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sim_timer.c
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sim_timer.c
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/* sim_timer.c: simulator timer library
Copyright (c) 1993-2022, Robert M Supnik
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik.
27-Sep-22 RMS Removed OS/2 and Mac "Classic" support
01-Feb-21 JDB Added cast for down-conversion
22-May-17 RMS Hacked for V4.0 CONST compatibility
23-Nov-15 RMS Fixed calibration lost path to reinitialize timer
28-Mar-15 RMS Revised to use sim_printf
21-Oct-11 MP Fixed throttling in several ways:
- Sleep for the observed clock tick size while throttling
- Recompute the throttling wait once every 10 seconds
to account for varying instruction mixes during
different phases of a simulator execution or to
accommodate the presence of other load on the host
system.
- Each of the pre-existing throttling modes (Kcps,
Mcps, and %) all compute the appropriate throttling
interval dynamically. These dynamic computations
assume that 100% of the host CPU is dedicated to
the current simulator during this computation.
This assumption may not always be true and under
certain conditions may never provide a way to
correctly determine the appropriate throttling
wait. An additional throttling mode has been added
which allows the simulator operator to explicitly
state the desired throttling wait parameters.
These are specified by:
SET THROT insts/delay
where 'insts' is the number of instructions to
execute before sleeping for 'delay' milliseconds.
22-Apr-11 MP Fixed Asynch I/O support to reasonably account cycles
when an idle wait is terminated by an external event
05-Jan-11 MP Added Asynch I/O support
29-Dec-10 MP Fixed clock resolution determination for Unix platforms
22-Sep-08 RMS Added "stability threshold" for idle routine
27-May-08 RMS Fixed bug in Linux idle routines (from Walter Mueller)
18-Jun-07 RMS Modified idle to exclude counted delays
22-Mar-07 RMS Added sim_rtcn_init_all
17-Oct-06 RMS Added idle support (based on work by Mark Pizzolato)
Added throttle support
16-Aug-05 RMS Fixed C++ declaration and cast problems
02-Jan-04 RMS Split out from SCP
This library includes the following routines:
sim_timer_init - initialize timing system
sim_rtc_init - initialize calibration
sim_rtc_calb - calibrate clock
sim_idle - virtual machine idle
sim_os_msec - return elapsed time in msec
sim_os_sleep - sleep specified number of seconds
sim_os_ms_sleep - sleep specified number of milliseconds
sim_idle_ms_sleep - sleep specified number of milliseconds
or until awakened by an asynchronous
event
sim_timespec_diff subtract two timespec values
sim_timer_activate_after schedule unit for specific time
sim_timer_activate_time determine activation time
sim_timer_activate_time_usecs determine activation time in usecs
sim_rom_read_with_delay delay for default or specified delay
sim_get_rom_delay_factor get current or initialize 1usec delay factor
sim_set_rom_delay_factor set specific delay factor
The calibration, idle, and throttle routines are OS-independent; the _os_
routines are not.
*/
#define NOT_MUX_USING_CODE /* sim_tmxr library provider or agnostic */
#include "sim_defs.h"
#include <ctype.h>
#include <math.h>
#ifdef HAVE_WINMM
#include <windows.h>
#endif
#define SIM_INTERNAL_CLK (SIM_NTIMERS+(1<<30))
#define SIM_INTERNAL_UNIT sim_internal_timer_unit
#ifndef MIN
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#endif
#ifndef MAX
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#endif
uint32 sim_idle_ms_sleep (unsigned int msec);
/* MS_MIN_GRANULARITY exists here so that timing behavior for hosts systems */
/* with slow clock ticks can be assessed and tested without actually having */
/* that slow a clock tick on the development platform */
//#define MS_MIN_GRANULARITY 20 /* Uncomment to simulate 20ms host tick size.*/
/* some Solaris and BSD hosts come this way */
#if defined(MS_MIN_GRANULARITY) && (MS_MIN_GRANULARITY != 1)
uint32 real_sim_idle_ms_sleep (unsigned int msec);
uint32 real_sim_os_msec (void);
uint32 real_sim_os_ms_sleep (unsigned int msec);
static uint32 real_sim_os_sleep_min_ms = 0;
static uint32 real_sim_os_sleep_inc_ms = 0;
uint32 sim_idle_ms_sleep (unsigned int msec)
{
uint32 real_start = real_sim_os_msec ();
uint32 start = (real_start / MS_MIN_GRANULARITY) * MS_MIN_GRANULARITY;
uint32 tick_left;
if (msec == 0)
return 0;
if (real_start == start)
tick_left = 0;
else
tick_left = MS_MIN_GRANULARITY - (real_start - start);
if (msec <= tick_left)
real_sim_idle_ms_sleep (tick_left);
else
real_sim_idle_ms_sleep (((msec + MS_MIN_GRANULARITY - 1) / MS_MIN_GRANULARITY) * MS_MIN_GRANULARITY);
return (sim_os_msec () - start);
}
uint32 sim_os_msec (void)
{
return (real_sim_os_msec ()/MS_MIN_GRANULARITY)*MS_MIN_GRANULARITY;
}
uint32 sim_os_ms_sleep (unsigned int msec)
{
msec = MS_MIN_GRANULARITY*((msec+MS_MIN_GRANULARITY-1)/MS_MIN_GRANULARITY);
return real_sim_os_ms_sleep (msec);
}
#endif /* defined(MS_MIN_GRANULARITY) && (MS_MIN_GRANULARITY != 1) */
t_bool sim_idle_enab = FALSE; /* global flag */
volatile t_bool sim_idle_wait = FALSE; /* global flag */
int32 sim_vm_initial_ips = SIM_INITIAL_IPS;
static int32 sim_precalibrate_ips = SIM_INITIAL_IPS;
static int32 sim_calb_tmr = -1; /* the system calibrated timer */
static int32 sim_calb_tmr_last = -1; /* shadow value when at sim> prompt */
static double sim_inst_per_sec_last = 0; /* shadow value when at sim> prompt */
static uint32 sim_stop_time = 0; /* time when sim_stop_timer_services was called */
double sim_time_at_sim_prompt = 0; /* time spent processing commands from sim> prompt */
static uint32 sim_idle_rate_ms = 0; /* Minimum Sleep time */
static uint32 sim_os_sleep_min_ms = 0;
static uint32 sim_os_sleep_inc_ms = 0;
static uint32 sim_os_clock_resoluton_ms = 0;
static uint32 sim_os_tick_hz = 0;
static uint32 sim_idle_stable = SIM_IDLE_STDFLT;
static uint32 sim_idle_calib_pct = 100;
static double sim_timer_stop_time = 0;
static uint32 sim_rom_delay = 0;
static uint32 sim_throt_ms_start = 0;
static uint32 sim_throt_ms_stop = 0;
static uint32 sim_throt_type = 0;
static uint32 sim_throt_val = 0;
static uint32 sim_throt_drift_pct = SIM_THROT_DRIFT_PCT_DFLT;
static uint32 sim_throt_state = SIM_THROT_STATE_INIT;
static double sim_throt_cps;
static double sim_throt_peak_cps;
static double sim_throt_inst_start;
static uint32 sim_throt_sleep_time = 0;
static int32 sim_throt_wait = 0;
static uint32 sim_throt_delay = 3;
#define CLK_TPS 100
#define CLK_INIT (sim_precalibrate_ips/CLK_TPS)
static int32 sim_int_clk_tps;
typedef struct RTC {
UNIT *clock_unit; /* registered ticking clock unit */
UNIT *timer_unit; /* points to related clock assist unit (sim_timer_units) */
UNIT *clock_cosched_queue;
int32 cosched_interval;
uint32 ticks; /* ticks */
uint32 hz; /* tick rate */
uint32 last_hz; /* prior tick rate */
uint32 rtime; /* real time (usecs) */
uint32 vtime; /* virtual time (usecs) */
double gtime; /* instruction time */
uint32 nxintv; /* next interval */
int32 based; /* base delay */
int32 currd; /* current delay */
int32 initd; /* initial delay */
uint32 elapsed; /* seconds since init */
uint32 calibrations; /* calibration count */
double clock_skew_max; /* asynchronous max skew */
double clock_tick_size; /* 1/hz */
uint32 calib_initializations; /* Initialization Count */
double calib_tick_time; /* ticks time */
double calib_tick_time_tot; /* ticks time - total*/
uint32 calib_ticks_acked; /* ticks Acked */
uint32 calib_ticks_acked_tot; /* ticks Acked - total */
uint32 clock_ticks; /* ticks delivered since catchup base */
uint32 clock_ticks_tot; /* ticks delivered since catchup base - total */
double clock_init_base_time; /* reference time for clock initialization */
double clock_tick_start_time; /* reference time when ticking started */
double clock_catchup_base_time; /* reference time for catchup ticks */
uint32 clock_catchup_ticks; /* Record of catchups */
uint32 clock_catchup_ticks_tot; /* Record of catchups - total */
uint32 clock_catchup_ticks_curr;/* Record of catchups in this second */
t_bool clock_catchup_pending; /* clock tick catchup pending */
t_bool clock_catchup_eligible; /* clock tick catchup eligible */
uint32 clock_time_idled; /* total time idled */
uint32 clock_time_idled_last; /* total time idled as of the previous second */
uint32 clock_calib_skip_idle; /* Calibrations skipped due to idling */
uint32 clock_calib_gap2big; /* Calibrations skipped Gap Too Big */
uint32 clock_calib_backwards; /* Calibrations skipped Clock Running Backwards */
} RTC;
RTC rtcs[SIM_NTIMERS+1];
UNIT sim_timer_units[SIM_NTIMERS+1];/* Clock assist units */
/* one for each timer and one for an internal */
/* clock if no clocks are registered. */
static t_bool sim_catchup_ticks = TRUE;
#if defined (SIM_ASYNCH_CLOCKS) && !defined (SIM_ASYNCH_IO)
#undef SIM_ASYNCH_CLOCKS
#endif
t_bool sim_asynch_timer = FALSE;
#if defined (SIM_ASYNCH_CLOCKS)
UNIT * volatile sim_wallclock_queue = QUEUE_LIST_END;
UNIT * volatile sim_wallclock_entry = NULL;
#endif
#define sleep1Samples 100
static uint32 _compute_minimum_sleep (void)
{
uint32 i, tot, tim;
sim_os_set_thread_priority (PRIORITY_ABOVE_NORMAL);
#if defined(MS_MIN_GRANULARITY) && (MS_MIN_GRANULARITY != 1)
real_sim_idle_ms_sleep (2); /* Start sampling on a tick boundary */
for (i = 0, tot = 0; i < sleep1Samples; i++)
tot += real_sim_idle_ms_sleep (1);
tim = tot / sleep1Samples; /* Truncated average */
real_sim_os_sleep_min_ms = tim;
real_sim_idle_ms_sleep (2); /* Start sampling on a tick boundary */
for (i = 0, tot = 0; i < sleep1Samples; i++)
tot += real_sim_idle_ms_sleep (real_sim_os_sleep_min_ms + 1);
tim = tot / sleep1Samples; /* Truncated average */
real_sim_os_sleep_inc_ms = tim - real_sim_os_sleep_min_ms;
#endif /* defined(MS_MIN_GRANULARITY) && (MS_MIN_GRANULARITY != 1) */
sim_idle_ms_sleep (2); /* Start sampling on a tick boundary */
for (i = 0, tot = 0; i < sleep1Samples; i++)
tot += sim_idle_ms_sleep (1);
tim = tot / sleep1Samples; /* Truncated average */
sim_os_sleep_min_ms = tim;
sim_idle_ms_sleep (2); /* Start sampling on a tick boundary */
for (i = 0, tot = 0; i < sleep1Samples; i++)
tot += sim_idle_ms_sleep (sim_os_sleep_min_ms + 1);
tim = tot / sleep1Samples; /* Truncated average */
sim_os_sleep_inc_ms = tim - sim_os_sleep_min_ms;
sim_os_set_thread_priority (PRIORITY_NORMAL);
return sim_os_sleep_min_ms;
}
#if defined(MS_MIN_GRANULARITY) && (MS_MIN_GRANULARITY != 1)
#define sim_idle_ms_sleep real_sim_idle_ms_sleep
#define sim_os_msec real_sim_os_msec
#define sim_os_ms_sleep real_sim_os_ms_sleep
#endif /* defined(MS_MIN_GRANULARITY) && (MS_MIN_GRANULARITY != 1) */
#if defined(SIM_ASYNCH_IO)
uint32 sim_idle_ms_sleep (unsigned int msec)
{
struct timespec start_time, end_time, done_time, delta_time;
uint32 delta_ms;
t_bool timedout = FALSE;
clock_gettime(CLOCK_REALTIME, &start_time);
end_time = start_time;
end_time.tv_sec += (msec/1000);
end_time.tv_nsec += 1000000*(msec%1000);
if (end_time.tv_nsec >= 1000000000) {
end_time.tv_sec += end_time.tv_nsec/1000000000;
end_time.tv_nsec = end_time.tv_nsec%1000000000;
}
pthread_mutex_lock (&sim_asynch_lock);
sim_idle_wait = TRUE;
if (pthread_cond_timedwait (&sim_asynch_wake, &sim_asynch_lock, &end_time))
timedout = TRUE;
else
sim_asynch_check = 0; /* force check of asynch queue now */
sim_idle_wait = FALSE;
pthread_mutex_unlock (&sim_asynch_lock);
clock_gettime(CLOCK_REALTIME, &done_time);
if (!timedout) {
AIO_UPDATE_QUEUE;
}
sim_timespec_diff (&delta_time, &done_time, &start_time);
delta_ms = (uint32)((delta_time.tv_sec * 1000) + ((delta_time.tv_nsec + 500000) / 1000000));
return delta_ms;
}
#else
uint32 sim_idle_ms_sleep (unsigned int msec)
{
return sim_os_ms_sleep (msec);
}
#endif
/* Mark the need for the sim_os_set_thread_priority routine, */
/* allowing the feature and/or platform dependent code to provide it */
#define NEED_THREAD_PRIORITY
/* If we've got pthreads support then use pthreads mechanisms */
#if defined(USE_READER_THREAD)
#undef NEED_THREAD_PRIORITY
#if defined(_WIN32)
/* On Windows there are several potentially disjoint threading APIs */
/* in use (base win32 pthreads, libSDL provided threading, and direct */
/* calls to beginthreadex), so go directly to the Win32 threading APIs */
/* to manage thread priority */
t_stat sim_os_set_thread_priority (int below_normal_above)
{
const static int val[3] = {THREAD_PRIORITY_BELOW_NORMAL, THREAD_PRIORITY_NORMAL, THREAD_PRIORITY_ABOVE_NORMAL};
if ((below_normal_above < -1) || (below_normal_above > 1))
return SCPE_ARG;
SetThreadPriority (GetCurrentThread(), val[1 + below_normal_above]);
return SCPE_OK;
}
#else
/* Native pthreads priority implementation */
t_stat sim_os_set_thread_priority (int below_normal_above)
{
int sched_policy, min_prio, max_prio;
struct sched_param sched_priority;
if ((below_normal_above < -1) || (below_normal_above > 1))
return SCPE_ARG;
pthread_getschedparam (pthread_self(), &sched_policy, &sched_priority);
min_prio = sched_get_priority_min(sched_policy);
max_prio = sched_get_priority_max(sched_policy);
switch (below_normal_above) {
case PRIORITY_BELOW_NORMAL:
sched_priority.sched_priority = min_prio;
break;
case PRIORITY_NORMAL:
sched_priority.sched_priority = (max_prio + min_prio) / 2;
break;
case PRIORITY_ABOVE_NORMAL:
sched_priority.sched_priority = max_prio;
break;
}
pthread_setschedparam (pthread_self(), sched_policy, &sched_priority);
return SCPE_OK;
}
#endif
#endif /* defined(USE_READER_THREAD) */
/* OS-dependent timer and clock routines */
/* VMS */
#if defined (VMS)
#if defined (__VAX)
#define sys$gettim SYS$GETTIM
#define sys$setimr SYS$SETIMR
#define lib$emul LIB$EMUL
#define sys$waitfr SYS$WAITFR
#define lib$subx LIB$SUBX
#define lib$ediv LIB$EDIV
#endif
#include <starlet.h>
#include <lib$routines.h>
#include <unistd.h>
const t_bool rtc_avail = TRUE;
uint32 sim_os_msec (void)
{
uint32 quo, htod, tod[2];
int32 i;
sys$gettim (tod); /* time 0.1usec */
/* To convert to msec, must divide a 64b quantity by 10000. This is actually done
by dividing the 96b quantity 0'time by 10000, producing 64b of quotient, the
high 32b of which are discarded. This can probably be done by a clever multiply...
*/
quo = htod = 0;
for (i = 0; i < 64; i++) { /* 64b quo */
htod = (htod << 1) | ((tod[1] >> 31) & 1); /* shift divd */
tod[1] = (tod[1] << 1) | ((tod[0] >> 31) & 1);
tod[0] = tod[0] << 1;
quo = quo << 1; /* shift quo */
if (htod >= 10000) { /* divd work? */
htod = htod - 10000; /* subtract */
quo = quo | 1; /* set quo bit */
}
}
return quo;
}
void sim_os_sleep (unsigned int sec)
{
sleep (sec);
}
uint32 sim_os_ms_sleep_init (void)
{
return _compute_minimum_sleep ();
}
uint32 sim_os_ms_sleep (unsigned int msec)
{
uint32 stime = sim_os_msec ();
uint32 qtime[2];
int32 nsfactor = -10000;
static int32 zero = 0;
lib$emul (&msec, &nsfactor, &zero, qtime);
sys$setimr (2, qtime, 0, 0);
sys$waitfr (2);
return sim_os_msec () - stime;
}
#ifdef NEED_CLOCK_GETTIME
int clock_gettime(int clk_id, struct timespec *tp)
{
uint32 secs, ns, tod[2], unixbase[2] = {0xd53e8000, 0x019db1de};
if (clk_id != CLOCK_REALTIME)
return -1;
sys$gettim (tod); /* time 0.1usec */
lib$subx(tod, unixbase, tod); /* convert to unix base */
lib$ediv(&10000000, tod, &secs, &ns); /* isolate seconds & 100ns parts */
tp->tv_sec = secs;
tp->tv_nsec = ns*100;
return 0;
}
#endif /* CLOCK_REALTIME */
#elif defined (_WIN32) || defined(HAVE_WINMM)
/* Win32 routines */
const t_bool rtc_avail = TRUE;
uint32 sim_os_msec (void)
{
return timeGetTime (); /* use Multi-Media time source */
}
void sim_os_sleep (unsigned int sec)
{
Sleep (sec * 1000);
}
static TIMECAPS timers;
void sim_timer_exit (void)
{
timeEndPeriod (timers.wPeriodMin);
}
uint32 sim_os_ms_sleep_init (void)
{
MMRESULT mm_status;
mm_status = timeGetDevCaps (&timers, sizeof (timers));
if (mm_status != TIMERR_NOERROR) {
fprintf (stderr, "timeGetDevCaps() returned: 0x%X, Last Error: 0x%X\n", mm_status, (unsigned int)GetLastError());
return 0;
}
if (timers.wPeriodMin == 0) {
fprintf (stderr, "Unreasonable MultiMedia timer minimum value of 0\n");
return 0;
}
mm_status = timeBeginPeriod (timers.wPeriodMin);
if (mm_status != TIMERR_NOERROR) {
fprintf (stderr, "timeBeginPeriod() returned: 0x%X, Last Error: 0x%X\n", mm_status, (unsigned int)GetLastError());
return 0;
}
atexit (sim_timer_exit);
/* return measured actual minimum sleep time */
return _compute_minimum_sleep ();
}
uint32 sim_os_ms_sleep (unsigned int msec)
{
uint32 stime = sim_os_msec();
Sleep (msec);
return sim_os_msec () - stime;
}
#if defined(NEED_CLOCK_GETTIME)
int clock_gettime(int clk_id, struct timespec *tp)
{
t_uint64 now, unixbase;
if (clk_id != CLOCK_REALTIME)
return -1;
unixbase = 116444736;
unixbase *= 1000000000;
GetSystemTimeAsFileTime((FILETIME*)&now);
now -= unixbase;
tp->tv_sec = (long)(now/10000000);
tp->tv_nsec = (now%10000000)*100;
return 0;
}
#endif
#else
/* UNIX routines */
#include <time.h>
#include <sys/time.h>
#include <unistd.h>
#define NANOS_PER_MILLI 1000000
#define MILLIS_PER_SEC 1000
const t_bool rtc_avail = TRUE;
uint32 sim_os_msec (void)
{
struct timeval cur;
struct timezone foo;
uint32 msec;
gettimeofday (&cur, &foo);
msec = (((uint32) cur.tv_sec) * 1000) + (((uint32) cur.tv_usec) / 1000);
return msec;
}
void sim_os_sleep (unsigned int sec)
{
sleep (sec);
}
uint32 sim_os_ms_sleep_init (void)
{
return _compute_minimum_sleep ();
}
#if !defined(_POSIX_SOURCE)
#ifdef NEED_CLOCK_GETTIME
typedef int clockid_t;
int clock_gettime(clockid_t clk_id, struct timespec *tp)
{
struct timeval cur;
struct timezone foo;
if (clk_id != CLOCK_REALTIME)
return -1;
gettimeofday (&cur, &foo);
tp->tv_sec = cur.tv_sec;
tp->tv_nsec = cur.tv_usec*1000;
return 0;
}
#endif /* CLOCK_REALTIME */
#endif /* !defined(_POSIX_SOURCE) && defined(SIM_ASYNCH_IO) */
uint32 sim_os_ms_sleep (unsigned int milliseconds)
{
uint32 stime = sim_os_msec ();
struct timespec treq;
treq.tv_sec = milliseconds / MILLIS_PER_SEC;
treq.tv_nsec = (milliseconds % MILLIS_PER_SEC) * NANOS_PER_MILLI;
(void) nanosleep (&treq, NULL);
return sim_os_msec () - stime;
}
#if defined(NEED_THREAD_PRIORITY)
#undef NEED_THREAD_PRIORITY
#include <sys/time.h>
#include <sys/resource.h>
t_stat sim_os_set_thread_priority (int below_normal_above)
{
if ((below_normal_above < -1) || (below_normal_above > 1))
return SCPE_ARG;
errno = 0;
switch (below_normal_above) {
case PRIORITY_BELOW_NORMAL:
if ((getpriority (PRIO_PROCESS, 0) <= 0) && /* at or above normal pri? */
(errno == 0))
setpriority (PRIO_PROCESS, 0, 10);
break;
case PRIORITY_NORMAL:
if (getpriority (PRIO_PROCESS, 0) != 0) /* at or above normal pri? */
setpriority (PRIO_PROCESS, 0, 0);
break;
case PRIORITY_ABOVE_NORMAL:
if ((getpriority (PRIO_PROCESS, 0) <= 0) && /* at or above normal pri? */
(errno == 0))
setpriority (PRIO_PROCESS, 0, -10);
break;
}
return SCPE_OK;
}
#endif /* defined(NEED_THREAD_PRIORITY) */
#endif
/* If one hasn't been provided yet, then just stub it */
#if defined(NEED_THREAD_PRIORITY)
t_stat sim_os_set_thread_priority (int below_normal_above)
{
return SCPE_OK;
}
#endif
#if defined(MS_MIN_GRANULARITY) && (MS_MIN_GRANULARITY != 1)
/* Make sure to use the substitute routines */
#undef sim_idle_ms_sleep
#undef sim_os_msec
#undef sim_os_ms_sleep
#endif /* defined(MS_MIN_GRANULARITY) && (MS_MIN_GRANULARITY != 1) */
/* diff = min - sub */
void
sim_timespec_diff (struct timespec *diff, struct timespec *min, struct timespec *sub)
{
/* move the minuend value to the difference and operate there. */
*diff = *min;
/* Borrow as needed for the nsec value */
while (sub->tv_nsec > diff->tv_nsec) {
--diff->tv_sec;
diff->tv_nsec += 1000000000;
}
diff->tv_nsec -= sub->tv_nsec;
diff->tv_sec -= sub->tv_sec;
/* Normalize the result */
while (diff->tv_nsec >= 1000000000) {
++diff->tv_sec;
diff->tv_nsec -= 1000000000;
}
}
/* Forward declarations */
static double _timespec_to_double (struct timespec *time);
static void _double_to_timespec (struct timespec *time, double dtime);
static t_bool _rtcn_tick_catchup_check (RTC *rtc, int32 time);
static void _rtcn_configure_calibrated_clock (int32 newtmr);
static t_bool _sim_coschedule_cancel (UNIT *uptr);
static t_bool _sim_wallclock_cancel (UNIT *uptr);
static t_bool _sim_wallclock_is_active (UNIT *uptr);
static void _sim_timer_adjust_cal(void);
t_stat sim_timer_show_idle_mode (FILE* st, UNIT* uptr, int32 val, CONST void * desc);
#if defined(SIM_ASYNCH_CLOCKS)
static int sim_timespec_compare (struct timespec *a, struct timespec *b)
{
while (a->tv_nsec >= 1000000000) {
a->tv_nsec -= 1000000000;
++a->tv_sec;
}
while (b->tv_nsec >= 1000000000) {
b->tv_nsec -= 1000000000;
++b->tv_sec;
}
if (a->tv_sec < b->tv_sec)
return -1;
if (a->tv_sec > b->tv_sec)
return 1;
if (a->tv_nsec < b->tv_nsec)
return -1;
if (a->tv_nsec > b->tv_nsec)
return 1;
else
return 0;
}
#endif /* defined(SIM_ASYNCH_CLOCKS) */
/* OS independent clock calibration package */
static uint32 sim_idle_cyc_ms = 0; /* Cycles per millisecond while not idling */
static uint32 sim_idle_cyc_sleep = 0; /* Cycles per minimum sleep interval */
static double sim_idle_end_time = 0.0; /* Time when last idle completed */
UNIT sim_stop_unit; /* Stop unit */
UNIT sim_internal_timer_unit; /* Internal calibration timer */
int32 sim_internal_timer_time; /* Pending internal timer delay */
UNIT sim_throttle_unit; /* one for throttle */
t_stat sim_throt_svc (UNIT *uptr);
t_stat sim_timer_tick_svc (UNIT *uptr);
t_stat sim_timer_stop_svc (UNIT *uptr);
#define DBG_IDL TIMER_DBG_IDLE /* idling */
#define DBG_QUE TIMER_DBG_QUEUE /* queue activities */
#define DBG_MUX TIMER_DBG_MUX /* tmxr queue activities */
#define DBG_TRC 0x008 /* tracing */
#define DBG_CAL 0x010 /* calibration activities */
#define DBG_TIM 0x020 /* timer thread activities */
#define DBG_THR 0x040 /* throttle activities */
#define DBG_ACK 0x080 /* interrupt acknowledgement activities */
#define DBG_CHK 0x100 /* check scheduled activation time*/
#define DBG_INT 0x200 /* internal timer activities */
#define DBG_GET 0x400 /* get_time activities */
#define DBG_TIK 0x800 /* tick activities */
DEBTAB sim_timer_debug[] = {
{"TRACE", DBG_TRC, "Trace routine calls"},
{"IDLE", DBG_IDL, "Idling activities"},
{"QUEUE", DBG_QUE, "Event queuing activities"},
{"IACK", DBG_ACK, "interrupt acknowledgement activities"},
{"CALIB", DBG_CAL, "Calibration activities"},
{"TICK", DBG_TIK, "Calibration tick activities"},
{"TIME", DBG_TIM, "Activation and scheduling activities"},
{"GETTIME", DBG_GET, "get_time activities"},
{"INTER", DBG_INT, "Internal timer activities"},
{"THROT", DBG_THR, "Throttling activities"},
{"MUX", DBG_MUX, "Tmxr scheduling activities"},
{"CHECK", DBG_CHK, "Check scheduled activation time"},
{0}
};
/* Forward device declarations */
extern DEVICE sim_timer_dev;
extern DEVICE sim_throttle_dev;
extern DEVICE sim_stop_dev;
void sim_rtcn_init_all (void)
{
int32 tmr;
RTC *rtc;
for (tmr = 0; tmr <= SIM_NTIMERS; tmr++) {
rtc = &rtcs[tmr];
if (rtc->initd != 0)
sim_rtcn_init (rtc->initd, tmr);
}
}
int32 sim_rtcn_init (int32 time, int32 tmr)
{
return sim_rtcn_init_unit (NULL, time, tmr);
}
int32 sim_rtcn_init_unit (UNIT *uptr, int32 time, int32 tmr)
{
return sim_rtcn_init_unit_ticks (uptr, time, tmr, 0);
}
int32 sim_rtcn_init_unit_ticks (UNIT *uptr, int32 time, int32 tmr, int32 ticksper)
{
RTC *rtc;
if (time == 0)
time = 1;
if (tmr == SIM_INTERNAL_CLK)
tmr = SIM_NTIMERS;
else {
if ((tmr < 0) || (tmr >= SIM_NTIMERS))
return time;
}
rtc = &rtcs[tmr];
/*
* If we'd previously succeeded in calibrating a tick value, then use that
* delay as a better default to setup when we're re-initialized.
* Re-initializing happens on any boot.
*/
if (rtc->currd)
time = rtc->currd;
if (!uptr)
uptr = rtc->clock_unit;
sim_debug (DBG_CAL, &sim_timer_dev, "sim_rtcn_init_unit(unit=%s, time=%d, tmr=%d)\n", uptr ? sim_uname(uptr) : "", time, tmr);
if (uptr) {
if (!rtc->clock_unit)
sim_register_clock_unit_tmr (uptr, tmr);
}
rtc->gtime = sim_gtime();
rtc->rtime = sim_is_running ? sim_os_msec () : sim_stop_time;
rtc->vtime = rtc->rtime;
rtc->nxintv = 1000;
rtc->ticks = 0;
rtc->last_hz = rtc->hz;
rtc->hz = ticksper;
rtc->based = time;
rtc->currd = time;
rtc->initd = time;
rtc->elapsed = 0;
rtc->calibrations = 0;
rtc->clock_ticks_tot += rtc->clock_ticks;
rtc->clock_ticks = 0;
rtc->calib_tick_time_tot += rtc->calib_tick_time;
rtc->calib_tick_time = 0;
rtc->clock_catchup_pending = FALSE;
rtc->clock_catchup_eligible = FALSE;
rtc->clock_catchup_ticks_tot += rtc->clock_catchup_ticks;
rtc->clock_catchup_ticks = 0;
rtc->clock_catchup_ticks_curr = 0;
rtc->calib_ticks_acked_tot += rtc->calib_ticks_acked;
rtc->calib_ticks_acked = 0;
++rtc->calib_initializations;
rtc->clock_init_base_time = sim_timenow_double ();
_rtcn_configure_calibrated_clock (tmr);
return time;
}
int32 sim_rtcn_calb_tick (int32 tmr)
{
RTC *rtc = &rtcs[tmr];
return sim_rtcn_calb (rtc->hz, tmr);
}
int32 sim_rtcn_calb (uint32 ticksper, int32 tmr)
{
uint32 new_rtime, delta_rtime, last_idle_pct, catchup_ticks_curr;
int32 delta_vtime;
double new_gtime;
int32 new_currd;
int32 itmr;
RTC *rtc;
if (tmr == SIM_INTERNAL_CLK)
tmr = SIM_NTIMERS;
else {
if ((tmr < 0) || (tmr >= SIM_NTIMERS))
return 10000;
}
rtc = &rtcs[tmr];
if (rtc->hz != ticksper) { /* changing tick rate? */
uint32 prior_hz = rtc->hz;
if (rtc->hz == 0)
rtc->clock_tick_start_time = sim_timenow_double ();
if ((rtc->last_hz != 0) &&
(rtc->last_hz != ticksper) &&
(ticksper != 0))
rtc->currd = (int32)(sim_timer_inst_per_sec () / ticksper);
rtc->last_hz = rtc->hz;
rtc->hz = ticksper;
_rtcn_configure_calibrated_clock (tmr);
if (ticksper != 0) {
RTC *crtc = &rtcs[sim_calb_tmr];
rtc->clock_tick_size = 1.0 / ticksper;
sim_debug (DBG_CAL, &sim_timer_dev, "sim_rtcn_calb(ticksper=%d,tmr=%d) currd=%d, prior_hz=%d\n", ticksper, tmr, rtc->currd, (int)prior_hz);
if ((tmr != sim_calb_tmr) && rtc->clock_unit && (ticksper > crtc->hz)) {
sim_catchup_ticks = TRUE;
sim_debug (DBG_CAL, &sim_timer_dev, "sim_rtcn_calb(%d) - forcing catchup ticks for %s ticking at %d, host tick rate %ds\n", tmr, sim_uname (rtc->clock_unit), ticksper, sim_os_tick_hz);
_rtcn_tick_catchup_check (rtc, 0);
}
}
else
sim_debug (DBG_CAL, &sim_timer_dev, "sim_rtcn_calb(ticksper=%d,tmr=%d) timer stopped currd was %d, prior_hz=%d\n", ticksper, tmr, rtc->currd, (int)prior_hz);
}
if (ticksper == 0) /* running? */
return 10000;
if (rtc->clock_unit == NULL) { /* Not using TIMER units? */
rtc->clock_ticks += 1;
rtc->calib_tick_time += rtc->clock_tick_size;
}
if (rtc->clock_catchup_pending) { /* catchup tick? */
++rtc->clock_catchup_ticks; /* accumulating which were catchups */
++rtc->clock_catchup_ticks_curr;
rtc->clock_catchup_pending = FALSE;
}
rtc->ticks += 1; /* count ticks */
if (rtc->ticks < ticksper) /* 1 sec yet? */
return rtc->currd;
catchup_ticks_curr = rtc->clock_catchup_ticks_curr;
rtc->clock_catchup_ticks_curr = 0;
rtc->ticks = 0; /* reset ticks */
rtc->elapsed += 1; /* count sec */
if (!rtc_avail) /* no timer? */
return rtc->currd;
if (sim_calb_tmr != tmr) {
rtc->currd = (int32)(sim_timer_inst_per_sec()/ticksper);
sim_debug (DBG_CAL, &sim_timer_dev, "sim_rtcn_calb(tmr=%d) calibrated against internal system tmr=%d, tickper=%d (result: %d)\n", tmr, sim_calb_tmr, ticksper, rtc->currd);
return rtc->currd;
}
new_rtime = sim_os_msec (); /* wall time */
if (!sim_signaled_int_char &&
((new_rtime - sim_last_poll_kbd_time) > 500)) {
sim_debug (DBG_CAL, &sim_timer_dev, "sim_rtcn_calb(tmr=%d) gratuitous keyboard poll after %d msecs\n", tmr, (int)(new_rtime - sim_last_poll_kbd_time));
(void)sim_poll_kbd ();
}
++rtc->calibrations; /* count calibrations */
sim_debug (DBG_TRC, &sim_timer_dev, "sim_rtcn_calb(ticksper=%d, tmr=%d)\n", ticksper, tmr);
if (new_rtime < rtc->rtime) { /* time running backwards? */
/* This happens when the value returned by sim_os_msec wraps (as an uint32) */
/* Wrapping will happen initially sometime before a simulator has been running */
/* for 49 days approximately every 49 days thereafter. */
++rtc->clock_calib_backwards; /* Count statistic */
sim_debug (DBG_CAL, &sim_timer_dev, "time running backwards - OldTime: %u, NewTime: %u, result: %d\n", rtc->rtime, new_rtime, rtc->currd);
rtc->vtime = rtc->rtime = new_rtime; /* reset wall time */
rtc->nxintv = 1000;
rtc->based = rtc->currd;
if (rtc->clock_catchup_eligible) {
rtc->clock_catchup_base_time = sim_timenow_double();
rtc->calib_tick_time = 0.0;
}
return rtc->currd; /* can't calibrate */
}
delta_rtime = new_rtime - rtc->rtime; /* elapsed wtime */
rtc->rtime = new_rtime; /* adv wall time */
rtc->vtime += 1000; /* adv sim time */
if (delta_rtime > 30000) { /* gap too big? */
/* This simulator process has somehow been suspended for a significant */
/* amount of time. This will certainly happen if the host system has */
/* slept or hibernated. It also might happen when a simulator */
/* developer stops the simulator at a breakpoint (a process, not simh */
/* breakpoint). To accomodate this, we set the calibration state to */
/* ignore what happened and proceed from here. */
++rtc->clock_calib_gap2big; /* Count statistic */
rtc->vtime = rtc->rtime; /* sync virtual and real time */
rtc->nxintv = 1000; /* reset next interval */
rtc->gtime = sim_gtime(); /* save instruction time */
rtc->based = rtc->currd;
if (rtc->clock_catchup_eligible)
rtc->calib_tick_time += ((double)delta_rtime / 1000.0);/* advance tick time */
sim_debug (DBG_CAL, &sim_timer_dev, "gap too big: delta = %d - result: %d\n", delta_rtime, rtc->currd);
return rtc->currd; /* can't calibr */
}
last_idle_pct = 0; /* normally force calibration */
if (tmr != SIM_NTIMERS) {
if (delta_rtime != 0) /* avoid divide by zero */
last_idle_pct = MIN(100, (uint32)(100.0 * (((double)(rtc->clock_time_idled - rtc->clock_time_idled_last)) / ((double)delta_rtime))));
rtc->clock_time_idled_last = rtc->clock_time_idled;
if (last_idle_pct > sim_idle_calib_pct) {
rtc->rtime = new_rtime; /* save wall time */
rtc->vtime += 1000; /* adv sim time */
rtc->gtime = sim_gtime(); /* save instruction time */
rtc->based = rtc->currd;
++rtc->clock_calib_skip_idle;
sim_debug (DBG_CAL, &sim_timer_dev, "skipping calibration due to idling (%d%%) - result: %d\n", last_idle_pct, rtc->currd);
return rtc->currd; /* avoid calibrating idle checks */
}
}
new_gtime = sim_gtime();
if ((last_idle_pct == 0) && (delta_rtime != 0)) {
sim_idle_cyc_ms = (uint32)((new_gtime - rtc->gtime) / delta_rtime);
if ((sim_idle_rate_ms != 0) && (delta_rtime > 1))
sim_idle_cyc_sleep = (uint32)((new_gtime - rtc->gtime) / (delta_rtime / sim_idle_rate_ms));
}
if (sim_asynch_timer || (catchup_ticks_curr > 0)) {
/* An asynchronous clock or when catchup ticks have */
/* occurred, we merely needs to divide the number of */
/* instructions actually executed by the clock rate. */
new_currd = (int32)((new_gtime - rtc->gtime)/ticksper);
/* avoid excessive swings in the calibrated result */
if (new_currd > 10*rtc->currd) /* don't swing big too fast */
new_currd = 10*rtc->currd;
else {
if (new_currd < rtc->currd/10) /* don't swing small too fast */
new_currd = rtc->currd/10;
}
rtc->based = rtc->currd = new_currd;
rtc->gtime = new_gtime; /* save instruction time */
sim_debug (DBG_CAL, &sim_timer_dev, "sim_rtcn_calb(%s tmr=%d, tickper=%d) catchups=%u, idle=%d%% result: %d\n",
sim_asynch_timer ? "asynch" : "catchup", tmr, ticksper, catchup_ticks_curr, last_idle_pct, rtc->currd);
return rtc->currd; /* calibrated result */
}
rtc->gtime = new_gtime; /* save instruction time */
/* This self regulating algorithm depends directly on the assumption */
/* that this routine is called back after processing the number of */
/* instructions which was returned the last time it was called. */
if (delta_rtime == 0) /* gap too small? */