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From: John Baldwin <jhb@freebsd.org>
To: Adrian Chadd <adrian@freebsd.org>
Date: Tue, 31 Jul 2012 12:22:55 -0400
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	(bigwig.baldwin.cx); Tue, 31 Jul 2012 12:23:25 -0400 (EDT)
Cc: freebsd-net@freebsd.org, Venkat Duvvuru <venkatduvvuru.ml@gmail.com>
Subject: Re: PCI BAR mmap
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On Tuesday, July 31, 2012 12:14:41 pm Adrian Chadd wrote:
> On 31 July 2012 08:22, Venkat Duvvuru <venkatduvvuru.ml@gmail.com> wrote:
> > Hi John,
> > Thanks for your response.
> > Is there an alternative to mmap the PCI BARs, I mean without implementing
> > an mmap method in the driver, something like a pci subsystem mmap in 
Linux.
> > Linux allows to mmap PCI BARs without any change in the device driver.
> 
> I guess someone could implement a sysctl API to access PCI BAR
> registers, rather than mapping /dev/pci or however pciconf -r works.
> 
> That way you'd implement it once and all devices would have their BAR
> registers show up in a userland-friendly way.

Eh, no sysctl.  /dev/pci uses ioctls.  However, having a generic way to mmap 
BARs may be useful.

-- 
John Baldwin