arch/x86/um/Kconfig

   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 ARCH_32BIT_OFF_T
  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 3_LEVEL_PGTABLES
  36         bool "Three-level pagetables" if !64BIT
  37         default 64BIT
  38         help
  39         Three-level pagetables will let UML have more than 4G of physical
  40         memory.  All the memory that can't be mapped directly will be treated
  41         as high memory.
  42
  43         However, this it experimental on 32-bit architectures, so if unsure say
  44         N (on x86-64 it's automatically enabled, instead, as it's safe there).
  45
  46 config ARCH_HAS_SC_SIGNALS
  47         def_bool !64BIT
  48
  49 config ARCH_REUSE_HOST_VSYSCALL_AREA
  50         def_bool !64BIT
  51
  52 config GENERIC_HWEIGHT
  53         def_bool y