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_VMSPLIT_2G default 0x7fffe000 if HOST_VMSPLIT_2G config STUB_DATA hex default 0xbffff000 if !HOST_VMSPLIT_2G default 0x7ffff000 if HOST_VMSPLIT_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