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/* SPDX-License-Identifier: GPL-2.0 */ /* * 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