Author: Jeremiah Penery
Date: 18:44:36 09/24/03
Go up one level in this thread
On September 24, 2003 at 20:01:10, Robert Hyatt wrote: >On September 24, 2003 at 18:41:59, Jeremiah Penery wrote: > >>On September 24, 2003 at 12:01:01, Robert Hyatt wrote: >> >>>On September 23, 2003 at 18:23:20, Jeremiah Penery wrote: >>> >>>>On September 23, 2003 at 17:27:48, Slater Wold wrote: >>>> >>>>>As soon as they have a 64-bit Opteron compiler (publicly available), I'll let >>>>>you know. ;) >>>> >>>>GCC already does. >>> >>> >>>You also need a 64 bit operating system, >> >>SuSE Linux has had an x86-64 version for a while. I guess there are a couple of >>other now too. >> >> or else some assembly hacking. And >>>then you have to get the compiler to produce a 64 bit code that will run on >>>the 32 bit O/S. >> >>Huh? > > >The opteron is an odd bird. If it isn't initialized to 64 bit mode, you can't >get to the extra 64 bit registers. A user mode program can't do that easily, >although I am sure it is possible with access to kernel mode and some inline >assembly. From what I understand, it is not at all possible unless the OS is 64-bit. If the CPU is booted in 32-bit mode, it is impossible to then run anything in 64-bit mode.
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