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 #include <linux/memblock.h> 21 22 #include <asm/mach-types.h> 23 #include <asm/sections.h> 24 #include <asm/setup.h> 25 #include <asm/sizes.h> 26 #include <asm/tlb.h> 27 #include <asm/fixmap.h> 28 29 #include <asm/mach/arch.h> 30 #include <asm/mach/map.h> 31 32 #include "mm.h" 33 34 static unsigned long phys_initrd_start __initdata = 0; 35 static unsigned long phys_initrd_size __initdata = 0; 36 37 static int __init early_initrd(char *p) 38 { 39 unsigned long start, size; 40 char *endp; 41 42 start = memparse(p, &endp); 43 if (*endp == ',') { 44 size = memparse(endp + 1, NULL); 45 46 phys_initrd_start = start; 47 phys_initrd_size = size; 48 } 49 return 0; 50 } 51 early_param("initrd", early_initrd); 52 53 static int __init parse_tag_initrd(const struct tag *tag) 54 { 55 printk(KERN_WARNING "ATAG_INITRD is deprecated; " 56 "please update your bootloader.\n"); 57 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 58 phys_initrd_size = tag->u.initrd.size; 59 return 0; 60 } 61 62 __tagtable(ATAG_INITRD, parse_tag_initrd); 63 64 static int __init parse_tag_initrd2(const struct tag *tag) 65 { 66 phys_initrd_start = tag->u.initrd.start; 67 phys_initrd_size = tag->u.initrd.size; 68 return 0; 69 } 70 71 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 72 73 /* 74 * This keeps memory configuration data used by a couple memory 75 * initialization functions, as well as show_mem() for the skipping 76 * of holes in the memory map. It is populated by arm_add_memory(). 77 */ 78 struct meminfo meminfo; 79 80 void show_mem(void) 81 { 82 int free = 0, total = 0, reserved = 0; 83 int shared = 0, cached = 0, slab = 0, i; 84 struct meminfo * mi = &meminfo; 85 86 printk("Mem-info:\n"); 87 show_free_areas(); 88 89 for_each_bank (i, mi) { 90 struct membank *bank = &mi->bank[i]; 91 unsigned int pfn1, pfn2; 92 struct page *page, *end; 93 94 pfn1 = bank_pfn_start(bank); 95 pfn2 = bank_pfn_end(bank); 96 97 page = pfn_to_page(pfn1); 98 end = pfn_to_page(pfn2 - 1) + 1; 99 100 do { 101 total++; 102 if (PageReserved(page)) 103 reserved++; 104 else if (PageSwapCache(page)) 105 cached++; 106 else if (PageSlab(page)) 107 slab++; 108 else if (!page_count(page)) 109 free++; 110 else 111 shared += page_count(page) - 1; 112 page++; 113 } while (page < end); 114 } 115 116 printk("%d pages of RAM\n", total); 117 printk("%d free pages\n", free); 118 printk("%d reserved pages\n", reserved); 119 printk("%d slab pages\n", slab); 120 printk("%d pages shared\n", shared); 121 printk("%d pages swap cached\n", cached); 122 } 123 124 static void __init find_limits(struct meminfo *mi, 125 unsigned long *min, unsigned long *max_low, unsigned long *max_high) 126 { 127 int i; 128 129 *min = -1UL; 130 *max_low = *max_high = 0; 131 132 for_each_bank (i, mi) { 133 struct membank *bank = &mi->bank[i]; 134 unsigned long start, end; 135 136 start = bank_pfn_start(bank); 137 end = bank_pfn_end(bank); 138 139 if (*min > start) 140 *min = start; 141 if (*max_high < end) 142 *max_high = end; 143 if (bank->highmem) 144 continue; 145 if (*max_low < end) 146 *max_low = end; 147 } 148 } 149 150 static void __init arm_bootmem_init(struct meminfo *mi, 151 unsigned long start_pfn, unsigned long end_pfn) 152 { 153 unsigned int boot_pages; 154 phys_addr_t bitmap; 155 pg_data_t *pgdat; 156 int i; 157 158 /* 159 * Allocate the bootmem bitmap page. This must be in a region 160 * of memory which has already been mapped. 161 */ 162 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 163 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, 164 __pfn_to_phys(end_pfn)); 165 166 /* 167 * Initialise the bootmem allocator, handing the 168 * memory banks over to bootmem. 169 */ 170 node_set_online(0); 171 pgdat = NODE_DATA(0); 172 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); 173 174 for_each_bank(i, mi) { 175 struct membank *bank = &mi->bank[i]; 176 if (!bank->highmem) 177 free_bootmem(bank_phys_start(bank), bank_phys_size(bank)); 178 } 179 180 /* 181 * Reserve the memblock reserved regions in bootmem. 182 */ 183 for (i = 0; i < memblock.reserved.cnt; i++) { 184 phys_addr_t start = memblock_start_pfn(&memblock.reserved, i); 185 if (start >= start_pfn && 186 memblock_end_pfn(&memblock.reserved, i) <= end_pfn) 187 reserve_bootmem_node(pgdat, __pfn_to_phys(start), 188 memblock_size_bytes(&memblock.reserved, i), 189 BOOTMEM_DEFAULT); 190 } 191 } 192 193 static void __init arm_bootmem_free(struct meminfo *mi) 194 { 195 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 196 unsigned long min, max_low, max_high; 197 int i; 198 199 find_limits(mi, &min, &max_low, &max_high); 200 201 /* 202 * initialise the zones. 203 */ 204 memset(zone_size, 0, sizeof(zone_size)); 205 206 /* 207 * The memory size has already been determined. If we need 208 * to do anything fancy with the allocation of this memory 209 * to the zones, now is the time to do it. 210 */ 211 zone_size[0] = max_low - min; 212 #ifdef CONFIG_HIGHMEM 213 zone_size[ZONE_HIGHMEM] = max_high - max_low; 214 #endif 215 216 /* 217 * Calculate the size of the holes. 218 * holes = node_size - sum(bank_sizes) 219 */ 220 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 221 for_each_bank(i, mi) { 222 int idx = 0; 223 #ifdef CONFIG_HIGHMEM 224 if (mi->bank[i].highmem) 225 idx = ZONE_HIGHMEM; 226 #endif 227 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]); 228 } 229 230 /* 231 * Adjust the sizes according to any special requirements for 232 * this machine type. 233 */ 234 arch_adjust_zones(zone_size, zhole_size); 235 236 free_area_init_node(0, zone_size, min, zhole_size); 237 } 238 239 #ifndef CONFIG_SPARSEMEM 240 int pfn_valid(unsigned long pfn) 241 { 242 struct meminfo *mi = &meminfo; 243 unsigned int left = 0, right = mi->nr_banks; 244 245 do { 246 unsigned int mid = (right + left) / 2; 247 struct membank *bank = &mi->bank[mid]; 248 249 if (pfn < bank_pfn_start(bank)) 250 right = mid; 251 else if (pfn >= bank_pfn_end(bank)) 252 left = mid + 1; 253 else 254 return 1; 255 } while (left < right); 256 return 0; 257 } 258 EXPORT_SYMBOL(pfn_valid); 259 260 static void arm_memory_present(struct meminfo *mi) 261 { 262 } 263 #else 264 static void arm_memory_present(struct meminfo *mi) 265 { 266 int i; 267 for_each_bank(i, mi) { 268 struct membank *bank = &mi->bank[i]; 269 memory_present(0, bank_pfn_start(bank), bank_pfn_end(bank)); 270 } 271 } 272 #endif 273 274 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) 275 { 276 int i; 277 278 memblock_init(); 279 for (i = 0; i < mi->nr_banks; i++) 280 memblock_add(mi->bank[i].start, mi->bank[i].size); 281 282 /* Register the kernel text, kernel data and initrd with memblock. */ 283 #ifdef CONFIG_XIP_KERNEL 284 memblock_reserve(__pa(_data), _end - _data); 285 #else 286 memblock_reserve(__pa(_stext), _end - _stext); 287 #endif 288 #ifdef CONFIG_BLK_DEV_INITRD 289 if (phys_initrd_size) { 290 memblock_reserve(phys_initrd_start, phys_initrd_size); 291 292 /* Now convert initrd to virtual addresses */ 293 initrd_start = __phys_to_virt(phys_initrd_start); 294 initrd_end = initrd_start + phys_initrd_size; 295 } 296 #endif 297 298 arm_mm_memblock_reserve(); 299 300 /* reserve any platform specific memblock areas */ 301 if (mdesc->reserve) 302 mdesc->reserve(); 303 304 memblock_analyze(); 305 memblock_dump_all(); 306 } 307 308 void __init bootmem_init(void) 309 { 310 struct meminfo *mi = &meminfo; 311 unsigned long min, max_low, max_high; 312 313 max_low = max_high = 0; 314 315 find_limits(mi, &min, &max_low, &max_high); 316 317 arm_bootmem_init(mi, min, max_low); 318 319 /* 320 * Sparsemem tries to allocate bootmem in memory_present(), 321 * so must be done after the fixed reservations 322 */ 323 arm_memory_present(mi); 324 325 /* 326 * sparse_init() needs the bootmem allocator up and running. 327 */ 328 sparse_init(); 329 330 /* 331 * Now free the memory - free_area_init_node needs 332 * the sparse mem_map arrays initialized by sparse_init() 333 * for memmap_init_zone(), otherwise all PFNs are invalid. 334 */ 335 arm_bootmem_free(mi); 336 337 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; 338 339 /* 340 * This doesn't seem to be used by the Linux memory manager any 341 * more, but is used by ll_rw_block. If we can get rid of it, we 342 * also get rid of some of the stuff above as well. 343 * 344 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 345 * the system, not the maximum PFN. 346 */ 347 max_low_pfn = max_low - PHYS_PFN_OFFSET; 348 max_pfn = max_high - PHYS_PFN_OFFSET; 349 } 350 351 static inline int free_area(unsigned long pfn, unsigned long end, char *s) 352 { 353 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 354 355 for (; pfn < end; pfn++) { 356 struct page *page = pfn_to_page(pfn); 357 ClearPageReserved(page); 358 init_page_count(page); 359 __free_page(page); 360 pages++; 361 } 362 363 if (size && s) 364 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 365 366 return pages; 367 } 368 369 static inline void 370 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 371 { 372 struct page *start_pg, *end_pg; 373 unsigned long pg, pgend; 374 375 /* 376 * Convert start_pfn/end_pfn to a struct page pointer. 377 */ 378 start_pg = pfn_to_page(start_pfn - 1) + 1; 379 end_pg = pfn_to_page(end_pfn); 380 381 /* 382 * Convert to physical addresses, and 383 * round start upwards and end downwards. 384 */ 385 pg = PAGE_ALIGN(__pa(start_pg)); 386 pgend = __pa(end_pg) & PAGE_MASK; 387 388 /* 389 * If there are free pages between these, 390 * free the section of the memmap array. 391 */ 392 if (pg < pgend) 393 free_bootmem(pg, pgend - pg); 394 } 395 396 /* 397 * The mem_map array can get very big. Free the unused area of the memory map. 398 */ 399 static void __init free_unused_memmap(struct meminfo *mi) 400 { 401 unsigned long bank_start, prev_bank_end = 0; 402 unsigned int i; 403 404 /* 405 * [FIXME] This relies on each bank being in address order. This 406 * may not be the case, especially if the user has provided the 407 * information on the command line. 408 */ 409 for_each_bank(i, mi) { 410 struct membank *bank = &mi->bank[i]; 411 412 bank_start = bank_pfn_start(bank); 413 if (bank_start < prev_bank_end) { 414 printk(KERN_ERR "MEM: unordered memory banks. " 415 "Not freeing memmap.\n"); 416 break; 417 } 418 419 /* 420 * If we had a previous bank, and there is a space 421 * between the current bank and the previous, free it. 422 */ 423 if (prev_bank_end && prev_bank_end != bank_start) 424 free_memmap(prev_bank_end, bank_start); 425 426 prev_bank_end = bank_pfn_end(bank); 427 } 428 } 429 430 /* 431 * mem_init() marks the free areas in the mem_map and tells us how much 432 * memory is free. This is done after various parts of the system have 433 * claimed their memory after the kernel image. 434 */ 435 void __init mem_init(void) 436 { 437 unsigned long reserved_pages, free_pages; 438 int i; 439 440 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 441 442 /* this will put all unused low memory onto the freelists */ 443 free_unused_memmap(&meminfo); 444 445 totalram_pages += free_all_bootmem(); 446 447 #ifdef CONFIG_SA1111 448 /* now that our DMA memory is actually so designated, we can free it */ 449 totalram_pages += free_area(PHYS_PFN_OFFSET, 450 __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 451 #endif 452 453 #ifdef CONFIG_HIGHMEM 454 /* set highmem page free */ 455 for_each_bank (i, &meminfo) { 456 unsigned long start = bank_pfn_start(&meminfo.bank[i]); 457 unsigned long end = bank_pfn_end(&meminfo.bank[i]); 458 if (start >= max_low_pfn + PHYS_PFN_OFFSET) 459 totalhigh_pages += free_area(start, end, NULL); 460 } 461 totalram_pages += totalhigh_pages; 462 #endif 463 464 reserved_pages = free_pages = 0; 465 466 for_each_bank(i, &meminfo) { 467 struct membank *bank = &meminfo.bank[i]; 468 unsigned int pfn1, pfn2; 469 struct page *page, *end; 470 471 pfn1 = bank_pfn_start(bank); 472 pfn2 = bank_pfn_end(bank); 473 474 page = pfn_to_page(pfn1); 475 end = pfn_to_page(pfn2 - 1) + 1; 476 477 do { 478 if (PageReserved(page)) 479 reserved_pages++; 480 else if (!page_count(page)) 481 free_pages++; 482 page++; 483 } while (page < end); 484 } 485 486 /* 487 * Since our memory may not be contiguous, calculate the 488 * real number of pages we have in this system 489 */ 490 printk(KERN_INFO "Memory:"); 491 num_physpages = 0; 492 for (i = 0; i < meminfo.nr_banks; i++) { 493 num_physpages += bank_pfn_size(&meminfo.bank[i]); 494 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); 495 } 496 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 497 498 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 499 nr_free_pages() << (PAGE_SHIFT-10), 500 free_pages << (PAGE_SHIFT-10), 501 reserved_pages << (PAGE_SHIFT-10), 502 totalhigh_pages << (PAGE_SHIFT-10)); 503 504 #define MLK(b, t) b, t, ((t) - (b)) >> 10 505 #define MLM(b, t) b, t, ((t) - (b)) >> 20 506 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 507 508 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 509 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 510 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 511 #ifdef CONFIG_MMU 512 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" 513 #endif 514 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 515 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 516 #ifdef CONFIG_HIGHMEM 517 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 518 #endif 519 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 520 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 521 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 522 " .data : 0x%p" " - 0x%p" " (%4d kB)\n", 523 524 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 525 (PAGE_SIZE)), 526 MLK(FIXADDR_START, FIXADDR_TOP), 527 #ifdef CONFIG_MMU 528 MLM(CONSISTENT_BASE, CONSISTENT_END), 529 #endif 530 MLM(VMALLOC_START, VMALLOC_END), 531 MLM(PAGE_OFFSET, (unsigned long)high_memory), 532 #ifdef CONFIG_HIGHMEM 533 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 534 (PAGE_SIZE)), 535 #endif 536 MLM(MODULES_VADDR, MODULES_END), 537 538 MLK_ROUNDUP(__init_begin, __init_end), 539 MLK_ROUNDUP(_text, _etext), 540 MLK_ROUNDUP(_data, _edata)); 541 542 #undef MLK 543 #undef MLM 544 #undef MLK_ROUNDUP 545 546 /* 547 * Check boundaries twice: Some fundamental inconsistencies can 548 * be detected at build time already. 549 */ 550 #ifdef CONFIG_MMU 551 BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); 552 BUG_ON(VMALLOC_END > CONSISTENT_BASE); 553 554 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 555 BUG_ON(TASK_SIZE > MODULES_VADDR); 556 #endif 557 558 #ifdef CONFIG_HIGHMEM 559 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 560 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 561 #endif 562 563 if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 564 extern int sysctl_overcommit_memory; 565 /* 566 * On a machine this small we won't get 567 * anywhere without overcommit, so turn 568 * it on by default. 569 */ 570 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 571 } 572 } 573 574 void free_initmem(void) 575 { 576 #ifdef CONFIG_HAVE_TCM 577 extern char __tcm_start, __tcm_end; 578 579 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 580 __phys_to_pfn(__pa(&__tcm_end)), 581 "TCM link"); 582 #endif 583 584 if (!machine_is_integrator() && !machine_is_cintegrator()) 585 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 586 __phys_to_pfn(__pa(__init_end)), 587 "init"); 588 } 589 590 #ifdef CONFIG_BLK_DEV_INITRD 591 592 static int keep_initrd; 593 594 void free_initrd_mem(unsigned long start, unsigned long end) 595 { 596 if (!keep_initrd) 597 totalram_pages += free_area(__phys_to_pfn(__pa(start)), 598 __phys_to_pfn(__pa(end)), 599 "initrd"); 600 } 601 602 static int __init keepinitrd_setup(char *__unused) 603 { 604 keep_initrd = 1; 605 return 1; 606 } 607 608 __setup("keepinitrd", keepinitrd_setup); 609 #endif 610