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 0xc0000000 if !HOST_2G_2G
- default 0x80000000 if HOST_2G_2G
+ 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"
+ 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
+ default 0xbfffe000 if !HOST_VMSPLIT_2G
+ default 0x7fffe000 if HOST_VMSPLIT_2G
config STUB_DATA
hex
- default 0xbffff000
+ default 0xbffff000 if !HOST_VMSPLIT_2G
+ default 0x7ffff000 if HOST_VMSPLIT_2G
config STUB_START
hex
config ARCH_REUSE_HOST_VSYSCALL_AREA
bool
default y
+
+config GENERIC_HWEIGHT
+ bool
+ default y
+