vm_kern.c (38799) | vm_kern.c (42957) |
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1/* 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * The Mach Operating System project at Carnegie-Mellon University. 7 * 8 * Redistribution and use in source and binary forms, with or without --- 47 unchanged lines hidden (view full) --- 56 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 57 * School of Computer Science 58 * Carnegie Mellon University 59 * Pittsburgh PA 15213-3890 60 * 61 * any improvements or extensions that they make and grant Carnegie the 62 * rights to redistribute these changes. 63 * | 1/* 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * The Mach Operating System project at Carnegie-Mellon University. 7 * 8 * Redistribution and use in source and binary forms, with or without --- 47 unchanged lines hidden (view full) --- 56 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 57 * School of Computer Science 58 * Carnegie Mellon University 59 * Pittsburgh PA 15213-3890 60 * 61 * any improvements or extensions that they make and grant Carnegie the 62 * rights to redistribute these changes. 63 * |
64 * $Id: vm_kern.c,v 1.49 1998/08/24 08:39:37 dfr Exp $ | 64 * $Id: vm_kern.c,v 1.50 1998/09/04 08:06:57 dfr Exp $ |
65 */ 66 67/* 68 * Kernel memory management. 69 */ 70 71#include <sys/param.h> 72#include <sys/systm.h> --- 103 unchanged lines hidden (view full) --- 176 177 for (i = 0; i < size; i += PAGE_SIZE) { 178 vm_page_t mem; 179 180 mem = vm_page_grab(kernel_object, OFF_TO_IDX(offset + i), 181 VM_ALLOC_ZERO | VM_ALLOC_RETRY); 182 if ((mem->flags & PG_ZERO) == 0) 183 vm_page_zero_fill(mem); | 65 */ 66 67/* 68 * Kernel memory management. 69 */ 70 71#include <sys/param.h> 72#include <sys/systm.h> --- 103 unchanged lines hidden (view full) --- 176 177 for (i = 0; i < size; i += PAGE_SIZE) { 178 vm_page_t mem; 179 180 mem = vm_page_grab(kernel_object, OFF_TO_IDX(offset + i), 181 VM_ALLOC_ZERO | VM_ALLOC_RETRY); 182 if ((mem->flags & PG_ZERO) == 0) 183 vm_page_zero_fill(mem); |
184 vm_page_flag_clear(mem, (PG_BUSY | PG_ZERO)); | |
185 mem->valid = VM_PAGE_BITS_ALL; | 184 mem->valid = VM_PAGE_BITS_ALL; |
185 vm_page_flag_clear(mem, PG_ZERO); 186 vm_page_wakeup(mem); |
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186 } 187 188 /* 189 * And finally, mark the data as non-pageable. 190 */ 191 192 (void) vm_map_pageable(map, (vm_offset_t) addr, addr + size, FALSE); 193 194 return (addr); 195} 196 197/* 198 * kmem_free: 199 * 200 * Release a region of kernel virtual memory allocated 201 * with kmem_alloc, and return the physical pages 202 * associated with that region. | 187 } 188 189 /* 190 * And finally, mark the data as non-pageable. 191 */ 192 193 (void) vm_map_pageable(map, (vm_offset_t) addr, addr + size, FALSE); 194 195 return (addr); 196} 197 198/* 199 * kmem_free: 200 * 201 * Release a region of kernel virtual memory allocated 202 * with kmem_alloc, and return the physical pages 203 * associated with that region. |
204 * 205 * This routine may not block on kernel maps. |
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203 */ 204void 205kmem_free(map, addr, size) 206 vm_map_t map; 207 register vm_offset_t addr; 208 vm_size_t size; 209{ 210 (void) vm_map_remove(map, trunc_page(addr), round_page(addr + size)); --- 36 unchanged lines hidden (view full) --- 247 if (result == NULL) 248 panic("kmem_suballoc: cannot create submap"); 249 if ((ret = vm_map_submap(parent, *min, *max, result)) != KERN_SUCCESS) 250 panic("kmem_suballoc: unable to change range to submap"); 251 return (result); 252} 253 254/* | 206 */ 207void 208kmem_free(map, addr, size) 209 vm_map_t map; 210 register vm_offset_t addr; 211 vm_size_t size; 212{ 213 (void) vm_map_remove(map, trunc_page(addr), round_page(addr + size)); --- 36 unchanged lines hidden (view full) --- 250 if (result == NULL) 251 panic("kmem_suballoc: cannot create submap"); 252 if ((ret = vm_map_submap(parent, *min, *max, result)) != KERN_SUCCESS) 253 panic("kmem_suballoc: unable to change range to submap"); 254 return (result); 255} 256 257/* |
255 * Allocate wired-down memory in the kernel's address map for the higher 256 * level kernel memory allocator (kern/kern_malloc.c). We cannot use 257 * kmem_alloc() because we may need to allocate memory at interrupt 258 * level where we cannot block (canwait == FALSE). | 258 * kmem_malloc: |
259 * | 259 * |
260 * This routine has its own private kernel submap (kmem_map) and object 261 * (kmem_object). This, combined with the fact that only malloc uses 262 * this routine, ensures that we will never block in map or object waits. | 260 * Allocate wired-down memory in the kernel's address map for the higher 261 * level kernel memory allocator (kern/kern_malloc.c). We cannot use 262 * kmem_alloc() because we may need to allocate memory at interrupt 263 * level where we cannot block (canwait == FALSE). |
263 * | 264 * |
264 * Note that this still only works in a uni-processor environment and 265 * when called at splhigh(). | 265 * This routine has its own private kernel submap (kmem_map) and object 266 * (kmem_object). This, combined with the fact that only malloc uses 267 * this routine, ensures that we will never block in map or object waits. |
266 * | 268 * |
267 * We don't worry about expanding the map (adding entries) since entries 268 * for wired maps are statically allocated. | 269 * Note that this still only works in a uni-processor environment and 270 * when called at splhigh(). 271 * 272 * We don't worry about expanding the map (adding entries) since entries 273 * for wired maps are statically allocated. 274 * 275 * NOTE: This routine is not supposed to block if M_NOWAIT is set, but 276 * I have not verified that it actually does not block. |
269 */ 270vm_offset_t | 277 */ 278vm_offset_t |
271kmem_malloc(map, size, waitflag) | 279kmem_malloc(map, size, flags) |
272 register vm_map_t map; 273 register vm_size_t size; | 280 register vm_map_t map; 281 register vm_size_t size; |
274 boolean_t waitflag; | 282 int flags; |
275{ 276 register vm_offset_t offset, i; 277 vm_map_entry_t entry; 278 vm_offset_t addr; 279 vm_page_t m; 280 281 if (map != kmem_map && map != mb_map) 282 panic("kmem_malloc: map != {kmem,mb}_map"); --- 9 unchanged lines hidden (view full) --- 292 vm_map_lock(map); 293 if (vm_map_findspace(map, vm_map_min(map), size, &addr)) { 294 vm_map_unlock(map); 295 if (map == mb_map) { 296 mb_map_full = TRUE; 297 printf("Out of mbuf clusters - adjust NMBCLUSTERS or increase maxusers!\n"); 298 return (0); 299 } | 283{ 284 register vm_offset_t offset, i; 285 vm_map_entry_t entry; 286 vm_offset_t addr; 287 vm_page_t m; 288 289 if (map != kmem_map && map != mb_map) 290 panic("kmem_malloc: map != {kmem,mb}_map"); --- 9 unchanged lines hidden (view full) --- 300 vm_map_lock(map); 301 if (vm_map_findspace(map, vm_map_min(map), size, &addr)) { 302 vm_map_unlock(map); 303 if (map == mb_map) { 304 mb_map_full = TRUE; 305 printf("Out of mbuf clusters - adjust NMBCLUSTERS or increase maxusers!\n"); 306 return (0); 307 } |
300 if (waitflag == M_WAITOK) | 308 if ((flags & M_NOWAIT) == 0) |
301 panic("kmem_malloc(%d): kmem_map too small: %d total allocated", 302 size, map->size); 303 return (0); 304 } 305 offset = addr - VM_MIN_KERNEL_ADDRESS; 306 vm_object_reference(kmem_object); 307 vm_map_insert(map, kmem_object, offset, addr, addr + size, 308 VM_PROT_ALL, VM_PROT_ALL, 0); 309 310 for (i = 0; i < size; i += PAGE_SIZE) { | 309 panic("kmem_malloc(%d): kmem_map too small: %d total allocated", 310 size, map->size); 311 return (0); 312 } 313 offset = addr - VM_MIN_KERNEL_ADDRESS; 314 vm_object_reference(kmem_object); 315 vm_map_insert(map, kmem_object, offset, addr, addr + size, 316 VM_PROT_ALL, VM_PROT_ALL, 0); 317 318 for (i = 0; i < size; i += PAGE_SIZE) { |
319 /* 320 * Note: if M_NOWAIT specified alone, allocate from 321 * interrupt-safe queues only (just the free list). If 322 * M_ASLEEP or M_USE_RESERVE is also specified, we can also 323 * allocate from the cache. Neither of the latter two 324 * flags may be specified from an interrupt since interrupts 325 * are not allowed to mess with the cache queue. 326 */ |
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311retry: 312 m = vm_page_alloc(kmem_object, OFF_TO_IDX(offset + i), | 327retry: 328 m = vm_page_alloc(kmem_object, OFF_TO_IDX(offset + i), |
313 (waitflag == M_NOWAIT) ? VM_ALLOC_INTERRUPT : VM_ALLOC_SYSTEM); | 329 ((flags & (M_NOWAIT|M_ASLEEP|M_USE_RESERVE)) == M_NOWAIT) ? 330 VM_ALLOC_INTERRUPT : 331 VM_ALLOC_SYSTEM); |
314 315 /* 316 * Ran out of space, free everything up and return. Don't need 317 * to lock page queues here as we know that the pages we got 318 * aren't on any queues. 319 */ 320 if (m == NULL) { | 332 333 /* 334 * Ran out of space, free everything up and return. Don't need 335 * to lock page queues here as we know that the pages we got 336 * aren't on any queues. 337 */ 338 if (m == NULL) { |
321 if (waitflag == M_WAITOK) { | 339 if ((flags & M_NOWAIT) == 0) { |
322 VM_WAIT; 323 goto retry; 324 } 325 while (i != 0) { 326 i -= PAGE_SIZE; 327 m = vm_page_lookup(kmem_object, 328 OFF_TO_IDX(offset + i)); 329 vm_page_free(m); 330 } 331 vm_map_delete(map, addr, addr + size); 332 vm_map_unlock(map); | 340 VM_WAIT; 341 goto retry; 342 } 343 while (i != 0) { 344 i -= PAGE_SIZE; 345 m = vm_page_lookup(kmem_object, 346 OFF_TO_IDX(offset + i)); 347 vm_page_free(m); 348 } 349 vm_map_delete(map, addr, addr + size); 350 vm_map_unlock(map); |
351 if (flags & M_ASLEEP) { 352 VM_AWAIT; 353 } |
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333 return (0); 334 } 335 vm_page_flag_clear(m, PG_ZERO); 336 m->valid = VM_PAGE_BITS_ALL; 337 } 338 339 /* 340 * Mark map entry as non-pageable. Assert: vm_map_insert() will never --- 13 unchanged lines hidden (view full) --- 354 * Loop thru pages, entering them in the pmap. (We cannot add them to 355 * the wired count without wrapping the vm_page_queue_lock in 356 * splimp...) 357 */ 358 for (i = 0; i < size; i += PAGE_SIZE) { 359 m = vm_page_lookup(kmem_object, OFF_TO_IDX(offset + i)); 360 vm_page_wire(m); 361 vm_page_wakeup(m); | 354 return (0); 355 } 356 vm_page_flag_clear(m, PG_ZERO); 357 m->valid = VM_PAGE_BITS_ALL; 358 } 359 360 /* 361 * Mark map entry as non-pageable. Assert: vm_map_insert() will never --- 13 unchanged lines hidden (view full) --- 375 * Loop thru pages, entering them in the pmap. (We cannot add them to 376 * the wired count without wrapping the vm_page_queue_lock in 377 * splimp...) 378 */ 379 for (i = 0; i < size; i += PAGE_SIZE) { 380 m = vm_page_lookup(kmem_object, OFF_TO_IDX(offset + i)); 381 vm_page_wire(m); 382 vm_page_wakeup(m); |
383 /* 384 * Because this is kernel_pmap, this call will not block. 385 */ |
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362 pmap_enter(kernel_pmap, addr + i, VM_PAGE_TO_PHYS(m), 363 VM_PROT_ALL, 1); 364 vm_page_flag_set(m, PG_MAPPED | PG_WRITEABLE | PG_REFERENCED); 365 } 366 vm_map_unlock(map); 367 368 return (addr); 369} 370 371/* | 386 pmap_enter(kernel_pmap, addr + i, VM_PAGE_TO_PHYS(m), 387 VM_PROT_ALL, 1); 388 vm_page_flag_set(m, PG_MAPPED | PG_WRITEABLE | PG_REFERENCED); 389 } 390 vm_map_unlock(map); 391 392 return (addr); 393} 394 395/* |
372 * kmem_alloc_wait | 396 * kmem_alloc_wait: |
373 * 374 * Allocates pageable memory from a sub-map of the kernel. If the submap 375 * has no room, the caller sleeps waiting for more memory in the submap. 376 * | 397 * 398 * Allocates pageable memory from a sub-map of the kernel. If the submap 399 * has no room, the caller sleeps waiting for more memory in the submap. 400 * |
401 * This routine may block. |
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377 */ | 402 */ |
403 |
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378vm_offset_t 379kmem_alloc_wait(map, size) 380 vm_map_t map; 381 vm_size_t size; 382{ 383 vm_offset_t addr; 384 385 size = round_page(size); --- 15 unchanged lines hidden (view full) --- 401 tsleep(map, PVM, "kmaw", 0); 402 } 403 vm_map_insert(map, NULL, (vm_offset_t) 0, addr, addr + size, VM_PROT_ALL, VM_PROT_ALL, 0); 404 vm_map_unlock(map); 405 return (addr); 406} 407 408/* | 404vm_offset_t 405kmem_alloc_wait(map, size) 406 vm_map_t map; 407 vm_size_t size; 408{ 409 vm_offset_t addr; 410 411 size = round_page(size); --- 15 unchanged lines hidden (view full) --- 427 tsleep(map, PVM, "kmaw", 0); 428 } 429 vm_map_insert(map, NULL, (vm_offset_t) 0, addr, addr + size, VM_PROT_ALL, VM_PROT_ALL, 0); 430 vm_map_unlock(map); 431 return (addr); 432} 433 434/* |
409 * kmem_free_wakeup | 435 * kmem_free_wakeup: |
410 * 411 * Returns memory to a submap of the kernel, and wakes up any processes 412 * waiting for memory in that map. 413 */ 414void 415kmem_free_wakeup(map, addr, size) 416 vm_map_t map; 417 vm_offset_t addr; 418 vm_size_t size; 419{ 420 vm_map_lock(map); 421 (void) vm_map_delete(map, trunc_page(addr), round_page(addr + size)); 422 wakeup(map); 423 vm_map_unlock(map); 424} 425 426/* | 436 * 437 * Returns memory to a submap of the kernel, and wakes up any processes 438 * waiting for memory in that map. 439 */ 440void 441kmem_free_wakeup(map, addr, size) 442 vm_map_t map; 443 vm_offset_t addr; 444 vm_size_t size; 445{ 446 vm_map_lock(map); 447 (void) vm_map_delete(map, trunc_page(addr), round_page(addr + size)); 448 wakeup(map); 449 vm_map_unlock(map); 450} 451 452/* |
427 * Create the kernel map; insert a mapping covering kernel text, data, bss, 428 * and all space allocated thus far (`boostrap' data). The new map will thus 429 * map the range between VM_MIN_KERNEL_ADDRESS and `start' as allocated, and 430 * the range between `start' and `end' as free. | 453 * kmem_init: 454 * 455 * Create the kernel map; insert a mapping covering kernel text, 456 * data, bss, and all space allocated thus far (`boostrap' data). The 457 * new map will thus map the range between VM_MIN_KERNEL_ADDRESS and 458 * `start' as allocated, and the range between `start' and `end' as free. |
431 */ | 459 */ |
460 |
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432void 433kmem_init(start, end) 434 vm_offset_t start, end; 435{ 436 register vm_map_t m; 437 438 m = vm_map_create(kernel_pmap, VM_MIN_KERNEL_ADDRESS, end); 439 vm_map_lock(m); 440 /* N.B.: cannot use kgdb to debug, starting with this assignment ... */ 441 kernel_map = m; 442 kernel_map->system_map = 1; 443 (void) vm_map_insert(m, NULL, (vm_offset_t) 0, 444 VM_MIN_KERNEL_ADDRESS, start, VM_PROT_ALL, VM_PROT_ALL, 0); 445 /* ... and ending with the completion of the above `insert' */ 446 vm_map_unlock(m); 447} | 461void 462kmem_init(start, end) 463 vm_offset_t start, end; 464{ 465 register vm_map_t m; 466 467 m = vm_map_create(kernel_pmap, VM_MIN_KERNEL_ADDRESS, end); 468 vm_map_lock(m); 469 /* N.B.: cannot use kgdb to debug, starting with this assignment ... */ 470 kernel_map = m; 471 kernel_map->system_map = 1; 472 (void) vm_map_insert(m, NULL, (vm_offset_t) 0, 473 VM_MIN_KERNEL_ADDRESS, start, VM_PROT_ALL, VM_PROT_ALL, 0); 474 /* ... and ending with the completion of the above `insert' */ 475 vm_map_unlock(m); 476} |
477 |
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