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Rev 226 Rev 251
Line 81... Line 81...
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    if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) {
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    if (GET_PTL1_FLAGS(ptl0, PTL0_INDEX(page)) & PAGE_NOT_PRESENT) {
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        newpt = frame_alloc(FRAME_KA);
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        newpt = frame_alloc(FRAME_KA);
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        memsetb(newpt, PAGE_SIZE, 0);
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        memsetb(newpt, PAGE_SIZE, 0);
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        SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt));
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        SET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page), KA2PA(newpt));
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        SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT | PAGE_USER);
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        SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC);
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    }
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    }
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    ptl1 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(ptl0, PTL0_INDEX(page)));
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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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    if (GET_PTL2_FLAGS(ptl1, PTL1_INDEX(page)) & PAGE_NOT_PRESENT) {
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        newpt = frame_alloc(FRAME_KA);
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        newpt = frame_alloc(FRAME_KA);
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        memsetb(newpt, PAGE_SIZE, 0);
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        memsetb(newpt, PAGE_SIZE, 0);
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        SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt));
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        SET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page), KA2PA(newpt));
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        SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT | PAGE_USER);
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        SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC);
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    }
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    }
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    ptl2 = (pte_t *) PA2KA(GET_PTL2_ADDRESS(ptl1, PTL1_INDEX(page)));
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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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    if (GET_PTL3_FLAGS(ptl2, PTL2_INDEX(page)) & PAGE_NOT_PRESENT) {
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        newpt = frame_alloc(FRAME_KA);
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        newpt = frame_alloc(FRAME_KA);
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        memsetb(newpt, PAGE_SIZE, 0);
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        memsetb(newpt, PAGE_SIZE, 0);
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        SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt));
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        SET_PTL3_ADDRESS(ptl2, PTL2_INDEX(page), KA2PA(newpt));
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        SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT | PAGE_USER);
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        SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC);
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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);