Kconfig 67 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_PERF_COUNTERS if (!M386 && !M486)
  24. select HAVE_IOREMAP_PROT
  25. select HAVE_KPROBES
  26. select ARCH_WANT_OPTIONAL_GPIOLIB
  27. select ARCH_WANT_FRAME_POINTERS
  28. select HAVE_DMA_ATTRS
  29. select HAVE_KRETPROBES
  30. select HAVE_FTRACE_MCOUNT_RECORD
  31. select HAVE_DYNAMIC_FTRACE
  32. select HAVE_FUNCTION_TRACER
  33. select HAVE_FUNCTION_GRAPH_TRACER
  34. select HAVE_FUNCTION_GRAPH_FP_TEST
  35. select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  36. select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE
  37. select HAVE_SYSCALL_TRACEPOINTS
  38. select HAVE_KVM
  39. select HAVE_ARCH_KGDB
  40. select HAVE_ARCH_TRACEHOOK
  41. select HAVE_GENERIC_DMA_COHERENT if X86_32
  42. select HAVE_EFFICIENT_UNALIGNED_ACCESS
  43. select USER_STACKTRACE_SUPPORT
  44. select HAVE_DMA_API_DEBUG
  45. select HAVE_KERNEL_GZIP
  46. select HAVE_KERNEL_BZIP2
  47. select HAVE_KERNEL_LZMA
  48. select HAVE_ARCH_KMEMCHECK
  49. config OUTPUT_FORMAT
  50. string
  51. default "elf32-i386" if X86_32
  52. default "elf64-x86-64" if X86_64
  53. config ARCH_DEFCONFIG
  54. string
  55. default "arch/x86/configs/i386_defconfig" if X86_32
  56. default "arch/x86/configs/x86_64_defconfig" if X86_64
  57. config GENERIC_TIME
  58. def_bool y
  59. config GENERIC_CMOS_UPDATE
  60. def_bool y
  61. config CLOCKSOURCE_WATCHDOG
  62. def_bool y
  63. config GENERIC_CLOCKEVENTS
  64. def_bool y
  65. config GENERIC_CLOCKEVENTS_BROADCAST
  66. def_bool y
  67. depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
  68. config LOCKDEP_SUPPORT
  69. def_bool y
  70. config STACKTRACE_SUPPORT
  71. def_bool y
  72. config HAVE_LATENCYTOP_SUPPORT
  73. def_bool y
  74. config FAST_CMPXCHG_LOCAL
  75. bool
  76. default y
  77. config MMU
  78. def_bool y
  79. config ZONE_DMA
  80. def_bool y
  81. config SBUS
  82. bool
  83. config GENERIC_ISA_DMA
  84. def_bool y
  85. config GENERIC_IOMAP
  86. def_bool y
  87. config GENERIC_BUG
  88. def_bool y
  89. depends on BUG
  90. select GENERIC_BUG_RELATIVE_POINTERS if X86_64
  91. config GENERIC_BUG_RELATIVE_POINTERS
  92. bool
  93. config GENERIC_HWEIGHT
  94. def_bool y
  95. config GENERIC_GPIO
  96. bool
  97. config ARCH_MAY_HAVE_PC_FDC
  98. def_bool y
  99. config RWSEM_GENERIC_SPINLOCK
  100. def_bool !X86_XADD
  101. config RWSEM_XCHGADD_ALGORITHM
  102. def_bool X86_XADD
  103. config ARCH_HAS_CPU_IDLE_WAIT
  104. def_bool y
  105. config GENERIC_CALIBRATE_DELAY
  106. def_bool y
  107. config GENERIC_TIME_VSYSCALL
  108. bool
  109. default X86_64
  110. config ARCH_HAS_CPU_RELAX
  111. def_bool y
  112. config ARCH_HAS_DEFAULT_IDLE
  113. def_bool y
  114. config ARCH_HAS_CACHE_LINE_SIZE
  115. def_bool y
  116. config HAVE_SETUP_PER_CPU_AREA
  117. def_bool y
  118. config HAVE_DYNAMIC_PER_CPU_AREA
  119. def_bool y
  120. config HAVE_CPUMASK_OF_CPU_MAP
  121. def_bool X86_64_SMP
  122. config ARCH_HIBERNATION_POSSIBLE
  123. def_bool y
  124. config ARCH_SUSPEND_POSSIBLE
  125. def_bool y
  126. config ZONE_DMA32
  127. bool
  128. default X86_64
  129. config ARCH_POPULATES_NODE_MAP
  130. def_bool y
  131. config AUDIT_ARCH
  132. bool
  133. default X86_64
  134. config ARCH_SUPPORTS_OPTIMIZED_INLINING
  135. def_bool y
  136. config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  137. def_bool y
  138. config HAVE_INTEL_TXT
  139. def_bool y
  140. depends on EXPERIMENTAL && DMAR && ACPI
  141. # Use the generic interrupt handling code in kernel/irq/:
  142. config GENERIC_HARDIRQS
  143. bool
  144. default y
  145. config GENERIC_HARDIRQS_NO__DO_IRQ
  146. def_bool y
  147. config GENERIC_IRQ_PROBE
  148. bool
  149. default y
  150. config GENERIC_PENDING_IRQ
  151. bool
  152. depends on GENERIC_HARDIRQS && SMP
  153. default y
  154. config USE_GENERIC_SMP_HELPERS
  155. def_bool y
  156. depends on SMP
  157. config X86_32_SMP
  158. def_bool y
  159. depends on X86_32 && SMP
  160. config X86_64_SMP
  161. def_bool y
  162. depends on X86_64 && SMP
  163. config X86_HT
  164. bool
  165. depends on SMP
  166. default y
  167. config X86_TRAMPOLINE
  168. bool
  169. depends on SMP || (64BIT && ACPI_SLEEP)
  170. default y
  171. config X86_32_LAZY_GS
  172. def_bool y
  173. depends on X86_32 && !CC_STACKPROTECTOR
  174. config KTIME_SCALAR
  175. def_bool X86_32
  176. source "init/Kconfig"
  177. source "kernel/Kconfig.freezer"
  178. menu "Processor type and features"
  179. source "kernel/time/Kconfig"
  180. config SMP
  181. bool "Symmetric multi-processing support"
  182. ---help---
  183. This enables support for systems with more than one CPU. If you have
  184. a system with only one CPU, like most personal computers, say N. If
  185. you have a system with more than one CPU, say Y.
  186. If you say N here, the kernel will run on single and multiprocessor
  187. machines, but will use only one CPU of a multiprocessor machine. If
  188. you say Y here, the kernel will run on many, but not all,
  189. singleprocessor machines. On a singleprocessor machine, the kernel
  190. will run faster if you say N here.
  191. Note that if you say Y here and choose architecture "586" or
  192. "Pentium" under "Processor family", the kernel will not work on 486
  193. architectures. Similarly, multiprocessor kernels for the "PPro"
  194. architecture may not work on all Pentium based boards.
  195. People using multiprocessor machines who say Y here should also say
  196. Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
  197. Management" code will be disabled if you say Y here.
  198. See also <file:Documentation/i386/IO-APIC.txt>,
  199. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  200. <http://www.tldp.org/docs.html#howto>.
  201. If you don't know what to do here, say N.
  202. config X86_X2APIC
  203. bool "Support x2apic"
  204. depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
  205. ---help---
  206. This enables x2apic support on CPUs that have this feature.
  207. This allows 32-bit apic IDs (so it can support very large systems),
  208. and accesses the local apic via MSRs not via mmio.
  209. If you don't know what to do here, say N.
  210. config SPARSE_IRQ
  211. bool "Support sparse irq numbering"
  212. depends on PCI_MSI || HT_IRQ
  213. ---help---
  214. This enables support for sparse irqs. This is useful for distro
  215. kernels that want to define a high CONFIG_NR_CPUS value but still
  216. want to have low kernel memory footprint on smaller machines.
  217. ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
  218. out the irq_desc[] array in a more NUMA-friendly way. )
  219. If you don't know what to do here, say N.
  220. config NUMA_IRQ_DESC
  221. def_bool y
  222. depends on SPARSE_IRQ && NUMA
  223. config X86_MPPARSE
  224. bool "Enable MPS table" if ACPI
  225. default y
  226. depends on X86_LOCAL_APIC
  227. ---help---
  228. For old smp systems that do not have proper acpi support. Newer systems
  229. (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
  230. config X86_BIGSMP
  231. bool "Support for big SMP systems with more than 8 CPUs"
  232. depends on X86_32 && SMP
  233. ---help---
  234. This option is needed for the systems that have more than 8 CPUs
  235. if X86_32
  236. config X86_EXTENDED_PLATFORM
  237. bool "Support for extended (non-PC) x86 platforms"
  238. default y
  239. ---help---
  240. If you disable this option then the kernel will only support
  241. standard PC platforms. (which covers the vast majority of
  242. systems out there.)
  243. If you enable this option then you'll be able to select support
  244. for the following (non-PC) 32 bit x86 platforms:
  245. AMD Elan
  246. NUMAQ (IBM/Sequent)
  247. RDC R-321x SoC
  248. SGI 320/540 (Visual Workstation)
  249. Summit/EXA (IBM x440)
  250. Unisys ES7000 IA32 series
  251. If you have one of these systems, or if you want to build a
  252. generic distribution kernel, say Y here - otherwise say N.
  253. endif
  254. if X86_64
  255. config X86_EXTENDED_PLATFORM
  256. bool "Support for extended (non-PC) x86 platforms"
  257. default y
  258. ---help---
  259. If you disable this option then the kernel will only support
  260. standard PC platforms. (which covers the vast majority of
  261. systems out there.)
  262. If you enable this option then you'll be able to select support
  263. for the following (non-PC) 64 bit x86 platforms:
  264. ScaleMP vSMP
  265. SGI Ultraviolet
  266. If you have one of these systems, or if you want to build a
  267. generic distribution kernel, say Y here - otherwise say N.
  268. endif
  269. # This is an alphabetically sorted list of 64 bit extended platforms
  270. # Please maintain the alphabetic order if and when there are additions
  271. config X86_VSMP
  272. bool "ScaleMP vSMP"
  273. select PARAVIRT
  274. depends on X86_64 && PCI
  275. depends on X86_EXTENDED_PLATFORM
  276. ---help---
  277. Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
  278. supposed to run on these EM64T-based machines. Only choose this option
  279. if you have one of these machines.
  280. config X86_UV
  281. bool "SGI Ultraviolet"
  282. depends on X86_64
  283. depends on X86_EXTENDED_PLATFORM
  284. depends on NUMA
  285. depends on X86_X2APIC
  286. ---help---
  287. This option is needed in order to support SGI Ultraviolet systems.
  288. If you don't have one of these, you should say N here.
  289. # Following is an alphabetically sorted list of 32 bit extended platforms
  290. # Please maintain the alphabetic order if and when there are additions
  291. config X86_ELAN
  292. bool "AMD Elan"
  293. depends on X86_32
  294. depends on X86_EXTENDED_PLATFORM
  295. ---help---
  296. Select this for an AMD Elan processor.
  297. Do not use this option for K6/Athlon/Opteron processors!
  298. If unsure, choose "PC-compatible" instead.
  299. config X86_RDC321X
  300. bool "RDC R-321x SoC"
  301. depends on X86_32
  302. depends on X86_EXTENDED_PLATFORM
  303. select M486
  304. select X86_REBOOTFIXUPS
  305. ---help---
  306. This option is needed for RDC R-321x system-on-chip, also known
  307. as R-8610-(G).
  308. If you don't have one of these chips, you should say N here.
  309. config X86_32_NON_STANDARD
  310. bool "Support non-standard 32-bit SMP architectures"
  311. depends on X86_32 && SMP
  312. depends on X86_EXTENDED_PLATFORM
  313. ---help---
  314. This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
  315. subarchitectures. It is intended for a generic binary kernel.
  316. if you select them all, kernel will probe it one by one. and will
  317. fallback to default.
  318. # Alphabetically sorted list of Non standard 32 bit platforms
  319. config X86_NUMAQ
  320. bool "NUMAQ (IBM/Sequent)"
  321. depends on X86_32_NON_STANDARD
  322. select NUMA
  323. select X86_MPPARSE
  324. ---help---
  325. This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
  326. NUMA multiquad box. This changes the way that processors are
  327. bootstrapped, and uses Clustered Logical APIC addressing mode instead
  328. of Flat Logical. You will need a new lynxer.elf file to flash your
  329. firmware with - send email to <Martin.Bligh@us.ibm.com>.
  330. config X86_VISWS
  331. bool "SGI 320/540 (Visual Workstation)"
  332. depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
  333. depends on X86_32_NON_STANDARD
  334. ---help---
  335. The SGI Visual Workstation series is an IA32-based workstation
  336. based on SGI systems chips with some legacy PC hardware attached.
  337. Say Y here to create a kernel to run on the SGI 320 or 540.
  338. A kernel compiled for the Visual Workstation will run on general
  339. PCs as well. See <file:Documentation/sgi-visws.txt> for details.
  340. config X86_SUMMIT
  341. bool "Summit/EXA (IBM x440)"
  342. depends on X86_32_NON_STANDARD
  343. ---help---
  344. This option is needed for IBM systems that use the Summit/EXA chipset.
  345. In particular, it is needed for the x440.
  346. config X86_ES7000
  347. bool "Unisys ES7000 IA32 series"
  348. depends on X86_32_NON_STANDARD && X86_BIGSMP
  349. ---help---
  350. Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
  351. supposed to run on an IA32-based Unisys ES7000 system.
  352. config SCHED_OMIT_FRAME_POINTER
  353. def_bool y
  354. prompt "Single-depth WCHAN output"
  355. depends on X86
  356. ---help---
  357. Calculate simpler /proc/<PID>/wchan values. If this option
  358. is disabled then wchan values will recurse back to the
  359. caller function. This provides more accurate wchan values,
  360. at the expense of slightly more scheduling overhead.
  361. If in doubt, say "Y".
  362. menuconfig PARAVIRT_GUEST
  363. bool "Paravirtualized guest support"
  364. ---help---
  365. Say Y here to get to see options related to running Linux under
  366. various hypervisors. This option alone does not add any kernel code.
  367. If you say N, all options in this submenu will be skipped and disabled.
  368. if PARAVIRT_GUEST
  369. source "arch/x86/xen/Kconfig"
  370. config VMI
  371. bool "VMI Guest support"
  372. select PARAVIRT
  373. depends on X86_32
  374. ---help---
  375. VMI provides a paravirtualized interface to the VMware ESX server
  376. (it could be used by other hypervisors in theory too, but is not
  377. at the moment), by linking the kernel to a GPL-ed ROM module
  378. provided by the hypervisor.
  379. config KVM_CLOCK
  380. bool "KVM paravirtualized clock"
  381. select PARAVIRT
  382. select PARAVIRT_CLOCK
  383. ---help---
  384. Turning on this option will allow you to run a paravirtualized clock
  385. when running over the KVM hypervisor. Instead of relying on a PIT
  386. (or probably other) emulation by the underlying device model, the host
  387. provides the guest with timing infrastructure such as time of day, and
  388. system time
  389. config KVM_GUEST
  390. bool "KVM Guest support"
  391. select PARAVIRT
  392. ---help---
  393. This option enables various optimizations for running under the KVM
  394. hypervisor.
  395. source "arch/x86/lguest/Kconfig"
  396. config PARAVIRT
  397. bool "Enable paravirtualization code"
  398. ---help---
  399. This changes the kernel so it can modify itself when it is run
  400. under a hypervisor, potentially improving performance significantly
  401. over full virtualization. However, when run without a hypervisor
  402. the kernel is theoretically slower and slightly larger.
  403. config PARAVIRT_SPINLOCKS
  404. bool "Paravirtualization layer for spinlocks"
  405. depends on PARAVIRT && SMP && EXPERIMENTAL
  406. ---help---
  407. Paravirtualized spinlocks allow a pvops backend to replace the
  408. spinlock implementation with something virtualization-friendly
  409. (for example, block the virtual CPU rather than spinning).
  410. Unfortunately the downside is an up to 5% performance hit on
  411. native kernels, with various workloads.
  412. If you are unsure how to answer this question, answer N.
  413. config PARAVIRT_CLOCK
  414. bool
  415. default n
  416. endif
  417. config PARAVIRT_DEBUG
  418. bool "paravirt-ops debugging"
  419. depends on PARAVIRT && DEBUG_KERNEL
  420. ---help---
  421. Enable to debug paravirt_ops internals. Specifically, BUG if
  422. a paravirt_op is missing when it is called.
  423. config MEMTEST
  424. bool "Memtest"
  425. ---help---
  426. This option adds a kernel parameter 'memtest', which allows memtest
  427. to be set.
  428. memtest=0, mean disabled; -- default
  429. memtest=1, mean do 1 test pattern;
  430. ...
  431. memtest=4, mean do 4 test patterns.
  432. If you are unsure how to answer this question, answer N.
  433. config X86_SUMMIT_NUMA
  434. def_bool y
  435. depends on X86_32 && NUMA && X86_32_NON_STANDARD
  436. config X86_CYCLONE_TIMER
  437. def_bool y
  438. depends on X86_32_NON_STANDARD
  439. source "arch/x86/Kconfig.cpu"
  440. config HPET_TIMER
  441. def_bool X86_64
  442. prompt "HPET Timer Support" if X86_32
  443. ---help---
  444. Use the IA-PC HPET (High Precision Event Timer) to manage
  445. time in preference to the PIT and RTC, if a HPET is
  446. present.
  447. HPET is the next generation timer replacing legacy 8254s.
  448. The HPET provides a stable time base on SMP
  449. systems, unlike the TSC, but it is more expensive to access,
  450. as it is off-chip. You can find the HPET spec at
  451. <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
  452. You can safely choose Y here. However, HPET will only be
  453. activated if the platform and the BIOS support this feature.
  454. Otherwise the 8254 will be used for timing services.
  455. Choose N to continue using the legacy 8254 timer.
  456. config HPET_EMULATE_RTC
  457. def_bool y
  458. depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
  459. # Mark as embedded because too many people got it wrong.
  460. # The code disables itself when not needed.
  461. config DMI
  462. default y
  463. bool "Enable DMI scanning" if EMBEDDED
  464. ---help---
  465. Enabled scanning of DMI to identify machine quirks. Say Y
  466. here unless you have verified that your setup is not
  467. affected by entries in the DMI blacklist. Required by PNP
  468. BIOS code.
  469. config GART_IOMMU
  470. bool "GART IOMMU support" if EMBEDDED
  471. default y
  472. select SWIOTLB
  473. depends on X86_64 && PCI
  474. ---help---
  475. Support for full DMA access of devices with 32bit memory access only
  476. on systems with more than 3GB. This is usually needed for USB,
  477. sound, many IDE/SATA chipsets and some other devices.
  478. Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
  479. based hardware IOMMU and a software bounce buffer based IOMMU used
  480. on Intel systems and as fallback.
  481. The code is only active when needed (enough memory and limited
  482. device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
  483. too.
  484. config CALGARY_IOMMU
  485. bool "IBM Calgary IOMMU support"
  486. select SWIOTLB
  487. depends on X86_64 && PCI && EXPERIMENTAL
  488. ---help---
  489. Support for hardware IOMMUs in IBM's xSeries x366 and x460
  490. systems. Needed to run systems with more than 3GB of memory
  491. properly with 32-bit PCI devices that do not support DAC
  492. (Double Address Cycle). Calgary also supports bus level
  493. isolation, where all DMAs pass through the IOMMU. This
  494. prevents them from going anywhere except their intended
  495. destination. This catches hard-to-find kernel bugs and
  496. mis-behaving drivers and devices that do not use the DMA-API
  497. properly to set up their DMA buffers. The IOMMU can be
  498. turned off at boot time with the iommu=off parameter.
  499. Normally the kernel will make the right choice by itself.
  500. If unsure, say Y.
  501. config CALGARY_IOMMU_ENABLED_BY_DEFAULT
  502. def_bool y
  503. prompt "Should Calgary be enabled by default?"
  504. depends on CALGARY_IOMMU
  505. ---help---
  506. Should Calgary be enabled by default? if you choose 'y', Calgary
  507. will be used (if it exists). If you choose 'n', Calgary will not be
  508. used even if it exists. If you choose 'n' and would like to use
  509. Calgary anyway, pass 'iommu=calgary' on the kernel command line.
  510. If unsure, say Y.
  511. config AMD_IOMMU
  512. bool "AMD IOMMU support"
  513. select SWIOTLB
  514. select PCI_MSI
  515. depends on X86_64 && PCI && ACPI
  516. ---help---
  517. With this option you can enable support for AMD IOMMU hardware in
  518. your system. An IOMMU is a hardware component which provides
  519. remapping of DMA memory accesses from devices. With an AMD IOMMU you
  520. can isolate the the DMA memory of different devices and protect the
  521. system from misbehaving device drivers or hardware.
  522. You can find out if your system has an AMD IOMMU if you look into
  523. your BIOS for an option to enable it or if you have an IVRS ACPI
  524. table.
  525. config AMD_IOMMU_STATS
  526. bool "Export AMD IOMMU statistics to debugfs"
  527. depends on AMD_IOMMU
  528. select DEBUG_FS
  529. ---help---
  530. This option enables code in the AMD IOMMU driver to collect various
  531. statistics about whats happening in the driver and exports that
  532. information to userspace via debugfs.
  533. If unsure, say N.
  534. # need this always selected by IOMMU for the VIA workaround
  535. config SWIOTLB
  536. def_bool y if X86_64
  537. ---help---
  538. Support for software bounce buffers used on x86-64 systems
  539. which don't have a hardware IOMMU (e.g. the current generation
  540. of Intel's x86-64 CPUs). Using this PCI devices which can only
  541. access 32-bits of memory can be used on systems with more than
  542. 3 GB of memory. If unsure, say Y.
  543. config IOMMU_HELPER
  544. def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
  545. config IOMMU_API
  546. def_bool (AMD_IOMMU || DMAR)
  547. config MAXSMP
  548. bool "Configure Maximum number of SMP Processors and NUMA Nodes"
  549. depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
  550. select CPUMASK_OFFSTACK
  551. default n
  552. ---help---
  553. Configure maximum number of CPUS and NUMA Nodes for this architecture.
  554. If unsure, say N.
  555. config NR_CPUS
  556. int "Maximum number of CPUs" if SMP && !MAXSMP
  557. range 2 8 if SMP && X86_32 && !X86_BIGSMP
  558. range 2 512 if SMP && !MAXSMP
  559. default "1" if !SMP
  560. default "4096" if MAXSMP
  561. default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
  562. default "8" if SMP
  563. ---help---
  564. This allows you to specify the maximum number of CPUs which this
  565. kernel will support. The maximum supported value is 512 and the
  566. minimum value which makes sense is 2.
  567. This is purely to save memory - each supported CPU adds
  568. approximately eight kilobytes to the kernel image.
  569. config SCHED_SMT
  570. bool "SMT (Hyperthreading) scheduler support"
  571. depends on X86_HT
  572. ---help---
  573. SMT scheduler support improves the CPU scheduler's decision making
  574. when dealing with Intel Pentium 4 chips with HyperThreading at a
  575. cost of slightly increased overhead in some places. If unsure say
  576. N here.
  577. config SCHED_MC
  578. def_bool y
  579. prompt "Multi-core scheduler support"
  580. depends on X86_HT
  581. ---help---
  582. Multi-core scheduler support improves the CPU scheduler's decision
  583. making when dealing with multi-core CPU chips at a cost of slightly
  584. increased overhead in some places. If unsure say N here.
  585. source "kernel/Kconfig.preempt"
  586. config X86_UP_APIC
  587. bool "Local APIC support on uniprocessors"
  588. depends on X86_32 && !SMP && !X86_32_NON_STANDARD
  589. ---help---
  590. A local APIC (Advanced Programmable Interrupt Controller) is an
  591. integrated interrupt controller in the CPU. If you have a single-CPU
  592. system which has a processor with a local APIC, you can say Y here to
  593. enable and use it. If you say Y here even though your machine doesn't
  594. have a local APIC, then the kernel will still run with no slowdown at
  595. all. The local APIC supports CPU-generated self-interrupts (timer,
  596. performance counters), and the NMI watchdog which detects hard
  597. lockups.
  598. config X86_UP_IOAPIC
  599. bool "IO-APIC support on uniprocessors"
  600. depends on X86_UP_APIC
  601. ---help---
  602. An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
  603. SMP-capable replacement for PC-style interrupt controllers. Most
  604. SMP systems and many recent uniprocessor systems have one.
  605. If you have a single-CPU system with an IO-APIC, you can say Y here
  606. to use it. If you say Y here even though your machine doesn't have
  607. an IO-APIC, then the kernel will still run with no slowdown at all.
  608. config X86_LOCAL_APIC
  609. def_bool y
  610. depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
  611. config X86_IO_APIC
  612. def_bool y
  613. depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
  614. config X86_VISWS_APIC
  615. def_bool y
  616. depends on X86_32 && X86_VISWS
  617. config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
  618. bool "Reroute for broken boot IRQs"
  619. default n
  620. depends on X86_IO_APIC
  621. ---help---
  622. This option enables a workaround that fixes a source of
  623. spurious interrupts. This is recommended when threaded
  624. interrupt handling is used on systems where the generation of
  625. superfluous "boot interrupts" cannot be disabled.
  626. Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
  627. entry in the chipset's IO-APIC is masked (as, e.g. the RT
  628. kernel does during interrupt handling). On chipsets where this
  629. boot IRQ generation cannot be disabled, this workaround keeps
  630. the original IRQ line masked so that only the equivalent "boot
  631. IRQ" is delivered to the CPUs. The workaround also tells the
  632. kernel to set up the IRQ handler on the boot IRQ line. In this
  633. way only one interrupt is delivered to the kernel. Otherwise
  634. the spurious second interrupt may cause the kernel to bring
  635. down (vital) interrupt lines.
  636. Only affects "broken" chipsets. Interrupt sharing may be
  637. increased on these systems.
  638. config X86_MCE
  639. bool "Machine Check Exception"
  640. ---help---
  641. Machine Check Exception support allows the processor to notify the
  642. kernel if it detects a problem (e.g. overheating, component failure).
  643. The action the kernel takes depends on the severity of the problem,
  644. ranging from a warning message on the console, to halting the machine.
  645. Your processor must be a Pentium or newer to support this - check the
  646. flags in /proc/cpuinfo for mce. Note that some older Pentium systems
  647. have a design flaw which leads to false MCE events - hence MCE is
  648. disabled on all P5 processors, unless explicitly enabled with "mce"
  649. as a boot argument. Similarly, if MCE is built in and creates a
  650. problem on some new non-standard machine, you can boot with "nomce"
  651. to disable it. MCE support simply ignores non-MCE processors like
  652. the 386 and 486, so nearly everyone can say Y here.
  653. config X86_OLD_MCE
  654. depends on X86_32 && X86_MCE
  655. bool "Use legacy machine check code (will go away)"
  656. default n
  657. select X86_ANCIENT_MCE
  658. ---help---
  659. Use the old i386 machine check code. This is merely intended for
  660. testing in a transition period. Try this if you run into any machine
  661. check related software problems, but report the problem to
  662. linux-kernel. When in doubt say no.
  663. config X86_NEW_MCE
  664. depends on X86_MCE
  665. bool
  666. default y if (!X86_OLD_MCE && X86_32) || X86_64
  667. config X86_MCE_INTEL
  668. def_bool y
  669. prompt "Intel MCE features"
  670. depends on X86_NEW_MCE && X86_LOCAL_APIC
  671. ---help---
  672. Additional support for intel specific MCE features such as
  673. the thermal monitor.
  674. config X86_MCE_AMD
  675. def_bool y
  676. prompt "AMD MCE features"
  677. depends on X86_NEW_MCE && X86_LOCAL_APIC
  678. ---help---
  679. Additional support for AMD specific MCE features such as
  680. the DRAM Error Threshold.
  681. config X86_ANCIENT_MCE
  682. def_bool n
  683. depends on X86_32
  684. prompt "Support for old Pentium 5 / WinChip machine checks"
  685. ---help---
  686. Include support for machine check handling on old Pentium 5 or WinChip
  687. systems. These typically need to be enabled explicitely on the command
  688. line.
  689. config X86_MCE_THRESHOLD
  690. depends on X86_MCE_AMD || X86_MCE_INTEL
  691. bool
  692. default y
  693. config X86_MCE_INJECT
  694. depends on X86_NEW_MCE
  695. tristate "Machine check injector support"
  696. ---help---
  697. Provide support for injecting machine checks for testing purposes.
  698. If you don't know what a machine check is and you don't do kernel
  699. QA it is safe to say n.
  700. config X86_MCE_NONFATAL
  701. tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
  702. depends on X86_OLD_MCE
  703. ---help---
  704. Enabling this feature starts a timer that triggers every 5 seconds which
  705. will look at the machine check registers to see if anything happened.
  706. Non-fatal problems automatically get corrected (but still logged).
  707. Disable this if you don't want to see these messages.
  708. Seeing the messages this option prints out may be indicative of dying
  709. or out-of-spec (ie, overclocked) hardware.
  710. This option only does something on certain CPUs.
  711. (AMD Athlon/Duron and Intel Pentium 4)
  712. config X86_MCE_P4THERMAL
  713. bool "check for P4 thermal throttling interrupt."
  714. depends on X86_OLD_MCE && X86_MCE && (X86_UP_APIC || SMP)
  715. ---help---
  716. Enabling this feature will cause a message to be printed when the P4
  717. enters thermal throttling.
  718. config X86_THERMAL_VECTOR
  719. def_bool y
  720. depends on X86_MCE_P4THERMAL || X86_MCE_INTEL
  721. config VM86
  722. bool "Enable VM86 support" if EMBEDDED
  723. default y
  724. depends on X86_32
  725. ---help---
  726. This option is required by programs like DOSEMU to run 16-bit legacy
  727. code on X86 processors. It also may be needed by software like
  728. XFree86 to initialize some video cards via BIOS. Disabling this
  729. option saves about 6k.
  730. config TOSHIBA
  731. tristate "Toshiba Laptop support"
  732. depends on X86_32
  733. ---help---
  734. This adds a driver to safely access the System Management Mode of
  735. the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
  736. not work on models with a Phoenix BIOS. The System Management Mode
  737. is used to set the BIOS and power saving options on Toshiba portables.
  738. For information on utilities to make use of this driver see the
  739. Toshiba Linux utilities web site at:
  740. <http://www.buzzard.org.uk/toshiba/>.
  741. Say Y if you intend to run this kernel on a Toshiba portable.
  742. Say N otherwise.
  743. config I8K
  744. tristate "Dell laptop support"
  745. ---help---
  746. This adds a driver to safely access the System Management Mode
  747. of the CPU on the Dell Inspiron 8000. The System Management Mode
  748. is used to read cpu temperature and cooling fan status and to
  749. control the fans on the I8K portables.
  750. This driver has been tested only on the Inspiron 8000 but it may
  751. also work with other Dell laptops. You can force loading on other
  752. models by passing the parameter `force=1' to the module. Use at
  753. your own risk.
  754. For information on utilities to make use of this driver see the
  755. I8K Linux utilities web site at:
  756. <http://people.debian.org/~dz/i8k/>
  757. Say Y if you intend to run this kernel on a Dell Inspiron 8000.
  758. Say N otherwise.
  759. config X86_REBOOTFIXUPS
  760. bool "Enable X86 board specific fixups for reboot"
  761. depends on X86_32
  762. ---help---
  763. This enables chipset and/or board specific fixups to be done
  764. in order to get reboot to work correctly. This is only needed on
  765. some combinations of hardware and BIOS. The symptom, for which
  766. this config is intended, is when reboot ends with a stalled/hung
  767. system.
  768. Currently, the only fixup is for the Geode machines using
  769. CS5530A and CS5536 chipsets and the RDC R-321x SoC.
  770. Say Y if you want to enable the fixup. Currently, it's safe to
  771. enable this option even if you don't need it.
  772. Say N otherwise.
  773. config MICROCODE
  774. tristate "/dev/cpu/microcode - microcode support"
  775. select FW_LOADER
  776. ---help---
  777. If you say Y here, you will be able to update the microcode on
  778. certain Intel and AMD processors. The Intel support is for the
  779. IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
  780. Pentium 4, Xeon etc. The AMD support is for family 0x10 and
  781. 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
  782. You will obviously need the actual microcode binary data itself
  783. which is not shipped with the Linux kernel.
  784. This option selects the general module only, you need to select
  785. at least one vendor specific module as well.
  786. To compile this driver as a module, choose M here: the
  787. module will be called microcode.
  788. config MICROCODE_INTEL
  789. bool "Intel microcode patch loading support"
  790. depends on MICROCODE
  791. default MICROCODE
  792. select FW_LOADER
  793. ---help---
  794. This options enables microcode patch loading support for Intel
  795. processors.
  796. For latest news and information on obtaining all the required
  797. Intel ingredients for this driver, check:
  798. <http://www.urbanmyth.org/microcode/>.
  799. config MICROCODE_AMD
  800. bool "AMD microcode patch loading support"
  801. depends on MICROCODE
  802. select FW_LOADER
  803. ---help---
  804. If you select this option, microcode patch loading support for AMD
  805. processors will be enabled.
  806. config MICROCODE_OLD_INTERFACE
  807. def_bool y
  808. depends on MICROCODE
  809. config X86_MSR
  810. tristate "/dev/cpu/*/msr - Model-specific register support"
  811. ---help---
  812. This device gives privileged processes access to the x86
  813. Model-Specific Registers (MSRs). It is a character device with
  814. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  815. MSR accesses are directed to a specific CPU on multi-processor
  816. systems.
  817. config X86_CPUID
  818. tristate "/dev/cpu/*/cpuid - CPU information support"
  819. ---help---
  820. This device gives processes access to the x86 CPUID instruction to
  821. be executed on a specific processor. It is a character device
  822. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  823. /dev/cpu/31/cpuid.
  824. config X86_CPU_DEBUG
  825. tristate "/sys/kernel/debug/x86/cpu/* - CPU Debug support"
  826. ---help---
  827. If you select this option, this will provide various x86 CPUs
  828. information through debugfs.
  829. choice
  830. prompt "High Memory Support"
  831. default HIGHMEM4G if !X86_NUMAQ
  832. default HIGHMEM64G if X86_NUMAQ
  833. depends on X86_32
  834. config NOHIGHMEM
  835. bool "off"
  836. depends on !X86_NUMAQ
  837. ---help---
  838. Linux can use up to 64 Gigabytes of physical memory on x86 systems.
  839. However, the address space of 32-bit x86 processors is only 4
  840. Gigabytes large. That means that, if you have a large amount of
  841. physical memory, not all of it can be "permanently mapped" by the
  842. kernel. The physical memory that's not permanently mapped is called
  843. "high memory".
  844. If you are compiling a kernel which will never run on a machine with
  845. more than 1 Gigabyte total physical RAM, answer "off" here (default
  846. choice and suitable for most users). This will result in a "3GB/1GB"
  847. split: 3GB are mapped so that each process sees a 3GB virtual memory
  848. space and the remaining part of the 4GB virtual memory space is used
  849. by the kernel to permanently map as much physical memory as
  850. possible.
  851. If the machine has between 1 and 4 Gigabytes physical RAM, then
  852. answer "4GB" here.
  853. If more than 4 Gigabytes is used then answer "64GB" here. This
  854. selection turns Intel PAE (Physical Address Extension) mode on.
  855. PAE implements 3-level paging on IA32 processors. PAE is fully
  856. supported by Linux, PAE mode is implemented on all recent Intel
  857. processors (Pentium Pro and better). NOTE: If you say "64GB" here,
  858. then the kernel will not boot on CPUs that don't support PAE!
  859. The actual amount of total physical memory will either be
  860. auto detected or can be forced by using a kernel command line option
  861. such as "mem=256M". (Try "man bootparam" or see the documentation of
  862. your boot loader (lilo or loadlin) about how to pass options to the
  863. kernel at boot time.)
  864. If unsure, say "off".
  865. config HIGHMEM4G
  866. bool "4GB"
  867. depends on !X86_NUMAQ
  868. ---help---
  869. Select this if you have a 32-bit processor and between 1 and 4
  870. gigabytes of physical RAM.
  871. config HIGHMEM64G
  872. bool "64GB"
  873. depends on !M386 && !M486
  874. select X86_PAE
  875. ---help---
  876. Select this if you have a 32-bit processor and more than 4
  877. gigabytes of physical RAM.
  878. endchoice
  879. choice
  880. depends on EXPERIMENTAL
  881. prompt "Memory split" if EMBEDDED
  882. default VMSPLIT_3G
  883. depends on X86_32
  884. ---help---
  885. Select the desired split between kernel and user memory.
  886. If the address range available to the kernel is less than the
  887. physical memory installed, the remaining memory will be available
  888. as "high memory". Accessing high memory is a little more costly
  889. than low memory, as it needs to be mapped into the kernel first.
  890. Note that increasing the kernel address space limits the range
  891. available to user programs, making the address space there
  892. tighter. Selecting anything other than the default 3G/1G split
  893. will also likely make your kernel incompatible with binary-only
  894. kernel modules.
  895. If you are not absolutely sure what you are doing, leave this
  896. option alone!
  897. config VMSPLIT_3G
  898. bool "3G/1G user/kernel split"
  899. config VMSPLIT_3G_OPT
  900. depends on !X86_PAE
  901. bool "3G/1G user/kernel split (for full 1G low memory)"
  902. config VMSPLIT_2G
  903. bool "2G/2G user/kernel split"
  904. config VMSPLIT_2G_OPT
  905. depends on !X86_PAE
  906. bool "2G/2G user/kernel split (for full 2G low memory)"
  907. config VMSPLIT_1G
  908. bool "1G/3G user/kernel split"
  909. endchoice
  910. config PAGE_OFFSET
  911. hex
  912. default 0xB0000000 if VMSPLIT_3G_OPT
  913. default 0x80000000 if VMSPLIT_2G
  914. default 0x78000000 if VMSPLIT_2G_OPT
  915. default 0x40000000 if VMSPLIT_1G
  916. default 0xC0000000
  917. depends on X86_32
  918. config HIGHMEM
  919. def_bool y
  920. depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
  921. config X86_PAE
  922. bool "PAE (Physical Address Extension) Support"
  923. depends on X86_32 && !HIGHMEM4G
  924. ---help---
  925. PAE is required for NX support, and furthermore enables
  926. larger swapspace support for non-overcommit purposes. It
  927. has the cost of more pagetable lookup overhead, and also
  928. consumes more pagetable space per process.
  929. config ARCH_PHYS_ADDR_T_64BIT
  930. def_bool X86_64 || X86_PAE
  931. config DIRECT_GBPAGES
  932. bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
  933. default y
  934. depends on X86_64
  935. ---help---
  936. Allow the kernel linear mapping to use 1GB pages on CPUs that
  937. support it. This can improve the kernel's performance a tiny bit by
  938. reducing TLB pressure. If in doubt, say "Y".
  939. # Common NUMA Features
  940. config NUMA
  941. bool "Numa Memory Allocation and Scheduler Support"
  942. depends on SMP
  943. depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
  944. default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
  945. ---help---
  946. Enable NUMA (Non Uniform Memory Access) support.
  947. The kernel will try to allocate memory used by a CPU on the
  948. local memory controller of the CPU and add some more
  949. NUMA awareness to the kernel.
  950. For 64-bit this is recommended if the system is Intel Core i7
  951. (or later), AMD Opteron, or EM64T NUMA.
  952. For 32-bit this is only needed on (rare) 32-bit-only platforms
  953. that support NUMA topologies, such as NUMAQ / Summit, or if you
  954. boot a 32-bit kernel on a 64-bit NUMA platform.
  955. Otherwise, you should say N.
  956. comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
  957. depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
  958. config K8_NUMA
  959. def_bool y
  960. prompt "Old style AMD Opteron NUMA detection"
  961. depends on X86_64 && NUMA && PCI
  962. ---help---
  963. Enable K8 NUMA node topology detection. You should say Y here if
  964. you have a multi processor AMD K8 system. This uses an old
  965. method to read the NUMA configuration directly from the builtin
  966. Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
  967. instead, which also takes priority if both are compiled in.
  968. config X86_64_ACPI_NUMA
  969. def_bool y
  970. prompt "ACPI NUMA detection"
  971. depends on X86_64 && NUMA && ACPI && PCI
  972. select ACPI_NUMA
  973. ---help---
  974. Enable ACPI SRAT based node topology detection.
  975. # Some NUMA nodes have memory ranges that span
  976. # other nodes. Even though a pfn is valid and
  977. # between a node's start and end pfns, it may not
  978. # reside on that node. See memmap_init_zone()
  979. # for details.
  980. config NODES_SPAN_OTHER_NODES
  981. def_bool y
  982. depends on X86_64_ACPI_NUMA
  983. config NUMA_EMU
  984. bool "NUMA emulation"
  985. depends on X86_64 && NUMA
  986. ---help---
  987. Enable NUMA emulation. A flat machine will be split
  988. into virtual nodes when booted with "numa=fake=N", where N is the
  989. number of nodes. This is only useful for debugging.
  990. config NODES_SHIFT
  991. int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
  992. range 1 9
  993. default "9" if MAXSMP
  994. default "6" if X86_64
  995. default "4" if X86_NUMAQ
  996. default "3"
  997. depends on NEED_MULTIPLE_NODES
  998. ---help---
  999. Specify the maximum number of NUMA Nodes available on the target
  1000. system. Increases memory reserved to accommodate various tables.
  1001. config HAVE_ARCH_BOOTMEM
  1002. def_bool y
  1003. depends on X86_32 && NUMA
  1004. config ARCH_HAVE_MEMORY_PRESENT
  1005. def_bool y
  1006. depends on X86_32 && DISCONTIGMEM
  1007. config NEED_NODE_MEMMAP_SIZE
  1008. def_bool y
  1009. depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
  1010. config HAVE_ARCH_ALLOC_REMAP
  1011. def_bool y
  1012. depends on X86_32 && NUMA
  1013. config ARCH_FLATMEM_ENABLE
  1014. def_bool y
  1015. depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
  1016. config ARCH_DISCONTIGMEM_ENABLE
  1017. def_bool y
  1018. depends on NUMA && X86_32
  1019. config ARCH_DISCONTIGMEM_DEFAULT
  1020. def_bool y
  1021. depends on NUMA && X86_32
  1022. config ARCH_SPARSEMEM_DEFAULT
  1023. def_bool y
  1024. depends on X86_64
  1025. config ARCH_SPARSEMEM_ENABLE
  1026. def_bool y
  1027. depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
  1028. select SPARSEMEM_STATIC if X86_32
  1029. select SPARSEMEM_VMEMMAP_ENABLE if X86_64
  1030. config ARCH_SELECT_MEMORY_MODEL
  1031. def_bool y
  1032. depends on ARCH_SPARSEMEM_ENABLE
  1033. config ARCH_MEMORY_PROBE
  1034. def_bool X86_64
  1035. depends on MEMORY_HOTPLUG
  1036. source "mm/Kconfig"
  1037. config HIGHPTE
  1038. bool "Allocate 3rd-level pagetables from highmem"
  1039. depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
  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_64K
  1072. bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
  1073. default y
  1074. ---help---
  1075. Reserve the first 64K of physical RAM on BIOSes that are known
  1076. to potentially corrupt that memory range. A numbers of BIOSes are
  1077. known to utilize this area during suspend/resume, so it must not
  1078. be used by the kernel.
  1079. Set this to N if you are absolutely sure that you trust the BIOS
  1080. to get all its memory reservations and usages right.
  1081. If you have doubts about the BIOS (e.g. suspend/resume does not
  1082. work or there's kernel crashes after certain hardware hotplug
  1083. events) and it's not AMI or Phoenix, then you might want to enable
  1084. X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
  1085. corruption patterns.
  1086. Say Y if unsure.
  1087. config MATH_EMULATION
  1088. bool
  1089. prompt "Math emulation" if X86_32
  1090. ---help---
  1091. Linux can emulate a math coprocessor (used for floating point
  1092. operations) if you don't have one. 486DX and Pentium processors have
  1093. a math coprocessor built in, 486SX and 386 do not, unless you added
  1094. a 487DX or 387, respectively. (The messages during boot time can
  1095. give you some hints here ["man dmesg"].) Everyone needs either a
  1096. coprocessor or this emulation.
  1097. If you don't have a math coprocessor, you need to say Y here; if you
  1098. say Y here even though you have a coprocessor, the coprocessor will
  1099. be used nevertheless. (This behavior can be changed with the kernel
  1100. command line option "no387", which comes handy if your coprocessor
  1101. is broken. Try "man bootparam" or see the documentation of your boot
  1102. loader (lilo or loadlin) about how to pass options to the kernel at
  1103. boot time.) This means that it is a good idea to say Y here if you
  1104. intend to use this kernel on different machines.
  1105. More information about the internals of the Linux math coprocessor
  1106. emulation can be found in <file:arch/x86/math-emu/README>.
  1107. If you are not sure, say Y; apart from resulting in a 66 KB bigger
  1108. kernel, it won't hurt.
  1109. config MTRR
  1110. bool "MTRR (Memory Type Range Register) support"
  1111. ---help---
  1112. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  1113. the Memory Type Range Registers (MTRRs) may be used to control
  1114. processor access to memory ranges. This is most useful if you have
  1115. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  1116. allows bus write transfers to be combined into a larger transfer
  1117. before bursting over the PCI/AGP bus. This can increase performance
  1118. of image write operations 2.5 times or more. Saying Y here creates a
  1119. /proc/mtrr file which may be used to manipulate your processor's
  1120. MTRRs. Typically the X server should use this.
  1121. This code has a reasonably generic interface so that similar
  1122. control registers on other processors can be easily supported
  1123. as well:
  1124. The Cyrix 6x86, 6x86MX and M II processors have Address Range
  1125. Registers (ARRs) which provide a similar functionality to MTRRs. For
  1126. these, the ARRs are used to emulate the MTRRs.
  1127. The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
  1128. MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
  1129. write-combining. All of these processors are supported by this code
  1130. and it makes sense to say Y here if you have one of them.
  1131. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  1132. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  1133. can lead to all sorts of problems, so it's good to say Y here.
  1134. You can safely say Y even if your machine doesn't have MTRRs, you'll
  1135. just add about 9 KB to your kernel.
  1136. See <file:Documentation/x86/mtrr.txt> for more information.
  1137. config MTRR_SANITIZER
  1138. def_bool y
  1139. prompt "MTRR cleanup support"
  1140. depends on MTRR
  1141. ---help---
  1142. Convert MTRR layout from continuous to discrete, so X drivers can
  1143. add writeback entries.
  1144. Can be disabled with disable_mtrr_cleanup on the kernel command line.
  1145. The largest mtrr entry size for a continuous block can be set with
  1146. mtrr_chunk_size.
  1147. If unsure, say Y.
  1148. config MTRR_SANITIZER_ENABLE_DEFAULT
  1149. int "MTRR cleanup enable value (0-1)"
  1150. range 0 1
  1151. default "0"
  1152. depends on MTRR_SANITIZER
  1153. ---help---
  1154. Enable mtrr cleanup default value
  1155. config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
  1156. int "MTRR cleanup spare reg num (0-7)"
  1157. range 0 7
  1158. default "1"
  1159. depends on MTRR_SANITIZER
  1160. ---help---
  1161. mtrr cleanup spare entries default, it can be changed via
  1162. mtrr_spare_reg_nr=N on the kernel command line.
  1163. config X86_PAT
  1164. bool
  1165. prompt "x86 PAT support"
  1166. depends on MTRR
  1167. ---help---
  1168. Use PAT attributes to setup page level cache control.
  1169. PATs are the modern equivalents of MTRRs and are much more
  1170. flexible than MTRRs.
  1171. Say N here if you see bootup problems (boot crash, boot hang,
  1172. spontaneous reboots) or a non-working video driver.
  1173. If unsure, say Y.
  1174. config EFI
  1175. bool "EFI runtime service support"
  1176. depends on ACPI
  1177. ---help---
  1178. This enables the kernel to use EFI runtime services that are
  1179. available (such as the EFI variable services).
  1180. This option is only useful on systems that have EFI firmware.
  1181. In addition, you should use the latest ELILO loader available
  1182. at <http://elilo.sourceforge.net> in order to take advantage
  1183. of EFI runtime services. However, even with this option, the
  1184. resultant kernel should continue to boot on existing non-EFI
  1185. platforms.
  1186. config SECCOMP
  1187. def_bool y
  1188. prompt "Enable seccomp to safely compute untrusted bytecode"
  1189. ---help---
  1190. This kernel feature is useful for number crunching applications
  1191. that may need to compute untrusted bytecode during their
  1192. execution. By using pipes or other transports made available to
  1193. the process as file descriptors supporting the read/write
  1194. syscalls, it's possible to isolate those applications in
  1195. their own address space using seccomp. Once seccomp is
  1196. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1197. and the task is only allowed to execute a few safe syscalls
  1198. defined by each seccomp mode.
  1199. If unsure, say Y. Only embedded should say N here.
  1200. config CC_STACKPROTECTOR_ALL
  1201. bool
  1202. config CC_STACKPROTECTOR
  1203. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1204. select CC_STACKPROTECTOR_ALL
  1205. ---help---
  1206. This option turns on the -fstack-protector GCC feature. This
  1207. feature puts, at the beginning of functions, a canary value on
  1208. the stack just before the return address, and validates
  1209. the value just before actually returning. Stack based buffer
  1210. overflows (that need to overwrite this return address) now also
  1211. overwrite the canary, which gets detected and the attack is then
  1212. neutralized via a kernel panic.
  1213. This feature requires gcc version 4.2 or above, or a distribution
  1214. gcc with the feature backported. Older versions are automatically
  1215. detected and for those versions, this configuration option is
  1216. ignored. (and a warning is printed during bootup)
  1217. source kernel/Kconfig.hz
  1218. config KEXEC
  1219. bool "kexec system call"
  1220. ---help---
  1221. kexec is a system call that implements the ability to shutdown your
  1222. current kernel, and to start another kernel. It is like a reboot
  1223. but it is independent of the system firmware. And like a reboot
  1224. you can start any kernel with it, not just Linux.
  1225. The name comes from the similarity to the exec system call.
  1226. It is an ongoing process to be certain the hardware in a machine
  1227. is properly shutdown, so do not be surprised if this code does not
  1228. initially work for you. It may help to enable device hotplugging
  1229. support. As of this writing the exact hardware interface is
  1230. strongly in flux, so no good recommendation can be made.
  1231. config CRASH_DUMP
  1232. bool "kernel crash dumps"
  1233. depends on X86_64 || (X86_32 && HIGHMEM)
  1234. ---help---
  1235. Generate crash dump after being started by kexec.
  1236. This should be normally only set in special crash dump kernels
  1237. which are loaded in the main kernel with kexec-tools into
  1238. a specially reserved region and then later executed after
  1239. a crash by kdump/kexec. The crash dump kernel must be compiled
  1240. to a memory address not used by the main kernel or BIOS using
  1241. PHYSICAL_START, or it must be built as a relocatable image
  1242. (CONFIG_RELOCATABLE=y).
  1243. For more details see Documentation/kdump/kdump.txt
  1244. config KEXEC_JUMP
  1245. bool "kexec jump (EXPERIMENTAL)"
  1246. depends on EXPERIMENTAL
  1247. depends on KEXEC && HIBERNATION
  1248. ---help---
  1249. Jump between original kernel and kexeced kernel and invoke
  1250. code in physical address mode via KEXEC
  1251. config PHYSICAL_START
  1252. hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
  1253. default "0x1000000"
  1254. ---help---
  1255. This gives the physical address where the kernel is loaded.
  1256. If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
  1257. bzImage will decompress itself to above physical address and
  1258. run from there. Otherwise, bzImage will run from the address where
  1259. it has been loaded by the boot loader and will ignore above physical
  1260. address.
  1261. In normal kdump cases one does not have to set/change this option
  1262. as now bzImage can be compiled as a completely relocatable image
  1263. (CONFIG_RELOCATABLE=y) and be used to load and run from a different
  1264. address. This option is mainly useful for the folks who don't want
  1265. to use a bzImage for capturing the crash dump and want to use a
  1266. vmlinux instead. vmlinux is not relocatable hence a kernel needs
  1267. to be specifically compiled to run from a specific memory area
  1268. (normally a reserved region) and this option comes handy.
  1269. So if you are using bzImage for capturing the crash dump,
  1270. leave the value here unchanged to 0x1000000 and set
  1271. CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
  1272. for capturing the crash dump change this value to start of
  1273. the reserved region. In other words, it can be set based on
  1274. the "X" value as specified in the "crashkernel=YM@XM"
  1275. command line boot parameter passed to the panic-ed
  1276. kernel. Please take a look at Documentation/kdump/kdump.txt
  1277. for more details about crash dumps.
  1278. Usage of bzImage for capturing the crash dump is recommended as
  1279. one does not have to build two kernels. Same kernel can be used
  1280. as production kernel and capture kernel. Above option should have
  1281. gone away after relocatable bzImage support is introduced. But it
  1282. is present because there are users out there who continue to use
  1283. vmlinux for dump capture. This option should go away down the
  1284. line.
  1285. Don't change this unless you know what you are doing.
  1286. config RELOCATABLE
  1287. bool "Build a relocatable kernel"
  1288. default y
  1289. ---help---
  1290. This builds a kernel image that retains relocation information
  1291. so it can be loaded someplace besides the default 1MB.
  1292. The relocations tend to make the kernel binary about 10% larger,
  1293. but are discarded at runtime.
  1294. One use is for the kexec on panic case where the recovery kernel
  1295. must live at a different physical address than the primary
  1296. kernel.
  1297. Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
  1298. it has been loaded at and the compile time physical address
  1299. (CONFIG_PHYSICAL_START) is ignored.
  1300. # Relocation on x86-32 needs some additional build support
  1301. config X86_NEED_RELOCS
  1302. def_bool y
  1303. depends on X86_32 && RELOCATABLE
  1304. config PHYSICAL_ALIGN
  1305. hex
  1306. prompt "Alignment value to which kernel should be aligned" if X86_32
  1307. default "0x1000000"
  1308. range 0x2000 0x1000000
  1309. ---help---
  1310. This value puts the alignment restrictions on physical address
  1311. where kernel is loaded and run from. Kernel is compiled for an
  1312. address which meets above alignment restriction.
  1313. If bootloader loads the kernel at a non-aligned address and
  1314. CONFIG_RELOCATABLE is set, kernel will move itself to nearest
  1315. address aligned to above value and run from there.
  1316. If bootloader loads the kernel at a non-aligned address and
  1317. CONFIG_RELOCATABLE is not set, kernel will ignore the run time
  1318. load address and decompress itself to the address it has been
  1319. compiled for and run from there. The address for which kernel is
  1320. compiled already meets above alignment restrictions. Hence the
  1321. end result is that kernel runs from a physical address meeting
  1322. above alignment restrictions.
  1323. Don't change this unless you know what you are doing.
  1324. config HOTPLUG_CPU
  1325. bool "Support for hot-pluggable CPUs"
  1326. depends on SMP && HOTPLUG
  1327. ---help---
  1328. Say Y here to allow turning CPUs off and on. CPUs can be
  1329. controlled through /sys/devices/system/cpu.
  1330. ( Note: power management support will enable this option
  1331. automatically on SMP systems. )
  1332. Say N if you want to disable CPU hotplug.
  1333. config COMPAT_VDSO
  1334. def_bool y
  1335. prompt "Compat VDSO support"
  1336. depends on X86_32 || IA32_EMULATION
  1337. ---help---
  1338. Map the 32-bit VDSO to the predictable old-style address too.
  1339. ---help---
  1340. Say N here if you are running a sufficiently recent glibc
  1341. version (2.3.3 or later), to remove the high-mapped
  1342. VDSO mapping and to exclusively use the randomized VDSO.
  1343. If unsure, say Y.
  1344. config CMDLINE_BOOL
  1345. bool "Built-in kernel command line"
  1346. default n
  1347. ---help---
  1348. Allow for specifying boot arguments to the kernel at
  1349. build time. On some systems (e.g. embedded ones), it is
  1350. necessary or convenient to provide some or all of the
  1351. kernel boot arguments with the kernel itself (that is,
  1352. to not rely on the boot loader to provide them.)
  1353. To compile command line arguments into the kernel,
  1354. set this option to 'Y', then fill in the
  1355. the boot arguments in CONFIG_CMDLINE.
  1356. Systems with fully functional boot loaders (i.e. non-embedded)
  1357. should leave this option set to 'N'.
  1358. config CMDLINE
  1359. string "Built-in kernel command string"
  1360. depends on CMDLINE_BOOL
  1361. default ""
  1362. ---help---
  1363. Enter arguments here that should be compiled into the kernel
  1364. image and used at boot time. If the boot loader provides a
  1365. command line at boot time, it is appended to this string to
  1366. form the full kernel command line, when the system boots.
  1367. However, you can use the CONFIG_CMDLINE_OVERRIDE option to
  1368. change this behavior.
  1369. In most cases, the command line (whether built-in or provided
  1370. by the boot loader) should specify the device for the root
  1371. file system.
  1372. config CMDLINE_OVERRIDE
  1373. bool "Built-in command line overrides boot loader arguments"
  1374. default n
  1375. depends on CMDLINE_BOOL
  1376. ---help---
  1377. Set this option to 'Y' to have the kernel ignore the boot loader
  1378. command line, and use ONLY the built-in command line.
  1379. This is used to work around broken boot loaders. This should
  1380. be set to 'N' under normal conditions.
  1381. endmenu
  1382. config ARCH_ENABLE_MEMORY_HOTPLUG
  1383. def_bool y
  1384. depends on X86_64 || (X86_32 && HIGHMEM)
  1385. config ARCH_ENABLE_MEMORY_HOTREMOVE
  1386. def_bool y
  1387. depends on MEMORY_HOTPLUG
  1388. config HAVE_ARCH_EARLY_PFN_TO_NID
  1389. def_bool X86_64
  1390. depends on NUMA
  1391. menu "Power management and ACPI options"
  1392. config ARCH_HIBERNATION_HEADER
  1393. def_bool y
  1394. depends on X86_64 && HIBERNATION
  1395. source "kernel/power/Kconfig"
  1396. source "drivers/acpi/Kconfig"
  1397. config X86_APM_BOOT
  1398. bool
  1399. default y
  1400. depends on APM || APM_MODULE
  1401. menuconfig APM
  1402. tristate "APM (Advanced Power Management) BIOS support"
  1403. depends on X86_32 && PM_SLEEP
  1404. ---help---
  1405. APM is a BIOS specification for saving power using several different
  1406. techniques. This is mostly useful for battery powered laptops with
  1407. APM compliant BIOSes. If you say Y here, the system time will be
  1408. reset after a RESUME operation, the /proc/apm device will provide
  1409. battery status information, and user-space programs will receive
  1410. notification of APM "events" (e.g. battery status change).
  1411. If you select "Y" here, you can disable actual use of the APM
  1412. BIOS by passing the "apm=off" option to the kernel at boot time.
  1413. Note that the APM support is almost completely disabled for
  1414. machines with more than one CPU.
  1415. In order to use APM, you will need supporting software. For location
  1416. and more information, read <file:Documentation/power/pm.txt> and the
  1417. Battery Powered Linux mini-HOWTO, available from
  1418. <http://www.tldp.org/docs.html#howto>.
  1419. This driver does not spin down disk drives (see the hdparm(8)
  1420. manpage ("man 8 hdparm") for that), and it doesn't turn off
  1421. VESA-compliant "green" monitors.
  1422. This driver does not support the TI 4000M TravelMate and the ACER
  1423. 486/DX4/75 because they don't have compliant BIOSes. Many "green"
  1424. desktop machines also don't have compliant BIOSes, and this driver
  1425. may cause those machines to panic during the boot phase.
  1426. Generally, if you don't have a battery in your machine, there isn't
  1427. much point in using this driver and you should say N. If you get
  1428. random kernel OOPSes or reboots that don't seem to be related to
  1429. anything, try disabling/enabling this option (or disabling/enabling
  1430. APM in your BIOS).
  1431. Some other things you should try when experiencing seemingly random,
  1432. "weird" problems:
  1433. 1) make sure that you have enough swap space and that it is
  1434. enabled.
  1435. 2) pass the "no-hlt" option to the kernel
  1436. 3) switch on floating point emulation in the kernel and pass
  1437. the "no387" option to the kernel
  1438. 4) pass the "floppy=nodma" option to the kernel
  1439. 5) pass the "mem=4M" option to the kernel (thereby disabling
  1440. all but the first 4 MB of RAM)
  1441. 6) make sure that the CPU is not over clocked.
  1442. 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
  1443. 8) disable the cache from your BIOS settings
  1444. 9) install a fan for the video card or exchange video RAM
  1445. 10) install a better fan for the CPU
  1446. 11) exchange RAM chips
  1447. 12) exchange the motherboard.
  1448. To compile this driver as a module, choose M here: the
  1449. module will be called apm.
  1450. if APM
  1451. config APM_IGNORE_USER_SUSPEND
  1452. bool "Ignore USER SUSPEND"
  1453. ---help---
  1454. This option will ignore USER SUSPEND requests. On machines with a
  1455. compliant APM BIOS, you want to say N. However, on the NEC Versa M
  1456. series notebooks, it is necessary to say Y because of a BIOS bug.
  1457. config APM_DO_ENABLE
  1458. bool "Enable PM at boot time"
  1459. ---help---
  1460. Enable APM features at boot time. From page 36 of the APM BIOS
  1461. specification: "When disabled, the APM BIOS does not automatically
  1462. power manage devices, enter the Standby State, enter the Suspend
  1463. State, or take power saving steps in response to CPU Idle calls."
  1464. This driver will make CPU Idle calls when Linux is idle (unless this
  1465. feature is turned off -- see "Do CPU IDLE calls", below). This
  1466. should always save battery power, but more complicated APM features
  1467. will be dependent on your BIOS implementation. You may need to turn
  1468. this option off if your computer hangs at boot time when using APM
  1469. support, or if it beeps continuously instead of suspending. Turn
  1470. this off if you have a NEC UltraLite Versa 33/C or a Toshiba
  1471. T400CDT. This is off by default since most machines do fine without
  1472. this feature.
  1473. config APM_CPU_IDLE
  1474. bool "Make CPU Idle calls when idle"
  1475. ---help---
  1476. Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
  1477. On some machines, this can activate improved power savings, such as
  1478. a slowed CPU clock rate, when the machine is idle. These idle calls
  1479. are made after the idle loop has run for some length of time (e.g.,
  1480. 333 mS). On some machines, this will cause a hang at boot time or
  1481. whenever the CPU becomes idle. (On machines with more than one CPU,
  1482. this option does nothing.)
  1483. config APM_DISPLAY_BLANK
  1484. bool "Enable console blanking using APM"
  1485. ---help---
  1486. Enable console blanking using the APM. Some laptops can use this to
  1487. turn off the LCD backlight when the screen blanker of the Linux
  1488. virtual console blanks the screen. Note that this is only used by
  1489. the virtual console screen blanker, and won't turn off the backlight
  1490. when using the X Window system. This also doesn't have anything to
  1491. do with your VESA-compliant power-saving monitor. Further, this
  1492. option doesn't work for all laptops -- it might not turn off your
  1493. backlight at all, or it might print a lot of errors to the console,
  1494. especially if you are using gpm.
  1495. config APM_ALLOW_INTS
  1496. bool "Allow interrupts during APM BIOS calls"
  1497. ---help---
  1498. Normally we disable external interrupts while we are making calls to
  1499. the APM BIOS as a measure to lessen the effects of a badly behaving
  1500. BIOS implementation. The BIOS should reenable interrupts if it
  1501. needs to. Unfortunately, some BIOSes do not -- especially those in
  1502. many of the newer IBM Thinkpads. If you experience hangs when you
  1503. suspend, try setting this to Y. Otherwise, say N.
  1504. endif # APM
  1505. source "arch/x86/kernel/cpu/cpufreq/Kconfig"
  1506. source "drivers/cpuidle/Kconfig"
  1507. source "drivers/idle/Kconfig"
  1508. endmenu
  1509. menu "Bus options (PCI etc.)"
  1510. config PCI
  1511. bool "PCI support"
  1512. default y
  1513. select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
  1514. ---help---
  1515. Find out whether you have a PCI motherboard. PCI is the name of a
  1516. bus system, i.e. the way the CPU talks to the other stuff inside
  1517. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1518. VESA. If you have PCI, say Y, otherwise N.
  1519. choice
  1520. prompt "PCI access mode"
  1521. depends on X86_32 && PCI
  1522. default PCI_GOANY
  1523. ---help---
  1524. On PCI systems, the BIOS can be used to detect the PCI devices and
  1525. determine their configuration. However, some old PCI motherboards
  1526. have BIOS bugs and may crash if this is done. Also, some embedded
  1527. PCI-based systems don't have any BIOS at all. Linux can also try to
  1528. detect the PCI hardware directly without using the BIOS.
  1529. With this option, you can specify how Linux should detect the
  1530. PCI devices. If you choose "BIOS", the BIOS will be used,
  1531. if you choose "Direct", the BIOS won't be used, and if you
  1532. choose "MMConfig", then PCI Express MMCONFIG will be used.
  1533. If you choose "Any", the kernel will try MMCONFIG, then the
  1534. direct access method and falls back to the BIOS if that doesn't
  1535. work. If unsure, go with the default, which is "Any".
  1536. config PCI_GOBIOS
  1537. bool "BIOS"
  1538. config PCI_GOMMCONFIG
  1539. bool "MMConfig"
  1540. config PCI_GODIRECT
  1541. bool "Direct"
  1542. config PCI_GOOLPC
  1543. bool "OLPC"
  1544. depends on OLPC
  1545. config PCI_GOANY
  1546. bool "Any"
  1547. endchoice
  1548. config PCI_BIOS
  1549. def_bool y
  1550. depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
  1551. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  1552. config PCI_DIRECT
  1553. def_bool y
  1554. depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
  1555. config PCI_MMCONFIG
  1556. def_bool y
  1557. depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
  1558. config PCI_OLPC
  1559. def_bool y
  1560. depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
  1561. config PCI_DOMAINS
  1562. def_bool y
  1563. depends on PCI
  1564. config PCI_MMCONFIG
  1565. bool "Support mmconfig PCI config space access"
  1566. depends on X86_64 && PCI && ACPI
  1567. config DMAR
  1568. bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
  1569. depends on PCI_MSI && ACPI && EXPERIMENTAL
  1570. help
  1571. DMA remapping (DMAR) devices support enables independent address
  1572. translations for Direct Memory Access (DMA) from devices.
  1573. These DMA remapping devices are reported via ACPI tables
  1574. and include PCI device scope covered by these DMA
  1575. remapping devices.
  1576. config DMAR_DEFAULT_ON
  1577. def_bool y
  1578. prompt "Enable DMA Remapping Devices by default"
  1579. depends on DMAR
  1580. help
  1581. Selecting this option will enable a DMAR device at boot time if
  1582. one is found. If this option is not selected, DMAR support can
  1583. be enabled by passing intel_iommu=on to the kernel. It is
  1584. recommended you say N here while the DMAR code remains
  1585. experimental.
  1586. config DMAR_BROKEN_GFX_WA
  1587. def_bool n
  1588. prompt "Workaround broken graphics drivers (going away soon)"
  1589. depends on DMAR
  1590. ---help---
  1591. Current Graphics drivers tend to use physical address
  1592. for DMA and avoid using DMA APIs. Setting this config
  1593. option permits the IOMMU driver to set a unity map for
  1594. all the OS-visible memory. Hence the driver can continue
  1595. to use physical addresses for DMA, at least until this
  1596. option is removed in the 2.6.32 kernel.
  1597. config DMAR_FLOPPY_WA
  1598. def_bool y
  1599. depends on DMAR
  1600. ---help---
  1601. Floppy disk drivers are known to bypass DMA API calls
  1602. thereby failing to work when IOMMU is enabled. This
  1603. workaround will setup a 1:1 mapping for the first
  1604. 16MiB to make floppy (an ISA device) work.
  1605. config INTR_REMAP
  1606. bool "Support for Interrupt Remapping (EXPERIMENTAL)"
  1607. depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
  1608. ---help---
  1609. Supports Interrupt remapping for IO-APIC and MSI devices.
  1610. To use x2apic mode in the CPU's which support x2APIC enhancements or
  1611. to support platforms with CPU's having > 8 bit APIC ID, say Y.
  1612. source "drivers/pci/pcie/Kconfig"
  1613. source "drivers/pci/Kconfig"
  1614. # x86_64 have no ISA slots, but do have ISA-style DMA.
  1615. config ISA_DMA_API
  1616. def_bool y
  1617. if X86_32
  1618. config ISA
  1619. bool "ISA support"
  1620. ---help---
  1621. Find out whether you have ISA slots on your motherboard. ISA is the
  1622. name of a bus system, i.e. the way the CPU talks to the other stuff
  1623. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1624. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1625. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1626. config EISA
  1627. bool "EISA support"
  1628. depends on ISA
  1629. ---help---
  1630. The Extended Industry Standard Architecture (EISA) bus was
  1631. developed as an open alternative to the IBM MicroChannel bus.
  1632. The EISA bus provided some of the features of the IBM MicroChannel
  1633. bus while maintaining backward compatibility with cards made for
  1634. the older ISA bus. The EISA bus saw limited use between 1988 and
  1635. 1995 when it was made obsolete by the PCI bus.
  1636. Say Y here if you are building a kernel for an EISA-based machine.
  1637. Otherwise, say N.
  1638. source "drivers/eisa/Kconfig"
  1639. config MCA
  1640. bool "MCA support"
  1641. ---help---
  1642. MicroChannel Architecture is found in some IBM PS/2 machines and
  1643. laptops. It is a bus system similar to PCI or ISA. See
  1644. <file:Documentation/mca.txt> (and especially the web page given
  1645. there) before attempting to build an MCA bus kernel.
  1646. source "drivers/mca/Kconfig"
  1647. config SCx200
  1648. tristate "NatSemi SCx200 support"
  1649. ---help---
  1650. This provides basic support for National Semiconductor's
  1651. (now AMD's) Geode processors. The driver probes for the
  1652. PCI-IDs of several on-chip devices, so its a good dependency
  1653. for other scx200_* drivers.
  1654. If compiled as a module, the driver is named scx200.
  1655. config SCx200HR_TIMER
  1656. tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
  1657. depends on SCx200 && GENERIC_TIME
  1658. default y
  1659. ---help---
  1660. This driver provides a clocksource built upon the on-chip
  1661. 27MHz high-resolution timer. Its also a workaround for
  1662. NSC Geode SC-1100's buggy TSC, which loses time when the
  1663. processor goes idle (as is done by the scheduler). The
  1664. other workaround is idle=poll boot option.
  1665. config GEODE_MFGPT_TIMER
  1666. def_bool y
  1667. prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
  1668. depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
  1669. ---help---
  1670. This driver provides a clock event source based on the MFGPT
  1671. timer(s) in the CS5535 and CS5536 companion chip for the geode.
  1672. MFGPTs have a better resolution and max interval than the
  1673. generic PIT, and are suitable for use as high-res timers.
  1674. config OLPC
  1675. bool "One Laptop Per Child support"
  1676. default n
  1677. ---help---
  1678. Add support for detecting the unique features of the OLPC
  1679. XO hardware.
  1680. endif # X86_32
  1681. config K8_NB
  1682. def_bool y
  1683. depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
  1684. source "drivers/pcmcia/Kconfig"
  1685. source "drivers/pci/hotplug/Kconfig"
  1686. endmenu
  1687. menu "Executable file formats / Emulations"
  1688. source "fs/Kconfig.binfmt"
  1689. config IA32_EMULATION
  1690. bool "IA32 Emulation"
  1691. depends on X86_64
  1692. select COMPAT_BINFMT_ELF
  1693. ---help---
  1694. Include code to run 32-bit programs under a 64-bit kernel. You should
  1695. likely turn this on, unless you're 100% sure that you don't have any
  1696. 32-bit programs left.
  1697. config IA32_AOUT
  1698. tristate "IA32 a.out support"
  1699. depends on IA32_EMULATION
  1700. ---help---
  1701. Support old a.out binaries in the 32bit emulation.
  1702. config COMPAT
  1703. def_bool y
  1704. depends on IA32_EMULATION
  1705. config COMPAT_FOR_U64_ALIGNMENT
  1706. def_bool COMPAT
  1707. depends on X86_64
  1708. config SYSVIPC_COMPAT
  1709. def_bool y
  1710. depends on COMPAT && SYSVIPC
  1711. endmenu
  1712. config HAVE_ATOMIC_IOMAP
  1713. def_bool y
  1714. depends on X86_32
  1715. source "net/Kconfig"
  1716. source "drivers/Kconfig"
  1717. source "drivers/firmware/Kconfig"
  1718. source "fs/Kconfig"
  1719. source "arch/x86/Kconfig.debug"
  1720. source "security/Kconfig"
  1721. source "crypto/Kconfig"
  1722. source "arch/x86/kvm/Kconfig"
  1723. source "lib/Kconfig"