usr/src/sys/sparc/sbus/sbusreg.h

/*
 * Copyright (c) 1992 The Regents of the University of California.
 * All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Lawrence Berkeley Laboratories.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)sbusreg.h   7.2 (Berkeley) %G%
 *
 * from: $Header: sbusreg.h,v 1.5 92/06/17 06:59:44 torek Exp $ (LBL)
 */

/*
 * Sun-4c S-bus definitions.  (Should be made generic!)
 *
 * Sbus slot 0 is not a separate slot; it talks to the onboard I/O devices.
 * It is, however, addressed just like any `real' Sbus.
 *
 * Sbus device addresses are obtained from the FORTH PROMs.  They come
 * in `absolute' and `relative' address flavors, so we have to handle both.
 * Relative addresses do *not* include the slot number.
 */
#define SBUS_BASE               0xf8000000
#define SBUS_ADDR(slot, off)    (SBUS_BASE + ((slot) << 25) + (off))
#define SBUS_ABS(a)             ((unsigned)(a) >= SBUS_BASE)
#define SBUS_ABS_TO_SLOT(a)     (((a) - SBUS_BASE) >> 25)
#define SBUS_ABS_TO_OFFSET(a)   (((a) - SBUS_BASE) & 0x1ffffff)