Kconfig 65 KB

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  1. # x86 configuration
  2. mainmenu "Linux Kernel Configuration for x86"
  3. # Select 32 or 64 bit
  4. config 64BIT
  5. bool "64-bit kernel" if ARCH = "x86"
  6. default ARCH = "x86_64"
  7. ---help---
  8. Say yes to build a 64-bit kernel - formerly known as x86_64
  9. Say no to build a 32-bit kernel - formerly known as i386
  10. config X86_32
  11. def_bool !64BIT
  12. config X86_64
  13. def_bool 64BIT
  14. ### Arch settings
  15. config X86
  16. def_bool y
  17. select HAVE_AOUT if X86_32
  18. select HAVE_READQ
  19. select HAVE_WRITEQ
  20. select HAVE_UNSTABLE_SCHED_CLOCK
  21. select HAVE_IDE
  22. select HAVE_OPROFILE
  23. select HAVE_IOREMAP_PROT
  24. select HAVE_KPROBES
  25. select ARCH_WANT_OPTIONAL_GPIOLIB
  26. select ARCH_WANT_FRAME_POINTERS
  27. select HAVE_KRETPROBES
  28. select HAVE_FTRACE_MCOUNT_RECORD
  29. select HAVE_DYNAMIC_FTRACE
  30. select HAVE_FUNCTION_TRACER
  31. select HAVE_FUNCTION_GRAPH_TRACER
  32. select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  33. select HAVE_KVM
  34. select HAVE_ARCH_KGDB
  35. select HAVE_ARCH_TRACEHOOK
  36. select HAVE_GENERIC_DMA_COHERENT if X86_32
  37. select HAVE_EFFICIENT_UNALIGNED_ACCESS
  38. select USER_STACKTRACE_SUPPORT
  39. select HAVE_DMA_API_DEBUG
  40. select HAVE_KERNEL_GZIP
  41. select HAVE_KERNEL_BZIP2
  42. select HAVE_KERNEL_LZMA
  43. config ARCH_DEFCONFIG
  44. string
  45. default "arch/x86/configs/i386_defconfig" if X86_32
  46. default "arch/x86/configs/x86_64_defconfig" if X86_64
  47. config GENERIC_TIME
  48. def_bool y
  49. config GENERIC_CMOS_UPDATE
  50. def_bool y
  51. config CLOCKSOURCE_WATCHDOG
  52. def_bool y
  53. config GENERIC_CLOCKEVENTS
  54. def_bool y
  55. config GENERIC_CLOCKEVENTS_BROADCAST
  56. def_bool y
  57. depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
  58. config LOCKDEP_SUPPORT
  59. def_bool y
  60. config STACKTRACE_SUPPORT
  61. def_bool y
  62. config HAVE_LATENCYTOP_SUPPORT
  63. def_bool y
  64. config FAST_CMPXCHG_LOCAL
  65. bool
  66. default y
  67. config MMU
  68. def_bool y
  69. config ZONE_DMA
  70. def_bool y
  71. config SBUS
  72. bool
  73. config GENERIC_ISA_DMA
  74. def_bool y
  75. config GENERIC_IOMAP
  76. def_bool y
  77. config GENERIC_BUG
  78. def_bool y
  79. depends on BUG
  80. select GENERIC_BUG_RELATIVE_POINTERS if X86_64
  81. config GENERIC_BUG_RELATIVE_POINTERS
  82. bool
  83. config GENERIC_HWEIGHT
  84. def_bool y
  85. config GENERIC_GPIO
  86. bool
  87. config ARCH_MAY_HAVE_PC_FDC
  88. def_bool y
  89. config RWSEM_GENERIC_SPINLOCK
  90. def_bool !X86_XADD
  91. config RWSEM_XCHGADD_ALGORITHM
  92. def_bool X86_XADD
  93. config ARCH_HAS_CPU_IDLE_WAIT
  94. def_bool y
  95. config GENERIC_CALIBRATE_DELAY
  96. def_bool y
  97. config GENERIC_TIME_VSYSCALL
  98. bool
  99. default X86_64
  100. config ARCH_HAS_CPU_RELAX
  101. def_bool y
  102. config ARCH_HAS_DEFAULT_IDLE
  103. def_bool y
  104. config ARCH_HAS_CACHE_LINE_SIZE
  105. def_bool y
  106. config HAVE_SETUP_PER_CPU_AREA
  107. def_bool y
  108. config HAVE_DYNAMIC_PER_CPU_AREA
  109. def_bool y
  110. config HAVE_CPUMASK_OF_CPU_MAP
  111. def_bool X86_64_SMP
  112. config ARCH_HIBERNATION_POSSIBLE
  113. def_bool y
  114. config ARCH_SUSPEND_POSSIBLE
  115. def_bool y
  116. config ZONE_DMA32
  117. bool
  118. default X86_64
  119. config ARCH_POPULATES_NODE_MAP
  120. def_bool y
  121. config AUDIT_ARCH
  122. bool
  123. default X86_64
  124. config ARCH_SUPPORTS_OPTIMIZED_INLINING
  125. def_bool y
  126. config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  127. def_bool y
  128. # Use the generic interrupt handling code in kernel/irq/:
  129. config GENERIC_HARDIRQS
  130. bool
  131. default y
  132. config GENERIC_HARDIRQS_NO__DO_IRQ
  133. def_bool y
  134. config GENERIC_IRQ_PROBE
  135. bool
  136. default y
  137. config GENERIC_PENDING_IRQ
  138. bool
  139. depends on GENERIC_HARDIRQS && SMP
  140. default y
  141. config USE_GENERIC_SMP_HELPERS
  142. def_bool y
  143. depends on SMP
  144. config X86_32_SMP
  145. def_bool y
  146. depends on X86_32 && SMP
  147. config X86_64_SMP
  148. def_bool y
  149. depends on X86_64 && SMP
  150. config X86_HT
  151. bool
  152. depends on SMP
  153. default y
  154. config X86_TRAMPOLINE
  155. bool
  156. depends on SMP || (64BIT && ACPI_SLEEP)
  157. default y
  158. config X86_32_LAZY_GS
  159. def_bool y
  160. depends on X86_32 && !CC_STACKPROTECTOR
  161. config KTIME_SCALAR
  162. def_bool X86_32
  163. source "init/Kconfig"
  164. source "kernel/Kconfig.freezer"
  165. menu "Processor type and features"
  166. source "kernel/time/Kconfig"
  167. config SMP
  168. bool "Symmetric multi-processing support"
  169. ---help---
  170. This enables support for systems with more than one CPU. If you have
  171. a system with only one CPU, like most personal computers, say N. If
  172. you have a system with more than one CPU, say Y.
  173. If you say N here, the kernel will run on single and multiprocessor
  174. machines, but will use only one CPU of a multiprocessor machine. If
  175. you say Y here, the kernel will run on many, but not all,
  176. singleprocessor machines. On a singleprocessor machine, the kernel
  177. will run faster if you say N here.
  178. Note that if you say Y here and choose architecture "586" or
  179. "Pentium" under "Processor family", the kernel will not work on 486
  180. architectures. Similarly, multiprocessor kernels for the "PPro"
  181. architecture may not work on all Pentium based boards.
  182. People using multiprocessor machines who say Y here should also say
  183. Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
  184. Management" code will be disabled if you say Y here.
  185. See also <file:Documentation/i386/IO-APIC.txt>,
  186. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  187. <http://www.tldp.org/docs.html#howto>.
  188. If you don't know what to do here, say N.
  189. config X86_X2APIC
  190. bool "Support x2apic"
  191. depends on X86_LOCAL_APIC && X86_64
  192. select INTR_REMAP
  193. ---help---
  194. This enables x2apic support on CPUs that have this feature.
  195. This allows 32-bit apic IDs (so it can support very large systems),
  196. and accesses the local apic via MSRs not via mmio.
  197. ( On certain CPU models you may need to enable INTR_REMAP too,
  198. to get functional x2apic mode. )
  199. If you don't know what to do here, say N.
  200. config SPARSE_IRQ
  201. bool "Support sparse irq numbering"
  202. depends on PCI_MSI || HT_IRQ
  203. ---help---
  204. This enables support for sparse irqs. This is useful for distro
  205. kernels that want to define a high CONFIG_NR_CPUS value but still
  206. want to have low kernel memory footprint on smaller machines.
  207. ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
  208. out the irq_desc[] array in a more NUMA-friendly way. )
  209. If you don't know what to do here, say N.
  210. config NUMA_MIGRATE_IRQ_DESC
  211. bool "Move irq desc when changing irq smp_affinity"
  212. depends on SPARSE_IRQ && NUMA
  213. default n
  214. ---help---
  215. This enables moving irq_desc to cpu/node that irq will use handled.
  216. If you don't know what to do here, say N.
  217. config X86_MPPARSE
  218. bool "Enable MPS table" if ACPI
  219. default y
  220. depends on X86_LOCAL_APIC
  221. ---help---
  222. For old smp systems that do not have proper acpi support. Newer systems
  223. (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
  224. config X86_BIGSMP
  225. bool "Support for big SMP systems with more than 8 CPUs"
  226. depends on X86_32 && SMP
  227. ---help---
  228. This option is needed for the systems that have more than 8 CPUs
  229. if X86_32
  230. config X86_EXTENDED_PLATFORM
  231. bool "Support for extended (non-PC) x86 platforms"
  232. default y
  233. ---help---
  234. If you disable this option then the kernel will only support
  235. standard PC platforms. (which covers the vast majority of
  236. systems out there.)
  237. If you enable this option then you'll be able to select support
  238. for the following (non-PC) 32 bit x86 platforms:
  239. AMD Elan
  240. NUMAQ (IBM/Sequent)
  241. RDC R-321x SoC
  242. SGI 320/540 (Visual Workstation)
  243. Summit/EXA (IBM x440)
  244. Unisys ES7000 IA32 series
  245. If you have one of these systems, or if you want to build a
  246. generic distribution kernel, say Y here - otherwise say N.
  247. endif
  248. if X86_64
  249. config X86_EXTENDED_PLATFORM
  250. bool "Support for extended (non-PC) x86 platforms"
  251. default y
  252. ---help---
  253. If you disable this option then the kernel will only support
  254. standard PC platforms. (which covers the vast majority of
  255. systems out there.)
  256. If you enable this option then you'll be able to select support
  257. for the following (non-PC) 64 bit x86 platforms:
  258. ScaleMP vSMP
  259. SGI Ultraviolet
  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. # This is an alphabetically sorted list of 64 bit extended platforms
  264. # Please maintain the alphabetic order if and when there are additions
  265. config X86_VSMP
  266. bool "ScaleMP vSMP"
  267. select PARAVIRT
  268. depends on X86_64 && PCI
  269. depends on X86_EXTENDED_PLATFORM
  270. ---help---
  271. Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
  272. supposed to run on these EM64T-based machines. Only choose this option
  273. if you have one of these machines.
  274. config X86_UV
  275. bool "SGI Ultraviolet"
  276. depends on X86_64
  277. depends on X86_EXTENDED_PLATFORM
  278. select X86_X2APIC
  279. ---help---
  280. This option is needed in order to support SGI Ultraviolet systems.
  281. If you don't have one of these, you should say N here.
  282. # Following is an alphabetically sorted list of 32 bit extended platforms
  283. # Please maintain the alphabetic order if and when there are additions
  284. config X86_ELAN
  285. bool "AMD Elan"
  286. depends on X86_32
  287. depends on X86_EXTENDED_PLATFORM
  288. ---help---
  289. Select this for an AMD Elan processor.
  290. Do not use this option for K6/Athlon/Opteron processors!
  291. If unsure, choose "PC-compatible" instead.
  292. config X86_RDC321X
  293. bool "RDC R-321x SoC"
  294. depends on X86_32
  295. depends on X86_EXTENDED_PLATFORM
  296. select M486
  297. select X86_REBOOTFIXUPS
  298. ---help---
  299. This option is needed for RDC R-321x system-on-chip, also known
  300. as R-8610-(G).
  301. If you don't have one of these chips, you should say N here.
  302. config X86_32_NON_STANDARD
  303. bool "Support non-standard 32-bit SMP architectures"
  304. depends on X86_32 && SMP
  305. depends on X86_EXTENDED_PLATFORM
  306. ---help---
  307. This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
  308. subarchitectures. It is intended for a generic binary kernel.
  309. if you select them all, kernel will probe it one by one. and will
  310. fallback to default.
  311. # Alphabetically sorted list of Non standard 32 bit platforms
  312. config X86_NUMAQ
  313. bool "NUMAQ (IBM/Sequent)"
  314. depends on X86_32_NON_STANDARD
  315. select NUMA
  316. select X86_MPPARSE
  317. ---help---
  318. This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
  319. NUMA multiquad box. This changes the way that processors are
  320. bootstrapped, and uses Clustered Logical APIC addressing mode instead
  321. of Flat Logical. You will need a new lynxer.elf file to flash your
  322. firmware with - send email to <Martin.Bligh@us.ibm.com>.
  323. config X86_VISWS
  324. bool "SGI 320/540 (Visual Workstation)"
  325. depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
  326. depends on X86_32_NON_STANDARD
  327. ---help---
  328. The SGI Visual Workstation series is an IA32-based workstation
  329. based on SGI systems chips with some legacy PC hardware attached.
  330. Say Y here to create a kernel to run on the SGI 320 or 540.
  331. A kernel compiled for the Visual Workstation will run on general
  332. PCs as well. See <file:Documentation/sgi-visws.txt> for details.
  333. config X86_SUMMIT
  334. bool "Summit/EXA (IBM x440)"
  335. depends on X86_32_NON_STANDARD
  336. ---help---
  337. This option is needed for IBM systems that use the Summit/EXA chipset.
  338. In particular, it is needed for the x440.
  339. config X86_ES7000
  340. bool "Unisys ES7000 IA32 series"
  341. depends on X86_32_NON_STANDARD && X86_BIGSMP
  342. ---help---
  343. Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
  344. supposed to run on an IA32-based Unisys ES7000 system.
  345. config SCHED_OMIT_FRAME_POINTER
  346. def_bool y
  347. prompt "Single-depth WCHAN output"
  348. depends on X86
  349. ---help---
  350. Calculate simpler /proc/<PID>/wchan values. If this option
  351. is disabled then wchan values will recurse back to the
  352. caller function. This provides more accurate wchan values,
  353. at the expense of slightly more scheduling overhead.
  354. If in doubt, say "Y".
  355. menuconfig PARAVIRT_GUEST
  356. bool "Paravirtualized guest support"
  357. ---help---
  358. Say Y here to get to see options related to running Linux under
  359. various hypervisors. This option alone does not add any kernel code.
  360. If you say N, all options in this submenu will be skipped and disabled.
  361. if PARAVIRT_GUEST
  362. source "arch/x86/xen/Kconfig"
  363. config VMI
  364. bool "VMI Guest support"
  365. select PARAVIRT
  366. depends on X86_32
  367. ---help---
  368. VMI provides a paravirtualized interface to the VMware ESX server
  369. (it could be used by other hypervisors in theory too, but is not
  370. at the moment), by linking the kernel to a GPL-ed ROM module
  371. provided by the hypervisor.
  372. config KVM_CLOCK
  373. bool "KVM paravirtualized clock"
  374. select PARAVIRT
  375. select PARAVIRT_CLOCK
  376. ---help---
  377. Turning on this option will allow you to run a paravirtualized clock
  378. when running over the KVM hypervisor. Instead of relying on a PIT
  379. (or probably other) emulation by the underlying device model, the host
  380. provides the guest with timing infrastructure such as time of day, and
  381. system time
  382. config KVM_GUEST
  383. bool "KVM Guest support"
  384. select PARAVIRT
  385. ---help---
  386. This option enables various optimizations for running under the KVM
  387. hypervisor.
  388. source "arch/x86/lguest/Kconfig"
  389. config PARAVIRT
  390. bool "Enable paravirtualization code"
  391. ---help---
  392. This changes the kernel so it can modify itself when it is run
  393. under a hypervisor, potentially improving performance significantly
  394. over full virtualization. However, when run without a hypervisor
  395. the kernel is theoretically slower and slightly larger.
  396. config PARAVIRT_CLOCK
  397. bool
  398. default n
  399. endif
  400. config PARAVIRT_DEBUG
  401. bool "paravirt-ops debugging"
  402. depends on PARAVIRT && DEBUG_KERNEL
  403. ---help---
  404. Enable to debug paravirt_ops internals. Specifically, BUG if
  405. a paravirt_op is missing when it is called.
  406. config MEMTEST
  407. bool "Memtest"
  408. ---help---
  409. This option adds a kernel parameter 'memtest', which allows memtest
  410. to be set.
  411. memtest=0, mean disabled; -- default
  412. memtest=1, mean do 1 test pattern;
  413. ...
  414. memtest=4, mean do 4 test patterns.
  415. If you are unsure how to answer this question, answer N.
  416. config X86_SUMMIT_NUMA
  417. def_bool y
  418. depends on X86_32 && NUMA && X86_32_NON_STANDARD
  419. config X86_CYCLONE_TIMER
  420. def_bool y
  421. depends on X86_32_NON_STANDARD
  422. source "arch/x86/Kconfig.cpu"
  423. config HPET_TIMER
  424. def_bool X86_64
  425. prompt "HPET Timer Support" if X86_32
  426. ---help---
  427. Use the IA-PC HPET (High Precision Event Timer) to manage
  428. time in preference to the PIT and RTC, if a HPET is
  429. present.
  430. HPET is the next generation timer replacing legacy 8254s.
  431. The HPET provides a stable time base on SMP
  432. systems, unlike the TSC, but it is more expensive to access,
  433. as it is off-chip. You can find the HPET spec at
  434. <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
  435. You can safely choose Y here. However, HPET will only be
  436. activated if the platform and the BIOS support this feature.
  437. Otherwise the 8254 will be used for timing services.
  438. Choose N to continue using the legacy 8254 timer.
  439. config HPET_EMULATE_RTC
  440. def_bool y
  441. depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
  442. # Mark as embedded because too many people got it wrong.
  443. # The code disables itself when not needed.
  444. config DMI
  445. default y
  446. bool "Enable DMI scanning" if EMBEDDED
  447. ---help---
  448. Enabled scanning of DMI to identify machine quirks. Say Y
  449. here unless you have verified that your setup is not
  450. affected by entries in the DMI blacklist. Required by PNP
  451. BIOS code.
  452. config GART_IOMMU
  453. bool "GART IOMMU support" if EMBEDDED
  454. default y
  455. select SWIOTLB
  456. select AGP
  457. depends on X86_64 && PCI
  458. ---help---
  459. Support for full DMA access of devices with 32bit memory access only
  460. on systems with more than 3GB. This is usually needed for USB,
  461. sound, many IDE/SATA chipsets and some other devices.
  462. Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
  463. based hardware IOMMU and a software bounce buffer based IOMMU used
  464. on Intel systems and as fallback.
  465. The code is only active when needed (enough memory and limited
  466. device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
  467. too.
  468. config CALGARY_IOMMU
  469. bool "IBM Calgary IOMMU support"
  470. select SWIOTLB
  471. depends on X86_64 && PCI && EXPERIMENTAL
  472. ---help---
  473. Support for hardware IOMMUs in IBM's xSeries x366 and x460
  474. systems. Needed to run systems with more than 3GB of memory
  475. properly with 32-bit PCI devices that do not support DAC
  476. (Double Address Cycle). Calgary also supports bus level
  477. isolation, where all DMAs pass through the IOMMU. This
  478. prevents them from going anywhere except their intended
  479. destination. This catches hard-to-find kernel bugs and
  480. mis-behaving drivers and devices that do not use the DMA-API
  481. properly to set up their DMA buffers. The IOMMU can be
  482. turned off at boot time with the iommu=off parameter.
  483. Normally the kernel will make the right choice by itself.
  484. If unsure, say Y.
  485. config CALGARY_IOMMU_ENABLED_BY_DEFAULT
  486. def_bool y
  487. prompt "Should Calgary be enabled by default?"
  488. depends on CALGARY_IOMMU
  489. ---help---
  490. Should Calgary be enabled by default? if you choose 'y', Calgary
  491. will be used (if it exists). If you choose 'n', Calgary will not be
  492. used even if it exists. If you choose 'n' and would like to use
  493. Calgary anyway, pass 'iommu=calgary' on the kernel command line.
  494. If unsure, say Y.
  495. config AMD_IOMMU
  496. bool "AMD IOMMU support"
  497. select SWIOTLB
  498. select PCI_MSI
  499. depends on X86_64 && PCI && ACPI
  500. ---help---
  501. With this option you can enable support for AMD IOMMU hardware in
  502. your system. An IOMMU is a hardware component which provides
  503. remapping of DMA memory accesses from devices. With an AMD IOMMU you
  504. can isolate the the DMA memory of different devices and protect the
  505. system from misbehaving device drivers or hardware.
  506. You can find out if your system has an AMD IOMMU if you look into
  507. your BIOS for an option to enable it or if you have an IVRS ACPI
  508. table.
  509. config AMD_IOMMU_STATS
  510. bool "Export AMD IOMMU statistics to debugfs"
  511. depends on AMD_IOMMU
  512. select DEBUG_FS
  513. ---help---
  514. This option enables code in the AMD IOMMU driver to collect various
  515. statistics about whats happening in the driver and exports that
  516. information to userspace via debugfs.
  517. If unsure, say N.
  518. # need this always selected by IOMMU for the VIA workaround
  519. config SWIOTLB
  520. def_bool y if X86_64
  521. ---help---
  522. Support for software bounce buffers used on x86-64 systems
  523. which don't have a hardware IOMMU (e.g. the current generation
  524. of Intel's x86-64 CPUs). Using this PCI devices which can only
  525. access 32-bits of memory can be used on systems with more than
  526. 3 GB of memory. If unsure, say Y.
  527. config IOMMU_HELPER
  528. def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
  529. config IOMMU_API
  530. def_bool (AMD_IOMMU || DMAR)
  531. config MAXSMP
  532. bool "Configure Maximum number of SMP Processors and NUMA Nodes"
  533. depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
  534. select CPUMASK_OFFSTACK
  535. default n
  536. ---help---
  537. Configure maximum number of CPUS and NUMA Nodes for this architecture.
  538. If unsure, say N.
  539. config NR_CPUS
  540. int "Maximum number of CPUs" if SMP && !MAXSMP
  541. range 2 512 if SMP && !MAXSMP
  542. default "1" if !SMP
  543. default "4096" if MAXSMP
  544. default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
  545. default "8" if SMP
  546. ---help---
  547. This allows you to specify the maximum number of CPUs which this
  548. kernel will support. The maximum supported value is 512 and the
  549. minimum value which makes sense is 2.
  550. This is purely to save memory - each supported CPU adds
  551. approximately eight kilobytes to the kernel image.
  552. config SCHED_SMT
  553. bool "SMT (Hyperthreading) scheduler support"
  554. depends on X86_HT
  555. ---help---
  556. SMT scheduler support improves the CPU scheduler's decision making
  557. when dealing with Intel Pentium 4 chips with HyperThreading at a
  558. cost of slightly increased overhead in some places. If unsure say
  559. N here.
  560. config SCHED_MC
  561. def_bool y
  562. prompt "Multi-core scheduler support"
  563. depends on X86_HT
  564. ---help---
  565. Multi-core scheduler support improves the CPU scheduler's decision
  566. making when dealing with multi-core CPU chips at a cost of slightly
  567. increased overhead in some places. If unsure say N here.
  568. source "kernel/Kconfig.preempt"
  569. config X86_UP_APIC
  570. bool "Local APIC support on uniprocessors"
  571. depends on X86_32 && !SMP && !X86_32_NON_STANDARD
  572. ---help---
  573. A local APIC (Advanced Programmable Interrupt Controller) is an
  574. integrated interrupt controller in the CPU. If you have a single-CPU
  575. system which has a processor with a local APIC, you can say Y here to
  576. enable and use it. If you say Y here even though your machine doesn't
  577. have a local APIC, then the kernel will still run with no slowdown at
  578. all. The local APIC supports CPU-generated self-interrupts (timer,
  579. performance counters), and the NMI watchdog which detects hard
  580. lockups.
  581. config X86_UP_IOAPIC
  582. bool "IO-APIC support on uniprocessors"
  583. depends on X86_UP_APIC
  584. ---help---
  585. An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
  586. SMP-capable replacement for PC-style interrupt controllers. Most
  587. SMP systems and many recent uniprocessor systems have one.
  588. If you have a single-CPU system with an IO-APIC, you can say Y here
  589. to use it. If you say Y here even though your machine doesn't have
  590. an IO-APIC, then the kernel will still run with no slowdown at all.
  591. config X86_LOCAL_APIC
  592. def_bool y
  593. depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
  594. config X86_IO_APIC
  595. def_bool y
  596. depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
  597. config X86_VISWS_APIC
  598. def_bool y
  599. depends on X86_32 && X86_VISWS
  600. config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
  601. bool "Reroute for broken boot IRQs"
  602. default n
  603. depends on X86_IO_APIC
  604. ---help---
  605. This option enables a workaround that fixes a source of
  606. spurious interrupts. This is recommended when threaded
  607. interrupt handling is used on systems where the generation of
  608. superfluous "boot interrupts" cannot be disabled.
  609. Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
  610. entry in the chipset's IO-APIC is masked (as, e.g. the RT
  611. kernel does during interrupt handling). On chipsets where this
  612. boot IRQ generation cannot be disabled, this workaround keeps
  613. the original IRQ line masked so that only the equivalent "boot
  614. IRQ" is delivered to the CPUs. The workaround also tells the
  615. kernel to set up the IRQ handler on the boot IRQ line. In this
  616. way only one interrupt is delivered to the kernel. Otherwise
  617. the spurious second interrupt may cause the kernel to bring
  618. down (vital) interrupt lines.
  619. Only affects "broken" chipsets. Interrupt sharing may be
  620. increased on these systems.
  621. config X86_MCE
  622. bool "Machine Check Exception"
  623. ---help---
  624. Machine Check Exception support allows the processor to notify the
  625. kernel if it detects a problem (e.g. overheating, component failure).
  626. The action the kernel takes depends on the severity of the problem,
  627. ranging from a warning message on the console, to halting the machine.
  628. Your processor must be a Pentium or newer to support this - check the
  629. flags in /proc/cpuinfo for mce. Note that some older Pentium systems
  630. have a design flaw which leads to false MCE events - hence MCE is
  631. disabled on all P5 processors, unless explicitly enabled with "mce"
  632. as a boot argument. Similarly, if MCE is built in and creates a
  633. problem on some new non-standard machine, you can boot with "nomce"
  634. to disable it. MCE support simply ignores non-MCE processors like
  635. the 386 and 486, so nearly everyone can say Y here.
  636. config X86_MCE_INTEL
  637. def_bool y
  638. prompt "Intel MCE features"
  639. depends on X86_64 && X86_MCE && X86_LOCAL_APIC
  640. ---help---
  641. Additional support for intel specific MCE features such as
  642. the thermal monitor.
  643. config X86_MCE_AMD
  644. def_bool y
  645. prompt "AMD MCE features"
  646. depends on X86_64 && X86_MCE && X86_LOCAL_APIC
  647. ---help---
  648. Additional support for AMD specific MCE features such as
  649. the DRAM Error Threshold.
  650. config X86_MCE_THRESHOLD
  651. depends on X86_MCE_AMD || X86_MCE_INTEL
  652. bool
  653. default y
  654. config X86_MCE_NONFATAL
  655. tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
  656. depends on X86_32 && X86_MCE
  657. ---help---
  658. Enabling this feature starts a timer that triggers every 5 seconds which
  659. will look at the machine check registers to see if anything happened.
  660. Non-fatal problems automatically get corrected (but still logged).
  661. Disable this if you don't want to see these messages.
  662. Seeing the messages this option prints out may be indicative of dying
  663. or out-of-spec (ie, overclocked) hardware.
  664. This option only does something on certain CPUs.
  665. (AMD Athlon/Duron and Intel Pentium 4)
  666. config X86_MCE_P4THERMAL
  667. bool "check for P4 thermal throttling interrupt."
  668. depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP)
  669. ---help---
  670. Enabling this feature will cause a message to be printed when the P4
  671. enters thermal throttling.
  672. config VM86
  673. bool "Enable VM86 support" if EMBEDDED
  674. default y
  675. depends on X86_32
  676. ---help---
  677. This option is required by programs like DOSEMU to run 16-bit legacy
  678. code on X86 processors. It also may be needed by software like
  679. XFree86 to initialize some video cards via BIOS. Disabling this
  680. option saves about 6k.
  681. config TOSHIBA
  682. tristate "Toshiba Laptop support"
  683. depends on X86_32
  684. ---help---
  685. This adds a driver to safely access the System Management Mode of
  686. the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
  687. not work on models with a Phoenix BIOS. The System Management Mode
  688. is used to set the BIOS and power saving options on Toshiba portables.
  689. For information on utilities to make use of this driver see the
  690. Toshiba Linux utilities web site at:
  691. <http://www.buzzard.org.uk/toshiba/>.
  692. Say Y if you intend to run this kernel on a Toshiba portable.
  693. Say N otherwise.
  694. config I8K
  695. tristate "Dell laptop support"
  696. ---help---
  697. This adds a driver to safely access the System Management Mode
  698. of the CPU on the Dell Inspiron 8000. The System Management Mode
  699. is used to read cpu temperature and cooling fan status and to
  700. control the fans on the I8K portables.
  701. This driver has been tested only on the Inspiron 8000 but it may
  702. also work with other Dell laptops. You can force loading on other
  703. models by passing the parameter `force=1' to the module. Use at
  704. your own risk.
  705. For information on utilities to make use of this driver see the
  706. I8K Linux utilities web site at:
  707. <http://people.debian.org/~dz/i8k/>
  708. Say Y if you intend to run this kernel on a Dell Inspiron 8000.
  709. Say N otherwise.
  710. config X86_REBOOTFIXUPS
  711. bool "Enable X86 board specific fixups for reboot"
  712. depends on X86_32
  713. ---help---
  714. This enables chipset and/or board specific fixups to be done
  715. in order to get reboot to work correctly. This is only needed on
  716. some combinations of hardware and BIOS. The symptom, for which
  717. this config is intended, is when reboot ends with a stalled/hung
  718. system.
  719. Currently, the only fixup is for the Geode machines using
  720. CS5530A and CS5536 chipsets and the RDC R-321x SoC.
  721. Say Y if you want to enable the fixup. Currently, it's safe to
  722. enable this option even if you don't need it.
  723. Say N otherwise.
  724. config MICROCODE
  725. tristate "/dev/cpu/microcode - microcode support"
  726. select FW_LOADER
  727. ---help---
  728. If you say Y here, you will be able to update the microcode on
  729. certain Intel and AMD processors. The Intel support is for the
  730. IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
  731. Pentium 4, Xeon etc. The AMD support is for family 0x10 and
  732. 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
  733. You will obviously need the actual microcode binary data itself
  734. which is not shipped with the Linux kernel.
  735. This option selects the general module only, you need to select
  736. at least one vendor specific module as well.
  737. To compile this driver as a module, choose M here: the
  738. module will be called microcode.
  739. config MICROCODE_INTEL
  740. bool "Intel microcode patch loading support"
  741. depends on MICROCODE
  742. default MICROCODE
  743. select FW_LOADER
  744. ---help---
  745. This options enables microcode patch loading support for Intel
  746. processors.
  747. For latest news and information on obtaining all the required
  748. Intel ingredients for this driver, check:
  749. <http://www.urbanmyth.org/microcode/>.
  750. config MICROCODE_AMD
  751. bool "AMD microcode patch loading support"
  752. depends on MICROCODE
  753. select FW_LOADER
  754. ---help---
  755. If you select this option, microcode patch loading support for AMD
  756. processors will be enabled.
  757. config MICROCODE_OLD_INTERFACE
  758. def_bool y
  759. depends on MICROCODE
  760. config X86_MSR
  761. tristate "/dev/cpu/*/msr - Model-specific register support"
  762. ---help---
  763. This device gives privileged processes access to the x86
  764. Model-Specific Registers (MSRs). It is a character device with
  765. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  766. MSR accesses are directed to a specific CPU on multi-processor
  767. systems.
  768. config X86_CPUID
  769. tristate "/dev/cpu/*/cpuid - CPU information support"
  770. ---help---
  771. This device gives processes access to the x86 CPUID instruction to
  772. be executed on a specific processor. It is a character device
  773. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  774. /dev/cpu/31/cpuid.
  775. config X86_CPU_DEBUG
  776. tristate "/sys/kernel/debug/x86/cpu/* - CPU Debug support"
  777. ---help---
  778. If you select this option, this will provide various x86 CPUs
  779. information through debugfs.
  780. choice
  781. prompt "High Memory Support"
  782. default HIGHMEM4G if !X86_NUMAQ
  783. default HIGHMEM64G if X86_NUMAQ
  784. depends on X86_32
  785. config NOHIGHMEM
  786. bool "off"
  787. depends on !X86_NUMAQ
  788. ---help---
  789. Linux can use up to 64 Gigabytes of physical memory on x86 systems.
  790. However, the address space of 32-bit x86 processors is only 4
  791. Gigabytes large. That means that, if you have a large amount of
  792. physical memory, not all of it can be "permanently mapped" by the
  793. kernel. The physical memory that's not permanently mapped is called
  794. "high memory".
  795. If you are compiling a kernel which will never run on a machine with
  796. more than 1 Gigabyte total physical RAM, answer "off" here (default
  797. choice and suitable for most users). This will result in a "3GB/1GB"
  798. split: 3GB are mapped so that each process sees a 3GB virtual memory
  799. space and the remaining part of the 4GB virtual memory space is used
  800. by the kernel to permanently map as much physical memory as
  801. possible.
  802. If the machine has between 1 and 4 Gigabytes physical RAM, then
  803. answer "4GB" here.
  804. If more than 4 Gigabytes is used then answer "64GB" here. This
  805. selection turns Intel PAE (Physical Address Extension) mode on.
  806. PAE implements 3-level paging on IA32 processors. PAE is fully
  807. supported by Linux, PAE mode is implemented on all recent Intel
  808. processors (Pentium Pro and better). NOTE: If you say "64GB" here,
  809. then the kernel will not boot on CPUs that don't support PAE!
  810. The actual amount of total physical memory will either be
  811. auto detected or can be forced by using a kernel command line option
  812. such as "mem=256M". (Try "man bootparam" or see the documentation of
  813. your boot loader (lilo or loadlin) about how to pass options to the
  814. kernel at boot time.)
  815. If unsure, say "off".
  816. config HIGHMEM4G
  817. bool "4GB"
  818. depends on !X86_NUMAQ
  819. ---help---
  820. Select this if you have a 32-bit processor and between 1 and 4
  821. gigabytes of physical RAM.
  822. config HIGHMEM64G
  823. bool "64GB"
  824. depends on !M386 && !M486
  825. select X86_PAE
  826. ---help---
  827. Select this if you have a 32-bit processor and more than 4
  828. gigabytes of physical RAM.
  829. endchoice
  830. choice
  831. depends on EXPERIMENTAL
  832. prompt "Memory split" if EMBEDDED
  833. default VMSPLIT_3G
  834. depends on X86_32
  835. ---help---
  836. Select the desired split between kernel and user memory.
  837. If the address range available to the kernel is less than the
  838. physical memory installed, the remaining memory will be available
  839. as "high memory". Accessing high memory is a little more costly
  840. than low memory, as it needs to be mapped into the kernel first.
  841. Note that increasing the kernel address space limits the range
  842. available to user programs, making the address space there
  843. tighter. Selecting anything other than the default 3G/1G split
  844. will also likely make your kernel incompatible with binary-only
  845. kernel modules.
  846. If you are not absolutely sure what you are doing, leave this
  847. option alone!
  848. config VMSPLIT_3G
  849. bool "3G/1G user/kernel split"
  850. config VMSPLIT_3G_OPT
  851. depends on !X86_PAE
  852. bool "3G/1G user/kernel split (for full 1G low memory)"
  853. config VMSPLIT_2G
  854. bool "2G/2G user/kernel split"
  855. config VMSPLIT_2G_OPT
  856. depends on !X86_PAE
  857. bool "2G/2G user/kernel split (for full 2G low memory)"
  858. config VMSPLIT_1G
  859. bool "1G/3G user/kernel split"
  860. endchoice
  861. config PAGE_OFFSET
  862. hex
  863. default 0xB0000000 if VMSPLIT_3G_OPT
  864. default 0x80000000 if VMSPLIT_2G
  865. default 0x78000000 if VMSPLIT_2G_OPT
  866. default 0x40000000 if VMSPLIT_1G
  867. default 0xC0000000
  868. depends on X86_32
  869. config HIGHMEM
  870. def_bool y
  871. depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
  872. config X86_PAE
  873. bool "PAE (Physical Address Extension) Support"
  874. depends on X86_32 && !HIGHMEM4G
  875. ---help---
  876. PAE is required for NX support, and furthermore enables
  877. larger swapspace support for non-overcommit purposes. It
  878. has the cost of more pagetable lookup overhead, and also
  879. consumes more pagetable space per process.
  880. config ARCH_PHYS_ADDR_T_64BIT
  881. def_bool X86_64 || X86_PAE
  882. config DIRECT_GBPAGES
  883. bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
  884. default y
  885. depends on X86_64
  886. ---help---
  887. Allow the kernel linear mapping to use 1GB pages on CPUs that
  888. support it. This can improve the kernel's performance a tiny bit by
  889. reducing TLB pressure. If in doubt, say "Y".
  890. # Common NUMA Features
  891. config NUMA
  892. bool "Numa Memory Allocation and Scheduler Support"
  893. depends on SMP
  894. depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
  895. default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
  896. ---help---
  897. Enable NUMA (Non Uniform Memory Access) support.
  898. The kernel will try to allocate memory used by a CPU on the
  899. local memory controller of the CPU and add some more
  900. NUMA awareness to the kernel.
  901. For 64-bit this is recommended if the system is Intel Core i7
  902. (or later), AMD Opteron, or EM64T NUMA.
  903. For 32-bit this is only needed on (rare) 32-bit-only platforms
  904. that support NUMA topologies, such as NUMAQ / Summit, or if you
  905. boot a 32-bit kernel on a 64-bit NUMA platform.
  906. Otherwise, you should say N.
  907. comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
  908. depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
  909. config K8_NUMA
  910. def_bool y
  911. prompt "Old style AMD Opteron NUMA detection"
  912. depends on X86_64 && NUMA && PCI
  913. ---help---
  914. Enable K8 NUMA node topology detection. You should say Y here if
  915. you have a multi processor AMD K8 system. This uses an old
  916. method to read the NUMA configuration directly from the builtin
  917. Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
  918. instead, which also takes priority if both are compiled in.
  919. config X86_64_ACPI_NUMA
  920. def_bool y
  921. prompt "ACPI NUMA detection"
  922. depends on X86_64 && NUMA && ACPI && PCI
  923. select ACPI_NUMA
  924. ---help---
  925. Enable ACPI SRAT based node topology detection.
  926. # Some NUMA nodes have memory ranges that span
  927. # other nodes. Even though a pfn is valid and
  928. # between a node's start and end pfns, it may not
  929. # reside on that node. See memmap_init_zone()
  930. # for details.
  931. config NODES_SPAN_OTHER_NODES
  932. def_bool y
  933. depends on X86_64_ACPI_NUMA
  934. config NUMA_EMU
  935. bool "NUMA emulation"
  936. depends on X86_64 && NUMA
  937. ---help---
  938. Enable NUMA emulation. A flat machine will be split
  939. into virtual nodes when booted with "numa=fake=N", where N is the
  940. number of nodes. This is only useful for debugging.
  941. config NODES_SHIFT
  942. int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
  943. range 1 9
  944. default "9" if MAXSMP
  945. default "6" if X86_64
  946. default "4" if X86_NUMAQ
  947. default "3"
  948. depends on NEED_MULTIPLE_NODES
  949. ---help---
  950. Specify the maximum number of NUMA Nodes available on the target
  951. system. Increases memory reserved to accomodate various tables.
  952. config HAVE_ARCH_BOOTMEM
  953. def_bool y
  954. depends on X86_32 && NUMA
  955. config ARCH_HAVE_MEMORY_PRESENT
  956. def_bool y
  957. depends on X86_32 && DISCONTIGMEM
  958. config NEED_NODE_MEMMAP_SIZE
  959. def_bool y
  960. depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
  961. config HAVE_ARCH_ALLOC_REMAP
  962. def_bool y
  963. depends on X86_32 && NUMA
  964. config ARCH_FLATMEM_ENABLE
  965. def_bool y
  966. depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
  967. config ARCH_DISCONTIGMEM_ENABLE
  968. def_bool y
  969. depends on NUMA && X86_32
  970. config ARCH_DISCONTIGMEM_DEFAULT
  971. def_bool y
  972. depends on NUMA && X86_32
  973. config ARCH_SPARSEMEM_DEFAULT
  974. def_bool y
  975. depends on X86_64
  976. config ARCH_SPARSEMEM_ENABLE
  977. def_bool y
  978. depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
  979. select SPARSEMEM_STATIC if X86_32
  980. select SPARSEMEM_VMEMMAP_ENABLE if X86_64
  981. config ARCH_SELECT_MEMORY_MODEL
  982. def_bool y
  983. depends on ARCH_SPARSEMEM_ENABLE
  984. config ARCH_MEMORY_PROBE
  985. def_bool X86_64
  986. depends on MEMORY_HOTPLUG
  987. source "mm/Kconfig"
  988. config HIGHPTE
  989. bool "Allocate 3rd-level pagetables from highmem"
  990. depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
  991. ---help---
  992. The VM uses one page table entry for each page of physical memory.
  993. For systems with a lot of RAM, this can be wasteful of precious
  994. low memory. Setting this option will put user-space page table
  995. entries in high memory.
  996. config X86_CHECK_BIOS_CORRUPTION
  997. bool "Check for low memory corruption"
  998. ---help---
  999. Periodically check for memory corruption in low memory, which
  1000. is suspected to be caused by BIOS. Even when enabled in the
  1001. configuration, it is disabled at runtime. Enable it by
  1002. setting "memory_corruption_check=1" on the kernel command
  1003. line. By default it scans the low 64k of memory every 60
  1004. seconds; see the memory_corruption_check_size and
  1005. memory_corruption_check_period parameters in
  1006. Documentation/kernel-parameters.txt to adjust this.
  1007. When enabled with the default parameters, this option has
  1008. almost no overhead, as it reserves a relatively small amount
  1009. of memory and scans it infrequently. It both detects corruption
  1010. and prevents it from affecting the running system.
  1011. It is, however, intended as a diagnostic tool; if repeatable
  1012. BIOS-originated corruption always affects the same memory,
  1013. you can use memmap= to prevent the kernel from using that
  1014. memory.
  1015. config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
  1016. bool "Set the default setting of memory_corruption_check"
  1017. depends on X86_CHECK_BIOS_CORRUPTION
  1018. default y
  1019. ---help---
  1020. Set whether the default state of memory_corruption_check is
  1021. on or off.
  1022. config X86_RESERVE_LOW_64K
  1023. bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
  1024. default y
  1025. ---help---
  1026. Reserve the first 64K of physical RAM on BIOSes that are known
  1027. to potentially corrupt that memory range. A numbers of BIOSes are
  1028. known to utilize this area during suspend/resume, so it must not
  1029. be used by the kernel.
  1030. Set this to N if you are absolutely sure that you trust the BIOS
  1031. to get all its memory reservations and usages right.
  1032. If you have doubts about the BIOS (e.g. suspend/resume does not
  1033. work or there's kernel crashes after certain hardware hotplug
  1034. events) and it's not AMI or Phoenix, then you might want to enable
  1035. X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
  1036. corruption patterns.
  1037. Say Y if unsure.
  1038. config MATH_EMULATION
  1039. bool
  1040. prompt "Math emulation" if X86_32
  1041. ---help---
  1042. Linux can emulate a math coprocessor (used for floating point
  1043. operations) if you don't have one. 486DX and Pentium processors have
  1044. a math coprocessor built in, 486SX and 386 do not, unless you added
  1045. a 487DX or 387, respectively. (The messages during boot time can
  1046. give you some hints here ["man dmesg"].) Everyone needs either a
  1047. coprocessor or this emulation.
  1048. If you don't have a math coprocessor, you need to say Y here; if you
  1049. say Y here even though you have a coprocessor, the coprocessor will
  1050. be used nevertheless. (This behavior can be changed with the kernel
  1051. command line option "no387", which comes handy if your coprocessor
  1052. is broken. Try "man bootparam" or see the documentation of your boot
  1053. loader (lilo or loadlin) about how to pass options to the kernel at
  1054. boot time.) This means that it is a good idea to say Y here if you
  1055. intend to use this kernel on different machines.
  1056. More information about the internals of the Linux math coprocessor
  1057. emulation can be found in <file:arch/x86/math-emu/README>.
  1058. If you are not sure, say Y; apart from resulting in a 66 KB bigger
  1059. kernel, it won't hurt.
  1060. config MTRR
  1061. bool "MTRR (Memory Type Range Register) support"
  1062. ---help---
  1063. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  1064. the Memory Type Range Registers (MTRRs) may be used to control
  1065. processor access to memory ranges. This is most useful if you have
  1066. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  1067. allows bus write transfers to be combined into a larger transfer
  1068. before bursting over the PCI/AGP bus. This can increase performance
  1069. of image write operations 2.5 times or more. Saying Y here creates a
  1070. /proc/mtrr file which may be used to manipulate your processor's
  1071. MTRRs. Typically the X server should use this.
  1072. This code has a reasonably generic interface so that similar
  1073. control registers on other processors can be easily supported
  1074. as well:
  1075. The Cyrix 6x86, 6x86MX and M II processors have Address Range
  1076. Registers (ARRs) which provide a similar functionality to MTRRs. For
  1077. these, the ARRs are used to emulate the MTRRs.
  1078. The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
  1079. MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
  1080. write-combining. All of these processors are supported by this code
  1081. and it makes sense to say Y here if you have one of them.
  1082. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  1083. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  1084. can lead to all sorts of problems, so it's good to say Y here.
  1085. You can safely say Y even if your machine doesn't have MTRRs, you'll
  1086. just add about 9 KB to your kernel.
  1087. See <file:Documentation/x86/mtrr.txt> for more information.
  1088. config MTRR_SANITIZER
  1089. def_bool y
  1090. prompt "MTRR cleanup support"
  1091. depends on MTRR
  1092. ---help---
  1093. Convert MTRR layout from continuous to discrete, so X drivers can
  1094. add writeback entries.
  1095. Can be disabled with disable_mtrr_cleanup on the kernel command line.
  1096. The largest mtrr entry size for a continous block can be set with
  1097. mtrr_chunk_size.
  1098. If unsure, say Y.
  1099. config MTRR_SANITIZER_ENABLE_DEFAULT
  1100. int "MTRR cleanup enable value (0-1)"
  1101. range 0 1
  1102. default "0"
  1103. depends on MTRR_SANITIZER
  1104. ---help---
  1105. Enable mtrr cleanup default value
  1106. config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
  1107. int "MTRR cleanup spare reg num (0-7)"
  1108. range 0 7
  1109. default "1"
  1110. depends on MTRR_SANITIZER
  1111. ---help---
  1112. mtrr cleanup spare entries default, it can be changed via
  1113. mtrr_spare_reg_nr=N on the kernel command line.
  1114. config X86_PAT
  1115. bool
  1116. prompt "x86 PAT support"
  1117. depends on MTRR
  1118. ---help---
  1119. Use PAT attributes to setup page level cache control.
  1120. PATs are the modern equivalents of MTRRs and are much more
  1121. flexible than MTRRs.
  1122. Say N here if you see bootup problems (boot crash, boot hang,
  1123. spontaneous reboots) or a non-working video driver.
  1124. If unsure, say Y.
  1125. config EFI
  1126. bool "EFI runtime service support"
  1127. depends on ACPI
  1128. ---help---
  1129. This enables the kernel to use EFI runtime services that are
  1130. available (such as the EFI variable services).
  1131. This option is only useful on systems that have EFI firmware.
  1132. In addition, you should use the latest ELILO loader available
  1133. at <http://elilo.sourceforge.net> in order to take advantage
  1134. of EFI runtime services. However, even with this option, the
  1135. resultant kernel should continue to boot on existing non-EFI
  1136. platforms.
  1137. config SECCOMP
  1138. def_bool y
  1139. prompt "Enable seccomp to safely compute untrusted bytecode"
  1140. ---help---
  1141. This kernel feature is useful for number crunching applications
  1142. that may need to compute untrusted bytecode during their
  1143. execution. By using pipes or other transports made available to
  1144. the process as file descriptors supporting the read/write
  1145. syscalls, it's possible to isolate those applications in
  1146. their own address space using seccomp. Once seccomp is
  1147. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1148. and the task is only allowed to execute a few safe syscalls
  1149. defined by each seccomp mode.
  1150. If unsure, say Y. Only embedded should say N here.
  1151. config CC_STACKPROTECTOR_ALL
  1152. bool
  1153. config CC_STACKPROTECTOR
  1154. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1155. select CC_STACKPROTECTOR_ALL
  1156. ---help---
  1157. This option turns on the -fstack-protector GCC feature. This
  1158. feature puts, at the beginning of functions, a canary value on
  1159. the stack just before the return address, and validates
  1160. the value just before actually returning. Stack based buffer
  1161. overflows (that need to overwrite this return address) now also
  1162. overwrite the canary, which gets detected and the attack is then
  1163. neutralized via a kernel panic.
  1164. This feature requires gcc version 4.2 or above, or a distribution
  1165. gcc with the feature backported. Older versions are automatically
  1166. detected and for those versions, this configuration option is
  1167. ignored. (and a warning is printed during bootup)
  1168. source kernel/Kconfig.hz
  1169. config KEXEC
  1170. bool "kexec system call"
  1171. ---help---
  1172. kexec is a system call that implements the ability to shutdown your
  1173. current kernel, and to start another kernel. It is like a reboot
  1174. but it is independent of the system firmware. And like a reboot
  1175. you can start any kernel with it, not just Linux.
  1176. The name comes from the similarity to the exec system call.
  1177. It is an ongoing process to be certain the hardware in a machine
  1178. is properly shutdown, so do not be surprised if this code does not
  1179. initially work for you. It may help to enable device hotplugging
  1180. support. As of this writing the exact hardware interface is
  1181. strongly in flux, so no good recommendation can be made.
  1182. config CRASH_DUMP
  1183. bool "kernel crash dumps"
  1184. depends on X86_64 || (X86_32 && HIGHMEM)
  1185. ---help---
  1186. Generate crash dump after being started by kexec.
  1187. This should be normally only set in special crash dump kernels
  1188. which are loaded in the main kernel with kexec-tools into
  1189. a specially reserved region and then later executed after
  1190. a crash by kdump/kexec. The crash dump kernel must be compiled
  1191. to a memory address not used by the main kernel or BIOS using
  1192. PHYSICAL_START, or it must be built as a relocatable image
  1193. (CONFIG_RELOCATABLE=y).
  1194. For more details see Documentation/kdump/kdump.txt
  1195. config KEXEC_JUMP
  1196. bool "kexec jump (EXPERIMENTAL)"
  1197. depends on EXPERIMENTAL
  1198. depends on KEXEC && HIBERNATION
  1199. ---help---
  1200. Jump between original kernel and kexeced kernel and invoke
  1201. code in physical address mode via KEXEC
  1202. config PHYSICAL_START
  1203. hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
  1204. default "0x1000000" if X86_NUMAQ
  1205. default "0x200000" if X86_64
  1206. default "0x100000"
  1207. ---help---
  1208. This gives the physical address where the kernel is loaded.
  1209. If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
  1210. bzImage will decompress itself to above physical address and
  1211. run from there. Otherwise, bzImage will run from the address where
  1212. it has been loaded by the boot loader and will ignore above physical
  1213. address.
  1214. In normal kdump cases one does not have to set/change this option
  1215. as now bzImage can be compiled as a completely relocatable image
  1216. (CONFIG_RELOCATABLE=y) and be used to load and run from a different
  1217. address. This option is mainly useful for the folks who don't want
  1218. to use a bzImage for capturing the crash dump and want to use a
  1219. vmlinux instead. vmlinux is not relocatable hence a kernel needs
  1220. to be specifically compiled to run from a specific memory area
  1221. (normally a reserved region) and this option comes handy.
  1222. So if you are using bzImage for capturing the crash dump, leave
  1223. the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
  1224. Otherwise if you plan to use vmlinux for capturing the crash dump
  1225. change this value to start of the reserved region (Typically 16MB
  1226. 0x1000000). In other words, it can be set based on the "X" value as
  1227. specified in the "crashkernel=YM@XM" command line boot parameter
  1228. passed to the panic-ed kernel. Typically this parameter is set as
  1229. crashkernel=64M@16M. Please take a look at
  1230. Documentation/kdump/kdump.txt for more details about crash dumps.
  1231. Usage of bzImage for capturing the crash dump is recommended as
  1232. one does not have to build two kernels. Same kernel can be used
  1233. as production kernel and capture kernel. Above option should have
  1234. gone away after relocatable bzImage support is introduced. But it
  1235. is present because there are users out there who continue to use
  1236. vmlinux for dump capture. This option should go away down the
  1237. line.
  1238. Don't change this unless you know what you are doing.
  1239. config RELOCATABLE
  1240. bool "Build a relocatable kernel (EXPERIMENTAL)"
  1241. depends on EXPERIMENTAL
  1242. ---help---
  1243. This builds a kernel image that retains relocation information
  1244. so it can be loaded someplace besides the default 1MB.
  1245. The relocations tend to make the kernel binary about 10% larger,
  1246. but are discarded at runtime.
  1247. One use is for the kexec on panic case where the recovery kernel
  1248. must live at a different physical address than the primary
  1249. kernel.
  1250. Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
  1251. it has been loaded at and the compile time physical address
  1252. (CONFIG_PHYSICAL_START) is ignored.
  1253. config PHYSICAL_ALIGN
  1254. hex
  1255. prompt "Alignment value to which kernel should be aligned" if X86_32
  1256. default "0x100000" if X86_32
  1257. default "0x200000" if X86_64
  1258. range 0x2000 0x400000
  1259. ---help---
  1260. This value puts the alignment restrictions on physical address
  1261. where kernel is loaded and run from. Kernel is compiled for an
  1262. address which meets above alignment restriction.
  1263. If bootloader loads the kernel at a non-aligned address and
  1264. CONFIG_RELOCATABLE is set, kernel will move itself to nearest
  1265. address aligned to above value and run from there.
  1266. If bootloader loads the kernel at a non-aligned address and
  1267. CONFIG_RELOCATABLE is not set, kernel will ignore the run time
  1268. load address and decompress itself to the address it has been
  1269. compiled for and run from there. The address for which kernel is
  1270. compiled already meets above alignment restrictions. Hence the
  1271. end result is that kernel runs from a physical address meeting
  1272. above alignment restrictions.
  1273. Don't change this unless you know what you are doing.
  1274. config HOTPLUG_CPU
  1275. bool "Support for hot-pluggable CPUs"
  1276. depends on SMP && HOTPLUG
  1277. ---help---
  1278. Say Y here to allow turning CPUs off and on. CPUs can be
  1279. controlled through /sys/devices/system/cpu.
  1280. ( Note: power management support will enable this option
  1281. automatically on SMP systems. )
  1282. Say N if you want to disable CPU hotplug.
  1283. config COMPAT_VDSO
  1284. def_bool y
  1285. prompt "Compat VDSO support"
  1286. depends on X86_32 || IA32_EMULATION
  1287. ---help---
  1288. Map the 32-bit VDSO to the predictable old-style address too.
  1289. ---help---
  1290. Say N here if you are running a sufficiently recent glibc
  1291. version (2.3.3 or later), to remove the high-mapped
  1292. VDSO mapping and to exclusively use the randomized VDSO.
  1293. If unsure, say Y.
  1294. config CMDLINE_BOOL
  1295. bool "Built-in kernel command line"
  1296. default n
  1297. ---help---
  1298. Allow for specifying boot arguments to the kernel at
  1299. build time. On some systems (e.g. embedded ones), it is
  1300. necessary or convenient to provide some or all of the
  1301. kernel boot arguments with the kernel itself (that is,
  1302. to not rely on the boot loader to provide them.)
  1303. To compile command line arguments into the kernel,
  1304. set this option to 'Y', then fill in the
  1305. the boot arguments in CONFIG_CMDLINE.
  1306. Systems with fully functional boot loaders (i.e. non-embedded)
  1307. should leave this option set to 'N'.
  1308. config CMDLINE
  1309. string "Built-in kernel command string"
  1310. depends on CMDLINE_BOOL
  1311. default ""
  1312. ---help---
  1313. Enter arguments here that should be compiled into the kernel
  1314. image and used at boot time. If the boot loader provides a
  1315. command line at boot time, it is appended to this string to
  1316. form the full kernel command line, when the system boots.
  1317. However, you can use the CONFIG_CMDLINE_OVERRIDE option to
  1318. change this behavior.
  1319. In most cases, the command line (whether built-in or provided
  1320. by the boot loader) should specify the device for the root
  1321. file system.
  1322. config CMDLINE_OVERRIDE
  1323. bool "Built-in command line overrides boot loader arguments"
  1324. default n
  1325. depends on CMDLINE_BOOL
  1326. ---help---
  1327. Set this option to 'Y' to have the kernel ignore the boot loader
  1328. command line, and use ONLY the built-in command line.
  1329. This is used to work around broken boot loaders. This should
  1330. be set to 'N' under normal conditions.
  1331. endmenu
  1332. config ARCH_ENABLE_MEMORY_HOTPLUG
  1333. def_bool y
  1334. depends on X86_64 || (X86_32 && HIGHMEM)
  1335. config ARCH_ENABLE_MEMORY_HOTREMOVE
  1336. def_bool y
  1337. depends on MEMORY_HOTPLUG
  1338. config HAVE_ARCH_EARLY_PFN_TO_NID
  1339. def_bool X86_64
  1340. depends on NUMA
  1341. menu "Power management and ACPI options"
  1342. config ARCH_HIBERNATION_HEADER
  1343. def_bool y
  1344. depends on X86_64 && HIBERNATION
  1345. source "kernel/power/Kconfig"
  1346. source "drivers/acpi/Kconfig"
  1347. config X86_APM_BOOT
  1348. bool
  1349. default y
  1350. depends on APM || APM_MODULE
  1351. menuconfig APM
  1352. tristate "APM (Advanced Power Management) BIOS support"
  1353. depends on X86_32 && PM_SLEEP
  1354. ---help---
  1355. APM is a BIOS specification for saving power using several different
  1356. techniques. This is mostly useful for battery powered laptops with
  1357. APM compliant BIOSes. If you say Y here, the system time will be
  1358. reset after a RESUME operation, the /proc/apm device will provide
  1359. battery status information, and user-space programs will receive
  1360. notification of APM "events" (e.g. battery status change).
  1361. If you select "Y" here, you can disable actual use of the APM
  1362. BIOS by passing the "apm=off" option to the kernel at boot time.
  1363. Note that the APM support is almost completely disabled for
  1364. machines with more than one CPU.
  1365. In order to use APM, you will need supporting software. For location
  1366. and more information, read <file:Documentation/power/pm.txt> and the
  1367. Battery Powered Linux mini-HOWTO, available from
  1368. <http://www.tldp.org/docs.html#howto>.
  1369. This driver does not spin down disk drives (see the hdparm(8)
  1370. manpage ("man 8 hdparm") for that), and it doesn't turn off
  1371. VESA-compliant "green" monitors.
  1372. This driver does not support the TI 4000M TravelMate and the ACER
  1373. 486/DX4/75 because they don't have compliant BIOSes. Many "green"
  1374. desktop machines also don't have compliant BIOSes, and this driver
  1375. may cause those machines to panic during the boot phase.
  1376. Generally, if you don't have a battery in your machine, there isn't
  1377. much point in using this driver and you should say N. If you get
  1378. random kernel OOPSes or reboots that don't seem to be related to
  1379. anything, try disabling/enabling this option (or disabling/enabling
  1380. APM in your BIOS).
  1381. Some other things you should try when experiencing seemingly random,
  1382. "weird" problems:
  1383. 1) make sure that you have enough swap space and that it is
  1384. enabled.
  1385. 2) pass the "no-hlt" option to the kernel
  1386. 3) switch on floating point emulation in the kernel and pass
  1387. the "no387" option to the kernel
  1388. 4) pass the "floppy=nodma" option to the kernel
  1389. 5) pass the "mem=4M" option to the kernel (thereby disabling
  1390. all but the first 4 MB of RAM)
  1391. 6) make sure that the CPU is not over clocked.
  1392. 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
  1393. 8) disable the cache from your BIOS settings
  1394. 9) install a fan for the video card or exchange video RAM
  1395. 10) install a better fan for the CPU
  1396. 11) exchange RAM chips
  1397. 12) exchange the motherboard.
  1398. To compile this driver as a module, choose M here: the
  1399. module will be called apm.
  1400. if APM
  1401. config APM_IGNORE_USER_SUSPEND
  1402. bool "Ignore USER SUSPEND"
  1403. ---help---
  1404. This option will ignore USER SUSPEND requests. On machines with a
  1405. compliant APM BIOS, you want to say N. However, on the NEC Versa M
  1406. series notebooks, it is necessary to say Y because of a BIOS bug.
  1407. config APM_DO_ENABLE
  1408. bool "Enable PM at boot time"
  1409. ---help---
  1410. Enable APM features at boot time. From page 36 of the APM BIOS
  1411. specification: "When disabled, the APM BIOS does not automatically
  1412. power manage devices, enter the Standby State, enter the Suspend
  1413. State, or take power saving steps in response to CPU Idle calls."
  1414. This driver will make CPU Idle calls when Linux is idle (unless this
  1415. feature is turned off -- see "Do CPU IDLE calls", below). This
  1416. should always save battery power, but more complicated APM features
  1417. will be dependent on your BIOS implementation. You may need to turn
  1418. this option off if your computer hangs at boot time when using APM
  1419. support, or if it beeps continuously instead of suspending. Turn
  1420. this off if you have a NEC UltraLite Versa 33/C or a Toshiba
  1421. T400CDT. This is off by default since most machines do fine without
  1422. this feature.
  1423. config APM_CPU_IDLE
  1424. bool "Make CPU Idle calls when idle"
  1425. ---help---
  1426. Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
  1427. On some machines, this can activate improved power savings, such as
  1428. a slowed CPU clock rate, when the machine is idle. These idle calls
  1429. are made after the idle loop has run for some length of time (e.g.,
  1430. 333 mS). On some machines, this will cause a hang at boot time or
  1431. whenever the CPU becomes idle. (On machines with more than one CPU,
  1432. this option does nothing.)
  1433. config APM_DISPLAY_BLANK
  1434. bool "Enable console blanking using APM"
  1435. ---help---
  1436. Enable console blanking using the APM. Some laptops can use this to
  1437. turn off the LCD backlight when the screen blanker of the Linux
  1438. virtual console blanks the screen. Note that this is only used by
  1439. the virtual console screen blanker, and won't turn off the backlight
  1440. when using the X Window system. This also doesn't have anything to
  1441. do with your VESA-compliant power-saving monitor. Further, this
  1442. option doesn't work for all laptops -- it might not turn off your
  1443. backlight at all, or it might print a lot of errors to the console,
  1444. especially if you are using gpm.
  1445. config APM_ALLOW_INTS
  1446. bool "Allow interrupts during APM BIOS calls"
  1447. ---help---
  1448. Normally we disable external interrupts while we are making calls to
  1449. the APM BIOS as a measure to lessen the effects of a badly behaving
  1450. BIOS implementation. The BIOS should reenable interrupts if it
  1451. needs to. Unfortunately, some BIOSes do not -- especially those in
  1452. many of the newer IBM Thinkpads. If you experience hangs when you
  1453. suspend, try setting this to Y. Otherwise, say N.
  1454. endif # APM
  1455. source "arch/x86/kernel/cpu/cpufreq/Kconfig"
  1456. source "drivers/cpuidle/Kconfig"
  1457. source "drivers/idle/Kconfig"
  1458. endmenu
  1459. menu "Bus options (PCI etc.)"
  1460. config PCI
  1461. bool "PCI support"
  1462. default y
  1463. select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
  1464. ---help---
  1465. Find out whether you have a PCI motherboard. PCI is the name of a
  1466. bus system, i.e. the way the CPU talks to the other stuff inside
  1467. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1468. VESA. If you have PCI, say Y, otherwise N.
  1469. choice
  1470. prompt "PCI access mode"
  1471. depends on X86_32 && PCI
  1472. default PCI_GOANY
  1473. ---help---
  1474. On PCI systems, the BIOS can be used to detect the PCI devices and
  1475. determine their configuration. However, some old PCI motherboards
  1476. have BIOS bugs and may crash if this is done. Also, some embedded
  1477. PCI-based systems don't have any BIOS at all. Linux can also try to
  1478. detect the PCI hardware directly without using the BIOS.
  1479. With this option, you can specify how Linux should detect the
  1480. PCI devices. If you choose "BIOS", the BIOS will be used,
  1481. if you choose "Direct", the BIOS won't be used, and if you
  1482. choose "MMConfig", then PCI Express MMCONFIG will be used.
  1483. If you choose "Any", the kernel will try MMCONFIG, then the
  1484. direct access method and falls back to the BIOS if that doesn't
  1485. work. If unsure, go with the default, which is "Any".
  1486. config PCI_GOBIOS
  1487. bool "BIOS"
  1488. config PCI_GOMMCONFIG
  1489. bool "MMConfig"
  1490. config PCI_GODIRECT
  1491. bool "Direct"
  1492. config PCI_GOOLPC
  1493. bool "OLPC"
  1494. depends on OLPC
  1495. config PCI_GOANY
  1496. bool "Any"
  1497. endchoice
  1498. config PCI_BIOS
  1499. def_bool y
  1500. depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
  1501. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  1502. config PCI_DIRECT
  1503. def_bool y
  1504. depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
  1505. config PCI_MMCONFIG
  1506. def_bool y
  1507. depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
  1508. config PCI_OLPC
  1509. def_bool y
  1510. depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
  1511. config PCI_DOMAINS
  1512. def_bool y
  1513. depends on PCI
  1514. config PCI_MMCONFIG
  1515. bool "Support mmconfig PCI config space access"
  1516. depends on X86_64 && PCI && ACPI
  1517. config DMAR
  1518. bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
  1519. depends on PCI_MSI && ACPI && EXPERIMENTAL
  1520. help
  1521. DMA remapping (DMAR) devices support enables independent address
  1522. translations for Direct Memory Access (DMA) from devices.
  1523. These DMA remapping devices are reported via ACPI tables
  1524. and include PCI device scope covered by these DMA
  1525. remapping devices.
  1526. config DMAR_DEFAULT_ON
  1527. def_bool y
  1528. prompt "Enable DMA Remapping Devices by default"
  1529. depends on DMAR
  1530. help
  1531. Selecting this option will enable a DMAR device at boot time if
  1532. one is found. If this option is not selected, DMAR support can
  1533. be enabled by passing intel_iommu=on to the kernel. It is
  1534. recommended you say N here while the DMAR code remains
  1535. experimental.
  1536. config DMAR_GFX_WA
  1537. def_bool y
  1538. prompt "Support for Graphics workaround"
  1539. depends on DMAR
  1540. ---help---
  1541. Current Graphics drivers tend to use physical address
  1542. for DMA and avoid using DMA APIs. Setting this config
  1543. option permits the IOMMU driver to set a unity map for
  1544. all the OS-visible memory. Hence the driver can continue
  1545. to use physical addresses for DMA.
  1546. config DMAR_FLOPPY_WA
  1547. def_bool y
  1548. depends on DMAR
  1549. ---help---
  1550. Floppy disk drivers are know to bypass DMA API calls
  1551. thereby failing to work when IOMMU is enabled. This
  1552. workaround will setup a 1:1 mapping for the first
  1553. 16M to make floppy (an ISA device) work.
  1554. config INTR_REMAP
  1555. bool "Support for Interrupt Remapping (EXPERIMENTAL)"
  1556. depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
  1557. ---help---
  1558. Supports Interrupt remapping for IO-APIC and MSI devices.
  1559. To use x2apic mode in the CPU's which support x2APIC enhancements or
  1560. to support platforms with CPU's having > 8 bit APIC ID, say Y.
  1561. source "drivers/pci/pcie/Kconfig"
  1562. source "drivers/pci/Kconfig"
  1563. # x86_64 have no ISA slots, but do have ISA-style DMA.
  1564. config ISA_DMA_API
  1565. def_bool y
  1566. if X86_32
  1567. config ISA
  1568. bool "ISA support"
  1569. ---help---
  1570. Find out whether you have ISA slots on your motherboard. ISA is the
  1571. name of a bus system, i.e. the way the CPU talks to the other stuff
  1572. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1573. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1574. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1575. config EISA
  1576. bool "EISA support"
  1577. depends on ISA
  1578. ---help---
  1579. The Extended Industry Standard Architecture (EISA) bus was
  1580. developed as an open alternative to the IBM MicroChannel bus.
  1581. The EISA bus provided some of the features of the IBM MicroChannel
  1582. bus while maintaining backward compatibility with cards made for
  1583. the older ISA bus. The EISA bus saw limited use between 1988 and
  1584. 1995 when it was made obsolete by the PCI bus.
  1585. Say Y here if you are building a kernel for an EISA-based machine.
  1586. Otherwise, say N.
  1587. source "drivers/eisa/Kconfig"
  1588. config MCA
  1589. bool "MCA support"
  1590. ---help---
  1591. MicroChannel Architecture is found in some IBM PS/2 machines and
  1592. laptops. It is a bus system similar to PCI or ISA. See
  1593. <file:Documentation/mca.txt> (and especially the web page given
  1594. there) before attempting to build an MCA bus kernel.
  1595. source "drivers/mca/Kconfig"
  1596. config SCx200
  1597. tristate "NatSemi SCx200 support"
  1598. ---help---
  1599. This provides basic support for National Semiconductor's
  1600. (now AMD's) Geode processors. The driver probes for the
  1601. PCI-IDs of several on-chip devices, so its a good dependency
  1602. for other scx200_* drivers.
  1603. If compiled as a module, the driver is named scx200.
  1604. config SCx200HR_TIMER
  1605. tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
  1606. depends on SCx200 && GENERIC_TIME
  1607. default y
  1608. ---help---
  1609. This driver provides a clocksource built upon the on-chip
  1610. 27MHz high-resolution timer. Its also a workaround for
  1611. NSC Geode SC-1100's buggy TSC, which loses time when the
  1612. processor goes idle (as is done by the scheduler). The
  1613. other workaround is idle=poll boot option.
  1614. config GEODE_MFGPT_TIMER
  1615. def_bool y
  1616. prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
  1617. depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
  1618. ---help---
  1619. This driver provides a clock event source based on the MFGPT
  1620. timer(s) in the CS5535 and CS5536 companion chip for the geode.
  1621. MFGPTs have a better resolution and max interval than the
  1622. generic PIT, and are suitable for use as high-res timers.
  1623. config OLPC
  1624. bool "One Laptop Per Child support"
  1625. default n
  1626. ---help---
  1627. Add support for detecting the unique features of the OLPC
  1628. XO hardware.
  1629. endif # X86_32
  1630. config K8_NB
  1631. def_bool y
  1632. depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
  1633. source "drivers/pcmcia/Kconfig"
  1634. source "drivers/pci/hotplug/Kconfig"
  1635. endmenu
  1636. menu "Executable file formats / Emulations"
  1637. source "fs/Kconfig.binfmt"
  1638. config IA32_EMULATION
  1639. bool "IA32 Emulation"
  1640. depends on X86_64
  1641. select COMPAT_BINFMT_ELF
  1642. ---help---
  1643. Include code to run 32-bit programs under a 64-bit kernel. You should
  1644. likely turn this on, unless you're 100% sure that you don't have any
  1645. 32-bit programs left.
  1646. config IA32_AOUT
  1647. tristate "IA32 a.out support"
  1648. depends on IA32_EMULATION
  1649. ---help---
  1650. Support old a.out binaries in the 32bit emulation.
  1651. config COMPAT
  1652. def_bool y
  1653. depends on IA32_EMULATION
  1654. config COMPAT_FOR_U64_ALIGNMENT
  1655. def_bool COMPAT
  1656. depends on X86_64
  1657. config SYSVIPC_COMPAT
  1658. def_bool y
  1659. depends on COMPAT && SYSVIPC
  1660. endmenu
  1661. config HAVE_ATOMIC_IOMAP
  1662. def_bool y
  1663. depends on X86_32
  1664. source "net/Kconfig"
  1665. source "drivers/Kconfig"
  1666. source "drivers/firmware/Kconfig"
  1667. source "fs/Kconfig"
  1668. source "arch/x86/Kconfig.debug"
  1669. source "security/Kconfig"
  1670. source "crypto/Kconfig"
  1671. source "arch/x86/kvm/Kconfig"
  1672. source "lib/Kconfig"