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         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         /* This assumes the meminfo array is properly sorted */
 146         *min = bank_pfn_start(&mi->bank[0]);
 147         for_each_bank (i, mi)
 148                 if (mi->bank[i].highmem)
 149                                 break;
 150         *max_low = bank_pfn_end(&mi->bank[i - 1]);
 151         *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
 152 }
 153
 154 static void __init arm_bootmem_init(unsigned long start_pfn,
 155         unsigned long end_pfn)
 156 {
 157         struct memblock_region *reg;
 158         unsigned int boot_pages;
 159         phys_addr_t bitmap;
 160         pg_data_t *pgdat;
 161
 162         /*
 163          * Allocate the bootmem bitmap page.  This must be in a region
 164          * of memory which has already been mapped.
 165          */
 166         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 167         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
 168                                 __pfn_to_phys(end_pfn));
 169
 170         /*
 171          * Initialise the bootmem allocator, handing the
 172          * memory banks over to bootmem.
 173          */
 174         node_set_online(0);
 175         pgdat = NODE_DATA(0);
 176         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 177
 178         /* Free the lowmem regions from memblock into bootmem. */
 179         for_each_memblock(memory, reg) {
 180                 unsigned long start = memblock_region_memory_base_pfn(reg);
 181                 unsigned long end = memblock_region_memory_end_pfn(reg);
 182
 183                 if (end >= end_pfn)
 184                         end = end_pfn;
 185                 if (start >= end)
 186                         break;
 187
 188                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
 189         }
 190
 191         /* Reserve the lowmem memblock reserved regions in bootmem. */
 192         for_each_memblock(reserved, reg) {
 193                 unsigned long start = memblock_region_reserved_base_pfn(reg);
 194                 unsigned long end = memblock_region_reserved_end_pfn(reg);
 195
 196                 if (end >= end_pfn)
 197                         end = end_pfn;
 198                 if (start >= end)
 199                         break;
 200
 201                 reserve_bootmem(__pfn_to_phys(start),
 202                                 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
 203         }
 204 }
 205
 206 #ifdef CONFIG_ZONE_DMA
 207
 208 unsigned long arm_dma_zone_size __read_mostly;
 209 EXPORT_SYMBOL(arm_dma_zone_size);
 210
 211 /*
 212  * The DMA mask corresponding to the maximum bus address allocatable
 213  * using GFP_DMA.  The default here places no restriction on DMA
 214  * allocations.  This must be the smallest DMA mask in the system,
 215  * so a successful GFP_DMA allocation will always satisfy this.
 216  */
 217 phys_addr_t arm_dma_limit;
 218
 219 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
 220         unsigned long dma_size)
 221 {
 222         if (size[0] <= dma_size)
 223                 return;
 224
 225         size[ZONE_NORMAL] = size[0] - dma_size;
 226         size[ZONE_DMA] = dma_size;
 227         hole[ZONE_NORMAL] = hole[0];
 228         hole[ZONE_DMA] = 0;
 229 }
 230 #endif
 231
 232 void __init setup_dma_zone(struct machine_desc *mdesc)
 233 {
 234 #ifdef CONFIG_ZONE_DMA
 235         if (mdesc->dma_zone_size) {
 236                 arm_dma_zone_size = mdesc->dma_zone_size;
 237                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
 238         } else
 239                 arm_dma_limit = 0xffffffff;
 240 #endif
 241 }
 242
 243 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
 244         unsigned long max_high)
 245 {
 246         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 247         struct memblock_region *reg;
 248
 249         /*
 250          * initialise the zones.
 251          */
 252         memset(zone_size, 0, sizeof(zone_size));
 253
 254         /*
 255          * The memory size has already been determined.  If we need
 256          * to do anything fancy with the allocation of this memory
 257          * to the zones, now is the time to do it.
 258          */
 259         zone_size[0] = max_low - min;
 260 #ifdef CONFIG_HIGHMEM
 261         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 262 #endif
 263
 264         /*
 265          * Calculate the size of the holes.
 266          *  holes = node_size - sum(bank_sizes)
 267          */
 268         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 269         for_each_memblock(memory, reg) {
 270                 unsigned long start = memblock_region_memory_base_pfn(reg);
 271                 unsigned long end = memblock_region_memory_end_pfn(reg);
 272
 273                 if (start < max_low) {
 274                         unsigned long low_end = min(end, max_low);
 275                         zhole_size[0] -= low_end - start;
 276                 }
 277 #ifdef CONFIG_HIGHMEM
 278                 if (end > max_low) {
 279                         unsigned long high_start = max(start, max_low);
 280                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
 281                 }
 282 #endif
 283         }
 284
 285 #ifdef CONFIG_ZONE_DMA
 286         /*
 287          * Adjust the sizes according to any special requirements for
 288          * this machine type.
 289          */
 290         if (arm_dma_zone_size)
 291                 arm_adjust_dma_zone(zone_size, zhole_size,
 292                         arm_dma_zone_size >> PAGE_SHIFT);
 293 #endif
 294
 295         free_area_init_node(0, zone_size, min, zhole_size);
 296 }
 297
 298 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 299 int pfn_valid(unsigned long pfn)
 300 {
 301         return memblock_is_memory(__pfn_to_phys(pfn));
 302 }
 303 EXPORT_SYMBOL(pfn_valid);
 304 #endif
 305
 306 #ifndef CONFIG_SPARSEMEM
 307 static void arm_memory_present(void)
 308 {
 309 }
 310 #else
 311 static void arm_memory_present(void)
 312 {
 313         struct memblock_region *reg;
 314
 315         for_each_memblock(memory, reg)
 316                 memory_present(0, memblock_region_memory_base_pfn(reg),
 317                                memblock_region_memory_end_pfn(reg));
 318 }
 319 #endif
 320
 321 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 322 {
 323         int i;
 324
 325         memblock_init();
 326         for (i = 0; i < mi->nr_banks; i++)
 327                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 328
 329         /* Register the kernel text, kernel data and initrd with memblock. */
 330 #ifdef CONFIG_XIP_KERNEL
 331         memblock_reserve(__pa(_sdata), _end - _sdata);
 332 #else
 333         memblock_reserve(__pa(_stext), _end - _stext);
 334 #endif
 335 #ifdef CONFIG_BLK_DEV_INITRD
 336         if (phys_initrd_size &&
 337             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
 338                 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
 339                        phys_initrd_start, phys_initrd_size);
 340                 phys_initrd_start = phys_initrd_size = 0;
 341         }
 342         if (phys_initrd_size &&
 343             memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
 344                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
 345                        phys_initrd_start, phys_initrd_size);
 346                 phys_initrd_start = phys_initrd_size = 0;
 347         }
 348         if (phys_initrd_size) {
 349                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 350
 351                 /* Now convert initrd to virtual addresses */
 352                 initrd_start = __phys_to_virt(phys_initrd_start);
 353                 initrd_end = initrd_start + phys_initrd_size;
 354         }
 355 #endif
 356
 357         arm_mm_memblock_reserve();
 358         arm_dt_memblock_reserve();
 359
 360         /* reserve any platform specific memblock areas */
 361         if (mdesc->reserve)
 362                 mdesc->reserve();
 363
 364         /*
 365          * reserve memory for DMA contigouos allocations,
 366          * must come from DMA area inside low memory
 367          */
 368         dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit));
 369
 370         memblock_analyze();
 371         memblock_dump_all();
 372 }
 373
 374 void __init bootmem_init(void)
 375 {
 376         unsigned long min, max_low, max_high;
 377
 378         max_low = max_high = 0;
 379
 380         find_limits(&min, &max_low, &max_high);
 381
 382         arm_bootmem_init(min, max_low);
 383
 384         /*
 385          * Sparsemem tries to allocate bootmem in memory_present(),
 386          * so must be done after the fixed reservations
 387          */
 388         arm_memory_present();
 389
 390         /*
 391          * sparse_init() needs the bootmem allocator up and running.
 392          */
 393         sparse_init();
 394
 395         /*
 396          * Now free the memory - free_area_init_node needs
 397          * the sparse mem_map arrays initialized by sparse_init()
 398          * for memmap_init_zone(), otherwise all PFNs are invalid.
 399          */
 400         arm_bootmem_free(min, max_low, max_high);
 401
 402         /*
 403          * This doesn't seem to be used by the Linux memory manager any
 404          * more, but is used by ll_rw_block.  If we can get rid of it, we
 405          * also get rid of some of the stuff above as well.
 406          *
 407          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 408          * the system, not the maximum PFN.
 409          */
 410         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 411         max_pfn = max_high - PHYS_PFN_OFFSET;
 412 }
 413
 414 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 415 {
 416         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 417
 418         for (; pfn < end; pfn++) {
 419                 struct page *page = pfn_to_page(pfn);
 420                 ClearPageReserved(page);
 421                 init_page_count(page);
 422                 __free_page(page);
 423                 pages++;
 424         }
 425
 426         if (size && s)
 427                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 428
 429         return pages;
 430 }
 431
 432 /*
 433  * Poison init memory with an undefined instruction (ARM) or a branch to an
 434  * undefined instruction (Thumb).
 435  */
 436 static inline void poison_init_mem(void *s, size_t count)
 437 {
 438         u32 *p = (u32 *)s;
 439         for (; count != 0; count -= 4)
 440                 *p++ = 0xe7fddef0;
 441 }
 442
 443 static inline void
 444 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 445 {
 446         struct page *start_pg, *end_pg;
 447         unsigned long pg, pgend;
 448
 449         /*
 450          * Convert start_pfn/end_pfn to a struct page pointer.
 451          */
 452         start_pg = pfn_to_page(start_pfn - 1) + 1;
 453         end_pg = pfn_to_page(end_pfn - 1) + 1;
 454
 455         /*
 456          * Convert to physical addresses, and
 457          * round start upwards and end downwards.
 458          */
 459         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
 460         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
 461
 462         /*
 463          * If there are free pages between these,
 464          * free the section of the memmap array.
 465          */
 466         if (pg < pgend)
 467                 free_bootmem(pg, pgend - pg);
 468 }
 469
 470 /*
 471  * The mem_map array can get very big.  Free the unused area of the memory map.
 472  */
 473 static void __init free_unused_memmap(struct meminfo *mi)
 474 {
 475         unsigned long bank_start, prev_bank_end = 0;
 476         unsigned int i;
 477
 478         /*
 479          * This relies on each bank being in address order.
 480          * The banks are sorted previously in bootmem_init().
 481          */
 482         for_each_bank(i, mi) {
 483                 struct membank *bank = &mi->bank[i];
 484
 485                 bank_start = bank_pfn_start(bank);
 486
 487 #ifdef CONFIG_SPARSEMEM
 488                 /*
 489                  * Take care not to free memmap entries that don't exist
 490                  * due to SPARSEMEM sections which aren't present.
 491                  */
 492                 bank_start = min(bank_start,
 493                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
 494 #else
 495                 /*
 496                  * Align down here since the VM subsystem insists that the
 497                  * memmap entries are valid from the bank start aligned to
 498                  * MAX_ORDER_NR_PAGES.
 499                  */
 500                 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
 501 #endif
 502                 /*
 503                  * If we had a previous bank, and there is a space
 504                  * between the current bank and the previous, free it.
 505                  */
 506                 if (prev_bank_end && prev_bank_end < bank_start)
 507                         free_memmap(prev_bank_end, bank_start);
 508
 509                 /*
 510                  * Align up here since the VM subsystem insists that the
 511                  * memmap entries are valid from the bank end aligned to
 512                  * MAX_ORDER_NR_PAGES.
 513                  */
 514                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 515         }
 516
 517 #ifdef CONFIG_SPARSEMEM
 518         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
 519                 free_memmap(prev_bank_end,
 520                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
 521 #endif
 522 }
 523
 524 static void __init free_highpages(void)
 525 {
 526 #ifdef CONFIG_HIGHMEM
 527         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
 528         struct memblock_region *mem, *res;
 529
 530         /* set highmem page free */
 531         for_each_memblock(memory, mem) {
 532                 unsigned long start = memblock_region_memory_base_pfn(mem);
 533                 unsigned long end = memblock_region_memory_end_pfn(mem);
 534
 535                 /* Ignore complete lowmem entries */
 536                 if (end <= max_low)
 537                         continue;
 538
 539                 /* Truncate partial highmem entries */
 540                 if (start < max_low)
 541                         start = max_low;
 542
 543                 /* Find and exclude any reserved regions */
 544                 for_each_memblock(reserved, res) {
 545                         unsigned long res_start, res_end;
 546
 547                         res_start = memblock_region_reserved_base_pfn(res);
 548                         res_end = memblock_region_reserved_end_pfn(res);
 549
 550                         if (res_end < start)
 551                                 continue;
 552                         if (res_start < start)
 553                                 res_start = start;
 554                         if (res_start > end)
 555                                 res_start = end;
 556                         if (res_end > end)
 557                                 res_end = end;
 558                         if (res_start != start)
 559                                 totalhigh_pages += free_area(start, res_start,
 560                                                              NULL);
 561                         start = res_end;
 562                         if (start == end)
 563                                 break;
 564                 }
 565
 566                 /* And now free anything which remains */
 567                 if (start < end)
 568                         totalhigh_pages += free_area(start, end, NULL);
 569         }
 570         totalram_pages += totalhigh_pages;
 571 #endif
 572 }
 573
 574 /*
 575  * mem_init() marks the free areas in the mem_map and tells us how much
 576  * memory is free.  This is done after various parts of the system have
 577  * claimed their memory after the kernel image.
 578  */
 579 void __init mem_init(void)
 580 {
 581         unsigned long reserved_pages, free_pages;
 582         struct memblock_region *reg;
 583         int i;
 584 #ifdef CONFIG_HAVE_TCM
 585         /* These pointers are filled in on TCM detection */
 586         extern u32 dtcm_end;
 587         extern u32 itcm_end;
 588 #endif
 589
 590         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 591
 592         /* this will put all unused low memory onto the freelists */
 593         free_unused_memmap(&meminfo);
 594
 595         totalram_pages += free_all_bootmem();
 596
 597 #ifdef CONFIG_SA1111
 598         /* now that our DMA memory is actually so designated, we can free it */
 599         totalram_pages += free_area(PHYS_PFN_OFFSET,
 600                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 601 #endif
 602
 603         free_highpages();
 604
 605         reserved_pages = free_pages = 0;
 606
 607         for_each_bank(i, &meminfo) {
 608                 struct membank *bank = &meminfo.bank[i];
 609                 unsigned int pfn1, pfn2;
 610                 struct page *page, *end;
 611
 612                 pfn1 = bank_pfn_start(bank);
 613                 pfn2 = bank_pfn_end(bank);
 614
 615                 page = pfn_to_page(pfn1);
 616                 end  = pfn_to_page(pfn2 - 1) + 1;
 617
 618                 do {
 619                         if (PageReserved(page))
 620                                 reserved_pages++;
 621                         else if (!page_count(page))
 622                                 free_pages++;
 623                         page++;
 624                 } while (page < end);
 625         }
 626
 627         /*
 628          * Since our memory may not be contiguous, calculate the
 629          * real number of pages we have in this system
 630          */
 631         printk(KERN_INFO "Memory:");
 632         num_physpages = 0;
 633         for_each_memblock(memory, reg) {
 634                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 635                         memblock_region_memory_base_pfn(reg);
 636                 num_physpages += pages;
 637                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 638         }
 639         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 640
 641         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 642                 nr_free_pages() << (PAGE_SHIFT-10),
 643                 free_pages << (PAGE_SHIFT-10),
 644                 reserved_pages << (PAGE_SHIFT-10),
 645                 totalhigh_pages << (PAGE_SHIFT-10));
 646
 647 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 648 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 649 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 650
 651         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 652                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 653 #ifdef CONFIG_HAVE_TCM
 654                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 655                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 656 #endif
 657                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 658                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 659                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 660 #ifdef CONFIG_HIGHMEM
 661                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 662 #endif
 663                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 664                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 665                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 666                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
 667                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
 668
 669                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 670                                 (PAGE_SIZE)),
 671 #ifdef CONFIG_HAVE_TCM
 672                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 673                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 674 #endif
 675                         MLK(FIXADDR_START, FIXADDR_TOP),
 676                         MLM(VMALLOC_START, VMALLOC_END),
 677                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 678 #ifdef CONFIG_HIGHMEM
 679                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 680                                 (PAGE_SIZE)),
 681 #endif
 682                         MLM(MODULES_VADDR, MODULES_END),
 683
 684                         MLK_ROUNDUP(_text, _etext),
 685                         MLK_ROUNDUP(__init_begin, __init_end),
 686                         MLK_ROUNDUP(_sdata, _edata),
 687                         MLK_ROUNDUP(__bss_start, __bss_stop));
 688
 689 #undef MLK
 690 #undef MLM
 691 #undef MLK_ROUNDUP
 692
 693         /*
 694          * Check boundaries twice: Some fundamental inconsistencies can
 695          * be detected at build time already.
 696          */
 697 #ifdef CONFIG_MMU
 698         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 699         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 700 #endif
 701
 702 #ifdef CONFIG_HIGHMEM
 703         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 704         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 705 #endif
 706
 707         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 708                 extern int sysctl_overcommit_memory;
 709                 /*
 710                  * On a machine this small we won't get
 711                  * anywhere without overcommit, so turn
 712                  * it on by default.
 713                  */
 714                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 715         }
 716 }
 717
 718 void free_initmem(void)
 719 {
 720 #ifdef CONFIG_HAVE_TCM
 721         extern char __tcm_start, __tcm_end;
 722
 723         poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
 724         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 725                                     __phys_to_pfn(__pa(&__tcm_end)),
 726                                     "TCM link");
 727 #endif
 728
 729         poison_init_mem(__init_begin, __init_end - __init_begin);
 730         if (!machine_is_integrator() && !machine_is_cintegrator())
 731                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 732                                             __phys_to_pfn(__pa(__init_end)),
 733                                             "init");
 734 }
 735
 736 #ifdef CONFIG_BLK_DEV_INITRD
 737
 738 static int keep_initrd;
 739
 740 void free_initrd_mem(unsigned long start, unsigned long end)
 741 {
 742         if (!keep_initrd) {
 743                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
 744                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 745                                             __phys_to_pfn(__pa(end)),
 746                                             "initrd");
 747         }
 748 }
 749
 750 static int __init keepinitrd_setup(char *__unused)
 751 {
 752         keep_initrd = 1;
 753         return 1;
 754 }
 755
 756 __setup("keepinitrd", keepinitrd_setup);
 757 #endif