diff --git a/sys/arch/i386/i386/machdep.c b/sys/arch/i386/i386/machdep.c
index 97e3321796d2..0393613efdfa 100644
--- a/sys/arch/i386/i386/machdep.c
+++ b/sys/arch/i386/i386/machdep.c
@@ -44,7 +44,7 @@
  * 15 Aug 92    William Jolitz          Large memory bug
  * 15 Aug 92	Terry Lambert		Fixed CMOS RAM size bug
  */
-static char rcsid[] = "$Header: /cvsroot/src/sys/arch/i386/i386/machdep.c,v 1.10 1993/05/13 21:39:36 deraadt Exp $";
+static char rcsid[] = "$Header: /cvsroot/src/sys/arch/i386/i386/machdep.c,v 1.11 1993/05/16 03:42:46 cgd Exp $";
 
 #include "param.h"
 #include "systm.h"
@@ -959,6 +959,10 @@ init386(first)
 	proc0.p_addr->u_pcb.pcb_tss.tss_esp0 = (int) kstack + UPAGES*NBPG;
 	proc0.p_addr->u_pcb.pcb_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ;
 	_gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
+
+	((struct i386tss *)gdt_segs[GPROC0_SEL].ssd_base)->tss_ioopt = 
+		(sizeof(tss))<<16;
+
 	ltr(_gsel_tss);
 
 	/* make a call gate to reenter kernel with */
diff --git a/sys/arch/i386/i386/mem.c b/sys/arch/i386/i386/mem.c
index 650e21eb509c..72232ad07d3b 100644
--- a/sys/arch/i386/i386/mem.c
+++ b/sys/arch/i386/i386/mem.c
@@ -50,8 +50,10 @@
 #include "systm.h"
 #include "uio.h"
 #include "malloc.h"
+#include "proc.h"
 
 #include "machine/cpu.h"
+#include "machine/psl.h"
 
 #include "vm/vm_param.h"
 #include "vm/lock.h"
@@ -61,6 +63,42 @@
 
 extern        char *vmmap;            /* poor name! */
 /*ARGSUSED*/
+mmclose(dev, uio, flags)
+	dev_t dev;
+	struct uio *uio;
+	int flags;
+{
+	struct syscframe *fp;
+
+	switch (minor(dev)) {
+	case 14:
+		fp = (struct syscframe *)curproc->p_regs;
+		fp->sf_eflags &= ~PSL_IOPL;
+		break;
+	default:
+		break;
+	}
+	return(0);
+}
+/*ARGSUSED*/
+mmopen(dev, uio, flags)
+	dev_t dev;
+	struct uio *uio;
+	int flags;
+{
+	struct syscframe *fp;
+
+	switch (minor(dev)) {
+	case 14:
+		fp = (struct syscframe *)curproc->p_regs;
+		fp->sf_eflags |= PSL_IOPL;
+		break;
+	default:
+		break;
+	}
+	return(0);
+}
+/*ARGSUSED*/
 mmrw(dev, uio, flags)
 	dev_t dev;
 	struct uio *uio;