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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 | ||
14 | #define __per_cpu_offset(cpu) (cpu_pda[cpu].data_offset) | |
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; \ | |
29 | for (__i = 0; __i < NR_CPUS; __i++) \ | |
30 | if (cpu_possible(__i)) \ | |
31 | memcpy((pcpudst)+__per_cpu_offset(__i), \ | |
32 | (src), (size)); \ | |
33 | } while (0) | |
34 | ||
35 | extern void setup_per_cpu_areas(void); | |
36 | ||
37 | #else /* ! SMP */ | |
38 | ||
39 | #define DEFINE_PER_CPU(type, name) \ | |
40 | __typeof__(type) per_cpu__##name | |
41 | ||
11c80c83 | 42 | #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) |
1da177e4 LT |
43 | #define __get_cpu_var(var) per_cpu__##var |
44 | ||
45 | #endif /* SMP */ | |
46 | ||
47 | #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name | |
48 | ||
49 | #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) | |
50 | #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) | |
51 | ||
52 | #endif /* _ASM_X8664_PERCPU_H_ */ |