summaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/smpcommon.c
blob: 7e157810062f18e162e8ecb644e231aba455420d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
/*
 * SMP stuff which is common to all sub-architectures.
 */
#include <linux/module.h>
#include <asm/smp.h>
#include <asm/sections.h>

#ifdef CONFIG_X86_64
DEFINE_PER_CPU(unsigned long, this_cpu_off) = (unsigned long)__per_cpu_load;
#else
DEFINE_PER_CPU(unsigned long, this_cpu_off);
#endif
EXPORT_PER_CPU_SYMBOL(this_cpu_off);

#ifdef CONFIG_X86_32
/*
 * Initialize the CPU's GDT.  This is either the boot CPU doing itself
 * (still using the master per-cpu area), or a CPU doing it for a
 * secondary which will soon come up.
 */
__cpuinit void init_gdt(int cpu)
{
	struct desc_struct gdt;

	pack_descriptor(&gdt, __per_cpu_offset[cpu], 0xFFFFF,
			0x2 | DESCTYPE_S, 0x8);
	gdt.s = 1;

	write_gdt_entry(get_cpu_gdt_table(cpu),
			GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S);

	per_cpu(cpu_number, cpu) = cpu;
}
#endif
OpenPOWER on IntegriCloud