Big TURBOchannel support catchup from NetBSD, part 1.

A few local changes and tweaks remain.

This bring DEC 3000 machines back in the game, but framebuffers are still
not supported at the moment.

Thanks to ericj@ and nate@ for supplying me a DEC 3000 for testing.

1 files changed, 60 insertions, 0 deletions

diff --git a/sys/arch/alpha/tc/tc_sgmap.h b/sys/arch/alpha/tc/tc_sgmap.h
new file mode 100644
index 00000000000..39392db3870
--- /dev/null
+++ b/sys/arch/alpha/tc/tc_sgmap.h
@@ -0,0 +1,60 @@
+/* $OpenBSD: tc_sgmap.h,v 1.1 2002/05/02 22:56:06 miod Exp $ */
+/* $NetBSD: tc_sgmap.h,v 1.2 1997/06/07 00:02:20 thorpej Exp $ */
+
+/*-
+ * Copyright (c) 1997 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
+ * NASA Ames Research Center.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the NetBSD
+ *	Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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.
+ */
+
+#define	SGMAP_TYPE		tc_sgmap
+#define	SGMAP_PTE_TYPE		u_int32_t
+#define	SGMAP_PTE_SPACING	2
+
+/*
+ * A TurboChannel SGMAP page table entry looks like this:
+ *
+ * 31                    23  22  21 20           4 3    0
+ * |     Discarded     | V | F | P | Page address | UNP |
+ *
+ * The page address is bits <29:13> of the physical address of the
+ * page.  The V bit is set if the PTE holds a valid mapping.
+ * The F (funny) bit forces a parity error.  The P bit is a
+ * hardware-generated parity bit.
+ */
+#define	SGPTE_PGADDR_SHIFT	9
+#define	SGPTE_VALID		0x00800000
+
+#include <alpha/dev/sgmapvar.h>
+#include <alpha/dev/sgmap_typedep.h>