arch/x86/um/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 mainmenu "User Mode Linux/$(SUBARCH) $(KERNELVERSION) Kernel Configuration"
   3
   4 comment "Compiler: $(CC_VERSION_TEXT)"
   5
   6 source "arch/um/Kconfig.common"
   7
   8 menu "UML-specific options"
   9
  10 menu "Host processor type and features"
  11
  12 source "arch/x86/Kconfig.cpu"
  13
  14 endmenu
  15
  16 config UML_X86
  17         def_bool y
  18         select GENERIC_FIND_FIRST_BIT
  19
  20 config 64BIT
  21         bool "64-bit kernel" if "$(SUBARCH)" = "x86"
  22         default "$(SUBARCH)" != "i386"
  23
  24 config X86_32
  25         def_bool !64BIT
  26         select HAVE_AOUT
  27         select ARCH_WANT_IPC_PARSE_VERSION
  28         select MODULES_USE_ELF_REL
  29         select CLONE_BACKWARDS
  30         select OLD_SIGSUSPEND3
  31         select OLD_SIGACTION
  32
  33 config X86_64
  34         def_bool 64BIT
  35         select MODULES_USE_ELF_RELA
  36
  37 config ARCH_DEFCONFIG
  38         string
  39         default "arch/um/configs/i386_defconfig" if X86_32
  40         default "arch/um/configs/x86_64_defconfig" if X86_64
  41
  42 config RWSEM_XCHGADD_ALGORITHM
  43         def_bool 64BIT
  44
  45 config RWSEM_GENERIC_SPINLOCK
  46         def_bool !RWSEM_XCHGADD_ALGORITHM
  47
  48 config 3_LEVEL_PGTABLES
  49         bool "Three-level pagetables" if !64BIT
  50         default 64BIT
  51         help
  52         Three-level pagetables will let UML have more than 4G of physical
  53         memory.  All the memory that can't be mapped directly will be treated
  54         as high memory.
  55
  56         However, this it experimental on 32-bit architectures, so if unsure say
  57         N (on x86-64 it's automatically enabled, instead, as it's safe there).
  58
  59 config ARCH_HAS_SC_SIGNALS
  60         def_bool !64BIT
  61
  62 config ARCH_REUSE_HOST_VSYSCALL_AREA
  63         def_bool !64BIT
  64
  65 config GENERIC_HWEIGHT
  66         def_bool y
  67
  68 source "arch/um/Kconfig.um"
  69
  70 endmenu
  71
  72 source "arch/um/Kconfig.rest"