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