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

1.1     ! root        1: /*
        !             2:  * machine-specific hardware routines,
        !             3:  * these for nautilus
        !             4:  */
        !             5: 
        !             6: #include "sys/mtpr.h"
        !             7: #include "sys/cons.h"
        !             8: 
        !             9: int delayfact = 5;     /* for DELAY macro */
        !            10: 
        !            11: #define        NICTRL  0x80    /* nmi interrupt enables: */
        !            12: #define        MEMENB  0x20    /* memory/fault */
        !            13: #define        NB1ENB  0x40    /* device 1 */
        !            14: #define        NB0ENB  0x80    /* device 0 */
        !            15: #define        COR     0x85    /* cache on */
        !            16: 
        !            17: static int nmienable = MEMENB;
        !            18: 
        !            19: /*
        !            20:  * adjust physical top of memory to useful top of memory
        !            21:  * (some vaxes put important console stuff there)
        !            22:  * called with mapping off
        !            23:  */
        !            24: machmem(hi)
        !            25: int hi;
        !            26: {
        !            27:        return (hi);
        !            28: }
        !            29: 
        !            30: /*
        !            31:  * miscellaneous machine-dependent initialization
        !            32:  * called just after mapping turned on
        !            33:  */
        !            34: machinit()
        !            35: {
        !            36: 
        !            37:        mtpr(COR, 1);           /* turn on the cache */
        !            38:        mcrinit();
        !            39:        mtpr(NICTRL, nmienable);
        !            40: }
        !            41: 
        !            42: /*
        !            43:  * enable interrupts from one of the NBIAs
        !            44:  */
        !            45: 
        !            46: setnmi(dev)
        !            47: int dev;
        !            48: {
        !            49:        nmienable |= dev ? NB1ENB : NB0ENB;
        !            50:        mtpr(NICTRL, nmienable);        
        !            51: }
        !            52: 
        !            53: /*
        !            54:  * stray interrupt handling:
        !            55:  * just decrypt it and return
        !            56:  */
        !            57: 
        !            58: long passintr;
        !            59: 
        !            60: strayintr(v)
        !            61: int v;
        !            62: {
        !            63:        if ((v & 0x1ff) == 0) {
        !            64:                passintr++;
        !            65:                return;
        !            66:        }
        !            67:        printf("stray interrupt at 0x%x == 0%o\n", v, v);       /* temp */
        !            68: }
        !            69: 
        !            70: /*
        !            71:  * read the time-of-year clock, which is buried in the wretched console
        !            72:  */
        !            73: 
        !            74: #define        CMDID   0xf
        !            75: #define        READTOY 0x8
        !            76: #define        WRITTOY 0x9
        !            77: #define        RTOYID  0xd
        !            78: #define        WTOYID  0xd
        !            79: 
        !            80: int *cniread(), *cniwrite();
        !            81: static char rtbusy, wtbusy;
        !            82: long
        !            83: gettodr()
        !            84: {
        !            85:        register int i;
        !            86:        register int *p;
        !            87:        static char rtoy = READTOY;
        !            88:        static long toy;
        !            89: 
        !            90:        if (rtbusy)
        !            91:                return (0);
        !            92:        rtbusy++;
        !            93:        for (i = 0; i < 2; i++) {
        !            94:                p = cniread(RTOYID, (char *)&toy, 4);
        !            95:                cniwrite(CMDID, &rtoy, 1);
        !            96:                if (cniwait(p, 2) == 0) {
        !            97:                        rtbusy = 0;
        !            98:                        return (toy);
        !            99:                }
        !           100:        }
        !           101:        rtbusy = 0;
        !           102:        return (0);
        !           103: }
        !           104: 
        !           105: /*
        !           106:  * set time-of-year clock
        !           107:  * 10% of the time, it is mysteriously set wrong;
        !           108:  * try a couple of times
        !           109:  */
        !           110: 
        !           111: settodr(toy)
        !           112: unsigned long toy;
        !           113: {
        !           114:        register int i;
        !           115:        register unsigned long ntoy;
        !           116: 
        !           117:        if (wtbusy)
        !           118:                return;
        !           119:        wtbusy++;
        !           120:        for (i = 0; i < 4; i++) {
        !           121:                csettodr(toy);
        !           122:                ntoy = gettodr();
        !           123:                if (ntoy >= toy && ntoy < toy + 100)
        !           124:                        break;
        !           125:        }
        !           126:        wtbusy = 0;
        !           127: }
        !           128: 
        !           129: csettodr(toy)
        !           130: long toy;
        !           131: {
        !           132:        static char wtoy = WRITTOY;
        !           133:        static long tbuf;
        !           134: 
        !           135:        if (cniwait(cniwrite(CMDID, &wtoy, 1), 2))
        !           136:                return;
        !           137:        tbuf = toy;
        !           138:        cniwait(cniwrite(WTOYID, (char *)&tbuf, 4));
        !           139: }

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