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authorWei Yang <richard.weiyang@gmail.com>2016-11-01 15:49:24 +0000
committerIngo Molnar <mingo@kernel.org>2016-11-07 08:33:59 +0100
commit064025f7ea1ebcd9bbb99cfa9492a803e8b01d36 (patch)
tree9b23d4de731ef193e5231fd03f715b33d9006f5f /arch/x86/boot
parent0acba3f91823a5e53a54af5dc31fc774b0e64e99 (diff)
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x86/boot: Simplify the GDTR calculation assembly code a bit
This patch calculates the GDTR's base address via a single instruction. ( EBP contains the address where it is loaded and GDTR's base address is already set to "gdt" in compilation. It is fine to get the correct base address by adding the delta to GDTR's base address. ) Signed-off-by: Wei Yang <richard.weiyang@gmail.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1478015364-5547-1-git-send-email-richard.weiyang@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/boot')
-rw-r--r--arch/x86/boot/compressed/head_64.S3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index efdfba21a5b2..4d85e600db78 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -119,8 +119,7 @@ ENTRY(startup_32)
*/
/* Load new GDT with the 64bit segments using 32bit descriptor */
- leal gdt(%ebp), %eax
- movl %eax, gdt+2(%ebp)
+ addl %ebp, gdt+2(%ebp)
lgdt gdt(%ebp)
/* Enable PAE mode */