1 /* $NetBSD: dvma.h,v 1.6 2005/12/11 12:19:16 christos 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 and Matthew Fredette. 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 the same MMU used bu the CPU. 45 * Usually, the virtual space accessed by DVMA devices is a small 46 * sub-range of the CPU virtual space, and that range is known as 47 * DVMA space. 48 */ 49 50 #include <machine/idprom.h> 51 52 /* 53 * Note that while the DVMA harware makes the last 1MB visible 54 * for secondary masters, the PROM "owns" the last page of it. 55 * XXX fredette - is this because of the obio ie SCP? 56 * Also note that OBIO devices can actually see all of 57 * of kernel virtual space. 58 */ 59 #define DVMA_MAP_BASE 0x00F00000 60 #define DVMA_MAP_SIZE_120 0x00040000 61 #define DVMA_MAP_SIZE_50 0x000F8000 62 #define DVMA_MAP_SIZE (cpu_machine_id == ID_SUN2_120 ? DVMA_MAP_SIZE_120 : DVMA_MAP_SIZE_50) 63 #define DVMA_MAP_AVAIL (DVMA_MAP_SIZE-PAGE_SIZE) 64 65 /* 66 * To convert an address in DVMA space to a slave address, 67 * just use a logical AND with one of the following masks. 68 * To convert back, just logical OR with the base address. 69 */ 70 #define DVMA_OBIO_SLAVE_BASE 0x00000000 71 #define DVMA_OBIO_SLAVE_MASK 0x00FFffff /* 16MB */ 72 73 #define DVMA_MBMEM_SLAVE_BASE 0x00F00000 74 #define DVMA_MBMEM_SLAVE_MASK 0x000Fffff /* 1MB */ 75 76 #define DVMA_VME_SLAVE_BASE 0x00F00000 77 #define DVMA_VME_SLAVE_MASK 0x000Fffff /* 1MB */ 78 79