Messages in this thread | | | From | Jesse Barnes <> | Subject | Re: [PATCH] add legacy I/O and memory access routines to /proc/bus/pci API | Date | Thu, 16 Dec 2004 08:26:31 -0800 |
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On Thursday, December 16, 2004 6:55 am, Benjamin Herrenschmidt wrote: > On Wed, 2004-12-15 at 09:00 -0800, Jesse Barnes wrote: > > Good, because that's exactly what it does. The arch is responsible for > > returning the legacy I/O port or legacy ISA memory base address given a > > pci_dev, which is used as a base for the page offset passed into mmap. > > So e.g. mmap(..., 0xa0000) after doing ioctl(fd, > > PCIIOC_MMAP_IS_LEGACY_MEM, ...) would get you the VGA framebuffer for the > > device corresponding to 'fd'. > > Sounds good... The only thing is a pci_dev may not be available if you > have a PCI->ISA bridge, tho you may just use the pci_dev of the > bridge...
Well, you'll have to have a fake one at least. Remember the fds used in the above example come from fd = open("/proc/bus/pci/BB/SS.F", O_RDWR)...
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