diff --git a/kernel/Makefile b/kernel/Makefile
index d43a46f..d3e2d21 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -20,12 +20,12 @@ WD              := $(shell pwd)
 export HOS_TOPLEVEL := $(WD)
 LDSCRIPT        := link.ld
 KERNEL          := hos
-export CPPFLAGS := -I$(WD)/include
+export CPPFLAGS := -I$(HOS_TOPLEVEL) -I$(HOS_TOPLEVEL)/include
 export CFLAGS   := -Wall -O2
 export CXXFLAGS := -Wall -O2
-export LDFLAGS  := -T $(LDSCRIPT)
+export LDFLAGS  := -T $(LDSCRIPT) -Map $(KERNEL).map
 
-SUBDIRS         := boot
+SUBDIRS         := boot mm
 SUBDIRS_clean   := $(SUBDIRS:%=%.clean)
 
 .PHONY: all
@@ -35,11 +35,11 @@ $(KERNEL).gz: $(KERNEL)
 	gzip -c $< > $@
 
 $(KERNEL): $(SUBDIRS)
-	$(LD) $(LDFLAGS) -o $@ $(foreach subdir,$(SUBDIRS),$(subdir)/$(subdir).o)
+	$(LD) $(LDFLAGS) -o $@ $(foreach subdir,$(SUBDIRS),$(subdir)/$(subdir)_all.o)
 
 .PHONY: $(SUBDIRS)
 $(SUBDIRS):
-	$(MAKE) -C $@
+	$(MAKE) -C $@ SUBDIR=$@
 
 .PHONY: clean
 clean: $(SUBDIRS_clean)
diff --git a/kernel/boot/boot.asm b/kernel/boot/boot.asm
index 9f70e37..bb889c4 100644
--- a/kernel/boot/boot.asm
+++ b/kernel/boot/boot.asm
@@ -9,16 +9,13 @@
 
 %define VIRTUAL_OFFSET              0xE0000000          ; kernel virtual addr
 
-%define TEMPORARY_STACK_PHYSICAL    0x01000000-4        ; top of first 16MB
-%define TEMPORARY_STACK_VIRTUAL     TEMPORARY_STACK_PHYSICAL + VIRTUAL_OFFSET
-
 %define PAGE_SIZE                   0x1000              ; 4KB pages
 
 ; Symbols from the linker
 extern _end, _bss
 
 ; Symbols from C
-extern k_mbsave
+extern k_mbsave, page_directory
 
 ;-------------------------------------------------------
 [section .text]
@@ -66,7 +63,7 @@ segmented_start:
     mov     es, cx
     mov     gs, cx
     mov     fs, cx
-    mov     esp, TEMPORARY_STACK_VIRTUAL-4  ; set up temporary stack space
+    mov     esp, page_directory+PAGE_SIZE-4 ; set up temporary stack space
 
     mov     ax, 0x0700 + 'b'
     mov     [VIRTUAL_OFFSET+0xB8000+160*8+1*2], ax
diff --git a/kernel/include/hos_defines.h b/kernel/include/hos_defines.h
new file mode 100644
index 0000000..01db016
--- /dev/null
+++ b/kernel/include/hos_defines.h
@@ -0,0 +1,7 @@
+
+#ifndef HOS_DEFINES_H
+#define HOS_DEFINES_H
+
+#define PAGE_SIZE 4096
+
+#endif
diff --git a/kernel/include/hos_types.h b/kernel/include/hos_types.h
new file mode 100644
index 0000000..eead480
--- /dev/null
+++ b/kernel/include/hos_types.h
@@ -0,0 +1,14 @@
+
+#ifndef HOS_TYPES_H
+#define HOS_TYPES_H
+
+typedef unsigned char       u8_t;
+typedef signed char         s8_t;
+typedef unsigned short      u16_t;
+typedef signed short        s16_t;
+typedef unsigned int        u32_t;
+typedef signed int          s32_t;
+typedef unsigned long long  u64_t;
+typedef signed long long    s64_t;
+
+#endif
diff --git a/kernel/mm/Makefile b/kernel/mm/Makefile
new file mode 100644
index 0000000..cae81d7
--- /dev/null
+++ b/kernel/mm/Makefile
@@ -0,0 +1,2 @@
+
+include $(HOS_TOPLEVEL)/subdir.mak
diff --git a/kernel/mm/mm.c b/kernel/mm/mm.c
new file mode 100644
index 0000000..30000c5
--- /dev/null
+++ b/kernel/mm/mm.c
@@ -0,0 +1,4 @@
+
+#include "mm.h"
+
+pagedirectory_t page_directory __attribute__ ((aligned (4096)));
diff --git a/kernel/mm/mm.h b/kernel/mm/mm.h
new file mode 100644
index 0000000..43420ba
--- /dev/null
+++ b/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
+
diff --git a/kernel/subdir.mak b/kernel/subdir.mak
index f396122..dcded74 100644
--- a/kernel/subdir.mak
+++ b/kernel/subdir.mak
@@ -4,10 +4,11 @@ COBJS           := $(patsubst %.c,%.o,$(wildcard *.c))
 CXXOBJS         := $(patsubst %.cc,%.o,$(wildcard *.cc))
 CDEPS           := $(COBJS:.o=.dep)
 CXXDEPS         := $(CXXOBJS:.o=.dep)
+OUTPUT_FILE     := $(SUBDIR)_all.o
 
-all: $(SUBDIR).o
+all: $(OUTPUT_FILE)
 
-$(SUBDIR).o: $(ASMOBJS) $(COBJS) $(CXXOBJS)
+$(OUTPUT_FILE): $(ASMOBJS) $(COBJS) $(CXXOBJS)
 	$(LD) -r -o $@ $^
 
 %.o: %.asm