> On Tue, Jun 14, 2005 at 04:21:41AM -0400, Aziz Kezzou wrote: > > > > 1 - Right now to access the memory address space of a user process > > from kernel mode, I only have to set, on x86 systems, the register CR3 > > to the right value. How can I do that on other architectures ? is > > there an architecture-independant way of doing that ? > > Addition to the previous answer. It is also possible to temporally > map several pages of user memory into the kernel address space. > Check pmap_qenter(9) and see physio -> vmapbuf, for example, how to > use it. Another method, it is possible to COW a single user page and > then use it in the kernel, but with this method an user process will > not see any modification in this page made by the kernel and vice > versa. Check socow_setup -> vm_page_cowsetup, for example, how to > use it.
Very interesting ! Right now I am using the fact that the kernel address space is maped on i386 machines into the user address space. So when I am executing a system call I can access kernel memory. I am wondering if there is an architecture-independant way of doing that ? (Notice that I need not only read kernel memory but also free it. e.g, mbufs ) or at least could you tell me if that's possible on other architectures ? Thanks for your help, -aziz _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
