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|
#
# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
#
# Note: ISA is disabled and will hopefully never be enabled.
# If you managed to buy an ISA x86-64 box you'll have to fix all the
# ISA drivers you need yourself.
#
mainmenu "Linux Kernel Configuration"
config X86_64
bool
default y
help
Port to the x86-64 architecture. x86-64 is a 64-bit extension to the
classical 32-bit x86 architecture. For details see
<http://www.x86-64.org/>.
config 64BIT
def_bool y
config X86
bool
default y
config ZONE_DMA32
bool
default y
config LOCKDEP_SUPPORT
bool
default y
config STACKTRACE_SUPPORT
bool
default y
config SEMAPHORE_SLEEPERS
bool
default y
config MMU
bool
default y
config ISA
bool
config SBUS
bool
config RWSEM_GENERIC_SPINLOCK
bool
default y
config RWSEM_XCHGADD_ALGORITHM
bool
config GENERIC_HWEIGHT
bool
default y
config GENERIC_CALIBRATE_DELAY
bool
default y
config X86_CMPXCHG
bool
default y
config EARLY_PRINTK
bool
default y
config GENERIC_ISA_DMA
bool
default y
config GENERIC_IOMAP
bool
default y
config ARCH_MAY_HAVE_PC_FDC
bool
default y
config ARCH_POPULATES_NODE_MAP
def_bool y
config DMI
bool
default y
config AUDIT_ARCH
bool
default y
config GENERIC_BUG
bool
default y
depends on BUG
config ARCH_HAS_ILOG2_U32
bool
default n
config ARCH_HAS_ILOG2_U64
bool
default n
source "init/Kconfig"
menu "Processor type and features"
choice
prompt "Subarchitecture Type"
default X86_PC
config X86_PC
bool "PC-compatible"
help
Choose this option if your computer is a standard PC or compatible.
config X86_VSMP
bool "Support for ScaleMP vSMP"
depends on 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
choice
prompt "Processor family"
default GENERIC_CPU
config MK8
bool "AMD-Opteron/Athlon64"
help
Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
config MPSC
bool "Intel P4 / older Netburst based Xeon"
help
Optimize for Intel Pentium 4 and older Nocona/Dempsey Xeon CPUs
with Intel Extended Memory 64 Technology(EM64T). For details see
<http://www.intel.com/technology/64bitextensions/>.
Note the the latest Xeons (Xeon 51xx and 53xx) are not based on the
Netburst core and shouldn't use this option. You can distingush them
using the cpu family field
in /proc/cpuinfo. Family 15 is a older Xeon, Family 6 a newer one
(this rule only applies to system that support EM64T)
config MCORE2
bool "Intel Core2 / newer Xeon"
help
Optimize for Intel Core2 and newer Xeons (51xx)
You can distingush the newer Xeons from the older ones using
the cpu family field in /proc/cpuinfo. 15 is a older Xeon
(use CONFIG_MPSC then), 6 is a newer one. This rule only
applies to CPUs that support EM64T.
config GENERIC_CPU
bool "Generic-x86-64"
help
Generic x86-64 CPU.
Run equally well on all x86-64 CPUs.
endchoice
#
# Define implied options from the CPU selection here
#
config X86_L1_CACHE_BYTES
int
default "128" if GENERIC_CPU || MPSC
default "64" if MK8 || MCORE2
config X86_L1_CACHE_SHIFT
int
default "7" if GENERIC_CPU || MPSC
default "6" if MK8 || MCORE2
config X86_INTERNODE_CACHE_BYTES
int
default "4096" if X86_VSMP
default X86_L1_CACHE_BYTES if !X86_VSMP
config X86_TSC
bool
default y
config X86_GOOD_APIC
bool
default y
config MICROCODE
tristate "/dev/cpu/microcode - Intel CPU microcode support"
select FW_LOADER
---help---
If you say Y here the 'File systems' section, you will be
able to update the microcode on Intel processors. You will
obviously need the actual microcode binary data itself which is
not shipped with the Linux kernel.
For latest news and information on obtaining all the required
ingredients for this driver, check:
<http://www.urbanmyth.org/microcode/>.
To compile this driver as a module, choose M here: the
module will be called microcode.
If you use modprobe or kmod you may also want to add the line
'alias char-major-10-184 microcode' to your /etc/modules.conf file.
config MICROCODE_OLD_INTERFACE
bool
depends on MICROCODE
default y
config X86_MSR
tristate "/dev/cpu/*/msr - Model-specific register support"
help
This device gives privileged processes access to the x86
Model-Specific Registers (MSRs). It is a character device with
major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
MSR accesses are directed to a specific CPU on multi-processor
systems.
config X86_CPUID
tristate "/dev/cpu/*/cpuid - CPU information support"
help
This device gives processes access to the x86 CPUID instruction to
be executed on a specific processor. It is a character device
with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
/dev/cpu/31/cpuid.
config X86_HT
bool
depends on SMP && !MK8
default y
config MATH_EMULATION
bool
config MCA
bool
config EISA
bool
config X86_IO_APIC
bool
default y
config X86_LOCAL_APIC
bool
default y
config MTRR
bool "MTRR (Memory Type Range Register) support"
---help---
On Intel P6 family processors (Pentium Pro, Pentium II and later)
the Memory Type Range Registers (MTRRs) may be used to control
processor access to memory ranges. This is most useful if you have
a video (VGA) card on a PCI or AGP bus. Enabling write-combining
allows bus write transfers to be combined into a larger transfer
before bursting over the PCI/AGP bus. This can increase performance
of image write operations 2.5 times or more. Saying Y here creates a
/proc/mtrr file which may be used to manipulate your processor's
MTRRs. Typically the X server should use this.
This code has a reasonably generic interface so that similar
control registers on other processors can be easily supported
as well.
Saying Y here also fixes a problem with buggy SMP BIOSes which only
set the MTRRs for the boot CPU and not for the secondary CPUs. This
can lead to all sorts of problems, so it's good to say Y here.
Just say Y here, all x86-64 machines support MTRRs.
See <file:Documentation/mtrr.txt> for more information.
config SMP
bool "Symmetric multi-processing support"
---help---
This enables support for systems with more than one CPU. If you have
a system with only one CPU, like most personal computers, say N. If
you have a system with more than one CPU, say Y.
If you say N here, the kernel will run on single and multiprocessor
machines, but will use only one CPU of a multiprocessor machine. If
you say Y here, the kernel will run on many, but not all,
singleprocessor machines. On a singleprocessor machine, the kernel
will run faster if you say N here.
If you don't know what to do here, say N.
config SCHED_SMT
bool "SMT (Hyperthreading) scheduler support"
depends on SMP
default n
help
SMT scheduler support improves the CPU scheduler's decision making
when dealing with Intel Pentium 4 chips with HyperThreading at a
cost of slightly increased overhead in some places. If unsure say
N here.
config SCHED_MC
bool "Multi-core scheduler support"
depends on SMP
default y
help
Multi-core scheduler support improves the CPU scheduler's decision
making when dealing with multi-core CPU chips at a cost of slightly
increased overhead in some places. If unsure say N here.
source "kernel/Kconfig.preempt"
config NUMA
bool "Non Uniform Memory Access (NUMA) Support"
depends on SMP
help
Enable NUMA (Non Uniform Memory Access) support. The kernel
will try to allocate memory used by a CPU on the local memory
controller of the CPU and add some more NUMA awareness to the kernel.
This code is recommended on all multiprocessor Opteron systems.
If the system is EM64T, you should say N unless your system is EM64T
NUMA.
config K8_NUMA
bool "Old style AMD Opteron NUMA detection"
depends on NUMA && PCI
default y
help
Enable K8 NUMA node topology detection. You should say Y here if
you have a multi processor AMD K8 system. This uses an old
method to read the NUMA configuration directly from the builtin
Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
instead, which also takes priority if both are compiled in.
config NODES_SHIFT
int
default "6"
depends on NEED_MULTIPLE_NODES
# Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
config X86_64_ACPI_NUMA
bool "ACPI NUMA detection"
depends on NUMA
select ACPI
select PCI
select ACPI_NUMA
default y
help
Enable ACPI SRAT based node topology detection.
config NUMA_EMU
bool "NUMA emulation"
depends on NUMA
help
Enable NUMA emulation. A flat machine will be split
into virtual nodes when booted with "numa=fake=N", where N is the
number of nodes. This is only useful for debugging.
config ARCH_DISCONTIGMEM_ENABLE
bool
depends on NUMA
default y
config ARCH_DISCONTIGMEM_DEFAULT
def_bool y
depends on NUMA
config ARCH_SPARSEMEM_ENABLE
def_bool y
depends on (NUMA || EXPERIMENTAL)
config ARCH_MEMORY_PROBE
def_bool y
depends on MEMORY_HOTPLUG
config ARCH_FLATMEM_ENABLE
def_bool y
depends on !NUMA
source "mm/Kconfig"
config MEMORY_HOTPLUG_RESERVE
def_bool y
depends on (MEMORY_HOTPLUG && DISCONTIGMEM)
config HAVE_ARCH_EARLY_PFN_TO_NID
def_bool y
depends on NUMA
config OUT_OF_LINE_PFN_TO_PAGE
def_bool y
depends on DISCONTIGMEM
config NR_CPUS
int "Maximum number of CPUs (2-256)"
range 2 255
depends on SMP
default "8"
help
This allows you to specify the maximum number of CPUs which this
kernel will support. Current maximum is 256 CPUs due to
APIC addressing limits. Less depending on the hardware.
This is purely to save memory - each supported CPU requires
memory in the static kernel configuration.
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
depends on SMP && HOTPLUG && EXPERIMENTAL
help
Say Y here to experiment with turning CPUs off and on. CPUs
can be controlled through /sys/devices/system/cpu/cpu#.
Say N if you want to disable CPU hotplug.
config ARCH_ENABLE_MEMORY_HOTPLUG
def_bool y
config HPET_TIMER
bool
default y
help
Use the IA-PC HPET (High Precision Event Timer) to manage
time in preference to the PIT and RTC, if a HPET is
present. The HPET provides a stable time base on SMP
systems, unlike the TSC, but it is more expensive to access,
as it is off-chip. You can find the HPET spec at
<http://www.intel.com/hardwaredesign/hpetspec.htm>.
config HPET_EMULATE_RTC
bool "Provide RTC interrupt"
depends on HPET_TIMER && RTC=y
# Mark as embedded because too many people got it wrong.
# The code disables itself when not needed.
config IOMMU
bool "IOMMU support" if EMBEDDED
default y
select SWIOTLB
select AGP
depends on 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 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 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
|