define new percpu interface for shared data
[linux-2.6.git] / include / asm-powerpc / percpu.h
1 #ifndef _ASM_POWERPC_PERCPU_H_
2 #define _ASM_POWERPC_PERCPU_H_
3 #ifdef __powerpc64__
4 #include <linux/compiler.h>
5
6 /*
7  * Same as asm-generic/percpu.h, except that we store the per cpu offset
8  * in the paca. Based on the x86-64 implementation.
9  */
10
11 #ifdef CONFIG_SMP
12
13 #include <asm/paca.h>
14
15 #define __per_cpu_offset(cpu) (paca[cpu].data_offset)
16 #define __my_cpu_offset() get_paca()->data_offset
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 #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)               \
24     __attribute__((__section__(".data.percpu.shared_aligned"))) \
25     __typeof__(type) per_cpu__##name                            \
26     ____cacheline_aligned_in_smp
27
28 /* var is in discarded region: offset to particular copy we want */
29 #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
30 #define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
31 #define __raw_get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
32
33 /* A macro to avoid #include hell... */
34 #define percpu_modcopy(pcpudst, src, size)                      \
35 do {                                                            \
36         unsigned int __i;                                       \
37         for_each_possible_cpu(__i)                              \
38                 memcpy((pcpudst)+__per_cpu_offset(__i),         \
39                        (src), (size));                          \
40 } while (0)
41
42 extern void setup_per_cpu_areas(void);
43
44 #else /* ! SMP */
45
46 #define DEFINE_PER_CPU(type, name) \
47     __typeof__(type) per_cpu__##name
48 #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)       \
49     DEFINE_PER_CPU(type, name)
50
51 #define per_cpu(var, cpu)                       (*((void)(cpu), &per_cpu__##var))
52 #define __get_cpu_var(var)                      per_cpu__##var
53 #define __raw_get_cpu_var(var)                  per_cpu__##var
54
55 #endif  /* SMP */
56
57 #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
58
59 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
60 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
61
62 #else
63 #include <asm-generic/percpu.h>
64 #endif
65
66 #endif /* _ASM_POWERPC_PERCPU_H_ */