Re: Pure 64 bootloaders

[Lennart Sorensen]

On Tue, Sep 13, 2005 at 11:44:55PM -0400, Kyle Moffett wrote:
> PowerPC was designed 64-bit from the start too!  It's just that the  
> architecture design group also realized that there would be a demand  
> for 32-bit CPUs, and so from the _64-bit_ system, they designed a 32- 
> bit system whose entire instruction set would be forward-compatible  
> to 64-bit systems when they came out.  That's why 32-bit PowerPC  
> machine code and 64-bit PowerPC machine code are completely identical  
> except that 64-bit CPUs also have a few opcodes to process 64-bit  
> data and a few extra kernel-mode registers.

Hmm, so how does that fit with needing both 32 and 64bit libraries on a
ppc system?  It seems apple forgot the 64bit part of a library recently
in a security fix, or is that something more to do with their os than
the cpu?

Len Sorensen
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