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Re: Mapping user buffers to kernel space

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Re: Mapping user buffers to kernel space

Subject: Re: Mapping user buffers to kernel space
From: Andrew Gallatin <email@hidden>
Date: Fri, 23 Apr 2010 16:15:53 -0400

Joe van Tunen wrote:

From: Ken Hornstein <email@hidden>

 - I know about the IOMemoryDescriptor calls, but from what I can see the
   way they work is that you have to allocate the buffer using them and
   then give that buffer to userspace.  I don't see how to use
   IOMemoryDescriptor on a struct uio.
--Ken
You’re user space code can tell your kext about a user space block of memory (make your own user space memory descriptor type) and the kext can map it into kernel address space.

You can also make memory descriptor using a uio: md = IOMemoryDescriptor::withOptions(iov, io_cnt, 0, task kIOMemoryTypeUIO | otheroptions )

Drew
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