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x86/boot: Simplify the GDTR calculation assembly code a bit

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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>
This commit is contained in:
Wei Yang 2016-11-01 15:49:24 +00:00 committed by Ingo Molnar
parent 0acba3f918
commit 064025f7ea
1 changed files with 1 additions and 2 deletions
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3
arch/x86/boot/compressed/head_64.S
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@ -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 */