Messages in this thread | | | Subject | Re: [linux-fbdev] Re: request_region for MMIO? | From | Jes Sorensen <> | Date | 01 Feb 1999 15:19:35 +0100 |
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>>>>> "Geert" == Geert Uytterhoeven <Geert.Uytterhoeven@cs.kuleuven.ac.be> writes:
Geert> On 1 Feb 1999, Jes Sorensen wrote: >> Oh did I get you wrong here, do you mean PCI I/O registers that >> just happen to be mem mapped on non x86 architectures or do you >> actually mean PCI shared memory type registers?
Geert> I mean anything I can map with ioremap(). Before I map it, I Geert> have to make sure it's not yet in use by a(nother) driver. For Geert> I/O ports, we have request_region() for that purpose.
Oh, in that case there is currently no method afaik. Point here is that nobody really has any way of guaranteeing who owns what - ie. you can have the case (and you often will) that a user space application wants to mmap() registers while the kernel uses them, like we have with gfx.
Jes
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