Made kern a switching header file directory.

SConstruct:
    Put the code to make a switching header directory into a function so they are easy to make.
src/arch/SConscript:
    Replace switching header code with the new function call.
src/kern/SConscript:
    Created a new switching header directory in kern, and moved the declaration of some source files here.

--HG--
rename : src/kern/kernel_stats.cc => src/kern/base_kernel_stats.cc
rename : src/kern/kernel_stats.hh => src/kern/base_kernel_stats.hh
extra : convert_revision : 98f5320a5ade567c3e4f67fef123dfb0c5122545

5 files changed, 112 insertions, 30 deletions

diff --git a/SConstruct b/SConstruct
index 59d40d5cc..d047f99d3 100644
--- a/SConstruct
+++ b/SConstruct
@@ -461,6 +461,46 @@ env.SConscript('ext/libelf/SConscript',
 
 ###################################################
 #
+# This function is used to set up a directory with switching headers
+#
+###################################################
+
+def make_switching_dir(dirname, switch_headers, env):
+    # Generate the header.  target[0] is the full path of the output
+    # header to generate.  'source' is a dummy variable, since we get the
+    # list of ISAs from env['ALL_ISA_LIST'].
+    def gen_switch_hdr(target, source, env):
+	fname = str(target[0])
+	basename = os.path.basename(fname)
+	f = open(fname, 'w')
+	f.write('#include "arch/isa_specific.hh"\n')
+	cond = '#if'
+	for isa in env['ALL_ISA_LIST']:
+	    f.write('%s THE_ISA == %s_ISA\n#include "%s/%s/%s"\n'
+		    % (cond, isa.upper(), dirname, isa, basename))
+	    cond = '#elif'
+	f.write('#else\n#error "THE_ISA not set"\n#endif\n')
+	f.close()
+	return 0
+
+    # String to print when generating header
+    def gen_switch_hdr_string(target, source, env):
+	return "Generating switch header " + str(target[0])
+
+    # Build SCons Action object. 'varlist' specifies env vars that this
+    # action depends on; when env['ALL_ISA_LIST'] changes these actions
+    # should get re-executed.
+    switch_hdr_action = Action(gen_switch_hdr, gen_switch_hdr_string,
+                               varlist=['ALL_ISA_LIST'])
+
+    # Instantiate actions for each header
+    for hdr in switch_headers:
+        env.Command(hdr, [], switch_hdr_action)
+
+env.make_switching_dir = make_switching_dir
+
+###################################################
+#
 # Define build environments for selected configurations.
 #
 ###################################################
@@ -566,6 +606,7 @@ for build_path in build_paths:
 
 Help(help_text)
 
+
 ###################################################
 #
 # Let SCons do its thing.  At this point SCons will use the defined
diff --git a/src/arch/SConscript b/src/arch/SConscript
index 2ef3d5ee0..82a56d4eb 100644
--- a/src/arch/SConscript
+++ b/src/arch/SConscript
@@ -63,36 +63,8 @@ isa_switch_hdrs = Split('''
 	vtophys.hh
         ''')
 
-# Generate the header.  target[0] is the full path of the output
-# header to generate.  'source' is a dummy variable, since we get the
-# list of ISAs from env['ALL_ISA_LIST'].
-def gen_switch_hdr(target, source, env):
-    fname = str(target[0])
-    basename = os.path.basename(fname)
-    f = open(fname, 'w')
-    f.write('#include "arch/isa_specific.hh"\n')
-    cond = '#if'
-    for isa in env['ALL_ISA_LIST']:
-        f.write('%s THE_ISA == %s_ISA\n#include "arch/%s/%s"\n'
-                % (cond, isa.upper(), isa, basename))
-        cond = '#elif'
-    f.write('#else\n#error "THE_ISA not set"\n#endif\n')
-    f.close()
-    return 0
-
-# String to print when generating header
-def gen_switch_hdr_string(target, source, env):
-    return "Generating ISA switch header " + str(target[0])
-
-# Build SCons Action object. 'varlist' specifies env vars that this
-# action depends on; when env['ALL_ISA_LIST'] changes these actions
-# should get re-executed.
-switch_hdr_action = Action(gen_switch_hdr, gen_switch_hdr_string,
-                           varlist=['ALL_ISA_LIST'])
-
-# Instantiate actions for each header
-for hdr in isa_switch_hdrs:
-    env.Command(hdr, [], switch_hdr_action)
+# Set up this directory to support switching headers
+env.make_switching_dir('arch', isa_switch_hdrs, env)
 
 #################################################################
 #
diff --git a/src/kern/SConscript b/src/kern/SConscript
new file mode 100644
index 000000000..7245e2889
--- /dev/null
+++ b/src/kern/SConscript
@@ -0,0 +1,69 @@
+# -*- mode:python -*-
+
+# Copyright (c) 2006 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.
+#
+# Authors: Steve Reinhardt
+
+import os.path, sys
+
+# Import build environment variable from SConstruct.
+Import('env')
+
+sources = Split('''
+	base_kernel_stats.cc
+	system_events.cc
+	linux/events.cc
+	linux/linux_syscalls.cc
+	linux/printk.cc
+	''')
+
+# Convert file names to SCons File objects.  This takes care of the
+# path relative to the top of the directory tree.
+sources = [File(s) for s in sources]
+
+#################################################################
+#
+# ISA "switch header" generation.
+#
+# Auto-generate arch headers that include the right ISA-specific
+# header based on the setting of THE_ISA preprocessor variable.
+#
+#################################################################
+
+# List of headers to generate
+kern_switch_hdrs = Split('''
+        kernel_stats.hh
+        ''')
+
+env.make_switching_dir('kern', kern_switch_hdrs, env)
+
+isa = env['TARGET_ISA'] # someday this may be a list of ISAs
+
+# Let the target architecture define what additional sources it needs
+sources += SConscript(os.path.join(isa, 'SConscript'), exports = 'env')
+
+Return('sources')
diff --git a/src/kern/kernel_stats.cc b/src/kern/base_kernel_stats.cc
index f049ed66c..f049ed66c 100644
--- a/src/kern/kernel_stats.cc
+++ b/src/kern/base_kernel_stats.cc
diff --git a/src/kern/kernel_stats.hh b/src/kern/base_kernel_stats.hh
index bd4850b0a..bd4850b0a 100644
--- a/src/kern/kernel_stats.hh
+++ b/src/kern/base_kernel_stats.hh