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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 <list.h>

#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 UTEXT_ADDRESS   UTEXT_ADDRESS_ARCH

#define USTACK_ADDRESS  USTACK_ADDRESS_ARCH

#define UDATA_ADDRESS   UDATA_ADDRESS_ARCH

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

enum as_area_type {

    AS_AREA_TEXT = 1, AS_AREA_DATA, AS_AREA_STACK

};

/** 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);

    link_t link;

    as_area_type_t type;

    size_t size;        /**< 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 as_with_asid_link;

    SPINLOCK_DECLARE(lock);

    link_t as_area_head;

    pte_t *ptl0;

    asid_t asid;            /**< Address space identifier. */

};

extern as_t *AS_KERNEL;

extern as_t *as_create(pte_t *ptl0, int flags);

extern as_area_t *as_area_create(as_t *as, as_area_type_t type, size_t size, __address base);

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

extern int as_page_fault(__address page);

extern void as_install(as_t *m);

/* Interface to be implemented by architectures. */

#ifndef as_install_arch

extern void as_install_arch(as_t *as);

#endif /* !def as_install_arch */

#endif