Kconfig 18 KB

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  1. #
  2. # For a description of the syntax of this configuration file,
  3. # see Documentation/kbuild/kconfig-language.txt.
  4. #
  5. # Note: ISA is disabled and will hopefully never be enabled.
  6. # If you managed to buy an ISA x86-64 box you'll have to fix all the
  7. # ISA drivers you need yourself.
  8. #
  9. mainmenu "Linux Kernel Configuration"
  10. config X86_64
  11. bool
  12. default y
  13. help
  14. Port to the x86-64 architecture. x86-64 is a 64-bit extension to the
  15. classical 32-bit x86 architecture. For details see
  16. <http://www.x86-64.org/>.
  17. config 64BIT
  18. def_bool y
  19. config X86
  20. bool
  21. default y
  22. config ZONE_DMA32
  23. bool
  24. default y
  25. config LOCKDEP_SUPPORT
  26. bool
  27. default y
  28. config STACKTRACE_SUPPORT
  29. bool
  30. default y
  31. config SEMAPHORE_SLEEPERS
  32. bool
  33. default y
  34. config MMU
  35. bool
  36. default y
  37. config ISA
  38. bool
  39. config SBUS
  40. bool
  41. config RWSEM_GENERIC_SPINLOCK
  42. bool
  43. default y
  44. config RWSEM_XCHGADD_ALGORITHM
  45. bool
  46. config GENERIC_HWEIGHT
  47. bool
  48. default y
  49. config GENERIC_CALIBRATE_DELAY
  50. bool
  51. default y
  52. config X86_CMPXCHG
  53. bool
  54. default y
  55. config EARLY_PRINTK
  56. bool
  57. default y
  58. config GENERIC_ISA_DMA
  59. bool
  60. default y
  61. config GENERIC_IOMAP
  62. bool
  63. default y
  64. config ARCH_MAY_HAVE_PC_FDC
  65. bool
  66. default y
  67. config ARCH_POPULATES_NODE_MAP
  68. def_bool y
  69. config DMI
  70. bool
  71. default y
  72. config AUDIT_ARCH
  73. bool
  74. default y
  75. source "init/Kconfig"
  76. menu "Processor type and features"
  77. choice
  78. prompt "Subarchitecture Type"
  79. default X86_PC
  80. config X86_PC
  81. bool "PC-compatible"
  82. help
  83. Choose this option if your computer is a standard PC or compatible.
  84. config X86_VSMP
  85. bool "Support for ScaleMP vSMP"
  86. depends on PCI
  87. help
  88. Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
  89. supposed to run on these EM64T-based machines. Only choose this option
  90. if you have one of these machines.
  91. endchoice
  92. choice
  93. prompt "Processor family"
  94. default MK8
  95. config MK8
  96. bool "AMD-Opteron/Athlon64"
  97. help
  98. Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
  99. config MPSC
  100. bool "Intel EM64T"
  101. help
  102. Optimize for Intel Pentium 4 and Xeon CPUs with Intel
  103. Extended Memory 64 Technology(EM64T). For details see
  104. <http://www.intel.com/technology/64bitextensions/>.
  105. config GENERIC_CPU
  106. bool "Generic-x86-64"
  107. help
  108. Generic x86-64 CPU.
  109. endchoice
  110. #
  111. # Define implied options from the CPU selection here
  112. #
  113. config X86_L1_CACHE_BYTES
  114. int
  115. default "128" if GENERIC_CPU || MPSC
  116. default "64" if MK8
  117. config X86_L1_CACHE_SHIFT
  118. int
  119. default "7" if GENERIC_CPU || MPSC
  120. default "6" if MK8
  121. config X86_INTERNODE_CACHE_BYTES
  122. int
  123. default "4096" if X86_VSMP
  124. default X86_L1_CACHE_BYTES if !X86_VSMP
  125. config X86_TSC
  126. bool
  127. default y
  128. config X86_GOOD_APIC
  129. bool
  130. default y
  131. config MICROCODE
  132. tristate "/dev/cpu/microcode - Intel CPU microcode support"
  133. select FW_LOADER
  134. ---help---
  135. If you say Y here the 'File systems' section, you will be
  136. able to update the microcode on Intel processors. You will
  137. obviously need the actual microcode binary data itself which is
  138. not shipped with the Linux kernel.
  139. For latest news and information on obtaining all the required
  140. ingredients for this driver, check:
  141. <http://www.urbanmyth.org/microcode/>.
  142. To compile this driver as a module, choose M here: the
  143. module will be called microcode.
  144. If you use modprobe or kmod you may also want to add the line
  145. 'alias char-major-10-184 microcode' to your /etc/modules.conf file.
  146. config MICROCODE_OLD_INTERFACE
  147. bool
  148. depends on MICROCODE
  149. default y
  150. config X86_MSR
  151. tristate "/dev/cpu/*/msr - Model-specific register support"
  152. help
  153. This device gives privileged processes access to the x86
  154. Model-Specific Registers (MSRs). It is a character device with
  155. major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
  156. MSR accesses are directed to a specific CPU on multi-processor
  157. systems.
  158. config X86_CPUID
  159. tristate "/dev/cpu/*/cpuid - CPU information support"
  160. help
  161. This device gives processes access to the x86 CPUID instruction to
  162. be executed on a specific processor. It is a character device
  163. with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
  164. /dev/cpu/31/cpuid.
  165. config X86_HT
  166. bool
  167. depends on SMP && !MK8
  168. default y
  169. config MATH_EMULATION
  170. bool
  171. config MCA
  172. bool
  173. config EISA
  174. bool
  175. config X86_IO_APIC
  176. bool
  177. default y
  178. config X86_LOCAL_APIC
  179. bool
  180. default y
  181. config MTRR
  182. bool "MTRR (Memory Type Range Register) support"
  183. ---help---
  184. On Intel P6 family processors (Pentium Pro, Pentium II and later)
  185. the Memory Type Range Registers (MTRRs) may be used to control
  186. processor access to memory ranges. This is most useful if you have
  187. a video (VGA) card on a PCI or AGP bus. Enabling write-combining
  188. allows bus write transfers to be combined into a larger transfer
  189. before bursting over the PCI/AGP bus. This can increase performance
  190. of image write operations 2.5 times or more. Saying Y here creates a
  191. /proc/mtrr file which may be used to manipulate your processor's
  192. MTRRs. Typically the X server should use this.
  193. This code has a reasonably generic interface so that similar
  194. control registers on other processors can be easily supported
  195. as well.
  196. Saying Y here also fixes a problem with buggy SMP BIOSes which only
  197. set the MTRRs for the boot CPU and not for the secondary CPUs. This
  198. can lead to all sorts of problems, so it's good to say Y here.
  199. Just say Y here, all x86-64 machines support MTRRs.
  200. See <file:Documentation/mtrr.txt> for more information.
  201. config SMP
  202. bool "Symmetric multi-processing support"
  203. ---help---
  204. This enables support for systems with more than one CPU. If you have
  205. a system with only one CPU, like most personal computers, say N. If
  206. you have a system with more than one CPU, say Y.
  207. If you say N here, the kernel will run on single and multiprocessor
  208. machines, but will use only one CPU of a multiprocessor machine. If
  209. you say Y here, the kernel will run on many, but not all,
  210. singleprocessor machines. On a singleprocessor machine, the kernel
  211. will run faster if you say N here.
  212. If you don't know what to do here, say N.
  213. config SCHED_SMT
  214. bool "SMT (Hyperthreading) scheduler support"
  215. depends on SMP
  216. default n
  217. help
  218. SMT scheduler support improves the CPU scheduler's decision making
  219. when dealing with Intel Pentium 4 chips with HyperThreading at a
  220. cost of slightly increased overhead in some places. If unsure say
  221. N here.
  222. config SCHED_MC
  223. bool "Multi-core scheduler support"
  224. depends on SMP
  225. default y
  226. help
  227. Multi-core scheduler support improves the CPU scheduler's decision
  228. making when dealing with multi-core CPU chips at a cost of slightly
  229. increased overhead in some places. If unsure say N here.
  230. source "kernel/Kconfig.preempt"
  231. config NUMA
  232. bool "Non Uniform Memory Access (NUMA) Support"
  233. depends on SMP
  234. help
  235. Enable NUMA (Non Uniform Memory Access) support. The kernel
  236. will try to allocate memory used by a CPU on the local memory
  237. controller of the CPU and add some more NUMA awareness to the kernel.
  238. This code is recommended on all multiprocessor Opteron systems.
  239. If the system is EM64T, you should say N unless your system is EM64T
  240. NUMA.
  241. config K8_NUMA
  242. bool "Old style AMD Opteron NUMA detection"
  243. depends on NUMA && PCI
  244. default y
  245. help
  246. Enable K8 NUMA node topology detection. You should say Y here if
  247. you have a multi processor AMD K8 system. This uses an old
  248. method to read the NUMA configuration directly from the builtin
  249. Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
  250. instead, which also takes priority if both are compiled in.
  251. config NODES_SHIFT
  252. int
  253. default "6"
  254. depends on NEED_MULTIPLE_NODES
  255. # Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
  256. config X86_64_ACPI_NUMA
  257. bool "ACPI NUMA detection"
  258. depends on NUMA
  259. select ACPI
  260. select PCI
  261. select ACPI_NUMA
  262. default y
  263. help
  264. Enable ACPI SRAT based node topology detection.
  265. config NUMA_EMU
  266. bool "NUMA emulation"
  267. depends on NUMA
  268. help
  269. Enable NUMA emulation. A flat machine will be split
  270. into virtual nodes when booted with "numa=fake=N", where N is the
  271. number of nodes. This is only useful for debugging.
  272. config ARCH_DISCONTIGMEM_ENABLE
  273. bool
  274. depends on NUMA
  275. default y
  276. config ARCH_DISCONTIGMEM_ENABLE
  277. def_bool y
  278. depends on NUMA
  279. config ARCH_DISCONTIGMEM_DEFAULT
  280. def_bool y
  281. depends on NUMA
  282. config ARCH_SPARSEMEM_ENABLE
  283. def_bool y
  284. depends on (NUMA || EXPERIMENTAL)
  285. config ARCH_MEMORY_PROBE
  286. def_bool y
  287. depends on MEMORY_HOTPLUG
  288. config ARCH_FLATMEM_ENABLE
  289. def_bool y
  290. depends on !NUMA
  291. source "mm/Kconfig"
  292. config MEMORY_HOTPLUG_RESERVE
  293. def_bool y
  294. depends on (MEMORY_HOTPLUG && DISCONTIGMEM)
  295. config HAVE_ARCH_EARLY_PFN_TO_NID
  296. def_bool y
  297. depends on NUMA
  298. config OUT_OF_LINE_PFN_TO_PAGE
  299. def_bool y
  300. depends on DISCONTIGMEM
  301. config NR_CPUS
  302. int "Maximum number of CPUs (2-256)"
  303. range 2 255
  304. depends on SMP
  305. default "8"
  306. help
  307. This allows you to specify the maximum number of CPUs which this
  308. kernel will support. Current maximum is 256 CPUs due to
  309. APIC addressing limits. Less depending on the hardware.
  310. This is purely to save memory - each supported CPU requires
  311. memory in the static kernel configuration.
  312. config HOTPLUG_CPU
  313. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  314. depends on SMP && HOTPLUG && EXPERIMENTAL
  315. help
  316. Say Y here to experiment with turning CPUs off and on. CPUs
  317. can be controlled through /sys/devices/system/cpu/cpu#.
  318. Say N if you want to disable CPU hotplug.
  319. config ARCH_ENABLE_MEMORY_HOTPLUG
  320. def_bool y
  321. config HPET_TIMER
  322. bool
  323. default y
  324. help
  325. Use the IA-PC HPET (High Precision Event Timer) to manage
  326. time in preference to the PIT and RTC, if a HPET is
  327. present. The HPET provides a stable time base on SMP
  328. systems, unlike the TSC, but it is more expensive to access,
  329. as it is off-chip. You can find the HPET spec at
  330. <http://www.intel.com/hardwaredesign/hpetspec.htm>.
  331. config HPET_EMULATE_RTC
  332. bool "Provide RTC interrupt"
  333. depends on HPET_TIMER && RTC=y
  334. # Mark as embedded because too many people got it wrong.
  335. # The code disables itself when not needed.
  336. config IOMMU
  337. bool "IOMMU support" if EMBEDDED
  338. default y
  339. select SWIOTLB
  340. select AGP
  341. depends on PCI
  342. help
  343. Support for full DMA access of devices with 32bit memory access only
  344. on systems with more than 3GB. This is usually needed for USB,
  345. sound, many IDE/SATA chipsets and some other devices.
  346. Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
  347. based IOMMU and a software bounce buffer based IOMMU used on Intel
  348. systems and as fallback.
  349. The code is only active when needed (enough memory and limited
  350. device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
  351. too.
  352. config CALGARY_IOMMU
  353. bool "IBM Calgary IOMMU support"
  354. select SWIOTLB
  355. depends on PCI && EXPERIMENTAL
  356. help
  357. Support for hardware IOMMUs in IBM's xSeries x366 and x460
  358. systems. Needed to run systems with more than 3GB of memory
  359. properly with 32-bit PCI devices that do not support DAC
  360. (Double Address Cycle). Calgary also supports bus level
  361. isolation, where all DMAs pass through the IOMMU. This
  362. prevents them from going anywhere except their intended
  363. destination. This catches hard-to-find kernel bugs and
  364. mis-behaving drivers and devices that do not use the DMA-API
  365. properly to set up their DMA buffers. The IOMMU can be
  366. turned off at boot time with the iommu=off parameter.
  367. Normally the kernel will make the right choice by itself.
  368. If unsure, say Y.
  369. # need this always selected by IOMMU for the VIA workaround
  370. config SWIOTLB
  371. bool
  372. config X86_MCE
  373. bool "Machine check support" if EMBEDDED
  374. default y
  375. help
  376. Include a machine check error handler to report hardware errors.
  377. This version will require the mcelog utility to decode some
  378. machine check error logs. See
  379. ftp://ftp.x86-64.org/pub/linux/tools/mcelog
  380. config X86_MCE_INTEL
  381. bool "Intel MCE features"
  382. depends on X86_MCE && X86_LOCAL_APIC
  383. default y
  384. help
  385. Additional support for intel specific MCE features such as
  386. the thermal monitor.
  387. config X86_MCE_AMD
  388. bool "AMD MCE features"
  389. depends on X86_MCE && X86_LOCAL_APIC
  390. default y
  391. help
  392. Additional support for AMD specific MCE features such as
  393. the DRAM Error Threshold.
  394. config KEXEC
  395. bool "kexec system call"
  396. help
  397. kexec is a system call that implements the ability to shutdown your
  398. current kernel, and to start another kernel. It is like a reboot
  399. but it is independent of the system firmware. And like a reboot
  400. you can start any kernel with it, not just Linux.
  401. The name comes from the similarity to the exec system call.
  402. It is an ongoing process to be certain the hardware in a machine
  403. is properly shutdown, so do not be surprised if this code does not
  404. initially work for you. It may help to enable device hotplugging
  405. support. As of this writing the exact hardware interface is
  406. strongly in flux, so no good recommendation can be made.
  407. config CRASH_DUMP
  408. bool "kernel crash dumps (EXPERIMENTAL)"
  409. depends on EXPERIMENTAL
  410. help
  411. Generate crash dump after being started by kexec.
  412. This should be normally only set in special crash dump kernels
  413. which are loaded in the main kernel with kexec-tools into
  414. a specially reserved region and then later executed after
  415. a crash by kdump/kexec. The crash dump kernel must be compiled
  416. to a memory address not used by the main kernel or BIOS using
  417. PHYSICAL_START.
  418. For more details see Documentation/kdump/kdump.txt
  419. config PHYSICAL_START
  420. hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
  421. default "0x1000000" if CRASH_DUMP
  422. default "0x200000"
  423. help
  424. This gives the physical address where the kernel is loaded. Normally
  425. for regular kernels this value is 0x200000 (2MB). But in the case
  426. of kexec on panic the fail safe kernel needs to run at a different
  427. address than the panic-ed kernel. This option is used to set the load
  428. address for kernels used to capture crash dump on being kexec'ed
  429. after panic. The default value for crash dump kernels is
  430. 0x1000000 (16MB). This can also be set based on the "X" value as
  431. specified in the "crashkernel=YM@XM" command line boot parameter
  432. passed to the panic-ed kernel. Typically this parameter is set as
  433. crashkernel=64M@16M. Please take a look at
  434. Documentation/kdump/kdump.txt for more details about crash dumps.
  435. Don't change this unless you know what you are doing.
  436. config SECCOMP
  437. bool "Enable seccomp to safely compute untrusted bytecode"
  438. depends on PROC_FS
  439. default y
  440. help
  441. This kernel feature is useful for number crunching applications
  442. that may need to compute untrusted bytecode during their
  443. execution. By using pipes or other transports made available to
  444. the process as file descriptors supporting the read/write
  445. syscalls, it's possible to isolate those applications in
  446. their own address space using seccomp. Once seccomp is
  447. enabled via /proc/<pid>/seccomp, it cannot be disabled
  448. and the task is only allowed to execute a few safe syscalls
  449. defined by each seccomp mode.
  450. If unsure, say Y. Only embedded should say N here.
  451. config CC_STACKPROTECTOR
  452. bool "Enable -fstack-protector buffer overflow detection (EXPRIMENTAL)"
  453. depends on EXPERIMENTAL
  454. help
  455. This option turns on the -fstack-protector GCC feature. This
  456. feature puts, at the beginning of critical functions, a canary
  457. value on the stack just before the return address, and validates
  458. the value just before actually returning. Stack based buffer
  459. overflows (that need to overwrite this return address) now also
  460. overwrite the canary, which gets detected and the attack is then
  461. neutralized via a kernel panic.
  462. This feature requires gcc version 4.2 or above, or a distribution
  463. gcc with the feature backported. Older versions are automatically
  464. detected and for those versions, this configuration option is ignored.
  465. config CC_STACKPROTECTOR_ALL
  466. bool "Use stack-protector for all functions"
  467. depends on CC_STACKPROTECTOR
  468. help
  469. Normally, GCC only inserts the canary value protection for
  470. functions that use large-ish on-stack buffers. By enabling
  471. this option, GCC will be asked to do this for ALL functions.
  472. source kernel/Kconfig.hz
  473. config REORDER
  474. bool "Function reordering"
  475. default n
  476. help
  477. This option enables the toolchain to reorder functions for a more
  478. optimal TLB usage. If you have pretty much any version of binutils,
  479. this can increase your kernel build time by roughly one minute.
  480. config K8_NB
  481. def_bool y
  482. depends on AGP_AMD64 || IOMMU || (PCI && NUMA)
  483. endmenu
  484. #
  485. # Use the generic interrupt handling code in kernel/irq/:
  486. #
  487. config GENERIC_HARDIRQS
  488. bool
  489. default y
  490. config GENERIC_IRQ_PROBE
  491. bool
  492. default y
  493. # we have no ISA slots, but we do have ISA-style DMA.
  494. config ISA_DMA_API
  495. bool
  496. default y
  497. config GENERIC_PENDING_IRQ
  498. bool
  499. depends on GENERIC_HARDIRQS && SMP
  500. default y
  501. menu "Power management options"
  502. source kernel/power/Kconfig
  503. source "drivers/acpi/Kconfig"
  504. source "arch/x86_64/kernel/cpufreq/Kconfig"
  505. endmenu
  506. menu "Bus options (PCI etc.)"
  507. config PCI
  508. bool "PCI support"
  509. # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
  510. config PCI_DIRECT
  511. bool
  512. depends on PCI
  513. default y
  514. config PCI_MMCONFIG
  515. bool "Support mmconfig PCI config space access"
  516. depends on PCI && ACPI
  517. source "drivers/pci/pcie/Kconfig"
  518. source "drivers/pci/Kconfig"
  519. source "drivers/pcmcia/Kconfig"
  520. source "drivers/pci/hotplug/Kconfig"
  521. endmenu
  522. menu "Executable file formats / Emulations"
  523. source "fs/Kconfig.binfmt"
  524. config IA32_EMULATION
  525. bool "IA32 Emulation"
  526. help
  527. Include code to run 32-bit programs under a 64-bit kernel. You should likely
  528. turn this on, unless you're 100% sure that you don't have any 32-bit programs
  529. left.
  530. config IA32_AOUT
  531. tristate "IA32 a.out support"
  532. depends on IA32_EMULATION
  533. help
  534. Support old a.out binaries in the 32bit emulation.
  535. config COMPAT
  536. bool
  537. depends on IA32_EMULATION
  538. default y
  539. config SYSVIPC_COMPAT
  540. bool
  541. depends on COMPAT && SYSVIPC
  542. default y
  543. endmenu
  544. source "net/Kconfig"
  545. source drivers/Kconfig
  546. source "drivers/firmware/Kconfig"
  547. source fs/Kconfig
  548. menu "Instrumentation Support"
  549. depends on EXPERIMENTAL
  550. source "arch/x86_64/oprofile/Kconfig"
  551. config KPROBES
  552. bool "Kprobes (EXPERIMENTAL)"
  553. depends on KALLSYMS && EXPERIMENTAL && MODULES
  554. help
  555. Kprobes allows you to trap at almost any kernel address and
  556. execute a callback function. register_kprobe() establishes
  557. a probepoint and specifies the callback. Kprobes is useful
  558. for kernel debugging, non-intrusive instrumentation and testing.
  559. If in doubt, say "N".
  560. endmenu
  561. source "arch/x86_64/Kconfig.debug"
  562. source "security/Kconfig"
  563. source "crypto/Kconfig"
  564. source "lib/Kconfig"