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#define UTEXT_ADDRESS   UTEXT_ADDRESS_ARCH
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#define UTEXT_ADDRESS   UTEXT_ADDRESS_ARCH
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#define USTACK_ADDRESS  USTACK_ADDRESS_ARCH
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#define USTACK_ADDRESS  USTACK_ADDRESS_ARCH
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#define UDATA_ADDRESS   UDATA_ADDRESS_ARCH
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#define UDATA_ADDRESS   UDATA_ADDRESS_ARCH
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#define AS_KERNEL   (1<<0)      /**< Kernel address space. */
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enum as_area_type {
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enum as_area_type {
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    AS_AREA_TEXT = 1, AS_AREA_DATA, AS_AREA_STACK
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    AS_AREA_TEXT = 1, AS_AREA_DATA, AS_AREA_STACK
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};
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};
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/** Address space area structure.
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/** Address space area structure.
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 */
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 */
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struct as_area {
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struct as_area {
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    SPINLOCK_DECLARE(lock);
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    SPINLOCK_DECLARE(lock);
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    link_t link;
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    link_t link;
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    as_area_type_t type;
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    as_area_type_t type;
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    size_t size;        /**< Size of this area. */
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    size_t size;        /**< Size of this area in multiples of PAGE_SIZE. */
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    __address base;     /**< Base address of this area. */
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    __address base;     /**< Base address of this area. */
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    index_t *mapping;   /**< Map of physical frame numbers mapped to virtual page numbers in this area. */
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    index_t *mapping;   /**< Map of physical frame numbers mapped to virtual page numbers in this area. */
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};
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};
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/** Address space structure.
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/** Address space structure.
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 * pages for one or more tasks. Ranges of kernel memory pages are not
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 * pages for one or more tasks. Ranges of kernel memory pages are not
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 * supposed to figure in the list as they are shared by all tasks and
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 * supposed to figure in the list as they are shared by all tasks and
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 * set up during system initialization.
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 * set up during system initialization.
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 */
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 */
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struct as {
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struct as {
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    /** Protected by asidlock. Must be acquired before as-> lock. */
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    link_t as_with_asid_link;
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    SPINLOCK_DECLARE(lock);
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    SPINLOCK_DECLARE(lock);
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    link_t as_area_head;
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    link_t as_area_head;
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    pte_t *ptl0;
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    pte_t *ptl0;
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    asid_t asid;            /**< Address space identifier. */
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    asid_t asid;            /**< Address space identifier. */
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};
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};
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extern as_t * as_create(pte_t *ptl0);
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extern as_t * as_create(pte_t *ptl0, int flags);
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extern as_area_t *as_area_create(as_t *as, as_area_type_t type, size_t size, __address base);
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extern as_area_t *as_area_create(as_t *as, as_area_type_t type, size_t size, __address base);
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extern void as_area_set_mapping(as_area_t *a, index_t vpn, index_t pfn);
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extern void as_area_set_mapping(as_area_t *a, index_t vpn, index_t pfn);
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extern int as_page_fault(__address page);
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extern int as_page_fault(__address page);
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extern void as_install(as_t *m);
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extern void as_install(as_t *m);
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/*
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 * Each architecture should implement this function.
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/* Interface to be implemented by architectures. */
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 * Its main purpose is to do TLB purges according
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 * to architecture's requirements. Note that
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 * some architectures invalidate their TLB automatically
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 * on hardware address space switch (e.g. ia32 and
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 * amd64).
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 */
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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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#endif
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#endif