[net-next-2.6.git] / arch / parisc / include / asm / prefetch.h

/*
 * include/asm-parisc/prefetch.h
 *
 * PA 2.0 defines data prefetch instructions on page 6-11 of the Kane book.
 * In addition, many implementations do hardware prefetching of both
 * instructions and data.
 *
 * PA7300LC (page 14-4 of the ERS) also implements prefetching by a load
 * to gr0 but not in a way that Linux can use.  If the load would cause an
 * interruption (eg due to prefetching 0), it is suppressed on PA2.0
 * processors, but not on 7300LC.
 *
 */

#ifndef __ASM_PARISC_PREFETCH_H
#define __ASM_PARISC_PREFETCH_H

#ifndef __ASSEMBLY__
#ifdef CONFIG_PREFETCH

#define ARCH_HAS_PREFETCH
static inline void prefetch(const void *addr)
{
	__asm__("ldw 0(%0), %%r0" : : "r" (addr));
}

/* LDD is a PA2.0 addition. */
#ifdef CONFIG_PA20
#define ARCH_HAS_PREFETCHW
static inline void prefetchw(const void *addr)
{
	__asm__("ldd 0(%0), %%r0" : : "r" (addr));
}
#endif /* CONFIG_PA20 */

#endif /* CONFIG_PREFETCH */
#endif /* __ASSEMBLY__ */

#endif /* __ASM_PARISC_PROCESSOR_H */
Commit	Line	Data
4068d93c KM	1	/*
	2	* include/asm-parisc/prefetch.h
	3	*
	4	* PA 2.0 defines data prefetch instructions on page 6-11 of the Kane book.
	5	* In addition, many implementations do hardware prefetching of both
	6	* instructions and data.
	7	*
	8	* PA7300LC (page 14-4 of the ERS) also implements prefetching by a load
	9	* to gr0 but not in a way that Linux can use. If the load would cause an
	10	* interruption (eg due to prefetching 0), it is suppressed on PA2.0
	11	* processors, but not on 7300LC.
	12	*
	13	*/
	14
	15	#ifndef __ASM_PARISC_PREFETCH_H
	16	#define __ASM_PARISC_PREFETCH_H
	17
	18	#ifndef __ASSEMBLY__
	19	#ifdef CONFIG_PREFETCH
	20
	21	#define ARCH_HAS_PREFETCH
f13cec84	22	static inline void prefetch(const void *addr)
4068d93c KM	23	{
	24	__asm__("ldw 0(%0), %%r0" : : "r" (addr));
	25	}
	26
32104b29 KM	27	/* LDD is a PA2.0 addition. */
32104b29 KM	28	#ifdef CONFIG_PA20
4068d93c	29	#define ARCH_HAS_PREFETCHW
f13cec84	30	static inline void prefetchw(const void *addr)
4068d93c KM	31	{
	32	__asm__("ldd 0(%0), %%r0" : : "r" (addr));
	33	}
32104b29	34	#endif /* CONFIG_PA20 */
4068d93c KM	35
	36	#endif /* CONFIG_PREFETCH */
	37	#endif /* __ASSEMBLY__ */
	38
	39	#endif /* __ASM_PARISC_PROCESSOR_H */