[U-Boot] [PATCH 1/8] x86: Initialize GDT entry 1 to be the 32-bit CS as well

[Bin Meng]

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

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
---

 arch/x86/cpu/cpu.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

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 @@ 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 */
-- 
1.8.2.1