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        /*
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        /*
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         * Each vm_t is supposed to have its own page table.
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         * Each vm_t is supposed to have its own page table.
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         * It is either passed one or it has to allocate and set one up.
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         * It is either passed one or it has to allocate and set one up.
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         */
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         */
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        m->ptl0 = ptl0;
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        if (!(m->ptl0 = ptl0)) {
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        if (!m->ptl0) {
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            pte_t *src_ptl0, *dst_ptl0;
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            pte_t *src_ptl0, *dst_ptl0;
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            src_ptl0 = (pte_t *) PA2KA(GET_PTL0_ADDRESS());
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            src_ptl0 = (pte_t *) PA2KA((__address) GET_PTL0_ADDRESS());
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            dst_ptl0 = (pte_t *) frame_alloc(FRAME_KA | FRAME_PANIC);
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            dst_ptl0 = (pte_t *) frame_alloc(FRAME_KA | FRAME_PANIC);
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            memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
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//          memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
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            memcopy((__address) &src_ptl0[KAS_START_INDEX], (__address) &dst_ptl0[KAS_START_INDEX], KAS_INDICES*sizeof(pte_t));
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//          memcopy((__address) &src_ptl0[KAS_START_INDEX], (__address) &dst_ptl0[KAS_START_INDEX], KAS_INDICES*sizeof(pte_t));
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            memcopy(PA2KA((__address) GET_PTL0_ADDRESS()), (__address) dst_ptl0, PAGE_SIZE);
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            m->ptl0 = (pte_t *) KA2PA(dst_ptl0);
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            m->ptl0 = (pte_t *) KA2PA((__address) dst_ptl0);
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        }
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        }
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    }
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    }
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    return m;
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    return m;
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}
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}