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_reserved_base_pfn(reg); 186 phys_addr_t end = memblock_region_reserved_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; 252 253 for_each_memblock(memory, reg) 254 memory_present(0, memblock_region_memory_base_pfn(reg), 255 memblock_region_memory_end_pfn(reg)); 256 } 257 #endif 258 259 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) 260 { 261 int i; 262 263 memblock_init(); 264 for (i = 0; i < mi->nr_banks; i++) 265 memblock_add(mi->bank[i].start, mi->bank[i].size); 266 267 /* Register the kernel text, kernel data and initrd with memblock. */ 268 #ifdef CONFIG_XIP_KERNEL 269 memblock_reserve(__pa(_data), _end - _data); 270 #else 271 memblock_reserve(__pa(_stext), _end - _stext); 272 #endif 273 #ifdef CONFIG_BLK_DEV_INITRD 274 if (phys_initrd_size) { 275 memblock_reserve(phys_initrd_start, phys_initrd_size); 276 277 /* Now convert initrd to virtual addresses */ 278 initrd_start = __phys_to_virt(phys_initrd_start); 279 initrd_end = initrd_start + phys_initrd_size; 280 } 281 #endif 282 283 arm_mm_memblock_reserve(); 284 285 /* reserve any platform specific memblock areas */ 286 if (mdesc->reserve) 287 mdesc->reserve(); 288 289 memblock_analyze(); 290 memblock_dump_all(); 291 } 292 293 void __init bootmem_init(void) 294 { 295 struct meminfo *mi = &meminfo; 296 unsigned long min, max_low, max_high; 297 298 max_low = max_high = 0; 299 300 find_limits(mi, &min, &max_low, &max_high); 301 302 arm_bootmem_init(mi, min, max_low); 303 304 /* 305 * Sparsemem tries to allocate bootmem in memory_present(), 306 * so must be done after the fixed reservations 307 */ 308 arm_memory_present(); 309 310 /* 311 * sparse_init() needs the bootmem allocator up and running. 312 */ 313 sparse_init(); 314 315 /* 316 * Now free the memory - free_area_init_node needs 317 * the sparse mem_map arrays initialized by sparse_init() 318 * for memmap_init_zone(), otherwise all PFNs are invalid. 319 */ 320 arm_bootmem_free(mi, min, max_low, max_high); 321 322 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; 323 324 /* 325 * This doesn't seem to be used by the Linux memory manager any 326 * more, but is used by ll_rw_block. If we can get rid of it, we 327 * also get rid of some of the stuff above as well. 328 * 329 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 330 * the system, not the maximum PFN. 331 */ 332 max_low_pfn = max_low - PHYS_PFN_OFFSET; 333 max_pfn = max_high - PHYS_PFN_OFFSET; 334 } 335 336 static inline int free_area(unsigned long pfn, unsigned long end, char *s) 337 { 338 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 339 340 for (; pfn < end; pfn++) { 341 struct page *page = pfn_to_page(pfn); 342 ClearPageReserved(page); 343 init_page_count(page); 344 __free_page(page); 345 pages++; 346 } 347 348 if (size && s) 349 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 350 351 return pages; 352 } 353 354 static inline void 355 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 356 { 357 struct page *start_pg, *end_pg; 358 unsigned long pg, pgend; 359 360 /* 361 * Convert start_pfn/end_pfn to a struct page pointer. 362 */ 363 start_pg = pfn_to_page(start_pfn - 1) + 1; 364 end_pg = pfn_to_page(end_pfn); 365 366 /* 367 * Convert to physical addresses, and 368 * round start upwards and end downwards. 369 */ 370 pg = PAGE_ALIGN(__pa(start_pg)); 371 pgend = __pa(end_pg) & PAGE_MASK; 372 373 /* 374 * If there are free pages between these, 375 * free the section of the memmap array. 376 */ 377 if (pg < pgend) 378 free_bootmem(pg, pgend - pg); 379 } 380 381 /* 382 * The mem_map array can get very big. Free the unused area of the memory map. 383 */ 384 static void __init free_unused_memmap(struct meminfo *mi) 385 { 386 unsigned long bank_start, prev_bank_end = 0; 387 unsigned int i; 388 389 /* 390 * This relies on each bank being in address order. 391 * The banks are sorted previously in bootmem_init(). 392 */ 393 for_each_bank(i, mi) { 394 struct membank *bank = &mi->bank[i]; 395 396 bank_start = bank_pfn_start(bank); 397 398 /* 399 * If we had a previous bank, and there is a space 400 * between the current bank and the previous, free it. 401 */ 402 if (prev_bank_end && prev_bank_end < bank_start) 403 free_memmap(prev_bank_end, bank_start); 404 405 /* 406 * Align up here since the VM subsystem insists that the 407 * memmap entries are valid from the bank end aligned to 408 * MAX_ORDER_NR_PAGES. 409 */ 410 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 411 } 412 } 413 414 /* 415 * mem_init() marks the free areas in the mem_map and tells us how much 416 * memory is free. This is done after various parts of the system have 417 * claimed their memory after the kernel image. 418 */ 419 void __init mem_init(void) 420 { 421 unsigned long reserved_pages, free_pages; 422 int i; 423 #ifdef CONFIG_HAVE_TCM 424 /* These pointers are filled in on TCM detection */ 425 extern u32 dtcm_end; 426 extern u32 itcm_end; 427 #endif 428 429 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 430 431 /* this will put all unused low memory onto the freelists */ 432 free_unused_memmap(&meminfo); 433 434 totalram_pages += free_all_bootmem(); 435 436 #ifdef CONFIG_SA1111 437 /* now that our DMA memory is actually so designated, we can free it */ 438 totalram_pages += free_area(PHYS_PFN_OFFSET, 439 __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 440 #endif 441 442 #ifdef CONFIG_HIGHMEM 443 /* set highmem page free */ 444 for_each_bank (i, &meminfo) { 445 unsigned long start = bank_pfn_start(&meminfo.bank[i]); 446 unsigned long end = bank_pfn_end(&meminfo.bank[i]); 447 if (start >= max_low_pfn + PHYS_PFN_OFFSET) 448 totalhigh_pages += free_area(start, end, NULL); 449 } 450 totalram_pages += totalhigh_pages; 451 #endif 452 453 reserved_pages = free_pages = 0; 454 455 for_each_bank(i, &meminfo) { 456 struct membank *bank = &meminfo.bank[i]; 457 unsigned int pfn1, pfn2; 458 struct page *page, *end; 459 460 pfn1 = bank_pfn_start(bank); 461 pfn2 = bank_pfn_end(bank); 462 463 page = pfn_to_page(pfn1); 464 end = pfn_to_page(pfn2 - 1) + 1; 465 466 do { 467 if (PageReserved(page)) 468 reserved_pages++; 469 else if (!page_count(page)) 470 free_pages++; 471 page++; 472 } while (page < end); 473 } 474 475 /* 476 * Since our memory may not be contiguous, calculate the 477 * real number of pages we have in this system 478 */ 479 printk(KERN_INFO "Memory:"); 480 num_physpages = 0; 481 for (i = 0; i < meminfo.nr_banks; i++) { 482 num_physpages += bank_pfn_size(&meminfo.bank[i]); 483 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); 484 } 485 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 486 487 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 488 nr_free_pages() << (PAGE_SHIFT-10), 489 free_pages << (PAGE_SHIFT-10), 490 reserved_pages << (PAGE_SHIFT-10), 491 totalhigh_pages << (PAGE_SHIFT-10)); 492 493 #define MLK(b, t) b, t, ((t) - (b)) >> 10 494 #define MLM(b, t) b, t, ((t) - (b)) >> 20 495 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 496 497 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 498 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 499 #ifdef CONFIG_HAVE_TCM 500 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 501 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 502 #endif 503 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 504 #ifdef CONFIG_MMU 505 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" 506 #endif 507 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 508 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 509 #ifdef CONFIG_HIGHMEM 510 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 511 #endif 512 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 513 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 514 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 515 " .data : 0x%p" " - 0x%p" " (%4d kB)\n", 516 517 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 518 (PAGE_SIZE)), 519 #ifdef CONFIG_HAVE_TCM 520 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 521 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 522 #endif 523 MLK(FIXADDR_START, FIXADDR_TOP), 524 #ifdef CONFIG_MMU 525 MLM(CONSISTENT_BASE, CONSISTENT_END), 526 #endif 527 MLM(VMALLOC_START, VMALLOC_END), 528 MLM(PAGE_OFFSET, (unsigned long)high_memory), 529 #ifdef CONFIG_HIGHMEM 530 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 531 (PAGE_SIZE)), 532 #endif 533 MLM(MODULES_VADDR, MODULES_END), 534 535 MLK_ROUNDUP(__init_begin, __init_end), 536 MLK_ROUNDUP(_text, _etext), 537 MLK_ROUNDUP(_data, _edata)); 538 539 #undef MLK 540 #undef MLM 541 #undef MLK_ROUNDUP 542 543 /* 544 * Check boundaries twice: Some fundamental inconsistencies can 545 * be detected at build time already. 546 */ 547 #ifdef CONFIG_MMU 548 BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); 549 BUG_ON(VMALLOC_END > CONSISTENT_BASE); 550 551 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 552 BUG_ON(TASK_SIZE > MODULES_VADDR); 553 #endif 554 555 #ifdef CONFIG_HIGHMEM 556 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 557 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 558 #endif 559 560 if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 561 extern int sysctl_overcommit_memory; 562 /* 563 * On a machine this small we won't get 564 * anywhere without overcommit, so turn 565 * it on by default. 566 */ 567 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 568 } 569 } 570 571 void free_initmem(void) 572 { 573 #ifdef CONFIG_HAVE_TCM 574 extern char __tcm_start, __tcm_end; 575 576 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 577 __phys_to_pfn(__pa(&__tcm_end)), 578 "TCM link"); 579 #endif 580 581 if (!machine_is_integrator() && !machine_is_cintegrator()) 582 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 583 __phys_to_pfn(__pa(__init_end)), 584 "init"); 585 } 586 587 #ifdef CONFIG_BLK_DEV_INITRD 588 589 static int keep_initrd; 590 591 void free_initrd_mem(unsigned long start, unsigned long end) 592 { 593 if (!keep_initrd) 594 totalram_pages += free_area(__phys_to_pfn(__pa(start)), 595 __phys_to_pfn(__pa(end)), 596 "initrd"); 597 } 598 599 static int __init keepinitrd_setup(char *__unused) 600 { 601 keep_initrd = 1; 602 return 1; 603 } 604 605 __setup("keepinitrd", keepinitrd_setup); 606 #endif 607