uvm_km.c revision 1.66
1/* $NetBSD: uvm_km.c,v 1.66 2003/12/18 15:02:04 pk Exp $ */ 2 3/* 4 * Copyright (c) 1997 Charles D. Cranor and Washington University. 5 * Copyright (c) 1991, 1993, The Regents of the University of California. 6 * 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * The Mach Operating System project at Carnegie-Mellon University. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by Charles D. Cranor, 23 * Washington University, the University of California, Berkeley and 24 * its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * @(#)vm_kern.c 8.3 (Berkeley) 1/12/94 42 * from: Id: uvm_km.c,v 1.1.2.14 1998/02/06 05:19:27 chs Exp 43 * 44 * 45 * Copyright (c) 1987, 1990 Carnegie-Mellon University. 46 * All rights reserved. 47 * 48 * Permission to use, copy, modify and distribute this software and 49 * its documentation is hereby granted, provided that both the copyright 50 * notice and this permission notice appear in all copies of the 51 * software, derivative works or modified versions, and any portions 52 * thereof, and that both notices appear in supporting documentation. 53 * 54 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 55 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 56 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 57 * 58 * Carnegie Mellon requests users of this software to return to 59 * 60 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 61 * School of Computer Science 62 * Carnegie Mellon University 63 * Pittsburgh PA 15213-3890 64 * 65 * any improvements or extensions that they make and grant Carnegie the 66 * rights to redistribute these changes. 67 */ 68 69/* 70 * uvm_km.c: handle kernel memory allocation and management 71 */ 72 73/* 74 * overview of kernel memory management: 75 * 76 * the kernel virtual address space is mapped by "kernel_map." kernel_map 77 * starts at VM_MIN_KERNEL_ADDRESS and goes to VM_MAX_KERNEL_ADDRESS. 78 * note that VM_MIN_KERNEL_ADDRESS is equal to vm_map_min(kernel_map). 79 * 80 * the kernel_map has several "submaps." submaps can only appear in 81 * the kernel_map (user processes can't use them). submaps "take over" 82 * the management of a sub-range of the kernel's address space. submaps 83 * are typically allocated at boot time and are never released. kernel 84 * virtual address space that is mapped by a submap is locked by the 85 * submap's lock -- not the kernel_map's lock. 86 * 87 * thus, the useful feature of submaps is that they allow us to break 88 * up the locking and protection of the kernel address space into smaller 89 * chunks. 90 * 91 * the vm system has several standard kernel submaps, including: 92 * kmem_map => contains only wired kernel memory for the kernel 93 * malloc. *** access to kmem_map must be protected 94 * by splvm() because we are allowed to call malloc() 95 * at interrupt time *** 96 * mb_map => memory for large mbufs, *** protected by splvm *** 97 * pager_map => used to map "buf" structures into kernel space 98 * exec_map => used during exec to handle exec args 99 * etc... 100 * 101 * the kernel allocates its private memory out of special uvm_objects whose 102 * reference count is set to UVM_OBJ_KERN (thus indicating that the objects 103 * are "special" and never die). all kernel objects should be thought of 104 * as large, fixed-sized, sparsely populated uvm_objects. each kernel 105 * object is equal to the size of kernel virtual address space (i.e. the 106 * value "VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS"). 107 * 108 * most kernel private memory lives in kernel_object. the only exception 109 * to this is for memory that belongs to submaps that must be protected 110 * by splvm(). pages in these submaps are not assigned to an object. 111 * 112 * note that just because a kernel object spans the entire kernel virutal 113 * address space doesn't mean that it has to be mapped into the entire space. 114 * large chunks of a kernel object's space go unused either because 115 * that area of kernel VM is unmapped, or there is some other type of 116 * object mapped into that range (e.g. a vnode). for submap's kernel 117 * objects, the only part of the object that can ever be populated is the 118 * offsets that are managed by the submap. 119 * 120 * note that the "offset" in a kernel object is always the kernel virtual 121 * address minus the VM_MIN_KERNEL_ADDRESS (aka vm_map_min(kernel_map)). 122 * example: 123 * suppose VM_MIN_KERNEL_ADDRESS is 0xf8000000 and the kernel does a 124 * uvm_km_alloc(kernel_map, PAGE_SIZE) [allocate 1 wired down page in the 125 * kernel map]. if uvm_km_alloc returns virtual address 0xf8235000, 126 * then that means that the page at offset 0x235000 in kernel_object is 127 * mapped at 0xf8235000. 128 * 129 * kernel object have one other special property: when the kernel virtual 130 * memory mapping them is unmapped, the backing memory in the object is 131 * freed right away. this is done with the uvm_km_pgremove() function. 132 * this has to be done because there is no backing store for kernel pages 133 * and no need to save them after they are no longer referenced. 134 */ 135 136#include <sys/cdefs.h> 137__KERNEL_RCSID(0, "$NetBSD: uvm_km.c,v 1.66 2003/12/18 15:02:04 pk Exp $"); 138 139#include "opt_uvmhist.h" 140 141#include <sys/param.h> 142#include <sys/systm.h> 143#include <sys/proc.h> 144 145#include <uvm/uvm.h> 146 147/* 148 * global data structures 149 */ 150 151struct vm_map *kernel_map = NULL; 152 153/* 154 * local data structues 155 */ 156 157static struct vm_map kernel_map_store; 158 159/* 160 * uvm_km_init: init kernel maps and objects to reflect reality (i.e. 161 * KVM already allocated for text, data, bss, and static data structures). 162 * 163 * => KVM is defined by VM_MIN_KERNEL_ADDRESS/VM_MAX_KERNEL_ADDRESS. 164 * we assume that [min -> start] has already been allocated and that 165 * "end" is the end. 166 */ 167 168void 169uvm_km_init(start, end) 170 vaddr_t start, end; 171{ 172 vaddr_t base = VM_MIN_KERNEL_ADDRESS; 173 174 /* 175 * next, init kernel memory objects. 176 */ 177 178 /* kernel_object: for pageable anonymous kernel memory */ 179 uao_init(); 180 uvm.kernel_object = uao_create(VM_MAX_KERNEL_ADDRESS - 181 VM_MIN_KERNEL_ADDRESS, UAO_FLAG_KERNOBJ); 182 183 /* 184 * init the map and reserve any space that might already 185 * have been allocated kernel space before installing. 186 */ 187 188 uvm_map_setup(&kernel_map_store, base, end, VM_MAP_PAGEABLE); 189 kernel_map_store.pmap = pmap_kernel(); 190 if (start != base && 191 uvm_map(&kernel_map_store, &base, start - base, NULL, 192 UVM_UNKNOWN_OFFSET, 0, 193 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_NONE, 194 UVM_ADV_RANDOM, UVM_FLAG_FIXED)) != 0) 195 panic("uvm_km_init: could not reserve space for kernel"); 196 197 /* 198 * install! 199 */ 200 201 kernel_map = &kernel_map_store; 202} 203 204/* 205 * uvm_km_suballoc: allocate a submap in the kernel map. once a submap 206 * is allocated all references to that area of VM must go through it. this 207 * allows the locking of VAs in kernel_map to be broken up into regions. 208 * 209 * => if `fixed' is true, *min specifies where the region described 210 * by the submap must start 211 * => if submap is non NULL we use that as the submap, otherwise we 212 * alloc a new map 213 */ 214struct vm_map * 215uvm_km_suballoc(map, min, max, size, flags, fixed, submap) 216 struct vm_map *map; 217 vaddr_t *min, *max; /* IN/OUT, OUT */ 218 vsize_t size; 219 int flags; 220 boolean_t fixed; 221 struct vm_map *submap; 222{ 223 int mapflags = UVM_FLAG_NOMERGE | (fixed ? UVM_FLAG_FIXED : 0); 224 225 size = round_page(size); /* round up to pagesize */ 226 227 /* 228 * first allocate a blank spot in the parent map 229 */ 230 231 if (uvm_map(map, min, size, NULL, UVM_UNKNOWN_OFFSET, 0, 232 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_NONE, 233 UVM_ADV_RANDOM, mapflags)) != 0) { 234 panic("uvm_km_suballoc: unable to allocate space in parent map"); 235 } 236 237 /* 238 * set VM bounds (min is filled in by uvm_map) 239 */ 240 241 *max = *min + size; 242 243 /* 244 * add references to pmap and create or init the submap 245 */ 246 247 pmap_reference(vm_map_pmap(map)); 248 if (submap == NULL) { 249 submap = uvm_map_create(vm_map_pmap(map), *min, *max, flags); 250 if (submap == NULL) 251 panic("uvm_km_suballoc: unable to create submap"); 252 } else { 253 uvm_map_setup(submap, *min, *max, flags); 254 submap->pmap = vm_map_pmap(map); 255 } 256 257 /* 258 * now let uvm_map_submap plug in it... 259 */ 260 261 if (uvm_map_submap(map, *min, *max, submap) != 0) 262 panic("uvm_km_suballoc: submap allocation failed"); 263 264 return(submap); 265} 266 267/* 268 * uvm_km_pgremove: remove pages from a kernel uvm_object. 269 * 270 * => when you unmap a part of anonymous kernel memory you want to toss 271 * the pages right away. (this gets called from uvm_unmap_...). 272 */ 273 274void 275uvm_km_pgremove(uobj, start, end) 276 struct uvm_object *uobj; 277 vaddr_t start, end; 278{ 279 struct vm_page *pg; 280 voff_t curoff, nextoff; 281 int swpgonlydelta = 0; 282 UVMHIST_FUNC("uvm_km_pgremove"); UVMHIST_CALLED(maphist); 283 284 KASSERT(uobj->pgops == &aobj_pager); 285 simple_lock(&uobj->vmobjlock); 286 287 for (curoff = start; curoff < end; curoff = nextoff) { 288 nextoff = curoff + PAGE_SIZE; 289 pg = uvm_pagelookup(uobj, curoff); 290 if (pg != NULL && pg->flags & PG_BUSY) { 291 pg->flags |= PG_WANTED; 292 UVM_UNLOCK_AND_WAIT(pg, &uobj->vmobjlock, 0, 293 "km_pgrm", 0); 294 simple_lock(&uobj->vmobjlock); 295 nextoff = curoff; 296 continue; 297 } 298 299 /* 300 * free the swap slot, then the page. 301 */ 302 303 if (pg == NULL && 304 uao_find_swslot(uobj, curoff >> PAGE_SHIFT) > 0) { 305 swpgonlydelta++; 306 } 307 uao_dropswap(uobj, curoff >> PAGE_SHIFT); 308 if (pg != NULL) { 309 uvm_lock_pageq(); 310 uvm_pagefree(pg); 311 uvm_unlock_pageq(); 312 } 313 } 314 simple_unlock(&uobj->vmobjlock); 315 316 if (swpgonlydelta > 0) { 317 simple_lock(&uvm.swap_data_lock); 318 KASSERT(uvmexp.swpgonly >= swpgonlydelta); 319 uvmexp.swpgonly -= swpgonlydelta; 320 simple_unlock(&uvm.swap_data_lock); 321 } 322} 323 324 325/* 326 * uvm_km_pgremove_intrsafe: like uvm_km_pgremove(), but for "intrsafe" 327 * maps 328 * 329 * => when you unmap a part of anonymous kernel memory you want to toss 330 * the pages right away. (this is called from uvm_unmap_...). 331 * => none of the pages will ever be busy, and none of them will ever 332 * be on the active or inactive queues (because they have no object). 333 */ 334 335void 336uvm_km_pgremove_intrsafe(start, end) 337 vaddr_t start, end; 338{ 339 struct vm_page *pg; 340 paddr_t pa; 341 UVMHIST_FUNC("uvm_km_pgremove_intrsafe"); UVMHIST_CALLED(maphist); 342 343 for (; start < end; start += PAGE_SIZE) { 344 if (!pmap_extract(pmap_kernel(), start, &pa)) { 345 continue; 346 } 347 pg = PHYS_TO_VM_PAGE(pa); 348 KASSERT(pg); 349 KASSERT(pg->uobject == NULL && pg->uanon == NULL); 350 uvm_pagefree(pg); 351 } 352} 353 354 355/* 356 * uvm_km_kmemalloc: lower level kernel memory allocator for malloc() 357 * 358 * => we map wired memory into the specified map using the obj passed in 359 * => NOTE: we can return NULL even if we can wait if there is not enough 360 * free VM space in the map... caller should be prepared to handle 361 * this case. 362 * => we return KVA of memory allocated 363 * => align,prefer - passed on to uvm_map() 364 * => flags: NOWAIT, VALLOC - just allocate VA, TRYLOCK - fail if we can't 365 * lock the map 366 */ 367 368vaddr_t 369uvm_km_kmemalloc1(map, obj, size, align, prefer, flags) 370 struct vm_map *map; 371 struct uvm_object *obj; 372 vsize_t size; 373 vsize_t align; 374 voff_t prefer; 375 int flags; 376{ 377 vaddr_t kva, loopva; 378 vaddr_t offset; 379 vsize_t loopsize; 380 struct vm_page *pg; 381 UVMHIST_FUNC("uvm_km_kmemalloc"); UVMHIST_CALLED(maphist); 382 383 UVMHIST_LOG(maphist," (map=0x%x, obj=0x%x, size=0x%x, flags=%d)", 384 map, obj, size, flags); 385 KASSERT(vm_map_pmap(map) == pmap_kernel()); 386 387 /* 388 * setup for call 389 */ 390 391 size = round_page(size); 392 kva = vm_map_min(map); /* hint */ 393 394 /* 395 * allocate some virtual space 396 */ 397 398 if (__predict_false(uvm_map(map, &kva, size, obj, prefer, align, 399 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_NONE, 400 UVM_ADV_RANDOM, 401 (flags & (UVM_KMF_TRYLOCK | UVM_KMF_NOWAIT)))) 402 != 0)) { 403 UVMHIST_LOG(maphist, "<- done (no VM)",0,0,0,0); 404 return(0); 405 } 406 407 /* 408 * if all we wanted was VA, return now 409 */ 410 411 if (flags & UVM_KMF_VALLOC) { 412 UVMHIST_LOG(maphist,"<- done valloc (kva=0x%x)", kva,0,0,0); 413 return(kva); 414 } 415 416 /* 417 * recover object offset from virtual address 418 */ 419 420 offset = kva - vm_map_min(kernel_map); 421 UVMHIST_LOG(maphist, " kva=0x%x, offset=0x%x", kva, offset,0,0); 422 423 /* 424 * now allocate and map in the memory... note that we are the only ones 425 * whom should ever get a handle on this area of VM. 426 */ 427 428 loopva = kva; 429 loopsize = size; 430 while (loopsize) { 431 if (obj) { 432 simple_lock(&obj->vmobjlock); 433 } 434 pg = uvm_pagealloc(obj, offset, NULL, UVM_PGA_USERESERVE); 435 if (__predict_true(pg != NULL)) { 436 pg->flags &= ~PG_BUSY; /* new page */ 437 UVM_PAGE_OWN(pg, NULL); 438 } 439 if (obj) { 440 simple_unlock(&obj->vmobjlock); 441 } 442 443 /* 444 * out of memory? 445 */ 446 447 if (__predict_false(pg == NULL)) { 448 if ((flags & UVM_KMF_NOWAIT) || 449 ((flags & UVM_KMF_CANFAIL) && uvm_swapisfull())) { 450 /* free everything! */ 451 uvm_unmap(map, kva, kva + size); 452 return (0); 453 } else { 454 uvm_wait("km_getwait2"); /* sleep here */ 455 continue; 456 } 457 } 458 459 /* 460 * map it in 461 */ 462 463 if (obj == NULL) { 464 pmap_kenter_pa(loopva, VM_PAGE_TO_PHYS(pg), 465 VM_PROT_READ | VM_PROT_WRITE); 466 } else { 467 pmap_enter(map->pmap, loopva, VM_PAGE_TO_PHYS(pg), 468 UVM_PROT_ALL, 469 PMAP_WIRED | VM_PROT_READ | VM_PROT_WRITE); 470 } 471 loopva += PAGE_SIZE; 472 offset += PAGE_SIZE; 473 loopsize -= PAGE_SIZE; 474 } 475 476 pmap_update(pmap_kernel()); 477 478 UVMHIST_LOG(maphist,"<- done (kva=0x%x)", kva,0,0,0); 479 return(kva); 480} 481 482/* 483 * uvm_km_free: free an area of kernel memory 484 */ 485 486void 487uvm_km_free(map, addr, size) 488 struct vm_map *map; 489 vaddr_t addr; 490 vsize_t size; 491{ 492 uvm_unmap(map, trunc_page(addr), round_page(addr+size)); 493} 494 495/* 496 * uvm_km_free_wakeup: free an area of kernel memory and wake up 497 * anyone waiting for vm space. 498 * 499 * => XXX: "wanted" bit + unlock&wait on other end? 500 */ 501 502void 503uvm_km_free_wakeup(map, addr, size) 504 struct vm_map *map; 505 vaddr_t addr; 506 vsize_t size; 507{ 508 struct vm_map_entry *dead_entries; 509 510 vm_map_lock(map); 511 uvm_unmap_remove(map, trunc_page(addr), round_page(addr + size), 512 &dead_entries); 513 wakeup(map); 514 vm_map_unlock(map); 515 if (dead_entries != NULL) 516 uvm_unmap_detach(dead_entries, 0); 517} 518 519/* 520 * uvm_km_alloc1: allocate wired down memory in the kernel map. 521 * 522 * => we can sleep if needed 523 */ 524 525vaddr_t 526uvm_km_alloc1(map, size, zeroit) 527 struct vm_map *map; 528 vsize_t size; 529 boolean_t zeroit; 530{ 531 vaddr_t kva, loopva, offset; 532 struct vm_page *pg; 533 UVMHIST_FUNC("uvm_km_alloc1"); UVMHIST_CALLED(maphist); 534 535 UVMHIST_LOG(maphist,"(map=0x%x, size=0x%x)", map, size,0,0); 536 KASSERT(vm_map_pmap(map) == pmap_kernel()); 537 538 size = round_page(size); 539 kva = vm_map_min(map); /* hint */ 540 541 /* 542 * allocate some virtual space 543 */ 544 545 if (__predict_false(uvm_map(map, &kva, size, uvm.kernel_object, 546 UVM_UNKNOWN_OFFSET, 0, UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, 547 UVM_INH_NONE, UVM_ADV_RANDOM, 548 0)) != 0)) { 549 UVMHIST_LOG(maphist,"<- done (no VM)",0,0,0,0); 550 return(0); 551 } 552 553 /* 554 * recover object offset from virtual address 555 */ 556 557 offset = kva - vm_map_min(kernel_map); 558 UVMHIST_LOG(maphist," kva=0x%x, offset=0x%x", kva, offset,0,0); 559 560 /* 561 * now allocate the memory. 562 */ 563 564 loopva = kva; 565 while (size) { 566 simple_lock(&uvm.kernel_object->vmobjlock); 567 KASSERT(uvm_pagelookup(uvm.kernel_object, offset) == NULL); 568 pg = uvm_pagealloc(uvm.kernel_object, offset, NULL, 0); 569 if (pg) { 570 pg->flags &= ~PG_BUSY; 571 UVM_PAGE_OWN(pg, NULL); 572 } 573 simple_unlock(&uvm.kernel_object->vmobjlock); 574 if (pg == NULL) { 575 uvm_wait("km_alloc1w"); 576 continue; 577 } 578 pmap_enter(map->pmap, loopva, VM_PAGE_TO_PHYS(pg), 579 UVM_PROT_ALL, PMAP_WIRED | VM_PROT_READ | VM_PROT_WRITE); 580 loopva += PAGE_SIZE; 581 offset += PAGE_SIZE; 582 size -= PAGE_SIZE; 583 } 584 pmap_update(map->pmap); 585 586 /* 587 * zero on request (note that "size" is now zero due to the above loop 588 * so we need to subtract kva from loopva to reconstruct the size). 589 */ 590 591 if (zeroit) 592 memset((caddr_t)kva, 0, loopva - kva); 593 UVMHIST_LOG(maphist,"<- done (kva=0x%x)", kva,0,0,0); 594 return(kva); 595} 596 597/* 598 * uvm_km_valloc1: allocate zero-fill memory in the kernel's address space 599 * 600 * => memory is not allocated until fault time 601 * => the align, prefer and flags parameters are passed on to uvm_map(). 602 * 603 * Note: this function is also the backend for these macros: 604 * uvm_km_valloc 605 * uvm_km_valloc_wait 606 * uvm_km_valloc_prefer 607 * uvm_km_valloc_prefer_wait 608 * uvm_km_valloc_align 609 */ 610 611vaddr_t 612uvm_km_valloc1(map, size, align, prefer, flags) 613 struct vm_map *map; 614 vsize_t size; 615 vsize_t align; 616 voff_t prefer; 617 uvm_flag_t flags; 618{ 619 vaddr_t kva; 620 UVMHIST_FUNC("uvm_km_valloc1"); UVMHIST_CALLED(maphist); 621 622 UVMHIST_LOG(maphist, "(map=0x%x, size=0x%x, align=0x%x, prefer=0x%x)", 623 map, size, align, prefer); 624 625 KASSERT(vm_map_pmap(map) == pmap_kernel()); 626 627 size = round_page(size); 628 /* 629 * Check if requested size is larger than the map, in which 630 * case we can't succeed. 631 */ 632 if (size > vm_map_max(map) - vm_map_min(map)) 633 return (0); 634 635 for (;;) { 636 kva = vm_map_min(map); /* hint */ 637 638 /* 639 * allocate some virtual space. will be demand filled 640 * by kernel_object. 641 */ 642 643 if (__predict_true(uvm_map(map, &kva, size, uvm.kernel_object, 644 prefer, align, UVM_MAPFLAG(UVM_PROT_ALL, 645 UVM_PROT_ALL, UVM_INH_NONE, UVM_ADV_RANDOM, flags)) 646 == 0)) { 647 UVMHIST_LOG(maphist,"<- done (kva=0x%x)", kva,0,0,0); 648 return (kva); 649 } 650 651 /* 652 * failed. sleep for a while (on map) 653 */ 654 if ((flags & UVM_KMF_NOWAIT) != 0) 655 return (0); 656 657 UVMHIST_LOG(maphist,"<<<sleeping>>>",0,0,0,0); 658 tsleep((caddr_t)map, PVM, "vallocwait", 0); 659 } 660 /*NOTREACHED*/ 661} 662 663/* Function definitions for binary compatibility */ 664vaddr_t 665uvm_km_kmemalloc(struct vm_map *map, struct uvm_object *obj, 666 vsize_t sz, int flags) 667{ 668 return uvm_km_kmemalloc1(map, obj, sz, 0, UVM_UNKNOWN_OFFSET, flags); 669} 670 671vaddr_t uvm_km_valloc(struct vm_map *map, vsize_t sz) 672{ 673 return uvm_km_valloc1(map, sz, 0, UVM_UNKNOWN_OFFSET, UVM_KMF_NOWAIT); 674} 675 676vaddr_t uvm_km_valloc_align(struct vm_map *map, vsize_t sz, vsize_t align) 677{ 678 return uvm_km_valloc1(map, sz, align, UVM_UNKNOWN_OFFSET, UVM_KMF_NOWAIT); 679} 680 681vaddr_t uvm_km_valloc_prefer_wait(struct vm_map *map, vsize_t sz, voff_t prefer) 682{ 683 return uvm_km_valloc1(map, sz, 0, prefer, 0); 684} 685 686vaddr_t uvm_km_valloc_wait(struct vm_map *map, vsize_t sz) 687{ 688 return uvm_km_valloc1(map, sz, 0, UVM_UNKNOWN_OFFSET, 0); 689} 690 691/* Sanity; must specify both or none. */ 692#if (defined(PMAP_MAP_POOLPAGE) || defined(PMAP_UNMAP_POOLPAGE)) && \ 693 (!defined(PMAP_MAP_POOLPAGE) || !defined(PMAP_UNMAP_POOLPAGE)) 694#error Must specify MAP and UNMAP together. 695#endif 696 697/* 698 * uvm_km_alloc_poolpage: allocate a page for the pool allocator 699 * 700 * => if the pmap specifies an alternate mapping method, we use it. 701 */ 702 703/* ARGSUSED */ 704vaddr_t 705uvm_km_alloc_poolpage1(map, obj, waitok) 706 struct vm_map *map; 707 struct uvm_object *obj; 708 boolean_t waitok; 709{ 710#if defined(PMAP_MAP_POOLPAGE) 711 struct vm_page *pg; 712 vaddr_t va; 713 714 again: 715 pg = uvm_pagealloc(NULL, 0, NULL, UVM_PGA_USERESERVE); 716 if (__predict_false(pg == NULL)) { 717 if (waitok) { 718 uvm_wait("plpg"); 719 goto again; 720 } else 721 return (0); 722 } 723 va = PMAP_MAP_POOLPAGE(VM_PAGE_TO_PHYS(pg)); 724 if (__predict_false(va == 0)) 725 uvm_pagefree(pg); 726 return (va); 727#else 728 vaddr_t va; 729 int s; 730 731 /* 732 * NOTE: We may be called with a map that doens't require splvm 733 * protection (e.g. kernel_map). However, it does not hurt to 734 * go to splvm in this case (since unprocted maps will never be 735 * accessed in interrupt context). 736 * 737 * XXX We may want to consider changing the interface to this 738 * XXX function. 739 */ 740 741 s = splvm(); 742 va = uvm_km_kmemalloc(map, obj, PAGE_SIZE, 743 waitok ? 0 : UVM_KMF_NOWAIT | UVM_KMF_TRYLOCK); 744 splx(s); 745 return (va); 746#endif /* PMAP_MAP_POOLPAGE */ 747} 748 749/* 750 * uvm_km_free_poolpage: free a previously allocated pool page 751 * 752 * => if the pmap specifies an alternate unmapping method, we use it. 753 */ 754 755/* ARGSUSED */ 756void 757uvm_km_free_poolpage1(map, addr) 758 struct vm_map *map; 759 vaddr_t addr; 760{ 761#if defined(PMAP_UNMAP_POOLPAGE) 762 paddr_t pa; 763 764 pa = PMAP_UNMAP_POOLPAGE(addr); 765 uvm_pagefree(PHYS_TO_VM_PAGE(pa)); 766#else 767 int s; 768 769 /* 770 * NOTE: We may be called with a map that doens't require splvm 771 * protection (e.g. kernel_map). However, it does not hurt to 772 * go to splvm in this case (since unprocted maps will never be 773 * accessed in interrupt context). 774 * 775 * XXX We may want to consider changing the interface to this 776 * XXX function. 777 */ 778 779 s = splvm(); 780 uvm_km_free(map, addr, PAGE_SIZE); 781 splx(s); 782#endif /* PMAP_UNMAP_POOLPAGE */ 783} 784