Add MemoryManager class

This will be the top-level class for the memory manager subsystem.
Copy in some code from kmain()

src/Memory.cc

@@ -0,0 +1,37 @@
+/* Memory.cc
+ * vim: set tw=80:
+ * Eryn Wells <eryn@erynwells.me>
+ */
+/**
+ * Top-level classes for managing system memory.
+ */
+
+#include "Memory.hh"
+
+namespace kernel {
+
+/*
+ * Public
+ */
+
+void
+MemoryManager::initialize(Console& console)
+{
+    initializeGDT();
+    console.printString("GDT loaded\n");
+}
+
+/*
+ * Private
+ */
+
+void
+MemoryManager::initializeGDT()
+{
+    mGDT.setNullDescriptor(0);
+    mGDT.setDescriptor(1, x86::GDT::DescriptorSpec::kernelSegment(0, 0xFFFFFFFF, x86::GDT::Type::CodeEXR));
+    mGDT.setDescriptor(2, x86::GDT::DescriptorSpec::kernelSegment(0, 0xFFFFFFFF, x86::GDT::Type::DataRW));
+    mGDT.load();
+}
+    
+} /* namespace kernel */

src/Memory.hh

@@ -0,0 +1,30 @@
+/* Memory.hh
+ * vim: set tw=80:
+ * Eryn Wells <eryn@erynwells.me>
+ */
+/**
+ * Declaration of top-level classes for managing system memory.
+ */
+
+#ifndef __MEMORY_HH__
+#define __MEMORY_HH__
+
+#include "Console.hh"
+#include "Descriptors.hh"
+
+
+namespace kernel {
+
+struct MemoryManager
+{
+    void initialize(Console& console);
+
+private:
+    x86::GDT mGDT;
+
+    void initializeGDT();
+};
+    
+} /* namespace kernel */
+
+#endif /* __MEMORY_HH__ */

src/SConscript

@@ -15,6 +15,7 @@ files = [
     'Descriptors.cc',
     'Interrupts.cc',
     'Kernel.cc',
+    'Memory.cc',
     'Multiboot.cc',
     'PIC.cc',
     'cxa.cc',