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