sys/arch/sun2/include/dvma.h

   1 /*      $NetBSD: dvma.h,v 1.6 2005/12/11 12:19:16 christos 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 harware 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