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1 jermar 1 
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#ifndef __PAGE_H__
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#define __PAGE_H__
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#include <arch/types.h>
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#include <typedefs.h>
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#define PAGE_CACHEABLE_SHIFT        0
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#define PAGE_NOT_CACHEABLE_SHIFT    PAGE_CACHEABLE_SHIFT
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#define PAGE_PRESENT_SHIFT      1
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#define PAGE_NOT_PRESENT_SHIFT      PAGE_PRESENT_SHIFT
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#define PAGE_USER_SHIFT         2
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#define PAGE_KERNEL_SHIFT       PAGE_USER_SHIFT
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#define PAGE_READ_SHIFT         3
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#define PAGE_WRITE_SHIFT        4
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#define PAGE_EXEC_SHIFT         5
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#define PAGE_NOT_CACHEABLE      (0<<PAGE_CACHEABLE_SHIFT)
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#define PAGE_CACHEABLE          (1<<PAGE_CACHEABLE_SHIFT)
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#define PAGE_PRESENT            (0<<PAGE_PRESENT_SHIFT)
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#define PAGE_NOT_PRESENT        (1<<PAGE_PRESENT_SHIFT)
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#define PAGE_USER               (1<<PAGE_USER_SHIFT)
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#define PAGE_KERNEL             (0<<PAGE_USER_SHIFT)
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#define PAGE_READ       (1<<PAGE_READ_SHIFT)
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#define PAGE_WRITE      (1<<PAGE_WRITE_SHIFT)
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#define PAGE_EXEC       (1<<PAGE_EXEC_SHIFT)
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/*
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 * This is the generic 4-level page table interface.
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 * Architectures are supposed to implement *_ARCH macros.
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 */
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/*
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 * These macros process vaddr and extract those portions
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 * of it that function as indices to respective page tables.
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 */
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#define PTL0_INDEX(vaddr)       PTL0_INDEX_ARCH(vaddr)
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#define PTL1_INDEX(vaddr)       PTL1_INDEX_ARCH(vaddr)
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#define PTL2_INDEX(vaddr)       PTL2_INDEX_ARCH(vaddr)
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#define PTL3_INDEX(vaddr)       PTL3_INDEX_ARCH(vaddr)
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#define GET_PTL0_ADDRESS()      GET_PTL0_ADDRESS_ARCH()
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#define SET_PTL0_ADDRESS(ptl0)      SET_PTL0_ADDRESS_ARCH(ptl0)
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/*
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 * These macros traverse the 4-level tree of page tables,
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 * each descending by one level.
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 */
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#define GET_PTL0_ADDRESS()      GET_PTL0_ADDRESS_ARCH()
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#define GET_PTL1_ADDRESS(ptl0, i)   GET_PTL1_ADDRESS_ARCH(ptl0, i)
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#define GET_PTL2_ADDRESS(ptl1, i)   GET_PTL2_ADDRESS_ARCH(ptl1, i)
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#define GET_PTL3_ADDRESS(ptl2, i)   GET_PTL3_ADDRESS_ARCH(ptl2, i)
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#define GET_FRAME_ADDRESS(ptl3, i)  GET_FRAME_ADDRESS_ARCH(ptl3, i)
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/*
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 * These macros are provided to change shape of the 4-level
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 * tree of page tables on respective level.
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 */
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#define SET_PTL0_ADDRESS(ptl0)      SET_PTL0_ADDRESS_ARCH(ptl0)
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#define SET_PTL1_ADDRESS(ptl0, i, a)    SET_PTL1_ADDRESS_ARCH(ptl0, i, a)
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#define SET_PTL2_ADDRESS(ptl1, i, a)    SET_PTL2_ADDRESS_ARCH(ptl1, i, a)
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#define SET_PTL3_ADDRESS(ptl2, i, a)    SET_PTL3_ADDRESS_ARCH(ptl2, i, a)
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#define SET_FRAME_ADDRESS(ptl3, i, a)   SET_FRAME_ADDRESS_ARCH(ptl3, i, a)
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/*
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 * These macros are provided to query various flags within the page tables.
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 */
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#define GET_PTL1_FLAGS(ptl0, i)     GET_PTL1_FLAGS_ARCH(ptl0, i)
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#define GET_PTL2_FLAGS(ptl1, i)     GET_PTL2_FLAGS_ARCH(ptl1, i)
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#define GET_PTL3_FLAGS(ptl2, i)     GET_PTL3_FLAGS_ARCH(ptl2, i)
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#define GET_FRAME_FLAGS(ptl3, i)    GET_FRAME_FLAGS_ARCH(ptl3, i)
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/*
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 * These macros are provided to set/clear various flags within the page tables.
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 */
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#define SET_PTL1_FLAGS(ptl0, i, x)  SET_PTL1_FLAGS_ARCH(ptl0, i, x)
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#define SET_PTL2_FLAGS(ptl1, i, x)  SET_PTL2_FLAGS_ARCH(ptl1, i, x)
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#define SET_PTL3_FLAGS(ptl2, i, x)  SET_PTL3_FLAGS_ARCH(ptl2, i, x)
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#define SET_FRAME_FLAGS(ptl3, i, x) SET_FRAME_FLAGS_ARCH(ptl3, i, x)
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#include <arch/mm/page.h>
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extern void page_init(void);
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extern void map_page_to_frame(__address page, __address frame, int flags, __address root);
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extern void map_structure(__address s, size_t size);
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#endif