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