define new percpu interface for shared data
[linux-2.6.git] / include / asm-sparc64 / percpu.h
1 #ifndef __ARCH_SPARC64_PERCPU__
2 #define __ARCH_SPARC64_PERCPU__
3
4 #include <linux/compiler.h>
5
6 #ifdef CONFIG_SMP
7
8 #define setup_per_cpu_areas()                   do { } while (0)
9 extern void real_setup_per_cpu_areas(void);
10
11 extern unsigned long __per_cpu_base;
12 extern unsigned long __per_cpu_shift;
13 #define __per_cpu_offset(__cpu) \
14         (__per_cpu_base + ((unsigned long)(__cpu) << __per_cpu_shift))
15 #define per_cpu_offset(x) (__per_cpu_offset(x))
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 #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)               \
22     __attribute__((__section__(".data.percpu.shared_aligned"))) \
23     __typeof__(type) per_cpu__##name                            \
24     ____cacheline_aligned_in_smp
25
26 register unsigned long __local_per_cpu_offset asm("g5");
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, __local_per_cpu_offset))
31 #define __raw_get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __local_per_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 #else /* ! SMP */
42
43 #define real_setup_per_cpu_areas()              do { } while (0)
44 #define DEFINE_PER_CPU(type, name) \
45     __typeof__(type) per_cpu__##name
46 #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)       \
47     DEFINE_PER_CPU(type, name)
48
49 #define per_cpu(var, cpu)                       (*((void)cpu, &per_cpu__##var))
50 #define __get_cpu_var(var)                      per_cpu__##var
51 #define __raw_get_cpu_var(var)                  per_cpu__##var
52
53 #endif  /* SMP */
54
55 #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
56
57 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
58 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
59
60 #endif /* __ARCH_SPARC64_PERCPU__ */