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Date:      Tue, 02 Jun 1998 06:43:05 -0500
From:      "Chris Csanady" <cc@swing.ca.sandia.gov>
To:        freebsd-hackers@FreeBSD.ORG
Subject:   VM Questions
Message-ID:  <199806021143.GAA12205@swing.ca.sandia.gov>

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Hello, I am working on implementing a low level message passing
protocol for FreeBSD, although I have a few questions.

First, I was wondering if it is possible given a physical address,
to copy data to it from a virtual address.  Or is a virtual mapping
necessary?

The other question is how may I map user pages into the kernel?  I've
looked through vm_map.c, and it seems that support for this is
lacking.  To get around this for now, I am attempting to use almost
exclusively physical address--although am now sure how it will work
out.

Thanks,
Chris Csanady




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