Added include folder with hos_types.h and hos_defines.h

Added mm build subdir with mm.c
Updated subdir.mak to build $(subdir)_all.o instead of $(subdir).o
Updated main Makefile to pass SUBDIR in to subdirectory builds, add $(HOS_TOPLEVEL)/include to compiler include path, and made the linker write a map file
Updated boot.asm to use the page_directory symbol from the .bss section defined in mm.o as its temporary stack area

git-svn-id: svn://anubis/hos/trunk@22 5b3e749e-e535-0410-8002-a9bb6afbdfca

kernel/mm/Makefile

@@ -0,0 +1,2 @@
+
+include $(HOS_TOPLEVEL)/subdir.mak

kernel/mm/mm.c

@@ -0,0 +1,4 @@
+
+#include "mm.h"
+
+pagedirectory_t page_directory __attribute__ ((aligned (4096)));

kernel/mm/mm.h

@@ -0,0 +1,16 @@
+
+#ifndef MM_H
+#define MM_H MM_H
+
+#include "hos_types.h"
+#include "hos_defines.h"
+
+typedef u32_t pagedirectory_entry_t;
+
+typedef pagedirectory_entry_t
+    pagedirectory_t[PAGE_SIZE / sizeof(pagedirectory_entry_t)];
+
+extern pagedirectory_t page_directory;
+
+#endif
+