X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Fasm-parisc%2Fprefetch.h;fp=include%2Fasm-parisc%2Fprefetch.h;h=5d021726fa33a4950121b118ea1ce8ca5b26db2e;hb=76828883507a47dae78837ab5dec5a5b4513c667;hp=0000000000000000000000000000000000000000;hpb=64ba3f394c830ec48a1c31b53dcae312c56f1604;p=linux-2.6.git diff --git a/include/asm-parisc/prefetch.h b/include/asm-parisc/prefetch.h new file mode 100644 index 000000000..5d021726f --- /dev/null +++ b/include/asm-parisc/prefetch.h @@ -0,0 +1,39 @@ +/* + * 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 +extern 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 +extern 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 */