--- David Stroupe <dstroupe@keyed-upsoftware.com> wrote: > I am developing a framegrabber driver. I need to map memory for > the > grabber to DMA the images into. I have it working currently where > the > grab happens into kernel memory and then I copy_to_user to get the > buffer into user space. I think I can eliminate this step by using > > remap_page_range which would allow me to access the grabbed images > directly from user space. The argument to remap_page_range that I > don't > understand is the first argument...the virtual address. I know how > big > the buffer is, I know the physical address of the buffer allocated > in > the kernel, I have to set the protection such that the pages are > not > swapped...how do I get a virtual address to pass to the driver so > that > this mapping can take place? > __va() will work, but only with low memory addresses. See http://www.xml.com/ldd/chapter/book/ch13.html#t1 Best of luck, ;-) --Christine __________________________________________________ Do You Yahoo!? Yahoo! Shopping - Mother's Day is May 12th! http://shopping.yahoo.com -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
