projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | ||
| df79efde | 14 | #define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset) |
| 1da177e4 LT |
15 | #define __my_cpu_offset() read_pda(data_offset) |
| 16 | ||
| a875a69f IM |
17 | #define per_cpu_offset(x) (__per_cpu_offset(x)) |
| 18 | ||
| 1da177e4 LT |
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 */ | |
| 632bbfee | 24 | #define per_cpu(var, cpu) (*({ \ |
| a666ecfb | 25 | extern int simple_identifier_##var(void); \ |
| 632bbfee JB |
26 | RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)); })) |
| 27 | #define __get_cpu_var(var) (*({ \ | |
| a666ecfb | 28 | extern int simple_identifier_##var(void); \ |
| 632bbfee JB |
29 | RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); })) |
| 30 | #define __raw_get_cpu_var(var) (*({ \ | |
| a666ecfb | 31 | extern int simple_identifier_##var(void); \ |
| 632bbfee | 32 | RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); })) |
| 1da177e4 LT |
33 | |
| 34 | /* A macro to avoid #include hell... */ | |
| 35 | #define percpu_modcopy(pcpudst, src, size) \ | |
| 36 | do { \ | |
| 37 | unsigned int __i; \ | |
| 676ff453 | 38 | for_each_possible_cpu(__i) \ |
| 394e3902 AM |
39 | memcpy((pcpudst)+__per_cpu_offset(__i), \ |
| 40 | (src), (size)); \ | |
| 1da177e4 LT |
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 | ||
| 11c80c83 | 50 | #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) |
| 1da177e4 | 51 | #define __get_cpu_var(var) per_cpu__##var |
| bfe5d834 | 52 | #define __raw_get_cpu_var(var) per_cpu__##var |
| 1da177e4 LT |
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_ */ |