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/highmem.h> 19 #include <linux/gfp.h> 20 #include <linux/memblock.h> 21 #include <linux/sort.h> 22 23 #include <asm/mach-types.h> 24 #include <asm/sections.h> 25 #include <asm/setup.h> 26 #include <asm/sizes.h> 27 #include <asm/tlb.h> 28 #include <asm/fixmap.h> 29 30 #include <asm/mach/arch.h> 31 #include <asm/mach/map.h> 32 33 #include "mm.h" 34 35 static unsigned long phys_initrd_start __initdata = 0; 36 static unsigned long phys_initrd_size __initdata = 0; 37 38 static int __init early_initrd(char *p) 39 { 40 unsigned long start, size; 41 char *endp; 42 43 start = memparse(p, &endp); 44 if (*endp == ',') { 45 size = memparse(endp + 1, NULL); 46 47 phys_initrd_start = start; 48 phys_initrd_size = size; 49 } 50 return 0; 51 } 52 early_param("initrd", early_initrd); 53 54 static int __init parse_tag_initrd(const struct tag *tag) 55 { 56 printk(KERN_WARNING "ATAG_INITRD is deprecated; " 57 "please update your bootloader.\n"); 58 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 59 phys_initrd_size = tag->u.initrd.size; 60 return 0; 61 } 62 63 __tagtable(ATAG_INITRD, parse_tag_initrd); 64 65 static int __init parse_tag_initrd2(const struct tag *tag) 66 { 67 phys_initrd_start = tag->u.initrd.start; 68 phys_initrd_size = tag->u.initrd.size; 69 return 0; 70 } 71 72 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 73 74 /* 75 * This keeps memory configuration data used by a couple memory 76 * initialization functions, as well as show_mem() for the skipping 77 * of holes in the memory map. It is populated by arm_add_memory(). 78 */ 79 struct meminfo meminfo; 80 81 void show_mem(unsigned int filter) 82 { 83 int free = 0, total = 0, reserved = 0; 84 int shared = 0, cached = 0, slab = 0, i; 85 struct meminfo * mi = &meminfo; 86 87 printk("Mem-info:\n"); 88 show_free_areas(filter); 89 90 for_each_bank (i, mi) { 91 struct membank *bank = &mi->bank[i]; 92 unsigned int pfn1, pfn2; 93 struct page *page, *end; 94 95 pfn1 = bank_pfn_start(bank); 96 pfn2 = bank_pfn_end(bank); 97 98 page = pfn_to_page(pfn1); 99 end = pfn_to_page(pfn2 - 1) + 1; 100 101 do { 102 total++; 103 if (PageReserved(page)) 104 reserved++; 105 else if (PageSwapCache(page)) 106 cached++; 107 else if (PageSlab(page)) 108 slab++; 109 else if (!page_count(page)) 110 free++; 111 else 112 shared += page_count(page) - 1; 113 page++; 114 } while (page < end); 115 } 116 117 printk("%d pages of RAM\n", total); 118 printk("%d free pages\n", free); 119 printk("%d reserved pages\n", reserved); 120 printk("%d slab pages\n", slab); 121 printk("%d pages shared\n", shared); 122 printk("%d pages swap cached\n", cached); 123 } 124 125 static void __init find_limits(unsigned long *min, unsigned long *max_low, 126 unsigned long *max_high) 127 { 128 struct meminfo *mi = &meminfo; 129 int i; 130 131 *min = -1UL; 132 *max_low = *max_high = 0; 133 134 for_each_bank (i, mi) { 135 struct membank *bank = &mi->bank[i]; 136 unsigned long start, end; 137 138 start = bank_pfn_start(bank); 139 end = bank_pfn_end(bank); 140 141 if (*min > start) 142 *min = start; 143 if (*max_high < end) 144 *max_high = end; 145 if (bank->highmem) 146 continue; 147 if (*max_low < end) 148 *max_low = end; 149 } 150 } 151 152 static void __init arm_bootmem_init(unsigned long start_pfn, 153 unsigned long end_pfn) 154 { 155 struct memblock_region *reg; 156 unsigned int boot_pages; 157 phys_addr_t bitmap; 158 pg_data_t *pgdat; 159 160 /* 161 * Allocate the bootmem bitmap page. This must be in a region 162 * of memory which has already been mapped. 163 */ 164 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); 165 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, 166 __pfn_to_phys(end_pfn)); 167 168 /* 169 * Initialise the bootmem allocator, handing the 170 * memory banks over to bootmem. 171 */ 172 node_set_online(0); 173 pgdat = NODE_DATA(0); 174 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); 175 176 /* Free the lowmem regions from memblock into bootmem. */ 177 for_each_memblock(memory, reg) { 178 unsigned long start = memblock_region_memory_base_pfn(reg); 179 unsigned long end = memblock_region_memory_end_pfn(reg); 180 181 if (end >= end_pfn) 182 end = end_pfn; 183 if (start >= end) 184 break; 185 186 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT); 187 } 188 189 /* Reserve the lowmem memblock reserved regions in bootmem. */ 190 for_each_memblock(reserved, reg) { 191 unsigned long start = memblock_region_reserved_base_pfn(reg); 192 unsigned long end = memblock_region_reserved_end_pfn(reg); 193 194 if (end >= end_pfn) 195 end = end_pfn; 196 if (start >= end) 197 break; 198 199 reserve_bootmem(__pfn_to_phys(start), 200 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT); 201 } 202 } 203 204 #ifdef CONFIG_ZONE_DMA 205 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, 206 unsigned long dma_size) 207 { 208 if (size[0] <= dma_size) 209 return; 210 211 size[ZONE_NORMAL] = size[0] - dma_size; 212 size[ZONE_DMA] = dma_size; 213 hole[ZONE_NORMAL] = hole[0]; 214 hole[ZONE_DMA] = 0; 215 } 216 #endif 217 218 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low, 219 unsigned long max_high) 220 { 221 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 222 struct memblock_region *reg; 223 224 /* 225 * initialise the zones. 226 */ 227 memset(zone_size, 0, sizeof(zone_size)); 228 229 /* 230 * The memory size has already been determined. If we need 231 * to do anything fancy with the allocation of this memory 232 * to the zones, now is the time to do it. 233 */ 234 zone_size[0] = max_low - min; 235 #ifdef CONFIG_HIGHMEM 236 zone_size[ZONE_HIGHMEM] = max_high - max_low; 237 #endif 238 239 /* 240 * Calculate the size of the holes. 241 * holes = node_size - sum(bank_sizes) 242 */ 243 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 244 for_each_memblock(memory, reg) { 245 unsigned long start = memblock_region_memory_base_pfn(reg); 246 unsigned long end = memblock_region_memory_end_pfn(reg); 247 248 if (start < max_low) { 249 unsigned long low_end = min(end, max_low); 250 zhole_size[0] -= low_end - start; 251 } 252 #ifdef CONFIG_HIGHMEM 253 if (end > max_low) { 254 unsigned long high_start = max(start, max_low); 255 zhole_size[ZONE_HIGHMEM] -= end - high_start; 256 } 257 #endif 258 } 259 260 #ifdef ARM_DMA_ZONE_SIZE 261 #ifndef CONFIG_ZONE_DMA 262 #error ARM_DMA_ZONE_SIZE set but no DMA zone to limit allocations 263 #endif 264 265 /* 266 * Adjust the sizes according to any special requirements for 267 * this machine type. 268 */ 269 arm_adjust_dma_zone(zone_size, zhole_size, 270 ARM_DMA_ZONE_SIZE >> PAGE_SHIFT); 271 #endif 272 273 free_area_init_node(0, zone_size, min, zhole_size); 274 } 275 276 #ifndef CONFIG_SPARSEMEM 277 int pfn_valid(unsigned long pfn) 278 { 279 return memblock_is_memory(pfn << PAGE_SHIFT); 280 } 281 EXPORT_SYMBOL(pfn_valid); 282 283 static void arm_memory_present(void) 284 { 285 } 286 #else 287 static void arm_memory_present(void) 288 { 289 struct memblock_region *reg; 290 291 for_each_memblock(memory, reg) 292 memory_present(0, memblock_region_memory_base_pfn(reg), 293 memblock_region_memory_end_pfn(reg)); 294 } 295 #endif 296 297 static int __init meminfo_cmp(const void *_a, const void *_b) 298 { 299 const struct membank *a = _a, *b = _b; 300 long cmp = bank_pfn_start(a) - bank_pfn_start(b); 301 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; 302 } 303 304 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) 305 { 306 int i; 307 308 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL); 309 310 memblock_init(); 311 for (i = 0; i < mi->nr_banks; i++) 312 memblock_add(mi->bank[i].start, mi->bank[i].size); 313 314 /* Register the kernel text, kernel data and initrd with memblock. */ 315 #ifdef CONFIG_XIP_KERNEL 316 memblock_reserve(__pa(_sdata), _end - _sdata); 317 #else 318 memblock_reserve(__pa(_stext), _end - _stext); 319 #endif 320 #ifdef CONFIG_BLK_DEV_INITRD 321 if (phys_initrd_size && 322 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { 323 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n", 324 phys_initrd_start, phys_initrd_size); 325 phys_initrd_start = phys_initrd_size = 0; 326 } 327 if (phys_initrd_size) { 328 memblock_reserve(phys_initrd_start, phys_initrd_size); 329 330 /* Now convert initrd to virtual addresses */ 331 initrd_start = __phys_to_virt(phys_initrd_start); 332 initrd_end = initrd_start + phys_initrd_size; 333 } 334 #endif 335 336 arm_mm_memblock_reserve(); 337 338 /* reserve any platform specific memblock areas */ 339 if (mdesc->reserve) 340 mdesc->reserve(); 341 342 memblock_analyze(); 343 memblock_dump_all(); 344 } 345 346 void __init bootmem_init(void) 347 { 348 unsigned long min, max_low, max_high; 349 350 max_low = max_high = 0; 351 352 find_limits(&min, &max_low, &max_high); 353 354 arm_bootmem_init(min, max_low); 355 356 /* 357 * Sparsemem tries to allocate bootmem in memory_present(), 358 * so must be done after the fixed reservations 359 */ 360 arm_memory_present(); 361 362 /* 363 * sparse_init() needs the bootmem allocator up and running. 364 */ 365 sparse_init(); 366 367 /* 368 * Now free the memory - free_area_init_node needs 369 * the sparse mem_map arrays initialized by sparse_init() 370 * for memmap_init_zone(), otherwise all PFNs are invalid. 371 */ 372 arm_bootmem_free(min, max_low, max_high); 373 374 high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1; 375 376 /* 377 * This doesn't seem to be used by the Linux memory manager any 378 * more, but is used by ll_rw_block. If we can get rid of it, we 379 * also get rid of some of the stuff above as well. 380 * 381 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in 382 * the system, not the maximum PFN. 383 */ 384 max_low_pfn = max_low - PHYS_PFN_OFFSET; 385 max_pfn = max_high - PHYS_PFN_OFFSET; 386 } 387 388 static inline int free_area(unsigned long pfn, unsigned long end, char *s) 389 { 390 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); 391 392 for (; pfn < end; pfn++) { 393 struct page *page = pfn_to_page(pfn); 394 ClearPageReserved(page); 395 init_page_count(page); 396 __free_page(page); 397 pages++; 398 } 399 400 if (size && s) 401 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); 402 403 return pages; 404 } 405 406 static inline void 407 free_memmap(unsigned long start_pfn, unsigned long end_pfn) 408 { 409 struct page *start_pg, *end_pg; 410 unsigned long pg, pgend; 411 412 /* 413 * Convert start_pfn/end_pfn to a struct page pointer. 414 */ 415 start_pg = pfn_to_page(start_pfn - 1) + 1; 416 end_pg = pfn_to_page(end_pfn - 1) + 1; 417 418 /* 419 * Convert to physical addresses, and 420 * round start upwards and end downwards. 421 */ 422 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 423 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 424 425 /* 426 * If there are free pages between these, 427 * free the section of the memmap array. 428 */ 429 if (pg < pgend) 430 free_bootmem(pg, pgend - pg); 431 } 432 433 /* 434 * The mem_map array can get very big. Free the unused area of the memory map. 435 */ 436 static void __init free_unused_memmap(struct meminfo *mi) 437 { 438 unsigned long bank_start, prev_bank_end = 0; 439 unsigned int i; 440 441 /* 442 * This relies on each bank being in address order. 443 * The banks are sorted previously in bootmem_init(). 444 */ 445 for_each_bank(i, mi) { 446 struct membank *bank = &mi->bank[i]; 447 448 bank_start = bank_pfn_start(bank); 449 450 #ifdef CONFIG_SPARSEMEM 451 /* 452 * Take care not to free memmap entries that don't exist 453 * due to SPARSEMEM sections which aren't present. 454 */ 455 bank_start = min(bank_start, 456 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 457 #endif 458 /* 459 * If we had a previous bank, and there is a space 460 * between the current bank and the previous, free it. 461 */ 462 if (prev_bank_end && prev_bank_end < bank_start) 463 free_memmap(prev_bank_end, bank_start); 464 465 /* 466 * Align up here since the VM subsystem insists that the 467 * memmap entries are valid from the bank end aligned to 468 * MAX_ORDER_NR_PAGES. 469 */ 470 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); 471 } 472 473 #ifdef CONFIG_SPARSEMEM 474 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION)) 475 free_memmap(prev_bank_end, 476 ALIGN(prev_bank_end, PAGES_PER_SECTION)); 477 #endif 478 } 479 480 static void __init free_highpages(void) 481 { 482 #ifdef CONFIG_HIGHMEM 483 unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET; 484 struct memblock_region *mem, *res; 485 486 /* set highmem page free */ 487 for_each_memblock(memory, mem) { 488 unsigned long start = memblock_region_memory_base_pfn(mem); 489 unsigned long end = memblock_region_memory_end_pfn(mem); 490 491 /* Ignore complete lowmem entries */ 492 if (end <= max_low) 493 continue; 494 495 /* Truncate partial highmem entries */ 496 if (start < max_low) 497 start = max_low; 498 499 /* Find and exclude any reserved regions */ 500 for_each_memblock(reserved, res) { 501 unsigned long res_start, res_end; 502 503 res_start = memblock_region_reserved_base_pfn(res); 504 res_end = memblock_region_reserved_end_pfn(res); 505 506 if (res_end < start) 507 continue; 508 if (res_start < start) 509 res_start = start; 510 if (res_start > end) 511 res_start = end; 512 if (res_end > end) 513 res_end = end; 514 if (res_start != start) 515 totalhigh_pages += free_area(start, res_start, 516 NULL); 517 start = res_end; 518 if (start == end) 519 break; 520 } 521 522 /* And now free anything which remains */ 523 if (start < end) 524 totalhigh_pages += free_area(start, end, NULL); 525 } 526 totalram_pages += totalhigh_pages; 527 #endif 528 } 529 530 /* 531 * mem_init() marks the free areas in the mem_map and tells us how much 532 * memory is free. This is done after various parts of the system have 533 * claimed their memory after the kernel image. 534 */ 535 void __init mem_init(void) 536 { 537 unsigned long reserved_pages, free_pages; 538 struct memblock_region *reg; 539 int i; 540 #ifdef CONFIG_HAVE_TCM 541 /* These pointers are filled in on TCM detection */ 542 extern u32 dtcm_end; 543 extern u32 itcm_end; 544 #endif 545 546 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 547 548 /* this will put all unused low memory onto the freelists */ 549 free_unused_memmap(&meminfo); 550 551 totalram_pages += free_all_bootmem(); 552 553 #ifdef CONFIG_SA1111 554 /* now that our DMA memory is actually so designated, we can free it */ 555 totalram_pages += free_area(PHYS_PFN_OFFSET, 556 __phys_to_pfn(__pa(swapper_pg_dir)), NULL); 557 #endif 558 559 free_highpages(); 560 561 reserved_pages = free_pages = 0; 562 563 for_each_bank(i, &meminfo) { 564 struct membank *bank = &meminfo.bank[i]; 565 unsigned int pfn1, pfn2; 566 struct page *page, *end; 567 568 pfn1 = bank_pfn_start(bank); 569 pfn2 = bank_pfn_end(bank); 570 571 page = pfn_to_page(pfn1); 572 end = pfn_to_page(pfn2 - 1) + 1; 573 574 do { 575 if (PageReserved(page)) 576 reserved_pages++; 577 else if (!page_count(page)) 578 free_pages++; 579 page++; 580 } while (page < end); 581 } 582 583 /* 584 * Since our memory may not be contiguous, calculate the 585 * real number of pages we have in this system 586 */ 587 printk(KERN_INFO "Memory:"); 588 num_physpages = 0; 589 for_each_memblock(memory, reg) { 590 unsigned long pages = memblock_region_memory_end_pfn(reg) - 591 memblock_region_memory_base_pfn(reg); 592 num_physpages += pages; 593 printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); 594 } 595 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 596 597 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", 598 nr_free_pages() << (PAGE_SHIFT-10), 599 free_pages << (PAGE_SHIFT-10), 600 reserved_pages << (PAGE_SHIFT-10), 601 totalhigh_pages << (PAGE_SHIFT-10)); 602 603 #define MLK(b, t) b, t, ((t) - (b)) >> 10 604 #define MLM(b, t) b, t, ((t) - (b)) >> 20 605 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 606 607 printk(KERN_NOTICE "Virtual kernel memory layout:\n" 608 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" 609 #ifdef CONFIG_HAVE_TCM 610 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 611 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" 612 #endif 613 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" 614 #ifdef CONFIG_MMU 615 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" 616 #endif 617 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" 618 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" 619 #ifdef CONFIG_HIGHMEM 620 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" 621 #endif 622 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" 623 " .init : 0x%p" " - 0x%p" " (%4d kB)\n" 624 " .text : 0x%p" " - 0x%p" " (%4d kB)\n" 625 " .data : 0x%p" " - 0x%p" " (%4d kB)\n", 626 627 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + 628 (PAGE_SIZE)), 629 #ifdef CONFIG_HAVE_TCM 630 MLK(DTCM_OFFSET, (unsigned long) dtcm_end), 631 MLK(ITCM_OFFSET, (unsigned long) itcm_end), 632 #endif 633 MLK(FIXADDR_START, FIXADDR_TOP), 634 #ifdef CONFIG_MMU 635 MLM(CONSISTENT_BASE, CONSISTENT_END), 636 #endif 637 MLM(VMALLOC_START, VMALLOC_END), 638 MLM(PAGE_OFFSET, (unsigned long)high_memory), 639 #ifdef CONFIG_HIGHMEM 640 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * 641 (PAGE_SIZE)), 642 #endif 643 MLM(MODULES_VADDR, MODULES_END), 644 645 MLK_ROUNDUP(__init_begin, __init_end), 646 MLK_ROUNDUP(_text, _etext), 647 MLK_ROUNDUP(_sdata, _edata)); 648 649 #undef MLK 650 #undef MLM 651 #undef MLK_ROUNDUP 652 653 /* 654 * Check boundaries twice: Some fundamental inconsistencies can 655 * be detected at build time already. 656 */ 657 #ifdef CONFIG_MMU 658 BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); 659 BUG_ON(VMALLOC_END > CONSISTENT_BASE); 660 661 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 662 BUG_ON(TASK_SIZE > MODULES_VADDR); 663 #endif 664 665 #ifdef CONFIG_HIGHMEM 666 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 667 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); 668 #endif 669 670 if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 671 extern int sysctl_overcommit_memory; 672 /* 673 * On a machine this small we won't get 674 * anywhere without overcommit, so turn 675 * it on by default. 676 */ 677 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 678 } 679 } 680 681 void free_initmem(void) 682 { 683 #ifdef CONFIG_HAVE_TCM 684 extern char __tcm_start, __tcm_end; 685 686 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), 687 __phys_to_pfn(__pa(&__tcm_end)), 688 "TCM link"); 689 #endif 690 691 if (!machine_is_integrator() && !machine_is_cintegrator()) 692 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), 693 __phys_to_pfn(__pa(__init_end)), 694 "init"); 695 } 696 697 #ifdef CONFIG_BLK_DEV_INITRD 698 699 static int keep_initrd; 700 701 void free_initrd_mem(unsigned long start, unsigned long end) 702 { 703 if (!keep_initrd) 704 totalram_pages += free_area(__phys_to_pfn(__pa(start)), 705 __phys_to_pfn(__pa(end)), 706 "initrd"); 707 } 708 709 static int __init keepinitrd_setup(char *__unused) 710 { 711 keep_initrd = 1; 712 return 1; 713 } 714 715 __setup("keepinitrd", keepinitrd_setup); 716 #endif 717