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Anton Blanchard7a0268f2006-01-11 13:16:44 +11001#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
Ingo Molnara875a692006-07-03 00:24:26 -070017#define per_cpu_offset(x) (__per_cpu_offset(x))
Anton Blanchard7a0268f2006-01-11 13:16:44 +110018
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
Fenghua Yu5fb7dc32007-07-19 01:48:12 -070023#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
Anton Blanchard7a0268f2006-01-11 13:16:44 +110028/* 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()))
Hugh Dickins048c8bc2006-11-01 05:44:54 +110031#define __raw_get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, local_paca->data_offset))
Anton Blanchard7a0268f2006-01-11 13:16:44 +110032
33/* A macro to avoid #include hell... */
34#define percpu_modcopy(pcpudst, src, size) \
35do { \
36 unsigned int __i; \
KAMEZAWA Hiroyuki0e551952006-03-28 14:50:51 -080037 for_each_possible_cpu(__i) \
Andrew Morton394e3902006-03-23 03:01:05 -080038 memcpy((pcpudst)+__per_cpu_offset(__i), \
39 (src), (size)); \
Anton Blanchard7a0268f2006-01-11 13:16:44 +110040} while (0)
41
42extern void setup_per_cpu_areas(void);
43
44#else /* ! SMP */
45
46#define DEFINE_PER_CPU(type, name) \
47 __typeof__(type) per_cpu__##name
Fenghua Yu5fb7dc32007-07-19 01:48:12 -070048#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
49 DEFINE_PER_CPU(type, name)
Anton Blanchard7a0268f2006-01-11 13:16:44 +110050
51#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
52#define __get_cpu_var(var) per_cpu__##var
Paul Mackerrasbfe5d832006-06-25 05:47:14 -070053#define __raw_get_cpu_var(var) per_cpu__##var
Anton Blanchard7a0268f2006-01-11 13:16:44 +110054
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
Stephen Rothwell6f9aa722005-08-29 14:08:11 +100063#include <asm-generic/percpu.h>
Anton Blanchard7a0268f2006-01-11 13:16:44 +110064#endif
65
66#endif /* _ASM_POWERPC_PERCPU_H_ */