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x86: Tidy up the 64-bit calling code

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The GDT works but technically the length is incorrect. Fix this and add a
comment.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2015-07-31 09:31:30 -06:00
parent 0d9edd2dfb
commit 0bc74ab3e6
1 changed files with 2 additions and 2 deletions
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arch/x86/cpu/call64.S
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@@ -82,8 +82,8 @@ lret_target:
.data .data
gdt: gdt:
.word gdt_end - gdt .word gdt_end - gdt - 1
.long gdt .long gdt /* Fixed up by code above */
.word 0 .word 0
.quad 0x0000000000000000 /* NULL descriptor */ .quad 0x0000000000000000 /* NULL descriptor */
.quad 0x00af9a000000ffff /* __KERNEL_CS */ .quad 0x00af9a000000ffff /* __KERNEL_CS */