On Sat, May 16, 2009 at 6:33 PM, SandeepKsinha <sandeepksinha@xxxxxxxxx> wrote: > Hi Arun, > > On Sat, May 16, 2009 at 5:48 PM, arun c <arun.edarath@xxxxxxxxx> 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. > Sorry, I spoke too early. Its prototype is same. > >> Regards, >> Arun C >> >> -- >> To unsubscribe from this list: send an email with >> "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx >> Please read the FAQ at http://kernelnewbies.org/FAQ >> >> > > > > -- > Regards, > Sandeep. > > > > > > > “To learn is to change. Education is a process that changes the learner.” > -- Regards, Sandeep. “To learn is to change. Education is a process that changes the learner.” -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
