From owner-p4-projects@FreeBSD.ORG  Sat Mar  6 23:30:46 2004
Return-Path: <owner-p4-projects@FreeBSD.ORG>
Delivered-To: p4-projects@freebsd.org
Received: by hub.freebsd.org (Postfix, from userid 32767)
	id C008416A4D0; Sat,  6 Mar 2004 23:30:45 -0800 (PST)
Delivered-To: perforce@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 9A44E16A4CE
	for <perforce@freebsd.org>; Sat,  6 Mar 2004 23:30:45 -0800 (PST)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 9309443D1D
	for <perforce@freebsd.org>; Sat,  6 Mar 2004 23:30:45 -0800 (PST)
	(envelope-from jmallett@freebsd.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.12.10/8.12.10) with ESMTP id i277UjGe091965
	for <perforce@freebsd.org>; Sat, 6 Mar 2004 23:30:45 -0800 (PST)
	(envelope-from jmallett@freebsd.org)
Received: (from perforce@localhost)
	by repoman.freebsd.org (8.12.10/8.12.10/Submit) id i277Uj1K091960
	for perforce@freebsd.org; Sat, 6 Mar 2004 23:30:45 -0800 (PST)
	(envelope-from jmallett@freebsd.org)
Date: Sat, 6 Mar 2004 23:30:45 -0800 (PST)
Message-Id: <200403070730.i277Uj1K091960@repoman.freebsd.org>
X-Authentication-Warning: repoman.freebsd.org: perforce set sender to
	jmallett@freebsd.org using -f
From: Juli Mallett <jmallett@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
Subject: PERFORCE change 48334 for review
X-BeenThere: p4-projects@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: p4 projects tree changes <p4-projects.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/p4-projects>,
	<mailto:p4-projects-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/p4-projects>
List-Post: <mailto:p4-projects@freebsd.org>
List-Help: <mailto:p4-projects-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/p4-projects>,
	<mailto:p4-projects-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 07 Mar 2004 07:30:46 -0000

http://perforce.freebsd.org/chv.cgi?CH=48334

Change 48334 by jmallett@jmallett_oingo on 2004/03/06 23:30:02

	Initial scribblings of cache attrs for pte's.

Affected files ...

.. //depot/projects/mips/sys/mips/include/pte.h#21 edit

Differences ...

==== //depot/projects/mips/sys/mips/include/pte.h#21 (text+ko) ====

@@ -80,10 +80,7 @@
 
 /*
  * TLB flags managed in hardware:
- * 	C:	We ignore this field, as it will only give us a
- * 		headache in certain CPUs.  Better not to bother for
- * 		now, though in time we may want to support multiple
- * 		cache schemes for VM.
+ * 	C:	Cache attribute.
  * 	D:	Dirty bit.  This means a page is writable.  It is not
  * 		set at first, and a write is trapped, and the dirty
  * 		bit is set.  See also PG_RO.
@@ -92,9 +89,11 @@
  * 		in EVERY address space, and to ignore the ASID when
  * 		it is matched.
  */
-#define	PG_D	0x04
-#define	PG_V	0x02
-#define	PG_G	0x01
+#define	PG_C(attr)	((attr & 0x07) << 3)
+#define	PG_C_UNCACHED	(PG_C(0x02))
+#define	PG_D		0x04
+#define	PG_V		0x02
+#define	PG_G		0x01
 
 /*
  * VM flags managed in software: