I changed the CC to recipients appropriate for Hurd discussion. Yes, I've decided what to do. In fact, I should do it already.
It's already specified that the "thread register" is one word at %gs:0. We can implement this now with a per-thread LDT using the existing Mach interfaces, but I think that is overkill. What I'm going to do is change the standard user-mode %gs to a new special global segment that will point to one word in user-writable memory above VM_MAX_ADDRESS. (The segmentation limits on the other user-usable segments prevent any other way of writing to that page.) For SMP, there will be a USER_GS segment on each CPU pointing to different locations. Then thread switching will switch this word as if it were a register. _______________________________________________ Bug-hurd mailing list [EMAIL PROTECTED] http://mail.gnu.org/mailman/listinfo/bug-hurd
