Date: Tue, 29 Jun 2004 10:08:48 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: tobe_better@hotmail.com Cc: freebsd-hackers@freebsd.org Subject: Re: PCI memory alloc..! Message-ID: <20040629.100848.48201340.imp@bsdimp.com> In-Reply-To: <BAY22-F21n8P5o7P6um0003a4ff@hotmail.com> References: <BAY22-F21n8P5o7P6um0003a4ff@hotmail.com>
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In message: <BAY22-F21n8P5o7P6um0003a4ff@hotmail.com>
"Auge Mike" <tobe_better@hotmail.com> writes:
: While I was trying to track to find out how a device alloc a new memory
: resource, I have been little confused on finding out how the new PCI device
: can deal with a case when the activation calls pmap_mapdev????
:
: What I need to understand that what will happen if pmap_mapdev allocated a
: new space that dose not match what is expected by the device and determined
: by r_start and r_end ??
The pci bus deals with allocating and mapping the memory. Getting the
bus handle and bus tags will let you access it via the bus_space
routines or the bus_dma routines. pmap_mamdev is done under the
covers and you'll not need to worry about such things.
Warner
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