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    /*
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    /*
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     * Use virtual addresses that are beyond the limit of physical memory.
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     * Use virtual addresses that are beyond the limit of physical memory.
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     * Thus, the physical address space will not be wasted by holes created
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     * Thus, the physical address space will not be wasted by holes created
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     * by frame_alloc().
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     * by frame_alloc().
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     */
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     */
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    ASSERT(last_frame);
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    ASSERT(PA2KA(last_frame));
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    uintptr_t virtaddr = ALIGN_UP(last_frame, 1<<(order + FRAME_WIDTH));
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    uintptr_t virtaddr = ALIGN_UP(PA2KA(last_frame), 1 << (order + FRAME_WIDTH));
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    last_frame = ALIGN_UP(virtaddr + size, 1<<(order + FRAME_WIDTH));
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    last_frame = ALIGN_UP(KA2PA(virtaddr) + size, 1 << (order + FRAME_WIDTH));
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    for (i = 0; i < sizemap[order].count; i++) {
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    for (i = 0; i < sizemap[order].count; i++) {
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        /*
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        /*
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         * First, insert the mapping into DTLB.
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         * First, insert the mapping into DTLB.
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         */
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         */