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Diffstat (limited to 'arch/x86/Kconfig.i386')
| -rw-r--r-- | arch/x86/Kconfig.i386 | 1053 |
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diff --git a/arch/x86/Kconfig.i386 b/arch/x86/Kconfig.i386 index b8b462a91dc..7b8dc2604d5 100644 --- a/arch/x86/Kconfig.i386 +++ b/arch/x86/Kconfig.i386 @@ -14,1058 +14,5 @@ config X86_32 486, 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" |