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-rw-r--r--include/asm-powerpc/synch.h51
1 files changed, 51 insertions, 0 deletions
diff --git a/include/asm-powerpc/synch.h b/include/asm-powerpc/synch.h
new file mode 100644
index 000000000000..4660c0394a77
--- /dev/null
+++ b/include/asm-powerpc/synch.h
@@ -0,0 +1,51 @@
+#ifndef _ASM_POWERPC_SYNCH_H
+#define _ASM_POWERPC_SYNCH_H
+
+#include <linux/config.h>
+
+#ifdef __powerpc64__
+#define __SUBARCH_HAS_LWSYNC
+#endif
+
+#ifdef __SUBARCH_HAS_LWSYNC
+# define LWSYNC lwsync
+#else
+# define LWSYNC sync
+#endif
+
+
+/*
+ * Arguably the bitops and *xchg operations don't imply any memory barrier
+ * or SMP ordering, but in fact a lot of drivers expect them to imply
+ * both, since they do on x86 cpus.
+ */
+#ifdef CONFIG_SMP
+#define EIEIO_ON_SMP "eieio\n"
+#define ISYNC_ON_SMP "\n\tisync"
+#define SYNC_ON_SMP __stringify(LWSYNC) "\n"
+#else
+#define EIEIO_ON_SMP
+#define ISYNC_ON_SMP
+#define SYNC_ON_SMP
+#endif
+
+static inline void eieio(void)
+{
+ __asm__ __volatile__ ("eieio" : : : "memory");
+}
+
+static inline void isync(void)
+{
+ __asm__ __volatile__ ("isync" : : : "memory");
+}
+
+#ifdef CONFIG_SMP
+#define eieio_on_smp() eieio()
+#define isync_on_smp() isync()
+#else
+#define eieio_on_smp() __asm__ __volatile__("": : :"memory")
+#define isync_on_smp() __asm__ __volatile__("": : :"memory")
+#endif
+
+#endif /* _ASM_POWERPC_SYNCH_H */
+