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#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "ureg.h"
enum {
Mclk= 25000000
};
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 void
profintr(Ureg *, void*)
{
/* TO DO: watchdog, profile on Timer 0 */
}
static void
clockintr(Ureg*, void*)
{
Clock0link *lp;
static int blip, led;
if(++blip >= HZ){
blip = 0;
ledset(led ^= 1);
}
m->ticks++;
checkalarms();
if(canlock(&clock0lock)){
for(lp = clock0link; lp; lp = lp->link)
if(lp->clock)
lp->clock();
unlock(&clock0lock);
}
/* round robin time slice is done by trap.c and proc.c */
}
void
installprof(void (*pf)(Ureg *, int))
{
USED(pf);
}
void
clockinit(void)
{
TimerReg *tr;
IntrReg *ir;
ulong l, u;
m->ticks = 0;
tr = TIMERREG;
tr->enable = 0;
tr->pulse1 = 1;
/* first tune the delay loop parameter (using a search because the counter doesn't decrement) */
ir = INTRREG;
tr->count1 = Mclk/1000 - tr->pulse1; /* millisecond */
u = m->cpuhz/(2*1000); /* over-large estimate for a millisecond */
l = 10000;
while(l+1 < u){
m->delayloop = l + (u-l)/2;
ir->st = 1<<IRQtm1; /* reset edge */
tr->enable = 1<<1;
delay(1);
tr->enable = 0;
if(ir->st & (1<<IRQtm1))
u = m->delayloop;
else
l = m->delayloop;
}
intrenable(IRQ, IRQtm1, clockintr, nil, "timer.1");
tr->count1 = Mclk/HZ - tr->pulse1;
tr->enable = 1<<1; /* enable only Timer 1 */
}
void
clockpoll(void)
{
}
void
clockcheck(void)
{
}
uvlong
fastticks(uvlong *hz)
{
if(hz)
*hz = HZ;
return m->ticks;
}
void
microdelay(int l)
{
int i;
l *= m->delayloop;
l /= 1000;
if(l <= 0)
l = 1;
for(i = 0; i < l; i++)
;
}
void
delay(int l)
{
ulong i, j;
j = m->delayloop;
while(l-- > 0)
for(i=0; i < j; i++)
;
}
/*
* for devkprof.c
*/
long
archkprofmicrosecondspertick(void)
{
return MS2HZ*1000;
}
void
archkprofenable(int)
{
/* TO DO */
}
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