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/export.h> 17 #include <linux/nodemask.h> 18 #include <linux/initrd.h> 19 #include <linux/of_fdt.h> 20 #include <linux/highmem.h> 21 #include <linux/gfp.h> 22 #include <linux/memblock.h> 23 #include <linux/dma-contiguous.h> 24 #include <linux/sizes.h> 25 26 #include <asm/mach-types.h> 27 #include <asm/memblock.h> 28 #include <asm/prom.h> 29 #include <asm/sections.h> 30 #include <asm/setup.h> 31 #include <asm/tlb.h> 32 #include <asm/fixmap.h> 33 34 #include <asm/mach/arch.h> 35 #include <asm/mach/map.h> 36 37 #include "mm.h" 38 39 static unsigned long phys_initrd_start __initdata = 0; 40 static unsigned long phys_initrd_size __initdata = 0; 41 42 static int __init early_initrd(char *p) 43 { 44 unsigned long start, size; 45 char *endp; 46 47 start = memparse(p, &endp); 48 if (*endp == ',') { 49 size = memparse(endp + 1, NULL); 50 51 phys_initrd_start = start; 52 phys_initrd_size = size; 53 } 54 return 0; 55 } 56 early_param("initrd", early_initrd); 57 58 static int __init parse_tag_initrd(const struct tag *tag) 59 { 60 printk(KERN_WARNING "ATAG_INITRD is deprecated; " 61 "please update your bootloader.\n"); 62 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 63 phys_initrd_size = tag->u.initrd.size; 64 return 0; 65 } 66 67 __tagtable(ATAG_INITRD, parse_tag_initrd); 68 69 static int __init parse_tag_initrd2(const struct tag *tag) 70 { 71 phys_initrd_start = tag->u.initrd.start; 72 phys_initrd_size = tag->u.initrd.size; 73 return 0; 74 } 75 76 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 77 78 #ifdef CONFIG_OF_FLATTREE 79 void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end) 80 { 81 phys_initrd_start = start; 82 phys_initrd_size = end - start; 83 } 84 #endif /* CONFIG_OF_FLATTREE */ 85 86 /* 87 * This keeps memory configuration data used by a couple memory 88 * initialization functions, as well as show_mem() for the skipping 89 * of holes in the memory map. It is populated by arm_add_memory(). 90 */ 91 struct meminfo meminfo; 92 93 void show_mem(unsigned int filter) 94 { 95 int free = 0, total = 0, reserved = 0; 96 int shared = 0, cached = 0, slab = 0, i; 97 struct meminfo * mi = &meminfo; 98 99 printk("Mem-info:\n"); 100 show_free_areas(filter); 101 102 for_each_bank (i, mi) { 103 struct membank *bank = &mi->bank[i]; 104 unsigned int pfn1, pfn2; 105 struct page *page, *end; 106 107 pfn1 = bank_pfn_start(bank); 108 pfn2 = bank_pfn_end(bank); 109 110 page = pfn_to_page(pfn1); 111 end = pfn_to_page(pfn2 - 1) + 1; 112 113 do { 114 total++; 115 if (PageReserved(page)) 116 reserved++; 117 else if (PageSwapCache(page)) 118 cached++; 119 else if (PageSlab(page)) 120 slab++; 121 else if (!page_count(page)) 122 free++; 123 else 124 shared += page_count(page) - 1; 125 page++; 126 } while (page < end); 127 } 128 129 printk("%d pages of RAM\n", total); 130 printk("%d free pages\n", free); 131 printk("%d reserved pages\n", reserved); 132 printk("%d slab pages\n", slab); 133 printk("%d pages shared\n", shared); 134 printk("%d pages swap cached\n", cached); 135 } 136 137 static void __init find_limits(unsigned long *min, unsigned long *max_low, 138 unsigned long *max_high) 139 { 140 struct meminfo *mi = &meminfo; 141 int i; 142 143 /* This assumes the meminfo array is properly sorted */ 144 *min = bank_pfn_start(&mi->bank[0]); 145 for_each_bank (i, mi) 146 if (mi->bank[i].highmem) 147 break; 148 *max_low = bank_pfn_end(&mi->bank[i - 1]); 149 *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]); 150 } 151 152 static void __init arm_bootmem_init(unsigned long start_pfn, 153 unsigned long end_pfn) 154 { 155 struct memblock_region *reg; 156 unsigned int boot_pages; 157 phys_addr_t bitmap; 158 pg_data_t *pgdat; 159 160 /* 161 * Allocate the bootmem bitmap page. This must be in a region 162 * of memory which has already been mapped. 163 */ 164 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 165 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, 166 __pfn_to_phys(end_pfn)); 167 168 /* 169 * Initialise the bootmem allocator, handing the 170 * memory banks over to bootmem. 171 */ 172 node_set_online(0); 173 pgdat = NODE_DATA(0); 174 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); 175 176 /* Free the lowmem regions from memblock into bootmem. */ 177 for_each_memblock(memory, reg) { 178 unsigned long start = memblock_region_memory_base_pfn(reg); 179 unsigned long end = memblock_region_memory_end_pfn(reg); 180 181 if (end >= end_pfn) 182 end = end_pfn; 183 if (start >= end) 184 break; 185 186 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); 187 } 188 189 /* Reserve the lowmem memblock reserved regions in bootmem. */ 190 for_each_memblock(reserved, reg) { 191 unsigned long start = memblock_region_reserved_base_pfn(reg); 192 unsigned long end = memblock_region_reserved_end_pfn(reg); 193 194 if (end >= end_pfn) 195 end = end_pfn; 196 if (start >= end) 197 break; 198 199 reserve_bootmem(__pfn_to_phys(start), 200 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); 201 } 202 } 203 204 #ifdef CONFIG_ZONE_DMA 205 206 unsigned long arm_dma_zone_size __read_mostly; 207 EXPORT_SYMBOL(arm_dma_zone_size); 208 209 /* 210 * The DMA mask corresponding to the maximum bus address allocatable 211 * using GFP_DMA. The default here places no restriction on DMA 212 * allocations. This must be the smallest DMA mask in the system, 213 * so a successful GFP_DMA allocation will always satisfy this. 214 */ 215 phys_addr_t arm_dma_limit; 216 217 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 218 unsigned long dma_size) 219 { 220 if (size[0] <= dma_size) 221 return; 222 223 size[ZONE_NORMAL] = size[0] - dma_size; 224 size[ZONE_DMA] = dma_size; 225 hole[ZONE_NORMAL] = hole[0]; 226 hole[ZONE_DMA] = 0; 227 } 228 #endif 229 230 void __init setup_dma_zone(struct machine_desc *mdesc) 231 { 232 #ifdef CONFIG_ZONE_DMA 233 if (mdesc->dma_zone_size) { 234 arm_dma_zone_size = mdesc->dma_zone_size; 235 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; 236 } else 237 arm_dma_limit = 0xffffffff; 238 #endif 239 } 240 241 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, 242 unsigned long max_high) 243 { 244 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 245 struct memblock_region *reg; 246 247 /* 248 * initialise the zones. 249 */ 250 memset(zone_size, 0, sizeof(zone_size)); 251 252 /* 253 * The memory size has already been determined. If we need 254 * to do anything fancy with the allocation of this memory 255 * to the zones, now is the time to do it. 256 */ 257 zone_size[0] = max_low - min; 258 #ifdef CONFIG_HIGHMEM 259 zone_size[ZONE_HIGHMEM] = max_high - max_low; 260 #endif 261 262 /* 263 * Calculate the size of the holes. 264 * holes = node_size - sum(bank_sizes) 265 */ 266 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 267 for_each_memblock(memory, reg) { 268 unsigned long start = memblock_region_memory_base_pfn(reg); 269 unsigned long end = memblock_region_memory_end_pfn(reg); 270 271 if (start < max_low) { 272 unsigned long low_end = min(end, max_low); 273 zhole_size[0] -= low_end - start; 274 } 275 #ifdef CONFIG_HIGHMEM 276 if (end > max_low) { 277 unsigned long high_start = max(start, max_low); 278 zhole_size[ZONE_HIGHMEM] -= end - high_start; 279 } 280 #endif 281 } 282 283 #ifdef CONFIG_ZONE_DMA 284 /* 285 * Adjust the sizes according to any special requirements for 286 * this machine type. 287 */ 288 if (arm_dma_zone_size) 289 arm_adjust_dma_zone(zone_size, zhole_size, 290 arm_dma_zone_size >> PAGE_SHIFT); 291 #endif 292 293 free_area_init_node(0, zone_size, min, zhole_size); 294 } 295 296 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 297 int pfn_valid(unsigned long pfn) 298 { 299 return memblock_is_memory(__pfn_to_phys(pfn)); 300 } 301 EXPORT_SYMBOL(pfn_valid); 302 #endif 303 304 #ifndef CONFIG_SPARSEMEM 305 static void __init arm_memory_present(void) 306 { 307 } 308 #else 309 static void __init arm_memory_present(void) 310 { 311 struct memblock_region *reg; 312 313 for_each_memblock(memory, reg) 314 memory_present(0, memblock_region_memory_base_pfn(reg), 315 memblock_region_memory_end_pfn(reg)); 316 } 317 #endif 318 319 static bool arm_memblock_steal_permitted = true; 320 321 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) 322 { 323 phys_addr_t phys; 324 325 BUG_ON(!arm_memblock_steal_permitted); 326 327 phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); 328 memblock_free(phys, size); 329 memblock_remove(phys, size); 330 331 return phys; 332 } 333 334 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) 335 { 336 int i; 337 338 for (i = 0; i < mi->nr_banks; i++) 339 memblock_add(mi->bank[i].start, mi->bank[i].size); 340 341 /* Register the kernel text, kernel data and initrd with memblock. */ 342 #ifdef CONFIG_XIP_KERNEL 343 memblock_reserve(__pa(_sdata), _end - _sdata); 344 #else 345 memblock_reserve(__pa(_stext), _end - _stext); 346 #endif 347 #ifdef CONFIG_BLK_DEV_INITRD 348 if (phys_initrd_size && 349 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 350 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n", 351 phys_initrd_start, phys_initrd_size); 352 phys_initrd_start = phys_initrd_size = 0; 353 } 354 if (phys_initrd_size && 355 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 356 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", 357 phys_initrd_start, phys_initrd_size); 358 phys_initrd_start = phys_initrd_size = 0; 359 } 360 if (phys_initrd_size) { 361 memblock_reserve(phys_initrd_start, phys_initrd_size); 362 363 /* Now convert initrd to virtual addresses */ 364 initrd_start = __phys_to_virt(phys_initrd_start); 365 initrd_end = initrd_start + phys_initrd_size; 366 } 367 #endif 368 369 arm_mm_memblock_reserve(); 370 arm_dt_memblock_reserve(); 371 372 /* reserve any platform specific memblock areas */ 373 if (mdesc->reserve) 374 mdesc->reserve(); 375 376 /* 377 * reserve memory for DMA contigouos allocations, 378 * must come from DMA area inside low memory 379 */ 380 dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit)); 381 382 arm_memblock_steal_permitted = false; 383 memblock_allow_resize(); 384 memblock_dump_all(); 385 } 386 387 void __init bootmem_init(void) 388 { 389 unsigned long min, max_low, max_high; 390 391 max_low = max_high = 0; 392 393 find_limits(&min, &max_low, &max_high); 394 395 arm_bootmem_init(min, max_low); 396 397 /* 398 * Sparsemem tries to allocate bootmem in memory_present(), 399 * so must be done after the fixed reservations 400 */ 401 arm_memory_present(); 402 403 /* 404 * sparse_init() needs the bootmem allocator up and running. 405 */ 406 sparse_init(); 407 408 /* 409 * Now free the memory - free_area_init_node needs 410 * the sparse mem_map arrays initialized by sparse_init() 411 * for memmap_init_zone(), otherwise all PFNs are invalid. 412 */ 413 arm_bootmem_free(min, max_low, max_high); 414 415 /* 416 * This doesn't seem to be used by the Linux memory manager any 417 * more, but is used by ll_rw_block. If we can get rid of it, we 418 * also get rid of some of the stuff above as well. 419 * 420 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 421 * the system, not the maximum PFN. 422 */ 423 max_low_pfn = max_low - PHYS_PFN_OFFSET; 424 max_pfn = max_high - PHYS_PFN_OFFSET; 425 } 426 427 static inline int free_area(unsigned long pfn, unsigned long end, char *s) 428 { 429 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 430 431 for (; pfn < end; pfn++) { 432 struct page *page = pfn_to_page(pfn); 433 ClearPageReserved(page); 434 init_page_count(page); 435 __free_page(page); 436 pages++; 437 } 438 439 if (size && s) 440 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 441 442 return pages; 443 } 444 445 /* 446 * Poison init memory with an undefined instruction (ARM) or a branch to an 447 * undefined instruction (Thumb). 448 */ 449 static inline void poison_init_mem(void *s, size_t count) 450 { 451 u32 *p = (u32 *)s; 452 for (; count != 0; count -= 4) 453 *p++ = 0xe7fddef0; 454 } 455 456 static inline void 457 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 458 { 459 struct page *start_pg, *end_pg; 460 unsigned long pg, pgend; 461 462 /* 463 * Convert start_pfn/end_pfn to a struct page pointer. 464 */ 465 start_pg = pfn_to_page(start_pfn - 1) + 1; 466 end_pg = pfn_to_page(end_pfn - 1) + 1; 467 468 /* 469 * Convert to physical addresses, and 470 * round start upwards and end downwards. 471 */ 472 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 473 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 474 475 /* 476 * If there are free pages between these, 477 * free the section of the memmap array. 478 */ 479 if (pg < pgend) 480 free_bootmem(pg, pgend - pg); 481 } 482 483 /* 484 * The mem_map array can get very big. Free the unused area of the memory map. 485 */ 486 static void __init free_unused_memmap(struct meminfo *mi) 487 { 488 unsigned long bank_start, prev_bank_end = 0; 489 unsigned int i; 490 491 /* 492 * This relies on each bank being in address order. 493 * The banks are sorted previously in bootmem_init(). 494 */ 495 for_each_bank(i, mi) { 496 struct membank *bank = &mi->bank[i]; 497 498 bank_start = bank_pfn_start(bank); 499 500 #ifdef CONFIG_SPARSEMEM 501 /* 502 * Take care not to free memmap entries that don't exist 503 * due to SPARSEMEM sections which aren't present. 504 */ 505 bank_start = min(bank_start, 506 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 507 #else 508 /* 509 * Align down here since the VM subsystem insists that the 510 * memmap entries are valid from the bank start aligned to 511 * MAX_ORDER_NR_PAGES. 512 */ 513 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES); 514 #endif 515 /* 516 * If we had a previous bank, and there is a space 517 * between the current bank and the previous, free it. 518 */ 519 if (prev_bank_end && prev_bank_end < bank_start) 520 free_memmap(prev_bank_end, bank_start); 521 522 /* 523 * Align up here since the VM subsystem insists that the 524 * memmap entries are valid from the bank end aligned to 525 * MAX_ORDER_NR_PAGES. 526 */ 527 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 528 } 529 530 #ifdef CONFIG_SPARSEMEM 531 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) 532 free_memmap(prev_bank_end, 533 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 534 #endif 535 } 536 537 static void __init free_highpages(void) 538 { 539 #ifdef CONFIG_HIGHMEM 540 unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; 541 struct memblock_region *mem, *res; 542 543 /* set highmem page free */ 544 for_each_memblock(memory, mem) { 545 unsigned long start = memblock_region_memory_base_pfn(mem); 546 unsigned long end = memblock_region_memory_end_pfn(mem); 547 548 /* Ignore complete lowmem entries */ 549 if (end <= max_low) 550 continue; 551 552 /* Truncate partial highmem entries */ 553 if (start < max_low) 554 start = max_low; 555 556 /* Find and exclude any reserved regions */ 557 for_each_memblock(reserved, res) { 558 unsigned long res_start, res_end; 559 560 res_start = memblock_region_reserved_base_pfn(res); 561 res_end = memblock_region_reserved_end_pfn(res); 562 563 if (res_end < start) 564 continue; 565 if (res_start < start) 566 res_start = start; 567 if (res_start > end) 568 res_start = end; 569 if (res_end > end) 570 res_end = end; 571 if (res_start != start) 572 totalhigh_pages += free_area(start, res_start, 573 NULL); 574 start = res_end; 575 if (start == end) 576 break; 577 } 578 579 /* And now free anything which remains */ 580 if (start < end) 581 totalhigh_pages += free_area(start, end, NULL); 582 } 583 totalram_pages += totalhigh_pages; 584 #endif 585 } 586 587 /* 588 * mem_init() marks the free areas in the mem_map and tells us how much 589 * memory is free. This is done after various parts of the system have 590 * claimed their memory after the kernel image. 591 */ 592 void __init mem_init(void) 593 { 594 unsigned long reserved_pages, free_pages; 595 struct memblock_region *reg; 596 int i; 597 #ifdef CONFIG_HAVE_TCM 598 /* These pointers are filled in on TCM detection */ 599 extern u32 dtcm_end; 600 extern u32 itcm_end; 601 #endif 602 603 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 604 605 /* this will put all unused low memory onto the freelists */ 606 free_unused_memmap(&meminfo); 607 608 totalram_pages += free_all_bootmem(); 609 610 #ifdef CONFIG_SA1111 611 /* now that our DMA memory is actually so designated, we can free it */ 612 totalram_pages += free_area(PHYS_PFN_OFFSET, 613 __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 614 #endif 615 616 free_highpages(); 617 618 reserved_pages = free_pages = 0; 619 620 for_each_bank(i, &meminfo) { 621 struct membank *bank = &meminfo.bank[i]; 622 unsigned int pfn1, pfn2; 623 struct page *page, *end; 624 625 pfn1 = bank_pfn_start(bank); 626 pfn2 = bank_pfn_end(bank); 627 628 page = pfn_to_page(pfn1); 629 end = pfn_to_page(pfn2 - 1) + 1; 630 631 do { 632 if (PageReserved(page)) 633 reserved_pages++; 634 else if (!page_count(page)) 635 free_pages++; 636 page++; 637 } while (page < end); 638 } 639 640 /* 641 * Since our memory may not be contiguous, calculate the 642 * real number of pages we have in this system 643 */ 644 printk(KERN_INFO "Memory:"); 645 num_physpages = 0; 646 for_each_memblock(memory, reg) { 647 unsigned long pages = memblock_region_memory_end_pfn(reg) - 648 memblock_region_memory_base_pfn(reg); 649 num_physpages += pages; 650 printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); 651 } 652 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 653 654 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 655 nr_free_pages() << (PAGE_SHIFT-10), 656 free_pages << (PAGE_SHIFT-10), 657 reserved_pages << (PAGE_SHIFT-10), 658 totalhigh_pages << (PAGE_SHIFT-10)); 659 660 #define MLK(b, t) b, t, ((t) - (b)) >> 10 661 #define MLM(b, t) b, t, ((t) - (b)) >> 20 662 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 663 664 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 665 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 666 #ifdef CONFIG_HAVE_TCM 667 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 668 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 669 #endif 670 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 671 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 672 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 673 #ifdef CONFIG_HIGHMEM 674 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 675 #endif 676 #ifdef CONFIG_MODULES 677 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 678 #endif 679 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 680 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 681 " .data : 0x%p" " - 0x%p" " (%4d kB)\n" 682 " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", 683 684 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 685 (PAGE_SIZE)), 686 #ifdef CONFIG_HAVE_TCM 687 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 688 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 689 #endif 690 MLK(FIXADDR_START, FIXADDR_TOP), 691 MLM(VMALLOC_START, VMALLOC_END), 692 MLM(PAGE_OFFSET, (unsigned long)high_memory), 693 #ifdef CONFIG_HIGHMEM 694 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 695 (PAGE_SIZE)), 696 #endif 697 #ifdef CONFIG_MODULES 698 MLM(MODULES_VADDR, MODULES_END), 699 #endif 700 701 MLK_ROUNDUP(_text, _etext), 702 MLK_ROUNDUP(__init_begin, __init_end), 703 MLK_ROUNDUP(_sdata, _edata), 704 MLK_ROUNDUP(__bss_start, __bss_stop)); 705 706 #undef MLK 707 #undef MLM 708 #undef MLK_ROUNDUP 709 710 /* 711 * Check boundaries twice: Some fundamental inconsistencies can 712 * be detected at build time already. 713 */ 714 #ifdef CONFIG_MMU 715 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 716 BUG_ON(TASK_SIZE > MODULES_VADDR); 717 #endif 718 719 #ifdef CONFIG_HIGHMEM 720 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 721 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 722 #endif 723 724 if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 725 extern int sysctl_overcommit_memory; 726 /* 727 * On a machine this small we won't get 728 * anywhere without overcommit, so turn 729 * it on by default. 730 */ 731 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 732 } 733 } 734 735 void free_initmem(void) 736 { 737 #ifdef CONFIG_HAVE_TCM 738 extern char __tcm_start, __tcm_end; 739 740 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 741 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 742 __phys_to_pfn(__pa(&__tcm_end)), 743 "TCM link"); 744 #endif 745 746 poison_init_mem(__init_begin, __init_end - __init_begin); 747 if (!machine_is_integrator() && !machine_is_cintegrator()) 748 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 749 __phys_to_pfn(__pa(__init_end)), 750 "init"); 751 } 752 753 #ifdef CONFIG_BLK_DEV_INITRD 754 755 static int keep_initrd; 756 757 void free_initrd_mem(unsigned long start, unsigned long end) 758 { 759 if (!keep_initrd) { 760 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 761 totalram_pages += free_area(__phys_to_pfn(__pa(start)), 762 __phys_to_pfn(__pa(end)), 763 "initrd"); 764 } 765 } 766 767 static int __init keepinitrd_setup(char *__unused) 768 { 769 keep_initrd = 1; 770 return 1; 771 } 772 773 __setup("keepinitrd", keepinitrd_setup); 774 #endif 775