AMD64 port

[Simon 'corecode' Schubert]

Matthew Dillon wrote:
:Of course they do not have to correspond, but they should reflect something people can understand.  I do not understand why amd64 bits should be living under "pc32", really.
    They wouldn't.  There would be a platform/pc64 for the amd 64 bits
    and a cpu/amd64 or cpu/x86_64 or whatever (I don't know the right name)
    for the cpu-specific bits.
    platform/pc32 and cpu/i386 are hardwired for 32 bit everything,
    particularly the pmap code.  We would never want to try to
    conditionalize it for 32 or 64 bit opration.
however, most of the platform code is the same for "pc64" and "pc32".  So we need something to share this, modulo the pmap code etc.

    The platforms are named differently from the architectures to avoid 
    the confusion that e.g. FreeBSD has when both platforms AND arcihtectures
    are named the same.  I don't want to call 'pc32' 'i386' when 'i386' is
    also the name of the cpu architecture.
Yah, that is a noble goal, but still it confuses people even more :/

cheers
 simon
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