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
22extern 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
30extern 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