Return to uba.c CVS log

Up to [CSRG BSD Unix] / 42BSD / sys / vaxuba

Annotation of 42BSD/sys/vaxuba/uba.c, revision 1.1

1.1     ! root        1: /*     uba.c   6.1     83/08/21        */
        !             2: 
        !             3: #include "../machine/pte.h"
        !             4: 
        !             5: #include "../h/param.h"
        !             6: #include "../h/systm.h"
        !             7: #include "../h/map.h"
        !             8: #include "../h/buf.h"
        !             9: #include "../h/vm.h"
        !            10: #include "../h/dir.h"
        !            11: #include "../h/user.h"
        !            12: #include "../h/proc.h"
        !            13: #include "../h/conf.h"
        !            14: #include "../h/dk.h"
        !            15: #include "../h/kernel.h"
        !            16: 
        !            17: #include "../vax/cpu.h"
        !            18: #include "../vax/mtpr.h"
        !            19: #include "../vax/nexus.h"
        !            20: #include "../vaxuba/ubareg.h"
        !            21: #include "../vaxuba/ubavar.h"
        !            22: 
        !            23: #if VAX780
        !            24: char   ubasr_bits[] = UBASR_BITS;
        !            25: #endif
        !            26: 
        !            27: /*
        !            28:  * Do transfer on device argument.  The controller
        !            29:  * and uba involved are implied by the device.
        !            30:  * We queue for resource wait in the uba code if necessary.
        !            31:  * We return 1 if the transfer was started, 0 if it was not.
        !            32:  * If you call this routine with the head of the queue for a
        !            33:  * UBA, it will automatically remove the device from the UBA
        !            34:  * queue before it returns.  If some other device is given
        !            35:  * as argument, it will be added to the request queue if the
        !            36:  * request cannot be started immediately.  This means that
        !            37:  * passing a device which is on the queue but not at the head
        !            38:  * of the request queue is likely to be a disaster.
        !            39:  */
        !            40: ubago(ui)
        !            41:        register struct uba_device *ui;
        !            42: {
        !            43:        register struct uba_ctlr *um = ui->ui_mi;
        !            44:        register struct uba_hd *uh;
        !            45:        register int s, unit;
        !            46: 
        !            47:        uh = &uba_hd[um->um_ubanum];
        !            48:        s = spl6();
        !            49:        if (um->um_driver->ud_xclu && uh->uh_users > 0 || uh->uh_xclu)
        !            50:                goto rwait;
        !            51:        um->um_ubinfo = ubasetup(um->um_ubanum, um->um_tab.b_actf->b_actf,
        !            52:            UBA_NEEDBDP|UBA_CANTWAIT);
        !            53:        if (um->um_ubinfo == 0)
        !            54:                goto rwait;
        !            55:        uh->uh_users++;
        !            56:        if (um->um_driver->ud_xclu)
        !            57:                uh->uh_xclu = 1;
        !            58:        splx(s);
        !            59:        if (ui->ui_dk >= 0) {
        !            60:                unit = ui->ui_dk;
        !            61:                dk_busy |= 1<<unit;
        !            62:                dk_xfer[unit]++;
        !            63:                dk_wds[unit] += um->um_tab.b_actf->b_actf->b_bcount>>6;
        !            64:        }
        !            65:        if (uh->uh_actf == ui)
        !            66:                uh->uh_actf = ui->ui_forw;
        !            67:        (*um->um_driver->ud_dgo)(um);
        !            68:        return (1);
        !            69: rwait:
        !            70:        if (uh->uh_actf != ui) {
        !            71:                ui->ui_forw = NULL;
        !            72:                if (uh->uh_actf == NULL)
        !            73:                        uh->uh_actf = ui;
        !            74:                else
        !            75:                        uh->uh_actl->ui_forw = ui;
        !            76:                uh->uh_actl = ui;
        !            77:        }
        !            78:        splx(s);
        !            79:        return (0);
        !            80: }
        !            81: 
        !            82: ubadone(um)
        !            83:        register struct uba_ctlr *um;
        !            84: {
        !            85:        register struct uba_hd *uh = &uba_hd[um->um_ubanum];
        !            86: 
        !            87:        if (um->um_driver->ud_xclu)
        !            88:                uh->uh_xclu = 0;
        !            89:        uh->uh_users--;
        !            90:        ubarelse(um->um_ubanum, &um->um_ubinfo);
        !            91: }
        !            92: 
        !            93: /*
        !            94:  * Allocate and setup UBA map registers, and bdp's
        !            95:  * Flags says whether bdp is needed, whether the caller can't
        !            96:  * wait (e.g. if the caller is at interrupt level).
        !            97:  *
        !            98:  * Return value:
        !            99:  *     Bits 0-8        Byte offset
        !           100:  *     Bits 9-17       Start map reg. no.
        !           101:  *     Bits 18-27      No. mapping reg's
        !           102:  *     Bits 28-31      BDP no.
        !           103:  */
        !           104: ubasetup(uban, bp, flags)
        !           105:        struct buf *bp;
        !           106: {
        !           107:        register struct uba_hd *uh = &uba_hd[uban];
        !           108:        register int temp;
        !           109:        int npf, reg, bdp;
        !           110:        unsigned v;
        !           111:        register struct pte *pte, *io;
        !           112:        struct proc *rp;
        !           113:        int a, o, ubinfo;
        !           114: 
        !           115: #if VAX730
        !           116:        if (cpu == VAX_730)
        !           117:                flags &= ~UBA_NEEDBDP;
        !           118: #endif
        !           119:        v = btop(bp->b_un.b_addr);
        !           120:        o = (int)bp->b_un.b_addr & PGOFSET;
        !           121:        npf = btoc(bp->b_bcount + o) + 1;
        !           122:        a = spl6();
        !           123:        while ((reg = rmalloc(uh->uh_map, (long)npf)) == 0) {
        !           124:                if (flags & UBA_CANTWAIT) {
        !           125:                        splx(a);
        !           126:                        return (0);
        !           127:                }
        !           128:                uh->uh_mrwant++;
        !           129:                sleep((caddr_t)&uh->uh_mrwant, PSWP);
        !           130:        }
        !           131:        bdp = 0;
        !           132:        if (flags & UBA_NEEDBDP) {
        !           133:                while ((bdp = ffs(uh->uh_bdpfree)) == 0) {
        !           134:                        if (flags & UBA_CANTWAIT) {
        !           135:                                rmfree(uh->uh_map, (long)npf, (long)reg);
        !           136:                                splx(a);
        !           137:                                return (0);
        !           138:                        }
        !           139:                        uh->uh_bdpwant++;
        !           140:                        sleep((caddr_t)&uh->uh_bdpwant, PSWP);
        !           141:                }
        !           142:                uh->uh_bdpfree &= ~(1 << (bdp-1));
        !           143:        } else if (flags & UBA_HAVEBDP)
        !           144:                bdp = (flags >> 28) & 0xf;
        !           145:        splx(a);
        !           146:        reg--;
        !           147:        ubinfo = (bdp << 28) | (npf << 18) | (reg << 9) | o;
        !           148:        temp = (bdp << 21) | UBAMR_MRV;
        !           149:        if (bdp && (o & 01))
        !           150:                temp |= UBAMR_BO;
        !           151:        rp = bp->b_flags&B_DIRTY ? &proc[2] : bp->b_proc;
        !           152:        if ((bp->b_flags & B_PHYS) == 0)
        !           153:                pte = &Sysmap[btop(((int)bp->b_un.b_addr)&0x7fffffff)];
        !           154:        else if (bp->b_flags & B_UAREA)
        !           155:                pte = &rp->p_addr[v];
        !           156:        else if (bp->b_flags & B_PAGET)
        !           157:                pte = &Usrptmap[btokmx((struct pte *)bp->b_un.b_addr)];
        !           158:        else
        !           159:                pte = vtopte(rp, v);
        !           160:        io = &uh->uh_uba->uba_map[reg];
        !           161:        while (--npf != 0) {
        !           162:                if (pte->pg_pfnum == 0)
        !           163:                        panic("uba zero uentry");
        !           164:                *(int *)io++ = pte++->pg_pfnum | temp;
        !           165:        }
        !           166:        *(int *)io++ = 0;
        !           167:        return (ubinfo);
        !           168: }
        !           169: 
        !           170: /*
        !           171:  * Non buffer setup interface... set up a buffer and call ubasetup.
        !           172:  */
        !           173: uballoc(uban, addr, bcnt, flags)
        !           174:        int uban;
        !           175:        caddr_t addr;
        !           176:        int bcnt, flags;
        !           177: {
        !           178:        struct buf ubabuf;
        !           179: 
        !           180:        ubabuf.b_un.b_addr = addr;
        !           181:        ubabuf.b_flags = B_BUSY;
        !           182:        ubabuf.b_bcount = bcnt;
        !           183:        /* that's all the fields ubasetup() needs */
        !           184:        return (ubasetup(uban, &ubabuf, flags));
        !           185: }
        !           186:  
        !           187: /*
        !           188:  * Release resources on uba uban, and then unblock resource waiters.
        !           189:  * The map register parameter is by value since we need to block
        !           190:  * against uba resets on 11/780's.
        !           191:  */
        !           192: ubarelse(uban, amr)
        !           193:        int *amr;
        !           194: {
        !           195:        register struct uba_hd *uh = &uba_hd[uban];
        !           196:        register int bdp, reg, npf, s;
        !           197:        int mr;
        !           198:  
        !           199:        /*
        !           200:         * Carefully see if we should release the space, since
        !           201:         * it may be released asynchronously at uba reset time.
        !           202:         */
        !           203:        s = spl6();
        !           204:        mr = *amr;
        !           205:        if (mr == 0) {
        !           206:                /*
        !           207:                 * A ubareset() occurred before we got around
        !           208:                 * to releasing the space... no need to bother.
        !           209:                 */
        !           210:                splx(s);
        !           211:                return;
        !           212:        }
        !           213:        *amr = 0;
        !           214:        splx(s);                /* let interrupts in, we're safe for a while */
        !           215:        bdp = (mr >> 28) & 0x0f;
        !           216:        if (bdp) {
        !           217:                switch (cpu) {
        !           218: #if VAX780
        !           219:                case VAX_780:
        !           220:                        uh->uh_uba->uba_dpr[bdp] |= UBADPR_BNE;
        !           221:                        break;
        !           222: #endif
        !           223: #if VAX750
        !           224:                case VAX_750:
        !           225:                        uh->uh_uba->uba_dpr[bdp] |=
        !           226:                            UBADPR_PURGE|UBADPR_NXM|UBADPR_UCE;
        !           227:                        break;
        !           228: #endif
        !           229:                }
        !           230:                uh->uh_bdpfree |= 1 << (bdp-1);         /* atomic */
        !           231:                if (uh->uh_bdpwant) {
        !           232:                        uh->uh_bdpwant = 0;
        !           233:                        wakeup((caddr_t)&uh->uh_bdpwant);
        !           234:                }
        !           235:        }
        !           236:        /*
        !           237:         * Put back the registers in the resource map.
        !           238:         * The map code must not be reentered, so we do this
        !           239:         * at high ipl.
        !           240:         */
        !           241:        npf = (mr >> 18) & 0x3ff;
        !           242:        reg = ((mr >> 9) & 0x1ff) + 1;
        !           243:        s = spl6();
        !           244:        rmfree(uh->uh_map, (long)npf, (long)reg);
        !           245:        splx(s);
        !           246: 
        !           247:        /*
        !           248:         * Wakeup sleepers for map registers,
        !           249:         * and also, if there are processes blocked in dgo(),
        !           250:         * give them a chance at the UNIBUS.
        !           251:         */
        !           252:        if (uh->uh_mrwant) {
        !           253:                uh->uh_mrwant = 0;
        !           254:                wakeup((caddr_t)&uh->uh_mrwant);
        !           255:        }
        !           256:        while (uh->uh_actf && ubago(uh->uh_actf))
        !           257:                ;
        !           258: }
        !           259: 
        !           260: ubapurge(um)
        !           261:        register struct uba_ctlr *um;
        !           262: {
        !           263:        register struct uba_hd *uh = um->um_hd;
        !           264:        register int bdp = (um->um_ubinfo >> 28) & 0x0f;
        !           265: 
        !           266:        switch (cpu) {
        !           267: #if VAX780
        !           268:        case VAX_780:
        !           269:                uh->uh_uba->uba_dpr[bdp] |= UBADPR_BNE;
        !           270:                break;
        !           271: #endif
        !           272: #if VAX750
        !           273:        case VAX_750:
        !           274:                uh->uh_uba->uba_dpr[bdp] |= UBADPR_PURGE|UBADPR_NXM|UBADPR_UCE;
        !           275:                break;
        !           276: #endif
        !           277:        }
        !           278: }
        !           279: 
        !           280: ubainitmaps(uhp)
        !           281:        register struct uba_hd *uhp;
        !           282: {
        !           283: 
        !           284:        rminit(uhp->uh_map, (long)NUBMREG, (long)1, "uba", UAMSIZ);
        !           285:        switch (cpu) {
        !           286: #if VAX780
        !           287:        case VAX_780:
        !           288:                uhp->uh_bdpfree = (1<<NBDP780) - 1;
        !           289:                break;
        !           290: #endif
        !           291: #if VAX750
        !           292:        case VAX_750:
        !           293:                uhp->uh_bdpfree = (1<<NBDP750) - 1;
        !           294:                break;
        !           295: #endif
        !           296: #if VAX730
        !           297:        case VAX_730:
        !           298:                break;
        !           299: #endif
        !           300:        }
        !           301: }
        !           302: 
        !           303: /*
        !           304:  * Generate a reset on uba number uban.  Then
        !           305:  * call each device in the character device table,
        !           306:  * giving it a chance to clean up so as to be able to continue.
        !           307:  */
        !           308: ubareset(uban)
        !           309:        int uban;
        !           310: {
        !           311:        register struct cdevsw *cdp;
        !           312:        register struct uba_hd *uh = &uba_hd[uban];
        !           313:        int s;
        !           314: 
        !           315:        s = spl6();
        !           316:        uh->uh_users = 0;
        !           317:        uh->uh_zvcnt = 0;
        !           318:        uh->uh_xclu = 0;
        !           319:        uh->uh_actf = uh->uh_actl = 0;
        !           320:        uh->uh_bdpwant = 0;
        !           321:        uh->uh_mrwant = 0;
        !           322:        ubainitmaps(uh);
        !           323:        wakeup((caddr_t)&uh->uh_bdpwant);
        !           324:        wakeup((caddr_t)&uh->uh_mrwant);
        !           325:        printf("uba%d: reset", uban);
        !           326:        ubainit(uh->uh_uba);
        !           327:        for (cdp = cdevsw; cdp < cdevsw + nchrdev; cdp++)
        !           328:                (*cdp->d_reset)(uban);
        !           329: #ifdef INET
        !           330:        ifubareset(uban);
        !           331: #endif
        !           332:        printf("\n");
        !           333:        splx(s);
        !           334: }
        !           335: 
        !           336: /*
        !           337:  * Init a uba.  This is called with a pointer
        !           338:  * rather than a virtual address since it is called
        !           339:  * by code which runs with memory mapping disabled.
        !           340:  * In these cases we really don't need the interrupts
        !           341:  * enabled, but since we run with ipl high, we don't care
        !           342:  * if they are, they will never happen anyways.
        !           343:  */
        !           344: ubainit(uba)
        !           345:        register struct uba_regs *uba;
        !           346: {
        !           347: 
        !           348:        switch (cpu) {
        !           349: #if VAX780
        !           350:        case VAX_780:
        !           351:                uba->uba_cr = UBACR_ADINIT;
        !           352:                uba->uba_cr = UBACR_IFS|UBACR_BRIE|UBACR_USEFIE|UBACR_SUEFIE;
        !           353:                while ((uba->uba_cnfgr & UBACNFGR_UBIC) == 0)
        !           354:                        ;
        !           355:                break;
        !           356: #endif
        !           357: #if VAX750
        !           358:        case VAX_750:
        !           359: #endif
        !           360: #if VAX730
        !           361:        case VAX_730:
        !           362: #endif
        !           363: #if defined(VAX750) || defined(VAX730)
        !           364:                mtpr(IUR, 0);
        !           365:                /* give devices time to recover from power fail */
        !           366: /* THIS IS PROBABLY UNNECESSARY */
        !           367:                DELAY(500000);
        !           368: /* END PROBABLY UNNECESSARY */
        !           369:                break;
        !           370: #endif
        !           371:        }
        !           372: }
        !           373: 
        !           374: #ifdef VAX780
        !           375: int    ubawedgecnt = 10;
        !           376: int    ubacrazy = 500;
        !           377: /*
        !           378:  * This routine is called by the locore code to
        !           379:  * process a UBA error on an 11/780.  The arguments are passed
        !           380:  * on the stack, and value-result (through some trickery).
        !           381:  * In particular, the uvec argument is used for further
        !           382:  * uba processing so the result aspect of it is very important.
        !           383:  * It must not be declared register.
        !           384:  */
        !           385: /*ARGSUSED*/
        !           386: ubaerror(uban, uh, xx, uvec, uba)
        !           387:        register int uban;
        !           388:        register struct uba_hd *uh;
        !           389:        int uvec;
        !           390:        register struct uba_regs *uba;
        !           391: {
        !           392:        register sr, s;
        !           393: 
        !           394:        if (uvec == 0) {
        !           395:                uh->uh_zvcnt++;
        !           396:                if (uh->uh_zvcnt > 250000) {
        !           397:                        printf("uba%d: too many zero vectors\n");
        !           398:                        ubareset(uban);
        !           399:                }
        !           400:                uvec = 0;
        !           401:                return;
        !           402:        }
        !           403:        if (uba->uba_cnfgr & NEX_CFGFLT) {
        !           404:                printf("uba%d: sbi fault sr=%b cnfgr=%b\n",
        !           405:                    uban, uba->uba_sr, ubasr_bits,
        !           406:                    uba->uba_cnfgr, NEXFLT_BITS);
        !           407:                ubareset(uban);
        !           408:                uvec = 0;
        !           409:                return;
        !           410:        }
        !           411:        sr = uba->uba_sr;
        !           412:        s = spl7();
        !           413:        printf("uba%d: uba error sr=%b fmer=%x fubar=%o\n",
        !           414:            uban, uba->uba_sr, ubasr_bits, uba->uba_fmer, 4*uba->uba_fubar);
        !           415:        splx(s);
        !           416:        uba->uba_sr = sr;
        !           417:        uvec &= UBABRRVR_DIV;
        !           418:        if (++uh->uh_errcnt % ubawedgecnt == 0) {
        !           419:                if (uh->uh_errcnt > ubacrazy)
        !           420:                        panic("uba crazy");
        !           421:                printf("ERROR LIMIT ");
        !           422:                ubareset(uban);
        !           423:                uvec = 0;
        !           424:                return;
        !           425:        }
        !           426:        return;
        !           427: }
        !           428: #endif
        !           429: 
        !           430: /*
        !           431:  * Allocate UNIBUS memory.  Allocates and initializes
        !           432:  * sufficient mapping registers for access.  On a 780,
        !           433:  * the configuration register is setup to disable UBA
        !           434:  * response on DMA transfers to addresses controlled
        !           435:  * by the disabled mapping registers.
        !           436:  */
        !           437: ubamem(uban, addr, npg, doalloc)
        !           438:        int uban, addr, npg, doalloc;
        !           439: {
        !           440:        register struct uba_hd *uh = &uba_hd[uban];
        !           441:        register int a;
        !           442: 
        !           443:        if (doalloc) {
        !           444:                int s = spl6();
        !           445:                a = rmget(uh->uh_map, npg, (addr >> 9) + 1);
        !           446:                splx(s);
        !           447:        } else
        !           448:                a = (addr >> 9) + 1;
        !           449:        if (a) {
        !           450:                register int i, *m;
        !           451: 
        !           452:                m = (int *)&uh->uh_uba->uba_map[a - 1];
        !           453:                for (i = 0; i < npg; i++)
        !           454:                        *m++ = 0;       /* All off, especially 'valid' */
        !           455: #if VAX780
        !           456:                /*
        !           457:                 * On a 780, set up the map register disable
        !           458:                 * field in the configuration register.  Beware
        !           459:                 * of callers that request memory ``out of order''.
        !           460:                 */
        !           461:                if (cpu == VAX_780) {
        !           462:                        int cr = uh->uh_uba->uba_cr;
        !           463: 
        !           464:                        i = (addr + npg * 512 + 8191) / 8192;
        !           465:                        if (i > (cr >> 26))
        !           466:                                uh->uh_uba->uba_cr |= i << 26;
        !           467:                }
        !           468: #endif
        !           469:        }
        !           470:        return (a);
        !           471: }
        !           472: 
        !           473: #include "ik.h"
        !           474: #if NIK > 0
        !           475: /*
        !           476:  * Map a virtual address into users address space. Actually all we
        !           477:  * do is turn on the user mode write protection bits for the particular
        !           478:  * page of memory involved.
        !           479:  */
        !           480: maptouser(vaddress)
        !           481:        caddr_t vaddress;
        !           482: {
        !           483: 
        !           484:        Sysmap[(((unsigned)(vaddress))-0x80000000) >> 9].pg_prot = (PG_UW>>27);
        !           485: }
        !           486: 
        !           487: unmaptouser(vaddress)
        !           488:        caddr_t vaddress;
        !           489: {
        !           490: 
        !           491:        Sysmap[(((unsigned)(vaddress))-0x80000000) >> 9].pg_prot = (PG_KW>>27);
        !           492: }
        !           493: #endif

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.