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[PATCH] x86: add an accessor function for getting the per-CPU gdt

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Add an accessor function for getting the per-CPU gdt.  Callee must already
have the CPU.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Zachary Amsden
2005-10-30 14:59:34 -08:00
committed by Linus Torvalds
parent 72e12b76fe
commit 251e6912df
4 changed files with 32 additions and 27 deletions
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9
arch/i386/kernel/cpu/common.c
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@@ -573,6 +573,7 @@ void __devinit cpu_init(void)
int cpu = smp_processor_id();
struct tss_struct * t = &per_cpu(init_tss, cpu);
struct thread_struct *thread = &current->thread;
struct desc_struct *gdt = get_cpu_gdt_table(cpu);
__u32 stk16_off = (__u32)&per_cpu(cpu_16bit_stack, cpu);
if (cpu_test_and_set(cpu, cpu_initialized)) {
@@ -594,18 +595,16 @@ void __devinit cpu_init(void)
* Initialize the per-CPU GDT with the boot GDT,
* and set up the GDT descriptor:
*/
memcpy(&per_cpu(cpu_gdt_table, cpu), cpu_gdt_table,
GDT_SIZE);
memcpy(gdt, cpu_gdt_table, GDT_SIZE);
/* Set up GDT entry for 16bit stack */
*(__u64 *)&(per_cpu(cpu_gdt_table, cpu)[GDT_ENTRY_ESPFIX_SS]) |=
*(__u64 *)(&gdt[GDT_ENTRY_ESPFIX_SS]) |=
((((__u64)stk16_off) << 16) & 0x000000ffffff0000ULL) |
((((__u64)stk16_off) << 32) & 0xff00000000000000ULL) |
(CPU_16BIT_STACK_SIZE - 1);
cpu_gdt_descr[cpu].size = GDT_SIZE - 1;
cpu_gdt_descr[cpu].address =
(unsigned long)&per_cpu(cpu_gdt_table, cpu);
cpu_gdt_descr[cpu].address = (unsigned long)gdt;
load_gdt(&cpu_gdt_descr[cpu]);
load_idt(&idt_descr);