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Annotation of researchv9/sys/boot/stand/xt.c, revision 1.1

1.1     ! root        1: #ifndef XTBOOT
        !             2: #ifndef lint
        !             3: static char sccsid[] = "@(#)xt.c       1.1 86/02/03    Copyr 1985 Sun Micro";
        !             4: #endif
        !             5: #endif
        !             6: 
        !             7: /*
        !             8:  * Copyright (c) 1985 by Sun Microsystems, Inc.
        !             9:  */
        !            10: 
        !            11: /*
        !            12:  * Standalone driver for Xylogics 472 Tape Controller
        !            13:  */
        !            14: 
        !            15: #include "saio.h"
        !            16: #include "../sundev/xycreg.h"
        !            17: #include "../sundev/xtreg.h"
        !            18: 
        !            19: 
        !            20: #define NXTADDR        2
        !            21: unsigned long xtaddrs[] = { 0xEE60, 0xEE68 };
        !            22: 
        !            23: #define MAXXTREC       (20*1024)       /* max size tape rec allowed */
        !            24: 
        !            25: struct xtdma {
        !            26:        struct xtiopb   xtiopb;
        !            27:        char            xtblock[MAXXTREC];
        !            28: };
        !            29: 
        !            30: /* Define resources needed by this driver */
        !            31: struct devinfo xtinfo = {
        !            32:        sizeof(struct xydevice), sizeof (struct xtdma), 0,
        !            33:        NXTADDR, xtaddrs, MAP_MBIO,
        !            34:        MAXXTREC,
        !            35: };
        !            36: 
        !            37: int    xtstrategy(), xtopen(), xtclose();
        !            38: extern int     nullsys(), ttboot();
        !            39: 
        !            40: struct boottab xtdriver = {
        !            41:        "xt",   nullsys, ttboot, xtopen, xtclose, xtstrategy,
        !            42:        "xt: Xylogics 472 tape",        &xtinfo,
        !            43: };
        !            44: 
        !            45: xtopen(sip)
        !            46:        register struct saioreq *sip;
        !            47: {
        !            48:        register skip;
        !            49:        register struct xydevice *xyaddr;
        !            50: 
        !            51:        xyaddr = (struct xydevice *) sip->si_devaddr;
        !            52:        if (pokec((char *)xyaddr, 0))
        !            53:                return (-1);
        !            54:        skip = xyaddr->xy_resupd;       /* controller reset */
        !            55:        xtcmd(sip, XT_SEEK, XT_REW);
        !            56:        skip = sip->si_boff;
        !            57:        while (skip--) {
        !            58:                sip->si_cc = 0;
        !            59:                xtcmd(sip, XT_SEEK, XT_FILE);
        !            60:        }
        !            61:        return (0);
        !            62: }
        !            63: 
        !            64: xtclose(sip)
        !            65:        register struct saioreq *sip;
        !            66: {
        !            67: 
        !            68:        xtcmd(sip, XT_SEEK, XT_REW);
        !            69: }
        !            70: 
        !            71: xtstrategy(sip, rw)
        !            72:        struct saioreq *sip;
        !            73:        int rw;
        !            74: {
        !            75:        int func = (rw == WRITE) ? XT_WRITE : XT_READ;
        !            76: 
        !            77:        return xtcmd(sip, func, 0);
        !            78: }
        !            79: 
        !            80: xtcmd(sip, func, subfunc)
        !            81:        register struct saioreq *sip;
        !            82: {
        !            83:        register struct xtiopb *xt = &((struct xtdma *)sip->si_dmaaddr)->xtiopb;
        !            84:        register struct xydevice *xyaddr = (struct xydevice *)sip->si_devaddr;
        !            85:        char *xtbuf = ((struct xtdma *)sip->si_dmaaddr)->xtblock;
        !            86:        int err, t;
        !            87: 
        !            88:        bzero((char *)xt, sizeof (struct xtiopb));
        !            89:        xt->xt_reloc = 1;
        !            90:        xt->xt_autoup = 1;
        !            91:        xt->xt_cmd = func;
        !            92:        xt->xt_subfunc = subfunc;
        !            93:        xt->xt_unit = sip->si_unit & 3;
        !            94:        xt->xt_throttle = 5;
        !            95:        switch (func) {
        !            96: 
        !            97:        case XT_READ:
        !            98:                xt->xt_cnt = sip->si_cc;
        !            99:                xt->xt_swab = 1;
        !           100:                xt->xt_retry = 1;
        !           101:                break;
        !           102: 
        !           103:        case XT_WRITE:
        !           104:                xt->xt_cnt = sip->si_cc;
        !           105:                bcopy((char *)sip->si_ma, xtbuf, xt->xt_cnt);
        !           106:                xt->xt_swab = 1;
        !           107:                xt->xt_retry = 1;
        !           108:                break;
        !           109: 
        !           110:        default:
        !           111:                xt->xt_cnt = 1;
        !           112:                break;
        !           113:        }
        !           114:        xt->xt_bufoff = XYOFF(xtbuf);
        !           115:        xt->xt_bufrel = XYREL(xyaddr, xtbuf);
        !           116: 
        !           117:        t = XYREL(xyaddr, (char *)xt);
        !           118:        xyaddr->xy_iopbrel[0] = t >> 8;
        !           119:        xyaddr->xy_iopbrel[1] = t;
        !           120:        xyaddr->xy_iopboff[0] = ((int)xt) >> 8;
        !           121:        xyaddr->xy_iopboff[1] = (int)xt;
        !           122:        xyaddr->xy_csr = XY_GO;
        !           123: 
        !           124:        do {
        !           125:                DELAY(30);
        !           126:        } while (xyaddr->xy_csr & XY_BUSY);
        !           127:        err = xt->xt_errno;
        !           128: 
        !           129:        if (err != XTE_NOERROR && err != XTE_SHORTREC && err != XTE_LONGREC) {
        !           130:                if (err == XTE_EOF || err == XTE_EOT)
        !           131:                        return (0);
        !           132:                /* Note: controller does retries for us */
        !           133:                printf("xt hard err %x\n", err);
        !           134:                return (-1);
        !           135:        }
        !           136:        if (func == XT_READ)
        !           137:                bcopy(xtbuf, (char *)sip->si_ma, xt->xt_acnt);
        !           138:        return (xt->xt_acnt);
        !           139: }

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