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In protected mode are there reserved areas not to be used for another processes. For example Im using lfb pointer for screen drawings. I wonder if using video bios area(0xa0000-0xc0000) for another processes cause error, or is there a problem if I use the rom area(0xc0000-0xfffff)?

physical memory mappings to ROM or devices (such as video memory) remains in pmode. You may not include those areas in your process' address space by not paging them, though.