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Annotation of xinu/sys/clkinit.c, revision 1.1.1.2

1.1       root        1: #include <conf.h>
                      2: #include <kernel.h>
                      3: #include <sleep.h>
1.1.1.2 ! root        4: #ifdef ATT7300
        !             5: #include <intvectors_7300.h>
        !             6: #include <mcr7300.h>
1.1       root        7: #else
1.1.1.2 ! root        8: #include <intvectors_mecb.h>
        !             9: #include <clock.h>
1.1       root       10: #endif
                     11: 
1.1.1.2 ! root       12: extern clkint(),spurint();
        !            13: extern count6,preempt ;
        !            14: #ifdef ATT7300
        !            15: /* ATT7300 misc. control reg. is write-only, so keep copy of its normal
        !            16:    value in memory--currently only used for clock tick acknowledge */
        !            17: unsigned short soft_mcr7300 = 0;
        !            18: unsigned short *tstat ; /* global pointer to timer tstat, used in clkint.s */
        !            19: #else
        !            20: unsigned char *tstat ; /* global pointer to timer tstat, used in clkint.s */
        !            21: #endif
1.1       root       22: /*
1.1.1.2 ! root       23:  *------------------------------------------------------------------
1.1       root       24:  * clkinit - initialize the clock and sleep queue (called at startup)
1.1.1.2 ! root       25:  *------------------------------------------------------------------
1.1       root       26:  */
                     27: clkinit()
                     28: {
1.1.1.2 ! root       29:   int len;
        !            30:   int clockqtail;              /* need place to put it, but never used */
        !            31: 
        !            32:   CLOCKVEC = clkint;           /* set up interrupt vector */
        !            33:   setclkr();                   /* set  global flag clock on */
        !            34:   preempt = QUANTUM;           /* initial time quantum         */
        !            35:   count6 = 6;                  /* 60ths of a sec. counter      */
        !            36:   slnempty = FALSE;            /* initially, no process asleep */
        !            37:   clkdiff = 0;                 /* zero deferred ticks          */
        !            38:   defclk = 0;                  /* clock is not deferred        */
        !            39:   newqueue(&clockq,&clockqtail);/* allocate clock queue in q    */
        !            40: 
        !            41: #ifdef ATT7300
        !            42:   tstat = MCR7300;             /* pointer to MCR for clkint.s */
        !            43:   soft_mcr7300 |= CLRCLKINT;   /* bit was low from sys reset, make hi */
        !            44:   kprintf("starting clock...\n");
        !            45:   *MCR7300 = soft_mcr7300;     /* put new val in hardware MCR */
1.1       root       46: #else
1.1.1.2 ! root       47:   /* Added for MECB: set up timer of 68230 as line clock--      */    
        !            48:   /* specify clock int location to clock device, as int vect slot#-- */
        !            49:   SPURVEC = spurint;            /* and handle spurious ints too */ 
        !            50:   TIMER->tivr = (char)(((int)CLOCKVECADDRESS)>>2); /* i.e div by 4 */
        !            51:   /* specify downcount to be loaded at each zero detect--       */
        !            52:   /* 3 byte register at odd-addressed bytes, 1 downcount=8usec  */
        !            53:   TIMER->cpr_high = 0;
        !            54:   TIMER->cpr_med = 8;          /* approx 16 msecs apart (8*256*8=16K usec) */
        !            55:   TIMER->cpr_low = 0;          /* --i.e, approx 1/60 sec, like PDP11 clock */
        !            56:   kprintf("starting clock...\n");
        !            57:   TIMER->tcsr = (CLOCKIE|LOADFROMCPR|PRESCALE32|CLOCKON); /* start timer */
        !            58:   tstat = &TIMER->tstat; /* set up the global address of timer tstat */
        !            59:   TIMER->tstat = 1;   /* reset counter (otherwise wait to roll over, ~2min) */
1.1       root       60: #endif
                     61: }
1.1.1.2 ! root       62: 
        !            63: spurintc()
        !            64: {
        !            65:        kprintf("Received a spurious interrupt\n");
        !            66: }

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