Messages in this thread |  | | | Date | Sun, 23 Nov 2008 17:41:22 -0800 | | From | Greg KH <> | | Subject | Re: [PATCH RFC] UIO: Pass information about ioports to userspace |
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On Sun, Nov 23, 2008 at 01:14:20PM +0100, Hans J. Koch wrote: > Devices sometimes have memory where all or parts of it can not be mapped to > userspace. But it might still be possible to access this memory from > userspace by other means. An example are PCI cards that advertise not only > mappable memory but also ioport ranges. On x86 architectures, these can be > accessed with ioperm, iopl, inb, outb, and friends. Mike Frysinger (CCed) > reported a similar problem on Blackfin arch where it doesn't seem to be easy > to mmap non-cached memory but it can still be accessed from userspace. > > This patch allows kernel drivers to pass information about such ports to > userspace. Similar to the existing mem[] array, it adds a port[] array to > struct uio_info. Each port range is described by start, size, and porttype.
Looks good, but I think you also forgot the documentation update :)
thanks,
greg k-h
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