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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
35extern 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 __raw_get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
44#define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu])
45#define per_cpu_offset(x) (__per_cpu_offset[x])
46
47/* A macro to avoid #include hell... */
48#define percpu_modcopy(pcpudst, src, size) \
49do { \
50 unsigned int __i; \
51 for_each_possible_cpu(__i) \
52 memcpy((pcpudst)+__per_cpu_offset[__i], \
53 (src), (size)); \
54} while (0)
55
56#else /* ! SMP */
57
58#define DEFINE_PER_CPU(type, name) \
59 __typeof__(type) per_cpu__##name
60
61#define __get_cpu_var(var) __reloc_hide(var,0)
62#define __raw_get_cpu_var(var) __reloc_hide(var,0)
63#define per_cpu(var,cpu) __reloc_hide(var,0)
64
65#endif /* SMP */
66
67#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
68
69#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
70#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
71
72#endif /* __ARCH_S390_PERCPU__ */