Some OS (like VxWorks) requires GDT entry 1 to be the 32-bit CS.
Signed-off-by: Bin Meng bmeng.cn@gmail.com Tested-by: Jian Luo jian.luo4@boschrexroth.de ---
Changes in v2: None
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 */