| 1 | /* |
| 2 | * (MPSAFE) |
| 3 | * |
| 4 | * Copyright (c) 1991 Regents of the University of California. |
| 5 | * All rights reserved. |
| 6 | * Copyright (c) 1994 John S. Dyson |
| 7 | * All rights reserved. |
| 8 | * Copyright (c) 1994 David Greenman |
| 9 | * All rights reserved. |
| 10 | * |
| 11 | * This code is derived from software contributed to Berkeley by |
| 12 | * the Systems Programming Group of the University of Utah Computer |
| 13 | * Science Department and William Jolitz of UUNET Technologies Inc. |
| 14 | * |
| 15 | * Redistribution and use in source and binary forms, with or without |
| 16 | * modification, are permitted provided that the following conditions |
| 17 | * are met: |
| 18 | * 1. Redistributions of source code must retain the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer. |
| 20 | * 2. Redistributions in binary form must reproduce the above copyright |
| 21 | * notice, this list of conditions and the following disclaimer in the |
| 22 | * documentation and/or other materials provided with the distribution. |
| 23 | * 3. All advertising materials mentioning features or use of this software |
| 24 | * must display the following acknowledgement: |
| 25 | * This product includes software developed by the University of |
| 26 | * California, Berkeley and its contributors. |
| 27 | * 4. Neither the name of the University nor the names of its contributors |
| 28 | * may be used to endorse or promote products derived from this software |
| 29 | * without specific prior written permission. |
| 30 | * |
| 31 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 32 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 33 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 34 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 35 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 39 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 40 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 41 | * SUCH DAMAGE. |
| 42 | * |
| 43 | * from: @(#)pmap.c 7.7 (Berkeley) 5/12/91 |
| 44 | * $FreeBSD: src/sys/i386/i386/pmap.c,v 1.250.2.18 2002/03/06 22:48:53 silby Exp $ |
| 45 | */ |
| 46 | |
| 47 | /* |
| 48 | * Manages physical address maps. |
| 49 | * |
| 50 | * In most cases we hold page table pages busy in order to manipulate them. |
| 51 | */ |
| 52 | /* |
| 53 | * PMAP_DEBUG - see platform/pc32/include/pmap.h |
| 54 | */ |
| 55 | |
| 56 | #include "opt_disable_pse.h" |
| 57 | #include "opt_pmap.h" |
| 58 | #include "opt_msgbuf.h" |
| 59 | |
| 60 | #include <sys/param.h> |
| 61 | #include <sys/systm.h> |
| 62 | #include <sys/kernel.h> |
| 63 | #include <sys/proc.h> |
| 64 | #include <sys/msgbuf.h> |
| 65 | #include <sys/vmmeter.h> |
| 66 | #include <sys/mman.h> |
| 67 | #include <sys/thread.h> |
| 68 | |
| 69 | #include <vm/vm.h> |
| 70 | #include <vm/vm_param.h> |
| 71 | #include <sys/sysctl.h> |
| 72 | #include <sys/lock.h> |
| 73 | #include <vm/vm_kern.h> |
| 74 | #include <vm/vm_page.h> |
| 75 | #include <vm/vm_map.h> |
| 76 | #include <vm/vm_object.h> |
| 77 | #include <vm/vm_extern.h> |
| 78 | #include <vm/vm_pageout.h> |
| 79 | #include <vm/vm_pager.h> |
| 80 | #include <vm/vm_zone.h> |
| 81 | |
| 82 | #include <sys/user.h> |
| 83 | #include <sys/thread2.h> |
| 84 | #include <sys/sysref2.h> |
| 85 | #include <sys/spinlock2.h> |
| 86 | #include <vm/vm_page2.h> |
| 87 | |
| 88 | #include <machine/cputypes.h> |
| 89 | #include <machine/md_var.h> |
| 90 | #include <machine/specialreg.h> |
| 91 | #include <machine/smp.h> |
| 92 | #include <machine_base/apic/apicreg.h> |
| 93 | #include <machine/globaldata.h> |
| 94 | #include <machine/pmap.h> |
| 95 | #include <machine/pmap_inval.h> |
| 96 | |
| 97 | #define PMAP_KEEP_PDIRS |
| 98 | #ifndef PMAP_SHPGPERPROC |
| 99 | #define PMAP_SHPGPERPROC 200 |
| 100 | #define PMAP_PVLIMIT 1400000 /* i386 kvm problems */ |
| 101 | #endif |
| 102 | |
| 103 | #if defined(DIAGNOSTIC) |
| 104 | #define PMAP_DIAGNOSTIC |
| 105 | #endif |
| 106 | |
| 107 | #define MINPV 2048 |
| 108 | |
| 109 | #if !defined(PMAP_DIAGNOSTIC) |
| 110 | #define PMAP_INLINE __inline |
| 111 | #else |
| 112 | #define PMAP_INLINE |
| 113 | #endif |
| 114 | |
| 115 | /* |
| 116 | * Get PDEs and PTEs for user/kernel address space |
| 117 | */ |
| 118 | #define pmap_pde(m, v) (&((m)->pm_pdir[(vm_offset_t)(v) >> PDRSHIFT])) |
| 119 | #define pdir_pde(m, v) (m[(vm_offset_t)(v) >> PDRSHIFT]) |
| 120 | |
| 121 | #define pmap_pde_v(pte) ((*(int *)pte & PG_V) != 0) |
| 122 | #define pmap_pte_w(pte) ((*(int *)pte & PG_W) != 0) |
| 123 | #define pmap_pte_m(pte) ((*(int *)pte & PG_M) != 0) |
| 124 | #define pmap_pte_u(pte) ((*(int *)pte & PG_A) != 0) |
| 125 | #define pmap_pte_v(pte) ((*(int *)pte & PG_V) != 0) |
| 126 | |
| 127 | /* |
| 128 | * Given a map and a machine independent protection code, |
| 129 | * convert to a vax protection code. |
| 130 | */ |
| 131 | #define pte_prot(m, p) \ |
| 132 | (protection_codes[p & (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)]) |
| 133 | static int protection_codes[8]; |
| 134 | |
| 135 | struct pmap kernel_pmap; |
| 136 | static TAILQ_HEAD(,pmap) pmap_list = TAILQ_HEAD_INITIALIZER(pmap_list); |
| 137 | |
| 138 | vm_paddr_t avail_start; /* PA of first available physical page */ |
| 139 | vm_paddr_t avail_end; /* PA of last available physical page */ |
| 140 | vm_offset_t virtual_start; /* VA of first avail page (after kernel bss) */ |
| 141 | vm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */ |
| 142 | vm_offset_t virtual2_start; |
| 143 | vm_offset_t virtual2_end; |
| 144 | vm_offset_t KvaStart; /* VA start of KVA space */ |
| 145 | vm_offset_t KvaEnd; /* VA end of KVA space (non-inclusive) */ |
| 146 | vm_offset_t KvaSize; /* max size of kernel virtual address space */ |
| 147 | static boolean_t pmap_initialized = FALSE; /* Has pmap_init completed? */ |
| 148 | static int pgeflag; /* PG_G or-in */ |
| 149 | static int pseflag; /* PG_PS or-in */ |
| 150 | |
| 151 | static vm_object_t kptobj; |
| 152 | |
| 153 | static int nkpt; |
| 154 | vm_offset_t kernel_vm_end; |
| 155 | |
| 156 | /* |
| 157 | * Data for the pv entry allocation mechanism |
| 158 | */ |
| 159 | static vm_zone_t pvzone; |
| 160 | static struct vm_zone pvzone_store; |
| 161 | static struct vm_object pvzone_obj; |
| 162 | static int pv_entry_count=0, pv_entry_max=0, pv_entry_high_water=0; |
| 163 | static int pmap_pagedaemon_waken = 0; |
| 164 | static struct pv_entry *pvinit; |
| 165 | |
| 166 | /* |
| 167 | * Considering all the issues I'm having with pmap caching, if breakage |
| 168 | * continues to occur, and for debugging, I've added a sysctl that will |
| 169 | * just do an unconditional invltlb. |
| 170 | */ |
| 171 | static int dreadful_invltlb; |
| 172 | |
| 173 | SYSCTL_INT(_vm, OID_AUTO, dreadful_invltlb, |
| 174 | CTLFLAG_RW, &dreadful_invltlb, 0, "Debugging sysctl to force invltlb on pmap operations"); |
| 175 | |
| 176 | /* |
| 177 | * All those kernel PT submaps that BSD is so fond of |
| 178 | */ |
| 179 | pt_entry_t *CMAP1 = NULL, *ptmmap; |
| 180 | caddr_t CADDR1 = 0, ptvmmap = 0; |
| 181 | static pt_entry_t *msgbufmap; |
| 182 | struct msgbuf *msgbufp=NULL; |
| 183 | |
| 184 | /* |
| 185 | * Crashdump maps. |
| 186 | */ |
| 187 | static pt_entry_t *pt_crashdumpmap; |
| 188 | static caddr_t crashdumpmap; |
| 189 | |
| 190 | extern pt_entry_t *SMPpt; |
| 191 | |
| 192 | static PMAP_INLINE void free_pv_entry (pv_entry_t pv); |
| 193 | static unsigned * get_ptbase (pmap_t pmap); |
| 194 | static pv_entry_t get_pv_entry (void); |
| 195 | static void i386_protection_init (void); |
| 196 | static __inline void pmap_clearbit (vm_page_t m, int bit); |
| 197 | |
| 198 | static void pmap_remove_all (vm_page_t m); |
| 199 | static int pmap_remove_pte (struct pmap *pmap, unsigned *ptq, |
| 200 | vm_offset_t sva, pmap_inval_info_t info); |
| 201 | static void pmap_remove_page (struct pmap *pmap, |
| 202 | vm_offset_t va, pmap_inval_info_t info); |
| 203 | static int pmap_remove_entry (struct pmap *pmap, vm_page_t m, |
| 204 | vm_offset_t va, pmap_inval_info_t info); |
| 205 | static boolean_t pmap_testbit (vm_page_t m, int bit); |
| 206 | static void pmap_insert_entry (pmap_t pmap, pv_entry_t pv, |
| 207 | vm_offset_t va, vm_page_t mpte, vm_page_t m); |
| 208 | |
| 209 | static vm_page_t pmap_allocpte (pmap_t pmap, vm_offset_t va); |
| 210 | |
| 211 | static int pmap_release_free_page (pmap_t pmap, vm_page_t p); |
| 212 | static vm_page_t _pmap_allocpte (pmap_t pmap, unsigned ptepindex); |
| 213 | static unsigned * pmap_pte_quick (pmap_t pmap, vm_offset_t va); |
| 214 | static vm_page_t pmap_page_lookup (vm_object_t object, vm_pindex_t pindex); |
| 215 | static int pmap_unuse_pt (pmap_t, vm_offset_t, vm_page_t, pmap_inval_info_t); |
| 216 | static vm_offset_t pmap_kmem_choose(vm_offset_t addr); |
| 217 | |
| 218 | static unsigned pdir4mb; |
| 219 | |
| 220 | /* |
| 221 | * Move the kernel virtual free pointer to the next |
| 222 | * 4MB. This is used to help improve performance |
| 223 | * by using a large (4MB) page for much of the kernel |
| 224 | * (.text, .data, .bss) |
| 225 | */ |
| 226 | static |
| 227 | vm_offset_t |
| 228 | pmap_kmem_choose(vm_offset_t addr) |
| 229 | { |
| 230 | vm_offset_t newaddr = addr; |
| 231 | #ifndef DISABLE_PSE |
| 232 | if (cpu_feature & CPUID_PSE) { |
| 233 | newaddr = (addr + (NBPDR - 1)) & ~(NBPDR - 1); |
| 234 | } |
| 235 | #endif |
| 236 | return newaddr; |
| 237 | } |
| 238 | |
| 239 | /* |
| 240 | * This function returns a pointer to the pte entry in the pmap and has |
| 241 | * the side effect of potentially retaining a cached mapping of the pmap. |
| 242 | * |
| 243 | * The caller must hold vm_token and the returned value is only valid |
| 244 | * until the caller blocks or releases the token. |
| 245 | */ |
| 246 | static |
| 247 | unsigned * |
| 248 | pmap_pte(pmap_t pmap, vm_offset_t va) |
| 249 | { |
| 250 | unsigned *pdeaddr; |
| 251 | |
| 252 | ASSERT_LWKT_TOKEN_HELD(&vm_token); |
| 253 | if (pmap) { |
| 254 | pdeaddr = (unsigned *) pmap_pde(pmap, va); |
| 255 | if (*pdeaddr & PG_PS) |
| 256 | return pdeaddr; |
| 257 | if (*pdeaddr) |
| 258 | return get_ptbase(pmap) + i386_btop(va); |
| 259 | } |
| 260 | return (0); |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * pmap_pte using the kernel_pmap |
| 265 | * |
| 266 | * Used for debugging, no requirements. |
| 267 | */ |
| 268 | unsigned * |
| 269 | pmap_kernel_pte(vm_offset_t va) |
| 270 | { |
| 271 | unsigned *pdeaddr; |
| 272 | |
| 273 | pdeaddr = (unsigned *) pmap_pde(&kernel_pmap, va); |
| 274 | if (*pdeaddr & PG_PS) |
| 275 | return pdeaddr; |
| 276 | if (*pdeaddr) |
| 277 | return (unsigned *)vtopte(va); |
| 278 | return(0); |
| 279 | } |
| 280 | |
| 281 | /* |
| 282 | * pmap_pte_quick: |
| 283 | * |
| 284 | * Super fast pmap_pte routine best used when scanning the pv lists. |
| 285 | * This eliminates many course-grained invltlb calls. Note that many of |
| 286 | * the pv list scans are across different pmaps and it is very wasteful |
| 287 | * to do an entire invltlb when checking a single mapping. |
| 288 | * |
| 289 | * Should only be called while in a critical section. |
| 290 | * |
| 291 | * The caller must hold vm_token and the returned value is only valid |
| 292 | * until the caller blocks or releases the token. |
| 293 | */ |
| 294 | static |
| 295 | unsigned * |
| 296 | pmap_pte_quick(pmap_t pmap, vm_offset_t va) |
| 297 | { |
| 298 | struct mdglobaldata *gd = mdcpu; |
| 299 | unsigned pde, newpf; |
| 300 | |
| 301 | ASSERT_LWKT_TOKEN_HELD(&vm_token); |
| 302 | if ((pde = (unsigned) pmap->pm_pdir[va >> PDRSHIFT]) != 0) { |
| 303 | unsigned frame = (unsigned) pmap->pm_pdir[PTDPTDI] & PG_FRAME; |
| 304 | unsigned index = i386_btop(va); |
| 305 | /* are we current address space or kernel? */ |
| 306 | if ((pmap == &kernel_pmap) || |
| 307 | (frame == (((unsigned) PTDpde) & PG_FRAME))) { |
| 308 | return (unsigned *) PTmap + index; |
| 309 | } |
| 310 | newpf = pde & PG_FRAME; |
| 311 | if (((*(unsigned *)gd->gd_PMAP1) & PG_FRAME) != newpf) { |
| 312 | *(unsigned *)gd->gd_PMAP1 = newpf | PG_RW | PG_V; |
| 313 | cpu_invlpg(gd->gd_PADDR1); |
| 314 | } |
| 315 | return gd->gd_PADDR1 + (index & (NPTEPG - 1)); |
| 316 | } |
| 317 | return (0); |
| 318 | } |
| 319 | |
| 320 | |
| 321 | /* |
| 322 | * Bootstrap the system enough to run with virtual memory. |
| 323 | * |
| 324 | * On the i386 this is called after mapping has already been enabled |
| 325 | * and just syncs the pmap module with what has already been done. |
| 326 | * [We can't call it easily with mapping off since the kernel is not |
| 327 | * mapped with PA == VA, hence we would have to relocate every address |
| 328 | * from the linked base (virtual) address "KERNBASE" to the actual |
| 329 | * (physical) address starting relative to 0] |
| 330 | */ |
| 331 | void |
| 332 | pmap_bootstrap(vm_paddr_t firstaddr, vm_paddr_t loadaddr) |
| 333 | { |
| 334 | vm_offset_t va; |
| 335 | pt_entry_t *pte; |
| 336 | struct mdglobaldata *gd; |
| 337 | int i; |
| 338 | int pg; |
| 339 | |
| 340 | KvaStart = (vm_offset_t)VADDR(PTDPTDI, 0); |
| 341 | KvaSize = (vm_offset_t)VADDR(APTDPTDI, 0) - KvaStart; |
| 342 | KvaEnd = KvaStart + KvaSize; |
| 343 | |
| 344 | avail_start = firstaddr; |
| 345 | |
| 346 | /* |
| 347 | * XXX The calculation of virtual_start is wrong. It's NKPT*PAGE_SIZE |
| 348 | * too large. It should instead be correctly calculated in locore.s and |
| 349 | * not based on 'first' (which is a physical address, not a virtual |
| 350 | * address, for the start of unused physical memory). The kernel |
| 351 | * page tables are NOT double mapped and thus should not be included |
| 352 | * in this calculation. |
| 353 | */ |
| 354 | virtual_start = (vm_offset_t) KERNBASE + firstaddr; |
| 355 | virtual_start = pmap_kmem_choose(virtual_start); |
| 356 | virtual_end = VADDR(KPTDI+NKPDE-1, NPTEPG-1); |
| 357 | |
| 358 | /* |
| 359 | * Initialize protection array. |
| 360 | */ |
| 361 | i386_protection_init(); |
| 362 | |
| 363 | /* |
| 364 | * The kernel's pmap is statically allocated so we don't have to use |
| 365 | * pmap_create, which is unlikely to work correctly at this part of |
| 366 | * the boot sequence (XXX and which no longer exists). |
| 367 | * |
| 368 | * The kernel_pmap's pm_pteobj is used only for locking and not |
| 369 | * for mmu pages. |
| 370 | */ |
| 371 | kernel_pmap.pm_pdir = (pd_entry_t *)(KERNBASE + (u_int)IdlePTD); |
| 372 | kernel_pmap.pm_count = 1; |
| 373 | kernel_pmap.pm_active = (cpumask_t)-1 & ~CPUMASK_LOCK; |
| 374 | kernel_pmap.pm_pteobj = &kernel_object; |
| 375 | TAILQ_INIT(&kernel_pmap.pm_pvlist); |
| 376 | TAILQ_INIT(&kernel_pmap.pm_pvlist_free); |
| 377 | spin_init(&kernel_pmap.pm_spin); |
| 378 | lwkt_token_init(&kernel_pmap.pm_token, "kpmap_tok"); |
| 379 | nkpt = NKPT; |
| 380 | |
| 381 | /* |
| 382 | * Reserve some special page table entries/VA space for temporary |
| 383 | * mapping of pages. |
| 384 | */ |
| 385 | #define SYSMAP(c, p, v, n) \ |
| 386 | v = (c)va; va += ((n)*PAGE_SIZE); p = pte; pte += (n); |
| 387 | |
| 388 | va = virtual_start; |
| 389 | pte = (pt_entry_t *) pmap_kernel_pte(va); |
| 390 | |
| 391 | /* |
| 392 | * CMAP1/CMAP2 are used for zeroing and copying pages. |
| 393 | */ |
| 394 | SYSMAP(caddr_t, CMAP1, CADDR1, 1) |
| 395 | |
| 396 | /* |
| 397 | * Crashdump maps. |
| 398 | */ |
| 399 | SYSMAP(caddr_t, pt_crashdumpmap, crashdumpmap, MAXDUMPPGS); |
| 400 | |
| 401 | /* |
| 402 | * ptvmmap is used for reading arbitrary physical pages via |
| 403 | * /dev/mem. |
| 404 | */ |
| 405 | SYSMAP(caddr_t, ptmmap, ptvmmap, 1) |
| 406 | |
| 407 | /* |
| 408 | * msgbufp is used to map the system message buffer. |
| 409 | * XXX msgbufmap is not used. |
| 410 | */ |
| 411 | SYSMAP(struct msgbuf *, msgbufmap, msgbufp, |
| 412 | atop(round_page(MSGBUF_SIZE))) |
| 413 | |
| 414 | virtual_start = va; |
| 415 | |
| 416 | *(int *) CMAP1 = 0; |
| 417 | for (i = 0; i < NKPT; i++) |
| 418 | PTD[i] = 0; |
| 419 | |
| 420 | /* |
| 421 | * PG_G is terribly broken on SMP because we IPI invltlb's in some |
| 422 | * cases rather then invl1pg. Actually, I don't even know why it |
| 423 | * works under UP because self-referential page table mappings |
| 424 | */ |
| 425 | #ifdef SMP |
| 426 | pgeflag = 0; |
| 427 | #else |
| 428 | if (cpu_feature & CPUID_PGE) |
| 429 | pgeflag = PG_G; |
| 430 | #endif |
| 431 | |
| 432 | /* |
| 433 | * Initialize the 4MB page size flag |
| 434 | */ |
| 435 | pseflag = 0; |
| 436 | /* |
| 437 | * The 4MB page version of the initial |
| 438 | * kernel page mapping. |
| 439 | */ |
| 440 | pdir4mb = 0; |
| 441 | |
| 442 | #if !defined(DISABLE_PSE) |
| 443 | if (cpu_feature & CPUID_PSE) { |
| 444 | unsigned ptditmp; |
| 445 | /* |
| 446 | * Note that we have enabled PSE mode |
| 447 | */ |
| 448 | pseflag = PG_PS; |
| 449 | ptditmp = *((unsigned *)PTmap + i386_btop(KERNBASE)); |
| 450 | ptditmp &= ~(NBPDR - 1); |
| 451 | ptditmp |= PG_V | PG_RW | PG_PS | PG_U | pgeflag; |
| 452 | pdir4mb = ptditmp; |
| 453 | |
| 454 | #ifndef SMP |
| 455 | /* |
| 456 | * Enable the PSE mode. If we are SMP we can't do this |
| 457 | * now because the APs will not be able to use it when |
| 458 | * they boot up. |
| 459 | */ |
| 460 | load_cr4(rcr4() | CR4_PSE); |
| 461 | |
| 462 | /* |
| 463 | * We can do the mapping here for the single processor |
| 464 | * case. We simply ignore the old page table page from |
| 465 | * now on. |
| 466 | */ |
| 467 | /* |
| 468 | * For SMP, we still need 4K pages to bootstrap APs, |
| 469 | * PSE will be enabled as soon as all APs are up. |
| 470 | */ |
| 471 | PTD[KPTDI] = (pd_entry_t)ptditmp; |
| 472 | kernel_pmap.pm_pdir[KPTDI] = (pd_entry_t)ptditmp; |
| 473 | cpu_invltlb(); |
| 474 | #endif |
| 475 | } |
| 476 | #endif |
| 477 | |
| 478 | /* |
| 479 | * We need to finish setting up the globaldata page for the BSP. |
| 480 | * locore has already populated the page table for the mdglobaldata |
| 481 | * portion. |
| 482 | */ |
| 483 | pg = MDGLOBALDATA_BASEALLOC_PAGES; |
| 484 | gd = &CPU_prvspace[0].mdglobaldata; |
| 485 | gd->gd_CMAP1 = &SMPpt[pg + 0]; |
| 486 | gd->gd_CMAP2 = &SMPpt[pg + 1]; |
| 487 | gd->gd_CMAP3 = &SMPpt[pg + 2]; |
| 488 | gd->gd_PMAP1 = &SMPpt[pg + 3]; |
| 489 | gd->gd_GDMAP1 = &PTD[APTDPTDI]; |
| 490 | gd->gd_CADDR1 = CPU_prvspace[0].CPAGE1; |
| 491 | gd->gd_CADDR2 = CPU_prvspace[0].CPAGE2; |
| 492 | gd->gd_CADDR3 = CPU_prvspace[0].CPAGE3; |
| 493 | gd->gd_PADDR1 = (unsigned *)CPU_prvspace[0].PPAGE1; |
| 494 | gd->gd_GDADDR1= (unsigned *)VADDR(APTDPTDI, 0); |
| 495 | |
| 496 | cpu_invltlb(); |
| 497 | } |
| 498 | |
| 499 | #ifdef SMP |
| 500 | /* |
| 501 | * Set 4mb pdir for mp startup |
| 502 | */ |
| 503 | void |
| 504 | pmap_set_opt(void) |
| 505 | { |
| 506 | if (pseflag && (cpu_feature & CPUID_PSE)) { |
| 507 | load_cr4(rcr4() | CR4_PSE); |
| 508 | if (pdir4mb && mycpu->gd_cpuid == 0) { /* only on BSP */ |
| 509 | kernel_pmap.pm_pdir[KPTDI] = |
| 510 | PTD[KPTDI] = (pd_entry_t)pdir4mb; |
| 511 | cpu_invltlb(); |
| 512 | } |
| 513 | } |
| 514 | } |
| 515 | #endif |
| 516 | |
| 517 | /* |
| 518 | * Initialize the pmap module, called by vm_init() |
| 519 | * |
| 520 | * Called from the low level boot code only. |
| 521 | */ |
| 522 | void |
| 523 | pmap_init(void) |
| 524 | { |
| 525 | int i; |
| 526 | int initial_pvs; |
| 527 | |
| 528 | /* |
| 529 | * object for kernel page table pages |
| 530 | */ |
| 531 | kptobj = vm_object_allocate(OBJT_DEFAULT, NKPDE); |
| 532 | |
| 533 | /* |
| 534 | * Allocate memory for random pmap data structures. Includes the |
| 535 | * pv_head_table. |
| 536 | */ |
| 537 | |
| 538 | for(i = 0; i < vm_page_array_size; i++) { |
| 539 | vm_page_t m; |
| 540 | |
| 541 | m = &vm_page_array[i]; |
| 542 | TAILQ_INIT(&m->md.pv_list); |
| 543 | m->md.pv_list_count = 0; |
| 544 | } |
| 545 | |
| 546 | /* |
| 547 | * init the pv free list |
| 548 | */ |
| 549 | initial_pvs = vm_page_array_size; |
| 550 | if (initial_pvs < MINPV) |
| 551 | initial_pvs = MINPV; |
| 552 | pvzone = &pvzone_store; |
| 553 | pvinit = (void *)kmem_alloc(&kernel_map, |
| 554 | initial_pvs * sizeof (struct pv_entry)); |
| 555 | zbootinit(pvzone, "PV ENTRY", sizeof (struct pv_entry), |
| 556 | pvinit, initial_pvs); |
| 557 | |
| 558 | /* |
| 559 | * Now it is safe to enable pv_table recording. |
| 560 | */ |
| 561 | pmap_initialized = TRUE; |
| 562 | } |
| 563 | |
| 564 | /* |
| 565 | * Initialize the address space (zone) for the pv_entries. Set a |
| 566 | * high water mark so that the system can recover from excessive |
| 567 | * numbers of pv entries. |
| 568 | * |
| 569 | * Called from the low level boot code only. |
| 570 | */ |
| 571 | void |
| 572 | pmap_init2(void) |
| 573 | { |
| 574 | int shpgperproc = PMAP_SHPGPERPROC; |
| 575 | int entry_max; |
| 576 | |
| 577 | TUNABLE_INT_FETCH("vm.pmap.shpgperproc", &shpgperproc); |
| 578 | pv_entry_max = shpgperproc * maxproc + vm_page_array_size; |
| 579 | |
| 580 | #ifdef PMAP_PVLIMIT |
| 581 | /* |
| 582 | * Horrible hack for systems with a lot of memory running i386. |
| 583 | * the calculated pv_entry_max can wind up eating a ton of KVM |
| 584 | * so put a cap on the number of entries if the user did not |
| 585 | * change any of the values. This saves about 44MB of KVM on |
| 586 | * boxes with 3+GB of ram. |
| 587 | * |
| 588 | * On the flip side, this makes it more likely that some setups |
| 589 | * will run out of pv entries. Those sysads will have to bump |
| 590 | * the limit up with vm.pamp.pv_entries or vm.pmap.shpgperproc. |
| 591 | */ |
| 592 | if (shpgperproc == PMAP_SHPGPERPROC) { |
| 593 | if (pv_entry_max > PMAP_PVLIMIT) |
| 594 | pv_entry_max = PMAP_PVLIMIT; |
| 595 | } |
| 596 | #endif |
| 597 | TUNABLE_INT_FETCH("vm.pmap.pv_entries", &pv_entry_max); |
| 598 | pv_entry_high_water = 9 * (pv_entry_max / 10); |
| 599 | |
| 600 | /* |
| 601 | * Subtract out pages already installed in the zone (hack) |
| 602 | */ |
| 603 | entry_max = pv_entry_max - vm_page_array_size; |
| 604 | if (entry_max <= 0) |
| 605 | entry_max = 1; |
| 606 | |
| 607 | zinitna(pvzone, &pvzone_obj, NULL, 0, entry_max, ZONE_INTERRUPT, 1); |
| 608 | } |
| 609 | |
| 610 | |
| 611 | /*************************************************** |
| 612 | * Low level helper routines..... |
| 613 | ***************************************************/ |
| 614 | |
| 615 | #ifdef PMAP_DEBUG |
| 616 | |
| 617 | static void |
| 618 | test_m_maps_pv(vm_page_t m, pv_entry_t pv) |
| 619 | { |
| 620 | pv_entry_t spv; |
| 621 | |
| 622 | crit_enter(); |
| 623 | #ifdef PMAP_DEBUG |
| 624 | KKASSERT(pv->pv_m == m); |
| 625 | #endif |
| 626 | TAILQ_FOREACH(spv, &m->md.pv_list, pv_list) { |
| 627 | if (pv == spv) { |
| 628 | crit_exit(); |
| 629 | return; |
| 630 | } |
| 631 | } |
| 632 | crit_exit(); |
| 633 | panic("test_m_maps_pv: failed m %p pv %p", m, pv); |
| 634 | } |
| 635 | |
| 636 | static void |
| 637 | ptbase_assert(struct pmap *pmap) |
| 638 | { |
| 639 | unsigned frame = (unsigned) pmap->pm_pdir[PTDPTDI] & PG_FRAME; |
| 640 | |
| 641 | /* are we current address space or kernel? */ |
| 642 | if (pmap == &kernel_pmap || frame == (((unsigned)PTDpde) & PG_FRAME)) |
| 643 | return; |
| 644 | KKASSERT(frame == (*mdcpu->gd_GDMAP1 & PG_FRAME)); |
| 645 | } |
| 646 | |
| 647 | #else |
| 648 | |
| 649 | #define test_m_maps_pv(m, pv) |
| 650 | #define ptbase_assert(pmap) |
| 651 | |
| 652 | #endif |
| 653 | |
| 654 | #if defined(PMAP_DIAGNOSTIC) |
| 655 | |
| 656 | /* |
| 657 | * This code checks for non-writeable/modified pages. |
| 658 | * This should be an invalid condition. |
| 659 | */ |
| 660 | static int |
| 661 | pmap_nw_modified(pt_entry_t ptea) |
| 662 | { |
| 663 | int pte; |
| 664 | |
| 665 | pte = (int) ptea; |
| 666 | |
| 667 | if ((pte & (PG_M|PG_RW)) == PG_M) |
| 668 | return 1; |
| 669 | else |
| 670 | return 0; |
| 671 | } |
| 672 | #endif |
| 673 | |
| 674 | |
| 675 | /* |
| 676 | * This routine defines the region(s) of memory that should not be tested |
| 677 | * for the modified bit. |
| 678 | * |
| 679 | * No requirements. |
| 680 | */ |
| 681 | static PMAP_INLINE int |
| 682 | pmap_track_modified(vm_offset_t va) |
| 683 | { |
| 684 | if ((va < clean_sva) || (va >= clean_eva)) |
| 685 | return 1; |
| 686 | else |
| 687 | return 0; |
| 688 | } |
| 689 | |
| 690 | /* |
| 691 | * Retrieve the mapped page table base for a particular pmap. Use our self |
| 692 | * mapping for the kernel_pmap or our current pmap. |
| 693 | * |
| 694 | * For foreign pmaps we use the per-cpu page table map. Since this involves |
| 695 | * installing a ptd it's actually (per-process x per-cpu). However, we |
| 696 | * still cannot depend on our mapping to survive thread switches because |
| 697 | * the process might be threaded and switching to another thread for the |
| 698 | * same process on the same cpu will allow that other thread to make its |
| 699 | * own mapping. |
| 700 | * |
| 701 | * This could be a bit confusing but the jist is for something like the |
| 702 | * vkernel which uses foreign pmaps all the time this represents a pretty |
| 703 | * good cache that avoids unnecessary invltlb()s. |
| 704 | * |
| 705 | * The caller must hold vm_token and the returned value is only valid |
| 706 | * until the caller blocks or releases the token. |
| 707 | */ |
| 708 | static unsigned * |
| 709 | get_ptbase(pmap_t pmap) |
| 710 | { |
| 711 | unsigned frame = (unsigned) pmap->pm_pdir[PTDPTDI] & PG_FRAME; |
| 712 | struct mdglobaldata *gd = mdcpu; |
| 713 | |
| 714 | ASSERT_LWKT_TOKEN_HELD(&vm_token); |
| 715 | |
| 716 | /* |
| 717 | * We can use PTmap if the pmap is our current address space or |
| 718 | * the kernel address space. |
| 719 | */ |
| 720 | if (pmap == &kernel_pmap || frame == (((unsigned) PTDpde) & PG_FRAME)) { |
| 721 | return (unsigned *) PTmap; |
| 722 | } |
| 723 | |
| 724 | /* |
| 725 | * Otherwise we use the per-cpu alternative page table map. Each |
| 726 | * cpu gets its own map. Because of this we cannot use this map |
| 727 | * from interrupts or threads which can preempt. |
| 728 | * |
| 729 | * Even if we already have the map cached we may still have to |
| 730 | * invalidate the TLB if another cpu modified a PDE in the map. |
| 731 | */ |
| 732 | KKASSERT(gd->mi.gd_intr_nesting_level == 0 && |
| 733 | (gd->mi.gd_curthread->td_flags & TDF_INTTHREAD) == 0); |
| 734 | |
| 735 | if ((*gd->gd_GDMAP1 & PG_FRAME) != frame) { |
| 736 | *gd->gd_GDMAP1 = frame | PG_RW | PG_V; |
| 737 | pmap->pm_cached |= gd->mi.gd_cpumask; |
| 738 | cpu_invltlb(); |
| 739 | } else if ((pmap->pm_cached & gd->mi.gd_cpumask) == 0) { |
| 740 | pmap->pm_cached |= gd->mi.gd_cpumask; |
| 741 | cpu_invltlb(); |
| 742 | } else if (dreadful_invltlb) { |
| 743 | cpu_invltlb(); |
| 744 | } |
| 745 | return ((unsigned *)gd->gd_GDADDR1); |
| 746 | } |
| 747 | |
| 748 | /* |
| 749 | * pmap_extract: |
| 750 | * |
| 751 | * Extract the physical page address associated with the map/VA pair. |
| 752 | * |
| 753 | * The caller may hold vm_token if it desires non-blocking operation. |
| 754 | */ |
| 755 | vm_paddr_t |
| 756 | pmap_extract(pmap_t pmap, vm_offset_t va) |
| 757 | { |
| 758 | vm_offset_t rtval; |
| 759 | vm_offset_t pdirindex; |
| 760 | |
| 761 | lwkt_gettoken(&vm_token); |
| 762 | pdirindex = va >> PDRSHIFT; |
| 763 | if (pmap && (rtval = (unsigned) pmap->pm_pdir[pdirindex])) { |
| 764 | unsigned *pte; |
| 765 | if ((rtval & PG_PS) != 0) { |
| 766 | rtval &= ~(NBPDR - 1); |
| 767 | rtval |= va & (NBPDR - 1); |
| 768 | } else { |
| 769 | pte = get_ptbase(pmap) + i386_btop(va); |
| 770 | rtval = ((*pte & PG_FRAME) | (va & PAGE_MASK)); |
| 771 | } |
| 772 | } else { |
| 773 | rtval = 0; |
| 774 | } |
| 775 | lwkt_reltoken(&vm_token); |
| 776 | return rtval; |
| 777 | } |
| 778 | |
| 779 | /*************************************************** |
| 780 | * Low level mapping routines..... |
| 781 | ***************************************************/ |
| 782 | |
| 783 | /* |
| 784 | * Map a wired VM page to a KVA, fully SMP synchronized. |
| 785 | * |
| 786 | * No requirements, non blocking. |
| 787 | */ |
| 788 | void |
| 789 | pmap_kenter(vm_offset_t va, vm_paddr_t pa) |
| 790 | { |
| 791 | unsigned *pte; |
| 792 | unsigned npte; |
| 793 | pmap_inval_info info; |
| 794 | |
| 795 | pmap_inval_init(&info); |
| 796 | npte = pa | PG_RW | PG_V | pgeflag; |
| 797 | pte = (unsigned *)vtopte(va); |
| 798 | pmap_inval_interlock(&info, &kernel_pmap, va); |
| 799 | *pte = npte; |
| 800 | pmap_inval_deinterlock(&info, &kernel_pmap); |
| 801 | pmap_inval_done(&info); |
| 802 | } |
| 803 | |
| 804 | /* |
| 805 | * Map a wired VM page to a KVA, synchronized on current cpu only. |
| 806 | * |
| 807 | * No requirements, non blocking. |
| 808 | */ |
| 809 | void |
| 810 | pmap_kenter_quick(vm_offset_t va, vm_paddr_t pa) |
| 811 | { |
| 812 | unsigned *pte; |
| 813 | unsigned npte; |
| 814 | |
| 815 | npte = pa | PG_RW | PG_V | pgeflag; |
| 816 | pte = (unsigned *)vtopte(va); |
| 817 | *pte = npte; |
| 818 | cpu_invlpg((void *)va); |
| 819 | } |
| 820 | |
| 821 | /* |
| 822 | * Synchronize a previously entered VA on all cpus. |
| 823 | * |
| 824 | * No requirements, non blocking. |
| 825 | */ |
| 826 | void |
| 827 | pmap_kenter_sync(vm_offset_t va) |
| 828 | { |
| 829 | pmap_inval_info info; |
| 830 | |
| 831 | pmap_inval_init(&info); |
| 832 | pmap_inval_interlock(&info, &kernel_pmap, va); |
| 833 | pmap_inval_deinterlock(&info, &kernel_pmap); |
| 834 | pmap_inval_done(&info); |
| 835 | } |
| 836 | |
| 837 | /* |
| 838 | * Synchronize a previously entered VA on the current cpu only. |
| 839 | * |
| 840 | * No requirements, non blocking. |
| 841 | */ |
| 842 | void |
| 843 | pmap_kenter_sync_quick(vm_offset_t va) |
| 844 | { |
| 845 | cpu_invlpg((void *)va); |
| 846 | } |
| 847 | |
| 848 | /* |
| 849 | * Remove a page from the kernel pagetables, fully SMP synchronized. |
| 850 | * |
| 851 | * No requirements, non blocking. |
| 852 | */ |
| 853 | void |
| 854 | pmap_kremove(vm_offset_t va) |
| 855 | { |
| 856 | unsigned *pte; |
| 857 | pmap_inval_info info; |
| 858 | |
| 859 | pmap_inval_init(&info); |
| 860 | pte = (unsigned *)vtopte(va); |
| 861 | pmap_inval_interlock(&info, &kernel_pmap, va); |
| 862 | *pte = 0; |
| 863 | pmap_inval_deinterlock(&info, &kernel_pmap); |
| 864 | pmap_inval_done(&info); |
| 865 | } |
| 866 | |
| 867 | /* |
| 868 | * Remove a page from the kernel pagetables, synchronized on current cpu only. |
| 869 | * |
| 870 | * No requirements, non blocking. |
| 871 | */ |
| 872 | void |
| 873 | pmap_kremove_quick(vm_offset_t va) |
| 874 | { |
| 875 | unsigned *pte; |
| 876 | pte = (unsigned *)vtopte(va); |
| 877 | *pte = 0; |
| 878 | cpu_invlpg((void *)va); |
| 879 | } |
| 880 | |
| 881 | /* |
| 882 | * Adjust the permissions of a page in the kernel page table, |
| 883 | * synchronized on the current cpu only. |
| 884 | * |
| 885 | * No requirements, non blocking. |
| 886 | */ |
| 887 | void |
| 888 | pmap_kmodify_rw(vm_offset_t va) |
| 889 | { |
| 890 | atomic_set_int(vtopte(va), PG_RW); |
| 891 | cpu_invlpg((void *)va); |
| 892 | } |
| 893 | |
| 894 | /* |
| 895 | * Adjust the permissions of a page in the kernel page table, |
| 896 | * synchronized on the current cpu only. |
| 897 | * |
| 898 | * No requirements, non blocking. |
| 899 | */ |
| 900 | void |
| 901 | pmap_kmodify_nc(vm_offset_t va) |
| 902 | { |
| 903 | atomic_set_int(vtopte(va), PG_N); |
| 904 | cpu_invlpg((void *)va); |
| 905 | } |
| 906 | |
| 907 | /* |
| 908 | * Map a range of physical addresses into kernel virtual address space. |
| 909 | * |
| 910 | * No requirements, non blocking. |
| 911 | */ |
| 912 | vm_offset_t |
| 913 | pmap_map(vm_offset_t *virtp, vm_paddr_t start, vm_paddr_t end, int prot) |
| 914 | { |
| 915 | vm_offset_t sva, virt; |
| 916 | |
| 917 | sva = virt = *virtp; |
| 918 | while (start < end) { |
| 919 | pmap_kenter(virt, start); |
| 920 | virt += PAGE_SIZE; |
| 921 | start += PAGE_SIZE; |
| 922 | } |
| 923 | *virtp = virt; |
| 924 | return (sva); |
| 925 | } |
| 926 | |
| 927 | /* |
| 928 | * Add a list of wired pages to the kva, fully SMP synchronized. |
| 929 | * |
| 930 | * No requirements, non blocking. |
| 931 | */ |
| 932 | void |
| 933 | pmap_qenter(vm_offset_t va, vm_page_t *m, int count) |
| 934 | { |
| 935 | vm_offset_t end_va; |
| 936 | |
| 937 | end_va = va + count * PAGE_SIZE; |
| 938 | |
| 939 | while (va < end_va) { |
| 940 | unsigned *pte; |
| 941 | |
| 942 | pte = (unsigned *)vtopte(va); |
| 943 | *pte = VM_PAGE_TO_PHYS(*m) | PG_RW | PG_V | pgeflag; |
| 944 | cpu_invlpg((void *)va); |
| 945 | va += PAGE_SIZE; |
| 946 | m++; |
| 947 | } |
| 948 | #ifdef SMP |
| 949 | smp_invltlb(); /* XXX */ |
| 950 | #endif |
| 951 | } |
| 952 | |
| 953 | /* |
| 954 | * Remove pages from KVA, fully SMP synchronized. |
| 955 | * |
| 956 | * No requirements, non blocking. |
| 957 | */ |
| 958 | void |
| 959 | pmap_qremove(vm_offset_t va, int count) |
| 960 | { |
| 961 | vm_offset_t end_va; |
| 962 | |
| 963 | end_va = va + count*PAGE_SIZE; |
| 964 | |
| 965 | while (va < end_va) { |
| 966 | unsigned *pte; |
| 967 | |
| 968 | pte = (unsigned *)vtopte(va); |
| 969 | *pte = 0; |
| 970 | cpu_invlpg((void *)va); |
| 971 | va += PAGE_SIZE; |
| 972 | } |
| 973 | #ifdef SMP |
| 974 | smp_invltlb(); |
| 975 | #endif |
| 976 | } |
| 977 | |
| 978 | /* |
| 979 | * This routine works like vm_page_lookup() but also blocks as long as the |
| 980 | * page is busy. This routine does not busy the page it returns. |
| 981 | * |
| 982 | * The caller must hold the object. |
| 983 | */ |
| 984 | static vm_page_t |
| 985 | pmap_page_lookup(vm_object_t object, vm_pindex_t pindex) |
| 986 | { |
| 987 | vm_page_t m; |
| 988 | |
| 989 | ASSERT_LWKT_TOKEN_HELD(vm_object_token(object)); |
| 990 | m = vm_page_lookup_busy_wait(object, pindex, FALSE, "pplookp"); |
| 991 | |
| 992 | return(m); |
| 993 | } |
| 994 | |
| 995 | /* |
| 996 | * Create a new thread and optionally associate it with a (new) process. |
| 997 | * NOTE! the new thread's cpu may not equal the current cpu. |
| 998 | */ |
| 999 | void |
| 1000 | pmap_init_thread(thread_t td) |
| 1001 | { |
| 1002 | /* enforce pcb placement */ |
| 1003 | td->td_pcb = (struct pcb *)(td->td_kstack + td->td_kstack_size) - 1; |
| 1004 | td->td_savefpu = &td->td_pcb->pcb_save; |
| 1005 | td->td_sp = (char *)td->td_pcb - 16; |
| 1006 | } |
| 1007 | |
| 1008 | /* |
| 1009 | * This routine directly affects the fork perf for a process. |
| 1010 | */ |
| 1011 | void |
| 1012 | pmap_init_proc(struct proc *p) |
| 1013 | { |
| 1014 | } |
| 1015 | |
| 1016 | /*************************************************** |
| 1017 | * Page table page management routines..... |
| 1018 | ***************************************************/ |
| 1019 | |
| 1020 | /* |
| 1021 | * This routine unwires page table pages, removing and freeing the page |
| 1022 | * tale page when the wire count drops to 0. |
| 1023 | * |
| 1024 | * The caller must hold vm_token. |
| 1025 | * This function can block. |
| 1026 | */ |
| 1027 | static int |
| 1028 | _pmap_unwire_pte(pmap_t pmap, vm_page_t m, pmap_inval_info_t info) |
| 1029 | { |
| 1030 | /* |
| 1031 | * Wait until we can busy the page ourselves. We cannot have |
| 1032 | * any active flushes if we block. |
| 1033 | */ |
| 1034 | vm_page_busy_wait(m, FALSE, "pmuwpt"); |
| 1035 | KASSERT(m->queue == PQ_NONE, |
| 1036 | ("_pmap_unwire_pte: %p->queue != PQ_NONE", m)); |
| 1037 | |
| 1038 | if (m->wire_count == 1) { |
| 1039 | /* |
| 1040 | * Unmap the page table page. |
| 1041 | * |
| 1042 | * NOTE: We must clear pm_cached for all cpus, including |
| 1043 | * the current one, when clearing a page directory |
| 1044 | * entry. |
| 1045 | */ |
| 1046 | pmap_inval_interlock(info, pmap, -1); |
| 1047 | KKASSERT(pmap->pm_pdir[m->pindex]); |
| 1048 | pmap->pm_pdir[m->pindex] = 0; |
| 1049 | pmap->pm_cached = 0; |
| 1050 | pmap_inval_deinterlock(info, pmap); |
| 1051 | |
| 1052 | KKASSERT(pmap->pm_stats.resident_count > 0); |
| 1053 | --pmap->pm_stats.resident_count; |
| 1054 | |
| 1055 | if (pmap->pm_ptphint == m) |
| 1056 | pmap->pm_ptphint = NULL; |
| 1057 | |
| 1058 | /* |
| 1059 | * This was our last hold, the page had better be unwired |
| 1060 | * after we decrement wire_count. |
| 1061 | * |
| 1062 | * FUTURE NOTE: shared page directory page could result in |
| 1063 | * multiple wire counts. |
| 1064 | */ |
| 1065 | vm_page_unwire(m, 0); |
| 1066 | vm_page_flag_clear(m, PG_MAPPED | PG_WRITEABLE); |
| 1067 | vm_page_flash(m); |
| 1068 | vm_page_free_zero(m); |
| 1069 | return 1; |
| 1070 | } else { |
| 1071 | KKASSERT(m->wire_count > 1); |
| 1072 | if (vm_page_unwire_quick(m)) |
| 1073 | panic("pmap_unwire_pte: Insufficient wire_count"); |
| 1074 | vm_page_wakeup(m); |
| 1075 | return 0; |
| 1076 | } |
| 1077 | } |
| 1078 | |
| 1079 | /* |
| 1080 | * The caller must hold vm_token. |
| 1081 | * |
| 1082 | * This function can block. |
| 1083 | * |
| 1084 | * This function can race the wire_count 2->1 case because the page |
| 1085 | * is not busied during the unwire_quick operation. An eventual |
| 1086 | * pmap_release() will catch the case. |
| 1087 | */ |
| 1088 | static PMAP_INLINE int |
| 1089 | pmap_unwire_pte(pmap_t pmap, vm_page_t m, pmap_inval_info_t info) |
| 1090 | { |
| 1091 | KKASSERT(m->wire_count > 0); |
| 1092 | if (m->wire_count > 1) { |
| 1093 | if (vm_page_unwire_quick(m)) |
| 1094 | panic("pmap_unwire_pte: Insufficient wire_count"); |
| 1095 | return 0; |
| 1096 | } else { |
| 1097 | return _pmap_unwire_pte(pmap, m, info); |
| 1098 | } |
| 1099 | } |
| 1100 | |
| 1101 | /* |
| 1102 | * After removing a (user) page table entry, this routine is used to |
| 1103 | * conditionally free the page, and manage the hold/wire counts. |
| 1104 | * |
| 1105 | * The caller must hold vm_token. |
| 1106 | * This function can block regardless. |
| 1107 | */ |
| 1108 | static int |
| 1109 | pmap_unuse_pt(pmap_t pmap, vm_offset_t va, vm_page_t mpte, |
| 1110 | pmap_inval_info_t info) |
| 1111 | { |
| 1112 | unsigned ptepindex; |
| 1113 | |
| 1114 | ASSERT_LWKT_TOKEN_HELD(vm_object_token(pmap->pm_pteobj)); |
| 1115 | |
| 1116 | if (va >= UPT_MIN_ADDRESS) |
| 1117 | return 0; |
| 1118 | |
| 1119 | if (mpte == NULL) { |
| 1120 | ptepindex = (va >> PDRSHIFT); |
| 1121 | if ((mpte = pmap->pm_ptphint) != NULL && |
| 1122 | mpte->pindex == ptepindex && |
| 1123 | (mpte->flags & PG_BUSY) == 0) { |
| 1124 | ; /* use mpte */ |
| 1125 | } else { |
| 1126 | mpte = pmap_page_lookup(pmap->pm_pteobj, ptepindex); |
| 1127 | pmap->pm_ptphint = mpte; |
| 1128 | vm_page_wakeup(mpte); |
| 1129 | } |
| 1130 | } |
| 1131 | |
| 1132 | return pmap_unwire_pte(pmap, mpte, info); |
| 1133 | } |
| 1134 | |
| 1135 | /* |
| 1136 | * Initialize pmap0/vmspace0. This pmap is not added to pmap_list because |
| 1137 | * it, and IdlePTD, represents the template used to update all other pmaps. |
| 1138 | * |
| 1139 | * On architectures where the kernel pmap is not integrated into the user |
| 1140 | * process pmap, this pmap represents the process pmap, not the kernel pmap. |
| 1141 | * kernel_pmap should be used to directly access the kernel_pmap. |
| 1142 | * |
| 1143 | * No requirements. |
| 1144 | */ |
| 1145 | void |
| 1146 | pmap_pinit0(struct pmap *pmap) |
| 1147 | { |
| 1148 | pmap->pm_pdir = |
| 1149 | (pd_entry_t *)kmem_alloc_pageable(&kernel_map, PAGE_SIZE); |
| 1150 | pmap_kenter((vm_offset_t)pmap->pm_pdir, (vm_offset_t) IdlePTD); |
| 1151 | pmap->pm_count = 1; |
| 1152 | pmap->pm_active = 0; |
| 1153 | pmap->pm_cached = 0; |
| 1154 | pmap->pm_ptphint = NULL; |
| 1155 | TAILQ_INIT(&pmap->pm_pvlist); |
| 1156 | TAILQ_INIT(&pmap->pm_pvlist_free); |
| 1157 | spin_init(&pmap->pm_spin); |
| 1158 | lwkt_token_init(&pmap->pm_token, "pmap_tok"); |
| 1159 | bzero(&pmap->pm_stats, sizeof pmap->pm_stats); |
| 1160 | } |
| 1161 | |
| 1162 | /* |
| 1163 | * Initialize a preallocated and zeroed pmap structure, |
| 1164 | * such as one in a vmspace structure. |
| 1165 | * |
| 1166 | * No requirements. |
| 1167 | */ |
| 1168 | void |
| 1169 | pmap_pinit(struct pmap *pmap) |
| 1170 | { |
| 1171 | vm_page_t ptdpg; |
| 1172 | |
| 1173 | /* |
| 1174 | * No need to allocate page table space yet but we do need a valid |
| 1175 | * page directory table. |
| 1176 | */ |
| 1177 | if (pmap->pm_pdir == NULL) { |
| 1178 | pmap->pm_pdir = |
| 1179 | (pd_entry_t *)kmem_alloc_pageable(&kernel_map, PAGE_SIZE); |
| 1180 | } |
| 1181 | |
| 1182 | /* |
| 1183 | * Allocate an object for the ptes |
| 1184 | */ |
| 1185 | if (pmap->pm_pteobj == NULL) |
| 1186 | pmap->pm_pteobj = vm_object_allocate(OBJT_DEFAULT, PTDPTDI + 1); |
| 1187 | |
| 1188 | /* |
| 1189 | * Allocate the page directory page, unless we already have |
| 1190 | * one cached. If we used the cached page the wire_count will |
| 1191 | * already be set appropriately. |
| 1192 | */ |
| 1193 | if ((ptdpg = pmap->pm_pdirm) == NULL) { |
| 1194 | ptdpg = vm_page_grab(pmap->pm_pteobj, PTDPTDI, |
| 1195 | VM_ALLOC_NORMAL | VM_ALLOC_RETRY | |
| 1196 | VM_ALLOC_ZERO); |
| 1197 | pmap->pm_pdirm = ptdpg; |
| 1198 | vm_page_flag_clear(ptdpg, PG_MAPPED); |
| 1199 | vm_page_wire(ptdpg); |
| 1200 | KKASSERT(ptdpg->valid == VM_PAGE_BITS_ALL); |
| 1201 | pmap_kenter((vm_offset_t)pmap->pm_pdir, VM_PAGE_TO_PHYS(ptdpg)); |
| 1202 | vm_page_wakeup(ptdpg); |
| 1203 | } |
| 1204 | pmap->pm_pdir[MPPTDI] = PTD[MPPTDI]; |
| 1205 | |
| 1206 | /* install self-referential address mapping entry */ |
| 1207 | *(unsigned *) (pmap->pm_pdir + PTDPTDI) = |
| 1208 | VM_PAGE_TO_PHYS(ptdpg) | PG_V | PG_RW | PG_A | PG_M; |
| 1209 | |
| 1210 | pmap->pm_count = 1; |
| 1211 | pmap->pm_active = 0; |
| 1212 | pmap->pm_cached = 0; |
| 1213 | pmap->pm_ptphint = NULL; |
| 1214 | TAILQ_INIT(&pmap->pm_pvlist); |
| 1215 | TAILQ_INIT(&pmap->pm_pvlist_free); |
| 1216 | spin_init(&pmap->pm_spin); |
| 1217 | lwkt_token_init(&pmap->pm_token, "pmap_tok"); |
| 1218 | bzero(&pmap->pm_stats, sizeof pmap->pm_stats); |
| 1219 | pmap->pm_stats.resident_count = 1; |
| 1220 | } |
| 1221 | |
| 1222 | /* |
| 1223 | * Clean up a pmap structure so it can be physically freed. This routine |
| 1224 | * is called by the vmspace dtor function. A great deal of pmap data is |
| 1225 | * left passively mapped to improve vmspace management so we have a bit |
| 1226 | * of cleanup work to do here. |
| 1227 | * |
| 1228 | * No requirements. |
| 1229 | */ |
| 1230 | void |
| 1231 | pmap_puninit(pmap_t pmap) |
| 1232 | { |
| 1233 | vm_page_t p; |
| 1234 | |
| 1235 | KKASSERT(pmap->pm_active == 0); |
| 1236 | if ((p = pmap->pm_pdirm) != NULL) { |
| 1237 | KKASSERT(pmap->pm_pdir != NULL); |
| 1238 | pmap_kremove((vm_offset_t)pmap->pm_pdir); |
| 1239 | vm_page_busy_wait(p, FALSE, "pgpun"); |
| 1240 | vm_page_unwire(p, 0); |
| 1241 | vm_page_free_zero(p); |
| 1242 | pmap->pm_pdirm = NULL; |
| 1243 | } |
| 1244 | if (pmap->pm_pdir) { |
| 1245 | kmem_free(&kernel_map, (vm_offset_t)pmap->pm_pdir, PAGE_SIZE); |
| 1246 | pmap->pm_pdir = NULL; |
| 1247 | } |
| 1248 | if (pmap->pm_pteobj) { |
| 1249 | vm_object_deallocate(pmap->pm_pteobj); |
| 1250 | pmap->pm_pteobj = NULL; |
| 1251 | } |
| 1252 | } |
| 1253 | |
| 1254 | /* |
| 1255 | * Wire in kernel global address entries. To avoid a race condition |
| 1256 | * between pmap initialization and pmap_growkernel, this procedure |
| 1257 | * adds the pmap to the master list (which growkernel scans to update), |
| 1258 | * then copies the template. |
| 1259 | * |
| 1260 | * No requirements. |
| 1261 | */ |
| 1262 | void |
| 1263 | pmap_pinit2(struct pmap *pmap) |
| 1264 | { |
| 1265 | /* |
| 1266 | * XXX copies current process, does not fill in MPPTDI |
| 1267 | */ |
| 1268 | spin_lock(&pmap_spin); |
| 1269 | TAILQ_INSERT_TAIL(&pmap_list, pmap, pm_pmnode); |
| 1270 | bcopy(PTD + KPTDI, pmap->pm_pdir + KPTDI, nkpt * PTESIZE); |
| 1271 | spin_unlock(&pmap_spin); |
| 1272 | } |
| 1273 | |
| 1274 | /* |
| 1275 | * Attempt to release and free a vm_page in a pmap. Returns 1 on success, |
| 1276 | * 0 on failure (if the procedure had to sleep). |
| 1277 | * |
| 1278 | * When asked to remove the page directory page itself, we actually just |
| 1279 | * leave it cached so we do not have to incur the SMP inval overhead of |
| 1280 | * removing the kernel mapping. pmap_puninit() will take care of it. |
| 1281 | * |
| 1282 | * The caller must hold vm_token. |
| 1283 | * This function can block regardless. |
| 1284 | */ |
| 1285 | static int |
| 1286 | pmap_release_free_page(struct pmap *pmap, vm_page_t p) |
| 1287 | { |
| 1288 | unsigned *pde = (unsigned *) pmap->pm_pdir; |
| 1289 | |
| 1290 | /* |
| 1291 | * This code optimizes the case of freeing non-busy |
| 1292 | * page-table pages. Those pages are zero now, and |
| 1293 | * might as well be placed directly into the zero queue. |
| 1294 | */ |
| 1295 | if (vm_page_busy_try(p, FALSE)) { |
| 1296 | vm_page_sleep_busy(p, FALSE, "pmaprl"); |
| 1297 | return 0; |
| 1298 | } |
| 1299 | |
| 1300 | KKASSERT(pmap->pm_stats.resident_count > 0); |
| 1301 | KKASSERT(pde[p->pindex]); |
| 1302 | |
| 1303 | /* |
| 1304 | * page table page's wire_count must be 1. Caller is the pmap |
| 1305 | * termination code which holds the pm_pteobj, there is a race |
| 1306 | * if someone else is trying to hold the VM object in order to |
| 1307 | * clean up a wire_count. |
| 1308 | */ |
| 1309 | if (p->wire_count != 1) { |
| 1310 | if (pmap->pm_pteobj->hold_count <= 1) |
| 1311 | panic("pmap_release: freeing wired page table page"); |
| 1312 | kprintf("pmap_release_free_page: unwire race detected\n"); |
| 1313 | vm_page_wakeup(p); |
| 1314 | tsleep(p, 0, "pmapx", 1); |
| 1315 | return 0; |
| 1316 | } |
| 1317 | |
| 1318 | /* |
| 1319 | * Remove the page table page from the processes address space. |
| 1320 | */ |
| 1321 | pmap->pm_cached = 0; |
| 1322 | pde[p->pindex] = 0; |
| 1323 | --pmap->pm_stats.resident_count; |
| 1324 | if (pmap->pm_ptphint && (pmap->pm_ptphint->pindex == p->pindex)) |
| 1325 | pmap->pm_ptphint = NULL; |
| 1326 | |
| 1327 | /* |
| 1328 | * We leave the page directory page cached, wired, and mapped in |
| 1329 | * the pmap until the dtor function (pmap_puninit()) gets called. |
| 1330 | * However, still clean it up so we can set PG_ZERO. |
| 1331 | * |
| 1332 | * The pmap has already been removed from the pmap_list in the |
| 1333 | * PTDPTDI case. |
| 1334 | */ |
| 1335 | if (p->pindex == PTDPTDI) { |
| 1336 | bzero(pde + KPTDI, nkpt * PTESIZE); |
| 1337 | bzero(pde + MPPTDI, (NPDEPG - MPPTDI) * PTESIZE); |
| 1338 | vm_page_flag_set(p, PG_ZERO); |
| 1339 | vm_page_wakeup(p); |
| 1340 | } else { |
| 1341 | /* |
| 1342 | * This case can occur if a pmap_unwire_pte() loses a race |
| 1343 | * while the page is unbusied. |
| 1344 | */ |
| 1345 | /*panic("pmap_release: page should already be gone %p", p);*/ |
| 1346 | vm_page_flag_clear(p, PG_MAPPED); |
| 1347 | vm_page_unwire(p, 0); |
| 1348 | vm_page_free_zero(p); |
| 1349 | } |
| 1350 | return 1; |
| 1351 | } |
| 1352 | |
| 1353 | /* |
| 1354 | * This routine is called if the page table page is not mapped correctly. |
| 1355 | * |
| 1356 | * The caller must hold vm_token. |
| 1357 | */ |
| 1358 | static vm_page_t |
| 1359 | _pmap_allocpte(pmap_t pmap, unsigned ptepindex) |
| 1360 | { |
| 1361 | vm_offset_t ptepa; |
| 1362 | vm_page_t m; |
| 1363 | |
| 1364 | /* |
| 1365 | * Find or fabricate a new pagetable page. Setting VM_ALLOC_ZERO |
| 1366 | * will zero any new page and mark it valid. |
| 1367 | */ |
| 1368 | m = vm_page_grab(pmap->pm_pteobj, ptepindex, |
| 1369 | VM_ALLOC_NORMAL | VM_ALLOC_ZERO | VM_ALLOC_RETRY); |
| 1370 | |
| 1371 | KASSERT(m->queue == PQ_NONE, |
| 1372 | ("_pmap_allocpte: %p->queue != PQ_NONE", m)); |
| 1373 | |
| 1374 | /* |
| 1375 | * Increment the wire count for the page we will be returning to |
| 1376 | * the caller. |
| 1377 | */ |
| 1378 | vm_page_wire(m); |
| 1379 | |
| 1380 | /* |
| 1381 | * It is possible that someone else got in and mapped by the page |
| 1382 | * directory page while we were blocked, if so just unbusy and |
| 1383 | * return the wired page. |
| 1384 | */ |
| 1385 | if ((ptepa = pmap->pm_pdir[ptepindex]) != 0) { |
| 1386 | KKASSERT((ptepa & PG_FRAME) == VM_PAGE_TO_PHYS(m)); |
| 1387 | vm_page_wakeup(m); |
| 1388 | return(m); |
| 1389 | } |
| 1390 | |
| 1391 | /* |
| 1392 | * Map the pagetable page into the process address space, if |
| 1393 | * it isn't already there. |
| 1394 | * |
| 1395 | * NOTE: For safety clear pm_cached for all cpus including the |
| 1396 | * current one when adding a PDE to the map. |
| 1397 | */ |
| 1398 | ++pmap->pm_stats.resident_count; |
| 1399 | |
| 1400 | ptepa = VM_PAGE_TO_PHYS(m); |
| 1401 | pmap->pm_pdir[ptepindex] = |
| 1402 | (pd_entry_t) (ptepa | PG_U | PG_RW | PG_V | PG_A | PG_M); |
| 1403 | pmap->pm_cached = 0; |
| 1404 | |
| 1405 | /* |
| 1406 | * Set the page table hint |
| 1407 | */ |
| 1408 | pmap->pm_ptphint = m; |
| 1409 | vm_page_flag_set(m, PG_MAPPED); |
| 1410 | vm_page_wakeup(m); |
| 1411 | |
| 1412 | return m; |
| 1413 | } |
| 1414 | |
| 1415 | /* |
| 1416 | * Allocate a page table entry for a va. |
| 1417 | * |
| 1418 | * The caller must hold vm_token. |
| 1419 | */ |
| 1420 | static vm_page_t |
| 1421 | pmap_allocpte(pmap_t pmap, vm_offset_t va) |
| 1422 | { |
| 1423 | unsigned ptepindex; |
| 1424 | vm_offset_t ptepa; |
| 1425 | vm_page_t mpte; |
| 1426 | |
| 1427 | ASSERT_LWKT_TOKEN_HELD(vm_object_token(pmap->pm_pteobj)); |
| 1428 | |
| 1429 | /* |
| 1430 | * Calculate pagetable page index |
| 1431 | */ |
| 1432 | ptepindex = va >> PDRSHIFT; |
| 1433 | |
| 1434 | /* |
| 1435 | * Get the page directory entry |
| 1436 | */ |
| 1437 | ptepa = (vm_offset_t) pmap->pm_pdir[ptepindex]; |
| 1438 | |
| 1439 | /* |
| 1440 | * This supports switching from a 4MB page to a |
| 1441 | * normal 4K page. |
| 1442 | */ |
| 1443 | if (ptepa & PG_PS) { |
| 1444 | pmap->pm_pdir[ptepindex] = 0; |
| 1445 | ptepa = 0; |
| 1446 | smp_invltlb(); |
| 1447 | cpu_invltlb(); |
| 1448 | } |
| 1449 | |
| 1450 | /* |
| 1451 | * If the page table page is mapped, we just increment the |
| 1452 | * wire count, and activate it. |
| 1453 | */ |
| 1454 | if (ptepa) { |
| 1455 | /* |
| 1456 | * In order to get the page table page, try the |
| 1457 | * hint first. |
| 1458 | */ |
| 1459 | if ((mpte = pmap->pm_ptphint) != NULL && |
| 1460 | (mpte->pindex == ptepindex) && |
| 1461 | (mpte->flags & PG_BUSY) == 0) { |
| 1462 | vm_page_wire_quick(mpte); |
| 1463 | } else { |
| 1464 | mpte = pmap_page_lookup(pmap->pm_pteobj, ptepindex); |
| 1465 | pmap->pm_ptphint = mpte; |
| 1466 | vm_page_wire_quick(mpte); |
| 1467 | vm_page_wakeup(mpte); |
| 1468 | } |
| 1469 | return mpte; |
| 1470 | } |
| 1471 | /* |
| 1472 | * Here if the pte page isn't mapped, or if it has been deallocated. |
| 1473 | */ |
| 1474 | return _pmap_allocpte(pmap, ptepindex); |
| 1475 | } |
| 1476 | |
| 1477 | |
| 1478 | /*************************************************** |
| 1479 | * Pmap allocation/deallocation routines. |
| 1480 | ***************************************************/ |
| 1481 | |
| 1482 | /* |
| 1483 | * Release any resources held by the given physical map. |
| 1484 | * Called when a pmap initialized by pmap_pinit is being released. |
| 1485 | * Should only be called if the map contains no valid mappings. |
| 1486 | * |
| 1487 | * Caller must hold pmap->pm_token |
| 1488 | */ |
| 1489 | static int pmap_release_callback(struct vm_page *p, void *data); |
| 1490 | |
| 1491 | void |
| 1492 | pmap_release(struct pmap *pmap) |
| 1493 | { |
| 1494 | vm_object_t object = pmap->pm_pteobj; |
| 1495 | struct rb_vm_page_scan_info info; |
| 1496 | |
| 1497 | KASSERT(pmap->pm_active == 0, |
| 1498 | ("pmap still active! %08x", pmap->pm_active)); |
| 1499 | #if defined(DIAGNOSTIC) |
| 1500 | if (object->ref_count != 1) |
| 1501 | panic("pmap_release: pteobj reference count != 1"); |
| 1502 | #endif |
| 1503 | |
| 1504 | info.pmap = pmap; |
| 1505 | info.object = object; |
| 1506 | |
| 1507 | spin_lock(&pmap_spin); |
| 1508 | TAILQ_REMOVE(&pmap_list, pmap, pm_pmnode); |
| 1509 | spin_unlock(&pmap_spin); |
| 1510 | |
| 1511 | vm_object_hold(object); |
| 1512 | do { |
| 1513 | info.error = 0; |
| 1514 | info.mpte = NULL; |
| 1515 | info.limit = object->generation; |
| 1516 | |
| 1517 | vm_page_rb_tree_RB_SCAN(&object->rb_memq, NULL, |
| 1518 | pmap_release_callback, &info); |
| 1519 | if (info.error == 0 && info.mpte) { |
| 1520 | if (!pmap_release_free_page(pmap, info.mpte)) |
| 1521 | info.error = 1; |
| 1522 | } |
| 1523 | } while (info.error); |
| 1524 | vm_object_drop(object); |
| 1525 | |
| 1526 | pmap->pm_cached = 0; |
| 1527 | } |
| 1528 | |
| 1529 | /* |
| 1530 | * The caller must hold vm_token. |
| 1531 | */ |
| 1532 | static int |
| 1533 | pmap_release_callback(struct vm_page *p, void *data) |
| 1534 | { |
| 1535 | struct rb_vm_page_scan_info *info = data; |
| 1536 | |
| 1537 | if (p->pindex == PTDPTDI) { |
| 1538 | info->mpte = p; |
| 1539 | return(0); |
| 1540 | } |
| 1541 | if (!pmap_release_free_page(info->pmap, p)) { |
| 1542 | info->error = 1; |
| 1543 | return(-1); |
| 1544 | } |
| 1545 | if (info->object->generation != info->limit) { |
| 1546 | info->error = 1; |
| 1547 | return(-1); |
| 1548 | } |
| 1549 | return(0); |
| 1550 | } |
| 1551 | |
| 1552 | /* |
| 1553 | * Grow the number of kernel page table entries, if needed. |
| 1554 | * |
| 1555 | * No requirements. |
| 1556 | */ |
| 1557 | void |
| 1558 | pmap_growkernel(vm_offset_t kstart, vm_offset_t kend) |
| 1559 | { |
| 1560 | vm_offset_t addr = kend; |
| 1561 | struct pmap *pmap; |
| 1562 | vm_offset_t ptppaddr; |
| 1563 | vm_page_t nkpg; |
| 1564 | pd_entry_t newpdir; |
| 1565 | |
| 1566 | vm_object_hold(kptobj); |
| 1567 | if (kernel_vm_end == 0) { |
| 1568 | kernel_vm_end = KERNBASE; |
| 1569 | nkpt = 0; |
| 1570 | while (pdir_pde(PTD, kernel_vm_end)) { |
| 1571 | kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & |
| 1572 | ~(PAGE_SIZE * NPTEPG - 1); |
| 1573 | nkpt++; |
| 1574 | } |
| 1575 | } |
| 1576 | addr = (addr + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); |
| 1577 | while (kernel_vm_end < addr) { |
| 1578 | if (pdir_pde(PTD, kernel_vm_end)) { |
| 1579 | kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & |
| 1580 | ~(PAGE_SIZE * NPTEPG - 1); |
| 1581 | continue; |
| 1582 | } |
| 1583 | |
| 1584 | /* |
| 1585 | * This index is bogus, but out of the way |
| 1586 | */ |
| 1587 | nkpg = vm_page_alloc(kptobj, nkpt, VM_ALLOC_NORMAL | |
| 1588 | VM_ALLOC_SYSTEM | |
| 1589 | VM_ALLOC_INTERRUPT); |
| 1590 | if (nkpg == NULL) |
| 1591 | panic("pmap_growkernel: no memory to grow kernel"); |
| 1592 | |
| 1593 | vm_page_wire(nkpg); |
| 1594 | ptppaddr = VM_PAGE_TO_PHYS(nkpg); |
| 1595 | pmap_zero_page(ptppaddr); |
| 1596 | newpdir = (pd_entry_t) (ptppaddr | PG_V | PG_RW | PG_A | PG_M); |
| 1597 | pdir_pde(PTD, kernel_vm_end) = newpdir; |
| 1598 | *pmap_pde(&kernel_pmap, kernel_vm_end) = newpdir; |
| 1599 | nkpt++; |
| 1600 | |
| 1601 | /* |
| 1602 | * This update must be interlocked with pmap_pinit2. |
| 1603 | */ |
| 1604 | spin_lock(&pmap_spin); |
| 1605 | TAILQ_FOREACH(pmap, &pmap_list, pm_pmnode) { |
| 1606 | *pmap_pde(pmap, kernel_vm_end) = newpdir; |
| 1607 | } |
| 1608 | spin_unlock(&pmap_spin); |
| 1609 | kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & |
| 1610 | ~(PAGE_SIZE * NPTEPG - 1); |
| 1611 | } |
| 1612 | vm_object_drop(kptobj); |
| 1613 | } |
| 1614 | |
| 1615 | /* |
| 1616 | * Retire the given physical map from service. |
| 1617 | * |
| 1618 | * Should only be called if the map contains no valid mappings. |
| 1619 | * |
| 1620 | * No requirements. |
| 1621 | */ |
| 1622 | void |
| 1623 | pmap_destroy(pmap_t pmap) |
| 1624 | { |
| 1625 | if (pmap == NULL) |
| 1626 | return; |
| 1627 | |
| 1628 | lwkt_gettoken(&vm_token); |
| 1629 | if (--pmap->pm_count == 0) { |
| 1630 | pmap_release(pmap); |
| 1631 | panic("destroying a pmap is not yet implemented"); |
| 1632 | } |
| 1633 | lwkt_reltoken(&vm_token); |
| 1634 | } |
| 1635 | |
| 1636 | /* |
| 1637 | * Add a reference to the specified pmap. |
| 1638 | * |
| 1639 | * No requirements. |
| 1640 | */ |
| 1641 | void |
| 1642 | pmap_reference(pmap_t pmap) |
| 1643 | { |
| 1644 | if (pmap) { |
| 1645 | lwkt_gettoken(&vm_token); |
| 1646 | ++pmap->pm_count; |
| 1647 | lwkt_reltoken(&vm_token); |
| 1648 | } |
| 1649 | } |
| 1650 | |
| 1651 | /*************************************************** |
| 1652 | * page management routines. |
| 1653 | ***************************************************/ |
| 1654 | |
| 1655 | /* |
| 1656 | * free the pv_entry back to the free list. This function may be |
| 1657 | * called from an interrupt. |
| 1658 | * |
| 1659 | * The caller must hold vm_token. |
| 1660 | */ |
| 1661 | static PMAP_INLINE void |
| 1662 | free_pv_entry(pv_entry_t pv) |
| 1663 | { |
| 1664 | struct mdglobaldata *gd; |
| 1665 | |
| 1666 | #ifdef PMAP_DEBUG |
| 1667 | KKASSERT(pv->pv_m != NULL); |
| 1668 | pv->pv_m = NULL; |
| 1669 | #endif |
| 1670 | gd = mdcpu; |
| 1671 | pv_entry_count--; |
| 1672 | if (gd->gd_freepv == NULL) |
| 1673 | gd->gd_freepv = pv; |
| 1674 | else |
| 1675 | zfree(pvzone, pv); |
| 1676 | } |
| 1677 | |
| 1678 | /* |
| 1679 | * get a new pv_entry, allocating a block from the system |
| 1680 | * when needed. This function may be called from an interrupt thread. |
| 1681 | * |
| 1682 | * THIS FUNCTION CAN BLOCK ON THE ZALLOC TOKEN, serialization of other |
| 1683 | * tokens (aka vm_token) to be temporarily lost. |
| 1684 | * |
| 1685 | * The caller must hold vm_token. |
| 1686 | */ |
| 1687 | static pv_entry_t |
| 1688 | get_pv_entry(void) |
| 1689 | { |
| 1690 | struct mdglobaldata *gd; |
| 1691 | pv_entry_t pv; |
| 1692 | |
| 1693 | pv_entry_count++; |
| 1694 | if (pv_entry_high_water && |
| 1695 | (pv_entry_count > pv_entry_high_water) && |
| 1696 | (pmap_pagedaemon_waken == 0)) { |
| 1697 | pmap_pagedaemon_waken = 1; |
| 1698 | wakeup (&vm_pages_needed); |
| 1699 | } |
| 1700 | gd = mdcpu; |
| 1701 | if ((pv = gd->gd_freepv) != NULL) |
| 1702 | gd->gd_freepv = NULL; |
| 1703 | else |
| 1704 | pv = zalloc(pvzone); |
| 1705 | return pv; |
| 1706 | } |
| 1707 | |
| 1708 | /* |
| 1709 | * This routine is very drastic, but can save the system |
| 1710 | * in a pinch. |
| 1711 | * |
| 1712 | * No requirements. |
| 1713 | */ |
| 1714 | void |
| 1715 | pmap_collect(void) |
| 1716 | { |
| 1717 | int i; |
| 1718 | vm_page_t m; |
| 1719 | static int warningdone=0; |
| 1720 | |
| 1721 | if (pmap_pagedaemon_waken == 0) |
| 1722 | return; |
| 1723 | lwkt_gettoken(&vm_token); |
| 1724 | pmap_pagedaemon_waken = 0; |
| 1725 | |
| 1726 | if (warningdone < 5) { |
| 1727 | kprintf("pmap_collect: collecting pv entries -- " |
| 1728 | "suggest increasing PMAP_SHPGPERPROC\n"); |
| 1729 | warningdone++; |
| 1730 | } |
| 1731 | |
| 1732 | for (i = 0; i < vm_page_array_size; i++) { |
| 1733 | m = &vm_page_array[i]; |
| 1734 | if (m->wire_count || m->hold_count) |
| 1735 | continue; |
| 1736 | if (vm_page_busy_try(m, TRUE) == 0) { |
| 1737 | if (m->wire_count == 0 && m->hold_count == 0) { |
| 1738 | pmap_remove_all(m); |
| 1739 | } |
| 1740 | vm_page_wakeup(m); |
| 1741 | } |
| 1742 | } |
| 1743 | lwkt_reltoken(&vm_token); |
| 1744 | } |
| 1745 | |
| 1746 | |
| 1747 | /* |
| 1748 | * Remove the pv entry and unwire the page table page related to the |
| 1749 | * pte the caller has cleared from the page table. |
| 1750 | * |
| 1751 | * The caller must hold vm_token. |
| 1752 | */ |
| 1753 | static int |
| 1754 | pmap_remove_entry(struct pmap *pmap, vm_page_t m, |
| 1755 | vm_offset_t va, pmap_inval_info_t info) |
| 1756 | { |
| 1757 | pv_entry_t pv; |
| 1758 | int rtval; |
| 1759 | |
| 1760 | /* |
| 1761 | * Cannot block |
| 1762 | */ |
| 1763 | ASSERT_LWKT_TOKEN_HELD(&vm_token); |
| 1764 | if (m->md.pv_list_count < pmap->pm_stats.resident_count) { |
| 1765 | TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { |
| 1766 | if (pmap == pv->pv_pmap && va == pv->pv_va) |
| 1767 | break; |
| 1768 | } |
| 1769 | } else { |
| 1770 | TAILQ_FOREACH(pv, &pmap->pm_pvlist, pv_plist) { |
| 1771 | #ifdef PMAP_DEBUG |
| 1772 | KKASSERT(pv->pv_pmap == pmap); |
| 1773 | #endif |
| 1774 | if (va == pv->pv_va) |
| 1775 | break; |
| 1776 | } |
| 1777 | } |
| 1778 | KKASSERT(pv); |
| 1779 | |
| 1780 | /* |
| 1781 | * Cannot block |
| 1782 | */ |
| 1783 | rtval = 0; |
| 1784 | test_m_maps_pv(m, pv); |
| 1785 | TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); |
| 1786 | m->md.pv_list_count--; |
| 1787 | if (m->object) |
| 1788 | atomic_add_int(&m->object->agg_pv_list_count, -1); |
| 1789 | if (TAILQ_EMPTY(&m->md.pv_list)) |
| 1790 | vm_page_flag_clear(m, PG_MAPPED | PG_WRITEABLE); |
| 1791 | TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist); |
| 1792 | ++pmap->pm_generation; |
| 1793 | |
| 1794 | /* |
| 1795 | * This can block. |
| 1796 | */ |
| 1797 | vm_object_hold(pmap->pm_pteobj); |
| 1798 | rtval = pmap_unuse_pt(pmap, va, pv->pv_ptem, info); |
| 1799 | vm_object_drop(pmap->pm_pteobj); |
| 1800 | free_pv_entry(pv); |
| 1801 | |
| 1802 | return rtval; |
| 1803 | } |
| 1804 | |
| 1805 | /* |
| 1806 | * Create a pv entry for page at pa for (pmap, va). |
| 1807 | * |
| 1808 | * The caller must hold vm_token. |
| 1809 | */ |
| 1810 | static void |
| 1811 | pmap_insert_entry(pmap_t pmap, pv_entry_t pv, vm_offset_t va, |
| 1812 | vm_page_t mpte, vm_page_t m) |
| 1813 | { |
| 1814 | #ifdef PMAP_DEBUG |
| 1815 | KKASSERT(pv->pv_m == NULL); |
| 1816 | pv->pv_m = m; |
| 1817 | #endif |
| 1818 | pv->pv_va = va; |
| 1819 | pv->pv_pmap = pmap; |
| 1820 | pv->pv_ptem = mpte; |
| 1821 | |
| 1822 | TAILQ_INSERT_TAIL(&pmap->pm_pvlist, pv, pv_plist); |
| 1823 | TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); |
| 1824 | ++pmap->pm_generation; |
| 1825 | m->md.pv_list_count++; |
| 1826 | if (m->object) |
| 1827 | atomic_add_int(&m->object->agg_pv_list_count, 1); |
| 1828 | } |
| 1829 | |
| 1830 | /* |
| 1831 | * pmap_remove_pte: do the things to unmap a page in a process. |
| 1832 | * |
| 1833 | * The caller must hold vm_token. |
| 1834 | * |
| 1835 | * WARNING! As with most other pmap functions this one can block, so |
| 1836 | * callers using temporary page table mappings must reload |
| 1837 | * them. |
| 1838 | */ |
| 1839 | static int |
| 1840 | pmap_remove_pte(struct pmap *pmap, unsigned *ptq, vm_offset_t va, |
| 1841 | pmap_inval_info_t info) |
| 1842 | { |
| 1843 | unsigned oldpte; |
| 1844 | vm_page_t m; |
| 1845 | |
| 1846 | ptbase_assert(pmap); |
| 1847 | pmap_inval_interlock(info, pmap, va); |
| 1848 | ptbase_assert(pmap); |
| 1849 | oldpte = loadandclear(ptq); |
| 1850 | if (oldpte & PG_W) |
| 1851 | pmap->pm_stats.wired_count -= 1; |
| 1852 | pmap_inval_deinterlock(info, pmap); |
| 1853 | KKASSERT(oldpte & PG_V); |
| 1854 | /* |
| 1855 | * Machines that don't support invlpg, also don't support |
| 1856 | * PG_G. XXX PG_G is disabled for SMP so don't worry about |
| 1857 | * the SMP case. |
| 1858 | */ |
| 1859 | if (oldpte & PG_G) |
| 1860 | cpu_invlpg((void *)va); |
| 1861 | KKASSERT(pmap->pm_stats.resident_count > 0); |
| 1862 | --pmap->pm_stats.resident_count; |
| 1863 | if (oldpte & PG_MANAGED) { |
| 1864 | m = PHYS_TO_VM_PAGE(oldpte); |
| 1865 | if (oldpte & PG_M) { |
| 1866 | #if defined(PMAP_DIAGNOSTIC) |
| 1867 | if (pmap_nw_modified((pt_entry_t) oldpte)) { |
| 1868 | kprintf("pmap_remove: modified page not " |
| 1869 | "writable: va: %p, pte: 0x%lx\n", |
| 1870 | (void *)va, (long)oldpte); |
| 1871 | } |
| 1872 | #endif |
| 1873 | if (pmap_track_modified(va)) |
| 1874 | vm_page_dirty(m); |
| 1875 | } |
| 1876 | if (oldpte & PG_A) |
| 1877 | vm_page_flag_set(m, PG_REFERENCED); |
| 1878 | return pmap_remove_entry(pmap, m, va, info); |
| 1879 | } else { |
| 1880 | return pmap_unuse_pt(pmap, va, NULL, info); |
| 1881 | } |
| 1882 | |
| 1883 | return 0; |
| 1884 | } |
| 1885 | |
| 1886 | /* |
| 1887 | * Remove a single page from a process address space. |
| 1888 | * |
| 1889 | * The caller must hold vm_token. |
| 1890 | */ |
| 1891 | static void |
| 1892 | pmap_remove_page(struct pmap *pmap, vm_offset_t va, pmap_inval_info_t info) |
| 1893 | { |
| 1894 | unsigned *ptq; |
| 1895 | |
| 1896 | /* |
| 1897 | * If there is no pte for this address, just skip it!!! Otherwise |
| 1898 | * get a local va for mappings for this pmap and remove the entry. |
| 1899 | */ |
| 1900 | if (*pmap_pde(pmap, va) != 0) { |
| 1901 | ptq = get_ptbase(pmap) + i386_btop(va); |
| 1902 | if (*ptq) { |
| 1903 | pmap_remove_pte(pmap, ptq, va, info); |
| 1904 | /* ptq invalid */ |
| 1905 | } |
| 1906 | } |
| 1907 | } |
| 1908 | |
| 1909 | /* |
| 1910 | * Remove the given range of addresses from the specified map. |
| 1911 | * |
| 1912 | * It is assumed that the start and end are properly rounded to the page |
| 1913 | * size. |
| 1914 | * |
| 1915 | * No requirements. |
| 1916 | */ |
| 1917 | void |
| 1918 | pmap_remove(struct pmap *pmap, vm_offset_t sva, vm_offset_t eva) |
| 1919 | { |
| 1920 | unsigned *ptbase; |
| 1921 | vm_offset_t pdnxt; |
| 1922 | vm_offset_t ptpaddr; |
| 1923 | vm_offset_t sindex, eindex; |
| 1924 | struct pmap_inval_info info; |
| 1925 | |
| 1926 | if (pmap == NULL) |
| 1927 | return; |
| 1928 | |
| 1929 | vm_object_hold(pmap->pm_pteobj); |
| 1930 | lwkt_gettoken(&vm_token); |
| 1931 | if (pmap->pm_stats.resident_count == 0) { |
| 1932 | lwkt_reltoken(&vm_token); |
| 1933 | vm_object_drop(pmap->pm_pteobj); |
| 1934 | return; |
| 1935 | } |
| 1936 | |
| 1937 | pmap_inval_init(&info); |
| 1938 | |
| 1939 | /* |
| 1940 | * special handling of removing one page. a very |
| 1941 | * common operation and easy to short circuit some |
| 1942 | * code. |
| 1943 | */ |
| 1944 | if (((sva + PAGE_SIZE) == eva) && |
| 1945 | (((unsigned) pmap->pm_pdir[(sva >> PDRSHIFT)] & PG_PS) == 0)) { |
| 1946 | pmap_remove_page(pmap, sva, &info); |
| 1947 | pmap_inval_done(&info); |
| 1948 | lwkt_reltoken(&vm_token); |
| 1949 | vm_object_drop(pmap->pm_pteobj); |
| 1950 | return; |
| 1951 | } |
| 1952 | |
| 1953 | /* |
| 1954 | * Get a local virtual address for the mappings that are being |
| 1955 | * worked with. |
| 1956 | */ |
| 1957 | sindex = i386_btop(sva); |
| 1958 | eindex = i386_btop(eva); |
| 1959 | |
| 1960 | for (; sindex < eindex; sindex = pdnxt) { |
| 1961 | unsigned pdirindex; |
| 1962 | |
| 1963 | /* |
| 1964 | * Calculate index for next page table. |
| 1965 | */ |
| 1966 | pdnxt = ((sindex + NPTEPG) & ~(NPTEPG - 1)); |
| 1967 | if (pmap->pm_stats.resident_count == 0) |
| 1968 | break; |
| 1969 | |
| 1970 | pdirindex = sindex / NPDEPG; |
| 1971 | if (((ptpaddr = (unsigned) pmap->pm_pdir[pdirindex]) & PG_PS) != 0) { |
| 1972 | pmap_inval_interlock(&info, pmap, -1); |
| 1973 | pmap->pm_pdir[pdirindex] = 0; |
| 1974 | pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; |
| 1975 | pmap->pm_cached = 0; |
| 1976 | pmap_inval_deinterlock(&info, pmap); |
| 1977 | continue; |
| 1978 | } |
| 1979 | |
| 1980 | /* |
| 1981 | * Weed out invalid mappings. Note: we assume that the page |
| 1982 | * directory table is always allocated, and in kernel virtual. |
| 1983 | */ |
| 1984 | if (ptpaddr == 0) |
| 1985 | continue; |
| 1986 | |
| 1987 | /* |
| 1988 | * Limit our scan to either the end of the va represented |
| 1989 | * by the current page table page, or to the end of the |
| 1990 | * range being removed. |
| 1991 | */ |
| 1992 | if (pdnxt > eindex) { |
| 1993 | pdnxt = eindex; |
| 1994 | } |
| 1995 | |
| 1996 | /* |
| 1997 | * NOTE: pmap_remove_pte() can block and wipe the temporary |
| 1998 | * ptbase. |
| 1999 | */ |
| 2000 | for (; sindex != pdnxt; sindex++) { |
| 2001 | vm_offset_t va; |
| 2002 | |
| 2003 | ptbase = get_ptbase(pmap); |
| 2004 | if (ptbase[sindex] == 0) |
| 2005 | continue; |
| 2006 | va = i386_ptob(sindex); |
| 2007 | if (pmap_remove_pte(pmap, ptbase + sindex, va, &info)) |
| 2008 | break; |
| 2009 | } |
| 2010 | } |
| 2011 | pmap_inval_done(&info); |
| 2012 | lwkt_reltoken(&vm_token); |
| 2013 | vm_object_drop(pmap->pm_pteobj); |
| 2014 | } |
| 2015 | |
| 2016 | /* |
| 2017 | * Removes this physical page from all physical maps in which it resides. |
| 2018 | * Reflects back modify bits to the pager. |
| 2019 | * |
| 2020 | * No requirements. |
| 2021 | */ |
| 2022 | static void |
| 2023 | pmap_remove_all(vm_page_t m) |
| 2024 | { |
| 2025 | struct pmap_inval_info info; |
| 2026 | unsigned *pte, tpte; |
| 2027 | pv_entry_t pv; |
| 2028 | |
| 2029 | if (!pmap_initialized || (m->flags & PG_FICTITIOUS)) |
| 2030 | return; |
| 2031 | |
| 2032 | pmap_inval_init(&info); |
| 2033 | while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) { |
| 2034 | KKASSERT(pv->pv_pmap->pm_stats.resident_count > 0); |
| 2035 | --pv->pv_pmap->pm_stats.resident_count; |
| 2036 | |
| 2037 | pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); |
| 2038 | pmap_inval_interlock(&info, pv->pv_pmap, pv->pv_va); |
| 2039 | tpte = loadandclear(pte); |
| 2040 | if (tpte & PG_W) |
| 2041 | pv->pv_pmap->pm_stats.wired_count--; |
| 2042 | pmap_inval_deinterlock(&info, pv->pv_pmap); |
| 2043 | if (tpte & PG_A) |
| 2044 | vm_page_flag_set(m, PG_REFERENCED); |
| 2045 | #ifdef PMAP_DEBUG |
| 2046 | KKASSERT(PHYS_TO_VM_PAGE(tpte) == m); |
| 2047 | #endif |
| 2048 | |
| 2049 | /* |
| 2050 | * Update the vm_page_t clean and reference bits. |
| 2051 | */ |
| 2052 | if (tpte & PG_M) { |
| 2053 | #if defined(PMAP_DIAGNOSTIC) |
| 2054 | if (pmap_nw_modified((pt_entry_t) tpte)) { |
| 2055 | kprintf("pmap_remove_all: modified page " |
| 2056 | "not writable: va: %p, pte: 0x%lx\n", |
| 2057 | (void *)pv->pv_va, (long)tpte); |
| 2058 | } |
| 2059 | #endif |
| 2060 | if (pmap_track_modified(pv->pv_va)) |
| 2061 | vm_page_dirty(m); |
| 2062 | } |
| 2063 | #ifdef PMAP_DEBUG |
| 2064 | KKASSERT(pv->pv_m == m); |
| 2065 | #endif |
| 2066 | KKASSERT(pv == TAILQ_FIRST(&m->md.pv_list)); |
| 2067 | TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); |
| 2068 | TAILQ_REMOVE(&pv->pv_pmap->pm_pvlist, pv, pv_plist); |
| 2069 | ++pv->pv_pmap->pm_generation; |
| 2070 | m->md.pv_list_count--; |
| 2071 | if (m->object) |
| 2072 | atomic_add_int(&m->object->agg_pv_list_count, -1); |
| 2073 | if (TAILQ_EMPTY(&m->md.pv_list)) |
| 2074 | vm_page_flag_clear(m, PG_MAPPED | PG_WRITEABLE); |
| 2075 | vm_object_hold(pv->pv_pmap->pm_pteobj); |
| 2076 | pmap_unuse_pt(pv->pv_pmap, pv->pv_va, pv->pv_ptem, &info); |
| 2077 | vm_object_drop(pv->pv_pmap->pm_pteobj); |
| 2078 | free_pv_entry(pv); |
| 2079 | } |
| 2080 | KKASSERT((m->flags & (PG_MAPPED|PG_WRITEABLE)) == 0); |
| 2081 | pmap_inval_done(&info); |
| 2082 | } |
| 2083 | |
| 2084 | /* |
| 2085 | * Set the physical protection on the specified range of this map |
| 2086 | * as requested. |
| 2087 | * |
| 2088 | * No requirements. |
| 2089 | */ |
| 2090 | void |
| 2091 | pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot) |
| 2092 | { |
| 2093 | unsigned *ptbase; |
| 2094 | vm_offset_t pdnxt, ptpaddr; |
| 2095 | vm_pindex_t sindex, eindex; |
| 2096 | pmap_inval_info info; |
| 2097 | |
| 2098 | if (pmap == NULL) |
| 2099 | return; |
| 2100 | |
| 2101 | if ((prot & VM_PROT_READ) == VM_PROT_NONE) { |
| 2102 | pmap_remove(pmap, sva, eva); |
| 2103 | return; |
| 2104 | } |
| 2105 | |
| 2106 | if (prot & VM_PROT_WRITE) |
| 2107 | return; |
| 2108 | |
| 2109 | lwkt_gettoken(&vm_token); |
| 2110 | pmap_inval_init(&info); |
| 2111 | |
| 2112 | ptbase = get_ptbase(pmap); |
| 2113 | |
| 2114 | sindex = i386_btop(sva); |
| 2115 | eindex = i386_btop(eva); |
| 2116 | |
| 2117 | for (; sindex < eindex; sindex = pdnxt) { |
| 2118 | unsigned pdirindex; |
| 2119 | |
| 2120 | pdnxt = ((sindex + NPTEPG) & ~(NPTEPG - 1)); |
| 2121 | |
| 2122 | pdirindex = sindex / NPDEPG; |
| 2123 | if (((ptpaddr = (unsigned) pmap->pm_pdir[pdirindex]) & PG_PS) != 0) { |
| 2124 | pmap_inval_interlock(&info, pmap, -1); |
| 2125 | pmap->pm_pdir[pdirindex] &= ~(PG_M|PG_RW); |
| 2126 | pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; |
| 2127 | pmap_inval_deinterlock(&info, pmap); |
| 2128 | continue; |
| 2129 | } |
| 2130 | |
| 2131 | /* |
| 2132 | * Weed out invalid mappings. Note: we assume that the page |
| 2133 | * directory table is always allocated, and in kernel virtual. |
| 2134 | */ |
| 2135 | if (ptpaddr == 0) |
| 2136 | continue; |
| 2137 | |
| 2138 | if (pdnxt > eindex) { |
| 2139 | pdnxt = eindex; |
| 2140 | } |
| 2141 | |
| 2142 | for (; sindex != pdnxt; sindex++) { |
| 2143 | unsigned pbits; |
| 2144 | unsigned cbits; |
| 2145 | vm_page_t m; |
| 2146 | |
| 2147 | /* |
| 2148 | * XXX non-optimal. |
| 2149 | */ |
| 2150 | pmap_inval_interlock(&info, pmap, i386_ptob(sindex)); |
| 2151 | again: |
| 2152 | pbits = ptbase[sindex]; |
| 2153 | cbits = pbits; |
| 2154 | |
| 2155 | if (pbits & PG_MANAGED) { |
| 2156 | m = NULL; |
| 2157 | if (pbits & PG_A) { |
| 2158 | m = PHYS_TO_VM_PAGE(pbits); |
| 2159 | vm_page_flag_set(m, PG_REFERENCED); |
| 2160 | cbits &= ~PG_A; |
| 2161 | } |
| 2162 | if (pbits & PG_M) { |
| 2163 | if (pmap_track_modified(i386_ptob(sindex))) { |
| 2164 | if (m == NULL) |
| 2165 | m = PHYS_TO_VM_PAGE(pbits); |
| 2166 | vm_page_dirty(m); |
| 2167 | cbits &= ~PG_M; |
| 2168 | } |
| 2169 | } |
| 2170 | } |
| 2171 | cbits &= ~PG_RW; |
| 2172 | if (pbits != cbits && |
| 2173 | !atomic_cmpset_int(ptbase + sindex, pbits, cbits)) { |
| 2174 | goto again; |
| 2175 | } |
| 2176 | pmap_inval_deinterlock(&info, pmap); |
| 2177 | } |
| 2178 | } |
| 2179 | pmap_inval_done(&info); |
| 2180 | lwkt_reltoken(&vm_token); |
| 2181 | } |
| 2182 | |
| 2183 | /* |
| 2184 | * Insert the given physical page (p) at the specified virtual address (v) |
| 2185 | * in the target physical map with the protection requested. |
| 2186 | * |
| 2187 | * If specified, the page will be wired down, meaning that the related pte |
| 2188 | * cannot be reclaimed. |
| 2189 | * |
| 2190 | * No requirements. |
| 2191 | */ |
| 2192 | void |
| 2193 | pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot, |
| 2194 | boolean_t wired) |
| 2195 | { |
| 2196 | vm_paddr_t pa; |
| 2197 | unsigned *pte; |
| 2198 | vm_paddr_t opa; |
| 2199 | vm_offset_t origpte, newpte; |
| 2200 | vm_page_t mpte; |
| 2201 | pmap_inval_info info; |
| 2202 | pv_entry_t pv; |
| 2203 | |
| 2204 | if (pmap == NULL) |
| 2205 | return; |
| 2206 | |
| 2207 | va &= PG_FRAME; |
| 2208 | #ifdef PMAP_DIAGNOSTIC |
| 2209 | if (va >= KvaEnd) |
| 2210 | panic("pmap_enter: toobig"); |
| 2211 | if ((va >= UPT_MIN_ADDRESS) && (va < UPT_MAX_ADDRESS)) { |
| 2212 | panic("pmap_enter: invalid to pmap_enter page " |
| 2213 | "table pages (va: %p)", (void *)va); |
| 2214 | } |
| 2215 | #endif |
| 2216 | if (va < UPT_MAX_ADDRESS && pmap == &kernel_pmap) { |
| 2217 | kprintf("Warning: pmap_enter called on UVA with kernel_pmap\n"); |
| 2218 | print_backtrace(-1); |
| 2219 | } |
| 2220 | if (va >= UPT_MAX_ADDRESS && pmap != &kernel_pmap) { |
| 2221 | kprintf("Warning: pmap_enter called on KVA without kernel_pmap\n"); |
| 2222 | print_backtrace(-1); |
| 2223 | } |
| 2224 | |
| 2225 | vm_object_hold(pmap->pm_pteobj); |
| 2226 | lwkt_gettoken(&vm_token); |
| 2227 | |
| 2228 | /* |
| 2229 | * This can block, get it before we do anything important. |
| 2230 | */ |
| 2231 | if (pmap_initialized && |
| 2232 | (m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) == 0) { |
| 2233 | pv = get_pv_entry(); |
| 2234 | } else { |
| 2235 | pv = NULL; |
| 2236 | } |
| 2237 | |
| 2238 | /* |
| 2239 | * In the case that a page table page is not |
| 2240 | * resident, we are creating it here. |
| 2241 | */ |
| 2242 | if (va < UPT_MIN_ADDRESS) |
| 2243 | mpte = pmap_allocpte(pmap, va); |
| 2244 | else |
| 2245 | mpte = NULL; |
| 2246 | |
| 2247 | if ((prot & VM_PROT_NOSYNC) == 0) |
| 2248 | pmap_inval_init(&info); |
| 2249 | pte = pmap_pte(pmap, va); |
| 2250 | |
| 2251 | /* |
| 2252 | * Page Directory table entry not valid, we need a new PT page |
| 2253 | */ |
| 2254 | if (pte == NULL) { |
| 2255 | panic("pmap_enter: invalid page directory pdir=0x%lx, va=%p", |
| 2256 | (long)pmap->pm_pdir[PTDPTDI], (void *)va); |
| 2257 | } |
| 2258 | |
| 2259 | pa = VM_PAGE_TO_PHYS(m) & PG_FRAME; |
| 2260 | origpte = *(vm_offset_t *)pte; |
| 2261 | opa = origpte & PG_FRAME; |
| 2262 | |
| 2263 | if (origpte & PG_PS) |
| 2264 | panic("pmap_enter: attempted pmap_enter on 4MB page"); |
| 2265 | |
| 2266 | /* |
| 2267 | * Mapping has not changed, must be protection or wiring change. |
| 2268 | */ |
| 2269 | if (origpte && (opa == pa)) { |
| 2270 | /* |
| 2271 | * Wiring change, just update stats. We don't worry about |
| 2272 | * wiring PT pages as they remain resident as long as there |
| 2273 | * are valid mappings in them. Hence, if a user page is wired, |
| 2274 | * the PT page will be also. |
| 2275 | */ |
| 2276 | if (wired && ((origpte & PG_W) == 0)) |
| 2277 | pmap->pm_stats.wired_count++; |
| 2278 | else if (!wired && (origpte & PG_W)) |
| 2279 | pmap->pm_stats.wired_count--; |
| 2280 | |
| 2281 | #if defined(PMAP_DIAGNOSTIC) |
| 2282 | if (pmap_nw_modified((pt_entry_t) origpte)) { |
| 2283 | kprintf("pmap_enter: modified page not " |
| 2284 | "writable: va: %p, pte: 0x%lx\n", |
| 2285 | (void *)va, (long )origpte); |
| 2286 | } |
| 2287 | #endif |
| 2288 | |
| 2289 | /* |
| 2290 | * We might be turning off write access to the page, |
| 2291 | * so we go ahead and sense modify status. |
| 2292 | */ |
| 2293 | if (origpte & PG_MANAGED) { |
| 2294 | if ((origpte & PG_M) && pmap_track_modified(va)) { |
| 2295 | vm_page_t om; |
| 2296 | om = PHYS_TO_VM_PAGE(opa); |
| 2297 | vm_page_dirty(om); |
| 2298 | } |
| 2299 | pa |= PG_MANAGED; |
| 2300 | KKASSERT(m->flags & PG_MAPPED); |
| 2301 | } |
| 2302 | goto validate; |
| 2303 | } |
| 2304 | /* |
| 2305 | * Mapping has changed, invalidate old range and fall through to |
| 2306 | * handle validating new mapping. |
| 2307 | * |
| 2308 | * Since we have a ref on the page directory page pmap_pte() |
| 2309 | * will always return non-NULL. |
| 2310 | * |
| 2311 | * NOTE: pmap_remove_pte() can block and cause the temporary ptbase |
| 2312 | * to get wiped. reload the ptbase. I'm not sure if it is |
| 2313 | * also possible to race another pmap_enter() but check for |
| 2314 | * that case too. |
| 2315 | */ |
| 2316 | while (opa) { |
| 2317 | int err; |
| 2318 | |
| 2319 | KKASSERT((origpte & PG_FRAME) == |
| 2320 | (*(vm_offset_t *)pte & PG_FRAME)); |
| 2321 | err = pmap_remove_pte(pmap, pte, va, &info); |
| 2322 | if (err) |
| 2323 | panic("pmap_enter: pte vanished, va: %p", (void *)va); |
| 2324 | pte = pmap_pte(pmap, va); |
| 2325 | origpte = *(vm_offset_t *)pte; |
| 2326 | opa = origpte & PG_FRAME; |
| 2327 | if (opa) { |
| 2328 | kprintf("pmap_enter: Warning, raced pmap %p va %p\n", |
| 2329 | pmap, (void *)va); |
| 2330 | } |
| 2331 | } |
| 2332 | |
| 2333 | /* |
| 2334 | * Enter on the PV list if part of our managed memory. Note that we |
| 2335 | * raise IPL while manipulating pv_table since pmap_enter can be |
| 2336 | * called at interrupt time. |
| 2337 | */ |
| 2338 | if (pmap_initialized && |
| 2339 | (m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) == 0) { |
| 2340 | pmap_insert_entry(pmap, pv, va, mpte, m); |
| 2341 | pv = NULL; |
| 2342 | ptbase_assert(pmap); |
| 2343 | pa |= PG_MANAGED; |
| 2344 | vm_page_flag_set(m, PG_MAPPED); |
| 2345 | } |
| 2346 | |
| 2347 | /* |
| 2348 | * Increment counters |
| 2349 | */ |
| 2350 | ++pmap->pm_stats.resident_count; |
| 2351 | if (wired) |
| 2352 | pmap->pm_stats.wired_count++; |
| 2353 | KKASSERT(*pte == 0); |
| 2354 | |
| 2355 | validate: |
| 2356 | /* |
| 2357 | * Now validate mapping with desired protection/wiring. |
| 2358 | */ |
| 2359 | ptbase_assert(pmap); |
| 2360 | newpte = (vm_offset_t) (pa | pte_prot(pmap, prot) | PG_V); |
| 2361 | |
| 2362 | if (wired) |
| 2363 | newpte |= PG_W; |
| 2364 | if (va < UPT_MIN_ADDRESS) |
| 2365 | newpte |= PG_U; |
| 2366 | if (pmap == &kernel_pmap) |
| 2367 | newpte |= pgeflag; |
| 2368 | |
| 2369 | /* |
| 2370 | * If the mapping or permission bits are different, we need |
| 2371 | * to update the pte. If the pte is already present we have |
| 2372 | * to get rid of the extra wire-count on mpte we had obtained |
| 2373 | * above. |
| 2374 | * |
| 2375 | * mpte has a new wire_count, which also serves to prevent the |
| 2376 | * page table page from getting ripped out while we work. If we |
| 2377 | * are modifying an existing pte instead of installing a new one |
| 2378 | * we have to drop it. |
| 2379 | */ |
| 2380 | if ((origpte & ~(PG_M|PG_A)) != newpte) { |
| 2381 | if (prot & VM_PROT_NOSYNC) |
| 2382 | cpu_invlpg((void *)va); |
| 2383 | else |
| 2384 | pmap_inval_interlock(&info, pmap, va); |
| 2385 | ptbase_assert(pmap); |
| 2386 | |
| 2387 | if (*pte) { |
| 2388 | KKASSERT((*pte & PG_FRAME) == (newpte & PG_FRAME)); |
| 2389 | if (vm_page_unwire_quick(mpte)) |
| 2390 | panic("pmap_enter: Insufficient wire_count"); |
| 2391 | } |
| 2392 | |
| 2393 | *pte = newpte | PG_A; |
| 2394 | if ((prot & VM_PROT_NOSYNC) == 0) |
| 2395 | pmap_inval_deinterlock(&info, pmap); |
| 2396 | if (newpte & PG_RW) |
| 2397 | vm_page_flag_set(m, PG_WRITEABLE); |
| 2398 | } else { |
| 2399 | if (*pte) { |
| 2400 | KKASSERT((*pte & PG_FRAME) == (newpte & PG_FRAME)); |
| 2401 | if (vm_page_unwire_quick(mpte)) |
| 2402 | panic("pmap_enter: Insufficient wire_count"); |
| 2403 | } |
| 2404 | } |
| 2405 | |
| 2406 | /* |
| 2407 | * NOTE: mpte invalid after this point if we block. |
| 2408 | */ |
| 2409 | KKASSERT((newpte & PG_MANAGED) == 0 || (m->flags & PG_MAPPED)); |
| 2410 | if ((prot & VM_PROT_NOSYNC) == 0) |
| 2411 | pmap_inval_done(&info); |
| 2412 | if (pv) |
| 2413 | free_pv_entry(pv); |
| 2414 | lwkt_reltoken(&vm_token); |
| 2415 | vm_object_drop(pmap->pm_pteobj); |
| 2416 | } |
| 2417 | |
| 2418 | /* |
| 2419 | * This code works like pmap_enter() but assumes VM_PROT_READ and not-wired. |
| 2420 | * This code also assumes that the pmap has no pre-existing entry for this |
| 2421 | * VA. |
| 2422 | * |
| 2423 | * This code currently may only be used on user pmaps, not kernel_pmap. |
| 2424 | * |
| 2425 | * No requirements. |
| 2426 | */ |
| 2427 | void |
| 2428 | pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m) |
| 2429 | { |
| 2430 | unsigned *pte; |
| 2431 | vm_paddr_t pa; |
| 2432 | vm_page_t mpte; |
| 2433 | unsigned ptepindex; |
| 2434 | vm_offset_t ptepa; |
| 2435 | pmap_inval_info info; |
| 2436 | pv_entry_t pv; |
| 2437 | |
| 2438 | vm_object_hold(pmap->pm_pteobj); |
| 2439 | lwkt_gettoken(&vm_token); |
| 2440 | |
| 2441 | /* |
| 2442 | * This can block, get it before we do anything important. |
| 2443 | */ |
| 2444 | if (pmap_initialized && |
| 2445 | (m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) == 0) { |
| 2446 | pv = get_pv_entry(); |
| 2447 | } else { |
| 2448 | pv = NULL; |
| 2449 | } |
| 2450 | |
| 2451 | pmap_inval_init(&info); |
| 2452 | |
| 2453 | if (va < UPT_MAX_ADDRESS && pmap == &kernel_pmap) { |
| 2454 | kprintf("Warning: pmap_enter_quick called on UVA with kernel_pmap\n"); |
| 2455 | print_backtrace(-1); |
| 2456 | } |
| 2457 | if (va >= UPT_MAX_ADDRESS && pmap != &kernel_pmap) { |
| 2458 | kprintf("Warning: pmap_enter_quick called on KVA without kernel_pmap\n"); |
| 2459 | print_backtrace(-1); |
| 2460 | } |
| 2461 | |
| 2462 | KKASSERT(va < UPT_MIN_ADDRESS); /* assert used on user pmaps only */ |
| 2463 | |
| 2464 | /* |
| 2465 | * Calculate the page table page (mpte), allocating it if necessary. |
| 2466 | * |
| 2467 | * A held page table page (mpte), or NULL, is passed onto the |
| 2468 | * section following. |
| 2469 | */ |
| 2470 | if (va < UPT_MIN_ADDRESS) { |
| 2471 | /* |
| 2472 | * Calculate pagetable page index |
| 2473 | */ |
| 2474 | ptepindex = va >> PDRSHIFT; |
| 2475 | |
| 2476 | do { |
| 2477 | /* |
| 2478 | * Get the page directory entry |
| 2479 | */ |
| 2480 | ptepa = (vm_offset_t) pmap->pm_pdir[ptepindex]; |
| 2481 | |
| 2482 | /* |
| 2483 | * If the page table page is mapped, we just increment |
| 2484 | * the wire count, and activate it. |
| 2485 | */ |
| 2486 | if (ptepa) { |
| 2487 | if (ptepa & PG_PS) |
| 2488 | panic("pmap_enter_quick: unexpected mapping into 4MB page"); |
| 2489 | if ((mpte = pmap->pm_ptphint) != NULL && |
| 2490 | (mpte->pindex == ptepindex) && |
| 2491 | (mpte->flags & PG_BUSY) == 0) { |
| 2492 | vm_page_wire_quick(mpte); |
| 2493 | } else { |
| 2494 | mpte = pmap_page_lookup(pmap->pm_pteobj, |
| 2495 | ptepindex); |
| 2496 | pmap->pm_ptphint = mpte; |
| 2497 | vm_page_wire_quick(mpte); |
| 2498 | vm_page_wakeup(mpte); |
| 2499 | } |
| 2500 | } else { |
| 2501 | mpte = _pmap_allocpte(pmap, ptepindex); |
| 2502 | } |
| 2503 | } while (mpte == NULL); |
| 2504 | } else { |
| 2505 | mpte = NULL; |
| 2506 | /* this code path is not yet used */ |
| 2507 | } |
| 2508 | |
| 2509 | /* |
| 2510 | * With a valid (and held) page directory page, we can just use |
| 2511 | * vtopte() to get to the pte. If the pte is already present |
| 2512 | * we do not disturb it. |
| 2513 | */ |
| 2514 | pte = (unsigned *)vtopte(va); |
| 2515 | if (*pte & PG_V) { |
| 2516 | pa = VM_PAGE_TO_PHYS(m); |
| 2517 | KKASSERT(((*pte ^ pa) & PG_FRAME) == 0); |
| 2518 | pmap_inval_done(&info); |
| 2519 | if (mpte) |
| 2520 | pmap_unwire_pte(pmap, mpte, &info); |
| 2521 | lwkt_reltoken(&vm_token); |
| 2522 | vm_object_drop(pmap->pm_pteobj); |
| 2523 | if (pv) { |
| 2524 | free_pv_entry(pv); |
| 2525 | /* pv = NULL; */ |
| 2526 | } |
| 2527 | return; |
| 2528 | } |
| 2529 | |
| 2530 | /* |
| 2531 | * Enter on the PV list if part of our managed memory |
| 2532 | */ |
| 2533 | if (pmap_initialized && |
| 2534 | (m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) == 0) { |
| 2535 | pmap_insert_entry(pmap, pv, va, mpte, m); |
| 2536 | pv = NULL; |
| 2537 | vm_page_flag_set(m, PG_MAPPED); |
| 2538 | } |
| 2539 | |
| 2540 | /* |
| 2541 | * Increment counters |
| 2542 | */ |
| 2543 | ++pmap->pm_stats.resident_count; |
| 2544 | |
| 2545 | pa = VM_PAGE_TO_PHYS(m); |
| 2546 | |
| 2547 | /* |
| 2548 | * Now validate mapping with RO protection |
| 2549 | */ |
| 2550 | if (m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) |
| 2551 | *pte = pa | PG_V | PG_U; |
| 2552 | else |
| 2553 | *pte = pa | PG_V | PG_U | PG_MANAGED; |
| 2554 | /* pmap_inval_add(&info, pmap, va); shouldn't be needed inval->valid */ |
| 2555 | pmap_inval_done(&info); |
| 2556 | if (pv) { |
| 2557 | free_pv_entry(pv); |
| 2558 | /* pv = NULL; */ |
| 2559 | } |
| 2560 | lwkt_reltoken(&vm_token); |
| 2561 | vm_object_drop(pmap->pm_pteobj); |
| 2562 | } |
| 2563 | |
| 2564 | /* |
| 2565 | * Make a temporary mapping for a physical address. This is only intended |
| 2566 | * to be used for panic dumps. |
| 2567 | * |
| 2568 | * The caller is responsible for calling smp_invltlb(). |
| 2569 | * |
| 2570 | * No requirements. |
| 2571 | */ |
| 2572 | void * |
| 2573 | pmap_kenter_temporary(vm_paddr_t pa, long i) |
| 2574 | { |
| 2575 | pmap_kenter_quick((vm_offset_t)crashdumpmap + (i * PAGE_SIZE), pa); |
| 2576 | return ((void *)crashdumpmap); |
| 2577 | } |
| 2578 | |
| 2579 | #define MAX_INIT_PT (96) |
| 2580 | |
| 2581 | /* |
| 2582 | * This routine preloads the ptes for a given object into the specified pmap. |
| 2583 | * This eliminates the blast of soft faults on process startup and |
| 2584 | * immediately after an mmap. |
| 2585 | * |
| 2586 | * No requirements. |
| 2587 | */ |
| 2588 | static int pmap_object_init_pt_callback(vm_page_t p, void *data); |
| 2589 | |
| 2590 | void |
| 2591 | pmap_object_init_pt(pmap_t pmap, vm_offset_t addr, vm_prot_t prot, |
| 2592 | vm_object_t object, vm_pindex_t pindex, |
| 2593 | vm_size_t size, int limit) |
| 2594 | { |
| 2595 | struct rb_vm_page_scan_info info; |
| 2596 | struct lwp *lp; |
| 2597 | int psize; |
| 2598 | |
| 2599 | /* |
| 2600 | * We can't preinit if read access isn't set or there is no pmap |
| 2601 | * or object. |
| 2602 | */ |
| 2603 | if ((prot & VM_PROT_READ) == 0 || pmap == NULL || object == NULL) |
| 2604 | return; |
| 2605 | |
| 2606 | /* |
| 2607 | * We can't preinit if the pmap is not the current pmap |
| 2608 | */ |
| 2609 | lp = curthread->td_lwp; |
| 2610 | if (lp == NULL || pmap != vmspace_pmap(lp->lwp_vmspace)) |
| 2611 | return; |
| 2612 | |
| 2613 | psize = i386_btop(size); |
| 2614 | |
| 2615 | if ((object->type != OBJT_VNODE) || |
| 2616 | ((limit & MAP_PREFAULT_PARTIAL) && (psize > MAX_INIT_PT) && |
| 2617 | (object->resident_page_count > MAX_INIT_PT))) { |
| 2618 | return; |
| 2619 | } |
| 2620 | |
| 2621 | if (psize + pindex > object->size) { |
| 2622 | if (object->size < pindex) |
| 2623 | return; |
| 2624 | psize = object->size - pindex; |
| 2625 | } |
| 2626 | |
| 2627 | if (psize == 0) |
| 2628 | return; |
| 2629 | |
| 2630 | /* |
| 2631 | * Use a red-black scan to traverse the requested range and load |
| 2632 | * any valid pages found into the pmap. |
| 2633 | * |
| 2634 | * We cannot safely scan the object's memq unless we are in a |
| 2635 | * critical section since interrupts can remove pages from objects. |
| 2636 | */ |
| 2637 | info.start_pindex = pindex; |
| 2638 | info.end_pindex = pindex + psize - 1; |
| 2639 | info.limit = limit; |
| 2640 | info.mpte = NULL; |
| 2641 | info.addr = addr; |
| 2642 | info.pmap = pmap; |
| 2643 | |
| 2644 | vm_object_hold(object); |
| 2645 | vm_page_rb_tree_RB_SCAN(&object->rb_memq, rb_vm_page_scancmp, |
| 2646 | pmap_object_init_pt_callback, &info); |
| 2647 | vm_object_drop(object); |
| 2648 | } |
| 2649 | |
| 2650 | /* |
| 2651 | * The caller must hold vm_token. |
| 2652 | */ |
| 2653 | static |
| 2654 | int |
| 2655 | pmap_object_init_pt_callback(vm_page_t p, void *data) |
| 2656 | { |
| 2657 | struct rb_vm_page_scan_info *info = data; |
| 2658 | vm_pindex_t rel_index; |
| 2659 | /* |
| 2660 | * don't allow an madvise to blow away our really |
| 2661 | * free pages allocating pv entries. |
| 2662 | */ |
| 2663 | if ((info->limit & MAP_PREFAULT_MADVISE) && |
| 2664 | vmstats.v_free_count < vmstats.v_free_reserved) { |
| 2665 | return(-1); |
| 2666 | } |
| 2667 | |
| 2668 | /* |
| 2669 | * Ignore list markers and ignore pages we cannot instantly |
| 2670 | * busy (while holding the object token). |
| 2671 | */ |
| 2672 | if (p->flags & PG_MARKER) |
| 2673 | return 0; |
| 2674 | if (vm_page_busy_try(p, TRUE)) |
| 2675 | return 0; |
| 2676 | if (((p->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) && |
| 2677 | (p->flags & PG_FICTITIOUS) == 0) { |
| 2678 | if ((p->queue - p->pc) == PQ_CACHE) |
| 2679 | vm_page_deactivate(p); |
| 2680 | rel_index = p->pindex - info->start_pindex; |
| 2681 | pmap_enter_quick(info->pmap, |
| 2682 | info->addr + i386_ptob(rel_index), p); |
| 2683 | } |
| 2684 | vm_page_wakeup(p); |
| 2685 | return(0); |
| 2686 | } |
| 2687 | |
| 2688 | /* |
| 2689 | * Return TRUE if the pmap is in shape to trivially |
| 2690 | * pre-fault the specified address. |
| 2691 | * |
| 2692 | * Returns FALSE if it would be non-trivial or if a |
| 2693 | * pte is already loaded into the slot. |
| 2694 | * |
| 2695 | * No requirements. |
| 2696 | */ |
| 2697 | int |
| 2698 | pmap_prefault_ok(pmap_t pmap, vm_offset_t addr) |
| 2699 | { |
| 2700 | unsigned *pte; |
| 2701 | int ret; |
| 2702 | |
| 2703 | lwkt_gettoken(&vm_token); |
| 2704 | if ((*pmap_pde(pmap, addr)) == 0) { |
| 2705 | ret = 0; |
| 2706 | } else { |
| 2707 | pte = (unsigned *) vtopte(addr); |
| 2708 | ret = (*pte) ? 0 : 1; |
| 2709 | } |
| 2710 | lwkt_reltoken(&vm_token); |
| 2711 | return(ret); |
| 2712 | } |
| 2713 | |
| 2714 | /* |
| 2715 | * Change the wiring attribute for a map/virtual-adderss pair. The mapping |
| 2716 | * must already exist. |
| 2717 | * |
| 2718 | * No requirements. |
| 2719 | */ |
| 2720 | void |
| 2721 | pmap_change_wiring(pmap_t pmap, vm_offset_t va, boolean_t wired) |
| 2722 | { |
| 2723 | unsigned *pte; |
| 2724 | |
| 2725 | if (pmap == NULL) |
| 2726 | return; |
| 2727 | |
| 2728 | lwkt_gettoken(&vm_token); |
| 2729 | pte = pmap_pte(pmap, va); |
| 2730 | |
| 2731 | if (wired && !pmap_pte_w(pte)) |
| 2732 | pmap->pm_stats.wired_count++; |
| 2733 | else if (!wired && pmap_pte_w(pte)) |
| 2734 | pmap->pm_stats.wired_count--; |
| 2735 | |
| 2736 | /* |
| 2737 | * Wiring is not a hardware characteristic so there is no need to |
| 2738 | * invalidate TLB. However, in an SMP environment we must use |
| 2739 | * a locked bus cycle to update the pte (if we are not using |
| 2740 | * the pmap_inval_*() API that is)... it's ok to do this for simple |
| 2741 | * wiring changes. |
| 2742 | */ |
| 2743 | #ifdef SMP |
| 2744 | if (wired) |
| 2745 | atomic_set_int(pte, PG_W); |
| 2746 | else |
| 2747 | atomic_clear_int(pte, PG_W); |
| 2748 | #else |
| 2749 | if (wired) |
| 2750 | atomic_set_int_nonlocked(pte, PG_W); |
| 2751 | else |
| 2752 | atomic_clear_int_nonlocked(pte, PG_W); |
| 2753 | #endif |
| 2754 | lwkt_reltoken(&vm_token); |
| 2755 | } |
| 2756 | |
| 2757 | /* |
| 2758 | * Copy the range specified by src_addr/len from the source map to the |
| 2759 | * range dst_addr/len in the destination map. |
| 2760 | * |
| 2761 | * This routine is only advisory and need not do anything. |
| 2762 | * |
| 2763 | * No requirements. |
| 2764 | */ |
| 2765 | void |
| 2766 | pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, |
| 2767 | vm_size_t len, vm_offset_t src_addr) |
| 2768 | { |
| 2769 | /* does nothing */ |
| 2770 | } |
| 2771 | |
| 2772 | /* |
| 2773 | * Zero the specified PA by mapping the page into KVM and clearing its |
| 2774 | * contents. |
| 2775 | * |
| 2776 | * No requirements. |
| 2777 | */ |
| 2778 | void |
| 2779 | pmap_zero_page(vm_paddr_t phys) |
| 2780 | { |
| 2781 | struct mdglobaldata *gd = mdcpu; |
| 2782 | |
| 2783 | crit_enter(); |
| 2784 | if (*(int *)gd->gd_CMAP3) |
| 2785 | panic("pmap_zero_page: CMAP3 busy"); |
| 2786 | *(int *)gd->gd_CMAP3 = |
| 2787 | PG_V | PG_RW | (phys & PG_FRAME) | PG_A | PG_M; |
| 2788 | cpu_invlpg(gd->gd_CADDR3); |
| 2789 | bzero(gd->gd_CADDR3, PAGE_SIZE); |
| 2790 | *(int *) gd->gd_CMAP3 = 0; |
| 2791 | crit_exit(); |
| 2792 | } |
| 2793 | |
| 2794 | /* |
| 2795 | * Assert that a page is empty, panic if it isn't. |
| 2796 | * |
| 2797 | * No requirements. |
| 2798 | */ |
| 2799 | void |
| 2800 | pmap_page_assertzero(vm_paddr_t phys) |
| 2801 | { |
| 2802 | struct mdglobaldata *gd = mdcpu; |
| 2803 | int i; |
| 2804 | |
| 2805 | crit_enter(); |
| 2806 | if (*(int *)gd->gd_CMAP3) |
| 2807 | panic("pmap_zero_page: CMAP3 busy"); |
| 2808 | *(int *)gd->gd_CMAP3 = |
| 2809 | PG_V | PG_RW | (phys & PG_FRAME) | PG_A | PG_M; |
| 2810 | cpu_invlpg(gd->gd_CADDR3); |
| 2811 | for (i = 0; i < PAGE_SIZE; i += 4) { |
| 2812 | if (*(int *)((char *)gd->gd_CADDR3 + i) != 0) { |
| 2813 | panic("pmap_page_assertzero() @ %p not zero!", |
| 2814 | (void *)gd->gd_CADDR3); |
| 2815 | } |
| 2816 | } |
| 2817 | *(int *) gd->gd_CMAP3 = 0; |
| 2818 | crit_exit(); |
| 2819 | } |
| 2820 | |
| 2821 | /* |
| 2822 | * Zero part of a physical page by mapping it into memory and clearing |
| 2823 | * its contents with bzero. |
| 2824 | * |
| 2825 | * off and size may not cover an area beyond a single hardware page. |
| 2826 | * |
| 2827 | * No requirements. |
| 2828 | */ |
| 2829 | void |
| 2830 | pmap_zero_page_area(vm_paddr_t phys, int off, int size) |
| 2831 | { |
| 2832 | struct mdglobaldata *gd = mdcpu; |
| 2833 | |
| 2834 | crit_enter(); |
| 2835 | if (*(int *) gd->gd_CMAP3) |
| 2836 | panic("pmap_zero_page: CMAP3 busy"); |
| 2837 | *(int *) gd->gd_CMAP3 = PG_V | PG_RW | (phys & PG_FRAME) | PG_A | PG_M; |
| 2838 | cpu_invlpg(gd->gd_CADDR3); |
| 2839 | bzero((char *)gd->gd_CADDR3 + off, size); |
| 2840 | *(int *) gd->gd_CMAP3 = 0; |
| 2841 | crit_exit(); |
| 2842 | } |
| 2843 | |
| 2844 | /* |
| 2845 | * Copy the physical page from the source PA to the target PA. |
| 2846 | * This function may be called from an interrupt. No locking |
| 2847 | * is required. |
| 2848 | * |
| 2849 | * No requirements. |
| 2850 | */ |
| 2851 | void |
| 2852 | pmap_copy_page(vm_paddr_t src, vm_paddr_t dst) |
| 2853 | { |
| 2854 | struct mdglobaldata *gd = mdcpu; |
| 2855 | |
| 2856 | crit_enter(); |
| 2857 | if (*(int *) gd->gd_CMAP1) |
| 2858 | panic("pmap_copy_page: CMAP1 busy"); |
| 2859 | if (*(int *) gd->gd_CMAP2) |
| 2860 | panic("pmap_copy_page: CMAP2 busy"); |
| 2861 | |
| 2862 | *(int *) gd->gd_CMAP1 = PG_V | (src & PG_FRAME) | PG_A; |
| 2863 | *(int *) gd->gd_CMAP2 = PG_V | PG_RW | (dst & PG_FRAME) | PG_A | PG_M; |
| 2864 | |
| 2865 | cpu_invlpg(gd->gd_CADDR1); |
| 2866 | cpu_invlpg(gd->gd_CADDR2); |
| 2867 | |
| 2868 | bcopy(gd->gd_CADDR1, gd->gd_CADDR2, PAGE_SIZE); |
| 2869 | |
| 2870 | *(int *) gd->gd_CMAP1 = 0; |
| 2871 | *(int *) gd->gd_CMAP2 = 0; |
| 2872 | crit_exit(); |
| 2873 | } |
| 2874 | |
| 2875 | /* |
| 2876 | * Copy the physical page from the source PA to the target PA. |
| 2877 | * This function may be called from an interrupt. No locking |
| 2878 | * is required. |
| 2879 | * |
| 2880 | * No requirements. |
| 2881 | */ |
| 2882 | void |
| 2883 | pmap_copy_page_frag(vm_paddr_t src, vm_paddr_t dst, size_t bytes) |
| 2884 | { |
| 2885 | struct mdglobaldata *gd = mdcpu; |
| 2886 | |
| 2887 | crit_enter(); |
| 2888 | if (*(int *) gd->gd_CMAP1) |
| 2889 | panic("pmap_copy_page: CMAP1 busy"); |
| 2890 | if (*(int *) gd->gd_CMAP2) |
| 2891 | panic("pmap_copy_page: CMAP2 busy"); |
| 2892 | |
| 2893 | *(int *) gd->gd_CMAP1 = PG_V | (src & PG_FRAME) | PG_A; |
| 2894 | *(int *) gd->gd_CMAP2 = PG_V | PG_RW | (dst & PG_FRAME) | PG_A | PG_M; |
| 2895 | |
| 2896 | cpu_invlpg(gd->gd_CADDR1); |
| 2897 | cpu_invlpg(gd->gd_CADDR2); |
| 2898 | |
| 2899 | bcopy((char *)gd->gd_CADDR1 + (src & PAGE_MASK), |
| 2900 | (char *)gd->gd_CADDR2 + (dst & PAGE_MASK), |
| 2901 | bytes); |
| 2902 | |
| 2903 | *(int *) gd->gd_CMAP1 = 0; |
| 2904 | *(int *) gd->gd_CMAP2 = 0; |
| 2905 | crit_exit(); |
| 2906 | } |
| 2907 | |
| 2908 | /* |
| 2909 | * Returns true if the pmap's pv is one of the first |
| 2910 | * 16 pvs linked to from this page. This count may |
| 2911 | * be changed upwards or downwards in the future; it |
| 2912 | * is only necessary that true be returned for a small |
| 2913 | * subset of pmaps for proper page aging. |
| 2914 | * |
| 2915 | * No requirements. |
| 2916 | */ |
| 2917 | boolean_t |
| 2918 | pmap_page_exists_quick(pmap_t pmap, vm_page_t m) |
| 2919 | { |
| 2920 | pv_entry_t pv; |
| 2921 | int loops = 0; |
| 2922 | |
| 2923 | if (!pmap_initialized || (m->flags & PG_FICTITIOUS)) |
| 2924 | return FALSE; |
| 2925 | |
| 2926 | lwkt_gettoken(&vm_token); |
| 2927 | TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { |
| 2928 | if (pv->pv_pmap == pmap) { |
| 2929 | lwkt_reltoken(&vm_token); |
| 2930 | return TRUE; |
| 2931 | } |
| 2932 | loops++; |
| 2933 | if (loops >= 16) |
| 2934 | break; |
| 2935 | } |
| 2936 | lwkt_reltoken(&vm_token); |
| 2937 | return (FALSE); |
| 2938 | } |
| 2939 | |
| 2940 | /* |
| 2941 | * Remove all pages from specified address space |
| 2942 | * this aids process exit speeds. Also, this code |
| 2943 | * is special cased for current process only, but |
| 2944 | * can have the more generic (and slightly slower) |
| 2945 | * mode enabled. This is much faster than pmap_remove |
| 2946 | * in the case of running down an entire address space. |
| 2947 | * |
| 2948 | * No requirements. |
| 2949 | */ |
| 2950 | void |
| 2951 | pmap_remove_pages(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) |
| 2952 | { |
| 2953 | struct lwp *lp; |
| 2954 | unsigned *pte, tpte; |
| 2955 | pv_entry_t pv, npv; |
| 2956 | vm_page_t m; |
| 2957 | pmap_inval_info info; |
| 2958 | int iscurrentpmap; |
| 2959 | int32_t save_generation; |
| 2960 | |
| 2961 | lp = curthread->td_lwp; |
| 2962 | if (lp && pmap == vmspace_pmap(lp->lwp_vmspace)) |
| 2963 | iscurrentpmap = 1; |
| 2964 | else |
| 2965 | iscurrentpmap = 0; |
| 2966 | |
| 2967 | if (pmap->pm_pteobj) |
| 2968 | vm_object_hold(pmap->pm_pteobj); |
| 2969 | lwkt_gettoken(&vm_token); |
| 2970 | pmap_inval_init(&info); |
| 2971 | |
| 2972 | for (pv = TAILQ_FIRST(&pmap->pm_pvlist); pv; pv = npv) { |
| 2973 | if (pv->pv_va >= eva || pv->pv_va < sva) { |
| 2974 | npv = TAILQ_NEXT(pv, pv_plist); |
| 2975 | continue; |
| 2976 | } |
| 2977 | |
| 2978 | KKASSERT(pmap == pv->pv_pmap); |
| 2979 | |
| 2980 | if (iscurrentpmap) |
| 2981 | pte = (unsigned *)vtopte(pv->pv_va); |
| 2982 | else |
| 2983 | pte = pmap_pte_quick(pmap, pv->pv_va); |
| 2984 | KKASSERT(*pte); |
| 2985 | pmap_inval_interlock(&info, pmap, pv->pv_va); |
| 2986 | |
| 2987 | /* |
| 2988 | * We cannot remove wired pages from a process' mapping |
| 2989 | * at this time |
| 2990 | */ |
| 2991 | if (*pte & PG_W) { |
| 2992 | pmap_inval_deinterlock(&info, pmap); |
| 2993 | npv = TAILQ_NEXT(pv, pv_plist); |
| 2994 | continue; |
| 2995 | } |
| 2996 | KKASSERT(*pte); |
| 2997 | tpte = loadandclear(pte); |
| 2998 | pmap_inval_deinterlock(&info, pmap); |
| 2999 | |
| 3000 | m = PHYS_TO_VM_PAGE(tpte); |
| 3001 | test_m_maps_pv(m, pv); |
| 3002 | |
| 3003 | KASSERT(m < &vm_page_array[vm_page_array_size], |
| 3004 | ("pmap_remove_pages: bad tpte %x", tpte)); |
| 3005 | |
| 3006 | KKASSERT(pmap->pm_stats.resident_count > 0); |
| 3007 | --pmap->pm_stats.resident_count; |
| 3008 | |
| 3009 | /* |
| 3010 | * Update the vm_page_t clean and reference bits. |
| 3011 | */ |
| 3012 | if (tpte & PG_M) { |
| 3013 | vm_page_dirty(m); |
| 3014 | } |
| 3015 | |
| 3016 | npv = TAILQ_NEXT(pv, pv_plist); |
| 3017 | #ifdef PMAP_DEBUG |
| 3018 | KKASSERT(pv->pv_m == m); |
| 3019 | KKASSERT(pv->pv_pmap == pmap); |
| 3020 | #endif |
| 3021 | TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist); |
| 3022 | save_generation = ++pmap->pm_generation; |
| 3023 | |
| 3024 | m->md.pv_list_count--; |
| 3025 | if (m->object) |
| 3026 | atomic_add_int(&m->object->agg_pv_list_count, -1); |
| 3027 | TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); |
| 3028 | if (TAILQ_EMPTY(&m->md.pv_list)) |
| 3029 | vm_page_flag_clear(m, PG_MAPPED | PG_WRITEABLE); |
| 3030 | |
| 3031 | pmap_unuse_pt(pmap, pv->pv_va, pv->pv_ptem, &info); |
| 3032 | free_pv_entry(pv); |
| 3033 | |
| 3034 | /* |
| 3035 | * Restart the scan if we blocked during the unuse or free |
| 3036 | * calls and other removals were made. |
| 3037 | */ |
| 3038 | if (save_generation != pmap->pm_generation) { |
| 3039 | kprintf("Warning: pmap_remove_pages race-A avoided\n"); |
| 3040 | npv = TAILQ_FIRST(&pmap->pm_pvlist); |
| 3041 | } |
| 3042 | } |
| 3043 | pmap_inval_done(&info); |
| 3044 | lwkt_reltoken(&vm_token); |
| 3045 | if (pmap->pm_pteobj) |
| 3046 | vm_object_drop(pmap->pm_pteobj); |
| 3047 | } |
| 3048 | |
| 3049 | /* |
| 3050 | * pmap_testbit tests bits in pte's |
| 3051 | * note that the testbit/clearbit routines are inline, |
| 3052 | * and a lot of things compile-time evaluate. |
| 3053 | * |
| 3054 | * The caller must hold vm_token. |
| 3055 | */ |
| 3056 | static boolean_t |
| 3057 | pmap_testbit(vm_page_t m, int bit) |
| 3058 | { |
| 3059 | pv_entry_t pv; |
| 3060 | unsigned *pte; |
| 3061 | |
| 3062 | if (!pmap_initialized || (m->flags & PG_FICTITIOUS)) |
| 3063 | return FALSE; |
| 3064 | |
| 3065 | if (TAILQ_FIRST(&m->md.pv_list) == NULL) |
| 3066 | return FALSE; |
| 3067 | |
| 3068 | TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { |
| 3069 | /* |
| 3070 | * if the bit being tested is the modified bit, then |
| 3071 | * mark clean_map and ptes as never |
| 3072 | * modified. |
| 3073 | */ |
| 3074 | if (bit & (PG_A|PG_M)) { |
| 3075 | if (!pmap_track_modified(pv->pv_va)) |
| 3076 | continue; |
| 3077 | } |
| 3078 | |
| 3079 | #if defined(PMAP_DIAGNOSTIC) |
| 3080 | if (!pv->pv_pmap) { |
| 3081 | kprintf("Null pmap (tb) at va: %p\n", |
| 3082 | (void *)pv->pv_va); |
| 3083 | continue; |
| 3084 | } |
| 3085 | #endif |
| 3086 | pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); |
| 3087 | if (*pte & bit) { |
| 3088 | return TRUE; |
| 3089 | } |
| 3090 | } |
| 3091 | return (FALSE); |
| 3092 | } |
| 3093 | |
| 3094 | /* |
| 3095 | * This routine is used to modify bits in ptes |
| 3096 | * |
| 3097 | * The caller must hold vm_token. |
| 3098 | */ |
| 3099 | static __inline void |
| 3100 | pmap_clearbit(vm_page_t m, int bit) |
| 3101 | { |
| 3102 | struct pmap_inval_info info; |
| 3103 | pv_entry_t pv; |
| 3104 | unsigned *pte; |
| 3105 | unsigned pbits; |
| 3106 | |
| 3107 | if (!pmap_initialized || (m->flags & PG_FICTITIOUS)) |
| 3108 | return; |
| 3109 | |
| 3110 | pmap_inval_init(&info); |
| 3111 | |
| 3112 | /* |
| 3113 | * Loop over all current mappings setting/clearing as appropos If |
| 3114 | * setting RO do we need to clear the VAC? |
| 3115 | */ |
| 3116 | TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { |
| 3117 | /* |
| 3118 | * don't write protect pager mappings |
| 3119 | */ |
| 3120 | if (bit == PG_RW) { |
| 3121 | if (!pmap_track_modified(pv->pv_va)) |
| 3122 | continue; |
| 3123 | } |
| 3124 | |
| 3125 | #if defined(PMAP_DIAGNOSTIC) |
| 3126 | if (!pv->pv_pmap) { |
| 3127 | kprintf("Null pmap (cb) at va: %p\n", |
| 3128 | (void *)pv->pv_va); |
| 3129 | continue; |
| 3130 | } |
| 3131 | #endif |
| 3132 | |
| 3133 | /* |
| 3134 | * Careful here. We can use a locked bus instruction to |
| 3135 | * clear PG_A or PG_M safely but we need to synchronize |
| 3136 | * with the target cpus when we mess with PG_RW. |
| 3137 | * |
| 3138 | * We do not have to force synchronization when clearing |
| 3139 | * PG_M even for PTEs generated via virtual memory maps, |
| 3140 | * because the virtual kernel will invalidate the pmap |
| 3141 | * entry when/if it needs to resynchronize the Modify bit. |
| 3142 | */ |
| 3143 | if (bit & PG_RW) |
| 3144 | pmap_inval_interlock(&info, pv->pv_pmap, pv->pv_va); |
| 3145 | pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); |
| 3146 | again: |
| 3147 | pbits = *pte; |
| 3148 | if (pbits & bit) { |
| 3149 | if (bit == PG_RW) { |
| 3150 | if (pbits & PG_M) { |
| 3151 | vm_page_dirty(m); |
| 3152 | atomic_clear_int(pte, PG_M|PG_RW); |
| 3153 | } else { |
| 3154 | /* |
| 3155 | * The cpu may be trying to set PG_M |
| 3156 | * simultaniously with our clearing |
| 3157 | * of PG_RW. |
| 3158 | */ |
| 3159 | if (!atomic_cmpset_int(pte, pbits, |
| 3160 | pbits & ~PG_RW)) |
| 3161 | goto again; |
| 3162 | } |
| 3163 | } else if (bit == PG_M) { |
| 3164 | /* |
| 3165 | * We could also clear PG_RW here to force |
| 3166 | * a fault on write to redetect PG_M for |
| 3167 | * virtual kernels, but it isn't necessary |
| 3168 | * since virtual kernels invalidate the pte |
| 3169 | * when they clear the VPTE_M bit in their |
| 3170 | * virtual page tables. |
| 3171 | */ |
| 3172 | atomic_clear_int(pte, PG_M); |
| 3173 | } else { |
| 3174 | atomic_clear_int(pte, bit); |
| 3175 | } |
| 3176 | } |
| 3177 | if (bit & PG_RW) |
| 3178 | pmap_inval_deinterlock(&info, pv->pv_pmap); |
| 3179 | } |
| 3180 | pmap_inval_done(&info); |
| 3181 | } |
| 3182 | |
| 3183 | /* |
| 3184 | * Lower the permission for all mappings to a given page. |
| 3185 | * |
| 3186 | * No requirements. |
| 3187 | */ |
| 3188 | void |
| 3189 | pmap_page_protect(vm_page_t m, vm_prot_t prot) |
| 3190 | { |
| 3191 | if ((prot & VM_PROT_WRITE) == 0) { |
| 3192 | lwkt_gettoken(&vm_token); |
| 3193 | if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { |
| 3194 | pmap_clearbit(m, PG_RW); |
| 3195 | vm_page_flag_clear(m, PG_WRITEABLE); |
| 3196 | } else { |
| 3197 | pmap_remove_all(m); |
| 3198 | } |
| 3199 | lwkt_reltoken(&vm_token); |
| 3200 | } |
| 3201 | } |
| 3202 | |
| 3203 | /* |
| 3204 | * Return the physical address given a physical page index. |
| 3205 | * |
| 3206 | * No requirements. |
| 3207 | */ |
| 3208 | vm_paddr_t |
| 3209 | pmap_phys_address(vm_pindex_t ppn) |
| 3210 | { |
| 3211 | return (i386_ptob(ppn)); |
| 3212 | } |
| 3213 | |
| 3214 | /* |
| 3215 | * Return a count of reference bits for a page, clearing those bits. |
| 3216 | * It is not necessary for every reference bit to be cleared, but it |
| 3217 | * is necessary that 0 only be returned when there are truly no |
| 3218 | * reference bits set. |
| 3219 | * |
| 3220 | * No requirements. |
| 3221 | */ |
| 3222 | int |
| 3223 | pmap_ts_referenced(vm_page_t m) |
| 3224 | { |
| 3225 | pv_entry_t pv, pvf, pvn; |
| 3226 | unsigned *pte; |
| 3227 | int rtval = 0; |
| 3228 | |
| 3229 | if (!pmap_initialized || (m->flags & PG_FICTITIOUS)) |
| 3230 | return (rtval); |
| 3231 | |
| 3232 | lwkt_gettoken(&vm_token); |
| 3233 | |
| 3234 | if ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) { |
| 3235 | |
| 3236 | pvf = pv; |
| 3237 | |
| 3238 | do { |
| 3239 | pvn = TAILQ_NEXT(pv, pv_list); |
| 3240 | |
| 3241 | TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); |
| 3242 | TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); |
| 3243 | |
| 3244 | if (!pmap_track_modified(pv->pv_va)) |
| 3245 | continue; |
| 3246 | |
| 3247 | pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); |
| 3248 | |
| 3249 | if (pte && (*pte & PG_A)) { |
| 3250 | #ifdef SMP |
| 3251 | atomic_clear_int(pte, PG_A); |
| 3252 | #else |
| 3253 | atomic_clear_int_nonlocked(pte, PG_A); |
| 3254 | #endif |
| 3255 | rtval++; |
| 3256 | if (rtval > 4) { |
| 3257 | break; |
| 3258 | } |
| 3259 | } |
| 3260 | } while ((pv = pvn) != NULL && pv != pvf); |
| 3261 | } |
| 3262 | |
| 3263 | lwkt_reltoken(&vm_token); |
| 3264 | |
| 3265 | return (rtval); |
| 3266 | } |
| 3267 | |
| 3268 | /* |
| 3269 | * Return whether or not the specified physical page was modified |
| 3270 | * in any physical maps. |
| 3271 | * |
| 3272 | * No requirements. |
| 3273 | */ |
| 3274 | boolean_t |
| 3275 | pmap_is_modified(vm_page_t m) |
| 3276 | { |
| 3277 | boolean_t res; |
| 3278 | |
| 3279 | lwkt_gettoken(&vm_token); |
| 3280 | res = pmap_testbit(m, PG_M); |
| 3281 | lwkt_reltoken(&vm_token); |
| 3282 | return (res); |
| 3283 | } |
| 3284 | |
| 3285 | /* |
| 3286 | * Clear the modify bits on the specified physical page. |
| 3287 | * |
| 3288 | * No requirements. |
| 3289 | */ |
| 3290 | void |
| 3291 | pmap_clear_modify(vm_page_t m) |
| 3292 | { |
| 3293 | lwkt_gettoken(&vm_token); |
| 3294 | pmap_clearbit(m, PG_M); |
| 3295 | lwkt_reltoken(&vm_token); |
| 3296 | } |
| 3297 | |
| 3298 | /* |
| 3299 | * Clear the reference bit on the specified physical page. |
| 3300 | * |
| 3301 | * No requirements. |
| 3302 | */ |
| 3303 | void |
| 3304 | pmap_clear_reference(vm_page_t m) |
| 3305 | { |
| 3306 | lwkt_gettoken(&vm_token); |
| 3307 | pmap_clearbit(m, PG_A); |
| 3308 | lwkt_reltoken(&vm_token); |
| 3309 | } |
| 3310 | |
| 3311 | /* |
| 3312 | * Miscellaneous support routines follow |
| 3313 | * |
| 3314 | * Called from the low level boot code only. |
| 3315 | */ |
| 3316 | static void |
| 3317 | i386_protection_init(void) |
| 3318 | { |
| 3319 | int *kp, prot; |
| 3320 | |
| 3321 | kp = protection_codes; |
| 3322 | for (prot = 0; prot < 8; prot++) { |
| 3323 | switch (prot) { |
| 3324 | case VM_PROT_NONE | VM_PROT_NONE | VM_PROT_NONE: |
| 3325 | /* |
| 3326 | * Read access is also 0. There isn't any execute bit, |
| 3327 | * so just make it readable. |
| 3328 | */ |
| 3329 | case VM_PROT_READ | VM_PROT_NONE | VM_PROT_NONE: |
| 3330 | case VM_PROT_READ | VM_PROT_NONE | VM_PROT_EXECUTE: |
| 3331 | case VM_PROT_NONE | VM_PROT_NONE | VM_PROT_EXECUTE: |
| 3332 | *kp++ = 0; |
| 3333 | break; |
| 3334 | case VM_PROT_NONE | VM_PROT_WRITE | VM_PROT_NONE: |
| 3335 | case VM_PROT_NONE | VM_PROT_WRITE | VM_PROT_EXECUTE: |
| 3336 | case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_NONE: |
| 3337 | case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE: |
| 3338 | *kp++ = PG_RW; |
| 3339 | break; |
| 3340 | } |
| 3341 | } |
| 3342 | } |
| 3343 | |
| 3344 | /* |
| 3345 | * Map a set of physical memory pages into the kernel virtual |
| 3346 | * address space. Return a pointer to where it is mapped. This |
| 3347 | * routine is intended to be used for mapping device memory, |
| 3348 | * NOT real memory. |
| 3349 | * |
| 3350 | * NOTE: we can't use pgeflag unless we invalidate the pages one at |
| 3351 | * a time. |
| 3352 | * |
| 3353 | * No requirements. |
| 3354 | */ |
| 3355 | void * |
| 3356 | pmap_mapdev(vm_paddr_t pa, vm_size_t size) |
| 3357 | { |
| 3358 | vm_offset_t va, tmpva, offset; |
| 3359 | unsigned *pte; |
| 3360 | |
| 3361 | offset = pa & PAGE_MASK; |
| 3362 | size = roundup(offset + size, PAGE_SIZE); |
| 3363 | |
| 3364 | va = kmem_alloc_nofault(&kernel_map, size, PAGE_SIZE); |
| 3365 | if (!va) |
| 3366 | panic("pmap_mapdev: Couldn't alloc kernel virtual memory"); |
| 3367 | |
| 3368 | pa = pa & PG_FRAME; |
| 3369 | for (tmpva = va; size > 0;) { |
| 3370 | pte = (unsigned *)vtopte(tmpva); |
| 3371 | *pte = pa | PG_RW | PG_V; /* | pgeflag; */ |
| 3372 | size -= PAGE_SIZE; |
| 3373 | tmpva += PAGE_SIZE; |
| 3374 | pa += PAGE_SIZE; |
| 3375 | } |
| 3376 | smp_invltlb(); |
| 3377 | cpu_invltlb(); |
| 3378 | |
| 3379 | return ((void *)(va + offset)); |
| 3380 | } |
| 3381 | |
| 3382 | void * |
| 3383 | pmap_mapdev_uncacheable(vm_paddr_t pa, vm_size_t size) |
| 3384 | { |
| 3385 | vm_offset_t va, tmpva, offset; |
| 3386 | unsigned *pte; |
| 3387 | |
| 3388 | offset = pa & PAGE_MASK; |
| 3389 | size = roundup(offset + size, PAGE_SIZE); |
| 3390 | |
| 3391 | va = kmem_alloc_nofault(&kernel_map, size, PAGE_SIZE); |
| 3392 | if (va == 0) { |
| 3393 | panic("pmap_mapdev_uncacheable: " |
| 3394 | "Couldn't alloc kernel virtual memory"); |
| 3395 | } |
| 3396 | |
| 3397 | pa = pa & PG_FRAME; |
| 3398 | for (tmpva = va; size > 0;) { |
| 3399 | pte = (unsigned *)vtopte(tmpva); |
| 3400 | *pte = pa | PG_RW | PG_V | PG_N; /* | pgeflag; */ |
| 3401 | size -= PAGE_SIZE; |
| 3402 | tmpva += PAGE_SIZE; |
| 3403 | pa += PAGE_SIZE; |
| 3404 | } |
| 3405 | smp_invltlb(); |
| 3406 | cpu_invltlb(); |
| 3407 | |
| 3408 | return ((void *)(va + offset)); |
| 3409 | } |
| 3410 | |
| 3411 | /* |
| 3412 | * No requirements. |
| 3413 | */ |
| 3414 | void |
| 3415 | pmap_unmapdev(vm_offset_t va, vm_size_t size) |
| 3416 | { |
| 3417 | vm_offset_t base, offset; |
| 3418 | |
| 3419 | base = va & PG_FRAME; |
| 3420 | offset = va & PAGE_MASK; |
| 3421 | size = roundup(offset + size, PAGE_SIZE); |
| 3422 | pmap_qremove(va, size >> PAGE_SHIFT); |
| 3423 | kmem_free(&kernel_map, base, size); |
| 3424 | } |
| 3425 | |
| 3426 | /* |
| 3427 | * Perform the pmap work for mincore |
| 3428 | * |
| 3429 | * The caller must hold vm_token if the caller wishes a stable result, |
| 3430 | * and even in that case some bits can change due to third party accesses |
| 3431 | * to the pmap. |
| 3432 | * |
| 3433 | * No requirements. |
| 3434 | */ |
| 3435 | int |
| 3436 | pmap_mincore(pmap_t pmap, vm_offset_t addr) |
| 3437 | { |
| 3438 | unsigned *ptep, pte; |
| 3439 | vm_page_t m; |
| 3440 | int val = 0; |
| 3441 | |
| 3442 | lwkt_gettoken(&vm_token); |
| 3443 | ptep = pmap_pte(pmap, addr); |
| 3444 | |
| 3445 | if (ptep && (pte = *ptep) != 0) { |
| 3446 | vm_offset_t pa; |
| 3447 | |
| 3448 | val = MINCORE_INCORE; |
| 3449 | if ((pte & PG_MANAGED) == 0) |
| 3450 | goto done; |
| 3451 | |
| 3452 | pa = pte & PG_FRAME; |
| 3453 | |
| 3454 | m = PHYS_TO_VM_PAGE(pa); |
| 3455 | |
| 3456 | if (pte & PG_M) { |
| 3457 | /* |
| 3458 | * Modified by us |
| 3459 | */ |
| 3460 | val |= MINCORE_MODIFIED|MINCORE_MODIFIED_OTHER; |
| 3461 | } else if (m->dirty || pmap_is_modified(m)) { |
| 3462 | /* |
| 3463 | * Modified by someone else |
| 3464 | */ |
| 3465 | val |= MINCORE_MODIFIED_OTHER; |
| 3466 | } |
| 3467 | |
| 3468 | if (pte & PG_A) { |
| 3469 | /* |
| 3470 | * Referenced by us |
| 3471 | */ |
| 3472 | val |= MINCORE_REFERENCED|MINCORE_REFERENCED_OTHER; |
| 3473 | } else if ((m->flags & PG_REFERENCED) || |
| 3474 | pmap_ts_referenced(m)) { |
| 3475 | /* |
| 3476 | * Referenced by someone else |
| 3477 | */ |
| 3478 | val |= MINCORE_REFERENCED_OTHER; |
| 3479 | vm_page_flag_set(m, PG_REFERENCED); |
| 3480 | } |
| 3481 | } |
| 3482 | done: |
| 3483 | lwkt_reltoken(&vm_token); |
| 3484 | return val; |
| 3485 | } |
| 3486 | |
| 3487 | /* |
| 3488 | * Replace p->p_vmspace with a new one. If adjrefs is non-zero the new |
| 3489 | * vmspace will be ref'd and the old one will be deref'd. |
| 3490 | * |
| 3491 | * cr3 will be reloaded if any lwp is the current lwp. |
| 3492 | * |
| 3493 | * Only called with new VM spaces. |
| 3494 | * The process must have only a single thread. |
| 3495 | * The process must hold the vmspace->vm_map.token for oldvm and newvm |
| 3496 | * No other requirements. |
| 3497 | */ |
| 3498 | void |
| 3499 | pmap_replacevm(struct proc *p, struct vmspace *newvm, int adjrefs) |
| 3500 | { |
| 3501 | struct vmspace *oldvm; |
| 3502 | struct lwp *lp; |
| 3503 | |
| 3504 | oldvm = p->p_vmspace; |
| 3505 | if (oldvm != newvm) { |
| 3506 | if (adjrefs) |
| 3507 | sysref_get(&newvm->vm_sysref); |
| 3508 | p->p_vmspace = newvm; |
| 3509 | KKASSERT(p->p_nthreads == 1); |
| 3510 | lp = RB_ROOT(&p->p_lwp_tree); |
| 3511 | pmap_setlwpvm(lp, newvm); |
| 3512 | if (adjrefs) |
| 3513 | sysref_put(&oldvm->vm_sysref); |
| 3514 | } |
| 3515 | } |
| 3516 | |
| 3517 | /* |
| 3518 | * Set the vmspace for a LWP. The vmspace is almost universally set the |
| 3519 | * same as the process vmspace, but virtual kernels need to swap out contexts |
| 3520 | * on a per-lwp basis. |
| 3521 | * |
| 3522 | * Always called with a lp under the caller's direct control, either |
| 3523 | * unscheduled or the current lwp. |
| 3524 | * |
| 3525 | * No requirements. |
| 3526 | */ |
| 3527 | void |
| 3528 | pmap_setlwpvm(struct lwp *lp, struct vmspace *newvm) |
| 3529 | { |
| 3530 | struct vmspace *oldvm; |
| 3531 | struct pmap *pmap; |
| 3532 | |
| 3533 | oldvm = lp->lwp_vmspace; |
| 3534 | |
| 3535 | if (oldvm != newvm) { |
| 3536 | lp->lwp_vmspace = newvm; |
| 3537 | if (curthread->td_lwp == lp) { |
| 3538 | pmap = vmspace_pmap(newvm); |
| 3539 | #if defined(SMP) |
| 3540 | atomic_set_cpumask(&pmap->pm_active, mycpu->gd_cpumask); |
| 3541 | if (pmap->pm_active & CPUMASK_LOCK) |
| 3542 | pmap_interlock_wait(newvm); |
| 3543 | #else |
| 3544 | pmap->pm_active |= 1; |
| 3545 | #endif |
| 3546 | #if defined(SWTCH_OPTIM_STATS) |
| 3547 | tlb_flush_count++; |
| 3548 | #endif |
| 3549 | curthread->td_pcb->pcb_cr3 = vtophys(pmap->pm_pdir); |
| 3550 | load_cr3(curthread->td_pcb->pcb_cr3); |
| 3551 | pmap = vmspace_pmap(oldvm); |
| 3552 | #if defined(SMP) |
| 3553 | atomic_clear_cpumask(&pmap->pm_active, |
| 3554 | mycpu->gd_cpumask); |
| 3555 | #else |
| 3556 | pmap->pm_active &= ~(cpumask_t)1; |
| 3557 | #endif |
| 3558 | } |
| 3559 | } |
| 3560 | } |
| 3561 | |
| 3562 | #ifdef SMP |
| 3563 | /* |
| 3564 | * Called when switching to a locked pmap, used to interlock against pmaps |
| 3565 | * undergoing modifications to prevent us from activating the MMU for the |
| 3566 | * target pmap until all such modifications have completed. We have to do |
| 3567 | * this because the thread making the modifications has already set up its |
| 3568 | * SMP synchronization mask. |
| 3569 | * |
| 3570 | * No requirements. |
| 3571 | */ |
| 3572 | void |
| 3573 | pmap_interlock_wait(struct vmspace *vm) |
| 3574 | { |
| 3575 | struct pmap *pmap = &vm->vm_pmap; |
| 3576 | |
| 3577 | if (pmap->pm_active & CPUMASK_LOCK) { |
| 3578 | crit_enter(); |
| 3579 | DEBUG_PUSH_INFO("pmap_interlock_wait"); |
| 3580 | while (pmap->pm_active & CPUMASK_LOCK) { |
| 3581 | cpu_ccfence(); |
| 3582 | lwkt_process_ipiq(); |
| 3583 | } |
| 3584 | DEBUG_POP_INFO(); |
| 3585 | crit_exit(); |
| 3586 | } |
| 3587 | } |
| 3588 | |
| 3589 | #endif |
| 3590 | |
| 3591 | /* |
| 3592 | * Return a page-directory alignment hint for device mappings which will |
| 3593 | * allow the use of super-pages for the mapping. |
| 3594 | * |
| 3595 | * No requirements. |
| 3596 | */ |
| 3597 | vm_offset_t |
| 3598 | pmap_addr_hint(vm_object_t obj, vm_offset_t addr, vm_size_t size) |
| 3599 | { |
| 3600 | |
| 3601 | if ((obj == NULL) || (size < NBPDR) || (obj->type != OBJT_DEVICE)) { |
| 3602 | return addr; |
| 3603 | } |
| 3604 | |
| 3605 | addr = (addr + (NBPDR - 1)) & ~(NBPDR - 1); |
| 3606 | return addr; |
| 3607 | } |
| 3608 | |
| 3609 | /* |
| 3610 | * Return whether the PGE flag is supported globally. |
| 3611 | * |
| 3612 | * No requirements. |
| 3613 | */ |
| 3614 | int |
| 3615 | pmap_get_pgeflag(void) |
| 3616 | { |
| 3617 | return pgeflag; |
| 3618 | } |
| 3619 | |
| 3620 | /* |
| 3621 | * Used by kmalloc/kfree, page already exists at va |
| 3622 | */ |
| 3623 | vm_page_t |
| 3624 | pmap_kvtom(vm_offset_t va) |
| 3625 | { |
| 3626 | return(PHYS_TO_VM_PAGE(*vtopte(va) & PG_FRAME)); |
| 3627 | } |