On Wed, 2010-02-17 at 19:29 +0200, Nameer Yarkon wrote: > On Wed, Feb 17, 2010 at 6:04 PM, Daniel Stone <[email protected]> wrote: > > What's your real question? i.e. what problem are you trying to solve? > > I'm trying to understand how user space can efficiently manipulate > physical memory, and I'm sure that X11 does that great. So this is > just a learning exercise for me about X11.. > > I know that it can be done via: > 1. mmap'ing /dev/mem > 2. creating a char device driver that allocates physical memory and > expose it via mmap() support
Those are the same thing; /dev/mem is a character device. > and now i understand it can also be done via sysfs ? The implementation for mmap on the sysfs resource files is largely the same as for mmap on /dev/mem. It has the benefit of only allowing you to access the memory corresponding to a particular BAR on the PCI device. ls /sys/bus/pci/devices/*/resource* - ajax
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