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Rev 2465 Rev 3104
Line 74... Line 74...
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    ptl0 = (pte_t *) PA2KA((uintptr_t) as->genarch.page_table);
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    ptl0 = (pte_t *) PA2KA((uintptr_t) as->genarch.page_table);
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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 = (pte_t *)frame_alloc(PTL1_SIZE, FRAME_KA);
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        newpt = (pte_t *)frame_alloc(PTL1_SIZE, FRAME_KA);
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        memsetb((uintptr_t)newpt, FRAME_SIZE << PTL1_SIZE, 0);
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        memsetb(newpt, FRAME_SIZE << PTL1_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 | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
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        SET_PTL1_FLAGS(ptl0, PTL0_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
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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 = (pte_t *)frame_alloc(PTL2_SIZE, FRAME_KA);
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        newpt = (pte_t *)frame_alloc(PTL2_SIZE, FRAME_KA);
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        memsetb((uintptr_t)newpt, FRAME_SIZE << PTL2_SIZE, 0);
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        memsetb(newpt, FRAME_SIZE << PTL2_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 | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
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        SET_PTL2_FLAGS(ptl1, PTL1_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
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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 = (pte_t *)frame_alloc(PTL3_SIZE, FRAME_KA);
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        newpt = (pte_t *)frame_alloc(PTL3_SIZE, FRAME_KA);
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        memsetb((uintptr_t)newpt, FRAME_SIZE << PTL3_SIZE, 0);
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        memsetb(newpt, FRAME_SIZE << PTL3_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 | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
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        SET_PTL3_FLAGS(ptl2, PTL2_INDEX(page), PAGE_PRESENT | PAGE_USER | PAGE_EXEC | PAGE_CACHEABLE | PAGE_WRITE);
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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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        return;
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        return;
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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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    /* Destroy the mapping. Setting to PAGE_NOT_PRESENT is not sufficient. */
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    /* Destroy the mapping. Setting to PAGE_NOT_PRESENT is not sufficient. */
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    memsetb((uintptr_t) &ptl3[PTL3_INDEX(page)], sizeof(pte_t), 0);
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    memsetb(&ptl3[PTL3_INDEX(page)], sizeof(pte_t), 0);
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    /*
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    /*
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     * Second, free all empty tables along the way from PTL3 down to PTL0.
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     * Second, free all empty tables along the way from PTL3 down to PTL0.
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     */
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     */
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         * PTL3 is empty.
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         * PTL3 is empty.
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         * Release the frame and remove PTL3 pointer from preceding table.
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         * Release the frame and remove PTL3 pointer from preceding table.
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         */
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         */
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        frame_free(KA2PA((uintptr_t) ptl3));
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        frame_free(KA2PA((uintptr_t) ptl3));
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        if (PTL2_ENTRIES)
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        if (PTL2_ENTRIES)
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            memsetb((uintptr_t) &ptl2[PTL2_INDEX(page)], sizeof(pte_t), 0);
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            memsetb(&ptl2[PTL2_INDEX(page)], sizeof(pte_t), 0);
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        else if (PTL1_ENTRIES)
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        else if (PTL1_ENTRIES)
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            memsetb((uintptr_t) &ptl1[PTL1_INDEX(page)], sizeof(pte_t), 0);
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            memsetb(&ptl1[PTL1_INDEX(page)], sizeof(pte_t), 0);
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        else
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        else
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            memsetb((uintptr_t) &ptl0[PTL0_INDEX(page)], sizeof(pte_t), 0);
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            memsetb(&ptl0[PTL0_INDEX(page)], sizeof(pte_t), 0);
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    } else {
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    } else {
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        /*
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        /*
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         * PTL3 is not empty.
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         * PTL3 is not empty.
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         * Therefore, there must be a path from PTL0 to PTL3 and
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         * Therefore, there must be a path from PTL0 to PTL3 and
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         * thus nothing to free in higher levels.
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         * thus nothing to free in higher levels.
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             * PTL2 is empty.
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             * PTL2 is empty.
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             * Release the frame and remove PTL2 pointer from preceding table.
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             * Release the frame and remove PTL2 pointer from preceding table.
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             */
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             */
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            frame_free(KA2PA((uintptr_t) ptl2));
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            frame_free(KA2PA((uintptr_t) ptl2));
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            if (PTL1_ENTRIES)
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            if (PTL1_ENTRIES)
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                memsetb((uintptr_t) &ptl1[PTL1_INDEX(page)], sizeof(pte_t), 0);
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                memsetb(&ptl1[PTL1_INDEX(page)], sizeof(pte_t), 0);
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            else
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            else
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                memsetb((uintptr_t) &ptl0[PTL0_INDEX(page)], sizeof(pte_t), 0);
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                memsetb(&ptl0[PTL0_INDEX(page)], sizeof(pte_t), 0);
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        }
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        }
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        else {
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        else {
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            /*
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            /*
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             * PTL2 is not empty.
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             * PTL2 is not empty.
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             * Therefore, there must be a path from PTL0 to PTL2 and
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             * Therefore, there must be a path from PTL0 to PTL2 and
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            /*
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            /*
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             * PTL1 is empty.
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             * PTL1 is empty.
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             * Release the frame and remove PTL1 pointer from preceding table.
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             * Release the frame and remove PTL1 pointer from preceding table.
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             */
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             */
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            frame_free(KA2PA((uintptr_t) ptl1));
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            frame_free(KA2PA((uintptr_t) ptl1));
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            memsetb((uintptr_t) &ptl0[PTL0_INDEX(page)], sizeof(pte_t), 0);
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            memsetb(&ptl0[PTL0_INDEX(page)], sizeof(pte_t), 0);
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        }
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        }
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    }
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    }
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}
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}
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