Add in a new translating port that allows syscalls to translate addresses via the page table before accessing the memory port.

Other compile issues cleaned up.

SConscript:
    Changes to compile the new Translating Port.
    Split out memtester and eio support, will rework them back in after first getting a simpleCPU to work
arch/alpha/alpha_linux_process.cc:
arch/alpha/alpha_tru64_process.cc:
sim/syscall_emul.cc:
sim/syscall_emul.hh:
    Changes to use the new translating Port.
cpu/exec_context.cc:
cpu/exec_context.hh:
    Create a translating port in each execution context.
sim/process.cc:
    Fix the way we do proxy memory

--HG--
extra : convert_revision : 3d33218fe8b425a5d9ce24757f1112b4aa6001fd

SConscript

@@ -93,7 +93,7 @@ base_sources = Split('''
         mem/memory.cc
         mem/page_table.cc
         mem/physical.cc
-        mem/proxy.cc
+        mem/translating_port.cc
 
         python/pyconfig.cc
         python/embedded_py.cc
@@ -294,14 +294,21 @@ syscall_emulation_sources = Split('''
 	arch/alpha/alpha_common_syscall_emul.cc
 	arch/alpha/alpha_linux_process.cc
 	arch/alpha/alpha_tru64_process.cc
-	cpu/memtest/memtest.cc
-	encumbered/eio/eio.cc
+
 	encumbered/eio/exolex.cc
 	encumbered/eio/libexo.cc
 	sim/process.cc
 	sim/syscall_emul.cc
         ''')
 
+eio_sources = Split('''
+	encumbered/eio/eio.cc
+        ''')
+
+memtest_sources = Split('''
+	cpu/memtest/memtest.cc
+        ''')
+
 targetarch_files = Split('''
         alpha_common_syscall_emul.hh
         alpha_linux_process.hh