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1 | #ifndef __ARCH_S390_PERCPU__ |
2 | #define __ARCH_S390_PERCPU__ | |
3 | ||
4 | #include <linux/compiler.h> | |
5 | #include <asm/lowcore.h> | |
6 | ||
7 | #define __GENERIC_PER_CPU | |
8 | ||
9 | /* | |
10 | * s390 uses its own implementation for per cpu data, the offset of | |
11 | * the cpu local data area is cached in the cpu's lowcore memory. | |
12 | * For 64 bit module code s390 forces the use of a GOT slot for the | |
13 | * address of the per cpu variable. This is needed because the module | |
14 | * may be more than 4G above the per cpu area. | |
15 | */ | |
16 | #if defined(__s390x__) && defined(MODULE) | |
17 | ||
18 | #define __reloc_hide(var,offset) \ | |
19 | (*({ unsigned long *__ptr; \ | |
20 | asm ( "larl %0,per_cpu__"#var"@GOTENT" \ | |
21 | : "=a" (__ptr) : "X" (per_cpu__##var) ); \ | |
22 | (typeof(&per_cpu__##var))((*__ptr) + (offset)); })) | |
23 | ||
24 | #else | |
25 | ||
26 | #define __reloc_hide(var, offset) \ | |
27 | (*({ unsigned long __ptr; \ | |
28 | asm ( "" : "=a" (__ptr) : "0" (&per_cpu__##var) ); \ | |
29 | (typeof(&per_cpu__##var)) (__ptr + (offset)); })) | |
30 | ||
31 | #endif | |
32 | ||
33 | #ifdef CONFIG_SMP | |
34 | ||
35 | extern unsigned long __per_cpu_offset[NR_CPUS]; | |
36 | ||
37 | /* Separate out the type, so (int[3], foo) works. */ | |
38 | #define DEFINE_PER_CPU(type, name) \ | |
39 | __attribute__((__section__(".data.percpu"))) \ | |
40 | __typeof__(type) per_cpu__##name | |
41 | ||
42 | #define __get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset) | |
43 | #define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu]) | |
44 | ||
45 | /* A macro to avoid #include hell... */ | |
46 | #define percpu_modcopy(pcpudst, src, size) \ | |
47 | do { \ | |
48 | unsigned int __i; \ | |
49 | for (__i = 0; __i < NR_CPUS; __i++) \ | |
50 | if (cpu_possible(__i)) \ | |
51 | memcpy((pcpudst)+__per_cpu_offset[__i], \ | |
52 | (src), (size)); \ | |
53 | } while (0) | |
54 | ||
55 | #else /* ! SMP */ | |
56 | ||
57 | #define DEFINE_PER_CPU(type, name) \ | |
58 | __typeof__(type) per_cpu__##name | |
59 | ||
60 | #define __get_cpu_var(var) __reloc_hide(var,0) | |
61 | #define per_cpu(var,cpu) __reloc_hide(var,0) | |
62 | ||
63 | #endif /* SMP */ | |
64 | ||
65 | #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name | |
66 | ||
67 | #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) | |
68 | #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) | |
69 | ||
70 | #endif /* __ARCH_S390_PERCPU__ */ |