diff options
| author |   Vivek Goyal <vgoyal@in.ibm.com> | 2007-05-02 19:27:07 +0200 |
|---|---|---|
| committer |   Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 19:27:07 +0200 |
| commit | 30f472895401fbe8e64f861a2569bc9acb098741 (patch) | |
| tree | 121c0836f9327125e14e1b54d7a82da722efa6a5 /include | |
| parent | [PATCH] x86-64: modify copy_bootdata to use virtual addresses (diff) | |
| download | linux-dev-30f472895401fbe8e64f861a2569bc9acb098741.tar.xz linux-dev-30f472895401fbe8e64f861a2569bc9acb098741.zip | |
[PATCH] x86-64: cleanup segments
Move __KERNEL32_CS up into the unused gdt entry. __KERNEL32_CS is
used when entering the kernel so putting it first is useful when
trying to keep boot gdt sizes to a minimum.
Set the accessed bit on all gdt entries. We don't care
so there is no need for the cpu to burn the extra cycles,
and it potentially allows the pages to be immutable. Plus
it is confusing when debugging and your gdt entries mysteriously
change.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-x86_64/segment.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-x86_64/segment.h b/include/asm-x86_64/segment.h index 334ddcdd8f92..adf2bf1e187c 100644 --- a/include/asm-x86_64/segment.h +++ b/include/asm-x86_64/segment.h @@ -6,7 +6,7 @@ #define __KERNEL_CS 0x10 #define __KERNEL_DS 0x18 -#define __KERNEL32_CS 0x38 +#define __KERNEL32_CS 0x08 /* * we cannot use the same code segment descriptor for user and kernel |