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#define PAGE_HT_ENTRIES     (1<<PAGE_HT_ENTRIES_BITS)
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#define PAGE_HT_ENTRIES     (1<<PAGE_HT_ENTRIES_BITS)
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#define PTE_VALID(pte)      ((pte) != NULL)
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#define PTE_VALID(pte)      ((pte) != NULL)
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#define PTE_PRESENT(pte)    ((pte)->p != 0)
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#define PTE_PRESENT(pte)    ((pte)->p != 0)
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#define PTE_GET_FRAME(pte)  ((pte)->frame)
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#define PTE_GET_FRAME(pte)  ((pte)->frame)
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#define PTE_READABLE(pte)   1
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#define PTE_WRITABLE(pte)   ((pte)->w != 0)
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#define PTE_EXECUTABLE(pte) ((pte)->x != 0)
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#define SET_PTL0_ADDRESS(x)
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#define SET_PTL0_ADDRESS(x)
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struct pte {
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struct pte {
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    link_t link;        /**< Page hash table link. */
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    link_t link;        /**< Page hash table link. */