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 22 static inline void prefetch(const void *addr) 23 { 24 __asm__( 25 #ifndef CONFIG_PA20 26 /* Need to avoid prefetch of NULL on PA7300LC */ 27 " extrw,u,= %0,31,32,%%r0\n" 28 #endif 29 " ldw 0(%0), %%r0" : : "r" (addr)); 30 } 31 32 /* LDD is a PA2.0 addition. */ 33 #ifdef CONFIG_PA20 34 #define ARCH_HAS_PREFETCHW 35 static inline void prefetchw(const void *addr) 36 { 37 __asm__("ldd 0(%0), %%r0" : : "r" (addr)); 38 } 39 #endif /* CONFIG_PA20 */ 40 41 #endif /* CONFIG_PREFETCH */ 42 #endif /* __ASSEMBLY__ */ 43 44 #endif /* __ASM_PARISC_PROCESSOR_H */ 45