64 bit Assembly introduction

I am looking for an articles which introduce Intel 64 bit processor and Assembly: list of x64 registers, commands syntax etc. fo开发者_高级运维r programmers familiar with 32 bit Assembly. Kind of "What's new" for 64 bit processor.

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The Intel 64 and IA-32 Architectures Software Developer's Manuals have everything you need.

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http://www.codeproject.com/KB/vista/vista_x64.aspx

http://msdn.microsoft.com/en-us/library/ms235286%28VS.80%29.aspx

What are the calling conventions for UNIX & Linux system calls on x86-64