Merge with Linux 2.5.74.

[linux-2.6/linux-mips.git] / arch / i386 / Kconfig

#
# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
#

mainmenu "Linux Kernel Configuration"

config X86
        bool
        default y
        help
          This is Linux's home port.  Linux was originally native to the Intel
          386, and runs on all the later x86 processors including the Intel
          486, 586, Pentiums, and various instruction-set-compatible chips by
          AMD, Cyrix, and others.

config MMU
        bool
        default y

config SBUS
        bool

config UID16
        bool
        default y

config GENERIC_ISA_DMA
        bool
        default y

source "init/Kconfig"


menu "Processor type and features"

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_VOYAGER
        bool "Voyager (NCR)"
        help
          Voyager is a 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)"
        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 Martin.Bligh@us.ibm.com

config X86_SUMMIT
        bool "Summit/EXA (IBM x440)"
        depends on 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.

config X86_BIGSMP
        bool "Support for other sub-arch SMP systems with more than 8 CPUs"
        depends on 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)"
        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, default)"
       depends on SMP
       help
          This option compiles in the Summit, bigsmp, default subarchitectures.
          It is intended for a generic binary kernel.

config X86_ES7000
        bool "Support for Unisys ES7000 IA32 series"
        depends on 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.

endchoice

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

config X86_CYCLONE_TIMER
       bool 
       default y
       depends on X86_SUMMIT || X86_GENERICARCH

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

choice
        prompt "Processor family"
        default M686

config M386
        bool "386"
        ---help---
          This is the processor type of your CPU. This information is used for
          optimizing purposes. In order to compile a kernel that can run on
          all x86 CPU types (albeit not optimally fast), you can specify
          "386" here.

          The kernel will not necessarily run on earlier architectures than
          the one you have chosen, e.g. a Pentium optimized kernel will run on
          a PPro, but not necessarily on a i486.

          Here are the settings recommended for greatest speed:
          - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
          486DLC/DLC2, UMC 486SX-S and NexGen Nx586.  Only "386" kernels
          will run on a 386 class machine.
          - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
          SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
          - "586" for generic Pentium CPUs lacking the TSC
          (time stamp counter) register.
          - "Pentium-Classic" for the Intel Pentium.
          - "Pentium-MMX" for the Intel Pentium MMX.
          - "Pentium-Pro" for the Intel Pentium Pro.
          - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
          - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
          - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
          - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
          - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
          - "Crusoe" for the Transmeta Crusoe series.
          - "Winchip-C6" for original IDT Winchip.
          - "Winchip-2" for IDT Winchip 2.
          - "Winchip-2A" for IDT Winchips with 3dNow! capabilities.
          - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
          - "VIA C3-2 for VIA C3-2 "Nehemiah" (model 9 and above).

          If you don't know what to do, choose "386".

config M486
        bool "486"
        help
          Select this for a 486 series processor, either Intel or one of the
          compatible processors from AMD, Cyrix, IBM, or Intel.  Includes DX,
          DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
          U5S.

config M586
        bool "586/K5/5x86/6x86/6x86MX"
        help
          Select this for an 586 or 686 series processor such as the AMD K5,
          the Intel 5x86 or 6x86, or the Intel 6x86MX.  This choice does not
          assume the RDTSC (Read Time Stamp Counter) instruction.

config M586TSC
        bool "Pentium-Classic"
        help
          Select this for a Pentium Classic processor with the RDTSC (Read
          Time Stamp Counter) instruction for benchmarking.

config M586MMX
        bool "Pentium-MMX"
        help
          Select this for a Pentium with the MMX graphics/multimedia
          extended instructions.

config M686
        bool "Pentium-Pro"
        help
          Select this for Intel Pentium Pro chips.  This enables the use of
          Pentium Pro extended instructions, and disables the init-time guard
          against the f00f bug found in earlier Pentiums.

config MPENTIUMII
        bool "Pentium-II/Celeron(pre-Coppermine)"
        help
          Select this for Intel chips based on the Pentium-II and
          pre-Coppermine Celeron core.  This option enables an unaligned
          copy optimization, compiles the kernel with optimization flags
          tailored for the chip, and applies any applicable Pentium Pro
          optimizations.

config MPENTIUMIII
        bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
        help
          Select this for Intel chips based on the Pentium-III and
          Celeron-Coppermine core.  This option enables use of some
          extended prefetch instructions in addition to the Pentium II
          extensions.

config MPENTIUM4
        bool "Pentium-4/Celeron(P4-based)/Xeon"
        help
          Select this for Intel Pentium 4 chips.  This includes both
          the Pentium 4 and P4-based Celeron chips.  This option
          enables compile flags optimized for the chip, uses the
          correct cache shift, and applies any applicable Pentium III
          optimizations.

config MK6
        bool "K6/K6-II/K6-III"
        help
          Select this for an AMD K6-family processor.  Enables use of
          some extended instructions, and passes appropriate optimization
          flags to GCC.

config MK7
        bool "Athlon/Duron/K7"
        help
          Select this for an AMD Athlon K7-family processor.  Enables use of
          some extended instructions, and passes appropriate optimization
          flags to GCC.

config MK8
        bool "Opteron/Athlon64/Hammer/K8"
        help
          Select this for an AMD Opteron or Athlon64 Hammer-family processor.  Enables
          use of some extended instructions, and passes appropriate optimization
          flags to GCC.

config MELAN
        bool "Elan"

config MCRUSOE
        bool "Crusoe"
        help
          Select this for a Transmeta Crusoe processor.  Treats the processor
          like a 586 with TSC, and sets some GCC optimization flags (like a
          Pentium Pro with no alignment requirements).

config MWINCHIPC6
        bool "Winchip-C6"
        help
          Select this for an IDT Winchip C6 chip.  Linux and GCC
          treat this chip as a 586TSC with some extended instructions
          and alignment requirements.

config MWINCHIP2
        bool "Winchip-2"
        help
          Select this for an IDT Winchip-2.  Linux and GCC
          treat this chip as a 586TSC with some extended instructions
          and alignment requirements.

config MWINCHIP3D
        bool "Winchip-2A/Winchip-3"
        help
          Select this for an IDT Winchip-2A or 3.  Linux and GCC
          treat this chip as a 586TSC with some extended instructions
          and alignment reqirements.  Development kernels also enable
          out of order memory stores for this CPU, which can increase
          performance of some operations.

config MCYRIXIII
        bool "CyrixIII/VIA-C3"
        help
          Select this for a Cyrix III or C3 chip.  Presently Linux and GCC
          treat this chip as a generic 586. Whilst the CPU is 686 class,
          it lacks the cmov extension which gcc assumes is present when
          generating 686 code.
          Note that Nehemiah (Model 9) and above will not boot with this
          kernel due to them lacking the 3DNow! instructions used in earlier
          incarnations of the CPU.

config MVIAC3_2
        bool "VIA C3-2 (Nehemiah)"
        help
          Select this for a VIA C3 "Nehemiah". Selecting this enables usage
          of SSE and tells gcc to treat the CPU as a 686.
          Note, this kernel will not boot on older (pre model 9) C3s.

endchoice

config X86_GENERIC
       bool "Generic x86 support" 
       help
          Including some tuning for non selected x86 CPUs too.
          when it has moderate overhead. This is intended for generic 
          distributions kernels.

#
# Define implied options from the CPU selection here
#
config X86_CMPXCHG
        bool
        depends on !M386
        default y

config X86_XADD
        bool
        depends on !M386
        default y

config X86_L1_CACHE_SHIFT
        int
        default "7" if MPENTIUM4 || X86_GENERIC
        default "4" if MELAN || M486 || M386
        default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2
        default "6" if MK7 || MK8

config RWSEM_GENERIC_SPINLOCK
        bool
        depends on M386
        default y

config RWSEM_XCHGADD_ALGORITHM
        bool
        depends on !M386
        default y

config X86_PPRO_FENCE
        bool
        depends on M686 || M586MMX || M586TSC || M586 || M486 || M386
        default y

config X86_F00F_BUG
        bool
        depends on M586MMX || M586TSC || M586 || M486 || M386
        default y

config X86_WP_WORKS_OK
        bool
        depends on !M386
        default y

config X86_INVLPG
        bool
        depends on !M386
        default y

config X86_BSWAP
        bool
        depends on !M386
        default y

config X86_POPAD_OK
        bool
        depends on !M386
        default y

config X86_ALIGNMENT_16
        bool
        depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2
        default y

config X86_GOOD_APIC
        bool
        depends on MK7 || MPENTIUM4 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || MK8
        default y

config X86_INTEL_USERCOPY
        bool
        depends on MPENTIUM4 || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7
        default y

config X86_USE_PPRO_CHECKSUM
        bool
        depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2
        default y

config X86_USE_3DNOW
        bool
        depends on MCYRIXIII || MK7
        default y

config X86_OOSTORE
        bool
        depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6
        default y

config HUGETLB_PAGE
        bool "Huge TLB Page Support"
        help
          This enables support for huge pages.  User space applications
          can make use of this support with the sys_alloc_hugepages and
          sys_free_hugepages system calls.  If your applications are
          huge page aware and your processor (Pentium or later for x86)
          supports this, then say Y here.

          Otherwise, say N.

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.tex>,
          <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.

config NR_CPUS
        int "Maximum number of CPUs (2-32)"
        depends on SMP
        default "32"
        help
          This allows you to specify the maximum number of CPUs which this
          kernel will support.  The maximum supported value is 32 and the
          minimum value which makes sense is 2.

          This is purely to save memory - each supported CPU adds
          approximately eight kilobytes to the kernel image.

config PREEMPT
        bool "Preemptible Kernel"
        help
          This option reduces the latency of the kernel when reacting to
          real-time or interactive events by allowing a low priority process to
          be preempted even if it is in kernel mode executing a system call.
          This allows applications to run more reliably even when the system is
          under load.

          Say Y here if you are building a kernel for a desktop, embedded
          or real-time system.  Say N if you are unsure.

config X86_UP_APIC
        bool "Local APIC support on uniprocessors" if !SMP
        depends on !(X86_VISWS || X86_VOYAGER)
        ---help---
          A local APIC (Advanced Programmable Interrupt Controller) is an
          integrated interrupt controller in the CPU. If you have a single-CPU
          system which has a processor with a local APIC, you can say Y here to
          enable and use it. If you say Y here even though your machine doesn't
          have a local APIC, then the kernel will still run with no slowdown at
          all. The local APIC supports CPU-generated self-interrupts (timer,
          performance counters), and the NMI watchdog which detects hard
          lockups.

          If you have a system with several CPUs, you do not need to say Y
          here: the local APIC will be used automatically.

config X86_UP_IOAPIC
        bool "IO-APIC support on uniprocessors"
        depends on !SMP && X86_UP_APIC
        help
          An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
          SMP-capable replacement for PC-style interrupt controllers. Most
          SMP systems and a small number of uniprocessor systems have one.
          If you have a single-CPU system with an IO-APIC, you can say Y here
          to use it. If you say Y here even though your machine doesn't have
          an IO-APIC, then the kernel will still run with no slowdown at all.

          If you have a system with several CPUs, you do not need to say Y
          here: the IO-APIC will be used automatically.

config X86_LOCAL_APIC
        bool
        depends on !SMP && X86_UP_APIC
        default y

config X86_IO_APIC
        bool
        depends on !SMP && X86_UP_IOAPIC
        default y

config X86_TSC
        bool
        depends on (MWINCHIP3D || MWINCHIP2 || MCRUSOE || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2) && !X86_NUMAQ
        default y

config X86_MCE
        bool "Machine Check Exception"
        ---help---
          Machine Check Exception support allows the processor to notify the
          kernel if it detects a problem (e.g. overheating, component failure).
          The action the kernel takes depends on the severity of the problem,
          ranging from a warning message on the console, to halting the machine.
          Your processor must be a Pentium or newer to support this - check the
          flags in /proc/cpuinfo for mce.  Note that some older Pentium systems
          have a design flaw which leads to false MCE events - hence MCE is
          disabled on all P5 processors, unless explicitly enabled with "mce"
          as a boot argument.  Similarly, if MCE is built in and creates a
          problem on some new non-standard machine, you can boot with "nomce"
          to disable it.  MCE support simply ignores non-MCE processors like
          the 386 and 486, so nearly everyone can say Y here.

config X86_MCE_NONFATAL
        bool "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
        depends on X86_MCE
        help
          Enabling this feature starts a timer that triggers every 5 seconds which
          will look at the machine check registers to see if anything happened.
          Non-fatal problems automatically get corrected (but still logged).
          Disable this if you don't want to see these messages.
          Seeing the messages this option prints out may be indicative of dying hardware,
          or out-of-spec (ie, overclocked) hardware.
          This option only does something on certain CPUs.
          (AMD Athlon/Duron and Intel Pentium 4)

config X86_MCE_P4THERMAL
        bool "check for P4 thermal throttling interrupt."
        depends on X86_MCE && (X86_UP_APIC || SMP)
        help
          Enabling this feature will cause a message to be printed when the P4
          enters thermal throttling.

config TOSHIBA
        tristate "Toshiba Laptop support"
        ---help---
          This adds a driver to safely access the System Management Mode of
          the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
          not work on models with a Phoenix BIOS. The System Management Mode
          is used to set the BIOS and power saving options on Toshiba portables.

          For information on utilities to make use of this driver see the
          Toshiba Linux utilities web site at:
          <http://www.buzzard.org.uk/toshiba/>.

          Say Y if you intend to run this kernel on a Toshiba portable.
          Say N otherwise.

config I8K
        tristate "Dell laptop support"
        ---help---
          This adds a driver to safely access the System Management Mode
          of the CPU on the Dell Inspiron 8000. The System Management Mode
          is used to read cpu temperature and cooling fan status and to
          control the fans on the I8K portables.

          This driver has been tested only on the Inspiron 8000 but it may
          also work with other Dell laptops. You can force loading on other
          models by passing the parameter `force=1' to the module. Use at
          your own risk.

          For information on utilities to make use of this driver see the
          I8K Linux utilities web site at:
          <http://www.debian.org/~dz/i8k/>

          Say Y if you intend to run this kernel on a Dell Inspiron 8000.
          Say N otherwise.

config MICROCODE
        tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
        ---help---
          If you say Y here and also to "/dev file system support" in the
          'File systems' section, you will be able to update the microcode on
          Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
          Pentium III, Pentium 4, Xeon etc.  You will obviously need the
          actual microcode binary data itself which is not shipped with the
          Linux kernel.

          For latest news and information on obtaining all the required
          ingredients for this driver, check:
          <http://www.urbanmyth.org/microcode/>.

          This driver is also available as a module ( = code which can be
          inserted in and removed from the running kernel whenever you want).
          The module will be called microcode.  If you want to compile it as
          a module, say M here and read <file:Documentation/modules.txt>.  If
          you use modprobe or kmod you may also want to add the line
          'alias char-major-10-184 microcode' to your /etc/modules.conf file.

config X86_MSR
        tristate "/dev/cpu/*/msr - Model-specific register support"
        help
          This device gives privileged processes access to the x86
          Model-Specific Registers (MSRs).  It is a character device with
          major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
          MSR accesses are directed to a specific CPU on multi-processor
          systems.

config X86_CPUID
        tristate "/dev/cpu/*/cpuid - CPU information support"
        help
          This device gives processes access to the x86 CPUID instruction to
          be executed on a specific processor.  It is a character device
          with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
          /dev/cpu/31/cpuid.

config EDD
        tristate "BIOS Enhanced Disk Drive calls determine boot disk (EXPERIMENTAL)"
        depends on EXPERIMENTAL
        help
          Say Y or M here if you want to enable BIOS Enhanced Disk Drive
          Services real mode BIOS calls to determine which disk
          BIOS tries boot from.  This information is then exported via driverfs.

          This option is experimental, but believed to be safe,
          and most disk controller BIOS vendors do not yet implement this feature.

choice
        prompt "High Memory Support"
        default NOHIGHMEM

config NOHIGHMEM
        bool "off"
        ---help---
          Linux can use up to 64 Gigabytes of physical memory on x86 systems.
          However, the address space of 32-bit x86 processors is only 4
          Gigabytes large. That means that, if you have a large amount of
          physical memory, not all of it can be "permanently mapped" by the
          kernel. The physical memory that's not permanently mapped is called
          "high memory".

          If you are compiling a kernel which will never run on a machine with
          more than 1 Gigabyte total physical RAM, answer "off" here (default
          choice and suitable for most users). This will result in a "3GB/1GB"
          split: 3GB are mapped so that each process sees a 3GB virtual memory
          space and the remaining part of the 4GB virtual memory space is used
          by the kernel to permanently map as much physical memory as
          possible.

          If the machine has between 1 and 4 Gigabytes physical RAM, then
          answer "4GB" here.

          If more than 4 Gigabytes is used then answer "64GB" here. This
          selection turns Intel PAE (Physical Address Extension) mode on.
          PAE implements 3-level paging on IA32 processors. PAE is fully
          supported by Linux, PAE mode is implemented on all recent Intel
          processors (Pentium Pro and better). NOTE: If you say "64GB" here,
          then the kernel will not boot on CPUs that don't support PAE!

          The actual amount of total physical memory will either be
          auto detected or can be forced by using a kernel command line option
          such as "mem=256M". (Try "man bootparam" or see the documentation of
          your boot loader (lilo or loadlin) about how to pass options to the
          kernel at boot time.)

          If unsure, say "off".

config HIGHMEM4G
        bool "4GB"
        help
          Select this if you have a 32-bit processor and between 1 and 4
          gigabytes of physical RAM.

config HIGHMEM64G
        bool "64GB"
        help
          Select this if you have a 32-bit processor and more than 4
          gigabytes of physical RAM.

endchoice

config HIGHMEM
        bool
        depends on HIGHMEM64G || HIGHMEM4G
        default y

config X86_PAE
        bool
        depends on HIGHMEM64G
        default y

# Common NUMA Features
config NUMA
        bool "Numa Memory Allocation Support"
        depends on SMP && HIGHMEM64G && (X86_PC || X86_NUMAQ || X86_GENERICARCH || (X86_SUMMIT && ACPI && !ACPI_HT_ONLY))
        default n if X86_PC
        default y if (X86_NUMAQ || X86_SUMMIT)

# Need comments to help the hapless user trying to turn on NUMA support
comment "NUMA (NUMA-Q) requires SMP, 64GB highmem support"
        depends on X86_NUMAQ && (!HIGHMEM64G || !SMP)

comment "NUMA (Summit) requires SMP, 64GB highmem support, full ACPI"
        depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI || ACPI_HT_ONLY)

config DISCONTIGMEM
        bool
        depends on NUMA
        default y

config HAVE_ARCH_BOOTMEM_NODE
        bool
        depends on NUMA
        default y

config HIGHPTE
        bool "Allocate 3rd-level pagetables from highmem"
        depends on HIGHMEM4G || HIGHMEM64G
        help
          The VM uses one page table entry for each page of physical memory.
          For systems with a lot of RAM, this can be wasteful of precious
          low memory.  Setting this option will put user-space page table
          entries in high memory.

config MATH_EMULATION
        bool "Math emulation"
        ---help---
          Linux can emulate a math coprocessor (used for floating point
          operations) if you don't have one. 486DX and Pentium processors have
          a math coprocessor built in, 486SX and 386 do not, unless you added
          a 487DX or 387, respectively. (The messages during boot time can
          give you some hints here ["man dmesg"].) Everyone needs either a
          coprocessor or this emulation.

          If you don't have a math coprocessor, you need to say Y here; if you
          say Y here even though you have a coprocessor, the coprocessor will
          be used nevertheless. (This behavior can be changed with the kernel
          command line option "no387", which comes handy if your coprocessor
          is broken. Try "man bootparam" or see the documentation of your boot
          loader (lilo or loadlin) about how to pass options to the kernel at
          boot time.) This means that it is a good idea to say Y here if you
          intend to use this kernel on different machines.

          More information about the internals of the Linux math coprocessor
          emulation can be found in <file:arch/i386/math-emu/README>.

          If you are not sure, say Y; apart from resulting in a 66 KB bigger
          kernel, it won't hurt.

config MTRR
        bool "MTRR (Memory Type Range Register) support"
        ---help---
          On Intel P6 family processors (Pentium Pro, Pentium II and later)
          the Memory Type Range Registers (MTRRs) may be used to control
          processor access to memory ranges. This is most useful if you have
          a video (VGA) card on a PCI or AGP bus. Enabling write-combining
          allows bus write transfers to be combined into a larger transfer
          before bursting over the PCI/AGP bus. This can increase performance
          of image write operations 2.5 times or more. Saying Y here creates a
          /proc/mtrr file which may be used to manipulate your processor's
          MTRRs. Typically the X server should use this.

          This code has a reasonably generic interface so that similar
          control registers on other processors can be easily supported
          as well:

          The Cyrix 6x86, 6x86MX and M II processors have Address Range
          Registers (ARRs) which provide a similar functionality to MTRRs. For
          these, the ARRs are used to emulate the MTRRs.
          The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
          MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
          write-combining. All of these processors are supported by this code
          and it makes sense to say Y here if you have one of them.

          Saying Y here also fixes a problem with buggy SMP BIOSes which only
          set the MTRRs for the boot CPU and not for the secondary CPUs. This
          can lead to all sorts of problems, so it's good to say Y here.

          You can safely say Y even if your machine doesn't have MTRRs, you'll
          just add about 9 KB to your kernel.

          See <file:Documentation/mtrr.txt> for more information.

config HAVE_DEC_LOCK
        bool
        depends on (SMP || PREEMPT) && X86_CMPXCHG
        default y

# turning this on wastes a bunch of space.
# Summit needs it only when NUMA is on
config BOOT_IOREMAP
        bool
        depends on ((X86_SUMMIT || X86_GENERICARCH) && NUMA)
        default y

endmenu


menu "Power management options (ACPI, APM)"
        depends on !X86_VOYAGER

config PM
        bool "Power Management support"
        ---help---
          "Power Management" means that parts of your computer are shut
          off or put into a power conserving "sleep" mode if they are not
          being used.  There are two competing standards for doing this: APM
          and ACPI.  If you want to use either one, say Y here and then also
          to the requisite support below.

          Power Management is most important for battery powered laptop
          computers; if you have a laptop, check out the Linux Laptop home
          page on the WWW at
          <http://www.cs.utexas.edu/users/kharker/linux-laptop/> and the
          Battery Powered Linux mini-HOWTO, available from
          <http://www.tldp.org/docs.html#howto>.

          Note that, even if you say N here, Linux on the x86 architecture
          will issue the hlt instruction if nothing is to be done, thereby
          sending the processor to sleep and saving power.

config SOFTWARE_SUSPEND
        bool "Software Suspend (EXPERIMENTAL)"
        depends on EXPERIMENTAL && PM && SWAP
        ---help---
          Enable the possibilty of suspendig machine. It doesn't need APM.
          You may suspend your machine by 'swsusp' or 'shutdown -z <time>' 
          (patch for sysvinit needed). 

          It creates an image which is saved in your active swaps. By the next
          booting the, pass 'resume=/path/to/your/swap/file' and kernel will 
          detect the saved image, restore the memory from
          it and then it continues to run as before you've suspended.
          If you don't want the previous state to continue use the 'noresume'
          kernel option. However note that your partitions will be fsck'd and
          you must re-mkswap your swap partitions/files.

          Right now you may boot without resuming and then later resume but
          in meantime you cannot use those swap partitions/files which were
          involved in suspending. Also in this case there is a risk that buffers
          on disk won't match with saved ones.

          SMP is supported ``as-is''. There's a code for it but doesn't work.
          There have been problems reported relating SCSI.

          This option is about getting stable. However there is still some
          absence of features.

          For more information take a look at Documentation/swsusp.txt.

source "drivers/acpi/Kconfig"

config APM
        tristate "Advanced Power Management BIOS support"
        depends on PM
        ---help---
          APM is a BIOS specification for saving power using several different
          techniques. This is mostly useful for battery powered laptops with
          APM compliant BIOSes. If you say Y here, the system time will be
          reset after a RESUME operation, the /proc/apm device will provide
          battery status information, and user-space programs will receive
          notification of APM "events" (e.g. battery status change).

          If you select "Y" here, you can disable actual use of the APM
          BIOS by passing the "apm=off" option to the kernel at boot time.

          Note that the APM support is almost completely disabled for
          machines with more than one CPU.

          In order to use APM, you will need supporting software. For location
          and more information, read <file:Documentation/pm.txt> and the
          Battery Powered Linux mini-HOWTO, available from
          <http://www.tldp.org/docs.html#howto>.

          This driver does not spin down disk drives (see the hdparm(8)
          manpage ("man 8 hdparm") for that), and it doesn't turn off
          VESA-compliant "green" monitors.

          This driver does not support the TI 4000M TravelMate and the ACER
          486/DX4/75 because they don't have compliant BIOSes. Many "green"
          desktop machines also don't have compliant BIOSes, and this driver
          may cause those machines to panic during the boot phase.

          Generally, if you don't have a battery in your machine, there isn't
          much point in using this driver and you should say N. If you get
          random kernel OOPSes or reboots that don't seem to be related to
          anything, try disabling/enabling this option (or disabling/enabling
          APM in your BIOS).

          Some other things you should try when experiencing seemingly random,
          "weird" problems:

          1) make sure that you have enough swap space and that it is
          enabled.
          2) pass the "no-hlt" option to the kernel
          3) switch on floating point emulation in the kernel and pass
          the "no387" option to the kernel
          4) pass the "floppy=nodma" option to the kernel
          5) pass the "mem=4M" option to the kernel (thereby disabling
          all but the first 4 MB of RAM)
          6) make sure that the CPU is not over clocked.
          7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
          8) disable the cache from your BIOS settings
          9) install a fan for the video card or exchange video RAM
          10) install a better fan for the CPU
          11) exchange RAM chips
          12) exchange the motherboard.

          To compile this driver as a module ( = code which can be inserted in
          and removed from the running kernel whenever you want), say M here
          and read <file:Documentation/modules.txt>. The module will be called
          apm.

config APM_IGNORE_USER_SUSPEND
        bool "Ignore USER SUSPEND"
        depends on APM
        help
          This option will ignore USER SUSPEND requests. On machines with a
          compliant APM BIOS, you want to say N. However, on the NEC Versa M
          series notebooks, it is necessary to say Y because of a BIOS bug.

config APM_DO_ENABLE
        bool "Enable PM at boot time"
        depends on APM
        ---help---
          Enable APM features at boot time. From page 36 of the APM BIOS
          specification: "When disabled, the APM BIOS does not automatically
          power manage devices, enter the Standby State, enter the Suspend
          State, or take power saving steps in response to CPU Idle calls."
          This driver will make CPU Idle calls when Linux is idle (unless this
          feature is turned off -- see "Do CPU IDLE calls", below). This
          should always save battery power, but more complicated APM features
          will be dependent on your BIOS implementation. You may need to turn
          this option off if your computer hangs at boot time when using APM
          support, or if it beeps continuously instead of suspending. Turn
          this off if you have a NEC UltraLite Versa 33/C or a Toshiba
          T400CDT. This is off by default since most machines do fine without
          this feature.

config APM_CPU_IDLE
        bool "Make CPU Idle calls when idle"
        depends on APM
        help
          Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
          On some machines, this can activate improved power savings, such as
          a slowed CPU clock rate, when the machine is idle. These idle calls
          are made after the idle loop has run for some length of time (e.g.,
          333 mS). On some machines, this will cause a hang at boot time or
          whenever the CPU becomes idle. (On machines with more than one CPU,
          this option does nothing.)

config APM_DISPLAY_BLANK
        bool "Enable console blanking using APM"
        depends on APM
        help
          Enable console blanking using the APM. Some laptops can use this to
          turn off the LCD backlight when the screen blanker of the Linux
          virtual console blanks the screen. Note that this is only used by
          the virtual console screen blanker, and won't turn off the backlight
          when using the X Window system. This also doesn't have anything to
          do with your VESA-compliant power-saving monitor. Further, this
          option doesn't work for all laptops -- it might not turn off your
          backlight at all, or it might print a lot of errors to the console,
          especially if you are using gpm.

config APM_RTC_IS_GMT
        bool "RTC stores time in GMT"
        depends on APM
        help
          Say Y here if your RTC (Real Time Clock a.k.a. hardware clock)
          stores the time in GMT (Greenwich Mean Time). Say N if your RTC
          stores localtime.

          It is in fact recommended to store GMT in your RTC, because then you
          don't have to worry about daylight savings time changes. The only
          reason not to use GMT in your RTC is if you also run a broken OS
          that doesn't understand GMT.

config APM_ALLOW_INTS
        bool "Allow interrupts during APM BIOS calls"
        depends on APM
        help
          Normally we disable external interrupts while we are making calls to
          the APM BIOS as a measure to lessen the effects of a badly behaving
          BIOS implementation.  The BIOS should reenable interrupts if it
          needs to.  Unfortunately, some BIOSes do not -- especially those in
          many of the newer IBM Thinkpads.  If you experience hangs when you
          suspend, try setting this to Y.  Otherwise, say N.

config APM_REAL_MODE_POWER_OFF
        bool "Use real mode APM BIOS call to power off"
        depends on APM
        help
          Use real mode APM BIOS calls to switch off the computer. This is
          a work-around for a number of buggy BIOSes. Switch this option on if
          your computer crashes instead of powering off properly.

source "arch/i386/kernel/cpu/cpufreq/Kconfig"

endmenu


menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)"

config X86_VISWS_APIC
        bool
        depends on X86_VISWS
        default y

config X86_LOCAL_APIC
        bool
        depends on (X86_VISWS || SMP) && !X86_VOYAGER
        default y

config X86_IO_APIC
        bool
        depends on SMP && !(X86_VISWS || X86_VOYAGER)
        default y

config PCI
        bool "PCI support" if !X86_VISWS
        depends on !X86_VOYAGER
        default y if X86_VISWS
        help
          Find out whether you have a PCI motherboard. PCI is the name of a
          bus system, i.e. the way the CPU talks to the other stuff inside
          your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
          VESA. If you have PCI, say Y, otherwise N.

          The PCI-HOWTO, available from
          <http://www.tldp.org/docs.html#howto>, contains valuable
          information about which PCI hardware does work under Linux and which
          doesn't.

choice
        prompt "PCI access mode"
        depends on PCI && !X86_VISWS
        default PCI_GOANY

config PCI_GOBIOS
        bool "BIOS"
        ---help---
          On PCI systems, the BIOS can be used to detect the PCI devices and
          determine their configuration. However, some old PCI motherboards
          have BIOS bugs and may crash if this is done. Also, some embedded
          PCI-based systems don't have any BIOS at all. Linux can also try to
          detect the PCI hardware directly without using the BIOS.

          With this option, you can specify how Linux should detect the PCI
          devices. If you choose "BIOS", the BIOS will be used, if you choose
          "Direct", the BIOS won't be used, and if you choose "Any", the
          kernel will try the direct access method and falls back to the BIOS
          if that doesn't work. If unsure, go with the default, which is
          "Any".

config PCI_GODIRECT
        bool "Direct"

config PCI_GOANY
        bool "Any"

endchoice

config PCI_BIOS
        bool
        depends on !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
        default y

config PCI_DIRECT
        bool
        depends on PCI && ((PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
        default y

source "drivers/pci/Kconfig"

config ISA
        bool "ISA support"
        depends on !(X86_VOYAGER || X86_VISWS)
        help
          Find out whether you have ISA slots on your motherboard.  ISA is the
          name of a bus system, i.e. the way the CPU talks to the other stuff
          inside your box.  Other bus systems are PCI, EISA, MicroChannel
          (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
          newer boards don't support it.  If you have ISA, say Y, otherwise N.

config EISA
        bool "EISA support"
        depends on ISA
        ---help---
          The Extended Industry Standard Architecture (EISA) bus was
          developed as an open alternative to the IBM MicroChannel bus.

          The EISA bus provided some of the features of the IBM MicroChannel
          bus while maintaining backward compatibility with cards made for
          the older ISA bus.  The EISA bus saw limited use between 1988 and
          1995 when it was made obsolete by the PCI bus.

          Say Y here if you are building a kernel for an EISA-based machine.

          Otherwise, say N.

source "drivers/eisa/Kconfig"

config MCA
        bool "MCA support"
        depends on !(X86_VISWS || X86_VOYAGER)
        help
          MicroChannel Architecture is found in some IBM PS/2 machines and
          laptops.  It is a bus system similar to PCI or ISA. See
          <file:Documentation/mca.txt> (and especially the web page given
          there) before attempting to build an MCA bus kernel.

config MCA
        depends on X86_VOYAGER
        default y if X86_VOYAGER

source "drivers/mca/Kconfig"

config SCx200
        tristate "NatSemi SCx200 support"
        depends on !X86_VOYAGER
        help
          This provides basic support for the National Semiconductor SCx200 
          processor.  Right now this is just a driver for the GPIO pins.

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

          This support is also available as a module.  If compiled as a
          module, it will be called scx200.

config HOTPLUG
        bool "Support for hot-pluggable devices"
        ---help---
          Say Y here if you want to plug devices into your computer while
          the system is running, and be able to use them quickly.  In many
          cases, the devices can likewise be unplugged at any time too.

          One well known example of this is PCMCIA- or PC-cards, credit-card
          size devices such as network cards, modems or hard drives which are
          plugged into slots found on all modern laptop computers.  Another
          example, used on modern desktops as well as laptops, is USB.

          Enable HOTPLUG and KMOD, and build a modular kernel.  Get agent
          software (at <http://linux-hotplug.sourceforge.net/>) and install it.
          Then your kernel will automatically call out to a user mode "policy
          agent" (/sbin/hotplug) to load modules and set up software needed
          to use devices as you hotplug them.

source "drivers/pcmcia/Kconfig"

source "drivers/pci/hotplug/Kconfig"

endmenu


menu "Executable file formats"

choice
        prompt "Kernel core (/proc/kcore) format"
        depends on PROC_FS
        default KCORE_ELF

config KCORE_ELF
        bool "ELF"
        ---help---
          If you enabled support for /proc file system then the file
          /proc/kcore will contain the kernel core image. This can be used
          in gdb:

          $ cd /usr/src/linux ; gdb vmlinux /proc/kcore

          You have two choices here: ELF and A.OUT. Selecting ELF will make
          /proc/kcore appear in ELF core format as defined by the Executable
          and Linking Format specification. Selecting A.OUT will choose the
          old "a.out" format which may be necessary for some old versions
          of binutils or on some architectures.

          This is especially useful if you have compiled the kernel with the
          "-g" option to preserve debugging information. It is mainly used
          for examining kernel data structures on the live kernel so if you
          don't understand what this means or are not a kernel hacker, just
          leave it at its default value ELF.

config KCORE_AOUT
        bool "A.OUT"
        help
          Not necessary unless you're using a very out-of-date binutils
          version.  You probably want KCORE_ELF.

endchoice

source "fs/Kconfig.binfmt"

endmenu

source "drivers/base/Kconfig"

source "drivers/mtd/Kconfig"

source "drivers/parport/Kconfig"

source "drivers/pnp/Kconfig"

source "drivers/block/Kconfig"

source "drivers/ide/Kconfig"

source "drivers/scsi/Kconfig"

source "drivers/cdrom/Kconfig"

source "drivers/md/Kconfig"

source "drivers/message/fusion/Kconfig"

source "drivers/ieee1394/Kconfig"

source "drivers/message/i2o/Kconfig"

source "net/Kconfig"

source "net/ax25/Kconfig"

source "net/irda/Kconfig"

source "drivers/isdn/Kconfig"

source "drivers/telephony/Kconfig"

#
# input before char - char/joystick depends on it. As does USB.
#
source "drivers/input/Kconfig"

source "drivers/char/Kconfig"

#source drivers/misc/Config.in
source "drivers/media/Kconfig"

source "fs/Kconfig"

source "drivers/video/Kconfig"

menu "Sound"

config SOUND
        tristate "Sound card support"
        ---help---
          If you have a sound card in your computer, i.e. if it can say more
          than an occasional beep, say Y.  Be sure to have all the information
          about your sound card and its configuration down (I/O port,
          interrupt and DMA channel), because you will be asked for it.

          You want to read the Sound-HOWTO, available from
          <http://www.tldp.org/docs.html#howto>. General information about
          the modular sound system is contained in the files
          <file:Documentation/sound/Introduction>.  The file
          <file:Documentation/sound/README.OSS> contains some slightly
          outdated but still useful information as well.

          If you have a PnP sound card and you want to configure it at boot
          time using the ISA PnP tools (read
          <http://www.roestock.demon.co.uk/isapnptools/>), then you need to
          compile the sound card support as a module ( = code which can be
          inserted in and removed from the running kernel whenever you want)
          and load that module after the PnP configuration is finished.  To do
          this, say M here and read <file:Documentation/modules.txt> as well
          as <file:Documentation/sound/README.modules>; the module will be
          called soundcore.

          I'm told that even without a sound card, you can make your computer
          say more than an occasional beep, by programming the PC speaker.
          Kernel patches and supporting utilities to do that are in the pcsp
          package, available at <ftp://ftp.infradead.org/pub/pcsp/>.

source "sound/Kconfig"

endmenu

source "drivers/usb/Kconfig"

source "net/bluetooth/Kconfig"

source "arch/i386/oprofile/Kconfig"


menu "Kernel hacking"

config DEBUG_KERNEL
        bool "Kernel debugging"
        help
          Say Y here if you are developing drivers or trying to debug and
          identify kernel problems.

config DEBUG_STACKOVERFLOW
        bool "Check for stack overflows"
        depends on DEBUG_KERNEL

config DEBUG_SLAB
        bool "Debug memory allocations"
        depends on DEBUG_KERNEL
        help
          Say Y here to have the kernel do limited verification on memory
          allocation as well as poisoning memory on free to catch use of freed
          memory.

config DEBUG_IOVIRT
        bool "Memory mapped I/O debugging"
        depends on DEBUG_KERNEL
        help
          Say Y here to get warned whenever an attempt is made to do I/O on
          obviously invalid addresses such as those generated when ioremap()
          calls are forgotten.  Memory mapped I/O will go through an extra
          check to catch access to unmapped ISA addresses, an access method
          that can still be used by old drivers that are being ported from
          2.0/2.2.

config MAGIC_SYSRQ
        bool "Magic SysRq key"
        depends on DEBUG_KERNEL
        help
          If you say Y here, you will have some control over the system even
          if the system crashes for example during kernel debugging (e.g., you
          will be able to flush the buffer cache to disk, reboot the system
          immediately or dump some status information). This is accomplished
          by pressing various keys while holding SysRq (Alt+PrintScreen). It
          also works on a serial console (on PC hardware at least), if you
          send a BREAK and then within 5 seconds a command keypress. The
          keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
          unless you really know what this hack does.

config DEBUG_SPINLOCK
        bool "Spinlock debugging"
        depends on DEBUG_KERNEL
        help
          Say Y here and build SMP to catch missing spinlock initialization
          and certain other kinds of spinlock errors commonly made.  This is
          best used in conjunction with the NMI watchdog so that spinlock
          deadlocks are also debuggable.

config DEBUG_HIGHMEM
        bool "Highmem debugging"
        depends on DEBUG_KERNEL && HIGHMEM
        help
          This options enables addition error checking for high memory systems.
          Disable for production systems.

config KALLSYMS
        bool "Load all symbols for debugging/kksymoops"
        help
          Say Y here to let the kernel print out symbolic crash information and
          symbolic stack backtraces. This increases the size of the kernel
          somewhat, as all symbols have to be loaded into the kernel image.

config DEBUG_SPINLOCK_SLEEP
        bool "Sleep-inside-spinlock checking"
        help
          If you say Y here, various routines which may sleep will become very
          noisy if they are called with a spinlock held.        

config FRAME_POINTER
        bool "Compile the kernel with frame pointers"
        help
          If you say Y here the resulting kernel image will be slightly larger
          and slower, but it will give very useful debugging information.
          If you don't debug the kernel, you can say N, but we may not be able
          to solve problems without frame pointers.

config X86_EXTRA_IRQS
        bool
        depends on X86_LOCAL_APIC || X86_VOYAGER
        default y

config X86_FIND_SMP_CONFIG
        bool
        depends on X86_LOCAL_APIC || X86_VOYAGER
        default y

config X86_MPPARSE
        bool
        depends on X86_LOCAL_APIC && !X86_VISWS
        default y

endmenu

source "security/Kconfig"

source "crypto/Kconfig"

source "lib/Kconfig"

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

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

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

config X86_TRAMPOLINE
        bool
        depends on SMP || X86_VISWS
        default y