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
  20 #include <asm/mach-types.h>
  21 #include <asm/sections.h>
  22 #include <asm/setup.h>
  23 #include <asm/sizes.h>
  24 #include <asm/tlb.h>
  25 #include <asm/fixmap.h>
  26
  27 #include <asm/mach/arch.h>
  28 #include <asm/mach/map.h>
  29
  30 #include "mm.h"
  31
  32 static unsigned long phys_initrd_start __initdata = 0;
  33 static unsigned long phys_initrd_size __initdata = 0;
  34
  35 static int __init early_initrd(char *p)
  36 {
  37         unsigned long start, size;
  38         char *endp;
  39
  40         start = memparse(p, &endp);
  41         if (*endp == ',') {
  42                 size = memparse(endp + 1, NULL);
  43
  44                 phys_initrd_start = start;
  45                 phys_initrd_size = size;
  46         }
  47         return 0;
  48 }
  49 early_param("initrd", early_initrd);
  50
  51 static int __init parse_tag_initrd(const struct tag *tag)
  52 {
  53         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
  54                 "please update your bootloader.\n");
  55         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  56         phys_initrd_size = tag->u.initrd.size;
  57         return 0;
  58 }
  59
  60 __tagtable(ATAG_INITRD, parse_tag_initrd);
  61
  62 static int __init parse_tag_initrd2(const struct tag *tag)
  63 {
  64         phys_initrd_start = tag->u.initrd.start;
  65         phys_initrd_size = tag->u.initrd.size;
  66         return 0;
  67 }
  68
  69 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  70
  71 /*
  72  * This keeps memory configuration data used by a couple memory
  73  * initialization functions, as well as show_mem() for the skipping
  74  * of holes in the memory map.  It is populated by arm_add_memory().
  75  */
  76 struct meminfo meminfo;
  77
  78 void show_mem(void)
  79 {
  80         int free = 0, total = 0, reserved = 0;
  81         int shared = 0, cached = 0, slab = 0, node, i;
  82         struct meminfo * mi = &meminfo;
  83
  84         printk("Mem-info:\n");
  85         show_free_areas();
  86         for_each_online_node(node) {
  87                 pg_data_t *n = NODE_DATA(node);
  88                 struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn;
  89
  90                 for_each_nodebank (i,mi,node) {
  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 = map + pfn1;
  99                         end  = map + pfn2;
 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
 118         printk("%d pages of RAM\n", total);
 119         printk("%d free pages\n", free);
 120         printk("%d reserved pages\n", reserved);
 121         printk("%d slab pages\n", slab);
 122         printk("%d pages shared\n", shared);
 123         printk("%d pages swap cached\n", cached);
 124 }
 125
 126 static void __init find_node_limits(int node, struct meminfo *mi,
 127         unsigned long *min, unsigned long *max_low, unsigned long *max_high)
 128 {
 129         int i;
 130
 131         *min = -1UL;
 132         *max_low = *max_high = 0;
 133
 134         for_each_nodebank(i, mi, node) {
 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 /*
 153  * FIXME: We really want to avoid allocating the bootmap bitmap
 154  * over the top of the initrd.  Hopefully, this is located towards
 155  * the start of a bank, so if we allocate the bootmap bitmap at
 156  * the end, we won't clash.
 157  */
 158 static unsigned int __init
 159 find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
 160 {
 161         unsigned int start_pfn, i, bootmap_pfn;
 162
 163         start_pfn   = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT;
 164         bootmap_pfn = 0;
 165
 166         for_each_nodebank(i, mi, node) {
 167                 struct membank *bank = &mi->bank[i];
 168                 unsigned int start, end;
 169
 170                 start = bank_pfn_start(bank);
 171                 end   = bank_pfn_end(bank);
 172
 173                 if (end < start_pfn)
 174                         continue;
 175
 176                 if (start < start_pfn)
 177                         start = start_pfn;
 178
 179                 if (end <= start)
 180                         continue;
 181
 182                 if (end - start >= bootmap_pages) {
 183                         bootmap_pfn = start;
 184                         break;
 185                 }
 186         }
 187
 188         if (bootmap_pfn == 0)
 189                 BUG();
 190
 191         return bootmap_pfn;
 192 }
 193
 194 static int __init check_initrd(struct meminfo *mi)
 195 {
 196         int initrd_node = -2;
 197 #ifdef CONFIG_BLK_DEV_INITRD
 198         unsigned long end = phys_initrd_start + phys_initrd_size;
 199
 200         /*
 201          * Make sure that the initrd is within a valid area of
 202          * memory.
 203          */
 204         if (phys_initrd_size) {
 205                 unsigned int i;
 206
 207                 initrd_node = -1;
 208
 209                 for (i = 0; i < mi->nr_banks; i++) {
 210                         struct membank *bank = &mi->bank[i];
 211                         if (bank_phys_start(bank) <= phys_initrd_start &&
 212                             end <= bank_phys_end(bank))
 213                                 initrd_node = bank->node;
 214                 }
 215         }
 216
 217         if (initrd_node == -1) {
 218                 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
 219                        "physical memory - disabling initrd\n",
 220                        phys_initrd_start, phys_initrd_size);
 221                 phys_initrd_start = phys_initrd_size = 0;
 222         }
 223 #endif
 224
 225         return initrd_node;
 226 }
 227
 228 static inline void map_memory_bank(struct membank *bank)
 229 {
 230 #ifdef CONFIG_MMU
 231         struct map_desc map;
 232
 233         map.pfn = bank_pfn_start(bank);
 234         map.virtual = __phys_to_virt(bank_phys_start(bank));
 235         map.length = bank_phys_size(bank);
 236         map.type = MT_MEMORY;
 237
 238         create_mapping(&map);
 239 #endif
 240 }
 241
 242 static void __init bootmem_init_node(int node, struct meminfo *mi,
 243         unsigned long start_pfn, unsigned long end_pfn)
 244 {
 245         unsigned long boot_pfn;
 246         unsigned int boot_pages;
 247         pg_data_t *pgdat;
 248         int i;
 249
 250         /*
 251          * Map the memory banks for this node.
 252          */
 253         for_each_nodebank(i, mi, node) {
 254                 struct membank *bank = &mi->bank[i];
 255
 256                 if (!bank->highmem)
 257                         map_memory_bank(bank);
 258         }
 259
 260         /*
 261          * Allocate the bootmem bitmap page.
 262          */
 263         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 264         boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
 265
 266         /*
 267          * Initialise the bootmem allocator for this node, handing the
 268          * memory banks over to bootmem.
 269          */
 270         node_set_online(node);
 271         pgdat = NODE_DATA(node);
 272         init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
 273
 274         for_each_nodebank(i, mi, node) {
 275                 struct membank *bank = &mi->bank[i];
 276                 if (!bank->highmem)
 277                         free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
 278         }
 279
 280         /*
 281          * Reserve the bootmem bitmap for this node.
 282          */
 283         reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
 284                              boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
 285 }
 286
 287 static void __init bootmem_reserve_initrd(int node)
 288 {
 289 #ifdef CONFIG_BLK_DEV_INITRD
 290         pg_data_t *pgdat = NODE_DATA(node);
 291         int res;
 292
 293         res = reserve_bootmem_node(pgdat, phys_initrd_start,
 294                              phys_initrd_size, BOOTMEM_EXCLUSIVE);
 295
 296         if (res == 0) {
 297                 initrd_start = __phys_to_virt(phys_initrd_start);
 298                 initrd_end = initrd_start + phys_initrd_size;
 299         } else {
 300                 printk(KERN_ERR
 301                         "INITRD: 0x%08lx+0x%08lx overlaps in-use "
 302                         "memory region - disabling initrd\n",
 303                         phys_initrd_start, phys_initrd_size);
 304         }
 305 #endif
 306 }
 307
 308 static void __init bootmem_free_node(int node, struct meminfo *mi)
 309 {
 310         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 311         unsigned long min, max_low, max_high;
 312         int i;
 313
 314         find_node_limits(node, mi, &min, &max_low, &max_high);
 315
 316         /*
 317          * initialise the zones within this node.
 318          */
 319         memset(zone_size, 0, sizeof(zone_size));
 320
 321         /*
 322          * The size of this node has already been determined.  If we need
 323          * to do anything fancy with the allocation of this memory to the
 324          * zones, now is the time to do it.
 325          */
 326         zone_size[0] = max_low - min;
 327 #ifdef CONFIG_HIGHMEM
 328         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 329 #endif
 330
 331         /*
 332          * For each bank in this node, calculate the size of the holes.
 333          *  holes = node_size - sum(bank_sizes_in_node)
 334          */
 335         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 336         for_each_nodebank(i, mi, node) {
 337                 int idx = 0;
 338 #ifdef CONFIG_HIGHMEM
 339                 if (mi->bank[i].highmem)
 340                         idx = ZONE_HIGHMEM;
 341 #endif
 342                 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
 343         }
 344
 345         /*
 346          * Adjust the sizes according to any special requirements for
 347          * this machine type.
 348          */
 349         arch_adjust_zones(node, zone_size, zhole_size);
 350
 351         free_area_init_node(node, zone_size, min, zhole_size);
 352 }
 353
 354 #ifndef CONFIG_SPARSEMEM
 355 int pfn_valid(unsigned long pfn)
 356 {
 357         struct meminfo *mi = &meminfo;
 358         unsigned int left = 0, right = mi->nr_banks;
 359
 360         do {
 361                 unsigned int mid = (right + left) / 2;
 362                 struct membank *bank = &mi->bank[mid];
 363
 364                 if (pfn < bank_pfn_start(bank))
 365                         right = mid;
 366                 else if (pfn >= bank_pfn_end(bank))
 367                         left = mid + 1;
 368                 else
 369                         return 1;
 370         } while (left < right);
 371         return 0;
 372 }
 373 EXPORT_SYMBOL(pfn_valid);
 374
 375 static void arm_memory_present(struct meminfo *mi, int node)
 376 {
 377 }
 378 #else
 379 static void arm_memory_present(struct meminfo *mi, int node)
 380 {
 381         int i;
 382         for_each_nodebank(i, mi, node) {
 383                 struct membank *bank = &mi->bank[i];
 384                 memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
 385         }
 386 }
 387 #endif
 388
 389 void __init bootmem_init(void)
 390 {
 391         struct meminfo *mi = &meminfo;
 392         unsigned long min, max_low, max_high;
 393         int node, initrd_node;
 394
 395         /*
 396          * Locate which node contains the ramdisk image, if any.
 397          */
 398         initrd_node = check_initrd(mi);
 399
 400         max_low = max_high = 0;
 401
 402         /*
 403          * Run through each node initialising the bootmem allocator.
 404          */
 405         for_each_node(node) {
 406                 unsigned long node_low, node_high;
 407
 408                 find_node_limits(node, mi, &min, &node_low, &node_high);
 409
 410                 if (node_low > max_low)
 411                         max_low = node_low;
 412                 if (node_high > max_high)
 413                         max_high = node_high;
 414
 415                 /*
 416                  * If there is no memory in this node, ignore it.
 417                  * (We can't have nodes which have no lowmem)
 418                  */
 419                 if (node_low == 0)
 420                         continue;
 421
 422                 bootmem_init_node(node, mi, min, node_low);
 423
 424                 /*
 425                  * Reserve any special node zero regions.
 426                  */
 427                 if (node == 0)
 428                         reserve_node_zero(NODE_DATA(node));
 429
 430                 /*
 431                  * If the initrd is in this node, reserve its memory.
 432                  */
 433                 if (node == initrd_node)
 434                         bootmem_reserve_initrd(node);
 435
 436                 /*
 437                  * Sparsemem tries to allocate bootmem in memory_present(),
 438                  * so must be done after the fixed reservations
 439                  */
 440                 arm_memory_present(mi, node);
 441         }
 442
 443         /*
 444          * sparse_init() needs the bootmem allocator up and running.
 445          */
 446         sparse_init();
 447
 448         /*
 449          * Now free memory in each node - free_area_init_node needs
 450          * the sparse mem_map arrays initialized by sparse_init()
 451          * for memmap_init_zone(), otherwise all PFNs are invalid.
 452          */
 453         for_each_node(node)
 454                 bootmem_free_node(node, mi);
 455
 456         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
 457
 458         /*
 459          * This doesn't seem to be used by the Linux memory manager any
 460          * more, but is used by ll_rw_block.  If we can get rid of it, we
 461          * also get rid of some of the stuff above as well.
 462          *
 463          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 464          * the system, not the maximum PFN.
 465          */
 466         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 467         max_pfn = max_high - PHYS_PFN_OFFSET;
 468 }
 469
 470 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 471 {
 472         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 473
 474         for (; pfn < end; pfn++) {
 475                 struct page *page = pfn_to_page(pfn);
 476                 ClearPageReserved(page);
 477                 init_page_count(page);
 478                 __free_page(page);
 479                 pages++;
 480         }
 481
 482         if (size && s)
 483                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 484
 485         return pages;
 486 }
 487
 488 static inline void
 489 free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
 490 {
 491         struct page *start_pg, *end_pg;
 492         unsigned long pg, pgend;
 493
 494         /*
 495          * Convert start_pfn/end_pfn to a struct page pointer.
 496          */
 497         start_pg = pfn_to_page(start_pfn - 1) + 1;
 498         end_pg = pfn_to_page(end_pfn);
 499
 500         /*
 501          * Convert to physical addresses, and
 502          * round start upwards and end downwards.
 503          */
 504         pg = PAGE_ALIGN(__pa(start_pg));
 505         pgend = __pa(end_pg) & PAGE_MASK;
 506
 507         /*
 508          * If there are free pages between these,
 509          * free the section of the memmap array.
 510          */
 511         if (pg < pgend)
 512                 free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
 513 }
 514
 515 /*
 516  * The mem_map array can get very big.  Free the unused area of the memory map.
 517  */
 518 static void __init free_unused_memmap_node(int node, struct meminfo *mi)
 519 {
 520         unsigned long bank_start, prev_bank_end = 0;
 521         unsigned int i;
 522
 523         /*
 524          * [FIXME] This relies on each bank being in address order.  This
 525          * may not be the case, especially if the user has provided the
 526          * information on the command line.
 527          */
 528         for_each_nodebank(i, mi, node) {
 529                 struct membank *bank = &mi->bank[i];
 530
 531                 bank_start = bank_pfn_start(bank);
 532                 if (bank_start < prev_bank_end) {
 533                         printk(KERN_ERR "MEM: unordered memory banks.  "
 534                                 "Not freeing memmap.\n");
 535                         break;
 536                 }
 537
 538                 /*
 539                  * If we had a previous bank, and there is a space
 540                  * between the current bank and the previous, free it.
 541                  */
 542                 if (prev_bank_end && prev_bank_end != bank_start)
 543                         free_memmap(node, prev_bank_end, bank_start);
 544
 545                 prev_bank_end = bank_pfn_end(bank);
 546         }
 547 }
 548
 549 /*
 550  * mem_init() marks the free areas in the mem_map and tells us how much
 551  * memory is free.  This is done after various parts of the system have
 552  * claimed their memory after the kernel image.
 553  */
 554 void __init mem_init(void)
 555 {
 556         unsigned long reserved_pages, free_pages;
 557         int i, node;
 558
 559 #ifndef CONFIG_DISCONTIGMEM
 560         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 561 #endif
 562
 563         /* this will put all unused low memory onto the freelists */
 564         for_each_online_node(node) {
 565                 pg_data_t *pgdat = NODE_DATA(node);
 566
 567                 free_unused_memmap_node(node, &meminfo);
 568
 569                 if (pgdat->node_spanned_pages != 0)
 570                         totalram_pages += free_all_bootmem_node(pgdat);
 571         }
 572
 573 #ifdef CONFIG_SA1111
 574         /* now that our DMA memory is actually so designated, we can free it */
 575         totalram_pages += free_area(PHYS_PFN_OFFSET,
 576                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 577 #endif
 578
 579 #ifdef CONFIG_HIGHMEM
 580         /* set highmem page free */
 581         for_each_online_node(node) {
 582                 for_each_nodebank (i, &meminfo, node) {
 583                         unsigned long start = bank_pfn_start(&meminfo.bank[i]);
 584                         unsigned long end = bank_pfn_end(&meminfo.bank[i]);
 585                         if (start >= max_low_pfn + PHYS_PFN_OFFSET)
 586                                 totalhigh_pages += free_area(start, end, NULL);
 587                 }
 588         }
 589         totalram_pages += totalhigh_pages;
 590 #endif
 591
 592         reserved_pages = free_pages = 0;
 593
 594         for_each_online_node(node) {
 595                 pg_data_t *n = NODE_DATA(node);
 596                 struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn;
 597
 598                 for_each_nodebank(i, &meminfo, node) {
 599                         struct membank *bank = &meminfo.bank[i];
 600                         unsigned int pfn1, pfn2;
 601                         struct page *page, *end;
 602
 603                         pfn1 = bank_pfn_start(bank);
 604                         pfn2 = bank_pfn_end(bank);
 605
 606                         page = map + pfn1;
 607                         end  = map + pfn2;
 608
 609                         do {
 610                                 if (PageReserved(page))
 611                                         reserved_pages++;
 612                                 else if (!page_count(page))
 613                                         free_pages++;
 614                                 page++;
 615                         } while (page < end);
 616                 }
 617         }
 618
 619         /*
 620          * Since our memory may not be contiguous, calculate the
 621          * real number of pages we have in this system
 622          */
 623         printk(KERN_INFO "Memory:");
 624         num_physpages = 0;
 625         for (i = 0; i < meminfo.nr_banks; i++) {
 626                 num_physpages += bank_pfn_size(&meminfo.bank[i]);
 627                 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
 628         }
 629         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 630
 631         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 632                 nr_free_pages() << (PAGE_SHIFT-10),
 633                 free_pages << (PAGE_SHIFT-10),
 634                 reserved_pages << (PAGE_SHIFT-10),
 635                 totalhigh_pages << (PAGE_SHIFT-10));
 636
 637 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 638 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 639 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 640
 641         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 642                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 643                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 644 #ifdef CONFIG_MMU
 645                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 646 #endif
 647                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 648                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 649 #ifdef CONFIG_HIGHMEM
 650                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 651 #endif
 652                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 653                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 654                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 655                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 656
 657                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 658                                 (PAGE_SIZE)),
 659                         MLK(FIXADDR_START, FIXADDR_TOP),
 660 #ifdef CONFIG_MMU
 661                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 662 #endif
 663                         MLM(VMALLOC_START, VMALLOC_END),
 664                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 665 #ifdef CONFIG_HIGHMEM
 666                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 667                                 (PAGE_SIZE)),
 668 #endif
 669                         MLM(MODULES_VADDR, MODULES_END),
 670
 671                         MLK_ROUNDUP(__init_begin, __init_end),
 672                         MLK_ROUNDUP(_text, _etext),
 673                         MLK_ROUNDUP(_data, _edata));
 674
 675 #undef MLK
 676 #undef MLM
 677 #undef MLK_ROUNDUP
 678
 679         /*
 680          * Check boundaries twice: Some fundamental inconsistencies can
 681          * be detected at build time already.
 682          */
 683 #ifdef CONFIG_MMU
 684         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 685         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 686
 687         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 688         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 689 #endif
 690
 691 #ifdef CONFIG_HIGHMEM
 692         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 693         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 694 #endif
 695
 696         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 697                 extern int sysctl_overcommit_memory;
 698                 /*
 699                  * On a machine this small we won't get
 700                  * anywhere without overcommit, so turn
 701                  * it on by default.
 702                  */
 703                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 704         }
 705 }
 706
 707 void free_initmem(void)
 708 {
 709 #ifdef CONFIG_HAVE_TCM
 710         extern char *__tcm_start, *__tcm_end;
 711
 712         totalram_pages += free_area(__phys_to_pfn(__pa(__tcm_start)),
 713                                     __phys_to_pfn(__pa(__tcm_end)),
 714                                     "TCM link");
 715 #endif
 716
 717         if (!machine_is_integrator() && !machine_is_cintegrator())
 718                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 719                                             __phys_to_pfn(__pa(__init_end)),
 720                                             "init");
 721 }
 722
 723 #ifdef CONFIG_BLK_DEV_INITRD
 724
 725 static int keep_initrd;
 726
 727 void free_initrd_mem(unsigned long start, unsigned long end)
 728 {
 729         if (!keep_initrd)
 730                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 731                                             __phys_to_pfn(__pa(end)),
 732                                             "initrd");
 733 }
 734
 735 static int __init keepinitrd_setup(char *__unused)
 736 {
 737         keep_initrd = 1;
 738         return 1;
 739 }
 740
 741 __setup("keepinitrd", keepinitrd_setup);
 742 #endif