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
  21 #include <asm/mach-types.h>
  22 #include <asm/sections.h>
  23 #include <asm/setup.h>
  24 #include <asm/sizes.h>
  25 #include <asm/tlb.h>
  26 #include <asm/fixmap.h>
  27
  28 #include <asm/mach/arch.h>
  29 #include <asm/mach/map.h>
  30
  31 #include "mm.h"
  32
  33 static unsigned long phys_initrd_start __initdata = 0;
  34 static unsigned long phys_initrd_size __initdata = 0;
  35
  36 static int __init early_initrd(char *p)
  37 {
  38         unsigned long start, size;
  39         char *endp;
  40
  41         start = memparse(p, &endp);
  42         if (*endp == ',') {
  43                 size = memparse(endp + 1, NULL);
  44
  45                 phys_initrd_start = start;
  46                 phys_initrd_size = size;
  47         }
  48         return 0;
  49 }
  50 early_param("initrd", early_initrd);
  51
  52 static int __init parse_tag_initrd(const struct tag *tag)
  53 {
  54         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
  55                 "please update your bootloader.\n");
  56         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  57         phys_initrd_size = tag->u.initrd.size;
  58         return 0;
  59 }
  60
  61 __tagtable(ATAG_INITRD, parse_tag_initrd);
  62
  63 static int __init parse_tag_initrd2(const struct tag *tag)
  64 {
  65         phys_initrd_start = tag->u.initrd.start;
  66         phys_initrd_size = tag->u.initrd.size;
  67         return 0;
  68 }
  69
  70 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  71
  72 /*
  73  * This keeps memory configuration data used by a couple memory
  74  * initialization functions, as well as show_mem() for the skipping
  75  * of holes in the memory map.  It is populated by arm_add_memory().
  76  */
  77 struct meminfo meminfo;
  78
  79 void show_mem(void)
  80 {
  81         int free = 0, total = 0, reserved = 0;
  82         int shared = 0, cached = 0, slab = 0, node, i;
  83         struct meminfo * mi = &meminfo;
  84
  85         printk("Mem-info:\n");
  86         show_free_areas();
  87         for_each_online_node(node) {
  88                 for_each_nodebank (i,mi,node) {
  89                         struct membank *bank = &mi->bank[i];
  90                         unsigned int pfn1, pfn2;
  91                         struct page *page, *end;
  92
  93                         pfn1 = bank_pfn_start(bank);
  94                         pfn2 = bank_pfn_end(bank);
  95
  96                         page = pfn_to_page(pfn1);
  97                         end  = pfn_to_page(pfn2 - 1) + 1;
  98
  99                         do {
 100                                 total++;
 101                                 if (PageReserved(page))
 102                                         reserved++;
 103                                 else if (PageSwapCache(page))
 104                                         cached++;
 105                                 else if (PageSlab(page))
 106                                         slab++;
 107                                 else if (!page_count(page))
 108                                         free++;
 109                                 else
 110                                         shared += page_count(page) - 1;
 111                                 page++;
 112                         } while (page < end);
 113                 }
 114         }
 115
 116         printk("%d pages of RAM\n", total);
 117         printk("%d free pages\n", free);
 118         printk("%d reserved pages\n", reserved);
 119         printk("%d slab pages\n", slab);
 120         printk("%d pages shared\n", shared);
 121         printk("%d pages swap cached\n", cached);
 122 }
 123
 124 static void __init find_node_limits(int node, struct meminfo *mi,
 125         unsigned long *min, unsigned long *max_low, unsigned long *max_high)
 126 {
 127         int i;
 128
 129         *min = -1UL;
 130         *max_low = *max_high = 0;
 131
 132         for_each_nodebank(i, mi, node) {
 133                 struct membank *bank = &mi->bank[i];
 134                 unsigned long start, end;
 135
 136                 start = bank_pfn_start(bank);
 137                 end = bank_pfn_end(bank);
 138
 139                 if (*min > start)
 140                         *min = start;
 141                 if (*max_high < end)
 142                         *max_high = end;
 143                 if (bank->highmem)
 144                         continue;
 145                 if (*max_low < end)
 146                         *max_low = end;
 147         }
 148 }
 149
 150 /*
 151  * FIXME: We really want to avoid allocating the bootmap bitmap
 152  * over the top of the initrd.  Hopefully, this is located towards
 153  * the start of a bank, so if we allocate the bootmap bitmap at
 154  * the end, we won't clash.
 155  */
 156 static unsigned int __init
 157 find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
 158 {
 159         unsigned int start_pfn, i, bootmap_pfn;
 160
 161         start_pfn   = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT;
 162         bootmap_pfn = 0;
 163
 164         for_each_nodebank(i, mi, node) {
 165                 struct membank *bank = &mi->bank[i];
 166                 unsigned int start, end;
 167
 168                 start = bank_pfn_start(bank);
 169                 end   = bank_pfn_end(bank);
 170
 171                 if (end < start_pfn)
 172                         continue;
 173
 174                 if (start < start_pfn)
 175                         start = start_pfn;
 176
 177                 if (end <= start)
 178                         continue;
 179
 180                 if (end - start >= bootmap_pages) {
 181                         bootmap_pfn = start;
 182                         break;
 183                 }
 184         }
 185
 186         if (bootmap_pfn == 0)
 187                 BUG();
 188
 189         return bootmap_pfn;
 190 }
 191
 192 static int __init check_initrd(struct meminfo *mi)
 193 {
 194         int initrd_node = -2;
 195 #ifdef CONFIG_BLK_DEV_INITRD
 196         unsigned long end = phys_initrd_start + phys_initrd_size;
 197
 198         /*
 199          * Make sure that the initrd is within a valid area of
 200          * memory.
 201          */
 202         if (phys_initrd_size) {
 203                 unsigned int i;
 204
 205                 initrd_node = -1;
 206
 207                 for (i = 0; i < mi->nr_banks; i++) {
 208                         struct membank *bank = &mi->bank[i];
 209                         if (bank_phys_start(bank) <= phys_initrd_start &&
 210                             end <= bank_phys_end(bank))
 211                                 initrd_node = bank->node;
 212                 }
 213         }
 214
 215         if (initrd_node == -1) {
 216                 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
 217                        "physical memory - disabling initrd\n",
 218                        phys_initrd_start, phys_initrd_size);
 219                 phys_initrd_start = phys_initrd_size = 0;
 220         }
 221 #endif
 222
 223         return initrd_node;
 224 }
 225
 226 static void __init bootmem_init_node(int node, struct meminfo *mi,
 227         unsigned long start_pfn, unsigned long end_pfn)
 228 {
 229         unsigned long boot_pfn;
 230         unsigned int boot_pages;
 231         pg_data_t *pgdat;
 232         int i;
 233
 234         /*
 235          * Allocate the bootmem bitmap page.
 236          */
 237         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 238         boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
 239
 240         /*
 241          * Initialise the bootmem allocator for this node, handing the
 242          * memory banks over to bootmem.
 243          */
 244         node_set_online(node);
 245         pgdat = NODE_DATA(node);
 246         init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
 247
 248         for_each_nodebank(i, mi, node) {
 249                 struct membank *bank = &mi->bank[i];
 250                 if (!bank->highmem)
 251                         free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
 252         }
 253
 254         /*
 255          * Reserve the bootmem bitmap for this node.
 256          */
 257         reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
 258                              boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
 259 }
 260
 261 static void __init bootmem_reserve_initrd(int node)
 262 {
 263 #ifdef CONFIG_BLK_DEV_INITRD
 264         pg_data_t *pgdat = NODE_DATA(node);
 265         int res;
 266
 267         res = reserve_bootmem_node(pgdat, phys_initrd_start,
 268                              phys_initrd_size, BOOTMEM_EXCLUSIVE);
 269
 270         if (res == 0) {
 271                 initrd_start = __phys_to_virt(phys_initrd_start);
 272                 initrd_end = initrd_start + phys_initrd_size;
 273         } else {
 274                 printk(KERN_ERR
 275                         "INITRD: 0x%08lx+0x%08lx overlaps in-use "
 276                         "memory region - disabling initrd\n",
 277                         phys_initrd_start, phys_initrd_size);
 278         }
 279 #endif
 280 }
 281
 282 static void __init bootmem_free_node(int node, struct meminfo *mi)
 283 {
 284         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 285         unsigned long min, max_low, max_high;
 286         int i;
 287
 288         find_node_limits(node, mi, &min, &max_low, &max_high);
 289
 290         /*
 291          * initialise the zones within this node.
 292          */
 293         memset(zone_size, 0, sizeof(zone_size));
 294
 295         /*
 296          * The size of this node has already been determined.  If we need
 297          * to do anything fancy with the allocation of this memory to the
 298          * zones, now is the time to do it.
 299          */
 300         zone_size[0] = max_low - min;
 301 #ifdef CONFIG_HIGHMEM
 302         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 303 #endif
 304
 305         /*
 306          * For each bank in this node, calculate the size of the holes.
 307          *  holes = node_size - sum(bank_sizes_in_node)
 308          */
 309         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 310         for_each_nodebank(i, mi, node) {
 311                 int idx = 0;
 312 #ifdef CONFIG_HIGHMEM
 313                 if (mi->bank[i].highmem)
 314                         idx = ZONE_HIGHMEM;
 315 #endif
 316                 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
 317         }
 318
 319         /*
 320          * Adjust the sizes according to any special requirements for
 321          * this machine type.
 322          */
 323         arch_adjust_zones(node, zone_size, zhole_size);
 324
 325         free_area_init_node(node, zone_size, min, zhole_size);
 326 }
 327
 328 #ifndef CONFIG_SPARSEMEM
 329 int pfn_valid(unsigned long pfn)
 330 {
 331         struct meminfo *mi = &meminfo;
 332         unsigned int left = 0, right = mi->nr_banks;
 333
 334         do {
 335                 unsigned int mid = (right + left) / 2;
 336                 struct membank *bank = &mi->bank[mid];
 337
 338                 if (pfn < bank_pfn_start(bank))
 339                         right = mid;
 340                 else if (pfn >= bank_pfn_end(bank))
 341                         left = mid + 1;
 342                 else
 343                         return 1;
 344         } while (left < right);
 345         return 0;
 346 }
 347 EXPORT_SYMBOL(pfn_valid);
 348
 349 static void arm_memory_present(struct meminfo *mi, int node)
 350 {
 351 }
 352 #else
 353 static void arm_memory_present(struct meminfo *mi, int node)
 354 {
 355         int i;
 356         for_each_nodebank(i, mi, node) {
 357                 struct membank *bank = &mi->bank[i];
 358                 memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
 359         }
 360 }
 361 #endif
 362
 363 void __init bootmem_init(void)
 364 {
 365         struct meminfo *mi = &meminfo;
 366         unsigned long min, max_low, max_high;
 367         int node, initrd_node;
 368
 369         /*
 370          * Locate which node contains the ramdisk image, if any.
 371          */
 372         initrd_node = check_initrd(mi);
 373
 374         max_low = max_high = 0;
 375
 376         /*
 377          * Run through each node initialising the bootmem allocator.
 378          */
 379         for_each_node(node) {
 380                 unsigned long node_low, node_high;
 381
 382                 find_node_limits(node, mi, &min, &node_low, &node_high);
 383
 384                 if (node_low > max_low)
 385                         max_low = node_low;
 386                 if (node_high > max_high)
 387                         max_high = node_high;
 388
 389                 /*
 390                  * If there is no memory in this node, ignore it.
 391                  * (We can't have nodes which have no lowmem)
 392                  */
 393                 if (node_low == 0)
 394                         continue;
 395
 396                 bootmem_init_node(node, mi, min, node_low);
 397
 398                 /*
 399                  * Reserve any special node zero regions.
 400                  */
 401                 if (node == 0)
 402                         reserve_node_zero(NODE_DATA(node));
 403
 404                 /*
 405                  * If the initrd is in this node, reserve its memory.
 406                  */
 407                 if (node == initrd_node)
 408                         bootmem_reserve_initrd(node);
 409
 410                 /*
 411                  * Sparsemem tries to allocate bootmem in memory_present(),
 412                  * so must be done after the fixed reservations
 413                  */
 414                 arm_memory_present(mi, node);
 415         }
 416
 417         /*
 418          * sparse_init() needs the bootmem allocator up and running.
 419          */
 420         sparse_init();
 421
 422         /*
 423          * Now free memory in each node - free_area_init_node needs
 424          * the sparse mem_map arrays initialized by sparse_init()
 425          * for memmap_init_zone(), otherwise all PFNs are invalid.
 426          */
 427         for_each_node(node)
 428                 bootmem_free_node(node, mi);
 429
 430         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
 431
 432         /*
 433          * This doesn't seem to be used by the Linux memory manager any
 434          * more, but is used by ll_rw_block.  If we can get rid of it, we
 435          * also get rid of some of the stuff above as well.
 436          *
 437          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 438          * the system, not the maximum PFN.
 439          */
 440         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 441         max_pfn = max_high - PHYS_PFN_OFFSET;
 442 }
 443
 444 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 445 {
 446         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 447
 448         for (; pfn < end; pfn++) {
 449                 struct page *page = pfn_to_page(pfn);
 450                 ClearPageReserved(page);
 451                 init_page_count(page);
 452                 __free_page(page);
 453                 pages++;
 454         }
 455
 456         if (size && s)
 457                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 458
 459         return pages;
 460 }
 461
 462 static inline void
 463 free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
 464 {
 465         struct page *start_pg, *end_pg;
 466         unsigned long pg, pgend;
 467
 468         /*
 469          * Convert start_pfn/end_pfn to a struct page pointer.
 470          */
 471         start_pg = pfn_to_page(start_pfn - 1) + 1;
 472         end_pg = pfn_to_page(end_pfn);
 473
 474         /*
 475          * Convert to physical addresses, and
 476          * round start upwards and end downwards.
 477          */
 478         pg = PAGE_ALIGN(__pa(start_pg));
 479         pgend = __pa(end_pg) & PAGE_MASK;
 480
 481         /*
 482          * If there are free pages between these,
 483          * free the section of the memmap array.
 484          */
 485         if (pg < pgend)
 486                 free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
 487 }
 488
 489 /*
 490  * The mem_map array can get very big.  Free the unused area of the memory map.
 491  */
 492 static void __init free_unused_memmap_node(int node, struct meminfo *mi)
 493 {
 494         unsigned long bank_start, prev_bank_end = 0;
 495         unsigned int i;
 496
 497         /*
 498          * [FIXME] This relies on each bank being in address order.  This
 499          * may not be the case, especially if the user has provided the
 500          * information on the command line.
 501          */
 502         for_each_nodebank(i, mi, node) {
 503                 struct membank *bank = &mi->bank[i];
 504
 505                 bank_start = bank_pfn_start(bank);
 506                 if (bank_start < prev_bank_end) {
 507                         printk(KERN_ERR "MEM: unordered memory banks.  "
 508                                 "Not freeing memmap.\n");
 509                         break;
 510                 }
 511
 512                 /*
 513                  * If we had a previous bank, and there is a space
 514                  * between the current bank and the previous, free it.
 515                  */
 516                 if (prev_bank_end && prev_bank_end != bank_start)
 517                         free_memmap(node, prev_bank_end, bank_start);
 518
 519                 prev_bank_end = bank_pfn_end(bank);
 520         }
 521 }
 522
 523 /*
 524  * mem_init() marks the free areas in the mem_map and tells us how much
 525  * memory is free.  This is done after various parts of the system have
 526  * claimed their memory after the kernel image.
 527  */
 528 void __init mem_init(void)
 529 {
 530         unsigned long reserved_pages, free_pages;
 531         int i, node;
 532
 533 #ifndef CONFIG_DISCONTIGMEM
 534         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 535 #endif
 536
 537         /* this will put all unused low memory onto the freelists */
 538         for_each_online_node(node) {
 539                 pg_data_t *pgdat = NODE_DATA(node);
 540
 541                 free_unused_memmap_node(node, &meminfo);
 542
 543                 if (pgdat->node_spanned_pages != 0)
 544                         totalram_pages += free_all_bootmem_node(pgdat);
 545         }
 546
 547 #ifdef CONFIG_SA1111
 548         /* now that our DMA memory is actually so designated, we can free it */
 549         totalram_pages += free_area(PHYS_PFN_OFFSET,
 550                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 551 #endif
 552
 553 #ifdef CONFIG_HIGHMEM
 554         /* set highmem page free */
 555         for_each_online_node(node) {
 556                 for_each_nodebank (i, &meminfo, node) {
 557                         unsigned long start = bank_pfn_start(&meminfo.bank[i]);
 558                         unsigned long end = bank_pfn_end(&meminfo.bank[i]);
 559                         if (start >= max_low_pfn + PHYS_PFN_OFFSET)
 560                                 totalhigh_pages += free_area(start, end, NULL);
 561                 }
 562         }
 563         totalram_pages += totalhigh_pages;
 564 #endif
 565
 566         reserved_pages = free_pages = 0;
 567
 568         for_each_online_node(node) {
 569                 for_each_nodebank(i, &meminfo, node) {
 570                         struct membank *bank = &meminfo.bank[i];
 571                         unsigned int pfn1, pfn2;
 572                         struct page *page, *end;
 573
 574                         pfn1 = bank_pfn_start(bank);
 575                         pfn2 = bank_pfn_end(bank);
 576
 577                         page = pfn_to_page(pfn1);
 578                         end  = pfn_to_page(pfn2 - 1) + 1;
 579
 580                         do {
 581                                 if (PageReserved(page))
 582                                         reserved_pages++;
 583                                 else if (!page_count(page))
 584                                         free_pages++;
 585                                 page++;
 586                         } while (page < end);
 587                 }
 588         }
 589
 590         /*
 591          * Since our memory may not be contiguous, calculate the
 592          * real number of pages we have in this system
 593          */
 594         printk(KERN_INFO "Memory:");
 595         num_physpages = 0;
 596         for (i = 0; i < meminfo.nr_banks; i++) {
 597                 num_physpages += bank_pfn_size(&meminfo.bank[i]);
 598                 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
 599         }
 600         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 601
 602         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 603                 nr_free_pages() << (PAGE_SHIFT-10),
 604                 free_pages << (PAGE_SHIFT-10),
 605                 reserved_pages << (PAGE_SHIFT-10),
 606                 totalhigh_pages << (PAGE_SHIFT-10));
 607
 608 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 609 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 610 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 611
 612         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 613                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 614                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 615 #ifdef CONFIG_MMU
 616                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 617 #endif
 618                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 619                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 620 #ifdef CONFIG_HIGHMEM
 621                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 622 #endif
 623                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 624                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 625                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 626                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 627
 628                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 629                                 (PAGE_SIZE)),
 630                         MLK(FIXADDR_START, FIXADDR_TOP),
 631 #ifdef CONFIG_MMU
 632                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 633 #endif
 634                         MLM(VMALLOC_START, VMALLOC_END),
 635                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 636 #ifdef CONFIG_HIGHMEM
 637                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 638                                 (PAGE_SIZE)),
 639 #endif
 640                         MLM(MODULES_VADDR, MODULES_END),
 641
 642                         MLK_ROUNDUP(__init_begin, __init_end),
 643                         MLK_ROUNDUP(_text, _etext),
 644                         MLK_ROUNDUP(_data, _edata));
 645
 646 #undef MLK
 647 #undef MLM
 648 #undef MLK_ROUNDUP
 649
 650         /*
 651          * Check boundaries twice: Some fundamental inconsistencies can
 652          * be detected at build time already.
 653          */
 654 #ifdef CONFIG_MMU
 655         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 656         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 657
 658         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 659         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 660 #endif
 661
 662 #ifdef CONFIG_HIGHMEM
 663         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 664         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 665 #endif
 666
 667         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 668                 extern int sysctl_overcommit_memory;
 669                 /*
 670                  * On a machine this small we won't get
 671                  * anywhere without overcommit, so turn
 672                  * it on by default.
 673                  */
 674                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 675         }
 676 }
 677
 678 void free_initmem(void)
 679 {
 680 #ifdef CONFIG_HAVE_TCM
 681         extern char __tcm_start, __tcm_end;
 682
 683         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 684                                     __phys_to_pfn(__pa(&__tcm_end)),
 685                                     "TCM link");
 686 #endif
 687
 688         if (!machine_is_integrator() && !machine_is_cintegrator())
 689                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 690                                             __phys_to_pfn(__pa(__init_end)),
 691                                             "init");
 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                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 702                                             __phys_to_pfn(__pa(end)),
 703                                             "initrd");
 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