sys/arch/alpha/tc/tc_sgmap.h

   1 /* $NetBSD: tc_sgmap.h,v 1.2 1997/06/07 00:02:20 thorpej Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
   9  * NASA Ames Research Center.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #define SGMAP_TYPE              tc_sgmap
  34 #define SGMAP_PTE_TYPE          u_int32_t
  35 #define SGMAP_PTE_SPACING       2
  36
  37 /*
  38  * A TurboChannel SGMAP page table entry looks like this:
  39  *
  40  * 31                    23  22  21 20           4 3    0
  41  * |     Discarded     | V | F | P | Page address | UNP |
  42  *
  43  * The page address is bits <29:13> of the physical address of the
  44  * page.  The V bit is set if the PTE holds a valid mapping.
  45  * The F (funny) bit forces a parity error.  The P bit is a
  46  * hardware-generated parity bit.
  47  */
  48 #define SGPTE_PGADDR_SHIFT      9
  49 #define SGPTE_VALID             0x00800000
  50
  51 #include <alpha/common/sgmapvar.h>
  52 #include <alpha/common/sgmap_typedep.h>