[PATCH] i386: espfix cleanup
authorStas Sergeev <stsp@aknet.ru>
Thu, 7 Dec 2006 01:14:01 +0000 (02:14 +0100)
committerAndi Kleen <andi@basil.nowhere.org>
Thu, 7 Dec 2006 01:14:01 +0000 (02:14 +0100)
commitbe44d2aabce2d62f72d5751d1871b6212bf7a1c7
tree3f190dd5b5747ee83b50c4596b4801ce6c6b551c
parentbb81a09e55eaf7e5f798468ab971469b6f66a259
[PATCH] i386: espfix cleanup

Clean up the espfix code:

- Introduced PER_CPU() macro to be used from asm
- Introduced GET_DESC_BASE() macro to be used from asm
- Rewrote the fixup code in asm, as calling a C code with the altered %ss
  appeared to be unsafe
- No longer altering the stack from a .fixup section
- 16bit per-cpu stack is no longer used, instead the stack segment base
  is patched the way so that the high word of the kernel and user %esp
  are the same.
- Added the limit-patching for the espfix segment. (Chuck Ebbert)

[jeremy@goop.org: use the x86 scaling addressing mode rather than shifting]
Signed-off-by: Stas Sergeev <stsp@aknet.ru>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Zachary Amsden <zach@vmware.com>
Acked-by: Chuck Ebbert <76306.1226@compuserve.com>
Acked-by: Jan Beulich <jbeulich@novell.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
arch/i386/kernel/asm-offsets.c
arch/i386/kernel/cpu/common.c
arch/i386/kernel/entry.S
arch/i386/kernel/head.S
arch/i386/kernel/traps.c
include/asm-i386/desc.h
include/asm-i386/percpu.h