pmap.h revision 1.77
1/* $NetBSD: pmap.h,v 1.77 2012/02/06 02:14:13 matt Exp $ */ 2 3/*- 4 * Copyright (c) 1998, 1999, 2000, 2001, 2007 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33/* 34 * Copyright (c) 1991, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * This code is derived from software contributed to Berkeley by 38 * the Systems Programming Group of the University of Utah Computer 39 * Science Department. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)pmap.h 8.1 (Berkeley) 6/10/93 66 */ 67 68/* 69 * Copyright (c) 1987 Carnegie-Mellon University 70 * 71 * This code is derived from software contributed to Berkeley by 72 * the Systems Programming Group of the University of Utah Computer 73 * Science Department. 74 * 75 * Redistribution and use in source and binary forms, with or without 76 * modification, are permitted provided that the following conditions 77 * are met: 78 * 1. Redistributions of source code must retain the above copyright 79 * notice, this list of conditions and the following disclaimer. 80 * 2. Redistributions in binary form must reproduce the above copyright 81 * notice, this list of conditions and the following disclaimer in the 82 * documentation and/or other materials provided with the distribution. 83 * 3. All advertising materials mentioning features or use of this software 84 * must display the following acknowledgement: 85 * This product includes software developed by the University of 86 * California, Berkeley and its contributors. 87 * 4. Neither the name of the University nor the names of its contributors 88 * may be used to endorse or promote products derived from this software 89 * without specific prior written permission. 90 * 91 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 92 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 94 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 95 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 96 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 97 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 98 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 99 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 100 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 101 * SUCH DAMAGE. 102 * 103 * @(#)pmap.h 8.1 (Berkeley) 6/10/93 104 */ 105 106#ifndef _PMAP_MACHINE_ 107#define _PMAP_MACHINE_ 108 109#if defined(_KERNEL_OPT) 110#include "opt_multiprocessor.h" 111#endif 112 113#include <sys/mutex.h> 114#include <sys/queue.h> 115 116#include <machine/pte.h> 117 118/* 119 * Machine-dependent virtual memory state. 120 * 121 * If we ever support processor numbers higher than 63, we'll have to 122 * rethink the CPU mask. 123 * 124 * Note pm_asn and pm_asngen are arrays allocated in pmap_create(). 125 * Their size is based on the PCS count from the HWRPB, and indexed 126 * by processor ID (from `whami'). 127 * 128 * The kernel pmap is a special case; it gets statically-allocated 129 * arrays which hold enough for ALPHA_MAXPROCS. 130 */ 131struct pmap_asn_info { 132 unsigned int pma_asn; /* address space number */ 133 unsigned long pma_asngen; /* ASN generation number */ 134}; 135 136struct pmap { 137 TAILQ_ENTRY(pmap) pm_list; /* list of all pmaps */ 138 pt_entry_t *pm_lev1map; /* level 1 map */ 139 int pm_count; /* pmap reference count */ 140 kmutex_t pm_lock; /* lock on pmap */ 141 struct pmap_statistics pm_stats; /* pmap statistics */ 142 unsigned long pm_cpus; /* mask of CPUs using pmap */ 143 unsigned long pm_needisync; /* mask of CPUs needing isync */ 144 struct pmap_asn_info pm_asni[1]; /* ASN information */ 145 /* variable length */ 146}; 147 148/* 149 * Compute the sizeof of a pmap structure. Subtract one because one 150 * ASN info structure is already included in the pmap structure itself. 151 */ 152#define PMAP_SIZEOF(x) \ 153 (ALIGN(sizeof(struct pmap) + \ 154 (sizeof(struct pmap_asn_info) * ((x) - 1)))) 155 156#define PMAP_ASN_RESERVED 0 /* reserved for Lev1map users */ 157 158/* 159 * For each struct vm_page, there is a list of all currently valid virtual 160 * mappings of that page. An entry is a pv_entry_t, the list is pv_table. 161 */ 162typedef struct pv_entry { 163 struct pv_entry *pv_next; /* next pv_entry on list */ 164 struct pmap *pv_pmap; /* pmap where mapping lies */ 165 vaddr_t pv_va; /* virtual address for mapping */ 166 pt_entry_t *pv_pte; /* PTE that maps the VA */ 167} *pv_entry_t; 168 169/* pvh_attrs */ 170#define PGA_MODIFIED 0x01 /* modified */ 171#define PGA_REFERENCED 0x02 /* referenced */ 172 173/* pvh_usage */ 174#define PGU_NORMAL 0 /* free or normal use */ 175#define PGU_PVENT 1 /* PV entries */ 176#define PGU_L1PT 2 /* level 1 page table */ 177#define PGU_L2PT 3 /* level 2 page table */ 178#define PGU_L3PT 4 /* level 3 page table */ 179 180#ifdef _KERNEL 181 182#include <sys/atomic.h> 183 184#ifdef _KERNEL_OPT 185#include "opt_dec_kn8ae.h" /* XXX */ 186#if defined(DEC_KN8AE) 187#define _PMAP_MAY_USE_PROM_CONSOLE 188#endif 189#else 190#define _PMAP_MAY_USE_PROM_CONSOLE 191#endif 192 193#ifndef _LKM 194#if defined(MULTIPROCESSOR) 195struct cpu_info; 196struct trapframe; 197 198void pmap_tlb_shootdown(pmap_t, vaddr_t, pt_entry_t, u_long *); 199void pmap_tlb_shootnow(u_long); 200void pmap_do_tlb_shootdown(struct cpu_info *, struct trapframe *); 201#define PMAP_TLB_SHOOTDOWN_CPUSET_DECL u_long shootset = 0; 202#define PMAP_TLB_SHOOTDOWN(pm, va, pte) \ 203 pmap_tlb_shootdown((pm), (va), (pte), &shootset) 204#define PMAP_TLB_SHOOTNOW() \ 205 pmap_tlb_shootnow(shootset) 206#else 207#define PMAP_TLB_SHOOTDOWN_CPUSET_DECL /* nothing */ 208#define PMAP_TLB_SHOOTDOWN(pm, va, pte) /* nothing */ 209#define PMAP_TLB_SHOOTNOW() /* nothing */ 210#endif /* MULTIPROCESSOR */ 211#endif /* _LKM */ 212 213#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count) 214#define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count) 215 216#define pmap_copy(dp, sp, da, l, sa) /* nothing */ 217#define pmap_update(pmap) /* nothing (yet) */ 218 219static __inline void 220pmap_remove_all(struct pmap *pmap) 221{ 222 /* Nothing. */ 223} 224 225#define pmap_is_referenced(pg) \ 226 (((pg)->mdpage.pvh_attrs & PGA_REFERENCED) != 0) 227#define pmap_is_modified(pg) \ 228 (((pg)->mdpage.pvh_attrs & PGA_MODIFIED) != 0) 229 230#define PMAP_STEAL_MEMORY /* enable pmap_steal_memory() */ 231#define PMAP_GROWKERNEL /* enable pmap_growkernel() */ 232 233/* 234 * Alternate mapping hooks for pool pages. Avoids thrashing the TLB. 235 */ 236#define PMAP_MAP_POOLPAGE(pa) ALPHA_PHYS_TO_K0SEG((pa)) 237#define PMAP_UNMAP_POOLPAGE(va) ALPHA_K0SEG_TO_PHYS((va)) 238 239/* 240 * Other hooks for the pool allocator. 241 */ 242#define POOL_VTOPHYS(va) ALPHA_K0SEG_TO_PHYS((vaddr_t) (va)) 243 244bool pmap_pageidlezero(paddr_t); 245#define PMAP_PAGEIDLEZERO(pa) pmap_pageidlezero((pa)) 246 247paddr_t vtophys(vaddr_t); 248 249/* Machine-specific functions. */ 250void pmap_bootstrap(paddr_t, u_int, u_long); 251int pmap_emulate_reference(struct lwp *, vaddr_t, int, int); 252#ifdef _PMAP_MAY_USE_PROM_CONSOLE 253int pmap_uses_prom_console(void); 254#endif 255 256#define pmap_pte_pa(pte) (PG_PFNUM(*(pte)) << PGSHIFT) 257#define pmap_pte_prot(pte) (*(pte) & PG_PROT) 258#define pmap_pte_w(pte) (*(pte) & PG_WIRED) 259#define pmap_pte_v(pte) (*(pte) & PG_V) 260#define pmap_pte_pv(pte) (*(pte) & PG_PVLIST) 261#define pmap_pte_asm(pte) (*(pte) & PG_ASM) 262#define pmap_pte_exec(pte) (*(pte) & PG_EXEC) 263 264#define pmap_pte_set_w(pte, v) \ 265do { \ 266 if (v) \ 267 *(pte) |= PG_WIRED; \ 268 else \ 269 *(pte) &= ~PG_WIRED; \ 270} while (0) 271 272#define pmap_pte_w_chg(pte, nw) ((nw) ^ pmap_pte_w(pte)) 273 274#define pmap_pte_set_prot(pte, np) \ 275do { \ 276 *(pte) &= ~PG_PROT; \ 277 *(pte) |= (np); \ 278} while (0) 279 280#define pmap_pte_prot_chg(pte, np) ((np) ^ pmap_pte_prot(pte)) 281 282static __inline pt_entry_t *pmap_l2pte(pmap_t, vaddr_t, pt_entry_t *); 283static __inline pt_entry_t *pmap_l3pte(pmap_t, vaddr_t, pt_entry_t *); 284 285#define pmap_l1pte(pmap, v) \ 286 (&(pmap)->pm_lev1map[l1pte_index((vaddr_t)(v))]) 287 288static __inline pt_entry_t * 289pmap_l2pte(pmap_t pmap, vaddr_t v, pt_entry_t *l1pte) 290{ 291 pt_entry_t *lev2map; 292 293 if (l1pte == NULL) { 294 l1pte = pmap_l1pte(pmap, v); 295 if (pmap_pte_v(l1pte) == 0) 296 return (NULL); 297 } 298 299 lev2map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l1pte)); 300 return (&lev2map[l2pte_index(v)]); 301} 302 303static __inline pt_entry_t * 304pmap_l3pte(pmap_t pmap, vaddr_t v, pt_entry_t *l2pte) 305{ 306 pt_entry_t *l1pte, *lev2map, *lev3map; 307 308 if (l2pte == NULL) { 309 l1pte = pmap_l1pte(pmap, v); 310 if (pmap_pte_v(l1pte) == 0) 311 return (NULL); 312 313 lev2map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l1pte)); 314 l2pte = &lev2map[l2pte_index(v)]; 315 if (pmap_pte_v(l2pte) == 0) 316 return (NULL); 317 } 318 319 lev3map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l2pte)); 320 return (&lev3map[l3pte_index(v)]); 321} 322 323/* 324 * Macros for locking pmap structures. 325 * 326 * Note that we if we access the kernel pmap in interrupt context, it 327 * is only to update statistics. Since stats are updated using atomic 328 * operations, locking the kernel pmap is not necessary. Therefore, 329 * it is not necessary to block interrupts when locking pmap strucutres. 330 */ 331#define PMAP_LOCK(pmap) mutex_enter(&(pmap)->pm_lock) 332#define PMAP_UNLOCK(pmap) mutex_exit(&(pmap)->pm_lock) 333 334/* 335 * Macro for processing deferred I-stream synchronization. 336 * 337 * The pmap module may defer syncing the user I-stream until the 338 * return to userspace, since the IMB PALcode op can be quite 339 * expensive. Since user instructions won't be executed until 340 * the return to userspace, this can be deferred until userret(). 341 */ 342#define PMAP_USERRET(pmap) \ 343do { \ 344 u_long cpu_mask = (1UL << cpu_number()); \ 345 \ 346 if ((pmap)->pm_needisync & cpu_mask) { \ 347 atomic_and_ulong(&(pmap)->pm_needisync, ~cpu_mask); \ 348 alpha_pal_imb(); \ 349 } \ 350} while (0) 351 352/* 353 * pmap-specific data store in the vm_page structure. 354 */ 355#define __HAVE_VM_PAGE_MD 356struct vm_page_md { 357 struct pv_entry *pvh_list; /* pv_entry list */ 358 int pvh_attrs; /* page attributes */ 359 unsigned pvh_refcnt; 360}; 361 362#define VM_MDPAGE_INIT(pg) \ 363do { \ 364 (pg)->mdpage.pvh_list = NULL; \ 365 (pg)->mdpage.pvh_refcnt = 0; \ 366} while (/*CONSTCOND*/0) 367 368#endif /* _KERNEL */ 369 370#endif /* _PMAP_MACHINE_ */ 371