Re: How to map PCI memory to user space ?

[Michael <macallan%netbsd.org@localhost>]

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Hello,

On Dec 10, 2012, at 8:51 PM, Rohan Akela wrote:

> I am trying to map PCI device memory  using mmap()  to user space for
> powerpc based platform.

I assume this means macppc?
If not you probably need options INSECURE in your kernel.

> I came across previous email thread where it
> is mentioned that it is possible to mmap PCI memory using pcimmap()
> implemented in dev/pci/pci_usrreq.c.
>
> I wrote a small application to map the the PCI memory but mmap()
> always return "invalid argument". The example is given below.

Are you running it as root or as an unprivileged user?

> Does mmap() using pcimmap() works?

Yes, that's what the Xserver uses. If X works with a driver other than  
wsfb then so should your code.

> Is there a sample code that illustrates how to map PCI memory using  
> mmap(). ?

xsrc/external/mit/libpciaccess/dist/src/netbsd_pci.c

have fun
Michael

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