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