Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Ravikiran G Thirumalai | df79efd | 2006-01-11 22:45:39 +0100 | [diff] [blame] | 14 | #define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #define __my_cpu_offset() read_pda(data_offset) |
| 16 | |
Ingo Molnar | a875a69 | 2006-07-03 00:24:26 -0700 | [diff] [blame] | 17 | #define per_cpu_offset(x) (__per_cpu_offset(x)) |
| 18 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Jan Blunck | 632bbfe | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 24 | #define per_cpu(var, cpu) (*({ \ |
Jan Blunck | a666ecf | 2006-10-06 00:43:58 -0700 | [diff] [blame] | 25 | extern int simple_identifier_##var(void); \ |
Jan Blunck | 632bbfe | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 26 | RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)); })) |
| 27 | #define __get_cpu_var(var) (*({ \ |
Jan Blunck | a666ecf | 2006-10-06 00:43:58 -0700 | [diff] [blame] | 28 | extern int simple_identifier_##var(void); \ |
Jan Blunck | 632bbfe | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 29 | RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); })) |
| 30 | #define __raw_get_cpu_var(var) (*({ \ |
Jan Blunck | a666ecf | 2006-10-06 00:43:58 -0700 | [diff] [blame] | 31 | extern int simple_identifier_##var(void); \ |
Jan Blunck | 632bbfe | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 32 | RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); })) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | /* A macro to avoid #include hell... */ |
| 35 | #define percpu_modcopy(pcpudst, src, size) \ |
| 36 | do { \ |
| 37 | unsigned int __i; \ |
KAMEZAWA Hiroyuki | 676ff45 | 2006-04-18 22:20:21 -0700 | [diff] [blame] | 38 | for_each_possible_cpu(__i) \ |
Andrew Morton | 394e390 | 2006-03-23 03:01:05 -0800 | [diff] [blame] | 39 | memcpy((pcpudst)+__per_cpu_offset(__i), \ |
| 40 | (src), (size)); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Jan Beulich | 11c80c8 | 2005-06-23 00:09:59 -0700 | [diff] [blame] | 50 | #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #define __get_cpu_var(var) per_cpu__##var |
Paul Mackerras | bfe5d83 | 2006-06-25 05:47:14 -0700 | [diff] [blame] | 52 | #define __raw_get_cpu_var(var) per_cpu__##var |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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_ */ |