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/sort.h> 19 #include <linux/highmem.h> 20 21 #include <asm/mach-types.h> 22 #include <asm/sections.h> 23 #include <asm/setup.h> 24 #include <asm/sizes.h> 25 #include <asm/tlb.h> 26 #include <asm/fixmap.h> 27 28 #include <asm/mach/arch.h> 29 #include <asm/mach/map.h> 30 31 #include "mm.h" 32 33 static unsigned long phys_initrd_start __initdata = 0; 34 static unsigned long phys_initrd_size __initdata = 0; 35 36 static int __init early_initrd(char *p) 37 { 38 unsigned long start, size; 39 char *endp; 40 41 start = memparse(p, &endp); 42 if (*endp == ',') { 43 size = memparse(endp + 1, NULL); 44 45 phys_initrd_start = start; 46 phys_initrd_size = size; 47 } 48 return 0; 49 } 50 early_param("initrd", early_initrd); 51 52 static int __init parse_tag_initrd(const struct tag *tag) 53 { 54 printk(KERN_WARNING "ATAG_INITRD is deprecated; " 55 "please update your bootloader.\n"); 56 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 57 phys_initrd_size = tag->u.initrd.size; 58 return 0; 59 } 60 61 __tagtable(ATAG_INITRD, parse_tag_initrd); 62 63 static int __init parse_tag_initrd2(const struct tag *tag) 64 { 65 phys_initrd_start = tag->u.initrd.start; 66 phys_initrd_size = tag->u.initrd.size; 67 return 0; 68 } 69 70 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 71 72 /* 73 * This keeps memory configuration data used by a couple memory 74 * initialization functions, as well as show_mem() for the skipping 75 * of holes in the memory map. It is populated by arm_add_memory(). 76 */ 77 struct meminfo meminfo; 78 79 void show_mem(void) 80 { 81 int free = 0, total = 0, reserved = 0; 82 int shared = 0, cached = 0, slab = 0, node, i; 83 struct meminfo * mi = &meminfo; 84 85 printk("Mem-info:\n"); 86 show_free_areas(); 87 for_each_online_node(node) { 88 pg_data_t *n = NODE_DATA(node); 89 struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; 90 91 for_each_nodebank (i,mi,node) { 92 struct membank *bank = &mi->bank[i]; 93 unsigned int pfn1, pfn2; 94 struct page *page, *end; 95 96 pfn1 = bank_pfn_start(bank); 97 pfn2 = bank_pfn_end(bank); 98 99 page = map + pfn1; 100 end = map + pfn2; 101 102 do { 103 total++; 104 if (PageReserved(page)) 105 reserved++; 106 else if (PageSwapCache(page)) 107 cached++; 108 else if (PageSlab(page)) 109 slab++; 110 else if (!page_count(page)) 111 free++; 112 else 113 shared += page_count(page) - 1; 114 page++; 115 } while (page < end); 116 } 117 } 118 119 printk("%d pages of RAM\n", total); 120 printk("%d free pages\n", free); 121 printk("%d reserved pages\n", reserved); 122 printk("%d slab pages\n", slab); 123 printk("%d pages shared\n", shared); 124 printk("%d pages swap cached\n", cached); 125 } 126 127 static void __init find_node_limits(int node, struct meminfo *mi, 128 unsigned long *min, unsigned long *max_low, unsigned long *max_high) 129 { 130 int i; 131 132 *min = -1UL; 133 *max_low = *max_high = 0; 134 135 for_each_nodebank(i, mi, node) { 136 struct membank *bank = &mi->bank[i]; 137 unsigned long start, end; 138 139 start = bank_pfn_start(bank); 140 end = bank_pfn_end(bank); 141 142 if (*min > start) 143 *min = start; 144 if (*max_high < end) 145 *max_high = end; 146 if (bank->highmem) 147 continue; 148 if (*max_low < end) 149 *max_low = end; 150 } 151 } 152 153 /* 154 * FIXME: We really want to avoid allocating the bootmap bitmap 155 * over the top of the initrd. Hopefully, this is located towards 156 * the start of a bank, so if we allocate the bootmap bitmap at 157 * the end, we won't clash. 158 */ 159 static unsigned int __init 160 find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) 161 { 162 unsigned int start_pfn, i, bootmap_pfn; 163 164 start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT; 165 bootmap_pfn = 0; 166 167 for_each_nodebank(i, mi, node) { 168 struct membank *bank = &mi->bank[i]; 169 unsigned int start, end; 170 171 start = bank_pfn_start(bank); 172 end = bank_pfn_end(bank); 173 174 if (end < start_pfn) 175 continue; 176 177 if (start < start_pfn) 178 start = start_pfn; 179 180 if (end <= start) 181 continue; 182 183 if (end - start >= bootmap_pages) { 184 bootmap_pfn = start; 185 break; 186 } 187 } 188 189 if (bootmap_pfn == 0) 190 BUG(); 191 192 return bootmap_pfn; 193 } 194 195 static int __init check_initrd(struct meminfo *mi) 196 { 197 int initrd_node = -2; 198 #ifdef CONFIG_BLK_DEV_INITRD 199 unsigned long end = phys_initrd_start + phys_initrd_size; 200 201 /* 202 * Make sure that the initrd is within a valid area of 203 * memory. 204 */ 205 if (phys_initrd_size) { 206 unsigned int i; 207 208 initrd_node = -1; 209 210 for (i = 0; i < mi->nr_banks; i++) { 211 struct membank *bank = &mi->bank[i]; 212 if (bank_phys_start(bank) <= phys_initrd_start && 213 end <= bank_phys_end(bank)) 214 initrd_node = bank->node; 215 } 216 } 217 218 if (initrd_node == -1) { 219 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond " 220 "physical memory - disabling initrd\n", 221 phys_initrd_start, phys_initrd_size); 222 phys_initrd_start = phys_initrd_size = 0; 223 } 224 #endif 225 226 return initrd_node; 227 } 228 229 static inline void map_memory_bank(struct membank *bank) 230 { 231 #ifdef CONFIG_MMU 232 struct map_desc map; 233 234 map.pfn = bank_pfn_start(bank); 235 map.virtual = __phys_to_virt(bank_phys_start(bank)); 236 map.length = bank_phys_size(bank); 237 map.type = MT_MEMORY; 238 239 create_mapping(&map); 240 #endif 241 } 242 243 static void __init bootmem_init_node(int node, struct meminfo *mi, 244 unsigned long start_pfn, unsigned long end_pfn) 245 { 246 unsigned long boot_pfn; 247 unsigned int boot_pages; 248 pg_data_t *pgdat; 249 int i; 250 251 /* 252 * Map the memory banks for this node. 253 */ 254 for_each_nodebank(i, mi, node) { 255 struct membank *bank = &mi->bank[i]; 256 257 if (!bank->highmem) 258 map_memory_bank(bank); 259 } 260 261 /* 262 * Allocate the bootmem bitmap page. 263 */ 264 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 265 boot_pfn = find_bootmap_pfn(node, mi, boot_pages); 266 267 /* 268 * Initialise the bootmem allocator for this node, handing the 269 * memory banks over to bootmem. 270 */ 271 node_set_online(node); 272 pgdat = NODE_DATA(node); 273 init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); 274 275 for_each_nodebank(i, mi, node) { 276 struct membank *bank = &mi->bank[i]; 277 if (!bank->highmem) 278 free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank)); 279 } 280 281 /* 282 * Reserve the bootmem bitmap for this node. 283 */ 284 reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, 285 boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT); 286 } 287 288 static void __init bootmem_reserve_initrd(int node) 289 { 290 #ifdef CONFIG_BLK_DEV_INITRD 291 pg_data_t *pgdat = NODE_DATA(node); 292 int res; 293 294 res = reserve_bootmem_node(pgdat, phys_initrd_start, 295 phys_initrd_size, BOOTMEM_EXCLUSIVE); 296 297 if (res == 0) { 298 initrd_start = __phys_to_virt(phys_initrd_start); 299 initrd_end = initrd_start + phys_initrd_size; 300 } else { 301 printk(KERN_ERR 302 "INITRD: 0x%08lx+0x%08lx overlaps in-use " 303 "memory region - disabling initrd\n", 304 phys_initrd_start, phys_initrd_size); 305 } 306 #endif 307 } 308 309 static void __init bootmem_free_node(int node, struct meminfo *mi) 310 { 311 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 312 unsigned long min, max_low, max_high; 313 int i; 314 315 find_node_limits(node, mi, &min, &max_low, &max_high); 316 317 /* 318 * initialise the zones within this node. 319 */ 320 memset(zone_size, 0, sizeof(zone_size)); 321 322 /* 323 * The size of this node has already been determined. If we need 324 * to do anything fancy with the allocation of this memory to the 325 * zones, now is the time to do it. 326 */ 327 zone_size[0] = max_low - min; 328 #ifdef CONFIG_HIGHMEM 329 zone_size[ZONE_HIGHMEM] = max_high - max_low; 330 #endif 331 332 /* 333 * For each bank in this node, calculate the size of the holes. 334 * holes = node_size - sum(bank_sizes_in_node) 335 */ 336 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 337 for_each_nodebank(i, mi, node) { 338 int idx = 0; 339 #ifdef CONFIG_HIGHMEM 340 if (mi->bank[i].highmem) 341 idx = ZONE_HIGHMEM; 342 #endif 343 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]); 344 } 345 346 /* 347 * Adjust the sizes according to any special requirements for 348 * this machine type. 349 */ 350 arch_adjust_zones(node, zone_size, zhole_size); 351 352 free_area_init_node(node, zone_size, min, zhole_size); 353 } 354 355 #ifndef CONFIG_SPARSEMEM 356 int pfn_valid(unsigned long pfn) 357 { 358 struct meminfo *mi = &meminfo; 359 unsigned int left = 0, right = mi->nr_banks; 360 361 do { 362 unsigned int mid = (right + left) / 2; 363 struct membank *bank = &mi->bank[mid]; 364 365 if (pfn < bank_pfn_start(bank)) 366 right = mid; 367 else if (pfn >= bank_pfn_end(bank)) 368 left = mid + 1; 369 else 370 return 1; 371 } while (left < right); 372 return 0; 373 } 374 EXPORT_SYMBOL(pfn_valid); 375 376 static void arm_memory_present(struct meminfo *mi, int node) 377 { 378 } 379 #else 380 static void arm_memory_present(struct meminfo *mi, int node) 381 { 382 int i; 383 for_each_nodebank(i, mi, node) { 384 struct membank *bank = &mi->bank[i]; 385 memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank)); 386 } 387 } 388 #endif 389 390 static int __init meminfo_cmp(const void *_a, const void *_b) 391 { 392 const struct membank *a = _a, *b = _b; 393 long cmp = bank_pfn_start(a) - bank_pfn_start(b); 394 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; 395 } 396 397 void __init bootmem_init(void) 398 { 399 struct meminfo *mi = &meminfo; 400 unsigned long min, max_low, max_high; 401 int node, initrd_node; 402 403 sort(&mi->bank, mi->nr_banks, sizeof(mi->bank[0]), meminfo_cmp, NULL); 404 405 /* 406 * Locate which node contains the ramdisk image, if any. 407 */ 408 initrd_node = check_initrd(mi); 409 410 max_low = max_high = 0; 411 412 /* 413 * Run through each node initialising the bootmem allocator. 414 */ 415 for_each_node(node) { 416 unsigned long node_low, node_high; 417 418 find_node_limits(node, mi, &min, &node_low, &node_high); 419 420 if (node_low > max_low) 421 max_low = node_low; 422 if (node_high > max_high) 423 max_high = node_high; 424 425 /* 426 * If there is no memory in this node, ignore it. 427 * (We can't have nodes which have no lowmem) 428 */ 429 if (node_low == 0) 430 continue; 431 432 bootmem_init_node(node, mi, min, node_low); 433 434 /* 435 * Reserve any special node zero regions. 436 */ 437 if (node == 0) 438 reserve_node_zero(NODE_DATA(node)); 439 440 /* 441 * If the initrd is in this node, reserve its memory. 442 */ 443 if (node == initrd_node) 444 bootmem_reserve_initrd(node); 445 446 /* 447 * Sparsemem tries to allocate bootmem in memory_present(), 448 * so must be done after the fixed reservations 449 */ 450 arm_memory_present(mi, node); 451 } 452 453 /* 454 * sparse_init() needs the bootmem allocator up and running. 455 */ 456 sparse_init(); 457 458 /* 459 * Now free memory in each node - free_area_init_node needs 460 * the sparse mem_map arrays initialized by sparse_init() 461 * for memmap_init_zone(), otherwise all PFNs are invalid. 462 */ 463 for_each_node(node) 464 bootmem_free_node(node, mi); 465 466 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; 467 468 /* 469 * This doesn't seem to be used by the Linux memory manager any 470 * more, but is used by ll_rw_block. If we can get rid of it, we 471 * also get rid of some of the stuff above as well. 472 * 473 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 474 * the system, not the maximum PFN. 475 */ 476 max_low_pfn = max_low - PHYS_PFN_OFFSET; 477 max_pfn = max_high - PHYS_PFN_OFFSET; 478 } 479 480 static inline int free_area(unsigned long pfn, unsigned long end, char *s) 481 { 482 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 483 484 for (; pfn < end; pfn++) { 485 struct page *page = pfn_to_page(pfn); 486 ClearPageReserved(page); 487 init_page_count(page); 488 __free_page(page); 489 pages++; 490 } 491 492 if (size && s) 493 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 494 495 return pages; 496 } 497 498 static inline void 499 free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) 500 { 501 struct page *start_pg, *end_pg; 502 unsigned long pg, pgend; 503 504 /* 505 * Convert start_pfn/end_pfn to a struct page pointer. 506 */ 507 start_pg = pfn_to_page(start_pfn - 1) + 1; 508 end_pg = pfn_to_page(end_pfn); 509 510 /* 511 * Convert to physical addresses, and 512 * round start upwards and end downwards. 513 */ 514 pg = PAGE_ALIGN(__pa(start_pg)); 515 pgend = __pa(end_pg) & PAGE_MASK; 516 517 /* 518 * If there are free pages between these, 519 * free the section of the memmap array. 520 */ 521 if (pg < pgend) 522 free_bootmem_node(NODE_DATA(node), pg, pgend - pg); 523 } 524 525 /* 526 * The mem_map array can get very big. Free the unused area of the memory map. 527 */ 528 static void __init free_unused_memmap_node(int node, struct meminfo *mi) 529 { 530 unsigned long bank_start, prev_bank_end = 0; 531 unsigned int i; 532 533 /* 534 * [FIXME] This relies on each bank being in address order. This 535 * may not be the case, especially if the user has provided the 536 * information on the command line. 537 */ 538 for_each_nodebank(i, mi, node) { 539 struct membank *bank = &mi->bank[i]; 540 541 bank_start = bank_pfn_start(bank); 542 if (bank_start < prev_bank_end) { 543 printk(KERN_ERR "MEM: unordered memory banks. " 544 "Not freeing memmap.\n"); 545 break; 546 } 547 548 /* 549 * If we had a previous bank, and there is a space 550 * between the current bank and the previous, free it. 551 */ 552 if (prev_bank_end && prev_bank_end != bank_start) 553 free_memmap(node, prev_bank_end, bank_start); 554 555 prev_bank_end = bank_pfn_end(bank); 556 } 557 } 558 559 /* 560 * mem_init() marks the free areas in the mem_map and tells us how much 561 * memory is free. This is done after various parts of the system have 562 * claimed their memory after the kernel image. 563 */ 564 void __init mem_init(void) 565 { 566 unsigned long reserved_pages, free_pages; 567 int i, node; 568 569 #ifndef CONFIG_DISCONTIGMEM 570 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 571 #endif 572 573 /* this will put all unused low memory onto the freelists */ 574 for_each_online_node(node) { 575 pg_data_t *pgdat = NODE_DATA(node); 576 577 free_unused_memmap_node(node, &meminfo); 578 579 if (pgdat->node_spanned_pages != 0) 580 totalram_pages += free_all_bootmem_node(pgdat); 581 } 582 583 #ifdef CONFIG_SA1111 584 /* now that our DMA memory is actually so designated, we can free it */ 585 totalram_pages += free_area(PHYS_PFN_OFFSET, 586 __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 587 #endif 588 589 #ifdef CONFIG_HIGHMEM 590 /* set highmem page free */ 591 for_each_online_node(node) { 592 for_each_nodebank (i, &meminfo, node) { 593 unsigned long start = bank_pfn_start(&meminfo.bank[i]); 594 unsigned long end = bank_pfn_end(&meminfo.bank[i]); 595 if (start >= max_low_pfn + PHYS_PFN_OFFSET) 596 totalhigh_pages += free_area(start, end, NULL); 597 } 598 } 599 totalram_pages += totalhigh_pages; 600 #endif 601 602 reserved_pages = free_pages = 0; 603 604 for_each_online_node(node) { 605 pg_data_t *n = NODE_DATA(node); 606 struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn; 607 608 for_each_nodebank(i, &meminfo, node) { 609 struct membank *bank = &meminfo.bank[i]; 610 unsigned int pfn1, pfn2; 611 struct page *page, *end; 612 613 pfn1 = bank_pfn_start(bank); 614 pfn2 = bank_pfn_end(bank); 615 616 page = map + pfn1; 617 end = map + pfn2; 618 619 do { 620 if (PageReserved(page)) 621 reserved_pages++; 622 else if (!page_count(page)) 623 free_pages++; 624 page++; 625 } while (page < end); 626 } 627 } 628 629 /* 630 * Since our memory may not be contiguous, calculate the 631 * real number of pages we have in this system 632 */ 633 printk(KERN_INFO "Memory:"); 634 num_physpages = 0; 635 for (i = 0; i < meminfo.nr_banks; i++) { 636 num_physpages += bank_pfn_size(&meminfo.bank[i]); 637 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); 638 } 639 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 640 641 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 642 nr_free_pages() << (PAGE_SHIFT-10), 643 free_pages << (PAGE_SHIFT-10), 644 reserved_pages << (PAGE_SHIFT-10), 645 totalhigh_pages << (PAGE_SHIFT-10)); 646 647 #define MLK(b, t) b, t, ((t) - (b)) >> 10 648 #define MLM(b, t) b, t, ((t) - (b)) >> 20 649 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 650 651 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 652 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 653 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 654 #ifdef CONFIG_MMU 655 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" 656 #endif 657 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 658 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 659 #ifdef CONFIG_HIGHMEM 660 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 661 #endif 662 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 663 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 664 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 665 " .data : 0x%p" " - 0x%p" " (%4d kB)\n", 666 667 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 668 (PAGE_SIZE)), 669 MLK(FIXADDR_START, FIXADDR_TOP), 670 #ifdef CONFIG_MMU 671 MLM(CONSISTENT_BASE, CONSISTENT_END), 672 #endif 673 MLM(VMALLOC_START, VMALLOC_END), 674 MLM(PAGE_OFFSET, (unsigned long)high_memory), 675 #ifdef CONFIG_HIGHMEM 676 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 677 (PAGE_SIZE)), 678 #endif 679 MLM(MODULES_VADDR, MODULES_END), 680 681 MLK_ROUNDUP(__init_begin, __init_end), 682 MLK_ROUNDUP(_text, _etext), 683 MLK_ROUNDUP(_data, _edata)); 684 685 #undef MLK 686 #undef MLM 687 #undef MLK_ROUNDUP 688 689 /* 690 * Check boundaries twice: Some fundamental inconsistencies can 691 * be detected at build time already. 692 */ 693 #ifdef CONFIG_MMU 694 BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); 695 BUG_ON(VMALLOC_END > CONSISTENT_BASE); 696 697 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 698 BUG_ON(TASK_SIZE > MODULES_VADDR); 699 #endif 700 701 #ifdef CONFIG_HIGHMEM 702 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 703 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 704 #endif 705 706 if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 707 extern int sysctl_overcommit_memory; 708 /* 709 * On a machine this small we won't get 710 * anywhere without overcommit, so turn 711 * it on by default. 712 */ 713 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 714 } 715 } 716 717 void free_initmem(void) 718 { 719 #ifdef CONFIG_HAVE_TCM 720 extern char *__tcm_start, *__tcm_end; 721 722 totalram_pages += free_area(__phys_to_pfn(__pa(__tcm_start)), 723 __phys_to_pfn(__pa(__tcm_end)), 724 "TCM link"); 725 #endif 726 727 if (!machine_is_integrator() && !machine_is_cintegrator()) 728 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 729 __phys_to_pfn(__pa(__init_end)), 730 "init"); 731 } 732 733 #ifdef CONFIG_BLK_DEV_INITRD 734 735 static int keep_initrd; 736 737 void free_initrd_mem(unsigned long start, unsigned long end) 738 { 739 if (!keep_initrd) 740 totalram_pages += free_area(__phys_to_pfn(__pa(start)), 741 __phys_to_pfn(__pa(end)), 742 "initrd"); 743 } 744 745 static int __init keepinitrd_setup(char *__unused) 746 { 747 keep_initrd = 1; 748 return 1; 749 } 750 751 __setup("keepinitrd", keepinitrd_setup); 752 #endif 753