usr/src/sys/vax/if/if_dmc.h

/*
 * Copyright (c) 1982 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)if_dmc.h    6.4 (Berkeley) %G%
 */

/*
 * DMC-11 Interface
 */

struct dmcdevice {
        char    bsel0;
        char    bsel1;
        char    bsel2;
        char    bsel3;
        short   sel4;
        short   sel6;
};

/*
 * dmc software packet encapsulation.  This allows the dmc
 * link to be multiplexed among several protocols.
 * The first eight bytes of the dmc header are garbage,
 * since on a vax the uba has been known to mung these
 * bytes.  The next two bytes encapsulate packet type.
 */
struct dmc_header {
        char    dmc_buf[8];     /* space for uba on vax */
        short   dmc_type;       /* encapsulate packet type */
};

/* packet types */
#define DMC_IPTYPE      1
#define DMC_TRAILER     2
#define DMC_NTRAILER    16

/*
 * DMCMTU includes space for data (1024) +
 * protocol header (256) + trailer descriptor (4).
 * The software link encapsulation header (dmc_header)
 * is handled separately.
 */
#define DMCMTU  1284

#define RDYSCAN 16      /* loop delay for RDYI after RQI */

/* defines for bsel0 */
#define DMC_BACCI       0
#define DMC_CNTLI       1
#define DMC_PERR        2
#define DMC_BASEI       3
#define DMC_WRITE       0               /* transmit block */
#define DMC_READ        4               /* read block */
#define DMC_RQI         0040            /* port request bit */
#define DMC_IEI         0100            /* enable input interrupts */
#define DMC_RDYI        0200            /* port ready */
#define DMC0BITS        "\10\8RDI\7IEI\6RQI"

/* defines for bsel1 */
#define DMC_MCLR        0100            /* DMC11 Master Clear */
#define DMC_RUN         0200            /* clock running */
#define DMC1BITS        "\10\8RUN\7MCLR"

/* defines for bsel2 */
#define DMC_BACCO       0
#define DMC_CNTLO       1
#define DMC_OUX         0               /* transmit block */
#define DMC_OUR         4               /* read block */
#define DMC_IEO         0100            /* enable output interrupts */
#define DMC_RDYO        0200            /* port available */
#define DMC2BITS        "\10\8RDO\7IEO"

/* defines for CNTLI mode */
#define DMC_HDPLX       02000           /* half duplex DDCMP operation */
#define DMC_SEC         04000           /* half duplex secondary station */
#define DMC_MAINT       00400           /* enter maintenance mode */

/* defines for BACCI/O and BASEI mode */
#define DMC_XMEM        0140000         /* xmem bit position */
#define DMC_CCOUNT      0037777         /* character count mask */
#define DMC_RESUME      0002000         /* resume (BASEI only) */

/* defines for CNTLO */
#define DMC_CNTMASK     01777

#define DMC_DATACK      01
#define DMC_TIMEOUT     02
#define DMC_NOBUFS      04
#define DMC_MAINTREC    010
#define DMC_LOSTDATA    020
#define DMC_DISCONN     0100
#define DMC_START       0200
#define DMC_NEXMEM      0400
#define DMC_ERROR       01000

#define DMC_FATAL (DMC_ERROR|DMC_NEXMEM|DMC_START|DMC_LOSTDATA|DMC_MAINTREC)
#define CNTLO_BITS      \
   "\10\12ERROR\11NEXMEM\10START\7DISC\5LSTDATA\4MAINT\3NOBUF\2TIMEO\1DATACK"