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/sort.h>
  19 #include <linux/highmem.h>
  20 #include <linux/gfp.h>
  21
  22 #include <asm/mach-types.h>
  23 #include <asm/sections.h>
  24 #include <asm/setup.h>
  25 #include <asm/sizes.h>
  26 #include <asm/tlb.h>
  27 #include <asm/fixmap.h>
  28
  29 #include <asm/mach/arch.h>
  30 #include <asm/mach/map.h>
  31
  32 #include "mm.h"
  33
  34 static unsigned long phys_initrd_start __initdata = 0;
  35 static unsigned long phys_initrd_size __initdata = 0;
  36
  37 static int __init early_initrd(char *p)
  38 {
  39         unsigned long start, size;
  40         char *endp;
  41
  42         start = memparse(p, &endp);
  43         if (*endp == ',') {
  44                 size = memparse(endp + 1, NULL);
  45
  46                 phys_initrd_start = start;
  47                 phys_initrd_size = size;
  48         }
  49         return 0;
  50 }
  51 early_param("initrd", early_initrd);
  52
  53 static int __init parse_tag_initrd(const struct tag *tag)
  54 {
  55         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
  56                 "please update your bootloader.\n");
  57         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  58         phys_initrd_size = tag->u.initrd.size;
  59         return 0;
  60 }
  61
  62 __tagtable(ATAG_INITRD, parse_tag_initrd);
  63
  64 static int __init parse_tag_initrd2(const struct tag *tag)
  65 {
  66         phys_initrd_start = tag->u.initrd.start;
  67         phys_initrd_size = tag->u.initrd.size;
  68         return 0;
  69 }
  70
  71 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  72
  73 /*
  74  * This keeps memory configuration data used by a couple memory
  75  * initialization functions, as well as show_mem() for the skipping
  76  * of holes in the memory map.  It is populated by arm_add_memory().
  77  */
  78 struct meminfo meminfo;
  79
  80 void show_mem(void)
  81 {
  82         int free = 0, total = 0, reserved = 0;
  83         int shared = 0, cached = 0, slab = 0, node, i;
  84         struct meminfo * mi = &meminfo;
  85
  86         printk("Mem-info:\n");
  87         show_free_areas();
  88         for_each_online_node(node) {
  89                 for_each_nodebank (i,mi,node) {
  90                         struct membank *bank = &mi->bank[i];
  91                         unsigned int pfn1, pfn2;
  92                         struct page *page, *end;
  93
  94                         pfn1 = bank_pfn_start(bank);
  95                         pfn2 = bank_pfn_end(bank);
  96
  97                         page = pfn_to_page(pfn1);
  98                         end  = pfn_to_page(pfn2 - 1) + 1;
  99
 100                         do {
 101                                 total++;
 102                                 if (PageReserved(page))
 103                                         reserved++;
 104                                 else if (PageSwapCache(page))
 105                                         cached++;
 106                                 else if (PageSlab(page))
 107                                         slab++;
 108                                 else if (!page_count(page))
 109                                         free++;
 110                                 else
 111                                         shared += page_count(page) - 1;
 112                                 page++;
 113                         } while (page < end);
 114                 }
 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_node_limits(int node, struct meminfo *mi,
 126         unsigned long *min, unsigned long *max_low, unsigned long *max_high)
 127 {
 128         int i;
 129
 130         *min = -1UL;
 131         *max_low = *max_high = 0;
 132
 133         for_each_nodebank(i, mi, node) {
 134                 struct membank *bank = &mi->bank[i];
 135                 unsigned long start, end;
 136
 137                 start = bank_pfn_start(bank);
 138                 end = bank_pfn_end(bank);
 139
 140                 if (*min > start)
 141                         *min = start;
 142                 if (*max_high < end)
 143                         *max_high = end;
 144                 if (bank->highmem)
 145                         continue;
 146                 if (*max_low < end)
 147                         *max_low = end;
 148         }
 149 }
 150
 151 /*
 152  * FIXME: We really want to avoid allocating the bootmap bitmap
 153  * over the top of the initrd.  Hopefully, this is located towards
 154  * the start of a bank, so if we allocate the bootmap bitmap at
 155  * the end, we won't clash.
 156  */
 157 static unsigned int __init
 158 find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
 159 {
 160         unsigned int start_pfn, i, bootmap_pfn;
 161
 162         start_pfn   = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT;
 163         bootmap_pfn = 0;
 164
 165         for_each_nodebank(i, mi, node) {
 166                 struct membank *bank = &mi->bank[i];
 167                 unsigned int start, end;
 168
 169                 start = bank_pfn_start(bank);
 170                 end   = bank_pfn_end(bank);
 171
 172                 if (end < start_pfn)
 173                         continue;
 174
 175                 if (start < start_pfn)
 176                         start = start_pfn;
 177
 178                 if (end <= start)
 179                         continue;
 180
 181                 if (end - start >= bootmap_pages) {
 182                         bootmap_pfn = start;
 183                         break;
 184                 }
 185         }
 186
 187         if (bootmap_pfn == 0)
 188                 BUG();
 189
 190         return bootmap_pfn;
 191 }
 192
 193 static int __init check_initrd(struct meminfo *mi)
 194 {
 195         int initrd_node = -2;
 196 #ifdef CONFIG_BLK_DEV_INITRD
 197         unsigned long end = phys_initrd_start + phys_initrd_size;
 198
 199         /*
 200          * Make sure that the initrd is within a valid area of
 201          * memory.
 202          */
 203         if (phys_initrd_size) {
 204                 unsigned int i;
 205
 206                 initrd_node = -1;
 207
 208                 for (i = 0; i < mi->nr_banks; i++) {
 209                         struct membank *bank = &mi->bank[i];
 210                         if (bank_phys_start(bank) <= phys_initrd_start &&
 211                             end <= bank_phys_end(bank))
 212                                 initrd_node = bank->node;
 213                 }
 214         }
 215
 216         if (initrd_node == -1) {
 217                 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
 218                        "physical memory - disabling initrd\n",
 219                        phys_initrd_start, phys_initrd_size);
 220                 phys_initrd_start = phys_initrd_size = 0;
 221         }
 222 #endif
 223
 224         return initrd_node;
 225 }
 226
 227 static inline void map_memory_bank(struct membank *bank)
 228 {
 229 #ifdef CONFIG_MMU
 230         struct map_desc map;
 231
 232         map.pfn = bank_pfn_start(bank);
 233         map.virtual = __phys_to_virt(bank_phys_start(bank));
 234         map.length = bank_phys_size(bank);
 235         map.type = MT_MEMORY;
 236
 237         create_mapping(&map);
 238 #endif
 239 }
 240
 241 static void __init bootmem_init_node(int node, struct meminfo *mi,
 242         unsigned long start_pfn, unsigned long end_pfn)
 243 {
 244         unsigned long boot_pfn;
 245         unsigned int boot_pages;
 246         pg_data_t *pgdat;
 247         int i;
 248
 249         /*
 250          * Map the memory banks for this node.
 251          */
 252         for_each_nodebank(i, mi, node) {
 253                 struct membank *bank = &mi->bank[i];
 254
 255                 if (!bank->highmem)
 256                         map_memory_bank(bank);
 257         }
 258
 259         /*
 260          * Allocate the bootmem bitmap page.
 261          */
 262         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 263         boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
 264
 265         /*
 266          * Initialise the bootmem allocator for this node, handing the
 267          * memory banks over to bootmem.
 268          */
 269         node_set_online(node);
 270         pgdat = NODE_DATA(node);
 271         init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
 272
 273         for_each_nodebank(i, mi, node) {
 274                 struct membank *bank = &mi->bank[i];
 275                 if (!bank->highmem)
 276                         free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
 277         }
 278
 279         /*
 280          * Reserve the bootmem bitmap for this node.
 281          */
 282         reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
 283                              boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
 284 }
 285
 286 static void __init bootmem_reserve_initrd(int node)
 287 {
 288 #ifdef CONFIG_BLK_DEV_INITRD
 289         pg_data_t *pgdat = NODE_DATA(node);
 290         int res;
 291
 292         res = reserve_bootmem_node(pgdat, phys_initrd_start,
 293                              phys_initrd_size, BOOTMEM_EXCLUSIVE);
 294
 295         if (res == 0) {
 296                 initrd_start = __phys_to_virt(phys_initrd_start);
 297                 initrd_end = initrd_start + phys_initrd_size;
 298         } else {
 299                 printk(KERN_ERR
 300                         "INITRD: 0x%08lx+0x%08lx overlaps in-use "
 301                         "memory region - disabling initrd\n",
 302                         phys_initrd_start, phys_initrd_size);
 303         }
 304 #endif
 305 }
 306
 307 static void __init bootmem_free_node(int node, struct meminfo *mi)
 308 {
 309         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 310         unsigned long min, max_low, max_high;
 311         int i;
 312
 313         find_node_limits(node, mi, &min, &max_low, &max_high);
 314
 315         /*
 316          * initialise the zones within this node.
 317          */
 318         memset(zone_size, 0, sizeof(zone_size));
 319
 320         /*
 321          * The size of this node has already been determined.  If we need
 322          * to do anything fancy with the allocation of this memory to the
 323          * zones, now is the time to do it.
 324          */
 325         zone_size[0] = max_low - min;
 326 #ifdef CONFIG_HIGHMEM
 327         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 328 #endif
 329
 330         /*
 331          * For each bank in this node, calculate the size of the holes.
 332          *  holes = node_size - sum(bank_sizes_in_node)
 333          */
 334         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 335         for_each_nodebank(i, mi, node) {
 336                 int idx = 0;
 337 #ifdef CONFIG_HIGHMEM
 338                 if (mi->bank[i].highmem)
 339                         idx = ZONE_HIGHMEM;
 340 #endif
 341                 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
 342         }
 343
 344         /*
 345          * Adjust the sizes according to any special requirements for
 346          * this machine type.
 347          */
 348         arch_adjust_zones(node, zone_size, zhole_size);
 349
 350         free_area_init_node(node, zone_size, min, zhole_size);
 351 }
 352
 353 #ifndef CONFIG_SPARSEMEM
 354 int pfn_valid(unsigned long pfn)
 355 {
 356         struct meminfo *mi = &meminfo;
 357         unsigned int left = 0, right = mi->nr_banks;
 358
 359         do {
 360                 unsigned int mid = (right + left) / 2;
 361                 struct membank *bank = &mi->bank[mid];
 362
 363                 if (pfn < bank_pfn_start(bank))
 364                         right = mid;
 365                 else if (pfn >= bank_pfn_end(bank))
 366                         left = mid + 1;
 367                 else
 368                         return 1;
 369         } while (left < right);
 370         return 0;
 371 }
 372 EXPORT_SYMBOL(pfn_valid);
 373
 374 static void arm_memory_present(struct meminfo *mi, int node)
 375 {
 376 }
 377 #else
 378 static void arm_memory_present(struct meminfo *mi, int node)
 379 {
 380         int i;
 381         for_each_nodebank(i, mi, node) {
 382                 struct membank *bank = &mi->bank[i];
 383                 memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
 384         }
 385 }
 386 #endif
 387
 388 static int __init meminfo_cmp(const void *_a, const void *_b)
 389 {
 390         const struct membank *a = _a, *b = _b;
 391         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
 392         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
 393 }
 394
 395 void __init bootmem_init(void)
 396 {
 397         struct meminfo *mi = &meminfo;
 398         unsigned long min, max_low, max_high;
 399         int node, initrd_node;
 400
 401         sort(&mi->bank, mi->nr_banks, sizeof(mi->bank[0]), meminfo_cmp, NULL);
 402
 403         /*
 404          * Locate which node contains the ramdisk image, if any.
 405          */
 406         initrd_node = check_initrd(mi);
 407
 408         max_low = max_high = 0;
 409
 410         /*
 411          * Run through each node initialising the bootmem allocator.
 412          */
 413         for_each_node(node) {
 414                 unsigned long node_low, node_high;
 415
 416                 find_node_limits(node, mi, &min, &node_low, &node_high);
 417
 418                 if (node_low > max_low)
 419                         max_low = node_low;
 420                 if (node_high > max_high)
 421                         max_high = node_high;
 422
 423                 /*
 424                  * If there is no memory in this node, ignore it.
 425                  * (We can't have nodes which have no lowmem)
 426                  */
 427                 if (node_low == 0)
 428                         continue;
 429
 430                 bootmem_init_node(node, mi, min, node_low);
 431
 432                 /*
 433                  * Reserve any special node zero regions.
 434                  */
 435                 if (node == 0)
 436                         reserve_node_zero(NODE_DATA(node));
 437
 438                 /*
 439                  * If the initrd is in this node, reserve its memory.
 440                  */
 441                 if (node == initrd_node)
 442                         bootmem_reserve_initrd(node);
 443
 444                 /*
 445                  * Sparsemem tries to allocate bootmem in memory_present(),
 446                  * so must be done after the fixed reservations
 447                  */
 448                 arm_memory_present(mi, node);
 449         }
 450
 451         /*
 452          * sparse_init() needs the bootmem allocator up and running.
 453          */
 454         sparse_init();
 455
 456         /*
 457          * Now free memory in each node - free_area_init_node needs
 458          * the sparse mem_map arrays initialized by sparse_init()
 459          * for memmap_init_zone(), otherwise all PFNs are invalid.
 460          */
 461         for_each_node(node)
 462                 bootmem_free_node(node, mi);
 463
 464         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
 465
 466         /*
 467          * This doesn't seem to be used by the Linux memory manager any
 468          * more, but is used by ll_rw_block.  If we can get rid of it, we
 469          * also get rid of some of the stuff above as well.
 470          *
 471          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 472          * the system, not the maximum PFN.
 473          */
 474         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 475         max_pfn = max_high - PHYS_PFN_OFFSET;
 476 }
 477
 478 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 479 {
 480         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 481
 482         for (; pfn < end; pfn++) {
 483                 struct page *page = pfn_to_page(pfn);
 484                 ClearPageReserved(page);
 485                 init_page_count(page);
 486                 __free_page(page);
 487                 pages++;
 488         }
 489
 490         if (size && s)
 491                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 492
 493         return pages;
 494 }
 495
 496 static inline void
 497 free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
 498 {
 499         struct page *start_pg, *end_pg;
 500         unsigned long pg, pgend;
 501
 502         /*
 503          * Convert start_pfn/end_pfn to a struct page pointer.
 504          */
 505         start_pg = pfn_to_page(start_pfn - 1) + 1;
 506         end_pg = pfn_to_page(end_pfn);
 507
 508         /*
 509          * Convert to physical addresses, and
 510          * round start upwards and end downwards.
 511          */
 512         pg = PAGE_ALIGN(__pa(start_pg));
 513         pgend = __pa(end_pg) & PAGE_MASK;
 514
 515         /*
 516          * If there are free pages between these,
 517          * free the section of the memmap array.
 518          */
 519         if (pg < pgend)
 520                 free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
 521 }
 522
 523 /*
 524  * The mem_map array can get very big.  Free the unused area of the memory map.
 525  */
 526 static void __init free_unused_memmap_node(int node, struct meminfo *mi)
 527 {
 528         unsigned long bank_start, prev_bank_end = 0;
 529         unsigned int i;
 530
 531         /*
 532          * [FIXME] This relies on each bank being in address order.  This
 533          * may not be the case, especially if the user has provided the
 534          * information on the command line.
 535          */
 536         for_each_nodebank(i, mi, node) {
 537                 struct membank *bank = &mi->bank[i];
 538
 539                 bank_start = bank_pfn_start(bank);
 540                 if (bank_start < prev_bank_end) {
 541                         printk(KERN_ERR "MEM: unordered memory banks.  "
 542                                 "Not freeing memmap.\n");
 543                         break;
 544                 }
 545
 546                 /*
 547                  * If we had a previous bank, and there is a space
 548                  * between the current bank and the previous, free it.
 549                  */
 550                 if (prev_bank_end && prev_bank_end != bank_start)
 551                         free_memmap(node, prev_bank_end, bank_start);
 552
 553                 prev_bank_end = bank_pfn_end(bank);
 554         }
 555 }
 556
 557 /*
 558  * mem_init() marks the free areas in the mem_map and tells us how much
 559  * memory is free.  This is done after various parts of the system have
 560  * claimed their memory after the kernel image.
 561  */
 562 void __init mem_init(void)
 563 {
 564         unsigned long reserved_pages, free_pages;
 565         int i, node;
 566
 567 #ifndef CONFIG_DISCONTIGMEM
 568         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 569 #endif
 570
 571         /* this will put all unused low memory onto the freelists */
 572         for_each_online_node(node) {
 573                 pg_data_t *pgdat = NODE_DATA(node);
 574
 575                 free_unused_memmap_node(node, &meminfo);
 576
 577                 if (pgdat->node_spanned_pages != 0)
 578                         totalram_pages += free_all_bootmem_node(pgdat);
 579         }
 580
 581 #ifdef CONFIG_SA1111
 582         /* now that our DMA memory is actually so designated, we can free it */
 583         totalram_pages += free_area(PHYS_PFN_OFFSET,
 584                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 585 #endif
 586
 587 #ifdef CONFIG_HIGHMEM
 588         /* set highmem page free */
 589         for_each_online_node(node) {
 590                 for_each_nodebank (i, &meminfo, node) {
 591                         unsigned long start = bank_pfn_start(&meminfo.bank[i]);
 592                         unsigned long end = bank_pfn_end(&meminfo.bank[i]);
 593                         if (start >= max_low_pfn + PHYS_PFN_OFFSET)
 594                                 totalhigh_pages += free_area(start, end, NULL);
 595                 }
 596         }
 597         totalram_pages += totalhigh_pages;
 598 #endif
 599
 600         reserved_pages = free_pages = 0;
 601
 602         for_each_online_node(node) {
 603                 for_each_nodebank(i, &meminfo, node) {
 604                         struct membank *bank = &meminfo.bank[i];
 605                         unsigned int pfn1, pfn2;
 606                         struct page *page, *end;
 607
 608                         pfn1 = bank_pfn_start(bank);
 609                         pfn2 = bank_pfn_end(bank);
 610
 611                         page = pfn_to_page(pfn1);
 612                         end  = pfn_to_page(pfn2 - 1) + 1;
 613
 614                         do {
 615                                 if (PageReserved(page))
 616                                         reserved_pages++;
 617                                 else if (!page_count(page))
 618                                         free_pages++;
 619                                 page++;
 620                         } while (page < end);
 621                 }
 622         }
 623
 624         /*
 625          * Since our memory may not be contiguous, calculate the
 626          * real number of pages we have in this system
 627          */
 628         printk(KERN_INFO "Memory:");
 629         num_physpages = 0;
 630         for (i = 0; i < meminfo.nr_banks; i++) {
 631                 num_physpages += bank_pfn_size(&meminfo.bank[i]);
 632                 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
 633         }
 634         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 635
 636         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 637                 nr_free_pages() << (PAGE_SHIFT-10),
 638                 free_pages << (PAGE_SHIFT-10),
 639                 reserved_pages << (PAGE_SHIFT-10),
 640                 totalhigh_pages << (PAGE_SHIFT-10));
 641
 642 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 643 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 644 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 645
 646         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 647                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 648                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 649 #ifdef CONFIG_MMU
 650                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 651 #endif
 652                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 653                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 654 #ifdef CONFIG_HIGHMEM
 655                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 656 #endif
 657                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 658                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 659                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 660                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 661
 662                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 663                                 (PAGE_SIZE)),
 664                         MLK(FIXADDR_START, FIXADDR_TOP),
 665 #ifdef CONFIG_MMU
 666                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 667 #endif
 668                         MLM(VMALLOC_START, VMALLOC_END),
 669                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 670 #ifdef CONFIG_HIGHMEM
 671                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 672                                 (PAGE_SIZE)),
 673 #endif
 674                         MLM(MODULES_VADDR, MODULES_END),
 675
 676                         MLK_ROUNDUP(__init_begin, __init_end),
 677                         MLK_ROUNDUP(_text, _etext),
 678                         MLK_ROUNDUP(_data, _edata));
 679
 680 #undef MLK
 681 #undef MLM
 682 #undef MLK_ROUNDUP
 683
 684         /*
 685          * Check boundaries twice: Some fundamental inconsistencies can
 686          * be detected at build time already.
 687          */
 688 #ifdef CONFIG_MMU
 689         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 690         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 691
 692         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 693         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 694 #endif
 695
 696 #ifdef CONFIG_HIGHMEM
 697         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 698         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 699 #endif
 700
 701         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 702                 extern int sysctl_overcommit_memory;
 703                 /*
 704                  * On a machine this small we won't get
 705                  * anywhere without overcommit, so turn
 706                  * it on by default.
 707                  */
 708                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 709         }
 710 }
 711
 712 void free_initmem(void)
 713 {
 714 #ifdef CONFIG_HAVE_TCM
 715         extern char *__tcm_start, *__tcm_end;
 716
 717         totalram_pages += free_area(__phys_to_pfn(__pa(__tcm_start)),
 718                                     __phys_to_pfn(__pa(__tcm_end)),
 719                                     "TCM link");
 720 #endif
 721
 722         if (!machine_is_integrator() && !machine_is_cintegrator())
 723                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 724                                             __phys_to_pfn(__pa(__init_end)),
 725                                             "init");
 726 }
 727
 728 #ifdef CONFIG_BLK_DEV_INITRD
 729
 730 static int keep_initrd;
 731
 732 void free_initrd_mem(unsigned long start, unsigned long end)
 733 {
 734         if (!keep_initrd)
 735                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 736                                             __phys_to_pfn(__pa(end)),
 737                                             "initrd");
 738 }
 739
 740 static int __init keepinitrd_setup(char *__unused)
 741 {
 742         keep_initrd = 1;
 743         return 1;
 744 }
 745
 746 __setup("keepinitrd", keepinitrd_setup);
 747 #endif