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            /*
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            /*
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             * Releasing physical memory.
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             * Releasing physical memory.
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             * This depends on the fact that the memory was allocated using frame_alloc().
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             * This depends on the fact that the memory was allocated using frame_alloc().
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             */
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             */
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            pte = page_mapping_find(as, area->base + i*PAGE_SIZE);
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            pte = page_mapping_find(as, area->base + i*PAGE_SIZE);
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            if (pte) {
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            if (pte && PTE_VALID(pte)) {
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                ASSERT(PTE_PRESENT(pte));
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                ASSERT(PTE_PRESENT(pte));
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                frame_free(ADDR2PFN(PTE_GET_FRAME(pte)));
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                frame_free(ADDR2PFN(PTE_GET_FRAME(pte)));
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            }
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            }
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            page_mapping_remove(as, area->base + i*PAGE_SIZE);
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            page_mapping_remove(as, area->base + i*PAGE_SIZE);
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        }
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        }