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x86: Initialize GDT entry 1 to be the 32-bit CS as well

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Some OS (like VxWorks) requires GDT entry 1 to be the 32-bit CS.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Jian Luo <jian.luo4@boschrexroth.de>
This commit is contained in:
Bin Meng 2015-10-07 20:19:09 -07:00 committed by Simon Glass
parent 1f124eba11
commit 19038e1bb6
1 changed files with 6 additions and 1 deletions
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7
arch/x86/cpu/cpu.c
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@ -142,7 +142,12 @@ void arch_setup_gd(gd_t *new_gd)
gdt_addr = new_gd->arch.gdt;
/* CS: code, read/execute, 4 GB, base 0 */
/*
* CS: code, read/execute, 4 GB, base 0
*
* Some OS (like VxWorks) requires GDT entry 1 to be the 32-bit CS
*/
gdt_addr[X86_GDT_ENTRY_UNUSED] = GDT_ENTRY(0xc09b, 0, 0xfffff);
gdt_addr[X86_GDT_ENTRY_32BIT_CS] = GDT_ENTRY(0xc09b, 0, 0xfffff);
/* DS: data, read/write, 4 GB, base 0 */