From: Bin Meng Date: Thu, 8 Oct 2015 03:19:09 +0000 (-0700) Subject: x86: Initialize GDT entry 1 to be the 32-bit CS as well X-Git-Tag: v2016.01-rc1~298^2~49 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=19038e1bb629a365aaf971a65744e2f0e8866d62;p=platform%2Fkernel%2Fu-boot.git 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 Acked-by: Simon Glass Tested-by: Jian Luo --- 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 */