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diff --git a/include/asm-sparc/msi.h b/include/asm-sparc/msi.h
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+/* $Id: msi.h,v 1.3 1996/08/29 09:48:25 davem Exp $
+ * msi.h: Defines specific to the MBus - Sbus - Interface.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
+ */
+
+#ifndef _SPARC_MSI_H
+#define _SPARC_MSI_H
+
+/*
+ * Locations of MSI Registers.
+ */
+#define MSI_MBUS_ARBEN 0xe0001008 /* MBus Arbiter Enable register */
+
+/*
+ * Useful bits in the MSI Registers.
+ */
+#define MSI_ASYNC_MODE 0x80000000 /* Operate the MSI asynchronously */
+
+
+extern __inline__ void msi_set_sync(void)
+{
+ __asm__ __volatile__ ("lda [%0] %1, %%g3\n\t"
+ "andn %%g3, %2, %%g3\n\t"
+ "sta %%g3, [%0] %1\n\t" : :
+ "r" (MSI_MBUS_ARBEN),
+ "i" (ASI_M_CTL), "r" (MSI_ASYNC_MODE) : "g3");
+}
+
+#endif /* !(_SPARC_MSI_H) */
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