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Annotation of 43BSDTahoe/sys/vax/rx50.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Chris Torek.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted
        !             9:  * provided that the above copyright notice and this paragraph are
        !            10:  * duplicated in all such forms and that any documentation,
        !            11:  * advertising materials, and other materials related to such
        !            12:  * distribution and use acknowledge that the software was developed
        !            13:  * by the University of California, Berkeley.  The name of the
        !            14:  * University may not be used to endorse or promote products derived
        !            15:  * from this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            17:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            18:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)rx50.c      7.1 (Berkeley) 7/9/88
        !            21:  */
        !            22: 
        !            23: #if VAX8200
        !            24: 
        !            25: /*
        !            26:  * Routines to handle the console RX50.
        !            27:  */
        !            28: 
        !            29: #include "param.h"
        !            30: #include "time.h"
        !            31: #include "kernel.h"
        !            32: #include "vmmac.h"
        !            33: #include "buf.h"
        !            34: #include "errno.h"
        !            35: #include "uio.h"
        !            36: 
        !            37: #include "cpu.h"
        !            38: #include "rx50reg.h"
        !            39: 
        !            40: struct rx50device rx50device;
        !            41: 
        !            42: #define        rx50unit(dev)   minor(dev)
        !            43: 
        !            44: struct rx50state {
        !            45:        short   rs_flags;       /* see below */
        !            46:        short   rs_drive;       /* current drive number */
        !            47:        u_int   rs_blkno;       /* current block number */
        !            48: } rx50state;
        !            49: 
        !            50: /* flags */
        !            51: #define        RS_0OPEN        0x01    /* drive 0 open -- must be first */
        !            52: #define        RS_1OPEN        0x02    /* drive 1 open -- must be second */
        !            53: #define        RS_BUSY         0x04    /* operation in progress */
        !            54: #define        RS_WANT         0x08    /* wakeup when done */
        !            55: #define        RS_DONE         0x20    /* I/O operation done */
        !            56: #define        RS_ERROR        0x40    /* error bit set at interrupt */
        !            57: 
        !            58: /*
        !            59:  * Open a console RX50.
        !            60:  */
        !            61: /*ARGSUSED*/
        !            62: rx50open(dev, flags)
        !            63:        dev_t dev;
        !            64:        int flags;
        !            65: {
        !            66:        int unit;
        !            67: 
        !            68:        /* only on 8200 (yet) */
        !            69:        if (cpu != VAX_8200 || (unit = rx50unit(dev)) >= 2)
        !            70:                return (ENXIO);
        !            71: 
        !            72:        /* enforce exclusive access */
        !            73:        if (rx50state.rs_flags & (1 << unit))
        !            74:                return (EBUSY);
        !            75:        rx50state.rs_flags |= 1 << unit;
        !            76:        return (0);
        !            77: }
        !            78: 
        !            79: /*
        !            80:  * Close a console RX50.
        !            81:  */
        !            82: /*ARGSUSED*/
        !            83: rx50close(dev, flags)
        !            84:        dev_t dev;
        !            85:        int flags;
        !            86: {
        !            87: 
        !            88:        rx50state.rs_flags &= ~(1 << dev);      /* atomic */
        !            89: }
        !            90: 
        !            91: /*
        !            92:  * Perform a read (rw==UIO_READ) or write (rw==UIO_WRITE).
        !            93:  */
        !            94: rx50operation(dev, rw, uio)
        !            95:        dev_t dev;
        !            96:        enum uio_rw rw;
        !            97:        register struct uio *uio;
        !            98: {
        !            99:        register struct rx50device *rxaddr;
        !           100:        register struct rx50state *rs;
        !           101:        register char *cp;
        !           102:        register int error, i, t;
        !           103:        char secbuf[512];
        !           104:        static char driveselect[2] = { RXCMD_DRIVE0, RXCMD_DRIVE1 };
        !           105: 
        !           106:        /* enforce whole-sector I/O */
        !           107:        if ((uio->uio_offset & 511) || (uio->uio_resid & 511))
        !           108:                return (EINVAL);
        !           109: 
        !           110:        rs = &rx50state;
        !           111: 
        !           112:        /* lock out others */
        !           113:        i = spl4();
        !           114:        while (rs->rs_flags & RS_BUSY) {
        !           115:                rs->rs_flags |= RS_WANT;
        !           116:                sleep((caddr_t) &rx50state, PZERO - 1);
        !           117:        }
        !           118:        rs->rs_flags |= RS_BUSY;
        !           119:        rs->rs_drive = rx50unit(dev);
        !           120:        splx(i);
        !           121: 
        !           122:        rxaddr = &rx50device;
        !           123:        error = 0;
        !           124: 
        !           125:        while (uio->uio_resid) {
        !           126:                rs->rs_blkno = uio->uio_offset >> 9;
        !           127:                if (rs->rs_blkno >= RX50MAXSEC) {
        !           128:                        if (rs->rs_blkno > RX50MAXSEC)
        !           129:                                error = EINVAL;
        !           130:                        else if (rw == UIO_WRITE)
        !           131:                                error = ENOSPC;
        !           132:                        /* else ``eof'' */
        !           133:                        break;
        !           134:                }
        !           135:                rs->rs_flags &= ~(RS_ERROR | RS_DONE);
        !           136:                if (rw == UIO_WRITE) {
        !           137:                        /* copy the data to the RX50 silo */
        !           138:                        error = uiomove(secbuf, 512, UIO_WRITE, uio);
        !           139:                        if (error)
        !           140:                                break;
        !           141:                        i = rxaddr->rxrda;
        !           142:                        for (cp = secbuf, i = 512; --i >= 0;)
        !           143:                                rxaddr->rxfdb = *cp++;
        !           144:                        i = RXCMD_WRITE;
        !           145:                } else
        !           146:                        i = RXCMD_READ;
        !           147:                rxaddr->rxcmd = i | driveselect[rs->rs_drive];
        !           148:                i = rs->rs_blkno - ((t = rs->rs_blkno / RX50SEC) * RX50SEC);
        !           149:                rxaddr->rxtrk = t == 79 ? 0 : t + 1;
        !           150: #ifdef notdef
        !           151:                rxaddr->rxsec = "\1\3\5\7\11\1\3\5\7"[(2*t + i) % 5] + (i > 4);
        !           152: #else
        !           153:                rxaddr->rxsec = RX50SKEW(i, t);
        !           154: #endif
        !           155:                i = rxaddr->rxgo;       /* start it up */
        !           156:                i = spl4();
        !           157:                while ((rs->rs_flags & RS_DONE) == 0)
        !           158:                        sleep((caddr_t) &rs->rs_blkno, PRIBIO);
        !           159:                splx(i);
        !           160:                if (rs->rs_flags & RS_ERROR) {
        !           161:                        error = EIO;
        !           162:                        break;
        !           163:                }
        !           164:                if (rw == UIO_READ) {
        !           165:                        /* copy the data out of the silo */
        !           166:                        i = rxaddr->rxrda;
        !           167:                        for (cp = secbuf, i = 512; --i >= 0;)
        !           168:                                *cp++ = rxaddr->rxedb;
        !           169:                        error = uiomove(secbuf, 512, UIO_READ, uio);
        !           170:                        if (error)
        !           171:                                break;
        !           172:                }
        !           173:        }
        !           174: 
        !           175:        /* let others in */
        !           176:        rs->rs_flags &= ~RS_BUSY;
        !           177:        if (rs->rs_flags & RS_WANT)
        !           178:                wakeup((caddr_t) rs);
        !           179: 
        !           180:        return (error);
        !           181: }
        !           182: 
        !           183: rx50read(dev, uio)
        !           184:        dev_t dev;
        !           185:        struct uio *uio;
        !           186: {
        !           187: 
        !           188:        return (rx50operation(dev, UIO_READ, uio));
        !           189: }
        !           190: 
        !           191: rx50write(dev, uio)
        !           192:        dev_t dev;
        !           193:        struct uio *uio;
        !           194: {
        !           195: 
        !           196:        return (rx50operation(dev, UIO_WRITE, uio));
        !           197: }
        !           198: 
        !           199: rx50intr()
        !           200: {
        !           201:        register struct rx50device *rxaddr = &rx50device;
        !           202:        register struct rx50state *rs = &rx50state;
        !           203:        int i;
        !           204: 
        !           205: #ifdef lint
        !           206:        i = 0; i = i;
        !           207: #endif
        !           208: 
        !           209:        /* ignore spurious interrupts */
        !           210:        if ((rxaddr->rxcmd & RXCMD_DONE) == 0)
        !           211:                return;
        !           212:        if ((rs->rs_flags & RS_BUSY) == 0) {
        !           213:                printf("stray rx50 interrupt ignored\n");
        !           214:                return;
        !           215:        }
        !           216:        if (rxaddr->rxcmd & RXCMD_ERROR) {
        !           217:                printf(
        !           218:        "csa%d: hard error sn%d: cmd=%x trk=%x sec=%x csc=%x ict=%x ext=%x\n",
        !           219:                        rs->rs_drive + 1, rs->rs_blkno,
        !           220:                        rxaddr->rxcmd, rxaddr->rxtrk, rxaddr->rxsec,
        !           221:                        rxaddr->rxcsc, rxaddr->rxict, rxaddr->rxext);
        !           222:                rxaddr->rxcmd = RXCMD_RESET;
        !           223:                i = rxaddr->rxgo;
        !           224:                rs->rs_flags |= RS_ERROR;
        !           225:        }
        !           226:        rs->rs_flags |= RS_DONE;
        !           227:        wakeup((caddr_t) &rs->rs_blkno);
        !           228: }
        !           229: #endif

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