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      1 /*	$NetBSD: dvma.h,v 1.8 2024/07/20 20:36:33 andvar 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 hardware 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