83 lines
3.4 KiB
C
83 lines
3.4 KiB
C
/* $NetBSD: dvma3.h,v 1.3 1996/02/20 22:06:28 gwr Exp $ */
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/*
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* Copyright (c) 1995 Gordon W. Ross
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* All rights reserved.
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* 4. 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 Gordon W. Ross
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* DVMA (Direct Virtual Memory Access - like DMA)
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*
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* The Sun3 MMU is presented to secondary masters using DVMA.
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* Before such devices can access kernel memory, that memory
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* must be mapped into the kernel DVMA space. All DVMA space
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* is presented as slave-accessible memory for VME and OBIO
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* devices, though not at the same address seen by the CPU.
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*
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* Relevant parts of virtual memory map are:
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*
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* 0FE0.0000 monitor map (devices)
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* 0FF0.0000 DVMA space
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* 0FFE.0000 monitor RAM seg.
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* 0FFF.E000 monitor RAM page
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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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* Also note that OBIO devices can actually see the last 16MB
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* of kernel virtual space. That can be mostly ignored, except
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* when calculating the alias address for slave access.
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*/
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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_VME_SLAVE_BASE 0x0FF00000 /* 1MB */
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#define DVMA_VME_SLAVE_MASK 0x000Fffff /* 1MB */
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/* DVMA is the last 1MB, but the PROM gets the last page. */
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#define DVMA_SPACE_START 0x0FF00000
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#define DVMA_SPACE_END 0x0FFFE000
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/* Allocate/free actual pages of DVMA space. */
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caddr_t dvma_malloc(size_t bytes);
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void dvma_free(caddr_t addr, size_t bytes);
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/* Remap/unmap kernel memory in DVMA space. */
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caddr_t dvma_mapin(char *kva, int len);
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void dvma_mapout(caddr_t dvma_addr, int len);
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/* Convert a kernel DVMA pointer to a slave address. */
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long dvma_kvtopa(long kva, int bus);
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