xref: /openbmc/linux/arch/x86/um/Kconfig (revision 023e4163)
1# SPDX-License-Identifier: GPL-2.0
2
3menu "Host processor type and features"
4
5source "arch/x86/Kconfig.cpu"
6
7endmenu
8
9config UML_X86
10	def_bool y
11	select GENERIC_FIND_FIRST_BIT
12
13config 64BIT
14	bool "64-bit kernel" if "$(SUBARCH)" = "x86"
15	default "$(SUBARCH)" != "i386"
16
17config X86_32
18	def_bool !64BIT
19	select ARCH_32BIT_OFF_T
20	select ARCH_WANT_IPC_PARSE_VERSION
21	select MODULES_USE_ELF_REL
22	select CLONE_BACKWARDS
23	select OLD_SIGSUSPEND3
24	select OLD_SIGACTION
25
26config X86_64
27	def_bool 64BIT
28	select MODULES_USE_ELF_RELA
29
30config ARCH_DEFCONFIG
31	string
32	default "arch/um/configs/i386_defconfig" if X86_32
33	default "arch/um/configs/x86_64_defconfig" if X86_64
34
35config RWSEM_XCHGADD_ALGORITHM
36	def_bool 64BIT
37
38config RWSEM_GENERIC_SPINLOCK
39	def_bool !RWSEM_XCHGADD_ALGORITHM
40
41config 3_LEVEL_PGTABLES
42	bool "Three-level pagetables" if !64BIT
43	default 64BIT
44	help
45	Three-level pagetables will let UML have more than 4G of physical
46	memory.  All the memory that can't be mapped directly will be treated
47	as high memory.
48
49	However, this it experimental on 32-bit architectures, so if unsure say
50	N (on x86-64 it's automatically enabled, instead, as it's safe there).
51
52config ARCH_HAS_SC_SIGNALS
53	def_bool !64BIT
54
55config ARCH_REUSE_HOST_VSYSCALL_AREA
56	def_bool !64BIT
57
58config GENERIC_HWEIGHT
59	def_bool y
60