c6fbb67eac907736dd7d016fdda53df9e3cf1866
[linux-2.6.git] / include / asm-x86_64 / percpu.h
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)                      \
36 do {                                                            \
37         unsigned int __i;                                       \
38         for_each_possible_cpu(__i)                              \
39                 memcpy((pcpudst)+__per_cpu_offset(__i),         \
40                        (src), (size));                          \
41 } while (0)
42
43 extern 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_ */