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/dma-contiguous.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         for_each_bank (i, mi) {
 102                 struct membank *bank = &mi->bank[i];
 103                 unsigned int pfn1, pfn2;
 104                 struct page *page, *end;
 105
 106                 pfn1 = bank_pfn_start(bank);
 107                 pfn2 = bank_pfn_end(bank);
 108
 109                 page = pfn_to_page(pfn1);
 110                 end  = pfn_to_page(pfn2 - 1) + 1;
 111
 112                 do {
 113                         total++;
 114                         if (PageReserved(page))
 115                                 reserved++;
 116                         else if (PageSwapCache(page))
 117                                 cached++;
 118                         else if (PageSlab(page))
 119                                 slab++;
 120                         else if (!page_count(page))
 121                                 free++;
 122                         else
 123                                 shared += page_count(page) - 1;
 124                         page++;
 125                 } while (page < end);
 126         }
 127
 128         printk("%d pages of RAM\n", total);
 129         printk("%d free pages\n", free);
 130         printk("%d reserved pages\n", reserved);
 131         printk("%d slab pages\n", slab);
 132         printk("%d pages shared\n", shared);
 133         printk("%d pages swap cached\n", cached);
 134 }
 135
 136 static void __init find_limits(unsigned long *min, unsigned long *max_low,
 137                                unsigned long *max_high)
 138 {
 139         struct meminfo *mi = &meminfo;
 140         int i;
 141
 142         /* This assumes the meminfo array is properly sorted */
 143         *min = bank_pfn_start(&mi->bank[0]);
 144         for_each_bank (i, mi)
 145                 if (mi->bank[i].highmem)
 146                                 break;
 147         *max_low = bank_pfn_end(&mi->bank[i - 1]);
 148         *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
 149 }
 150
 151 static void __init arm_bootmem_init(unsigned long start_pfn,
 152         unsigned long end_pfn)
 153 {
 154         struct memblock_region *reg;
 155         unsigned int boot_pages;
 156         phys_addr_t bitmap;
 157         pg_data_t *pgdat;
 158
 159         /*
 160          * Allocate the bootmem bitmap page.  This must be in a region
 161          * of memory which has already been mapped.
 162          */
 163         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 164         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
 165                                 __pfn_to_phys(end_pfn));
 166
 167         /*
 168          * Initialise the bootmem allocator, handing the
 169          * memory banks over to bootmem.
 170          */
 171         node_set_online(0);
 172         pgdat = NODE_DATA(0);
 173         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 174
 175         /* Free the lowmem regions from memblock into bootmem. */
 176         for_each_memblock(memory, reg) {
 177                 unsigned long start = memblock_region_memory_base_pfn(reg);
 178                 unsigned long end = memblock_region_memory_end_pfn(reg);
 179
 180                 if (end >= end_pfn)
 181                         end = end_pfn;
 182                 if (start >= end)
 183                         break;
 184
 185                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
 186         }
 187
 188         /* Reserve the lowmem memblock reserved regions in bootmem. */
 189         for_each_memblock(reserved, reg) {
 190                 unsigned long start = memblock_region_reserved_base_pfn(reg);
 191                 unsigned long end = memblock_region_reserved_end_pfn(reg);
 192
 193                 if (end >= end_pfn)
 194                         end = end_pfn;
 195                 if (start >= end)
 196                         break;
 197
 198                 reserve_bootmem(__pfn_to_phys(start),
 199                                 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
 200         }
 201 }
 202
 203 #ifdef CONFIG_ZONE_DMA
 204
 205 unsigned long arm_dma_zone_size __read_mostly;
 206 EXPORT_SYMBOL(arm_dma_zone_size);
 207
 208 /*
 209  * The DMA mask corresponding to the maximum bus address allocatable
 210  * using GFP_DMA.  The default here places no restriction on DMA
 211  * allocations.  This must be the smallest DMA mask in the system,
 212  * so a successful GFP_DMA allocation will always satisfy this.
 213  */
 214 u32 arm_dma_limit;
 215
 216 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
 217         unsigned long dma_size)
 218 {
 219         if (size[0] <= dma_size)
 220                 return;
 221
 222         size[ZONE_NORMAL] = size[0] - dma_size;
 223         size[ZONE_DMA] = dma_size;
 224         hole[ZONE_NORMAL] = hole[0];
 225         hole[ZONE_DMA] = 0;
 226 }
 227 #endif
 228
 229 void __init setup_dma_zone(struct machine_desc *mdesc)
 230 {
 231 #ifdef CONFIG_ZONE_DMA
 232         if (mdesc->dma_zone_size) {
 233                 arm_dma_zone_size = mdesc->dma_zone_size;
 234                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
 235         } else
 236                 arm_dma_limit = 0xffffffff;
 237 #endif
 238 }
 239
 240 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
 241         unsigned long max_high)
 242 {
 243         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 244         struct memblock_region *reg;
 245
 246         /*
 247          * initialise the zones.
 248          */
 249         memset(zone_size, 0, sizeof(zone_size));
 250
 251         /*
 252          * The memory size has already been determined.  If we need
 253          * to do anything fancy with the allocation of this memory
 254          * to the zones, now is the time to do it.
 255          */
 256         zone_size[0] = max_low - min;
 257 #ifdef CONFIG_HIGHMEM
 258         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 259 #endif
 260
 261         /*
 262          * Calculate the size of the holes.
 263          *  holes = node_size - sum(bank_sizes)
 264          */
 265         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 266         for_each_memblock(memory, reg) {
 267                 unsigned long start = memblock_region_memory_base_pfn(reg);
 268                 unsigned long end = memblock_region_memory_end_pfn(reg);
 269
 270                 if (start < max_low) {
 271                         unsigned long low_end = min(end, max_low);
 272                         zhole_size[0] -= low_end - start;
 273                 }
 274 #ifdef CONFIG_HIGHMEM
 275                 if (end > max_low) {
 276                         unsigned long high_start = max(start, max_low);
 277                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
 278                 }
 279 #endif
 280         }
 281
 282 #ifdef CONFIG_ZONE_DMA
 283         /*
 284          * Adjust the sizes according to any special requirements for
 285          * this machine type.
 286          */
 287         if (arm_dma_zone_size)
 288                 arm_adjust_dma_zone(zone_size, zhole_size,
 289                         arm_dma_zone_size >> PAGE_SHIFT);
 290 #endif
 291
 292         free_area_init_node(0, zone_size, min, zhole_size);
 293 }
 294
 295 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 296 int pfn_valid(unsigned long pfn)
 297 {
 298         return memblock_is_memory(__pfn_to_phys(pfn));
 299 }
 300 EXPORT_SYMBOL(pfn_valid);
 301 #endif
 302
 303 #ifndef CONFIG_SPARSEMEM
 304 static void arm_memory_present(void)
 305 {
 306 }
 307 #else
 308 static void arm_memory_present(void)
 309 {
 310         struct memblock_region *reg;
 311
 312         for_each_memblock(memory, reg)
 313                 memory_present(0, memblock_region_memory_base_pfn(reg),
 314                                memblock_region_memory_end_pfn(reg));
 315 }
 316 #endif
 317
 318 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 319 {
 320         int i;
 321
 322         memblock_init();
 323         for (i = 0; i < mi->nr_banks; i++)
 324                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 325
 326         /* Register the kernel text, kernel data and initrd with memblock. */
 327 #ifdef CONFIG_XIP_KERNEL
 328         memblock_reserve(__pa(_sdata), _end - _sdata);
 329 #else
 330         memblock_reserve(__pa(_stext), _end - _stext);
 331 #endif
 332 #ifdef CONFIG_BLK_DEV_INITRD
 333         if (phys_initrd_size &&
 334             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
 335                 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
 336                        phys_initrd_start, phys_initrd_size);
 337                 phys_initrd_start = phys_initrd_size = 0;
 338         }
 339         if (phys_initrd_size &&
 340             memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
 341                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
 342                        phys_initrd_start, phys_initrd_size);
 343                 phys_initrd_start = phys_initrd_size = 0;
 344         }
 345         if (phys_initrd_size) {
 346                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 347
 348                 /* Now convert initrd to virtual addresses */
 349                 initrd_start = __phys_to_virt(phys_initrd_start);
 350                 initrd_end = initrd_start + phys_initrd_size;
 351         }
 352 #endif
 353
 354         arm_mm_memblock_reserve();
 355         arm_dt_memblock_reserve();
 356
 357         /* reserve any platform specific memblock areas */
 358         if (mdesc->reserve)
 359                 mdesc->reserve();
 360
 361         /*
 362          * reserve memory for DMA contigouos allocations,
 363          * must come from DMA area inside low memory
 364          */
 365         dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit));
 366
 367         memblock_analyze();
 368         memblock_dump_all();
 369 }
 370
 371 void __init bootmem_init(void)
 372 {
 373         unsigned long min, max_low, max_high;
 374
 375         max_low = max_high = 0;
 376
 377         find_limits(&min, &max_low, &max_high);
 378
 379         arm_bootmem_init(min, max_low);
 380
 381         /*
 382          * Sparsemem tries to allocate bootmem in memory_present(),
 383          * so must be done after the fixed reservations
 384          */
 385         arm_memory_present();
 386
 387         /*
 388          * sparse_init() needs the bootmem allocator up and running.
 389          */
 390         sparse_init();
 391
 392         /*
 393          * Now free the memory - free_area_init_node needs
 394          * the sparse mem_map arrays initialized by sparse_init()
 395          * for memmap_init_zone(), otherwise all PFNs are invalid.
 396          */
 397         arm_bootmem_free(min, max_low, max_high);
 398
 399         /*
 400          * This doesn't seem to be used by the Linux memory manager any
 401          * more, but is used by ll_rw_block.  If we can get rid of it, we
 402          * also get rid of some of the stuff above as well.
 403          *
 404          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 405          * the system, not the maximum PFN.
 406          */
 407         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 408         max_pfn = max_high - PHYS_PFN_OFFSET;
 409 }
 410
 411 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 412 {
 413         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 414
 415         for (; pfn < end; pfn++) {
 416                 struct page *page = pfn_to_page(pfn);
 417                 ClearPageReserved(page);
 418                 init_page_count(page);
 419                 __free_page(page);
 420                 pages++;
 421         }
 422
 423         if (size && s)
 424                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 425
 426         return pages;
 427 }
 428
 429 /*
 430  * Poison init memory with an undefined instruction (ARM) or a branch to an
 431  * undefined instruction (Thumb).
 432  */
 433 static inline void poison_init_mem(void *s, size_t count)
 434 {
 435         u32 *p = (u32 *)s;
 436         for (; count != 0; count -= 4)
 437                 *p++ = 0xe7fddef0;
 438 }
 439
 440 static inline void
 441 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 442 {
 443         struct page *start_pg, *end_pg;
 444         unsigned long pg, pgend;
 445
 446         /*
 447          * Convert start_pfn/end_pfn to a struct page pointer.
 448          */
 449         start_pg = pfn_to_page(start_pfn - 1) + 1;
 450         end_pg = pfn_to_page(end_pfn - 1) + 1;
 451
 452         /*
 453          * Convert to physical addresses, and
 454          * round start upwards and end downwards.
 455          */
 456         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
 457         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
 458
 459         /*
 460          * If there are free pages between these,
 461          * free the section of the memmap array.
 462          */
 463         if (pg < pgend)
 464                 free_bootmem(pg, pgend - pg);
 465 }
 466
 467 /*
 468  * The mem_map array can get very big.  Free the unused area of the memory map.
 469  */
 470 static void __init free_unused_memmap(struct meminfo *mi)
 471 {
 472         unsigned long bank_start, prev_bank_end = 0;
 473         unsigned int i;
 474
 475         /*
 476          * This relies on each bank being in address order.
 477          * The banks are sorted previously in bootmem_init().
 478          */
 479         for_each_bank(i, mi) {
 480                 struct membank *bank = &mi->bank[i];
 481
 482                 bank_start = bank_pfn_start(bank);
 483
 484 #ifdef CONFIG_SPARSEMEM
 485                 /*
 486                  * Take care not to free memmap entries that don't exist
 487                  * due to SPARSEMEM sections which aren't present.
 488                  */
 489                 bank_start = min(bank_start,
 490                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
 491 #else
 492                 /*
 493                  * Align down here since the VM subsystem insists that the
 494                  * memmap entries are valid from the bank start aligned to
 495                  * MAX_ORDER_NR_PAGES.
 496                  */
 497                 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
 498 #endif
 499                 /*
 500                  * If we had a previous bank, and there is a space
 501                  * between the current bank and the previous, free it.
 502                  */
 503                 if (prev_bank_end && prev_bank_end < bank_start)
 504                         free_memmap(prev_bank_end, bank_start);
 505
 506                 /*
 507                  * Align up here since the VM subsystem insists that the
 508                  * memmap entries are valid from the bank end aligned to
 509                  * MAX_ORDER_NR_PAGES.
 510                  */
 511                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 512         }
 513
 514 #ifdef CONFIG_SPARSEMEM
 515         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
 516                 free_memmap(prev_bank_end,
 517                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
 518 #endif
 519 }
 520
 521 static void __init free_highpages(void)
 522 {
 523 #ifdef CONFIG_HIGHMEM
 524         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
 525         struct memblock_region *mem, *res;
 526
 527         /* set highmem page free */
 528         for_each_memblock(memory, mem) {
 529                 unsigned long start = memblock_region_memory_base_pfn(mem);
 530                 unsigned long end = memblock_region_memory_end_pfn(mem);
 531
 532                 /* Ignore complete lowmem entries */
 533                 if (end <= max_low)
 534                         continue;
 535
 536                 /* Truncate partial highmem entries */
 537                 if (start < max_low)
 538                         start = max_low;
 539
 540                 /* Find and exclude any reserved regions */
 541                 for_each_memblock(reserved, res) {
 542                         unsigned long res_start, res_end;
 543
 544                         res_start = memblock_region_reserved_base_pfn(res);
 545                         res_end = memblock_region_reserved_end_pfn(res);
 546
 547                         if (res_end < start)
 548                                 continue;
 549                         if (res_start < start)
 550                                 res_start = start;
 551                         if (res_start > end)
 552                                 res_start = end;
 553                         if (res_end > end)
 554                                 res_end = end;
 555                         if (res_start != start)
 556                                 totalhigh_pages += free_area(start, res_start,
 557                                                              NULL);
 558                         start = res_end;
 559                         if (start == end)
 560                                 break;
 561                 }
 562
 563                 /* And now free anything which remains */
 564                 if (start < end)
 565                         totalhigh_pages += free_area(start, end, NULL);
 566         }
 567         totalram_pages += totalhigh_pages;
 568 #endif
 569 }
 570
 571 /*
 572  * mem_init() marks the free areas in the mem_map and tells us how much
 573  * memory is free.  This is done after various parts of the system have
 574  * claimed their memory after the kernel image.
 575  */
 576 void __init mem_init(void)
 577 {
 578         unsigned long reserved_pages, free_pages;
 579         struct memblock_region *reg;
 580         int i;
 581 #ifdef CONFIG_HAVE_TCM
 582         /* These pointers are filled in on TCM detection */
 583         extern u32 dtcm_end;
 584         extern u32 itcm_end;
 585 #endif
 586
 587         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 588
 589         /* this will put all unused low memory onto the freelists */
 590         free_unused_memmap(&meminfo);
 591
 592         totalram_pages += free_all_bootmem();
 593
 594 #ifdef CONFIG_SA1111
 595         /* now that our DMA memory is actually so designated, we can free it */
 596         totalram_pages += free_area(PHYS_PFN_OFFSET,
 597                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 598 #endif
 599
 600         free_highpages();
 601
 602         reserved_pages = free_pages = 0;
 603
 604         for_each_bank(i, &meminfo) {
 605                 struct membank *bank = &meminfo.bank[i];
 606                 unsigned int pfn1, pfn2;
 607                 struct page *page, *end;
 608
 609                 pfn1 = bank_pfn_start(bank);
 610                 pfn2 = bank_pfn_end(bank);
 611
 612                 page = pfn_to_page(pfn1);
 613                 end  = pfn_to_page(pfn2 - 1) + 1;
 614
 615                 do {
 616                         if (PageReserved(page))
 617                                 reserved_pages++;
 618                         else if (!page_count(page))
 619                                 free_pages++;
 620                         page++;
 621                 } while (page < end);
 622         }
 623
 624         /*
 625          * Since our memory may not be contiguous, calculate the
 626          * real number of pages we have in this system
 627          */
 628         printk(KERN_INFO "Memory:");
 629         num_physpages = 0;
 630         for_each_memblock(memory, reg) {
 631                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 632                         memblock_region_memory_base_pfn(reg);
 633                 num_physpages += pages;
 634                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 635         }
 636         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 637
 638         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 639                 nr_free_pages() << (PAGE_SHIFT-10),
 640                 free_pages << (PAGE_SHIFT-10),
 641                 reserved_pages << (PAGE_SHIFT-10),
 642                 totalhigh_pages << (PAGE_SHIFT-10));
 643
 644 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 645 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 646 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 647
 648         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 649                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 650 #ifdef CONFIG_HAVE_TCM
 651                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 652                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 653 #endif
 654                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 655                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 656                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 657 #ifdef CONFIG_HIGHMEM
 658                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 659 #endif
 660                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 661                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 662                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 663                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
 664                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
 665
 666                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 667                                 (PAGE_SIZE)),
 668 #ifdef CONFIG_HAVE_TCM
 669                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 670                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 671 #endif
 672                         MLK(FIXADDR_START, FIXADDR_TOP),
 673                         MLM(VMALLOC_START, VMALLOC_END),
 674                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 675 #ifdef CONFIG_HIGHMEM
 676                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 677                                 (PAGE_SIZE)),
 678 #endif
 679                         MLM(MODULES_VADDR, MODULES_END),
 680
 681                         MLK_ROUNDUP(_text, _etext),
 682                         MLK_ROUNDUP(__init_begin, __init_end),
 683                         MLK_ROUNDUP(_sdata, _edata),
 684                         MLK_ROUNDUP(__bss_start, __bss_stop));
 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(TASK_SIZE                          > MODULES_VADDR);
 696         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 697 #endif
 698
 699 #ifdef CONFIG_HIGHMEM
 700         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 701         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 702 #endif
 703
 704         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 705                 extern int sysctl_overcommit_memory;
 706                 /*
 707                  * On a machine this small we won't get
 708                  * anywhere without overcommit, so turn
 709                  * it on by default.
 710                  */
 711                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 712         }
 713 }
 714
 715 void free_initmem(void)
 716 {
 717 #ifdef CONFIG_HAVE_TCM
 718         extern char __tcm_start, __tcm_end;
 719
 720         poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
 721         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 722                                     __phys_to_pfn(__pa(&__tcm_end)),
 723                                     "TCM link");
 724 #endif
 725
 726         poison_init_mem(__init_begin, __init_end - __init_begin);
 727         if (!machine_is_integrator() && !machine_is_cintegrator())
 728                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 729                                             __phys_to_pfn(__pa(__init_end)),
 730                                             "init");
 731 }
 732
 733 #ifdef CONFIG_BLK_DEV_INITRD
 734
 735 static int keep_initrd;
 736
 737 void free_initrd_mem(unsigned long start, unsigned long end)
 738 {
 739         if (!keep_initrd) {
 740                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
 741                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 742                                             __phys_to_pfn(__pa(end)),
 743                                             "initrd");
 744         }
 745 }
 746
 747 static int __init keepinitrd_setup(char *__unused)
 748 {
 749         keep_initrd = 1;
 750         return 1;
 751 }
 752
 753 __setup("keepinitrd", keepinitrd_setup);
 754 #endif