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- menu "Host processor type and features"
- source "arch/i386/Kconfig.cpu"
- endmenu
- config UML_X86
- bool
- default 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 STUB_CODE
- hex
- default 0xbfffe000 if !HOST_2G_2G
- default 0x7fffe000 if HOST_2G_2G
- config STUB_DATA
- hex
- default 0xbffff000 if !HOST_2G_2G
- default 0x7ffff000 if HOST_2G_2G
- config STUB_START
- hex
- default STUB_CODE
- config ARCH_HAS_SC_SIGNALS
- bool
- default y
- config ARCH_REUSE_HOST_VSYSCALL_AREA
- bool
- default y
- config GENERIC_HWEIGHT
- bool
- default y
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