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45 lines
1.1 KiB
45 lines
1.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* include/asm-parisc/prefetch.h |
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* |
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* PA 2.0 defines data prefetch instructions on page 6-11 of the Kane book. |
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* In addition, many implementations do hardware prefetching of both |
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* instructions and data. |
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* |
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* PA7300LC (page 14-4 of the ERS) also implements prefetching by a load |
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* to gr0 but not in a way that Linux can use. If the load would cause an |
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* interruption (eg due to prefetching 0), it is suppressed on PA2.0 |
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* processors, but not on 7300LC. |
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* |
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*/ |
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#ifndef __ASM_PARISC_PREFETCH_H |
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#define __ASM_PARISC_PREFETCH_H |
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#ifndef __ASSEMBLY__ |
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#ifdef CONFIG_PREFETCH |
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#define ARCH_HAS_PREFETCH |
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static inline void prefetch(const void *addr) |
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{ |
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__asm__( |
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#ifndef CONFIG_PA20 |
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/* Need to avoid prefetch of NULL on PA7300LC */ |
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" extrw,u,= %0,31,32,%%r0\n" |
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#endif |
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" ldw 0(%0), %%r0" : : "r" (addr)); |
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} |
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/* LDD is a PA2.0 addition. */ |
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#ifdef CONFIG_PA20 |
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#define ARCH_HAS_PREFETCHW |
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static inline void prefetchw(const void *addr) |
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{ |
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__asm__("ldd 0(%0), %%r0" : : "r" (addr)); |
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} |
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#endif /* CONFIG_PA20 */ |
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#endif /* CONFIG_PREFETCH */ |
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#endif /* __ASSEMBLY__ */ |
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#endif /* __ASM_PARISC_PROCESSOR_H */
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