Start of an implementation using doubly-linked lists and virtual

addresses.  This will have to be reworked to use physical addresses thanks
to the PXE spec.

src/include/buffer.h

@@ -0,0 +1,16 @@
+#ifndef BUFFER_H
+#define BUFFER_H
+
+struct buffer_free_block {
+	struct buffer_free_block *next;
+	struct buffer_free_block *prev;	
+	void *end;
+};
+
+struct buffer {
+	struct buffer_free_block free_blocks;
+	void *start;
+	void *end;
+};
+
+#endif /* BUFFER_H */