diff options
| author | Kyle McMartin <kyle@mcmartin.ca> | 2008-07-28 23:02:13 -0400 |
|---|---|---|
| committer | Kyle McMartin <kyle@hera.kernel.org> | 2008-10-10 16:32:29 +0000 |
| commit | deae26bf6a10e47983606f5df080b91e97650ead (patch) | |
| tree | 84a8a68145d0f713d7c5a1f9e6b3b03be9b3a4c8 /arch/parisc/include/asm/prefetch.h | |
| parent | 6c86cb8237bf08443806089130dc108051569a93 (diff) | |
parisc: move include/asm-parisc to arch/parisc/include/asm
Diffstat (limited to 'arch/parisc/include/asm/prefetch.h')
| -rw-r--r-- | arch/parisc/include/asm/prefetch.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/prefetch.h b/arch/parisc/include/asm/prefetch.h new file mode 100644 index 00000000000..c5edc60c059 --- /dev/null +++ b/arch/parisc/include/asm/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 +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 */ |