sys/arch/x86/include/pmap_pv.h

   1 /*      $NetBSD: pmap_pv.h,v 1.1 2008/01/20 13:43:38 yamt Exp $ */
   2
   3 /*-
   4  * Copyright (c)2008 YAMAMOTO Takashi,
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #ifndef _X86_PMAP_PV_H_
  30 #define _X86_PMAP_PV_H_
  31
  32 #include <sys/mutex.h>
  33 #include <sys/queue.h>
  34
  35 struct vm_page;
  36
  37 /*
  38  * structures to track P->V mapping
  39  *
  40  * this file is intended to be minimum as it's included by <machine/vmparam.h>.
  41  */
  42
  43 /*
  44  * pv_pte: describe a pte
  45  */
  46
  47 struct pv_pte {
  48         struct vm_page *pte_ptp;        /* PTP; NULL for pmap_kernel() */
  49         vaddr_t pte_va;                 /* VA */
  50 };
  51
  52 /*
  53  * pv_entry: plug pv_pte into lists.
  54  */
  55
  56 struct pv_entry {
  57         struct pv_pte pve_pte;          /* should be the first member */
  58         LIST_ENTRY(pv_entry) pve_list;  /* on pv_head::pvh_list */
  59         SLIST_ENTRY(pv_entry) pve_hash;
  60 };
  61 #define pve_next        pve_list.le_next
  62
  63 /*
  64  * pmap_page: a structure which is embedded in each vm_page.
  65  */
  66
  67 struct pmap_page {
  68         kmutex_t pp_lock;
  69         union {
  70                 /* PP_EMBEDDED */
  71                 struct pv_pte u_pte;
  72
  73                 /* !PP_EMBEDDED */
  74                 struct pv_head {
  75                         LIST_HEAD(, pv_entry) pvh_list;
  76                 } u_head;
  77
  78                 /* PTPs */
  79                 struct vm_page *u_link;
  80         } pp_u;
  81 #define pp_pte  pp_u.u_pte
  82 #define pp_head pp_u.u_head
  83 #define pp_link pp_u.u_link
  84         uint8_t pp_flags;
  85         uint8_t pp_attrs;       /* saved PG_M and PG_U */
  86 };
  87
  88 /* pp_flags */
  89 #define PP_EMBEDDED     1
  90
  91 #define PMAP_PAGE_INIT(pp) \
  92         mutex_init(&(pp)->pp_lock, MUTEX_NODEBUG, IPL_VM)
  93
  94 #endif /* !_X86_PMAP_PV_H_ */