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/* 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 (mike@next.com) * 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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