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[PATCH] i386: cleanup GDT Access

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Now we have an explicit per-cpu GDT variable, we don't need to keep the
descriptors around to use them to find the GDT: expose cpu_gdt directly.

We could go further and make load_gdt() pack the descriptor for us, or even
assume it means "load the current cpu's GDT" which is what it always does.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Rusty Russell
2007-05-02 19:27:11 +02:00
committed by Andi Kleen
parent 141f9cfe0a
commit 4fbb596881
6 changed files with 19 additions and 27 deletions
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16
arch/i386/kernel/efi.c
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@@ -69,13 +69,11 @@ static void efi_call_phys_prelog(void) __acquires(efi_rt_lock)
{
unsigned long cr4;
unsigned long temp;
struct Xgt_desc_struct *cpu_gdt_descr;
struct Xgt_desc_struct 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
@@ -105,17 +103,19 @@ static void efi_call_phys_prelog(void) __acquires(efi_rt_lock)
*/
local_flush_tlb();
cpu_gdt_descr->address = __pa(cpu_gdt_descr->address);
load_gdt(cpu_gdt_descr);
gdt_descr.address = __pa(get_cpu_gdt_table(0));
gdt_descr.size = GDT_SIZE - 1;
load_gdt(&gdt_descr);
}
static void efi_call_phys_epilog(void) __releases(efi_rt_lock)
{
unsigned long cr4;
struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, 0);
struct Xgt_desc_struct gdt_descr;
cpu_gdt_descr->address = (unsigned long)__va(cpu_gdt_descr->address);
load_gdt(cpu_gdt_descr);
gdt_descr.address = (unsigned long)get_cpu_gdt_table(0);
gdt_descr.size = GDT_SIZE - 1;
load_gdt(&gdt_descr);
cr4 = read_cr4();