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Annotation of 41BSD/4.0.upgrade/sys/stand/mba.c, revision 1.1

1.1     ! root        1: /*     mba.c   4.3     81/03/15        */
        !             2: 
        !             3: #include "../h/param.h"
        !             4: #include "../h/inode.h"
        !             5: #include "../h/pte.h"
        !             6: #include "../h/mbareg.h"
        !             7: #include "../h/mtpr.h"
        !             8: #include "../h/vm.h"
        !             9: #include "saio.h"
        !            10: #include "savax.h"
        !            11: 
        !            12: mbastart(io, func)
        !            13:        register struct iob *io;
        !            14:        int func;
        !            15: {
        !            16:        struct mba_regs *mba = mbamba(io->i_unit);
        !            17:        struct mba_drv *drv = mbadrv(io->i_unit);
        !            18:        register struct pte *pte = mba->mba_map;
        !            19:        int npf;
        !            20:        unsigned v;
        !            21:        int o;
        !            22:        int vaddr;
        !            23: 
        !            24:        v = btop(io->i_ma);
        !            25:        o = (int)io->i_ma & PGOFSET;
        !            26:        npf = btoc(io->i_cc + o);
        !            27:        vaddr = o;
        !            28:        while (--npf >= 0)
        !            29:                *(int *)pte++ = v++ | PG_V;
        !            30:        mba->mba_sr = -1;
        !            31:        mba->mba_bcr = -io->i_cc;
        !            32:        mba->mba_var = vaddr;
        !            33:        if (func == WRITE)
        !            34:                drv->mbd_cs1 = MB_WCOM | MB_GO;
        !            35:        else
        !            36:                drv->mbd_cs1 = MB_RCOM | MB_GO;
        !            37: }
        !            38: 
        !            39: mbainit(mbanum)
        !            40:        int mbanum;
        !            41: {
        !            42:        register struct mba_regs *mba = mbaddr[mbanum];
        !            43: 
        !            44:        /* SHOULD BADADDR IT */
        !            45:        if (mbaact & (1<<mbanum))
        !            46:                return;
        !            47:        mba->mba_cr = MBCR_INIT;
        !            48:        mbaact |= 1<<mbanum;
        !            49: }

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