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, 10 insertions, 1 deletions

diff --git a/sys/i386/include/tss.h b/sys/i386/include/tss.h
index 565defab8cb7..636133a9a870 100644
--- a/sys/i386/include/tss.h
+++ b/sys/i386/include/tss.h
@@ -34,12 +34,14 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)tss.h	5.4 (Berkeley) 1/18/91
- *	$Id$
+ *	$Id: tss.h,v 1.8 1997/02/22 09:35:20 peter Exp $
  */
 
 #ifndef _MACHINE_TSS_H_
 #define _MACHINE_TSS_H_ 1
 
+#include <machine/globals.h>
+
 /*
  * Intel 386 Context Data Type
  */
@@ -79,4 +81,11 @@ struct i386tss {
 	int	tss_ioopt;	/* options & io offset bitmap: currently zero */
 				/* XXX unimplemented .. i/o permission bitmap */
 };
+
+#ifdef KERNEL
+#ifndef common_tss
+extern struct i386tss common_tss;
+#endif
+#endif
+
 #endif /* _MACHINE_TSS_H_ */