1 # SPDX-License-Identifier: GPL-2.0
3 menu "Host processor type and features"
5 source "arch/x86/Kconfig.cpu"
11 select GENERIC_FIND_FIRST_BIT
14 bool "64-bit kernel" if "$(SUBARCH)" = "x86"
15 default "$(SUBARCH)" != "i386"
20 select ARCH_WANT_IPC_PARSE_VERSION
21 select MODULES_USE_ELF_REL
22 select CLONE_BACKWARDS
23 select OLD_SIGSUSPEND3
28 select MODULES_USE_ELF_RELA
32 default "arch/um/configs/i386_defconfig" if X86_32
33 default "arch/um/configs/x86_64_defconfig" if X86_64
35 config RWSEM_XCHGADD_ALGORITHM
38 config RWSEM_GENERIC_SPINLOCK
39 def_bool !RWSEM_XCHGADD_ALGORITHM
41 config 3_LEVEL_PGTABLES
42 bool "Three-level pagetables" if !64BIT
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
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).
52 config ARCH_HAS_SC_SIGNALS
55 config ARCH_REUSE_HOST_VSYSCALL_AREA
58 config GENERIC_HWEIGHT