diff options
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/mvmeppc/dev/clock.c | 274 |
1 files changed, 165 insertions, 109 deletions
diff --git a/sys/arch/mvmeppc/dev/clock.c b/sys/arch/mvmeppc/dev/clock.c index 6b479de240d..1e569a49696 100644 --- a/sys/arch/mvmeppc/dev/clock.c +++ b/sys/arch/mvmeppc/dev/clock.c @@ -1,4 +1,4 @@ -/* $OpenBSD: clock.c,v 1.6 2003/11/25 21:16:44 drahn Exp $ */ +/* $OpenBSD: clock.c,v 1.7 2004/01/26 22:55:52 miod Exp $ */ /* $NetBSD: clock.c,v 1.1 1996/09/30 16:34:40 ws Exp $ */ /* @@ -49,7 +49,7 @@ void calc_delayconst(void); */ static u_long ticks_per_sec = 3125000; static u_long ns_per_tick = 320; -static long ticks_per_intr = 0; +static long ticks_per_intr; static volatile u_long lasttb; /* @@ -63,8 +63,15 @@ static volatile u_long lasttb; #define LEAPYEAR(y) (((y) & 3) == 0) #define YEAR0 1900 -static u_long -chiptotime(int sec, int min, int hour, int day, int mon, int year); +static u_int32_t chiptotime(int, int, int, int, int, int); + +/* event tracking variables, when the next event of each time should occur */ +u_int64_t nexttimerevent, prevtb, nextstatevent; + +/* vars for stats */ +int statint; +u_int32_t statvar; +u_int32_t statmin; struct chiptime { int sec; @@ -88,8 +95,7 @@ static void timetochip(struct chiptime *c); /* ARGSUSED */ void -inittodr(base) -time_t base; +inittodr(time_t base) { int sec, min, hour, day, mon, year; @@ -118,6 +124,7 @@ time_t base; /* force failure */ time.tv_sec = 0; } + if (time.tv_sec == 0) { printf("WARNING: unable to get date/time"); /* @@ -141,7 +148,12 @@ time_t base; if (waszero || deltat < 2 * SECDAY) return; printf("WARNING: clock %s %d days", - time.tv_sec < base ? "lost" : "gained", deltat / SECDAY); + time.tv_sec < base ? "lost" : "gained", deltat / SECDAY); + + if (time.tv_sec < base && deltat > 1000 * SECDAY) { + printf(", using FS time"); + time.tv_sec = base; + } } printf(" -- CHECK AND RESET THE DATE!\n"); } @@ -151,11 +163,10 @@ time_t base; * Will Unix still be here then?? */ const short dayyr[12] = -{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334}; + { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334}; -static u_long -chiptotime(sec, min, hour, day, mon, year) -int sec, min, hour, day, mon, year; +static u_int32_t +chiptotime(int sec, int min, int hour, int day, int mon, int year) { int days, yr; @@ -180,10 +191,9 @@ int sec, min, hour, day, mon, year; } void -timetochip(c) - register struct chiptime *c; +timetochip(struct chiptime *c) { - register int t, t2, t3, now = time.tv_sec; + int t, t2, t3, now = time.tv_sec; /* January 1 1970 was a Thursday (4 in unix wdays) */ /* compute the days since the epoch */ @@ -249,132 +259,167 @@ resettodr() } } -volatile int tickspending; -#if 0 -static unsigned cnt = 1001; -#endif +volatile int statspending; + void -decr_intr(frame) - struct clockframe *frame; +decr_intr(struct clockframe *frame) { - int msr; - u_long tb; - long tick; - int nticks; - int pri; + u_int64_t tb; + u_int64_t nextevent; + int nstats; + int s; /* * Check whether we are initialized. */ if (!ticks_per_intr) return; -#if 0 - cnt++; - if (cnt > 1000) { - printf("decr int\n"); - cnt = 0; - } -#endif - intrcnt[PPC_CLK_IRQ]++; - + /* * Based on the actual time delay since the last decrementer reload, * we arrange for earlier interrupt next time. */ - asm ("mftb %0; mfdec %1" : "=r"(tb), "=r"(tick)); - for (nticks = 0; tick < 0; nticks++) - tick += ticks_per_intr; - asm volatile ("mtdec %0" :: "r"(tick)); + + tb = ppc_mftb(); + while (nexttimerevent <= tb) + nexttimerevent += ticks_per_intr; + + prevtb = nexttimerevent - ticks_per_intr; + + for (nstats = 0; nextstatevent <= tb; nstats++) { + int r; + do { + r = random() & (statvar - 1); + } while (r == 0); /* random == 0 not allowed */ + nextstatevent += statmin + r; + } + + /* only count timer ticks for CLK_IRQ */ + intrcnt[PPC_STAT_IRQ] += nstats; + + if (nexttimerevent < nextstatevent) + nextevent = nexttimerevent; + else + nextevent = nextstatevent; + /* - * lasttb is used during microtime. Set it to the virtual - * start of this tick interval. + * Need to work about the near constant skew this introduces??? + * reloading tb here could cause a missed tick. */ - lasttb = tb + tick - ticks_per_intr; - - pri = splclock(); + ppc_mtdec(nextevent - tb); - if (pri & SPL_CLOCK) { - tickspending += nticks; + if (cpl & SPL_CLOCK) { + statspending += nstats; } else { - nticks += tickspending; - tickspending = 0; + nstats += statspending; + statspending = 0; + + s = splclock(); + /* * Reenable interrupts */ - asm volatile ("mfmsr %0; ori %0, %0, %1; mtmsr %0" - : "=r"(msr) : "K"(PSL_EE)); + ppc_intr_enable(1); /* * Do standard timer interrupt stuff. * Do softclock stuff only on the last iteration. */ - frame->pri = pri | SINT_CLOCK; - while (--nticks > 0) + frame->pri = s | SINT_CLOCK; + while (lasttb < prevtb - ticks_per_intr) { + /* sync lasttb with hardclock */ + lasttb += ticks_per_intr; + intrcnt[PPC_CLK_IRQ]++; hardclock(frame); - frame->pri = pri; - hardclock(frame); - } - splx(pri); -#if 0 - if (cnt == 0) - printf("derc int done.\n"); -#endif + } + + frame->pri = s; + while (lasttb < prevtb) { + /* sync lasttb with hardclock */ + lasttb += ticks_per_intr; + intrcnt[PPC_CLK_IRQ]++; + hardclock(frame); + } + + while (nstats-- > 0) + statclock(frame); + splx(s); + ppc_intr_disable(); + + /* + * If a tick has occurred while dealing with these, + * don't service it now, delay until the next tick. + */ + } } void cpu_initclocks() { - int msr, scratch; - asm volatile ("mfmsr %0; andi. %1, %0, %2; mtmsr %1" - : "=r"(msr), "=r"(scratch) : "K"((u_short)~PSL_EE)); - asm volatile ("mftb %0" : "=r"(lasttb)); - asm volatile ("mtdec %0" :: "r"(ticks_per_intr)); - asm volatile ("mtmsr %0" :: "r"(msr)); + int intrstate; + int r; + int minint; + u_int64_t nextevent; + + intrstate = ppc_intr_disable(); + + stathz = 100; + profhz = 1000; /* must be a multiple of stathz */ + + /* init secondary clock to stathz */ + statint = ticks_per_sec / stathz; + statvar = 0x40000000; /* really big power of two */ + /* find largest 2^n which is nearly smaller than statint/2 */ + minint = statint / 2 + 100; + while (statvar > minint) + statvar >>= 1; + + statmin = statint - (statvar >> 1); + + lasttb = ppc_mftb(); + nexttimerevent = lasttb + ticks_per_intr; + do { + r = random() & (statvar - 1); + } while (r == 0); /* random == 0 not allowed */ + nextstatevent = lasttb + statmin + r; + + if (nexttimerevent < nextstatevent) + nextevent = nexttimerevent; + else + nextevent = nextstatevent; + + ppc_mtdec(nextevent - lasttb); + ppc_intr_enable(intrstate); } void -calc_delayconst() +calc_delayconst(void) { - int msr, scratch; + int s; ticks_per_sec = ppc_tps(); - asm volatile ("mfmsr %0; andi. %1, %0, %2; mtmsr %1" - : "=r"(msr), "=r"(scratch) : "K"((u_short)~PSL_EE)); + s = ppc_intr_disable(); ns_per_tick = 1000000000 / ticks_per_sec; ticks_per_intr = ticks_per_sec / hz; - asm volatile ("mtmsr %0" :: "r"(msr)); -} - -static inline u_quad_t -mftb(void) -{ - u_long scratch; - u_quad_t tb; - - asm ("1: mftbu %0; mftb %0+1; mftbu %1; cmpw 0,%0,%1; bne 1b" - : "=r"(tb), "=r"(scratch)); - return tb; + ppc_intr_enable(s); } /* * Fill in *tvp with current time with microsecond resolution. */ void -microtime(tvp) -struct timeval *tvp; +microtime(struct timeval *tvp) { - u_long tb; - u_long ticks; - int msr, scratch; - - asm volatile ("mfmsr %0; andi. %1,%0,%2; mtmsr %1" - : "=r"(msr), "=r"(scratch) : "K"((u_short)~PSL_EE)); - asm ("mftb %0" : "=r"(tb)); - ticks = (tb - lasttb) * ns_per_tick; + u_int64_t tb; + u_int32_t ticks; + int s; + + s = ppc_intr_disable(); + tb = ppc_mftb(); + ticks = ((tb - lasttb) * ns_per_tick) / 1000; *tvp = time; - asm volatile ("mtmsr %0" :: "r"(msr)); - ticks /= 1000; + ppc_intr_enable(s); tvp->tv_usec += ticks; while (tvp->tv_usec >= 1000000) { tvp->tv_usec -= 1000000; @@ -386,29 +431,40 @@ struct timeval *tvp; * Wait for about n microseconds (us) (at least!). */ void -delay(n) -unsigned n; +delay(unsigned n) { - u_quad_t tb; - u_long tbh, tbl, scratch; + u_int64_t tb; + u_int32_t tbh, tbl, scratch; - tb = mftb(); + tb = ppc_mftb(); tb += (n * 1000 + ns_per_tick - 1) / ns_per_tick; tbh = tb >> 32; - tbl = tb; + tbl = (u_int32_t)tb; asm ("1: mftbu %0; cmplw %0,%1; blt 1b; bgt 2f;" - " mftb %0; cmplw %0,%2; blt 1b; 2:" - :: "r"(scratch), "r"(tbh), "r"(tbl)); - - tb = mftb(); + " mftb %0; cmplw %0,%2; blt 1b; 2:" + :: "r"(scratch), "r"(tbh), "r"(tbl)); } -/* - * Nothing to do. - */ void -setstatclockrate(arg) -int arg; +setstatclockrate(int newhz) { - /* Do nothing */ + int minint; + int intrstate; + + intrstate = ppc_intr_disable(); + + statint = ticks_per_sec / newhz; + statvar = 0x40000000; /* really big power of two */ + /* find largest 2^n which is nearly smaller than statint/2 */ + minint = statint / 2 + 100; + while (statvar > minint) + statvar >>= 1; + + statmin = statint - (statvar >> 1); + ppc_intr_enable(intrstate); + + /* + * XXX this allows the next stat timer to occur then it switches + * to the new frequency. Rather than switching instantly. + */ } |