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Annotation of 3BSD/sys/dev/dhdm.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *     DM-BB driver
        !             3:  */
        !             4: #include "../h/param.h"
        !             5: #include "../h/tty.h"
        !             6: #include "../h/conf.h"
        !             7: #include "../h/map.h"
        !             8: #include "../h/pte.h"
        !             9: #include "../h/uba.h"
        !            10: 
        !            11: #define        DMADDR  ((struct device *)(UBA0_DEV+0170500))
        !            12: 
        !            13: struct tty dh11[];
        !            14: int    ndh11;          /* Set by dh.c to number of lines */
        !            15: 
        !            16: #define        DONE    0200
        !            17: #define        SCENABL 040
        !            18: #define        CLSCAN  01000
        !            19: #define        TURNON  03      /* CD lead, line enable */
        !            20: #define        RQS     04      /* request to send */
        !            21: #define        TURNOFF 1       /* line enable only */
        !            22: #define        CARRIER 0100
        !            23: 
        !            24: struct device
        !            25: {
        !            26:        short   dmcsr;
        !            27:        short   dmlstat;
        !            28:        short   junk[2];
        !            29: };
        !            30: 
        !            31: /*
        !            32:  * Turn on the line associated with the (DH) device dev.
        !            33:  */
        !            34: dmopen(dev)
        !            35: {
        !            36:        register struct tty *tp;
        !            37:        register struct device *addr;
        !            38:        register d;
        !            39: 
        !            40:        d = minor(dev);
        !            41:        tp = &dh11[d];
        !            42:        addr = DMADDR;
        !            43:        addr += d>>4;
        !            44:        spl5();
        !            45:        addr->dmcsr = d&017;
        !            46:        addr->dmlstat = TURNON;
        !            47:        if (addr->dmlstat&CARRIER)
        !            48:                tp->t_state |= CARR_ON;
        !            49:        addr->dmcsr = IENABLE|SCENABL;
        !            50:        while ((tp->t_state&CARR_ON)==0)
        !            51:                sleep((caddr_t)&tp->t_rawq, TTIPRI);
        !            52:        spl0();
        !            53: }
        !            54: 
        !            55: /*
        !            56:  * Dump control bits into the DM registers.
        !            57:  */
        !            58: dmctl(dev, bits)
        !            59: {
        !            60:        register struct device *addr;
        !            61:        register d, s;
        !            62: 
        !            63:        d = minor(dev);
        !            64:        addr = DMADDR;
        !            65:        addr += d>>4;
        !            66:        s = spl5();
        !            67:        addr->dmcsr = d&017;
        !            68:        addr->dmlstat = bits;
        !            69:        addr->dmcsr = IENABLE|SCENABL;
        !            70:        splx(s);
        !            71: }
        !            72: 
        !            73: /*
        !            74:  * DM11 interrupt.
        !            75:  * Mainly, deal with carrier transitions.
        !            76:  */
        !            77: dmint(dev)
        !            78: {
        !            79:        register struct tty *tp;
        !            80:        register struct device *addr;
        !            81:        register d;
        !            82: 
        !            83:        d = minor(dev);
        !            84:        addr = DMADDR;
        !            85:        addr += d;
        !            86:        if (addr->dmcsr&DONE) {
        !            87:                tp = &dh11[(d<<4)+(addr->dmcsr&017)];
        !            88:                if (tp < &dh11[ndh11]) {
        !            89:                        wakeup((caddr_t)&tp->t_rawq);
        !            90:                        if ((addr->dmlstat&CARRIER)==0) {
        !            91:                                if ((tp->t_state&WOPEN)==0) {
        !            92:                                        signal(tp->t_pgrp, SIGHUP);
        !            93:                                        addr->dmlstat = 0;
        !            94:                                        flushtty(tp);
        !            95:                                }
        !            96:                                tp->t_state &= ~CARR_ON;
        !            97:                        } else
        !            98:                                tp->t_state |= CARR_ON;
        !            99:                }
        !           100:                addr->dmcsr = IENABLE|SCENABL;
        !           101:        }
        !           102: }
        !           103: 
        !           104: 
        !           105: 

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