#include "u.h"#include "../port/lib.h"#include "mem.h"#include "dat.h"#include "fns.h"#include "io.h" #include "ureg.h" static ulong timer_incr[2] = { 0, 0, }; #define DISABLE(t, x)		t->mod &= (x ? ~0x08 : ~0x01)#define ENABLE(t, x)			t->mod = (t->mod & (x ? 0x38 : 0x7)) | (x ? (1 << 3) : (1 << 0)) typedef struct Clock0link Clock0link;typedef struct Clock0link {	void		(*clock)(void);	Clock0link*	link;} Clock0link; static Clock0link *clock0link;static Lock clock0lock;static void (*prof_fcn)(Ureg *, int); Timer*addclock0link(void (*clock)(void), int){	Clock0link *lp; 	if((lp = malloc(sizeof(Clock0link))) == 0){		print("addclock0link: too many links\n");		return nil;	}	ilock(&clock0lock);	lp->clock = clock;	lp->link = clock0link;	clock0link = lp;	iunlock(&clock0lock);	return nil;} static voidprofintr(Ureg *ur, void*){#ifdef PROF	OstmrReg *ost = OSTMRREG;	int t; 	if ((ost->osmr[3] - ost->oscr) < 2*TIMER_HZ)	{		/* less than 2 seconds before reset, say something */		setpanic();		clockpoll();		dumpregs(ur);		panic("Watchdog timer will expire");	} 	/* advance the profile clock tick */	ost->osmr[2] += timer_incr[2];	ost->ossr = (1 << 2); 			/* Clear the SR */	t = 1;	while((ost->osmr[2] - ost->oscr) > 0x80000000) {		ost->osmr[2] += timer_incr[2];		t++;	}	if (prof_fcn)		prof_fcn(ur, t);#else	USED(ur);#endif} static voidclockintr(Ureg*, void*){	Clock0link *lp; 	m->ticks++; 	checkalarms(); 	if(canlock(&clock0lock)){		for(lp = clock0link; lp; lp = lp->link)			if (lp->clock)				lp->clock();		unlock(&clock0lock);	}	intrclear(TIMERbit(0), 0);} /*intcticks(void){	return m->ticks;}*/ /* * Synchronize to the next SCLK tick boundary at best SPI rate. */voidspi_tsync(void){	/* Why has this been commented out? */ 	// don't need to waste any time here	//ulong t0; 	//t0 = OSTMR->oscr;	//while (OSTMR->oscr == t0);} voidtimerdisable( int timer ){	TimerReg *t = TIMERREG;	if ((timer < 0) || (timer > 1))		return;	intrmask(TIMERbit(timer), 0);	DISABLE(t, timer);} voidtimerenable( int timer, int Hz, void (*f)(Ureg *, void*), void* a){	TimerReg *t = TIMERREG;	if ((timer < 0) || (timer > 1))		return;	timerdisable(timer);	timer_incr[timer] = TIMER_HZ/Hz;		/* set up freq */	t->data[timer] = timer_incr[timer];	ENABLE(t, timer);	intrenable(TIMERbit(timer), f, a, 0);} voidinstallprof(void (*pf)(Ureg *, int)){#ifdef PROF	prof_fcn = pf;	timerenable( 2, HZ+1, profintr, 0);	timer_incr[2] = timer_incr[0]+63;	/* fine tuning */#else	USED(pf);#endif} voidclockinit(void){	m->ticks = 0;	timerenable(0, HZ, clockintr, 0);} voidclockpoll(void){} voidclockcheck(void){} // macros for fixed-point math ulong _mularsv(ulong m0, ulong m1, ulong a, ulong s); /* truncated: */#define FXDPTDIV(a,b,n) ((ulong)(((uvlong)(a) << (n)) / (b)))#define MAXMUL(a,n)     ((ulong)((((uvlong)1<<(n))-1)/(a)))#define MULDIV(x,a,b,n) (((x)*FXDPTDIV(a,b,n)) >> (n)) #define MULDIV64(x,a,b,n) ((ulong)_mularsv(x, FXDPTDIV(a,b,n), 0, (n))) /* rounded: */#define FXDPTDIVR(a,b,n) ((ulong)((((uvlong)(a) << (n))+((b)/2)) / (b)))#define MAXMULR(a,n)     ((ulong)((((uvlong)1<<(n))-1)/(a)))#define MULDIVR(x,a,b,n) (((x)*FXDPTDIVR(a,b,n)+(1<<((n)-1))) >> (n)) #define MULDIVR64(x,a,b,n) ((ulong)_mularsv(x, FXDPTDIVR(a,b,n), 1<<((n)-1), (n)))  // these routines are all limited to a maximum of 1165 seconds,// due to the wrap-around of the OSTIMER ulongtimer_start(void){	return TIMERREG->data[0];} ulongtimer_ticks(ulong t0){	return TIMERREG->data[0] - t0;} inttimer_devwait(ulong *adr, ulong mask, ulong val, int ost){	int i;	ulong t0 = timer_start();	while((*adr & mask) != val) 		if(timer_ticks(t0) > ost)			return ((*adr & mask) == val) ? 0 : -1;		else			for (i = 0; i < 10; i++);	/* don't pound OSCR too hard! (why not?) */	return 0;} voidtimer_setwatchdog(int t){	USED(t);} voidtimer_delay(int t){		ulong t0 = timer_start();	while(timer_ticks(t0) < t)		;}  ulongus2tmr(int us){	return MULDIV64(us, TIMER_HZ, 1000000, 24);} inttmr2us(ulong t){	return MULDIV64(t, 1000000, TIMER_HZ, 24);} voidmicrodelay(int us){	ulong t0 = timer_start();	ulong t = us2tmr(us);	while(timer_ticks(t0) <= t)		;}  ulongms2tmr(int ms){	return MULDIV64(ms, TIMER_HZ, 1000, 20);} inttmr2ms(ulong t){	return MULDIV64(t, 1000, TIMER_HZ, 32);} voiddelay(int ms){	ulong t0 = timer_start();	ulong t = ms2tmr(ms);	while(timer_ticks(t0) <= t)		clockpoll();} intsrand(){	return 0;} inttime(){	return 0;} uvlongfastticks(uvlong *hz){	if(hz)		*hz = HZ;	return m->ticks;}