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