1 /* $NetBSD: dvma.h,v 1.7 2008/04/28 20:23:37 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 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 * 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 the same MMU used bu the CPU. 38 * Usually, the virtual space accessed by DVMA devices is a small 39 * sub-range of the CPU virtual space, and that range is known as 40 * DVMA space. 41 */ 42 43 #include <machine/idprom.h> 44 45 /* 46 * Note that while the DVMA harware makes the last 1MB visible 47 * for secondary masters, the PROM "owns" the last page of it. 48 * XXX fredette - is this because of the obio ie SCP? 49 * Also note that OBIO devices can actually see all of 50 * of kernel virtual space. 51 */ 52 #define DVMA_MAP_BASE 0x00F00000 53 #define DVMA_MAP_SIZE_120 0x00040000 54 #define DVMA_MAP_SIZE_50 0x000F8000 55 #define DVMA_MAP_SIZE (cpu_machine_id == ID_SUN2_120 ? DVMA_MAP_SIZE_120 : DVMA_MAP_SIZE_50) 56 #define DVMA_MAP_AVAIL (DVMA_MAP_SIZE-PAGE_SIZE) 57 58 /* 59 * To convert an address in DVMA space to a slave address, 60 * just use a logical AND with one of the following masks. 61 * To convert back, just logical OR with the base address. 62 */ 63 #define DVMA_OBIO_SLAVE_BASE 0x00000000 64 #define DVMA_OBIO_SLAVE_MASK 0x00FFffff /* 16MB */ 65 66 #define DVMA_MBMEM_SLAVE_BASE 0x00F00000 67 #define DVMA_MBMEM_SLAVE_MASK 0x000Fffff /* 1MB */ 68 69 #define DVMA_VME_SLAVE_BASE 0x00F00000 70 #define DVMA_VME_SLAVE_MASK 0x000Fffff /* 1MB */ 71 72