pmap.h revision 1.91
1/* $NetBSD: pmap.h,v 1.91 2021/05/30 04:04:26 thorpej 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'). This is all padded to COHERENCY_UNIT 127 * to avoid false sharing. 128 * 129 * The kernel pmap is a special case; since the kernel uses only ASM 130 * mappings and uses a reserved ASN to keep the TLB clean, we don't 131 * allocate any ASN info for the kernel pmap at all. 132 * arrays which hold enough for ALPHA_MAXPROCS. 133 */ 134 135LIST_HEAD(pmap_pagelist, vm_page); 136 137struct pmap_percpu { 138 unsigned int pmc_asn; /* address space number */ 139 unsigned int pmc_pad0; 140 unsigned long pmc_asngen; /* ASN generation number */ 141 unsigned int pmc_needisync; /* CPU needes isync */ 142 unsigned int pmc_pad1; 143 pt_entry_t *pmc_lev1map; /* level 1 map */ 144 unsigned long pmc_padN[(COHERENCY_UNIT / 8) - 4]; 145}; 146 147struct pmap { /* pmaps are aligned to COHERENCY_UNIT boundaries */ 148 /* pmaps are locked by hashed mutexes */ 149 unsigned long pm_cpus; /* [ 0] CPUs using pmap */ 150 struct pmap_statistics pm_stats; /* [ 8] statistics */ 151 unsigned int pm_count; /* [24] reference count */ 152 unsigned int __pm_spare0; /* [28] spare field */ 153 struct pmap_pagelist pm_ptpages; /* [32] list of PT pages */ 154 unsigned long __pm_spare1; /* [40] spare field */ 155 TAILQ_ENTRY(pmap) pm_list; /* [48] list of all pmaps */ 156 /* -- COHERENCY_UNIT boundary -- */ 157 struct pmap_percpu pm_percpu[]; /* [64] per-CPU data */ 158 /* variable length */ 159}; 160 161#define PMAP_SIZEOF(x) \ 162 (ALIGN(offsetof(struct pmap, pm_percpu[(x)]))) 163 164#define PMAP_ASN_KERNEL 0 /* kernel-reserved ASN */ 165#define PMAP_ASN_FIRST_USER 1 /* first user ASN */ 166#define PMAP_ASNGEN_INVALID 0 /* reserved (invalid) ASN generation */ 167#define PMAP_ASNGEN_INITIAL 1 /* first valid generatation */ 168 169/* 170 * For each struct vm_page, there is a list of all currently valid virtual 171 * mappings of that page. An entry is a pv_entry_t, the list is pv_table. 172 */ 173typedef struct pv_entry { 174 struct pv_entry *pv_next; /* next pv_entry on list */ 175 struct pmap *pv_pmap; /* pmap where mapping lies */ 176 vaddr_t pv_va; /* virtual address for mapping */ 177 pt_entry_t *pv_pte; /* PTE that maps the VA */ 178} *pv_entry_t; 179 180/* pvh_attrs */ 181#define PGA_MODIFIED 0x01 /* modified */ 182#define PGA_REFERENCED 0x02 /* referenced */ 183 184/* pvh_usage */ 185#define PGU_NORMAL 0 /* free or normal use */ 186#define PGU_PVENT 1 /* PV entries */ 187#define PGU_L1PT 2 /* level 1 page table */ 188#define PGU_L2PT 3 /* level 2 page table */ 189#define PGU_L3PT 4 /* level 3 page table */ 190 191#ifdef _KERNEL 192 193#include <sys/atomic.h> 194 195struct cpu_info; 196struct trapframe; 197 198void pmap_init_cpu(struct cpu_info *); 199#if defined(MULTIPROCESSOR) 200void pmap_tlb_shootdown_ipi(struct cpu_info *, struct trapframe *); 201#endif /* MULTIPROCESSOR */ 202 203#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count) 204#define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count) 205 206#define pmap_copy(dp, sp, da, l, sa) /* nothing */ 207#define pmap_update(pmap) /* nothing (yet) */ 208 209static __inline bool 210pmap_remove_all(struct pmap *pmap) 211{ 212 /* Nothing. */ 213 return false; 214} 215 216#define pmap_is_referenced(pg) \ 217 (((pg)->mdpage.pvh_attrs & PGA_REFERENCED) != 0) 218#define pmap_is_modified(pg) \ 219 (((pg)->mdpage.pvh_attrs & PGA_MODIFIED) != 0) 220 221#define PMAP_STEAL_MEMORY /* enable pmap_steal_memory() */ 222#define PMAP_GROWKERNEL /* enable pmap_growkernel() */ 223 224#define PMAP_DIRECT 225#define PMAP_DIRECT_MAP(pa) ALPHA_PHYS_TO_K0SEG((pa)) 226#define PMAP_DIRECT_UNMAP(va) ALPHA_K0SEG_TO_PHYS((va)) 227 228static __inline int 229pmap_direct_process(paddr_t pa, voff_t pgoff, size_t len, 230 int (*process)(void *, size_t, void *), void *arg) 231{ 232 vaddr_t va = PMAP_DIRECT_MAP(pa); 233 234 return process((void *)(va + pgoff), len, arg); 235} 236 237/* 238 * Alternate mapping hooks for pool pages. Avoids thrashing the TLB. 239 */ 240#define PMAP_MAP_POOLPAGE(pa) PMAP_DIRECT_MAP(pa) 241#define PMAP_UNMAP_POOLPAGE(va) PMAP_DIRECT_UNMAP(va) 242 243/* 244 * Other hooks for the pool allocator. 245 */ 246#define POOL_VTOPHYS(va) ALPHA_K0SEG_TO_PHYS((vaddr_t) (va)) 247 248bool pmap_pageidlezero(paddr_t); 249#define PMAP_PAGEIDLEZERO(pa) pmap_pageidlezero((pa)) 250 251paddr_t vtophys(vaddr_t); 252 253/* Machine-specific functions. */ 254void pmap_bootstrap(paddr_t, u_int, u_long); 255int pmap_emulate_reference(struct lwp *, vaddr_t, int, int); 256 257#define pmap_pte_pa(pte) (PG_PFNUM(*(pte)) << PGSHIFT) 258#define pmap_pte_prot(pte) (*(pte) & PG_PROT) 259#define pmap_pte_w(pte) (*(pte) & PG_WIRED) 260#define pmap_pte_v(pte) (*(pte) & PG_V) 261#define pmap_pte_pv(pte) (*(pte) & PG_PVLIST) 262#define pmap_pte_asm(pte) (*(pte) & PG_ASM) 263#define pmap_pte_exec(pte) (*(pte) & PG_EXEC) 264 265#define pmap_pte_set_w(pte, v) \ 266do { \ 267 if (v) \ 268 *(pte) |= PG_WIRED; \ 269 else \ 270 *(pte) &= ~PG_WIRED; \ 271} while (0) 272 273#define pmap_pte_w_chg(pte, nw) ((nw) ^ pmap_pte_w(pte)) 274 275#define pmap_pte_set_prot(pte, np) \ 276do { \ 277 *(pte) &= ~PG_PROT; \ 278 *(pte) |= (np); \ 279} while (0) 280 281#define pmap_pte_prot_chg(pte, np) ((np) ^ pmap_pte_prot(pte)) 282 283static __inline pt_entry_t * 284pmap_lev1map(pmap_t pmap) 285{ 286 if (__predict_false(pmap == pmap_kernel())) { 287 return kernel_lev1map; 288 } 289 /* 290 * We're just reading a per-CPU field that's the same on 291 * all CPUs, so don't bother disabling preemption around 292 * this. 293 */ 294 return pmap->pm_percpu[cpu_number()].pmc_lev1map; 295} 296 297static __inline pt_entry_t * 298pmap_l1pte(pt_entry_t *lev1map, vaddr_t v) 299{ 300 KASSERT(lev1map != NULL); 301 return &lev1map[l1pte_index(v)]; 302} 303 304static __inline pt_entry_t * 305pmap_l2pte(pt_entry_t *lev1map, vaddr_t v, pt_entry_t *l1pte) 306{ 307 pt_entry_t *lev2map; 308 309 if (l1pte == NULL) { 310 l1pte = pmap_l1pte(lev1map, v); 311 if (pmap_pte_v(l1pte) == 0) 312 return NULL; 313 } 314 315 lev2map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l1pte)); 316 return &lev2map[l2pte_index(v)]; 317} 318 319static __inline pt_entry_t * 320pmap_l3pte(pt_entry_t *lev1map, vaddr_t v, pt_entry_t *l2pte) 321{ 322 pt_entry_t *l1pte, *lev2map, *lev3map; 323 324 if (l2pte == NULL) { 325 l1pte = pmap_l1pte(lev1map, v); 326 if (pmap_pte_v(l1pte) == 0) 327 return NULL; 328 329 lev2map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l1pte)); 330 l2pte = &lev2map[l2pte_index(v)]; 331 if (pmap_pte_v(l2pte) == 0) 332 return NULL; 333 } 334 335 lev3map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l2pte)); 336 return &lev3map[l3pte_index(v)]; 337} 338 339/* 340 * Macro for processing deferred I-stream synchronization. 341 * 342 * The pmap module may defer syncing the user I-stream until the 343 * return to userspace, since the IMB PALcode op can be quite 344 * expensive. Since user instructions won't be executed until 345 * the return to userspace, this can be deferred until userret(). 346 */ 347#define PMAP_USERRET(pmap) \ 348do { \ 349 const unsigned long cpu_id = cpu_number(); \ 350 \ 351 if ((pmap)->pm_percpu[cpu_id].pmc_needisync) { \ 352 (pmap)->pm_percpu[cpu_id].pmc_needisync = 0; \ 353 alpha_pal_imb(); \ 354 } \ 355} while (0) 356 357/* 358 * pmap-specific data store in the vm_page structure. 359 */ 360#define __HAVE_VM_PAGE_MD 361struct vm_page_md { 362 struct pv_entry *pvh_list; /* pv_entry list */ 363 int pvh_attrs; /* page attributes */ 364}; 365 366#define VM_MDPAGE_INIT(pg) \ 367do { \ 368 (pg)->mdpage.pvh_list = NULL; \ 369 (pg)->mdpage.pvh_attrs = 0; \ 370} while (/*CONSTCOND*/0) 371 372#endif /* _KERNEL */ 373 374#endif /* _PMAP_MACHINE_ */ 375