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      1 /*	$NetBSD: dvma.h,v 1.13 2008/04/28 20:23:38 martin 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * DVMA (Direct Virtual Memory Access)
     34  *
     35  * For the unfamiliar, this is just DMA where the device doing DMA
     36  * operates in a virtual address space.  The virtual to physical
     37  * translations are controlled by some sort of I/O MMU, which may
     38  * be the same used by the CPU (sun3) or not (sun3x).  Usually, the
     39  * virtual space accessed by DVMA devices is a small sub-range of
     40  * the CPU virtual space, and that range is known as DVMA space.
     41  */
     42 
     43 #ifdef	_SUN3_
     44 #include <machine/dvma3.h>
     45 #endif	/* SUN3 */
     46 #ifdef	_SUN3X_
     47 #include <machine/dvma3x.h>
     48 #endif	/* SUN3X */
     49 
     50 void dvma_init(void);
     51 
     52 /* Allocate/free actual pages of DVMA space. */
     53 void *dvma_malloc(size_t);
     54 void dvma_free(void *, size_t);
     55 
     56 /* Remap/unmap kernel memory in DVMA space. */
     57 void *dvma_mapin(void *, int, int);
     58 void dvma_mapout(void *, int);
     59 
     60 /* Convert a kernel DVMA pointer to a slave address. */
     61 u_long dvma_kvtopa(void *, int);
     62 
     63