diff --git a/include/asm-s390/extmem.h b/include/asm-s390/extmem.h
new file mode 100644
index 0000000..c8802c9
--- /dev/null
+++ b/include/asm-s390/extmem.h
@@ -0,0 +1,32 @@
+/*
+ *  include/asm-s390x/extmem.h
+ *
+ *  definitions for external memory segment support
+ *  Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ */
+
+#ifndef _ASM_S390X_DCSS_H
+#define _ASM_S390X_DCSS_H
+#ifndef __ASSEMBLY__
+
+/* possible values for segment type as returned by segment_info */
+#define SEG_TYPE_SW 0
+#define SEG_TYPE_EW 1
+#define SEG_TYPE_SR 2
+#define SEG_TYPE_ER 3
+#define SEG_TYPE_SN 4
+#define SEG_TYPE_EN 5
+#define SEG_TYPE_SC 6
+#define SEG_TYPE_EWEN 7
+
+#define SEGMENT_SHARED 0
+#define SEGMENT_EXCLUSIVE 1
+
+extern int segment_load (char *name,int segtype,unsigned long *addr,unsigned long *length);
+extern void segment_unload(char *name);
+extern void segment_save(char *name);
+extern int segment_type (char* name);
+extern int segment_modify_shared (char *name, int do_nonshared);
+
+#endif
+#endif