536. choose "MMConfig", then PCI Express MMCONFIG will be used.
  1537. If you choose "Any", the kernel will try MMCONFIG, then the
  1538. direct access method and falls back to the BIOS if that doesn't
  1539. work. If unsure, go with the default, which is "Any".
  1540. config PCI_GOBIOS
  1541. bool "BIOS"
  1542. config PCI_GOMMCONFIG
  1543. bool "MMConfig"
  1544. config PCI_GODIRECT
  1545. bool "Direct"
  1546. config PCI_GOOLPC
  1547. bool "OLPC XO-1"
  1548. depends on OLPC
  1549. config PCI_GOANY
  1550. bool "Any"
  1551. endchoice
  1552. config PCI_BIOS
  1553. def_bool y
  1554. depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
  1555. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  1556. config PCI_DIRECT
  1557. def_bool y
  1558. depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
  1559. config PCI_MMCONFIG
  1560. def_bool y
  1561. depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
  1562. config PCI_OLPC
  1563. def_bool y
  1564. depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
  1565. config PCI_XEN
  1566. def_bool y
  1567. depends on PCI && XEN
  1568. select SWIOTLB_XEN
  1569. config PCI_DOMAINS
  1570. def_bool y
  1571. depends on PCI
  1572. config PCI_MMCONFIG
  1573. bool "Support mmconfig PCI config space access"
  1574. depends on X86_64 && PCI && ACPI
  1575. config PCI_CNB20LE_QUIRK
  1576. bool "Read CNB20LE Host Bridge Windows" if EXPERT
  1577. default n
  1578. depends on PCI && EXPERIMENTAL
  1579. help
  1580. Read the PCI windows out of the CNB20LE host bridge. This allows
  1581. PCI hotplug to work on systems with the CNB20LE chipset which do
  1582. not have ACPI.
  1583. There's no public spec for this chipset, and this functionality
  1584. is known to be incomplete.
  1585. You should say N unless you know you need this.
  1586. source "drivers/pci/pcie/Kconfig"
  1587. source "drivers/pci/Kconfig"
  1588. # x86_64 have no ISA slots, but can have ISA-style DMA.
  1589. config ISA_DMA_API
  1590. bool "ISA-style DMA support" if (X86_64 && EXPERT)
  1591. default y
  1592. help
  1593. Enables ISA-style DMA support for devices requiring such controllers.
  1594. If unsure, say Y.
  1595. if X86_32
  1596. config ISA
  1597. bool "ISA support"
  1598. ---help---
  1599. Find out whether you have ISA slots on your motherboard. ISA is the
  1600. name of a bus system, i.e. the way the CPU talks to the other stuff
  1601. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1602. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1603. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1604. config EISA
  1605. bool "EISA support"
  1606. depends on ISA
  1607. ---help---
  1608. The Extended Industry Standard Architecture (EISA) bus was
  1609. developed as an open alternative to the IBM MicroChannel bus.
  1610. The EISA bus provided some of the features of the IBM MicroChannel
  1611. bus while maintaining backward compatibility with cards made for
  1612. the older ISA bus. The EISA bus saw limited use between 1988 and
  1613. 1995 when it was made obsolete by the PCI bus.
  1614. Say Y here if you are building a kernel for an EISA-based machine.
  1615. Otherwise, say N.
  1616. source "drivers/eisa/Kconfig"
  1617. config MCA
  1618. bool "MCA support"
  1619. ---help---
  1620. MicroChannel Architecture is found in some IBM PS/2 machines and
  1621. laptops. It is a bus system similar to PCI or ISA. See
  1622. <file:Documentation/mca.txt> (and especially the web page given
  1623. there) before attempting to build an MCA bus kernel.
  1624. source "drivers/mca/Kconfig"
  1625. config SCx200
  1626. tristate "NatSemi SCx200 support"
  1627. ---help---
  1628. This provides basic support for National Semiconductor's
  1629. (now AMD's) Geode processors. The driver probes for the
  1630. PCI-IDs of several on-chip devices, so its a good dependency
  1631. for other scx200_* drivers.
  1632. If compiled as a module, the driver is named scx200.
  1633. config SCx200HR_TIMER
  1634. tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
  1635. depends on SCx200
  1636. default y
  1637. ---help---
  1638. This driver provides a clocksource built upon the on-chip
  1639. 27MHz high-resolution timer. Its also a workaround for
  1640. NSC Geode SC-1100's buggy TSC, which loses time when the
  1641. processor goes idle (as is done by the scheduler). The
  1642. other workaround is idle=poll boot option.
  1643. config OLPC
  1644. bool "One Laptop Per Child support"
  1645. depends on !X86_PAE
  1646. select GPIOLIB
  1647. select OF
  1648. select OF_PROMTREE
  1649. ---help---
  1650. Add support for detecting the unique features of the OLPC
  1651. XO hardware.
  1652. config OLPC_XO1
  1653. tristate "OLPC XO-1 support"
  1654. depends on OLPC && MFD_CS5535
  1655. ---help---
  1656. Add support for non-essential features of the OLPC XO-1 laptop.
  1657. endif # X86_32
  1658. config AMD_NB
  1659. def_bool y
  1660. depends on CPU_SUP_AMD && PCI
  1661. source "drivers/pcmcia/Kconfig"
  1662. source "drivers/pci/hotplug/Kconfig"
  1663. config RAPIDIO
  1664. bool "RapidIO support"
  1665. depends on PCI
  1666. default n
  1667. help
  1668. If you say Y here, the kernel will include drivers and
  1669. infrastructure code to support RapidIO interconnect devices.
  1670. source "drivers/rapidio/Kconfig"
  1671. endmenu
  1672. menu "Executable file formats / Emulations"
  1673. source "fs/Kconfig.binfmt"
  1674. config IA32_EMULATION
  1675. bool "IA32 Emulation"
  1676. depends on X86_64
  1677. select COMPAT_BINFMT_ELF
  1678. ---help---
  1679. Include code to run 32-bit programs under a 64-bit kernel. You should
  1680. likely turn this on, unless you're 100% sure that you don't have any
  1681. 32-bit programs left.
  1682. config IA32_AOUT
  1683. tristate "IA32 a.out support"
  1684. depends on IA32_EMULATION
  1685. ---help---
  1686. Support old a.out binaries in the 32bit emulation.
  1687. config COMPAT
  1688. def_bool y
  1689. depends on IA32_EMULATION
  1690. config COMPAT_FOR_U64_ALIGNMENT
  1691. def_bool COMPAT
  1692. depends on X86_64
  1693. config SYSVIPC_COMPAT
  1694. def_bool y
  1695. depends on COMPAT && SYSVIPC
  1696. config KEYS_COMPAT
  1697. bool
  1698. depends on COMPAT && KEYS
  1699. default y
  1700. endmenu
  1701. config HAVE_ATOMIC_IOMAP
  1702. def_bool y
  1703. depends on X86_32
  1704. config HAVE_TEXT_POKE_SMP
  1705. bool
  1706. select STOP_MACHINE if SMP
  1707. source "net/Kconfig"
  1708. source "drivers/Kconfig"
  1709. source "drivers/firmware/Kconfig"
  1710. source "fs/Kconfig"
  1711. source "arch/x86/Kconfig.debug"
  1712. source "security/Kconfig"
  1713. source "crypto/Kconfig"
  1714. source "arch/x86/kvm/Kconfig"
  1715. source "lib/Kconfig"