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diff --git a/i386/i386at/blitvar.h b/i386/i386at/blitvar.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/* **********************************************************************
+ File:         blitvar.h
+ Description:  Definitions used by Blit driver other than h/w definition.
+
+ $ Header: $
+
+ Copyright Ing. C. Olivetti & C. S.p.A. 1988, 1989.
+ All rights reserved.
+********************************************************************** */
+/*
+  Copyright 1988, 1989 by Olivetti Advanced Technology Center, Inc.,
+Cupertino, California.
+
+		All Rights Reserved
+
+  Permission to use, copy, modify, and distribute this software and
+its documentation for any purpose and without fee is hereby
+granted, provided that the above copyright notice appears in all
+copies and that both the copyright notice and this permission notice
+appear in supporting documentation, and that the name of Olivetti
+not be used in advertising or publicity pertaining to distribution
+of the software without specific, written prior permission.
+
+  OLIVETTI DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
+IN NO EVENT SHALL OLIVETTI BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
+CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
+NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUR OF OR IN CONNECTION
+WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include <i386at/blitreg.h>
+#include <sys/types.h>
+#include <mach/boolean.h>
+
+
+/* 
+ * This is how we use the Blit's graphics memory.  The frame buffer 
+ * goes at the front, and the rest is used for miscellaneous 
+ * allocations.  Users can use the "spare" memory, but they should do 
+ * an ioctl to find out which part of the memory is really free.
+ */
+
+struct blitmem {
+	union blitfb {
+		u_char mono_fb[BLIT_MONOFBSIZE];
+		u_char color_fb[1];	/* place-holder */
+	} fb;
+	u_char spare[BLIT_MEMSIZE - sizeof(union blitfb)];
+};
+
+
+/*
+ * Macro to get from blitdev pointer to monochrome framebuffer.
+ */
+#define       BLIT_MONOFB(blt, fbptr) \
+	{ struct blitmem *mymem = (struct blitmem *)((blt)->graphmem); \
+	fbptr = mymem->fb.mono_fb; \
+	}
+
+
+/* 
+ * Single-tile description that can be used to describe the entire 
+ * screen. 
+ */
+
+struct screen_descrip {
+	STRIPHEADER strip;
+	TILEDESC tile;
+};
+
+
+/* 
+ * Number of microseconds we're willing to wait for display processor 
+ * to load its command block.
+ */
+
+#define DP_RDYTIMEOUT			1000000
+
+
+/* 
+ * Conversion macros.
+ */
+
+#define VM_TO_ADDR786(vmaddr, blit_base) \
+	((int)(vmaddr) - (int)(blit_base))
+
+
+extern boolean_t blit_present();
+extern void blit_init();