Kconfig 64 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 if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
  34. select HAVE_ARCH_KGDB if !X86_VOYAGER
  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. config ARCH_DEFCONFIG
  40. string
  41. default "arch/x86/configs/i386_defconfig" if X86_32
  42. default "arch/x86/configs/x86_64_defconfig" if X86_64
  43. config GENERIC_TIME
  44. def_bool y
  45. config GENERIC_CMOS_UPDATE
  46. def_bool y
  47. config CLOCKSOURCE_WATCHDOG
  48. def_bool y
  49. config GENERIC_CLOCKEVENTS
  50. def_bool y
  51. config GENERIC_CLOCKEVENTS_BROADCAST
  52. def_bool y
  53. depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
  54. config LOCKDEP_SUPPORT
  55. def_bool y
  56. config STACKTRACE_SUPPORT
  57. def_bool y
  58. config HAVE_LATENCYTOP_SUPPORT
  59. def_bool y
  60. config FAST_CMPXCHG_LOCAL
  61. bool
  62. default y
  63. config MMU
  64. def_bool y
  65. config ZONE_DMA
  66. def_bool y
  67. config SBUS
  68. bool
  69. config GENERIC_ISA_DMA
  70. def_bool y
  71. config GENERIC_IOMAP
  72. def_bool y
  73. config GENERIC_BUG
  74. def_bool y
  75. depends on BUG
  76. select GENERIC_BUG_RELATIVE_POINTERS if X86_64
  77. config GENERIC_BUG_RELATIVE_POINTERS
  78. bool
  79. config GENERIC_HWEIGHT
  80. def_bool y
  81. config GENERIC_GPIO
  82. bool
  83. config ARCH_MAY_HAVE_PC_FDC
  84. def_bool y
  85. config RWSEM_GENERIC_SPINLOCK
  86. def_bool !X86_XADD
  87. config RWSEM_XCHGADD_ALGORITHM
  88. def_bool X86_XADD
  89. config ARCH_HAS_CPU_IDLE_WAIT
  90. def_bool y
  91. config GENERIC_CALIBRATE_DELAY
  92. def_bool y
  93. config GENERIC_TIME_VSYSCALL
  94. bool
  95. default X86_64
  96. config ARCH_HAS_CPU_RELAX
  97. def_bool y
  98. config ARCH_HAS_DEFAULT_IDLE
  99. def_bool y
  100. config ARCH_HAS_CACHE_LINE_SIZE
  101. def_bool y
  102. config HAVE_SETUP_PER_CPU_AREA
  103. def_bool X86_64_SMP || (X86_SMP && !X86_VOYAGER)
  104. config HAVE_CPUMASK_OF_CPU_MAP
  105. def_bool X86_64_SMP
  106. config ARCH_HIBERNATION_POSSIBLE
  107. def_bool y
  108. depends on !SMP || !X86_VOYAGER
  109. config ARCH_SUSPEND_POSSIBLE
  110. def_bool y
  111. depends on !X86_VOYAGER
  112. config ZONE_DMA32
  113. bool
  114. default X86_64
  115. config ARCH_POPULATES_NODE_MAP
  116. def_bool y
  117. config AUDIT_ARCH
  118. bool
  119. default X86_64
  120. config ARCH_SUPPORTS_OPTIMIZED_INLINING
  121. def_bool y
  122. # Use the generic interrupt handling code in kernel/irq/:
  123. config GENERIC_HARDIRQS
  124. bool
  125. default y
  126. config GENERIC_IRQ_PROBE
  127. bool
  128. default y
  129. config GENERIC_PENDING_IRQ
  130. bool
  131. depends on GENERIC_HARDIRQS && SMP
  132. default y
  133. config X86_SMP
  134. bool
  135. depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
  136. default y
  137. config USE_GENERIC_SMP_HELPERS
  138. def_bool y
  139. depends on SMP
  140. config X86_32_SMP
  141. def_bool y
  142. depends on X86_32 && SMP
  143. config X86_64_SMP
  144. def_bool y
  145. depends on X86_64 && SMP
  146. config X86_HT
  147. bool
  148. depends on SMP
  149. depends on (X86_32 && !X86_VOYAGER) || X86_64
  150. default y
  151. config X86_BIOS_REBOOT
  152. bool
  153. depends on !X86_VOYAGER
  154. default y
  155. config X86_TRAMPOLINE
  156. bool
  157. depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
  158. default y
  159. config KTIME_SCALAR
  160. def_bool X86_32
  161. source "init/Kconfig"
  162. source "kernel/Kconfig.freezer"
  163. menu "Processor type and features"
  164. source "kernel/time/Kconfig"
  165. config SMP
  166. bool "Symmetric multi-processing support"
  167. ---help---
  168. This enables support for systems with more than one CPU. If you have
  169. a system with only one CPU, like most personal computers, say N. If
  170. you have a system with more than one CPU, say Y.
  171. If you say N here, the kernel will run on single and multiprocessor
  172. machines, but will use only one CPU of a multiprocessor machine. If
  173. you say Y here, the kernel will run on many, but not all,
  174. singleprocessor machines. On a singleprocessor machine, the kernel
  175. will run faster if you say N here.
  176. Note that if you say Y here and choose architecture "586" or
  177. "Pentium" under "Processor family", the kernel will not work on 486
  178. architectures. Similarly, multiprocessor kernels for the "PPro"
  179. architecture may not work on all Pentium based boards.
  180. People using multiprocessor machines who say Y here should also say
  181. Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
  182. Management" code will be disabled if you say Y here.
  183. See also <file:Documentation/i386/IO-APIC.txt>,
  184. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  185. <http://www.tldp.org/docs.html#howto>.
  186. If you don't know what to do here, say N.
  187. config X86_HAS_BOOT_CPU_ID
  188. def_bool y
  189. depends on X86_VOYAGER
  190. config SPARSE_IRQ
  191. bool "Support sparse irq numbering"
  192. depends on PCI_MSI || HT_IRQ
  193. help
  194. This enables support for sparse irqs. This is useful for distro
  195. kernels that want to define a high CONFIG_NR_CPUS value but still
  196. want to have low kernel memory footprint on smaller machines.
  197. ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
  198. out the irq_desc[] array in a more NUMA-friendly way. )
  199. If you don't know what to do here, say N.
  200. config NUMA_MIGRATE_IRQ_DESC
  201. bool "Move irq desc when changing irq smp_affinity"
  202. depends on SPARSE_IRQ && NUMA
  203. default n
  204. help
  205. This enables moving irq_desc to cpu/node that irq will use handled.
  206. If you don't know what to do here, say N.
  207. config X86_FIND_SMP_CONFIG
  208. def_bool y
  209. depends on X86_MPPARSE || X86_VOYAGER
  210. config X86_MPPARSE
  211. bool "Enable MPS table" if ACPI
  212. default y
  213. depends on X86_LOCAL_APIC
  214. help
  215. For old smp systems that do not have proper acpi support. Newer systems
  216. (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
  217. choice
  218. prompt "Subarchitecture Type"
  219. default X86_PC
  220. config X86_PC
  221. bool "PC-compatible"
  222. help
  223. Choose this option if your computer is a standard PC or compatible.
  224. config X86_ELAN
  225. bool "AMD Elan"
  226. depends on X86_32
  227. help
  228. Select this for an AMD Elan processor.
  229. Do not use this option for K6/Athlon/Opteron processors!
  230. If unsure, choose "PC-compatible" instead.
  231. config X86_VOYAGER
  232. bool "Voyager (NCR)"
  233. depends on X86_32 && (SMP || BROKEN) && !PCI
  234. help
  235. Voyager is an MCA-based 32-way capable SMP architecture proprietary
  236. to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
  237. *** WARNING ***
  238. If you do not specifically know you have a Voyager based machine,
  239. say N here, otherwise the kernel you build will not be bootable.
  240. config X86_GENERICARCH
  241. bool "Generic architecture"
  242. depends on X86_32
  243. help
  244. This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
  245. subarchitectures. It is intended for a generic binary kernel.
  246. if you select them all, kernel will probe it one by one. and will
  247. fallback to default.
  248. if X86_GENERICARCH
  249. config X86_NUMAQ
  250. bool "NUMAQ (IBM/Sequent)"
  251. depends on SMP && X86_32 && PCI && X86_MPPARSE
  252. select NUMA
  253. help
  254. This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
  255. NUMA multiquad box. This changes the way that processors are
  256. bootstrapped, and uses Clustered Logical APIC addressing mode instead
  257. of Flat Logical. You will need a new lynxer.elf file to flash your
  258. firmware with - send email to <Martin.Bligh@us.ibm.com>.
  259. config X86_SUMMIT
  260. bool "Summit/EXA (IBM x440)"
  261. depends on X86_32 && SMP
  262. help
  263. This option is needed for IBM systems that use the Summit/EXA chipset.
  264. In particular, it is needed for the x440.
  265. config X86_ES7000
  266. bool "Support for Unisys ES7000 IA32 series"
  267. depends on X86_32 && SMP
  268. help
  269. Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
  270. supposed to run on an IA32-based Unisys ES7000 system.
  271. config X86_BIGSMP
  272. bool "Support for big SMP systems with more than 8 CPUs"
  273. depends on X86_32 && SMP
  274. help
  275. This option is needed for the systems that have more than 8 CPUs
  276. and if the system is not of any sub-arch type above.
  277. endif
  278. config X86_VSMP
  279. bool "Support for ScaleMP vSMP"
  280. select PARAVIRT
  281. depends on X86_64 && PCI
  282. help
  283. Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
  284. supposed to run on these EM64T-based machines. Only choose this option
  285. if you have one of these machines.
  286. endchoice
  287. config X86_VISWS
  288. bool "SGI 320/540 (Visual Workstation)"
  289. depends on X86_32 && PCI && !X86_VOYAGER && X86_MPPARSE && PCI_GODIRECT
  290. help
  291. The SGI Visual Workstation series is an IA32-based workstation
  292. based on SGI systems chips with some legacy PC hardware attached.
  293. Say Y here to create a kernel to run on the SGI 320 or 540.
  294. A kernel compiled for the Visual Workstation will run on general
  295. PCs as well. See <file:Documentation/sgi-visws.txt> for details.
  296. config X86_RDC321X
  297. bool "RDC R-321x SoC"
  298. depends on X86_32
  299. select M486
  300. select X86_REBOOTFIXUPS
  301. help
  302. This option is needed for RDC R-321x system-on-chip, also known
  303. as R-8610-(G).
  304. If you don't have one of these chips, you should say N here.
  305. config SCHED_OMIT_FRAME_POINTER
  306. def_bool y
  307. prompt "Single-depth WCHAN output"
  308. depends on X86
  309. help
  310. Calculate simpler /proc/<PID>/wchan values. If this option
  311. is disabled then wchan values will recurse back to the
  312. caller function. This provides more accurate wchan values,
  313. at the expense of slightly more scheduling overhead.
  314. If in doubt, say "Y".
  315. menuconfig PARAVIRT_GUEST
  316. bool "Paravirtualized guest support"
  317. help
  318. Say Y here to get to see options related to running Linux under
  319. various hypervisors. This option alone does not add any kernel code.
  320. If you say N, all options in this submenu will be skipped and disabled.
  321. if PARAVIRT_GUEST
  322. source "arch/x86/xen/Kconfig"
  323. config VMI
  324. bool "VMI Guest support"
  325. select PARAVIRT
  326. depends on X86_32
  327. depends on !X86_VOYAGER
  328. help
  329. VMI provides a paravirtualized interface to the VMware ESX server
  330. (it could be used by other hypervisors in theory too, but is not
  331. at the moment), by linking the kernel to a GPL-ed ROM module
  332. provided by the hypervisor.
  333. config KVM_CLOCK
  334. bool "KVM paravirtualized clock"
  335. select PARAVIRT
  336. select PARAVIRT_CLOCK
  337. depends on !X86_VOYAGER
  338. help
  339. Turning on this option will allow you to run a paravirtualized clock
  340. when running over the KVM hypervisor. Instead of relying on a PIT
  341. (or probably other) emulation by the underlying device model, the host
  342. provides the guest with timing infrastructure such as time of day, and
  343. system time
  344. config KVM_GUEST
  345. bool "KVM Guest support"
  346. select PARAVIRT
  347. depends on !X86_VOYAGER
  348. help
  349. This option enables various optimizations for running under the KVM
  350. hypervisor.
  351. source "arch/x86/lguest/Kconfig"
  352. config PARAVIRT
  353. bool "Enable paravirtualization code"
  354. depends on !X86_VOYAGER
  355. help
  356. This changes the kernel so it can modify itself when it is run
  357. under a hypervisor, potentially improving performance significantly
  358. over full virtualization. However, when run without a hypervisor
  359. the kernel is theoretically slower and slightly larger.
  360. config PARAVIRT_CLOCK
  361. bool
  362. default n
  363. endif
  364. config PARAVIRT_DEBUG
  365. bool "paravirt-ops debugging"
  366. depends on PARAVIRT && DEBUG_KERNEL
  367. help
  368. Enable to debug paravirt_ops internals. Specifically, BUG if
  369. a paravirt_op is missing when it is called.
  370. config MEMTEST
  371. bool "Memtest"
  372. help
  373. This option adds a kernel parameter 'memtest', which allows memtest
  374. to be set.
  375. memtest=0, mean disabled; -- default
  376. memtest=1, mean do 1 test pattern;
  377. ...
  378. memtest=4, mean do 4 test patterns.
  379. If you are unsure how to answer this question, answer N.
  380. config X86_SUMMIT_NUMA
  381. def_bool y
  382. depends on X86_32 && NUMA && X86_GENERICARCH
  383. config X86_CYCLONE_TIMER
  384. def_bool y
  385. depends on X86_GENERICARCH
  386. source "arch/x86/Kconfig.cpu"
  387. config HPET_TIMER
  388. def_bool X86_64
  389. prompt "HPET Timer Support" if X86_32
  390. help
  391. Use the IA-PC HPET (High Precision Event Timer) to manage
  392. time in preference to the PIT and RTC, if a HPET is
  393. present.
  394. HPET is the next generation timer replacing legacy 8254s.
  395. The HPET provides a stable time base on SMP
  396. systems, unlike the TSC, but it is more expensive to access,
  397. as it is off-chip. You can find the HPET spec at
  398. <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
  399. You can safely choose Y here. However, HPET will only be
  400. activated if the platform and the BIOS support this feature.
  401. Otherwise the 8254 will be used for timing services.
  402. Choose N to continue using the legacy 8254 timer.
  403. config HPET_EMULATE_RTC
  404. def_bool y
  405. depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
  406. # Mark as embedded because too many people got it wrong.
  407. # The code disables itself when not needed.
  408. config DMI
  409. default y
  410. bool "Enable DMI scanning" if EMBEDDED
  411. help
  412. Enabled scanning of DMI to identify machine quirks. Say Y
  413. here unless you have verified that your setup is not
  414. affected by entries in the DMI blacklist. Required by PNP
  415. BIOS code.
  416. config GART_IOMMU
  417. bool "GART IOMMU support" if EMBEDDED
  418. default y
  419. select SWIOTLB
  420. select AGP
  421. depends on X86_64 && PCI
  422. help
  423. Support for full DMA access of devices with 32bit memory access only
  424. on systems with more than 3GB. This is usually needed for USB,
  425. sound, many IDE/SATA chipsets and some other devices.
  426. Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
  427. based hardware IOMMU and a software bounce buffer based IOMMU used
  428. on Intel systems and as fallback.
  429. The code is only active when needed (enough memory and limited
  430. device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
  431. too.
  432. config CALGARY_IOMMU
  433. bool "IBM Calgary IOMMU support"
  434. select SWIOTLB
  435. depends on X86_64 && PCI && EXPERIMENTAL
  436. help
  437. Support for hardware IOMMUs in IBM's xSeries x366 and x460
  438. systems. Needed to run systems with more than 3GB of memory
  439. properly with 32-bit PCI devices that do not support DAC
  440. (Double Address Cycle). Calgary also supports bus level
  441. isolation, where all DMAs pass through the IOMMU. This
  442. prevents them from going anywhere except their intended
  443. destination. This catches hard-to-find kernel bugs and
  444. mis-behaving drivers and devices that do not use the DMA-API
  445. properly to set up their DMA buffers. The IOMMU can be
  446. turned off at boot time with the iommu=off parameter.
  447. Normally the kernel will make the right choice by itself.
  448. If unsure, say Y.
  449. config CALGARY_IOMMU_ENABLED_BY_DEFAULT
  450. def_bool y
  451. prompt "Should Calgary be enabled by default?"
  452. depends on CALGARY_IOMMU
  453. help
  454. Should Calgary be enabled by default? if you choose 'y', Calgary
  455. will be used (if it exists). If you choose 'n', Calgary will not be
  456. used even if it exists. If you choose 'n' and would like to use
  457. Calgary anyway, pass 'iommu=calgary' on the kernel command line.
  458. If unsure, say Y.
  459. config AMD_IOMMU
  460. bool "AMD IOMMU support"
  461. select SWIOTLB
  462. select PCI_MSI
  463. depends on X86_64 && PCI && ACPI
  464. help
  465. With this option you can enable support for AMD IOMMU hardware in
  466. your system. An IOMMU is a hardware component which provides
  467. remapping of DMA memory accesses from devices. With an AMD IOMMU you
  468. can isolate the the DMA memory of different devices and protect the
  469. system from misbehaving device drivers or hardware.
  470. You can find out if your system has an AMD IOMMU if you look into
  471. your BIOS for an option to enable it or if you have an IVRS ACPI
  472. table.
  473. config AMD_IOMMU_STATS
  474. bool "Export AMD IOMMU statistics to debugfs"
  475. depends on AMD_IOMMU
  476. select DEBUG_FS
  477. help
  478. This option enables code in the AMD IOMMU driver to collect various
  479. statistics about whats happening in the driver and exports that
  480. information to userspace via debugfs.
  481. If unsure, say N.
  482. # need this always selected by IOMMU for the VIA workaround
  483. config SWIOTLB
  484. def_bool y if X86_64
  485. help
  486. Support for software bounce buffers used on x86-64 systems
  487. which don't have a hardware IOMMU (e.g. the current generation
  488. of Intel's x86-64 CPUs). Using this PCI devices which can only
  489. access 32-bits of memory can be used on systems with more than
  490. 3 GB of memory. If unsure, say Y.
  491. config IOMMU_HELPER
  492. def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
  493. config IOMMU_API
  494. def_bool (AMD_IOMMU || DMAR)
  495. config MAXSMP
  496. bool "Configure Maximum number of SMP Processors and NUMA Nodes"
  497. depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
  498. select CPUMASK_OFFSTACK
  499. default n
  500. help
  501. Configure maximum number of CPUS and NUMA Nodes for this architecture.
  502. If unsure, say N.
  503. config NR_CPUS
  504. int "Maximum number of CPUs" if SMP && !MAXSMP
  505. range 2 512 if SMP && !MAXSMP
  506. default "1" if !SMP
  507. default "4096" if MAXSMP
  508. default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
  509. default "8" if SMP
  510. help
  511. This allows you to specify the maximum number of CPUs which this
  512. kernel will support. The maximum supported value is 512 and the
  513. minimum value which makes sense is 2.
  514. This is purely to save memory - each supported CPU adds
  515. approximately eight kilobytes to the kernel image.
  516. config SCHED_SMT
  517. bool "SMT (Hyperthreading) scheduler support"
  518. depends on X86_HT
  519. help
  520. SMT scheduler support improves the CPU scheduler's decision making
  521. when dealing with Intel Pentium 4 chips with HyperThreading at a
  522. cost of slightly increased overhead in some places. If unsure say
  523. N here.
  524. config SCHED_MC
  525. def_bool y
  526. prompt "Multi-core scheduler support"
  527. depends on X86_HT
  528. help
  529. Multi-core scheduler support improves the CPU scheduler's decision
  530. making when dealing with multi-core CPU chips at a cost of slightly
  531. increased overhead in some places. If unsure say N here.
  532. source "kernel/Kconfig.preempt"
  533. config X86_UP_APIC
  534. bool "Local APIC support on uniprocessors"
  535. depends on X86_32 && !SMP && !(X86_VOYAGER || X86_GENERICARCH)
  536. help
  537. A local APIC (Advanced Programmable Interrupt Controller) is an
  538. integrated interrupt controller in the CPU. If you have a single-CPU
  539. system which has a processor with a local APIC, you can say Y here to
  540. enable and use it. If you say Y here even though your machine doesn't
  541. have a local APIC, then the kernel will still run with no slowdown at
  542. all. The local APIC supports CPU-generated self-interrupts (timer,
  543. performance counters), and the NMI watchdog which detects hard
  544. lockups.
  545. config X86_UP_IOAPIC
  546. bool "IO-APIC support on uniprocessors"
  547. depends on X86_UP_APIC
  548. help
  549. An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
  550. SMP-capable replacement for PC-style interrupt controllers. Most
  551. SMP systems and many recent uniprocessor systems have one.
  552. If you have a single-CPU system with an IO-APIC, you can say Y here
  553. to use it. If you say Y here even though your machine doesn't have
  554. an IO-APIC, then the kernel will still run with no slowdown at all.
  555. config X86_LOCAL_APIC
  556. def_bool y
  557. depends on X86_64 || (X86_32 && (X86_UP_APIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
  558. config X86_IO_APIC
  559. def_bool y
  560. depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
  561. config X86_VISWS_APIC
  562. def_bool y
  563. depends on X86_32 && X86_VISWS
  564. config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
  565. bool "Reroute for broken boot IRQs"
  566. default n
  567. depends on X86_IO_APIC
  568. help
  569. This option enables a workaround that fixes a source of
  570. spurious interrupts. This is recommended when threaded
  571. interrupt handling is used on systems where the generation of
  572. superfluous "boot interrupts" cannot be disabled.
  573. Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
  574. entry in the chipset's IO-APIC is masked (as, e.g. the RT
  575. kernel does during interrupt handling). On chipsets where this
  576. boot IRQ generation cannot be disabled, this workaround keeps
  577. the original IRQ line masked so that only the equivalent "boot
  578. IRQ" is delivered to the CPUs. The workaround also tells the
  579. kernel to set up the IRQ handler on the boot IRQ line. In this
  580. way only one interrupt is delivered to the kernel. Otherwise
  581. the spurious second interrupt may cause the kernel to bring
  582. down (vital) interrupt lines.
  583. Only affects "broken" chipsets. Interrupt sharing may be
  584. increased on these systems.
  585. config X86_MCE
  586. bool "Machine Check Exception"
  587. depends on !X86_VOYAGER
  588. ---help---
  589. Machine Check Exception support allows the processor to notify the
  590. kernel if it detects a problem (e.g. overheating, component failure).
  591. The action the kernel takes depends on the severity of the problem,
  592. ranging from a warning message on the console, to halting the machine.
  593. Your processor must be a Pentium or newer to support this - check the
  594. flags in /proc/cpuinfo for mce. Note that some older Pentium systems
  595. have a design flaw which leads to false MCE events - hence MCE is
  596. disabled on all P5 processors, unless explicitly enabled with "mce"
  597. as a boot argument. Similarly, if MCE is built in and creates a
  598. problem on some new non-standard machine, you can boot with "nomce"
  599. to disable it. MCE support simply ignores non-MCE processors like
  600. the 386 and 486, so nearly everyone can say Y here.
  601. config X86_MCE_INTEL
  602. def_bool y
  603. prompt "Intel MCE features"
  604. depends on X86_64 && X86_MCE && X86_LOCAL_APIC
  605. help
  606. Additional support for intel specific MCE features such as
  607. the thermal monitor.
  608. config X86_MCE_AMD
  609. def_bool y
  610. prompt "AMD MCE features"
  611. depends on X86_64 && X86_MCE && X86_LOCAL_APIC
  612. help
  613. Additional support for AMD specific MCE features such as
  614. the DRAM Error Threshold.
  615. config X86_MCE_THRESHOLD
  616. depends on X86_MCE_AMD || X86_MCE_INTEL
  617. bool
  618. default y
  619. config X86_MCE_NONFATAL
  620. tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
  621. depends on X86_32 && X86_MCE
  622. help
  623. Enabling this feature starts a timer that triggers every 5 seconds which
  624. will look at the machine check registers to see if anything happened.
  625. Non-fatal problems automatically get corrected (but still logged).
  626. Disable this if you don't want to see these messages.
  627. Seeing the messages this option prints out may be indicative of dying
  628. or out-of-spec (ie, overclocked) hardware.
  629. This option only does something on certain CPUs.
  630. (AMD Athlon/Duron and Intel Pentium 4)
  631. config X86_MCE_P4THERMAL
  632. bool "check for P4 thermal throttling interrupt."
  633. depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP)
  634. help
  635. Enabling this feature will cause a message to be printed when the P4
  636. enters thermal throttling.
  637. config VM86
  638. bool "Enable VM86 support" if EMBEDDED
  639. default y
  640. depends on X86_32
  641. help
  642. This option is required by programs like DOSEMU to run 16-bit legacy
  643. code on X86 processors. It also may be needed by software like
  644. XFree86 to initialize some video cards via BIOS. Disabling this
  645. option saves about 6k.
  646. config TOSHIBA
  647. tristate "Toshiba Laptop support"
  648. depends on X86_32
  649. ---help---
  650. This adds a driver to safely access the System Management Mode of
  651. the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
  652. not work on models with a Phoenix BIOS. The System Management Mode
  653. is used to set the BIOS and power saving options on Toshiba portables.
  654. For information on utilities to make use of this driver see the
  655. Toshiba Linux utilities web site at:
  656. <http://www.buzzard.org.uk/toshiba/>.
  657. Say Y if you intend to run this kernel on a Toshiba portable.
  658. Say N otherwise.
  659. config I8K
  660. tristate "Dell laptop support"
  661. ---help---
  662. This adds a driver to safely access the System Management Mode
  663. of the CPU on the Dell Inspiron 8000. The System Management Mode
  664. is used to read cpu temperature and cooling fan status and to
  665. control the fans on the I8K portables.
  666. This driver has been tested only on the Inspiron 8000 but it may
  667. also work with other Dell laptops. You can force loading on other
  668. models by passing the parameter `force=1' to the module. Use at
  669. your own risk.
  670. For information on utilities to make use of this driver see the
  671. I8K Linux utilities web site at:
  672. <http://people.debian.org/~dz/i8k/>
  673. Say Y if you intend to run this kernel on a Dell Inspiron 8000.
  674. Say N otherwise.
  675. config X86_REBOOTFIXUPS
  676. bool "Enable X86 board specific fixups for reboot"
  677. depends on X86_32
  678. ---help---
  679. This enables chipset and/or board specific fixups to be done
  680. in order to get reboot to work correctly. This is only needed on
  681. some combinations of hardware and BIOS. The symptom, for which
  682. this config is intended, is when reboot ends with a stalled/hung
  683. system.
  684. Currently, the only fixup is for the Geode machines using
  685. CS5530A and CS5536 chipsets and the RDC R-321x SoC.
  686. Say Y if you want to enable the fixup. Currently, it's safe to
  687. enable this option even if you don't need it.
  688. Say N otherwise.
  689. config MICROCODE
  690. tristate "/dev/cpu/microcode - microcode support"
  691. select FW_LOADER
  692. ---help---
  693. If you say Y here, you will be able to update the microcode on
  694. certain Intel and AMD processors. The Intel support is for the
  695. IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
  696. Pentium 4, Xeon etc. The AMD support is for family 0x10 and
  697. 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
  698. You will obviously need the actual microcode binary data itself
  699. which is not shipped with the Linux kernel.
  700. This option selects the general module only, you need to select
  701. at least one vendor specific module as well.
  702. To compile this driver as a module, choose M here: the
  703. module will be called microcode.
  704. config MICROCODE_INTEL
  705. bool "Intel microcode patch loading support"
  706. depends on MICROCODE
  707. default MICROCODE
  708. select FW_LOADER
  709. --help---
  710. This options enables microcode patch loading support for Intel
  711. processors.
  712. For latest news and information on obtaining all the required
  713. Intel ingredients for this driver, check:
  714. <http://www.urbanmyth.org/microcode/>.
  715. config MICROCODE_AMD
  716. bool "AMD microcode patch loading support"
  717. depends on MICROCODE
  718. select FW_LOADER
  719. --help---
  720. If you select this option, microcode patch loading support for AMD
  721. processors will be enabled.
  722. config MICROCODE_OLD_INTERFACE
  723. def_bool y
  724. depends on MICROCODE
  725. config X86_MSR
  726. tristate "/dev/cpu/*/msr - Model-specific register support"
  727. help
  728. This device gives privileged processes access to the x86
  729. Model-Specific Registers (MSRs). It is a character device with
  730. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  731. MSR accesses are directed to a specific CPU on multi-processor
  732. systems.
  733. config X86_CPUID
  734. tristate "/dev/cpu/*/cpuid - CPU information support"
  735. help
  736. This device gives processes access to the x86 CPUID instruction to
  737. be executed on a specific processor. It is a character device
  738. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  739. /dev/cpu/31/cpuid.
  740. choice
  741. prompt "High Memory Support"
  742. default HIGHMEM4G if !X86_NUMAQ
  743. default HIGHMEM64G if X86_NUMAQ
  744. depends on X86_32
  745. config NOHIGHMEM
  746. bool "off"
  747. depends on !X86_NUMAQ
  748. ---help---
  749. Linux can use up to 64 Gigabytes of physical memory on x86 systems.
  750. However, the address space of 32-bit x86 processors is only 4
  751. Gigabytes large. That means that, if you have a large amount of
  752. physical memory, not all of it can be "permanently mapped" by the
  753. kernel. The physical memory that's not permanently mapped is called
  754. "high memory".
  755. If you are compiling a kernel which will never run on a machine with
  756. more than 1 Gigabyte total physical RAM, answer "off" here (default
  757. choice and suitable for most users). This will result in a "3GB/1GB"
  758. split: 3GB are mapped so that each process sees a 3GB virtual memory
  759. space and the remaining part of the 4GB virtual memory space is used
  760. by the kernel to permanently map as much physical memory as
  761. possible.
  762. If the machine has between 1 and 4 Gigabytes physical RAM, then
  763. answer "4GB" here.
  764. If more than 4 Gigabytes is used then answer "64GB" here. This
  765. selection turns Intel PAE (Physical Address Extension) mode on.
  766. PAE implements 3-level paging on IA32 processors. PAE is fully
  767. supported by Linux, PAE mode is implemented on all recent Intel
  768. processors (Pentium Pro and better). NOTE: If you say "64GB" here,
  769. then the kernel will not boot on CPUs that don't support PAE!
  770. The actual amount of total physical memory will either be
  771. auto detected or can be forced by using a kernel command line option
  772. such as "mem=256M". (Try "man bootparam" or see the documentation of
  773. your boot loader (lilo or loadlin) about how to pass options to the
  774. kernel at boot time.)
  775. If unsure, say "off".
  776. config HIGHMEM4G
  777. bool "4GB"
  778. depends on !X86_NUMAQ
  779. help
  780. Select this if you have a 32-bit processor and between 1 and 4
  781. gigabytes of physical RAM.
  782. config HIGHMEM64G
  783. bool "64GB"
  784. depends on !M386 && !M486
  785. select X86_PAE
  786. help
  787. Select this if you have a 32-bit processor and more than 4
  788. gigabytes of physical RAM.
  789. endchoice
  790. choice
  791. depends on EXPERIMENTAL
  792. prompt "Memory split" if EMBEDDED
  793. default VMSPLIT_3G
  794. depends on X86_32
  795. help
  796. Select the desired split between kernel and user memory.
  797. If the address range available to the kernel is less than the
  798. physical memory installed, the remaining memory will be available
  799. as "high memory". Accessing high memory is a little more costly
  800. than low memory, as it needs to be mapped into the kernel first.
  801. Note that increasing the kernel address space limits the range
  802. available to user programs, making the address space there
  803. tighter. Selecting anything other than the default 3G/1G split
  804. will also likely make your kernel incompatible with binary-only
  805. kernel modules.
  806. If you are not absolutely sure what you are doing, leave this
  807. option alone!
  808. config VMSPLIT_3G
  809. bool "3G/1G user/kernel split"
  810. config VMSPLIT_3G_OPT
  811. depends on !X86_PAE
  812. bool "3G/1G user/kernel split (for full 1G low memory)"
  813. config VMSPLIT_2G
  814. bool "2G/2G user/kernel split"
  815. config VMSPLIT_2G_OPT
  816. depends on !X86_PAE
  817. bool "2G/2G user/kernel split (for full 2G low memory)"
  818. config VMSPLIT_1G
  819. bool "1G/3G user/kernel split"
  820. endchoice
  821. config PAGE_OFFSET
  822. hex
  823. default 0xB0000000 if VMSPLIT_3G_OPT
  824. default 0x80000000 if VMSPLIT_2G
  825. default 0x78000000 if VMSPLIT_2G_OPT
  826. default 0x40000000 if VMSPLIT_1G
  827. default 0xC0000000
  828. depends on X86_32
  829. config HIGHMEM
  830. def_bool y
  831. depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
  832. config X86_PAE
  833. bool "PAE (Physical Address Extension) Support"
  834. depends on X86_32 && !HIGHMEM4G
  835. help
  836. PAE is required for NX support, and furthermore enables
  837. larger swapspace support for non-overcommit purposes. It
  838. has the cost of more pagetable lookup overhead, and also
  839. consumes more pagetable space per process.
  840. config ARCH_PHYS_ADDR_T_64BIT
  841. def_bool X86_64 || X86_PAE
  842. config DIRECT_GBPAGES
  843. bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
  844. default y
  845. depends on X86_64
  846. help
  847. Allow the kernel linear mapping to use 1GB pages on CPUs that
  848. support it. This can improve the kernel's performance a tiny bit by
  849. reducing TLB pressure. If in doubt, say "Y".
  850. # Common NUMA Features
  851. config NUMA
  852. bool "Numa Memory Allocation and Scheduler Support"
  853. depends on SMP
  854. depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
  855. default n if X86_PC
  856. default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
  857. help
  858. Enable NUMA (Non Uniform Memory Access) support.
  859. The kernel will try to allocate memory used by a CPU on the
  860. local memory controller of the CPU and add some more
  861. NUMA awareness to the kernel.
  862. For 64-bit this is recommended if the system is Intel Core i7
  863. (or later), AMD Opteron, or EM64T NUMA.
  864. For 32-bit this is only needed on (rare) 32-bit-only platforms
  865. that support NUMA topologies, such as NUMAQ / Summit, or if you
  866. boot a 32-bit kernel on a 64-bit NUMA platform.
  867. Otherwise, you should say N.
  868. comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
  869. depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
  870. config K8_NUMA
  871. def_bool y
  872. prompt "Old style AMD Opteron NUMA detection"
  873. depends on X86_64 && NUMA && PCI
  874. help
  875. Enable K8 NUMA node topology detection. You should say Y here if
  876. you have a multi processor AMD K8 system. This uses an old
  877. method to read the NUMA configuration directly from the builtin
  878. Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
  879. instead, which also takes priority if both are compiled in.
  880. config X86_64_ACPI_NUMA
  881. def_bool y
  882. prompt "ACPI NUMA detection"
  883. depends on X86_64 && NUMA && ACPI && PCI
  884. select ACPI_NUMA
  885. help
  886. Enable ACPI SRAT based node topology detection.
  887. # Some NUMA nodes have memory ranges that span
  888. # other nodes. Even though a pfn is valid and
  889. # between a node's start and end pfns, it may not
  890. # reside on that node. See memmap_init_zone()
  891. # for details.
  892. config NODES_SPAN_OTHER_NODES
  893. def_bool y
  894. depends on X86_64_ACPI_NUMA
  895. config NUMA_EMU
  896. bool "NUMA emulation"
  897. depends on X86_64 && NUMA
  898. help
  899. Enable NUMA emulation. A flat machine will be split
  900. into virtual nodes when booted with "numa=fake=N", where N is the
  901. number of nodes. This is only useful for debugging.
  902. config NODES_SHIFT
  903. int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
  904. range 1 9 if X86_64
  905. default "9" if MAXSMP
  906. default "6" if X86_64
  907. default "4" if X86_NUMAQ
  908. default "3"
  909. depends on NEED_MULTIPLE_NODES
  910. help
  911. Specify the maximum number of NUMA Nodes available on the target
  912. system. Increases memory reserved to accomodate various tables.
  913. config HAVE_ARCH_BOOTMEM_NODE
  914. def_bool y
  915. depends on X86_32 && NUMA
  916. config ARCH_HAVE_MEMORY_PRESENT
  917. def_bool y
  918. depends on X86_32 && DISCONTIGMEM
  919. config NEED_NODE_MEMMAP_SIZE
  920. def_bool y
  921. depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
  922. config HAVE_ARCH_ALLOC_REMAP
  923. def_bool y
  924. depends on X86_32 && NUMA
  925. config ARCH_FLATMEM_ENABLE
  926. def_bool y
  927. depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
  928. config ARCH_DISCONTIGMEM_ENABLE
  929. def_bool y
  930. depends on NUMA && X86_32
  931. config ARCH_DISCONTIGMEM_DEFAULT
  932. def_bool y
  933. depends on NUMA && X86_32
  934. config ARCH_SPARSEMEM_DEFAULT
  935. def_bool y
  936. depends on X86_64
  937. config ARCH_SPARSEMEM_ENABLE
  938. def_bool y
  939. depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC) || X86_GENERICARCH
  940. select SPARSEMEM_STATIC if X86_32
  941. select SPARSEMEM_VMEMMAP_ENABLE if X86_64
  942. config ARCH_SELECT_MEMORY_MODEL
  943. def_bool y
  944. depends on ARCH_SPARSEMEM_ENABLE
  945. config ARCH_MEMORY_PROBE
  946. def_bool X86_64
  947. depends on MEMORY_HOTPLUG
  948. source "mm/Kconfig"
  949. config HIGHPTE
  950. bool "Allocate 3rd-level pagetables from highmem"
  951. depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
  952. help
  953. The VM uses one page table entry for each page of physical memory.
  954. For systems with a lot of RAM, this can be wasteful of precious
  955. low memory. Setting this option will put user-space page table
  956. entries in high memory.
  957. config X86_CHECK_BIOS_CORRUPTION
  958. bool "Check for low memory corruption"
  959. help
  960. Periodically check for memory corruption in low memory, which
  961. is suspected to be caused by BIOS. Even when enabled in the
  962. configuration, it is disabled at runtime. Enable it by
  963. setting "memory_corruption_check=1" on the kernel command
  964. line. By default it scans the low 64k of memory every 60
  965. seconds; see the memory_corruption_check_size and
  966. memory_corruption_check_period parameters in
  967. Documentation/kernel-parameters.txt to adjust this.
  968. When enabled with the default parameters, this option has
  969. almost no overhead, as it reserves a relatively small amount
  970. of memory and scans it infrequently. It both detects corruption
  971. and prevents it from affecting the running system.
  972. It is, however, intended as a diagnostic tool; if repeatable
  973. BIOS-originated corruption always affects the same memory,
  974. you can use memmap= to prevent the kernel from using that
  975. memory.
  976. config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
  977. bool "Set the default setting of memory_corruption_check"
  978. depends on X86_CHECK_BIOS_CORRUPTION
  979. default y
  980. help
  981. Set whether the default state of memory_corruption_check is
  982. on or off.
  983. config X86_RESERVE_LOW_64K
  984. bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
  985. default y
  986. help
  987. Reserve the first 64K of physical RAM on BIOSes that are known
  988. to potentially corrupt that memory range. A numbers of BIOSes are
  989. known to utilize this area during suspend/resume, so it must not
  990. be used by the kernel.
  991. Set this to N if you are absolutely sure that you trust the BIOS
  992. to get all its memory reservations and usages right.
  993. If you have doubts about the BIOS (e.g. suspend/resume does not
  994. work or there's kernel crashes after certain hardware hotplug
  995. events) and it's not AMI or Phoenix, then you might want to enable
  996. X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
  997. corruption patterns.
  998. Say Y if unsure.
  999. config MATH_EMULATION
  1000. bool
  1001. prompt "Math emulation" if X86_32
  1002. ---help---
  1003. Linux can emulate a math coprocessor (used for floating point
  1004. operations) if you don't have one. 486DX and Pentium processors have
  1005. a math coprocessor built in, 486SX and 386 do not, unless you added
  1006. a 487DX or 387, respectively. (The messages during boot time can
  1007. give you some hints here ["man dmesg"].) Everyone needs either a
  1008. coprocessor or this emulation.
  1009. If you don't have a math coprocessor, you need to say Y here; if you
  1010. say Y here even though you have a coprocessor, the coprocessor will
  1011. be used nevertheless. (This behavior can be changed with the kernel
  1012. command line option "no387", which comes handy if your coprocessor
  1013. is broken. Try "man bootparam" or see the documentation of your boot
  1014. loader (lilo or loadlin) about how to pass options to the kernel at
  1015. boot time.) This means that it is a good idea to say Y here if you
  1016. intend to use this kernel on different machines.
  1017. More information about the internals of the Linux math coprocessor
  1018. emulation can be found in <file:arch/x86/math-emu/README>.
  1019. If you are not sure, say Y; apart from resulting in a 66 KB bigger
  1020. kernel, it won't hurt.
  1021. config MTRR
  1022. bool "MTRR (Memory Type Range Register) support"
  1023. ---help---
  1024. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  1025. the Memory Type Range Registers (MTRRs) may be used to control
  1026. processor access to memory ranges. This is most useful if you have
  1027. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  1028. allows bus write transfers to be combined into a larger transfer
  1029. before bursting over the PCI/AGP bus. This can increase performance
  1030. of image write operations 2.5 times or more. Saying Y here creates a
  1031. /proc/mtrr file which may be used to manipulate your processor's
  1032. MTRRs. Typically the X server should use this.
  1033. This code has a reasonably generic interface so that similar
  1034. control registers on other processors can be easily supported
  1035. as well:
  1036. The Cyrix 6x86, 6x86MX and M II processors have Address Range
  1037. Registers (ARRs) which provide a similar functionality to MTRRs. For
  1038. these, the ARRs are used to emulate the MTRRs.
  1039. The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
  1040. MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
  1041. write-combining. All of these processors are supported by this code
  1042. and it makes sense to say Y here if you have one of them.
  1043. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  1044. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  1045. can lead to all sorts of problems, so it's good to say Y here.
  1046. You can safely say Y even if your machine doesn't have MTRRs, you'll
  1047. just add about 9 KB to your kernel.
  1048. See <file:Documentation/x86/mtrr.txt> for more information.
  1049. config MTRR_SANITIZER
  1050. def_bool y
  1051. prompt "MTRR cleanup support"
  1052. depends on MTRR
  1053. help
  1054. Convert MTRR layout from continuous to discrete, so X drivers can
  1055. add writeback entries.
  1056. Can be disabled with disable_mtrr_cleanup on the kernel command line.
  1057. The largest mtrr entry size for a continous block can be set with
  1058. mtrr_chunk_size.
  1059. If unsure, say Y.
  1060. config MTRR_SANITIZER_ENABLE_DEFAULT
  1061. int "MTRR cleanup enable value (0-1)"
  1062. range 0 1
  1063. default "0"
  1064. depends on MTRR_SANITIZER
  1065. help
  1066. Enable mtrr cleanup default value
  1067. config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
  1068. int "MTRR cleanup spare reg num (0-7)"
  1069. range 0 7
  1070. default "1"
  1071. depends on MTRR_SANITIZER
  1072. help
  1073. mtrr cleanup spare entries default, it can be changed via
  1074. mtrr_spare_reg_nr=N on the kernel command line.
  1075. config X86_PAT
  1076. bool
  1077. prompt "x86 PAT support"
  1078. depends on MTRR
  1079. help
  1080. Use PAT attributes to setup page level cache control.
  1081. PATs are the modern equivalents of MTRRs and are much more
  1082. flexible than MTRRs.
  1083. Say N here if you see bootup problems (boot crash, boot hang,
  1084. spontaneous reboots) or a non-working video driver.
  1085. If unsure, say Y.
  1086. config EFI
  1087. bool "EFI runtime service support"
  1088. depends on ACPI
  1089. ---help---
  1090. This enables the kernel to use EFI runtime services that are
  1091. available (such as the EFI variable services).
  1092. This option is only useful on systems that have EFI firmware.
  1093. In addition, you should use the latest ELILO loader available
  1094. at <http://elilo.sourceforge.net> in order to take advantage
  1095. of EFI runtime services. However, even with this option, the
  1096. resultant kernel should continue to boot on existing non-EFI
  1097. platforms.
  1098. config SECCOMP
  1099. def_bool y
  1100. prompt "Enable seccomp to safely compute untrusted bytecode"
  1101. help
  1102. This kernel feature is useful for number crunching applications
  1103. that may need to compute untrusted bytecode during their
  1104. execution. By using pipes or other transports made available to
  1105. the process as file descriptors supporting the read/write
  1106. syscalls, it's possible to isolate those applications in
  1107. their own address space using seccomp. Once seccomp is
  1108. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1109. and the task is only allowed to execute a few safe syscalls
  1110. defined by each seccomp mode.
  1111. If unsure, say Y. Only embedded should say N here.
  1112. config CC_STACKPROTECTOR
  1113. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1114. depends on X86_64 && EXPERIMENTAL && BROKEN
  1115. help
  1116. This option turns on the -fstack-protector GCC feature. This
  1117. feature puts, at the beginning of critical functions, a canary
  1118. value on the stack just before the return address, and validates
  1119. the value just before actually returning. Stack based buffer
  1120. overflows (that need to overwrite this return address) now also
  1121. overwrite the canary, which gets detected and the attack is then
  1122. neutralized via a kernel panic.
  1123. This feature requires gcc version 4.2 or above, or a distribution
  1124. gcc with the feature backported. Older versions are automatically
  1125. detected and for those versions, this configuration option is ignored.
  1126. config CC_STACKPROTECTOR_ALL
  1127. bool "Use stack-protector for all functions"
  1128. depends on CC_STACKPROTECTOR
  1129. help
  1130. Normally, GCC only inserts the canary value protection for
  1131. functions that use large-ish on-stack buffers. By enabling
  1132. this option, GCC will be asked to do this for ALL functions.
  1133. source kernel/Kconfig.hz
  1134. config KEXEC
  1135. bool "kexec system call"
  1136. depends on X86_BIOS_REBOOT
  1137. help
  1138. kexec is a system call that implements the ability to shutdown your
  1139. current kernel, and to start another kernel. It is like a reboot
  1140. but it is independent of the system firmware. And like a reboot
  1141. you can start any kernel with it, not just Linux.
  1142. The name comes from the similarity to the exec system call.
  1143. It is an ongoing process to be certain the hardware in a machine
  1144. is properly shutdown, so do not be surprised if this code does not
  1145. initially work for you. It may help to enable device hotplugging
  1146. support. As of this writing the exact hardware interface is
  1147. strongly in flux, so no good recommendation can be made.
  1148. config CRASH_DUMP
  1149. bool "kernel crash dumps"
  1150. depends on X86_64 || (X86_32 && HIGHMEM)
  1151. help
  1152. Generate crash dump after being started by kexec.
  1153. This should be normally only set in special crash dump kernels
  1154. which are loaded in the main kernel with kexec-tools into
  1155. a specially reserved region and then later executed after
  1156. a crash by kdump/kexec. The crash dump kernel must be compiled
  1157. to a memory address not used by the main kernel or BIOS using
  1158. PHYSICAL_START, or it must be built as a relocatable image
  1159. (CONFIG_RELOCATABLE=y).
  1160. For more details see Documentation/kdump/kdump.txt
  1161. config KEXEC_JUMP
  1162. bool "kexec jump (EXPERIMENTAL)"
  1163. depends on EXPERIMENTAL
  1164. depends on KEXEC && HIBERNATION && X86_32
  1165. help
  1166. Jump between original kernel and kexeced kernel and invoke
  1167. code in physical address mode via KEXEC
  1168. config PHYSICAL_START
  1169. hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
  1170. default "0x1000000" if X86_NUMAQ
  1171. default "0x200000" if X86_64
  1172. default "0x100000"
  1173. help
  1174. This gives the physical address where the kernel is loaded.
  1175. If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
  1176. bzImage will decompress itself to above physical address and
  1177. run from there. Otherwise, bzImage will run from the address where
  1178. it has been loaded by the boot loader and will ignore above physical
  1179. address.
  1180. In normal kdump cases one does not have to set/change this option
  1181. as now bzImage can be compiled as a completely relocatable image
  1182. (CONFIG_RELOCATABLE=y) and be used to load and run from a different
  1183. address. This option is mainly useful for the folks who don't want
  1184. to use a bzImage for capturing the crash dump and want to use a
  1185. vmlinux instead. vmlinux is not relocatable hence a kernel needs
  1186. to be specifically compiled to run from a specific memory area
  1187. (normally a reserved region) and this option comes handy.
  1188. So if you are using bzImage for capturing the crash dump, leave
  1189. the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
  1190. Otherwise if you plan to use vmlinux for capturing the crash dump
  1191. change this value to start of the reserved region (Typically 16MB
  1192. 0x1000000). In other words, it can be set based on the "X" value as
  1193. specified in the "crashkernel=YM@XM" command line boot parameter
  1194. passed to the panic-ed kernel. Typically this parameter is set as
  1195. crashkernel=64M@16M. Please take a look at
  1196. Documentation/kdump/kdump.txt for more details about crash dumps.
  1197. Usage of bzImage for capturing the crash dump is recommended as
  1198. one does not have to build two kernels. Same kernel can be used
  1199. as production kernel and capture kernel. Above option should have
  1200. gone away after relocatable bzImage support is introduced. But it
  1201. is present because there are users out there who continue to use
  1202. vmlinux for dump capture. This option should go away down the
  1203. line.
  1204. Don't change this unless you know what you are doing.
  1205. config RELOCATABLE
  1206. bool "Build a relocatable kernel (EXPERIMENTAL)"
  1207. depends on EXPERIMENTAL
  1208. help
  1209. This builds a kernel image that retains relocation information
  1210. so it can be loaded someplace besides the default 1MB.
  1211. The relocations tend to make the kernel binary about 10% larger,
  1212. but are discarded at runtime.
  1213. One use is for the kexec on panic case where the recovery kernel
  1214. must live at a different physical address than the primary
  1215. kernel.
  1216. Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
  1217. it has been loaded at and the compile time physical address
  1218. (CONFIG_PHYSICAL_START) is ignored.
  1219. config PHYSICAL_ALIGN
  1220. hex
  1221. prompt "Alignment value to which kernel should be aligned" if X86_32
  1222. default "0x100000" if X86_32
  1223. default "0x200000" if X86_64
  1224. range 0x2000 0x400000
  1225. help
  1226. This value puts the alignment restrictions on physical address
  1227. where kernel is loaded and run from. Kernel is compiled for an
  1228. address which meets above alignment restriction.
  1229. If bootloader loads the kernel at a non-aligned address and
  1230. CONFIG_RELOCATABLE is set, kernel will move itself to nearest
  1231. address aligned to above value and run from there.
  1232. If bootloader loads the kernel at a non-aligned address and
  1233. CONFIG_RELOCATABLE is not set, kernel will ignore the run time
  1234. load address and decompress itself to the address it has been
  1235. compiled for and run from there. The address for which kernel is
  1236. compiled already meets above alignment restrictions. Hence the
  1237. end result is that kernel runs from a physical address meeting
  1238. above alignment restrictions.
  1239. Don't change this unless you know what you are doing.
  1240. config HOTPLUG_CPU
  1241. bool "Support for hot-pluggable CPUs"
  1242. depends on SMP && HOTPLUG && !X86_VOYAGER
  1243. ---help---
  1244. Say Y here to allow turning CPUs off and on. CPUs can be
  1245. controlled through /sys/devices/system/cpu.
  1246. ( Note: power management support will enable this option
  1247. automatically on SMP systems. )
  1248. Say N if you want to disable CPU hotplug.
  1249. config COMPAT_VDSO
  1250. def_bool y
  1251. prompt "Compat VDSO support"
  1252. depends on X86_32 || IA32_EMULATION
  1253. help
  1254. Map the 32-bit VDSO to the predictable old-style address too.
  1255. ---help---
  1256. Say N here if you are running a sufficiently recent glibc
  1257. version (2.3.3 or later), to remove the high-mapped
  1258. VDSO mapping and to exclusively use the randomized VDSO.
  1259. If unsure, say Y.
  1260. config CMDLINE_BOOL
  1261. bool "Built-in kernel command line"
  1262. default n
  1263. help
  1264. Allow for specifying boot arguments to the kernel at
  1265. build time. On some systems (e.g. embedded ones), it is
  1266. necessary or convenient to provide some or all of the
  1267. kernel boot arguments with the kernel itself (that is,
  1268. to not rely on the boot loader to provide them.)
  1269. To compile command line arguments into the kernel,
  1270. set this option to 'Y', then fill in the
  1271. the boot arguments in CONFIG_CMDLINE.
  1272. Systems with fully functional boot loaders (i.e. non-embedded)
  1273. should leave this option set to 'N'.
  1274. config CMDLINE
  1275. string "Built-in kernel command string"
  1276. depends on CMDLINE_BOOL
  1277. default ""
  1278. help
  1279. Enter arguments here that should be compiled into the kernel
  1280. image and used at boot time. If the boot loader provides a
  1281. command line at boot time, it is appended to this string to
  1282. form the full kernel command line, when the system boots.
  1283. However, you can use the CONFIG_CMDLINE_OVERRIDE option to
  1284. change this behavior.
  1285. In most cases, the command line (whether built-in or provided
  1286. by the boot loader) should specify the device for the root
  1287. file system.
  1288. config CMDLINE_OVERRIDE
  1289. bool "Built-in command line overrides boot loader arguments"
  1290. default n
  1291. depends on CMDLINE_BOOL
  1292. help
  1293. Set this option to 'Y' to have the kernel ignore the boot loader
  1294. command line, and use ONLY the built-in command line.
  1295. This is used to work around broken boot loaders. This should
  1296. be set to 'N' under normal conditions.
  1297. endmenu
  1298. config ARCH_ENABLE_MEMORY_HOTPLUG
  1299. def_bool y
  1300. depends on X86_64 || (X86_32 && HIGHMEM)
  1301. config ARCH_ENABLE_MEMORY_HOTREMOVE
  1302. def_bool y
  1303. depends on MEMORY_HOTPLUG
  1304. config HAVE_ARCH_EARLY_PFN_TO_NID
  1305. def_bool X86_64
  1306. depends on NUMA
  1307. menu "Power management and ACPI options"
  1308. depends on !X86_VOYAGER
  1309. config ARCH_HIBERNATION_HEADER
  1310. def_bool y
  1311. depends on X86_64 && HIBERNATION
  1312. source "kernel/power/Kconfig"
  1313. source "drivers/acpi/Kconfig"
  1314. config X86_APM_BOOT
  1315. bool
  1316. default y
  1317. depends on APM || APM_MODULE
  1318. menuconfig APM
  1319. tristate "APM (Advanced Power Management) BIOS support"
  1320. depends on X86_32 && PM_SLEEP
  1321. ---help---
  1322. APM is a BIOS specification for saving power using several different
  1323. techniques. This is mostly useful for battery powered laptops with
  1324. APM compliant BIOSes. If you say Y here, the system time will be
  1325. reset after a RESUME operation, the /proc/apm device will provide
  1326. battery status information, and user-space programs will receive
  1327. notification of APM "events" (e.g. battery status change).
  1328. If you select "Y" here, you can disable actual use of the APM
  1329. BIOS by passing the "apm=off" option to the kernel at boot time.
  1330. Note that the APM support is almost completely disabled for
  1331. machines with more than one CPU.
  1332. In order to use APM, you will need supporting software. For location
  1333. and more information, read <file:Documentation/power/pm.txt> and the
  1334. Battery Powered Linux mini-HOWTO, available from
  1335. <http://www.tldp.org/docs.html#howto>.
  1336. This driver does not spin down disk drives (see the hdparm(8)
  1337. manpage ("man 8 hdparm") for that), and it doesn't turn off
  1338. VESA-compliant "green" monitors.
  1339. This driver does not support the TI 4000M TravelMate and the ACER
  1340. 486/DX4/75 because they don't have compliant BIOSes. Many "green"
  1341. desktop machines also don't have compliant BIOSes, and this driver
  1342. may cause those machines to panic during the boot phase.
  1343. Generally, if you don't have a battery in your machine, there isn't
  1344. much point in using this driver and you should say N. If you get
  1345. random kernel OOPSes or reboots that don't seem to be related to
  1346. anything, try disabling/enabling this option (or disabling/enabling
  1347. APM in your BIOS).
  1348. Some other things you should try when experiencing seemingly random,
  1349. "weird" problems:
  1350. 1) make sure that you have enough swap space and that it is
  1351. enabled.
  1352. 2) pass the "no-hlt" option to the kernel
  1353. 3) switch on floating point emulation in the kernel and pass
  1354. the "no387" option to the kernel
  1355. 4) pass the "floppy=nodma" option to the kernel
  1356. 5) pass the "mem=4M" option to the kernel (thereby disabling
  1357. all but the first 4 MB of RAM)
  1358. 6) make sure that the CPU is not over clocked.
  1359. 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
  1360. 8) disable the cache from your BIOS settings
  1361. 9) install a fan for the video card or exchange video RAM
  1362. 10) install a better fan for the CPU
  1363. 11) exchange RAM chips
  1364. 12) exchange the motherboard.
  1365. To compile this driver as a module, choose M here: the
  1366. module will be called apm.
  1367. if APM
  1368. config APM_IGNORE_USER_SUSPEND
  1369. bool "Ignore USER SUSPEND"
  1370. help
  1371. This option will ignore USER SUSPEND requests. On machines with a
  1372. compliant APM BIOS, you want to say N. However, on the NEC Versa M
  1373. series notebooks, it is necessary to say Y because of a BIOS bug.
  1374. config APM_DO_ENABLE
  1375. bool "Enable PM at boot time"
  1376. ---help---
  1377. Enable APM features at boot time. From page 36 of the APM BIOS
  1378. specification: "When disabled, the APM BIOS does not automatically
  1379. power manage devices, enter the Standby State, enter the Suspend
  1380. State, or take power saving steps in response to CPU Idle calls."
  1381. This driver will make CPU Idle calls when Linux is idle (unless this
  1382. feature is turned off -- see "Do CPU IDLE calls", below). This
  1383. should always save battery power, but more complicated APM features
  1384. will be dependent on your BIOS implementation. You may need to turn
  1385. this option off if your computer hangs at boot time when using APM
  1386. support, or if it beeps continuously instead of suspending. Turn
  1387. this off if you have a NEC UltraLite Versa 33/C or a Toshiba
  1388. T400CDT. This is off by default since most machines do fine without
  1389. this feature.
  1390. config APM_CPU_IDLE
  1391. bool "Make CPU Idle calls when idle"
  1392. help
  1393. Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
  1394. On some machines, this can activate improved power savings, such as
  1395. a slowed CPU clock rate, when the machine is idle. These idle calls
  1396. are made after the idle loop has run for some length of time (e.g.,
  1397. 333 mS). On some machines, this will cause a hang at boot time or
  1398. whenever the CPU becomes idle. (On machines with more than one CPU,
  1399. this option does nothing.)
  1400. config APM_DISPLAY_BLANK
  1401. bool "Enable console blanking using APM"
  1402. help
  1403. Enable console blanking using the APM. Some laptops can use this to
  1404. turn off the LCD backlight when the screen blanker of the Linux
  1405. virtual console blanks the screen. Note that this is only used by
  1406. the virtual console screen blanker, and won't turn off the backlight
  1407. when using the X Window system. This also doesn't have anything to
  1408. do with your VESA-compliant power-saving monitor. Further, this
  1409. option doesn't work for all laptops -- it might not turn off your
  1410. backlight at all, or it might print a lot of errors to the console,
  1411. especially if you are using gpm.
  1412. config APM_ALLOW_INTS
  1413. bool "Allow interrupts during APM BIOS calls"
  1414. help
  1415. Normally we disable external interrupts while we are making calls to
  1416. the APM BIOS as a measure to lessen the effects of a badly behaving
  1417. BIOS implementation. The BIOS should reenable interrupts if it
  1418. needs to. Unfortunately, some BIOSes do not -- especially those in
  1419. many of the newer IBM Thinkpads. If you experience hangs when you
  1420. suspend, try setting this to Y. Otherwise, say N.
  1421. endif # APM
  1422. source "arch/x86/kernel/cpu/cpufreq/Kconfig"
  1423. source "drivers/cpuidle/Kconfig"
  1424. source "drivers/idle/Kconfig"
  1425. endmenu
  1426. menu "Bus options (PCI etc.)"
  1427. config PCI
  1428. bool "PCI support"
  1429. default y
  1430. select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
  1431. help
  1432. Find out whether you have a PCI motherboard. PCI is the name of a
  1433. bus system, i.e. the way the CPU talks to the other stuff inside
  1434. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1435. VESA. If you have PCI, say Y, otherwise N.
  1436. choice
  1437. prompt "PCI access mode"
  1438. depends on X86_32 && PCI
  1439. default PCI_GOANY
  1440. ---help---
  1441. On PCI systems, the BIOS can be used to detect the PCI devices and
  1442. determine their configuration. However, some old PCI motherboards
  1443. have BIOS bugs and may crash if this is done. Also, some embedded
  1444. PCI-based systems don't have any BIOS at all. Linux can also try to
  1445. detect the PCI hardware directly without using the BIOS.
  1446. With this option, you can specify how Linux should detect the
  1447. PCI devices. If you choose "BIOS", the BIOS will be used,
  1448. if you choose "Direct", the BIOS won't be used, and if you
  1449. choose "MMConfig", then PCI Express MMCONFIG will be used.
  1450. If you choose "Any", the kernel will try MMCONFIG, then the
  1451. direct access method and falls back to the BIOS if that doesn't
  1452. work. If unsure, go with the default, which is "Any".
  1453. config PCI_GOBIOS
  1454. bool "BIOS"
  1455. config PCI_GOMMCONFIG
  1456. bool "MMConfig"
  1457. config PCI_GODIRECT
  1458. bool "Direct"
  1459. config PCI_GOOLPC
  1460. bool "OLPC"
  1461. depends on OLPC
  1462. config PCI_GOANY
  1463. bool "Any"
  1464. endchoice
  1465. config PCI_BIOS
  1466. def_bool y
  1467. depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
  1468. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  1469. config PCI_DIRECT
  1470. def_bool y
  1471. depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
  1472. config PCI_MMCONFIG
  1473. def_bool y
  1474. depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
  1475. config PCI_OLPC
  1476. def_bool y
  1477. depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
  1478. config PCI_DOMAINS
  1479. def_bool y
  1480. depends on PCI
  1481. config PCI_MMCONFIG
  1482. bool "Support mmconfig PCI config space access"
  1483. depends on X86_64 && PCI && ACPI
  1484. config DMAR
  1485. bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
  1486. depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
  1487. help
  1488. DMA remapping (DMAR) devices support enables independent address
  1489. translations for Direct Memory Access (DMA) from devices.
  1490. These DMA remapping devices are reported via ACPI tables
  1491. and include PCI device scope covered by these DMA
  1492. remapping devices.
  1493. config DMAR_DEFAULT_ON
  1494. def_bool n
  1495. prompt "Enable DMA Remapping Devices by default"
  1496. depends on DMAR
  1497. help
  1498. Selecting this option will enable a DMAR device at boot time if
  1499. one is found. If this option is not selected, DMAR support can
  1500. be enabled by passing intel_iommu=on to the kernel. It is
  1501. recommended you say N here while the DMAR code remains
  1502. experimental.
  1503. config DMAR_GFX_WA
  1504. def_bool y
  1505. prompt "Support for Graphics workaround"
  1506. depends on DMAR
  1507. help
  1508. Current Graphics drivers tend to use physical address
  1509. for DMA and avoid using DMA APIs. Setting this config
  1510. option permits the IOMMU driver to set a unity map for
  1511. all the OS-visible memory. Hence the driver can continue
  1512. to use physical addresses for DMA.
  1513. config DMAR_FLOPPY_WA
  1514. def_bool y
  1515. depends on DMAR
  1516. help
  1517. Floppy disk drivers are know to bypass DMA API calls
  1518. thereby failing to work when IOMMU is enabled. This
  1519. workaround will setup a 1:1 mapping for the first
  1520. 16M to make floppy (an ISA device) work.
  1521. config INTR_REMAP
  1522. bool "Support for Interrupt Remapping (EXPERIMENTAL)"
  1523. depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
  1524. help
  1525. Supports Interrupt remapping for IO-APIC and MSI devices.
  1526. To use x2apic mode in the CPU's which support x2APIC enhancements or
  1527. to support platforms with CPU's having > 8 bit APIC ID, say Y.
  1528. source "drivers/pci/pcie/Kconfig"
  1529. source "drivers/pci/Kconfig"
  1530. # x86_64 have no ISA slots, but do have ISA-style DMA.
  1531. config ISA_DMA_API
  1532. def_bool y
  1533. if X86_32
  1534. config ISA
  1535. bool "ISA support"
  1536. depends on !X86_VOYAGER
  1537. help
  1538. Find out whether you have ISA slots on your motherboard. ISA is the
  1539. name of a bus system, i.e. the way the CPU talks to the other stuff
  1540. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1541. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1542. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1543. config EISA
  1544. bool "EISA support"
  1545. depends on ISA
  1546. ---help---
  1547. The Extended Industry Standard Architecture (EISA) bus was
  1548. developed as an open alternative to the IBM MicroChannel bus.
  1549. The EISA bus provided some of the features of the IBM MicroChannel
  1550. bus while maintaining backward compatibility with cards made for
  1551. the older ISA bus. The EISA bus saw limited use between 1988 and
  1552. 1995 when it was made obsolete by the PCI bus.
  1553. Say Y here if you are building a kernel for an EISA-based machine.
  1554. Otherwise, say N.
  1555. source "drivers/eisa/Kconfig"
  1556. config MCA
  1557. bool "MCA support" if !X86_VOYAGER
  1558. default y if X86_VOYAGER
  1559. help
  1560. MicroChannel Architecture is found in some IBM PS/2 machines and
  1561. laptops. It is a bus system similar to PCI or ISA. See
  1562. <file:Documentation/mca.txt> (and especially the web page given
  1563. there) before attempting to build an MCA bus kernel.
  1564. source "drivers/mca/Kconfig"
  1565. config SCx200
  1566. tristate "NatSemi SCx200 support"
  1567. depends on !X86_VOYAGER
  1568. help
  1569. This provides basic support for National Semiconductor's
  1570. (now AMD's) Geode processors. The driver probes for the
  1571. PCI-IDs of several on-chip devices, so its a good dependency
  1572. for other scx200_* drivers.
  1573. If compiled as a module, the driver is named scx200.
  1574. config SCx200HR_TIMER
  1575. tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
  1576. depends on SCx200 && GENERIC_TIME
  1577. default y
  1578. help
  1579. This driver provides a clocksource built upon the on-chip
  1580. 27MHz high-resolution timer. Its also a workaround for
  1581. NSC Geode SC-1100's buggy TSC, which loses time when the
  1582. processor goes idle (as is done by the scheduler). The
  1583. other workaround is idle=poll boot option.
  1584. config GEODE_MFGPT_TIMER
  1585. def_bool y
  1586. prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
  1587. depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
  1588. help
  1589. This driver provides a clock event source based on the MFGPT
  1590. timer(s) in the CS5535 and CS5536 companion chip for the geode.
  1591. MFGPTs have a better resolution and max interval than the
  1592. generic PIT, and are suitable for use as high-res timers.
  1593. config OLPC
  1594. bool "One Laptop Per Child support"
  1595. default n
  1596. help
  1597. Add support for detecting the unique features of the OLPC
  1598. XO hardware.
  1599. endif # X86_32
  1600. config K8_NB
  1601. def_bool y
  1602. depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
  1603. source "drivers/pcmcia/Kconfig"
  1604. source "drivers/pci/hotplug/Kconfig"
  1605. endmenu
  1606. menu "Executable file formats / Emulations"
  1607. source "fs/Kconfig.binfmt"
  1608. config IA32_EMULATION
  1609. bool "IA32 Emulation"
  1610. depends on X86_64
  1611. select COMPAT_BINFMT_ELF
  1612. help
  1613. Include code to run 32-bit programs under a 64-bit kernel. You should
  1614. likely turn this on, unless you're 100% sure that you don't have any
  1615. 32-bit programs left.
  1616. config IA32_AOUT
  1617. tristate "IA32 a.out support"
  1618. depends on IA32_EMULATION
  1619. help
  1620. Support old a.out binaries in the 32bit emulation.
  1621. config COMPAT
  1622. def_bool y
  1623. depends on IA32_EMULATION
  1624. config COMPAT_FOR_U64_ALIGNMENT
  1625. def_bool COMPAT
  1626. depends on X86_64
  1627. config SYSVIPC_COMPAT
  1628. def_bool y
  1629. depends on COMPAT && SYSVIPC
  1630. endmenu
  1631. config HAVE_ATOMIC_IOMAP
  1632. def_bool y
  1633. depends on X86_32
  1634. source "net/Kconfig"
  1635. source "drivers/Kconfig"
  1636. source "drivers/firmware/Kconfig"
  1637. source "fs/Kconfig"
  1638. source "arch/x86/Kconfig.debug"
  1639. source "security/Kconfig"
  1640. source "crypto/Kconfig"
  1641. source "arch/x86/kvm/Kconfig"
  1642. source "lib/Kconfig"