forked from Imagelibrary/rtems
2002-07-30 Joel Sherrill <joel@OARcorp.com>
* .cvsignore: Corrected some errors. * intr_NOTIMES.t, timeBSP.t: Replaced XXX's with real info.
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@@ -5,29 +5,29 @@ callconv.texi
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cpumodel.texi
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cputable.texi
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fatalerr.texi
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i386
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i386*.html
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i386-?
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i386-??
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i386.aux
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i386.cp
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i386.dvi
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i386.fn
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i386.ky
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i386.log
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i386.pdf
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i386.pg
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i386.ps
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i386.toc
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i386.tp
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i386.vr
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mips
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mips*.html
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mips-?
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mips-??
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mips.aux
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mips.cp
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mips.dvi
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mips.fn
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mips.ky
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mips.log
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mips.pdf
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mips.pg
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mips.ps
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mips.toc
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mips.tp
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mips.vr
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index.html
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intr.t
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intr.texi
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mdate-sh
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memmodel.texi
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timeFORCE386.texi
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timeFORCE386_.t
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timeBSP_.t
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timeBSP.texi
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timing.t
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timing.texi
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wksheets.t
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@@ -1,3 +1,8 @@
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2002-07-30 Joel Sherrill <joel@OARcorp.com>
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* .cvsignore: Corrected some errors.
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* intr_NOTIMES.t, timeBSP.t: Replaced XXX's with real info.
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2002-03-27 Ralf Corsepius <corsepiu@faw.uni-ulm.de>
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* Makefile.am: Remove AUTOMAKE_OPTIONS.
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@@ -167,7 +167,7 @@ the execution of this section and restores them to the previous
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level upon completion of the section. RTEMS has been optimized
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to insure that interrupts are disabled for less than
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RTEMS_MAXIMUM_DISABLE_PERIOD microseconds on a
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RTEMS_MAXIMUM_DISABLE_PERIOD_MHZ Mhz XXX with
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RTEMS_MAXIMUM_DISABLE_PERIOD_MHZ Mhz processor with
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zero wait states. These numbers will vary based the
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number of wait states and processor speed present on the target board.
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[NOTE: The maximum period with interrupts disabled is hand calculated. This
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@@ -189,7 +189,7 @@ interrupt stack is determined by the interrupt_stack_size field
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in the CPU Configuration Table. During the initialization
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process, RTEMS will install its interrupt stack.
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The XXX port of RTEMS supports a software managed
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The mips port of RTEMS supports a software managed
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dedicated interrupt stack on those CPU models which do not
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support a separate interrupt stack in hardware.
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@@ -15,19 +15,20 @@
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@section Introduction
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The timing data for the XXX version of RTEMS is
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The timing data for the MIPS version of RTEMS is
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provided along with the target dependent aspects concerning the
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gathering of the timing data. The hardware platform used to
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gather the times is described to give the reader a better
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understanding of each directive time provided. Also, provided
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is a description of the interrupt latency and the context switch
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times as they pertain to the XXX version of RTEMS.
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times as they pertain to the MIPS version of RTEMS.
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@section Hardware Platform
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All times reported except for the maximum period
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interrupts are disabled by RTEMS were measured using a Motorola
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BSP_FOR_TIMES CPU board. The BSP_FOR_TIMES is a 20Mhz board with one wait
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BSP_FOR_TIMES CPU board. The BSP_FOR_TIMES is a RTEMS_MAXIMUM_DISABLE_PERIOD_MHZ
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Mhz board with one wait
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state dynamic memory and a XXX numeric coprocessor. The
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Zilog 8036 countdown timer on this board was used to measure
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elapsed time with a one-half microsecond resolution. All
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@@ -41,7 +42,8 @@ disabled. The worst case times of the XXX microprocessor
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were used for each instruction. Zero wait state memory was
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assumed. The total CPU cycles executed with interrupts
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disabled, including the instructions to disable and enable
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interrupts, was divided by 20 to simulate a 20Mhz XXX. It
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interrupts, was divided by 20 to simulate a RTEMS_MAXIMUM_DISABLE_PERIOD_MHZ
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Mhz processor. It
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should be noted that the worst case instruction times for the
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XXX assume that the internal cache is disabled and that no
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instructions overlap.
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@@ -58,14 +60,16 @@ total of RTEMS_INTR_ENTRY_RETURNS_TO_PREEMPTING_TASK
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microseconds. These combine to yield a worst case
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interrupt latency of less than
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RTEMS_MAXIMUM_DISABLE_PERIOD + RTEMS_INTR_ENTRY_RETURNS_TO_PREEMPTING_TASK
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microseconds at 20Mhz. [NOTE: The maximum period with interrupts
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microseconds at RTEMS_MAXIMUM_DISABLE_PERIOD_MHZ
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Mhz. [NOTE: The maximum period with interrupts
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disabled was last determined for Release
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RTEMS_RELEASE_FOR_MAXIMUM_DISABLE_PERIOD.]
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It should be noted again that the maximum period with
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interrupts disabled within RTEMS is hand-timed and based upon
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worst case (i.e. CPU cache disabled and no instruction overlap)
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times for a 20Mhz XXX. The interrupt vector and entry
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times for a RTEMS_MAXIMUM_DISABLE_PERIOD_MHZ
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Mhz processor. The interrupt vector and entry
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overhead time was generated on an BSP_FOR_TIMES benchmark platform
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using the Multiprocessing Communications registers to generate
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as the interrupt source.
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@@ -93,8 +97,8 @@ is dispatched, RTEMS does not need to save the current state of
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the numeric coprocessor.
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The exact amount of time required to save and restore
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floating point context is dependent on whether an XXX or
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XXX is being used as well as the state of the numeric
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floating point context is dependent which FPU is being
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used as well as the state of the numeric
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coprocessor. These numeric coprocessors define three operating
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states: initialized, idle, and busy. RTEMS places the
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coprocessor in the initialized state when a task is started or
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