arch/um/Kconfig.x86

   1 source "arch/um/Kconfig.common"
   2
   3 menu "UML-specific options"
   4
   5 menu "Host processor type and features"
   6
   7 config CMPXCHG_LOCAL
   8         bool
   9         default n
  10
  11 source "arch/x86/Kconfig.cpu"
  12
  13 endmenu
  14
  15 config UML_X86
  16         def_bool y
  17         select GENERIC_FIND_FIRST_BIT
  18
  19 config 64BIT
  20         bool
  21         default SUBARCH = "x86_64"
  22
  23 config X86_32
  24         def_bool !64BIT
  25         select HAVE_AOUT
  26
  27 config X86_64
  28         def_bool 64BIT
  29
  30 config RWSEM_XCHGADD_ALGORITHM
  31         def_bool X86_XADD && 64BIT
  32
  33 config RWSEM_GENERIC_SPINLOCK
  34         def_bool !RWSEM_XCHGADD_ALGORITHM
  35
  36 config 3_LEVEL_PGTABLES
  37         bool "Three-level pagetables (EXPERIMENTAL)" if !64BIT
  38         default 64BIT
  39         depends on EXPERIMENTAL
  40         help
  41         Three-level pagetables will let UML have more than 4G of physical
  42         memory.  All the memory that can't be mapped directly will be treated
  43         as high memory.
  44
  45         However, this it experimental on 32-bit architectures, so if unsure say
  46         N (on x86-64 it's automatically enabled, instead, as it's safe there).
  47
  48 config ARCH_HAS_SC_SIGNALS
  49         def_bool !64BIT
  50
  51 config ARCH_REUSE_HOST_VSYSCALL_AREA
  52         def_bool !64BIT
  53
  54 config SMP_BROKEN
  55         def_bool 64BIT
  56
  57 config GENERIC_HWEIGHT
  58         def_bool y
  59
  60 source "arch/um/Kconfig.um"
  61
  62 endmenu
  63
  64 source "arch/um/Kconfig.rest"