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, 5 insertions, 3 deletions

diff --git a/sys/amd64/include/pcb.h b/sys/amd64/include/pcb.h
index d76217f..9ab0856 100644
--- a/sys/amd64/include/pcb.h
+++ b/sys/amd64/include/pcb.h
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)pcb.h	5.10 (Berkeley) 5/12/91
- *	$Id: pcb.h,v 1.25 1997/10/10 12:40:09 peter Exp $
+ *	$Id: pcb.h,v 1.26 1998/02/03 21:27:50 bde Exp $
  */
 
 #ifndef _I386_PCB_H_
@@ -43,6 +43,7 @@
 /*
  * Intel 386 process control block
  */
+#include <machine/globals.h>
 #include <machine/npx.h>
 
 struct pcb {
@@ -64,14 +65,13 @@ struct pcb {
 #else
 	u_long	pcb_mpnest_dontuse;
 #endif
-	int	pcb_fs;
 	int	pcb_gs;
 #ifdef VM86
 	struct	pcb_ext	*pcb_ext;	/* optional pcb extension */
 #else
 	struct	pcb_ext	*pcb_ext_dontuse;
 #endif
-	u_long	__pcb_spare[1];	/* adjust to avoid core dump size changes */
+	u_long	__pcb_spare[2];	/* adjust to avoid core dump size changes */
 };
 
 /*
@@ -83,7 +83,9 @@ struct md_coredump {
 
 #ifdef KERNEL
 
+#ifndef curpcb
 extern struct pcb *curpcb;		/* our current running pcb */
+#endif
 
 void	savectx __P((struct pcb *));
 #endif