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 #include <linux/highmem.h> 19 #include <linux/gfp.h> 20 21 #include <asm/mach-types.h> 22 #include <asm/sections.h> 23 #include <asm/setup.h> 24 #include <asm/sizes.h> 25 #include <asm/tlb.h> 26 #include <asm/fixmap.h> 27 28 #include <asm/mach/arch.h> 29 #include <asm/mach/map.h> 30 31 #include "mm.h" 32 33 static unsigned long phys_initrd_start __initdata = 0; 34 static unsigned long phys_initrd_size __initdata = 0; 35 36 static int __init early_initrd(char *p) 37 { 38 unsigned long start, size; 39 char *endp; 40 41 start = memparse(p, &endp); 42 if (*endp == ',') { 43 size = memparse(endp + 1, NULL); 44 45 phys_initrd_start = start; 46 phys_initrd_size = size; 47 } 48 return 0; 49 } 50 early_param("initrd", early_initrd); 51 52 static int __init parse_tag_initrd(const struct tag *tag) 53 { 54 printk(KERN_WARNING "ATAG_INITRD is deprecated; " 55 "please update your bootloader.\n"); 56 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 57 phys_initrd_size = tag->u.initrd.size; 58 return 0; 59 } 60 61 __tagtable(ATAG_INITRD, parse_tag_initrd); 62 63 static int __init parse_tag_initrd2(const struct tag *tag) 64 { 65 phys_initrd_start = tag->u.initrd.start; 66 phys_initrd_size = tag->u.initrd.size; 67 return 0; 68 } 69 70 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 71 72 /* 73 * This keeps memory configuration data used by a couple memory 74 * initialization functions, as well as show_mem() for the skipping 75 * of holes in the memory map. It is populated by arm_add_memory(). 76 */ 77 struct meminfo meminfo; 78 79 void show_mem(void) 80 { 81 int free = 0, total = 0, reserved = 0; 82 int shared = 0, cached = 0, slab = 0, i; 83 struct meminfo * mi = &meminfo; 84 85 printk("Mem-info:\n"); 86 show_free_areas(); 87 88 for_each_bank (i, mi) { 89 struct membank *bank = &mi->bank[i]; 90 unsigned int pfn1, pfn2; 91 struct page *page, *end; 92 93 pfn1 = bank_pfn_start(bank); 94 pfn2 = bank_pfn_end(bank); 95 96 page = pfn_to_page(pfn1); 97 end = pfn_to_page(pfn2 - 1) + 1; 98 99 do { 100 total++; 101 if (PageReserved(page)) 102 reserved++; 103 else if (PageSwapCache(page)) 104 cached++; 105 else if (PageSlab(page)) 106 slab++; 107 else if (!page_count(page)) 108 free++; 109 else 110 shared += page_count(page) - 1; 111 page++; 112 } while (page < end); 113 } 114 115 printk("%d pages of RAM\n", total); 116 printk("%d free pages\n", free); 117 printk("%d reserved pages\n", reserved); 118 printk("%d slab pages\n", slab); 119 printk("%d pages shared\n", shared); 120 printk("%d pages swap cached\n", cached); 121 } 122 123 static void __init find_limits(struct meminfo *mi, 124 unsigned long *min, unsigned long *max_low, unsigned long *max_high) 125 { 126 int i; 127 128 *min = -1UL; 129 *max_low = *max_high = 0; 130 131 for_each_bank (i, mi) { 132 struct membank *bank = &mi->bank[i]; 133 unsigned long start, end; 134 135 start = bank_pfn_start(bank); 136 end = bank_pfn_end(bank); 137 138 if (*min > start) 139 *min = start; 140 if (*max_high < end) 141 *max_high = end; 142 if (bank->highmem) 143 continue; 144 if (*max_low < end) 145 *max_low = end; 146 } 147 } 148 149 /* 150 * FIXME: We really want to avoid allocating the bootmap bitmap 151 * over the top of the initrd. Hopefully, this is located towards 152 * the start of a bank, so if we allocate the bootmap bitmap at 153 * the end, we won't clash. 154 */ 155 static unsigned int __init 156 find_bootmap_pfn(struct meminfo *mi, unsigned int bootmap_pages) 157 { 158 unsigned int start_pfn, i, bootmap_pfn; 159 160 start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT; 161 bootmap_pfn = 0; 162 163 for_each_bank(i, mi) { 164 struct membank *bank = &mi->bank[i]; 165 unsigned int start, end; 166 167 start = bank_pfn_start(bank); 168 end = bank_pfn_end(bank); 169 170 if (end < start_pfn) 171 continue; 172 173 if (start < start_pfn) 174 start = start_pfn; 175 176 if (end <= start) 177 continue; 178 179 if (end - start >= bootmap_pages) { 180 bootmap_pfn = start; 181 break; 182 } 183 } 184 185 if (bootmap_pfn == 0) 186 BUG(); 187 188 return bootmap_pfn; 189 } 190 191 static int __init check_initrd(struct meminfo *mi) 192 { 193 int initrd = -2; 194 #ifdef CONFIG_BLK_DEV_INITRD 195 unsigned long end = phys_initrd_start + phys_initrd_size; 196 197 /* 198 * Make sure that the initrd is within a valid area of 199 * memory. 200 */ 201 if (phys_initrd_size) { 202 unsigned int i; 203 204 initrd = -1; 205 206 for (i = 0; i < mi->nr_banks; i++) { 207 struct membank *bank = &mi->bank[i]; 208 if (bank_phys_start(bank) <= phys_initrd_start && 209 end <= bank_phys_end(bank)) 210 initrd = 0; 211 } 212 } 213 214 if (initrd == -1) { 215 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " 216 "physical memory - disabling initrd\n", 217 phys_initrd_start, phys_initrd_size); 218 phys_initrd_start = phys_initrd_size = 0; 219 } 220 #endif 221 222 return initrd; 223 } 224 225 static void __init arm_bootmem_init(struct meminfo *mi, 226 unsigned long start_pfn, unsigned long end_pfn) 227 { 228 unsigned long boot_pfn; 229 unsigned int boot_pages; 230 pg_data_t *pgdat; 231 int i; 232 233 /* 234 * Allocate the bootmem bitmap page. 235 */ 236 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 237 boot_pfn = find_bootmap_pfn(mi, boot_pages); 238 239 /* 240 * Initialise the bootmem allocator, handing the 241 * memory banks over to bootmem. 242 */ 243 node_set_online(0); 244 pgdat = NODE_DATA(0); 245 init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); 246 247 for_each_bank(i, mi) { 248 struct membank *bank = &mi->bank[i]; 249 if (!bank->highmem) 250 free_bootmem(bank_phys_start(bank), bank_phys_size(bank)); 251 } 252 253 /* 254 * Reserve the bootmem bitmap. 255 */ 256 reserve_bootmem(boot_pfn << PAGE_SHIFT, 257 boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); 258 } 259 260 static void __init bootmem_reserve_initrd(void) 261 { 262 #ifdef CONFIG_BLK_DEV_INITRD 263 int res; 264 265 res = reserve_bootmem(phys_initrd_start, 266 phys_initrd_size, BOOTMEM_EXCLUSIVE); 267 268 if (res == 0) { 269 initrd_start = __phys_to_virt(phys_initrd_start); 270 initrd_end = initrd_start + phys_initrd_size; 271 } else { 272 printk(KERN_ERR 273 "INITRD: 0x%08lx+0x%08lx overlaps in-use " 274 "memory region - disabling initrd\n", 275 phys_initrd_start, phys_initrd_size); 276 } 277 #endif 278 } 279 280 static void __init arm_bootmem_free(struct meminfo *mi) 281 { 282 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 283 unsigned long min, max_low, max_high; 284 int i; 285 286 find_limits(mi, &min, &max_low, &max_high); 287 288 /* 289 * initialise the zones. 290 */ 291 memset(zone_size, 0, sizeof(zone_size)); 292 293 /* 294 * The memory size has already been determined. If we need 295 * to do anything fancy with the allocation of this memory 296 * to the zones, now is the time to do it. 297 */ 298 zone_size[0] = max_low - min; 299 #ifdef CONFIG_HIGHMEM 300 zone_size[ZONE_HIGHMEM] = max_high - max_low; 301 #endif 302 303 /* 304 * Calculate the size of the holes. 305 * holes = node_size - sum(bank_sizes) 306 */ 307 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 308 for_each_bank(i, mi) { 309 int idx = 0; 310 #ifdef CONFIG_HIGHMEM 311 if (mi->bank[i].highmem) 312 idx = ZONE_HIGHMEM; 313 #endif 314 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]); 315 } 316 317 /* 318 * Adjust the sizes according to any special requirements for 319 * this machine type. 320 */ 321 arch_adjust_zones(zone_size, zhole_size); 322 323 free_area_init_node(0, zone_size, min, zhole_size); 324 } 325 326 #ifndef CONFIG_SPARSEMEM 327 int pfn_valid(unsigned long pfn) 328 { 329 struct meminfo *mi = &meminfo; 330 unsigned int left = 0, right = mi->nr_banks; 331 332 do { 333 unsigned int mid = (right + left) / 2; 334 struct membank *bank = &mi->bank[mid]; 335 336 if (pfn < bank_pfn_start(bank)) 337 right = mid; 338 else if (pfn >= bank_pfn_end(bank)) 339 left = mid + 1; 340 else 341 return 1; 342 } while (left < right); 343 return 0; 344 } 345 EXPORT_SYMBOL(pfn_valid); 346 347 static void arm_memory_present(struct meminfo *mi) 348 { 349 } 350 #else 351 static void arm_memory_present(struct meminfo *mi) 352 { 353 int i; 354 for_each_bank(i, mi) { 355 struct membank *bank = &mi->bank[i]; 356 memory_present(0, bank_pfn_start(bank), bank_pfn_end(bank)); 357 } 358 } 359 #endif 360 361 void __init bootmem_init(void) 362 { 363 struct meminfo *mi = &meminfo; 364 unsigned long min, max_low, max_high; 365 int initrd; 366 367 /* 368 * Locate the ramdisk image, if any. 369 */ 370 initrd = check_initrd(mi); 371 372 max_low = max_high = 0; 373 374 find_limits(mi, &min, &max_low, &max_high); 375 376 arm_bootmem_init(mi, min, max_low); 377 378 /* 379 * Reserve any special regions. 380 */ 381 reserve_special_regions(); 382 383 /* 384 * If the initrd is present, reserve its memory. 385 */ 386 if (initrd == 0) 387 bootmem_reserve_initrd(); 388 389 /* 390 * Sparsemem tries to allocate bootmem in memory_present(), 391 * so must be done after the fixed reservations 392 */ 393 arm_memory_present(mi); 394 395 /* 396 * sparse_init() needs the bootmem allocator up and running. 397 */ 398 sparse_init(); 399 400 /* 401 * Now free the memory - free_area_init_node needs 402 * the sparse mem_map arrays initialized by sparse_init() 403 * for memmap_init_zone(), otherwise all PFNs are invalid. 404 */ 405 arm_bootmem_free(mi); 406 407 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; 408 409 /* 410 * This doesn't seem to be used by the Linux memory manager any 411 * more, but is used by ll_rw_block. If we can get rid of it, we 412 * also get rid of some of the stuff above as well. 413 * 414 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 415 * the system, not the maximum PFN. 416 */ 417 max_low_pfn = max_low - PHYS_PFN_OFFSET; 418 max_pfn = max_high - PHYS_PFN_OFFSET; 419 } 420 421 static inline int free_area(unsigned long pfn, unsigned long end, char *s) 422 { 423 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 424 425 for (; pfn < end; pfn++) { 426 struct page *page = pfn_to_page(pfn); 427 ClearPageReserved(page); 428 init_page_count(page); 429 __free_page(page); 430 pages++; 431 } 432 433 if (size && s) 434 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 435 436 return pages; 437 } 438 439 static inline void 440 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 441 { 442 struct page *start_pg, *end_pg; 443 unsigned long pg, pgend; 444 445 /* 446 * Convert start_pfn/end_pfn to a struct page pointer. 447 */ 448 start_pg = pfn_to_page(start_pfn - 1) + 1; 449 end_pg = pfn_to_page(end_pfn); 450 451 /* 452 * Convert to physical addresses, and 453 * round start upwards and end downwards. 454 */ 455 pg = PAGE_ALIGN(__pa(start_pg)); 456 pgend = __pa(end_pg) & PAGE_MASK; 457 458 /* 459 * If there are free pages between these, 460 * free the section of the memmap array. 461 */ 462 if (pg < pgend) 463 free_bootmem(pg, pgend - pg); 464 } 465 466 /* 467 * The mem_map array can get very big. Free the unused area of the memory map. 468 */ 469 static void __init free_unused_memmap(struct meminfo *mi) 470 { 471 unsigned long bank_start, prev_bank_end = 0; 472 unsigned int i; 473 474 /* 475 * [FIXME] This relies on each bank being in address order. This 476 * may not be the case, especially if the user has provided the 477 * information on the command line. 478 */ 479 for_each_bank(i, mi) { 480 struct membank *bank = &mi->bank[i]; 481 482 bank_start = bank_pfn_start(bank); 483 if (bank_start < prev_bank_end) { 484 printk(KERN_ERR "MEM: unordered memory banks. " 485 "Not freeing memmap.\n"); 486 break; 487 } 488 489 /* 490 * If we had a previous bank, and there is a space 491 * between the current bank and the previous, free it. 492 */ 493 if (prev_bank_end && prev_bank_end != bank_start) 494 free_memmap(prev_bank_end, bank_start); 495 496 prev_bank_end = bank_pfn_end(bank); 497 } 498 } 499 500 /* 501 * mem_init() marks the free areas in the mem_map and tells us how much 502 * memory is free. This is done after various parts of the system have 503 * claimed their memory after the kernel image. 504 */ 505 void __init mem_init(void) 506 { 507 unsigned long reserved_pages, free_pages; 508 int i; 509 510 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 511 512 /* this will put all unused low memory onto the freelists */ 513 free_unused_memmap(&meminfo); 514 515 totalram_pages += free_all_bootmem(); 516 517 #ifdef CONFIG_SA1111 518 /* now that our DMA memory is actually so designated, we can free it */ 519 totalram_pages += free_area(PHYS_PFN_OFFSET, 520 __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 521 #endif 522 523 #ifdef CONFIG_HIGHMEM 524 /* set highmem page free */ 525 for_each_bank (i, &meminfo) { 526 unsigned long start = bank_pfn_start(&meminfo.bank[i]); 527 unsigned long end = bank_pfn_end(&meminfo.bank[i]); 528 if (start >= max_low_pfn + PHYS_PFN_OFFSET) 529 totalhigh_pages += free_area(start, end, NULL); 530 } 531 totalram_pages += totalhigh_pages; 532 #endif 533 534 reserved_pages = free_pages = 0; 535 536 for_each_bank(i, &meminfo) { 537 struct membank *bank = &meminfo.bank[i]; 538 unsigned int pfn1, pfn2; 539 struct page *page, *end; 540 541 pfn1 = bank_pfn_start(bank); 542 pfn2 = bank_pfn_end(bank); 543 544 page = pfn_to_page(pfn1); 545 end = pfn_to_page(pfn2 - 1) + 1; 546 547 do { 548 if (PageReserved(page)) 549 reserved_pages++; 550 else if (!page_count(page)) 551 free_pages++; 552 page++; 553 } while (page < end); 554 } 555 556 /* 557 * Since our memory may not be contiguous, calculate the 558 * real number of pages we have in this system 559 */ 560 printk(KERN_INFO "Memory:"); 561 num_physpages = 0; 562 for (i = 0; i < meminfo.nr_banks; i++) { 563 num_physpages += bank_pfn_size(&meminfo.bank[i]); 564 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); 565 } 566 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 567 568 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 569 nr_free_pages() << (PAGE_SHIFT-10), 570 free_pages << (PAGE_SHIFT-10), 571 reserved_pages << (PAGE_SHIFT-10), 572 totalhigh_pages << (PAGE_SHIFT-10)); 573 574 #define MLK(b, t) b, t, ((t) - (b)) >> 10 575 #define MLM(b, t) b, t, ((t) - (b)) >> 20 576 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 577 578 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 579 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 580 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 581 #ifdef CONFIG_MMU 582 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" 583 #endif 584 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 585 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 586 #ifdef CONFIG_HIGHMEM 587 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 588 #endif 589 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 590 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 591 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 592 " .data : 0x%p" " - 0x%p" " (%4d kB)\n", 593 594 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 595 (PAGE_SIZE)), 596 MLK(FIXADDR_START, FIXADDR_TOP), 597 #ifdef CONFIG_MMU 598 MLM(CONSISTENT_BASE, CONSISTENT_END), 599 #endif 600 MLM(VMALLOC_START, VMALLOC_END), 601 MLM(PAGE_OFFSET, (unsigned long)high_memory), 602 #ifdef CONFIG_HIGHMEM 603 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 604 (PAGE_SIZE)), 605 #endif 606 MLM(MODULES_VADDR, MODULES_END), 607 608 MLK_ROUNDUP(__init_begin, __init_end), 609 MLK_ROUNDUP(_text, _etext), 610 MLK_ROUNDUP(_data, _edata)); 611 612 #undef MLK 613 #undef MLM 614 #undef MLK_ROUNDUP 615 616 /* 617 * Check boundaries twice: Some fundamental inconsistencies can 618 * be detected at build time already. 619 */ 620 #ifdef CONFIG_MMU 621 BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); 622 BUG_ON(VMALLOC_END > CONSISTENT_BASE); 623 624 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 625 BUG_ON(TASK_SIZE > MODULES_VADDR); 626 #endif 627 628 #ifdef CONFIG_HIGHMEM 629 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 630 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 631 #endif 632 633 if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 634 extern int sysctl_overcommit_memory; 635 /* 636 * On a machine this small we won't get 637 * anywhere without overcommit, so turn 638 * it on by default. 639 */ 640 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 641 } 642 } 643 644 void free_initmem(void) 645 { 646 #ifdef CONFIG_HAVE_TCM 647 extern char __tcm_start, __tcm_end; 648 649 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 650 __phys_to_pfn(__pa(&__tcm_end)), 651 "TCM link"); 652 #endif 653 654 if (!machine_is_integrator() && !machine_is_cintegrator()) 655 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 656 __phys_to_pfn(__pa(__init_end)), 657 "init"); 658 } 659 660 #ifdef CONFIG_BLK_DEV_INITRD 661 662 static int keep_initrd; 663 664 void free_initrd_mem(unsigned long start, unsigned long end) 665 { 666 if (!keep_initrd) 667 totalram_pages += free_area(__phys_to_pfn(__pa(start)), 668 __phys_to_pfn(__pa(end)), 669 "initrd"); 670 } 671 672 static int __init keepinitrd_setup(char *__unused) 673 { 674 keep_initrd = 1; 675 return 1; 676 } 677 678 __setup("keepinitrd", keepinitrd_setup); 679 #endif 680