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