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

1.1     ! root        1: /*     uba.c   4.5     81/11/12        */
        !             2: 
        !             3: #include "../h/param.h"
        !             4: #include "../h/inode.h"
        !             5: #include "../h/cpu.h"
        !             6: #include "../h/pte.h"
        !             7: #include "../h/ubareg.h"
        !             8: #include "../h/vm.h"
        !             9: #include "saio.h"
        !            10: #include "savax.h"
        !            11: 
        !            12: /*
        !            13:  * Note... this routine does not
        !            14:  * really allocate; unless bdp == 2
        !            15:  * you always get the same space.
        !            16:  * When bdp == 2 you get some other space.
        !            17:  */
        !            18: ubasetup(io, bdp)
        !            19:        register struct iob *io;
        !            20:        int bdp;
        !            21: {
        !            22:        int npf;
        !            23:        unsigned v;
        !            24:        register struct pte *pte;
        !            25:        int o, temp, reg;
        !            26:        static int lastreg = 128+64;
        !            27: 
        !            28:        v = btop(io->i_ma);
        !            29:        o = (int)io->i_ma & PGOFSET;
        !            30:        npf = btoc(io->i_cc + o) +1;
        !            31:        if (bdp == 2) {
        !            32:                reg = lastreg;
        !            33:                lastreg += npf;
        !            34:                bdp = 0;
        !            35:        } else
        !            36:                reg = 0;
        !            37:        pte = &ubauba(io->i_unit)->uba_map[reg];
        !            38:        temp = (bdp << 21) | UBAMR_MRV;
        !            39:        if (bdp && (o & 01))
        !            40:                temp |= UBAMR_BO;
        !            41:        v &= 0x1fffff;                  /* drop to physical addr */
        !            42:        while (--npf != 0)
        !            43:                *(int *)pte++ = v++ | temp;
        !            44:        *(int *)pte++ = 0;
        !            45:        return ((bdp << 28) | (reg << 9) | o);
        !            46: }
        !            47: 
        !            48: ubafree(io, mr)
        !            49:        struct iob *io;
        !            50:        int mr;
        !            51: {
        !            52:        register int bdp;
        !            53:  
        !            54:        bdp = (mr >> 28) & 0x0f;
        !            55:        if (bdp == 0)
        !            56:                return;
        !            57:        switch (cpu) {
        !            58: 
        !            59:        case VAX_780:
        !            60:                ubauba(io->i_unit)->uba_dpr[bdp] |= UBADPR_BNE;
        !            61:                break;
        !            62: 
        !            63:        case VAX_750:
        !            64:                ubauba(io->i_unit)->uba_dpr[bdp] |=
        !            65:                     UBADPR_PURGE|UBADPR_NXM|UBADPR_UCE;
        !            66:                break;
        !            67:        case VAX_7ZZ:
        !            68:                break;
        !            69:        }
        !            70: }

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