Subject: Re: Risc 6000 Power3-II support
To: Jochen Kunz <jkunz@unixag-kl.fh-kl.de>
From: David Edelsohn <dje@watson.ibm.com>
List: port-powerpc
Date: 04/08/2003 17:55:52
>>>>> Jochen Kunz writes:
Jochen> Aha, interresting. Do we have 64 bit PowerPC support beside running a 64
Jochen> bit PowerPC CPU in 32 bit compatibility mode? (If there is such a mode?)
64-bit PowerPC can run in 32-bit mode or 64-bit mode for the OS
and 64-bit mode or 32-bit mode for the applications. A 32-bit OS can run
64-bit applications and vice-versa. One needs a minimal amount of 64-bit
assembly code to manipulate the 64-bit memory management and machine
status registers, but one otherwise can run a 32-bit OS. In other words,
the OS must be 64-bit aware, but need not run in 64-bit mode.
David