1 /* $NetBSD: pmap_pv.h,v 1.17 2020/03/17 22:29:19 ad 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 #include <sys/rbtree.h> 35 36 struct vm_page; 37 struct pmap_page; 38 39 /* 40 * structures to track P->V mapping 41 * 42 * this file is intended to be minimum as it's included by <machine/vmparam.h>. 43 */ 44 45 /* 46 * pv_pte: describe a pte 47 */ 48 49 struct pv_pte { 50 struct vm_page *pte_ptp; /* PTP; NULL for pmap_kernel() */ 51 vaddr_t pte_va; /* VA */ 52 }; 53 54 /* 55 * pv_entry: plug pv_pte into lists. 32 bytes on i386, 64 on amd64. 56 */ 57 58 struct pv_entry { 59 struct pv_pte pve_pte; /* should be the first member */ 60 LIST_ENTRY(pv_entry) pve_list; /* on pmap_page::pp_pvlist */ 61 rb_node_t pve_rb; /* red-black tree node */ 62 struct pmap_page *pve_pp; /* backpointer to mapped page */ 63 }; 64 #define pve_next pve_list.le_next 65 66 /* 67 * pmap_page: a structure which is embedded in each vm_page. 68 */ 69 70 struct pmap_page { 71 union { 72 /* PTPs */ 73 rb_tree_t rb; 74 75 /* PTPs, when being freed */ 76 LIST_ENTRY(vm_page) link; 77 78 /* Non-PTPs (i.e. normal pages) */ 79 struct { 80 struct pv_pte pte; 81 LIST_HEAD(, pv_entry) pvlist; 82 uint8_t attrs; 83 } s; 84 } pp_u; 85 kmutex_t pp_lock; 86 #define pp_rb pp_u.rb 87 #define pp_link pp_u.link 88 #define pp_pte pp_u.s.pte 89 #define pp_pvlist pp_u.s.pvlist 90 #define pp_attrs pp_u.s.attrs 91 }; 92 93 #define PP_ATTRS_D 0x01 /* Dirty */ 94 #define PP_ATTRS_A 0x02 /* Accessed */ 95 #define PP_ATTRS_W 0x04 /* Writable */ 96 97 #define PMAP_PAGE_INIT(pp) \ 98 do { \ 99 LIST_INIT(&(pp)->pp_pvlist); \ 100 mutex_init(&(pp)->pp_lock, MUTEX_NODEBUG, IPL_VM); \ 101 } while (/* CONSTCOND */ 0); 102 103 #endif /* !_X86_PMAP_PV_H_ */ 104