| # |
| # 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 |
| |
| config GENERIC_IOMAP |
| 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_ELAN |
| bool "AMD Elan" |
| 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)" |
| 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 NUMA |
| 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, ES7000, default)" |
| depends on SMP |
| help |
| This option compiles in the Summit, bigsmp, ES7000, 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_SUMMIT_NUMA |
| 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 |
| |
| if !X86_ELAN |
| |
| 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. |
| - "Efficeon" for the Transmeta Efficeon series. |
| - "Winchip-C6" for original IDT Winchip. |
| - "Winchip-2" for IDT Winchip 2. |
| - "Winchip-2A" for IDT Winchips with 3dNow! capabilities. |
| - "GeodeGX1" for Geode GX1 (Cyrix MediaGX). |
| - "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 Cyrix 5x86, 6x86 and 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 MPENTIUMM |
| bool "Pentium M" |
| help |
| Select this for Intel Pentium M (not Pentium-4 M) |
| notebook chips. |
| |
| config MPENTIUM4 |
| bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/Xeon" |
| help |
| Select this for Intel Pentium 4 chips. This includes the |
| Pentium 4, P4-based Celeron and Xeon, and Pentium-4 M |
| (not Pentium M) 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 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 MEFFICEON |
| bool "Efficeon" |
| help |
| Select this for a Transmeta Efficeon processor. |
| |
| 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. Also enable out of order memory |
| stores for this CPU, which can increase performance of some |
| operations. |
| |
| config MGEODEGX1 |
| bool "GeodeGX1" |
| help |
| Select this for a Geode GX1 (Cyrix MediaGX) chip. |
| |
| 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 |
| Instead of just including optimizations for the selected |
| x86 variant (e.g. PII, Crusoe or Athlon), include some more |
| generic optimizations as well. This will make the kernel |
| perform better on x86 CPUs other than that selected. |
| |
| This is really intended for distributors who need more |
| generic optimizations. |
| |
| endif |
| |
| # |
| # 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 X86_ELAN || M486 || M386 |
| default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODEGX1 |
| default "6" if MK7 || MK8 || MPENTIUMM |
| |
| config RWSEM_GENERIC_SPINLOCK |
| bool |
| depends on M386 |
| default y |
| |
| config RWSEM_XCHGADD_ALGORITHM |
| bool |
| depends on !M386 |
| default y |
| |
| config GENERIC_CALIBRATE_DELAY |
| bool |
| default y |
| |
| config X86_PPRO_FENCE |
| bool |
| depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1 |
| 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 || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1 |
| default y |
| |
| config X86_GOOD_APIC |
| bool |
| depends on MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || MK8 || MEFFICEON |
| default y |
| |
| config X86_INTEL_USERCOPY |
| bool |
| depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON |
| default y |
| |
| config X86_USE_PPRO_CHECKSUM |
| bool |
| depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON |
| default y |
| |
| config X86_USE_3DNOW |
| bool |
| depends on MCYRIXIII || MK7 |
| default y |
| |
| config X86_OOSTORE |
| bool |
| depends on (MWINCHIP3D || MWINCHIP2 || MWINCHIPC6) && MTRR |
| default y |
| |
| config HPET_TIMER |
| bool "HPET Timer Support" |
| help |
| This enables the use of the HPET for the kernel's internal timer. |
| HPET is the next generation timer replacing legacy 8254s. |
| 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 "Provide RTC interrupt" |
| depends on HPET_TIMER && RTC=y |
| |
| 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. |
| |
| config NR_CPUS |
| int "Maximum number of CPUs (2-255)" |
| range 2 255 |
| depends on SMP |
| default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000 |
| default "8" |
| help |
| This allows you to specify the maximum number of CPUs which this |
| kernel will support. The maximum supported value is 255 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 SCHED_SMT |
| bool "SMT (Hyperthreading) scheduler support" |
| depends on SMP |
| default off |
| help |
| SMT scheduler support improves the CPU scheduler's decision making |
| when dealing with Intel Pentium 4 chips with HyperThreading at a |
| cost of slightly increased overhead in some places. If unsure say |
| N here. |
| |
| source "kernel/Kconfig.preempt" |
| |
| config X86_UP_APIC |
| bool "Local APIC support on uniprocessors" |
| depends on !SMP && !(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. |
| |
| config X86_UP_IOAPIC |
| bool "IO-APIC support on uniprocessors" |
| depends on 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 many recent 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. |
| |
| config X86_LOCAL_APIC |
| bool |
| depends on X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) |
| default y |
| |
| config X86_IO_APIC |
| bool |
| depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) |
| default y |
| |
| config X86_VISWS_APIC |
| bool |
| depends on X86_VISWS |
| default y |
| |
| config X86_TSC |
| bool |
| depends on (MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MGEODEGX1) && !X86_NUMAQ |
| default y |
| |
| config X86_MCE |
| bool "Machine Check Exception" |
| depends on !X86_VOYAGER |
| ---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 |
| tristate "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) && !X86_VISWS |
| 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://people.debian.org/~dz/i8k/> |
| |
| Say Y if you intend to run this kernel on a Dell Inspiron 8000. |
| Say N otherwise. |
| |
| config X86_REBOOTFIXUPS |
| bool "Enable X86 board specific fixups for reboot" |
| depends on X86 |
| default n |
| ---help--- |
| This enables chipset and/or board specific fixups to be done |
| in order to get reboot to work correctly. This is only needed on |
| some combinations of hardware and BIOS. The symptom, for which |
| this config is intended, is when reboot ends with a stalled/hung |
| system. |
| |
| Currently, the only fixup is for the Geode GX1/CS5530A/TROM2.1. |
| combination. |
| |
| Say Y if you want to enable the fixup. Currently, it's safe to |
| enable this option even if you don't need it. |
| 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/>. |
| |
| To compile this driver as a module, choose M here: the |
| module will be called microcode. |
| |
| 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. |
| |
| source "drivers/firmware/Kconfig" |
| |
| 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 and Scheduler Support" |
| depends on SMP && HIGHMEM64G && (X86_NUMAQ || X86_GENERICARCH || (X86_SUMMIT && ACPI)) |
| 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, ACPI" |
| depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI) |
| |
| config HAVE_ARCH_BOOTMEM_NODE |
| bool |
| depends on NUMA |
| default y |
| |
| config ARCH_HAVE_MEMORY_PRESENT |
| bool |
| depends on DISCONTIGMEM |
| default y |
| |
| config NEED_NODE_MEMMAP_SIZE |
| bool |
| depends on DISCONTIGMEM || SPARSEMEM |
| default y |
| |
| config HAVE_ARCH_ALLOC_REMAP |
| bool |
| depends on NUMA |
| default y |
| |
| config ARCH_DISCONTIGMEM_ENABLE |
| def_bool y |
| depends on NUMA |
| |
| config ARCH_DISCONTIGMEM_DEFAULT |
| def_bool y |
| depends on NUMA |
| |
| config ARCH_SPARSEMEM_ENABLE |
| def_bool y |
| depends on NUMA |
| |
| config ARCH_SELECT_MEMORY_MODEL |
| def_bool y |
| depends on ARCH_SPARSEMEM_ENABLE |
| |
| source "mm/Kconfig" |
| |
| config HAVE_ARCH_EARLY_PFN_TO_NID |
| bool |
| default y |
| depends on NUMA |
| |
| 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 EFI |
| bool "Boot from EFI support (EXPERIMENTAL)" |
| depends on ACPI |
| default n |
| ---help--- |
| This enables the the kernel to boot on EFI platforms using |
| system configuration information passed to it from the firmware. |
| This also enables the kernel to use any EFI runtime services that are |
| available (such as the EFI variable services). |
| |
| This option is only useful on systems that have EFI firmware |
| and will result in a kernel image that is ~8k larger. In addition, |
| you must use the latest ELILO loader available at |
| <http://elilo.sourceforge.net> in order to take advantage of |
| kernel initialization using EFI information (neither GRUB nor LILO know |
| anything about EFI). However, even with this option, the resultant |
| kernel should continue to boot on existing non-EFI platforms. |
| |
| config IRQBALANCE |
| bool "Enable kernel irq balancing" |
| depends on SMP && X86_IO_APIC |
| default y |
| help |
| The default yes will allow the kernel to do irq load balancing. |
| Saying no will keep the kernel from doing irq load balancing. |
| |
| 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) || (X86 && EFI)) |
| default y |
| |
| config REGPARM |
| bool "Use register arguments (EXPERIMENTAL)" |
| depends on EXPERIMENTAL |
| default n |
| help |
| Compile the kernel with -mregparm=3. This uses a different ABI |
| and passes the first three arguments of a function call in registers. |
| This will probably break binary only modules. |
| |
| This feature is only enabled for gcc-3.0 and later - earlier compilers |
| generate incorrect output with certain kernel constructs when |
| -mregparm=3 is used. |
| |
| config SECCOMP |
| bool "Enable seccomp to safely compute untrusted bytecode" |
| depends on PROC_FS |
| default y |
| help |
| This kernel feature is useful for number crunching applications |
| that may need to compute untrusted bytecode during their |
| execution. By using pipes or other transports made available to |
| the process as file descriptors supporting the read/write |
| syscalls, it's possible to isolate those applications in |
| their own address space using seccomp. Once seccomp is |
| enabled via /proc/<pid>/seccomp, it cannot be disabled |
| and the task is only allowed to execute a few safe syscalls |
| defined by each seccomp mode. |
| |
| If unsure, say Y. Only embedded should say N here. |
| |
| source kernel/Kconfig.hz |
| |
| endmenu |
| |
| |
| menu "Power management options (ACPI, APM)" |
| depends on !X86_VOYAGER |
| |
| source kernel/power/Kconfig |
| |
| source "drivers/acpi/Kconfig" |
| |
| menu "APM (Advanced Power Management) BIOS Support" |
| depends on PM && !X86_VISWS |
| |
| config APM |
| tristate "APM (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, choose M here: 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. |
| |
| endmenu |
| |
| source "arch/i386/kernel/cpu/cpufreq/Kconfig" |
| |
| endmenu |
| |
| menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)" |
| |
| 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 |
| ---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 "MMConfig", then PCI Express MMCONFIG will be used. |
| If you choose "Any", the kernel will try MMCONFIG, then 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_GOBIOS |
| bool "BIOS" |
| |
| config PCI_GOMMCONFIG |
| bool "MMConfig" |
| |
| 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 |
| |
| config PCI_MMCONFIG |
| bool |
| depends on PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY) |
| select ACPI_BOOT |
| default y |
| |
| source "drivers/pci/pcie/Kconfig" |
| |
| source "drivers/pci/Kconfig" |
| |
| config ISA_DMA_API |
| bool |
| default y |
| |
| 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" if !(X86_VISWS || X86_VOYAGER) |
| default y if 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. |
| |
| 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_CPU |
| bool "Support for hot-pluggable CPUs (EXPERIMENTAL)" |
| depends on SMP && HOTPLUG && EXPERIMENTAL |
| ---help--- |
| Say Y here to experiment with turning CPUs off and on. CPUs |
| can be controlled through /sys/devices/system/cpu. |
| |
| Say N. |
| |
| source "drivers/pcmcia/Kconfig" |
| |
| source "drivers/pci/hotplug/Kconfig" |
| |
| endmenu |
| |
| menu "Executable file formats" |
| |
| source "fs/Kconfig.binfmt" |
| |
| endmenu |
| |
| source "drivers/Kconfig" |
| |
| source "fs/Kconfig" |
| |
| source "arch/i386/oprofile/Kconfig" |
| |
| source "arch/i386/Kconfig.debug" |
| |
| source "security/Kconfig" |
| |
| source "crypto/Kconfig" |
| |
| source "lib/Kconfig" |
| |
| # |
| # Use the generic interrupt handling code in kernel/irq/: |
| # |
| config GENERIC_HARDIRQS |
| bool |
| default y |
| |
| config GENERIC_IRQ_PROBE |
| bool |
| default y |
| |
| 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 X86_SMP || (X86_VOYAGER && SMP) |
| default y |
| |
| config PC |
| bool |
| depends on X86 && !EMBEDDED |
| default y |