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/*

 * Copyright (C) 2001-2004 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.

 */

#ifndef __PAGE_H__

#define __PAGE_H__

#include <arch/mm/asid.h>

#include <arch/types.h>

#include <typedefs.h>

#include <memstr.h>

#define PAGE_CACHEABLE_SHIFT        0

#define PAGE_NOT_CACHEABLE_SHIFT    PAGE_CACHEABLE_SHIFT

#define PAGE_PRESENT_SHIFT      1

#define PAGE_NOT_PRESENT_SHIFT      PAGE_PRESENT_SHIFT

#define PAGE_USER_SHIFT         2

#define PAGE_KERNEL_SHIFT       PAGE_USER_SHIFT

#define PAGE_READ_SHIFT         3

#define PAGE_WRITE_SHIFT        4

#define PAGE_EXEC_SHIFT         5

#define PAGE_GLOBAL_SHIFT       6

#define PAGE_NOT_CACHEABLE  (0<<PAGE_CACHEABLE_SHIFT)

#define PAGE_CACHEABLE      (1<<PAGE_CACHEABLE_SHIFT)

#define PAGE_PRESENT        (0<<PAGE_PRESENT_SHIFT)

#define PAGE_NOT_PRESENT    (1<<PAGE_PRESENT_SHIFT)

#define PAGE_USER       (1<<PAGE_USER_SHIFT)

#define PAGE_KERNEL     (0<<PAGE_USER_SHIFT)

#define PAGE_READ       (1<<PAGE_READ_SHIFT)

#define PAGE_WRITE      (1<<PAGE_WRITE_SHIFT)

#define PAGE_EXEC       (1<<PAGE_EXEC_SHIFT)

#define PAGE_GLOBAL     (1<<PAGE_GLOBAL_SHIFT)

/* TODO - check that userspace is OK, platform specific functions etc */

static inline void copy_to_uspace(void *dst, void *src, count_t cnt)

{

    memcpy(dst, src, cnt);

}

static inline void copy_from_uspace(void *dst, void *src, count_t cnt)

{

    memcpy(dst, src, cnt);

}

/** Operations to manipulate page mappings. */

struct page_mapping_operations {

    void (* mapping_insert)(as_t *as, __address page, __address frame, int flags);

    void (* mapping_remove)(as_t *as, __address page);

    pte_t *(* mapping_find)(as_t *as, __address page);

};

typedef struct page_mapping_operations page_mapping_operations_t;

extern page_mapping_operations_t *page_mapping_operations;

extern void page_init(void);

extern void page_table_lock(as_t *as, bool lock);

extern void page_table_unlock(as_t *as, bool unlock);

extern void page_mapping_insert(as_t *as, __address page, __address frame, int flags);

extern void page_mapping_remove(as_t *as, __address page);

extern pte_t *page_mapping_find(as_t *as, __address page);

extern pte_t *page_table_create(int flags);

extern void map_structure(__address s, size_t size);

#endif