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1#ifndef _ASM_X8664_PERCPU_H_
2#define _ASM_X8664_PERCPU_H_
3#include <linux/compiler.h>
4
5/* Same as asm-generic/percpu.h, except that we store the per cpu offset
6 in the PDA. Longer term the PDA and every per cpu variable
7 should be just put into a single section and referenced directly
8 from %gs */
9
10#ifdef CONFIG_SMP
11
12#include <asm/pda.h>
13
14#define __per_cpu_offset(cpu) (cpu_pda[cpu].data_offset)
15#define __my_cpu_offset() read_pda(data_offset)
16
17/* Separate out the type, so (int[3], foo) works. */
18#define DEFINE_PER_CPU(type, name) \
19 __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
20
21/* var is in discarded region: offset to particular copy we want */
22#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
23#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
24
25/* A macro to avoid #include hell... */
26#define percpu_modcopy(pcpudst, src, size) \
27do { \
28 unsigned int __i; \
29 for (__i = 0; __i < NR_CPUS; __i++) \
30 if (cpu_possible(__i)) \
31 memcpy((pcpudst)+__per_cpu_offset(__i), \
32 (src), (size)); \
33} while (0)
34
35extern void setup_per_cpu_areas(void);
36
37#else /* ! SMP */
38
39#define DEFINE_PER_CPU(type, name) \
40 __typeof__(type) per_cpu__##name
41
42#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
43#define __get_cpu_var(var) per_cpu__##var
44
45#endif /* SMP */
46
47#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
48
49#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
50#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
51
52#endif /* _ASM_X8664_PERCPU_H_ */