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Re: Linear address mapping

To: "John R Pierce" <pierce@scruznet.com>
Subject: Re: Linear address mapping
From: Stephen Williams <steve@icarus.com>
Date: Fri, 27 Sep 1996 10:01:10 -0700
Cc: Mailing List Recipients <pci-sig-request@znyx.com>
In-Reply-To: Your message of "Fri, 27 Sep 1996 02:15:29 PDT." <199609270925.CAA03995@scruz.net>


pierce@scruznet.com said:
> if your device is intended to operate in a virtual memory environment 
> (windows, NT, *nix, OS/2), then it will either have to use small 
> static DMA buffers or it will have to support "scatter/gather". 

In Linux, you do not need to go through all of this. Memory allocated
in kernel mode maps 1-to-1 to physical, so there is no problem. I've
written Linux drivers for devices with pretty large DMA transfers.

-- 
Steve Williams
steve@icarus.com
steve@picturel.com

"The woods are lovely, dark and deep.  But I have promises to keep,
And lines to code before I sleep, And lines to code before I sleep."

=ÔÁ

References:
- Re: Linear address mapping
  - From: "John R Pierce" <pierce@scruznet.com>

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