Part of a previous change introduced logice which used the throttling
execution rate calibrated value to determine clock calibration when
throttling is enabled. This provides significantly worse results than the
normal self correcting calibration process. This commit reverses that
part of the previous change.
Simulators which don't have detailed debugging available on their default
device (usually CPU), automatically have the event debugging options
available. Simulators which have CPU device debugging will have to add
the SIM_DBG_EVENT, SIM_DBG_ACTIVATE and SIM_DBG_AIO_QUEUE to
their debug option list to provide this detailed debugging.
Default behavior is to schedule the inter character I/O based on the
TIME (PTP, PTR) and TTIME (TTY) register variables. With default values
here I/O completes very quickly.
A user may influence I/O rate behavior to proceed at a particular character
rate per second by using:
sim> SET CPU CPS=nnn
or equivalently:
sim> SET CPS=nnn
The resulting I/O completion rate will be independent of host system
processor speed and/or any I/O throttling that may be in effect. The
above commands set the deferred I/O character completion rate for
all devices that do deferred I/O (PTP, PTR and TTY).
Each deferred I/O device can have its particular character delivery rates
specified with one of these commands:
sim> deposit PTP CPS xxx
sim> deposit PTR CPS yyy
sim> deposit TTY CPS zzz
A CPS register value of 0 indicates that the default cycle based delays
specified by TIME (PTP & PTR) and TTIME (TTY) registers will control
character completion rates.
- Default CPS is 50
- Add SET {CPU} CPS=nnn and SHOW {CPU} CPS commands.
Individual device specific rates are changeable and visible as CPS register
in each device.
With this update, the erase gap operation has been split out of
"sim_tape_wrgap" into a separate, internal "tape_erase_fwd" routine that
is called from "sim_tape_wrgap" as well as from the new "sim_tape_errecf"
routine. There's a corresponding internal "tape_erase_rev" that's called
from the new "sim_tape_errecr" routine.
I've shimmed "sim_tape_rdlntf" and "sim_tape_rdlntr" to move the tape
context and debug stuff out of the routines that I'm maintaining. This
will allow me to replace those functions in their entirety with the
corresponding functions in my development sources for future updates.
It also allows me to keep Bob's version in sync. As my routines are static
and only called once from the shims, compilers should optimize away
the function calls and instead inline the code, so there'd be no extra call
overhead.
I'd also like to keep "tape_erase_fwd" and "tape_erase_rev" untouched for
the same reason. If you wish to add debug calls to "sim_tape_errecf" and
"sim_tape_errecr", that's fine.
