arch/x86/um/Kconfig

# SPDX-License-Identifier: GPL-2.0

menu "Host processor type and features"

source "arch/x86/Kconfig.cpu"

endmenu

config UML_X86
	def_bool y
	select GENERIC_FIND_FIRST_BIT

config 64BIT
	bool "64-bit kernel" if "$(SUBARCH)" = "x86"
	default "$(SUBARCH)" != "i386"

config X86_32
	def_bool !64BIT
	select HAVE_AOUT
	select ARCH_WANT_IPC_PARSE_VERSION
	select MODULES_USE_ELF_REL
	select CLONE_BACKWARDS
	select OLD_SIGSUSPEND3
	select OLD_SIGACTION

config X86_64
	def_bool 64BIT
	select MODULES_USE_ELF_RELA

config ARCH_DEFCONFIG
	string
	default "arch/um/configs/i386_defconfig" if X86_32
	default "arch/um/configs/x86_64_defconfig" if X86_64

config RWSEM_XCHGADD_ALGORITHM
	def_bool 64BIT

config RWSEM_GENERIC_SPINLOCK
	def_bool !RWSEM_XCHGADD_ALGORITHM

config 3_LEVEL_PGTABLES
	bool "Three-level pagetables" if !64BIT
	default 64BIT
	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 ARCH_HAS_SC_SIGNALS
	def_bool !64BIT

config ARCH_REUSE_HOST_VSYSCALL_AREA
	def_bool !64BIT

config GENERIC_HWEIGHT
	def_bool y