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 #include <linux/sizes.h>
  25
  26 #include <asm/mach-types.h>
  27 #include <asm/memblock.h>
  28 #include <asm/prom.h>
  29 #include <asm/sections.h>
  30 #include <asm/setup.h>
  31 #include <asm/tlb.h>
  32 #include <asm/fixmap.h>
  33
  34 #include <asm/mach/arch.h>
  35 #include <asm/mach/map.h>
  36
  37 #include "mm.h"
  38
  39 static unsigned long phys_initrd_start __initdata = 0;
  40 static unsigned long phys_initrd_size __initdata = 0;
  41
  42 static int __init early_initrd(char *p)
  43 {
  44         unsigned long start, size;
  45         char *endp;
  46
  47         start = memparse(p, &endp);
  48         if (*endp == ',') {
  49                 size = memparse(endp + 1, NULL);
  50
  51                 phys_initrd_start = start;
  52                 phys_initrd_size = size;
  53         }
  54         return 0;
  55 }
  56 early_param("initrd", early_initrd);
  57
  58 static int __init parse_tag_initrd(const struct tag *tag)
  59 {
  60         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
  61                 "please update your bootloader.\n");
  62         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  63         phys_initrd_size = tag->u.initrd.size;
  64         return 0;
  65 }
  66
  67 __tagtable(ATAG_INITRD, parse_tag_initrd);
  68
  69 static int __init parse_tag_initrd2(const struct tag *tag)
  70 {
  71         phys_initrd_start = tag->u.initrd.start;
  72         phys_initrd_size = tag->u.initrd.size;
  73         return 0;
  74 }
  75
  76 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  77
  78 #ifdef CONFIG_OF_FLATTREE
  79 void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
  80 {
  81         phys_initrd_start = start;
  82         phys_initrd_size = end - start;
  83 }
  84 #endif /* CONFIG_OF_FLATTREE */
  85
  86 /*
  87  * This keeps memory configuration data used by a couple memory
  88  * initialization functions, as well as show_mem() for the skipping
  89  * of holes in the memory map.  It is populated by arm_add_memory().
  90  */
  91 struct meminfo meminfo;
  92
  93 void show_mem(unsigned int filter)
  94 {
  95         int free = 0, total = 0, reserved = 0;
  96         int shared = 0, cached = 0, slab = 0, i;
  97         struct meminfo * mi = &meminfo;
  98
  99         printk("Mem-info:\n");
 100         show_free_areas(filter);
 101
 102         if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
 103                 return;
 104
 105         for_each_bank (i, mi) {
 106                 struct membank *bank = &mi->bank[i];
 107                 unsigned int pfn1, pfn2;
 108                 struct page *page, *end;
 109
 110                 pfn1 = bank_pfn_start(bank);
 111                 pfn2 = bank_pfn_end(bank);
 112
 113                 page = pfn_to_page(pfn1);
 114                 end  = pfn_to_page(pfn2 - 1) + 1;
 115
 116                 do {
 117                         total++;
 118                         if (PageReserved(page))
 119                                 reserved++;
 120                         else if (PageSwapCache(page))
 121                                 cached++;
 122                         else if (PageSlab(page))
 123                                 slab++;
 124                         else if (!page_count(page))
 125                                 free++;
 126                         else
 127                                 shared += page_count(page) - 1;
 128                         page++;
 129                 } while (page < end);
 130         }
 131
 132         printk("%d pages of RAM\n", total);
 133         printk("%d free pages\n", free);
 134         printk("%d reserved pages\n", reserved);
 135         printk("%d slab pages\n", slab);
 136         printk("%d pages shared\n", shared);
 137         printk("%d pages swap cached\n", cached);
 138 }
 139
 140 static void __init find_limits(unsigned long *min, unsigned long *max_low,
 141                                unsigned long *max_high)
 142 {
 143         struct meminfo *mi = &meminfo;
 144         int i;
 145
 146         /* This assumes the meminfo array is properly sorted */
 147         *min = bank_pfn_start(&mi->bank[0]);
 148         for_each_bank (i, mi)
 149                 if (mi->bank[i].highmem)
 150                                 break;
 151         *max_low = bank_pfn_end(&mi->bank[i - 1]);
 152         *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
 153 }
 154
 155 static void __init arm_bootmem_init(unsigned long start_pfn,
 156         unsigned long end_pfn)
 157 {
 158         struct memblock_region *reg;
 159         unsigned int boot_pages;
 160         phys_addr_t bitmap;
 161         pg_data_t *pgdat;
 162
 163         /*
 164          * Allocate the bootmem bitmap page.  This must be in a region
 165          * of memory which has already been mapped.
 166          */
 167         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 168         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
 169                                 __pfn_to_phys(end_pfn));
 170
 171         /*
 172          * Initialise the bootmem allocator, handing the
 173          * memory banks over to bootmem.
 174          */
 175         node_set_online(0);
 176         pgdat = NODE_DATA(0);
 177         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 178
 179         /* Free the lowmem regions from memblock into bootmem. */
 180         for_each_memblock(memory, reg) {
 181                 unsigned long start = memblock_region_memory_base_pfn(reg);
 182                 unsigned long end = memblock_region_memory_end_pfn(reg);
 183
 184                 if (end >= end_pfn)
 185                         end = end_pfn;
 186                 if (start >= end)
 187                         break;
 188
 189                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
 190         }
 191
 192         /* Reserve the lowmem memblock reserved regions in bootmem. */
 193         for_each_memblock(reserved, reg) {
 194                 unsigned long start = memblock_region_reserved_base_pfn(reg);
 195                 unsigned long end = memblock_region_reserved_end_pfn(reg);
 196
 197                 if (end >= end_pfn)
 198                         end = end_pfn;
 199                 if (start >= end)
 200                         break;
 201
 202                 reserve_bootmem(__pfn_to_phys(start),
 203                                 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
 204         }
 205 }
 206
 207 #ifdef CONFIG_ZONE_DMA
 208
 209 unsigned long arm_dma_zone_size __read_mostly;
 210 EXPORT_SYMBOL(arm_dma_zone_size);
 211
 212 /*
 213  * The DMA mask corresponding to the maximum bus address allocatable
 214  * using GFP_DMA.  The default here places no restriction on DMA
 215  * allocations.  This must be the smallest DMA mask in the system,
 216  * so a successful GFP_DMA allocation will always satisfy this.
 217  */
 218 phys_addr_t arm_dma_limit;
 219
 220 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
 221         unsigned long dma_size)
 222 {
 223         if (size[0] <= dma_size)
 224                 return;
 225
 226         size[ZONE_NORMAL] = size[0] - dma_size;
 227         size[ZONE_DMA] = dma_size;
 228         hole[ZONE_NORMAL] = hole[0];
 229         hole[ZONE_DMA] = 0;
 230 }
 231 #endif
 232
 233 void __init setup_dma_zone(struct machine_desc *mdesc)
 234 {
 235 #ifdef CONFIG_ZONE_DMA
 236         if (mdesc->dma_zone_size) {
 237                 arm_dma_zone_size = mdesc->dma_zone_size;
 238                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
 239         } else
 240                 arm_dma_limit = 0xffffffff;
 241 #endif
 242 }
 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 #endif
 295
 296         free_area_init_node(0, zone_size, min, zhole_size);
 297 }
 298
 299 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 300 int pfn_valid(unsigned long pfn)
 301 {
 302         return memblock_is_memory(__pfn_to_phys(pfn));
 303 }
 304 EXPORT_SYMBOL(pfn_valid);
 305 #endif
 306
 307 #ifndef CONFIG_SPARSEMEM
 308 static void __init arm_memory_present(void)
 309 {
 310 }
 311 #else
 312 static void __init arm_memory_present(void)
 313 {
 314         struct memblock_region *reg;
 315
 316         for_each_memblock(memory, reg)
 317                 memory_present(0, memblock_region_memory_base_pfn(reg),
 318                                memblock_region_memory_end_pfn(reg));
 319 }
 320 #endif
 321
 322 static bool arm_memblock_steal_permitted = true;
 323
 324 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
 325 {
 326         phys_addr_t phys;
 327
 328         BUG_ON(!arm_memblock_steal_permitted);
 329
 330         phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
 331         memblock_free(phys, size);
 332         memblock_remove(phys, size);
 333
 334         return phys;
 335 }
 336
 337 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 338 {
 339         int i;
 340
 341         for (i = 0; i < mi->nr_banks; i++)
 342                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 343
 344         /* Register the kernel text, kernel data and initrd with memblock. */
 345 #ifdef CONFIG_XIP_KERNEL
 346         memblock_reserve(__pa(_sdata), _end - _sdata);
 347 #else
 348         memblock_reserve(__pa(_stext), _end - _stext);
 349 #endif
 350 #ifdef CONFIG_BLK_DEV_INITRD
 351         if (phys_initrd_size &&
 352             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
 353                 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
 354                        phys_initrd_start, phys_initrd_size);
 355                 phys_initrd_start = phys_initrd_size = 0;
 356         }
 357         if (phys_initrd_size &&
 358             memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
 359                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
 360                        phys_initrd_start, phys_initrd_size);
 361                 phys_initrd_start = phys_initrd_size = 0;
 362         }
 363         if (phys_initrd_size) {
 364                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 365
 366                 /* Now convert initrd to virtual addresses */
 367                 initrd_start = __phys_to_virt(phys_initrd_start);
 368                 initrd_end = initrd_start + phys_initrd_size;
 369         }
 370 #endif
 371
 372         arm_mm_memblock_reserve();
 373         arm_dt_memblock_reserve();
 374
 375         /* reserve any platform specific memblock areas */
 376         if (mdesc->reserve)
 377                 mdesc->reserve();
 378
 379         /*
 380          * reserve memory for DMA contigouos allocations,
 381          * must come from DMA area inside low memory
 382          */
 383         dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit));
 384
 385         arm_memblock_steal_permitted = false;
 386         memblock_allow_resize();
 387         memblock_dump_all();
 388 }
 389
 390 void __init bootmem_init(void)
 391 {
 392         unsigned long min, max_low, max_high;
 393
 394         max_low = max_high = 0;
 395
 396         find_limits(&min, &max_low, &max_high);
 397
 398         arm_bootmem_init(min, max_low);
 399
 400         /*
 401          * Sparsemem tries to allocate bootmem in memory_present(),
 402          * so must be done after the fixed reservations
 403          */
 404         arm_memory_present();
 405
 406         /*
 407          * sparse_init() needs the bootmem allocator up and running.
 408          */
 409         sparse_init();
 410
 411         /*
 412          * Now free the memory - free_area_init_node needs
 413          * the sparse mem_map arrays initialized by sparse_init()
 414          * for memmap_init_zone(), otherwise all PFNs are invalid.
 415          */
 416         arm_bootmem_free(min, max_low, max_high);
 417
 418         /*
 419          * This doesn't seem to be used by the Linux memory manager any
 420          * more, but is used by ll_rw_block.  If we can get rid of it, we
 421          * also get rid of some of the stuff above as well.
 422          *
 423          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 424          * the system, not the maximum PFN.
 425          */
 426         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 427         max_pfn = max_high - PHYS_PFN_OFFSET;
 428 }
 429
 430 /*
 431  * Poison init memory with an undefined instruction (ARM) or a branch to an
 432  * undefined instruction (Thumb).
 433  */
 434 static inline void poison_init_mem(void *s, size_t count)
 435 {
 436         u32 *p = (u32 *)s;
 437         for (; count != 0; count -= 4)
 438                 *p++ = 0xe7fddef0;
 439 }
 440
 441 static inline void
 442 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 443 {
 444         struct page *start_pg, *end_pg;
 445         unsigned long pg, pgend;
 446
 447         /*
 448          * Convert start_pfn/end_pfn to a struct page pointer.
 449          */
 450         start_pg = pfn_to_page(start_pfn - 1) + 1;
 451         end_pg = pfn_to_page(end_pfn - 1) + 1;
 452
 453         /*
 454          * Convert to physical addresses, and
 455          * round start upwards and end downwards.
 456          */
 457         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
 458         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
 459
 460         /*
 461          * If there are free pages between these,
 462          * free the section of the memmap array.
 463          */
 464         if (pg < pgend)
 465                 free_bootmem(pg, pgend - pg);
 466 }
 467
 468 /*
 469  * The mem_map array can get very big.  Free the unused area of the memory map.
 470  */
 471 static void __init free_unused_memmap(struct meminfo *mi)
 472 {
 473         unsigned long bank_start, prev_bank_end = 0;
 474         unsigned int i;
 475
 476         /*
 477          * This relies on each bank being in address order.
 478          * The banks are sorted previously in bootmem_init().
 479          */
 480         for_each_bank(i, mi) {
 481                 struct membank *bank = &mi->bank[i];
 482
 483                 bank_start = bank_pfn_start(bank);
 484
 485 #ifdef CONFIG_SPARSEMEM
 486                 /*
 487                  * Take care not to free memmap entries that don't exist
 488                  * due to SPARSEMEM sections which aren't present.
 489                  */
 490                 bank_start = min(bank_start,
 491                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
 492 #else
 493                 /*
 494                  * Align down here since the VM subsystem insists that the
 495                  * memmap entries are valid from the bank start aligned to
 496                  * MAX_ORDER_NR_PAGES.
 497                  */
 498                 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
 499 #endif
 500                 /*
 501                  * If we had a previous bank, and there is a space
 502                  * between the current bank and the previous, free it.
 503                  */
 504                 if (prev_bank_end && prev_bank_end < bank_start)
 505                         free_memmap(prev_bank_end, bank_start);
 506
 507                 /*
 508                  * Align up here since the VM subsystem insists that the
 509                  * memmap entries are valid from the bank end aligned to
 510                  * MAX_ORDER_NR_PAGES.
 511                  */
 512                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 513         }
 514
 515 #ifdef CONFIG_SPARSEMEM
 516         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
 517                 free_memmap(prev_bank_end,
 518                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
 519 #endif
 520 }
 521
 522 #ifdef CONFIG_HIGHMEM
 523 static inline void free_area_high(unsigned long pfn, unsigned long end)
 524 {
 525         for (; pfn < end; pfn++)
 526                 free_highmem_page(pfn_to_page(pfn));
 527 }
 528 #endif
 529
 530 static void __init free_highpages(void)
 531 {
 532 #ifdef CONFIG_HIGHMEM
 533         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
 534         struct memblock_region *mem, *res;
 535
 536         /* set highmem page free */
 537         for_each_memblock(memory, mem) {
 538                 unsigned long start = memblock_region_memory_base_pfn(mem);
 539                 unsigned long end = memblock_region_memory_end_pfn(mem);
 540
 541                 /* Ignore complete lowmem entries */
 542                 if (end <= max_low)
 543                         continue;
 544
 545                 /* Truncate partial highmem entries */
 546                 if (start < max_low)
 547                         start = max_low;
 548
 549                 /* Find and exclude any reserved regions */
 550                 for_each_memblock(reserved, res) {
 551                         unsigned long res_start, res_end;
 552
 553                         res_start = memblock_region_reserved_base_pfn(res);
 554                         res_end = memblock_region_reserved_end_pfn(res);
 555
 556                         if (res_end < start)
 557                                 continue;
 558                         if (res_start < start)
 559                                 res_start = start;
 560                         if (res_start > end)
 561                                 res_start = end;
 562                         if (res_end > end)
 563                                 res_end = end;
 564                         if (res_start != start)
 565                                 free_area_high(start, res_start);
 566                         start = res_end;
 567                         if (start == end)
 568                                 break;
 569                 }
 570
 571                 /* And now free anything which remains */
 572                 if (start < end)
 573                         free_area_high(start, end);
 574         }
 575 #endif
 576 }
 577
 578 /*
 579  * mem_init() marks the free areas in the mem_map and tells us how much
 580  * memory is free.  This is done after various parts of the system have
 581  * claimed their memory after the kernel image.
 582  */
 583 void __init mem_init(void)
 584 {
 585         unsigned long reserved_pages, free_pages;
 586         struct memblock_region *reg;
 587         int i;
 588 #ifdef CONFIG_HAVE_TCM
 589         /* These pointers are filled in on TCM detection */
 590         extern u32 dtcm_end;
 591         extern u32 itcm_end;
 592 #endif
 593
 594         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 595
 596         /* this will put all unused low memory onto the freelists */
 597         free_unused_memmap(&meminfo);
 598
 599         totalram_pages += free_all_bootmem();
 600
 601 #ifdef CONFIG_SA1111
 602         /* now that our DMA memory is actually so designated, we can free it */
 603         free_reserved_area(__va(PHYS_PFN_OFFSET), swapper_pg_dir, 0, NULL);
 604 #endif
 605
 606         free_highpages();
 607
 608         reserved_pages = free_pages = 0;
 609
 610         for_each_bank(i, &meminfo) {
 611                 struct membank *bank = &meminfo.bank[i];
 612                 unsigned int pfn1, pfn2;
 613                 struct page *page, *end;
 614
 615                 pfn1 = bank_pfn_start(bank);
 616                 pfn2 = bank_pfn_end(bank);
 617
 618                 page = pfn_to_page(pfn1);
 619                 end  = pfn_to_page(pfn2 - 1) + 1;
 620
 621                 do {
 622                         if (PageReserved(page))
 623                                 reserved_pages++;
 624                         else if (!page_count(page))
 625                                 free_pages++;
 626                         page++;
 627                 } while (page < end);
 628         }
 629
 630         /*
 631          * Since our memory may not be contiguous, calculate the
 632          * real number of pages we have in this system
 633          */
 634         printk(KERN_INFO "Memory:");
 635         num_physpages = 0;
 636         for_each_memblock(memory, reg) {
 637                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 638                         memblock_region_memory_base_pfn(reg);
 639                 num_physpages += pages;
 640                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 641         }
 642         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 643
 644         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 645                 nr_free_pages() << (PAGE_SHIFT-10),
 646                 free_pages << (PAGE_SHIFT-10),
 647                 reserved_pages << (PAGE_SHIFT-10),
 648                 totalhigh_pages << (PAGE_SHIFT-10));
 649
 650 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 651 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 652 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 653
 654         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 655                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 656 #ifdef CONFIG_HAVE_TCM
 657                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 658                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 659 #endif
 660                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 661                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 662                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 663 #ifdef CONFIG_HIGHMEM
 664                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 665 #endif
 666 #ifdef CONFIG_MODULES
 667                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 668 #endif
 669                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 670                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 671                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
 672                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
 673
 674                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 675                                 (PAGE_SIZE)),
 676 #ifdef CONFIG_HAVE_TCM
 677                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 678                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 679 #endif
 680                         MLK(FIXADDR_START, FIXADDR_TOP),
 681                         MLM(VMALLOC_START, VMALLOC_END),
 682                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 683 #ifdef CONFIG_HIGHMEM
 684                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 685                                 (PAGE_SIZE)),
 686 #endif
 687 #ifdef CONFIG_MODULES
 688                         MLM(MODULES_VADDR, MODULES_END),
 689 #endif
 690
 691                         MLK_ROUNDUP(_text, _etext),
 692                         MLK_ROUNDUP(__init_begin, __init_end),
 693                         MLK_ROUNDUP(_sdata, _edata),
 694                         MLK_ROUNDUP(__bss_start, __bss_stop));
 695
 696 #undef MLK
 697 #undef MLM
 698 #undef MLK_ROUNDUP
 699
 700         /*
 701          * Check boundaries twice: Some fundamental inconsistencies can
 702          * be detected at build time already.
 703          */
 704 #ifdef CONFIG_MMU
 705         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 706         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 707 #endif
 708
 709 #ifdef CONFIG_HIGHMEM
 710         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 711         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 712 #endif
 713
 714         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 715                 extern int sysctl_overcommit_memory;
 716                 /*
 717                  * On a machine this small we won't get
 718                  * anywhere without overcommit, so turn
 719                  * it on by default.
 720                  */
 721                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 722         }
 723 }
 724
 725 void free_initmem(void)
 726 {
 727 #ifdef CONFIG_HAVE_TCM
 728         extern char __tcm_start, __tcm_end;
 729
 730         poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
 731         free_reserved_area(&__tcm_start, &__tcm_end, 0, "TCM link");
 732 #endif
 733
 734         poison_init_mem(__init_begin, __init_end - __init_begin);
 735         if (!machine_is_integrator() && !machine_is_cintegrator())
 736                 free_initmem_default(0);
 737 }
 738
 739 #ifdef CONFIG_BLK_DEV_INITRD
 740
 741 static int keep_initrd;
 742
 743 void free_initrd_mem(unsigned long start, unsigned long end)
 744 {
 745         if (!keep_initrd) {
 746                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
 747                 free_reserved_area(start, end, 0, "initrd");
 748         }
 749 }
 750
 751 static int __init keepinitrd_setup(char *__unused)
 752 {
 753         keep_initrd = 1;
 754         return 1;
 755 }
 756
 757 __setup("keepinitrd", keepinitrd_setup);
 758 #endif