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Annotation of 41BSD/sys/dev/mba.c, revision 1.1

1.1     ! root        1: /*     mba.c   4.2     11/9/80 */
        !             2: 
        !             3: #include "../h/param.h"
        !             4: #include "../h/buf.h"
        !             5: #include "../h/conf.h"
        !             6: #include "../h/systm.h"
        !             7: #include "../h/dir.h"
        !             8: #include "../h/user.h"
        !             9: #include "../h/proc.h"
        !            10: #include "../h/seg.h"
        !            11: #include "../h/pte.h"
        !            12: #include "../h/map.h"
        !            13: #include "../h/mba.h"
        !            14: #include "../h/mtpr.h"
        !            15: #include "../h/vm.h"
        !            16: 
        !            17: /*
        !            18:  * startup routine for MBA controllers.
        !            19:  */
        !            20: #define        MBAWCOM 0x30
        !            21: #define        MBARCOM 0x38
        !            22: #define        GO      01
        !            23: 
        !            24: mbastart(bp, adcr)
        !            25:        register struct buf *bp;
        !            26:        int *adcr;
        !            27: {
        !            28:        register int i;
        !            29:        int npf;
        !            30:        unsigned v;
        !            31:        register struct pte *pte, *io;
        !            32:        int o;
        !            33:        int vaddr;
        !            34:        register struct mba_regs *mbap;
        !            35:        struct proc *rp;
        !            36: 
        !            37:        mbap = mbainfo[mbanum[major(bp->b_dev)]].mi_loc;
        !            38:        io = mbap->mba_map;
        !            39:        v = btop(bp->b_un.b_addr);
        !            40:        o = (int)bp->b_un.b_addr & PGOFSET;
        !            41:        npf = btoc(bp->b_bcount + o);
        !            42:        rp = bp->b_flags&B_DIRTY ? &proc[2] : bp->b_proc;
        !            43:        vaddr = o;
        !            44:        if (bp->b_flags & B_UAREA) {
        !            45:                for (i = 0; i < UPAGES; i++) {
        !            46:                        if (rp->p_addr[i].pg_pfnum == 0)
        !            47:                                panic("mba: zero upage");
        !            48:                        *(int *)io++ = rp->p_addr[i].pg_pfnum | PG_V;
        !            49:                }
        !            50:        } else if ((bp->b_flags & B_PHYS) == 0) {
        !            51:                pte = &Sysmap[btop(((int)bp->b_un.b_addr)&0x7fffffff)];
        !            52:                while (--npf >= 0)
        !            53:                        *(int *)io++ = pte++->pg_pfnum | PG_V;
        !            54:        } else {
        !            55:                if (bp->b_flags & B_PAGET)
        !            56:                        pte = &Usrptmap[btokmx((struct pte *)bp->b_un.b_addr)];
        !            57:                else
        !            58:                        pte = vtopte(rp, v);
        !            59:                while (--npf >= 0) {
        !            60:                        if (pte->pg_pfnum == 0)
        !            61:                                panic("mba, zero entry");
        !            62:                        *(int *)io++ = pte++->pg_pfnum | PG_V;
        !            63:                }
        !            64:        }
        !            65:        *(int *)io++ = 0;
        !            66:        mbap->mba_sr = -1;      /* clear status (error) bits */
        !            67:        mbap->mba_bcr = -bp->b_bcount;
        !            68:        mbap->mba_var = vaddr;
        !            69:        if (bp->b_flags & B_READ)
        !            70:                *adcr = MBARCOM | GO;
        !            71:        else
        !            72:                *adcr = MBAWCOM | GO;
        !            73: }
        !            74: 
        !            75: mbainit(mbano)
        !            76:        int mbano;
        !            77: {
        !            78:        register struct pte *b;
        !            79:        register int i;
        !            80:        register struct mba_info *mi;
        !            81:        register struct mba_regs *mbap;
        !            82:        unsigned v;
        !            83: 
        !            84:        mi = &mbainfo[mbano];
        !            85:        v = btop((int)mi->mi_phys);
        !            86:        b = mi->mi_map;
        !            87:        for (i = 0; i < 8192; i += NBPG) {
        !            88:                *(int *)b++ = PG_V | PG_KW | v;
        !            89:                mtpr(TBIS, ptob(v));
        !            90:                v++;
        !            91:        }
        !            92:        mbap = mi->mi_loc;
        !            93:        mbap->mba_cr = MBAINIT;
        !            94:        mbap->mba_cr = MBAIE;
        !            95:        mbaact |= (1<<mbano);
        !            96: }

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