config KTIME_SCALAR
def_bool X86_32
+source "init/Kconfig"
+menu "Processor type and features"
+
+source "kernel/time/Kconfig"
+
+config SMP
+ bool "Symmetric multi-processing support"
+ ---help---
+ This enables support for systems with more than one CPU. If you have
+ a system with only one CPU, like most personal computers, say N. If
+ you have a system with more than one CPU, say Y.
+
+ If you say N here, the kernel will run on single and multiprocessor
+ machines, but will use only one CPU of a multiprocessor machine. If
+ you say Y here, the kernel will run on many, but not all,
+ singleprocessor machines. On a singleprocessor machine, the kernel
+ will run faster if you say N here.
+
+ Note that if you say Y here and choose architecture "586" or
+ "Pentium" under "Processor family", the kernel will not work on 486
+ architectures. Similarly, multiprocessor kernels for the "PPro"
+ architecture may not work on all Pentium based boards.
+
+ People using multiprocessor machines who say Y here should also say
+ Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
+ Management" code will be disabled if you say Y here.
+
+ See also the <file:Documentation/smp.txt>,
+ <file:Documentation/i386/IO-APIC.txt>,
+ <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
+ <http://www.tldp.org/docs.html#howto>.
+
+ If you don't know what to do here, say N.
+
+choice
+ prompt "Subarchitecture Type"
+ default X86_PC
+
+config X86_PC
+ bool "PC-compatible"
+ help
+ Choose this option if your computer is a standard PC or compatible.
+
+config X86_ELAN
+ bool "AMD Elan"
+ depends on X86_32
+ help
+ Select this for an AMD Elan processor.
+
+ Do not use this option for K6/Athlon/Opteron processors!
+
+ If unsure, choose "PC-compatible" instead.
+
+config X86_VOYAGER
+ bool "Voyager (NCR)"
+ depends on X86_32
+ select SMP if !BROKEN
+ help
+ Voyager is an MCA-based 32-way capable SMP architecture proprietary
+ to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
+
+ *** WARNING ***
+
+ If you do not specifically know you have a Voyager based machine,
+ say N here, otherwise the kernel you build will not be bootable.
+
+config X86_NUMAQ
+ bool "NUMAQ (IBM/Sequent)"
+ select SMP
+ select NUMA
+ depends on X86_32
+ help
+ This option is used for getting Linux to run on a (IBM/Sequent) NUMA
+ multiquad box. This changes the way that processors are bootstrapped,
+ and uses Clustered Logical APIC addressing mode instead of Flat Logical.
+ You will need a new lynxer.elf file to flash your firmware with - send
+ email to <Martin.Bligh@us.ibm.com>.
+
+config X86_SUMMIT
+ bool "Summit/EXA (IBM x440)"
+ depends on X86_32 && SMP
+ help
+ This option is needed for IBM systems that use the Summit/EXA chipset.
+ In particular, it is needed for the x440.
+
+ If you don't have one of these computers, you should say N here.
+ If you want to build a NUMA kernel, you must select ACPI.
+
+config X86_BIGSMP
+ bool "Support for other sub-arch SMP systems with more than 8 CPUs"
+ depends on X86_32 && SMP
+ help
+ This option is needed for the systems that have more than 8 CPUs
+ and if the system is not of any sub-arch type above.
+
+ If you don't have such a system, you should say N here.
+
+config X86_VISWS
+ bool "SGI 320/540 (Visual Workstation)"
+ depends on X86_32
+ help
+ The SGI Visual Workstation series is an IA32-based workstation
+ based on SGI systems chips with some legacy PC hardware attached.
+
+ Say Y here to create a kernel to run on the SGI 320 or 540.
+
+ A kernel compiled for the Visual Workstation will not run on PCs
+ and vice versa. See <file:Documentation/sgi-visws.txt> for details.
+
+config X86_GENERICARCH
+ bool "Generic architecture (Summit, bigsmp, ES7000, default)"
+ depends on X86_32
+ help
+ This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
+ It is intended for a generic binary kernel.
+ If you want a NUMA kernel, select ACPI. We need SRAT for NUMA.
+
+config X86_ES7000
+ bool "Support for Unisys ES7000 IA32 series"
+ depends on X86_32 && SMP
+ help
+ Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
+ supposed to run on an IA32-based Unisys ES7000 system.
+ Only choose this option if you have such a system, otherwise you
+ should say N here.
+
+config X86_VSMP
+ bool "Support for ScaleMP vSMP"
+ depends on X86_64 && PCI
+ help
+ Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
+ supposed to run on these EM64T-based machines. Only choose this option
+ if you have one of these machines.
+
+endchoice
+
+config SCHED_NO_NO_OMIT_FRAME_POINTER
+ bool "Single-depth WCHAN output"
+ default y
+ depends on X86_32
+ help
+ Calculate simpler /proc/<PID>/wchan values. If this option
+ is disabled then wchan values will recurse back to the
+ caller function. This provides more accurate wchan values,
+ at the expense of slightly more scheduling overhead.
+
+ If in doubt, say "Y".
+
+config PARAVIRT
+ bool
+ depends on X86_32 && !(X86_VISWS || X86_VOYAGER)
+ help
+ This changes the kernel so it can modify itself when it is run
+ under a hypervisor, potentially improving performance significantly
+ over full virtualization. However, when run without a hypervisor
+ the kernel is theoretically slower and slightly larger.
+
+menuconfig PARAVIRT_GUEST
+ bool "Paravirtualized guest support"
+ depends on X86_32
+ help
+ Say Y here to get to see options related to running Linux under
+ various hypervisors. This option alone does not add any kernel code.
+
+ If you say N, all options in this submenu will be skipped and disabled.
+
+if PARAVIRT_GUEST
+
+source "arch/x86/xen/Kconfig"
+
+config VMI
+ bool "VMI Guest support"
+ select PARAVIRT
+ depends on !(X86_VISWS || X86_VOYAGER)
+ help
+ VMI provides a paravirtualized interface to the VMware ESX server
+ (it could be used by other hypervisors in theory too, but is not
+ at the moment), by linking the kernel to a GPL-ed ROM module
+ provided by the hypervisor.
+
+source "arch/x86/lguest/Kconfig"
+
+endif
+
+config ACPI_SRAT
+ bool
+ default y
+ depends on X86_32 && ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH)
+ select ACPI_NUMA
+
+config HAVE_ARCH_PARSE_SRAT
+ bool
+ default y
+ depends on ACPI_SRAT
+
+config X86_SUMMIT_NUMA
+ bool
+ default y
+ depends on X86_32 && NUMA && (X86_SUMMIT || X86_GENERICARCH)
+
+config X86_CYCLONE_TIMER
+ bool
+ default y
+ depends on X86_32 && X86_SUMMIT || X86_GENERICARCH
+
+config ES7000_CLUSTERED_APIC
+ bool
+ default y
+ depends on SMP && X86_ES7000 && MPENTIUMIII
+
+source "arch/x86/Kconfig.cpu"
+
+config HPET_TIMER
+ bool
+ prompt "HPET Timer Support" if X86_32
+ default X86_64
+ help
+ Use the IA-PC HPET (High Precision Event Timer) to manage
+ time in preference to the PIT and RTC, if a HPET is
+ present.
+ HPET is the next generation timer replacing legacy 8254s.
+ The HPET provides a stable time base on SMP
+ systems, unlike the TSC, but it is more expensive to access,
+ as it is off-chip. You can find the HPET spec at
+ <http://www.intel.com/hardwaredesign/hpetspec.htm>.
+
+ You can safely choose Y here. However, HPET will only be
+ activated if the platform and the BIOS support this feature.
+ Otherwise the 8254 will be used for timing services.
+
+ Choose N to continue using the legacy 8254 timer.
+
+config HPET_EMULATE_RTC
+ bool
+ depends on HPET_TIMER && RTC=y
+ default y
+
+# Mark as embedded because too many people got it wrong.
+# The code disables itself when not needed.
+config GART_IOMMU
+ bool "GART IOMMU support" if EMBEDDED
+ default y
+ select SWIOTLB
+ select AGP
+ depends on X86_64 && PCI
+ help
+ Support for full DMA access of devices with 32bit memory access only
+ on systems with more than 3GB. This is usually needed for USB,
+ sound, many IDE/SATA chipsets and some other devices.
+ Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
+ based hardware IOMMU and a software bounce buffer based IOMMU used
+ on Intel systems and as fallback.
+ The code is only active when needed (enough memory and limited
+ device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
+ too.
+
+config CALGARY_IOMMU
+ bool "IBM Calgary IOMMU support"
+ select SWIOTLB
+ depends on X86_64 && PCI && EXPERIMENTAL
+ help
+ Support for hardware IOMMUs in IBM's xSeries x366 and x460
+ systems. Needed to run systems with more than 3GB of memory
+ properly with 32-bit PCI devices that do not support DAC
+ (Double Address Cycle). Calgary also supports bus level
+ isolation, where all DMAs pass through the IOMMU. This
+ prevents them from going anywhere except their intended
+ destination. This catches hard-to-find kernel bugs and
+ mis-behaving drivers and devices that do not use the DMA-API
+ properly to set up their DMA buffers. The IOMMU can be
+ turned off at boot time with the iommu=off parameter.
+ Normally the kernel will make the right choice by itself.
+ If unsure, say Y.
+
+config CALGARY_IOMMU_ENABLED_BY_DEFAULT
+ bool "Should Calgary be enabled by default?"
+ default y
+ depends on CALGARY_IOMMU
+ help
+ Should Calgary be enabled by default? if you choose 'y', Calgary
+ will be used (if it exists). If you choose 'n', Calgary will not be
+ used even if it exists. If you choose 'n' and would like to use
+ Calgary anyway, pass 'iommu=calgary' on the kernel command line.
+ If unsure, say Y.
+
+# need this always selected by IOMMU for the VIA workaround
+config SWIOTLB
+ bool
+ help
+ Support for software bounce buffers used on x86-64 systems
+ which don't have a hardware IOMMU (e.g. the current generation
+ of Intel's x86-64 CPUs). Using this PCI devices which can only
+ access 32-bits of memory can be used on systems with more than
+ 3 GB of memory. If unsure, say Y.
+
+
+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 (X86_64 && SMP) || (X86_32 && X86_HT)
+ 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.
+
+config SCHED_MC
+ bool "Multi-core scheduler support"
+ depends on (X86_64 && SMP) || (X86_32 && X86_HT)
+ default y
+ help
+ Multi-core scheduler support improves the CPU scheduler's decision
+ making when dealing with multi-core CPU chips 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 X86_32 && !SMP && !(X86_VISWS || X86_VOYAGER || X86_GENERICARCH)
+ 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_64 || (X86_32 && (X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || X86_GENERICARCH))
+ default y
+
+config X86_IO_APIC
+ bool
+ depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH))
+ default y
+
+config X86_VISWS_APIC
+ bool
+ depends on X86_32 && X86_VISWS
+ 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_INTEL
+ bool "Intel MCE features"
+ depends on X86_64 && X86_MCE && X86_LOCAL_APIC
+ default y
+ help
+ Additional support for intel specific MCE features such as
+ the thermal monitor.
+
+config X86_MCE_AMD
+ bool "AMD MCE features"
+ depends on X86_64 && X86_MCE && X86_LOCAL_APIC
+ default y
+ help
+ Additional support for AMD specific MCE features such as
+ the DRAM Error Threshold.
+
+config X86_MCE_NONFATAL
+ tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
+ depends on X86_32 && 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
+ 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_32 && 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 VM86
+ bool "Enable VM86 support" if EMBEDDED
+ default y
+ depends on X86_32
+ help
+ This option is required by programs like DOSEMU to run 16-bit legacy
+ code on X86 processors. It also may be needed by software like
+ XFree86 to initialize some video cards via BIOS. Disabling this
+ option saves about 6k.
+
+config TOSHIBA
+ tristate "Toshiba Laptop support"
+ depends on X86_32
+ ---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"
+ depends on X86_32
+ ---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_32 && 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 machines using
+ CS5530A and CS5536 chipsets.
+
+ 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"
+ select FW_LOADER
+ ---help---
+ If you say Y here, 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 MICROCODE_OLD_INTERFACE
+ bool
+ depends on MICROCODE
+ default y
+
+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.
+
+choice
+ prompt "High Memory Support"
+ default HIGHMEM4G if !X86_NUMAQ
+ default HIGHMEM64G if X86_NUMAQ
+ depends on X86_32
+
+config NOHIGHMEM
+ bool "off"
+ depends on !X86_NUMAQ
+ ---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"
+ depends on !X86_NUMAQ
+ help
+ Select this if you have a 32-bit processor and between 1 and 4
+ gigabytes of physical RAM.
+
+config HIGHMEM64G
+ bool "64GB"
+ depends on !M386 && !M486
+ select X86_PAE
+ help
+ Select this if you have a 32-bit processor and more than 4
+ gigabytes of physical RAM.
+
+endchoice
+
+choice
+ depends on EXPERIMENTAL
+ prompt "Memory split" if EMBEDDED
+ default VMSPLIT_3G
+ depends on X86_32
+ help
+ Select the desired split between kernel and user memory.
+
+ If the address range available to the kernel is less than the
+ physical memory installed, the remaining memory will be available
+ as "high memory". Accessing high memory is a little more costly
+ than low memory, as it needs to be mapped into the kernel first.
+ Note that increasing the kernel address space limits the range
+ available to user programs, making the address space there
+ tighter. Selecting anything other than the default 3G/1G split
+ will also likely make your kernel incompatible with binary-only
+ kernel modules.
+
+ If you are not absolutely sure what you are doing, leave this
+ option alone!
+
+ config VMSPLIT_3G
+ bool "3G/1G user/kernel split"
+ config VMSPLIT_3G_OPT
+ depends on !X86_PAE
+ bool "3G/1G user/kernel split (for full 1G low memory)"
+ config VMSPLIT_2G
+ bool "2G/2G user/kernel split"
+ config VMSPLIT_2G_OPT
+ depends on !X86_PAE
+ bool "2G/2G user/kernel split (for full 2G low memory)"
+ config VMSPLIT_1G
+ bool "1G/3G user/kernel split"
+endchoice
+
+config PAGE_OFFSET
+ hex
+ default 0xB0000000 if VMSPLIT_3G_OPT
+ default 0x80000000 if VMSPLIT_2G
+ default 0x78000000 if VMSPLIT_2G_OPT
+ default 0x40000000 if VMSPLIT_1G
+ default 0xC0000000
+ depends on X86_32
+
+config HIGHMEM
+ bool
+ depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
+ default y
+
+config X86_PAE
+ bool "PAE (Physical Address Extension) Support"
+ default n
+ depends on X86_32 && !HIGHMEM4G
+ select RESOURCES_64BIT
+ help
+ PAE is required for NX support, and furthermore enables
+ larger swapspace support for non-overcommit purposes. It
+ has the cost of more pagetable lookup overhead, and also
+ consumes more pagetable space per process.
+
+# Common NUMA Features
+config NUMA
+ bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
+ depends on SMP
+ depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL)
+ default n if X86_PC
+ default y if (X86_NUMAQ || X86_SUMMIT)
+ help
+ Enable NUMA (Non Uniform Memory Access) support.
+ The kernel will try to allocate memory used by a CPU on the
+ local memory controller of the CPU and add some more
+ NUMA awareness to the kernel.
+
+ For i386 this is currently highly experimental and should be only
+ used for kernel development. It might also cause boot failures.
+ For x86_64 this is recommended on all multiprocessor Opteron systems.
+ If the system is EM64T, you should say N unless your system is
+ EM64T NUMA.
+
+comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
+ depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
+
+config K8_NUMA
+ bool "Old style AMD Opteron NUMA detection"
+ depends on X86_64 && NUMA && PCI
+ default y
+ help
+ Enable K8 NUMA node topology detection. You should say Y here if
+ you have a multi processor AMD K8 system. This uses an old
+ method to read the NUMA configuration directly from the builtin
+ Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
+ instead, which also takes priority if both are compiled in.
+
+config X86_64_ACPI_NUMA
+ bool "ACPI NUMA detection"
+ depends on X86_64 && NUMA && ACPI && PCI
+ select ACPI_NUMA
+ default y
+ help
+ Enable ACPI SRAT based node topology detection.
+
+config NUMA_EMU
+ bool "NUMA emulation"
+ depends on X86_64 && NUMA
+ help
+ Enable NUMA emulation. A flat machine will be split
+ into virtual nodes when booted with "numa=fake=N", where N is the
+ number of nodes. This is only useful for debugging.
+
+config NODES_SHIFT
+ int
+ default "6" if X86_64
+ default "4" if X86_NUMAQ
+ default "3"
+ depends on NEED_MULTIPLE_NODES
+
+config HAVE_ARCH_BOOTMEM_NODE
+ bool
+ depends on X86_32 && NUMA
+ default y
+
+config ARCH_HAVE_MEMORY_PRESENT
+ bool
+ depends on X86_32 && DISCONTIGMEM
+ default y
+
+config NEED_NODE_MEMMAP_SIZE
+ bool
+ depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
+ default y
+
+config HAVE_ARCH_ALLOC_REMAP
+ bool
+ depends on X86_32 && NUMA
+ default y
+
+config ARCH_FLATMEM_ENABLE
+ def_bool y
+ depends on (X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC) || (X86_64 && !NUMA)
+
+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 || (EXPERIMENTAL && (X86_PC || X86_64))
+ select SPARSEMEM_STATIC if X86_32
+ select SPARSEMEM_VMEMMAP_ENABLE if X86_64
+
+config ARCH_SELECT_MEMORY_MODEL
+ def_bool y
+ depends on X86_32 && ARCH_SPARSEMEM_ENABLE
+
+config ARCH_MEMORY_PROBE
+ def_bool X86_64
+ depends on MEMORY_HOTPLUG
+
+source "mm/Kconfig"
+
+config HIGHPTE
+ bool "Allocate 3rd-level pagetables from highmem"
+ depends on X86_32 && (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
+ prompt "Math emulation" if X86_32
+ ---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/x86/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"
+ depends on X86_32 && ACPI
+ default n
+ ---help---
+ This enables 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 X86_32 && 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.
+
+# turning this on wastes a bunch of space.
+# Summit needs it only when NUMA is on
+config BOOT_IOREMAP
+ bool
+ depends on X86_32 && (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
+ default y
+
+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.
+
+config CC_STACKPROTECTOR
+ bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
+ depends on X86_64 && EXPERIMENTAL
+ help
+ This option turns on the -fstack-protector GCC feature. This
+ feature puts, at the beginning of critical functions, a canary
+ value on the stack just before the return address, and validates
+ the value just before actually returning. Stack based buffer
+ overflows (that need to overwrite this return address) now also
+ overwrite the canary, which gets detected and the attack is then
+ neutralized via a kernel panic.
+
+ This feature requires gcc version 4.2 or above, or a distribution
+ gcc with the feature backported. Older versions are automatically
+ detected and for those versions, this configuration option is ignored.
+
+config CC_STACKPROTECTOR_ALL
+ bool "Use stack-protector for all functions"
+ depends on CC_STACKPROTECTOR
+ help
+ Normally, GCC only inserts the canary value protection for
+ functions that use large-ish on-stack buffers. By enabling
+ this option, GCC will be asked to do this for ALL functions.
+
+source kernel/Kconfig.hz
+
+config KEXEC
+ bool "kexec system call"
+ help
+ kexec is a system call that implements the ability to shutdown your
+ current kernel, and to start another kernel. It is like a reboot
+ but it is independent of the system firmware. And like a reboot
+ you can start any kernel with it, not just Linux.
+
+ The name comes from the similarity to the exec system call.
+
+ It is an ongoing process to be certain the hardware in a machine
+ is properly shutdown, so do not be surprised if this code does not
+ initially work for you. It may help to enable device hotplugging
+ support. As of this writing the exact hardware interface is
+ strongly in flux, so no good recommendation can be made.
+
+config CRASH_DUMP
+ bool "kernel crash dumps (EXPERIMENTAL)"
+ depends on EXPERIMENTAL
+ depends on X86_64 || (X86_32 && HIGHMEM)
+ help
+ Generate crash dump after being started by kexec.
+ This should be normally only set in special crash dump kernels
+ which are loaded in the main kernel with kexec-tools into
+ a specially reserved region and then later executed after
+ a crash by kdump/kexec. The crash dump kernel must be compiled
+ to a memory address not used by the main kernel or BIOS using
+ PHYSICAL_START, or it must be built as a relocatable image
+ (CONFIG_RELOCATABLE=y).
+ For more details see Documentation/kdump/kdump.txt
+
+config PHYSICAL_START
+ hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
+ default "0x1000000" if X86_NUMAQ
+ default "0x200000" if X86_64
+ default "0x100000"
+ help
+ This gives the physical address where the kernel is loaded.
+
+ If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
+ bzImage will decompress itself to above physical address and
+ run from there. Otherwise, bzImage will run from the address where
+ it has been loaded by the boot loader and will ignore above physical
+ address.
+
+ In normal kdump cases one does not have to set/change this option
+ as now bzImage can be compiled as a completely relocatable image
+ (CONFIG_RELOCATABLE=y) and be used to load and run from a different
+ address. This option is mainly useful for the folks who don't want
+ to use a bzImage for capturing the crash dump and want to use a
+ vmlinux instead. vmlinux is not relocatable hence a kernel needs
+ to be specifically compiled to run from a specific memory area
+ (normally a reserved region) and this option comes handy.
+
+ So if you are using bzImage for capturing the crash dump, leave
+ the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
+ Otherwise if you plan to use vmlinux for capturing the crash dump
+ change this value to start of the reserved region (Typically 16MB
+ 0x1000000). In other words, it can be set based on the "X" value as
+ specified in the "crashkernel=YM@XM" command line boot parameter
+ passed to the panic-ed kernel. Typically this parameter is set as
+ crashkernel=64M@16M. Please take a look at
+ Documentation/kdump/kdump.txt for more details about crash dumps.
+
+ Usage of bzImage for capturing the crash dump is recommended as
+ one does not have to build two kernels. Same kernel can be used
+ as production kernel and capture kernel. Above option should have
+ gone away after relocatable bzImage support is introduced. But it
+ is present because there are users out there who continue to use
+ vmlinux for dump capture. This option should go away down the
+ line.
+
+ Don't change this unless you know what you are doing.
+
+config RELOCATABLE
+ bool "Build a relocatable kernel (EXPERIMENTAL)"
+ depends on EXPERIMENTAL
+ help
+ This builds a kernel image that retains relocation information
+ so it can be loaded someplace besides the default 1MB.
+ The relocations tend to make the kernel binary about 10% larger,
+ but are discarded at runtime.
+
+ One use is for the kexec on panic case where the recovery kernel
+ must live at a different physical address than the primary
+ kernel.
+
+ Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
+ it has been loaded at and the compile time physical address
+ (CONFIG_PHYSICAL_START) is ignored.
+
+config PHYSICAL_ALIGN
+ hex
+ prompt "Alignment value to which kernel should be aligned" if X86_32
+ default "0x100000" if X86_32
+ default "0x200000" if X86_64
+ range 0x2000 0x400000
+ help
+ This value puts the alignment restrictions on physical address
+ where kernel is loaded and run from. Kernel is compiled for an
+ address which meets above alignment restriction.
+
+ If bootloader loads the kernel at a non-aligned address and
+ CONFIG_RELOCATABLE is set, kernel will move itself to nearest
+ address aligned to above value and run from there.
+
+ If bootloader loads the kernel at a non-aligned address and
+ CONFIG_RELOCATABLE is not set, kernel will ignore the run time
+ load address and decompress itself to the address it has been
+ compiled for and run from there. The address for which kernel is
+ compiled already meets above alignment restrictions. Hence the
+ end result is that kernel runs from a physical address meeting
+ above alignment restrictions.
+
+ Don't change this unless you know what you are doing.
+
+config HOTPLUG_CPU
+ bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
+ depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
+ ---help---
+ Say Y here to experiment with turning CPUs off and on, and to
+ enable suspend on SMP systems. CPUs can be controlled through
+ /sys/devices/system/cpu.
+ Say N if you want to disable CPU hotplug and don't need to
+ suspend.
+
+config COMPAT_VDSO
+ bool "Compat VDSO support"
+ default y
+ depends on X86_32
+ help
+ Map the VDSO to the predictable old-style address too.
+ ---help---
+ Say N here if you are running a sufficiently recent glibc
+ version (2.3.3 or later), to remove the high-mapped
+ VDSO mapping and to exclusively use the randomized VDSO.
+
+ If unsure, say Y.
+
+endmenu
+
+config ARCH_ENABLE_MEMORY_HOTPLUG
+ def_bool y
+ depends on X86_64 || (X86_32 && HIGHMEM)
+
+config MEMORY_HOTPLUG_RESERVE
+ def_bool X86_64
+ depends on (MEMORY_HOTPLUG && DISCONTIGMEM)
+
+config HAVE_ARCH_EARLY_PFN_TO_NID
+ def_bool X86_64
+ depends on NUMA
+
+config OUT_OF_LINE_PFN_TO_PAGE
+ def_bool X86_64
+ depends on DISCONTIGMEM
menu "Power management options"
depends on !X86_VOYAGER
486, 586, Pentiums, and various instruction-set-compatible chips by
AMD, Cyrix, and others.
-source "init/Kconfig"
-
-menu "Processor type and features"
-
-source "kernel/time/Kconfig"
-
-config SMP
- bool "Symmetric multi-processing support"
- ---help---
- This enables support for systems with more than one CPU. If you have
- a system with only one CPU, like most personal computers, say N. If
- you have a system with more than one CPU, say Y.
-
- If you say N here, the kernel will run on single and multiprocessor
- machines, but will use only one CPU of a multiprocessor machine. If
- you say Y here, the kernel will run on many, but not all,
- singleprocessor machines. On a singleprocessor machine, the kernel
- will run faster if you say N here.
-
- Note that if you say Y here and choose architecture "586" or
- "Pentium" under "Processor family", the kernel will not work on 486
- architectures. Similarly, multiprocessor kernels for the "PPro"
- architecture may not work on all Pentium based boards.
-
- People using multiprocessor machines who say Y here should also say
- Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
- Management" code will be disabled if you say Y here.
-
- See also the <file:Documentation/smp.txt>,
- <file:Documentation/i386/IO-APIC.txt>,
- <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
- <http://www.tldp.org/docs.html#howto>.
-
- If you don't know what to do here, say N.
-
-choice
- prompt "Subarchitecture Type"
- default X86_PC
-
-config X86_PC
- bool "PC-compatible"
- help
- Choose this option if your computer is a standard PC or compatible.
-
-config X86_ELAN
- bool "AMD Elan"
- depends on X86_32
- help
- Select this for an AMD Elan processor.
-
- Do not use this option for K6/Athlon/Opteron processors!
-
- If unsure, choose "PC-compatible" instead.
-
-config X86_VOYAGER
- bool "Voyager (NCR)"
- depends on X86_32
- select SMP if !BROKEN
- help
- Voyager is an MCA-based 32-way capable SMP architecture proprietary
- to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
-
- *** WARNING ***
-
- If you do not specifically know you have a Voyager based machine,
- say N here, otherwise the kernel you build will not be bootable.
-
-config X86_NUMAQ
- bool "NUMAQ (IBM/Sequent)"
- select SMP
- select NUMA
- depends on X86_32
- help
- This option is used for getting Linux to run on a (IBM/Sequent) NUMA
- multiquad box. This changes the way that processors are bootstrapped,
- and uses Clustered Logical APIC addressing mode instead of Flat Logical.
- You will need a new lynxer.elf file to flash your firmware with - send
- email to <Martin.Bligh@us.ibm.com>.
-
-config X86_SUMMIT
- bool "Summit/EXA (IBM x440)"
- depends on X86_32 && SMP
- help
- This option is needed for IBM systems that use the Summit/EXA chipset.
- In particular, it is needed for the x440.
-
- If you don't have one of these computers, you should say N here.
- If you want to build a NUMA kernel, you must select ACPI.
-
-config X86_BIGSMP
- bool "Support for other sub-arch SMP systems with more than 8 CPUs"
- depends on X86_32 && SMP
- help
- This option is needed for the systems that have more than 8 CPUs
- and if the system is not of any sub-arch type above.
-
- If you don't have such a system, you should say N here.
-
-config X86_VISWS
- bool "SGI 320/540 (Visual Workstation)"
- depends on X86_32
- help
- The SGI Visual Workstation series is an IA32-based workstation
- based on SGI systems chips with some legacy PC hardware attached.
-
- Say Y here to create a kernel to run on the SGI 320 or 540.
-
- A kernel compiled for the Visual Workstation will not run on PCs
- and vice versa. See <file:Documentation/sgi-visws.txt> for details.
-
-config X86_GENERICARCH
- bool "Generic architecture (Summit, bigsmp, ES7000, default)"
- depends on X86_32
- help
- This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
- It is intended for a generic binary kernel.
- If you want a NUMA kernel, select ACPI. We need SRAT for NUMA.
-
-config X86_ES7000
- bool "Support for Unisys ES7000 IA32 series"
- depends on X86_32 && SMP
- help
- Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
- supposed to run on an IA32-based Unisys ES7000 system.
- Only choose this option if you have such a system, otherwise you
- should say N here.
-
-config X86_VSMP
- bool "Support for ScaleMP vSMP"
- depends on X86_64 && PCI
- help
- Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
- supposed to run on these EM64T-based machines. Only choose this option
- if you have one of these machines.
-
-endchoice
-
-config SCHED_NO_NO_OMIT_FRAME_POINTER
- bool "Single-depth WCHAN output"
- default y
- depends on X86_32
- help
- Calculate simpler /proc/<PID>/wchan values. If this option
- is disabled then wchan values will recurse back to the
- caller function. This provides more accurate wchan values,
- at the expense of slightly more scheduling overhead.
-
- If in doubt, say "Y".
-
-config PARAVIRT
- bool
- depends on X86_32 && !(X86_VISWS || X86_VOYAGER)
- help
- This changes the kernel so it can modify itself when it is run
- under a hypervisor, potentially improving performance significantly
- over full virtualization. However, when run without a hypervisor
- the kernel is theoretically slower and slightly larger.
-
-menuconfig PARAVIRT_GUEST
- bool "Paravirtualized guest support"
- depends on X86_32
- help
- Say Y here to get to see options related to running Linux under
- various hypervisors. This option alone does not add any kernel code.
-
- If you say N, all options in this submenu will be skipped and disabled.
-
-if PARAVIRT_GUEST
-
-source "arch/x86/xen/Kconfig"
-
-config VMI
- bool "VMI Guest support"
- select PARAVIRT
- depends on !(X86_VISWS || X86_VOYAGER)
- help
- VMI provides a paravirtualized interface to the VMware ESX server
- (it could be used by other hypervisors in theory too, but is not
- at the moment), by linking the kernel to a GPL-ed ROM module
- provided by the hypervisor.
-
-source "arch/x86/lguest/Kconfig"
-
-endif
-
-config ACPI_SRAT
- bool
- default y
- depends on X86_32 && ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH)
- select ACPI_NUMA
-
-config HAVE_ARCH_PARSE_SRAT
- bool
- default y
- depends on ACPI_SRAT
-
-config X86_SUMMIT_NUMA
- bool
- default y
- depends on X86_32 && NUMA && (X86_SUMMIT || X86_GENERICARCH)
-
-config X86_CYCLONE_TIMER
- bool
- default y
- depends on X86_32 && X86_SUMMIT || X86_GENERICARCH
-
-config ES7000_CLUSTERED_APIC
- bool
- default y
- depends on SMP && X86_ES7000 && MPENTIUMIII
-
-source "arch/x86/Kconfig.cpu"
-
-config HPET_TIMER
- bool
- prompt "HPET Timer Support" if X86_32
- default X86_64
- help
- Use the IA-PC HPET (High Precision Event Timer) to manage
- time in preference to the PIT and RTC, if a HPET is
- present.
- HPET is the next generation timer replacing legacy 8254s.
- The HPET provides a stable time base on SMP
- systems, unlike the TSC, but it is more expensive to access,
- as it is off-chip. You can find the HPET spec at
- <http://www.intel.com/hardwaredesign/hpetspec.htm>.
-
- You can safely choose Y here. However, HPET will only be
- activated if the platform and the BIOS support this feature.
- Otherwise the 8254 will be used for timing services.
-
- Choose N to continue using the legacy 8254 timer.
-
-config HPET_EMULATE_RTC
- bool
- depends on HPET_TIMER && RTC=y
- default y
-
-# Mark as embedded because too many people got it wrong.
-# The code disables itself when not needed.
-config GART_IOMMU
- bool "GART IOMMU support" if EMBEDDED
- default y
- select SWIOTLB
- select AGP
- depends on X86_64 && PCI
- help
- Support for full DMA access of devices with 32bit memory access only
- on systems with more than 3GB. This is usually needed for USB,
- sound, many IDE/SATA chipsets and some other devices.
- Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
- based hardware IOMMU and a software bounce buffer based IOMMU used
- on Intel systems and as fallback.
- The code is only active when needed (enough memory and limited
- device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
- too.
-
-config CALGARY_IOMMU
- bool "IBM Calgary IOMMU support"
- select SWIOTLB
- depends on X86_64 && PCI && EXPERIMENTAL
- help
- Support for hardware IOMMUs in IBM's xSeries x366 and x460
- systems. Needed to run systems with more than 3GB of memory
- properly with 32-bit PCI devices that do not support DAC
- (Double Address Cycle). Calgary also supports bus level
- isolation, where all DMAs pass through the IOMMU. This
- prevents them from going anywhere except their intended
- destination. This catches hard-to-find kernel bugs and
- mis-behaving drivers and devices that do not use the DMA-API
- properly to set up their DMA buffers. The IOMMU can be
- turned off at boot time with the iommu=off parameter.
- Normally the kernel will make the right choice by itself.
- If unsure, say Y.
-
-config CALGARY_IOMMU_ENABLED_BY_DEFAULT
- bool "Should Calgary be enabled by default?"
- default y
- depends on CALGARY_IOMMU
- help
- Should Calgary be enabled by default? if you choose 'y', Calgary
- will be used (if it exists). If you choose 'n', Calgary will not be
- used even if it exists. If you choose 'n' and would like to use
- Calgary anyway, pass 'iommu=calgary' on the kernel command line.
- If unsure, say Y.
-
-# need this always selected by IOMMU for the VIA workaround
-config SWIOTLB
- bool
- help
- Support for software bounce buffers used on x86-64 systems
- which don't have a hardware IOMMU (e.g. the current generation
- of Intel's x86-64 CPUs). Using this PCI devices which can only
- access 32-bits of memory can be used on systems with more than
- 3 GB of memory. If unsure, say Y.
-
-
-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 (X86_64 && SMP) || (X86_32 && X86_HT)
- 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.
-
-config SCHED_MC
- bool "Multi-core scheduler support"
- depends on (X86_64 && SMP) || (X86_32 && X86_HT)
- default y
- help
- Multi-core scheduler support improves the CPU scheduler's decision
- making when dealing with multi-core CPU chips 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 X86_32 && !SMP && !(X86_VISWS || X86_VOYAGER || X86_GENERICARCH)
- 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_64 || (X86_32 && (X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || X86_GENERICARCH))
- default y
-
-config X86_IO_APIC
- bool
- depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH))
- default y
-
-config X86_VISWS_APIC
- bool
- depends on X86_32 && X86_VISWS
- 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_INTEL
- bool "Intel MCE features"
- depends on X86_64 && X86_MCE && X86_LOCAL_APIC
- default y
- help
- Additional support for intel specific MCE features such as
- the thermal monitor.
-
-config X86_MCE_AMD
- bool "AMD MCE features"
- depends on X86_64 && X86_MCE && X86_LOCAL_APIC
- default y
- help
- Additional support for AMD specific MCE features such as
- the DRAM Error Threshold.
-
-config X86_MCE_NONFATAL
- tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
- depends on X86_32 && 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
- 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_32 && 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 VM86
- bool "Enable VM86 support" if EMBEDDED
- default y
- depends on X86_32
- help
- This option is required by programs like DOSEMU to run 16-bit legacy
- code on X86 processors. It also may be needed by software like
- XFree86 to initialize some video cards via BIOS. Disabling this
- option saves about 6k.
-
-config TOSHIBA
- tristate "Toshiba Laptop support"
- depends on X86_32
- ---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"
- depends on X86_32
- ---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_32 && 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 machines using
- CS5530A and CS5536 chipsets.
-
- 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"
- select FW_LOADER
- ---help---
- If you say Y here, 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 MICROCODE_OLD_INTERFACE
- bool
- depends on MICROCODE
- default y
-
-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.
-
-choice
- prompt "High Memory Support"
- default HIGHMEM4G if !X86_NUMAQ
- default HIGHMEM64G if X86_NUMAQ
- depends on X86_32
-
-config NOHIGHMEM
- bool "off"
- depends on !X86_NUMAQ
- ---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"
- depends on !X86_NUMAQ
- help
- Select this if you have a 32-bit processor and between 1 and 4
- gigabytes of physical RAM.
-
-config HIGHMEM64G
- bool "64GB"
- depends on !M386 && !M486
- select X86_PAE
- help
- Select this if you have a 32-bit processor and more than 4
- gigabytes of physical RAM.
-
-endchoice
-
-choice
- depends on EXPERIMENTAL
- prompt "Memory split" if EMBEDDED
- default VMSPLIT_3G
- depends on X86_32
- help
- Select the desired split between kernel and user memory.
-
- If the address range available to the kernel is less than the
- physical memory installed, the remaining memory will be available
- as "high memory". Accessing high memory is a little more costly
- than low memory, as it needs to be mapped into the kernel first.
- Note that increasing the kernel address space limits the range
- available to user programs, making the address space there
- tighter. Selecting anything other than the default 3G/1G split
- will also likely make your kernel incompatible with binary-only
- kernel modules.
-
- If you are not absolutely sure what you are doing, leave this
- option alone!
-
- config VMSPLIT_3G
- bool "3G/1G user/kernel split"
- config VMSPLIT_3G_OPT
- depends on !X86_PAE
- bool "3G/1G user/kernel split (for full 1G low memory)"
- config VMSPLIT_2G
- bool "2G/2G user/kernel split"
- config VMSPLIT_2G_OPT
- depends on !X86_PAE
- bool "2G/2G user/kernel split (for full 2G low memory)"
- config VMSPLIT_1G
- bool "1G/3G user/kernel split"
-endchoice
-
-config PAGE_OFFSET
- hex
- default 0xB0000000 if VMSPLIT_3G_OPT
- default 0x80000000 if VMSPLIT_2G
- default 0x78000000 if VMSPLIT_2G_OPT
- default 0x40000000 if VMSPLIT_1G
- default 0xC0000000
- depends on X86_32
-
-config HIGHMEM
- bool
- depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
- default y
-
-config X86_PAE
- bool "PAE (Physical Address Extension) Support"
- default n
- depends on X86_32 && !HIGHMEM4G
- select RESOURCES_64BIT
- help
- PAE is required for NX support, and furthermore enables
- larger swapspace support for non-overcommit purposes. It
- has the cost of more pagetable lookup overhead, and also
- consumes more pagetable space per process.
-
-# Common NUMA Features
-config NUMA
- bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
- depends on SMP
- depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL)
- default n if X86_PC
- default y if (X86_NUMAQ || X86_SUMMIT)
- help
- Enable NUMA (Non Uniform Memory Access) support.
- The kernel will try to allocate memory used by a CPU on the
- local memory controller of the CPU and add some more
- NUMA awareness to the kernel.
-
- For i386 this is currently highly experimental and should be only
- used for kernel development. It might also cause boot failures.
- For x86_64 this is recommended on all multiprocessor Opteron systems.
- If the system is EM64T, you should say N unless your system is
- EM64T NUMA.
-
-comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
- depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
-
-config K8_NUMA
- bool "Old style AMD Opteron NUMA detection"
- depends on X86_64 && NUMA && PCI
- default y
- help
- Enable K8 NUMA node topology detection. You should say Y here if
- you have a multi processor AMD K8 system. This uses an old
- method to read the NUMA configuration directly from the builtin
- Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
- instead, which also takes priority if both are compiled in.
-
-config X86_64_ACPI_NUMA
- bool "ACPI NUMA detection"
- depends on X86_64 && NUMA && ACPI && PCI
- select ACPI_NUMA
- default y
- help
- Enable ACPI SRAT based node topology detection.
-
-config NUMA_EMU
- bool "NUMA emulation"
- depends on X86_64 && NUMA
- help
- Enable NUMA emulation. A flat machine will be split
- into virtual nodes when booted with "numa=fake=N", where N is the
- number of nodes. This is only useful for debugging.
-
-config NODES_SHIFT
- int
- default "6" if X86_64
- default "4" if X86_NUMAQ
- default "3"
- depends on NEED_MULTIPLE_NODES
-
-config HAVE_ARCH_BOOTMEM_NODE
- bool
- depends on X86_32 && NUMA
- default y
-
-config ARCH_HAVE_MEMORY_PRESENT
- bool
- depends on X86_32 && DISCONTIGMEM
- default y
-
-config NEED_NODE_MEMMAP_SIZE
- bool
- depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
- default y
-
-config HAVE_ARCH_ALLOC_REMAP
- bool
- depends on X86_32 && NUMA
- default y
-
-config ARCH_FLATMEM_ENABLE
- def_bool y
- depends on (X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC) || (X86_64 && !NUMA)
-
-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 || (EXPERIMENTAL && (X86_PC || X86_64))
- select SPARSEMEM_STATIC if X86_32
- select SPARSEMEM_VMEMMAP_ENABLE if X86_64
-
-config ARCH_SELECT_MEMORY_MODEL
- def_bool y
- depends on X86_32 && ARCH_SPARSEMEM_ENABLE
-
-config ARCH_MEMORY_PROBE
- def_bool X86_64
- depends on MEMORY_HOTPLUG
-
-source "mm/Kconfig"
-
-config HIGHPTE
- bool "Allocate 3rd-level pagetables from highmem"
- depends on X86_32 && (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
- prompt "Math emulation" if X86_32
- ---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/x86/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"
- depends on X86_32 && ACPI
- default n
- ---help---
- This enables 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 X86_32 && 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.
-
-# turning this on wastes a bunch of space.
-# Summit needs it only when NUMA is on
-config BOOT_IOREMAP
- bool
- depends on X86_32 && (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
- default y
-
-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.
-
-config CC_STACKPROTECTOR
- bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
- depends on X86_64 && EXPERIMENTAL
- help
- This option turns on the -fstack-protector GCC feature. This
- feature puts, at the beginning of critical functions, a canary
- value on the stack just before the return address, and validates
- the value just before actually returning. Stack based buffer
- overflows (that need to overwrite this return address) now also
- overwrite the canary, which gets detected and the attack is then
- neutralized via a kernel panic.
-
- This feature requires gcc version 4.2 or above, or a distribution
- gcc with the feature backported. Older versions are automatically
- detected and for those versions, this configuration option is ignored.
-
-config CC_STACKPROTECTOR_ALL
- bool "Use stack-protector for all functions"
- depends on CC_STACKPROTECTOR
- help
- Normally, GCC only inserts the canary value protection for
- functions that use large-ish on-stack buffers. By enabling
- this option, GCC will be asked to do this for ALL functions.
-
-source kernel/Kconfig.hz
-
-config KEXEC
- bool "kexec system call"
- help
- kexec is a system call that implements the ability to shutdown your
- current kernel, and to start another kernel. It is like a reboot
- but it is independent of the system firmware. And like a reboot
- you can start any kernel with it, not just Linux.
-
- The name comes from the similarity to the exec system call.
-
- It is an ongoing process to be certain the hardware in a machine
- is properly shutdown, so do not be surprised if this code does not
- initially work for you. It may help to enable device hotplugging
- support. As of this writing the exact hardware interface is
- strongly in flux, so no good recommendation can be made.
-
-config CRASH_DUMP
- bool "kernel crash dumps (EXPERIMENTAL)"
- depends on EXPERIMENTAL
- depends on X86_64 || (X86_32 && HIGHMEM)
- help
- Generate crash dump after being started by kexec.
- This should be normally only set in special crash dump kernels
- which are loaded in the main kernel with kexec-tools into
- a specially reserved region and then later executed after
- a crash by kdump/kexec. The crash dump kernel must be compiled
- to a memory address not used by the main kernel or BIOS using
- PHYSICAL_START, or it must be built as a relocatable image
- (CONFIG_RELOCATABLE=y).
- For more details see Documentation/kdump/kdump.txt
-
-config PHYSICAL_START
- hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
- default "0x1000000" if X86_NUMAQ
- default "0x200000" if X86_64
- default "0x100000"
- help
- This gives the physical address where the kernel is loaded.
-
- If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
- bzImage will decompress itself to above physical address and
- run from there. Otherwise, bzImage will run from the address where
- it has been loaded by the boot loader and will ignore above physical
- address.
-
- In normal kdump cases one does not have to set/change this option
- as now bzImage can be compiled as a completely relocatable image
- (CONFIG_RELOCATABLE=y) and be used to load and run from a different
- address. This option is mainly useful for the folks who don't want
- to use a bzImage for capturing the crash dump and want to use a
- vmlinux instead. vmlinux is not relocatable hence a kernel needs
- to be specifically compiled to run from a specific memory area
- (normally a reserved region) and this option comes handy.
-
- So if you are using bzImage for capturing the crash dump, leave
- the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
- Otherwise if you plan to use vmlinux for capturing the crash dump
- change this value to start of the reserved region (Typically 16MB
- 0x1000000). In other words, it can be set based on the "X" value as
- specified in the "crashkernel=YM@XM" command line boot parameter
- passed to the panic-ed kernel. Typically this parameter is set as
- crashkernel=64M@16M. Please take a look at
- Documentation/kdump/kdump.txt for more details about crash dumps.
-
- Usage of bzImage for capturing the crash dump is recommended as
- one does not have to build two kernels. Same kernel can be used
- as production kernel and capture kernel. Above option should have
- gone away after relocatable bzImage support is introduced. But it
- is present because there are users out there who continue to use
- vmlinux for dump capture. This option should go away down the
- line.
-
- Don't change this unless you know what you are doing.
-
-config RELOCATABLE
- bool "Build a relocatable kernel (EXPERIMENTAL)"
- depends on EXPERIMENTAL
- help
- This builds a kernel image that retains relocation information
- so it can be loaded someplace besides the default 1MB.
- The relocations tend to make the kernel binary about 10% larger,
- but are discarded at runtime.
-
- One use is for the kexec on panic case where the recovery kernel
- must live at a different physical address than the primary
- kernel.
-
- Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
- it has been loaded at and the compile time physical address
- (CONFIG_PHYSICAL_START) is ignored.
-
-config PHYSICAL_ALIGN
- hex
- prompt "Alignment value to which kernel should be aligned" if X86_32
- default "0x100000" if X86_32
- default "0x200000" if X86_64
- range 0x2000 0x400000
- help
- This value puts the alignment restrictions on physical address
- where kernel is loaded and run from. Kernel is compiled for an
- address which meets above alignment restriction.
-
- If bootloader loads the kernel at a non-aligned address and
- CONFIG_RELOCATABLE is set, kernel will move itself to nearest
- address aligned to above value and run from there.
-
- If bootloader loads the kernel at a non-aligned address and
- CONFIG_RELOCATABLE is not set, kernel will ignore the run time
- load address and decompress itself to the address it has been
- compiled for and run from there. The address for which kernel is
- compiled already meets above alignment restrictions. Hence the
- end result is that kernel runs from a physical address meeting
- above alignment restrictions.
-
- Don't change this unless you know what you are doing.
-
-config HOTPLUG_CPU
- bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
- depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
- ---help---
- Say Y here to experiment with turning CPUs off and on, and to
- enable suspend on SMP systems. CPUs can be controlled through
- /sys/devices/system/cpu.
- Say N if you want to disable CPU hotplug and don't need to
- suspend.
-
-config COMPAT_VDSO
- bool "Compat VDSO support"
- default y
- depends on X86_32
- help
- Map the VDSO to the predictable old-style address too.
- ---help---
- Say N here if you are running a sufficiently recent glibc
- version (2.3.3 or later), to remove the high-mapped
- VDSO mapping and to exclusively use the randomized VDSO.
-
- If unsure, say Y.
-
-endmenu
-
-config ARCH_ENABLE_MEMORY_HOTPLUG
- def_bool y
- depends on X86_64 || (X86_32 && HIGHMEM)
-
-config MEMORY_HOTPLUG_RESERVE
- def_bool X86_64
- depends on (MEMORY_HOTPLUG && DISCONTIGMEM)
-
-config HAVE_ARCH_EARLY_PFN_TO_NID
- def_bool X86_64
- depends on NUMA
-
-config OUT_OF_LINE_PFN_TO_PAGE
- def_bool X86_64
- depends on DISCONTIGMEM
source "arch/x86/Kconfig"
classical 32-bit x86 architecture. For details see
<http://www.x86-64.org/>.
-source "init/Kconfig"
-
-
-menu "Processor type and features"
-
-source "kernel/time/Kconfig"
-
-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_VSMP
- bool "Support for ScaleMP vSMP"
- depends on X86_64 && PCI
- help
- Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
- supposed to run on these EM64T-based machines. Only choose this option
- if you have one of these machines.
-
-endchoice
-
-source "arch/x86/Kconfig.cpu"
-
-config MICROCODE
- tristate "/dev/cpu/microcode - Intel CPU microcode support"
- select FW_LOADER
- ---help---
- If you say Y here the 'File systems' section, you will be
- able to update the microcode on Intel processors. 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.
- 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 MICROCODE_OLD_INTERFACE
- bool
- depends on MICROCODE
- default y
-
-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 MATH_EMULATION
- bool
-
-config MCA
- bool
-
-config EISA
- bool
-
-config X86_IO_APIC
- bool
- default y
-
-config X86_LOCAL_APIC
- bool
- default y
-
-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.
-
- 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.
-
- Just say Y here, all x86-64 machines support MTRRs.
-
- See <file:Documentation/mtrr.txt> for more information.
-
-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.
-
- If you don't know what to do here, say N.
-
-config SCHED_SMT
- bool "SMT (Hyperthreading) scheduler support"
- depends on SMP
- default n
- 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.
-
-config SCHED_MC
- bool "Multi-core scheduler support"
- depends on SMP
- default y
- help
- Multi-core scheduler support improves the CPU scheduler's decision
- making when dealing with multi-core CPU chips at a cost of slightly
- increased overhead in some places. If unsure say N here.
-
-source "kernel/Kconfig.preempt"
-
-config NUMA
- bool "Non Uniform Memory Access (NUMA) Support"
- depends on SMP
- help
- Enable NUMA (Non Uniform Memory Access) support. The kernel
- will try to allocate memory used by a CPU on the local memory
- controller of the CPU and add some more NUMA awareness to the kernel.
- This code is recommended on all multiprocessor Opteron systems.
- If the system is EM64T, you should say N unless your system is EM64T
- NUMA.
-
-config K8_NUMA
- bool "Old style AMD Opteron NUMA detection"
- depends on X86_64 && NUMA && PCI
- default y
- help
- Enable K8 NUMA node topology detection. You should say Y here if
- you have a multi processor AMD K8 system. This uses an old
- method to read the NUMA configuration directly from the builtin
- Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
- instead, which also takes priority if both are compiled in.
-
-config NODES_SHIFT
- int
- default "6" if X86_64
- depends on NEED_MULTIPLE_NODES
-
-# Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
-
-config X86_64_ACPI_NUMA
- bool "ACPI NUMA detection"
- depends on X86_64 && NUMA
- select ACPI
- select PCI
- select ACPI_NUMA
- default y
- help
- Enable ACPI SRAT based node topology detection.
-
-config NUMA_EMU
- bool "NUMA emulation"
- depends on X86_64 && NUMA
- help
- Enable NUMA emulation. A flat machine will be split
- into virtual nodes when booted with "numa=fake=N", where N is the
- number of nodes. This is only useful for debugging.
-
-config ARCH_DISCONTIGMEM_ENABLE
- bool
- depends on NUMA
- default y
-
-config ARCH_DISCONTIGMEM_DEFAULT
- def_bool y
- depends on NUMA
-
-config ARCH_SPARSEMEM_ENABLE
- def_bool y
- depends on (NUMA || EXPERIMENTAL)
- select SPARSEMEM_VMEMMAP_ENABLE
-
-config ARCH_MEMORY_PROBE
- def_bool X86_64
- depends on MEMORY_HOTPLUG
-
-config ARCH_FLATMEM_ENABLE
- def_bool y
- depends on !NUMA
-
-source "mm/Kconfig"
-
-config MEMORY_HOTPLUG_RESERVE
- def_bool X86_64
- depends on (MEMORY_HOTPLUG && DISCONTIGMEM)
-
-config HAVE_ARCH_EARLY_PFN_TO_NID
- def_bool X86_64
- depends on NUMA
-
-config OUT_OF_LINE_PFN_TO_PAGE
- def_bool X86_64
- depends on DISCONTIGMEM
-
-config NR_CPUS
- int "Maximum number of CPUs (2-255)"
- range 2 255
- depends on SMP
- default "8"
- help
- This allows you to specify the maximum number of CPUs which this
- kernel will support. Current maximum is 255 CPUs due to
- APIC addressing limits. Less depending on the hardware.
-
- This is purely to save memory - each supported CPU requires
- memory in the static kernel configuration.
-
-config PHYSICAL_ALIGN
- hex
- default "0x200000" if X86_64
-
-config HOTPLUG_CPU
- bool "Support for suspend on SMP and 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/cpu#.
- This is also required for suspend/hibernation on SMP systems.
-
- Say N if you want to disable CPU hotplug and don't need to
- suspend.
-
-config ARCH_ENABLE_MEMORY_HOTPLUG
- def_bool y
-
-config HPET_TIMER
- bool
- default y
- help
- Use the IA-PC HPET (High Precision Event Timer) to manage
- time in preference to the PIT and RTC, if a HPET is
- present. The HPET provides a stable time base on SMP
- systems, unlike the TSC, but it is more expensive to access,
- as it is off-chip. You can find the HPET spec at
- <http://www.intel.com/hardwaredesign/hpetspec.htm>.
-
-config HPET_EMULATE_RTC
- bool
- depends on HPET_TIMER && RTC=y
- default y
-
-# Mark as embedded because too many people got it wrong.
-# The code disables itself when not needed.
-config GART_IOMMU
- bool "GART IOMMU support" if EMBEDDED
- default y
- select SWIOTLB
- select AGP
- depends on X86_64 && PCI
- help
- Support for full DMA access of devices with 32bit memory access only
- on systems with more than 3GB. This is usually needed for USB,
- sound, many IDE/SATA chipsets and some other devices.
- Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
- based hardware IOMMU and a software bounce buffer based IOMMU used
- on Intel systems and as fallback.
- The code is only active when needed (enough memory and limited
- device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
- too.
-
-config CALGARY_IOMMU
- bool "IBM Calgary IOMMU support"
- select SWIOTLB
- depends on X86_64 && PCI && EXPERIMENTAL
- help
- Support for hardware IOMMUs in IBM's xSeries x366 and x460
- systems. Needed to run systems with more than 3GB of memory
- properly with 32-bit PCI devices that do not support DAC
- (Double Address Cycle). Calgary also supports bus level
- isolation, where all DMAs pass through the IOMMU. This
- prevents them from going anywhere except their intended
- destination. This catches hard-to-find kernel bugs and
- mis-behaving drivers and devices that do not use the DMA-API
- properly to set up their DMA buffers. The IOMMU can be
- turned off at boot time with the iommu=off parameter.
- Normally the kernel will make the right choice by itself.
- If unsure, say Y.
-
-config CALGARY_IOMMU_ENABLED_BY_DEFAULT
- bool "Should Calgary be enabled by default?"
- default y
- depends on CALGARY_IOMMU
- help
- Should Calgary be enabled by default? if you choose 'y', Calgary
- will be used (if it exists). If you choose 'n', Calgary will not be
- used even if it exists. If you choose 'n' and would like to use
- Calgary anyway, pass 'iommu=calgary' on the kernel command line.
- If unsure, say Y.
-
-# need this always selected by IOMMU for the VIA workaround
-config SWIOTLB
- bool
- help
- Support for software bounce buffers used on x86-64 systems
- which don't have a hardware IOMMU (e.g. the current generation
- of Intel's x86-64 CPUs). Using this PCI devices which can only
- access 32-bits of memory can be used on systems with more than
- 3 GB of memory. If unsure, say Y.
-
-config X86_MCE
- bool "Machine check support" if EMBEDDED
- default y
- help
- Include a machine check error handler to report hardware errors.
- This version will require the mcelog utility to decode some
- machine check error logs. See
- ftp://ftp.x86-64.org/pub/linux/tools/mcelog
-
-config X86_MCE_INTEL
- bool "Intel MCE features"
- depends on X86_64 && X86_MCE && X86_LOCAL_APIC
- default y
- help
- Additional support for intel specific MCE features such as
- the thermal monitor.
-
-config X86_MCE_AMD
- bool "AMD MCE features"
- depends on X86_64 && X86_MCE && X86_LOCAL_APIC
- default y
- help
- Additional support for AMD specific MCE features such as
- the DRAM Error Threshold.
-
-config KEXEC
- bool "kexec system call"
- help
- kexec is a system call that implements the ability to shutdown your
- current kernel, and to start another kernel. It is like a reboot
- but it is independent of the system firmware. And like a reboot
- you can start any kernel with it, not just Linux.
-
- The name comes from the similarity to the exec system call.
-
- It is an ongoing process to be certain the hardware in a machine
- is properly shutdown, so do not be surprised if this code does not
- initially work for you. It may help to enable device hotplugging
- support. As of this writing the exact hardware interface is
- strongly in flux, so no good recommendation can be made.
-
-config CRASH_DUMP
- bool "kernel crash dumps (EXPERIMENTAL)"
- depends on EXPERIMENTAL
- help
- Generate crash dump after being started by kexec.
- This should be normally only set in special crash dump kernels
- which are loaded in the main kernel with kexec-tools into
- a specially reserved region and then later executed after
- a crash by kdump/kexec. The crash dump kernel must be compiled
- to a memory address not used by the main kernel or BIOS using
- PHYSICAL_START, or it must be built as a relocatable image
- (CONFIG_RELOCATABLE=y).
- For more details see Documentation/kdump/kdump.txt
-
-config RELOCATABLE
- bool "Build a relocatable kernel (EXPERIMENTAL)"
- depends on EXPERIMENTAL
- help
- Builds a relocatable kernel. This enables loading and running
- a kernel binary from a different physical address than it has
- been compiled for.
-
- One use is for the kexec on panic case where the recovery kernel
- must live at a different physical address than the primary
- kernel.
-
- Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
- it has been loaded at and the compile time physical address
- (CONFIG_PHYSICAL_START) is ignored.
-
-config PHYSICAL_START
- hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
- default "0x200000"
- help
- This gives the physical address where the kernel is loaded. It
- should be aligned to 2MB boundary.
-
- If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
- bzImage will decompress itself to above physical address and
- run from there. Otherwise, bzImage will run from the address where
- it has been loaded by the boot loader and will ignore above physical
- address.
-
- In normal kdump cases one does not have to set/change this option
- as now bzImage can be compiled as a completely relocatable image
- (CONFIG_RELOCATABLE=y) and be used to load and run from a different
- address. This option is mainly useful for the folks who don't want
- to use a bzImage for capturing the crash dump and want to use a
- vmlinux instead.
-
- So if you are using bzImage for capturing the crash dump, leave
- the value here unchanged to 0x200000 and set CONFIG_RELOCATABLE=y.
- Otherwise if you plan to use vmlinux for capturing the crash dump
- change this value to start of the reserved region (Typically 16MB
- 0x1000000). In other words, it can be set based on the "X" value as
- specified in the "crashkernel=YM@XM" command line boot parameter
- passed to the panic-ed kernel. Typically this parameter is set as
- crashkernel=64M@16M. Please take a look at
- Documentation/kdump/kdump.txt for more details about crash dumps.
-
- Usage of bzImage for capturing the crash dump is advantageous as
- one does not have to build two kernels. Same kernel can be used
- as production kernel and capture kernel.
-
- Don't change this unless you know what you are doing.
-
-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.
-
-config CC_STACKPROTECTOR
- bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
- depends on X86_64 && EXPERIMENTAL
- help
- This option turns on the -fstack-protector GCC feature. This
- feature puts, at the beginning of critical functions, a canary
- value on the stack just before the return address, and validates
- the value just before actually returning. Stack based buffer
- overflows (that need to overwrite this return address) now also
- overwrite the canary, which gets detected and the attack is then
- neutralized via a kernel panic.
-
- This feature requires gcc version 4.2 or above, or a distribution
- gcc with the feature backported. Older versions are automatically
- detected and for those versions, this configuration option is ignored.
-
-config CC_STACKPROTECTOR_ALL
- bool "Use stack-protector for all functions"
- depends on CC_STACKPROTECTOR
- help
- Normally, GCC only inserts the canary value protection for
- functions that use large-ish on-stack buffers. By enabling
- this option, GCC will be asked to do this for ALL functions.
-
-source kernel/Kconfig.hz
-
-config K8_NB
- def_bool X86_64
- depends on AGP_AMD64 || GART_IOMMU || (PCI && NUMA)
-
-endmenu
-
source "arch/x86/Kconfig"
projects / linux-2.6-omap-h63xx.git / commitdiff