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Annotation of Net2/arch/vax/bi/kdb.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, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by the University of
        !            19:  *     California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  *     @(#)kdb.c       7.10 (Berkeley) 12/16/90
        !            37:  */
        !            38: 
        !            39: /*
        !            40:  * KDB50/MSCP device driver
        !            41:  */
        !            42: 
        !            43: /*
        !            44:  * TODO
        !            45:  *     rethink BI software interface
        !            46:  *     write bad block forwarding code
        !            47:  */
        !            48: 
        !            49: #include "kra.h"               /* XXX */
        !            50: 
        !            51: #define        DRIVENAMES      "kra"   /* XXX */
        !            52: 
        !            53: #if NKDB > 0
        !            54: 
        !            55: /*
        !            56:  * CONFIGURATION OPTIONS.  The next three defines are tunable -- tune away!
        !            57:  *
        !            58:  * NRSPL2 and NCMDL2 control the number of response and command
        !            59:  * packets respectively.  They may be any value from 0 to 7, though
        !            60:  * setting them higher than 5 is unlikely to be of any value.
        !            61:  * If you get warnings about your command ring being too small,
        !            62:  * try increasing the values by one.
        !            63:  *
        !            64:  * MAXUNIT controls the maximum slave number (and hence number of drives
        !            65:  * per controller) we are prepared to handle.
        !            66:  */
        !            67: #define        NRSPL2  5               /* log2 number of response packets */
        !            68: #define NCMDL2 5               /* log2 number of command packets */
        !            69: #define        MAXUNIT 8               /* maximum allowed unit number */
        !            70: 
        !            71: #include "sys/param.h"
        !            72: #include "sys/systm.h"
        !            73: #include "sys/malloc.h"
        !            74: #include "sys/map.h"
        !            75: #include "sys/buf.h"
        !            76: #include "sys/conf.h"
        !            77: #include "sys/user.h"
        !            78: #include "sys/proc.h"
        !            79: #include "sys/vm.h"
        !            80: #include "sys/dkstat.h"
        !            81: #include "sys/cmap.h"
        !            82: #include "sys/syslog.h"
        !            83: #include "sys/kernel.h"
        !            84: 
        !            85: #define        NRSP    (1 << NRSPL2)
        !            86: #define        NCMD    (1 << NCMDL2)
        !            87: 
        !            88: #include "../include/pte.h"
        !            89: #include "../include/cpu.h"
        !            90: #include "../vax/mscp.h"
        !            91: #include "../vax/mscpvar.h"
        !            92: #include "../include/mtpr.h"
        !            93: 
        !            94: #include "bireg.h"
        !            95: #include "kdbreg.h"
        !            96: 
        !            97: #include "../uba/ubavar.h"
        !            98: 
        !            99: /*
        !           100:  * Conversions from kernel virtual to physical and page table addresses.
        !           101:  * PHYS works only for kernel text and primary (compile time) data addresses.
        !           102:  */
        !           103: #define        PHYS(cast, addr) \
        !           104:        ((cast) ((int)(addr) & 0x7fffffff))
        !           105: 
        !           106: /*
        !           107:  * KDB variables, per controller.
        !           108:  */
        !           109: struct kdbinfo {
        !           110:        /* software info, per KDB */
        !           111:        struct  kdb_regs *ki_kdb;       /* KDB registers */
        !           112:        struct  kdb_regs *ki_physkdb;   /* phys address of KDB registers */
        !           113:        short   ki_state;               /* KDB50 state; see below */
        !           114:        short   ki_flags;               /* flags; see below */
        !           115:        int     ki_micro;               /* microcode revision */
        !           116:        short   ki_vec;                 /* scb vector offset */
        !           117:        short   ki_wticks;              /* watchdog timer ticks */
        !           118: 
        !           119:        /*
        !           120:         * KDB PTEs must be contiguous.  Some I/O is done on addresses
        !           121:         * for which this is true (PTEs in Sysmap and Usrptmap), but
        !           122:         * other transfers may have PTEs that are scattered in physical
        !           123:         * space.  Ki_map maps a physically contiguous PTE space used
        !           124:         * for these transfers.
        !           125:         */
        !           126: #define KI_MAPSIZ      (NCMD + 2)
        !           127:        struct  map *ki_map;            /* resource map */
        !           128: #define KI_PTES                256
        !           129:        struct  pte ki_pte[KI_PTES];    /* contiguous PTE space */
        !           130:        long    ki_ptephys;             /* phys address of &ki_pte[0] */
        !           131: 
        !           132:        struct  mscp_info ki_mi;        /* MSCP info (per mscpvar.h) */
        !           133:        struct  buf ki_tab;             /* controller queue */
        !           134: 
        !           135:        /* stuff read and written by hardware */
        !           136:        struct  kdbca ki_ca;            /* communications area */
        !           137:        struct  mscp ki_rsp[NRSP];      /* response packets */
        !           138:        struct  mscp ki_cmd[NCMD];      /* command packets */
        !           139: } kdbinfo[NKDB];
        !           140: 
        !           141: #define        ki_ctlr ki_mi.mi_ctlr
        !           142: 
        !           143: /*
        !           144:  * Controller states
        !           145:  */
        !           146: #define        ST_IDLE         0       /* uninitialised */
        !           147: #define        ST_STEP1        1       /* in `STEP 1' */
        !           148: #define        ST_STEP2        2       /* in `STEP 2' */
        !           149: #define        ST_STEP3        3       /* in `STEP 3' */
        !           150: #define        ST_SETCHAR      4       /* in `Set Controller Characteristics' */
        !           151: #define        ST_RUN          5       /* up and running */
        !           152: 
        !           153: /*
        !           154:  * Flags
        !           155:  */
        !           156: #define        KDB_ALIVE       0x01    /* this KDB50 exists */
        !           157: #define        KDB_GRIPED      0x04    /* griped about cmd ring too small */
        !           158: #define        KDB_INSLAVE     0x08    /* inside kdbslave() */
        !           159: #define        KDB_DOWAKE      0x10    /* wakeup when ctlr init done */
        !           160: 
        !           161: struct kdbstats kdbstats;      /* statistics */
        !           162: 
        !           163: /*
        !           164:  * Device to unit number and partition:
        !           165:  */
        !           166: #define        UNITSHIFT       3
        !           167: #define        UNITMASK        7
        !           168: #define        kdbunit(dev)    (minor(dev) >> UNITSHIFT)
        !           169: #define        kdbpart(dev)    (minor(dev) & UNITMASK)
        !           170: 
        !           171: /* THIS SHOULD BE READ OFF THE PACK, PER DRIVE */
        !           172: /* THESE SHOULD BE SHARED WITH uda.c (but not yet) */
        !           173: struct size {
        !           174:        daddr_t nblocks;
        !           175:        daddr_t blkoff;
        !           176: } kra81_sizes[8] = {
        !           177: #ifdef MARYLAND
        !           178:        67832,  0,              /* A=cyl    0 thru   94 + 2 sectors */
        !           179:        67828,  67832,          /* B=cyl   95 thru  189 - 2 sectors */
        !           180:        -1,     0,              /* C=cyl    0 thru 1247 */
        !           181:        -1,     135660,         /* D=cyl  190 thru 1247 */
        !           182:        449466, 49324,          /* E xxx */
        !           183:        64260,  498790,         /* F xxx */
        !           184:        328022, 563050,         /* G xxx */
        !           185:        0,      0,
        !           186: #else
        !           187:        15884,  0,              /* a */
        !           188:        33440,  15884,          /* b */
        !           189:        -1,     0,              /* c */
        !           190:        -1,     49324,          /* d */
        !           191:        449466, 49324,          /* e */
        !           192:        64260,  498790,         /* f */
        !           193:        328022, 563050,         /* g */
        !           194:        0,      0,
        !           195: #endif
        !           196: }, kra80_sizes[8] = {
        !           197:        15884,  0,              /* A=blk 0 thru 15883 */
        !           198:        33440,  15884,          /* B=blk 15884 thru 49323 */
        !           199:        -1,     0,              /* C=blk 0 thru end */
        !           200:        0,      0,
        !           201:        0,      0,
        !           202:        0,      0,
        !           203:        82080,  49324,          /* G=blk 49324 thru 131403 */
        !           204:        -1,     131404,         /* H=blk 131404 thru end */
        !           205: }, kra60_sizes[8] = {
        !           206:        15884,  0,              /* A=blk 0 thru 15883 */
        !           207:        33440,  15884,          /* B=blk 15884 thru 49323 */
        !           208:        -1,     0,              /* C=blk 0 thru end */
        !           209:        -1,     49324,          /* D=blk 49324 thru end */
        !           210:        0,      0,
        !           211:        0,      0,
        !           212:        82080,  49324,          /* G=blk 49324 thru 131403 */
        !           213:        -1,     131404,         /* H=blk 131404 thru end */
        !           214: };
        !           215: /* END OF STUFF WHICH SHOULD BE READ IN PER DISK */
        !           216: 
        !           217: /*
        !           218:  * Drive type index decoding table.  `ut_name' is null iff the
        !           219:  * type is not known.
        !           220:  */
        !           221: struct kdbtypes {
        !           222:        char    *ut_name;       /* drive type name */
        !           223:        struct  size *ut_sizes; /* partition tables */
        !           224: } kdbtypes[] = {
        !           225:        NULL,           NULL,
        !           226:        "ra80",         kra80_sizes,    /* 1 = ra80 */
        !           227:        NULL,           NULL,
        !           228:        NULL,           NULL,
        !           229:        "ra60",         kra60_sizes,    /* 4 = ra60 */
        !           230:        "ra81",         kra81_sizes,    /* 5 = ra81 */
        !           231: };
        !           232: 
        !           233: #define NTYPES 6
        !           234: 
        !           235: /*
        !           236:  * Definition of the driver for autoconf and generic MSCP code.
        !           237:  * SOME OF THIS IS BOGUS (must fix config)
        !           238:  */
        !           239: 
        !           240: #ifdef notdef          /* not when driver is for kra disks */
        !           241: /*
        !           242:  * Some of these variables (per-drive stuff) are shared
        !           243:  * with the UDA50 code (why not, they are the same drives).
        !           244:  * N.B.: kdbdinfo must not be shared.
        !           245:  */
        !           246: #define        kdbutab         udautab         /* shared */
        !           247: #define        kdbslavereply   udaslavereply   /* shared */
        !           248: #endif
        !           249: 
        !           250: int    kdbprobe();             /* XXX */
        !           251: int    kdbslave(), kdbattach();
        !           252: 
        !           253: int    kdbdgram(), kdbctlrdone(), kdbunconf(), kdbiodone();
        !           254: int    kdbonline(), kdbgotstatus(), kdbioerror();
        !           255: 
        !           256: struct uba_device *kdbdinfo[NKRA];     /* uba_device indeed! */
        !           257: struct buf kdbutab[NKRA];      /* per drive transfer queue */
        !           258: 
        !           259: u_short kdbstd[] = { 0 };      /* XXX */
        !           260: struct uba_driver kdbdriver =  /* XXX */
        !           261:  { kdbprobe, kdbslave, kdbattach, 0, kdbstd, DRIVENAMES, kdbdinfo, "kdb" };
        !           262: 
        !           263: struct mscp_driver kdbmscpdriver =
        !           264:  { MAXUNIT, NKRA, UNITSHIFT, kdbutab, (struct disklabel *)0, kdbdinfo,
        !           265:    kdbdgram, kdbctlrdone, kdbunconf, kdbiodone,
        !           266:    kdbonline, kdbgotstatus, NULL, kdbioerror, NULL,
        !           267:    "kdb", DRIVENAMES };
        !           268: 
        !           269: /*
        !           270:  * Miscellaneous private variables.
        !           271:  */
        !           272: char   kdbsr_bits[] = KDBSR_BITS;
        !           273: 
        !           274: struct uba_device *kdbip[NKDB][MAXUNIT];
        !           275:                                /* inverting pointers: ctlr & unit => `Unibus'
        !           276:                                   device pointer */
        !           277: 
        !           278: daddr_t        ra_dsize[NKRA];         /* drive sizes, from on line end packets */
        !           279: 
        !           280: struct mscp kdbslavereply;     /* get unit status response packet, set
        !           281:                                   for kdbslave by kdbunconf, via kdbintr */
        !           282: 
        !           283: int    kdbwstart, kdbwatch();  /* watchdog timer */
        !           284: int    wakeup();
        !           285: 
        !           286: /*
        !           287:  * If kdbprobe is called, return 0 to keep Unibus code from attempting
        !           288:  * to use this device. XXX rethink
        !           289:  */
        !           290: /* ARGSUSED */
        !           291: kdbprobe(reg, ctlr)
        !           292:        caddr_t reg;
        !           293:        int ctlr;
        !           294: {
        !           295: 
        !           296:        return (0);
        !           297: }
        !           298: 
        !           299: /*
        !           300:  * Configure in a KDB50 controller.
        !           301:  */
        !           302: kdbconfig(kdbnum, va, pa, vec)
        !           303:        int kdbnum;
        !           304:        struct biiregs *va, *pa;
        !           305:        int vec;
        !           306: {
        !           307:        register struct kdbinfo *ki;
        !           308: #define mi (&ki->ki_mi)
        !           309: 
        !           310: #ifdef lint
        !           311:        extern int (*kdbint0[])();
        !           312: 
        !           313:        (*kdbint0[0])(0);       /* this is a config botch */
        !           314:        kdbintr(0);
        !           315: #endif
        !           316: 
        !           317:        /*
        !           318:         * Set up local KDB status.
        !           319:         */
        !           320:        ki = &kdbinfo[kdbnum];
        !           321:        ki->ki_kdb = (struct kdb_regs *)va;
        !           322:        ki->ki_physkdb = (struct kdb_regs *)pa;
        !           323:        ki->ki_vec = vec;
        !           324:        ki->ki_map =
        !           325:            (struct map *)malloc((u_long)(KI_MAPSIZ * sizeof(struct map)),
        !           326:            M_DEVBUF, M_NOWAIT);
        !           327:        if (ki->ki_map == NULL) {
        !           328:                printf("kdb%d: cannot get memory for ptes\n", kdbnum);
        !           329:                return;
        !           330:        }
        !           331:        ki->ki_ptephys = PHYS(long, ki->ki_pte); /* kvtophys(ki->ki_pte) */
        !           332:        ki->ki_flags = KDB_ALIVE;
        !           333: 
        !           334:        /* THE FOLLOWING IS ONLY NEEDED TO CIRCUMVENT A BUG IN rminit */
        !           335:        bzero((caddr_t)ki->ki_map, KI_MAPSIZ * sizeof(struct map));
        !           336: 
        !           337:        rminit(ki->ki_map, (long)KI_PTES, (long)1, "kdb", KI_MAPSIZ);
        !           338: 
        !           339:        /*
        !           340:         * Set up the generic MSCP structures.
        !           341:         */
        !           342:        mi->mi_md = &kdbmscpdriver;
        !           343:        mi->mi_ctlr = kdbnum;   /* also sets ki->ki_ctlr */
        !           344:        mi->mi_tab = &ki->ki_tab;
        !           345:        mi->mi_ip = kdbip[kdbnum];
        !           346:        mi->mi_cmd.mri_size = NCMD;
        !           347:        mi->mi_cmd.mri_desc = ki->ki_ca.ca_cmddsc;
        !           348:        mi->mi_cmd.mri_ring = ki->ki_cmd;
        !           349:        mi->mi_rsp.mri_size = NRSP;
        !           350:        mi->mi_rsp.mri_desc = ki->ki_ca.ca_rspdsc;
        !           351:        mi->mi_rsp.mri_ring = ki->ki_rsp;
        !           352:        mi->mi_wtab.av_forw = mi->mi_wtab.av_back = &mi->mi_wtab;
        !           353: #undef mi
        !           354: }
        !           355: 
        !           356: /*
        !           357:  * Find a slave.
        !           358:  * Note that by the time kdbslave is called, the interrupt vector
        !           359:  * for the KDB50 has been set up (so that kdbunconf() will be called).
        !           360:  */
        !           361: kdbslave(ui)
        !           362:        register struct uba_device *ui;
        !           363: {
        !           364:        register struct kdbinfo *ki;
        !           365:        register struct mscp *mp;
        !           366:        int next = 0, type, timeout, tries, i;
        !           367: 
        !           368: #ifdef lint
        !           369:        i = 0; i = i;
        !           370: #endif
        !           371:        /*
        !           372:         * Make sure the controller is fully initialised, by waiting
        !           373:         * for it if necessary.
        !           374:         */
        !           375:        ki = &kdbinfo[ui->ui_ctlr];
        !           376:        if (ki->ki_state == ST_RUN)
        !           377:                goto findunit;
        !           378:        tries = 0;
        !           379: again:
        !           380:        if (kdbinit(ki))
        !           381:                return (0);
        !           382:        timeout = todr() + 1000;                /* 10 seconds */
        !           383:        while (todr() < timeout)
        !           384:                if (ki->ki_state == ST_RUN)     /* made it */
        !           385:                        goto findunit;
        !           386:        if (++tries < 2)
        !           387:                goto again;
        !           388:        printf("kdb%d: controller hung\n", ki->ki_ctlr);
        !           389:        return (0);
        !           390: 
        !           391:        /*
        !           392:         * The controller is all set; go find the unit.  Grab an
        !           393:         * MSCP packet and send out a Get Unit Status command, with
        !           394:         * the `next unit' modifier if we are looking for a generic
        !           395:         * unit.  We set the `in slave' flag so that kdbunconf()
        !           396:         * knows to copy the response to `kdbslavereply'.
        !           397:         */
        !           398: findunit:
        !           399:        kdbslavereply.mscp_opcode = 0;
        !           400:        ki->ki_flags |= KDB_INSLAVE;
        !           401:        if ((mp = mscp_getcp(&ki->ki_mi, MSCP_DONTWAIT)) == NULL)
        !           402:                panic("kdbslave");              /* `cannot happen' */
        !           403:        mp->mscp_opcode = M_OP_GETUNITST;
        !           404:        if (ui->ui_slave == '?') {
        !           405:                mp->mscp_unit = next;
        !           406:                mp->mscp_modifier = M_GUM_NEXTUNIT;
        !           407:        } else {
        !           408:                mp->mscp_unit = ui->ui_slave;
        !           409:                mp->mscp_modifier = 0;
        !           410:        }
        !           411:        *mp->mscp_addr |= MSCP_OWN | MSCP_INT;
        !           412:        i = ki->ki_kdb->kdb_ip; /* initiate polling */
        !           413:        mp = &kdbslavereply;
        !           414:        timeout = todr() + 1000;
        !           415:        while (todr() < timeout)
        !           416:                if (mp->mscp_opcode)
        !           417:                        goto gotit;
        !           418:        printf("kdb%d: no response to Get Unit Status request\n",
        !           419:                ki->ki_ctlr);
        !           420:        ki->ki_flags &= ~KDB_INSLAVE;
        !           421:        return (0);
        !           422: 
        !           423: gotit:
        !           424:        ki->ki_flags &= ~KDB_INSLAVE;
        !           425: 
        !           426:        /*
        !           427:         * Got a slave response.  If the unit is there, use it.
        !           428:         */
        !           429:        switch (mp->mscp_status & M_ST_MASK) {
        !           430: 
        !           431:        case M_ST_SUCCESS:      /* worked */
        !           432:        case M_ST_AVAILABLE:    /* found another drive */
        !           433:                break;          /* use it */
        !           434: 
        !           435:        case M_ST_OFFLINE:
        !           436:                /*
        !           437:                 * Figure out why it is off line.  It may be because
        !           438:                 * it is nonexistent, or because it is spun down, or
        !           439:                 * for some other reason.
        !           440:                 */
        !           441:                switch (mp->mscp_status & ~M_ST_MASK) {
        !           442: 
        !           443:                case M_OFFLINE_UNKNOWN:
        !           444:                        /*
        !           445:                         * No such drive, and there are none with
        !           446:                         * higher unit numbers either, if we are
        !           447:                         * using M_GUM_NEXTUNIT.
        !           448:                         */
        !           449:                        return (0);
        !           450: 
        !           451:                case M_OFFLINE_UNMOUNTED:
        !           452:                        /*
        !           453:                         * The drive is not spun up.  Use it anyway.
        !           454:                         *
        !           455:                         * N.B.: this seems to be a common occurrance
        !           456:                         * after a power failure.  The first attempt
        !           457:                         * to bring it on line seems to spin it up
        !           458:                         * (and thus takes several minutes).  Perhaps
        !           459:                         * we should note here that the on-line may
        !           460:                         * take longer than usual.
        !           461:                         */
        !           462:                        break;
        !           463: 
        !           464:                default:
        !           465:                        /*
        !           466:                         * In service, or something else equally unusable.
        !           467:                         */
        !           468:                        printf("kdb%d: unit %d off line:", ki->ki_ctlr,
        !           469:                                mp->mscp_unit);
        !           470:                        mscp_printevent(mp);
        !           471:                        goto try_another;
        !           472:                }
        !           473:                break;
        !           474: 
        !           475:        default:
        !           476:                printf("kdb%d: unable to get unit status:", ki->ki_ctlr);
        !           477:                mscp_printevent(mp);
        !           478:                return (0);
        !           479:        }
        !           480: 
        !           481:        /*
        !           482:         * Does this ever happen?  What (if anything) does it mean?
        !           483:         */
        !           484:        if (mp->mscp_unit < next) {
        !           485:                printf("kdb%d: unit %d, next %d\n",
        !           486:                        ki->ki_ctlr, mp->mscp_unit, next);
        !           487:                return (0);
        !           488:        }
        !           489: 
        !           490:        if (mp->mscp_unit >= MAXUNIT) {
        !           491:                printf("kdb%d: cannot handle unit number %d (max is %d)\n",
        !           492:                        ki->ki_ctlr, mp->mscp_unit, MAXUNIT - 1);
        !           493:                return (0);
        !           494:        }
        !           495: 
        !           496:        /*
        !           497:         * See if we already handle this drive.
        !           498:         * (Only likely if ui->ui_slave=='?'.)
        !           499:         */
        !           500:        if (kdbip[ki->ki_ctlr][mp->mscp_unit] != NULL)
        !           501:                goto try_another;
        !           502: 
        !           503:        /*
        !           504:         * Make sure we know about this kind of drive.
        !           505:         * Others say we should treat unknowns as RA81s; I am
        !           506:         * not sure this is safe.
        !           507:         */
        !           508:        type = mp->mscp_guse.guse_drivetype;
        !           509:        if (type >= NTYPES || kdbtypes[type].ut_name == 0) {
        !           510:                register long id = mp->mscp_guse.guse_mediaid;
        !           511: 
        !           512:                printf("kdb%d: unit %d: media ID `", ki->ki_ctlr,
        !           513:                        mp->mscp_unit);
        !           514:                printf("%c%c %c%c%c%d",
        !           515:                        MSCP_MID_CHAR(4, id), MSCP_MID_CHAR(3, id),
        !           516:                        MSCP_MID_CHAR(2, id), MSCP_MID_CHAR(1, id),
        !           517:                        MSCP_MID_CHAR(0, id), MSCP_MID_NUM(id));
        !           518:                printf("' is of unknown type %d; ignored\n", type);
        !           519: try_another:
        !           520:                if (ui->ui_slave != '?')
        !           521:                        return (0);
        !           522:                next = mp->mscp_unit + 1;
        !           523:                goto findunit;
        !           524:        }
        !           525: 
        !           526:        /*
        !           527:         * Voila!
        !           528:         */
        !           529:        ui->ui_type = type;
        !           530:        ui->ui_flags = 0;       /* not on line, nor anything else */
        !           531:        ui->ui_slave = mp->mscp_unit;
        !           532:        return (1);
        !           533: }
        !           534: 
        !           535: /*
        !           536:  * Attach a found slave.  Make sure the watchdog timer is running.
        !           537:  * If this disk is being profiled, fill in the `wpms' value (used by
        !           538:  * what?).  Set up the inverting pointer, and attempt to bring the
        !           539:  * drive on line.
        !           540:  */
        !           541: kdbattach(ui)
        !           542:        register struct uba_device *ui;
        !           543: {
        !           544: 
        !           545:        if (kdbwstart == 0) {
        !           546:                timeout(kdbwatch, (caddr_t)0, hz);
        !           547:                kdbwstart++;
        !           548:        }
        !           549:        if (ui->ui_dk >= 0)
        !           550:                dk_wpms[ui->ui_dk] = (60 * 31 * 256);   /* approx */
        !           551:        kdbip[ui->ui_ctlr][ui->ui_slave] = ui;
        !           552:        (void) kdb_bringonline(ui, 1);
        !           553:        /* should we get its status too? */
        !           554: }
        !           555: 
        !           556: /*
        !           557:  * Initialise a KDB50.  Return true iff something goes wrong.
        !           558:  */
        !           559: kdbinit(ki)
        !           560:        register struct kdbinfo *ki;
        !           561: {
        !           562:        register struct kdb_regs *ka = ki->ki_kdb;
        !           563:        int timo;
        !           564: 
        !           565:        /*
        !           566:         * While we are thinking about it, reset the next command
        !           567:         * and response indicies.
        !           568:         */
        !           569:        ki->ki_mi.mi_cmd.mri_next = 0;
        !           570:        ki->ki_mi.mi_rsp.mri_next = 0;
        !           571: 
        !           572:        /*
        !           573:         * Start up the hardware initialisation sequence.
        !           574:         */
        !           575: #define        STEP0MASK (KDB_ERR | KDB_STEP4 | KDB_STEP3 | KDB_STEP2 | KDB_STEP1)
        !           576: 
        !           577:        ki->ki_state = ST_IDLE; /* in case init fails */
        !           578: 
        !           579:        bi_reset(&ka->kdb_bi);  /* reset bi node (but not the BI itself) */
        !           580: 
        !           581:        timo = todr() + 1000;
        !           582:        while ((ka->kdb_sa & STEP0MASK) == 0) {
        !           583:                if (todr() > timo) {
        !           584:                        printf("kdb%d: timeout during init\n", ki->ki_ctlr);
        !           585:                        return (-1);
        !           586:                }
        !           587:        }
        !           588:        if ((ka->kdb_sa & STEP0MASK) != KDB_STEP1) {
        !           589:                printf("kdb%d: init failed, sa=%b\n", ki->ki_ctlr,
        !           590:                        ka->kdb_sa, kdbsr_bits);
        !           591:                return (-1);
        !           592:        }
        !           593: 
        !           594:        /*
        !           595:         * Success!  Record new state, and start step 1 initialisation.
        !           596:         * The rest is done in the interrupt handler.
        !           597:         */
        !           598:        ki->ki_state = ST_STEP1;
        !           599:        ka->kdb_bi.bi_intrdes = 1 << mastercpu;
        !           600: #ifdef unneeded /* is it? */
        !           601:        ka->kdb_bi.bi_csr = (ka->kdb_bi.bi_csr&~BICSR_ARB_MASK)|BICSR_ARB_???;
        !           602: #endif
        !           603:        ka->kdb_bi.bi_bcicsr |= BCI_STOPEN | BCI_IDENTEN | BCI_UINTEN |
        !           604:                BCI_INTEN;
        !           605: 
        !           606: /* I THINK THIS IS WRONG */
        !           607: /* Mach uses 0x601d0, which includes IPL16, but 1d0 is IPL17, nexzvec...? */
        !           608:        ka->kdb_bi.bi_eintrcsr = BIEIC_IPL15 | ki->ki_vec;      /* ??? */
        !           609: /* END I THINK WRONG */
        !           610: 
        !           611:        ka->kdb_bi.bi_uintrcsr = ki->ki_vec;
        !           612:        ka->kdb_sw = KDB_ERR | (NCMDL2 << 11) | (NRSPL2 << 8) | KDB_IE |
        !           613:                (ki->ki_vec >> 2);
        !           614:        return (0);
        !           615: }
        !           616: 
        !           617: /*
        !           618:  * Open a drive.
        !           619:  */
        !           620: /*ARGSUSED*/
        !           621: kdbopen(dev, flag)
        !           622:        dev_t dev;
        !           623:        int flag;
        !           624: {
        !           625:        register int unit;
        !           626:        register struct uba_device *ui;
        !           627:        register struct kdbinfo *ki;
        !           628:        int s;
        !           629: 
        !           630:        /*
        !           631:         * Make sure this is a reasonable open request.
        !           632:         */
        !           633:        unit = kdbunit(dev);
        !           634:        if (unit >= NKRA || (ui = kdbdinfo[unit]) == 0 || ui->ui_alive == 0)
        !           635:                return (ENXIO);
        !           636: 
        !           637:        /*
        !           638:         * Make sure the controller is running, by (re)initialising it if
        !           639:         * necessary.
        !           640:         */
        !           641:        ki = &kdbinfo[ui->ui_ctlr];
        !           642:        s = spl5();
        !           643:        if (ki->ki_state != ST_RUN) {
        !           644:                if (ki->ki_state == ST_IDLE && kdbinit(ki)) {
        !           645:                        splx(s);
        !           646:                        return (EIO);
        !           647:                }
        !           648:                /*
        !           649:                 * In case it does not come up, make sure we will be
        !           650:                 * restarted in 10 seconds.  This corresponds to the
        !           651:                 * 10 second timeouts in kdbprobe() and kdbslave().
        !           652:                 */
        !           653:                ki->ki_flags |= KDB_DOWAKE;
        !           654:                timeout(wakeup, (caddr_t)&ki->ki_flags, 10 * hz);
        !           655:                sleep((caddr_t)&ki->ki_flags, PRIBIO);
        !           656:                if (ki->ki_state != ST_RUN) {
        !           657:                        splx(s);
        !           658:                        printf("kdb%d: controller hung\n", ui->ui_ctlr);
        !           659:                        return (EIO);
        !           660:                }
        !           661:                untimeout(wakeup, (caddr_t)&ki->ki_flags);
        !           662:        }
        !           663:        if ((ui->ui_flags & UNIT_ONLINE) == 0) {
        !           664:                /*
        !           665:                 * Bring the drive on line so we can find out how
        !           666:                 * big it is.  If it is not spun up, it will not
        !           667:                 * come on line; this cannot really be considered
        !           668:                 * an `error condition'.
        !           669:                 */
        !           670:                if (kdb_bringonline(ui, 0)) {
        !           671:                        splx(s);
        !           672:                        printf("%s%d: drive will not come on line\n",
        !           673:                                kdbdriver.ud_dname, unit);
        !           674:                        return (EIO);
        !           675:                }
        !           676:        }
        !           677:        splx(s);
        !           678:        return (0);
        !           679: }
        !           680: 
        !           681: /*
        !           682:  * Bring a drive on line.  In case it fails to respond, we set
        !           683:  * a timeout on it.  The `nosleep' parameter should be set if
        !           684:  * we are to spin-wait; otherwise this must be called at spl5().
        !           685:  */
        !           686: kdb_bringonline(ui, nosleep)
        !           687:        register struct uba_device *ui;
        !           688:        int nosleep;
        !           689: {
        !           690:        register struct kdbinfo *ki = &kdbinfo[ui->ui_ctlr];
        !           691:        register struct mscp *mp;
        !           692:        int i;
        !           693: 
        !           694:        if (nosleep) {
        !           695:                mp = mscp_getcp(&ki->ki_mi, MSCP_DONTWAIT);
        !           696:                if (mp == NULL)
        !           697:                        return (-1);
        !           698:        } else
        !           699:                mp = mscp_getcp(&ki->ki_mi, MSCP_WAIT);
        !           700:        mp->mscp_opcode = M_OP_ONLINE;
        !           701:        mp->mscp_unit = ui->ui_slave;
        !           702:        mp->mscp_cmdref = (long)&ui->ui_flags;
        !           703:        *mp->mscp_addr |= MSCP_OWN | MSCP_INT;
        !           704:        i = ki->ki_kdb->kdb_ip;
        !           705: 
        !           706:        if (nosleep) {
        !           707:                i = todr() + 1000;
        !           708:                while ((ui->ui_flags & UNIT_ONLINE) == 0)
        !           709:                        if (todr() > i)
        !           710:                                return (-1);
        !           711:        } else {
        !           712:                timeout(wakeup, (caddr_t)&ui->ui_flags, 10 * hz);
        !           713:                sleep((caddr_t)&ui->ui_flags, PRIBIO);
        !           714:                if ((ui->ui_flags & UNIT_ONLINE) == 0)
        !           715:                        return (-1);
        !           716:                untimeout(wakeup, (caddr_t)&ui->ui_flags);
        !           717:        }
        !           718:        return (0);     /* made it */
        !           719: }
        !           720: 
        !           721: /*
        !           722:  * Queue a transfer request, and if possible, hand it to the controller.
        !           723:  *
        !           724:  * This routine is broken into two so that the internal version
        !           725:  * kdbstrat1() can be called by the (nonexistent, as yet) bad block
        !           726:  * revectoring routine.
        !           727:  */
        !           728: kdbstrategy(bp)
        !           729:        register struct buf *bp;
        !           730: {
        !           731:        register int unit;
        !           732:        register struct uba_device *ui;
        !           733:        register struct size *st;
        !           734:        daddr_t sz, maxsz;
        !           735: 
        !           736:        /*
        !           737:         * Make sure this is a reasonable drive to use.
        !           738:         */
        !           739:        if ((unit = kdbunit(bp->b_dev)) >= NKRA ||
        !           740:            (ui = kdbdinfo[unit]) == NULL || ui->ui_alive == 0) {
        !           741:                bp->b_error = ENXIO;
        !           742:                bp->b_flags |= B_ERROR;
        !           743:                biodone(bp);
        !           744:                return;
        !           745:        }
        !           746: 
        !           747:        /*
        !           748:         * Determine the size of the transfer, and make sure it is
        !           749:         * within the boundaries of the drive.
        !           750:         */
        !           751:        sz = (bp->b_bcount + 511) >> 9;
        !           752:        st = &kdbtypes[ui->ui_type].ut_sizes[kdbpart(bp->b_dev)];
        !           753:        if ((maxsz = st->nblocks) < 0)
        !           754:                maxsz = ra_dsize[unit] - st->blkoff;
        !           755:        if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz ||
        !           756:            st->blkoff >= ra_dsize[unit]) {
        !           757:                /* if exactly at end of disk, return an EOF */
        !           758:                if (bp->b_blkno == maxsz)
        !           759:                        bp->b_resid = bp->b_bcount;
        !           760:                else {
        !           761:                        bp->b_error = EINVAL;
        !           762:                        bp->b_flags |= B_ERROR;
        !           763:                }
        !           764:                biodone(bp);
        !           765:                return;
        !           766:        }
        !           767:        kdbstrat1(bp);
        !           768: }
        !           769: 
        !           770: /*
        !           771:  * Work routine for kdbstrategy.
        !           772:  */
        !           773: kdbstrat1(bp)
        !           774:        register struct buf *bp;
        !           775: {
        !           776:        register int unit = kdbunit(bp->b_dev);
        !           777:        register struct buf *dp;
        !           778:        register struct kdbinfo *ki;
        !           779:        struct uba_device *ui;
        !           780:        int s;
        !           781: 
        !           782:        /*
        !           783:         * Append the buffer to the drive queue, and if it is not
        !           784:         * already there, the drive to the controller queue.  (However,
        !           785:         * if the drive queue is marked to be requeued, we must be
        !           786:         * awaiting an on line or get unit status command; in this
        !           787:         * case, leave it off the controller queue.)
        !           788:         */
        !           789:        ui = kdbdinfo[unit];
        !           790:        ki = &kdbinfo[ui->ui_ctlr];
        !           791:        dp = &kdbutab[unit];
        !           792:        s = spl5();
        !           793:        APPEND(bp, dp, av_forw);
        !           794:        if (dp->b_active == 0 && (ui->ui_flags & UNIT_REQUEUE) == 0) {
        !           795:                APPEND(dp, &ki->ki_tab, b_forw);
        !           796:                dp->b_active++;
        !           797:        }
        !           798: 
        !           799:        /*
        !           800:         * Start activity on the controller.
        !           801:         */
        !           802:        kdbstart(ki);
        !           803:        splx(s);
        !           804: }
        !           805: 
        !           806: /*
        !           807:  * Find the physical address of some contiguous PTEs that map the
        !           808:  * transfer described in `bp', creating them (by copying) if
        !           809:  * necessary.  Store the physical base address of the map through
        !           810:  * mapbase, and the page offset through offset, and any resource
        !           811:  * information in *info (or 0 if none).
        !           812:  *
        !           813:  * If we cannot allocate space, return a nonzero status.
        !           814:  */
        !           815: int
        !           816: kdbmap(ki, bp, mapbase, offset, info)
        !           817:        struct kdbinfo *ki;
        !           818:        register struct buf *bp;
        !           819:        long *mapbase, *offset;
        !           820:        int *info;
        !           821: {
        !           822:        register struct pte *spte, *dpte;
        !           823:        register struct proc *rp;
        !           824:        register int i, a, o;
        !           825:        u_int v;
        !           826:        int npf;
        !           827: 
        !           828:        o = (int)bp->b_un.b_addr & PGOFSET;
        !           829: 
        !           830:        /* handle contiguous cases */
        !           831:        if ((bp->b_flags & B_PHYS) == 0) {
        !           832:                spte = kvtopte(bp->b_un.b_addr);
        !           833:                kdbstats.ks_sys++;
        !           834:                *mapbase = PHYS(long, spte);
        !           835:                *offset = o;
        !           836:                *info = 0;
        !           837:                return (0);
        !           838:        }
        !           839:        if (bp->b_flags & B_PAGET) {
        !           840:                spte = &Usrptmap[btokmx((struct pte *)bp->b_un.b_addr)];
        !           841: if (spte->pg_v == 0) panic("kdbmap");
        !           842:                kdbstats.ks_paget++;
        !           843:                *mapbase = PHYS(long, spte);
        !           844:                *offset = o;
        !           845:                *info = 0;
        !           846:                return (0);
        !           847:        }
        !           848: 
        !           849:        /* potentially discontiguous or invalid ptes */
        !           850:        v = btop(bp->b_un.b_addr);
        !           851:        rp = bp->b_flags & B_DIRTY ? &proc[2] : bp->b_proc;
        !           852:        if (bp->b_flags & B_UAREA)
        !           853:                spte = &rp->p_addr[v];
        !           854:        else
        !           855:                spte = vtopte(rp, v);
        !           856:        npf = btoc(bp->b_bcount + o);
        !           857: 
        !           858: #ifdef notdef
        !           859:        /*
        !           860:         * The current implementation of the VM system requires
        !           861:         * that all of these be done with a copy.  Even if the
        !           862:         * PTEs could be used now, they may be snatched out from
        !           863:         * under us later.  It would be nice if we could stop that....
        !           864:         */
        !           865: 
        !           866:        /* check for invalid */
        !           867:        /* CONSIDER CHANGING VM TO VALIDATE PAGES EARLIER */
        !           868:        for (dpte = spte, i = npf; --i >= 0; dpte++)
        !           869:                if (dpte->pg_v == 0)
        !           870:                        goto copy1;
        !           871:        /*
        !           872:         * Check for discontiguous physical pte addresses.  It is
        !           873:         * not necessary to check each pte, since they come in clumps
        !           874:         * of pages.
        !           875:         */
        !           876:        i = howmany(npf + (((int)spte & PGOFSET) / sizeof (*spte)), NPTEPG);
        !           877:        /* often i==1, and we can avoid work */
        !           878:        if (--i > 0) {
        !           879:                dpte = kvtopte(spte);
        !           880:                a = dpte->pg_pfnum;
        !           881:                while (--i >= 0)
        !           882:                        if ((++dpte)->pg_pfnum != ++a)
        !           883:                                goto copy2;
        !           884:        }
        !           885: 
        !           886:        /* made it */
        !           887:        kdbstats.ks_contig++;
        !           888:        *mapbase = kvtophys(spte);
        !           889:        *offset = o;
        !           890:        *info = 0;
        !           891:        return (0);
        !           892: 
        !           893: copy1:
        !           894:        kdbstats.ks_inval++;            /* temp */
        !           895: copy2:
        !           896: #endif /* notdef */
        !           897:        kdbstats.ks_copies++;
        !           898:        i = npf + 1;
        !           899:        if ((a = rmalloc(ki->ki_map, (long)i)) == 0) {
        !           900:                kdbstats.ks_mapwait++;
        !           901:                return (-1);
        !           902:        }
        !           903:        *info = (i << 16) | a;
        !           904:        a--;
        !           905:        /* if offset > PGOFSET, btop(offset) indexes mapbase */
        !           906:        *mapbase = ki->ki_ptephys;
        !           907:        *offset = (a << PGSHIFT) | o;
        !           908:        dpte = &ki->ki_pte[a];
        !           909:        while (--i > 0)
        !           910:                *(int *)dpte++ = PG_V | *(int *)spte++;
        !           911:        *(int *)dpte = 0;
        !           912:        return (0);
        !           913: }
        !           914: 
        !           915: #define        KDBFREE(ki, info) if (info) \
        !           916:        rmfree((ki)->ki_map, (long)((info) >> 16), (long)((info) & 0xffff))
        !           917: 
        !           918: /*
        !           919:  * Start up whatever transfers we can find.
        !           920:  * Note that kdbstart() must be called at spl5().
        !           921:  */
        !           922: kdbstart(ki)
        !           923:        register struct kdbinfo *ki;
        !           924: {
        !           925:        register struct buf *bp, *dp;
        !           926:        register struct mscp *mp;
        !           927:        register struct uba_device *ui;
        !           928:        long mapbase, offset;
        !           929:        int info, ncmd = 0;
        !           930: 
        !           931:        /*
        !           932:         * If it is not running, try (again and again...) to initialise
        !           933:         * it.  If it is currently initialising just ignore it for now.
        !           934:         */
        !           935:        if (ki->ki_state != ST_RUN) {
        !           936:                if (ki->ki_state == ST_IDLE && kdbinit(ki))
        !           937:                        printf("kdb%d: still hung\n", ki->ki_ctlr);
        !           938:                return;
        !           939:        }
        !           940: 
        !           941: loop:
        !           942:        /* if insufficient credit, avoid overhead */
        !           943:        if (ki->ki_mi.mi_credits <= MSCP_MINCREDITS)
        !           944:                goto out;
        !           945: 
        !           946:        /*
        !           947:         * Service the drive at the head of the queue.  It may not
        !           948:         * need anything; eventually this will finish up the close
        !           949:         * protocol, but that is yet to be implemented here.
        !           950:         */
        !           951:        if ((dp = ki->ki_tab.b_actf) == NULL)
        !           952:                goto out;
        !           953:        if ((bp = dp->b_actf) == NULL) {
        !           954:                dp->b_active = 0;
        !           955:                ki->ki_tab.b_actf = dp->b_forw;
        !           956:                goto loop;
        !           957:        }
        !           958: 
        !           959:        if (ki->ki_kdb->kdb_sa & KDB_ERR) {     /* ctlr fatal error */
        !           960:                kdbsaerror(ki);
        !           961:                goto out;
        !           962:        }
        !           963: 
        !           964:         /* find or create maps for this transfer */
        !           965:         if (kdbmap(ki, bp, &mapbase, &offset, &info))
        !           966:                goto out;       /* effectively, resource wait */
        !           967: 
        !           968:        /*
        !           969:         * Get an MSCP packet, then figure out what to do.  If
        !           970:         * we cannot get a command packet, the command ring may
        !           971:         * be too small:  We should have at least as many command
        !           972:         * packets as credits, for best performance.
        !           973:         */
        !           974:        if ((mp = mscp_getcp(&ki->ki_mi, MSCP_DONTWAIT)) == NULL) {
        !           975:                if (ki->ki_mi.mi_credits > MSCP_MINCREDITS &&
        !           976:                    (ki->ki_flags & KDB_GRIPED) == 0) {
        !           977:                        log(LOG_NOTICE, "kdb%d: command ring too small\n",
        !           978:                                ki->ki_ctlr);
        !           979:                        ki->ki_flags |= KDB_GRIPED;/* complain only once */
        !           980:                }
        !           981:                KDBFREE(ki, info);
        !           982:                goto out;
        !           983:        }
        !           984: 
        !           985:        /*
        !           986:         * Bring the drive on line if it is not already.  Get its status
        !           987:         * if we do not already have it.  Otherwise just start the transfer.
        !           988:         */
        !           989:        ui = kdbdinfo[kdbunit(bp->b_dev)];
        !           990:        if ((ui->ui_flags & UNIT_ONLINE) == 0) {
        !           991:                mp->mscp_opcode = M_OP_ONLINE;
        !           992:                goto common;
        !           993:        }
        !           994:        if ((ui->ui_flags & UNIT_HAVESTATUS) == 0) {
        !           995:                mp->mscp_opcode = M_OP_GETUNITST;
        !           996: common:
        !           997: if (ui->ui_flags & UNIT_REQUEUE) panic("kdbstart");
        !           998:                /*
        !           999:                 * Take the drive off the controller queue.  When the
        !          1000:                 * command finishes, make sure the drive is requeued.
        !          1001:                 * Give up any mapping (not needed now).  This last is
        !          1002:                 * not efficient, but is rare.
        !          1003:                 */
        !          1004:                KDBFREE(ki, info);
        !          1005:                ki->ki_tab.b_actf = dp->b_forw;
        !          1006:                dp->b_active = 0;
        !          1007:                ui->ui_flags |= UNIT_REQUEUE;
        !          1008:                mp->mscp_unit = ui->ui_slave;
        !          1009:                *mp->mscp_addr |= MSCP_OWN | MSCP_INT;
        !          1010:                ncmd++;
        !          1011:                goto loop;
        !          1012:        }
        !          1013: 
        !          1014:        mp->mscp_opcode = (bp->b_flags & B_READ) ? M_OP_READ : M_OP_WRITE;
        !          1015:        mp->mscp_unit = ui->ui_slave;
        !          1016:        mp->mscp_seq.seq_lbn = bp->b_blkno +
        !          1017:                kdbtypes[ui->ui_type].ut_sizes[kdbpart(bp->b_dev)].blkoff;
        !          1018:        mp->mscp_seq.seq_bytecount = bp->b_bcount;
        !          1019: 
        !          1020:        mp->mscp_seq.seq_buffer = offset | KDB_MAP;
        !          1021:        mp->mscp_seq.seq_mapbase = mapbase;
        !          1022: 
        !          1023:        /* profile the drive */
        !          1024:        if (ui->ui_dk >= 0) {
        !          1025:                dk_busy |= 1 << ui->ui_dk;
        !          1026:                dk_xfer[ui->ui_dk]++;
        !          1027:                dk_wds[ui->ui_dk] += bp->b_bcount >> 6;
        !          1028:        }
        !          1029: 
        !          1030:        /*
        !          1031:         * Fill in the rest of the MSCP packet and move the buffer to the
        !          1032:         * I/O wait queue.
        !          1033:         */
        !          1034:        mscp_go(&ki->ki_mi, mp, info);
        !          1035:        ncmd++;                 /* note the transfer */
        !          1036:        ki->ki_tab.b_active++;  /* another one going */
        !          1037:        goto loop;
        !          1038: 
        !          1039: out:
        !          1040:        if (ncmd >= KS_MAXC)
        !          1041:                ncmd = KS_MAXC - 1;
        !          1042:        kdbstats.ks_cmd[ncmd]++;
        !          1043:        if (ncmd)               /* start some transfers */
        !          1044:                ncmd = ki->ki_kdb->kdb_ip;
        !          1045: }
        !          1046: 
        !          1047: /* ARGSUSED */
        !          1048: kdbiodone(mi, bp, info)
        !          1049:        struct mscp_info *mi;
        !          1050:        struct buf *bp;
        !          1051:        int info;
        !          1052: {
        !          1053:        register struct kdbinfo *ki = &kdbinfo[mi->mi_ctlr];
        !          1054: 
        !          1055:        KDBFREE(ki, info);
        !          1056:        biodone(bp);
        !          1057:        ki->ki_tab.b_active--;  /* another one done */
        !          1058: }
        !          1059: 
        !          1060: /*
        !          1061:  * The error bit was set in the controller status register.  Gripe,
        !          1062:  * reset the controller, requeue pending transfers.
        !          1063:  */
        !          1064: kdbsaerror(ki)
        !          1065:        register struct kdbinfo *ki;
        !          1066: {
        !          1067: 
        !          1068:        printf("kdb%d: controller error, sa=%b\n", ki->ki_ctlr,
        !          1069:                ki->ki_kdb->kdb_sa, kdbsr_bits);
        !          1070:        mscp_requeue(&ki->ki_mi);
        !          1071:        (void) kdbinit(ki);
        !          1072: }
        !          1073: 
        !          1074: /*
        !          1075:  * Interrupt routine.  Depending on the state of the controller,
        !          1076:  * continue initialisation, or acknowledge command and response
        !          1077:  * interrupts, and process responses.
        !          1078:  */
        !          1079: kdbintr(ctlr)
        !          1080:        int ctlr;
        !          1081: {
        !          1082:        register struct kdbinfo *ki = &kdbinfo[ctlr];
        !          1083:        register struct kdb_regs *kdbaddr = ki->ki_kdb;
        !          1084:        register struct mscp *mp;
        !          1085:        register int i;
        !          1086: 
        !          1087:        ki->ki_wticks = 0;      /* reset interrupt watchdog */
        !          1088: 
        !          1089:        /*
        !          1090:         * Combinations during steps 1, 2, and 3: STEPnMASK
        !          1091:         * corresponds to which bits should be tested;
        !          1092:         * STEPnGOOD corresponds to the pattern that should
        !          1093:         * appear after the interrupt from STEPn initialisation.
        !          1094:         * All steps test the bits in ALLSTEPS.
        !          1095:         */
        !          1096: #define        ALLSTEPS        (KDB_ERR|KDB_STEP4|KDB_STEP3|KDB_STEP2|KDB_STEP1)
        !          1097: 
        !          1098: #define        STEP1MASK       (ALLSTEPS | KDB_IE | KDB_NCNRMASK)
        !          1099: #define        STEP1GOOD       (KDB_STEP2 | KDB_IE | (NCMDL2 << 3) | NRSPL2)
        !          1100: 
        !          1101: #define        STEP2MASK       (ALLSTEPS | KDB_IE | KDB_IVECMASK)
        !          1102: #define        STEP2GOOD       (KDB_STEP3 | KDB_IE | (ki->ki_vec >> 2))
        !          1103: 
        !          1104: #define        STEP3MASK       ALLSTEPS
        !          1105: #define        STEP3GOOD       KDB_STEP4
        !          1106: 
        !          1107:        switch (ki->ki_state) {
        !          1108: 
        !          1109:        case ST_IDLE:
        !          1110:                /*
        !          1111:                 * Ignore unsolicited interrupts.
        !          1112:                 */
        !          1113:                log(LOG_WARNING, "kdb%d: stray intr\n", ctlr);
        !          1114:                return;
        !          1115: 
        !          1116:        case ST_STEP1:
        !          1117:                /*
        !          1118:                 * Begin step two initialisation.
        !          1119:                 */
        !          1120:                if ((kdbaddr->kdb_sa & STEP1MASK) != STEP1GOOD) {
        !          1121:                        i = 1;
        !          1122: initfailed:
        !          1123:                        printf("kdb%d: init step %d failed, sa=%b\n",
        !          1124:                                ctlr, i, kdbaddr->kdb_sa, kdbsr_bits);
        !          1125:                        ki->ki_state = ST_IDLE;
        !          1126:                        if (ki->ki_flags & KDB_DOWAKE) {
        !          1127:                                ki->ki_flags &= ~KDB_DOWAKE;
        !          1128:                                wakeup((caddr_t)&ki->ki_flags);
        !          1129:                        }
        !          1130:                        return;
        !          1131:                }
        !          1132:                kdbaddr->kdb_sw = PHYS(int, &ki->ki_ca.ca_rspdsc[0]);
        !          1133:                ki->ki_state = ST_STEP2;
        !          1134:                return;
        !          1135: 
        !          1136:        case ST_STEP2:
        !          1137:                /*
        !          1138:                 * Begin step 3 initialisation.
        !          1139:                 */
        !          1140:                if ((kdbaddr->kdb_sa & STEP2MASK) != STEP2GOOD) {
        !          1141:                        i = 2;
        !          1142:                        goto initfailed;
        !          1143:                }
        !          1144:                kdbaddr->kdb_sw = PHYS(int, &ki->ki_ca.ca_rspdsc[0]) >> 16;
        !          1145:                ki->ki_state = ST_STEP3;
        !          1146:                return;
        !          1147: 
        !          1148:        case ST_STEP3:
        !          1149:                /*
        !          1150:                 * Set controller characteristics (finish initialisation).
        !          1151:                 */
        !          1152:                if ((kdbaddr->kdb_sa & STEP3MASK) != STEP3GOOD) {
        !          1153:                        i = 3;
        !          1154:                        goto initfailed;
        !          1155:                }
        !          1156:                i = kdbaddr->kdb_sa & 0xff;
        !          1157:                if (i != ki->ki_micro) {
        !          1158:                        ki->ki_micro = i;
        !          1159:                        printf("kdb%d: version %d model %d\n",
        !          1160:                                ctlr, i & 0xf, i >> 4);
        !          1161:                }
        !          1162: 
        !          1163:                kdbaddr->kdb_sw = KDB_GO;
        !          1164: 
        !          1165:                /* initialise hardware data structures */
        !          1166:                for (i = 0, mp = ki->ki_rsp; i < NRSP; i++, mp++) {
        !          1167:                        ki->ki_ca.ca_rspdsc[i] = MSCP_OWN | MSCP_INT |
        !          1168:                                PHYS(long, &ki->ki_rsp[i].mscp_cmdref);
        !          1169:                        mp->mscp_addr = &ki->ki_ca.ca_rspdsc[i];
        !          1170:                        mp->mscp_msglen = MSCP_MSGLEN;
        !          1171:                }
        !          1172:                for (i = 0, mp = ki->ki_cmd; i < NCMD; i++, mp++) {
        !          1173:                        ki->ki_ca.ca_cmddsc[i] = MSCP_INT |
        !          1174:                                PHYS(long, &ki->ki_cmd[i].mscp_cmdref);
        !          1175:                        mp->mscp_addr = &ki->ki_ca.ca_cmddsc[i];
        !          1176:                        mp->mscp_msglen = MSCP_MSGLEN;
        !          1177:                }
        !          1178: 
        !          1179:                /*
        !          1180:                 * Before we can get a command packet, we need some
        !          1181:                 * credits.  Fake some up to keep mscp_getcp() happy,
        !          1182:                 * get a packet, and cancel all credits (the right
        !          1183:                 * number should come back in the response to the
        !          1184:                 * SCC packet).
        !          1185:                 */
        !          1186:                ki->ki_mi.mi_credits = MSCP_MINCREDITS + 1;
        !          1187:                mp = mscp_getcp(&ki->ki_mi, MSCP_DONTWAIT);
        !          1188:                if (mp == NULL) /* `cannot happen' */
        !          1189:                        panic("kdbintr");
        !          1190:                ki->ki_mi.mi_credits = 0;
        !          1191:                mp->mscp_opcode = M_OP_SETCTLRC;
        !          1192:                mp->mscp_unit = 0;
        !          1193:                mp->mscp_sccc.sccc_ctlrflags = M_CF_ATTN | M_CF_MISC |
        !          1194:                        M_CF_THIS;
        !          1195:                *mp->mscp_addr |= MSCP_OWN | MSCP_INT;
        !          1196:                i = kdbaddr->kdb_ip;
        !          1197:                ki->ki_state = ST_SETCHAR;
        !          1198:                return;
        !          1199: 
        !          1200:        case ST_SETCHAR:
        !          1201:        case ST_RUN:
        !          1202:                /*
        !          1203:                 * Handle Set Ctlr Characteristics responses and operational
        !          1204:                 * responses (via mscp_dorsp).
        !          1205:                 */
        !          1206:                break;
        !          1207: 
        !          1208:        default:
        !          1209:                log(LOG_ERR, "kdb%d: driver bug, state %d\n", ctlr,
        !          1210:                        ki->ki_state);
        !          1211:                return;
        !          1212:        }
        !          1213: 
        !          1214:        if (kdbaddr->kdb_sa & KDB_ERR) {/* ctlr fatal error */
        !          1215:                kdbsaerror(ki);
        !          1216:                return;
        !          1217:        }
        !          1218: 
        !          1219:        /*
        !          1220:         * Handle buffer purge requests.
        !          1221:         * KDB DOES NOT HAVE BDPs
        !          1222:         */
        !          1223:        if (ki->ki_ca.ca_bdp) {
        !          1224:                printf("kdb%d: purge bdp %d\n", ctlr, ki->ki_ca.ca_bdp);
        !          1225:                panic("kdb purge");
        !          1226:        }
        !          1227: 
        !          1228:        /*
        !          1229:         * Check for response and command ring transitions.
        !          1230:         */
        !          1231:        if (ki->ki_ca.ca_rspint) {
        !          1232:                ki->ki_ca.ca_rspint = 0;
        !          1233:                mscp_dorsp(&ki->ki_mi);
        !          1234:        }
        !          1235:        if (ki->ki_ca.ca_cmdint) {
        !          1236:                ki->ki_ca.ca_cmdint = 0;
        !          1237:                MSCP_DOCMD(&ki->ki_mi);
        !          1238:        }
        !          1239:        if (ki->ki_tab.b_actf != NULL)
        !          1240:                kdbstart(ki);
        !          1241: }
        !          1242: 
        !          1243: /*
        !          1244:  * Handle an error datagram.  All we do now is decode it.
        !          1245:  */
        !          1246: kdbdgram(mi, mp)
        !          1247:        struct mscp_info *mi;
        !          1248:        struct mscp *mp;
        !          1249: {
        !          1250: 
        !          1251:        mscp_decodeerror(mi->mi_md->md_mname, mi->mi_ctlr, mp);
        !          1252: }
        !          1253: 
        !          1254: /*
        !          1255:  * The Set Controller Characteristics command finished.
        !          1256:  * Record the new state of the controller.
        !          1257:  */
        !          1258: kdbctlrdone(mi, mp)
        !          1259:        struct mscp_info *mi;
        !          1260:        struct mscp *mp;
        !          1261: {
        !          1262:        register struct kdbinfo *ki = &kdbinfo[mi->mi_ctlr];
        !          1263: 
        !          1264:        if ((mp->mscp_status & M_ST_MASK) == M_ST_SUCCESS)
        !          1265:                ki->ki_state = ST_RUN;
        !          1266:        else {
        !          1267:                printf("kdb%d: SETCTLRC failed, status 0x%x\n",
        !          1268:                        ki->ki_ctlr, mp->mscp_status);
        !          1269:                ki->ki_state = ST_IDLE;
        !          1270:        }
        !          1271:        if (ki->ki_flags & KDB_DOWAKE) {
        !          1272:                ki->ki_flags &= ~KDB_DOWAKE;
        !          1273:                wakeup((caddr_t)&ki->ki_flags);
        !          1274:        }
        !          1275: }
        !          1276: 
        !          1277: /*
        !          1278:  * Received a response from an as-yet unconfigured drive.  Configure it
        !          1279:  * in, if possible.
        !          1280:  */
        !          1281: kdbunconf(mi, mp)
        !          1282:        struct mscp_info *mi;
        !          1283:        register struct mscp *mp;
        !          1284: {
        !          1285: 
        !          1286:        /*
        !          1287:         * If it is a slave response, copy it to kdbslavereply for
        !          1288:         * kdbslave() to look at.
        !          1289:         */
        !          1290:        if (mp->mscp_opcode == (M_OP_GETUNITST | M_OP_END) &&
        !          1291:            (kdbinfo[mi->mi_ctlr].ki_flags & KDB_INSLAVE) != 0) {
        !          1292:                kdbslavereply = *mp;
        !          1293:                return (MSCP_DONE);
        !          1294:        }
        !          1295: 
        !          1296:        /*
        !          1297:         * Otherwise, it had better be an available attention response.
        !          1298:         */
        !          1299:        if (mp->mscp_opcode != M_OP_AVAILATTN)
        !          1300:                return (MSCP_FAILED);
        !          1301: 
        !          1302:        /* do what autoconf does */
        !          1303:        return (MSCP_FAILED);   /* not yet */
        !          1304: }
        !          1305: 
        !          1306: /*
        !          1307:  * A drive came on line.  Check its type and size.  Return DONE if
        !          1308:  * we think the drive is truly on line.  In any case, awaken anyone
        !          1309:  * sleeping on the drive on-line-ness.
        !          1310:  */
        !          1311: kdbonline(ui, mp)
        !          1312:        register struct uba_device *ui;
        !          1313:        struct mscp *mp;
        !          1314: {
        !          1315:        register int type;
        !          1316: 
        !          1317:        wakeup((caddr_t)&ui->ui_flags);
        !          1318:        if ((mp->mscp_status & M_ST_MASK) != M_ST_SUCCESS) {
        !          1319:                printf("kdb%d: attempt to bring %s%d on line failed:",
        !          1320:                        ui->ui_ctlr, kdbdriver.ud_dname, ui->ui_unit);
        !          1321:                mscp_printevent(mp);
        !          1322:                return (MSCP_FAILED);
        !          1323:        }
        !          1324: 
        !          1325:        type = mp->mscp_onle.onle_drivetype;
        !          1326:        if (type >= NTYPES || kdbtypes[type].ut_name == 0) {
        !          1327:                printf("kdb%d: %s%d: unknown type %d\n",
        !          1328:                        ui->ui_ctlr, kdbdriver.ud_dname, ui->ui_unit, type);
        !          1329:                return (MSCP_FAILED);
        !          1330:        }
        !          1331:        /*
        !          1332:         * Note any change of types.  Not sure if we should do
        !          1333:         * something special about them, or if so, what....
        !          1334:         */
        !          1335:        if (type != ui->ui_type) {
        !          1336:                printf("%s%d: changed types! was %s\n",
        !          1337:                        kdbdriver.ud_dname, ui->ui_unit,
        !          1338:                        kdbtypes[ui->ui_type].ut_name);
        !          1339:                ui->ui_type = type;
        !          1340:        }
        !          1341:        ra_dsize[ui->ui_unit] = (daddr_t) mp->mscp_onle.onle_unitsize;
        !          1342:        printf("%s%d: %s, size = %d sectors\n",
        !          1343:                kdbdriver.ud_dname, ui->ui_unit,
        !          1344:                kdbtypes[type].ut_name, ra_dsize[ui->ui_unit]);
        !          1345:        return (MSCP_DONE);
        !          1346: }
        !          1347: 
        !          1348: /*
        !          1349:  * We got some (configured) unit's status.  Return DONE if it succeeded.
        !          1350:  */
        !          1351: kdbgotstatus(ui, mp)
        !          1352:        register struct uba_device *ui;
        !          1353:        register struct mscp *mp;
        !          1354: {
        !          1355: 
        !          1356:        if ((mp->mscp_status & M_ST_MASK) != M_ST_SUCCESS) {
        !          1357:                printf("kdb%d: attempt to get status for %s%d failed:",
        !          1358:                        ui->ui_ctlr, kdbdriver.ud_dname, ui->ui_unit);
        !          1359:                mscp_printevent(mp);
        !          1360:                return (MSCP_FAILED);
        !          1361:        }
        !          1362:        /* need to record later for bad block forwarding - for now, print */
        !          1363:        printf("\
        !          1364: %s%d: unit %d, nspt %d, group %d, ngpc %d, rctsize %d, nrpt %d, nrct %d\n",
        !          1365:                kdbdriver.ud_dname, ui->ui_unit, mp->mscp_unit,
        !          1366:                mp->mscp_guse.guse_nspt, mp->mscp_guse.guse_group,
        !          1367:                mp->mscp_guse.guse_ngpc, mp->mscp_guse.guse_rctsize,
        !          1368:                mp->mscp_guse.guse_nrpt, mp->mscp_guse.guse_nrct);
        !          1369:        return (MSCP_DONE);
        !          1370: }
        !          1371: 
        !          1372: /*
        !          1373:  * A transfer failed.  We get a chance to fix or restart it.
        !          1374:  * Need to write the bad block forwaring code first....
        !          1375:  */
        !          1376: /*ARGSUSED*/
        !          1377: kdbioerror(ui, mp, bp)
        !          1378:        register struct uba_device *ui;
        !          1379:        register struct mscp *mp;
        !          1380:        struct buf *bp;
        !          1381: {
        !          1382: 
        !          1383:        if (mp->mscp_flags & M_EF_BBLKR) {
        !          1384:                /*
        !          1385:                 * A bad block report.  Eventually we will
        !          1386:                 * restart this transfer, but for now, just
        !          1387:                 * log it and give up.
        !          1388:                 */
        !          1389:                log(LOG_ERR, "%s%d: bad block report: %d%s\n",
        !          1390:                        kdbdriver.ud_dname, ui->ui_unit, mp->mscp_seq.seq_lbn,
        !          1391:                        mp->mscp_flags & M_EF_BBLKU ? " + others" : "");
        !          1392:        } else {
        !          1393:                /*
        !          1394:                 * What the heck IS a `serious exception' anyway?
        !          1395:                 */
        !          1396:                if (mp->mscp_flags & M_EF_SEREX)
        !          1397:                        log(LOG_ERR, "%s%d: serious exception reported\n",
        !          1398:                                kdbdriver.ud_dname, ui->ui_unit);
        !          1399:        }
        !          1400:        return (MSCP_FAILED);
        !          1401: }
        !          1402: 
        !          1403: 
        !          1404: #ifdef notyet
        !          1405: /*
        !          1406:  * I/O controls.  Not yet!
        !          1407:  */
        !          1408: kdbioctl(dev, cmd, flag, data)
        !          1409:        dev_t dev;
        !          1410:        int cmd, flag;
        !          1411:        caddr_t data;
        !          1412: {
        !          1413:        int error = 0;
        !          1414:        register int unit = kdbunit(dev);
        !          1415: 
        !          1416:        if (unit >= NKRA || uddinfo[unit] == NULL)
        !          1417:                return (ENXIO);
        !          1418: 
        !          1419:        switch (cmd) {
        !          1420: 
        !          1421:        case KDBIOCREPLACE:
        !          1422:                /*
        !          1423:                 * Initiate bad block replacement for the given LBN.
        !          1424:                 * (Should we allow modifiers?)
        !          1425:                 */
        !          1426:                error = EOPNOTSUPP;
        !          1427:                break;
        !          1428: 
        !          1429:        case KDBIOCGMICRO:
        !          1430:                /*
        !          1431:                 * Return the microcode revision for the KDB50 running
        !          1432:                 * this drive.
        !          1433:                 */
        !          1434:                *(int *)data = kdbinfo[kdbdinfo[unit]->ui_ctlr].ki_micro;
        !          1435:                break;
        !          1436: 
        !          1437:        case KDBIOCGSIZE:
        !          1438:                /*
        !          1439:                 * Return the size (in 512 byte blocks) of this
        !          1440:                 * disk drive.
        !          1441:                 */
        !          1442:                *(daddr_t *)data = ra_dsize[unit];
        !          1443:                break;
        !          1444: 
        !          1445:        default:
        !          1446:                error = EINVAL;
        !          1447:                break;
        !          1448:        }
        !          1449:        return (error);
        !          1450: }
        !          1451: #endif
        !          1452: 
        !          1453: #ifdef notyet
        !          1454: /*
        !          1455:  * Reset a KDB50 (self test and all).
        !          1456:  * What if it fails?
        !          1457:  */
        !          1458: kdbreset(ki)
        !          1459:        register struct kdbinfo *ki;
        !          1460: {
        !          1461: 
        !          1462:        printf("reset kdb%d", ki->ki_ctlr);
        !          1463:        bi_selftest(&ki->ki_kdb.kdb_bi);
        !          1464:        ki->ki_state = ST_IDLE;
        !          1465:        rminit(ki->ki_map, (long)KI_PTES, (long)1, "kdb", KI_MAPSIZ);
        !          1466:        mscp_requeue(&ki->ki_mi);
        !          1467:        if (kdbinit(ctlr))
        !          1468:                printf(" (hung)");
        !          1469:        printf("\n");
        !          1470: }
        !          1471: #endif
        !          1472: 
        !          1473: /*
        !          1474:  * Watchdog timer:  If the controller is active, and no interrupts
        !          1475:  * have occurred for 30 seconds, assume it has gone away.
        !          1476:  */
        !          1477: kdbwatch()
        !          1478: {
        !          1479:        register struct kdbinfo *ki;
        !          1480:        register int i;
        !          1481: 
        !          1482:        timeout(kdbwatch, (caddr_t)0, hz);      /* every second */
        !          1483:        for (i = 0, ki = kdbinfo; i < NKDB; i++, ki++) {
        !          1484:                if ((ki->ki_flags & KDB_ALIVE) == 0)
        !          1485:                        continue;
        !          1486:                if (ki->ki_state == ST_IDLE)
        !          1487:                        continue;
        !          1488:                if (ki->ki_state == ST_RUN && !ki->ki_tab.b_active)
        !          1489:                        ki->ki_wticks = 0;
        !          1490:                else if (++ki->ki_wticks >= 30) {
        !          1491:                        ki->ki_wticks = 0;
        !          1492:                        printf("kdb%d: lost interrupt\n", i);
        !          1493:                        /* kdbreset(ki); */
        !          1494:                        panic("kdb lost interrupt");
        !          1495:                }
        !          1496:        }
        !          1497: }
        !          1498: 
        !          1499: /*
        !          1500:  * Do a panic dump.
        !          1501:  */
        !          1502: #define        DBSIZE  32              /* dump 16K at a time */
        !          1503: 
        !          1504: struct kdbdumpspace {
        !          1505:        struct  kdb1ca kd_ca;
        !          1506:        struct  mscp kd_rsp;
        !          1507:        struct  mscp kd_cmd;
        !          1508: } kdbdumpspace;
        !          1509: 
        !          1510: kdbdump(dev)
        !          1511:        dev_t dev;
        !          1512: {
        !          1513:        register struct kdbdumpspace *kd;
        !          1514:        register struct kdb_regs *k;
        !          1515:        register int i;
        !          1516:        struct uba_device *ui;
        !          1517:        char *start;
        !          1518:        int num, blk, unit, maxsz, blkoff;
        !          1519: 
        !          1520:        /*
        !          1521:         * Make sure the device is a reasonable place on which to dump.
        !          1522:         */
        !          1523:        unit = kdbunit(dev);
        !          1524:        if (unit >= NKRA)
        !          1525:                return (ENXIO);
        !          1526:        ui = PHYS(struct uba_device *, kdbdinfo[unit]);
        !          1527:        if (ui == NULL || ui->ui_alive == 0)
        !          1528:                return (ENXIO);
        !          1529: 
        !          1530:        /*
        !          1531:         * Find and initialise the KDB; get the physical address of the
        !          1532:         * device registers, and of communications area and command and
        !          1533:         * response packet.
        !          1534:         */
        !          1535:        k = PHYS(struct kdbinfo *, &kdbinfo[ui->ui_ctlr])->ki_physkdb;
        !          1536:        kd = PHYS(struct kdbdumpspace *, &kdbdumpspace);
        !          1537: 
        !          1538:        /*
        !          1539:         * Initialise the controller, with one command and one response
        !          1540:         * packet.
        !          1541:         */
        !          1542:        bi_reset(&k->kdb_bi);
        !          1543:        if (kdbdumpwait(k, KDB_STEP1))
        !          1544:                return (EFAULT);
        !          1545:        k->kdb_sw = KDB_ERR;
        !          1546:        if (kdbdumpwait(k, KDB_STEP2))
        !          1547:                return (EFAULT);
        !          1548:        k->kdb_sw = (int)&kd->kd_ca.ca_rspdsc;
        !          1549:        if (kdbdumpwait(k, KDB_STEP3))
        !          1550:                return (EFAULT);
        !          1551:        k->kdb_sw = ((int)&kd->kd_ca.ca_rspdsc) >> 16;
        !          1552:        if (kdbdumpwait(k, KDB_STEP4))
        !          1553:                return (EFAULT);
        !          1554:        k->kdb_sw = KDB_GO;
        !          1555: 
        !          1556:        /*
        !          1557:         * Set up the command and response descriptor, then set the
        !          1558:         * controller characteristics and bring the drive on line.
        !          1559:         * Note that all uninitialised locations in kd_cmd are zero.
        !          1560:         */
        !          1561:        kd->kd_ca.ca_rspdsc = (long)&kd->kd_rsp.mscp_cmdref;
        !          1562:        kd->kd_ca.ca_cmddsc = (long)&kd->kd_cmd.mscp_cmdref;
        !          1563:        /* kd->kd_cmd.mscp_sccc.sccc_ctlrflags = 0; */
        !          1564:        /* kd->kd_cmd.mscp_sccc.sccc_version = 0; */
        !          1565:        if (kdbdumpcmd(M_OP_SETCTLRC, k, kd, ui->ui_ctlr))
        !          1566:                return (EFAULT);
        !          1567:        kd->kd_cmd.mscp_unit = ui->ui_slave;
        !          1568:        if (kdbdumpcmd(M_OP_ONLINE, k, kd, ui->ui_ctlr))
        !          1569:                return (EFAULT);
        !          1570: 
        !          1571:        /*
        !          1572:         * Pick up the drive type from the on line end packet;
        !          1573:         * convert that to a dump area size and a disk offset.
        !          1574:         * Note that the assembler uses pc-relative addressing
        !          1575:         * to get at kdbtypes[], no need for PHYS().
        !          1576:         */
        !          1577:        i = kd->kd_rsp.mscp_onle.onle_drivetype;
        !          1578:        if (i >= NTYPES || kdbtypes[i].ut_name == 0) {
        !          1579:                printf("disk type %d unknown\ndump ");
        !          1580:                return (EINVAL);
        !          1581:        }
        !          1582:        printf("on %s ", kdbtypes[i].ut_name);
        !          1583: 
        !          1584:        maxsz = kdbtypes[i].ut_sizes[kdbpart(dev)].nblocks;
        !          1585:        blkoff = kdbtypes[i].ut_sizes[kdbpart(dev)].blkoff;
        !          1586: 
        !          1587:        /*
        !          1588:         * Dump all of physical memory, or as much as will fit in the
        !          1589:         * space provided.
        !          1590:         */
        !          1591:        start = 0;
        !          1592:        num = maxfree;
        !          1593:        if (dumplo < 0)
        !          1594:                return (EINVAL);
        !          1595:        if (dumplo + num >= maxsz)
        !          1596:                num = maxsz - dumplo;
        !          1597:        blkoff += dumplo;
        !          1598: 
        !          1599:        /*
        !          1600:         * Write out memory, DBSIZE pages at a time.
        !          1601:         * N.B.: this code depends on the fact that the sector
        !          1602:         * size == the page size.
        !          1603:         */
        !          1604:        while (num > 0) {
        !          1605:                blk = num > DBSIZE ? DBSIZE : num;
        !          1606:                kd->kd_cmd.mscp_unit = ui->ui_slave;
        !          1607:                kd->kd_cmd.mscp_seq.seq_lbn = btop(start) + blkoff;
        !          1608:                kd->kd_cmd.mscp_seq.seq_bytecount = blk << PGSHIFT;
        !          1609:                kd->kd_cmd.mscp_seq.seq_buffer = (long)start | KDB_PHYS;
        !          1610:                if (kdbdumpcmd(M_OP_WRITE, k, kd, ui->ui_ctlr))
        !          1611:                        return (EIO);
        !          1612:                start += blk << PGSHIFT;
        !          1613:                num -= blk;
        !          1614:        }
        !          1615:        return (0);             /* made it! */
        !          1616: }
        !          1617: 
        !          1618: /*
        !          1619:  * Wait for some of the bits in `bits' to come on.  If the error bit
        !          1620:  * comes on, or ten seconds pass without response, return true (error).
        !          1621:  */
        !          1622: kdbdumpwait(k, bits)
        !          1623:        register struct kdb_regs *k;
        !          1624:        register int bits;
        !          1625: {
        !          1626:        register int timo = todr() + 1000;
        !          1627: 
        !          1628:        while ((k->kdb_sa & bits) == 0) {
        !          1629:                if (k->kdb_sa & KDB_ERR) {
        !          1630:                        printf("kdb_sa=%b\ndump ", k->kdb_sa, kdbsr_bits);
        !          1631:                        return (1);
        !          1632:                }
        !          1633:                if (todr() >= timo) {
        !          1634:                        printf("timeout\ndump ");
        !          1635:                        return (1);
        !          1636:                }
        !          1637:        }
        !          1638:        return (0);
        !          1639: }
        !          1640: 
        !          1641: /*
        !          1642:  * Feed a command to the KDB50, wait for its response, and return
        !          1643:  * true iff something went wrong.
        !          1644:  */
        !          1645: kdbdumpcmd(op, k, kd, ctlr)
        !          1646:        int op;
        !          1647:        register struct kdb_regs *k;
        !          1648:        register struct kdbdumpspace *kd;
        !          1649:        int ctlr;
        !          1650: {
        !          1651:        register int n;
        !          1652: #define mp (&kd->kd_rsp)
        !          1653: 
        !          1654:        kd->kd_cmd.mscp_opcode = op;
        !          1655:        kd->kd_cmd.mscp_msglen = MSCP_MSGLEN;
        !          1656:        kd->kd_rsp.mscp_msglen = MSCP_MSGLEN;
        !          1657:        kd->kd_ca.ca_rspdsc |= MSCP_OWN | MSCP_INT;
        !          1658:        kd->kd_ca.ca_cmddsc |= MSCP_OWN | MSCP_INT;
        !          1659:        if (k->kdb_sa & KDB_ERR) {
        !          1660:                printf("kdb_sa=%b\ndump ", k->kdb_sa, kdbsr_bits);
        !          1661:                return (1);
        !          1662:        }
        !          1663:        n = k->kdb_ip;
        !          1664:        n = todr() + 1000;
        !          1665:        for (;;) {
        !          1666:                if (todr() > n) {
        !          1667:                        printf("timeout\ndump ");
        !          1668:                        return (1);
        !          1669:                }
        !          1670:                if (kd->kd_ca.ca_cmdint)
        !          1671:                        kd->kd_ca.ca_cmdint = 0;
        !          1672:                if (kd->kd_ca.ca_rspint == 0)
        !          1673:                        continue;
        !          1674:                kd->kd_ca.ca_rspint = 0;
        !          1675:                if (mp->mscp_opcode == (op | M_OP_END))
        !          1676:                        break;
        !          1677:                printf("\n");
        !          1678:                switch (MSCP_MSGTYPE(mp->mscp_msgtc)) {
        !          1679: 
        !          1680:                case MSCPT_SEQ:
        !          1681:                        printf("sequential");
        !          1682:                        break;
        !          1683: 
        !          1684:                case MSCPT_DATAGRAM:
        !          1685:                        mscp_decodeerror("kdb", ctlr, mp);
        !          1686:                        printf("datagram");
        !          1687:                        break;
        !          1688: 
        !          1689:                case MSCPT_CREDITS:
        !          1690:                        printf("credits");
        !          1691:                        break;
        !          1692: 
        !          1693:                case MSCPT_MAINTENANCE:
        !          1694:                        printf("maintenance");
        !          1695:                        break;
        !          1696: 
        !          1697:                default:
        !          1698:                        printf("unknown (type 0x%x)",
        !          1699:                                MSCP_MSGTYPE(mp->mscp_msgtc));
        !          1700:                        break;
        !          1701:                }
        !          1702:                printf(" ignored\ndump ");
        !          1703:                kd->kd_ca.ca_rspdsc |= MSCP_OWN | MSCP_INT;
        !          1704:        }
        !          1705:        if ((mp->mscp_status & M_ST_MASK) != M_ST_SUCCESS) {
        !          1706:                printf("error: op 0x%x => 0x%x status 0x%x\ndump ", op,
        !          1707:                        mp->mscp_opcode, mp->mscp_status);
        !          1708:                return (1);
        !          1709:        }
        !          1710:        return (0);
        !          1711: #undef mp
        !          1712: }
        !          1713: 
        !          1714: /*
        !          1715:  * Return the size of a partition, if known, or -1 if not.
        !          1716:  */
        !          1717: kdbsize(dev)
        !          1718:        dev_t dev;
        !          1719: {
        !          1720:        register int unit = kdbunit(dev);
        !          1721:        register struct uba_device *ui;
        !          1722:        register struct size *st;
        !          1723: 
        !          1724:        if (unit >= NKRA || (ui = kdbdinfo[unit]) == NULL || ui->ui_alive == 0)
        !          1725:                return (-1);
        !          1726:        st = &kdbtypes[ui->ui_type].ut_sizes[kdbpart(dev)];
        !          1727:        if (st->nblocks == -1) {
        !          1728:                int s = spl5();
        !          1729: 
        !          1730:                /*
        !          1731:                 * We need to have the drive on line to find the size
        !          1732:                 * of this particular partition.
        !          1733:                 * IS IT OKAY TO GO TO SLEEP IN THIS ROUTINE?
        !          1734:                 * (If not, better not page on one of these...)
        !          1735:                 */
        !          1736:                if ((ui->ui_flags & UNIT_ONLINE) == 0) {
        !          1737:                        if (kdb_bringonline(ui, 0)) {
        !          1738:                                splx(s);
        !          1739:                                return (-1);
        !          1740:                        }
        !          1741:                }
        !          1742:                splx(s);
        !          1743:                if (st->blkoff > ra_dsize[unit])
        !          1744:                        return (-1);
        !          1745:                return (ra_dsize[unit] - st->blkoff);
        !          1746:        }
        !          1747:        return (st->nblocks);
        !          1748: }
        !          1749: 
        !          1750: #endif NKDB > 0

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