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Date: Tue, 31 Jul 2012 20:52:25 +0530
Message-ID: <CAGdae7aw0M_BNy2ozbPhznC7vuw-5+bxqJVx+JBnhzG4TnKsYg@mail.gmail.com>
From: Venkat Duvvuru <venkatduvvuru.ml@gmail.com>
To: John Baldwin <jhb@freebsd.org>
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Subject: Re: PCI BAR mmap
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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.

/Venkat

On Tue, Jul 31, 2012 at 7:21 PM, John Baldwin <jhb@freebsd.org> wrote:

>  On Tuesday, July 31, 2012 8:48:00 am Venkat Duvvuru wrote:
> > Hi,
> > How to mmap PCI  BARs from userland in freebsd?
> > In Linux the PCI BAR appears as a file in the sysfs file system. How can
> I
> > access PCI BAR as a file in freebsd to mmap it?
>
> You can export a BAR via a d_mmap() method from a cdevsw device you create
> in
> your driver.
>
> --
> John Baldwin
>