1 /* 2 * linux/arch/arm/mm/init.c 3 * 4 * Copyright (C) 1995-2005 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 #include <linux/kernel.h> 11 #include <linux/errno.h> 12 #include <linux/swap.h> 13 #include <linux/init.h> 14 #include <linux/bootmem.h> 15 #include <linux/mman.h> 16 #include <linux/nodemask.h> 17 #include <linux/initrd.h> 18 19 #include <asm/mach-types.h> 20 #include <asm/setup.h> 21 #include <asm/sizes.h> 22 #include <asm/tlb.h> 23 24 #include <asm/mach/arch.h> 25 #include <asm/mach/map.h> 26 27 #include "mm.h" 28 29 static unsigned long phys_initrd_start __initdata = 0; 30 static unsigned long phys_initrd_size __initdata = 0; 31 32 static void __init early_initrd(char **p) 33 { 34 unsigned long start, size; 35 36 start = memparse(*p, p); 37 if (**p == ',') { 38 size = memparse((*p) + 1, p); 39 40 phys_initrd_start = start; 41 phys_initrd_size = size; 42 } 43 } 44 __early_param("initrd=", early_initrd); 45 46 static int __init parse_tag_initrd(const struct tag *tag) 47 { 48 printk(KERN_WARNING "ATAG_INITRD is deprecated; " 49 "please update your bootloader.\n"); 50 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 51 phys_initrd_size = tag->u.initrd.size; 52 return 0; 53 } 54 55 __tagtable(ATAG_INITRD, parse_tag_initrd); 56 57 static int __init parse_tag_initrd2(const struct tag *tag) 58 { 59 phys_initrd_start = tag->u.initrd.start; 60 phys_initrd_size = tag->u.initrd.size; 61 return 0; 62 } 63 64 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 65 66 /* 67 * This keeps memory configuration data used by a couple memory 68 * initialization functions, as well as show_mem() for the skipping 69 * of holes in the memory map. It is populated by arm_add_memory(). 70 */ 71 struct meminfo meminfo; 72 73 void show_mem(void) 74 { 75 int free = 0, total = 0, reserved = 0; 76 int shared = 0, cached = 0, slab = 0, node, i; 77 struct meminfo * mi = &meminfo; 78 79 printk("Mem-info:\n"); 80 show_free_areas(); 81 for_each_online_node(node) { 82 pg_data_t *n = NODE_DATA(node); 83 struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; 84 85 for_each_nodebank (i,mi,node) { 86 struct membank *bank = &mi->bank[i]; 87 unsigned int pfn1, pfn2; 88 struct page *page, *end; 89 90 pfn1 = bank_pfn_start(bank); 91 pfn2 = bank_pfn_end(bank); 92 93 page = map + pfn1; 94 end = map + pfn2; 95 96 do { 97 total++; 98 if (PageReserved(page)) 99 reserved++; 100 else if (PageSwapCache(page)) 101 cached++; 102 else if (PageSlab(page)) 103 slab++; 104 else if (!page_count(page)) 105 free++; 106 else 107 shared += page_count(page) - 1; 108 page++; 109 } while (page < end); 110 } 111 } 112 113 printk("%d pages of RAM\n", total); 114 printk("%d free pages\n", free); 115 printk("%d reserved pages\n", reserved); 116 printk("%d slab pages\n", slab); 117 printk("%d pages shared\n", shared); 118 printk("%d pages swap cached\n", cached); 119 } 120 121 /* 122 * FIXME: We really want to avoid allocating the bootmap bitmap 123 * over the top of the initrd. Hopefully, this is located towards 124 * the start of a bank, so if we allocate the bootmap bitmap at 125 * the end, we won't clash. 126 */ 127 static unsigned int __init 128 find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) 129 { 130 unsigned int start_pfn, i, bootmap_pfn; 131 132 start_pfn = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT; 133 bootmap_pfn = 0; 134 135 for_each_nodebank(i, mi, node) { 136 struct membank *bank = &mi->bank[i]; 137 unsigned int start, end; 138 139 start = bank_pfn_start(bank); 140 end = bank_pfn_end(bank); 141 142 if (end < start_pfn) 143 continue; 144 145 if (start < start_pfn) 146 start = start_pfn; 147 148 if (end <= start) 149 continue; 150 151 if (end - start >= bootmap_pages) { 152 bootmap_pfn = start; 153 break; 154 } 155 } 156 157 if (bootmap_pfn == 0) 158 BUG(); 159 160 return bootmap_pfn; 161 } 162 163 static int __init check_initrd(struct meminfo *mi) 164 { 165 int initrd_node = -2; 166 #ifdef CONFIG_BLK_DEV_INITRD 167 unsigned long end = phys_initrd_start + phys_initrd_size; 168 169 /* 170 * Make sure that the initrd is within a valid area of 171 * memory. 172 */ 173 if (phys_initrd_size) { 174 unsigned int i; 175 176 initrd_node = -1; 177 178 for (i = 0; i < mi->nr_banks; i++) { 179 struct membank *bank = &mi->bank[i]; 180 if (bank_phys_start(bank) <= phys_initrd_start && 181 end <= bank_phys_end(bank)) 182 initrd_node = bank->node; 183 } 184 } 185 186 if (initrd_node == -1) { 187 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " 188 "physical memory - disabling initrd\n", 189 phys_initrd_start, phys_initrd_size); 190 phys_initrd_start = phys_initrd_size = 0; 191 } 192 #endif 193 194 return initrd_node; 195 } 196 197 static inline void map_memory_bank(struct membank *bank) 198 { 199 #ifdef CONFIG_MMU 200 struct map_desc map; 201 202 map.pfn = bank_pfn_start(bank); 203 map.virtual = __phys_to_virt(bank_phys_start(bank)); 204 map.length = bank_phys_size(bank); 205 map.type = MT_MEMORY; 206 207 create_mapping(&map); 208 #endif 209 } 210 211 static unsigned long __init bootmem_init_node(int node, struct meminfo *mi) 212 { 213 unsigned long start_pfn, end_pfn, boot_pfn; 214 unsigned int boot_pages; 215 pg_data_t *pgdat; 216 int i; 217 218 start_pfn = -1UL; 219 end_pfn = 0; 220 221 /* 222 * Calculate the pfn range, and map the memory banks for this node. 223 */ 224 for_each_nodebank(i, mi, node) { 225 struct membank *bank = &mi->bank[i]; 226 unsigned long start, end; 227 228 start = bank_pfn_start(bank); 229 end = bank_pfn_end(bank); 230 231 if (start_pfn > start) 232 start_pfn = start; 233 if (end_pfn < end) 234 end_pfn = end; 235 236 map_memory_bank(bank); 237 } 238 239 /* 240 * If there is no memory in this node, ignore it. 241 */ 242 if (end_pfn == 0) 243 return end_pfn; 244 245 /* 246 * Allocate the bootmem bitmap page. 247 */ 248 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 249 boot_pfn = find_bootmap_pfn(node, mi, boot_pages); 250 251 /* 252 * Initialise the bootmem allocator for this node, handing the 253 * memory banks over to bootmem. 254 */ 255 node_set_online(node); 256 pgdat = NODE_DATA(node); 257 init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); 258 259 for_each_nodebank(i, mi, node) { 260 struct membank *bank = &mi->bank[i]; 261 free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank)); 262 memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank)); 263 } 264 265 /* 266 * Reserve the bootmem bitmap for this node. 267 */ 268 reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, 269 boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); 270 271 return end_pfn; 272 } 273 274 static void __init bootmem_reserve_initrd(int node) 275 { 276 #ifdef CONFIG_BLK_DEV_INITRD 277 pg_data_t *pgdat = NODE_DATA(node); 278 int res; 279 280 res = reserve_bootmem_node(pgdat, phys_initrd_start, 281 phys_initrd_size, BOOTMEM_EXCLUSIVE); 282 283 if (res == 0) { 284 initrd_start = __phys_to_virt(phys_initrd_start); 285 initrd_end = initrd_start + phys_initrd_size; 286 } else { 287 printk(KERN_ERR 288 "INITRD: 0x%08lx+0x%08lx overlaps in-use " 289 "memory region - disabling initrd\n", 290 phys_initrd_start, phys_initrd_size); 291 } 292 #endif 293 } 294 295 static void __init bootmem_free_node(int node, struct meminfo *mi) 296 { 297 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 298 unsigned long start_pfn, end_pfn; 299 pg_data_t *pgdat = NODE_DATA(node); 300 int i; 301 302 start_pfn = pgdat->bdata->node_min_pfn; 303 end_pfn = pgdat->bdata->node_low_pfn; 304 305 /* 306 * initialise the zones within this node. 307 */ 308 memset(zone_size, 0, sizeof(zone_size)); 309 memset(zhole_size, 0, sizeof(zhole_size)); 310 311 /* 312 * The size of this node has already been determined. If we need 313 * to do anything fancy with the allocation of this memory to the 314 * zones, now is the time to do it. 315 */ 316 zone_size[0] = end_pfn - start_pfn; 317 318 /* 319 * For each bank in this node, calculate the size of the holes. 320 * holes = node_size - sum(bank_sizes_in_node) 321 */ 322 zhole_size[0] = zone_size[0]; 323 for_each_nodebank(i, mi, node) 324 zhole_size[0] -= bank_pfn_size(&mi->bank[i]); 325 326 /* 327 * Adjust the sizes according to any special requirements for 328 * this machine type. 329 */ 330 arch_adjust_zones(node, zone_size, zhole_size); 331 332 free_area_init_node(node, zone_size, start_pfn, zhole_size); 333 } 334 335 void __init bootmem_init(void) 336 { 337 struct meminfo *mi = &meminfo; 338 unsigned long memend_pfn = 0; 339 int node, initrd_node; 340 341 /* 342 * Locate which node contains the ramdisk image, if any. 343 */ 344 initrd_node = check_initrd(mi); 345 346 /* 347 * Run through each node initialising the bootmem allocator. 348 */ 349 for_each_node(node) { 350 unsigned long end_pfn = bootmem_init_node(node, mi); 351 352 /* 353 * Reserve any special node zero regions. 354 */ 355 if (node == 0) 356 reserve_node_zero(NODE_DATA(node)); 357 358 /* 359 * If the initrd is in this node, reserve its memory. 360 */ 361 if (node == initrd_node) 362 bootmem_reserve_initrd(node); 363 364 /* 365 * Remember the highest memory PFN. 366 */ 367 if (end_pfn > memend_pfn) 368 memend_pfn = end_pfn; 369 } 370 371 /* 372 * sparse_init() needs the bootmem allocator up and running. 373 */ 374 sparse_init(); 375 376 /* 377 * Now free memory in each node - free_area_init_node needs 378 * the sparse mem_map arrays initialized by sparse_init() 379 * for memmap_init_zone(), otherwise all PFNs are invalid. 380 */ 381 for_each_node(node) 382 bootmem_free_node(node, mi); 383 384 high_memory = __va(memend_pfn << PAGE_SHIFT); 385 386 /* 387 * This doesn't seem to be used by the Linux memory manager any 388 * more, but is used by ll_rw_block. If we can get rid of it, we 389 * also get rid of some of the stuff above as well. 390 * 391 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 392 * the system, not the maximum PFN. 393 */ 394 max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET; 395 } 396 397 static inline void free_area(unsigned long addr, unsigned long end, char *s) 398 { 399 unsigned int size = (end - addr) >> 10; 400 401 for (; addr < end; addr += PAGE_SIZE) { 402 struct page *page = virt_to_page(addr); 403 ClearPageReserved(page); 404 init_page_count(page); 405 free_page(addr); 406 totalram_pages++; 407 } 408 409 if (size && s) 410 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 411 } 412 413 static inline void 414 free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) 415 { 416 struct page *start_pg, *end_pg; 417 unsigned long pg, pgend; 418 419 /* 420 * Convert start_pfn/end_pfn to a struct page pointer. 421 */ 422 start_pg = pfn_to_page(start_pfn); 423 end_pg = pfn_to_page(end_pfn); 424 425 /* 426 * Convert to physical addresses, and 427 * round start upwards and end downwards. 428 */ 429 pg = PAGE_ALIGN(__pa(start_pg)); 430 pgend = __pa(end_pg) & PAGE_MASK; 431 432 /* 433 * If there are free pages between these, 434 * free the section of the memmap array. 435 */ 436 if (pg < pgend) 437 free_bootmem_node(NODE_DATA(node), pg, pgend - pg); 438 } 439 440 /* 441 * The mem_map array can get very big. Free the unused area of the memory map. 442 */ 443 static void __init free_unused_memmap_node(int node, struct meminfo *mi) 444 { 445 unsigned long bank_start, prev_bank_end = 0; 446 unsigned int i; 447 448 /* 449 * [FIXME] This relies on each bank being in address order. This 450 * may not be the case, especially if the user has provided the 451 * information on the command line. 452 */ 453 for_each_nodebank(i, mi, node) { 454 struct membank *bank = &mi->bank[i]; 455 456 bank_start = bank_pfn_start(bank); 457 if (bank_start < prev_bank_end) { 458 printk(KERN_ERR "MEM: unordered memory banks. " 459 "Not freeing memmap.\n"); 460 break; 461 } 462 463 /* 464 * If we had a previous bank, and there is a space 465 * between the current bank and the previous, free it. 466 */ 467 if (prev_bank_end && prev_bank_end != bank_start) 468 free_memmap(node, prev_bank_end, bank_start); 469 470 prev_bank_end = bank_pfn_end(bank); 471 } 472 } 473 474 /* 475 * mem_init() marks the free areas in the mem_map and tells us how much 476 * memory is free. This is done after various parts of the system have 477 * claimed their memory after the kernel image. 478 */ 479 void __init mem_init(void) 480 { 481 unsigned int codepages, datapages, initpages; 482 int i, node; 483 484 codepages = &_etext - &_text; 485 datapages = &_end - &__data_start; 486 initpages = &__init_end - &__init_begin; 487 488 #ifndef CONFIG_DISCONTIGMEM 489 max_mapnr = virt_to_page(high_memory) - mem_map; 490 #endif 491 492 /* this will put all unused low memory onto the freelists */ 493 for_each_online_node(node) { 494 pg_data_t *pgdat = NODE_DATA(node); 495 496 free_unused_memmap_node(node, &meminfo); 497 498 if (pgdat->node_spanned_pages != 0) 499 totalram_pages += free_all_bootmem_node(pgdat); 500 } 501 502 #ifdef CONFIG_SA1111 503 /* now that our DMA memory is actually so designated, we can free it */ 504 free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL); 505 #endif 506 507 /* 508 * Since our memory may not be contiguous, calculate the 509 * real number of pages we have in this system 510 */ 511 printk(KERN_INFO "Memory:"); 512 513 num_physpages = 0; 514 for (i = 0; i < meminfo.nr_banks; i++) { 515 num_physpages += bank_pfn_size(&meminfo.bank[i]); 516 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); 517 } 518 519 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 520 printk(KERN_NOTICE "Memory: %luKB available (%dK code, " 521 "%dK data, %dK init)\n", 522 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 523 codepages >> 10, datapages >> 10, initpages >> 10); 524 525 if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 526 extern int sysctl_overcommit_memory; 527 /* 528 * On a machine this small we won't get 529 * anywhere without overcommit, so turn 530 * it on by default. 531 */ 532 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 533 } 534 } 535 536 void free_initmem(void) 537 { 538 if (!machine_is_integrator() && !machine_is_cintegrator()) { 539 free_area((unsigned long)(&__init_begin), 540 (unsigned long)(&__init_end), 541 "init"); 542 } 543 } 544 545 #ifdef CONFIG_BLK_DEV_INITRD 546 547 static int keep_initrd; 548 549 void free_initrd_mem(unsigned long start, unsigned long end) 550 { 551 if (!keep_initrd) 552 free_area(start, end, "initrd"); 553 } 554 555 static int __init keepinitrd_setup(char *__unused) 556 { 557 keep_initrd = 1; 558 return 1; 559 } 560 561 __setup("keepinitrd", keepinitrd_setup); 562 #endif 563