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 */
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 */
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typedef struct {
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typedef struct {
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    mutex_t lock;
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    mutex_t lock;
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    /** Containing address space. */
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    /** Containing address space. */
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    as_t *as;      
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    as_t *as;      
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    /**
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    /** Flags related to the memory represented by the address space area. */
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     * Flags related to the memory represented by the address space area.
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     */
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    int flags;
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    int flags;
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    /** Attributes related to the address space area itself. */
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    /** Attributes related to the address space area itself. */
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    int attributes;
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    int attributes;
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    /** Size of this area in multiples of PAGE_SIZE. */
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    /** Size of this area in multiples of PAGE_SIZE. */
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    count_t pages;
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    count_t pages;
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    uintptr_t base;
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    uintptr_t base;
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    /** Map of used space. */
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    /** Map of used space. */
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    btree_t used_space;
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    btree_t used_space;
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    /**
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    /**
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     * If the address space area has been shared, this pointer will reference
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     * If the address space area has been shared, this pointer will
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     * the share info structure.
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     * reference the share info structure.
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     */
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     */
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    share_info_t *sh_info;
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    share_info_t *sh_info;
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    /** Memory backend backing this address space area. */
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    /** Memory backend backing this address space area. */
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    struct mem_backend *backend;
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    struct mem_backend *backend;