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Re: 64 bit addressing again

On Feb 11, 2004, at 2:57 AM, Andreas Lachner wrote:

On Tuesday, Sep 16, 2003, at 15:50 US/Eastern, Mike Vannorsdel wrote:

Did anyone see the "Optimizing for the PowerMac G5" article today. It
says:

"Today, Mac OS X provides full 64-bit support in the kernel, the
virtual memory subsystem, the file system, and some additional core
components of the OS."

This seems to imply 64-bit addressing is already there. However, from
discussions in here it seems it's not implemented.

My real question is, does anyone know the lowdown on this; does Mac OS
X currently allow 64-bit addressing and if so, where can one find the
documentation to implement it (allocation functions, compiler flags,
ect.)?

There was an answer: no 64-bit addressing support.

To be clear no 64-bit virtual addressing for user tasks or the kernel at this time however the the VM system and IO system (DMA) can handle more then just 4GB of physical RAM.

Did it change meanwhile?

Nothing announced by Apple other then they plan to provide it someday and no dates provided. Apple doesn't normally announce products/features until they are [near] ready or wait to announce such things at WWDC (http://developer.apple.com/wwdc/index.html).

How can I address 8 GB of ram at all?

One way is to use multiple processes/tasks. On one of the darwin lists a few months back a few folks (including Apple folks) hashed out how to do this, I cannot recall which list at the moment.

-Shawn
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 >64 bit addressing again (From: Andreas Lachner <email@hidden>)



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