pmap.h revision 1.12
1/* $NetBSD: pmap.h,v 1.12 1998/03/26 02:53:21 thorpej 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 and by Chris G. Demetriou. 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40/* 41 * Copyright (c) 1987 Carnegie-Mellon University 42 * Copyright (c) 1991, 1993 43 * The Regents of the University of California. All rights reserved. 44 * 45 * This code is derived from software contributed to Berkeley by 46 * the Systems Programming Group of the University of Utah Computer 47 * Science Department. 48 * 49 * Redistribution and use in source and binary forms, with or without 50 * modification, are permitted provided that the following conditions 51 * are met: 52 * 1. Redistributions of source code must retain the above copyright 53 * notice, this list of conditions and the following disclaimer. 54 * 2. Redistributions in binary form must reproduce the above copyright 55 * notice, this list of conditions and the following disclaimer in the 56 * documentation and/or other materials provided with the distribution. 57 * 3. All advertising materials mentioning features or use of this software 58 * must display the following acknowledgement: 59 * This product includes software developed by the University of 60 * California, Berkeley and its contributors. 61 * 4. Neither the name of the University nor the names of its contributors 62 * may be used to endorse or promote products derived from this software 63 * without specific prior written permission. 64 * 65 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 66 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 67 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 68 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 69 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 70 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 71 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 72 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 73 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 74 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 75 * SUCH DAMAGE. 76 * 77 * @(#)pmap.h 8.1 (Berkeley) 6/10/93 78 */ 79 80#ifndef _PMAP_MACHINE_ 81#define _PMAP_MACHINE_ 82 83#include <sys/queue.h> 84#include <machine/pte.h> 85 86/* 87 * Machine-dependent virtual memory state. 88 * 89 * If we ever support processor numbers higher than 63, we'll have to 90 * rethink the CPU mask. 91 * 92 * XXX When we support multiple processors, pm_asn and pm_asngen need 93 * XXX to be per-processor. 94 */ 95struct pmap { 96 LIST_ENTRY(pmap) pm_list; /* list of all pmaps */ 97 pt_entry_t *pm_lev1map; /* level 1 map */ 98 int pm_count; /* pmap reference count */ 99 simple_lock_data_t pm_lock; /* lock on pmap */ 100 struct pmap_statistics pm_stats; /* pmap statistics */ 101 long pm_nlev2; /* level 2 pt page count */ 102 long pm_nlev3; /* level 3 pt page count */ 103 unsigned int pm_asn; /* address space number */ 104 unsigned long pm_asngen; /* ASN generation number */ 105 unsigned long pm_cpus; /* mask of CPUs using pmap */ 106}; 107 108typedef struct pmap *pmap_t; 109 110#define PMAP_ASN_RESERVED 0 /* reserved for Lev1map users */ 111 112extern struct pmap kernel_pmap_store; 113 114#define pmap_kernel() (&kernel_pmap_store) 115 116/* 117 * For each vm_page_t, there is a list of all currently valid virtual 118 * mappings of that page. An entry is a pv_entry_t, the list is pv_table. 119 */ 120typedef struct pv_entry { 121 LIST_ENTRY(pv_entry) pv_list; /* pv_entry list */ 122 struct pmap *pv_pmap; /* pmap where mapping lies */ 123 vm_offset_t pv_va; /* virtual address for mapping */ 124} *pv_entry_t; 125 126/* 127 * The head of the list of pv_entry_t's, also contains page attributes. 128 */ 129struct pv_head { 130 LIST_HEAD(, pv_entry) pvh_list; /* pv_entry list */ 131 int pvh_attrs; /* page attributes */ 132 int pvh_ptref; /* ref count if PT page */ 133}; 134 135/* pvh_attrs */ 136#define PMAP_ATTR_MOD 0x01 /* modified */ 137#define PMAP_ATTR_REF 0x02 /* referenced */ 138#define PMAP_ATTR_PTPAGE 0x04 /* is a page table page */ 139 140struct pv_page_info { 141 TAILQ_ENTRY(pv_page) pgi_list; 142 LIST_HEAD(, pv_entry) pgi_freelist; 143 int pgi_nfree; 144}; 145 146#define NPVPPG ((NBPG - sizeof(struct pv_page_info)) / sizeof(struct pv_entry)) 147 148struct pv_page { 149 struct pv_page_info pvp_pgi; 150 struct pv_entry pvp_pv[NPVPPG]; 151}; 152 153#ifdef _KERNEL 154 155#ifndef _LKM 156#include "opt_new_scc_driver.h" 157#include "opt_dec_3000_300.h" /* XXX */ 158#include "opt_dec_3000_500.h" /* XXX */ 159#include "opt_dec_kn8ae.h" /* XXX */ 160 161#if defined(NEW_SCC_DRIVER) 162#if defined(DEC_KN8AE) 163#define _PMAP_MAY_USE_PROM_CONSOLE 164#endif 165#else /* ! NEW_SCC_DRIVER */ 166#if defined(DEC_3000_300) \ 167 || defined(DEC_3000_500) \ 168 || defined(DEC_KN8AE) /* XXX */ 169#define _PMAP_MAY_USE_PROM_CONSOLE /* XXX */ 170#endif /* XXX */ 171#endif /* NEW_SCC_DRIVER */ 172#endif /* _LKM */ 173 174#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count) 175#define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count) 176 177extern pt_entry_t *VPT; /* Virtual Page Table */ 178 179#define PMAP_STEAL_MEMORY /* enable pmap_steal_memory() */ 180 181vm_offset_t vtophys __P((vm_offset_t)); 182 183/* Machine-specific functions. */ 184void pmap_bootstrap __P((vm_offset_t ptaddr, u_int maxasn)); 185void pmap_emulate_reference __P((struct proc *p, vm_offset_t v, 186 int user, int write)); 187#ifdef _PMAP_MAY_USE_PROM_CONSOLE 188int pmap_uses_prom_console __P((void)); 189#endif 190 191#define pmap_pte_pa(pte) (PG_PFNUM(*(pte)) << PGSHIFT) 192#define pmap_pte_prot(pte) (*(pte) & PG_PROT) 193#define pmap_pte_w(pte) (*(pte) & PG_WIRED) 194#define pmap_pte_v(pte) (*(pte) & PG_V) 195#define pmap_pte_pv(pte) (*(pte) & PG_PVLIST) 196#define pmap_pte_asm(pte) (*(pte) & PG_ASM) 197 198#define pmap_pte_set_w(pte, v) \ 199do { \ 200 if (v) \ 201 *(pte) |= PG_WIRED; \ 202 else \ 203 *(pte) &= ~PG_WIRED; \ 204} while (0) 205 206#define pmap_pte_w_chg(pte, nw) ((nw) ^ pmap_pte_w(pte)) 207 208#define pmap_pte_set_prot(pte, np) \ 209do { \ 210 *(pte) &= ~PG_PROT; \ 211 *(pte) |= (np); \ 212} while (0) 213 214#define pmap_pte_prot_chg(pte, np) ((np) ^ pmap_pte_prot(pte)) 215 216static __inline pt_entry_t *pmap_l2pte __P((pmap_t, vm_offset_t)); 217static __inline pt_entry_t *pmap_l3pte __P((pmap_t, vm_offset_t)); 218 219#define pmap_l1pte(pmap, v) \ 220 (&(pmap)->pm_lev1map[l1pte_index((vm_offset_t)(v))]) 221 222static __inline pt_entry_t * 223pmap_l2pte(pmap, v) 224 pmap_t pmap; 225 vm_offset_t v; 226{ 227 pt_entry_t *l1pte, *lev2map; 228 229 l1pte = pmap_l1pte(pmap, v); 230 if (pmap_pte_v(l1pte) == 0) 231 return (NULL); 232 233 lev2map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l1pte)); 234 return (&lev2map[l2pte_index(v)]); 235} 236 237static __inline pt_entry_t * 238pmap_l3pte(pmap, v) 239 pmap_t pmap; 240 vm_offset_t v; 241{ 242 pt_entry_t *l1pte, *lev2map, *l2pte, *lev3map; 243 244 l1pte = pmap_l1pte(pmap, v); 245 if (pmap_pte_v(l1pte) == 0) 246 return (NULL); 247 248 lev2map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l1pte)); 249 l2pte = &lev2map[l2pte_index(v)]; 250 if (pmap_pte_v(l2pte) == 0) 251 return (NULL); 252 253 lev3map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l2pte)); 254 return (&lev3map[l3pte_index(v)]); 255} 256 257#endif /* _KERNEL */ 258 259#endif /* _PMAP_MACHINE_ */ 260