NetBSD/sys/arch/sun2/include/dvma.h

79 lines
3.4 KiB
C

/* $NetBSD: dvma.h,v 1.3 2001/06/14 13:17:04 fredette 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 and Matthew Fredette.
*
* 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 FOUNDATION 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)
*
* For the unfamiliar, this is just DMA where the device doing DMA
* operates in a virtual address space. The virtual to physical
* translations are controlled by the same MMU used bu the CPU.
* Usually, the virtual space accessed by DVMA devices is a small
* sub-range of the CPU virtual space, and that range is known as
* DVMA space.
*/
#include <machine/idprom.h>
/*
* Note that while the DVMA harware makes the last 1MB visible
* for secondary masters, the PROM "owns" the last page of it.
* XXX fredette - is this because of the obio ie SCP?
* Also note that OBIO devices can actually see all of
* of kernel virtual space.
*/
#define DVMA_MAP_BASE 0x00F00000
#define DVMA_MAP_SIZE_120 0x00040000
#define DVMA_MAP_SIZE_50 0x000F8000
#define DVMA_MAP_SIZE (cpu_machine_id == SUN2_MACH_120 ? DVMA_MAP_SIZE_120 : DVMA_MAP_SIZE_50)
#define DVMA_MAP_AVAIL (DVMA_MAP_SIZE-NBPG)
/*
* 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 0x00000000
#define DVMA_OBIO_SLAVE_MASK 0x00FFffff /* 16MB */
#define DVMA_MBMEM_SLAVE_BASE 0x00F00000
#define DVMA_MBMEM_SLAVE_MASK 0x000Fffff /* 1MB */
#define DVMA_VME_SLAVE_BASE 0x00F00000
#define DVMA_VME_SLAVE_MASK 0x000Fffff /* 1MB */