2 * include/asm-parisc/prefetch.h
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.
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.
15 #ifndef __ASM_PARISC_PREFETCH_H
16 #define __ASM_PARISC_PREFETCH_H
19 #ifdef CONFIG_PREFETCH
21 #define ARCH_HAS_PREFETCH
22 extern inline void prefetch(const void *addr)
24 __asm__("ldw 0(%0), %%r0" : : "r" (addr));
27 /* LDD is a PA2.0 addition. */
29 #define ARCH_HAS_PREFETCHW
30 extern inline void prefetchw(const void *addr)
32 __asm__("ldd 0(%0), %%r0" : : "r" (addr));
34 #endif /* CONFIG_PA20 */
36 #endif /* CONFIG_PREFETCH */
37 #endif /* __ASSEMBLY__ */
39 #endif /* __ASM_PARISC_PROCESSOR_H */