/* $OpenBSD: dvma.h,v 1.6 1997/01/16 04:04:06 kstailey Exp $ */ /* $NetBSD: dvma.h,v 1.4 1996/11/20 18:57:08 gwr Exp $ */ /*- * Copyright (c) 1996 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Gordon W. Ross. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * DVMA (Direct Virtual Memory Access - like DMA) * * The Sun3 MMU is presented to secondary masters using DVMA. * Before such devices can access kernel memory, that memory * must be mapped into the kernel DVMA space. All DVMA space * is presented as slave-accessible memory for VME and OBIO * devices, though not at the same address seen by the CPU. * * Relevant parts of virtual memory map are: * * 0FE0.0000 monitor map (devices) * 0FF0.0000 DVMA space * 0FFE.0000 monitor RAM seg. * 0FFF.E000 monitor RAM page * * Note that while the DVMA harware makes the last 1MB visible * for secondary masters, the PROM "owns" the last page of it. * Also note that OBIO devices can actually see the last 16MB * of kernel virtual space. That can be mostly ignored, except * when calculating the alias address for slave access. */ /* * To convert an address in DVMA space to a slave address, * just use a logical AND with one of the following masks. * To convert back, just logical OR with the base address. */ #define DVMA_OBIO_SLAVE_BASE 0x0F000000 #define DVMA_OBIO_SLAVE_MASK 0x00FFffff /* 16MB */ #define DVMA_VME_SLAVE_BASE 0x0FF00000 /* 1MB */ #define DVMA_VME_SLAVE_MASK 0x000Fffff /* 1MB */ /* DVMA is the last 1MB, but the PROM gets the last page. */ #define DVMA_SPACE_START 0x0FF00000 #define DVMA_SPACE_END 0x0FFFE000 void dvma_init __P((void)); /* Allocate/free actual pages of DVMA space. */ caddr_t dvma_malloc(size_t bytes); void dvma_free(caddr_t addr, size_t bytes); /* Remap/unmap kernel memory in DVMA space. */ caddr_t dvma_mapin(char *kva, int len); void dvma_mapout(caddr_t dvma_addr, int len); /* Convert a kernel DVMA pointer to a slave address. */ long dvma_kvtopa(long kva, int bus);