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If we're mapping something in the "legacy range" (0-1Mb), we shouldn't expand the requested range to the entire 0-1Mb range. Typically this is for mapping the VGA frame buffer, and some platforms support mmap of the frame buffer but not the entire 0-1Mb range. For example, HP sx1000 and sx2000 ia64 platforms can have memory from 0-0x9ffff, VGA frame buffer from 0xa0000-0xbffff, and memory from 0xc0000-0xfffff. On these platforms, we can't map the entire 0-1Mb range with the same attribute because the memory only supports WB, while the frame buffer supports only UC. But an mmap of just the frame buffer should work fine.