Hi Arun, On Sat, May 16, 2009 at 5:48 PM, arun c <[email protected]> wrote: > Hi all, > > I want to copy data from user space to PCI memory. > > I mapped the PCI memory of the card by, > > 1)pci_request_regions(pci_dev, DEVICE_NAME); > 2)buffer_addr = pci_iomap(pci_dev, 1, 1024); > > Now I want to write data supplied by the > user to buffer_addr(BAR1 pre-fetch-able memory > of the device) > > I did like this: > > copy_from_user(buffer_addr, usr_addr, 1024) > > This method is working fine on an X86 running > linux 2.6.27 kernel. I can see the data clearly copied. > > I want to know is this legal for all the platforms? and for > older kernels starting from 2.6.16? > > If the above method is totally legal then can I use > copy_to_user(usr_addr, buffer_addr, 1024) also? > AFAIK, yes. If you look at the source, the code for copy_from_user/copy_to_user belongs to the arch directory which according to the semantics means that its platform specific. Also, I could see that its defined for all the platforms but its prototype differs.
> Regards, > Arun C > > -- > To unsubscribe from this list: send an email with > "unsubscribe kernelnewbies" to [email protected] > Please read the FAQ at http://kernelnewbies.org/FAQ > > -- Regards, Sandeep. “To learn is to change. Education is a process that changes the learner.” -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to [email protected] Please read the FAQ at http://kernelnewbies.org/FAQ
