1 /* 2 * Copyright (c) 1992 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * %sccs.include.redist.c% 10 * 11 * @(#)sbusreg.h 7.1 (Berkeley) 07/13/92 12 * 13 * from: $Header: sbusreg.h,v 1.5 92/06/17 06:59:44 torek Exp $ (LBL) 14 */ 15 16 /* 17 * Sun-4c S-bus definitions. (Should be made generic!) 18 * 19 * Sbus slot 0 is not a separate slot; it talks to the onboard I/O devices. 20 * It is, however, addressed just like any `real' Sbus. 21 * 22 * Sbus device addresses are obtained from the FORTH PROMs. They come 23 * in `absolute' and `relative' address flavors, so we have to handle both. 24 * Relative addresses do *not* include the slot number. 25 */ 26 #define SBUS_BASE 0xf8000000 27 #define SBUS_ADDR(slot, off) (SBUS_BASE + ((slot) << 25) + (off)) 28 #define SBUS_ABS(a) ((unsigned)(a) >= SBUS_BASE) 29 #define SBUS_ABS_TO_SLOT(a) (((a) - SBUS_BASE) >> 25) 30 #define SBUS_ABS_TO_OFFSET(a) (((a) - SBUS_BASE) & 0x1ffffff) 31