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Annotation of 41BSD/sys/stand/up.c.SC11, revision 1.1

1.1     ! root        1: /*     up.c    4.1     11/9/80 */
        !             2: 
        !             3: #define        OLDUCODE
        !             4: 
        !             5: #include "../h/param.h"
        !             6: #include "../h/inode.h"
        !             7: #include "../h/pte.h"
        !             8: #include "../h/uba.h"
        !             9: #include "saio.h"
        !            10: 
        !            11: #define        EMULEX
        !            12: #ifdef EMULEX
        !            13: #define DELAY(N)       { register int d; d = N; while (--d > 0); }
        !            14: #else
        !            15: #define        DELAY(N)
        !            16: #endif
        !            17: 
        !            18: struct upregs {
        !            19:        short   upcs1;  /* Control and Status register 1 */
        !            20:        short   upwc;   /* Word count register */
        !            21:        short   upba;   /* UNIBUS address register */
        !            22:        short   upda;   /* Desired address register */
        !            23:        short   upcs2;  /* Control and Status register 2*/
        !            24:        short   upds;   /* Drive Status */
        !            25:        short   uper1;  /* Error register 1 */
        !            26:        short   upas;   /* Attention Summary */
        !            27:        short   upla;   /* Look ahead */
        !            28:        short   updb;   /* Data buffer */
        !            29:        short   upmr;   /* Maintenance register */
        !            30:        short   updt;   /* Drive type */
        !            31:        short   upsn;   /* Serial number */
        !            32:        short   upof;   /* Offset register */
        !            33:        short   upca;   /* Desired Cylinder address register*/
        !            34:        short   upcc;   /* Current Cylinder */
        !            35:        short   uper2;  /* Error register 2 */
        !            36:        short   uper3;  /* Error register 3 */
        !            37:        short   uppos;  /* Burst error bit position */
        !            38:        short   uppat;  /* Burst error bit pattern */
        !            39:        short   upbae;  /* 11/70 bus extension */
        !            40: };
        !            41: 
        !            42: #ifdef OLDUCODE
        !            43: #define        SDELAY  500
        !            44: #else
        !            45: #define        SDELAY  25
        !            46: #endif
        !            47: int    sdelay = SDELAY;
        !            48: int    idelay = 500;
        !            49: 
        !            50: #define        UPADDR ((struct upregs *)(PHYSUMEM + 0776700 - UNIBASE))
        !            51: 
        !            52: /* Drive commands, placed in upcs1 */
        !            53: #define        GO      01              /* Go bit, set in all commands */
        !            54: #define        PRESET  020             /* Preset drive at init or after errors */
        !            55: #define        OFFSET  014             /* Offset heads to try to recover error */
        !            56: #define        RTC     016             /* Return to center-line after OFFSET */
        !            57: #define        SEARCH  030             /* Search for cylinder+sector */
        !            58: #define        SEEK    04              /* Seek to cylinder */
        !            59: #define        RECAL   06              /* Recalibrate, needed after seek error */
        !            60: #define        DCLR    010             /* Drive clear, after error */
        !            61: #define        WCOM    060             /* Write */
        !            62: #define        RCOM    070             /* Read */
        !            63: 
        !            64: /* Other bits of upcs1 */
        !            65: #define        IE      0100            /* Controller wide interrupt enable */
        !            66: #define        TRE     040000          /* Transfer error */
        !            67: #define        RDY     0200            /* Transfer terminated */
        !            68: 
        !            69: /* Drive status bits of upds */
        !            70: #define        PIP     020000          /* Positioning in progress */
        !            71: #define        ERR     040000          /* Error has occurred, DCLR necessary */
        !            72: #define        VV      0100            /* Volume is valid, set by PRESET */
        !            73: #define        DPR     0400            /* Drive has been preset */
        !            74: #define        MOL     010000          /* Drive is online, heads loaded, etc */
        !            75: #define        DRY     0200            /* Drive ready */
        !            76: 
        !            77: /* Bits of upcs2 */
        !            78: #define        CLR     040             /* Controller clear */
        !            79: /* Bits of uper1 */
        !            80: #define        DCK     0100000         /* Ecc error occurred */
        !            81: #define        ECH     0100            /* Ecc error was unrecoverable */
        !            82: #define        WLE     04000           /* Attempt to write read-only drive */
        !            83: 
        !            84: /* Bits of upof; the offset bits above are also in this register */
        !            85: #define        FMT22   010000          /* 16 bits/word, must be always set */
        !            86: 
        !            87: struct devsize {
        !            88:        daddr_t cyloff;
        !            89: } up_sizes[] = {
        !            90:        0, 27, 68, -1, -1, -1, -1, 82
        !            91: };
        !            92: 
        !            93: upopen(io)
        !            94: register struct iob *io;
        !            95: {
        !            96: 
        !            97:        if (up_sizes[io->i_boff].cyloff == -1 ||
        !            98:            io->i_boff < 0 || io->i_boff > 7)
        !            99:                _stop("up bad unit");
        !           100:        io->i_boff = up_sizes[io->i_boff].cyloff * 32 * 19;
        !           101: }
        !           102: 
        !           103: upstrategy(io, func)
        !           104: register struct iob *io;
        !           105: {
        !           106:        int unit, nspc, ns, cn, tn, sn;
        !           107:        daddr_t bn;
        !           108:        int info;
        !           109:        register short *rp;
        !           110:        int occ = io->i_cc;
        !           111:        register struct upregs *upaddr = UPADDR;
        !           112: 
        !           113:        unit = io->i_unit;
        !           114:        bn = io->i_bn;
        !           115:        nspc = 32 * 19;
        !           116:        ns = 32;
        !           117:        cn = bn/nspc;
        !           118:        sn = bn%nspc;
        !           119:        tn = sn/ns;
        !           120:        sn = sn%ns;
        !           121:        upaddr->upcs2 = unit;
        !           122:        DELAY(sdelay);
        !           123:        if ((upaddr->upds & VV) == 0) {
        !           124:                upaddr->upcs1 = DCLR|GO;
        !           125:                DELAY(idelay);
        !           126:                upaddr->upcs1 = PRESET|GO;
        !           127:                DELAY(idelay);
        !           128:                upaddr->upof = FMT22;
        !           129:        }
        !           130:        if ((upaddr->upds & (DPR|MOL)) != (DPR|MOL))
        !           131:                _stop("up !DPR || !MOL");
        !           132:        info = ubasetup(io, 1);
        !           133:        rp = (short *) &upaddr->upda;
        !           134:        upaddr->upca = cn;
        !           135:        *rp = (tn << 8) + sn;
        !           136:        *--rp = info;
        !           137:        *--rp = -io->i_cc / sizeof (short);
        !           138:        if (func == READ)
        !           139:                *--rp = GO|RCOM;
        !           140:        else
        !           141:                *--rp = GO|WCOM;
        !           142:        DELAY(sdelay);
        !           143:        do {
        !           144:                DELAY(25);
        !           145:        } while ((upaddr->upcs1 & RDY) == 0);
        !           146:        DELAY(200);
        !           147:        if (upaddr->upcs1&ERR) {
        !           148:                printf("disk error: cyl=%d track=%d sect=%d cs1=%X, er1=%X\n",
        !           149:                    cn, tn, sn,
        !           150:                    upaddr->upcs1, upaddr->uper1);
        !           151:                return (-1);
        !           152:        }
        !           153:        if (io->i_cc != occ)
        !           154:                printf("returned %d\n", io->i_cc);
        !           155:        ubafree(info);
        !           156:        return (io->i_cc);
        !           157: }

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