Messages in this thread |  | | | From | (Alan Cox) | | Subject | Re: User mode Virt -> Phys | | Date | Tue, 12 Jan 1999 17:23:21 +0000 (GMT) |
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> On Tue, Jan 12, 1999 at 12:54:45AM +0000, Alan Cox wrote: > > > The linux kernel is full of calls to virt_to_phys. This function seems > > > only to work in kernel mode. Is there a way to convert a physical address > > > to a virtual address in user mode (from a regular program)? > > > > No. Nor should there ever need to be. > > Yes, for user level I/O stuff doing PCI DMA. Not normal applications by > any means, and you'd better know what you're doing. > > I have code which implements this quite cleanly (as this sort of thing > goes), but I haven't released it yet and won't until I am ready.
You still don't need to do that translation for user space. Have a look at Stephen Tweedie <sct@redhat.com>'s raw-io patches and DMA hooks in kernel space for handling this stuff
Alan
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