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Annotation of sys/arch/alpha/tc/tc_sgmap.h, Revision 1.1.1.1

1.1       nbrk        1: /* $OpenBSD: tc_sgmap.h,v 1.1 2002/05/02 22:56:06 miod Exp $ */
                      2: /* $NetBSD: tc_sgmap.h,v 1.2 1997/06/07 00:02:20 thorpej Exp $ */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1997 The NetBSD Foundation, Inc.
                      6:  * All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to The NetBSD Foundation
                      9:  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
                     10:  * NASA Ames Research Center.
                     11:  *
                     12:  * Redistribution and use in source and binary forms, with or without
                     13:  * modification, are permitted provided that the following conditions
                     14:  * are met:
                     15:  * 1. Redistributions of source code must retain the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer.
                     17:  * 2. Redistributions in binary form must reproduce the above copyright
                     18:  *    notice, this list of conditions and the following disclaimer in the
                     19:  *    documentation and/or other materials provided with the distribution.
                     20:  * 3. All advertising materials mentioning features or use of this software
                     21:  *    must display the following acknowledgement:
                     22:  *     This product includes software developed by the NetBSD
                     23:  *     Foundation, Inc. and its contributors.
                     24:  * 4. Neither the name of The NetBSD Foundation nor the names of its
                     25:  *    contributors may be used to endorse or promote products derived
                     26:  *    from this software without specific prior written permission.
                     27:  *
                     28:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     29:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     30:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     31:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     32:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     33:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     34:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     35:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     36:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     37:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     38:  * POSSIBILITY OF SUCH DAMAGE.
                     39:  */
                     40:
                     41: #define        SGMAP_TYPE              tc_sgmap
                     42: #define        SGMAP_PTE_TYPE          u_int32_t
                     43: #define        SGMAP_PTE_SPACING       2
                     44:
                     45: /*
                     46:  * A TurboChannel SGMAP page table entry looks like this:
                     47:  *
                     48:  * 31                    23  22  21 20           4 3    0
                     49:  * |     Discarded     | V | F | P | Page address | UNP |
                     50:  *
                     51:  * The page address is bits <29:13> of the physical address of the
                     52:  * page.  The V bit is set if the PTE holds a valid mapping.
                     53:  * The F (funny) bit forces a parity error.  The P bit is a
                     54:  * hardware-generated parity bit.
                     55:  */
                     56: #define        SGPTE_PGADDR_SHIFT      9
                     57: #define        SGPTE_VALID             0x00800000
                     58:
                     59: #include <alpha/dev/sgmapvar.h>
                     60: #include <alpha/dev/sgmap_typedep.h>