--- linux-2.6.3/include/asm-alpha/io.h.orig	2004-02-18 04:59:27.000000000 +0100
+++ linux-2.6.3/include/asm-alpha/io.h	2004-02-25 13:42:10.000000000 +0100
@@ -17,6 +17,7 @@
 #ifdef __KERNEL__
 #include <linux/config.h>
 #include <linux/kernel.h>
+#include <linux/mm.h>		/* for mem_map, used in page_to_pa */
 #include <asm/system.h>
 #include <asm/pgtable.h>
 #include <asm/machvec.h>
@@ -118,6 +119,15 @@
 	return (long)address <= 0 ? NULL : virt;
 }
 
+#define isa_virt_to_bus virt_to_bus
+#define isa_bus_to_virt bus_to_virt
+static inline unsigned long isa_page_to_bus(struct page *page)
+{
+	unsigned long phys = page_to_phys(page);
+	unsigned long bus = phys + __direct_map_base;
+	return phys <= __direct_map_size ? bus : 0;
+}
+
 #else /* !__KERNEL__ */
 
 /*