90 lines
3.7 KiB
C
90 lines
3.7 KiB
C
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/* $NetBSD: dvma.h,v 1.1 2001/03/29 04:41:13 fredette Exp $ */
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/*-
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* Copyright (c) 1996 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Gordon W. Ross and Matthew Fredette.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* DVMA (Direct Virtual Memory Access)
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*
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* For the unfamiliar, this is just DMA where the device doing DMA
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* operates in a virtual address space. The virtual to physical
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* translations are controlled by the same MMU used bu the CPU.
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* Usually, the virtual space accessed by DVMA devices is a small
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* sub-range of the CPU virtual space, and that range is known as
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* DVMA space.
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*/
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/*
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* Note that while the DVMA harware makes the last 1MB visible
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* for secondary masters, the PROM "owns" the last page of it.
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* XXX fredette - is this because of the obio ie SCP?
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* Also note that OBIO devices can actually see all of
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* of kernel virtual space.
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*/
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/* XXX fredette - the MAP_SIZE value is for the 2/120; the
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2/50 can have a MAP_SIZE of 0x000F8000: */
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#define DVMA_MAP_BASE 0x00F00000
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#define DVMA_MAP_SIZE 0x00040000
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#define DVMA_MAP_AVAIL (DVMA_MAP_SIZE-NBPG)
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/*
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* To convert an address in DVMA space to a slave address,
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* just use a logical AND with one of the following masks.
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* To convert back, just logical OR with the base address.
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*/
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#define DVMA_OBIO_SLAVE_BASE 0x0F000000
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#define DVMA_OBIO_SLAVE_MASK 0x00FFffff /* 16MB */
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#define DVMA_MBMEM_SLAVE_BASE 0x00F00000
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#define DVMA_MBMEM_SLAVE_MASK 0x000Fffff /* 1MB */
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#define DVMA_VME_SLAVE_BASE 0x00F00000
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#define DVMA_VME_SLAVE_MASK 0x000Fffff /* 1MB */
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void dvma_init __P((void));
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/* Allocate/free actual pages of DVMA space. */
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void * dvma_malloc __P((size_t bytes));
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void dvma_free(void *addr, size_t bytes);
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/* Remap/unmap kernel memory in DVMA space. */
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void * dvma_mapin __P((void *kva, int len, int canwait));
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void dvma_mapout __P((void *dvma_addr, int len));
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/* Convert a kernel DVMA pointer to a slave address. */
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u_long dvma_kvtopa __P((void *kva, int bus));
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