No, not Linus' version anyway.
> If not, what do we need to do in order to get it implemented? I would
> really like to see this system call become a standard feature of 2.2
> so that our code can work out of the box with Linux 2.2 systems.
It could be implemented as a device driver, with an ioctl to return a
region (or regions if you can do scatter-gather), and their bus
addresses. I know this is possible, I have a custom network driver that
does something similar (returning a DMA buffer to user space), though
the bus address remains known only to the device driver in this case.
That would be possible in 2.2, if it is a completely separate device.
Ooh, I'm getting some thoughts now...
How about a generic user-space I/O device, that can take bulk mixed I/O
and DMA requests, provide user space DMA buffers (flagging them as
non-DMA if the operation would require bounce buffers), and can register
a bulk request for when the device is closed, for cleaning up a video
device to name but one example.. {:-)}
In other words a little language interpreter for I/O operations.
-- Jamie
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