[deliverable/linux.git] / include / asm-x86_64 / percpu.h

#ifndef _ASM_X8664_PERCPU_H_
#define _ASM_X8664_PERCPU_H_
#include <linux/compiler.h>

/* Same as asm-generic/percpu.h, except that we store the per cpu offset
   in the PDA. Longer term the PDA and every per cpu variable
   should be just put into a single section and referenced directly
   from %gs */

#ifdef CONFIG_SMP

#include <asm/pda.h>

#define __per_cpu_offset(cpu) (cpu_pda[cpu].data_offset)
#define __my_cpu_offset() read_pda(data_offset)

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

/* var is in discarded region: offset to particular copy we want */
#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))

/* A macro to avoid #include hell... */
#define percpu_modcopy(pcpudst, src, size)			\
do {								\
	unsigned int __i;					\
	for (__i = 0; __i < NR_CPUS; __i++)			\
		if (cpu_possible(__i))				\
			memcpy((pcpudst)+__per_cpu_offset(__i),	\
			       (src), (size));			\
} while (0)

extern void setup_per_cpu_areas(void);

#else /* ! SMP */

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

#define per_cpu(var, cpu)			(*((void)(cpu), &per_cpu__##var))
#define __get_cpu_var(var)			per_cpu__##var

#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 /* _ASM_X8664_PERCPU_H_ */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ASM_X8664_PERCPU_H_
	2	#define _ASM_X8664_PERCPU_H_
	3	#include <linux/compiler.h>
	4
	5	/* Same as asm-generic/percpu.h, except that we store the per cpu offset
	6	in the PDA. Longer term the PDA and every per cpu variable
	7	should be just put into a single section and referenced directly
	8	from %gs */
	9
	10	#ifdef CONFIG_SMP
	11
	12	#include <asm/pda.h>
	13
	14	#define __per_cpu_offset(cpu) (cpu_pda[cpu].data_offset)
	15	#define __my_cpu_offset() read_pda(data_offset)
	16
	17	/* Separate out the type, so (int[3], foo) works. */
	18	#define DEFINE_PER_CPU(type, name) \
	19	__attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
	20
	21	/* var is in discarded region: offset to particular copy we want */
	22	#define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
	23	#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
	24
	25	/* A macro to avoid #include hell... */
	26	#define percpu_modcopy(pcpudst, src, size) \
	27	do { \
	28	unsigned int __i; \
	29	for (__i = 0; __i < NR_CPUS; __i++) \
	30	if (cpu_possible(__i)) \
	31	memcpy((pcpudst)+__per_cpu_offset(__i), \
	32	(src), (size)); \
	33	} while (0)
	34
	35	extern void setup_per_cpu_areas(void);
	36
	37	#else /* ! SMP */
	38
	39	#define DEFINE_PER_CPU(type, name) \
	40	__typeof__(type) per_cpu__##name
	41
11c80c83	42	#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
1da177e4 LT	43	#define __get_cpu_var(var) per_cpu__##var
	44
	45	#endif /* SMP */
	46
	47	#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
	48
	49	#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
	50	#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
	51
	52	#endif /* _ASM_X8664_PERCPU_H_ */