sh: prefetch()/prefetchw() support.

SH-2/3/4 are able to prefetch, add support for it..

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/asm-sh/processor.h b/include/asm-sh/processor.h
index eeb0f48bb99e..e99aff706cf7 100644
--- a/include/asm-sh/processor.h
+++ b/include/asm-sh/processor.h
@@ -266,5 +266,18 @@ extern unsigned long get_wchan(struct task_struct *p);
 #define cpu_sleep()     __asm__ __volatile__ ("sleep" : : : "memory")
 #define cpu_relax()     barrier()
 
+#if defined(CONFIG_CPU_SH2A) || defined(CONFIG_CPU_SH3) || \
+    defined(CONFIG_CPU_SH4)
+#define PREFETCH_STRIDE         L1_CACHE_BYTES
+#define ARCH_HAS_PREFETCH
+#define ARCH_HAS_PREFETCHW
+static inline void prefetch(void *x)
+{
+        __asm__ __volatile__ ("pref @%0\n\t" : : "r" (x) : "memory");
+}
+
+#define prefetchw(x)    prefetch(x)
+#endif
+
 #endif /* __KERNEL__ */
 #endif /* __ASM_SH_PROCESSOR_H */