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 3_LEVEL_PGTABLES
36	bool "Three-level pagetables" if !64BIT
37	default 64BIT
38	help
39	Three-level pagetables will let UML have more than 4G of physical
40	memory.  All the memory that can't be mapped directly will be treated
41	as high memory.
42
43	However, this it experimental on 32-bit architectures, so if unsure say
44	N (on x86-64 it's automatically enabled, instead, as it's safe there).
45
46config ARCH_HAS_SC_SIGNALS
47	def_bool !64BIT
48
49config ARCH_REUSE_HOST_VSYSCALL_AREA
50	def_bool !64BIT
51
52config GENERIC_HWEIGHT
53	def_bool y