seb at highlab.com
Wed Jun 25 13:08:01 PDT 2008
Hi folks, I'm from EMC2 (linuxcnc.org) by way of the linux-pci list,
I found my way here while chasing userspace libraries to do PCI access.
In the EMC2 project we have a home-grown library to access a PCI card's
BARs from userspace, and we recently started needing to access the Config
space too. I looked at pciutils' libpci, but it provides only Config
access, no BAR access. I started thinking about merging our BAR-only
library and the Config-only pciutils library, but before I got to coding,
Jesse Barnes pointed me at libpciaccess, which looks like it'll do what
I'd be using it on Linux 2.6.
pci_device_cfg_read() and _write() provides read/write access the Config
pci_device_map_range() can be used to mmap both memory and IO BARs,
is that true? And once mapped in with PCI_DEV_MAP_FLAG_WRITABLE it's
fully read/write (assuming you've got the permissions)?
I guess there are lots of users of libpciaccess on this list? How do
you find working with it?
"The brain is [a machine]. The fact that it's made out of meat is a
red herring." -- David Adler <http://www.spectrum.ieee.org/print/6268>
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