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(unsigned long start, unsigned long 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 unsigned long 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; 221 222 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 223 unsigned long dma_size) 224 { 225 if (size[0] <= dma_size) 226 return; 227 228 size[ZONE_NORMAL] = size[0] - dma_size; 229 size[ZONE_DMA] = dma_size; 230 hole[ZONE_NORMAL] = hole[0]; 231 hole[ZONE_DMA] = 0; 232 } 233 #endif 234 235 void __init setup_dma_zone(struct machine_desc *mdesc) 236 { 237 #ifdef CONFIG_ZONE_DMA 238 if (mdesc->dma_zone_size) { 239 arm_dma_zone_size = mdesc->dma_zone_size; 240 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; 241 } else 242 arm_dma_limit = 0xffffffff; 243 #endif 244 } 245 246 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, 247 unsigned long max_high) 248 { 249 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 250 struct memblock_region *reg; 251 252 /* 253 * initialise the zones. 254 */ 255 memset(zone_size, 0, sizeof(zone_size)); 256 257 /* 258 * The memory size has already been determined. If we need 259 * to do anything fancy with the allocation of this memory 260 * to the zones, now is the time to do it. 261 */ 262 zone_size[0] = max_low - min; 263 #ifdef CONFIG_HIGHMEM 264 zone_size[ZONE_HIGHMEM] = max_high - max_low; 265 #endif 266 267 /* 268 * Calculate the size of the holes. 269 * holes = node_size - sum(bank_sizes) 270 */ 271 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 272 for_each_memblock(memory, reg) { 273 unsigned long start = memblock_region_memory_base_pfn(reg); 274 unsigned long end = memblock_region_memory_end_pfn(reg); 275 276 if (start < max_low) { 277 unsigned long low_end = min(end, max_low); 278 zhole_size[0] -= low_end - start; 279 } 280 #ifdef CONFIG_HIGHMEM 281 if (end > max_low) { 282 unsigned long high_start = max(start, max_low); 283 zhole_size[ZONE_HIGHMEM] -= end - high_start; 284 } 285 #endif 286 } 287 288 #ifdef CONFIG_ZONE_DMA 289 /* 290 * Adjust the sizes according to any special requirements for 291 * this machine type. 292 */ 293 if (arm_dma_zone_size) 294 arm_adjust_dma_zone(zone_size, zhole_size, 295 arm_dma_zone_size >> PAGE_SHIFT); 296 #endif 297 298 free_area_init_node(0, zone_size, min, zhole_size); 299 } 300 301 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 302 int pfn_valid(unsigned long pfn) 303 { 304 return memblock_is_memory(__pfn_to_phys(pfn)); 305 } 306 EXPORT_SYMBOL(pfn_valid); 307 #endif 308 309 #ifndef CONFIG_SPARSEMEM 310 static void __init arm_memory_present(void) 311 { 312 } 313 #else 314 static void __init arm_memory_present(void) 315 { 316 struct memblock_region *reg; 317 318 for_each_memblock(memory, reg) 319 memory_present(0, memblock_region_memory_base_pfn(reg), 320 memblock_region_memory_end_pfn(reg)); 321 } 322 #endif 323 324 static bool arm_memblock_steal_permitted = true; 325 326 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) 327 { 328 phys_addr_t phys; 329 330 BUG_ON(!arm_memblock_steal_permitted); 331 332 phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); 333 memblock_free(phys, size); 334 memblock_remove(phys, size); 335 336 return phys; 337 } 338 339 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) 340 { 341 int i; 342 343 for (i = 0; i < mi->nr_banks; i++) 344 memblock_add(mi->bank[i].start, mi->bank[i].size); 345 346 /* Register the kernel text, kernel data and initrd with memblock. */ 347 #ifdef CONFIG_XIP_KERNEL 348 memblock_reserve(__pa(_sdata), _end - _sdata); 349 #else 350 memblock_reserve(__pa(_stext), _end - _stext); 351 #endif 352 #ifdef CONFIG_BLK_DEV_INITRD 353 if (phys_initrd_size && 354 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 355 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", 356 (u64)phys_initrd_start, phys_initrd_size); 357 phys_initrd_start = phys_initrd_size = 0; 358 } 359 if (phys_initrd_size && 360 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 361 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", 362 (u64)phys_initrd_start, phys_initrd_size); 363 phys_initrd_start = phys_initrd_size = 0; 364 } 365 if (phys_initrd_size) { 366 memblock_reserve(phys_initrd_start, phys_initrd_size); 367 368 /* Now convert initrd to virtual addresses */ 369 initrd_start = __phys_to_virt(phys_initrd_start); 370 initrd_end = initrd_start + phys_initrd_size; 371 } 372 #endif 373 374 arm_mm_memblock_reserve(); 375 arm_dt_memblock_reserve(); 376 377 /* reserve any platform specific memblock areas */ 378 if (mdesc->reserve) 379 mdesc->reserve(); 380 381 early_init_dt_scan_reserved_mem(); 382 383 /* 384 * reserve memory for DMA contigouos allocations, 385 * must come from DMA area inside low memory 386 */ 387 dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit)); 388 389 arm_memblock_steal_permitted = false; 390 memblock_allow_resize(); 391 memblock_dump_all(); 392 } 393 394 void __init bootmem_init(void) 395 { 396 unsigned long min, max_low, max_high; 397 398 max_low = max_high = 0; 399 400 find_limits(&min, &max_low, &max_high); 401 402 arm_bootmem_init(min, max_low); 403 404 /* 405 * Sparsemem tries to allocate bootmem in memory_present(), 406 * so must be done after the fixed reservations 407 */ 408 arm_memory_present(); 409 410 /* 411 * sparse_init() needs the bootmem allocator up and running. 412 */ 413 sparse_init(); 414 415 /* 416 * Now free the memory - free_area_init_node needs 417 * the sparse mem_map arrays initialized by sparse_init() 418 * for memmap_init_zone(), otherwise all PFNs are invalid. 419 */ 420 arm_bootmem_free(min, max_low, max_high); 421 422 /* 423 * This doesn't seem to be used by the Linux memory manager any 424 * more, but is used by ll_rw_block. If we can get rid of it, we 425 * also get rid of some of the stuff above as well. 426 * 427 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 428 * the system, not the maximum PFN. 429 */ 430 max_low_pfn = max_low - PHYS_PFN_OFFSET; 431 max_pfn = max_high - PHYS_PFN_OFFSET; 432 } 433 434 /* 435 * Poison init memory with an undefined instruction (ARM) or a branch to an 436 * undefined instruction (Thumb). 437 */ 438 static inline void poison_init_mem(void *s, size_t count) 439 { 440 u32 *p = (u32 *)s; 441 for (; count != 0; count -= 4) 442 *p++ = 0xe7fddef0; 443 } 444 445 static inline void 446 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 447 { 448 struct page *start_pg, *end_pg; 449 phys_addr_t pg, pgend; 450 451 /* 452 * Convert start_pfn/end_pfn to a struct page pointer. 453 */ 454 start_pg = pfn_to_page(start_pfn - 1) + 1; 455 end_pg = pfn_to_page(end_pfn - 1) + 1; 456 457 /* 458 * Convert to physical addresses, and 459 * round start upwards and end downwards. 460 */ 461 pg = PAGE_ALIGN(__pa(start_pg)); 462 pgend = __pa(end_pg) & PAGE_MASK; 463 464 /* 465 * If there are free pages between these, 466 * free the section of the memmap array. 467 */ 468 if (pg < pgend) 469 free_bootmem(pg, pgend - pg); 470 } 471 472 /* 473 * The mem_map array can get very big. Free the unused area of the memory map. 474 */ 475 static void __init free_unused_memmap(struct meminfo *mi) 476 { 477 unsigned long bank_start, prev_bank_end = 0; 478 unsigned int i; 479 480 /* 481 * This relies on each bank being in address order. 482 * The banks are sorted previously in bootmem_init(). 483 */ 484 for_each_bank(i, mi) { 485 struct membank *bank = &mi->bank[i]; 486 487 bank_start = bank_pfn_start(bank); 488 489 #ifdef CONFIG_SPARSEMEM 490 /* 491 * Take care not to free memmap entries that don't exist 492 * due to SPARSEMEM sections which aren't present. 493 */ 494 bank_start = min(bank_start, 495 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 496 #else 497 /* 498 * Align down here since the VM subsystem insists that the 499 * memmap entries are valid from the bank start aligned to 500 * MAX_ORDER_NR_PAGES. 501 */ 502 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES); 503 #endif 504 /* 505 * If we had a previous bank, and there is a space 506 * between the current bank and the previous, free it. 507 */ 508 if (prev_bank_end && prev_bank_end < bank_start) 509 free_memmap(prev_bank_end, bank_start); 510 511 /* 512 * Align up here since the VM subsystem insists that the 513 * memmap entries are valid from the bank end aligned to 514 * MAX_ORDER_NR_PAGES. 515 */ 516 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 517 } 518 519 #ifdef CONFIG_SPARSEMEM 520 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) 521 free_memmap(prev_bank_end, 522 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 523 #endif 524 } 525 526 #ifdef CONFIG_HIGHMEM 527 static inline void free_area_high(unsigned long pfn, unsigned long end) 528 { 529 for (; pfn < end; pfn++) 530 free_highmem_page(pfn_to_page(pfn)); 531 } 532 #endif 533 534 static void __init free_highpages(void) 535 { 536 #ifdef CONFIG_HIGHMEM 537 unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; 538 struct memblock_region *mem, *res; 539 540 /* set highmem page free */ 541 for_each_memblock(memory, mem) { 542 unsigned long start = memblock_region_memory_base_pfn(mem); 543 unsigned long end = memblock_region_memory_end_pfn(mem); 544 545 /* Ignore complete lowmem entries */ 546 if (end <= max_low) 547 continue; 548 549 /* Truncate partial highmem entries */ 550 if (start < max_low) 551 start = max_low; 552 553 /* Find and exclude any reserved regions */ 554 for_each_memblock(reserved, res) { 555 unsigned long res_start, res_end; 556 557 res_start = memblock_region_reserved_base_pfn(res); 558 res_end = memblock_region_reserved_end_pfn(res); 559 560 if (res_end < start) 561 continue; 562 if (res_start < start) 563 res_start = start; 564 if (res_start > end) 565 res_start = end; 566 if (res_end > end) 567 res_end = end; 568 if (res_start != start) 569 free_area_high(start, res_start); 570 start = res_end; 571 if (start == end) 572 break; 573 } 574 575 /* And now free anything which remains */ 576 if (start < end) 577 free_area_high(start, end); 578 } 579 #endif 580 } 581 582 /* 583 * mem_init() marks the free areas in the mem_map and tells us how much 584 * memory is free. This is done after various parts of the system have 585 * claimed their memory after the kernel image. 586 */ 587 void __init mem_init(void) 588 { 589 #ifdef CONFIG_HAVE_TCM 590 /* These pointers are filled in on TCM detection */ 591 extern u32 dtcm_end; 592 extern u32 itcm_end; 593 #endif 594 595 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 596 597 /* this will put all unused low memory onto the freelists */ 598 free_unused_memmap(&meminfo); 599 free_all_bootmem(); 600 601 #ifdef CONFIG_SA1111 602 /* now that our DMA memory is actually so designated, we can free it */ 603 free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); 604 #endif 605 606 free_highpages(); 607 608 mem_init_print_info(NULL); 609 610 #define MLK(b, t) b, t, ((t) - (b)) >> 10 611 #define MLM(b, t) b, t, ((t) - (b)) >> 20 612 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 613 614 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 615 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 616 #ifdef CONFIG_HAVE_TCM 617 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 618 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 619 #endif 620 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 621 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 622 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 623 #ifdef CONFIG_HIGHMEM 624 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 625 #endif 626 #ifdef CONFIG_MODULES 627 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 628 #endif 629 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 630 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 631 " .data : 0x%p" " - 0x%p" " (%4d kB)\n" 632 " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", 633 634 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 635 (PAGE_SIZE)), 636 #ifdef CONFIG_HAVE_TCM 637 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 638 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 639 #endif 640 MLK(FIXADDR_START, FIXADDR_TOP), 641 MLM(VMALLOC_START, VMALLOC_END), 642 MLM(PAGE_OFFSET, (unsigned long)high_memory), 643 #ifdef CONFIG_HIGHMEM 644 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 645 (PAGE_SIZE)), 646 #endif 647 #ifdef CONFIG_MODULES 648 MLM(MODULES_VADDR, MODULES_END), 649 #endif 650 651 MLK_ROUNDUP(_text, _etext), 652 MLK_ROUNDUP(__init_begin, __init_end), 653 MLK_ROUNDUP(_sdata, _edata), 654 MLK_ROUNDUP(__bss_start, __bss_stop)); 655 656 #undef MLK 657 #undef MLM 658 #undef MLK_ROUNDUP 659 660 /* 661 * Check boundaries twice: Some fundamental inconsistencies can 662 * be detected at build time already. 663 */ 664 #ifdef CONFIG_MMU 665 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 666 BUG_ON(TASK_SIZE > MODULES_VADDR); 667 #endif 668 669 #ifdef CONFIG_HIGHMEM 670 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 671 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 672 #endif 673 674 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 675 extern int sysctl_overcommit_memory; 676 /* 677 * On a machine this small we won't get 678 * anywhere without overcommit, so turn 679 * it on by default. 680 */ 681 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 682 } 683 } 684 685 void free_initmem(void) 686 { 687 #ifdef CONFIG_HAVE_TCM 688 extern char __tcm_start, __tcm_end; 689 690 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 691 free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); 692 #endif 693 694 poison_init_mem(__init_begin, __init_end - __init_begin); 695 if (!machine_is_integrator() && !machine_is_cintegrator()) 696 free_initmem_default(-1); 697 } 698 699 #ifdef CONFIG_BLK_DEV_INITRD 700 701 static int keep_initrd; 702 703 void free_initrd_mem(unsigned long start, unsigned long end) 704 { 705 if (!keep_initrd) { 706 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 707 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 708 } 709 } 710 711 static int __init keepinitrd_setup(char *__unused) 712 { 713 keep_initrd = 1; 714 return 1; 715 } 716 717 __setup("keepinitrd", keepinitrd_setup); 718 #endif 719