From 6eb290c167c4a5f9543379bf27e0960d0a22f85f Mon Sep 17 00:00:00 2001
From: Miod Vallat <miod@cvs.openbsd.org>
Date: Thu, 30 Dec 2004 21:28:49 +0000
Subject: If we are running on a 68040 or a 68060 processor, overwrite the
 copypage() code with the faster copypage040() before the kernel text is
 mapped read-only.

---
 sys/arch/hp300/hp300/locore.s     | 20 +++++++++++++++++++-
 sys/arch/mac68k/mac68k/locore.s   | 21 ++++++++++++++++++++-
 sys/arch/mvme68k/mvme68k/locore.s | 19 ++++++++++++++++++-
 3 files changed, 57 insertions(+), 3 deletions(-)

(limited to 'sys')

diff --git a/sys/arch/hp300/hp300/locore.s b/sys/arch/hp300/hp300/locore.s
index c8820504608..7b3d01ae55b 100644
--- a/sys/arch/hp300/hp300/locore.s
+++ b/sys/arch/hp300/hp300/locore.s
@@ -1,4 +1,4 @@
-/*	$OpenBSD: locore.s,v 1.44 2004/12/30 21:26:14 miod Exp $	*/
+/*	$OpenBSD: locore.s,v 1.45 2004/12/30 21:28:47 miod Exp $	*/
 /*	$NetBSD: locore.s,v 1.91 1998/11/11 06:41:25 thorpej Exp $	*/
 
 /*
@@ -433,6 +433,23 @@ Lstart3:
 	jbsr	a0@			| pmap_bootstrap(firstpa, nextpa)
 	addql	#8,sp
 
+/*
+ * While still running physical, override copypage() with the 68040
+ * optimized version, copypage040(), if possible.
+ * This relies upon the fact that copypage() immediately follows
+ * copypage040() in memory.
+ */
+	RELOC(mmutype, a0)
+	cmpl	#MMU_68040,a0@
+	jgt	Lmmu_enable
+	RELOC(copypage040, a0)
+	RELOC(copypage, a1)
+	movl	a1, a2
+1:
+	movw	a0@+, a2@+
+	cmpl	a0, a1
+	jgt	1b
+
 /*
  * Prepare to enable MMU.
  * Since the kernel is not mapped logical == physical we must insure
@@ -443,6 +460,7 @@ Lstart3:
  *
  * Is this all really necessary, or am I paranoid??
  */
+Lmmu_enable:
 	RELOC(Sysseg, a0)		| system segment table addr
 	movl	a0@,d1			| read value (a KVA)
 	addl	a5,d1			| convert to PA
diff --git a/sys/arch/mac68k/mac68k/locore.s b/sys/arch/mac68k/mac68k/locore.s
index d87a17cb9dd..077b7929657 100644
--- a/sys/arch/mac68k/mac68k/locore.s
+++ b/sys/arch/mac68k/mac68k/locore.s
@@ -1,4 +1,4 @@
-/*	$OpenBSD: locore.s,v 1.43 2004/12/26 22:36:34 miod Exp $	*/
+/*	$OpenBSD: locore.s,v 1.44 2004/12/30 21:28:48 miod Exp $	*/
 /*	$NetBSD: locore.s,v 1.103 1998/07/09 06:02:50 scottr Exp $	*/
 
 /*
@@ -254,6 +254,25 @@ Lstart3:
 	movl	#_C_LABEL(vectab),d0	| set Vector Base Register
 	movc	d0,vbr
 
+/*
+ * We might not be running physical, but we don't have read-only mappings
+ * yet either. It's time to override copypage() with the 68040
+ * optimized version, copypage040(), if possible.
+ * This relies upon the fact that copypage() immediately follows
+ * copypage040() in memory.
+ */
+	movl	#_C_LABEL(mmutype),a0
+	cmpl	#MMU_68040,a0@
+	jgt	Lmmu_enable
+	movl	#_C_LABEL(copypage040),a0
+	movl	#_C_LABEL(copypage),a1
+	movl	a1, a2
+1:
+	movw	a0@+, a2@+
+	cmpl	a0, a1
+	jgt	1b
+
+Lmmu_enable:
 	movl	_C_LABEL(Sysseg),a1	| system segment table addr
 	addl	_C_LABEL(load_addr),a1	| Make it physical addr
 	cmpl	#MMU_68040,_C_LABEL(mmutype)
diff --git a/sys/arch/mvme68k/mvme68k/locore.s b/sys/arch/mvme68k/mvme68k/locore.s
index 09b3f9168df..6e41e389a2e 100644
--- a/sys/arch/mvme68k/mvme68k/locore.s
+++ b/sys/arch/mvme68k/mvme68k/locore.s
@@ -1,4 +1,4 @@
-/*	$OpenBSD: locore.s,v 1.46 2004/12/24 22:50:30 miod Exp $ */
+/*	$OpenBSD: locore.s,v 1.47 2004/12/30 21:28:48 miod Exp $ */
 
 /*
  * Copyright (c) 1995 Theo de Raadt
@@ -448,6 +448,23 @@ Lstart2:
 	jbsr	a0@			| pmap_bootstrap(firstpa, nextpa)
 	addql	#8,sp
 
+/*
+ * While still running physical, override copypage() with the 68040
+ * optimized version, copypage040(), if possible.
+ * This relies upon the fact that copypage() immediately follows
+ * copypage040() in memory.
+ */
+	RELOC(mmutype, a0)
+	cmpl	#MMU_68040,a0@
+	jgt	Lmmu_enable
+	RELOC(copypage040, a0)
+	RELOC(copypage, a1)
+	movl	a1, a2
+1:
+	movw	a0@+, a2@+
+	cmpl	a0, a1
+	jgt	1b
+
 /*
  * Enable the MMU.
  * Since the kernel is mapped logical == physical, we just turn it on.
-- 
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