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/of_fdt.h> 19 #include <linux/highmem.h> 20 #include <linux/gfp.h> 21 #include <linux/memblock.h> 22 #include <linux/sort.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 *min = -1UL; 142 *max_low = *max_high = 0; 143 144 for_each_bank (i, mi) { 145 struct membank *bank = &mi->bank[i]; 146 unsigned long start, end; 147 148 start = bank_pfn_start(bank); 149 end = bank_pfn_end(bank); 150 151 if (*min > start) 152 *min = start; 153 if (*max_high < end) 154 *max_high = end; 155 if (bank->highmem) 156 continue; 157 if (*max_low < end) 158 *max_low = end; 159 } 160 } 161 162 static void __init arm_bootmem_init(unsigned long start_pfn, 163 unsigned long end_pfn) 164 { 165 struct memblock_region *reg; 166 unsigned int boot_pages; 167 phys_addr_t bitmap; 168 pg_data_t *pgdat; 169 170 /* 171 * Allocate the bootmem bitmap page. This must be in a region 172 * of memory which has already been mapped. 173 */ 174 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 175 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, 176 __pfn_to_phys(end_pfn)); 177 178 /* 179 * Initialise the bootmem allocator, handing the 180 * memory banks over to bootmem. 181 */ 182 node_set_online(0); 183 pgdat = NODE_DATA(0); 184 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); 185 186 /* Free the lowmem regions from memblock into bootmem. */ 187 for_each_memblock(memory, reg) { 188 unsigned long start = memblock_region_memory_base_pfn(reg); 189 unsigned long end = memblock_region_memory_end_pfn(reg); 190 191 if (end >= end_pfn) 192 end = end_pfn; 193 if (start >= end) 194 break; 195 196 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); 197 } 198 199 /* Reserve the lowmem memblock reserved regions in bootmem. */ 200 for_each_memblock(reserved, reg) { 201 unsigned long start = memblock_region_reserved_base_pfn(reg); 202 unsigned long end = memblock_region_reserved_end_pfn(reg); 203 204 if (end >= end_pfn) 205 end = end_pfn; 206 if (start >= end) 207 break; 208 209 reserve_bootmem(__pfn_to_phys(start), 210 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); 211 } 212 } 213 214 #ifdef CONFIG_ZONE_DMA 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 ARM_DMA_ZONE_SIZE 271 #ifndef CONFIG_ZONE_DMA 272 #error ARM_DMA_ZONE_SIZE set but no DMA zone to limit allocations 273 #endif 274 275 /* 276 * Adjust the sizes according to any special requirements for 277 * this machine type. 278 */ 279 arm_adjust_dma_zone(zone_size, zhole_size, 280 ARM_DMA_ZONE_SIZE >> PAGE_SHIFT); 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 << PAGE_SHIFT); 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 static int __init meminfo_cmp(const void *_a, const void *_b) 310 { 311 const struct membank *a = _a, *b = _b; 312 long cmp = bank_pfn_start(a) - bank_pfn_start(b); 313 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; 314 } 315 316 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) 317 { 318 int i; 319 320 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL); 321 322 memblock_init(); 323 for (i = 0; i < mi->nr_banks; i++) 324 memblock_add(mi->bank[i].start, mi->bank[i].size); 325 326 /* Register the kernel text, kernel data and initrd with memblock. */ 327 #ifdef CONFIG_XIP_KERNEL 328 memblock_reserve(__pa(_sdata), _end - _sdata); 329 #else 330 memblock_reserve(__pa(_stext), _end - _stext); 331 #endif 332 #ifdef CONFIG_BLK_DEV_INITRD 333 if (phys_initrd_size && 334 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 335 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n", 336 phys_initrd_start, phys_initrd_size); 337 phys_initrd_start = phys_initrd_size = 0; 338 } 339 if (phys_initrd_size && 340 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 341 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", 342 phys_initrd_start, phys_initrd_size); 343 phys_initrd_start = phys_initrd_size = 0; 344 } 345 if (phys_initrd_size) { 346 memblock_reserve(phys_initrd_start, phys_initrd_size); 347 348 /* Now convert initrd to virtual addresses */ 349 initrd_start = __phys_to_virt(phys_initrd_start); 350 initrd_end = initrd_start + phys_initrd_size; 351 } 352 #endif 353 354 arm_mm_memblock_reserve(); 355 arm_dt_memblock_reserve(); 356 357 /* reserve any platform specific memblock areas */ 358 if (mdesc->reserve) 359 mdesc->reserve(); 360 361 memblock_analyze(); 362 memblock_dump_all(); 363 } 364 365 void __init bootmem_init(void) 366 { 367 unsigned long min, max_low, max_high; 368 369 max_low = max_high = 0; 370 371 find_limits(&min, &max_low, &max_high); 372 373 arm_bootmem_init(min, max_low); 374 375 /* 376 * Sparsemem tries to allocate bootmem in memory_present(), 377 * so must be done after the fixed reservations 378 */ 379 arm_memory_present(); 380 381 /* 382 * sparse_init() needs the bootmem allocator up and running. 383 */ 384 sparse_init(); 385 386 /* 387 * Now free the memory - free_area_init_node needs 388 * the sparse mem_map arrays initialized by sparse_init() 389 * for memmap_init_zone(), otherwise all PFNs are invalid. 390 */ 391 arm_bootmem_free(min, max_low, max_high); 392 393 high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1; 394 395 /* 396 * This doesn't seem to be used by the Linux memory manager any 397 * more, but is used by ll_rw_block. If we can get rid of it, we 398 * also get rid of some of the stuff above as well. 399 * 400 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 401 * the system, not the maximum PFN. 402 */ 403 max_low_pfn = max_low - PHYS_PFN_OFFSET; 404 max_pfn = max_high - PHYS_PFN_OFFSET; 405 } 406 407 static inline int free_area(unsigned long pfn, unsigned long end, char *s) 408 { 409 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 410 411 for (; pfn < end; pfn++) { 412 struct page *page = pfn_to_page(pfn); 413 ClearPageReserved(page); 414 init_page_count(page); 415 __free_page(page); 416 pages++; 417 } 418 419 if (size && s) 420 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 421 422 return pages; 423 } 424 425 static inline void 426 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 427 { 428 struct page *start_pg, *end_pg; 429 unsigned long pg, pgend; 430 431 /* 432 * Convert start_pfn/end_pfn to a struct page pointer. 433 */ 434 start_pg = pfn_to_page(start_pfn - 1) + 1; 435 end_pg = pfn_to_page(end_pfn - 1) + 1; 436 437 /* 438 * Convert to physical addresses, and 439 * round start upwards and end downwards. 440 */ 441 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 442 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 443 444 /* 445 * If there are free pages between these, 446 * free the section of the memmap array. 447 */ 448 if (pg < pgend) 449 free_bootmem(pg, pgend - pg); 450 } 451 452 /* 453 * The mem_map array can get very big. Free the unused area of the memory map. 454 */ 455 static void __init free_unused_memmap(struct meminfo *mi) 456 { 457 unsigned long bank_start, prev_bank_end = 0; 458 unsigned int i; 459 460 /* 461 * This relies on each bank being in address order. 462 * The banks are sorted previously in bootmem_init(). 463 */ 464 for_each_bank(i, mi) { 465 struct membank *bank = &mi->bank[i]; 466 467 bank_start = bank_pfn_start(bank); 468 469 #ifdef CONFIG_SPARSEMEM 470 /* 471 * Take care not to free memmap entries that don't exist 472 * due to SPARSEMEM sections which aren't present. 473 */ 474 bank_start = min(bank_start, 475 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 476 #endif 477 /* 478 * If we had a previous bank, and there is a space 479 * between the current bank and the previous, free it. 480 */ 481 if (prev_bank_end && prev_bank_end < bank_start) 482 free_memmap(prev_bank_end, bank_start); 483 484 /* 485 * Align up here since the VM subsystem insists that the 486 * memmap entries are valid from the bank end aligned to 487 * MAX_ORDER_NR_PAGES. 488 */ 489 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 490 } 491 492 #ifdef CONFIG_SPARSEMEM 493 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) 494 free_memmap(prev_bank_end, 495 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 496 #endif 497 } 498 499 static void __init free_highpages(void) 500 { 501 #ifdef CONFIG_HIGHMEM 502 unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; 503 struct memblock_region *mem, *res; 504 505 /* set highmem page free */ 506 for_each_memblock(memory, mem) { 507 unsigned long start = memblock_region_memory_base_pfn(mem); 508 unsigned long end = memblock_region_memory_end_pfn(mem); 509 510 /* Ignore complete lowmem entries */ 511 if (end <= max_low) 512 continue; 513 514 /* Truncate partial highmem entries */ 515 if (start < max_low) 516 start = max_low; 517 518 /* Find and exclude any reserved regions */ 519 for_each_memblock(reserved, res) { 520 unsigned long res_start, res_end; 521 522 res_start = memblock_region_reserved_base_pfn(res); 523 res_end = memblock_region_reserved_end_pfn(res); 524 525 if (res_end < start) 526 continue; 527 if (res_start < start) 528 res_start = start; 529 if (res_start > end) 530 res_start = end; 531 if (res_end > end) 532 res_end = end; 533 if (res_start != start) 534 totalhigh_pages += free_area(start, res_start, 535 NULL); 536 start = res_end; 537 if (start == end) 538 break; 539 } 540 541 /* And now free anything which remains */ 542 if (start < end) 543 totalhigh_pages += free_area(start, end, NULL); 544 } 545 totalram_pages += totalhigh_pages; 546 #endif 547 } 548 549 /* 550 * mem_init() marks the free areas in the mem_map and tells us how much 551 * memory is free. This is done after various parts of the system have 552 * claimed their memory after the kernel image. 553 */ 554 void __init mem_init(void) 555 { 556 unsigned long reserved_pages, free_pages; 557 struct memblock_region *reg; 558 int i; 559 #ifdef CONFIG_HAVE_TCM 560 /* These pointers are filled in on TCM detection */ 561 extern u32 dtcm_end; 562 extern u32 itcm_end; 563 #endif 564 565 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 566 567 /* this will put all unused low memory onto the freelists */ 568 free_unused_memmap(&meminfo); 569 570 totalram_pages += free_all_bootmem(); 571 572 #ifdef CONFIG_SA1111 573 /* now that our DMA memory is actually so designated, we can free it */ 574 totalram_pages += free_area(PHYS_PFN_OFFSET, 575 __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 576 #endif 577 578 free_highpages(); 579 580 reserved_pages = free_pages = 0; 581 582 for_each_bank(i, &meminfo) { 583 struct membank *bank = &meminfo.bank[i]; 584 unsigned int pfn1, pfn2; 585 struct page *page, *end; 586 587 pfn1 = bank_pfn_start(bank); 588 pfn2 = bank_pfn_end(bank); 589 590 page = pfn_to_page(pfn1); 591 end = pfn_to_page(pfn2 - 1) + 1; 592 593 do { 594 if (PageReserved(page)) 595 reserved_pages++; 596 else if (!page_count(page)) 597 free_pages++; 598 page++; 599 } while (page < end); 600 } 601 602 /* 603 * Since our memory may not be contiguous, calculate the 604 * real number of pages we have in this system 605 */ 606 printk(KERN_INFO "Memory:"); 607 num_physpages = 0; 608 for_each_memblock(memory, reg) { 609 unsigned long pages = memblock_region_memory_end_pfn(reg) - 610 memblock_region_memory_base_pfn(reg); 611 num_physpages += pages; 612 printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); 613 } 614 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 615 616 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 617 nr_free_pages() << (PAGE_SHIFT-10), 618 free_pages << (PAGE_SHIFT-10), 619 reserved_pages << (PAGE_SHIFT-10), 620 totalhigh_pages << (PAGE_SHIFT-10)); 621 622 #define MLK(b, t) b, t, ((t) - (b)) >> 10 623 #define MLM(b, t) b, t, ((t) - (b)) >> 20 624 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 625 626 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 627 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 628 #ifdef CONFIG_HAVE_TCM 629 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 630 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 631 #endif 632 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 633 #ifdef CONFIG_MMU 634 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" 635 #endif 636 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 637 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 638 #ifdef CONFIG_HIGHMEM 639 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 640 #endif 641 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 642 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 643 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 644 " .data : 0x%p" " - 0x%p" " (%4d kB)\n" 645 " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", 646 647 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 648 (PAGE_SIZE)), 649 #ifdef CONFIG_HAVE_TCM 650 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 651 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 652 #endif 653 MLK(FIXADDR_START, FIXADDR_TOP), 654 #ifdef CONFIG_MMU 655 MLM(CONSISTENT_BASE, CONSISTENT_END), 656 #endif 657 MLM(VMALLOC_START, VMALLOC_END), 658 MLM(PAGE_OFFSET, (unsigned long)high_memory), 659 #ifdef CONFIG_HIGHMEM 660 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 661 (PAGE_SIZE)), 662 #endif 663 MLM(MODULES_VADDR, MODULES_END), 664 665 MLK_ROUNDUP(_text, _etext), 666 MLK_ROUNDUP(__init_begin, __init_end), 667 MLK_ROUNDUP(_sdata, _edata), 668 MLK_ROUNDUP(__bss_start, __bss_stop)); 669 670 #undef MLK 671 #undef MLM 672 #undef MLK_ROUNDUP 673 674 /* 675 * Check boundaries twice: Some fundamental inconsistencies can 676 * be detected at build time already. 677 */ 678 #ifdef CONFIG_MMU 679 BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); 680 BUG_ON(VMALLOC_END > CONSISTENT_BASE); 681 682 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 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 708 __phys_to_pfn(__pa(&__tcm_end)), 709 "TCM link"); 710 #endif 711 712 if (!machine_is_integrator() && !machine_is_cintegrator()) 713 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 714 __phys_to_pfn(__pa(__init_end)), 715 "init"); 716 } 717 718 #ifdef CONFIG_BLK_DEV_INITRD 719 720 static int keep_initrd; 721 722 void free_initrd_mem(unsigned long start, unsigned long end) 723 { 724 if (!keep_initrd) 725 totalram_pages += free_area(__phys_to_pfn(__pa(start)), 726 __phys_to_pfn(__pa(end)), 727 "initrd"); 728 } 729 730 static int __init keepinitrd_setup(char *__unused) 731 { 732 keep_initrd = 1; 733 return 1; 734 } 735 736 __setup("keepinitrd", keepinitrd_setup); 737 #endif 738