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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: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. J. Lu 2012-02-19 10:40:03 -08:00 committed by H. Peter Anvin
parent a06c9bc064
commit 5fd92e65a6
1 changed files with 17 additions and 4 deletions
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21
arch/x86/Kconfig
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@ -2165,9 +2165,9 @@ config IA32_EMULATION
depends on X86_64 depends on X86_64
select COMPAT_BINFMT_ELF select COMPAT_BINFMT_ELF
---help--- ---help---
Include code to run 32-bit programs under a 64-bit kernel. You should Include code to run legacy 32-bit programs under a
likely turn this on, unless you're 100% sure that you don't have any 64-bit kernel. You should likely turn this on, unless you're
32-bit programs left. 100% sure that you don't have any 32-bit programs left.
config IA32_AOUT config IA32_AOUT
tristate "IA32 a.out support" tristate "IA32 a.out support"
@ -2175,9 +2175,22 @@ config IA32_AOUT
---help--- ---help---
Support old a.out binaries in the 32bit emulation. 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 config COMPAT
def_bool y def_bool y
depends on IA32_EMULATION depends on IA32_EMULATION || X86_X32_ABI
config COMPAT_FOR_U64_ALIGNMENT config COMPAT_FOR_U64_ALIGNMENT
def_bool COMPAT def_bool COMPAT