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#define per_cpu_offset(x) (__per_cpu_offset(x))
18
19/* Separate out the type, so (int[3], foo) works. */
20#define DEFINE_PER_CPU(type, name) \
21    __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
22
23/* var is in discarded region: offset to particular copy we want */
24#define per_cpu(var, cpu) (*({				\
25	extern int simple_identifier_##var(void);	\
26	RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)); }))
27#define __get_cpu_var(var) (*({				\
28	extern int simple_identifier_##var(void);	\
29	RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); }))
30#define __raw_get_cpu_var(var) (*({			\
31	extern int simple_identifier_##var(void);	\
32	RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); }))
33
34/* A macro to avoid #include hell... */
35#define percpu_modcopy(pcpudst, src, size)			\
36do {								\
37	unsigned int __i;					\
38	for_each_possible_cpu(__i)				\
39		memcpy((pcpudst)+__per_cpu_offset(__i),		\
40		       (src), (size));				\
41} while (0)
42
43extern void setup_per_cpu_areas(void);
44
45#else /* ! SMP */
46
47#define DEFINE_PER_CPU(type, name) \
48    __typeof__(type) per_cpu__##name
49
50#define per_cpu(var, cpu)			(*((void)(cpu), &per_cpu__##var))
51#define __get_cpu_var(var)			per_cpu__##var
52#define __raw_get_cpu_var(var)			per_cpu__##var
53
54#endif	/* SMP */
55
56#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
57
58#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
59#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
60
61#endif /* _ASM_X8664_PERCPU_H_ */
62