kconfig

linux 内核源代码

# x86 configuration
mainmenu "Linux Kernel Configuration for x86"

# Select 32 or 64 bit
config 64BIT
	bool "64-bit kernel" if ARCH = "x86"
	default ARCH = "x86_64"
	help
	  Say yes to build a 64-bit kernel - formerly known as x86_64
	  Say no to build a 32-bit kernel - formerly known as i386

config X86_32
	def_bool !64BIT

config X86_64
	def_bool 64BIT

### Arch settings
config X86
	bool
	default y

config GENERIC_TIME
	bool
	default y

config GENERIC_CMOS_UPDATE
	bool
	default y

config CLOCKSOURCE_WATCHDOG
	bool
	default y

config GENERIC_CLOCKEVENTS
	bool
	default y

config GENERIC_CLOCKEVENTS_BROADCAST
	bool
	default y
	depends on X86_64 || (X86_32 && X86_LOCAL_APIC)

config LOCKDEP_SUPPORT
	bool
	default y

config STACKTRACE_SUPPORT
	bool
	default y

config SEMAPHORE_SLEEPERS
	bool
	default y

config MMU
	bool
	default y

config ZONE_DMA
	bool
	default y

config QUICKLIST
	bool
	default X86_32

config SBUS
	bool

config GENERIC_ISA_DMA
	bool
	default y

config GENERIC_IOMAP
	bool
	default y

config GENERIC_BUG
	bool
	default y
	depends on BUG

config GENERIC_HWEIGHT
	bool
	default y

config ARCH_MAY_HAVE_PC_FDC
	bool
	default y

config DMI
	bool
	default y

config RWSEM_GENERIC_SPINLOCK
	def_bool !X86_XADD

config RWSEM_XCHGADD_ALGORITHM
	def_bool X86_XADD

config ARCH_HAS_ILOG2_U32
	def_bool n

config ARCH_HAS_ILOG2_U64
	def_bool n

config GENERIC_CALIBRATE_DELAY
	def_bool y

config GENERIC_TIME_VSYSCALL
	bool
	default X86_64

config ARCH_SUPPORTS_OPROFILE
	bool
	default y


config ZONE_DMA32
	bool
	default X86_64

config ARCH_POPULATES_NODE_MAP
	def_bool y

config AUDIT_ARCH
	bool
	default X86_64

# Use the generic interrupt handling code in kernel/irq/:
config GENERIC_HARDIRQS
	bool
	default y

config GENERIC_IRQ_PROBE
	bool
	default y

config GENERIC_PENDING_IRQ
	bool
	depends on GENERIC_HARDIRQS && SMP
	default y

config X86_SMP
	bool
	depends on X86_32 && SMP && !X86_VOYAGER
	default y

config X86_HT
	bool
	depends on SMP
	depends on (X86_32 && !(X86_VISWS || X86_VOYAGER)) || (X86_64 && !MK8)
	default y

config X86_BIOS_REBOOT
	bool
	depends on X86_32 && !(X86_VISWS || X86_VOYAGER)
	default y

config X86_TRAMPOLINE
	bool
	depends on X86_SMP || (X86_VOYAGER && SMP)
	default y

config KTIME_SCALAR
	def_bool X86_32
source "init/Kconfig"

menu "Processor type and features"

source "kernel/time/Kconfig"

config SMP
	bool "Symmetric multi-processing support"
	---help---
	  This enables support for systems with more than one CPU. If you have
	  a system with only one CPU, like most personal computers, say N. If
	  you have a system with more than one CPU, say Y.

	  If you say N here, the kernel will run on single and multiprocessor
	  machines, but will use only one CPU of a multiprocessor machine. If
	  you say Y here, the kernel will run on many, but not all,
	  singleprocessor machines. On a singleprocessor machine, the kernel
	  will run faster if you say N here.

	  Note that if you say Y here and choose architecture "586" or
	  "Pentium" under "Processor family", the kernel will not work on 486
	  architectures. Similarly, multiprocessor kernels for the "PPro"
	  architecture may not work on all Pentium based boards.

	  People using multiprocessor machines who say Y here should also say
	  Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
	  Management" code will be disabled if you say Y here.

	  See also the <file:Documentation/smp.txt>,
	  <file:Documentation/i386/IO-APIC.txt>,
	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
	  <http://www.tldp.org/docs.html#howto>.

	  If you don't know what to do here, say N.

choice
	prompt "Subarchitecture Type"
	default X86_PC

config X86_PC
	bool "PC-compatible"
	help
	  Choose this option if your computer is a standard PC or compatible.

config X86_ELAN
	bool "AMD Elan"
	depends on X86_32
	help
	  Select this for an AMD Elan processor.

	  Do not use this option for K6/Athlon/Opteron processors!

	  If unsure, choose "PC-compatible" instead.

config X86_VOYAGER
	bool "Voyager (NCR)"
	depends on X86_32
	select SMP if !BROKEN
	help
	  Voyager is an MCA-based 32-way capable SMP architecture proprietary
	  to NCR Corp.  Machine classes 345x/35xx/4100/51xx are Voyager-based.

	  *** WARNING ***

	  If you do not specifically know you have a Voyager based machine,
	  say N here, otherwise the kernel you build will not be bootable.

config X86_NUMAQ
	bool "NUMAQ (IBM/Sequent)"
	select SMP
	select NUMA
	depends on X86_32
	help
	  This option is used for getting Linux to run on a (IBM/Sequent) NUMA
	  multiquad box. This changes the way that processors are bootstrapped,
	  and uses Clustered Logical APIC addressing mode instead of Flat Logical.
	  You will need a new lynxer.elf file to flash your firmware with - send
	  email to <[e-mail]>.

config X86_SUMMIT
	bool "Summit/EXA (IBM x440)"
	depends on X86_32 && SMP
	help
	  This option is needed for IBM systems that use the Summit/EXA chipset.
	  In particular, it is needed for the x440.

	  If you don't have one of these computers, you should say N here.
	  If you want to build a NUMA kernel, you must select ACPI.

config X86_BIGSMP
	bool "Support for other sub-arch SMP systems with more than 8 CPUs"
	depends on X86_32 && SMP
	help
	  This option is needed for the systems that have more than 8 CPUs
	  and if the system is not of any sub-arch type above.

	  If you don't have such a system, you should say N here.

config X86_VISWS
	bool "SGI 320/540 (Visual Workstation)"
	depends on X86_32
	help
	  The SGI Visual Workstation series is an IA32-based workstation
	  based on SGI systems chips with some legacy PC hardware attached.

	  Say Y here to create a kernel to run on the SGI 320 or 540.

	  A kernel compiled for the Visual Workstation will not run on PCs
	  and vice versa. See <file:Documentation/sgi-visws.txt> for details.

config X86_GENERICARCH
       bool "Generic architecture (Summit, bigsmp, ES7000, default)"
	depends on X86_32
       help
          This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
	  It is intended for a generic binary kernel.
	  If you want a NUMA kernel, select ACPI.   We need SRAT for NUMA.

config X86_ES7000
	bool "Support for Unisys ES7000 IA32 series"
	depends on X86_32 && SMP
	help
	  Support for Unisys ES7000 systems.  Say 'Y' here if this kernel is
	  supposed to run on an IA32-based Unisys ES7000 system.
	  Only choose this option if you have such a system, otherwise you
	  should say N here.

config X86_VSMP
	bool "Support for ScaleMP vSMP"
	depends on X86_64 && PCI
	 help
	  Support for ScaleMP vSMP systems.  Say 'Y' here if this kernel is
	  supposed to run on these EM64T-based machines.  Only choose this option
	  if you have one of these machines.

endchoice

config SCHED_NO_NO_OMIT_FRAME_POINTER
	bool "Single-depth WCHAN output"
	default y
	depends on X86_32
	help
	  Calculate simpler /proc/<PID>/wchan values. If this option
	  is disabled then wchan values will recurse back to the
	  caller function. This provides more accurate wchan values,
	  at the expense of slightly more scheduling overhead.

	  If in doubt, say "Y".

config PARAVIRT
	bool
	depends on X86_32 && !(X86_VISWS || X86_VOYAGER)
	help
	  This changes the kernel so it can modify itself when it is run
	  under a hypervisor, potentially improving performance significantly
	  over full virtualization.  However, when run without a hypervisor
	  the kernel is theoretically slower and slightly larger.

menuconfig PARAVIRT_GUEST
	bool "Paravirtualized guest support"
	depends on X86_32
	help
	  Say Y here to get to see options related to running Linux under
	  various hypervisors.  This option alone does not add any kernel code.

	  If you say N, all options in this submenu will be skipped and disabled.

if PARAVIRT_GUEST

source "arch/x86/xen/Kconfig"

config VMI
	bool "VMI Guest support"
	select PARAVIRT
	depends on !(X86_VISWS || X86_VOYAGER)
	help
	  VMI provides a paravirtualized interface to the VMware ESX server
	  (it could be used by other hypervisors in theory too, but is not
	  at the moment), by linking the kernel to a GPL-ed ROM module
	  provided by the hypervisor.

source "arch/x86/lguest/Kconfig"

endif

config ACPI_SRAT
	bool
	default y
	depends on X86_32 && ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH)
	select ACPI_NUMA

config HAVE_ARCH_PARSE_SRAT
       bool
       default y
       depends on ACPI_SRAT

config X86_SUMMIT_NUMA
	bool
	default y
	depends on X86_32 && NUMA && (X86_SUMMIT || X86_GENERICARCH)

config X86_CYCLONE_TIMER
	bool
	default y
	depends on X86_32 && X86_SUMMIT || X86_GENERICARCH

config ES7000_CLUSTERED_APIC
	bool
	default y
	depends on SMP && X86_ES7000 && MPENTIUMIII

source "arch/x86/Kconfig.cpu"

config HPET_TIMER
	bool
	prompt "HPET Timer Support" if X86_32
	default X86_64
	help
         Use the IA-PC HPET (High Precision Event Timer) to manage
         time in preference to the PIT and RTC, if a HPET is
         present.
         HPET is the next generation timer replacing legacy 8254s.
         The HPET provides a stable time base on SMP
         systems, unlike the TSC, but it is more expensive to access,
         as it is off-chip.  You can find the HPET spec at
         <http://www.intel.com/hardwaredesign/hpetspec.htm>.

         You can safely choose Y here.  However, HPET will only be
         activated if the platform and the BIOS support this feature.
         Otherwise the 8254 will be used for timing services.

         Choose N to continue using the legacy 8254 timer.

config HPET_EMULATE_RTC
	bool
	depends on HPET_TIMER && RTC=y
	default y

# Mark as embedded because too many people got it wrong.