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authorKyle McMartin <kyle@parisc-linux.org>2006-08-13 20:37:26 -0400
committerMatthew Wilcox <willy@parisc-linux.org>2006-10-04 06:44:58 -0600
commit32104b29cdf93f78ac37e681bd4547413466d13c (patch)
tree4b058cad9227dd960da79daf94235517690f9197 /include/asm-parisc/prefetch.h
parent4068d93cd17561bcbfc821c831cb048385320bd6 (diff)
downloadop-kernel-dev-32104b29cdf93f78ac37e681bd4547413466d13c.zip
op-kernel-dev-32104b29cdf93f78ac37e681bd4547413466d13c.tar.gz
[PARISC] PA7200 also supports prefetch for read
It seems PA7200 processors also suppress traps on loads to %r0. This means we can prefetch for read on these cpus. Of course, we can't support prefetch for write, since that requires LOAD DOUBLEWORD which was added with PA2.0 Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
Diffstat (limited to 'include/asm-parisc/prefetch.h')
-rw-r--r--include/asm-parisc/prefetch.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-parisc/prefetch.h b/include/asm-parisc/prefetch.h
index f5a2e7a..5d02172 100644
--- a/include/asm-parisc/prefetch.h
+++ b/include/asm-parisc/prefetch.h
@@ -24,11 +24,14 @@ extern 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
extern inline void prefetchw(const void *addr)
{
__asm__("ldd 0(%0), %%r0" : : "r" (addr));
}
+#endif /* CONFIG_PA20 */
#endif /* CONFIG_PREFETCH */
#endif /* __ASSEMBLY__ */
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