lkml.org 
[lkml]   [2010]   [Jul]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:x86/asm] x86-64: Simplify loading initial_gs
Commit-ID:  650fb4393dff543bc980d361555c489fbdeed088
Gitweb: http://git.kernel.org/tip/650fb4393dff543bc980d361555c489fbdeed088
Author: Brian Gerst <brgerst@gmail.com>
AuthorDate: Sat, 17 Jul 2010 09:03:28 -0400
Committer: H. Peter Anvin <hpa@zytor.com>
CommitDate: Wed, 21 Jul 2010 21:23:51 -0700

x86-64: Simplify loading initial_gs

Load initial_gs as two 32-bit values instead of splitting a 64-bit value.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
LKML-Reference: <1279371808-24804-3-git-send-email-brgerst@gmail.com>
Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
arch/x86/kernel/head_64.S | 5 ++---
1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 3d1e6f1..239046b 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -234,9 +234,8 @@ ENTRY(secondary_startup_64)
* init data section till per cpu areas are set up.
*/
movl $MSR_GS_BASE,%ecx
- movq initial_gs(%rip),%rax
- movq %rax,%rdx
- shrq $32,%rdx
+ movl initial_gs(%rip),%eax
+ movl initial_gs+4(%rip),%edx
wrmsr

/* esi is pointer to real mode structure with interesting info.

\
 
 \ /
  Last update: 2010-07-22 07:05    [W:0.085 / U:0.264 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site