More progress on build scripts

Created a config directory for configuration files.
Moved all absolute path variables to a projpaths.py file
All scripts can now universally learn absolute paths via projpaths.py
Moved the config_symbols class to the configuration.py file.
Moved libs to loader since they are only referred by the loader

loader/SConscript

@@ -1,136 +0,0 @@
-# -*- mode: python; coding: utf-8; -*-
-
-#  Codezero -- a microkernel for embedded systems.
-#
-#  Copyright © 2009  B Labs Ltd
-#
-#  This program is free software: you can redistribute it and/or modify it under the terms of the GNU
-#  General Public License as published by the Free Software Foundation, either version 3 of the License, or
-#  (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
-#  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
-#  License for more details.
-#
-#  You should have received a copy of the GNU General Public License along with this program.  If not, see
-#  <http://www.gnu.org/licenses/>.
-#
-#  Author: Russel Winder
-
-import os.path
-import subprocess
-
-Import('environment', 'images', 'libsInOrder')
-
-e = environment.Clone()
-e.Append(LINKFLAGS = ['-T' + e['buildDirectory'] + '/loader/linker.lds'])
-e.Append(LIBS = libsInOrder)
-e.Append(CPPPATH = ['#libs/elf/include', '#' + e['buildDirectory'] + '/loader'])
-
-def convertAddress(address):
-    '''Convert the string representation of the address given as parameter to a string representation of the
-    address without the top four bits set.  The issue here is that Python has a penchant for adding L to the
-    end to create a Python literal.  This is not wanted here.'''
-    value = hex(int(address, 16) - 0xf0000000)
-    if value[-1] in ['l', 'L']:
-        value = value[:-1]
-    return value
-
-def ksymToLds(target, source, env):
-    symbols = ['break_virtual']
-    with open(target[0].path, 'w') as asmFile:
-        asmFile.write('''
-/*
- * %s autogenerated from %s.
- *
- * This file is included by the loader sources so that any
- * kernel symbol address can be known in advance and stopped
- * at by debuggers before virtual memory is enabled.
- */
-''' % (target[0].name, source[0].name))
-        for symbol in symbols:
-            process = subprocess.Popen('arm-none-eabi-objdump -d ' + source[0].path + ' | grep "<' + symbol + '>"', shell=True, stdout=subprocess.PIPE)
-            assert process.wait() == 0
-            address, name = process.stdout.read().split()
-            assert '<' + symbol + '>:' == name
-            asmFile.write( '''
-.section .text
-.align 4
-.global %s
-.type %s, function
-.equ %s, %s
-''' % (symbol, symbol, symbol, convertAddress(address)))
-
-
-container_assembler_start = \
-'''
-.align 4
-.section .kernel
-.incbin "%s"
-'''
-
-container_assembler_body = \
-'''
-.align 4
-.section .cont.%d
-.incbin "%s"
-'''
-
-container_lds_start = \
-'''/*
- * Autogenerated linker script that embeds each container image.
- *
- * Copyright (C) 2009 B Labs
- */
-
-SECTIONS
-{'''
-
-container_lds_body = \
-'''
-	.cont.%d : { *(.cont.%d) }'''
-
-container_lds_end = \
-'''
-}
-'''
-
-def generate_container_assembler(source, target, env):
-    with open(target[0].path, "w+") as f:
-        file_body = container_assembler_start % (str(source[0]))
-        img_i = 0
-        for img in source[1:]:
-             file_body += container_assembler_body % (img_i, img)
-             img_i += 1
-
-        f.write(file_body)
-        f.close()
-
-def generate_container_lds(source, target, env):
-     with open(target[0].path, "w+") as f:
-        img_i = 0
-        file_body = container_lds_start
-        for img in source[1:]:
-            file_body += container_lds_body % (img_i, img_i)
-            img_i += 1
-        file_body += container_lds_end
-        f.write(file_body)
-        f.close()
-
-startAxfS = Command('start.axf.S', images[0], ksymToLds)
-
-#  In the following, it is crucially important that the order of the sources is as it is -- assumptions are
-#  made in the functions doing the processing.
-
-kernelS = Command('containers.S', images, generate_container_assembler)
-linkerScript = Command('linker.lds', images, generate_container_lds)
-
-##  TODO:  deal with the situation where there are other .c and .S files in the directory.
-
-objects = e.Object(['arch.c' , 'main.c', kernelS, startAxfS])
-Depends(objects, e['configFiles'])
-Depends(objects, images)
-program = e.Program('final', objects + [e['baremetal_crt0']])
-Depends(program, linkerScript)
-
-Return('program')