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    ASSERT(size <= 4*1024*1024);
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    ASSERT(size <= 4*1024*1024);
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    if (size <= FRAME_SIZE)
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    if (size <= FRAME_SIZE)
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        order = 0;
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        order = 0;
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    else
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    else
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        order = (fnzb32(size - 1) + 1) - FRAME_WIDTH;
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        order = (fnzb64(size - 1) + 1) - FRAME_WIDTH;
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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().