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Commit 5fd92e65 authored by H. J. Lu's avatar H. J. Lu Committed by H. Peter Anvin
Browse files

x32: Allow x32 to be configured 



At this point, one should be able to build an x32 kernel.

Note that for now we depend on CONFIG_IA32_EMULATION.  Long term, x32
and IA32 should be detangled.

Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent a06c9bc0

arch/x86/Kconfig

+17 −4
Original line number Diff line number Diff line
@@ -2165,9 +2165,9 @@ config IA32_EMULATION 
	depends on X86_64

	select COMPAT_BINFMT_ELF

	---help---

	  Include code to run 32-bit programs under a 64-bit kernel. You should

	  likely turn this on, unless you're 100% sure that you don't have any

	  32-bit programs left.

	  Include code to run legacy 32-bit programs under a

	  64-bit kernel. You should likely turn this on, unless you're

	  100% sure that you don't have any 32-bit programs left.



config IA32_AOUT

	tristate "IA32 a.out support"
@@ -2175,9 +2175,22 @@ config IA32_AOUT 
	---help---

	  Support old a.out binaries in the 32bit emulation.



config X86_X32_ABI

	bool "x32 ABI for 64-bit mode (EXPERIMENTAL)"

	depends on X86_64 && IA32_EMULATION && EXPERIMENTAL

	---help---

	  Include code to run binaries for the x32 native 32-bit ABI

	  for 64-bit processors.  An x32 process gets access to the

	  full 64-bit register file and wide data path while leaving

	  pointers at 32 bits for smaller memory footprint.



	  You will need a recent binutils (2.22 or later) with

	  elf32_x86_64 support enabled to compile a kernel with this

	  option set.



config COMPAT

	def_bool y

	depends on IA32_EMULATION

	depends on IA32_EMULATION || X86_X32_ABI



config COMPAT_FOR_U64_ALIGNMENT

	def_bool COMPAT