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Kconfig.i386
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Kconfig.i386
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menu "Host processor type and features"
source "arch/x86/Kconfig.cpu"
endmenu
config UML_X86
bool
default y
config X86_32
bool
default y
config RWSEM_XCHGADD_ALGORITHM
def_bool y
config 64BIT
bool
default n
config SEMAPHORE_SLEEPERS
bool
default y
choice
prompt "Host memory split"
default HOST_VMSPLIT_3G
help
This is needed when the host kernel on which you run has a non-default
(like 2G/2G) memory split, instead of the customary 3G/1G. If you did
not recompile your own kernel but use the default distro's one, you can
safely accept the "Default split" option.
It can be enabled on recent (>=2.6.16-rc2) vanilla kernels via
CONFIG_VM_SPLIT_*, or on previous kernels with special patches (-ck
patchset by Con Kolivas, or other ones) - option names match closely the
host CONFIG_VM_SPLIT_* ones.
A lower setting (where 1G/3G is lowest and 3G/1G is higher) will
tolerate even more "normal" host kernels, but an higher setting will be
stricter.
So, if you do not know what to do here, say 'Default split'.
config HOST_VMSPLIT_3G
bool "Default split (3G/1G user/kernel host split)"
config HOST_VMSPLIT_3G_OPT
bool "3G/1G user/kernel host split (for full 1G low memory)"
config HOST_VMSPLIT_2G
bool "2G/2G user/kernel host split"
config HOST_VMSPLIT_1G
bool "1G/3G user/kernel host split"
endchoice
config TOP_ADDR
hex
default 0xB0000000 if HOST_VMSPLIT_3G_OPT
default 0x78000000 if HOST_VMSPLIT_2G
default 0x40000000 if HOST_VMSPLIT_1G
default 0xC0000000
config 3_LEVEL_PGTABLES
bool "Three-level pagetables (EXPERIMENTAL)"
default n
depends on EXPERIMENTAL
help
Three-level pagetables will let UML have more than 4G of physical
memory. All the memory that can't be mapped directly will be treated
as high memory.
However, this it experimental on 32-bit architectures, so if unsure say
N (on x86-64 it's automatically enabled, instead, as it's safe there).
config ARCH_HAS_SC_SIGNALS
bool
default y
config ARCH_REUSE_HOST_VSYSCALL_AREA
bool
default y
config GENERIC_HWEIGHT
bool
default y