diff options
| author | H. Peter Anvin <hpa@zytor.com> | 2014-05-04 10:36:22 -0700 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2014-12-13 15:16:10 +0100 |
| commit | 0a6feab8c3d56488549ef15fdeba4ce20dc4b8a9 (patch) | |
| tree | cfbd98af4ac15f64739312ce37e88dab8393b117 /arch/x86/Kconfig | |
| parent | 6e4bcdb55bf0a18b3dbbd6b3bc4d4526133fcd0c (diff) | |
x86, espfix: Make it possible to disable 16-bit support
commit 34273f41d57ee8d854dcd2a1d754cbb546cb548f upstream.
Embedded systems, which may be very memory-size-sensitive, are
extremely unlikely to ever encounter any 16-bit software, so make it
a CONFIG_EXPERT option to turn off support for any 16-bit software
whatsoever.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Link: http://lkml.kernel.org/r/1398816946-3351-1-git-send-email-hpa@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
(cherry picked from 3.2 commit 70d87cbbd92a3611655b39003176ee1033796bf7)
[wt: backport notes for 2.6.32 :
- Fixed arch/x86/kernel/ldt.c (no IS_ENABLED on 2.6.32).
- No CONFIG_EXPERT condition in 2.6.32.
/wt]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 026fe602684a..67c318736c99 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -882,14 +882,27 @@ config VM86 default y depends on X86_32 ---help--- - This option is required by programs like DOSEMU to run 16-bit legacy - code on X86 processors. It also may be needed by software like - XFree86 to initialize some video cards via BIOS. Disabling this - option saves about 6k. + This option is required by programs like DOSEMU to run + 16-bit real mode legacy code on x86 processors. It also may + be needed by software like XFree86 to initialize some video + cards via BIOS. Disabling this option saves about 6K. + +config X86_16BIT + bool "Enable support for 16-bit segments" + default y + ---help--- + This option is required by programs like Wine to run 16-bit + protected mode legacy code on x86 processors. Disabling + this option saves about 300 bytes on i386, or around 6K text + plus 16K runtime memory on x86-64, + +config X86_ESPFIX32 + def_bool y + depends on X86_16BIT && X86_32 config X86_ESPFIX64 def_bool y - depends on X86_64 + depends on X86_16BIT && X86_64 config TOSHIBA tristate "Toshiba Laptop support" |