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Annotation of Net2/arch/i386/isa/fdreg.h, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1991 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)fdreg.h     7.1 (Berkeley) 5/9/91
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * AT floppy controller registers and bitfields
        !            38:  */
        !            39: 
        !            40: /* uses NEC765 controller */
        !            41: #include "../i386/isa/ic/nec765.h"
        !            42: 
        !            43: /* registers */
        !            44: #define        fdout   2       /* Digital Output Register (W) */
        !            45: #define        FDO_FDSEL       0x01    /*  floppy device select */
        !            46: #define        FDO_FRST        0x04    /*  floppy controller reset */
        !            47: #define        FDO_FDMAEN      0x08    /*  enable floppy DMA and Interrupt */
        !            48: #define        FDO_MOEN0       0x10    /*  motor enable drive 0 */
        !            49: #define        FDO_MOEN1       0x20    /*  motor enable drive 1 */
        !            50: 
        !            51: #define        fdsts   4       /* NEC 765 Main Status Register (R) */
        !            52: #define        fddata  5       /* NEC 765 Data Register (R/W) */
        !            53: 
        !            54: #define        fdctl   7       /* Control Register (W) */
        !            55: #define        FDC_500KBPS     0x00    /* 500KBPS MFM drive transfer rate */
        !            56: #define        FDC_300KBPS     0x01    /* 300KBPS MFM drive transfer rate */
        !            57: #define        FDC_250KBPS     0x02    /* 250KBPS MFM drive transfer rate */
        !            58: #define        FDC_125KBPS     0x03    /* 125KBPS FM drive transfer rate */
        !            59: 
        !            60: #define        fdin    7       /* Digital Input Register (R) */
        !            61: #define        FDI_DCHG        0x80    /* diskette has been changed */
        !            62: 
        !            63: 

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