initial import of NetBSD tree

1 files changed, 105 insertions, 0 deletions

diff --git a/sys/arch/sun3/include/dvma.h b/sys/arch/sun3/include/dvma.h
new file mode 100644
index 00000000000..a48a2a19672
--- /dev/null
+++ b/sys/arch/sun3/include/dvma.h
@@ -0,0 +1,105 @@
+/*	$NetBSD: dvma.h,v 1.1 1995/09/26 04:02:08 gwr 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 W. 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.
+ */
+
+/*
+ * DVMA (Direct Virtual Memory Access - like DMA)
+ *
+ * The Sun3 MMU is presented to secondary masters using DVMA.
+ * Before such devices can access kernel memory, that memory
+ * must be mapped into the kernel DVMA space.  All DVMA space
+ * is presented as slave-accessible memory for VME and OBIO
+ * devices, though not at the same address seen by the CPU.
+ *
+ * Relevant parts of virtual memory map are:
+ *
+ * 0FE0.0000  monitor map (devices)
+ * 0FF0.0000  DVMA space
+ * 0FFE.0000  monitor RAM seg.
+ * 0FFF.E000  monitor RAM page
+ *
+ * Note that while the DVMA harware makes the last 1MB visible
+ * for secondary masters, the PROM "owns" the last page of it.
+ * Also note that OBIO devices can actually see the last 16MB
+ * of kernel virtual space.  That can be mostly ignored, except
+ * when calculating the alias address for slave access.
+ */
+
+/*
+ * This range could be managed as whole MMU segments.
+ * The last segment is pre-allocated (see below)
+ */
+#define DVMA_SEGMAP_BASE	0x0FF00000
+#define DVMA_SEGMAP_SIZE	0x000E0000
+#define DVMA_SEGMAP_END (DVMA_SEGMAP_BASE+DVMA_SEGMAP_SIZE)
+
+/*
+ * This range is managed as individual pages.
+ * The last page is owned by the PROM monitor.
+ */
+#define DVMA_PAGEMAP_BASE	0x0FFE0000
+#define DVMA_PAGEMAP_SIZE	0x0001E000
+#define DVMA_PAGEMAP_END (DVMA_PAGEMAP_BASE+DVMA_PAGEMAP_SIZE)
+
+/*
+ * To convert an address in DVMA space to a slave address,
+ * just use a logical AND with one of the following masks.
+ * To convert back, use logical OR with DVMA_SEGMAP_BASE.
+ */
+#define DVMA_OBIO_SLAVE_BASE 0x0F000000
+#define DVMA_OBIO_SLAVE_MASK 0x00FFffff	/* 16MB */
+
+#define DVMA_VME_SLAVE_BASE  0x0FF00000	/*  1MB */
+#define DVMA_VME_SLAVE_MASK  0x000Fffff	/*  1MB */
+
+
+#if 1	/* XXX - temporary */
+/*
+ * XXX - For compatibility, until DVMA is re-worked.
+ * Total DVMA space covers SEGMAP + PAGEMAP
+ */
+#define	DVMA_SPACE_START DVMA_SEGMAP_BASE
+#define DVMA_SPACE_END   DVMA_PAGEMAP_END
+#define DVMA_SPACE_SIZE	 (DVMA_SPACE_END - DVMA_SPACE_START)
+#endif	/* XXX */
+
+/*
+ * XXX - These will change!  (will be like the sparc)
+ */
+
+caddr_t dvma_malloc(size_t bytes);
+void dvma_free(caddr_t addr, size_t bytes);
+
+caddr_t dvma_mapin(char *kva, int len);
+void dvma_mapout(caddr_t dvma_addr, int len);
+
+long dvma_kvtopa(long kva, int bus);
+