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Rev 3104 Rev 3382
Line 76... Line 76...
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 *     serviced).
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 *     serviced).
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 */
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 */
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int anon_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access)
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int anon_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access)
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{
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{
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    uintptr_t frame;
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    uintptr_t frame;
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    bool dirty = false;
-
 
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    if (!as_area_check_access(area, access))
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    if (!as_area_check_access(area, access))
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        return AS_PF_FAULT;
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        return AS_PF_FAULT;
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    if (area->sh_info) {
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    if (area->sh_info) {
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             * Zero can be returned as a valid frame address.
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             * Zero can be returned as a valid frame address.
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             * Just a small workaround.
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             * Just a small workaround.
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             */
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             */
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            for (i = 0; i < leaf->keys; i++) {
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            for (i = 0; i < leaf->keys; i++) {
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                if (leaf->key[i] ==
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                if (leaf->key[i] ==
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                    ALIGN_DOWN(addr, PAGE_SIZE)) {
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                    ALIGN_DOWN(addr, PAGE_SIZE) - area->base) {
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                    allocate = false;
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                    allocate = false;
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                    break;
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                    break;
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                }
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                }
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            }
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            }
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            if (allocate) {
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            if (allocate) {
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                frame = (uintptr_t) frame_alloc(ONE_FRAME, 0);
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                frame = (uintptr_t) frame_alloc(ONE_FRAME, 0);
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                memsetb((void *) PA2KA(frame), FRAME_SIZE, 0);
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                memsetb((void *) PA2KA(frame), FRAME_SIZE, 0);
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                dirty = true;
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                /*
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                /*
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                 * Insert the address of the newly allocated
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                 * Insert the address of the newly allocated
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                 * frame to the pagemap.
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                 * frame to the pagemap.
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                 */
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                 */
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         *   do not forget to distinguish between
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         *   do not forget to distinguish between
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         *   the different causes
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         *   the different causes
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         */
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         */
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        frame = (uintptr_t) frame_alloc(ONE_FRAME, 0);
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        frame = (uintptr_t) frame_alloc(ONE_FRAME, 0);
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        memsetb((void *) PA2KA(frame), FRAME_SIZE, 0);
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        memsetb((void *) PA2KA(frame), FRAME_SIZE, 0);
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        dirty = true;
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    }
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    }
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    /*
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    /*
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     * Map 'page' to 'frame'.
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     * Map 'page' to 'frame'.
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     * Note that TLB shootdown is not attempted as only new information is
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     * Note that TLB shootdown is not attempted as only new information is