PCI BAR mmap

John Baldwin jhb at freebsd.org
Tue Jul 31 14:56:53 UTC 2012


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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