blob: 397e309839ddffdf3114dd3f7436ceb549eb3415 [file] [log] [blame]
Glauber Costae32640a2008-03-03 14:12:45 -03001/*
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
8DEFINE_PER_CPU(unsigned long, this_cpu_off);
9EXPORT_PER_CPU_SYMBOL(this_cpu_off);
10
Alex Nixonfc0091b2008-08-15 17:21:14 +010011/*
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 */
Glauber Costae32640a2008-03-03 14:12:45 -030016__cpuinit void init_gdt(int cpu)
17{
Alex Nixonfc0091b2008-08-15 17:21:14 +010018 struct desc_struct gdt;
Glauber Costae32640a2008-03-03 14:12:45 -030019
Alex Nixonfc0091b2008-08-15 17:21:14 +010020 pack_descriptor(&gdt, __per_cpu_offset[cpu], 0xFFFFF,
Glauber Costae32640a2008-03-03 14:12:45 -030021 0x2 | DESCTYPE_S, 0x8);
Alex Nixonfc0091b2008-08-15 17:21:14 +010022 gdt.s = 1;
Glauber Costae32640a2008-03-03 14:12:45 -030023
Alex Nixonfc0091b2008-08-15 17:21:14 +010024 write_gdt_entry(get_cpu_gdt_table(cpu),
25 GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S);
Glauber Costae32640a2008-03-03 14:12:45 -030026
27 per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu];
28 per_cpu(cpu_number, cpu) = cpu;
29}
30#endif