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    pte_t *page_table;
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    pte_t *page_table;
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    /** Address space identifier. Constant on architectures that do not support ASIDs.*/
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    /** Address space identifier. Constant on architectures that do not support ASIDs.*/
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    asid_t asid;
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    asid_t asid;
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#ifdef CONFIG_VIRT_IDX_DCACHE
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    bool dcache_flush_on_install;
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    bool dcache_flush_on_deinstall;
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#endif /* CONFIG_VIRT_IDX_DCACHE */
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    /** Architecture specific content. */
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    /** Architecture specific content. */
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    as_arch_t arch;
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    as_arch_t arch;
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};
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};
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struct as_operations {
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struct as_operations {
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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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    /** Data to be used by the backend. */
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    /** Data to be used by the backend. */
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    mem_backend_data_t backend_data;
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    mem_backend_data_t backend_data;
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    /**
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     * Virtual color of the original address space area that was at the beginning
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     * of the share chain.
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     */
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    int orig_color;
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};
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};
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extern as_t *AS_KERNEL;
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extern as_t *AS_KERNEL;
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extern as_operations_t *as_operations;
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extern as_operations_t *as_operations;
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