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List:       freebsd-hackers
Subject:    Re: PCI memory alloc..!
From:       "M. Warner Losh" <imp () bsdimp ! com>
Date:       2004-06-29 16:08:48
Message-ID: 20040629.100848.48201340.imp () bsdimp ! 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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