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_WANT_IPC_PARSE_VERSION 20 select MODULES_USE_ELF_REL 21 select CLONE_BACKWARDS 22 select OLD_SIGSUSPEND3 23 select OLD_SIGACTION 24 25config X86_64 26 def_bool 64BIT 27 select MODULES_USE_ELF_RELA 28 29config ARCH_DEFCONFIG 30 string 31 default "arch/um/configs/i386_defconfig" if X86_32 32 default "arch/um/configs/x86_64_defconfig" if X86_64 33 34config RWSEM_XCHGADD_ALGORITHM 35 def_bool 64BIT 36 37config RWSEM_GENERIC_SPINLOCK 38 def_bool !RWSEM_XCHGADD_ALGORITHM 39 40config 3_LEVEL_PGTABLES 41 bool "Three-level pagetables" if !64BIT 42 default 64BIT 43 help 44 Three-level pagetables will let UML have more than 4G of physical 45 memory. All the memory that can't be mapped directly will be treated 46 as high memory. 47 48 However, this it experimental on 32-bit architectures, so if unsure say 49 N (on x86-64 it's automatically enabled, instead, as it's safe there). 50 51config ARCH_HAS_SC_SIGNALS 52 def_bool !64BIT 53 54config ARCH_REUSE_HOST_VSYSCALL_AREA 55 def_bool !64BIT 56 57config GENERIC_HWEIGHT 58 def_bool y 59