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Annotation of GNUtools/cctools/include/architecture/nrw/reg_help.h, revision 1.1

1.1     ! root        1: /* Copyright (c) 1991 NeXT Computer, Inc.  All rights reserved.
        !             2:  *
        !             3:  *     File:   architecture/nrw/reg_help.h
        !             4:  *     Author: Mike DeMoney, NeXT Computer, Inc.
        !             5:  *
        !             6:  *     This header file defines cpp macros useful for defining
        !             7:  *     machine register and doing machine-level operations.
        !             8:  *
        !             9:  * HISTORY
        !            10:  * 23-Jan-91  Mike DeMoney ([email protected])
        !            11:  *     Created.
        !            12:  */
        !            13: 
        !            14: #ifndef        _NRW_REG_HELP_H_
        !            15: #define        _NRW_REG_HELP_H_
        !            16: 
        !            17: /* Bitfield definition aid */
        !            18: #define        BITS_WIDTH(msb, lsb)    ((msb)-(lsb)+1)
        !            19: #define        BIT_WIDTH(pos)          (1)     /* mostly to record the position */
        !            20: 
        !            21: /* Mask creation */
        !            22: #define        MKMASK(width, offset)   (((unsigned)-1)>>(32-(width))<<(offset))
        !            23: #define        BITSMASK(msb, lsb)      MKMASK(BITS_WIDTH(msb, lsb), lsb & 0x1f)
        !            24: #define        BITMASK(pos)            MKMASK(BIT_WIDTH(pos), pos & 0x1f)
        !            25: 
        !            26: /* Register addresses */
        !            27: #if    __ASSEMBLER__
        !            28: # define       REG_ADDR(type, addr)    (addr)
        !            29: #else  __ASSEMBLER__
        !            30: # define       REG_ADDR(type, addr)    (*(volatile type *)(addr))
        !            31: #endif __ASSEMBLER__
        !            32: 
        !            33: /* Cast a register to be an unsigned */
        !            34: #define        CONTENTS(foo)   (*(unsigned *) &(foo))
        !            35: 
        !            36: /* STRINGIFY -- perform all possible substitutions, then stringify */
        !            37: #define        __STR(x)        #x              /* just a helper macro */
        !            38: #define        STRINGIFY(x)    __STR(x)
        !            39: 
        !            40: 
        !            41: #endif _NRW_REG_HELP_H_

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