Index: kernel/genarch/include/mm/page_pt.h
===================================================================
--- kernel/genarch/include/mm/page_pt.h	(revision 1167520724b9b526c27b67f2d4bc447ef626240c)
+++ kernel/genarch/include/mm/page_pt.h	(revision 1167520724b9b526c27b67f2d4bc447ef626240c)
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2006 Jakub Jermar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+ /** @addtogroup genarchmm
+ * @{
+ */
+/** @file
+ */
+
+/*
+ * This is the generic 4-level page table interface.
+ * Architectures that use hierarchical page tables
+ * are supposed to implement *_ARCH macros.
+ */
+
+#ifdef CONFIG_PAGE_PT
+
+#ifndef __PAGE_PT_H__
+#define __PAGE_PT_H__
+
+#include <arch/types.h>
+#include <typedefs.h>
+#include <mm/page.h>
+
+/*
+ * Number of entries in each level.
+ */
+#define PTL0_ENTRIES			PTL0_ENTRIES_ARCH
+#define PTL1_ENTRIES			PTL1_ENTRIES_ARCH
+#define PTL2_ENTRIES			PTL2_ENTRIES_ARCH
+#define PTL3_ENTRIES			PTL3_ENTRIES_ARCH
+
+/*
+ * These macros process vaddr and extract those portions
+ * of it that function as indices to respective page tables.
+ */
+#define PTL0_INDEX(vaddr)		PTL0_INDEX_ARCH(vaddr)
+#define PTL1_INDEX(vaddr)		PTL1_INDEX_ARCH(vaddr)
+#define PTL2_INDEX(vaddr)		PTL2_INDEX_ARCH(vaddr)
+#define PTL3_INDEX(vaddr)		PTL3_INDEX_ARCH(vaddr)
+
+#define SET_PTL0_ADDRESS(ptl0)		SET_PTL0_ADDRESS_ARCH(ptl0)
+
+/*
+ * These macros traverse the 4-level tree of page tables,
+ * each descending by one level.
+ */
+#define GET_PTL1_ADDRESS(ptl0, i)	GET_PTL1_ADDRESS_ARCH(ptl0, i)
+#define GET_PTL2_ADDRESS(ptl1, i)	GET_PTL2_ADDRESS_ARCH(ptl1, i)
+#define GET_PTL3_ADDRESS(ptl2, i)	GET_PTL3_ADDRESS_ARCH(ptl2, i)
+#define GET_FRAME_ADDRESS(ptl3, i)	GET_FRAME_ADDRESS_ARCH(ptl3, i)
+
+/*
+ * These macros are provided to change shape of the 4-level
+ * tree of page tables on respective level.
+ */
+#define SET_PTL1_ADDRESS(ptl0, i, a)	SET_PTL1_ADDRESS_ARCH(ptl0, i, a)
+#define SET_PTL2_ADDRESS(ptl1, i, a)	SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
+#define SET_PTL3_ADDRESS(ptl2, i, a)	SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
+#define SET_FRAME_ADDRESS(ptl3, i, a)	SET_FRAME_ADDRESS_ARCH(ptl3, i, a)
+
+/*
+ * These macros are provided to query various flags within the page tables.
+ */
+#define GET_PTL1_FLAGS(ptl0, i)		GET_PTL1_FLAGS_ARCH(ptl0, i)
+#define GET_PTL2_FLAGS(ptl1, i)		GET_PTL2_FLAGS_ARCH(ptl1, i)
+#define GET_PTL3_FLAGS(ptl2, i)		GET_PTL3_FLAGS_ARCH(ptl2, i)
+#define GET_FRAME_FLAGS(ptl3, i)	GET_FRAME_FLAGS_ARCH(ptl3, i)
+
+/*
+ * These macros are provided to set/clear various flags within the page tables.
+ */
+#define SET_PTL1_FLAGS(ptl0, i, x)	SET_PTL1_FLAGS_ARCH(ptl0, i, x)
+#define SET_PTL2_FLAGS(ptl1, i, x)	SET_PTL2_FLAGS_ARCH(ptl1, i, x)
+#define SET_PTL3_FLAGS(ptl2, i, x)	SET_PTL3_FLAGS_ARCH(ptl2, i, x)
+#define SET_FRAME_FLAGS(ptl3, i, x)	SET_FRAME_FLAGS_ARCH(ptl3, i, x)
+
+#define PTE_VALID(p)		PTE_VALID_ARCH((p))
+#define PTE_PRESENT(p)		PTE_PRESENT_ARCH((p))
+#define PTE_GET_FRAME(p)	PTE_GET_FRAME_ARCH((p))
+#define PTE_READABLE(p)		1
+#define PTE_WRITABLE(p)		PTE_WRITABLE_ARCH((p))
+#define PTE_EXECUTABLE(p)	PTE_EXECUTABLE_ARCH((p))
+
+extern page_mapping_operations_t pt_mapping_operations;
+
+extern void page_mapping_insert_pt(as_t *as, uintptr_t page, uintptr_t frame, int flags);
+extern pte_t *page_mapping_find_pt(as_t *as, uintptr_t page);
+
+#endif
+
+#endif
+
+ /** @}
+ */
+