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 HAVE_AOUT 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