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/of_reserved_mem.h> 21 #include <linux/highmem.h> 22 #include <linux/gfp.h> 23 #include <linux/memblock.h> 24 #include <linux/dma-contiguous.h> 25 #include <linux/sizes.h> 26 27 #include <asm/mach-types.h> 28 #include <asm/memblock.h> 29 #include <asm/prom.h> 30 #include <asm/sections.h> 31 #include <asm/setup.h> 32 #include <asm/tlb.h> 33 #include <asm/fixmap.h> 34 35 #include <asm/mach/arch.h> 36 #include <asm/mach/map.h> 37 38 #include "mm.h" 39 40 static phys_addr_t phys_initrd_start __initdata = 0; 41 static unsigned long phys_initrd_size __initdata = 0; 42 43 static int __init early_initrd(char *p) 44 { 45 phys_addr_t start; 46 unsigned long size; 47 char *endp; 48 49 start = memparse(p, &endp); 50 if (*endp == ',') { 51 size = memparse(endp + 1, NULL); 52 53 phys_initrd_start = start; 54 phys_initrd_size = size; 55 } 56 return 0; 57 } 58 early_param("initrd", early_initrd); 59 60 static int __init parse_tag_initrd(const struct tag *tag) 61 { 62 printk(KERN_WARNING "ATAG_INITRD is deprecated; " 63 "please update your bootloader.\n"); 64 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 65 phys_initrd_size = tag->u.initrd.size; 66 return 0; 67 } 68 69 __tagtable(ATAG_INITRD, parse_tag_initrd); 70 71 static int __init parse_tag_initrd2(const struct tag *tag) 72 { 73 phys_initrd_start = tag->u.initrd.start; 74 phys_initrd_size = tag->u.initrd.size; 75 return 0; 76 } 77 78 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 79 80 #ifdef CONFIG_OF_FLATTREE 81 void __init early_init_dt_setup_initrd_arch(u64 start, u64 end) 82 { 83 phys_initrd_start = start; 84 phys_initrd_size = end - start; 85 } 86 #endif /* CONFIG_OF_FLATTREE */ 87 88 /* 89 * This keeps memory configuration data used by a couple memory 90 * initialization functions, as well as show_mem() for the skipping 91 * of holes in the memory map. It is populated by arm_add_memory(). 92 */ 93 struct meminfo meminfo; 94 95 void show_mem(unsigned int filter) 96 { 97 int free = 0, total = 0, reserved = 0; 98 int shared = 0, cached = 0, slab = 0, i; 99 struct meminfo * mi = &meminfo; 100 101 printk("Mem-info:\n"); 102 show_free_areas(filter); 103 104 if (filter & SHOW_MEM_FILTER_PAGE_COUNT) 105 return; 106 107 for_each_bank (i, mi) { 108 struct membank *bank = &mi->bank[i]; 109 unsigned int pfn1, pfn2; 110 struct page *page, *end; 111 112 pfn1 = bank_pfn_start(bank); 113 pfn2 = bank_pfn_end(bank); 114 115 page = pfn_to_page(pfn1); 116 end = pfn_to_page(pfn2 - 1) + 1; 117 118 do { 119 total++; 120 if (PageReserved(page)) 121 reserved++; 122 else if (PageSwapCache(page)) 123 cached++; 124 else if (PageSlab(page)) 125 slab++; 126 else if (!page_count(page)) 127 free++; 128 else 129 shared += page_count(page) - 1; 130 page++; 131 } while (page < end); 132 } 133 134 printk("%d pages of RAM\n", total); 135 printk("%d free pages\n", free); 136 printk("%d reserved pages\n", reserved); 137 printk("%d slab pages\n", slab); 138 printk("%d pages shared\n", shared); 139 printk("%d pages swap cached\n", cached); 140 } 141 142 static void __init find_limits(unsigned long *min, unsigned long *max_low, 143 unsigned long *max_high) 144 { 145 struct meminfo *mi = &meminfo; 146 int i; 147 148 /* This assumes the meminfo array is properly sorted */ 149 *min = bank_pfn_start(&mi->bank[0]); 150 for_each_bank (i, mi) 151 if (mi->bank[i].highmem) 152 break; 153 *max_low = bank_pfn_end(&mi->bank[i - 1]); 154 *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]); 155 } 156 157 static void __init arm_bootmem_init(unsigned long start_pfn, 158 unsigned long end_pfn) 159 { 160 struct memblock_region *reg; 161 unsigned int boot_pages; 162 phys_addr_t bitmap; 163 pg_data_t *pgdat; 164 165 /* 166 * Allocate the bootmem bitmap page. This must be in a region 167 * of memory which has already been mapped. 168 */ 169 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 170 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, 171 __pfn_to_phys(end_pfn)); 172 173 /* 174 * Initialise the bootmem allocator, handing the 175 * memory banks over to bootmem. 176 */ 177 node_set_online(0); 178 pgdat = NODE_DATA(0); 179 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); 180 181 /* Free the lowmem regions from memblock into bootmem. */ 182 for_each_memblock(memory, reg) { 183 unsigned long start = memblock_region_memory_base_pfn(reg); 184 unsigned long end = memblock_region_memory_end_pfn(reg); 185 186 if (end >= end_pfn) 187 end = end_pfn; 188 if (start >= end) 189 break; 190 191 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); 192 } 193 194 /* Reserve the lowmem memblock reserved regions in bootmem. */ 195 for_each_memblock(reserved, reg) { 196 unsigned long start = memblock_region_reserved_base_pfn(reg); 197 unsigned long end = memblock_region_reserved_end_pfn(reg); 198 199 if (end >= end_pfn) 200 end = end_pfn; 201 if (start >= end) 202 break; 203 204 reserve_bootmem(__pfn_to_phys(start), 205 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); 206 } 207 } 208 209 #ifdef CONFIG_ZONE_DMA 210 211 phys_addr_t arm_dma_zone_size __read_mostly; 212 EXPORT_SYMBOL(arm_dma_zone_size); 213 214 /* 215 * The DMA mask corresponding to the maximum bus address allocatable 216 * using GFP_DMA. The default here places no restriction on DMA 217 * allocations. This must be the smallest DMA mask in the system, 218 * so a successful GFP_DMA allocation will always satisfy this. 219 */ 220 phys_addr_t arm_dma_limit; 221 unsigned long arm_dma_pfn_limit; 222 223 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 224 unsigned long dma_size) 225 { 226 if (size[0] <= dma_size) 227 return; 228 229 size[ZONE_NORMAL] = size[0] - dma_size; 230 size[ZONE_DMA] = dma_size; 231 hole[ZONE_NORMAL] = hole[0]; 232 hole[ZONE_DMA] = 0; 233 } 234 #endif 235 236 void __init setup_dma_zone(const struct machine_desc *mdesc) 237 { 238 #ifdef CONFIG_ZONE_DMA 239 if (mdesc->dma_zone_size) { 240 arm_dma_zone_size = mdesc->dma_zone_size; 241 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; 242 } else 243 arm_dma_limit = 0xffffffff; 244 arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; 245 #endif 246 } 247 248 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, 249 unsigned long max_high) 250 { 251 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 252 struct memblock_region *reg; 253 254 /* 255 * initialise the zones. 256 */ 257 memset(zone_size, 0, sizeof(zone_size)); 258 259 /* 260 * The memory size has already been determined. If we need 261 * to do anything fancy with the allocation of this memory 262 * to the zones, now is the time to do it. 263 */ 264 zone_size[0] = max_low - min; 265 #ifdef CONFIG_HIGHMEM 266 zone_size[ZONE_HIGHMEM] = max_high - max_low; 267 #endif 268 269 /* 270 * Calculate the size of the holes. 271 * holes = node_size - sum(bank_sizes) 272 */ 273 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 274 for_each_memblock(memory, reg) { 275 unsigned long start = memblock_region_memory_base_pfn(reg); 276 unsigned long end = memblock_region_memory_end_pfn(reg); 277 278 if (start < max_low) { 279 unsigned long low_end = min(end, max_low); 280 zhole_size[0] -= low_end - start; 281 } 282 #ifdef CONFIG_HIGHMEM 283 if (end > max_low) { 284 unsigned long high_start = max(start, max_low); 285 zhole_size[ZONE_HIGHMEM] -= end - high_start; 286 } 287 #endif 288 } 289 290 #ifdef CONFIG_ZONE_DMA 291 /* 292 * Adjust the sizes according to any special requirements for 293 * this machine type. 294 */ 295 if (arm_dma_zone_size) 296 arm_adjust_dma_zone(zone_size, zhole_size, 297 arm_dma_zone_size >> PAGE_SHIFT); 298 #endif 299 300 free_area_init_node(0, zone_size, min, zhole_size); 301 } 302 303 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 304 int pfn_valid(unsigned long pfn) 305 { 306 return memblock_is_memory(__pfn_to_phys(pfn)); 307 } 308 EXPORT_SYMBOL(pfn_valid); 309 #endif 310 311 #ifndef CONFIG_SPARSEMEM 312 static void __init arm_memory_present(void) 313 { 314 } 315 #else 316 static void __init arm_memory_present(void) 317 { 318 struct memblock_region *reg; 319 320 for_each_memblock(memory, reg) 321 memory_present(0, memblock_region_memory_base_pfn(reg), 322 memblock_region_memory_end_pfn(reg)); 323 } 324 #endif 325 326 static bool arm_memblock_steal_permitted = true; 327 328 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) 329 { 330 phys_addr_t phys; 331 332 BUG_ON(!arm_memblock_steal_permitted); 333 334 phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); 335 memblock_free(phys, size); 336 memblock_remove(phys, size); 337 338 return phys; 339 } 340 341 void __init arm_memblock_init(struct meminfo *mi, 342 const struct machine_desc *mdesc) 343 { 344 int i; 345 346 for (i = 0; i < mi->nr_banks; i++) 347 memblock_add(mi->bank[i].start, mi->bank[i].size); 348 349 /* Register the kernel text, kernel data and initrd with memblock. */ 350 #ifdef CONFIG_XIP_KERNEL 351 memblock_reserve(__pa(_sdata), _end - _sdata); 352 #else 353 memblock_reserve(__pa(_stext), _end - _stext); 354 #endif 355 #ifdef CONFIG_BLK_DEV_INITRD 356 if (phys_initrd_size && 357 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 358 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", 359 (u64)phys_initrd_start, phys_initrd_size); 360 phys_initrd_start = phys_initrd_size = 0; 361 } 362 if (phys_initrd_size && 363 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 364 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", 365 (u64)phys_initrd_start, phys_initrd_size); 366 phys_initrd_start = phys_initrd_size = 0; 367 } 368 if (phys_initrd_size) { 369 memblock_reserve(phys_initrd_start, phys_initrd_size); 370 371 /* Now convert initrd to virtual addresses */ 372 initrd_start = __phys_to_virt(phys_initrd_start); 373 initrd_end = initrd_start + phys_initrd_size; 374 } 375 #endif 376 377 arm_mm_memblock_reserve(); 378 arm_dt_memblock_reserve(); 379 380 /* reserve any platform specific memblock areas */ 381 if (mdesc->reserve) 382 mdesc->reserve(); 383 384 early_init_dt_scan_reserved_mem(); 385 386 /* 387 * reserve memory for DMA contigouos allocations, 388 * must come from DMA area inside low memory 389 */ 390 dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit)); 391 392 arm_memblock_steal_permitted = false; 393 memblock_allow_resize(); 394 memblock_dump_all(); 395 } 396 397 void __init bootmem_init(void) 398 { 399 unsigned long min, max_low, max_high; 400 401 max_low = max_high = 0; 402 403 find_limits(&min, &max_low, &max_high); 404 405 arm_bootmem_init(min, max_low); 406 407 /* 408 * Sparsemem tries to allocate bootmem in memory_present(), 409 * so must be done after the fixed reservations 410 */ 411 arm_memory_present(); 412 413 /* 414 * sparse_init() needs the bootmem allocator up and running. 415 */ 416 sparse_init(); 417 418 /* 419 * Now free the memory - free_area_init_node needs 420 * the sparse mem_map arrays initialized by sparse_init() 421 * for memmap_init_zone(), otherwise all PFNs are invalid. 422 */ 423 arm_bootmem_free(min, max_low, max_high); 424 425 /* 426 * This doesn't seem to be used by the Linux memory manager any 427 * more, but is used by ll_rw_block. If we can get rid of it, we 428 * also get rid of some of the stuff above as well. 429 * 430 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 431 * the system, not the maximum PFN. 432 */ 433 max_low_pfn = max_low - PHYS_PFN_OFFSET; 434 max_pfn = max_high - PHYS_PFN_OFFSET; 435 } 436 437 /* 438 * Poison init memory with an undefined instruction (ARM) or a branch to an 439 * undefined instruction (Thumb). 440 */ 441 static inline void poison_init_mem(void *s, size_t count) 442 { 443 u32 *p = (u32 *)s; 444 for (; count != 0; count -= 4) 445 *p++ = 0xe7fddef0; 446 } 447 448 static inline void 449 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 450 { 451 struct page *start_pg, *end_pg; 452 phys_addr_t pg, pgend; 453 454 /* 455 * Convert start_pfn/end_pfn to a struct page pointer. 456 */ 457 start_pg = pfn_to_page(start_pfn - 1) + 1; 458 end_pg = pfn_to_page(end_pfn - 1) + 1; 459 460 /* 461 * Convert to physical addresses, and 462 * round start upwards and end downwards. 463 */ 464 pg = PAGE_ALIGN(__pa(start_pg)); 465 pgend = __pa(end_pg) & PAGE_MASK; 466 467 /* 468 * If there are free pages between these, 469 * free the section of the memmap array. 470 */ 471 if (pg < pgend) 472 free_bootmem(pg, pgend - pg); 473 } 474 475 /* 476 * The mem_map array can get very big. Free the unused area of the memory map. 477 */ 478 static void __init free_unused_memmap(struct meminfo *mi) 479 { 480 unsigned long bank_start, prev_bank_end = 0; 481 unsigned int i; 482 483 /* 484 * This relies on each bank being in address order. 485 * The banks are sorted previously in bootmem_init(). 486 */ 487 for_each_bank(i, mi) { 488 struct membank *bank = &mi->bank[i]; 489 490 bank_start = bank_pfn_start(bank); 491 492 #ifdef CONFIG_SPARSEMEM 493 /* 494 * Take care not to free memmap entries that don't exist 495 * due to SPARSEMEM sections which aren't present. 496 */ 497 bank_start = min(bank_start, 498 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 499 #else 500 /* 501 * Align down here since the VM subsystem insists that the 502 * memmap entries are valid from the bank start aligned to 503 * MAX_ORDER_NR_PAGES. 504 */ 505 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES); 506 #endif 507 /* 508 * If we had a previous bank, and there is a space 509 * between the current bank and the previous, free it. 510 */ 511 if (prev_bank_end && prev_bank_end < bank_start) 512 free_memmap(prev_bank_end, bank_start); 513 514 /* 515 * Align up here since the VM subsystem insists that the 516 * memmap entries are valid from the bank end aligned to 517 * MAX_ORDER_NR_PAGES. 518 */ 519 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 520 } 521 522 #ifdef CONFIG_SPARSEMEM 523 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) 524 free_memmap(prev_bank_end, 525 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 526 #endif 527 } 528 529 #ifdef CONFIG_HIGHMEM 530 static inline void free_area_high(unsigned long pfn, unsigned long end) 531 { 532 for (; pfn < end; pfn++) 533 free_highmem_page(pfn_to_page(pfn)); 534 } 535 #endif 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 free_area_high(start, res_start); 573 start = res_end; 574 if (start == end) 575 break; 576 } 577 578 /* And now free anything which remains */ 579 if (start < end) 580 free_area_high(start, end); 581 } 582 #endif 583 } 584 585 /* 586 * mem_init() marks the free areas in the mem_map and tells us how much 587 * memory is free. This is done after various parts of the system have 588 * claimed their memory after the kernel image. 589 */ 590 void __init mem_init(void) 591 { 592 #ifdef CONFIG_HAVE_TCM 593 /* These pointers are filled in on TCM detection */ 594 extern u32 dtcm_end; 595 extern u32 itcm_end; 596 #endif 597 598 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 599 600 /* this will put all unused low memory onto the freelists */ 601 free_unused_memmap(&meminfo); 602 free_all_bootmem(); 603 604 #ifdef CONFIG_SA1111 605 /* now that our DMA memory is actually so designated, we can free it */ 606 free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); 607 #endif 608 609 free_highpages(); 610 611 mem_init_print_info(NULL); 612 613 #define MLK(b, t) b, t, ((t) - (b)) >> 10 614 #define MLM(b, t) b, t, ((t) - (b)) >> 20 615 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 616 617 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 618 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 619 #ifdef CONFIG_HAVE_TCM 620 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 621 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 622 #endif 623 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 624 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 625 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 626 #ifdef CONFIG_HIGHMEM 627 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 628 #endif 629 #ifdef CONFIG_MODULES 630 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 631 #endif 632 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 633 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 634 " .data : 0x%p" " - 0x%p" " (%4d kB)\n" 635 " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", 636 637 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 638 (PAGE_SIZE)), 639 #ifdef CONFIG_HAVE_TCM 640 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 641 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 642 #endif 643 MLK(FIXADDR_START, FIXADDR_TOP), 644 MLM(VMALLOC_START, VMALLOC_END), 645 MLM(PAGE_OFFSET, (unsigned long)high_memory), 646 #ifdef CONFIG_HIGHMEM 647 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 648 (PAGE_SIZE)), 649 #endif 650 #ifdef CONFIG_MODULES 651 MLM(MODULES_VADDR, MODULES_END), 652 #endif 653 654 MLK_ROUNDUP(_text, _etext), 655 MLK_ROUNDUP(__init_begin, __init_end), 656 MLK_ROUNDUP(_sdata, _edata), 657 MLK_ROUNDUP(__bss_start, __bss_stop)); 658 659 #undef MLK 660 #undef MLM 661 #undef MLK_ROUNDUP 662 663 /* 664 * Check boundaries twice: Some fundamental inconsistencies can 665 * be detected at build time already. 666 */ 667 #ifdef CONFIG_MMU 668 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 669 BUG_ON(TASK_SIZE > MODULES_VADDR); 670 #endif 671 672 #ifdef CONFIG_HIGHMEM 673 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 674 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 675 #endif 676 677 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 678 extern int sysctl_overcommit_memory; 679 /* 680 * On a machine this small we won't get 681 * anywhere without overcommit, so turn 682 * it on by default. 683 */ 684 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 685 } 686 } 687 688 void free_initmem(void) 689 { 690 #ifdef CONFIG_HAVE_TCM 691 extern char __tcm_start, __tcm_end; 692 693 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 694 free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); 695 #endif 696 697 poison_init_mem(__init_begin, __init_end - __init_begin); 698 if (!machine_is_integrator() && !machine_is_cintegrator()) 699 free_initmem_default(-1); 700 } 701 702 #ifdef CONFIG_BLK_DEV_INITRD 703 704 static int keep_initrd; 705 706 void free_initrd_mem(unsigned long start, unsigned long end) 707 { 708 if (!keep_initrd) { 709 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 710 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 711 } 712 } 713 714 static int __init keepinitrd_setup(char *__unused) 715 { 716 keep_initrd = 1; 717 return 1; 718 } 719 720 __setup("keepinitrd", keepinitrd_setup); 721 #endif 722