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TIMER: Provide a means for VM to indicate its expected calibration rate

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As reported and discussed in #817

This allows RUNLIMIT to provide useful results on fast or slow host systems.
This commit is contained in:
Mark Pizzolato
2020-03-23 07:48:45 -07:00
parent 03466a6806
commit 1c589030ae
7 changed files with 14 additions and 5 deletions
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6
sim_timer.c
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@@ -150,6 +150,8 @@ return real_sim_os_ms_sleep (msec);
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 */
@@ -3471,7 +3473,7 @@ sim_idle_stable = 0;
double
sim_host_speed_factor (void)
{
if (sim_precalibrate_ips > SIM_INITIAL_IPS)
if (sim_precalibrate_ips > sim_vm_initial_ips)
return 1.0;
return (double)SIM_INITIAL_IPS / (double)sim_precalibrate_ips;
return (double)sim_vm_initial_ips / (double)sim_precalibrate_ips;
}