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Annotation of 43BSDReno/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 is only permitted until one year after the first shipment
        !             9:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !            10:  * binary forms are permitted provided that: (1) source distributions retain
        !            11:  * this entire copyright notice and comment, and (2) distributions including
        !            12:  * binaries display the following acknowledgement:  This product includes
        !            13:  * software developed by the University of California, Berkeley and its
        !            14:  * contributors'' in the documentation or other materials provided with the
        !            15:  * distribution and in all advertising materials mentioning features or use
        !            16:  * of this software.  Neither the name of the University nor the names of
        !            17:  * its contributors may be used to endorse or promote products derived from
        !            18:  * this software without specific prior written permission.
        !            19:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            20:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            21:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            22:  *
        !            23:  *     @(#)rx50.c      7.4 (Berkeley) 6/28/90
        !            24:  */
        !            25: 
        !            26: #if VAX8200
        !            27: 
        !            28: /*
        !            29:  * Routines to handle the console RX50.
        !            30:  */
        !            31: 
        !            32: #include "param.h"
        !            33: #include "time.h"
        !            34: #include "kernel.h"
        !            35: #include "vmmac.h"
        !            36: #include "buf.h"
        !            37: #include "errno.h"
        !            38: #include "uio.h"
        !            39: 
        !            40: #include "cpu.h"
        !            41: #include "rx50reg.h"
        !            42: 
        !            43: struct rx50device rx50device;
        !            44: 
        !            45: #define        rx50unit(dev)   minor(dev)
        !            46: 
        !            47: struct rx50state {
        !            48:        short   rs_flags;       /* see below */
        !            49:        short   rs_drive;       /* current drive number */
        !            50:        u_int   rs_blkno;       /* current block number */
        !            51: } rx50state;
        !            52: 
        !            53: /* flags */
        !            54: #define        RS_0OPEN        0x01    /* drive 0 open -- must be first */
        !            55: #define        RS_1OPEN        0x02    /* drive 1 open -- must be second */
        !            56: #define        RS_BUSY         0x04    /* operation in progress */
        !            57: #define        RS_WANT         0x08    /* wakeup when done */
        !            58: #define        RS_DONE         0x20    /* I/O operation done */
        !            59: #define        RS_ERROR        0x40    /* error bit set at interrupt */
        !            60: 
        !            61: /*
        !            62:  * Open a console RX50.
        !            63:  */
        !            64: /*ARGSUSED*/
        !            65: rx50open(dev, flags)
        !            66:        dev_t dev;
        !            67:        int flags;
        !            68: {
        !            69:        int unit;
        !            70: 
        !            71:        /* only on 8200 (yet) */
        !            72:        if (cpu != VAX_8200 || (unit = rx50unit(dev)) >= 2)
        !            73:                return (ENXIO);
        !            74: 
        !            75:        /* enforce exclusive access */
        !            76:        if (rx50state.rs_flags & (1 << unit))
        !            77:                return (EBUSY);
        !            78:        rx50state.rs_flags |= 1 << unit;
        !            79:        return (0);
        !            80: }
        !            81: 
        !            82: /*
        !            83:  * Close a console RX50.
        !            84:  */
        !            85: /*ARGSUSED*/
        !            86: rx50close(dev, flags)
        !            87:        dev_t dev;
        !            88:        int flags;
        !            89: {
        !            90: 
        !            91:        rx50state.rs_flags &= ~(1 << dev);      /* atomic */
        !            92: }
        !            93: 
        !            94: /*
        !            95:  * Perform a read (uio->uio_rw==UIO_READ) or write (uio->uio_rw==UIO_WRITE).
        !            96:  */
        !            97: rx50rw(dev, uio, flags)
        !            98:        dev_t dev;
        !            99:        register struct uio *uio;
        !           100:        int flags;
        !           101: {
        !           102:        register struct rx50device *rxaddr;
        !           103:        register struct rx50state *rs;
        !           104:        register char *cp;
        !           105:        register int error, i, t;
        !           106:        char secbuf[512];
        !           107:        static char driveselect[2] = { RXCMD_DRIVE0, RXCMD_DRIVE1 };
        !           108: 
        !           109:        /* enforce whole-sector I/O */
        !           110:        if ((uio->uio_offset & 511) || (uio->uio_resid & 511))
        !           111:                return (EINVAL);
        !           112: 
        !           113:        rs = &rx50state;
        !           114: 
        !           115:        /* lock out others */
        !           116:        i = spl4();
        !           117:        while (rs->rs_flags & RS_BUSY) {
        !           118:                rs->rs_flags |= RS_WANT;
        !           119:                sleep((caddr_t) &rx50state, PZERO - 1);
        !           120:        }
        !           121:        rs->rs_flags |= RS_BUSY;
        !           122:        rs->rs_drive = rx50unit(dev);
        !           123:        splx(i);
        !           124: 
        !           125:        rxaddr = &rx50device;
        !           126:        error = 0;
        !           127: 
        !           128:        while (uio->uio_resid) {
        !           129:                rs->rs_blkno = uio->uio_offset >> 9;
        !           130:                if (rs->rs_blkno >= RX50MAXSEC) {
        !           131:                        if (rs->rs_blkno > RX50MAXSEC)
        !           132:                                error = EINVAL;
        !           133:                        else if (uio->uio_rw == UIO_WRITE)
        !           134:                                error = ENOSPC;
        !           135:                        /* else ``eof'' */
        !           136:                        break;
        !           137:                }
        !           138:                rs->rs_flags &= ~(RS_ERROR | RS_DONE);
        !           139:                if (uio->uio_rw == UIO_WRITE) {
        !           140:                        /* copy the data to the RX50 silo */
        !           141:                        error = uiomove(secbuf, 512, uio);
        !           142:                        if (error)
        !           143:                                break;
        !           144:                        i = rxaddr->rxrda;
        !           145:                        for (cp = secbuf, i = 512; --i >= 0;)
        !           146:                                rxaddr->rxfdb = *cp++;
        !           147:                        i = RXCMD_WRITE;
        !           148:                } else
        !           149:                        i = RXCMD_READ;
        !           150:                rxaddr->rxcmd = i | driveselect[rs->rs_drive];
        !           151:                i = rs->rs_blkno - ((t = rs->rs_blkno / RX50SEC) * RX50SEC);
        !           152:                rxaddr->rxtrk = t == 79 ? 0 : t + 1;
        !           153: #ifdef notdef
        !           154:                rxaddr->rxsec = "\1\3\5\7\11\1\3\5\7"[(2*t + i) % 5] + (i > 4);
        !           155: #else
        !           156:                rxaddr->rxsec = RX50SKEW(i, t);
        !           157: #endif
        !           158:                i = rxaddr->rxgo;       /* start it up */
        !           159:                i = spl4();
        !           160:                while ((rs->rs_flags & RS_DONE) == 0)
        !           161:                        sleep((caddr_t) &rs->rs_blkno, PRIBIO);
        !           162:                splx(i);
        !           163:                if (rs->rs_flags & RS_ERROR) {
        !           164:                        error = EIO;
        !           165:                        break;
        !           166:                }
        !           167:                if (uio->uio_rw == UIO_READ) {
        !           168:                        /* copy the data out of the silo */
        !           169:                        i = rxaddr->rxrda;
        !           170:                        for (cp = secbuf, i = 512; --i >= 0;)
        !           171:                                *cp++ = rxaddr->rxedb;
        !           172:                        error = uiomove(secbuf, 512, uio);
        !           173:                        if (error)
        !           174:                                break;
        !           175:                }
        !           176:        }
        !           177: 
        !           178:        /* let others in */
        !           179:        rs->rs_flags &= ~RS_BUSY;
        !           180:        if (rs->rs_flags & RS_WANT)
        !           181:                wakeup((caddr_t) rs);
        !           182: 
        !           183:        return (error);
        !           184: }
        !           185: 
        !           186: rx50intr()
        !           187: {
        !           188:        register struct rx50device *rxaddr = &rx50device;
        !           189:        register struct rx50state *rs = &rx50state;
        !           190:        int i;
        !           191: 
        !           192: #ifdef lint
        !           193:        i = 0; i = i;
        !           194: #endif
        !           195: 
        !           196:        /* ignore spurious interrupts */
        !           197:        if ((rxaddr->rxcmd & RXCMD_DONE) == 0)
        !           198:                return;
        !           199:        if ((rs->rs_flags & RS_BUSY) == 0) {
        !           200:                printf("stray rx50 interrupt ignored\n");
        !           201:                return;
        !           202:        }
        !           203:        if (rxaddr->rxcmd & RXCMD_ERROR) {
        !           204:                printf(
        !           205:        "csa%d: hard error sn%d: cmd=%x trk=%x sec=%x csc=%x ict=%x ext=%x\n",
        !           206:                        rs->rs_drive + 1, rs->rs_blkno,
        !           207:                        rxaddr->rxcmd, rxaddr->rxtrk, rxaddr->rxsec,
        !           208:                        rxaddr->rxcsc, rxaddr->rxict, rxaddr->rxext);
        !           209:                rxaddr->rxcmd = RXCMD_RESET;
        !           210:                i = rxaddr->rxgo;
        !           211:                rs->rs_flags |= RS_ERROR;
        !           212:        }
        !           213:        rs->rs_flags |= RS_DONE;
        !           214:        wakeup((caddr_t) &rs->rs_blkno);
        !           215: }
        !           216: #endif

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