1909 lines
61 KiB
Text
1909 lines
61 KiB
Text
# x86 configuration
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mainmenu "Linux Kernel Configuration for x86"
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# Select 32 or 64 bit
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config 64BIT
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bool "64-bit kernel" if ARCH = "x86"
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default ARCH = "x86_64"
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help
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Say yes to build a 64-bit kernel - formerly known as x86_64
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Say no to build a 32-bit kernel - formerly known as i386
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config X86_32
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def_bool !64BIT
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config X86_64
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def_bool 64BIT
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### Arch settings
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config X86
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def_bool y
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select HAVE_AOUT if X86_32
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select HAVE_UNSTABLE_SCHED_CLOCK
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select HAVE_IDE
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select HAVE_OPROFILE
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select HAVE_IOREMAP_PROT
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select HAVE_KPROBES
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select ARCH_WANT_OPTIONAL_GPIOLIB
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select HAVE_KRETPROBES
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select HAVE_FTRACE_MCOUNT_RECORD
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select HAVE_DYNAMIC_FTRACE
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select HAVE_FUNCTION_TRACER
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select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
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select HAVE_ARCH_KGDB if !X86_VOYAGER
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select HAVE_ARCH_TRACEHOOK
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select HAVE_GENERIC_DMA_COHERENT if X86_32
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select HAVE_EFFICIENT_UNALIGNED_ACCESS
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config ARCH_DEFCONFIG
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string
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default "arch/x86/configs/i386_defconfig" if X86_32
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default "arch/x86/configs/x86_64_defconfig" if X86_64
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config GENERIC_TIME
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def_bool y
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config GENERIC_CMOS_UPDATE
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def_bool y
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config CLOCKSOURCE_WATCHDOG
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def_bool y
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config GENERIC_CLOCKEVENTS
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def_bool y
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config GENERIC_CLOCKEVENTS_BROADCAST
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def_bool y
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depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
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config LOCKDEP_SUPPORT
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def_bool y
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config STACKTRACE_SUPPORT
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def_bool y
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config HAVE_LATENCYTOP_SUPPORT
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def_bool y
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config FAST_CMPXCHG_LOCAL
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bool
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default y
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config MMU
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def_bool y
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config ZONE_DMA
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def_bool y
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config SBUS
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bool
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config GENERIC_ISA_DMA
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def_bool y
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config GENERIC_IOMAP
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def_bool y
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config GENERIC_BUG
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def_bool y
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depends on BUG
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config GENERIC_HWEIGHT
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def_bool y
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config GENERIC_GPIO
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bool
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config ARCH_MAY_HAVE_PC_FDC
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def_bool y
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config RWSEM_GENERIC_SPINLOCK
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def_bool !X86_XADD
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config RWSEM_XCHGADD_ALGORITHM
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def_bool X86_XADD
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config ARCH_HAS_CPU_IDLE_WAIT
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def_bool y
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config GENERIC_CALIBRATE_DELAY
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def_bool y
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config GENERIC_TIME_VSYSCALL
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bool
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default X86_64
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config ARCH_HAS_CPU_RELAX
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def_bool y
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config ARCH_HAS_DEFAULT_IDLE
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def_bool y
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config ARCH_HAS_CACHE_LINE_SIZE
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def_bool y
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config HAVE_SETUP_PER_CPU_AREA
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def_bool X86_64_SMP || (X86_SMP && !X86_VOYAGER)
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config HAVE_CPUMASK_OF_CPU_MAP
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def_bool X86_64_SMP
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config ARCH_HIBERNATION_POSSIBLE
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def_bool y
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depends on !SMP || !X86_VOYAGER
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config ARCH_SUSPEND_POSSIBLE
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def_bool y
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depends on !X86_VOYAGER
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config ZONE_DMA32
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bool
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default X86_64
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config ARCH_POPULATES_NODE_MAP
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def_bool y
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config AUDIT_ARCH
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bool
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default X86_64
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config ARCH_SUPPORTS_OPTIMIZED_INLINING
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def_bool y
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# Use the generic interrupt handling code in kernel/irq/:
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config GENERIC_HARDIRQS
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bool
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default y
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config GENERIC_IRQ_PROBE
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bool
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default y
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config GENERIC_PENDING_IRQ
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bool
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depends on GENERIC_HARDIRQS && SMP
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default y
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config X86_SMP
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bool
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depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
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select USE_GENERIC_SMP_HELPERS
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default y
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config X86_32_SMP
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def_bool y
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depends on X86_32 && SMP
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config X86_64_SMP
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def_bool y
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depends on X86_64 && SMP
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config X86_HT
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bool
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depends on SMP
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depends on (X86_32 && !X86_VOYAGER) || X86_64
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default y
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config X86_BIOS_REBOOT
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bool
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depends on !X86_VOYAGER
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default y
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config X86_TRAMPOLINE
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bool
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depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
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default y
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config KTIME_SCALAR
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def_bool X86_32
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source "init/Kconfig"
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source "kernel/Kconfig.freezer"
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menu "Processor type and features"
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source "kernel/time/Kconfig"
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config SMP
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bool "Symmetric multi-processing support"
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---help---
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This enables support for systems with more than one CPU. If you have
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a system with only one CPU, like most personal computers, say N. If
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you have a system with more than one CPU, say Y.
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If you say N here, the kernel will run on single and multiprocessor
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machines, but will use only one CPU of a multiprocessor machine. If
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you say Y here, the kernel will run on many, but not all,
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singleprocessor machines. On a singleprocessor machine, the kernel
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will run faster if you say N here.
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Note that if you say Y here and choose architecture "586" or
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"Pentium" under "Processor family", the kernel will not work on 486
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architectures. Similarly, multiprocessor kernels for the "PPro"
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architecture may not work on all Pentium based boards.
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People using multiprocessor machines who say Y here should also say
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Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
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Management" code will be disabled if you say Y here.
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See also <file:Documentation/i386/IO-APIC.txt>,
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<file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
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<http://www.tldp.org/docs.html#howto>.
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If you don't know what to do here, say N.
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config X86_HAS_BOOT_CPU_ID
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def_bool y
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depends on X86_VOYAGER
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config X86_FIND_SMP_CONFIG
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def_bool y
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depends on X86_MPPARSE || X86_VOYAGER
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config X86_MPPARSE
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bool "Enable MPS table" if ACPI
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default y
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depends on X86_LOCAL_APIC
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help
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For old smp systems that do not have proper acpi support. Newer systems
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(esp with 64bit cpus) with acpi support, MADT and DSDT will override it
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choice
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prompt "Subarchitecture Type"
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default X86_PC
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config X86_PC
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bool "PC-compatible"
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help
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Choose this option if your computer is a standard PC or compatible.
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config X86_ELAN
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bool "AMD Elan"
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depends on X86_32
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help
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Select this for an AMD Elan processor.
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Do not use this option for K6/Athlon/Opteron processors!
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If unsure, choose "PC-compatible" instead.
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config X86_VOYAGER
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bool "Voyager (NCR)"
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depends on X86_32 && (SMP || BROKEN) && !PCI
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help
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Voyager is an MCA-based 32-way capable SMP architecture proprietary
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to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
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*** WARNING ***
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If you do not specifically know you have a Voyager based machine,
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say N here, otherwise the kernel you build will not be bootable.
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config X86_GENERICARCH
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bool "Generic architecture"
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depends on X86_32
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help
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This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
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subarchitectures. It is intended for a generic binary kernel.
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if you select them all, kernel will probe it one by one. and will
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fallback to default.
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if X86_GENERICARCH
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config X86_NUMAQ
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bool "NUMAQ (IBM/Sequent)"
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depends on SMP && X86_32 && PCI && X86_MPPARSE
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select NUMA
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help
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This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
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NUMA multiquad box. This changes the way that processors are
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bootstrapped, and uses Clustered Logical APIC addressing mode instead
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of Flat Logical. You will need a new lynxer.elf file to flash your
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firmware with - send email to <Martin.Bligh@us.ibm.com>.
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config X86_SUMMIT
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bool "Summit/EXA (IBM x440)"
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depends on X86_32 && SMP
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help
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This option is needed for IBM systems that use the Summit/EXA chipset.
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In particular, it is needed for the x440.
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config X86_ES7000
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bool "Support for Unisys ES7000 IA32 series"
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depends on X86_32 && SMP
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help
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Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
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supposed to run on an IA32-based Unisys ES7000 system.
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config X86_BIGSMP
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bool "Support for big SMP systems with more than 8 CPUs"
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depends on X86_32 && SMP
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help
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This option is needed for the systems that have more than 8 CPUs
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and if the system is not of any sub-arch type above.
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endif
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config X86_VSMP
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bool "Support for ScaleMP vSMP"
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select PARAVIRT
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depends on X86_64 && PCI
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help
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Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
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supposed to run on these EM64T-based machines. Only choose this option
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if you have one of these machines.
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endchoice
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config X86_VISWS
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bool "SGI 320/540 (Visual Workstation)"
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depends on X86_32 && PCI && !X86_VOYAGER && X86_MPPARSE && PCI_GODIRECT
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help
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The SGI Visual Workstation series is an IA32-based workstation
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based on SGI systems chips with some legacy PC hardware attached.
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Say Y here to create a kernel to run on the SGI 320 or 540.
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A kernel compiled for the Visual Workstation will run on general
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PCs as well. See <file:Documentation/sgi-visws.txt> for details.
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config X86_RDC321X
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bool "RDC R-321x SoC"
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depends on X86_32
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select M486
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select X86_REBOOTFIXUPS
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help
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This option is needed for RDC R-321x system-on-chip, also known
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as R-8610-(G).
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If you don't have one of these chips, you should say N here.
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config SCHED_NO_NO_OMIT_FRAME_POINTER
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def_bool y
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prompt "Single-depth WCHAN output"
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depends on X86_32
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help
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Calculate simpler /proc/<PID>/wchan values. If this option
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is disabled then wchan values will recurse back to the
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caller function. This provides more accurate wchan values,
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at the expense of slightly more scheduling overhead.
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If in doubt, say "Y".
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menuconfig PARAVIRT_GUEST
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bool "Paravirtualized guest support"
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help
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Say Y here to get to see options related to running Linux under
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various hypervisors. This option alone does not add any kernel code.
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If you say N, all options in this submenu will be skipped and disabled.
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if PARAVIRT_GUEST
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source "arch/x86/xen/Kconfig"
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config VMI
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bool "VMI Guest support"
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select PARAVIRT
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depends on X86_32
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depends on !X86_VOYAGER
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help
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VMI provides a paravirtualized interface to the VMware ESX server
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(it could be used by other hypervisors in theory too, but is not
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at the moment), by linking the kernel to a GPL-ed ROM module
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provided by the hypervisor.
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config KVM_CLOCK
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bool "KVM paravirtualized clock"
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select PARAVIRT
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select PARAVIRT_CLOCK
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depends on !X86_VOYAGER
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help
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Turning on this option will allow you to run a paravirtualized clock
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when running over the KVM hypervisor. Instead of relying on a PIT
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(or probably other) emulation by the underlying device model, the host
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provides the guest with timing infrastructure such as time of day, and
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system time
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config KVM_GUEST
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bool "KVM Guest support"
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select PARAVIRT
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depends on !X86_VOYAGER
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help
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This option enables various optimizations for running under the KVM
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hypervisor.
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source "arch/x86/lguest/Kconfig"
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config PARAVIRT
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bool "Enable paravirtualization code"
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depends on !X86_VOYAGER
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help
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This changes the kernel so it can modify itself when it is run
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under a hypervisor, potentially improving performance significantly
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over full virtualization. However, when run without a hypervisor
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the kernel is theoretically slower and slightly larger.
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config PARAVIRT_CLOCK
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bool
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default n
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endif
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config PARAVIRT_DEBUG
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bool "paravirt-ops debugging"
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depends on PARAVIRT && DEBUG_KERNEL
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help
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Enable to debug paravirt_ops internals. Specifically, BUG if
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a paravirt_op is missing when it is called.
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config MEMTEST
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bool "Memtest"
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help
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This option adds a kernel parameter 'memtest', which allows memtest
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to be set.
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memtest=0, mean disabled; -- default
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memtest=1, mean do 1 test pattern;
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...
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memtest=4, mean do 4 test patterns.
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If you are unsure how to answer this question, answer N.
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config X86_SUMMIT_NUMA
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def_bool y
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depends on X86_32 && NUMA && X86_GENERICARCH
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config X86_CYCLONE_TIMER
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def_bool y
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depends on X86_GENERICARCH
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config ES7000_CLUSTERED_APIC
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def_bool y
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depends on SMP && X86_ES7000 && MPENTIUMIII
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source "arch/x86/Kconfig.cpu"
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config HPET_TIMER
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def_bool X86_64
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prompt "HPET Timer Support" if X86_32
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help
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Use the IA-PC HPET (High Precision Event Timer) to manage
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time in preference to the PIT and RTC, if a HPET is
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present.
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HPET is the next generation timer replacing legacy 8254s.
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The HPET provides a stable time base on SMP
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systems, unlike the TSC, but it is more expensive to access,
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as it is off-chip. You can find the HPET spec at
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<http://www.intel.com/hardwaredesign/hpetspec.htm>.
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You can safely choose Y here. However, HPET will only be
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activated if the platform and the BIOS support this feature.
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Otherwise the 8254 will be used for timing services.
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Choose N to continue using the legacy 8254 timer.
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config HPET_EMULATE_RTC
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def_bool y
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depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
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# Mark as embedded because too many people got it wrong.
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# The code disables itself when not needed.
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config DMI
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default y
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bool "Enable DMI scanning" if EMBEDDED
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help
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Enabled scanning of DMI to identify machine quirks. Say Y
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here unless you have verified that your setup is not
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affected by entries in the DMI blacklist. Required by PNP
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BIOS code.
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config GART_IOMMU
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bool "GART IOMMU support" if EMBEDDED
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default y
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select SWIOTLB
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select AGP
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depends on X86_64 && PCI
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help
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Support for full DMA access of devices with 32bit memory access only
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on systems with more than 3GB. This is usually needed for USB,
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sound, many IDE/SATA chipsets and some other devices.
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Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
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based hardware IOMMU and a software bounce buffer based IOMMU used
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on Intel systems and as fallback.
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The code is only active when needed (enough memory and limited
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device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
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too.
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config CALGARY_IOMMU
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bool "IBM Calgary IOMMU support"
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select SWIOTLB
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depends on X86_64 && PCI && EXPERIMENTAL
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help
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Support for hardware IOMMUs in IBM's xSeries x366 and x460
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systems. Needed to run systems with more than 3GB of memory
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properly with 32-bit PCI devices that do not support DAC
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(Double Address Cycle). Calgary also supports bus level
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isolation, where all DMAs pass through the IOMMU. This
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prevents them from going anywhere except their intended
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destination. This catches hard-to-find kernel bugs and
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mis-behaving drivers and devices that do not use the DMA-API
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properly to set up their DMA buffers. The IOMMU can be
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turned off at boot time with the iommu=off parameter.
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Normally the kernel will make the right choice by itself.
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If unsure, say Y.
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config CALGARY_IOMMU_ENABLED_BY_DEFAULT
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def_bool y
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prompt "Should Calgary be enabled by default?"
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depends on CALGARY_IOMMU
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help
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Should Calgary be enabled by default? if you choose 'y', Calgary
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will be used (if it exists). If you choose 'n', Calgary will not be
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used even if it exists. If you choose 'n' and would like to use
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Calgary anyway, pass 'iommu=calgary' on the kernel command line.
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If unsure, say Y.
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config AMD_IOMMU
|
|
bool "AMD IOMMU support"
|
|
select SWIOTLB
|
|
select PCI_MSI
|
|
depends on X86_64 && PCI && ACPI
|
|
help
|
|
With this option you can enable support for AMD IOMMU hardware in
|
|
your system. An IOMMU is a hardware component which provides
|
|
remapping of DMA memory accesses from devices. With an AMD IOMMU you
|
|
can isolate the the DMA memory of different devices and protect the
|
|
system from misbehaving device drivers or hardware.
|
|
|
|
You can find out if your system has an AMD IOMMU if you look into
|
|
your BIOS for an option to enable it or if you have an IVRS ACPI
|
|
table.
|
|
|
|
# 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 IOMMU_HELPER
|
|
def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
|
|
|
|
config MAXSMP
|
|
bool "Configure Maximum number of SMP Processors and NUMA Nodes"
|
|
depends on X86_64 && SMP && BROKEN
|
|
default n
|
|
help
|
|
Configure maximum number of CPUS and NUMA Nodes for this architecture.
|
|
If unsure, say N.
|
|
|
|
config NR_CPUS
|
|
int "Maximum number of CPUs (2-512)" if !MAXSMP
|
|
range 2 512
|
|
depends on SMP
|
|
default "4096" if MAXSMP
|
|
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 512 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_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
|
|
def_bool y
|
|
prompt "Multi-core scheduler support"
|
|
depends on X86_HT
|
|
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_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
|
|
def_bool y
|
|
depends on X86_64 || (X86_32 && (X86_UP_APIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
|
|
|
|
config X86_IO_APIC
|
|
def_bool y
|
|
depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
|
|
|
|
config X86_VISWS_APIC
|
|
def_bool y
|
|
depends on X86_32 && X86_VISWS
|
|
|
|
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
|
|
def_bool y
|
|
prompt "Intel MCE features"
|
|
depends on X86_64 && X86_MCE && X86_LOCAL_APIC
|
|
help
|
|
Additional support for intel specific MCE features such as
|
|
the thermal monitor.
|
|
|
|
config X86_MCE_AMD
|
|
def_bool y
|
|
prompt "AMD MCE features"
|
|
depends on X86_64 && X86_MCE && X86_LOCAL_APIC
|
|
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)
|
|
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"
|
|
---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
|
|
---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 and the RDC R-321x SoC.
|
|
|
|
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 - microcode support"
|
|
select FW_LOADER
|
|
---help---
|
|
If you say Y here, you will be able to update the microcode on
|
|
certain Intel and AMD processors. The Intel support is for the
|
|
IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
|
|
Pentium 4, Xeon etc. The AMD support is for family 0x10 and
|
|
0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
|
|
You will obviously need the actual microcode binary data itself
|
|
which is not shipped with the Linux kernel.
|
|
|
|
This option selects the general module only, you need to select
|
|
at least one vendor specific module as well.
|
|
|
|
To compile this driver as a module, choose M here: the
|
|
module will be called microcode.
|
|
|
|
config MICROCODE_INTEL
|
|
bool "Intel microcode patch loading support"
|
|
depends on MICROCODE
|
|
default MICROCODE
|
|
select FW_LOADER
|
|
--help---
|
|
This options enables microcode patch loading support for Intel
|
|
processors.
|
|
|
|
For latest news and information on obtaining all the required
|
|
Intel ingredients for this driver, check:
|
|
<http://www.urbanmyth.org/microcode/>.
|
|
|
|
config MICROCODE_AMD
|
|
bool "AMD microcode patch loading support"
|
|
depends on MICROCODE
|
|
select FW_LOADER
|
|
--help---
|
|
If you select this option, microcode patch loading support for AMD
|
|
processors will be enabled.
|
|
|
|
config MICROCODE_OLD_INTERFACE
|
|
def_bool y
|
|
depends on MICROCODE
|
|
|
|
config X86_MSR
|
|
tristate "/dev/cpu/*/msr - Model-specific register support"
|
|
help
|
|
This device gives privileged processes access to the x86
|
|
Model-Specific Registers (MSRs). It is a character device with
|
|
major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
|
|
MSR accesses are directed to a specific CPU on multi-processor
|
|
systems.
|
|
|
|
config X86_CPUID
|
|
tristate "/dev/cpu/*/cpuid - CPU information support"
|
|
help
|
|
This device gives processes access to the x86 CPUID instruction to
|
|
be executed on a specific processor. It is a character device
|
|
with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
|
|
/dev/cpu/31/cpuid.
|
|
|
|
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
|
|
def_bool y
|
|
depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
|
|
|
|
config X86_PAE
|
|
bool "PAE (Physical Address Extension) Support"
|
|
depends on X86_32 && !HIGHMEM4G
|
|
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.
|
|
|
|
config ARCH_PHYS_ADDR_T_64BIT
|
|
def_bool X86_64 || X86_PAE
|
|
|
|
# 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_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
|
|
default n if X86_PC
|
|
default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
|
|
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 32-bit this is currently highly experimental and should be only
|
|
used for kernel development. It might also cause boot failures.
|
|
For 64-bit 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
|
|
def_bool y
|
|
prompt "Old style AMD Opteron NUMA detection"
|
|
depends on X86_64 && NUMA && PCI
|
|
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
|
|
def_bool y
|
|
prompt "ACPI NUMA detection"
|
|
depends on X86_64 && NUMA && ACPI && PCI
|
|
select ACPI_NUMA
|
|
help
|
|
Enable ACPI SRAT based node topology detection.
|
|
|
|
# Some NUMA nodes have memory ranges that span
|
|
# other nodes. Even though a pfn is valid and
|
|
# between a node's start and end pfns, it may not
|
|
# reside on that node. See memmap_init_zone()
|
|
# for details.
|
|
config NODES_SPAN_OTHER_NODES
|
|
def_bool y
|
|
depends on X86_64_ACPI_NUMA
|
|
|
|
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 "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
|
|
range 1 9 if X86_64
|
|
default "9" if MAXSMP
|
|
default "6" if X86_64
|
|
default "4" if X86_NUMAQ
|
|
default "3"
|
|
depends on NEED_MULTIPLE_NODES
|
|
help
|
|
Specify the maximum number of NUMA Nodes available on the target
|
|
system. Increases memory reserved to accomodate various tables.
|
|
|
|
config HAVE_ARCH_BOOTMEM_NODE
|
|
def_bool y
|
|
depends on X86_32 && NUMA
|
|
|
|
config ARCH_HAVE_MEMORY_PRESENT
|
|
def_bool y
|
|
depends on X86_32 && DISCONTIGMEM
|
|
|
|
config NEED_NODE_MEMMAP_SIZE
|
|
def_bool y
|
|
depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
|
|
|
|
config HAVE_ARCH_ALLOC_REMAP
|
|
def_bool y
|
|
depends on X86_32 && NUMA
|
|
|
|
config ARCH_FLATMEM_ENABLE
|
|
def_bool y
|
|
depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
|
|
|
|
config ARCH_DISCONTIGMEM_ENABLE
|
|
def_bool y
|
|
depends on NUMA && X86_32
|
|
|
|
config ARCH_DISCONTIGMEM_DEFAULT
|
|
def_bool y
|
|
depends on NUMA && X86_32
|
|
|
|
config ARCH_SPARSEMEM_DEFAULT
|
|
def_bool y
|
|
depends on X86_64
|
|
|
|
config ARCH_SPARSEMEM_ENABLE
|
|
def_bool y
|
|
depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC) || X86_GENERICARCH
|
|
select SPARSEMEM_STATIC if X86_32
|
|
select SPARSEMEM_VMEMMAP_ENABLE if X86_64
|
|
|
|
config ARCH_SELECT_MEMORY_MODEL
|
|
def_bool y
|
|
depends on 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 X86_CHECK_BIOS_CORRUPTION
|
|
bool "Check for low memory corruption"
|
|
help
|
|
Periodically check for memory corruption in low memory, which
|
|
is suspected to be caused by BIOS. Even when enabled in the
|
|
configuration, it is disabled at runtime. Enable it by
|
|
setting "memory_corruption_check=1" on the kernel command
|
|
line. By default it scans the low 64k of memory every 60
|
|
seconds; see the memory_corruption_check_size and
|
|
memory_corruption_check_period parameters in
|
|
Documentation/kernel-parameters.txt to adjust this.
|
|
|
|
When enabled with the default parameters, this option has
|
|
almost no overhead, as it reserves a relatively small amount
|
|
of memory and scans it infrequently. It both detects corruption
|
|
and prevents it from affecting the running system.
|
|
|
|
It is, however, intended as a diagnostic tool; if repeatable
|
|
BIOS-originated corruption always affects the same memory,
|
|
you can use memmap= to prevent the kernel from using that
|
|
memory.
|
|
|
|
config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
|
|
bool "Set the default setting of memory_corruption_check"
|
|
depends on X86_CHECK_BIOS_CORRUPTION
|
|
default y
|
|
help
|
|
Set whether the default state of memory_corruption_check is
|
|
on or off.
|
|
|
|
config X86_RESERVE_LOW_64K
|
|
bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
|
|
default y
|
|
help
|
|
Reserve the first 64K of physical RAM on BIOSes that are known
|
|
to potentially corrupt that memory range. A numbers of BIOSes are
|
|
known to utilize this area during suspend/resume, so it must not
|
|
be used by the kernel.
|
|
|
|
Set this to N if you are absolutely sure that you trust the BIOS
|
|
to get all its memory reservations and usages right.
|
|
|
|
If you have doubts about the BIOS (e.g. suspend/resume does not
|
|
work or there's kernel crashes after certain hardware hotplug
|
|
events) and it's not AMI or Phoenix, then you might want to enable
|
|
X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
|
|
corruption patterns.
|
|
|
|
Say Y if unsure.
|
|
|
|
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/x86/mtrr.txt> for more information.
|
|
|
|
config MTRR_SANITIZER
|
|
def_bool y
|
|
prompt "MTRR cleanup support"
|
|
depends on MTRR
|
|
help
|
|
Convert MTRR layout from continuous to discrete, so X drivers can
|
|
add writeback entries.
|
|
|
|
Can be disabled with disable_mtrr_cleanup on the kernel command line.
|
|
The largest mtrr entry size for a continous block can be set with
|
|
mtrr_chunk_size.
|
|
|
|
If unsure, say Y.
|
|
|
|
config MTRR_SANITIZER_ENABLE_DEFAULT
|
|
int "MTRR cleanup enable value (0-1)"
|
|
range 0 1
|
|
default "0"
|
|
depends on MTRR_SANITIZER
|
|
help
|
|
Enable mtrr cleanup default value
|
|
|
|
config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
|
|
int "MTRR cleanup spare reg num (0-7)"
|
|
range 0 7
|
|
default "1"
|
|
depends on MTRR_SANITIZER
|
|
help
|
|
mtrr cleanup spare entries default, it can be changed via
|
|
mtrr_spare_reg_nr=N on the kernel command line.
|
|
|
|
config X86_PAT
|
|
bool
|
|
prompt "x86 PAT support"
|
|
depends on MTRR
|
|
help
|
|
Use PAT attributes to setup page level cache control.
|
|
|
|
PATs are the modern equivalents of MTRRs and are much more
|
|
flexible than MTRRs.
|
|
|
|
Say N here if you see bootup problems (boot crash, boot hang,
|
|
spontaneous reboots) or a non-working video driver.
|
|
|
|
If unsure, say Y.
|
|
|
|
config EFI
|
|
bool "EFI runtime service support"
|
|
depends on ACPI
|
|
---help---
|
|
This enables the kernel to use EFI runtime services that are
|
|
available (such as the EFI variable services).
|
|
|
|
This option is only useful on systems that have EFI firmware.
|
|
In addition, you should use the latest ELILO loader available
|
|
at <http://elilo.sourceforge.net> in order to take advantage
|
|
of EFI runtime services. However, even with this option, the
|
|
resultant kernel should continue to boot on existing non-EFI
|
|
platforms.
|
|
|
|
config SECCOMP
|
|
def_bool y
|
|
prompt "Enable seccomp to safely compute untrusted bytecode"
|
|
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 prctl(PR_SET_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 && BROKEN
|
|
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"
|
|
depends on X86_BIOS_REBOOT
|
|
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"
|
|
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 KEXEC_JUMP
|
|
bool "kexec jump (EXPERIMENTAL)"
|
|
depends on EXPERIMENTAL
|
|
depends on KEXEC && HIBERNATION && X86_32
|
|
help
|
|
Jump between original kernel and kexeced kernel and invoke
|
|
code in physical address mode via KEXEC
|
|
|
|
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 hot-pluggable CPUs"
|
|
depends on SMP && HOTPLUG && !X86_VOYAGER
|
|
---help---
|
|
Say Y here to allow turning CPUs off and on. CPUs can be
|
|
controlled through /sys/devices/system/cpu.
|
|
( Note: power management support will enable this option
|
|
automatically on SMP systems. )
|
|
Say N if you want to disable CPU hotplug.
|
|
|
|
config COMPAT_VDSO
|
|
def_bool y
|
|
prompt "Compat VDSO support"
|
|
depends on X86_32 || IA32_EMULATION
|
|
help
|
|
Map the 32-bit 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.
|
|
|
|
config CMDLINE_BOOL
|
|
bool "Built-in kernel command line"
|
|
default n
|
|
help
|
|
Allow for specifying boot arguments to the kernel at
|
|
build time. On some systems (e.g. embedded ones), it is
|
|
necessary or convenient to provide some or all of the
|
|
kernel boot arguments with the kernel itself (that is,
|
|
to not rely on the boot loader to provide them.)
|
|
|
|
To compile command line arguments into the kernel,
|
|
set this option to 'Y', then fill in the
|
|
the boot arguments in CONFIG_CMDLINE.
|
|
|
|
Systems with fully functional boot loaders (i.e. non-embedded)
|
|
should leave this option set to 'N'.
|
|
|
|
config CMDLINE
|
|
string "Built-in kernel command string"
|
|
depends on CMDLINE_BOOL
|
|
default ""
|
|
help
|
|
Enter arguments here that should be compiled into the kernel
|
|
image and used at boot time. If the boot loader provides a
|
|
command line at boot time, it is appended to this string to
|
|
form the full kernel command line, when the system boots.
|
|
|
|
However, you can use the CONFIG_CMDLINE_OVERRIDE option to
|
|
change this behavior.
|
|
|
|
In most cases, the command line (whether built-in or provided
|
|
by the boot loader) should specify the device for the root
|
|
file system.
|
|
|
|
config CMDLINE_OVERRIDE
|
|
bool "Built-in command line overrides boot loader arguments"
|
|
default n
|
|
depends on CMDLINE_BOOL
|
|
help
|
|
Set this option to 'Y' to have the kernel ignore the boot loader
|
|
command line, and use ONLY the built-in command line.
|
|
|
|
This is used to work around broken boot loaders. This should
|
|
be set to 'N' under normal conditions.
|
|
|
|
endmenu
|
|
|
|
config ARCH_ENABLE_MEMORY_HOTPLUG
|
|
def_bool y
|
|
depends on X86_64 || (X86_32 && HIGHMEM)
|
|
|
|
config HAVE_ARCH_EARLY_PFN_TO_NID
|
|
def_bool X86_64
|
|
depends on NUMA
|
|
|
|
menu "Power management and ACPI options"
|
|
depends on !X86_VOYAGER
|
|
|
|
config ARCH_HIBERNATION_HEADER
|
|
def_bool y
|
|
depends on X86_64 && HIBERNATION
|
|
|
|
source "kernel/power/Kconfig"
|
|
|
|
source "drivers/acpi/Kconfig"
|
|
|
|
config X86_APM_BOOT
|
|
bool
|
|
default y
|
|
depends on APM || APM_MODULE
|
|
|
|
menuconfig APM
|
|
tristate "APM (Advanced Power Management) BIOS support"
|
|
depends on X86_32 && PM_SLEEP
|
|
---help---
|
|
APM is a BIOS specification for saving power using several different
|
|
techniques. This is mostly useful for battery powered laptops with
|
|
APM compliant BIOSes. If you say Y here, the system time will be
|
|
reset after a RESUME operation, the /proc/apm device will provide
|
|
battery status information, and user-space programs will receive
|
|
notification of APM "events" (e.g. battery status change).
|
|
|
|
If you select "Y" here, you can disable actual use of the APM
|
|
BIOS by passing the "apm=off" option to the kernel at boot time.
|
|
|
|
Note that the APM support is almost completely disabled for
|
|
machines with more than one CPU.
|
|
|
|
In order to use APM, you will need supporting software. For location
|
|
and more information, read <file:Documentation/power/pm.txt> and the
|
|
Battery Powered Linux mini-HOWTO, available from
|
|
<http://www.tldp.org/docs.html#howto>.
|
|
|
|
This driver does not spin down disk drives (see the hdparm(8)
|
|
manpage ("man 8 hdparm") for that), and it doesn't turn off
|
|
VESA-compliant "green" monitors.
|
|
|
|
This driver does not support the TI 4000M TravelMate and the ACER
|
|
486/DX4/75 because they don't have compliant BIOSes. Many "green"
|
|
desktop machines also don't have compliant BIOSes, and this driver
|
|
may cause those machines to panic during the boot phase.
|
|
|
|
Generally, if you don't have a battery in your machine, there isn't
|
|
much point in using this driver and you should say N. If you get
|
|
random kernel OOPSes or reboots that don't seem to be related to
|
|
anything, try disabling/enabling this option (or disabling/enabling
|
|
APM in your BIOS).
|
|
|
|
Some other things you should try when experiencing seemingly random,
|
|
"weird" problems:
|
|
|
|
1) make sure that you have enough swap space and that it is
|
|
enabled.
|
|
2) pass the "no-hlt" option to the kernel
|
|
3) switch on floating point emulation in the kernel and pass
|
|
the "no387" option to the kernel
|
|
4) pass the "floppy=nodma" option to the kernel
|
|
5) pass the "mem=4M" option to the kernel (thereby disabling
|
|
all but the first 4 MB of RAM)
|
|
6) make sure that the CPU is not over clocked.
|
|
7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
|
|
8) disable the cache from your BIOS settings
|
|
9) install a fan for the video card or exchange video RAM
|
|
10) install a better fan for the CPU
|
|
11) exchange RAM chips
|
|
12) exchange the motherboard.
|
|
|
|
To compile this driver as a module, choose M here: the
|
|
module will be called apm.
|
|
|
|
if APM
|
|
|
|
config APM_IGNORE_USER_SUSPEND
|
|
bool "Ignore USER SUSPEND"
|
|
help
|
|
This option will ignore USER SUSPEND requests. On machines with a
|
|
compliant APM BIOS, you want to say N. However, on the NEC Versa M
|
|
series notebooks, it is necessary to say Y because of a BIOS bug.
|
|
|
|
config APM_DO_ENABLE
|
|
bool "Enable PM at boot time"
|
|
---help---
|
|
Enable APM features at boot time. From page 36 of the APM BIOS
|
|
specification: "When disabled, the APM BIOS does not automatically
|
|
power manage devices, enter the Standby State, enter the Suspend
|
|
State, or take power saving steps in response to CPU Idle calls."
|
|
This driver will make CPU Idle calls when Linux is idle (unless this
|
|
feature is turned off -- see "Do CPU IDLE calls", below). This
|
|
should always save battery power, but more complicated APM features
|
|
will be dependent on your BIOS implementation. You may need to turn
|
|
this option off if your computer hangs at boot time when using APM
|
|
support, or if it beeps continuously instead of suspending. Turn
|
|
this off if you have a NEC UltraLite Versa 33/C or a Toshiba
|
|
T400CDT. This is off by default since most machines do fine without
|
|
this feature.
|
|
|
|
config APM_CPU_IDLE
|
|
bool "Make CPU Idle calls when idle"
|
|
help
|
|
Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
|
|
On some machines, this can activate improved power savings, such as
|
|
a slowed CPU clock rate, when the machine is idle. These idle calls
|
|
are made after the idle loop has run for some length of time (e.g.,
|
|
333 mS). On some machines, this will cause a hang at boot time or
|
|
whenever the CPU becomes idle. (On machines with more than one CPU,
|
|
this option does nothing.)
|
|
|
|
config APM_DISPLAY_BLANK
|
|
bool "Enable console blanking using APM"
|
|
help
|
|
Enable console blanking using the APM. Some laptops can use this to
|
|
turn off the LCD backlight when the screen blanker of the Linux
|
|
virtual console blanks the screen. Note that this is only used by
|
|
the virtual console screen blanker, and won't turn off the backlight
|
|
when using the X Window system. This also doesn't have anything to
|
|
do with your VESA-compliant power-saving monitor. Further, this
|
|
option doesn't work for all laptops -- it might not turn off your
|
|
backlight at all, or it might print a lot of errors to the console,
|
|
especially if you are using gpm.
|
|
|
|
config APM_ALLOW_INTS
|
|
bool "Allow interrupts during APM BIOS calls"
|
|
help
|
|
Normally we disable external interrupts while we are making calls to
|
|
the APM BIOS as a measure to lessen the effects of a badly behaving
|
|
BIOS implementation. The BIOS should reenable interrupts if it
|
|
needs to. Unfortunately, some BIOSes do not -- especially those in
|
|
many of the newer IBM Thinkpads. If you experience hangs when you
|
|
suspend, try setting this to Y. Otherwise, say N.
|
|
|
|
config APM_REAL_MODE_POWER_OFF
|
|
bool "Use real mode APM BIOS call to power off"
|
|
help
|
|
Use real mode APM BIOS calls to switch off the computer. This is
|
|
a work-around for a number of buggy BIOSes. Switch this option on if
|
|
your computer crashes instead of powering off properly.
|
|
|
|
endif # APM
|
|
|
|
source "arch/x86/kernel/cpu/cpufreq/Kconfig"
|
|
|
|
source "drivers/cpuidle/Kconfig"
|
|
|
|
source "drivers/idle/Kconfig"
|
|
|
|
endmenu
|
|
|
|
|
|
menu "Bus options (PCI etc.)"
|
|
|
|
config PCI
|
|
bool "PCI support"
|
|
default y
|
|
select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
|
|
help
|
|
Find out whether you have a PCI motherboard. PCI is the name of a
|
|
bus system, i.e. the way the CPU talks to the other stuff inside
|
|
your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
|
|
VESA. If you have PCI, say Y, otherwise N.
|
|
|
|
choice
|
|
prompt "PCI access mode"
|
|
depends on X86_32 && PCI
|
|
default PCI_GOANY
|
|
---help---
|
|
On PCI systems, the BIOS can be used to detect the PCI devices and
|
|
determine their configuration. However, some old PCI motherboards
|
|
have BIOS bugs and may crash if this is done. Also, some embedded
|
|
PCI-based systems don't have any BIOS at all. Linux can also try to
|
|
detect the PCI hardware directly without using the BIOS.
|
|
|
|
With this option, you can specify how Linux should detect the
|
|
PCI devices. If you choose "BIOS", the BIOS will be used,
|
|
if you choose "Direct", the BIOS won't be used, and if you
|
|
choose "MMConfig", then PCI Express MMCONFIG will be used.
|
|
If you choose "Any", the kernel will try MMCONFIG, then the
|
|
direct access method and falls back to the BIOS if that doesn't
|
|
work. If unsure, go with the default, which is "Any".
|
|
|
|
config PCI_GOBIOS
|
|
bool "BIOS"
|
|
|
|
config PCI_GOMMCONFIG
|
|
bool "MMConfig"
|
|
|
|
config PCI_GODIRECT
|
|
bool "Direct"
|
|
|
|
config PCI_GOOLPC
|
|
bool "OLPC"
|
|
depends on OLPC
|
|
|
|
config PCI_GOANY
|
|
bool "Any"
|
|
|
|
endchoice
|
|
|
|
config PCI_BIOS
|
|
def_bool y
|
|
depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
|
|
|
|
# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
|
|
config PCI_DIRECT
|
|
def_bool y
|
|
depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
|
|
|
|
config PCI_MMCONFIG
|
|
def_bool y
|
|
depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
|
|
|
|
config PCI_OLPC
|
|
def_bool y
|
|
depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
|
|
|
|
config PCI_DOMAINS
|
|
def_bool y
|
|
depends on PCI
|
|
|
|
config PCI_MMCONFIG
|
|
bool "Support mmconfig PCI config space access"
|
|
depends on X86_64 && PCI && ACPI
|
|
|
|
config DMAR
|
|
bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
|
|
depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
|
|
help
|
|
DMA remapping (DMAR) devices support enables independent address
|
|
translations for Direct Memory Access (DMA) from devices.
|
|
These DMA remapping devices are reported via ACPI tables
|
|
and include PCI device scope covered by these DMA
|
|
remapping devices.
|
|
|
|
config DMAR_GFX_WA
|
|
def_bool y
|
|
prompt "Support for Graphics workaround"
|
|
depends on DMAR
|
|
help
|
|
Current Graphics drivers tend to use physical address
|
|
for DMA and avoid using DMA APIs. Setting this config
|
|
option permits the IOMMU driver to set a unity map for
|
|
all the OS-visible memory. Hence the driver can continue
|
|
to use physical addresses for DMA.
|
|
|
|
config DMAR_FLOPPY_WA
|
|
def_bool y
|
|
depends on DMAR
|
|
help
|
|
Floppy disk drivers are know to bypass DMA API calls
|
|
thereby failing to work when IOMMU is enabled. This
|
|
workaround will setup a 1:1 mapping for the first
|
|
16M to make floppy (an ISA device) work.
|
|
|
|
config INTR_REMAP
|
|
bool "Support for Interrupt Remapping (EXPERIMENTAL)"
|
|
depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
|
|
help
|
|
Supports Interrupt remapping for IO-APIC and MSI devices.
|
|
To use x2apic mode in the CPU's which support x2APIC enhancements or
|
|
to support platforms with CPU's having > 8 bit APIC ID, say Y.
|
|
|
|
source "drivers/pci/pcie/Kconfig"
|
|
|
|
source "drivers/pci/Kconfig"
|
|
|
|
# x86_64 have no ISA slots, but do have ISA-style DMA.
|
|
config ISA_DMA_API
|
|
def_bool y
|
|
|
|
if X86_32
|
|
|
|
config ISA
|
|
bool "ISA support"
|
|
depends on !X86_VOYAGER
|
|
help
|
|
Find out whether you have ISA slots on your motherboard. ISA is the
|
|
name of a bus system, i.e. the way the CPU talks to the other stuff
|
|
inside your box. Other bus systems are PCI, EISA, MicroChannel
|
|
(MCA) or VESA. ISA is an older system, now being displaced by PCI;
|
|
newer boards don't support it. If you have ISA, say Y, otherwise N.
|
|
|
|
config EISA
|
|
bool "EISA support"
|
|
depends on ISA
|
|
---help---
|
|
The Extended Industry Standard Architecture (EISA) bus was
|
|
developed as an open alternative to the IBM MicroChannel bus.
|
|
|
|
The EISA bus provided some of the features of the IBM MicroChannel
|
|
bus while maintaining backward compatibility with cards made for
|
|
the older ISA bus. The EISA bus saw limited use between 1988 and
|
|
1995 when it was made obsolete by the PCI bus.
|
|
|
|
Say Y here if you are building a kernel for an EISA-based machine.
|
|
|
|
Otherwise, say N.
|
|
|
|
source "drivers/eisa/Kconfig"
|
|
|
|
config MCA
|
|
bool "MCA support" if !X86_VOYAGER
|
|
default y if X86_VOYAGER
|
|
help
|
|
MicroChannel Architecture is found in some IBM PS/2 machines and
|
|
laptops. It is a bus system similar to PCI or ISA. See
|
|
<file:Documentation/mca.txt> (and especially the web page given
|
|
there) before attempting to build an MCA bus kernel.
|
|
|
|
source "drivers/mca/Kconfig"
|
|
|
|
config SCx200
|
|
tristate "NatSemi SCx200 support"
|
|
depends on !X86_VOYAGER
|
|
help
|
|
This provides basic support for National Semiconductor's
|
|
(now AMD's) Geode processors. The driver probes for the
|
|
PCI-IDs of several on-chip devices, so its a good dependency
|
|
for other scx200_* drivers.
|
|
|
|
If compiled as a module, the driver is named scx200.
|
|
|
|
config SCx200HR_TIMER
|
|
tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
|
|
depends on SCx200 && GENERIC_TIME
|
|
default y
|
|
help
|
|
This driver provides a clocksource built upon the on-chip
|
|
27MHz high-resolution timer. Its also a workaround for
|
|
NSC Geode SC-1100's buggy TSC, which loses time when the
|
|
processor goes idle (as is done by the scheduler). The
|
|
other workaround is idle=poll boot option.
|
|
|
|
config GEODE_MFGPT_TIMER
|
|
def_bool y
|
|
prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
|
|
depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
|
|
help
|
|
This driver provides a clock event source based on the MFGPT
|
|
timer(s) in the CS5535 and CS5536 companion chip for the geode.
|
|
MFGPTs have a better resolution and max interval than the
|
|
generic PIT, and are suitable for use as high-res timers.
|
|
|
|
config OLPC
|
|
bool "One Laptop Per Child support"
|
|
default n
|
|
help
|
|
Add support for detecting the unique features of the OLPC
|
|
XO hardware.
|
|
|
|
endif # X86_32
|
|
|
|
config K8_NB
|
|
def_bool y
|
|
depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
|
|
|
|
source "drivers/pcmcia/Kconfig"
|
|
|
|
source "drivers/pci/hotplug/Kconfig"
|
|
|
|
endmenu
|
|
|
|
|
|
menu "Executable file formats / Emulations"
|
|
|
|
source "fs/Kconfig.binfmt"
|
|
|
|
config IA32_EMULATION
|
|
bool "IA32 Emulation"
|
|
depends on X86_64
|
|
select COMPAT_BINFMT_ELF
|
|
help
|
|
Include code to run 32-bit programs under a 64-bit kernel. You should
|
|
likely turn this on, unless you're 100% sure that you don't have any
|
|
32-bit programs left.
|
|
|
|
config IA32_AOUT
|
|
tristate "IA32 a.out support"
|
|
depends on IA32_EMULATION
|
|
help
|
|
Support old a.out binaries in the 32bit emulation.
|
|
|
|
config COMPAT
|
|
def_bool y
|
|
depends on IA32_EMULATION
|
|
|
|
config COMPAT_FOR_U64_ALIGNMENT
|
|
def_bool COMPAT
|
|
depends on X86_64
|
|
|
|
config SYSVIPC_COMPAT
|
|
def_bool y
|
|
depends on COMPAT && SYSVIPC
|
|
|
|
endmenu
|
|
|
|
|
|
config HAVE_ATOMIC_IOMAP
|
|
def_bool y
|
|
depends on X86_32
|
|
|
|
source "net/Kconfig"
|
|
|
|
source "drivers/Kconfig"
|
|
|
|
source "drivers/firmware/Kconfig"
|
|
|
|
source "fs/Kconfig"
|
|
|
|
source "arch/x86/Kconfig.debug"
|
|
|
|
source "security/Kconfig"
|
|
|
|
source "crypto/Kconfig"
|
|
|
|
source "arch/x86/kvm/Kconfig"
|
|
|
|
source "lib/Kconfig"
|