tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1menu "Host processor type and features"
2
3source "arch/i386/Kconfig.cpu"
4
5endmenu
6
7config UML_X86
8 bool
9 default y
10
11config 64BIT
12 bool
13 default n
14
15config SEMAPHORE_SLEEPERS
16 bool
17 default y
18
19choice
20 prompt "Host memory split"
21 default HOST_VMSPLIT_3G
22 help
23 This is needed when the host kernel on which you run has a non-default
24 (like 2G/2G) memory split, instead of the customary 3G/1G. If you did
25 not recompile your own kernel but use the default distro's one, you can
26 safely accept the "Default split" option.
27
28 It can be enabled on recent (>=2.6.16-rc2) vanilla kernels via
29 CONFIG_VM_SPLIT_*, or on previous kernels with special patches (-ck
30 patchset by Con Kolivas, or other ones) - option names match closely the
31 host CONFIG_VM_SPLIT_* ones.
32
33 A lower setting (where 1G/3G is lowest and 3G/1G is higher) will
34 tolerate even more "normal" host kernels, but an higher setting will be
35 stricter.
36
37 So, if you do not know what to do here, say 'Default split'.
38
39config HOST_VMSPLIT_3G
40 bool "Default split (3G/1G user/kernel host split)"
41config HOST_VMSPLIT_3G_OPT
42 bool "3G/1G user/kernel host split (for full 1G low memory)"
43config HOST_VMSPLIT_2G
44 bool "2G/2G user/kernel host split"
45config HOST_VMSPLIT_1G
46 bool "1G/3G user/kernel host split"
47endchoice
48
49config TOP_ADDR
50 hex
51 default 0xB0000000 if HOST_VMSPLIT_3G_OPT
52 default 0x78000000 if HOST_VMSPLIT_2G
53 default 0x40000000 if HOST_VMSPLIT_1G
54 default 0xC0000000
55
56config 3_LEVEL_PGTABLES
57 bool "Three-level pagetables (EXPERIMENTAL)"
58 default n
59 depends on EXPERIMENTAL
60 help
61 Three-level pagetables will let UML have more than 4G of physical
62 memory. All the memory that can't be mapped directly will be treated
63 as high memory.
64
65 However, this it experimental on 32-bit architectures, so if unsure say
66 N (on x86-64 it's automatically enabled, instead, as it's safe there).
67
68config STUB_CODE
69 hex
70 default 0xbfffe000 if !HOST_VMSPLIT_2G
71 default 0x7fffe000 if HOST_VMSPLIT_2G
72
73config STUB_DATA
74 hex
75 default 0xbffff000 if !HOST_VMSPLIT_2G
76 default 0x7ffff000 if HOST_VMSPLIT_2G
77
78config STUB_START
79 hex
80 default STUB_CODE
81
82config ARCH_HAS_SC_SIGNALS
83 bool
84 default y
85
86config ARCH_REUSE_HOST_VSYSCALL_AREA
87 bool
88 default y
89
90config GENERIC_HWEIGHT
91 bool
92 default y
93