arch/arm/mm/init.c

   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(void)
  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();
  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 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
 205         unsigned long max_high)
 206 {
 207         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 208         struct memblock_region *reg;
 209
 210         /*
 211          * initialise the zones.
 212          */
 213         memset(zone_size, 0, sizeof(zone_size));
 214
 215         /*
 216          * The memory size has already been determined.  If we need
 217          * to do anything fancy with the allocation of this memory
 218          * to the zones, now is the time to do it.
 219          */
 220         zone_size[0] = max_low - min;
 221 #ifdef CONFIG_HIGHMEM
 222         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 223 #endif
 224
 225         /*
 226          * Calculate the size of the holes.
 227          *  holes = node_size - sum(bank_sizes)
 228          */
 229         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 230         for_each_memblock(memory, reg) {
 231                 unsigned long start = memblock_region_memory_base_pfn(reg);
 232                 unsigned long end = memblock_region_memory_end_pfn(reg);
 233
 234                 if (start < max_low) {
 235                         unsigned long low_end = min(end, max_low);
 236                         zhole_size[0] -= low_end - start;
 237                 }
 238 #ifdef CONFIG_HIGHMEM
 239                 if (end > max_low) {
 240                         unsigned long high_start = max(start, max_low);
 241                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
 242                 }
 243 #endif
 244         }
 245
 246         /*
 247          * Adjust the sizes according to any special requirements for
 248          * this machine type.
 249          */
 250         arch_adjust_zones(zone_size, zhole_size);
 251
 252         free_area_init_node(0, zone_size, min, zhole_size);
 253 }
 254
 255 #ifndef CONFIG_SPARSEMEM
 256 int pfn_valid(unsigned long pfn)
 257 {
 258         return memblock_is_memory(pfn << PAGE_SHIFT);
 259 }
 260 EXPORT_SYMBOL(pfn_valid);
 261
 262 static void arm_memory_present(void)
 263 {
 264 }
 265 #else
 266 static void arm_memory_present(void)
 267 {
 268         struct memblock_region *reg;
 269
 270         for_each_memblock(memory, reg)
 271                 memory_present(0, memblock_region_memory_base_pfn(reg),
 272                                memblock_region_memory_end_pfn(reg));
 273 }
 274 #endif
 275
 276 static int __init meminfo_cmp(const void *_a, const void *_b)
 277 {
 278         const struct membank *a = _a, *b = _b;
 279         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
 280         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
 281 }
 282
 283 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 284 {
 285         int i;
 286
 287         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
 288
 289         memblock_init();
 290         for (i = 0; i < mi->nr_banks; i++)
 291                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 292
 293         /* Register the kernel text, kernel data and initrd with memblock. */
 294 #ifdef CONFIG_XIP_KERNEL
 295         memblock_reserve(__pa(_sdata), _end - _sdata);
 296 #else
 297         memblock_reserve(__pa(_stext), _end - _stext);
 298 #endif
 299 #ifdef CONFIG_BLK_DEV_INITRD
 300         if (phys_initrd_size) {
 301                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 302
 303                 /* Now convert initrd to virtual addresses */
 304                 initrd_start = __phys_to_virt(phys_initrd_start);
 305                 initrd_end = initrd_start + phys_initrd_size;
 306         }
 307 #endif
 308
 309         arm_mm_memblock_reserve();
 310
 311         /* reserve any platform specific memblock areas */
 312         if (mdesc->reserve)
 313                 mdesc->reserve();
 314
 315         memblock_analyze();
 316         memblock_dump_all();
 317 }
 318
 319 void __init bootmem_init(void)
 320 {
 321         unsigned long min, max_low, max_high;
 322
 323         max_low = max_high = 0;
 324
 325         find_limits(&min, &max_low, &max_high);
 326
 327         arm_bootmem_init(min, max_low);
 328
 329         /*
 330          * Sparsemem tries to allocate bootmem in memory_present(),
 331          * so must be done after the fixed reservations
 332          */
 333         arm_memory_present();
 334
 335         /*
 336          * sparse_init() needs the bootmem allocator up and running.
 337          */
 338         sparse_init();
 339
 340         /*
 341          * Now free the memory - free_area_init_node needs
 342          * the sparse mem_map arrays initialized by sparse_init()
 343          * for memmap_init_zone(), otherwise all PFNs are invalid.
 344          */
 345         arm_bootmem_free(min, max_low, max_high);
 346
 347         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
 348
 349         /*
 350          * This doesn't seem to be used by the Linux memory manager any
 351          * more, but is used by ll_rw_block.  If we can get rid of it, we
 352          * also get rid of some of the stuff above as well.
 353          *
 354          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 355          * the system, not the maximum PFN.
 356          */
 357         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 358         max_pfn = max_high - PHYS_PFN_OFFSET;
 359 }
 360
 361 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 362 {
 363         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 364
 365         for (; pfn < end; pfn++) {
 366                 struct page *page = pfn_to_page(pfn);
 367                 ClearPageReserved(page);
 368                 init_page_count(page);
 369                 __free_page(page);
 370                 pages++;
 371         }
 372
 373         if (size && s)
 374                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 375
 376         return pages;
 377 }
 378
 379 static inline void
 380 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 381 {
 382         struct page *start_pg, *end_pg;
 383         unsigned long pg, pgend;
 384
 385         /*
 386          * Convert start_pfn/end_pfn to a struct page pointer.
 387          */
 388         start_pg = pfn_to_page(start_pfn - 1) + 1;
 389         end_pg = pfn_to_page(end_pfn);
 390
 391         /*
 392          * Convert to physical addresses, and
 393          * round start upwards and end downwards.
 394          */
 395         pg = PAGE_ALIGN(__pa(start_pg));
 396         pgend = __pa(end_pg) & PAGE_MASK;
 397
 398         /*
 399          * If there are free pages between these,
 400          * free the section of the memmap array.
 401          */
 402         if (pg < pgend)
 403                 free_bootmem(pg, pgend - pg);
 404 }
 405
 406 /*
 407  * The mem_map array can get very big.  Free the unused area of the memory map.
 408  */
 409 static void __init free_unused_memmap(struct meminfo *mi)
 410 {
 411         unsigned long bank_start, prev_bank_end = 0;
 412         unsigned int i;
 413
 414         /*
 415          * This relies on each bank being in address order.
 416          * The banks are sorted previously in bootmem_init().
 417          */
 418         for_each_bank(i, mi) {
 419                 struct membank *bank = &mi->bank[i];
 420
 421                 bank_start = bank_pfn_start(bank);
 422
 423                 /*
 424                  * If we had a previous bank, and there is a space
 425                  * between the current bank and the previous, free it.
 426                  */
 427                 if (prev_bank_end && prev_bank_end < bank_start)
 428                         free_memmap(prev_bank_end, bank_start);
 429
 430                 /*
 431                  * Align up here since the VM subsystem insists that the
 432                  * memmap entries are valid from the bank end aligned to
 433                  * MAX_ORDER_NR_PAGES.
 434                  */
 435                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 436         }
 437 }
 438
 439 static void __init free_highpages(void)
 440 {
 441 #ifdef CONFIG_HIGHMEM
 442         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
 443         struct memblock_region *mem, *res;
 444
 445         /* set highmem page free */
 446         for_each_memblock(memory, mem) {
 447                 unsigned long start = memblock_region_memory_base_pfn(mem);
 448                 unsigned long end = memblock_region_memory_end_pfn(mem);
 449
 450                 /* Ignore complete lowmem entries */
 451                 if (end <= max_low)
 452                         continue;
 453
 454                 /* Truncate partial highmem entries */
 455                 if (start < max_low)
 456                         start = max_low;
 457
 458                 /* Find and exclude any reserved regions */
 459                 for_each_memblock(reserved, res) {
 460                         unsigned long res_start, res_end;
 461
 462                         res_start = memblock_region_reserved_base_pfn(res);
 463                         res_end = memblock_region_reserved_end_pfn(res);
 464
 465                         if (res_end < start)
 466                                 continue;
 467                         if (res_start < start)
 468                                 res_start = start;
 469                         if (res_start > end)
 470                                 res_start = end;
 471                         if (res_end > end)
 472                                 res_end = end;
 473                         if (res_start != start)
 474                                 totalhigh_pages += free_area(start, res_start,
 475                                                              NULL);
 476                         start = res_end;
 477                         if (start == end)
 478                                 break;
 479                 }
 480
 481                 /* And now free anything which remains */
 482                 if (start < end)
 483                         totalhigh_pages += free_area(start, end, NULL);
 484         }
 485         totalram_pages += totalhigh_pages;
 486 #endif
 487 }
 488
 489 /*
 490  * mem_init() marks the free areas in the mem_map and tells us how much
 491  * memory is free.  This is done after various parts of the system have
 492  * claimed their memory after the kernel image.
 493  */
 494 void __init mem_init(void)
 495 {
 496         unsigned long reserved_pages, free_pages;
 497         struct memblock_region *reg;
 498         int i;
 499 #ifdef CONFIG_HAVE_TCM
 500         /* These pointers are filled in on TCM detection */
 501         extern u32 dtcm_end;
 502         extern u32 itcm_end;
 503 #endif
 504
 505         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 506
 507         /* this will put all unused low memory onto the freelists */
 508         free_unused_memmap(&meminfo);
 509
 510         totalram_pages += free_all_bootmem();
 511
 512 #ifdef CONFIG_SA1111
 513         /* now that our DMA memory is actually so designated, we can free it */
 514         totalram_pages += free_area(PHYS_PFN_OFFSET,
 515                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 516 #endif
 517
 518         free_highpages();
 519
 520         reserved_pages = free_pages = 0;
 521
 522         for_each_bank(i, &meminfo) {
 523                 struct membank *bank = &meminfo.bank[i];
 524                 unsigned int pfn1, pfn2;
 525                 struct page *page, *end;
 526
 527                 pfn1 = bank_pfn_start(bank);
 528                 pfn2 = bank_pfn_end(bank);
 529
 530                 page = pfn_to_page(pfn1);
 531                 end  = pfn_to_page(pfn2 - 1) + 1;
 532
 533                 do {
 534                         if (PageReserved(page))
 535                                 reserved_pages++;
 536                         else if (!page_count(page))
 537                                 free_pages++;
 538                         page++;
 539                 } while (page < end);
 540         }
 541
 542         /*
 543          * Since our memory may not be contiguous, calculate the
 544          * real number of pages we have in this system
 545          */
 546         printk(KERN_INFO "Memory:");
 547         num_physpages = 0;
 548         for_each_memblock(memory, reg) {
 549                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 550                         memblock_region_memory_base_pfn(reg);
 551                 num_physpages += pages;
 552                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 553         }
 554         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 555
 556         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 557                 nr_free_pages() << (PAGE_SHIFT-10),
 558                 free_pages << (PAGE_SHIFT-10),
 559                 reserved_pages << (PAGE_SHIFT-10),
 560                 totalhigh_pages << (PAGE_SHIFT-10));
 561
 562 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 563 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 564 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 565
 566         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 567                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 568 #ifdef CONFIG_HAVE_TCM
 569                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 570                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 571 #endif
 572                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 573 #ifdef CONFIG_MMU
 574                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 575 #endif
 576                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 577                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 578 #ifdef CONFIG_HIGHMEM
 579                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 580 #endif
 581                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 582                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 583                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 584                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 585
 586                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 587                                 (PAGE_SIZE)),
 588 #ifdef CONFIG_HAVE_TCM
 589                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 590                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 591 #endif
 592                         MLK(FIXADDR_START, FIXADDR_TOP),
 593 #ifdef CONFIG_MMU
 594                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 595 #endif
 596                         MLM(VMALLOC_START, VMALLOC_END),
 597                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 598 #ifdef CONFIG_HIGHMEM
 599                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 600                                 (PAGE_SIZE)),
 601 #endif
 602                         MLM(MODULES_VADDR, MODULES_END),
 603
 604                         MLK_ROUNDUP(__init_begin, __init_end),
 605                         MLK_ROUNDUP(_text, _etext),
 606                         MLK_ROUNDUP(_sdata, _edata));
 607
 608 #undef MLK
 609 #undef MLM
 610 #undef MLK_ROUNDUP
 611
 612         /*
 613          * Check boundaries twice: Some fundamental inconsistencies can
 614          * be detected at build time already.
 615          */
 616 #ifdef CONFIG_MMU
 617         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 618         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 619
 620         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 621         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 622 #endif
 623
 624 #ifdef CONFIG_HIGHMEM
 625         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 626         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 627 #endif
 628
 629         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 630                 extern int sysctl_overcommit_memory;
 631                 /*
 632                  * On a machine this small we won't get
 633                  * anywhere without overcommit, so turn
 634                  * it on by default.
 635                  */
 636                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 637         }
 638 }
 639
 640 void free_initmem(void)
 641 {
 642 #ifdef CONFIG_HAVE_TCM
 643         extern char __tcm_start, __tcm_end;
 644
 645         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 646                                     __phys_to_pfn(__pa(&__tcm_end)),
 647                                     "TCM link");
 648 #endif
 649
 650         if (!machine_is_integrator() && !machine_is_cintegrator())
 651                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 652                                             __phys_to_pfn(__pa(__init_end)),
 653                                             "init");
 654 }
 655
 656 #ifdef CONFIG_BLK_DEV_INITRD
 657
 658 static int keep_initrd;
 659
 660 void free_initrd_mem(unsigned long start, unsigned long end)
 661 {
 662         if (!keep_initrd)
 663                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 664                                             __phys_to_pfn(__pa(end)),
 665                                             "initrd");
 666 }
 667
 668 static int __init keepinitrd_setup(char *__unused)
 669 {
 670         keep_initrd = 1;
 671         return 1;
 672 }
 673
 674 __setup("keepinitrd", keepinitrd_setup);
 675 #endif