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authorJoel Sherrill <joel.sherrill@OARcorp.com>2004-09-29 17:30:27 +0000
committerJoel Sherrill <joel.sherrill@OARcorp.com>2004-09-29 17:30:27 +0000
commita93c17494c915e755417ca2fcc02fb928144aec0 (patch)
tree61371a3e82e3adde2e20a490a03664de1821db78 /doc/supplements/i960/cpumodel.t
parent2004-09-29 Joel Sherrill <joel@OARcorp.com> (diff)
downloadrtems-a93c17494c915e755417ca2fcc02fb928144aec0.tar.bz2
2004-09-29 Joel Sherrill <joel@OARcorp.com>
* supplements/Makefile.am: i960 obsoleted. * supplements/i960/.cvsignore, supplements/i960/CVME961_TIMES, supplements/i960/ChangeLog, supplements/i960/Makefile.am, supplements/i960/bsp.t, supplements/i960/callconv.t, supplements/i960/cpumodel.t, supplements/i960/cputable.t, supplements/i960/fatalerr.t, supplements/i960/i960.texi, supplements/i960/intr_NOTIMES.t, supplements/i960/memmodel.t, supplements/i960/preface.texi, supplements/i960/timeCVME961.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 CPU Model Dependent Features
-
-@section Introduction
-
-Microprocessors are generally classified into
-families with a variety of CPU models or implementations within
-that family. Within a processor family, there is a high level
-of binary compatibility. This family may be based on either an
-architectural specification or on maintaining compatibility with
-a popular processor. Recent microprocessor families such as the
-SPARC or PowerPC are based on an architectural specification
-which is independent or any particular CPU model or
-implementation. Older families such as the M68xxx and the iX86
-evolved as the manufacturer strived to produce higher
-performance processor models which maintained binary
-compatibility with older models.
-
-RTEMS takes advantage of the similarity of the
-various models within a CPU family. Although the models do vary
-in significant ways, the high level of compatibility makes it
-possible to share the bulk of the CPU dependent executive code
-across the entire family. Each processor family supported by
-RTEMS has a list of features which vary between CPU models
-within a family. For example, the most common model dependent
-feature regardless of CPU family is the presence or absence of a
-floating point unit or coprocessor. When defining the list of
-features present on a particular CPU model, one simply notes
-that floating point hardware is or is not present and defines a
-single constant appropriately. Conditional compilation is
-utilized to include the appropriate source code for this CPU
-model's feature set. It is important to note that this means
-that RTEMS is thus compiled using the appropriate feature set
-and compilation flags optimal for this CPU model used. The
-alternative would be to generate a binary which would execute on
-all family members using only the features which were always
-present.
-
-This chapter presents the set of features which vary
-across i960 implementations and are of importance to RTEMS.
-The set of CPU model feature macros are defined in the file
-cpukit/score/cpu/i960/i960.h based upon the particular CPU
-model defined on the compilation command line.
-
-@section CPU Model Name
-
-The macro CPU_MODEL_NAME is a string which designates
-the name of this CPU model. For example, for the Intel i960CA,
-this macro is set to the string "i960ca".
-
-@section Floating Point Unit
-
-The macro I960_HAS_FPU is set to 1 to indicate that
-this CPU model has a hardware floating point unit and 0
-otherwise.