[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>

1 files changed, 8 insertions, 6 deletions

diff --git a/arch/i386/kernel/efi.c b/arch/i386/kernel/efi.c
index e3e42fd62401..c9cad7ba0d2d 100644
--- a/arch/i386/kernel/efi.c
+++ b/arch/i386/kernel/efi.c
@@ -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();