| /* |
| * 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__( |
| #ifndef CONFIG_PA20 |
| /* Need to avoid prefetch of NULL on PA7300LC */ |
| " extrw,u,= %0,31,32,%%r0\n" |
| #endif |
| " 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 */ |
