Date: Tue, 31 Jul 2012 20:52:25 +0530 From: Venkat Duvvuru <venkatduvvuru.ml@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: PCI BAR mmap Message-ID: <CAGdae7aw0M_BNy2ozbPhznC7vuw-5%2BbxqJVx%2BJBnhzG4TnKsYg@mail.gmail.com> In-Reply-To: <201207310951.12251.jhb@freebsd.org> References: <CAGdae7a0xuKnFaeOTUykLcUKuCf17TTuYD_MuG4t7FKbHNoqAg@mail.gmail.com> <201207310951.12251.jhb@freebsd.org>
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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 >
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