Mailing Lists: Apple Mailing Lists
Image of Mac OS face in stamp
 
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Zero-copy PXI-X driver for G5 Mac, process access to 7 GB memory

Josh de Cesare writes:
> Later the client will make a request that will start DMA to
> one of the memory chunks. The driver will look up the chunk in the
> control structures. It will then use one or more of the DMA windows
> and set their mappings with IOMapperInsertPPNPages and the previously
> collected physical page list. Then the driver can initiate the DMA
> activity. Obviously, the windows and mappings can not be reused

So this method is zero-copy, but not OS-bypass.. It may be helpful
for the original author, but its useless for me.

Does Apple plan to ever open source com.apple.driver.AppleMacRiscPCI
so we can see how the Dart actually works?

Drew
_______________________________________________
darwin-drivers mailing list | email@hidden
Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-drivers
Do not post admin requests to the list. They will be ignored.
References: 
 >Zero-copy PXI-X driver for G5 Mac, process access to 7 GB memory (From: "Miller, Larry" <email@hidden>)
 >Re: Zero-copy PXI-X driver for G5 Mac, process access to 7 GB memory (From: Andrew Gallatin <email@hidden>)
 >Re: Zero-copy PXI-X driver for G5 Mac, process access to 7 GB memory (From: Josh de Cesare <email@hidden>)



Visit the Apple Store online or at retail locations.
1-800-MY-APPLE

Contact Apple | Terms of Use | Privacy Policy

Copyright © 2007 Apple Inc. All rights reserved.