1 /* $NetBSD: dvma.h,v 1.9 1998/02/05 04:56:50 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) 41 * 42 * For the unfamiliar, this is just DMA where the device doing DMA 43 * operates in a virtual address space. The virtual to physical 44 * translations are controlled by some sort of I/O MMU, which may 45 * be the same used by the CPU (sun3) or not (sun3x). Usually, the 46 * virtual space accessed by DVMA devices is a small sub-range of 47 * the CPU virtual space, and that range is known as DVMA space. 48 */ 49 50 #ifdef _SUN3_ 51 #include <machine/dvma3.h> 52 #endif /* SUN3 */ 53 #ifdef _SUN3X_ 54 #include <machine/dvma3x.h> 55 #endif /* SUN3X */ 56 57 void dvma_init __P((void)); 58 59 /* Allocate/free actual pages of DVMA space. */ 60 void * dvma_malloc __P((size_t bytes)); 61 void dvma_free(void *addr, size_t bytes); 62 63 /* Remap/unmap kernel memory in DVMA space. */ 64 void * dvma_mapin __P((void *kva, int len, int canwait)); 65 void dvma_mapout __P((void *dvma_addr, int len)); 66 67 /* Convert a kernel DVMA pointer to a slave address. */ 68 u_long dvma_kvtopa __P((void *kva, int bus)); 69 70