Doom has already been ported to the PSP here: http://psp-news.dcemu.co.uk/doompsp.shtml and you can use DOS via the Bochs x86 pc emu here: http://psp-news.dcemu.co.uk/bochspsp.shtml or the Dosbox emu here: http://psp-news.dcemu.co.uk/pspdosbox.shtml although they are very slow and don't have very good keyboard or mouse input. Other than that if the source code for a game isn't available then you can't create a port for it.
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