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authorJoel Sherrill <joel.sherrill@OARcorp.com>2006-08-23 19:11:14 +0000
committerJoel Sherrill <joel.sherrill@OARcorp.com>2006-08-23 19:11:14 +0000
commit83fb86f32b73942be758c22423c0bfe506fd4ff6 (patch)
treed51a136781eaccf67bfb2addfbe5330d9aed4791 /doc/supplements/powerpc/timePSIM.t
parent2006-08-23 Joel Sherrill <joel@OARcorp.com> (diff)
downloadrtems-83fb86f32b73942be758c22423c0bfe506fd4ff6.tar.bz2
2006-08-23 Joel Sherrill <joel@OARcorp.com>
* Makefile.am, configure.ac, FAQ/stamp-vti, FAQ/version.texi, common/cpright.texi: Merging CPU Supplements into a single document. As part of this removed the obsolete and impossible to maintain size and timing information. * cpu_supplement/.cvsignore, cpu_supplement/Makefile.am, cpu_supplement/arm.t, cpu_supplement/i386.t, cpu_supplement/m68k.t, cpu_supplement/mips.t, cpu_supplement/powerpc.t, cpu_supplement/preface.texi, cpu_supplement/sh.t, cpu_supplement/sparc.t, cpu_supplement/tic4x.t: New files. * supplements/.cvsignore, supplements/Makefile.am, supplements/supplement.am, supplements/arm/.cvsignore, supplements/arm/BSP_TIMES, supplements/arm/ChangeLog, supplements/arm/Makefile.am, supplements/arm/arm.texi, supplements/arm/bsp.t, supplements/arm/callconv.t, supplements/arm/cpumodel.t, supplements/arm/cputable.t, supplements/arm/fatalerr.t, supplements/arm/intr_NOTIMES.t, supplements/arm/memmodel.t, supplements/arm/preface.texi, supplements/arm/timeBSP.t, supplements/c4x/.cvsignore, supplements/c4x/BSP_TIMES, supplements/c4x/ChangeLog, supplements/c4x/Makefile.am, supplements/c4x/bsp.t, supplements/c4x/c4x.texi, supplements/c4x/callconv.t, supplements/c4x/cpumodel.t, supplements/c4x/cputable.t, supplements/c4x/fatalerr.t, supplements/c4x/intr_NOTIMES.t, supplements/c4x/memmodel.t, supplements/c4x/preface.texi, supplements/c4x/timeBSP.t, supplements/i386/.cvsignore, supplements/i386/ChangeLog, supplements/i386/FORCE386_TIMES, supplements/i386/Makefile.am, supplements/i386/bsp.t, supplements/i386/callconv.t, supplements/i386/cpumodel.t, supplements/i386/cputable.t, supplements/i386/fatalerr.t, supplements/i386/i386.texi, supplements/i386/intr_NOTIMES.t, supplements/i386/memmodel.t, supplements/i386/preface.texi, supplements/i386/timeFORCE386.t, supplements/m68k/.cvsignore, supplements/m68k/ChangeLog, supplements/m68k/MVME136_TIMES, supplements/m68k/Makefile.am, supplements/m68k/bsp.t, supplements/m68k/callconv.t, supplements/m68k/cpumodel.t, supplements/m68k/cputable.t, supplements/m68k/fatalerr.t, supplements/m68k/intr_NOTIMES.t, supplements/m68k/m68k.texi, supplements/m68k/memmodel.t, supplements/m68k/preface.texi, supplements/m68k/timeMVME136.t, supplements/m68k/timedata.t, supplements/mips/.cvsignore, supplements/mips/BSP_TIMES, supplements/mips/ChangeLog, supplements/mips/Makefile.am, supplements/mips/bsp.t, supplements/mips/callconv.t, supplements/mips/cpumodel.t, supplements/mips/cputable.t, supplements/mips/fatalerr.t, supplements/mips/intr_NOTIMES.t, supplements/mips/memmodel.t, supplements/mips/mips.texi, supplements/mips/preface.texi, supplements/mips/timeBSP.t, supplements/powerpc/.cvsignore, supplements/powerpc/ChangeLog, supplements/powerpc/DMV177_TIMES, supplements/powerpc/Makefile.am, supplements/powerpc/PSIM_TIMES, supplements/powerpc/bsp.t, supplements/powerpc/callconv.t, supplements/powerpc/cpumodel.t, supplements/powerpc/cputable.t, supplements/powerpc/fatalerr.t, supplements/powerpc/intr_NOTIMES.t, supplements/powerpc/memmodel.t, supplements/powerpc/powerpc.texi, supplements/powerpc/preface.texi, supplements/powerpc/timeDMV177.t, supplements/powerpc/timePSIM.t, supplements/sh/.cvsignore, supplements/sh/BSP_TIMES, supplements/sh/ChangeLog, supplements/sh/Makefile.am, supplements/sh/bsp.t, supplements/sh/callconv.t, supplements/sh/cpumodel.t, supplements/sh/cputable.t, supplements/sh/fatalerr.t, supplements/sh/intr_NOTIMES.t, supplements/sh/memmodel.t, supplements/sh/preface.texi, supplements/sh/sh.texi, supplements/sh/timeBSP.t, supplements/sparc/.cvsignore, supplements/sparc/ChangeLog, supplements/sparc/ERC32_TIMES, supplements/sparc/Makefile.am, supplements/sparc/bsp.t, supplements/sparc/callconv.t, supplements/sparc/cpumodel.t, supplements/sparc/cputable.t, supplements/sparc/fatalerr.t, supplements/sparc/intr_NOTIMES.t, supplements/sparc/memmodel.t, supplements/sparc/preface.texi, supplements/sparc/sparc.texi, supplements/sparc/timeERC32.t, supplements/template/.cvsignore, supplements/template/BSP_TIMES, supplements/template/ChangeLog, supplements/template/Makefile.am, supplements/template/bsp.t, supplements/template/callconv.t, supplements/template/cpumodel.t, supplements/template/cputable.t, supplements/template/fatalerr.t, supplements/template/intr_NOTIMES.t, supplements/template/memmodel.t, supplements/template/preface.texi, supplements/template/template.texi, supplements/template/timeBSP.t: Removed.
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-@c
-@c Timing information for PSIM
-@c
-@c COPYRIGHT (c) 1988-2002.
-@c On-Line Applications Research Corporation (OAR).
-@c All rights reserved.
-@c
-@c $Id$
-@c
-
-@include common/timemac.texi
-@tex
-\global\advance \smallskipamount by -4pt
-@end tex
-
-@chapter RTEMS_BSP Timing Data
-
-@section Introduction
-
-The timing data for RTEMS on the RTEMS_BSP target
-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
-PowerPC version of RTEMS.
-
-@section Hardware Platform
-
-All times reported in this chapter were measured using the PowerPC
-Instruction Simulator (PSIM). PSIM simulates a variety of PowerPC
-6xx models with the PPC603e being used as the basis for the measurements
-reported in this chapter.
-
-The PowerPC decrementer register was was used to gather
-all timing information. In real hardware implementations
-of the PowerPC architecture, this register would typically
-count something like CPU cycles or be a function of the clock
-speed. However, with PSIM each count of the decrementer register
-represents an instruction. Thus all measurements in this
-chapter are reported as the actual number of instructions
-executed. All sources of hardware interrupts were disabled,
-although traps were enabled and the interrupt level of the
-PowerPC allows all interrupts.
-
-@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
-PowerPC 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
-RTEMS_MAXIMUM_DISABLE_PERIOD_MHZ Mhz.
-[NOTE: The maximum period with interrupts disabled was last
-determined for Release RTEMS_RELEASE_FOR_MAXIMUM_DISABLE_PERIOD.]
-
-The maximum period with interrupts disabled within
-RTEMS is hand-timed with some assistance from RTEMS_BSP. The maximum
-period with interrupts disabled with RTEMS occurs was not measured
-on this target.
-
-The interrupt vector and entry overhead time was
-generated on the RTEMS_BSP benchmark platform using the PowerPC's
-decrementer register. This register was programmed to generate
-an interrupt after one countdown.
-
-@section Context Switch
-
-The RTEMS processor context switch time is RTEMS_NO_FP_CONTEXTS
-instructions on the RTEMS_BSP benchmark platform when no floating
-point context is saved or restored. 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. 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.
-
-The following table summarizes the context switch
-times for the RTEMS_BSP benchmark platform: