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Date: Fri, 12 May 2006 20:32:54 -0400 (EDT)
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To: hongz@promisechina.com
From: "M. Warner Losh" <imp@bsdimp.com>
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References: <1147340690$36076$55833599@hongz@promisechina.com>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: help:How to map a physical address into a kernel address?
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In message: <1147340690$36076$55833599@hongz@promisechina.com>
            <hongz@promisechina.com> writes:
: To access sg_table in kernel address, I need to map the starting physical
: address of a segment into a kernel address. As I know that, we can use
: phystovirt()/bustovirt(), or kmap()/kmap_atomic() to map a bus/physical
: address or a physical page into a kernel address in Linux, but I did not
: find such a function in FreeBSD. Please help me on this, it is very urgent!

Use busdma.

Warner