1 files changed, 40 insertions, 0 deletions

diff --git a/arch/sh/include/asm/uncached.h b/arch/sh/include/asm/uncached.h
index e3419f96626a..6f8816b79cf1 100644
--- a/arch/sh/include/asm/uncached.h
+++ b/arch/sh/include/asm/uncached.h
@@ -4,15 +4,55 @@
 #include <linux/bug.h>
 
 #ifdef CONFIG_UNCACHED_MAPPING
+extern unsigned long cached_to_uncached;
+extern unsigned long uncached_size;
 extern unsigned long uncached_start, uncached_end;
 
 extern int virt_addr_uncached(unsigned long kaddr);
 extern void uncached_init(void);
 extern void uncached_resize(unsigned long size);
+
+/*
+ * Jump to uncached area.
+ * When handling TLB or caches, we need to do it from an uncached area.
+ */
+#define jump_to_uncached()                      \
+do {                                            \
+        unsigned long __dummy;                  \
+                                                \
+        __asm__ __volatile__(                   \
+                "mova   1f, %0\n\t"             \
+                "add    %1, %0\n\t"             \
+                "jmp    @%0\n\t"                \
+                " nop\n\t"                      \
+                ".balign 4\n"                   \
+                "1:"                            \
+                : "=&z" (__dummy)               \
+                : "r" (cached_to_uncached));    \
+} while (0)
+
+/*
+ * Back to cached area.
+ */
+#define back_to_cached()                                \
+do {                                                    \
+        unsigned long __dummy;                          \
+        ctrl_barrier();                                 \
+        __asm__ __volatile__(                           \
+                "mov.l  1f, %0\n\t"                     \
+                "jmp    @%0\n\t"                        \
+                " nop\n\t"                              \
+                ".balign 4\n"                           \
+                "1:     .long 2f\n"                     \
+                "2:"                                    \
+                : "=&r" (__dummy));                     \
+} while (0)
 #else
 #define virt_addr_uncached(kaddr)       (0)
 #define uncached_init()                 do { } while (0)
 #define uncached_resize(size)           BUG()
+#define jump_to_uncached()              do { } while (0)
+#define back_to_cached()                do { } while (0)
 #endif
 
 #endif /* __ASM_SH_UNCACHED_H */