ref: 21b501c27faa36e413b09b594717f8669ce4183e
dir: /sys/src/9/ppc/clock.c/
#include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "io.h" #include "fns.h" #include "ureg.h" static ulong clkreload; void delayloopinit(void) { ulong v; uvlong x; /* initial value for loopconst set in machinit */ m->loopconst = 1000; v = getdec(); delay(1000); v -= getdec(); x = m->loopconst; x *= m->dechz; x /= v; m->loopconst = x; } void clockinit(void) { m->dechz = m->bushz/4; /* true for all 604e */ m->tbhz = m->dechz; /* conjecture; manual doesn't say */ delayloopinit(); clkreload = m->dechz/HZ-1; putdec(clkreload); } void clockintr(Ureg *) { long v; v = -getdec(); if(v > (clkreload >> 1)){ if(v > clkreload) m->ticks += v/clkreload; v = 0; } putdec(clkreload-v); } void delay(int l) { ulong i, j; j = 0; if(m) j = m->loopconst; if(j == 0) j = 1096; while(l-- > 0) for(i=0; i < j; i++) ; } void microdelay(int l) { ulong i; l *= m->loopconst; l += 500; l /= 1000; if(l <= 0) l = 1; for(i = 0; i < l; i++) ; } ulong perfticks(void) { return (ulong)fastticks(nil); }