From 7886fa77b7f089a120d84c0225e84e2e889957ae Mon Sep 17 00:00:00 2001
From: tholo <tholo@openbsd.org>
Date: Tue, 7 Jan 1997 05:37:32 +0000
Subject: [PATCH] Fix for final ptdi panic on i386

---
 sys/arch/i386/i386/pmap.c        | 19 ++++++++++++++++++-
 sys/arch/i386/i386/pmap.old.c    | 19 ++++++++++++++++++-
 sys/arch/i386/include/pmap.h     |  3 ++-
 sys/arch/i386/include/pmap.old.h |  3 ++-
 sys/miscfs/procfs/procfs_mem.c   |  8 ++++++--
 sys/vm/vm_extern.h               |  6 +++---
 sys/vm/vm_glue.c                 | 17 ++++++++++-------
 sys/vm/vm_mmap.c                 |  6 +++---
 8 files changed, 62 insertions(+), 19 deletions(-)

diff --git a/sys/arch/i386/i386/pmap.c b/sys/arch/i386/i386/pmap.c
index cf4c5717c1f..3e7d0d0db44 100644
--- a/sys/arch/i386/i386/pmap.c
+++ b/sys/arch/i386/i386/pmap.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pmap.c,v 1.15 1996/10/25 11:14:13 deraadt Exp $	*/
+/*	$OpenBSD: pmap.c,v 1.16 1997/01/07 05:37:32 tholo Exp $	*/
 /*	$NetBSD: pmap.c,v 1.36 1996/05/03 19:42:22 christos Exp $	*/
 
 /*
@@ -1726,6 +1726,23 @@ pmap_changebit(pa, setbits, maskbits)
 	splx(s);
 }
 
+void
+pmap_prefault(map, v, l)
+	vm_map_t map;
+	vm_offset_t v;
+	vm_size_t l;
+{
+	vm_offset_t pv, pv2;
+
+	for (pv = v; pv < v + l ; pv += ~PD_MASK + 1) {
+		if (!pmap_pde_v(pmap_pde(map->pmap, pv))) {
+			pv2 = trunc_page(vtopte(pv));
+			vm_fault(map, pv2, VM_PROT_READ, FALSE);
+		}
+		pv &= PD_MASK;
+	}
+}
+
 #ifdef DEBUG
 void
 pmap_pvdump(pa)
diff --git a/sys/arch/i386/i386/pmap.old.c b/sys/arch/i386/i386/pmap.old.c
index 57ae1e13313..0aa7a5d478f 100644
--- a/sys/arch/i386/i386/pmap.old.c
+++ b/sys/arch/i386/i386/pmap.old.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pmap.old.c,v 1.15 1996/10/25 11:14:13 deraadt Exp $	*/
+/*	$OpenBSD: pmap.old.c,v 1.16 1997/01/07 05:37:32 tholo Exp $	*/
 /*	$NetBSD: pmap.c,v 1.36 1996/05/03 19:42:22 christos Exp $	*/
 
 /*
@@ -1726,6 +1726,23 @@ pmap_changebit(pa, setbits, maskbits)
 	splx(s);
 }
 
+void
+pmap_prefault(map, v, l)
+	vm_map_t map;
+	vm_offset_t v;
+	vm_size_t l;
+{
+	vm_offset_t pv, pv2;
+
+	for (pv = v; pv < v + l ; pv += ~PD_MASK + 1) {
+		if (!pmap_pde_v(pmap_pde(map->pmap, pv))) {
+			pv2 = trunc_page(vtopte(pv));
+			vm_fault(map, pv2, VM_PROT_READ, FALSE);
+		}
+		pv &= PD_MASK;
+	}
+}
+
 #ifdef DEBUG
 void
 pmap_pvdump(pa)
diff --git a/sys/arch/i386/include/pmap.h b/sys/arch/i386/include/pmap.h
index 4d43e526f80..67415f52349 100644
--- a/sys/arch/i386/include/pmap.h
+++ b/sys/arch/i386/include/pmap.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pmap.h,v 1.7 1996/10/25 11:14:16 deraadt Exp $	*/
+/*	$OpenBSD: pmap.h,v 1.8 1997/01/07 05:37:34 tholo Exp $	*/
 /*	$NetBSD: pmap.h,v 1.23 1996/05/03 19:26:30 christos Exp $	*/
 
 /* 
@@ -86,6 +86,7 @@ extern int	PTDpaddr;	/* physical address of kernel PTD */
 void pmap_bootstrap __P((vm_offset_t start));
 boolean_t pmap_testbit __P((vm_offset_t, int));
 void pmap_changebit __P((vm_offset_t, int, int));
+void pmap_prefault __P((vm_map_t, vm_offset_t, vm_size_t));
 #endif
 
 /*
diff --git a/sys/arch/i386/include/pmap.old.h b/sys/arch/i386/include/pmap.old.h
index 3fbeaf58fdd..bbe198f994f 100644
--- a/sys/arch/i386/include/pmap.old.h
+++ b/sys/arch/i386/include/pmap.old.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pmap.old.h,v 1.7 1996/10/25 11:14:16 deraadt Exp $	*/
+/*	$OpenBSD: pmap.old.h,v 1.8 1997/01/07 05:37:34 tholo Exp $	*/
 /*	$NetBSD: pmap.h,v 1.23 1996/05/03 19:26:30 christos Exp $	*/
 
 /* 
@@ -86,6 +86,7 @@ extern int	PTDpaddr;	/* physical address of kernel PTD */
 void pmap_bootstrap __P((vm_offset_t start));
 boolean_t pmap_testbit __P((vm_offset_t, int));
 void pmap_changebit __P((vm_offset_t, int, int));
+void pmap_prefault __P((vm_map_t, vm_offset_t, vm_size_t));
 #endif
 
 /*
diff --git a/sys/miscfs/procfs/procfs_mem.c b/sys/miscfs/procfs/procfs_mem.c
index 901f13c5e07..dd443a9ab57 100644
--- a/sys/miscfs/procfs/procfs_mem.c
+++ b/sys/miscfs/procfs/procfs_mem.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: procfs_mem.c,v 1.2 1996/02/27 08:03:36 niklas Exp $	*/
+/*	$OpenBSD: procfs_mem.c,v 1.3 1997/01/07 05:37:35 tholo Exp $	*/
 /*	$NetBSD: procfs_mem.c,v 1.8 1996/02/09 22:40:50 christos Exp $	*/
 
 /*
@@ -149,7 +149,11 @@ procfs_rwmem(p, uio)
 		 */
 		if (!error)
 			vm_map_lookup_done(tmap, out_entry);
-  
+
+#ifdef __i386__
+		pmap_prefault(map, pageno, PAGE_SIZE);
+#endif
+
 		/*
 		 * Fault the page in...
 		 */
diff --git a/sys/vm/vm_extern.h b/sys/vm/vm_extern.h
index cf93f186b1b..14346cb8a05 100644
--- a/sys/vm/vm_extern.h
+++ b/sys/vm/vm_extern.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vm_extern.h,v 1.8 1996/08/02 00:05:58 niklas Exp $	*/
+/*	$OpenBSD: vm_extern.h,v 1.9 1997/01/07 05:37:35 tholo Exp $	*/
 /*	$NetBSD: vm_extern.h,v 1.20 1996/04/23 12:25:23 christos Exp $	*/
 
 /*-
@@ -139,8 +139,8 @@ void		vmtotal __P((struct vmtotal *));
 void		vnode_pager_setsize __P((struct vnode *, u_long));
 void		vnode_pager_umount __P((struct mount *));
 boolean_t	vnode_pager_uncache __P((struct vnode *));
-void		vslock __P((caddr_t, u_int));
-void		vsunlock __P((caddr_t, u_int));
+int		vslock __P((caddr_t, u_int));
+int		vsunlock __P((caddr_t, u_int));
 
 /* Machine dependent portion */
 void		vmapbuf __P((struct buf *, vm_size_t));
diff --git a/sys/vm/vm_glue.c b/sys/vm/vm_glue.c
index 764435ddc34..2851697956f 100644
--- a/sys/vm/vm_glue.c
+++ b/sys/vm/vm_glue.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vm_glue.c,v 1.21 1996/11/23 23:19:54 kstailey Exp $    */
+/*	$OpenBSD: vm_glue.c,v 1.22 1997/01/07 05:37:36 tholo Exp $    */
 /*	$NetBSD: vm_glue.c,v 1.55.4.1 1996/06/13 17:25:45 cgd Exp $	*/
 
 /* 
@@ -173,22 +173,25 @@ chgkprot(addr, len, rw)
 }
 #endif
 
-void
+int
 vslock(addr, len)
 	caddr_t	addr;
 	u_int	len;
 {
-	vm_map_pageable(&curproc->p_vmspace->vm_map, trunc_page(addr),
-			round_page(addr+len), FALSE);
+#ifdef __i386__
+	pmap_prefault(&curproc->p_vmspace->vm_map, (vm_offset_t)addr, len);
+#endif
+	return vm_map_pageable(&curproc->p_vmspace->vm_map, trunc_page(addr),
+			       round_page(addr+len), FALSE);
 }
 
-void
+int
 vsunlock(addr, len)
 	caddr_t	addr;
 	u_int	len;
 {
-	vm_map_pageable(&curproc->p_vmspace->vm_map, trunc_page(addr),
-			round_page(addr+len), TRUE);
+	return vm_map_pageable(&curproc->p_vmspace->vm_map, trunc_page(addr),
+			       round_page(addr+len), TRUE);
 }
 
 /*
diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c
index 5008feb1277..0e614e86493 100644
--- a/sys/vm/vm_mmap.c
+++ b/sys/vm/vm_mmap.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vm_mmap.c,v 1.6 1996/04/21 22:33:13 deraadt Exp $	*/
+/*	$OpenBSD: vm_mmap.c,v 1.7 1997/01/07 05:37:37 tholo Exp $	*/
 /*	$NetBSD: vm_mmap.c,v 1.47 1996/03/16 23:15:23 christos Exp $	*/
 
 /*
@@ -599,7 +599,7 @@ sys_mlock(p, v, retval)
 		return (error);
 #endif
 
-	error = vm_map_pageable(&p->p_vmspace->vm_map, addr, addr+size, FALSE);
+	error = vslock((caddr_t)addr, size);
 	return (error == KERN_SUCCESS ? 0 : ENOMEM);
 }
 
@@ -642,7 +642,7 @@ sys_munlock(p, v, retval)
 		return (error);
 #endif
 
-	error = vm_map_pageable(&p->p_vmspace->vm_map, addr, addr+size, TRUE);
+	error = vsunlock((caddr_t)addr, size);
 	return (error == KERN_SUCCESS ? 0 : ENOMEM);
 }
 
-- 
2.20.1