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Annotation of 40BSD/sys/stand/mba.c, revision 1.1

1.1     ! root        1: /*     mba.c   4.1     11/9/80 */
        !             2: 
        !             3: #include "../h/param.h"
        !             4: #include "../h/inode.h"
        !             5: #include "../h/pte.h"
        !             6: #include "../h/mba.h"
        !             7: #include "../h/mtpr.h"
        !             8: #include "../h/vm.h"
        !             9: #include "saio.h"
        !            10: 
        !            11: /*
        !            12:  * startup routine for MBA controllers.
        !            13:  */
        !            14: #define        MBAWCOM 0x30
        !            15: #define        MBARCOM 0x38
        !            16: #define        GO      01
        !            17: 
        !            18: struct mba_info mbainfo[] = {
        !            19:        PHYSMBA0,
        !            20:        PHYSMBA1,
        !            21: };
        !            22: 
        !            23: mbastart(io, adcr, func)
        !            24: register struct iob *io;
        !            25: int *adcr;
        !            26: {
        !            27:        register int i;
        !            28:        int npf;
        !            29:        unsigned v;
        !            30:        register struct pte *pte;
        !            31:        int o;
        !            32:        int vaddr;
        !            33:        extern int mbanum[], *mbaloc[];
        !            34:        register struct mba_regs *mbap;
        !            35: 
        !            36:        mbap = (struct mba_regs *)mbaloc[mbanum[io->i_ino.i_dev]];
        !            37:        pte = &mbap->mba_map[128];
        !            38:        v = btop(io->i_ma);
        !            39:        o = (int)io->i_ma & PGOFSET;
        !            40:        npf = btoc(io->i_cc + o);
        !            41:        vaddr = (128 << 9) | o;
        !            42:        v &= 0x1fffff;          /* drop to physical addr */
        !            43:        while (--npf >= 0)
        !            44:                *(int *)pte++ = v++ | PG_V;
        !            45:        mbap->mba_sr = -1;      /* clear status (error) bits */
        !            46:        mbap->mba_bcr = -io->i_cc;
        !            47:        mbap->mba_var = vaddr;
        !            48:        if (func == READ)
        !            49:                *adcr = MBARCOM | GO;
        !            50:        else if (func == WRITE) {
        !            51:                *adcr = MBAWCOM | GO;
        !            52:        }
        !            53: }
        !            54: 
        !            55: mbainit(mbanum)
        !            56:        int mbanum;
        !            57: {
        !            58:        register struct mba_regs *mbap = mbainfo[mbanum].mi_phys;
        !            59: 
        !            60:        mbap->mba_cr = MBAINIT;
        !            61:        mbaact |= 1<<mbanum;
        !            62: }

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