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#include <arch/types.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <typedefs.h>
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#include <arch/asm.h>
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#include <arch/asm.h>
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#include <memstr.h>
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#include <memstr.h>
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void page_init(void)
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void page_init(void)
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{
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{
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    page_arch_init();
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    page_arch_init();
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    map_page_to_frame(0x0, 0x0, PAGE_NOT_PRESENT, 0);
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    map_page_to_frame(0x0, 0x0, PAGE_NOT_PRESENT, 0);
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}
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}
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    ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page)));
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    ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page)));
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    SET_FRAME_ADDRESS(ptl3, PTL3_INDEX(page), frame);
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    SET_FRAME_ADDRESS(ptl3, PTL3_INDEX(page), frame);
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    SET_FRAME_FLAGS(ptl3, PTL3_INDEX(page), flags);
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    SET_FRAME_FLAGS(ptl3, PTL3_INDEX(page), flags);
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}
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}
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/** Find mapping for virtual page
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 *
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 * Find mapping for virtual page.
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 *
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 * @param page Virtual page.
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 * @param root PTL0 address if non-zero.
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 *
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 * @return NULL if there is no such mapping; entry from PTL3 describing the mapping otherwise.
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 */
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pte_t *find_mapping(__address page, __address root)
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{
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    pte_t *ptl0, *ptl1, *ptl2, *ptl3;
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    ptl0 = (pte_t *) PA2KA(root ? root : (__address) GET_PTL0_ADDRESS());
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    if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT)
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        return NULL;
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    ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));
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    if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT)
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        return NULL;
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    ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));
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    if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT)
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        return NULL;
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    ptl3 = (pte_t *) PA2KA(GET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page)));
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    return &ptl3[PTL3_INDEX(page)];
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}