[deliverable/linux.git] / arch / s390 / include / asm / percpu.h

#ifndef __ARCH_S390_PERCPU__
#define __ARCH_S390_PERCPU__

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

/*
 * 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 SHIFT_PERCPU_PTR(ptr,offset) (({			\
	extern int simple_identifier_##var(void);	\
	unsigned long *__ptr;				\
	asm ( "larl %0, %1@GOTENT"		\
	    : "=a" (__ptr) : "X" (ptr) );		\
	(typeof(ptr))((*__ptr) + (offset));	}))

#else

#define SHIFT_PERCPU_PTR(ptr, offset) (({				\
	extern int simple_identifier_##var(void);		\
	unsigned long __ptr;					\
	asm ( "" : "=a" (__ptr) : "0" (ptr) );			\
	(typeof(ptr)) (__ptr + (offset)); }))

#endif

#define __my_cpu_offset S390_lowcore.percpu_offset

#include <asm-generic/percpu.h>

#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
1da177e4 LT	7	/*
	8	* s390 uses its own implementation for per cpu data, the offset of
	9	* the cpu local data area is cached in the cpu's lowcore memory.
	10	* For 64 bit module code s390 forces the use of a GOT slot for the
	11	* address of the per cpu variable. This is needed because the module
	12	* may be more than 4G above the per cpu area.
	13	*/
	14	#if defined(__s390x__) && defined(MODULE)
	15
f0343474	16	#define SHIFT_PERCPU_PTR(ptr,offset) (({ \
a666ecfb	17	extern int simple_identifier_##var(void); \
632bbfee	18	unsigned long *__ptr; \
f0343474	19	asm ( "larl %0, %1@GOTENT" \
	20	: "=a" (__ptr) : "X" (ptr) ); \
	21	(typeof(ptr))((*__ptr) + (offset)); }))
1da177e4 LT	22
	23	#else
	24
f0343474	25	#define SHIFT_PERCPU_PTR(ptr, offset) (({ \
a666ecfb	26	extern int simple_identifier_##var(void); \
632bbfee	27	unsigned long __ptr; \
f0343474	28	asm ( "" : "=a" (__ptr) : "0" (ptr) ); \
f0343474	29	(typeof(ptr)) (__ptr + (offset)); }))
1da177e4 LT	30
	31	#endif
	32
f0343474	33	#define __my_cpu_offset S390_lowcore.percpu_offset
1da177e4	34
f0343474	35	#include <asm-generic/percpu.h>
1da177e4	36
1da177e4	37	#endif /* __ARCH_S390_PERCPU__ */