Edgar Hucek <[email protected]> wrote:
>
> This patch makes the kernel bootable again on ia32 EFI systems.
>
Argh, thanks. I'll move the per_cpu() call inside the lock, just in case
we happen to be running preemptibly there.
Zach, Matt: please review, test and ack asap?
diff -puN arch/i386/kernel/efi.c~efi-fix-gdt-load arch/i386/kernel/efi.c
--- devel/arch/i386/kernel/efi.c~efi-fix-gdt-load 2006-03-04 18:40:20.000000000 -0800
+++ devel-akpm/arch/i386/kernel/efi.c 2006-03-04 18:41:50.000000000 -0800
@@ -70,10 +70,13 @@ static void efi_call_phys_prelog(void)
{
unsigned long cr4;
unsigned long temp;
+ struct Xgt_desc_struct *cpu_gdt_descr;
spin_lock(&efi_rt_lock);
local_irq_save(efi_rt_eflags);
+ cpu_gdt_descr = &per_cpu(cpu_gdt_descr, 0);
+
/*
* If I don't have PSE, I should just duplicate two entries in page
* directory. If I have PSE, I just need to duplicate one entry in
@@ -103,18 +106,17 @@ static void efi_call_phys_prelog(void)
*/
local_flush_tlb();
- per_cpu(cpu_gdt_descr, 0).address =
- __pa(per_cpu(cpu_gdt_descr, 0).address);
- load_gdt((struct Xgt_desc_struct *)__pa(&per_cpu(cpu_gdt_descr, 0)));
+ cpu_gdt_descr->address = __pa(cpu_gdt_descr->address);
+ load_gdt(cpu_gdt_descr);
}
static void efi_call_phys_epilog(void)
{
unsigned long cr4;
+ struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, 0);
- per_cpu(cpu_gdt_descr, 0).address =
- (unsigned long)__va(per_cpu(cpu_gdt_descr, 0).address);
- load_gdt((struct Xgt_desc_struct *)__va(&per_cpu(cpu_gdt_descr, 0)));
+ cpu_gdt_descr->address = __va(cpu_gdt_descr->address);
+ load_gdt(cpu_gdt_descr);
cr4 = read_cr4();
_
-
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