diff options
| author | Bin Meng <bmeng.cn@gmail.com> | 2015-10-07 20:19:09 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-10-21 07:46:25 -0600 |
| commit | 19038e1bb629a365aaf971a65744e2f0e8866d62 (patch) | |
| tree | 2c9b02a3a1cdaf0d5e6243eef59eb2c13b482b30 /arch/x86 | |
| parent | 1f124eba11cb1619e6d575770756230484e47bf7 (diff) | |
x86: Initialize GDT entry 1 to be the 32-bit CS as well
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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/cpu/cpu.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c index 1b76ca117e..812c5e4e6b 100644 --- a/arch/x86/cpu/cpu.c +++ b/arch/x86/cpu/cpu.c @@ -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 */ |