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                 pg_data_t *n = NODE_DATA(node);
  90                 struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn;
  91
  92                 for_each_nodebank (i,mi,node) {
  93                         struct membank *bank = &mi->bank[i];
  94                         unsigned int pfn1, pfn2;
  95                         struct page *page, *end;
  96
  97                         pfn1 = bank_pfn_start(bank);
  98                         pfn2 = bank_pfn_end(bank);
  99
 100                         page = map + pfn1;
 101                         end  = map + pfn2;
 102
 103                         do {
 104                                 total++;
 105                                 if (PageReserved(page))
 106                                         reserved++;
 107                                 else if (PageSwapCache(page))
 108                                         cached++;
 109                                 else if (PageSlab(page))
 110                                         slab++;
 111                                 else if (!page_count(page))
 112                                         free++;
 113                                 else
 114                                         shared += page_count(page) - 1;
 115                                 page++;
 116                         } while (page < end);
 117                 }
 118         }
 119
 120         printk("%d pages of RAM\n", total);
 121         printk("%d free pages\n", free);
 122         printk("%d reserved pages\n", reserved);
 123         printk("%d slab pages\n", slab);
 124         printk("%d pages shared\n", shared);
 125         printk("%d pages swap cached\n", cached);
 126 }
 127
 128 static void __init find_node_limits(int node, struct meminfo *mi,
 129         unsigned long *min, unsigned long *max_low, unsigned long *max_high)
 130 {
 131         int i;
 132
 133         *min = -1UL;
 134         *max_low = *max_high = 0;
 135
 136         for_each_nodebank(i, mi, node) {
 137                 struct membank *bank = &mi->bank[i];
 138                 unsigned long start, end;
 139
 140                 start = bank_pfn_start(bank);
 141                 end = bank_pfn_end(bank);
 142
 143                 if (*min > start)
 144                         *min = start;
 145                 if (*max_high < end)
 146                         *max_high = end;
 147                 if (bank->highmem)
 148                         continue;
 149                 if (*max_low < end)
 150                         *max_low = end;
 151         }
 152 }
 153
 154 /*
 155  * FIXME: We really want to avoid allocating the bootmap bitmap
 156  * over the top of the initrd.  Hopefully, this is located towards
 157  * the start of a bank, so if we allocate the bootmap bitmap at
 158  * the end, we won't clash.
 159  */
 160 static unsigned int __init
 161 find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
 162 {
 163         unsigned int start_pfn, i, bootmap_pfn;
 164
 165         start_pfn   = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT;
 166         bootmap_pfn = 0;
 167
 168         for_each_nodebank(i, mi, node) {
 169                 struct membank *bank = &mi->bank[i];
 170                 unsigned int start, end;
 171
 172                 start = bank_pfn_start(bank);
 173                 end   = bank_pfn_end(bank);
 174
 175                 if (end < start_pfn)
 176                         continue;
 177
 178                 if (start < start_pfn)
 179                         start = start_pfn;
 180
 181                 if (end <= start)
 182                         continue;
 183
 184                 if (end - start >= bootmap_pages) {
 185                         bootmap_pfn = start;
 186                         break;
 187                 }
 188         }
 189
 190         if (bootmap_pfn == 0)
 191                 BUG();
 192
 193         return bootmap_pfn;
 194 }
 195
 196 static int __init check_initrd(struct meminfo *mi)
 197 {
 198         int initrd_node = -2;
 199 #ifdef CONFIG_BLK_DEV_INITRD
 200         unsigned long end = phys_initrd_start + phys_initrd_size;
 201
 202         /*
 203          * Make sure that the initrd is within a valid area of
 204          * memory.
 205          */
 206         if (phys_initrd_size) {
 207                 unsigned int i;
 208
 209                 initrd_node = -1;
 210
 211                 for (i = 0; i < mi->nr_banks; i++) {
 212                         struct membank *bank = &mi->bank[i];
 213                         if (bank_phys_start(bank) <= phys_initrd_start &&
 214                             end <= bank_phys_end(bank))
 215                                 initrd_node = bank->node;
 216                 }
 217         }
 218
 219         if (initrd_node == -1) {
 220                 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
 221                        "physical memory - disabling initrd\n",
 222                        phys_initrd_start, phys_initrd_size);
 223                 phys_initrd_start = phys_initrd_size = 0;
 224         }
 225 #endif
 226
 227         return initrd_node;
 228 }
 229
 230 static inline void map_memory_bank(struct membank *bank)
 231 {
 232 #ifdef CONFIG_MMU
 233         struct map_desc map;
 234
 235         map.pfn = bank_pfn_start(bank);
 236         map.virtual = __phys_to_virt(bank_phys_start(bank));
 237         map.length = bank_phys_size(bank);
 238         map.type = MT_MEMORY;
 239
 240         create_mapping(&map);
 241 #endif
 242 }
 243
 244 static void __init bootmem_init_node(int node, struct meminfo *mi,
 245         unsigned long start_pfn, unsigned long end_pfn)
 246 {
 247         unsigned long boot_pfn;
 248         unsigned int boot_pages;
 249         pg_data_t *pgdat;
 250         int i;
 251
 252         /*
 253          * Map the memory banks for this node.
 254          */
 255         for_each_nodebank(i, mi, node) {
 256                 struct membank *bank = &mi->bank[i];
 257
 258                 if (!bank->highmem)
 259                         map_memory_bank(bank);
 260         }
 261
 262         /*
 263          * Allocate the bootmem bitmap page.
 264          */
 265         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 266         boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
 267
 268         /*
 269          * Initialise the bootmem allocator for this node, handing the
 270          * memory banks over to bootmem.
 271          */
 272         node_set_online(node);
 273         pgdat = NODE_DATA(node);
 274         init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
 275
 276         for_each_nodebank(i, mi, node) {
 277                 struct membank *bank = &mi->bank[i];
 278                 if (!bank->highmem)
 279                         free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
 280         }
 281
 282         /*
 283          * Reserve the bootmem bitmap for this node.
 284          */
 285         reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
 286                              boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
 287 }
 288
 289 static void __init bootmem_reserve_initrd(int node)
 290 {
 291 #ifdef CONFIG_BLK_DEV_INITRD
 292         pg_data_t *pgdat = NODE_DATA(node);
 293         int res;
 294
 295         res = reserve_bootmem_node(pgdat, phys_initrd_start,
 296                              phys_initrd_size, BOOTMEM_EXCLUSIVE);
 297
 298         if (res == 0) {
 299                 initrd_start = __phys_to_virt(phys_initrd_start);
 300                 initrd_end = initrd_start + phys_initrd_size;
 301         } else {
 302                 printk(KERN_ERR
 303                         "INITRD: 0x%08lx+0x%08lx overlaps in-use "
 304                         "memory region - disabling initrd\n",
 305                         phys_initrd_start, phys_initrd_size);
 306         }
 307 #endif
 308 }
 309
 310 static void __init bootmem_free_node(int node, struct meminfo *mi)
 311 {
 312         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 313         unsigned long min, max_low, max_high;
 314         int i;
 315
 316         find_node_limits(node, mi, &min, &max_low, &max_high);
 317
 318         /*
 319          * initialise the zones within this node.
 320          */
 321         memset(zone_size, 0, sizeof(zone_size));
 322
 323         /*
 324          * The size of this node has already been determined.  If we need
 325          * to do anything fancy with the allocation of this memory to the
 326          * zones, now is the time to do it.
 327          */
 328         zone_size[0] = max_low - min;
 329 #ifdef CONFIG_HIGHMEM
 330         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 331 #endif
 332
 333         /*
 334          * For each bank in this node, calculate the size of the holes.
 335          *  holes = node_size - sum(bank_sizes_in_node)
 336          */
 337         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 338         for_each_nodebank(i, mi, node) {
 339                 int idx = 0;
 340 #ifdef CONFIG_HIGHMEM
 341                 if (mi->bank[i].highmem)
 342                         idx = ZONE_HIGHMEM;
 343 #endif
 344                 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
 345         }
 346
 347         /*
 348          * Adjust the sizes according to any special requirements for
 349          * this machine type.
 350          */
 351         arch_adjust_zones(node, zone_size, zhole_size);
 352
 353         free_area_init_node(node, zone_size, min, zhole_size);
 354 }
 355
 356 #ifndef CONFIG_SPARSEMEM
 357 int pfn_valid(unsigned long pfn)
 358 {
 359         struct meminfo *mi = &meminfo;
 360         unsigned int left = 0, right = mi->nr_banks;
 361
 362         do {
 363                 unsigned int mid = (right + left) / 2;
 364                 struct membank *bank = &mi->bank[mid];
 365
 366                 if (pfn < bank_pfn_start(bank))
 367                         right = mid;
 368                 else if (pfn >= bank_pfn_end(bank))
 369                         left = mid + 1;
 370                 else
 371                         return 1;
 372         } while (left < right);
 373         return 0;
 374 }
 375 EXPORT_SYMBOL(pfn_valid);
 376
 377 static void arm_memory_present(struct meminfo *mi, int node)
 378 {
 379 }
 380 #else
 381 static void arm_memory_present(struct meminfo *mi, int node)
 382 {
 383         int i;
 384         for_each_nodebank(i, mi, node) {
 385                 struct membank *bank = &mi->bank[i];
 386                 memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
 387         }
 388 }
 389 #endif
 390
 391 static int __init meminfo_cmp(const void *_a, const void *_b)
 392 {
 393         const struct membank *a = _a, *b = _b;
 394         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
 395         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
 396 }
 397
 398 void __init bootmem_init(void)
 399 {
 400         struct meminfo *mi = &meminfo;
 401         unsigned long min, max_low, max_high;
 402         int node, initrd_node;
 403
 404         sort(&mi->bank, mi->nr_banks, sizeof(mi->bank[0]), meminfo_cmp, NULL);
 405
 406         /*
 407          * Locate which node contains the ramdisk image, if any.
 408          */
 409         initrd_node = check_initrd(mi);
 410
 411         max_low = max_high = 0;
 412
 413         /*
 414          * Run through each node initialising the bootmem allocator.
 415          */
 416         for_each_node(node) {
 417                 unsigned long node_low, node_high;
 418
 419                 find_node_limits(node, mi, &min, &node_low, &node_high);
 420
 421                 if (node_low > max_low)
 422                         max_low = node_low;
 423                 if (node_high > max_high)
 424                         max_high = node_high;
 425
 426                 /*
 427                  * If there is no memory in this node, ignore it.
 428                  * (We can't have nodes which have no lowmem)
 429                  */
 430                 if (node_low == 0)
 431                         continue;
 432
 433                 bootmem_init_node(node, mi, min, node_low);
 434
 435                 /*
 436                  * Reserve any special node zero regions.
 437                  */
 438                 if (node == 0)
 439                         reserve_node_zero(NODE_DATA(node));
 440
 441                 /*
 442                  * If the initrd is in this node, reserve its memory.
 443                  */
 444                 if (node == initrd_node)
 445                         bootmem_reserve_initrd(node);
 446
 447                 /*
 448                  * Sparsemem tries to allocate bootmem in memory_present(),
 449                  * so must be done after the fixed reservations
 450                  */
 451                 arm_memory_present(mi, node);
 452         }
 453
 454         /*
 455          * sparse_init() needs the bootmem allocator up and running.
 456          */
 457         sparse_init();
 458
 459         /*
 460          * Now free memory in each node - free_area_init_node needs
 461          * the sparse mem_map arrays initialized by sparse_init()
 462          * for memmap_init_zone(), otherwise all PFNs are invalid.
 463          */
 464         for_each_node(node)
 465                 bootmem_free_node(node, mi);
 466
 467         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
 468
 469         /*
 470          * This doesn't seem to be used by the Linux memory manager any
 471          * more, but is used by ll_rw_block.  If we can get rid of it, we
 472          * also get rid of some of the stuff above as well.
 473          *
 474          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 475          * the system, not the maximum PFN.
 476          */
 477         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 478         max_pfn = max_high - PHYS_PFN_OFFSET;
 479 }
 480
 481 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 482 {
 483         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 484
 485         for (; pfn < end; pfn++) {
 486                 struct page *page = pfn_to_page(pfn);
 487                 ClearPageReserved(page);
 488                 init_page_count(page);
 489                 __free_page(page);
 490                 pages++;
 491         }
 492
 493         if (size && s)
 494                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 495
 496         return pages;
 497 }
 498
 499 static inline void
 500 free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
 501 {
 502         struct page *start_pg, *end_pg;
 503         unsigned long pg, pgend;
 504
 505         /*
 506          * Convert start_pfn/end_pfn to a struct page pointer.
 507          */
 508         start_pg = pfn_to_page(start_pfn - 1) + 1;
 509         end_pg = pfn_to_page(end_pfn);
 510
 511         /*
 512          * Convert to physical addresses, and
 513          * round start upwards and end downwards.
 514          */
 515         pg = PAGE_ALIGN(__pa(start_pg));
 516         pgend = __pa(end_pg) & PAGE_MASK;
 517
 518         /*
 519          * If there are free pages between these,
 520          * free the section of the memmap array.
 521          */
 522         if (pg < pgend)
 523                 free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
 524 }
 525
 526 /*
 527  * The mem_map array can get very big.  Free the unused area of the memory map.
 528  */
 529 static void __init free_unused_memmap_node(int node, struct meminfo *mi)
 530 {
 531         unsigned long bank_start, prev_bank_end = 0;
 532         unsigned int i;
 533
 534         /*
 535          * [FIXME] This relies on each bank being in address order.  This
 536          * may not be the case, especially if the user has provided the
 537          * information on the command line.
 538          */
 539         for_each_nodebank(i, mi, node) {
 540                 struct membank *bank = &mi->bank[i];
 541
 542                 bank_start = bank_pfn_start(bank);
 543                 if (bank_start < prev_bank_end) {
 544                         printk(KERN_ERR "MEM: unordered memory banks.  "
 545                                 "Not freeing memmap.\n");
 546                         break;
 547                 }
 548
 549                 /*
 550                  * If we had a previous bank, and there is a space
 551                  * between the current bank and the previous, free it.
 552                  */
 553                 if (prev_bank_end && prev_bank_end != bank_start)
 554                         free_memmap(node, prev_bank_end, bank_start);
 555
 556                 prev_bank_end = bank_pfn_end(bank);
 557         }
 558 }
 559
 560 /*
 561  * mem_init() marks the free areas in the mem_map and tells us how much
 562  * memory is free.  This is done after various parts of the system have
 563  * claimed their memory after the kernel image.
 564  */
 565 void __init mem_init(void)
 566 {
 567         unsigned long reserved_pages, free_pages;
 568         int i, node;
 569
 570 #ifndef CONFIG_DISCONTIGMEM
 571         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 572 #endif
 573
 574         /* this will put all unused low memory onto the freelists */
 575         for_each_online_node(node) {
 576                 pg_data_t *pgdat = NODE_DATA(node);
 577
 578                 free_unused_memmap_node(node, &meminfo);
 579
 580                 if (pgdat->node_spanned_pages != 0)
 581                         totalram_pages += free_all_bootmem_node(pgdat);
 582         }
 583
 584 #ifdef CONFIG_SA1111
 585         /* now that our DMA memory is actually so designated, we can free it */
 586         totalram_pages += free_area(PHYS_PFN_OFFSET,
 587                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 588 #endif
 589
 590 #ifdef CONFIG_HIGHMEM
 591         /* set highmem page free */
 592         for_each_online_node(node) {
 593                 for_each_nodebank (i, &meminfo, node) {
 594                         unsigned long start = bank_pfn_start(&meminfo.bank[i]);
 595                         unsigned long end = bank_pfn_end(&meminfo.bank[i]);
 596                         if (start >= max_low_pfn + PHYS_PFN_OFFSET)
 597                                 totalhigh_pages += free_area(start, end, NULL);
 598                 }
 599         }
 600         totalram_pages += totalhigh_pages;
 601 #endif
 602
 603         reserved_pages = free_pages = 0;
 604
 605         for_each_online_node(node) {
 606                 pg_data_t *n = NODE_DATA(node);
 607                 struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn;
 608
 609                 for_each_nodebank(i, &meminfo, node) {
 610                         struct membank *bank = &meminfo.bank[i];
 611                         unsigned int pfn1, pfn2;
 612                         struct page *page, *end;
 613
 614                         pfn1 = bank_pfn_start(bank);
 615                         pfn2 = bank_pfn_end(bank);
 616
 617                         page = map + pfn1;
 618                         end  = map + pfn2;
 619
 620                         do {
 621                                 if (PageReserved(page))
 622                                         reserved_pages++;
 623                                 else if (!page_count(page))
 624                                         free_pages++;
 625                                 page++;
 626                         } while (page < end);
 627                 }
 628         }
 629
 630         /*
 631          * Since our memory may not be contiguous, calculate the
 632          * real number of pages we have in this system
 633          */
 634         printk(KERN_INFO "Memory:");
 635         num_physpages = 0;
 636         for (i = 0; i < meminfo.nr_banks; i++) {
 637                 num_physpages += bank_pfn_size(&meminfo.bank[i]);
 638                 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
 639         }
 640         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 641
 642         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 643                 nr_free_pages() << (PAGE_SHIFT-10),
 644                 free_pages << (PAGE_SHIFT-10),
 645                 reserved_pages << (PAGE_SHIFT-10),
 646                 totalhigh_pages << (PAGE_SHIFT-10));
 647
 648 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 649 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 650 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 651
 652         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 653                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 654                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 655 #ifdef CONFIG_MMU
 656                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 657 #endif
 658                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 659                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 660 #ifdef CONFIG_HIGHMEM
 661                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 662 #endif
 663                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 664                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 665                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 666                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 667
 668                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 669                                 (PAGE_SIZE)),
 670                         MLK(FIXADDR_START, FIXADDR_TOP),
 671 #ifdef CONFIG_MMU
 672                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 673 #endif
 674                         MLM(VMALLOC_START, VMALLOC_END),
 675                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 676 #ifdef CONFIG_HIGHMEM
 677                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 678                                 (PAGE_SIZE)),
 679 #endif
 680                         MLM(MODULES_VADDR, MODULES_END),
 681
 682                         MLK_ROUNDUP(__init_begin, __init_end),
 683                         MLK_ROUNDUP(_text, _etext),
 684                         MLK_ROUNDUP(_data, _edata));
 685
 686 #undef MLK
 687 #undef MLM
 688 #undef MLK_ROUNDUP
 689
 690         /*
 691          * Check boundaries twice: Some fundamental inconsistencies can
 692          * be detected at build time already.
 693          */
 694 #ifdef CONFIG_MMU
 695         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 696         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 697
 698         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 699         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 700 #endif
 701
 702 #ifdef CONFIG_HIGHMEM
 703         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 704         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 705 #endif
 706
 707         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 708                 extern int sysctl_overcommit_memory;
 709                 /*
 710                  * On a machine this small we won't get
 711                  * anywhere without overcommit, so turn
 712                  * it on by default.
 713                  */
 714                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 715         }
 716 }
 717
 718 void free_initmem(void)
 719 {
 720 #ifdef CONFIG_HAVE_TCM
 721         extern char *__tcm_start, *__tcm_end;
 722
 723         totalram_pages += free_area(__phys_to_pfn(__pa(__tcm_start)),
 724                                     __phys_to_pfn(__pa(__tcm_end)),
 725                                     "TCM link");
 726 #endif
 727
 728         if (!machine_is_integrator() && !machine_is_cintegrator())
 729                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 730                                             __phys_to_pfn(__pa(__init_end)),
 731                                             "init");
 732 }
 733
 734 #ifdef CONFIG_BLK_DEV_INITRD
 735
 736 static int keep_initrd;
 737
 738 void free_initrd_mem(unsigned long start, unsigned long end)
 739 {
 740         if (!keep_initrd)
 741                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 742                                             __phys_to_pfn(__pa(end)),
 743                                             "initrd");
 744 }
 745
 746 static int __init keepinitrd_setup(char *__unused)
 747 {
 748         keep_initrd = 1;
 749         return 1;
 750 }
 751
 752 __setup("keepinitrd", keepinitrd_setup);
 753 #endif