1 files changed, 119 insertions, 0 deletions
diff --git a/sys/arch/sparc/stand/dvma.c b/sys/arch/sparc/stand/dvma.c
new file mode 100644
index 00000000000..ffa50eef23f
--- /dev/null
+++ b/sys/arch/sparc/stand/dvma.c
@@ -0,0 +1,119 @@
+/*	$NetBSD: dvma.c,v 1.2 1995/09/17 00:50:56 pk Exp $	*/
+/*
+ * Copyright (c) 1995 Gordon W. Ross
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ * 4. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Gordon Ross
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * The easiest way to deal with the need for DVMA mappings is
+ * to just map the entire third megabyte of RAM into DVMA space.
+ * That way, dvma_mapin can just compute the DVMA alias address,
+ * and dvma_mapout does nothing.  Note that this assumes all
+ * standalone programs stay in the range SA_MIN_VA .. SA_MAX_VA
+ */
+
+#include <sys/param.h>
+#include <machine/pte.h>
+#include <machine/ctlreg.h>
+#include "promdev.h"
+
+#define	DVMA_BASE	0xFFF00000
+#define DVMA_MAPLEN	0xE0000	/* 1 MB - 128K (save MONSHORTSEG) */
+
+#define SA_MIN_VA	(RELOC - 0x40000)	/* XXX - magic constant */
+#define SA_MAX_VA	(SA_MIN_VA + DVMA_MAPLEN)
+
+void
+dvma_init()
+{
+	register int segva, dmava;
+
+	dmava = DVMA_BASE;
+	for (segva = SA_MIN_VA; segva < SA_MAX_VA; segva += NBPSG) {
+		setsegmap(dmava, getsegmap(segva));
+		dmava += NBPSG;
+	}
+}
+
+/*
+ * Convert a local address to a DVMA address.
+ */
+char *
+dvma_mapin(char *addr, size_t len)
+{
+	register int va = (int)addr;
+
+	/* Make sure the address is in the DVMA map. */
+	if ((va < SA_MIN_VA) || (va >= SA_MAX_VA))
+		panic("dvma_mapin");
+
+	va += DVMA_BASE - SA_MIN_VA;
+
+	return ((char *)va);
+}
+
+/*
+ * Convert a DVMA address to a local address.
+ */
+char *
+dvma_mapout(char *addr, size_t len)
+{
+	int va = (int)addr;
+
+	/* Make sure the address is in the DVMA map. */
+	if ((va < DVMA_BASE) || (va >= (DVMA_BASE + DVMA_MAPLEN)))
+		panic("dvma_mapout");
+
+	va -= DVMA_BASE - SA_MIN_VA;
+
+	return ((char *)va);
+}
+
+extern char *alloc __P((int));
+
+char *
+dvma_alloc(int len)
+{
+	char *mem;
+
+	mem = alloc(len);
+	if (!mem)
+		return (mem);
+	return (dvma_mapin(mem, len));
+}
+
+extern void free(void *ptr, int len);
+void
+dvma_free(char *dvma, int len)
+{
+	char *mem;
+
+	mem = dvma_mapout(dvma, len);
+	if (mem)
+		free(mem, len);
+}