vmpagemd.h revision 1.10
1 /* $NetBSD: vmpagemd.h,v 1.10 2019/06/19 10:04:40 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Raytheon BBN Technologies Corp and Defense Advanced Research Projects 9 * Agency and which was developed by Matt Thomas of 3am Software Foundry. 10 * 11 * This material is based upon work supported by the Defense Advanced Research 12 * Projects Agency and Space and Naval Warfare Systems Center, Pacific, under 13 * Contract No. N66001-09-C-2073. 14 * Approved for Public Release, Distribution Unlimited 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #ifndef _UVM_PMAP_VMPAGEMD_H_ 39 #define _UVM_PMAP_VMPAGEMD_H_ 40 41 #ifdef _LOCORE 42 #error use assym.h instead 43 #endif 44 45 //#ifdef _MODULE 46 //#error this file should not be included by loadable kernel modules 47 //#endif 48 49 #ifdef _KERNEL_OPT 50 #include "opt_modular.h" 51 #include "opt_multiprocessor.h" 52 #endif 53 54 #include <sys/atomic.h> 55 #include <sys/mutex.h> 56 57 #define __HAVE_VM_PAGE_MD 58 59 typedef struct pv_entry { 60 struct pv_entry *pv_next; 61 struct pmap *pv_pmap; 62 vaddr_t pv_va; 63 #define PV_KENTER __BIT(0) 64 } *pv_entry_t; 65 66 #ifndef _MODULE 67 68 #define VM_PAGEMD_REFERENCED __BIT(0) /* page has been referenced */ 69 #define VM_PAGEMD_MODIFIED __BIT(1) /* page has been modified */ 70 #define VM_PAGEMD_POOLPAGE __BIT(2) /* page is used as a poolpage */ 71 #define VM_PAGEMD_EXECPAGE __BIT(3) /* page is exec mapped */ 72 #ifdef PMAP_VIRTUAL_CACHE_ALIASES 73 #define VM_PAGEMD_UNCACHED __BIT(4) /* page is mapped uncached */ 74 #endif 75 76 #ifdef PMAP_VIRTUAL_CACHE_ALIASES 77 #define VM_PAGEMD_CACHED_P(mdpg) (((mdpg)->mdpg_attrs & VM_PAGEMD_UNCACHED) == 0) 78 #define VM_PAGEMD_UNCACHED_P(mdpg) (((mdpg)->mdpg_attrs & VM_PAGEMD_UNCACHED) != 0) 79 #endif 80 #define VM_PAGEMD_MODIFIED_P(mdpg) (((mdpg)->mdpg_attrs & VM_PAGEMD_MODIFIED) != 0) 81 #define VM_PAGEMD_REFERENCED_P(mdpg) (((mdpg)->mdpg_attrs & VM_PAGEMD_REFERENCED) != 0) 82 #define VM_PAGEMD_POOLPAGE_P(mdpg) (((mdpg)->mdpg_attrs & VM_PAGEMD_POOLPAGE) != 0) 83 #define VM_PAGEMD_EXECPAGE_P(mdpg) (((mdpg)->mdpg_attrs & VM_PAGEMD_EXECPAGE) != 0) 84 85 #endif /* !_MODULE */ 86 87 struct vm_page_md { 88 volatile unsigned long mdpg_attrs; /* page attributes */ 89 struct pv_entry mdpg_first; /* pv_entry first */ 90 #if defined(MULTIPROCESSOR) || defined(MODULAR) || defined(_MODULE) 91 kmutex_t *mdpg_lock; /* pv list lock */ 92 #endif 93 }; 94 95 #ifndef _MODULE 96 #if defined(MULTIPROCESSOR) || defined(MODULAR) 97 #define VM_PAGEMD_PVLIST_LOCK_INIT(mdpg) (mdpg)->mdpg_lock = NULL 98 #else 99 #define VM_PAGEMD_PVLIST_LOCK_INIT(mdpg) do { } while (/*CONSTCOND*/ 0) 100 #endif /* MULTIPROCESSOR || MODULAR */ 101 102 #define VM_PAGEMD_PVLIST_LOCK(mdpg) pmap_pvlist_lock(mdpg, 1) 103 #define VM_PAGEMD_PVLIST_READLOCK(mdpg) pmap_pvlist_lock(mdpg, 0) 104 #define VM_PAGEMD_PVLIST_UNLOCK(mdpg) pmap_pvlist_unlock(mdpg) 105 #define VM_PAGEMD_PVLIST_LOCKED_P(mdpg) pmap_pvlist_locked_p(mdpg) 106 #define VM_PAGEMD_PVLIST_GEN(mdpg) ((mdpg)->mdpg_attrs >> 16) 107 108 #ifdef _KERNEL 109 #if defined(MULTIPROCESSOR) || defined(MODULAR) 110 kmutex_t *pmap_pvlist_lock_addr(struct vm_page_md *); 111 #else 112 extern kmutex_t pmap_pvlist_mutex; 113 static __inline kmutex_t * 114 pmap_pvlist_lock_addr(struct vm_page_md *mdpg) 115 { 116 return &pmap_pvlist_mutex; 117 } 118 #endif 119 120 static __inline uintptr_t 121 pmap_pvlist_lock(struct vm_page_md *mdpg, uintptr_t increment) 122 { 123 mutex_spin_enter(pmap_pvlist_lock_addr(mdpg)); 124 const uintptr_t gen = VM_PAGEMD_PVLIST_GEN(mdpg); 125 mdpg->mdpg_attrs += increment << 16; 126 return gen; 127 } 128 129 static __inline uintptr_t 130 pmap_pvlist_unlock(struct vm_page_md *mdpg) 131 { 132 const uintptr_t gen = VM_PAGEMD_PVLIST_GEN(mdpg); 133 mutex_spin_exit(pmap_pvlist_lock_addr(mdpg)); 134 return gen; 135 } 136 137 static __inline bool 138 pmap_pvlist_locked_p(struct vm_page_md *mdpg) 139 { 140 return mutex_owned(pmap_pvlist_lock_addr(mdpg)); 141 } 142 #endif /* _KERNEL */ 143 144 #define VM_MDPAGE_INIT(pg) \ 145 do { \ 146 (pg)->mdpage.mdpg_first.pv_next = NULL; \ 147 (pg)->mdpage.mdpg_first.pv_pmap = NULL; \ 148 (pg)->mdpage.mdpg_first.pv_va = (pg)->phys_addr; \ 149 (pg)->mdpage.mdpg_attrs = 0; \ 150 VM_PAGEMD_PVLIST_LOCK_INIT(&(pg)->mdpage); \ 151 } while (/* CONSTCOND */ 0) 152 153 #endif /* _MODULE */ 154 155 #endif /* _UVM_PMAP_VMPAGEMD_H_ */ 156
Indexes created Tue Sep 30 20:09:53 GMT 2025