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authorJoel Sherrill <joel.sherrill@OARcorp.com>2003-09-26 21:44:42 +0000
committerJoel Sherrill <joel.sherrill@OARcorp.com>2003-09-26 21:44:42 +0000
commitf29151e1df6c31a4d7ea92fcfcfe9671a4623d93 (patch)
tree0cbd03b7787062e74b976bfb620a5316c0a7e480 /doc/supplements/hppa1_1/timeSIMHPPA.t
parent5e8552a40721ff6fa37fb9e6f7e4df0aec644022 (diff)
downloadrtems-f29151e1df6c31a4d7ea92fcfcfe9671a4623d93.tar.bz2
2003-09-26 Joel Sherrill <joel@OARcorp.com>
* hppa1_1/.cvsignore, hppa1_1/ChangeLog, hppa1_1/Makefile.am, hppa1_1/SIMHPPA_TIMES, hppa1_1/bsp.t, hppa1_1/callconv.t, hppa1_1/cpumodel.t, hppa1_1/cputable.t, hppa1_1/fatalerr.t, hppa1_1/hppa1_1.texi, hppa1_1/intr_NOTIMES.t, hppa1_1/memmodel.t, hppa1_1/preface.texi, hppa1_1/timeSIMHPPA.t: Removed.
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-@c
-@c COPYRIGHT (c) 1988-2002.
-@c On-Line Applications Research Corporation (OAR).
-@c All rights reserved.
-@c
-@c $Id$
-@c
-
-@chapter HP-7100 Timing Data
-
-@section Introduction
-
-The timing data for the PA-RISC version of RTEMS is
-provided along with the target dependent aspects concerning the
-gathering of the timing data. The hardware platform used to
-gather the times is described to give the reader a better
-understanding of each directive time provided. Also, provided
-is a description of the interrupt latency and the context
-switch times as they pertain to the PA-RISC version of RTEMS.
-
-@section Hardware Platform
-
-No directive execution times are reported for the
-HP-7100 because the target platform was proprietary and
-executions times could not be released.
-
-@section Interrupt Latency
-
-The maximum period with traps disabled or the
-processor interrupt level set to it's highest value inside RTEMS
-is less than RTEMS_MAXIMUM_DISABLE_PERIOD
-microseconds including the instructions which
-disable and re-enable interrupts. The time required for the
-HP-7100 to vector an interrupt and for the RTEMS entry overhead
-before invoking the user's trap handler are a total of
-RTEMS_INTR_ENTRY_RETURNS_TO_PREEMPTING_TASK
-microseconds. These combine to yield a worst case interrupt
-latency of less than RTEMS_MAXIMUM_DISABLE_PERIOD +
-RTEMS_INTR_ENTRY_RETURNS_TO_PREEMPTING_TASK microseconds at 15 Mhz.
-[NOTE: The maximum period with interrupts disabled was last
-determined for Release RTEMS_RELEASE_FOR_MAXIMUM_DISABLE_PERIOD.]
-
-It should be noted again that the maximum period with
-interrupts disabled within RTEMS for the HP-7100 is hand calculated.
-
-@section Context Switch
-
-The RTEMS processor context switch time is RTEMS_NO_FP_CONTEXTS
-microsections for the HP-7100 when no floating point context
-switch is saved or restored. Saving and restoring the floating
-point context adds additional time to the context
-switch procedure. Additional execution time is required when a
-TASK_SWITCH user extension is configured. The use of the
-TASK_SWITCH extension is application dependent. Thus, its
-execution time is not considered part of the raw context switch
-time.
-
-Since RTEMS was designed specifically for embedded
-missile applications which are floating point intensive, the
-executive is optimized to avoid unnecessarily saving and
-restoring the state of the numeric coprocessor. On many
-processors, the state of the numeric coprocessor is only saved
-when an FLOATING_POINT task is dispatched and that task was not
-the last task to utilize the coprocessor. In a system with only
-one FLOATING_POINT task, the state of the numeric coprocessor
-will never be saved or restored. When the first FLOATING_POINT
-task is dispatched, RTEMS does not need to save the current
-state of the numeric coprocessor. As discussed in the Register
-Usage section, on the HP-7100 the every task is considered to be
-floating point registers and , as a rsule, every context switch
-involves saving and restoring the state of the floating point
-unit.
-
-The following table summarizes the context switch
-times for the HP-7100 processor:
-
-@example
-no times are available for the HP-7100
-@end example
-
-@section Directive Times
-
-No execution times are available for the HP-7100
-because the target platform was proprietary and no timing
-information could be released.
-