| Message ID | 1443086484-26942-2-git-send-email-bmeng.cn@gmail.com |
|---|---|
| State | Superseded |
| Delegated to: | Tom Rini |
| Headers | show |
On Thursday, 24 September 2015, 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> > --- > > 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 > Acked-by: Simon Glass <sjg@chromium.org>
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 */
Some OS (like VxWorks) requires GDT entry 1 to be the 32-bit CS. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> --- arch/x86/cpu/cpu.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)