Date: Tue, 31 Jul 2012 12:08:21 -0400 From: John Baldwin <jhb@freebsd.org> To: Venkat Duvvuru <venkatduvvuru.ml@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: PCI BAR mmap Message-ID: <201207311208.21178.jhb@freebsd.org> In-Reply-To: <CAGdae7aw0M_BNy2ozbPhznC7vuw-5%2BbxqJVx%2BJBnhzG4TnKsYg@mail.gmail.com> References: <CAGdae7a0xuKnFaeOTUykLcUKuCf17TTuYD_MuG4t7FKbHNoqAg@mail.gmail.com> <201207310951.12251.jhb@freebsd.org> <CAGdae7aw0M_BNy2ozbPhznC7vuw-5%2BbxqJVx%2BJBnhzG4TnKsYg@mail.gmail.com>
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On Tuesday, July 31, 2012 11:22:25 am Venkat Duvvuru 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. No, we do not currently have a generic way to mmap PCI BARs. > /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 > > > -- John Baldwin
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