From 7d813b16c3fc9b5d1d996af11b41624c41b9aee3 Mon Sep 17 00:00:00 2001
From: jonathan <jonathan@NetBSD.org>
Date: Sun, 29 Nov 1998 03:18:32 +0000
Subject: [PATCH] Add PV_REFERENCED and track as for PV_MODIFIED,.

UVM relies on pmap modules keeping track of modified/referenced bits
after a page has been removed from all mappings.  So *dont* clear
PV_REFERENCED or PV_MODIFIED flags in pmap_remove().
---
 sys/arch/mips/include/pmap.h |  4 +++-
 sys/arch/mips/mips/pmap.c    | 42 ++++++++++++++++++++----------------
 2 files changed, 27 insertions(+), 19 deletions(-)

diff --git a/sys/arch/mips/include/pmap.h b/sys/arch/mips/include/pmap.h
index 4158228a696a..0a448eb1c999 100644
--- a/sys/arch/mips/include/pmap.h
+++ b/sys/arch/mips/include/pmap.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: pmap.h,v 1.20 1998/11/15 02:34:19 mhitch Exp $	*/
+/*	$NetBSD: pmap.h,v 1.21 1998/11/29 03:18:32 jonathan Exp $	*/
 
 /* 
  * Copyright (c) 1987 Carnegie-Mellon University
@@ -104,6 +104,7 @@ typedef struct pv_entry {
 
 #define	PV_UNCACHED	0x0001		/* page is mapped uncached */
 #define	PV_MODIFIED	0x0002		/* page has been modified */
+#define	PV_REFERENCED	0x0004		/* page has been recently referenced */
 
 
 #ifdef	_KERNEL
@@ -121,6 +122,7 @@ struct pmap kernel_pmap_store;
 void	pmap_bootstrap __P((void));
 
 void	pmap_set_modified __P((vm_offset_t));
+void	pmap_set_referenced __P((vm_offset_t));
 
 /*
  * pmap_prefer()  helps reduce virtual-coherency exceptions in
diff --git a/sys/arch/mips/mips/pmap.c b/sys/arch/mips/mips/pmap.c
index 5859048e19b8..674ec641f72e 100644
--- a/sys/arch/mips/mips/pmap.c
+++ b/sys/arch/mips/mips/pmap.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: pmap.c,v 1.43 1998/11/15 02:34:37 mhitch Exp $	*/
+/*	$NetBSD: pmap.c,v 1.44 1998/11/29 03:18:32 jonathan Exp $	*/
 
 /*-
  * Copyright (c) 1998 The NetBSD Foundation, Inc.
@@ -78,7 +78,7 @@
 
 #include <sys/cdefs.h>
 
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.43 1998/11/15 02:34:37 mhitch Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.44 1998/11/29 03:18:32 jonathan Exp $");
 
 /*
  *	Manages physical address maps.
@@ -728,9 +728,12 @@ pmap_remove(pmap, sva, eva)
 					MachFlushDCache(sva, PAGE_SIZE);
 #endif /* mips3 */
 			}
+
+#ifdef notanymore
 			if (PAGE_IS_MANAGED(pfn_to_vad(entry)))
 				*pa_to_attribute(pfn_to_vad(entry)) &=
 				    ~PV_MODIFIED;
+#endif
 
 
 			if (CPUISMIPS3)
@@ -784,9 +787,12 @@ pmap_remove(pmap, sva, eva)
 					MachFlushDCache(sva, PAGE_SIZE);
 #endif /* mips3 */
 			}
+
+#ifdef notanymore
 			if (PAGE_IS_MANAGED(pfn_to_vad(entry)))
 				*pa_to_attribute(pfn_to_vad(entry)) &=
 				    ~PV_MODIFIED;
+#endif
 			pte->pt_entry = mips_pg_nv_bit();
 			/*
 			 * Flush the TLB for the given address.
@@ -1648,22 +1654,6 @@ pmap_pageable(pmap, sva, eva, pageable)
 #endif
 }
 
-/*
- *	Clear the modify bits on the specified physical page.
- */
-void
-pmap_clear_modify(pa)
-	vm_offset_t pa;
-{
-
-#ifdef DEBUG
-	if (pmapdebug & PDB_FOLLOW)
-		printf("pmap_clear_modify(%lx)\n", pa);
-#endif
-	if (PAGE_IS_MANAGED(pa))
-		*pa_to_attribute(pa) &= ~PV_MODIFIED;
-}
-
 /*
  *	pmap_clear_reference:
  *
@@ -1700,6 +1690,22 @@ pmap_is_referenced(pa)
 #endif
 }
 
+/*
+ *	Clear the modify bits on the specified physical page.
+ */
+void
+pmap_clear_modify(pa)
+	vm_offset_t pa;
+{
+
+#ifdef DEBUG
+	if (pmapdebug & PDB_FOLLOW)
+		printf("pmap_clear_modify(%lx)\n", pa);
+#endif
+	if (PAGE_IS_MANAGED(pa))
+		*pa_to_attribute(pa) &= ~PV_MODIFIED;
+}
+
 /*
  *	pmap_is_modified:
  *