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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 __AS_H__

#define __AS_H__

#include <arch/mm/page.h>

#include <arch/mm/as.h>

#include <arch/mm/asid.h>

#include <arch/types.h>

#include <typedefs.h>

#include <synch/spinlock.h>

#include <adt/list.h>

#include <adt/btree.h>

/** Defined to be true if user address space and kernel address space shadow each other. */

#define KERNEL_ADDRESS_SPACE_SHADOWED   KERNEL_ADDRESS_SPACE_SHADOWED_ARCH

#define KERNEL_ADDRESS_SPACE_START  KERNEL_ADDRESS_SPACE_START_ARCH

#define KERNEL_ADDRESS_SPACE_END    KERNEL_ADDRESS_SPACE_END_ARCH

#define USER_ADDRESS_SPACE_START    USER_ADDRESS_SPACE_START_ARCH

#define USER_ADDRESS_SPACE_END      USER_ADDRESS_SPACE_END_ARCH

#define IS_KA(addr) ((addr)>=KERNEL_ADDRESS_SPACE_START && (addr)<=KERNEL_ADDRESS_SPACE_END)

#define USTACK_ADDRESS  USTACK_ADDRESS_ARCH

#define FLAG_AS_KERNEL      (1 << 0)    /**< Kernel address space. */

/** Address space area flags. */

#define AS_AREA_READ    1

#define AS_AREA_WRITE   2

#define AS_AREA_EXEC    4

#define AS_AREA_DEVICE  8

/** Address space area structure.

 *

 * Each as_area_t structure describes one contiguous area of virtual memory.

 * In the future, it should not be difficult to support shared areas.

 */

struct as_area {

    SPINLOCK_DECLARE(lock);

    int flags;

    count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */

    __address base;     /**< Base address of this area. */

};

/** Address space structure.

 *

 * as_t contains the list of as_areas of userspace accessible

 * pages for one or more tasks. Ranges of kernel memory pages are not

 * supposed to figure in the list as they are shared by all tasks and

 * set up during system initialization.

 */

struct as {

    /** Protected by asidlock. Must be acquired before as->lock. */

    link_t inactive_as_with_asid_link;

    SPINLOCK_DECLARE(lock);

    /** Number of processors on wich is this address space active. */

    count_t refcount;

    /** B+tree of address space areas. */

    btree_t as_area_btree;

    /** Page table pointer. Constant on architectures that use global page hash table. */

    pte_t *page_table;

    /** Address space identifier. Constant on architectures that do not support ASIDs.*/

    asid_t asid;

};

struct as_operations {

    pte_t *(* page_table_create)(int flags);

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

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

};

typedef struct as_operations as_operations_t;

extern as_t *AS_KERNEL;

extern as_operations_t *as_operations;

extern spinlock_t as_lock;

extern link_t inactive_as_with_asid_head;

extern void as_init(void);

extern as_t *as_create(int flags);

extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base);

extern __address as_area_resize(as_t *as, __address address, size_t size, int flags);

extern void as_set_mapping(as_t *as, __address page, __address frame);

extern int as_page_fault(__address page);

extern void as_switch(as_t *old, as_t *new);

extern void as_free(as_t *as);

/* Interface to be implemented by architectures. */

#ifndef as_install_arch

extern void as_install_arch(as_t *as);

#endif /* !def as_install_arch */

#endif