Enable vmspace sharing on SMP. Major changes are,

- %fs register is added to trapframe and saved/restored upon kernel entry/exit.
- Per-cpu pages are no longer mapped at the same virtual address.
- Each cpu now has a separate gdt selector table. A new segment selector
  is added to point to per-cpu pages, per-cpu global variables are now
  accessed through this new selector (%fs). The selectors in gdt table are
  rearranged for cache line optimization.
- fask_vfork is now on as default for both UP and SMP.
- Some aio code cleanup.

Reviewed by:	Alan Cox	<alc@cs.rice.edu>
		John Dyson	<dyson@iquest.net>
		Julian Elischer	<julian@whistel.com>
		Bruce Evans	<bde@zeta.org.au>
		David Greenman	<dg@root.com>

1 files changed, 3 insertions, 8 deletions

diff --git a/sys/kern/subr_trap.c b/sys/kern/subr_trap.c
index d08306e..c0807b0 100644
--- a/sys/kern/subr_trap.c
+++ b/sys/kern/subr_trap.c
@@ -35,7 +35,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)trap.c	7.4 (Berkeley) 5/13/91
- *	$Id: trap.c,v 1.134 1999/03/09 20:20:09 phk Exp $
+ *	$Id: trap.c,v 1.135 1999/04/19 14:14:13 peter Exp $
  */
 
 /*
@@ -101,8 +101,6 @@
 #include "isa.h"
 #include "npx.h"
 
-extern struct i386tss common_tss;
-
 int (*pmath_emulate) __P((struct trapframe *));
 
 extern void trap __P((struct trapframe frame));
@@ -480,11 +478,6 @@ kernel_trap:
 				 * (XXX) so that we can continue, and generate
 				 * a signal.
 				 */
-				if (frame.tf_eip == (int)cpu_switch_load_fs) {
-					curpcb->pcb_fs = 0;
-					psignal(p, SIGBUS);
-					return;
-				}
 				if (frame.tf_eip == (int)cpu_switch_load_gs) {
 					curpcb->pcb_gs = 0;
 					psignal(p, SIGBUS);
@@ -496,6 +489,8 @@ kernel_trap:
 						   doreti_popl_ds_fault);
 				MAYBE_DORETI_FAULT(doreti_popl_es,
 						   doreti_popl_es_fault);
+				MAYBE_DORETI_FAULT(doreti_popl_fs,
+						   doreti_popl_fs_fault);
 				if (curpcb && curpcb->pcb_onfault) {
 					frame.tf_eip = (int)curpcb->pcb_onfault;
 					return;