1/*
2 * Copyright (c) 2004, Apple Computer, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1.  Redistributions of source code must retain the above copyright
8 *     notice, this list of conditions and the following disclaimer.
9 * 2.  Redistributions in binary form must reproduce the above copyright
10 *     notice, this list of conditions and the following disclaimer in the
11 *     documentation and/or other materials provided with the distribution.
12 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
13 *     its contributors may be used to endorse or promote products derived
14 *     from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
25 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28/* Copyright (c) 1991 NeXT Computer, Inc.  All rights reserved.
29 *
30 *	File:	architecture/nrw/reg_help.h
31 *	Author:	Mike DeMoney, NeXT Computer, Inc.
32 *
33 *	This header file defines cpp macros useful for defining
34 *	machine register and doing machine-level operations.
35 *
36 * HISTORY
37 * 23-Jan-91  Mike DeMoney (mike@next.com)
38 *	Created.
39 */
40
41#ifndef	_NRW_REG_HELP_H_
42#define	_NRW_REG_HELP_H_
43
44/* Bitfield definition aid */
45#define	BITS_WIDTH(msb, lsb)	((msb)-(lsb)+1)
46#define	BIT_WIDTH(pos)		(1)	/* mostly to record the position */
47
48/* Mask creation */
49#define	MKMASK(width, offset)	(((unsigned)-1)>>(32-(width))<<(offset))
50#define	BITSMASK(msb, lsb)	MKMASK(BITS_WIDTH(msb, lsb), lsb & 0x1f)
51#define	BITMASK(pos)		MKMASK(BIT_WIDTH(pos), pos & 0x1f)
52
53/* Register addresses */
54#if	__ASSEMBLER__
55# define	REG_ADDR(type, addr)	(addr)
56#else	/* __ASSEMBLER__ */
57# define	REG_ADDR(type, addr)	(*(volatile type *)(addr))
58#endif	/* __ASSEMBLER__ */
59
60/* Cast a register to be an unsigned */
61#define	CONTENTS(foo)	(*(unsigned *) &(foo))
62
63/* STRINGIFY -- perform all possible substitutions, then stringify */
64#define	__STR(x)	#x		/* just a helper macro */
65#define	STRINGIFY(x)	__STR(x)
66
67
68#endif	/* _NRW_REG_HELP_H_ */
69