From affbc4d346309ddea7cac08598a421476961855c Mon Sep 17 00:00:00 2001
From: pk <pk@NetBSD.org>
Date: Mon, 26 Jun 1995 22:36:32 +0000
Subject: [PATCH] Define variables and macros for DVMA allocation using rmaps.

---
 sys/arch/sparc/include/param.h | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/sys/arch/sparc/include/param.h b/sys/arch/sparc/include/param.h
index a1c2959d7dd8..55c3f1f61b97 100644
--- a/sys/arch/sparc/include/param.h
+++ b/sys/arch/sparc/include/param.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: param.h,v 1.14 1995/06/26 06:56:14 cgd Exp $ */
+/*	$NetBSD: param.h,v 1.15 1995/06/26 22:36:32 pk Exp $ */
 
 /*
  * Copyright (c) 1992, 1993
@@ -157,6 +157,30 @@ extern int nbpg, pgofset, pgshift;
  */
 #define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE / DEV_BSIZE))
 
+/*
+ * dvmamap manages a range of DVMA addresses intended to create double
+ * mappings of physical memory. In a way, `dvmamap' is a submap of the
+ * VM map `phys_map'. The difference is the use of the `resource map'
+ * routines to manage page allocation, allowing DVMA addresses to be
+ * allocated and freed from within interrupt routines.
+ *
+ * Note that `phys_map' can still be used to allocate memory-backed pages
+ * in DVMA space.
+ */
+#ifdef _KERNEL
+#ifndef LOCORE
+extern vm_offset_t	dvmabase;
+extern struct map	*dvmamap;
+#endif
+#endif
+/*
+ * The dvma resource map is defined in page units, which are numbered 1 to N.
+ * Use these macros to convert to/from virtual addresses.
+ */
+#define rctov(n)		(ctob(((n)-1))+dvmabase)
+#define vtorc(v)		((btoc((v)-dvmabase))+1)
+
+
 #ifdef _KERNEL
 #ifndef LOCORE
 #define	DELAY(n)	delay(n)