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#include <arch/mm/asid.h>

#include <adt/list.h>

#include <adt/btree.h>

#include <synch/mutex.h>

/** 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.

 */

typedef struct {

    /** Protected by asidlock. */

    mutex_t lock;

    /** Number of references (i.e tasks that reference this as). */

    count_t refcount;

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

    count_t cpu_refcount;

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

    btree_t as_area_btree;

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

    asid_t asid;

    /** Architecture specific content. */

    as_arch_t arch;

} as_t;

typedef struct {

    link_t link;        /**< Page hash table link. */

    as_t *as;       /**< Address space. */

    uintptr_t page;     /**< Virtual memory page. */

    uintptr_t frame;    /**< Physical memory frame. */

    unsigned g : 1;     /**< Global page. */

    unsigned x : 1;     /**< Execute. */

    unsigned w : 1;     /**< Writable. */

    unsigned k : 1;     /**< Kernel privileges required. */

    unsigned c : 1;     /**< Cacheable. */

    unsigned a : 1;     /**< Accessed. */

    unsigned d : 1;     /**< Dirty. */

    unsigned p : 1;     /**< Present. */

} pte_t;