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[PATCH] EFI: Fix gdt load 

This patch makes the kernel bootable again on ia32 EFI systems.

Signed-off-by: Edgar Hucek <hostmaster@ed-soft.at>
Cc: Matt Domsch <Matt_Domsch@dell.com>
Cc: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Edgar Hucek 2006-03-06 15:42:54 -08:00 committed by Linus Torvalds
parent 397874dfe9
commit e8c3b5a6fa
1 changed files with 8 additions and 6 deletions
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14
arch/i386/kernel/efi.c
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@ -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();