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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
Ravikiran G Thirumalaidf79efd2006-01-11 22:45:39 +010014#define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#define __my_cpu_offset() read_pda(data_offset)
16
Ingo Molnara875a692006-07-03 00:24:26 -070017#define per_cpu_offset(x) (__per_cpu_offset(x))
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019/* 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_internodealigned_in_smp
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028/* var is in discarded region: offset to particular copy we want */
Jan Blunck632bbfe2006-09-25 23:30:53 -070029#define per_cpu(var, cpu) (*({ \
Jan Bluncka666ecf2006-10-06 00:43:58 -070030 extern int simple_identifier_##var(void); \
Jan Blunck632bbfe2006-09-25 23:30:53 -070031 RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)); }))
32#define __get_cpu_var(var) (*({ \
Jan Bluncka666ecf2006-10-06 00:43:58 -070033 extern int simple_identifier_##var(void); \
Jan Blunck632bbfe2006-09-25 23:30:53 -070034 RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); }))
35#define __raw_get_cpu_var(var) (*({ \
Jan Bluncka666ecf2006-10-06 00:43:58 -070036 extern int simple_identifier_##var(void); \
Jan Blunck632bbfe2006-09-25 23:30:53 -070037 RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); }))
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39/* A macro to avoid #include hell... */
40#define percpu_modcopy(pcpudst, src, size) \
41do { \
42 unsigned int __i; \
KAMEZAWA Hiroyuki676ff452006-04-18 22:20:21 -070043 for_each_possible_cpu(__i) \
Andrew Morton394e3902006-03-23 03:01:05 -080044 memcpy((pcpudst)+__per_cpu_offset(__i), \
45 (src), (size)); \
Linus Torvalds1da177e2005-04-16 15:20:36 -070046} while (0)
47
48extern void setup_per_cpu_areas(void);
49
50#else /* ! SMP */
51
52#define DEFINE_PER_CPU(type, name) \
53 __typeof__(type) per_cpu__##name
Fenghua Yu5fb7dc32007-07-19 01:48:12 -070054#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
55 DEFINE_PER_CPU(type, name)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Jan Beulich11c80c82005-06-23 00:09:59 -070057#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#define __get_cpu_var(var) per_cpu__##var
Paul Mackerrasbfe5d832006-06-25 05:47:14 -070059#define __raw_get_cpu_var(var) per_cpu__##var
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61#endif /* SMP */
62
63#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
64
65#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
66#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
67
68#endif /* _ASM_X8664_PERCPU_H_ */