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update instpermsec every 5 seconds to support varying host CPU speeds

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changes to support accurate real-time clock in devcp
changes to backstop idle instruction (BDX)
This commit is contained in:
Jim
2007-01-26 00:00:00 -05:00
parent 292af061fc
commit 55fc87a975
2 changed files with 125 additions and 40 deletions
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35
emdev.h
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@@ -539,7 +539,11 @@ int devcp (short class, short func, short device) {
static short enabled = 0;
static unsigned short clkvec;
static short clkpic;
static unsigned long ticks=0;
static struct timeval start_tv;
struct timeval tv;
unsigned long elapsedms,targetticks;
int datnow, i;
time_t unixtime;
ea_t datnowea;
@@ -572,6 +576,9 @@ int devcp (short class, short func, short device) {
//traceflags = ~TB_MAP;
//fprintf(stderr,"Clock interrupt enabled!\n");
enabled = 1;
if (gettimeofday(&start_tv, NULL) != 0)
fatal("em: gettimeofday 2 failed");
ticks = 0;
SETCLKPOLL;
/* if --map is used, lookup DATNOW symbol and set the 32-bit
@@ -627,7 +634,7 @@ int devcp (short class, short func, short device) {
if (func == 02) { /* set PIC interval */
clkpic = *(short *)(crs+A);
SETCLKPOLL;
//printf("Clock PIC interval set to %d\n", clkpic);
printf("Clock PIC interval set to %d\n", clkpic);
} else if (func == 07) {
//printf("Clock control register set to '%o\n", crs[A]);
} else if (func == 013) {
@@ -642,9 +649,31 @@ int devcp (short class, short func, short device) {
case 4:
if (enabled) {
if (intvec == -1)
if (intvec == -1) {
intvec = clkvec;
SETCLKPOLL;
ticks++;
if (gettimeofday(&tv, NULL) != 0)
fatal("em: gettimeofday 3 failed");
if (tv.tv_usec > start_tv.tv_usec)
elapsedms = (tv.tv_sec-start_tv.tv_sec)*1000 + (tv.tv_usec-start_tv.tv_usec)/1000;
else
elapsedms = (tv.tv_sec-start_tv.tv_sec-1)*1000 + (tv.tv_usec+1000000-start_tv.tv_usec)/1000;
targetticks = elapsedms/(-clkpic*3.2/1000);
if (ticks < targetticks) {
//printf("Clock catchup, elapsed=%d, target=%d, ticks=%d\n", elapsedms, targetticks, ticks);
devpoll[device] = 100; /* behind, so catch-up */
} else {
#if 0
if (ticks%1000 == 0)
printf("Clock check: target=%d, ticks=%d\n", targetticks, ticks);
#endif
SETCLKPOLL;
if (ticks > targetticks)
devpoll[device] = devpoll[device]*2;
}
} else {
devpoll[device] = 100; /* couldn't interrupt, try again soon */
}
}
break;
}