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/export.h>
  17 #include <linux/nodemask.h>
  18 #include <linux/initrd.h>
  19 #include <linux/of_fdt.h>
  20 #include <linux/highmem.h>
  21 #include <linux/gfp.h>
  22 #include <linux/memblock.h>
  23 #include <linux/sort.h>
  24
  25 #include <asm/mach-types.h>
  26 #include <asm/prom.h>
  27 #include <asm/sections.h>
  28 #include <asm/setup.h>
  29 #include <asm/sizes.h>
  30 #include <asm/tlb.h>
  31 #include <asm/fixmap.h>
  32
  33 #include <asm/mach/arch.h>
  34 #include <asm/mach/map.h>
  35
  36 #include "mm.h"
  37
  38 static unsigned long phys_initrd_start __initdata = 0;
  39 static unsigned long phys_initrd_size __initdata = 0;
  40
  41 static int __init early_initrd(char *p)
  42 {
  43         unsigned long start, size;
  44         char *endp;
  45
  46         start = memparse(p, &endp);
  47         if (*endp == ',') {
  48                 size = memparse(endp + 1, NULL);
  49
  50                 phys_initrd_start = start;
  51                 phys_initrd_size = size;
  52         }
  53         return 0;
  54 }
  55 early_param("initrd", early_initrd);
  56
  57 static int __init parse_tag_initrd(const struct tag *tag)
  58 {
  59         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
  60                 "please update your bootloader.\n");
  61         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  62         phys_initrd_size = tag->u.initrd.size;
  63         return 0;
  64 }
  65
  66 __tagtable(ATAG_INITRD, parse_tag_initrd);
  67
  68 static int __init parse_tag_initrd2(const struct tag *tag)
  69 {
  70         phys_initrd_start = tag->u.initrd.start;
  71         phys_initrd_size = tag->u.initrd.size;
  72         return 0;
  73 }
  74
  75 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  76
  77 #ifdef CONFIG_OF_FLATTREE
  78 void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
  79 {
  80         phys_initrd_start = start;
  81         phys_initrd_size = end - start;
  82 }
  83 #endif /* CONFIG_OF_FLATTREE */
  84
  85 /*
  86  * This keeps memory configuration data used by a couple memory
  87  * initialization functions, as well as show_mem() for the skipping
  88  * of holes in the memory map.  It is populated by arm_add_memory().
  89  */
  90 struct meminfo meminfo;
  91
  92 void show_mem(unsigned int filter)
  93 {
  94         int free = 0, total = 0, reserved = 0;
  95         int shared = 0, cached = 0, slab = 0, i;
  96         struct meminfo * mi = &meminfo;
  97
  98         printk("Mem-info:\n");
  99         show_free_areas(filter);
 100
 101         if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
 102                 return;
 103
 104         for_each_bank (i, mi) {
 105                 struct membank *bank = &mi->bank[i];
 106                 unsigned int pfn1, pfn2;
 107                 struct page *page, *end;
 108
 109                 pfn1 = bank_pfn_start(bank);
 110                 pfn2 = bank_pfn_end(bank);
 111
 112                 page = pfn_to_page(pfn1);
 113                 end  = pfn_to_page(pfn2 - 1) + 1;
 114
 115                 do {
 116                         total++;
 117                         if (PageReserved(page))
 118                                 reserved++;
 119                         else if (PageSwapCache(page))
 120                                 cached++;
 121                         else if (PageSlab(page))
 122                                 slab++;
 123                         else if (!page_count(page))
 124                                 free++;
 125                         else
 126                                 shared += page_count(page) - 1;
 127                         page++;
 128                 } while (page < end);
 129         }
 130
 131         printk("%d pages of RAM\n", total);
 132         printk("%d free pages\n", free);
 133         printk("%d reserved pages\n", reserved);
 134         printk("%d slab pages\n", slab);
 135         printk("%d pages shared\n", shared);
 136         printk("%d pages swap cached\n", cached);
 137 }
 138
 139 static void __init find_limits(unsigned long *min, unsigned long *max_low,
 140         unsigned long *max_high)
 141 {
 142         struct meminfo *mi = &meminfo;
 143         int i;
 144
 145         *min = -1UL;
 146         *max_low = *max_high = 0;
 147
 148         for_each_bank (i, mi) {
 149                 struct membank *bank = &mi->bank[i];
 150                 unsigned long start, end;
 151
 152                 start = bank_pfn_start(bank);
 153                 end = bank_pfn_end(bank);
 154
 155                 if (*min > start)
 156                         *min = start;
 157                 if (*max_high < end)
 158                         *max_high = end;
 159                 if (bank->highmem)
 160                         continue;
 161                 if (*max_low < end)
 162                         *max_low = end;
 163         }
 164 }
 165
 166 static void __init arm_bootmem_init(unsigned long start_pfn,
 167         unsigned long end_pfn)
 168 {
 169         struct memblock_region *reg;
 170         unsigned int boot_pages;
 171         phys_addr_t bitmap;
 172         pg_data_t *pgdat;
 173
 174         /*
 175          * Allocate the bootmem bitmap page.  This must be in a region
 176          * of memory which has already been mapped.
 177          */
 178         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 179         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
 180                                 __pfn_to_phys(end_pfn));
 181
 182         /*
 183          * Initialise the bootmem allocator, handing the
 184          * memory banks over to bootmem.
 185          */
 186         node_set_online(0);
 187         pgdat = NODE_DATA(0);
 188         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 189
 190         /* Free the lowmem regions from memblock into bootmem. */
 191         for_each_memblock(memory, reg) {
 192                 unsigned long start = memblock_region_memory_base_pfn(reg);
 193                 unsigned long end = memblock_region_memory_end_pfn(reg);
 194
 195                 if (end >= end_pfn)
 196                         end = end_pfn;
 197                 if (start >= end)
 198                         break;
 199
 200                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
 201         }
 202
 203         /* Reserve the lowmem memblock reserved regions in bootmem. */
 204         for_each_memblock(reserved, reg) {
 205                 unsigned long start = memblock_region_reserved_base_pfn(reg);
 206                 unsigned long end = memblock_region_reserved_end_pfn(reg);
 207
 208                 if (end >= end_pfn)
 209                         end = end_pfn;
 210                 if (start >= end)
 211                         break;
 212
 213                 reserve_bootmem(__pfn_to_phys(start),
 214                                 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
 215         }
 216 }
 217
 218 #ifdef CONFIG_ZONE_DMA
 219
 220 unsigned long arm_dma_zone_size __read_mostly;
 221 EXPORT_SYMBOL(arm_dma_zone_size);
 222
 223 /*
 224  * The DMA mask corresponding to the maximum bus address allocatable
 225  * using GFP_DMA.  The default here places no restriction on DMA
 226  * allocations.  This must be the smallest DMA mask in the system,
 227  * so a successful GFP_DMA allocation will always satisfy this.
 228  */
 229 u32 arm_dma_limit;
 230
 231 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
 232         unsigned long dma_size)
 233 {
 234         if (size[0] <= dma_size)
 235                 return;
 236
 237         size[ZONE_NORMAL] = size[0] - dma_size;
 238         size[ZONE_DMA] = dma_size;
 239         hole[ZONE_NORMAL] = hole[0];
 240         hole[ZONE_DMA] = 0;
 241 }
 242 #endif
 243
 244 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
 245         unsigned long max_high)
 246 {
 247         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 248         struct memblock_region *reg;
 249
 250         /*
 251          * initialise the zones.
 252          */
 253         memset(zone_size, 0, sizeof(zone_size));
 254
 255         /*
 256          * The memory size has already been determined.  If we need
 257          * to do anything fancy with the allocation of this memory
 258          * to the zones, now is the time to do it.
 259          */
 260         zone_size[0] = max_low - min;
 261 #ifdef CONFIG_HIGHMEM
 262         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 263 #endif
 264
 265         /*
 266          * Calculate the size of the holes.
 267          *  holes = node_size - sum(bank_sizes)
 268          */
 269         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 270         for_each_memblock(memory, reg) {
 271                 unsigned long start = memblock_region_memory_base_pfn(reg);
 272                 unsigned long end = memblock_region_memory_end_pfn(reg);
 273
 274                 if (start < max_low) {
 275                         unsigned long low_end = min(end, max_low);
 276                         zhole_size[0] -= low_end - start;
 277                 }
 278 #ifdef CONFIG_HIGHMEM
 279                 if (end > max_low) {
 280                         unsigned long high_start = max(start, max_low);
 281                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
 282                 }
 283 #endif
 284         }
 285
 286 #ifdef CONFIG_ZONE_DMA
 287         /*
 288          * Adjust the sizes according to any special requirements for
 289          * this machine type.
 290          */
 291         if (arm_dma_zone_size) {
 292                 arm_adjust_dma_zone(zone_size, zhole_size,
 293                         arm_dma_zone_size >> PAGE_SHIFT);
 294                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
 295         } else
 296                 arm_dma_limit = 0xffffffff;
 297 #endif
 298
 299         free_area_init_node(0, zone_size, min, zhole_size);
 300 }
 301
 302 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 303 int pfn_valid(unsigned long pfn)
 304 {
 305         return memblock_is_memory(__pfn_to_phys(pfn));
 306 }
 307 EXPORT_SYMBOL(pfn_valid);
 308 #endif
 309
 310 #ifndef CONFIG_SPARSEMEM
 311 static void arm_memory_present(void)
 312 {
 313 }
 314 #else
 315 static void arm_memory_present(void)
 316 {
 317         struct memblock_region *reg;
 318
 319         for_each_memblock(memory, reg)
 320                 memory_present(0, memblock_region_memory_base_pfn(reg),
 321                                memblock_region_memory_end_pfn(reg));
 322 }
 323 #endif
 324
 325 static int __init meminfo_cmp(const void *_a, const void *_b)
 326 {
 327         const struct membank *a = _a, *b = _b;
 328         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
 329         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
 330 }
 331
 332 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 333 {
 334         int i;
 335
 336         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
 337
 338         memblock_init();
 339         for (i = 0; i < mi->nr_banks; i++)
 340                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 341
 342         /* Register the kernel text, kernel data and initrd with memblock. */
 343 #ifdef CONFIG_XIP_KERNEL
 344         memblock_reserve(__pa(_sdata), _end - _sdata);
 345 #else
 346         memblock_reserve(__pa(_stext), _end - _stext);
 347 #endif
 348 #ifdef CONFIG_BLK_DEV_INITRD
 349         if (phys_initrd_size &&
 350             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
 351                 pr_err("INITRD: 0x%08lx+0x%08lx is not a 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_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
 357                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
 358                        phys_initrd_start, phys_initrd_size);
 359                 phys_initrd_start = phys_initrd_size = 0;
 360         }
 361         if (phys_initrd_size) {
 362                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 363
 364                 /* Now convert initrd to virtual addresses */
 365                 initrd_start = __phys_to_virt(phys_initrd_start);
 366                 initrd_end = initrd_start + phys_initrd_size;
 367         }
 368 #endif
 369
 370         arm_mm_memblock_reserve();
 371         arm_dt_memblock_reserve();
 372
 373         /* reserve any platform specific memblock areas */
 374         if (mdesc->reserve)
 375                 mdesc->reserve();
 376
 377         memblock_analyze();
 378         memblock_dump_all();
 379 }
 380
 381 void __init bootmem_init(void)
 382 {
 383         unsigned long min, max_low, max_high;
 384
 385         max_low = max_high = 0;
 386
 387         find_limits(&min, &max_low, &max_high);
 388
 389         arm_bootmem_init(min, max_low);
 390
 391         /*
 392          * Sparsemem tries to allocate bootmem in memory_present(),
 393          * so must be done after the fixed reservations
 394          */
 395         arm_memory_present();
 396
 397         /*
 398          * sparse_init() needs the bootmem allocator up and running.
 399          */
 400         sparse_init();
 401
 402         /*
 403          * Now free the memory - free_area_init_node needs
 404          * the sparse mem_map arrays initialized by sparse_init()
 405          * for memmap_init_zone(), otherwise all PFNs are invalid.
 406          */
 407         arm_bootmem_free(min, max_low, max_high);
 408
 409         high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1;
 410
 411         /*
 412          * This doesn't seem to be used by the Linux memory manager any
 413          * more, but is used by ll_rw_block.  If we can get rid of it, we
 414          * also get rid of some of the stuff above as well.
 415          *
 416          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 417          * the system, not the maximum PFN.
 418          */
 419         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 420         max_pfn = max_high - PHYS_PFN_OFFSET;
 421 }
 422
 423 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 424 {
 425         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 426
 427         for (; pfn < end; pfn++) {
 428                 struct page *page = pfn_to_page(pfn);
 429                 ClearPageReserved(page);
 430                 init_page_count(page);
 431                 __free_page(page);
 432                 pages++;
 433         }
 434
 435         if (size && s)
 436                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 437
 438         return pages;
 439 }
 440
 441 /*
 442  * Poison init memory with an undefined instruction (ARM) or a branch to an
 443  * undefined instruction (Thumb).
 444  */
 445 static inline void poison_init_mem(void *s, size_t count)
 446 {
 447         u32 *p = (u32 *)s;
 448         for (; count != 0; count -= 4)
 449                 *p++ = 0xe7fddef0;
 450 }
 451
 452 static inline void
 453 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 454 {
 455         struct page *start_pg, *end_pg;
 456         unsigned long pg, pgend;
 457
 458         /*
 459          * Convert start_pfn/end_pfn to a struct page pointer.
 460          */
 461         start_pg = pfn_to_page(start_pfn - 1) + 1;
 462         end_pg = pfn_to_page(end_pfn - 1) + 1;
 463
 464         /*
 465          * Convert to physical addresses, and
 466          * round start upwards and end downwards.
 467          */
 468         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
 469         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
 470
 471         /*
 472          * If there are free pages between these,
 473          * free the section of the memmap array.
 474          */
 475         if (pg < pgend)
 476                 free_bootmem(pg, pgend - pg);
 477 }
 478
 479 /*
 480  * The mem_map array can get very big.  Free the unused area of the memory map.
 481  */
 482 static void __init free_unused_memmap(struct meminfo *mi)
 483 {
 484         unsigned long bank_start, prev_bank_end = 0;
 485         unsigned int i;
 486
 487         /*
 488          * This relies on each bank being in address order.
 489          * The banks are sorted previously in bootmem_init().
 490          */
 491         for_each_bank(i, mi) {
 492                 struct membank *bank = &mi->bank[i];
 493
 494                 bank_start = bank_pfn_start(bank);
 495
 496 #ifdef CONFIG_SPARSEMEM
 497                 /*
 498                  * Take care not to free memmap entries that don't exist
 499                  * due to SPARSEMEM sections which aren't present.
 500                  */
 501                 bank_start = min(bank_start,
 502                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
 503 #else
 504                 /*
 505                  * Align down here since the VM subsystem insists that the
 506                  * memmap entries are valid from the bank start aligned to
 507                  * MAX_ORDER_NR_PAGES.
 508                  */
 509                 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
 510 #endif
 511                 /*
 512                  * If we had a previous bank, and there is a space
 513                  * between the current bank and the previous, free it.
 514                  */
 515                 if (prev_bank_end && prev_bank_end < bank_start)
 516                         free_memmap(prev_bank_end, bank_start);
 517
 518                 /*
 519                  * Align up here since the VM subsystem insists that the
 520                  * memmap entries are valid from the bank end aligned to
 521                  * MAX_ORDER_NR_PAGES.
 522                  */
 523                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 524         }
 525
 526 #ifdef CONFIG_SPARSEMEM
 527         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
 528                 free_memmap(prev_bank_end,
 529                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
 530 #endif
 531 }
 532
 533 static void __init free_highpages(void)
 534 {
 535 #ifdef CONFIG_HIGHMEM
 536         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
 537         struct memblock_region *mem, *res;
 538
 539         /* set highmem page free */
 540         for_each_memblock(memory, mem) {
 541                 unsigned long start = memblock_region_memory_base_pfn(mem);
 542                 unsigned long end = memblock_region_memory_end_pfn(mem);
 543
 544                 /* Ignore complete lowmem entries */
 545                 if (end <= max_low)
 546                         continue;
 547
 548                 /* Truncate partial highmem entries */
 549                 if (start < max_low)
 550                         start = max_low;
 551
 552                 /* Find and exclude any reserved regions */
 553                 for_each_memblock(reserved, res) {
 554                         unsigned long res_start, res_end;
 555
 556                         res_start = memblock_region_reserved_base_pfn(res);
 557                         res_end = memblock_region_reserved_end_pfn(res);
 558
 559                         if (res_end < start)
 560                                 continue;
 561                         if (res_start < start)
 562                                 res_start = start;
 563                         if (res_start > end)
 564                                 res_start = end;
 565                         if (res_end > end)
 566                                 res_end = end;
 567                         if (res_start != start)
 568                                 totalhigh_pages += free_area(start, res_start,
 569                                                              NULL);
 570                         start = res_end;
 571                         if (start == end)
 572                                 break;
 573                 }
 574
 575                 /* And now free anything which remains */
 576                 if (start < end)
 577                         totalhigh_pages += free_area(start, end, NULL);
 578         }
 579         totalram_pages += totalhigh_pages;
 580 #endif
 581 }
 582
 583 /*
 584  * mem_init() marks the free areas in the mem_map and tells us how much
 585  * memory is free.  This is done after various parts of the system have
 586  * claimed their memory after the kernel image.
 587  */
 588 void __init mem_init(void)
 589 {
 590         unsigned long reserved_pages, free_pages;
 591         struct memblock_region *reg;
 592         int i;
 593 #ifdef CONFIG_HAVE_TCM
 594         /* These pointers are filled in on TCM detection */
 595         extern u32 dtcm_end;
 596         extern u32 itcm_end;
 597 #endif
 598
 599         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 600
 601         /* this will put all unused low memory onto the freelists */
 602         free_unused_memmap(&meminfo);
 603
 604         totalram_pages += free_all_bootmem();
 605
 606 #ifdef CONFIG_SA1111
 607         /* now that our DMA memory is actually so designated, we can free it */
 608         totalram_pages += free_area(PHYS_PFN_OFFSET,
 609                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 610 #endif
 611
 612         free_highpages();
 613
 614         reserved_pages = free_pages = 0;
 615
 616         for_each_bank(i, &meminfo) {
 617                 struct membank *bank = &meminfo.bank[i];
 618                 unsigned int pfn1, pfn2;
 619                 struct page *page, *end;
 620
 621                 pfn1 = bank_pfn_start(bank);
 622                 pfn2 = bank_pfn_end(bank);
 623
 624                 page = pfn_to_page(pfn1);
 625                 end  = pfn_to_page(pfn2 - 1) + 1;
 626
 627                 do {
 628                         if (PageReserved(page))
 629                                 reserved_pages++;
 630                         else if (!page_count(page))
 631                                 free_pages++;
 632                         page++;
 633                 } while (page < end);
 634         }
 635
 636         /*
 637          * Since our memory may not be contiguous, calculate the
 638          * real number of pages we have in this system
 639          */
 640         printk(KERN_INFO "Memory:");
 641         num_physpages = 0;
 642         for_each_memblock(memory, reg) {
 643                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 644                         memblock_region_memory_base_pfn(reg);
 645                 num_physpages += pages;
 646                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 647         }
 648         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 649
 650         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 651                 nr_free_pages() << (PAGE_SHIFT-10),
 652                 free_pages << (PAGE_SHIFT-10),
 653                 reserved_pages << (PAGE_SHIFT-10),
 654                 totalhigh_pages << (PAGE_SHIFT-10));
 655
 656 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 657 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 658 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 659
 660         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 661                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 662 #ifdef CONFIG_HAVE_TCM
 663                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 664                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 665 #endif
 666                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 667                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 668                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 669 #ifdef CONFIG_HIGHMEM
 670                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 671 #endif
 672                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 673                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 674                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 675                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
 676                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
 677
 678                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 679                                 (PAGE_SIZE)),
 680 #ifdef CONFIG_HAVE_TCM
 681                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 682                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 683 #endif
 684                         MLK(FIXADDR_START, FIXADDR_TOP),
 685                         MLM(VMALLOC_START, VMALLOC_END),
 686                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 687 #ifdef CONFIG_HIGHMEM
 688                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 689                                 (PAGE_SIZE)),
 690 #endif
 691                         MLM(MODULES_VADDR, MODULES_END),
 692
 693                         MLK_ROUNDUP(_text, _etext),
 694                         MLK_ROUNDUP(__init_begin, __init_end),
 695                         MLK_ROUNDUP(_sdata, _edata),
 696                         MLK_ROUNDUP(__bss_start, __bss_stop));
 697
 698 #undef MLK
 699 #undef MLM
 700 #undef MLK_ROUNDUP
 701
 702         /*
 703          * Check boundaries twice: Some fundamental inconsistencies can
 704          * be detected at build time already.
 705          */
 706 #ifdef CONFIG_MMU
 707         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 708         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 709 #endif
 710
 711 #ifdef CONFIG_HIGHMEM
 712         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 713         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 714 #endif
 715
 716         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 717                 extern int sysctl_overcommit_memory;
 718                 /*
 719                  * On a machine this small we won't get
 720                  * anywhere without overcommit, so turn
 721                  * it on by default.
 722                  */
 723                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 724         }
 725 }
 726
 727 void free_initmem(void)
 728 {
 729 #ifdef CONFIG_HAVE_TCM
 730         extern char __tcm_start, __tcm_end;
 731
 732         poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
 733         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 734                                     __phys_to_pfn(__pa(&__tcm_end)),
 735                                     "TCM link");
 736 #endif
 737
 738         poison_init_mem(__init_begin, __init_end - __init_begin);
 739         if (!machine_is_integrator() && !machine_is_cintegrator())
 740                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 741                                             __phys_to_pfn(__pa(__init_end)),
 742                                             "init");
 743 }
 744
 745 #ifdef CONFIG_BLK_DEV_INITRD
 746
 747 static int keep_initrd;
 748
 749 void free_initrd_mem(unsigned long start, unsigned long end)
 750 {
 751         if (!keep_initrd) {
 752                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
 753                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 754                                             __phys_to_pfn(__pa(end)),
 755                                             "initrd");
 756         }
 757 }
 758
 759 static int __init keepinitrd_setup(char *__unused)
 760 {
 761         keep_initrd = 1;
 762         return 1;
 763 }
 764
 765 __setup("keepinitrd", keepinitrd_setup);
 766 #endif