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dvma3x.h revision 1.4 
      1 /*	$NetBSD: dvma3x.h,v 1.4 1998/01/22 22:20:35 gwr Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Gordon W. Ross.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * DVMA (Direct Virtual Memory Access - like DMA)
     41  *
     42  * (Most of the comments pertaining to the sun3x DVMA are now
     43  *  in dvma.c)
     44  *
     45  * Note that while the DVMA harware makes the last 1MB visible
     46  * for secondary masters, the PROM "owns" the last page of it.
     47  * Also note that OBIO devices can actually see the last 16MB
     48  * of kernel virtual space.  That can be mostly ignored, except
     49  * when calculating the alias address for slave access.
     50  */
     51 #define DVMA_MAP_BASE	0xFFF00000
     52 #define DVMA_MAP_SIZE	0x00100000
     53 #define DVMA_MAP_AVAIL	(DVMA_MAP_SIZE-NBPG)
     54 
     55 /*
     56  * To convert an address in DVMA space to a slave address,
     57  * just use a logical AND with one of the following masks.
     58  * To convert back, just logical OR with the base address.
     59  */
     60 #define DVMA_OBIO_SLAVE_BASE	0xFF000000
     61 #define DVMA_OBIO_SLAVE_MASK	0x00FFffff	/* 16MB */
     62 
     63 #define DVMA_VME_SLAVE_BASE 	0xFFF00000
     64 #define DVMA_VME_SLAVE_MASK 	0x000Fffff	/*  1MB */
     65 
     66 void dvma_init __P((void));
     67 
     68 /* Allocate/free actual pages of DVMA space. */
     69 void * dvma_malloc __P((size_t bytes));
     70 void dvma_free(void *addr, size_t bytes);
     71 
     72 /* Remap/unmap kernel memory in DVMA space. */
     73 void * dvma_mapin __P((void *kva, int len, int canwait));
     74 void dvma_mapout __P((void *dvma_addr, int len));
     75 
     76 /* Convert a kernel DVMA pointer to a slave address. */
     77 u_long dvma_kvtopa __P((void *kva, int bus));
     78 
     79