Return to nexstar.c CVS log

Up to [Research Unix] / researchv10dc / sys / md

Annotation of researchv10dc/sys/md/nexstar.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * stuff for dealing with io nexus on stars
        !             3:  * probably nearly identical to 8600
        !             4:  */
        !             5: 
        !             6: #include "sys/param.h"
        !             7: #include "sys/nexus.h"
        !             8: #include "sys/nxaddr.h"
        !             9: #include "sys/pte.h"
        !            10: 
        !            11: static int nexcnt;
        !            12: char *iospace;         /* an array of struct nexus */
        !            13: 
        !            14: static int nexreg(), nexwind();
        !            15: 
        !            16: /*
        !            17:  * how much address space
        !            18:  * is needed for nexus space?
        !            19:  * needed when allocating system page table
        !            20:  */
        !            21: 
        !            22: mchiopsize()
        !            23: {
        !            24:        register int i;
        !            25: 
        !            26:        for (i = 0; nextab[i].bus >= 0; i++)
        !            27:                ;
        !            28:        nexcnt = i;
        !            29:        return (i * sizeof(struct nexus));
        !            30: }
        !            31: 
        !            32: /*
        !            33:  * map appropriate parts of nexus space into kernel space
        !            34:  * called early on, before memory mapping is set up
        !            35:  * argument is the first relevant spt entry
        !            36:  */
        !            37: 
        !            38: mchiopinit(pt)
        !            39: struct pte *pt;
        !            40: {
        !            41:        register long *p;
        !            42:        register int i, n;
        !            43:        register int b;
        !            44: 
        !            45:        p = (long *)pt;
        !            46:        for (i = 0; i < nexcnt; i++) {
        !            47:                b = nexreg(&nextab[i]);
        !            48:                for (n = 0; n < btoc(NXSIZE); n++)
        !            49:                        if (b)
        !            50:                                *p++ = PG_V|PG_KW|(b+n);
        !            51:                        else
        !            52:                                *p++ = 0;
        !            53:                b = nexwind(&nextab[i]);
        !            54:                for (n = 0; n < btoc(NXWSIZE); n++)
        !            55:                        if (b)
        !            56:                                *p++ = PG_V|PG_KW|(b+n);
        !            57:                        else
        !            58:                                *p++ = 0;
        !            59:        }
        !            60: }
        !            61: 
        !            62: static
        !            63: nexreg(n)
        !            64: register struct nextab *n;
        !            65: {
        !            66:        if (n->bus)
        !            67:                return (0);     /* only one SBI */
        !            68:        if (n->adp >= 16)
        !            69:                return (0);
        !            70:        return (btoc(n->adp * NXSIZE + 0x20000000));
        !            71: }
        !            72: 
        !            73: #define        FIRSTUBA 3
        !            74: #define        LASTUBA (FIRSTUBA+4)
        !            75: 
        !            76: static
        !            77: nexwind(n)
        !            78: register struct nextab *n;
        !            79: {
        !            80:        if (n->bus)
        !            81:                return (0);     /* only one SBI */
        !            82:        if (n->adp < FIRSTUBA || n->adp > LASTUBA)
        !            83:                return (0);     /* only UBAs have windows */
        !            84:        return (btoc(0x20100000+(n->adp - FIRSTUBA)*01000000));
        !            85: }
        !            86: 
        !            87: caddr_t
        !            88: nxaddr(np)
        !            89: register struct nxaddr *np;
        !            90: {
        !            91:        if (np->adno != 0)
        !            92:                return (0);
        !            93:        if (np->nexus < 0 || np->nexus >= nexcnt)
        !            94:                return (0);
        !            95:        return((caddr_t)(iospace + np->nexus*sizeof(struct nexus)));
        !            96: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.