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GNU tools for NeXTSTEP 3.3

/* Copyright (c) 1991 NeXT Computer, Inc.  All rights reserved.
 *
 *	File:	architecture/nrw/reg_help.h
 *	Author:	Mike DeMoney, NeXT Computer, Inc.
 *
 *	This header file defines cpp macros useful for defining
 *	machine register and doing machine-level operations.
 *
 * HISTORY
 * 23-Jan-91  Mike DeMoney ([email protected])
 *	Created.
 */

#ifndef	_NRW_REG_HELP_H_
#define	_NRW_REG_HELP_H_

/* Bitfield definition aid */
#define	BITS_WIDTH(msb, lsb)	((msb)-(lsb)+1)
#define	BIT_WIDTH(pos)		(1)	/* mostly to record the position */

/* Mask creation */
#define	MKMASK(width, offset)	(((unsigned)-1)>>(32-(width))<<(offset))
#define	BITSMASK(msb, lsb)	MKMASK(BITS_WIDTH(msb, lsb), lsb & 0x1f)
#define	BITMASK(pos)		MKMASK(BIT_WIDTH(pos), pos & 0x1f)

/* Register addresses */
#if	__ASSEMBLER__
# define	REG_ADDR(type, addr)	(addr)
#else	__ASSEMBLER__
# define	REG_ADDR(type, addr)	(*(volatile type *)(addr))
#endif	__ASSEMBLER__

/* Cast a register to be an unsigned */
#define	CONTENTS(foo)	(*(unsigned *) &(foo))

/* STRINGIFY -- perform all possible substitutions, then stringify */
#define	__STR(x)	#x		/* just a helper macro */
#define	STRINGIFY(x)	__STR(x)


#endif	_NRW_REG_HELP_H_

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