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    btree_t pagemap;    /**< B+tree containing complete map of anonymous pages of the shared area. */
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    btree_t pagemap;    /**< B+tree containing complete map of anonymous pages of the shared area. */
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} share_info_t;
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} share_info_t;
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/** Address space area backend structure. */
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/** Address space area backend structure. */
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typedef struct {
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typedef struct {
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    int (* page_fault)(as_area_t *area, __address addr, pf_access_t access);
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    int (* page_fault)(as_area_t *area, uintptr_t addr, pf_access_t access);
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    void (* frame_free)(as_area_t *area, __address page, __address frame);
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    void (* frame_free)(as_area_t *area, uintptr_t page, uintptr_t frame);
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    void (* share)(as_area_t *area);
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    void (* share)(as_area_t *area);
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} mem_backend_t;
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} mem_backend_t;
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/** Backend data stored in address space area. */
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/** Backend data stored in address space area. */
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typedef union {
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typedef union {
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    struct {    /**< elf_backend members */
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    struct {    /**< elf_backend members */
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        elf_header_t *elf;
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        elf_header_t *elf;
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        elf_segment_header_t *segment;
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        elf_segment_header_t *segment;
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    };
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    };
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    struct {    /**< phys_backend members */
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    struct {    /**< phys_backend members */
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        __address base;
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        uintptr_t base;
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        count_t frames;
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        count_t frames;
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    };
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    };
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} mem_backend_data_t;
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} mem_backend_data_t;
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/** Address space area structure.
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/** Address space area structure.
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    mutex_t lock;
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    mutex_t lock;
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    as_t *as;       /**< Containing address space. */
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    as_t *as;       /**< Containing address space. */
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    int flags;      /**< Flags related to the memory represented by the address space area. */
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    int flags;      /**< Flags related to the memory represented by the address space area. */
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    int attributes;     /**< Attributes related to the address space area itself. */
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    int attributes;     /**< Attributes related to the address space area itself. */
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    count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */
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    count_t pages;      /**< Size of this area in multiples of PAGE_SIZE. */
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    __address base;     /**< Base address of this area. */
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    uintptr_t base;     /**< Base address of this area. */
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    btree_t used_space; /**< Map of used space. */
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    btree_t used_space; /**< Map of used space. */
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    share_info_t *sh_info;  /**< If the address space area has been shared, this pointer will
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    share_info_t *sh_info;  /**< If the address space area has been shared, this pointer will
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                         reference the share info structure. */
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                         reference the share info structure. */
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    mem_backend_t *backend; /**< Memory backend backing this address space area. */
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    mem_backend_t *backend; /**< Memory backend backing this address space area. */
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extern void as_init(void);
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extern void as_init(void);
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extern as_t *as_create(int flags);
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extern as_t *as_create(int flags);
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extern void as_destroy(as_t *as);
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extern void as_destroy(as_t *as);
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extern void as_switch(as_t *old, as_t *new);
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extern void as_switch(as_t *old, as_t *new);
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extern int as_page_fault(__address page, pf_access_t access, istate_t *istate);
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extern int as_page_fault(uintptr_t page, pf_access_t access, istate_t *istate);
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extern as_area_t *as_area_create(as_t *as, int flags, size_t size, __address base, int attrs,
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extern as_area_t *as_area_create(as_t *as, int flags, size_t size, uintptr_t base, int attrs,
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    mem_backend_t *backend, mem_backend_data_t *backend_data);
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    mem_backend_t *backend, mem_backend_data_t *backend_data);
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extern int as_area_destroy(as_t *as, __address address);   
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extern int as_area_destroy(as_t *as, uintptr_t address);   
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extern int as_area_resize(as_t *as, __address address, size_t size, int flags);
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extern int as_area_resize(as_t *as, uintptr_t address, size_t size, int flags);
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int as_area_share(as_t *src_as, __address src_base, size_t acc_size,
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int as_area_share(as_t *src_as, uintptr_t src_base, size_t acc_size,
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          as_t *dst_as, __address dst_base, int dst_flags_mask);
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          as_t *dst_as, uintptr_t dst_base, int dst_flags_mask);
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extern int as_area_get_flags(as_area_t *area);
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extern int as_area_get_flags(as_area_t *area);
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extern bool as_area_check_access(as_area_t *area, pf_access_t access);
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extern bool as_area_check_access(as_area_t *area, pf_access_t access);
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extern size_t as_get_size(__address base);
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extern size_t as_get_size(uintptr_t base);
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extern int used_space_insert(as_area_t *a, __address page, count_t count);
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extern int used_space_insert(as_area_t *a, uintptr_t page, count_t count);
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extern int used_space_remove(as_area_t *a, __address page, count_t count);
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extern int used_space_remove(as_area_t *a, uintptr_t page, count_t count);
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/* Interface to be implemented by architectures. */
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/* Interface to be implemented by architectures. */
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#ifndef as_install_arch
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#ifndef as_install_arch
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extern void as_install_arch(as_t *as);
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extern void as_install_arch(as_t *as);
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#endif /* !def as_install_arch */
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#endif /* !def as_install_arch */
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extern mem_backend_t anon_backend;
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extern mem_backend_t anon_backend;
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extern mem_backend_t elf_backend;
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extern mem_backend_t elf_backend;
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extern mem_backend_t phys_backend;
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extern mem_backend_t phys_backend;
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/* Address space area related syscalls. */
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/* Address space area related syscalls. */
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extern __native sys_as_area_create(__address address, size_t size, int flags);
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extern unative_t sys_as_area_create(uintptr_t address, size_t size, int flags);
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extern __native sys_as_area_resize(__address address, size_t size, int flags);
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extern unative_t sys_as_area_resize(uintptr_t address, size_t size, int flags);
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extern __native sys_as_area_destroy(__address address);
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extern unative_t sys_as_area_destroy(uintptr_t address);
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#endif /* KERNEL */
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#endif /* KERNEL */
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#endif
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#endif
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