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 | |
| 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 | /* var is in discarded region: offset to particular copy we want */ |
| 22 | #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu))) |
| 23 | #define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset())) |
| 24 | |
| 25 | /* A macro to avoid #include hell... */ |
| 26 | #define percpu_modcopy(pcpudst, src, size) \ |
| 27 | do { \ |
| 28 | unsigned int __i; \ |
Andrew Morton | 394e390 | 2006-03-23 03:01:05 -0800 | [diff] [blame] | 29 | for_each_cpu(__i) \ |
| 30 | memcpy((pcpudst)+__per_cpu_offset(__i), \ |
| 31 | (src), (size)); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | } while (0) |
| 33 | |
| 34 | extern void setup_per_cpu_areas(void); |
| 35 | |
| 36 | #else /* ! SMP */ |
| 37 | |
| 38 | #define DEFINE_PER_CPU(type, name) \ |
| 39 | __typeof__(type) per_cpu__##name |
| 40 | |
Jan Beulich | 11c80c8 | 2005-06-23 00:09:59 -0700 | [diff] [blame] | 41 | #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #define __get_cpu_var(var) per_cpu__##var |
| 43 | |
| 44 | #endif /* SMP */ |
| 45 | |
| 46 | #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name |
| 47 | |
| 48 | #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) |
| 49 | #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) |
| 50 | |
| 51 | #endif /* _ASM_X8664_PERCPU_H_ */ |