1 menu "Host processor type and features"
3 source "arch/x86/Kconfig.cpu"
15 config RWSEM_XCHGADD_ALGORITHM
22 config SEMAPHORE_SLEEPERS
27 prompt "Host memory split"
28 default HOST_VMSPLIT_3G
30 This is needed when the host kernel on which you run has a non-default
31 (like 2G/2G) memory split, instead of the customary 3G/1G. If you did
32 not recompile your own kernel but use the default distro's one, you can
33 safely accept the "Default split" option.
35 It can be enabled on recent (>=2.6.16-rc2) vanilla kernels via
36 CONFIG_VM_SPLIT_*, or on previous kernels with special patches (-ck
37 patchset by Con Kolivas, or other ones) - option names match closely the
38 host CONFIG_VM_SPLIT_* ones.
40 A lower setting (where 1G/3G is lowest and 3G/1G is higher) will
41 tolerate even more "normal" host kernels, but an higher setting will be
44 So, if you do not know what to do here, say 'Default split'.
46 config HOST_VMSPLIT_3G
47 bool "Default split (3G/1G user/kernel host split)"
48 config HOST_VMSPLIT_3G_OPT
49 bool "3G/1G user/kernel host split (for full 1G low memory)"
50 config HOST_VMSPLIT_2G
51 bool "2G/2G user/kernel host split"
52 config HOST_VMSPLIT_1G
53 bool "1G/3G user/kernel host split"
58 default 0xB0000000 if HOST_VMSPLIT_3G_OPT
59 default 0x78000000 if HOST_VMSPLIT_2G
60 default 0x40000000 if HOST_VMSPLIT_1G
63 config 3_LEVEL_PGTABLES
64 bool "Three-level pagetables (EXPERIMENTAL)"
66 depends on EXPERIMENTAL
68 Three-level pagetables will let UML have more than 4G of physical
69 memory. All the memory that can't be mapped directly will be treated
72 However, this it experimental on 32-bit architectures, so if unsure say
73 N (on x86-64 it's automatically enabled, instead, as it's safe there).
75 config ARCH_HAS_SC_SIGNALS
79 config ARCH_REUSE_HOST_VSYSCALL_AREA
83 config GENERIC_HWEIGHT