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[U-Boot,v3,01/12] x86: Initialize GDT entry 1 to be the 32-bit CS as well

Message ID 1444274360-30189-2-git-send-email-bmeng.cn@gmail.com
State Accepted
Delegated to: Simon Glass
Headers show

Commit Message

Bin Meng Oct. 8, 2015, 3:19 a.m. UTC 
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>
---

Changes in v3: None
Changes in v2: None

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

Comments

Simon Glass Oct. 18, 2015, 9:37 p.m. UTC | #1 
On 7 October 2015 at 21:19, Bin Meng <bmeng.cn@gmail.com> wrote:
> 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>
> ---
>
> Changes in v3: None
> Changes in v2: None
>
>  arch/x86/cpu/cpu.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)

Applied to u-boot-x86, thanks!
diff mbox

Patch

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 */