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Annotation of 42BSD/sys/stand/uba.c, revision 1.1.1.1

1.1       root        1: /*     uba.c   6.1     83/07/29        */
                      2: 
                      3: #include "../machine/pte.h"
                      4: 
                      5: #include "../h/param.h"
                      6: #include "../h/inode.h"
                      7: #include "../h/vm.h"
                      8: #include "../h/fs.h"
                      9: 
                     10: #include "../vax/cpu.h"
                     11: #include "../vaxuba/ubareg.h"
                     12: 
                     13: #include "saio.h"
                     14: #include "savax.h"
                     15: 
                     16: /*
                     17:  * Note... this routine does not
                     18:  * really allocate; unless bdp == 2
                     19:  * you always get the same space.
                     20:  * When bdp == 2 you get some other space.
                     21:  */
                     22: ubasetup(io, bdp)
                     23:        register struct iob *io;
                     24:        int bdp;
                     25: {
                     26:        int npf;
                     27:        unsigned v;
                     28:        register struct pte *pte;
                     29:        int o, temp, reg;
                     30:        static int lastreg = 128+64;
                     31: 
                     32:        v = btop(io->i_ma);
                     33:        o = (int)io->i_ma & PGOFSET;
                     34:        npf = btoc(io->i_cc + o) +1;
                     35:        if (bdp == 2) {
                     36:                reg = lastreg;
                     37:                lastreg += npf;
                     38:                bdp = 0;
                     39:        } else
                     40:                reg = 0;
                     41:        pte = &ubauba(io->i_unit)->uba_map[reg];
                     42:        temp = (bdp << 21) | UBAMR_MRV;
                     43:        if (bdp && (o & 01))
                     44:                temp |= UBAMR_BO;
                     45:        v &= 0x1fffff;                  /* drop to physical addr */
                     46:        while (--npf != 0)
                     47:                *(int *)pte++ = v++ | temp;
                     48:        *(int *)pte++ = 0;
                     49:        return ((bdp << 28) | (reg << 9) | o);
                     50: }
                     51: 
                     52: ubafree(io, mr)
                     53:        struct iob *io;
                     54:        int mr;
                     55: {
                     56:        register int bdp;
                     57:  
                     58:        bdp = (mr >> 28) & 0x0f;
                     59:        if (bdp == 0)
                     60:                return;
                     61:        switch (cpu) {
                     62: 
                     63:        case VAX_780:
                     64:                ubauba(io->i_unit)->uba_dpr[bdp] |= UBADPR_BNE;
                     65:                break;
                     66: 
                     67:        case VAX_750:
                     68:                ubauba(io->i_unit)->uba_dpr[bdp] |=
                     69:                     UBADPR_PURGE|UBADPR_NXM|UBADPR_UCE;
                     70:                break;
                     71:        case VAX_730:
                     72:                break;
                     73:        }
                     74: }

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