Merge gblack@m5.eecs.umich.edu:/bk/multiarch

into  ewok.(none):/home/gblack/m5/multiarch

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extra : convert_revision : 8b2759d670a6a60142be748817ccef736d61dabf

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diff --git a/arch/isa_specific.hh b/arch/isa_specific.hh
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+/*
+ * Copyright (c) 2003-2005 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __ARCH_ISA_SPECIFIC_HH__
+#define __ARCH_ISA_SPECIFIC_HH__
+
+//This file provides a mechanism for other source code to bring in
+//files from the ISA being compiled with
+
+//These are constants so you can selective compile code based on the isa
+//To use them, do something like
+//
+//#if THE_ISA == YOUR_FAVORITE_ISA
+//	conditional_code
+//#endif
+//
+//Note that this is how this file sets up the other isa "hooks"
+
+//These macros have numerical values because otherwise the preprocessor
+//would treat them as 0 in comparisons.
+#define ALPHA_ISA 21064
+#define SPARC_ISA 42
+#define MIPS_ISA 1337
+
+//These tell the preprocessor where to find the files of a particular
+//ISA, and set the "TheISA" macro for use elsewhere.
+#if THE_ISA == ALPHA_ISA
+    #define ISA_PATH arch/alpha/
+    #define TheISA AlphaISA
+#elif THE_ISA == SPARC_ISA
+    #define ISA_PATH arch/sparc/
+    #define TheISA SparcISA
+#elif THE_ISA == MIPS_ISA
+    #define ISA_PATH arch/mips/
+    #define TheISA MipsISA
+#else
+    #error "THE_ISA not set"
+#endif
+//The following is some preprocessor voodoo to allow redirectable includes
+//The end result is the ISA_INCLUDE() macro which is used inside stub
+//include files in arch and which redirect to the isa in use.
+#define STRINGIFY(token) #token
+#define EXPAND(token) token
+#define STICK_TOGETHER(firstpart, secondpart) \
+    EXPAND(firstpart)EXPAND(secondpart)
+#define EXPAND_AND_STRINGIFY(pathAndFile) \
+    STRINGIFY(pathAndFile)
+#define ISA_INCLUDE(filename) \
+    EXPAND_AND_STRINGIFY(STICK_TOGETHER(ISA_PATH, filename))
+
+#endif