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x86_64: Use __BOOT_DS instead_of __KERNEL_DS for safety 

In startup_32, the running code still uses the initial GDT
located in setup. Thus, __BOOT_DS is preferred. Currently
__KERNEL_DS is lucky to equal to __BOOT_DS, but this is
not always a safe way.

Signed-off-by: Lans Zhang <lans.zhang2008@gmail.com>
Link: http://lkml.kernel.org/r/51300267.6000008@gmail.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Lans Zhang 2013-03-01 09:20:39 +08:00 committed by H. Peter Anvin
parent de1a2262b0
commit 2dead15fb8
1 changed files with 1 additions and 1 deletions
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2
arch/x86/boot/compressed/head_64.S
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@ -52,7 +52,7 @@ ENTRY(startup_32)
jnz 1f
cli
movl $(__KERNEL_DS), %eax
movl $(__BOOT_DS), %eax
movl %eax, %ds
movl %eax, %es
movl %eax, %ss