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>
diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index 1b76ca1..812c5e4 100644
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -142,7 +142,12 @@
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 */