x86: Tidy up the 64-bit calling code
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>
diff --git a/arch/x86/cpu/call64.S b/arch/x86/cpu/call64.S
index 74dd5a8..08dc473 100644
--- a/arch/x86/cpu/call64.S
+++ b/arch/x86/cpu/call64.S
@@ -82,8 +82,8 @@
.data
gdt:
- .word gdt_end - gdt
- .long gdt
+ .word gdt_end - gdt - 1
+ .long gdt /* Fixed up by code above */
.word 0
.quad 0x0000000000000000 /* NULL descriptor */
.quad 0x00af9a000000ffff /* __KERNEL_CS */