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	extern int simple_identifier_##var(void);	\
20	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));	}))
24
25#else
26
27#define __reloc_hide(var, offset) (*({				\
28	extern int simple_identifier_##var(void);		\
29	unsigned long __ptr;					\
30	asm ( "" : "=a" (__ptr) : "0" (&per_cpu__##var) );	\
31	(typeof(&per_cpu__##var)) (__ptr + (offset)); }))
32
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)
45#define __raw_get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
46#define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu])
47#define per_cpu_offset(x) (__per_cpu_offset[x])
48
49/* A macro to avoid #include hell... */
50#define percpu_modcopy(pcpudst, src, size)			\
51do {								\
52	unsigned int __i;					\
53	for_each_possible_cpu(__i)				\
54		memcpy((pcpudst)+__per_cpu_offset[__i],		\
55		       (src), (size));				\
56} 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)
64#define __raw_get_cpu_var(var) __reloc_hide(var,0)
65#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__ */
75