[socillion]

I recommend Computer Systems: A Programmer's Perspective. It sounds like what you're looking for, although it uses a mix of C and IA32.

[thinkpad20]

I came in here to say just this! A fantastic book in so many ways. I read a lot of it on my own and learned more than in many of my classes on similar subjects. It taught me a huge amount about C, systems, architecture, memory and more. Very cool stuff. It starts with x86 but goes over at least the basic differences between it and x64.