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 memblock_region *mem = &memblock.memory; 243 unsigned int left = 0, right = mem->cnt; 244 245 do { 246 unsigned int mid = (right + left) / 2; 247 248 if (pfn < memblock_start_pfn(mem, mid)) 249 right = mid; 250 else if (pfn >= memblock_end_pfn(mem, mid)) 251 left = mid + 1; 252 else 253 return 1; 254 } while (left < right); 255 return 0; 256 } 257 EXPORT_SYMBOL(pfn_valid); 258 259 static void arm_memory_present(void) 260 { 261 } 262 #else 263 static void arm_memory_present(void) 264 { 265 int i; 266 for (i = 0; i < memblock.memory.cnt; i++) 267 memory_present(0, memblock_start_pfn(&memblock.memory, i), 268 memblock_end_pfn(&memblock.memory, i)); 269 } 270 #endif 271 272 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) 273 { 274 int i; 275 276 memblock_init(); 277 for (i = 0; i < mi->nr_banks; i++) 278 memblock_add(mi->bank[i].start, mi->bank[i].size); 279 280 /* Register the kernel text, kernel data and initrd with memblock. */ 281 #ifdef CONFIG_XIP_KERNEL 282 memblock_reserve(__pa(_data), _end - _data); 283 #else 284 memblock_reserve(__pa(_stext), _end - _stext); 285 #endif 286 #ifdef CONFIG_BLK_DEV_INITRD 287 if (phys_initrd_size) { 288 memblock_reserve(phys_initrd_start, phys_initrd_size); 289 290 /* Now convert initrd to virtual addresses */ 291 initrd_start = __phys_to_virt(phys_initrd_start); 292 initrd_end = initrd_start + phys_initrd_size; 293 } 294 #endif 295 296 arm_mm_memblock_reserve(); 297 298 /* reserve any platform specific memblock areas */ 299 if (mdesc->reserve) 300 mdesc->reserve(); 301 302 memblock_analyze(); 303 memblock_dump_all(); 304 } 305 306 void __init bootmem_init(void) 307 { 308 struct meminfo *mi = &meminfo; 309 unsigned long min, max_low, max_high; 310 311 max_low = max_high = 0; 312 313 find_limits(mi, &min, &max_low, &max_high); 314 315 arm_bootmem_init(mi, min, max_low); 316 317 /* 318 * Sparsemem tries to allocate bootmem in memory_present(), 319 * so must be done after the fixed reservations 320 */ 321 arm_memory_present(); 322 323 /* 324 * sparse_init() needs the bootmem allocator up and running. 325 */ 326 sparse_init(); 327 328 /* 329 * Now free the memory - free_area_init_node needs 330 * the sparse mem_map arrays initialized by sparse_init() 331 * for memmap_init_zone(), otherwise all PFNs are invalid. 332 */ 333 arm_bootmem_free(mi); 334 335 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; 336 337 /* 338 * This doesn't seem to be used by the Linux memory manager any 339 * more, but is used by ll_rw_block. If we can get rid of it, we 340 * also get rid of some of the stuff above as well. 341 * 342 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 343 * the system, not the maximum PFN. 344 */ 345 max_low_pfn = max_low - PHYS_PFN_OFFSET; 346 max_pfn = max_high - PHYS_PFN_OFFSET; 347 } 348 349 static inline int free_area(unsigned long pfn, unsigned long end, char *s) 350 { 351 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 352 353 for (; pfn < end; pfn++) { 354 struct page *page = pfn_to_page(pfn); 355 ClearPageReserved(page); 356 init_page_count(page); 357 __free_page(page); 358 pages++; 359 } 360 361 if (size && s) 362 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 363 364 return pages; 365 } 366 367 static inline void 368 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 369 { 370 struct page *start_pg, *end_pg; 371 unsigned long pg, pgend; 372 373 /* 374 * Convert start_pfn/end_pfn to a struct page pointer. 375 */ 376 start_pg = pfn_to_page(start_pfn - 1) + 1; 377 end_pg = pfn_to_page(end_pfn); 378 379 /* 380 * Convert to physical addresses, and 381 * round start upwards and end downwards. 382 */ 383 pg = PAGE_ALIGN(__pa(start_pg)); 384 pgend = __pa(end_pg) & PAGE_MASK; 385 386 /* 387 * If there are free pages between these, 388 * free the section of the memmap array. 389 */ 390 if (pg < pgend) 391 free_bootmem(pg, pgend - pg); 392 } 393 394 /* 395 * The mem_map array can get very big. Free the unused area of the memory map. 396 */ 397 static void __init free_unused_memmap(struct meminfo *mi) 398 { 399 unsigned long bank_start, prev_bank_end = 0; 400 unsigned int i; 401 402 /* 403 * [FIXME] This relies on each bank being in address order. This 404 * may not be the case, especially if the user has provided the 405 * information on the command line. 406 */ 407 for_each_bank(i, mi) { 408 struct membank *bank = &mi->bank[i]; 409 410 bank_start = bank_pfn_start(bank); 411 if (bank_start < prev_bank_end) { 412 printk(KERN_ERR "MEM: unordered memory banks. " 413 "Not freeing memmap.\n"); 414 break; 415 } 416 417 /* 418 * If we had a previous bank, and there is a space 419 * between the current bank and the previous, free it. 420 */ 421 if (prev_bank_end && prev_bank_end != bank_start) 422 free_memmap(prev_bank_end, bank_start); 423 424 prev_bank_end = bank_pfn_end(bank); 425 } 426 } 427 428 /* 429 * mem_init() marks the free areas in the mem_map and tells us how much 430 * memory is free. This is done after various parts of the system have 431 * claimed their memory after the kernel image. 432 */ 433 void __init mem_init(void) 434 { 435 unsigned long reserved_pages, free_pages; 436 int i; 437 438 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 439 440 /* this will put all unused low memory onto the freelists */ 441 free_unused_memmap(&meminfo); 442 443 totalram_pages += free_all_bootmem(); 444 445 #ifdef CONFIG_SA1111 446 /* now that our DMA memory is actually so designated, we can free it */ 447 totalram_pages += free_area(PHYS_PFN_OFFSET, 448 __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 449 #endif 450 451 #ifdef CONFIG_HIGHMEM 452 /* set highmem page free */ 453 for_each_bank (i, &meminfo) { 454 unsigned long start = bank_pfn_start(&meminfo.bank[i]); 455 unsigned long end = bank_pfn_end(&meminfo.bank[i]); 456 if (start >= max_low_pfn + PHYS_PFN_OFFSET) 457 totalhigh_pages += free_area(start, end, NULL); 458 } 459 totalram_pages += totalhigh_pages; 460 #endif 461 462 reserved_pages = free_pages = 0; 463 464 for_each_bank(i, &meminfo) { 465 struct membank *bank = &meminfo.bank[i]; 466 unsigned int pfn1, pfn2; 467 struct page *page, *end; 468 469 pfn1 = bank_pfn_start(bank); 470 pfn2 = bank_pfn_end(bank); 471 472 page = pfn_to_page(pfn1); 473 end = pfn_to_page(pfn2 - 1) + 1; 474 475 do { 476 if (PageReserved(page)) 477 reserved_pages++; 478 else if (!page_count(page)) 479 free_pages++; 480 page++; 481 } while (page < end); 482 } 483 484 /* 485 * Since our memory may not be contiguous, calculate the 486 * real number of pages we have in this system 487 */ 488 printk(KERN_INFO "Memory:"); 489 num_physpages = 0; 490 for (i = 0; i < meminfo.nr_banks; i++) { 491 num_physpages += bank_pfn_size(&meminfo.bank[i]); 492 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); 493 } 494 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 495 496 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 497 nr_free_pages() << (PAGE_SHIFT-10), 498 free_pages << (PAGE_SHIFT-10), 499 reserved_pages << (PAGE_SHIFT-10), 500 totalhigh_pages << (PAGE_SHIFT-10)); 501 502 #define MLK(b, t) b, t, ((t) - (b)) >> 10 503 #define MLM(b, t) b, t, ((t) - (b)) >> 20 504 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 505 506 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 507 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 508 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 509 #ifdef CONFIG_MMU 510 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" 511 #endif 512 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 513 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 514 #ifdef CONFIG_HIGHMEM 515 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 516 #endif 517 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 518 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 519 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 520 " .data : 0x%p" " - 0x%p" " (%4d kB)\n", 521 522 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 523 (PAGE_SIZE)), 524 MLK(FIXADDR_START, FIXADDR_TOP), 525 #ifdef CONFIG_MMU 526 MLM(CONSISTENT_BASE, CONSISTENT_END), 527 #endif 528 MLM(VMALLOC_START, VMALLOC_END), 529 MLM(PAGE_OFFSET, (unsigned long)high_memory), 530 #ifdef CONFIG_HIGHMEM 531 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 532 (PAGE_SIZE)), 533 #endif 534 MLM(MODULES_VADDR, MODULES_END), 535 536 MLK_ROUNDUP(__init_begin, __init_end), 537 MLK_ROUNDUP(_text, _etext), 538 MLK_ROUNDUP(_data, _edata)); 539 540 #undef MLK 541 #undef MLM 542 #undef MLK_ROUNDUP 543 544 /* 545 * Check boundaries twice: Some fundamental inconsistencies can 546 * be detected at build time already. 547 */ 548 #ifdef CONFIG_MMU 549 BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); 550 BUG_ON(VMALLOC_END > CONSISTENT_BASE); 551 552 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 553 BUG_ON(TASK_SIZE > MODULES_VADDR); 554 #endif 555 556 #ifdef CONFIG_HIGHMEM 557 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 558 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 559 #endif 560 561 if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 562 extern int sysctl_overcommit_memory; 563 /* 564 * On a machine this small we won't get 565 * anywhere without overcommit, so turn 566 * it on by default. 567 */ 568 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 569 } 570 } 571 572 void free_initmem(void) 573 { 574 #ifdef CONFIG_HAVE_TCM 575 extern char __tcm_start, __tcm_end; 576 577 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 578 __phys_to_pfn(__pa(&__tcm_end)), 579 "TCM link"); 580 #endif 581 582 if (!machine_is_integrator() && !machine_is_cintegrator()) 583 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 584 __phys_to_pfn(__pa(__init_end)), 585 "init"); 586 } 587 588 #ifdef CONFIG_BLK_DEV_INITRD 589 590 static int keep_initrd; 591 592 void free_initrd_mem(unsigned long start, unsigned long end) 593 { 594 if (!keep_initrd) 595 totalram_pages += free_area(__phys_to_pfn(__pa(start)), 596 __phys_to_pfn(__pa(end)), 597 "initrd"); 598 } 599 600 static int __init keepinitrd_setup(char *__unused) 601 { 602 keep_initrd = 1; 603 return 1; 604 } 605 606 __setup("keepinitrd", keepinitrd_setup); 607 #endif 608