Index: kernel/arch/amd64/include/mm/page.h
===================================================================
--- kernel/arch/amd64/include/mm/page.h	(revision ee04c2832455ef7dfdea71dd33d357bf840bc595)
+++ kernel/arch/amd64/include/mm/page.h	(revision aca4a04f4f74053450eb044698771dc0fe13d2ef)
@@ -119,4 +119,14 @@
 	set_pt_flags((pte_t *) (ptl3), (size_t) (i), (x))
 
+/* Set PTE present bit accessors for each level. */
+#define SET_PTL1_PRESENT_ARCH(ptl0, i) \
+	set_pt_present((pte_t *) (ptl0), (size_t) (i))
+#define SET_PTL2_PRESENT_ARCH(ptl1, i) \
+	set_pt_present((pte_t *) (ptl1), (size_t) (i))
+#define SET_PTL3_PRESENT_ARCH(ptl2, i) \
+	set_pt_present((pte_t *) (ptl2), (size_t) (i))
+#define SET_FRAME_PRESENT_ARCH(ptl3, i) \
+	set_pt_present((pte_t *) (ptl3), (size_t) (i))
+
 /* Macros for querying the last-level PTE entries. */
 #define PTE_VALID_ARCH(p) \
@@ -215,4 +225,11 @@
 }
 
+NO_TRACE static inline void set_pt_present(pte_t *pt, size_t i)
+{
+	pte_t *p = &pt[i];
+
+	p->present = 1;
+}
+
 extern void page_arch_init(void);
 extern void page_fault(unsigned int, istate_t *);