| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | |
| 3 | menu "Host processor type and features" |
| 4 | |
| 5 | source "arch/x86/Kconfig.cpu" |
| 6 | |
| 7 | endmenu |
| 8 | |
| 9 | config UML_X86 |
| 10 | def_bool y |
| 11 | select GENERIC_FIND_FIRST_BIT |
| 12 | |
| 13 | config 64BIT |
| 14 | bool "64-bit kernel" if "$(SUBARCH)" = "x86" |
| 15 | default "$(SUBARCH)" != "i386" |
| 16 | |
| 17 | config 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 | |
| 26 | config X86_64 |
| 27 | def_bool 64BIT |
| 28 | select MODULES_USE_ELF_RELA |
| 29 | |
| 30 | config 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 | |
| 35 | config RWSEM_XCHGADD_ALGORITHM |
| 36 | def_bool 64BIT |
| 37 | |
| 38 | config RWSEM_GENERIC_SPINLOCK |
| 39 | def_bool !RWSEM_XCHGADD_ALGORITHM |
| 40 | |
| 41 | config 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 | |
| 52 | config ARCH_HAS_SC_SIGNALS |
| 53 | def_bool !64BIT |
| 54 | |
| 55 | config ARCH_REUSE_HOST_VSYSCALL_AREA |
| 56 | def_bool !64BIT |
| 57 | |
| 58 | config GENERIC_HWEIGHT |
| 59 | def_bool y |