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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
Jan Blunck632bbfe2006-09-25 23:30:53 -070018#define __reloc_hide(var,offset) (*({ \
Jan Bluncka666ecf2006-10-06 00:43:58 -070019 extern int simple_identifier_##var(void); \
Jan Blunck632bbfe2006-09-25 23:30:53 -070020 unsigned long *__ptr; \
21 asm ( "larl %0,per_cpu__"#var"@GOTENT" \
22 : "=a" (__ptr) : "X" (per_cpu__##var) ); \
23 (typeof(&per_cpu__##var))((*__ptr) + (offset)); }))
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25#else
26
Jan Blunck632bbfe2006-09-25 23:30:53 -070027#define __reloc_hide(var, offset) (*({ \
Jan Bluncka666ecf2006-10-06 00:43:58 -070028 extern int simple_identifier_##var(void); \
Jan Blunck632bbfe2006-09-25 23:30:53 -070029 unsigned long __ptr; \
30 asm ( "" : "=a" (__ptr) : "0" (&per_cpu__##var) ); \
31 (typeof(&per_cpu__##var)) (__ptr + (offset)); }))
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33#endif
34
35#ifdef CONFIG_SMP
36
37extern unsigned long __per_cpu_offset[NR_CPUS];
38
39/* Separate out the type, so (int[3], foo) works. */
40#define DEFINE_PER_CPU(type, name) \
41 __attribute__((__section__(".data.percpu"))) \
42 __typeof__(type) per_cpu__##name
43
44#define __get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
Paul Mackerrasbfe5d832006-06-25 05:47:14 -070045#define __raw_get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu])
Ingo Molnara875a692006-07-03 00:24:26 -070047#define per_cpu_offset(x) (__per_cpu_offset[x])
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49/* A macro to avoid #include hell... */
50#define percpu_modcopy(pcpudst, src, size) \
51do { \
52 unsigned int __i; \
KAMEZAWA Hiroyuki97db7fb2006-03-31 02:30:26 -080053 for_each_possible_cpu(__i) \
Andrew Morton394e3902006-03-23 03:01:05 -080054 memcpy((pcpudst)+__per_cpu_offset[__i], \
55 (src), (size)); \
Linus Torvalds1da177e2005-04-16 15:20:36 -070056} while (0)
57
58#else /* ! SMP */
59
60#define DEFINE_PER_CPU(type, name) \
61 __typeof__(type) per_cpu__##name
62
63#define __get_cpu_var(var) __reloc_hide(var,0)
Paul Mackerrasbfe5d832006-06-25 05:47:14 -070064#define __raw_get_cpu_var(var) __reloc_hide(var,0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#define per_cpu(var,cpu) __reloc_hide(var,0)
66
67#endif /* SMP */
68
69#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
70
71#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
72#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
73
74#endif /* __ARCH_S390_PERCPU__ */