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/*

 * 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 KERN_PAGE_PT_H_

#define KERN_PAGE_PT_H_

#include <arch/types.h>

#include <mm/as.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

/* Table sizes in each level */

#define PTL0_SIZE           PTL0_SIZE_ARCH

#define PTL1_SIZE           PTL1_SIZE_ARCH

#define PTL2_SIZE           PTL2_SIZE_ARCH

#define PTL3_SIZE           PTL3_SIZE_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 the 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)

/*

 * Macros for querying the last-level PTEs.

 */

#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 as_operations_t as_pt_operations;

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

/** @}

 */