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Rev 704 Rev 711
Line 248... Line 248...
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     * Decide if a frame needs to be allocated.
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     * Decide if a frame needs to be allocated.
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     * If so, allocate it and adjust area->mapping map.
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     * If so, allocate it and adjust area->mapping map.
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     */
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     */
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    if (area->mapping[vpn] == UNALLOCATED_PFN) {
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    if (area->mapping[vpn] == UNALLOCATED_PFN) {
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        frame = frame_alloc(0, ONE_FRAME, NULL);
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        frame = frame_alloc(0, ONE_FRAME, NULL);
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        memsetb(frame, FRAME_SIZE, 0);
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        memsetb(PA2KA(frame), FRAME_SIZE, 0);
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        area->mapping[vpn] = frame / FRAME_SIZE;
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        area->mapping[vpn] = frame / FRAME_SIZE;
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        ASSERT(area->mapping[vpn] != UNALLOCATED_PFN);
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        ASSERT(area->mapping[vpn] != UNALLOCATED_PFN);
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    } else {
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    } else {
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        frame = area->mapping[vpn] * FRAME_SIZE;
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        frame = area->mapping[vpn] * FRAME_SIZE;
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    }
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    }