Commit 2dead15f authored Mar 01, 2013 by Lans Zhang Committed by H. Peter Anvin Mar 01, 2013

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>

parent de1a2262

arch/x86/boot/compressed/head_64.S

+1 −1

Original line number	Diff line number	Diff line
		@@ -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