LXR linux/arch/parisc/include/asm/prefetch.h

   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
  22static inline void prefetch(const void *addr)
  23{
  24        __asm__("ldw 0(%0), %%r0" : : "r" (addr));
  25}
  26
  27/* LDD is a PA2.0 addition. */
  28#ifdef CONFIG_PA20
  29#define ARCH_HAS_PREFETCHW
  30static inline void prefetchw(const void *addr)
  31{
  32        __asm__("ldd 0(%0), %%r0" : : "r" (addr));
  33}
  34#endif /* CONFIG_PA20 */
  35
  36#endif /* CONFIG_PREFETCH */
  37#endif /* __ASSEMBLY__ */
  38
  39#endif /* __ASM_PARISC_PROCESSOR_H */
  40