[linux-block.git] / include / asm-s390 / percpu.h

#ifndef __ARCH_S390_PERCPU__
#define __ARCH_S390_PERCPU__

#include <linux/compiler.h>
#include <asm/lowcore.h>

#define __GENERIC_PER_CPU

/*
 * s390 uses its own implementation for per cpu data, the offset of
 * the cpu local data area is cached in the cpu's lowcore memory.
 * For 64 bit module code s390 forces the use of a GOT slot for the
 * address of the per cpu variable. This is needed because the module
 * may be more than 4G above the per cpu area.
 */
#if defined(__s390x__) && defined(MODULE)

#define __reloc_hide(var,offset) (*({			\
	extern int simple_indentifier_##var(void);	\
	unsigned long *__ptr;				\
	asm ( "larl %0,per_cpu__"#var"@GOTENT"		\
	    : "=a" (__ptr) : "X" (per_cpu__##var) );	\
	(typeof(&per_cpu__##var))((*__ptr) + (offset));	}))

#else

#define __reloc_hide(var, offset) (*({				\
	extern int simple_indentifier_##var(void);		\
	unsigned long __ptr;					\
	asm ( "" : "=a" (__ptr) : "0" (&per_cpu__##var) );	\
	(typeof(&per_cpu__##var)) (__ptr + (offset)); }))

#endif

#ifdef CONFIG_SMP

extern unsigned long __per_cpu_offset[NR_CPUS];

/* Separate out the type, so (int[3], foo) works. */
#define DEFINE_PER_CPU(type, name) \
    __attribute__((__section__(".data.percpu"))) \
    __typeof__(type) per_cpu__##name

#define __get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
#define __raw_get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
#define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu])
#define per_cpu_offset(x) (__per_cpu_offset[x])

/* A macro to avoid #include hell... */
#define percpu_modcopy(pcpudst, src, size)			\
do {								\
	unsigned int __i;					\
	for_each_possible_cpu(__i)				\
		memcpy((pcpudst)+__per_cpu_offset[__i],		\
		       (src), (size));				\
} while (0)

#else /* ! SMP */

#define DEFINE_PER_CPU(type, name) \
    __typeof__(type) per_cpu__##name

#define __get_cpu_var(var) __reloc_hide(var,0)
#define __raw_get_cpu_var(var) __reloc_hide(var,0)
#define per_cpu(var,cpu) __reloc_hide(var,0)

#endif /* SMP */

#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name

#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)

#endif /* __ARCH_S390_PERCPU__ */
Commit	Line	Data
1da177e4 LT	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
632bbfee JB	18	#define __reloc_hide(var,offset) (*({ \
	19	extern int simple_indentifier_##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)); }))
1da177e4 LT	24
	25	#else
	26
632bbfee JB	27	#define __reloc_hide(var, offset) (*({ \
	28	extern int simple_indentifier_##var(void); \
	29	unsigned long __ptr; \
	30	asm ( "" : "=a" (__ptr) : "0" (&per_cpu__##var) ); \
	31	(typeof(&per_cpu__##var)) (__ptr + (offset)); }))
1da177e4 LT	32
	33	#endif
	34
	35	#ifdef CONFIG_SMP
	36
	37	extern 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)
bfe5d834	45	#define __raw_get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
1da177e4	46	#define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu])
a875a69f	47	#define per_cpu_offset(x) (__per_cpu_offset[x])
1da177e4 LT	48
	49	/* A macro to avoid #include hell... */
	50	#define percpu_modcopy(pcpudst, src, size) \
	51	do { \
	52	unsigned int __i; \
97db7fbf	53	for_each_possible_cpu(__i) \
394e3902 AM	54	memcpy((pcpudst)+__per_cpu_offset[__i], \
394e3902 AM	55	(src), (size)); \
1da177e4 LT	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)
bfe5d834	64	#define __raw_get_cpu_var(var) __reloc_hide(var,0)
1da177e4 LT	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__ */