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/of_fdt.h>
  19 #include <linux/highmem.h>
  20 #include <linux/gfp.h>
  21 #include <linux/memblock.h>
  22 #include <linux/sort.h>
  23
  24 #include <asm/mach-types.h>
  25 #include <asm/prom.h>
  26 #include <asm/sections.h>
  27 #include <asm/setup.h>
  28 #include <asm/sizes.h>
  29 #include <asm/tlb.h>
  30 #include <asm/fixmap.h>
  31
  32 #include <asm/mach/arch.h>
  33 #include <asm/mach/map.h>
  34
  35 #include "mm.h"
  36
  37 static unsigned long phys_initrd_start __initdata = 0;
  38 static unsigned long phys_initrd_size __initdata = 0;
  39
  40 static int __init early_initrd(char *p)
  41 {
  42         unsigned long start, size;
  43         char *endp;
  44
  45         start = memparse(p, &endp);
  46         if (*endp == ',') {
  47                 size = memparse(endp + 1, NULL);
  48
  49                 phys_initrd_start = start;
  50                 phys_initrd_size = size;
  51         }
  52         return 0;
  53 }
  54 early_param("initrd", early_initrd);
  55
  56 static int __init parse_tag_initrd(const struct tag *tag)
  57 {
  58         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
  59                 "please update your bootloader.\n");
  60         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  61         phys_initrd_size = tag->u.initrd.size;
  62         return 0;
  63 }
  64
  65 __tagtable(ATAG_INITRD, parse_tag_initrd);
  66
  67 static int __init parse_tag_initrd2(const struct tag *tag)
  68 {
  69         phys_initrd_start = tag->u.initrd.start;
  70         phys_initrd_size = tag->u.initrd.size;
  71         return 0;
  72 }
  73
  74 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  75
  76 #ifdef CONFIG_OF_FLATTREE
  77 void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
  78 {
  79         phys_initrd_start = start;
  80         phys_initrd_size = end - start;
  81 }
  82 #endif /* CONFIG_OF_FLATTREE */
  83
  84 /*
  85  * This keeps memory configuration data used by a couple memory
  86  * initialization functions, as well as show_mem() for the skipping
  87  * of holes in the memory map.  It is populated by arm_add_memory().
  88  */
  89 struct meminfo meminfo;
  90
  91 void show_mem(unsigned int filter)
  92 {
  93         int free = 0, total = 0, reserved = 0;
  94         int shared = 0, cached = 0, slab = 0, i;
  95         struct meminfo * mi = &meminfo;
  96
  97         printk("Mem-info:\n");
  98         show_free_areas(filter);
  99
 100         for_each_bank (i, mi) {
 101                 struct membank *bank = &mi->bank[i];
 102                 unsigned int pfn1, pfn2;
 103                 struct page *page, *end;
 104
 105                 pfn1 = bank_pfn_start(bank);
 106                 pfn2 = bank_pfn_end(bank);
 107
 108                 page = pfn_to_page(pfn1);
 109                 end  = pfn_to_page(pfn2 - 1) + 1;
 110
 111                 do {
 112                         total++;
 113                         if (PageReserved(page))
 114                                 reserved++;
 115                         else if (PageSwapCache(page))
 116                                 cached++;
 117                         else if (PageSlab(page))
 118                                 slab++;
 119                         else if (!page_count(page))
 120                                 free++;
 121                         else
 122                                 shared += page_count(page) - 1;
 123                         page++;
 124                 } while (page < end);
 125         }
 126
 127         printk("%d pages of RAM\n", total);
 128         printk("%d free pages\n", free);
 129         printk("%d reserved pages\n", reserved);
 130         printk("%d slab pages\n", slab);
 131         printk("%d pages shared\n", shared);
 132         printk("%d pages swap cached\n", cached);
 133 }
 134
 135 static void __init find_limits(unsigned long *min, unsigned long *max_low,
 136         unsigned long *max_high)
 137 {
 138         struct meminfo *mi = &meminfo;
 139         int i;
 140
 141         *min = -1UL;
 142         *max_low = *max_high = 0;
 143
 144         for_each_bank (i, mi) {
 145                 struct membank *bank = &mi->bank[i];
 146                 unsigned long start, end;
 147
 148                 start = bank_pfn_start(bank);
 149                 end = bank_pfn_end(bank);
 150
 151                 if (*min > start)
 152                         *min = start;
 153                 if (*max_high < end)
 154                         *max_high = end;
 155                 if (bank->highmem)
 156                         continue;
 157                 if (*max_low < end)
 158                         *max_low = end;
 159         }
 160 }
 161
 162 static void __init arm_bootmem_init(unsigned long start_pfn,
 163         unsigned long end_pfn)
 164 {
 165         struct memblock_region *reg;
 166         unsigned int boot_pages;
 167         phys_addr_t bitmap;
 168         pg_data_t *pgdat;
 169
 170         /*
 171          * Allocate the bootmem bitmap page.  This must be in a region
 172          * of memory which has already been mapped.
 173          */
 174         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 175         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
 176                                 __pfn_to_phys(end_pfn));
 177
 178         /*
 179          * Initialise the bootmem allocator, handing the
 180          * memory banks over to bootmem.
 181          */
 182         node_set_online(0);
 183         pgdat = NODE_DATA(0);
 184         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 185
 186         /* Free the lowmem regions from memblock into bootmem. */
 187         for_each_memblock(memory, reg) {
 188                 unsigned long start = memblock_region_memory_base_pfn(reg);
 189                 unsigned long end = memblock_region_memory_end_pfn(reg);
 190
 191                 if (end >= end_pfn)
 192                         end = end_pfn;
 193                 if (start >= end)
 194                         break;
 195
 196                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
 197         }
 198
 199         /* Reserve the lowmem memblock reserved regions in bootmem. */
 200         for_each_memblock(reserved, reg) {
 201                 unsigned long start = memblock_region_reserved_base_pfn(reg);
 202                 unsigned long end = memblock_region_reserved_end_pfn(reg);
 203
 204                 if (end >= end_pfn)
 205                         end = end_pfn;
 206                 if (start >= end)
 207                         break;
 208
 209                 reserve_bootmem(__pfn_to_phys(start),
 210                                 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
 211         }
 212 }
 213
 214 #ifdef CONFIG_ZONE_DMA
 215 /*
 216  * The DMA mask corresponding to the maximum bus address allocatable
 217  * using GFP_DMA.  The default here places no restriction on DMA
 218  * allocations.  This must be the smallest DMA mask in the system,
 219  * so a successful GFP_DMA allocation will always satisfy this.
 220  */
 221 u32 arm_dma_limit;
 222
 223 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
 224         unsigned long dma_size)
 225 {
 226         if (size[0] <= dma_size)
 227                 return;
 228
 229         size[ZONE_NORMAL] = size[0] - dma_size;
 230         size[ZONE_DMA] = dma_size;
 231         hole[ZONE_NORMAL] = hole[0];
 232         hole[ZONE_DMA] = 0;
 233 }
 234 #endif
 235
 236 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
 237         unsigned long max_high)
 238 {
 239         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 240         struct memblock_region *reg;
 241
 242         /*
 243          * initialise the zones.
 244          */
 245         memset(zone_size, 0, sizeof(zone_size));
 246
 247         /*
 248          * The memory size has already been determined.  If we need
 249          * to do anything fancy with the allocation of this memory
 250          * to the zones, now is the time to do it.
 251          */
 252         zone_size[0] = max_low - min;
 253 #ifdef CONFIG_HIGHMEM
 254         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 255 #endif
 256
 257         /*
 258          * Calculate the size of the holes.
 259          *  holes = node_size - sum(bank_sizes)
 260          */
 261         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 262         for_each_memblock(memory, reg) {
 263                 unsigned long start = memblock_region_memory_base_pfn(reg);
 264                 unsigned long end = memblock_region_memory_end_pfn(reg);
 265
 266                 if (start < max_low) {
 267                         unsigned long low_end = min(end, max_low);
 268                         zhole_size[0] -= low_end - start;
 269                 }
 270 #ifdef CONFIG_HIGHMEM
 271                 if (end > max_low) {
 272                         unsigned long high_start = max(start, max_low);
 273                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
 274                 }
 275 #endif
 276         }
 277
 278 #ifdef ARM_DMA_ZONE_SIZE
 279 #ifndef CONFIG_ZONE_DMA
 280 #error ARM_DMA_ZONE_SIZE set but no DMA zone to limit allocations
 281 #endif
 282
 283         /*
 284          * Adjust the sizes according to any special requirements for
 285          * this machine type.
 286          */
 287         arm_adjust_dma_zone(zone_size, zhole_size,
 288                 ARM_DMA_ZONE_SIZE >> PAGE_SHIFT);
 289
 290         arm_dma_limit = PHYS_OFFSET + ARM_DMA_ZONE_SIZE - 1;
 291 #endif
 292
 293         free_area_init_node(0, zone_size, min, zhole_size);
 294 }
 295
 296 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 297 int pfn_valid(unsigned long pfn)
 298 {
 299         return memblock_is_memory(pfn << PAGE_SHIFT);
 300 }
 301 EXPORT_SYMBOL(pfn_valid);
 302 #endif
 303
 304 #ifndef CONFIG_SPARSEMEM
 305 static void arm_memory_present(void)
 306 {
 307 }
 308 #else
 309 static void arm_memory_present(void)
 310 {
 311         struct memblock_region *reg;
 312
 313         for_each_memblock(memory, reg)
 314                 memory_present(0, memblock_region_memory_base_pfn(reg),
 315                                memblock_region_memory_end_pfn(reg));
 316 }
 317 #endif
 318
 319 static int __init meminfo_cmp(const void *_a, const void *_b)
 320 {
 321         const struct membank *a = _a, *b = _b;
 322         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
 323         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
 324 }
 325
 326 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 327 {
 328         int i;
 329
 330         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
 331
 332         memblock_init();
 333         for (i = 0; i < mi->nr_banks; i++)
 334                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 335
 336         /* Register the kernel text, kernel data and initrd with memblock. */
 337 #ifdef CONFIG_XIP_KERNEL
 338         memblock_reserve(__pa(_sdata), _end - _sdata);
 339 #else
 340         memblock_reserve(__pa(_stext), _end - _stext);
 341 #endif
 342 #ifdef CONFIG_BLK_DEV_INITRD
 343         if (phys_initrd_size &&
 344             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
 345                 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
 346                        phys_initrd_start, phys_initrd_size);
 347                 phys_initrd_start = phys_initrd_size = 0;
 348         }
 349         if (phys_initrd_size &&
 350             memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
 351                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
 352                        phys_initrd_start, phys_initrd_size);
 353                 phys_initrd_start = phys_initrd_size = 0;
 354         }
 355         if (phys_initrd_size) {
 356                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 357
 358                 /* Now convert initrd to virtual addresses */
 359                 initrd_start = __phys_to_virt(phys_initrd_start);
 360                 initrd_end = initrd_start + phys_initrd_size;
 361         }
 362 #endif
 363
 364         arm_mm_memblock_reserve();
 365         arm_dt_memblock_reserve();
 366
 367         /* reserve any platform specific memblock areas */
 368         if (mdesc->reserve)
 369                 mdesc->reserve();
 370
 371         memblock_analyze();
 372         memblock_dump_all();
 373 }
 374
 375 void __init bootmem_init(void)
 376 {
 377         unsigned long min, max_low, max_high;
 378
 379         max_low = max_high = 0;
 380
 381         find_limits(&min, &max_low, &max_high);
 382
 383         arm_bootmem_init(min, max_low);
 384
 385         /*
 386          * Sparsemem tries to allocate bootmem in memory_present(),
 387          * so must be done after the fixed reservations
 388          */
 389         arm_memory_present();
 390
 391         /*
 392          * sparse_init() needs the bootmem allocator up and running.
 393          */
 394         sparse_init();
 395
 396         /*
 397          * Now free the memory - free_area_init_node needs
 398          * the sparse mem_map arrays initialized by sparse_init()
 399          * for memmap_init_zone(), otherwise all PFNs are invalid.
 400          */
 401         arm_bootmem_free(min, max_low, max_high);
 402
 403         high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1;
 404
 405         /*
 406          * This doesn't seem to be used by the Linux memory manager any
 407          * more, but is used by ll_rw_block.  If we can get rid of it, we
 408          * also get rid of some of the stuff above as well.
 409          *
 410          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 411          * the system, not the maximum PFN.
 412          */
 413         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 414         max_pfn = max_high - PHYS_PFN_OFFSET;
 415 }
 416
 417 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 418 {
 419         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 420
 421         for (; pfn < end; pfn++) {
 422                 struct page *page = pfn_to_page(pfn);
 423                 ClearPageReserved(page);
 424                 init_page_count(page);
 425                 __free_page(page);
 426                 pages++;
 427         }
 428
 429         if (size && s)
 430                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 431
 432         return pages;
 433 }
 434
 435 /*
 436  * Poison init memory with an undefined instruction (ARM) or a branch to an
 437  * undefined instruction (Thumb).
 438  */
 439 static inline void poison_init_mem(void *s, size_t count)
 440 {
 441         u32 *p = (u32 *)s;
 442         while ((count = count - 4))
 443                 *p++ = 0xe7fddef0;
 444 }
 445
 446 static inline void
 447 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 448 {
 449         struct page *start_pg, *end_pg;
 450         unsigned long pg, pgend;
 451
 452         /*
 453          * Convert start_pfn/end_pfn to a struct page pointer.
 454          */
 455         start_pg = pfn_to_page(start_pfn - 1) + 1;
 456         end_pg = pfn_to_page(end_pfn - 1) + 1;
 457
 458         /*
 459          * Convert to physical addresses, and
 460          * round start upwards and end downwards.
 461          */
 462         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
 463         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
 464
 465         /*
 466          * If there are free pages between these,
 467          * free the section of the memmap array.
 468          */
 469         if (pg < pgend)
 470                 free_bootmem(pg, pgend - pg);
 471 }
 472
 473 /*
 474  * The mem_map array can get very big.  Free the unused area of the memory map.
 475  */
 476 static void __init free_unused_memmap(struct meminfo *mi)
 477 {
 478         unsigned long bank_start, prev_bank_end = 0;
 479         unsigned int i;
 480
 481         /*
 482          * This relies on each bank being in address order.
 483          * The banks are sorted previously in bootmem_init().
 484          */
 485         for_each_bank(i, mi) {
 486                 struct membank *bank = &mi->bank[i];
 487
 488                 bank_start = bank_pfn_start(bank);
 489
 490 #ifdef CONFIG_SPARSEMEM
 491                 /*
 492                  * Take care not to free memmap entries that don't exist
 493                  * due to SPARSEMEM sections which aren't present.
 494                  */
 495                 bank_start = min(bank_start,
 496                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
 497 #endif
 498                 /*
 499                  * If we had a previous bank, and there is a space
 500                  * between the current bank and the previous, free it.
 501                  */
 502                 if (prev_bank_end && prev_bank_end < bank_start)
 503                         free_memmap(prev_bank_end, bank_start);
 504
 505                 /*
 506                  * Align up here since the VM subsystem insists that the
 507                  * memmap entries are valid from the bank end aligned to
 508                  * MAX_ORDER_NR_PAGES.
 509                  */
 510                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 511         }
 512
 513 #ifdef CONFIG_SPARSEMEM
 514         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
 515                 free_memmap(prev_bank_end,
 516                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
 517 #endif
 518 }
 519
 520 static void __init free_highpages(void)
 521 {
 522 #ifdef CONFIG_HIGHMEM
 523         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
 524         struct memblock_region *mem, *res;
 525
 526         /* set highmem page free */
 527         for_each_memblock(memory, mem) {
 528                 unsigned long start = memblock_region_memory_base_pfn(mem);
 529                 unsigned long end = memblock_region_memory_end_pfn(mem);
 530
 531                 /* Ignore complete lowmem entries */
 532                 if (end <= max_low)
 533                         continue;
 534
 535                 /* Truncate partial highmem entries */
 536                 if (start < max_low)
 537                         start = max_low;
 538
 539                 /* Find and exclude any reserved regions */
 540                 for_each_memblock(reserved, res) {
 541                         unsigned long res_start, res_end;
 542
 543                         res_start = memblock_region_reserved_base_pfn(res);
 544                         res_end = memblock_region_reserved_end_pfn(res);
 545
 546                         if (res_end < start)
 547                                 continue;
 548                         if (res_start < start)
 549                                 res_start = start;
 550                         if (res_start > end)
 551                                 res_start = end;
 552                         if (res_end > end)
 553                                 res_end = end;
 554                         if (res_start != start)
 555                                 totalhigh_pages += free_area(start, res_start,
 556                                                              NULL);
 557                         start = res_end;
 558                         if (start == end)
 559                                 break;
 560                 }
 561
 562                 /* And now free anything which remains */
 563                 if (start < end)
 564                         totalhigh_pages += free_area(start, end, NULL);
 565         }
 566         totalram_pages += totalhigh_pages;
 567 #endif
 568 }
 569
 570 /*
 571  * mem_init() marks the free areas in the mem_map and tells us how much
 572  * memory is free.  This is done after various parts of the system have
 573  * claimed their memory after the kernel image.
 574  */
 575 void __init mem_init(void)
 576 {
 577         unsigned long reserved_pages, free_pages;
 578         struct memblock_region *reg;
 579         int i;
 580 #ifdef CONFIG_HAVE_TCM
 581         /* These pointers are filled in on TCM detection */
 582         extern u32 dtcm_end;
 583         extern u32 itcm_end;
 584 #endif
 585
 586         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 587
 588         /* this will put all unused low memory onto the freelists */
 589         free_unused_memmap(&meminfo);
 590
 591         totalram_pages += free_all_bootmem();
 592
 593 #ifdef CONFIG_SA1111
 594         /* now that our DMA memory is actually so designated, we can free it */
 595         totalram_pages += free_area(PHYS_PFN_OFFSET,
 596                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 597 #endif
 598
 599         free_highpages();
 600
 601         reserved_pages = free_pages = 0;
 602
 603         for_each_bank(i, &meminfo) {
 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          * Since our memory may not be contiguous, calculate the
 625          * real number of pages we have in this system
 626          */
 627         printk(KERN_INFO "Memory:");
 628         num_physpages = 0;
 629         for_each_memblock(memory, reg) {
 630                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 631                         memblock_region_memory_base_pfn(reg);
 632                 num_physpages += pages;
 633                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 634         }
 635         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 636
 637         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 638                 nr_free_pages() << (PAGE_SHIFT-10),
 639                 free_pages << (PAGE_SHIFT-10),
 640                 reserved_pages << (PAGE_SHIFT-10),
 641                 totalhigh_pages << (PAGE_SHIFT-10));
 642
 643 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 644 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 645 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 646
 647         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 648                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 649 #ifdef CONFIG_HAVE_TCM
 650                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 651                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 652 #endif
 653                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 654 #ifdef CONFIG_MMU
 655                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 656 #endif
 657                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 658                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 659 #ifdef CONFIG_HIGHMEM
 660                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 661 #endif
 662                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 663                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 664                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 665                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
 666                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
 667
 668                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 669                                 (PAGE_SIZE)),
 670 #ifdef CONFIG_HAVE_TCM
 671                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 672                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 673 #endif
 674                         MLK(FIXADDR_START, FIXADDR_TOP),
 675 #ifdef CONFIG_MMU
 676                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 677 #endif
 678                         MLM(VMALLOC_START, VMALLOC_END),
 679                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 680 #ifdef CONFIG_HIGHMEM
 681                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 682                                 (PAGE_SIZE)),
 683 #endif
 684                         MLM(MODULES_VADDR, MODULES_END),
 685
 686                         MLK_ROUNDUP(_text, _etext),
 687                         MLK_ROUNDUP(__init_begin, __init_end),
 688                         MLK_ROUNDUP(_sdata, _edata),
 689                         MLK_ROUNDUP(__bss_start, __bss_stop));
 690
 691 #undef MLK
 692 #undef MLM
 693 #undef MLK_ROUNDUP
 694
 695         /*
 696          * Check boundaries twice: Some fundamental inconsistencies can
 697          * be detected at build time already.
 698          */
 699 #ifdef CONFIG_MMU
 700         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 701         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 702
 703         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 704         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 705 #endif
 706
 707 #ifdef CONFIG_HIGHMEM
 708         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 709         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 710 #endif
 711
 712         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 713                 extern int sysctl_overcommit_memory;
 714                 /*
 715                  * On a machine this small we won't get
 716                  * anywhere without overcommit, so turn
 717                  * it on by default.
 718                  */
 719                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 720         }
 721 }
 722
 723 void free_initmem(void)
 724 {
 725 #ifdef CONFIG_HAVE_TCM
 726         extern char __tcm_start, __tcm_end;
 727
 728         poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
 729         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 730                                     __phys_to_pfn(__pa(&__tcm_end)),
 731                                     "TCM link");
 732 #endif
 733
 734         poison_init_mem(__init_begin, __init_end - __init_begin);
 735         if (!machine_is_integrator() && !machine_is_cintegrator())
 736                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 737                                             __phys_to_pfn(__pa(__init_end)),
 738                                             "init");
 739 }
 740
 741 #ifdef CONFIG_BLK_DEV_INITRD
 742
 743 static int keep_initrd;
 744
 745 void free_initrd_mem(unsigned long start, unsigned long end)
 746 {
 747         if (!keep_initrd) {
 748                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
 749                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 750                                             __phys_to_pfn(__pa(end)),
 751                                             "initrd");
 752         }
 753 }
 754
 755 static int __init keepinitrd_setup(char *__unused)
 756 {
 757         keep_initrd = 1;
 758         return 1;
 759 }
 760
 761 __setup("keepinitrd", keepinitrd_setup);
 762 #endif