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 #include <linux/dma-contiguous.h> 24 #include <linux/sizes.h> 25 26 #include <asm/mach-types.h> 27 #include <asm/memblock.h> 28 #include <asm/prom.h> 29 #include <asm/sections.h> 30 #include <asm/setup.h> 31 #include <asm/tlb.h> 32 #include <asm/fixmap.h> 33 34 #include <asm/mach/arch.h> 35 #include <asm/mach/map.h> 36 37 #include "mm.h" 38 39 static phys_addr_t phys_initrd_start __initdata = 0; 40 static unsigned long phys_initrd_size __initdata = 0; 41 42 static int __init early_initrd(char *p) 43 { 44 phys_addr_t start; 45 unsigned long size; 46 char *endp; 47 48 start = memparse(p, &endp); 49 if (*endp == ',') { 50 size = memparse(endp + 1, NULL); 51 52 phys_initrd_start = start; 53 phys_initrd_size = size; 54 } 55 return 0; 56 } 57 early_param("initrd", early_initrd); 58 59 static int __init parse_tag_initrd(const struct tag *tag) 60 { 61 printk(KERN_WARNING "ATAG_INITRD is deprecated; " 62 "please update your bootloader.\n"); 63 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 64 phys_initrd_size = tag->u.initrd.size; 65 return 0; 66 } 67 68 __tagtable(ATAG_INITRD, parse_tag_initrd); 69 70 static int __init parse_tag_initrd2(const struct tag *tag) 71 { 72 phys_initrd_start = tag->u.initrd.start; 73 phys_initrd_size = tag->u.initrd.size; 74 return 0; 75 } 76 77 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 78 79 /* 80 * This keeps memory configuration data used by a couple memory 81 * initialization functions, as well as show_mem() for the skipping 82 * of holes in the memory map. It is populated by arm_add_memory(). 83 */ 84 struct meminfo meminfo; 85 86 void show_mem(unsigned int filter) 87 { 88 int free = 0, total = 0, reserved = 0; 89 int shared = 0, cached = 0, slab = 0, i; 90 struct meminfo * mi = &meminfo; 91 92 printk("Mem-info:\n"); 93 show_free_areas(filter); 94 95 if (filter & SHOW_MEM_FILTER_PAGE_COUNT) 96 return; 97 98 for_each_bank (i, mi) { 99 struct membank *bank = &mi->bank[i]; 100 unsigned int pfn1, pfn2; 101 struct page *page, *end; 102 103 pfn1 = bank_pfn_start(bank); 104 pfn2 = bank_pfn_end(bank); 105 106 page = pfn_to_page(pfn1); 107 end = pfn_to_page(pfn2 - 1) + 1; 108 109 do { 110 total++; 111 if (PageReserved(page)) 112 reserved++; 113 else if (PageSwapCache(page)) 114 cached++; 115 else if (PageSlab(page)) 116 slab++; 117 else if (!page_count(page)) 118 free++; 119 else 120 shared += page_count(page) - 1; 121 page++; 122 } while (page < end); 123 } 124 125 printk("%d pages of RAM\n", total); 126 printk("%d free pages\n", free); 127 printk("%d reserved pages\n", reserved); 128 printk("%d slab pages\n", slab); 129 printk("%d pages shared\n", shared); 130 printk("%d pages swap cached\n", cached); 131 } 132 133 static void __init find_limits(unsigned long *min, unsigned long *max_low, 134 unsigned long *max_high) 135 { 136 struct meminfo *mi = &meminfo; 137 int i; 138 139 /* This assumes the meminfo array is properly sorted */ 140 *min = bank_pfn_start(&mi->bank[0]); 141 for_each_bank (i, mi) 142 if (mi->bank[i].highmem) 143 break; 144 *max_low = bank_pfn_end(&mi->bank[i - 1]); 145 *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]); 146 } 147 148 static void __init arm_bootmem_init(unsigned long start_pfn, 149 unsigned long end_pfn) 150 { 151 struct memblock_region *reg; 152 unsigned int boot_pages; 153 phys_addr_t bitmap; 154 pg_data_t *pgdat; 155 156 /* 157 * Allocate the bootmem bitmap page. This must be in a region 158 * of memory which has already been mapped. 159 */ 160 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 161 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, 162 __pfn_to_phys(end_pfn)); 163 164 /* 165 * Initialise the bootmem allocator, handing the 166 * memory banks over to bootmem. 167 */ 168 node_set_online(0); 169 pgdat = NODE_DATA(0); 170 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); 171 172 /* Free the lowmem regions from memblock into bootmem. */ 173 for_each_memblock(memory, reg) { 174 unsigned long start = memblock_region_memory_base_pfn(reg); 175 unsigned long end = memblock_region_memory_end_pfn(reg); 176 177 if (end >= end_pfn) 178 end = end_pfn; 179 if (start >= end) 180 break; 181 182 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); 183 } 184 185 /* Reserve the lowmem memblock reserved regions in bootmem. */ 186 for_each_memblock(reserved, reg) { 187 unsigned long start = memblock_region_reserved_base_pfn(reg); 188 unsigned long end = memblock_region_reserved_end_pfn(reg); 189 190 if (end >= end_pfn) 191 end = end_pfn; 192 if (start >= end) 193 break; 194 195 reserve_bootmem(__pfn_to_phys(start), 196 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); 197 } 198 } 199 200 #ifdef CONFIG_ZONE_DMA 201 202 phys_addr_t arm_dma_zone_size __read_mostly; 203 EXPORT_SYMBOL(arm_dma_zone_size); 204 205 /* 206 * The DMA mask corresponding to the maximum bus address allocatable 207 * using GFP_DMA. The default here places no restriction on DMA 208 * allocations. This must be the smallest DMA mask in the system, 209 * so a successful GFP_DMA allocation will always satisfy this. 210 */ 211 phys_addr_t arm_dma_limit; 212 unsigned long arm_dma_pfn_limit; 213 214 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 215 unsigned long dma_size) 216 { 217 if (size[0] <= dma_size) 218 return; 219 220 size[ZONE_NORMAL] = size[0] - dma_size; 221 size[ZONE_DMA] = dma_size; 222 hole[ZONE_NORMAL] = hole[0]; 223 hole[ZONE_DMA] = 0; 224 } 225 #endif 226 227 void __init setup_dma_zone(const struct machine_desc *mdesc) 228 { 229 #ifdef CONFIG_ZONE_DMA 230 if (mdesc->dma_zone_size) { 231 arm_dma_zone_size = mdesc->dma_zone_size; 232 arm_dma_limit = __pv_phys_offset + arm_dma_zone_size - 1; 233 } else 234 arm_dma_limit = 0xffffffff; 235 arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; 236 #endif 237 } 238 239 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, 240 unsigned long max_high) 241 { 242 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 243 struct memblock_region *reg; 244 245 /* 246 * initialise the zones. 247 */ 248 memset(zone_size, 0, sizeof(zone_size)); 249 250 /* 251 * The memory size has already been determined. If we need 252 * to do anything fancy with the allocation of this memory 253 * to the zones, now is the time to do it. 254 */ 255 zone_size[0] = max_low - min; 256 #ifdef CONFIG_HIGHMEM 257 zone_size[ZONE_HIGHMEM] = max_high - max_low; 258 #endif 259 260 /* 261 * Calculate the size of the holes. 262 * holes = node_size - sum(bank_sizes) 263 */ 264 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 265 for_each_memblock(memory, reg) { 266 unsigned long start = memblock_region_memory_base_pfn(reg); 267 unsigned long end = memblock_region_memory_end_pfn(reg); 268 269 if (start < max_low) { 270 unsigned long low_end = min(end, max_low); 271 zhole_size[0] -= low_end - start; 272 } 273 #ifdef CONFIG_HIGHMEM 274 if (end > max_low) { 275 unsigned long high_start = max(start, max_low); 276 zhole_size[ZONE_HIGHMEM] -= end - high_start; 277 } 278 #endif 279 } 280 281 #ifdef CONFIG_ZONE_DMA 282 /* 283 * Adjust the sizes according to any special requirements for 284 * this machine type. 285 */ 286 if (arm_dma_zone_size) 287 arm_adjust_dma_zone(zone_size, zhole_size, 288 arm_dma_zone_size >> PAGE_SHIFT); 289 #endif 290 291 free_area_init_node(0, zone_size, min, zhole_size); 292 } 293 294 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 295 int pfn_valid(unsigned long pfn) 296 { 297 return memblock_is_memory(__pfn_to_phys(pfn)); 298 } 299 EXPORT_SYMBOL(pfn_valid); 300 #endif 301 302 #ifndef CONFIG_SPARSEMEM 303 static void __init arm_memory_present(void) 304 { 305 } 306 #else 307 static void __init arm_memory_present(void) 308 { 309 struct memblock_region *reg; 310 311 for_each_memblock(memory, reg) 312 memory_present(0, memblock_region_memory_base_pfn(reg), 313 memblock_region_memory_end_pfn(reg)); 314 } 315 #endif 316 317 static bool arm_memblock_steal_permitted = true; 318 319 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) 320 { 321 phys_addr_t phys; 322 323 BUG_ON(!arm_memblock_steal_permitted); 324 325 phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); 326 memblock_free(phys, size); 327 memblock_remove(phys, size); 328 329 return phys; 330 } 331 332 void __init arm_memblock_init(struct meminfo *mi, 333 const struct machine_desc *mdesc) 334 { 335 int i; 336 337 for (i = 0; i < mi->nr_banks; i++) 338 memblock_add(mi->bank[i].start, mi->bank[i].size); 339 340 /* Register the kernel text, kernel data and initrd with memblock. */ 341 #ifdef CONFIG_XIP_KERNEL 342 memblock_reserve(__pa(_sdata), _end - _sdata); 343 #else 344 memblock_reserve(__pa(_stext), _end - _stext); 345 #endif 346 #ifdef CONFIG_BLK_DEV_INITRD 347 /* FDT scan will populate initrd_start */ 348 if (initrd_start) { 349 phys_initrd_start = __virt_to_phys(initrd_start); 350 phys_initrd_size = initrd_end - initrd_start; 351 } 352 if (phys_initrd_size && 353 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { 354 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", 355 (u64)phys_initrd_start, phys_initrd_size); 356 phys_initrd_start = phys_initrd_size = 0; 357 } 358 if (phys_initrd_size && 359 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 360 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", 361 (u64)phys_initrd_start, phys_initrd_size); 362 phys_initrd_start = phys_initrd_size = 0; 363 } 364 if (phys_initrd_size) { 365 memblock_reserve(phys_initrd_start, phys_initrd_size); 366 367 /* Now convert initrd to virtual addresses */ 368 initrd_start = __phys_to_virt(phys_initrd_start); 369 initrd_end = initrd_start + phys_initrd_size; 370 } 371 #endif 372 373 arm_mm_memblock_reserve(); 374 arm_dt_memblock_reserve(); 375 376 /* reserve any platform specific memblock areas */ 377 if (mdesc->reserve) 378 mdesc->reserve(); 379 380 /* 381 * reserve memory for DMA contigouos allocations, 382 * must come from DMA area inside low memory 383 */ 384 dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit)); 385 386 arm_memblock_steal_permitted = false; 387 memblock_allow_resize(); 388 memblock_dump_all(); 389 } 390 391 void __init bootmem_init(void) 392 { 393 unsigned long min, max_low, max_high; 394 395 max_low = max_high = 0; 396 397 find_limits(&min, &max_low, &max_high); 398 399 arm_bootmem_init(min, max_low); 400 401 /* 402 * Sparsemem tries to allocate bootmem in memory_present(), 403 * so must be done after the fixed reservations 404 */ 405 arm_memory_present(); 406 407 /* 408 * sparse_init() needs the bootmem allocator up and running. 409 */ 410 sparse_init(); 411 412 /* 413 * Now free the memory - free_area_init_node needs 414 * the sparse mem_map arrays initialized by sparse_init() 415 * for memmap_init_zone(), otherwise all PFNs are invalid. 416 */ 417 arm_bootmem_free(min, max_low, max_high); 418 419 /* 420 * This doesn't seem to be used by the Linux memory manager any 421 * more, but is used by ll_rw_block. If we can get rid of it, we 422 * also get rid of some of the stuff above as well. 423 */ 424 min_low_pfn = min; 425 max_low_pfn = max_low; 426 max_pfn = max_high; 427 } 428 429 /* 430 * Poison init memory with an undefined instruction (ARM) or a branch to an 431 * undefined instruction (Thumb). 432 */ 433 static inline void poison_init_mem(void *s, size_t count) 434 { 435 u32 *p = (u32 *)s; 436 for (; count != 0; count -= 4) 437 *p++ = 0xe7fddef0; 438 } 439 440 static inline void 441 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 442 { 443 struct page *start_pg, *end_pg; 444 phys_addr_t pg, pgend; 445 446 /* 447 * Convert start_pfn/end_pfn to a struct page pointer. 448 */ 449 start_pg = pfn_to_page(start_pfn - 1) + 1; 450 end_pg = pfn_to_page(end_pfn - 1) + 1; 451 452 /* 453 * Convert to physical addresses, and 454 * round start upwards and end downwards. 455 */ 456 pg = PAGE_ALIGN(__pa(start_pg)); 457 pgend = __pa(end_pg) & PAGE_MASK; 458 459 /* 460 * If there are free pages between these, 461 * free the section of the memmap array. 462 */ 463 if (pg < pgend) 464 free_bootmem(pg, pgend - pg); 465 } 466 467 /* 468 * The mem_map array can get very big. Free the unused area of the memory map. 469 */ 470 static void __init free_unused_memmap(struct meminfo *mi) 471 { 472 unsigned long bank_start, prev_bank_end = 0; 473 unsigned int i; 474 475 /* 476 * This relies on each bank being in address order. 477 * The banks are sorted previously in bootmem_init(). 478 */ 479 for_each_bank(i, mi) { 480 struct membank *bank = &mi->bank[i]; 481 482 bank_start = bank_pfn_start(bank); 483 484 #ifdef CONFIG_SPARSEMEM 485 /* 486 * Take care not to free memmap entries that don't exist 487 * due to SPARSEMEM sections which aren't present. 488 */ 489 bank_start = min(bank_start, 490 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 491 #else 492 /* 493 * Align down here since the VM subsystem insists that the 494 * memmap entries are valid from the bank start aligned to 495 * MAX_ORDER_NR_PAGES. 496 */ 497 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES); 498 #endif 499 /* 500 * If we had a previous bank, and there is a space 501 * between the current bank and the previous, free it. 502 */ 503 if (prev_bank_end && prev_bank_end < bank_start) 504 free_memmap(prev_bank_end, bank_start); 505 506 /* 507 * Align up here since the VM subsystem insists that the 508 * memmap entries are valid from the bank end aligned to 509 * MAX_ORDER_NR_PAGES. 510 */ 511 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 512 } 513 514 #ifdef CONFIG_SPARSEMEM 515 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) 516 free_memmap(prev_bank_end, 517 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 518 #endif 519 } 520 521 #ifdef CONFIG_HIGHMEM 522 static inline void free_area_high(unsigned long pfn, unsigned long end) 523 { 524 for (; pfn < end; pfn++) 525 free_highmem_page(pfn_to_page(pfn)); 526 } 527 #endif 528 529 static void __init free_highpages(void) 530 { 531 #ifdef CONFIG_HIGHMEM 532 unsigned long max_low = max_low_pfn; 533 struct memblock_region *mem, *res; 534 535 /* set highmem page free */ 536 for_each_memblock(memory, mem) { 537 unsigned long start = memblock_region_memory_base_pfn(mem); 538 unsigned long end = memblock_region_memory_end_pfn(mem); 539 540 /* Ignore complete lowmem entries */ 541 if (end <= max_low) 542 continue; 543 544 /* Truncate partial highmem entries */ 545 if (start < max_low) 546 start = max_low; 547 548 /* Find and exclude any reserved regions */ 549 for_each_memblock(reserved, res) { 550 unsigned long res_start, res_end; 551 552 res_start = memblock_region_reserved_base_pfn(res); 553 res_end = memblock_region_reserved_end_pfn(res); 554 555 if (res_end < start) 556 continue; 557 if (res_start < start) 558 res_start = start; 559 if (res_start > end) 560 res_start = end; 561 if (res_end > end) 562 res_end = end; 563 if (res_start != start) 564 free_area_high(start, res_start); 565 start = res_end; 566 if (start == end) 567 break; 568 } 569 570 /* And now free anything which remains */ 571 if (start < end) 572 free_area_high(start, end); 573 } 574 #endif 575 } 576 577 /* 578 * mem_init() marks the free areas in the mem_map and tells us how much 579 * memory is free. This is done after various parts of the system have 580 * claimed their memory after the kernel image. 581 */ 582 void __init mem_init(void) 583 { 584 #ifdef CONFIG_HAVE_TCM 585 /* These pointers are filled in on TCM detection */ 586 extern u32 dtcm_end; 587 extern u32 itcm_end; 588 #endif 589 590 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 591 592 /* this will put all unused low memory onto the freelists */ 593 free_unused_memmap(&meminfo); 594 free_all_bootmem(); 595 596 #ifdef CONFIG_SA1111 597 /* now that our DMA memory is actually so designated, we can free it */ 598 free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); 599 #endif 600 601 free_highpages(); 602 603 mem_init_print_info(NULL); 604 605 #define MLK(b, t) b, t, ((t) - (b)) >> 10 606 #define MLM(b, t) b, t, ((t) - (b)) >> 20 607 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 608 609 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 610 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 611 #ifdef CONFIG_HAVE_TCM 612 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 613 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 614 #endif 615 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 616 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 617 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 618 #ifdef CONFIG_HIGHMEM 619 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 620 #endif 621 #ifdef CONFIG_MODULES 622 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 623 #endif 624 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 625 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 626 " .data : 0x%p" " - 0x%p" " (%4d kB)\n" 627 " .bss : 0x%p" " - 0x%p" " (%4d kB)\n", 628 629 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 630 (PAGE_SIZE)), 631 #ifdef CONFIG_HAVE_TCM 632 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 633 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 634 #endif 635 MLK(FIXADDR_START, FIXADDR_TOP), 636 MLM(VMALLOC_START, VMALLOC_END), 637 MLM(PAGE_OFFSET, (unsigned long)high_memory), 638 #ifdef CONFIG_HIGHMEM 639 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 640 (PAGE_SIZE)), 641 #endif 642 #ifdef CONFIG_MODULES 643 MLM(MODULES_VADDR, MODULES_END), 644 #endif 645 646 MLK_ROUNDUP(_text, _etext), 647 MLK_ROUNDUP(__init_begin, __init_end), 648 MLK_ROUNDUP(_sdata, _edata), 649 MLK_ROUNDUP(__bss_start, __bss_stop)); 650 651 #undef MLK 652 #undef MLM 653 #undef MLK_ROUNDUP 654 655 /* 656 * Check boundaries twice: Some fundamental inconsistencies can 657 * be detected at build time already. 658 */ 659 #ifdef CONFIG_MMU 660 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 661 BUG_ON(TASK_SIZE > MODULES_VADDR); 662 #endif 663 664 #ifdef CONFIG_HIGHMEM 665 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 666 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 667 #endif 668 669 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 670 extern int sysctl_overcommit_memory; 671 /* 672 * On a machine this small we won't get 673 * anywhere without overcommit, so turn 674 * it on by default. 675 */ 676 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 677 } 678 } 679 680 void free_initmem(void) 681 { 682 #ifdef CONFIG_HAVE_TCM 683 extern char __tcm_start, __tcm_end; 684 685 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); 686 free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); 687 #endif 688 689 poison_init_mem(__init_begin, __init_end - __init_begin); 690 if (!machine_is_integrator() && !machine_is_cintegrator()) 691 free_initmem_default(-1); 692 } 693 694 #ifdef CONFIG_BLK_DEV_INITRD 695 696 static int keep_initrd; 697 698 void free_initrd_mem(unsigned long start, unsigned long end) 699 { 700 if (!keep_initrd) { 701 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 702 free_reserved_area((void *)start, (void *)end, -1, "initrd"); 703 } 704 } 705 706 static int __init keepinitrd_setup(char *__unused) 707 { 708 keep_initrd = 1; 709 return 1; 710 } 711 712 __setup("keepinitrd", keepinitrd_setup); 713 #endif 714