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Rev 1903 Rev 1917
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        { PAGESIZE_64K, 8*PAGE_SIZE, 4 },   /* 256K */
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        { PAGESIZE_64K, 8*PAGE_SIZE, 4 },   /* 256K */
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        { PAGESIZE_512K, 0, 1 },        /* 512K */
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        { PAGESIZE_512K, 0, 1 },        /* 512K */
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        { PAGESIZE_512K, 64*PAGE_SIZE, 2 }, /* 1M */
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        { PAGESIZE_512K, 64*PAGE_SIZE, 2 }, /* 1M */
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        { PAGESIZE_512K, 64*PAGE_SIZE, 4 }, /* 2M */
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        { PAGESIZE_512K, 64*PAGE_SIZE, 4 }, /* 2M */
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        { PAGESIZE_4M, 0, 1 }           /* 4M */
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        { PAGESIZE_4M, 0, 1 }           /* 4M */
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        { PAGESIZE_4M, 512*PAGE_SIZE, 2 }   /* 8M */
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    };
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    };
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    ASSERT(ALIGN_UP(physaddr, PAGE_SIZE) == physaddr);
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    ASSERT(ALIGN_UP(physaddr, PAGE_SIZE) == physaddr);
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    ASSERT(size <= 4*1024*1024);
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    ASSERT(size <= 8*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 = (fnzb64(size - 1) + 1) - FRAME_WIDTH;
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        order = (fnzb64(size - 1) + 1) - FRAME_WIDTH;