| 1 | /* $NetBSD: pmap_pv.h,v 1.3 2011/06/12 03:35:50 rmind 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 | union { |
| 69 | /* PP_EMBEDDED */ |
| 70 | struct pv_pte u_pte; |
| 71 | |
| 72 | /* !PP_EMBEDDED */ |
| 73 | struct pv_head { |
| 74 | LIST_HEAD(, pv_entry) pvh_list; |
| 75 | } u_head; |
| 76 | |
| 77 | /* PTPs */ |
| 78 | struct vm_page *u_link; |
| 79 | } pp_u; |
| 80 | #define pp_pte pp_u.u_pte |
| 81 | #define pp_head pp_u.u_head |
| 82 | #define pp_link pp_u.u_link |
| 83 | uint8_t pp_flags; |
| 84 | uint8_t pp_attrs; /* saved PG_M and PG_U */ |
| 85 | }; |
| 86 | |
| 87 | /* pp_flags */ |
| 88 | #define PP_EMBEDDED 1 |
| 89 | |
| 90 | #define PMAP_PAGE_INIT(pp) /* none */ |
| 91 | |
| 92 | #endif /* !_X86_PMAP_PV_H_ */ |
| 93 | |