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 * @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. serviced).
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 * @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. serviced).
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 */
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 */
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int phys_page_fault(as_area_t *area, __address addr, pf_access_t access)
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int phys_page_fault(as_area_t *area, __address addr, pf_access_t access)
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{
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{
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    __address base = area->backend_data.base;
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    __address base = area->backend_data.base;
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    count_t frames = area->backend_data.frames;
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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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    ASSERT(addr - area->base < frames * FRAME_SIZE);
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    ASSERT(addr - area->base < area->backend_data.frames * FRAME_SIZE);
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    page_mapping_insert(AS, addr, base + (addr - area->base), as_area_get_flags(area));
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    page_mapping_insert(AS, addr, base + (addr - area->base), as_area_get_flags(area));
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        if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1))
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        if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1))
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                panic("Could not insert used space.\n");
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                panic("Could not insert used space.\n");
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    return AS_PF_OK;
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    return AS_PF_OK;