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x86: use data32 directive instead of macro for operand-size prefix

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This file defines 'a32' and 'o32' macros to avoid magic numbers
of operand/address-size prefixing.

GAS supports 'data32' and 'addr32' for that purpose.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Masahiro Yamada 2019-12-03 14:20:49 +09:00 committed by Bin Meng
parent d79ae6aa30
commit 0d915a9aa4
1 changed files with 3 additions and 5 deletions
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8
arch/x86/cpu/start16.S
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@ -13,8 +13,6 @@
#include <asm/processor-flags.h>
#define BOOT_SEG 0xffff0000 /* linear segment of boot code */
#define a32 .byte 0x67;
#define o32 .byte 0x66;
.section .start16, "ax"
.code16
@ -33,8 +31,8 @@ start16:
wbinvd
/* load the temporary Global Descriptor Table */
o32 cs lidt idt_ptr
o32 cs lgdt gdt_ptr
data32 cs lidt idt_ptr
data32 cs lgdt gdt_ptr
/* Now, we enter protected mode */
movl %cr0, %eax
@ -49,7 +47,7 @@ ff:
movw $code32start, %ax
movw %ax, %bp
movl %ecx, %eax
o32 cs ljmp *(%bp)
data32 cs ljmp *(%bp)
/* 48-bit far pointer */
code32start: