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arch/x86: Prepare GDT for x86_64

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Make GDT a separate table and don't reuse GDT descriptor as unused
first field of GDT.

Required for separate x86_64 GDT descriptor, pointing to the same
GDT.

Tested on qemu.

Change-Id: I513329b67d49ade1055bc07cf7b93ff2e0131e0b
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31769
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Patrick Rudolph 2019-03-03 17:58:54 +01:00 committed by Patrick Georgi
parent 0c590f064e
commit 4e8dee51e3
1 changed files with 6 additions and 2 deletions
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8
src/arch/x86/gdt_init.S
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@ -21,11 +21,15 @@ gdt_init:
.previous
.align 4
.globl gdtptr
gdt:
gdtptr:
.word gdt_end - gdt -1 /* compute the table limit */
.long gdt /* we know the offset */
.word 0
.align 4
gdt:
/* selgdt 0, unused */
.word 0x0000, 0x0000 /* dummy */
.byte 0x00, 0x00, 0x00, 0x00
/* selgdt 0x08, flat code segment */
.word 0xffff, 0x0000