On Wed, Feb 22, 2012 at 2:15 PM, Ian Lepore <[email protected]> wrote: > I've never done this, but if I needed to, I think the first thing I'd > try is to use an mmap(2) of /dev/kmem to map the memory you need into > userspace (of course your userspace app will need to be running with > root privs to do this). > > That leaves the interesting problem of locating what offset within the > kernel virtual address space you need to map to get at your data. Two > things come to mind... have your kernel module export the address in a > sysctl (that feels kind of hack-ish but it should be quick and easy to > do), or use libkvm's kvm_nlist() function to locate the symbol within > your module (I think that should be possible; again I've never actually > done any of this).
A far easier way to do this is to have the module create its own device in /dev that exports the memory by implementing the mmap interface in the cdev. _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
