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