From 36428e610081ea618b57df0eae872ab20e632165 Mon Sep 17 00:00:00 2001
From: Peter Wemm <peter@FreeBSD.org>
Date: Wed, 7 May 1997 20:02:38 +0000
Subject: [PATCH] simplify IOPL gain/remove privs code.  It's easier with
 md_regs being a trapframe.

---
 sys/amd64/amd64/mem.c     | 11 +++--------
 sys/dev/syscons/syscons.c |  9 +++------
 sys/i386/i386/mem.c       | 11 +++--------
 sys/i386/isa/spigot.c     |  7 ++-----
 sys/i386/isa/syscons.c    |  9 +++------
 sys/isa/syscons.c         |  9 +++------
 6 files changed, 17 insertions(+), 39 deletions(-)

diff --git a/sys/amd64/amd64/mem.c b/sys/amd64/amd64/mem.c
index 9fb1525a6930..bfe5bfff7017 100644
--- a/sys/amd64/amd64/mem.c
+++ b/sys/amd64/amd64/mem.c
@@ -38,7 +38,7 @@
  *
  *	from: Utah $Hdr: mem.c 1.13 89/10/08$
  *	from: @(#)mem.c	7.2 (Berkeley) 5/9/91
- *	$Id: mem.c,v 1.41 1997/02/22 09:32:33 peter Exp $
+ *	$Id: mem.c,v 1.42 1997/04/14 15:54:26 bde Exp $
  */
 
 /*
@@ -145,16 +145,13 @@ mmclose(dev, flags, fmt, p)
 	int fmt;
 	struct proc *p;
 {
-	struct trapframe *fp;
-
 	switch (minor(dev)) {
 #ifdef PERFMON
 	case 32:
 		return perfmon_close(dev, flags, fmt, p);
 #endif
 	case 14:
-		fp = (struct trapframe *)curproc->p_md.md_regs;
-		fp->tf_eflags &= ~PSL_IOPL;
+		curproc->p_md.md_regs->tf_eflags &= ~PSL_IOPL;
 		break;
 	default:
 		break;
@@ -170,7 +167,6 @@ mmopen(dev, flags, fmt, p)
 	struct proc *p;
 {
 	int error;
-	struct trapframe *fp;
 
 	switch (minor(dev)) {
 	case 32:
@@ -185,8 +181,7 @@ mmopen(dev, flags, fmt, p)
 			return (error);
 		if (securelevel > 0)
 			return (EPERM);
-		fp = (struct trapframe *)curproc->p_md.md_regs;
-		fp->tf_eflags |= PSL_IOPL;
+		curproc->p_md.md_regs->tf_eflags |= PSL_IOPL;
 		break;
 	default:
 		break;
diff --git a/sys/dev/syscons/syscons.c b/sys/dev/syscons/syscons.c
index 641da111d6d5..ae7b43282852 100644
--- a/sys/dev/syscons/syscons.c
+++ b/sys/dev/syscons/syscons.c
@@ -25,7 +25,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *  $Id: syscons.c,v 1.213 1997/04/30 15:31:22 ache Exp $
+ *  $Id: syscons.c,v 1.214 1997/05/07 10:42:06 yokota Exp $
  */
 
 #include "sc.h"
@@ -718,7 +718,6 @@ scioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
     int error;
     u_int i;
     struct tty *tp;
-    struct trapframe *fp;
     scr_stat *scp;
 
     tp = scdevtotty(dev);
@@ -1138,13 +1137,11 @@ scioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
 	    return error;
 	if (securelevel > 0)
 	    return EPERM;
-	fp = (struct trapframe *)p->p_md.md_regs;
-	fp->tf_eflags |= PSL_IOPL;
+	p->p_md.md_regs->tf_eflags |= PSL_IOPL;
 	return 0;
 
     case KDDISABIO:     	/* disallow io operations (default) */
-	fp = (struct trapframe *)p->p_md.md_regs;
-	fp->tf_eflags &= ~PSL_IOPL;
+	p->p_md.md_regs->tf_eflags &= ~PSL_IOPL;
 	return 0;
 
     case KDSETMODE:     	/* set current mode of this (virtual) console */
diff --git a/sys/i386/i386/mem.c b/sys/i386/i386/mem.c
index 9fb1525a6930..bfe5bfff7017 100644
--- a/sys/i386/i386/mem.c
+++ b/sys/i386/i386/mem.c
@@ -38,7 +38,7 @@
  *
  *	from: Utah $Hdr: mem.c 1.13 89/10/08$
  *	from: @(#)mem.c	7.2 (Berkeley) 5/9/91
- *	$Id: mem.c,v 1.41 1997/02/22 09:32:33 peter Exp $
+ *	$Id: mem.c,v 1.42 1997/04/14 15:54:26 bde Exp $
  */
 
 /*
@@ -145,16 +145,13 @@ mmclose(dev, flags, fmt, p)
 	int fmt;
 	struct proc *p;
 {
-	struct trapframe *fp;
-
 	switch (minor(dev)) {
 #ifdef PERFMON
 	case 32:
 		return perfmon_close(dev, flags, fmt, p);
 #endif
 	case 14:
-		fp = (struct trapframe *)curproc->p_md.md_regs;
-		fp->tf_eflags &= ~PSL_IOPL;
+		curproc->p_md.md_regs->tf_eflags &= ~PSL_IOPL;
 		break;
 	default:
 		break;
@@ -170,7 +167,6 @@ mmopen(dev, flags, fmt, p)
 	struct proc *p;
 {
 	int error;
-	struct trapframe *fp;
 
 	switch (minor(dev)) {
 	case 32:
@@ -185,8 +181,7 @@ mmopen(dev, flags, fmt, p)
 			return (error);
 		if (securelevel > 0)
 			return (EPERM);
-		fp = (struct trapframe *)curproc->p_md.md_regs;
-		fp->tf_eflags |= PSL_IOPL;
+		curproc->p_md.md_regs->tf_eflags |= PSL_IOPL;
 		break;
 	default:
 		break;
diff --git a/sys/i386/isa/spigot.c b/sys/i386/isa/spigot.c
index c149895dd68c..9c76e8101f36 100644
--- a/sys/i386/isa/spigot.c
+++ b/sys/i386/isa/spigot.c
@@ -211,7 +211,6 @@ spigot_ioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
 {
 int			error;
 struct	spigot_softc	*ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
-struct	trapframe	*fp;
 struct	spigot_info	*info;
 
 	if(!data) return(EINVAL);
@@ -228,12 +227,10 @@ struct	spigot_info	*info;
 		if (securelevel > 0)
 			return EPERM;
 #endif
-		fp=(struct trapframe *)p->p_md.md_regs;
-		fp->tf_eflags |= PSL_IOPL;
+		p->p_md.md_regs->tf_eflags |= PSL_IOPL;
 		break;
 	case	SPIGOT_IOPL_OFF: /* deny access to the IO PAGE */
-		fp=(struct trapframe *)p->p_md.md_regs;
-		fp->tf_eflags &= ~PSL_IOPL;
+		p->p_md.md_regs->tf_eflags &= ~PSL_IOPL;
 		break;
 	case	SPIGOT_GET_INFO:
 		info = (struct spigot_info *)data;
diff --git a/sys/i386/isa/syscons.c b/sys/i386/isa/syscons.c
index 641da111d6d5..ae7b43282852 100644
--- a/sys/i386/isa/syscons.c
+++ b/sys/i386/isa/syscons.c
@@ -25,7 +25,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *  $Id: syscons.c,v 1.213 1997/04/30 15:31:22 ache Exp $
+ *  $Id: syscons.c,v 1.214 1997/05/07 10:42:06 yokota Exp $
  */
 
 #include "sc.h"
@@ -718,7 +718,6 @@ scioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
     int error;
     u_int i;
     struct tty *tp;
-    struct trapframe *fp;
     scr_stat *scp;
 
     tp = scdevtotty(dev);
@@ -1138,13 +1137,11 @@ scioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
 	    return error;
 	if (securelevel > 0)
 	    return EPERM;
-	fp = (struct trapframe *)p->p_md.md_regs;
-	fp->tf_eflags |= PSL_IOPL;
+	p->p_md.md_regs->tf_eflags |= PSL_IOPL;
 	return 0;
 
     case KDDISABIO:     	/* disallow io operations (default) */
-	fp = (struct trapframe *)p->p_md.md_regs;
-	fp->tf_eflags &= ~PSL_IOPL;
+	p->p_md.md_regs->tf_eflags &= ~PSL_IOPL;
 	return 0;
 
     case KDSETMODE:     	/* set current mode of this (virtual) console */
diff --git a/sys/isa/syscons.c b/sys/isa/syscons.c
index 641da111d6d5..ae7b43282852 100644
--- a/sys/isa/syscons.c
+++ b/sys/isa/syscons.c
@@ -25,7 +25,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *  $Id: syscons.c,v 1.213 1997/04/30 15:31:22 ache Exp $
+ *  $Id: syscons.c,v 1.214 1997/05/07 10:42:06 yokota Exp $
  */
 
 #include "sc.h"
@@ -718,7 +718,6 @@ scioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
     int error;
     u_int i;
     struct tty *tp;
-    struct trapframe *fp;
     scr_stat *scp;
 
     tp = scdevtotty(dev);
@@ -1138,13 +1137,11 @@ scioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
 	    return error;
 	if (securelevel > 0)
 	    return EPERM;
-	fp = (struct trapframe *)p->p_md.md_regs;
-	fp->tf_eflags |= PSL_IOPL;
+	p->p_md.md_regs->tf_eflags |= PSL_IOPL;
 	return 0;
 
     case KDDISABIO:     	/* disallow io operations (default) */
-	fp = (struct trapframe *)p->p_md.md_regs;
-	fp->tf_eflags &= ~PSL_IOPL;
+	p->p_md.md_regs->tf_eflags &= ~PSL_IOPL;
 	return 0;
 
     case KDSETMODE:     	/* set current mode of this (virtual) console */