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 struct memblock_region *reg; 154 unsigned int boot_pages; 155 phys_addr_t bitmap; 156 pg_data_t *pgdat; 157 int i; 158 159 /* 160 * Allocate the bootmem bitmap page. This must be in a region 161 * of memory which has already been mapped. 162 */ 163 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 164 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, 165 __pfn_to_phys(end_pfn)); 166 167 /* 168 * Initialise the bootmem allocator, handing the 169 * memory banks over to bootmem. 170 */ 171 node_set_online(0); 172 pgdat = NODE_DATA(0); 173 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); 174 175 for_each_bank(i, mi) { 176 struct membank *bank = &mi->bank[i]; 177 if (!bank->highmem) 178 free_bootmem(bank_phys_start(bank), bank_phys_size(bank)); 179 } 180 181 /* 182 * Reserve the memblock reserved regions in bootmem. 183 */ 184 for_each_memblock(reserved, reg) { 185 phys_addr_t start = memblock_region_base_pfn(reg); 186 phys_addr_t end = memblock_region_end_pfn(reg); 187 if (start >= start_pfn && end <= end_pfn) 188 reserve_bootmem_node(pgdat, __pfn_to_phys(start), 189 (end - start) << PAGE_SHIFT, 190 BOOTMEM_DEFAULT); 191 } 192 } 193 194 static void __init arm_bootmem_free(struct meminfo *mi, unsigned long min, 195 unsigned long max_low, unsigned long max_high) 196 { 197 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 198 int i; 199 200 /* 201 * initialise the zones. 202 */ 203 memset(zone_size, 0, sizeof(zone_size)); 204 205 /* 206 * The memory size has already been determined. If we need 207 * to do anything fancy with the allocation of this memory 208 * to the zones, now is the time to do it. 209 */ 210 zone_size[0] = max_low - min; 211 #ifdef CONFIG_HIGHMEM 212 zone_size[ZONE_HIGHMEM] = max_high - max_low; 213 #endif 214 215 /* 216 * Calculate the size of the holes. 217 * holes = node_size - sum(bank_sizes) 218 */ 219 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 220 for_each_bank(i, mi) { 221 int idx = 0; 222 #ifdef CONFIG_HIGHMEM 223 if (mi->bank[i].highmem) 224 idx = ZONE_HIGHMEM; 225 #endif 226 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]); 227 } 228 229 /* 230 * Adjust the sizes according to any special requirements for 231 * this machine type. 232 */ 233 arch_adjust_zones(zone_size, zhole_size); 234 235 free_area_init_node(0, zone_size, min, zhole_size); 236 } 237 238 #ifndef CONFIG_SPARSEMEM 239 int pfn_valid(unsigned long pfn) 240 { 241 return memblock_is_memory(pfn << PAGE_SHIFT); 242 } 243 EXPORT_SYMBOL(pfn_valid); 244 245 static void arm_memory_present(void) 246 { 247 } 248 #else 249 static void arm_memory_present(void) 250 { 251 struct memblock_region *reg; 252 int i; 253 254 for_each_memblock(memory, reg) { 255 memory_present(0, memblock_region_base_pfn(reg), 256 memblock_region_end_pfn(reg)); 257 } 258 #endif 259 260 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) 261 { 262 int i; 263 264 memblock_init(); 265 for (i = 0; i < mi->nr_banks; i++) 266 memblock_add(mi->bank[i].start, mi->bank[i].size); 267 268 /* Register the kernel text, kernel data and initrd with memblock. */ 269 #ifdef CONFIG_XIP_KERNEL 270 memblock_reserve(__pa(_data), _end - _data); 271 #else 272 memblock_reserve(__pa(_stext), _end - _stext); 273 #endif 274 #ifdef CONFIG_BLK_DEV_INITRD 275 if (phys_initrd_size) { 276 memblock_reserve(phys_initrd_start, phys_initrd_size); 277 278 /* Now convert initrd to virtual addresses */ 279 initrd_start = __phys_to_virt(phys_initrd_start); 280 initrd_end = initrd_start + phys_initrd_size; 281 } 282 #endif 283 284 arm_mm_memblock_reserve(); 285 286 /* reserve any platform specific memblock areas */ 287 if (mdesc->reserve) 288 mdesc->reserve(); 289 290 memblock_analyze(); 291 memblock_dump_all(); 292 } 293 294 void __init bootmem_init(void) 295 { 296 struct meminfo *mi = &meminfo; 297 unsigned long min, max_low, max_high; 298 299 max_low = max_high = 0; 300 301 find_limits(mi, &min, &max_low, &max_high); 302 303 arm_bootmem_init(mi, min, max_low); 304 305 /* 306 * Sparsemem tries to allocate bootmem in memory_present(), 307 * so must be done after the fixed reservations 308 */ 309 arm_memory_present(); 310 311 /* 312 * sparse_init() needs the bootmem allocator up and running. 313 */ 314 sparse_init(); 315 316 /* 317 * Now free the memory - free_area_init_node needs 318 * the sparse mem_map arrays initialized by sparse_init() 319 * for memmap_init_zone(), otherwise all PFNs are invalid. 320 */ 321 arm_bootmem_free(mi, min, max_low, max_high); 322 323 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; 324 325 /* 326 * This doesn't seem to be used by the Linux memory manager any 327 * more, but is used by ll_rw_block. If we can get rid of it, we 328 * also get rid of some of the stuff above as well. 329 * 330 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 331 * the system, not the maximum PFN. 332 */ 333 max_low_pfn = max_low - PHYS_PFN_OFFSET; 334 max_pfn = max_high - PHYS_PFN_OFFSET; 335 } 336 337 static inline int free_area(unsigned long pfn, unsigned long end, char *s) 338 { 339 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 340 341 for (; pfn < end; pfn++) { 342 struct page *page = pfn_to_page(pfn); 343 ClearPageReserved(page); 344 init_page_count(page); 345 __free_page(page); 346 pages++; 347 } 348 349 if (size && s) 350 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 351 352 return pages; 353 } 354 355 static inline void 356 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 357 { 358 struct page *start_pg, *end_pg; 359 unsigned long pg, pgend; 360 361 /* 362 * Convert start_pfn/end_pfn to a struct page pointer. 363 */ 364 start_pg = pfn_to_page(start_pfn - 1) + 1; 365 end_pg = pfn_to_page(end_pfn); 366 367 /* 368 * Convert to physical addresses, and 369 * round start upwards and end downwards. 370 */ 371 pg = PAGE_ALIGN(__pa(start_pg)); 372 pgend = __pa(end_pg) & PAGE_MASK; 373 374 /* 375 * If there are free pages between these, 376 * free the section of the memmap array. 377 */ 378 if (pg < pgend) 379 free_bootmem(pg, pgend - pg); 380 } 381 382 /* 383 * The mem_map array can get very big. Free the unused area of the memory map. 384 */ 385 static void __init free_unused_memmap(struct meminfo *mi) 386 { 387 unsigned long bank_start, prev_bank_end = 0; 388 unsigned int i; 389 390 /* 391 * This relies on each bank being in address order. 392 * The banks are sorted previously in bootmem_init(). 393 */ 394 for_each_bank(i, mi) { 395 struct membank *bank = &mi->bank[i]; 396 397 bank_start = bank_pfn_start(bank); 398 399 /* 400 * If we had a previous bank, and there is a space 401 * between the current bank and the previous, free it. 402 */ 403 if (prev_bank_end && prev_bank_end < bank_start) 404 free_memmap(prev_bank_end, bank_start); 405 406 /* 407 * Align up here since the VM subsystem insists that the 408 * memmap entries are valid from the bank end aligned to 409 * MAX_ORDER_NR_PAGES. 410 */ 411 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 412 } 413 } 414 415 /* 416 * mem_init() marks the free areas in the mem_map and tells us how much 417 * memory is free. This is done after various parts of the system have 418 * claimed their memory after the kernel image. 419 */ 420 void __init mem_init(void) 421 { 422 unsigned long reserved_pages, free_pages; 423 int i; 424 #ifdef CONFIG_HAVE_TCM 425 /* These pointers are filled in on TCM detection */ 426 extern u32 dtcm_end; 427 extern u32 itcm_end; 428 #endif 429 430 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 431 432 /* this will put all unused low memory onto the freelists */ 433 free_unused_memmap(&meminfo); 434 435 totalram_pages += free_all_bootmem(); 436 437 #ifdef CONFIG_SA1111 438 /* now that our DMA memory is actually so designated, we can free it */ 439 totalram_pages += free_area(PHYS_PFN_OFFSET, 440 __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 441 #endif 442 443 #ifdef CONFIG_HIGHMEM 444 /* set highmem page free */ 445 for_each_bank (i, &meminfo) { 446 unsigned long start = bank_pfn_start(&meminfo.bank[i]); 447 unsigned long end = bank_pfn_end(&meminfo.bank[i]); 448 if (start >= max_low_pfn + PHYS_PFN_OFFSET) 449 totalhigh_pages += free_area(start, end, NULL); 450 } 451 totalram_pages += totalhigh_pages; 452 #endif 453 454 reserved_pages = free_pages = 0; 455 456 for_each_bank(i, &meminfo) { 457 struct membank *bank = &meminfo.bank[i]; 458 unsigned int pfn1, pfn2; 459 struct page *page, *end; 460 461 pfn1 = bank_pfn_start(bank); 462 pfn2 = bank_pfn_end(bank); 463 464 page = pfn_to_page(pfn1); 465 end = pfn_to_page(pfn2 - 1) + 1; 466 467 do { 468 if (PageReserved(page)) 469 reserved_pages++; 470 else if (!page_count(page)) 471 free_pages++; 472 page++; 473 } while (page < end); 474 } 475 476 /* 477 * Since our memory may not be contiguous, calculate the 478 * real number of pages we have in this system 479 */ 480 printk(KERN_INFO "Memory:"); 481 num_physpages = 0; 482 for (i = 0; i < meminfo.nr_banks; i++) { 483 num_physpages += bank_pfn_size(&meminfo.bank[i]); 484 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); 485 } 486 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 487 488 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 489 nr_free_pages() << (PAGE_SHIFT-10), 490 free_pages << (PAGE_SHIFT-10), 491 reserved_pages << (PAGE_SHIFT-10), 492 totalhigh_pages << (PAGE_SHIFT-10)); 493 494 #define MLK(b, t) b, t, ((t) - (b)) >> 10 495 #define MLM(b, t) b, t, ((t) - (b)) >> 20 496 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 497 498 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 499 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 500 #ifdef CONFIG_HAVE_TCM 501 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 502 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 503 #endif 504 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 505 #ifdef CONFIG_MMU 506 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" 507 #endif 508 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 509 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 510 #ifdef CONFIG_HIGHMEM 511 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 512 #endif 513 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 514 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 515 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 516 " .data : 0x%p" " - 0x%p" " (%4d kB)\n", 517 518 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 519 (PAGE_SIZE)), 520 #ifdef CONFIG_HAVE_TCM 521 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 522 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 523 #endif 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