sys/arch/alpha/include/pte.h

   1 /* $NetBSD: pte.h,v 1.29 2005/12/11 12:16:16 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1998 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 /*
  34  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
  35  * All rights reserved.
  36  *
  37  * Author: Chris G. Demetriou
  38  *
  39  * Permission to use, copy, modify and distribute this software and
  40  * its documentation is hereby granted, provided that both the copyright
  41  * notice and this permission notice appear in all copies of the
  42  * software, derivative works or modified versions, and any portions
  43  * thereof, and that both notices appear in supporting documentation.
  44  *
  45  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  46  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
  47  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  48  *
  49  * Carnegie Mellon requests users of this software to return to
  50  *
  51  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  52  *  School of Computer Science
  53  *  Carnegie Mellon University
  54  *  Pittsburgh PA 15213-3890
  55  *
  56  * any improvements or extensions that they make and grant Carnegie the
  57  * rights to redistribute these changes.
  58  */
  59
  60 #ifndef _ALPHA_PTE_H_
  61 #define _ALPHA_PTE_H_
  62
  63 /*
  64  * Alpha page table entry.
  65  * Things which are in the VMS PALcode but not in the OSF PALcode
  66  * are marked with "(VMS)".
  67  *
  68  * This information derived from pp. (II) 3-3 - (II) 3-6 and
  69  * (III) 3-3 - (III) 3-5 of the "Alpha Architecture Reference Manual" by
  70  * Richard L. Sites.
  71  */
  72
  73 /*
  74  * Alpha Page Table Entry
  75  */
  76
  77 #include <machine/alpha_cpu.h>
  78
  79 typedef alpha_pt_entry_t        pt_entry_t;
  80
  81 #define PTESHIFT        3                       /* pte size == 1 << PTESHIFT */
  82
  83 #define PG_V            ALPHA_PTE_VALID
  84 #define PG_NV           0
  85 #define PG_FOR          ALPHA_PTE_FAULT_ON_READ
  86 #define PG_FOW          ALPHA_PTE_FAULT_ON_WRITE
  87 #define PG_FOE          ALPHA_PTE_FAULT_ON_EXECUTE
  88 #define PG_ASM          ALPHA_PTE_ASM
  89 #define PG_GH           ALPHA_PTE_GRANULARITY
  90 #define PG_KRE          ALPHA_PTE_KR
  91 #define PG_URE          ALPHA_PTE_UR
  92 #define PG_KWE          ALPHA_PTE_KW
  93 #define PG_UWE          ALPHA_PTE_UW
  94 #define PG_PROT         (ALPHA_PTE_PROT | PG_EXEC | PG_FOE)
  95 #define PG_RSVD         0x000000000000cc80      /* Reserved for hardware */
  96 #define PG_WIRED        0x0000000000010000      /* Wired. [SOFTWARE] */
  97 #define PG_PVLIST       0x0000000000020000      /* on pv list [SOFTWARE] */
  98 #define PG_EXEC         0x0000000000040000      /* execute perms [SOFTWARE] */
  99 #define PG_FRAME        ALPHA_PTE_PFN
 100 #define PG_SHIFT        32
 101 #define PG_PFNUM(x)     ALPHA_PTE_TO_PFN(x)
 102
 103 /*
 104  * These are the PALcode PTE bits that we care about when checking to see
 105  * if a PTE has changed in such a way as to require a TBI.
 106  */
 107 #define PG_PALCODE(x)   ((x) & ALPHA_PTE_PALCODE)
 108
 109 #if defined(_KERNEL) || defined(__KVM_ALPHA_PRIVATE)
 110 #define NPTEPG_SHIFT    (PAGE_SHIFT - PTESHIFT)
 111 #define NPTEPG          (1L << NPTEPG_SHIFT)
 112
 113 #define PTEMASK         (NPTEPG - 1)
 114
 115 #define l3pte_index(va) \
 116         (((vaddr_t)(va) >> PAGE_SHIFT) & PTEMASK)
 117
 118 #define l2pte_index(va) \
 119         (((vaddr_t)(va) >> (PAGE_SHIFT + NPTEPG_SHIFT)) & PTEMASK)
 120
 121 #define l1pte_index(va) \
 122         (((vaddr_t)(va) >> (PAGE_SHIFT + 2 * NPTEPG_SHIFT)) & PTEMASK)
 123
 124 #define VPT_INDEX(va)   \
 125         (((vaddr_t)(va) >> PAGE_SHIFT) & ((1 << 3 * NPTEPG_SHIFT) - 1))
 126
 127 /* Space mapped by one level 1 PTE */
 128 #define ALPHA_L1SEG_SIZE        (1L << ((2 * NPTEPG_SHIFT) + PAGE_SHIFT))
 129
 130 /* Space mapped by one level 2 PTE */
 131 #define ALPHA_L2SEG_SIZE        (1L << (NPTEPG_SHIFT + PAGE_SHIFT))
 132
 133 #define alpha_trunc_l1seg(x)    (((u_long)(x)) & ~(ALPHA_L1SEG_SIZE-1))
 134 #define alpha_trunc_l2seg(x)    (((u_long)(x)) & ~(ALPHA_L2SEG_SIZE-1))
 135 #endif /* _KERNEL || __KVM_ALPHA_PRIVATE */
 136
 137 #ifdef _KERNEL
 138 extern  pt_entry_t *kernel_lev1map;     /* kernel level 1 page table */
 139 #endif /* _KERNEL */
 140
 141 #endif /* ! _ALPHA_PTE_H_ */