From 413f678ce03f5cfd3064a4898491033f73173a65 Mon Sep 17 00:00:00 2001
From: thorpej <thorpej@NetBSD.org>
Date: Sat, 7 Jun 1997 05:29:33 +0000
Subject: [PATCH] Pull the thorpej-bus-dma branch into the mainline.

---
 sys/arch/alpha/common/sgmapvar.h | 83 ++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 sys/arch/alpha/common/sgmapvar.h

diff --git a/sys/arch/alpha/common/sgmapvar.h b/sys/arch/alpha/common/sgmapvar.h
new file mode 100644
index 000000000000..8c8524a1e0dd
--- /dev/null
+++ b/sys/arch/alpha/common/sgmapvar.h
@@ -0,0 +1,83 @@
+/* $NetBSD: sgmapvar.h,v 1.2 1997/06/07 05:29:33 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.
+ */
+
+#include <sys/extent.h>
+#include <machine/bus.h>
+
+/*
+ * Bits n:13 of the DMA address are the index of the PTE into
+ * the SGMAP page table.
+ */
+#define	SGMAP_ADDR_PTEIDX_SHIFT	13
+
+/*
+ * An Alpha SGMAP's state information.
+ */
+struct alpha_sgmap {
+	struct extent *aps_ex;		/* extent map to manage sgva space */
+	void	*aps_pt;		/* page table */
+	bus_addr_t aps_ptpa;		/* page table physical address */
+	bus_addr_t aps_sgvabase;	/* base of the sgva space */
+	bus_size_t aps_sgvasize;	/* size of the sgva space */
+	bus_addr_t aps_wbase;		/* base of the dma window */
+};
+
+/*
+ * Cookie used to store SGMAP state for a DMA mapping.  We
+ * could compute some of this at unload time, but storing it
+ * is convenient.
+ */
+struct alpha_sgmap_cookie {
+	int	apdc_pteidx;		/* PTE index */
+	int	apdc_ptecnt;		/* PTE count */
+	u_long	apdc_sgva;		/* allocated sgva */
+	bus_size_t apdc_len;		/* sgva size */
+	int	apdc_flags;
+};
+
+/* apdc_flags */
+#define	APDC_HAS_SGMAP		0x01	/* sgva/len are valid */
+
+void	alpha_sgmap_init __P((bus_dma_tag_t, struct alpha_sgmap *,
+	    const char *, bus_addr_t, bus_addr_t, bus_size_t, size_t, void *));
+
+int	alpha_sgmap_alloc __P((bus_dmamap_t, bus_size_t,
+	    struct alpha_sgmap *, int));
+void	alpha_sgmap_free __P((struct alpha_sgmap *,
+	    struct alpha_sgmap_cookie *));