Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / arch / x86 / kernel / smpcommon.c
1 /*
2  * SMP stuff which is common to all sub-architectures.
3  */
4 #include <linux/module.h>
5 #include <asm/smp.h>
6
7 #ifdef CONFIG_X86_32
8 DEFINE_PER_CPU(unsigned long, this_cpu_off);
9 EXPORT_PER_CPU_SYMBOL(this_cpu_off);
10
11 /*
12  * Initialize the CPU's GDT.  This is either the boot CPU doing itself
13  * (still using the master per-cpu area), or a CPU doing it for a
14  * secondary which will soon come up.
15  */
16 __cpuinit void init_gdt(int cpu)
17 {
18         struct desc_struct gdt;
19
20         pack_descriptor(&gdt, __per_cpu_offset[cpu], 0xFFFFF,
21                         0x2 | DESCTYPE_S, 0x8);
22         gdt.s = 1;
23
24         write_gdt_entry(get_cpu_gdt_table(cpu),
25                         GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S);
26
27         per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu];
28         per_cpu(cpu_number, cpu) = cpu;
29 }
30 #endif