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Annotation of 43BSDTahoe/sys/vaxstand/mba.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)mba.c       7.6 (Berkeley) 7/9/88
        !             7:  */
        !             8: 
        !             9: #include "../machine/pte.h"
        !            10: 
        !            11: #include "param.h"
        !            12: #include "inode.h"
        !            13: #include "fs.h"
        !            14: #include "vm.h"
        !            15: 
        !            16: #include "../vax/mtpr.h"
        !            17: #include "../vaxmba/mbareg.h"
        !            18: #include "../vaxmba/hpreg.h"
        !            19: 
        !            20: #include "saio.h"
        !            21: #include "savax.h"
        !            22: 
        !            23: mbastart(io, unit, func)
        !            24:        register struct iob *io;
        !            25:        int unit, func;
        !            26: {
        !            27:        struct mba_regs *mba = mbamba(io->i_adapt);
        !            28:        struct mba_drv *drv = mbadrv(io->i_adapt, unit);
        !            29:        register struct pte *pte = mba->mba_map;
        !            30:        unsigned int v;
        !            31:        int npf, o, vaddr;
        !            32: 
        !            33:        v = btop(io->i_ma);
        !            34:        o = (int)io->i_ma & PGOFSET;
        !            35:        npf = btoc(io->i_cc + o);
        !            36:        vaddr = o;
        !            37:        while (--npf >= 0)
        !            38:                *(int *)pte++ = v++ | PG_V;
        !            39:        mba->mba_sr = -1;
        !            40:        mba->mba_bcr = -io->i_cc;
        !            41:        mba->mba_var = vaddr;
        !            42:        if (io->i_flgs&F_SSI)
        !            43:                drv->mbd_of |= HPOF_SSEI;
        !            44:        switch (io->i_flgs & F_TYPEMASK) {
        !            45: 
        !            46:        case F_RDDATA:                  /* standard read */
        !            47:                drv->mbd_cs1 = MB_RCOM|MB_GO;
        !            48:                mbawait(io, unit);
        !            49:                return(0);
        !            50: 
        !            51:        case F_WRDATA:                  /* standard write */
        !            52:                drv->mbd_cs1 = MB_WCOM|MB_GO;
        !            53:                mbawait(io, unit);
        !            54:                return(0);
        !            55: 
        !            56:        /* the following commands apply to disks only */
        !            57: 
        !            58:        case F_HDR|F_RDDATA:    
        !            59:                drv->mbd_cs1 = HP_RHDR|HP_GO;
        !            60:                break;
        !            61: 
        !            62:        case F_HDR|F_WRDATA:
        !            63:                drv->mbd_cs1 = HP_WHDR|HP_GO;
        !            64:                break;
        !            65: 
        !            66:        case F_CHECK|F_WRDATA:
        !            67:        case F_CHECK|F_RDDATA:
        !            68:                drv->mbd_cs1 = HP_WCDATA|HP_GO;
        !            69:                break;
        !            70: 
        !            71:        case F_HCHECK|F_WRDATA:
        !            72:        case F_HCHECK|F_RDDATA:
        !            73:                drv->mbd_cs1 = HP_WCHDR|HP_GO;
        !            74:                break;
        !            75: 
        !            76:        default:
        !            77:                goto error;
        !            78:        }
        !            79:        mbawait(io, unit);
        !            80:        if ((drv->mbd_dt & MBDT_TAP) == 0)
        !            81:                return (0);
        !            82: error:
        !            83:        io->i_error = ECMD;
        !            84:        io->i_flgs &= ~F_TYPEMASK;
        !            85:        return (1);
        !            86: }
        !            87: 
        !            88: mbawait(io, unit)
        !            89:        register struct iob *io;
        !            90:        int unit;
        !            91: {
        !            92:        struct mba_regs *mba = mbamba(io->i_adapt);
        !            93:        struct mba_drv *drv = mbadrv(io->i_adapt, unit);
        !            94: 
        !            95:        while (mba->mba_sr & MBSR_DTBUSY)
        !            96:                DELAY(100);
        !            97: }
        !            98: 
        !            99: mbainit(mbanum)
        !           100:        int mbanum;
        !           101: {
        !           102:        register struct mba_regs *mba;
        !           103: 
        !           104:        if (mbanum >= nmba)
        !           105:                return (0);
        !           106:        mba = mbaddr[mbanum];
        !           107:        if (badaddr((char *)mba, sizeof(long)))
        !           108:                return (0);
        !           109:        if ((mbaact & (1<<mbanum)) == 0) {
        !           110:                mba->mba_cr = MBCR_INIT;
        !           111:                mbaact |= 1<<mbanum;
        !           112:        }
        !           113:        return (1);
        !           114: }

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