arch/arm/mm/init.c

   1 /*
   2  *  linux/arch/arm/mm/init.c
   3  *
   4  *  Copyright (C) 1995-2005 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/errno.h>
  12 #include <linux/swap.h>
  13 #include <linux/init.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/mman.h>
  16 #include <linux/nodemask.h>
  17 #include <linux/initrd.h>
  18 #include <linux/of_fdt.h>
  19 #include <linux/highmem.h>
  20 #include <linux/gfp.h>
  21 #include <linux/memblock.h>
  22 #include <linux/sort.h>
  23
  24 #include <asm/mach-types.h>
  25 #include <asm/prom.h>
  26 #include <asm/sections.h>
  27 #include <asm/setup.h>
  28 #include <asm/sizes.h>
  29 #include <asm/tlb.h>
  30 #include <asm/fixmap.h>
  31
  32 #include <asm/mach/arch.h>
  33 #include <asm/mach/map.h>
  34
  35 #include "mm.h"
  36
  37 static unsigned long phys_initrd_start __initdata = 0;
  38 static unsigned long phys_initrd_size __initdata = 0;
  39
  40 static int __init early_initrd(char *p)
  41 {
  42         unsigned long start, size;
  43         char *endp;
  44
  45         start = memparse(p, &endp);
  46         if (*endp == ',') {
  47                 size = memparse(endp + 1, NULL);
  48
  49                 phys_initrd_start = start;
  50                 phys_initrd_size = size;
  51         }
  52         return 0;
  53 }
  54 early_param("initrd", early_initrd);
  55
  56 static int __init parse_tag_initrd(const struct tag *tag)
  57 {
  58         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
  59                 "please update your bootloader.\n");
  60         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  61         phys_initrd_size = tag->u.initrd.size;
  62         return 0;
  63 }
  64
  65 __tagtable(ATAG_INITRD, parse_tag_initrd);
  66
  67 static int __init parse_tag_initrd2(const struct tag *tag)
  68 {
  69         phys_initrd_start = tag->u.initrd.start;
  70         phys_initrd_size = tag->u.initrd.size;
  71         return 0;
  72 }
  73
  74 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  75
  76 #ifdef CONFIG_OF_FLATTREE
  77 void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
  78 {
  79         phys_initrd_start = start;
  80         phys_initrd_size = end - start;
  81 }
  82 #endif /* CONFIG_OF_FLATTREE */
  83
  84 /*
  85  * This keeps memory configuration data used by a couple memory
  86  * initialization functions, as well as show_mem() for the skipping
  87  * of holes in the memory map.  It is populated by arm_add_memory().
  88  */
  89 struct meminfo meminfo;
  90
  91 void show_mem(unsigned int filter)
  92 {
  93         int free = 0, total = 0, reserved = 0;
  94         int shared = 0, cached = 0, slab = 0, i;
  95         struct meminfo * mi = &meminfo;
  96
  97         printk("Mem-info:\n");
  98         show_free_areas(filter);
  99
 100         for_each_bank (i, mi) {
 101                 struct membank *bank = &mi->bank[i];
 102                 unsigned int pfn1, pfn2;
 103                 struct page *page, *end;
 104
 105                 pfn1 = bank_pfn_start(bank);
 106                 pfn2 = bank_pfn_end(bank);
 107
 108                 page = pfn_to_page(pfn1);
 109                 end  = pfn_to_page(pfn2 - 1) + 1;
 110
 111                 do {
 112                         total++;
 113                         if (PageReserved(page))
 114                                 reserved++;
 115                         else if (PageSwapCache(page))
 116                                 cached++;
 117                         else if (PageSlab(page))
 118                                 slab++;
 119                         else if (!page_count(page))
 120                                 free++;
 121                         else
 122                                 shared += page_count(page) - 1;
 123                         page++;
 124                 } while (page < end);
 125         }
 126
 127         printk("%d pages of RAM\n", total);
 128         printk("%d free pages\n", free);
 129         printk("%d reserved pages\n", reserved);
 130         printk("%d slab pages\n", slab);
 131         printk("%d pages shared\n", shared);
 132         printk("%d pages swap cached\n", cached);
 133 }
 134
 135 static void __init find_limits(unsigned long *min, unsigned long *max_low,
 136         unsigned long *max_high)
 137 {
 138         struct meminfo *mi = &meminfo;
 139         int i;
 140
 141         *min = -1UL;
 142         *max_low = *max_high = 0;
 143
 144         for_each_bank (i, mi) {
 145                 struct membank *bank = &mi->bank[i];
 146                 unsigned long start, end;
 147
 148                 start = bank_pfn_start(bank);
 149                 end = bank_pfn_end(bank);
 150
 151                 if (*min > start)
 152                         *min = start;
 153                 if (*max_high < end)
 154                         *max_high = end;
 155                 if (bank->highmem)
 156                         continue;
 157                 if (*max_low < end)
 158                         *max_low = end;
 159         }
 160 }
 161
 162 static void __init arm_bootmem_init(unsigned long start_pfn,
 163         unsigned long end_pfn)
 164 {
 165         struct memblock_region *reg;
 166         unsigned int boot_pages;
 167         phys_addr_t bitmap;
 168         pg_data_t *pgdat;
 169
 170         /*
 171          * Allocate the bootmem bitmap page.  This must be in a region
 172          * of memory which has already been mapped.
 173          */
 174         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 175         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
 176                                 __pfn_to_phys(end_pfn));
 177
 178         /*
 179          * Initialise the bootmem allocator, handing the
 180          * memory banks over to bootmem.
 181          */
 182         node_set_online(0);
 183         pgdat = NODE_DATA(0);
 184         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 185
 186         /* Free the lowmem regions from memblock into bootmem. */
 187         for_each_memblock(memory, reg) {
 188                 unsigned long start = memblock_region_memory_base_pfn(reg);
 189                 unsigned long end = memblock_region_memory_end_pfn(reg);
 190
 191                 if (end >= end_pfn)
 192                         end = end_pfn;
 193                 if (start >= end)
 194                         break;
 195
 196                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
 197         }
 198
 199         /* Reserve the lowmem memblock reserved regions in bootmem. */
 200         for_each_memblock(reserved, reg) {
 201                 unsigned long start = memblock_region_reserved_base_pfn(reg);
 202                 unsigned long end = memblock_region_reserved_end_pfn(reg);
 203
 204                 if (end >= end_pfn)
 205                         end = end_pfn;
 206                 if (start >= end)
 207                         break;
 208
 209                 reserve_bootmem(__pfn_to_phys(start),
 210                                 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
 211         }
 212 }
 213
 214 #ifdef CONFIG_ZONE_DMA
 215
 216 unsigned long arm_dma_zone_size __read_mostly;
 217 EXPORT_SYMBOL(arm_dma_zone_size);
 218
 219 /*
 220  * The DMA mask corresponding to the maximum bus address allocatable
 221  * using GFP_DMA.  The default here places no restriction on DMA
 222  * allocations.  This must be the smallest DMA mask in the system,
 223  * so a successful GFP_DMA allocation will always satisfy this.
 224  */
 225 u32 arm_dma_limit;
 226
 227 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
 228         unsigned long dma_size)
 229 {
 230         if (size[0] <= dma_size)
 231                 return;
 232
 233         size[ZONE_NORMAL] = size[0] - dma_size;
 234         size[ZONE_DMA] = dma_size;
 235         hole[ZONE_NORMAL] = hole[0];
 236         hole[ZONE_DMA] = 0;
 237 }
 238 #endif
 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                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
 291         } else
 292                 arm_dma_limit = 0xffffffff;
 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 static int __init meminfo_cmp(const void *_a, const void *_b)
 322 {
 323         const struct membank *a = _a, *b = _b;
 324         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
 325         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
 326 }
 327
 328 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 329 {
 330         int i;
 331
 332         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
 333
 334         memblock_init();
 335         for (i = 0; i < mi->nr_banks; i++)
 336                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 337
 338         /* Register the kernel text, kernel data and initrd with memblock. */
 339 #ifdef CONFIG_XIP_KERNEL
 340         memblock_reserve(__pa(_sdata), _end - _sdata);
 341 #else
 342         memblock_reserve(__pa(_stext), _end - _stext);
 343 #endif
 344 #ifdef CONFIG_BLK_DEV_INITRD
 345         if (phys_initrd_size &&
 346             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
 347                 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
 348                        phys_initrd_start, phys_initrd_size);
 349                 phys_initrd_start = phys_initrd_size = 0;
 350         }
 351         if (phys_initrd_size &&
 352             memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
 353                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use 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_reserve(phys_initrd_start, phys_initrd_size);
 359
 360                 /* Now convert initrd to virtual addresses */
 361                 initrd_start = __phys_to_virt(phys_initrd_start);
 362                 initrd_end = initrd_start + phys_initrd_size;
 363         }
 364 #endif
 365
 366         arm_mm_memblock_reserve();
 367         arm_dt_memblock_reserve();
 368
 369         /* reserve any platform specific memblock areas */
 370         if (mdesc->reserve)
 371                 mdesc->reserve();
 372
 373         memblock_analyze();
 374         memblock_dump_all();
 375 }
 376
 377 void __init bootmem_init(void)
 378 {
 379         unsigned long min, max_low, max_high;
 380
 381         max_low = max_high = 0;
 382
 383         find_limits(&min, &max_low, &max_high);
 384
 385         arm_bootmem_init(min, max_low);
 386
 387         /*
 388          * Sparsemem tries to allocate bootmem in memory_present(),
 389          * so must be done after the fixed reservations
 390          */
 391         arm_memory_present();
 392
 393         /*
 394          * sparse_init() needs the bootmem allocator up and running.
 395          */
 396         sparse_init();
 397
 398         /*
 399          * Now free the memory - free_area_init_node needs
 400          * the sparse mem_map arrays initialized by sparse_init()
 401          * for memmap_init_zone(), otherwise all PFNs are invalid.
 402          */
 403         arm_bootmem_free(min, max_low, max_high);
 404
 405         high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1;
 406
 407         /*
 408          * This doesn't seem to be used by the Linux memory manager any
 409          * more, but is used by ll_rw_block.  If we can get rid of it, we
 410          * also get rid of some of the stuff above as well.
 411          *
 412          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 413          * the system, not the maximum PFN.
 414          */
 415         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 416         max_pfn = max_high - PHYS_PFN_OFFSET;
 417 }
 418
 419 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 420 {
 421         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 422
 423         for (; pfn < end; pfn++) {
 424                 struct page *page = pfn_to_page(pfn);
 425                 ClearPageReserved(page);
 426                 init_page_count(page);
 427                 __free_page(page);
 428                 pages++;
 429         }
 430
 431         if (size && s)
 432                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 433
 434         return pages;
 435 }
 436
 437 /*
 438  * Poison init memory with an undefined instruction (ARM) or a branch to an
 439  * undefined instruction (Thumb).
 440  */
 441 static inline void poison_init_mem(void *s, size_t count)
 442 {
 443         u32 *p = (u32 *)s;
 444         for (; count != 0; count -= 4)
 445                 *p++ = 0xe7fddef0;
 446 }
 447
 448 static inline void
 449 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 450 {
 451         struct page *start_pg, *end_pg;
 452         unsigned long pg, pgend;
 453
 454         /*
 455          * Convert start_pfn/end_pfn to a struct page pointer.
 456          */
 457         start_pg = pfn_to_page(start_pfn - 1) + 1;
 458         end_pg = pfn_to_page(end_pfn - 1) + 1;
 459
 460         /*
 461          * Convert to physical addresses, and
 462          * round start upwards and end downwards.
 463          */
 464         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
 465         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
 466
 467         /*
 468          * If there are free pages between these,
 469          * free the section of the memmap array.
 470          */
 471         if (pg < pgend)
 472                 free_bootmem(pg, pgend - pg);
 473 }
 474
 475 /*
 476  * The mem_map array can get very big.  Free the unused area of the memory map.
 477  */
 478 static void __init free_unused_memmap(struct meminfo *mi)
 479 {
 480         unsigned long bank_start, prev_bank_end = 0;
 481         unsigned int i;
 482
 483         /*
 484          * This relies on each bank being in address order.
 485          * The banks are sorted previously in bootmem_init().
 486          */
 487         for_each_bank(i, mi) {
 488                 struct membank *bank = &mi->bank[i];
 489
 490                 bank_start = bank_pfn_start(bank);
 491
 492 #ifdef CONFIG_SPARSEMEM
 493                 /*
 494                  * Take care not to free memmap entries that don't exist
 495                  * due to SPARSEMEM sections which aren't present.
 496                  */
 497                 bank_start = min(bank_start,
 498                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
 499 #else
 500                 /*
 501                  * Align down here since the VM subsystem insists that the
 502                  * memmap entries are valid from the bank start aligned to
 503                  * MAX_ORDER_NR_PAGES.
 504                  */
 505                 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
 506 #endif
 507                 /*
 508                  * If we had a previous bank, and there is a space
 509                  * between the current bank and the previous, free it.
 510                  */
 511                 if (prev_bank_end && prev_bank_end < bank_start)
 512                         free_memmap(prev_bank_end, bank_start);
 513
 514                 /*
 515                  * Align up here since the VM subsystem insists that the
 516                  * memmap entries are valid from the bank end aligned to
 517                  * MAX_ORDER_NR_PAGES.
 518                  */
 519                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 520         }
 521
 522 #ifdef CONFIG_SPARSEMEM
 523         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
 524                 free_memmap(prev_bank_end,
 525                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
 526 #endif
 527 }
 528
 529 static void __init free_highpages(void)
 530 {
 531 #ifdef CONFIG_HIGHMEM
 532         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
 533         struct memblock_region *mem, *res;
 534
 535         /* set highmem page free */
 536         for_each_memblock(memory, mem) {
 537                 unsigned long start = memblock_region_memory_base_pfn(mem);
 538                 unsigned long end = memblock_region_memory_end_pfn(mem);
 539
 540                 /* Ignore complete lowmem entries */
 541                 if (end <= max_low)
 542                         continue;
 543
 544                 /* Truncate partial highmem entries */
 545                 if (start < max_low)
 546                         start = max_low;
 547
 548                 /* Find and exclude any reserved regions */
 549                 for_each_memblock(reserved, res) {
 550                         unsigned long res_start, res_end;
 551
 552                         res_start = memblock_region_reserved_base_pfn(res);
 553                         res_end = memblock_region_reserved_end_pfn(res);
 554
 555                         if (res_end < start)
 556                                 continue;
 557                         if (res_start < start)
 558                                 res_start = start;
 559                         if (res_start > end)
 560                                 res_start = end;
 561                         if (res_end > end)
 562                                 res_end = end;
 563                         if (res_start != start)
 564                                 totalhigh_pages += free_area(start, res_start,
 565                                                              NULL);
 566                         start = res_end;
 567                         if (start == end)
 568                                 break;
 569                 }
 570
 571                 /* And now free anything which remains */
 572                 if (start < end)
 573                         totalhigh_pages += free_area(start, end, NULL);
 574         }
 575         totalram_pages += totalhigh_pages;
 576 #endif
 577 }
 578
 579 /*
 580  * mem_init() marks the free areas in the mem_map and tells us how much
 581  * memory is free.  This is done after various parts of the system have
 582  * claimed their memory after the kernel image.
 583  */
 584 void __init mem_init(void)
 585 {
 586         unsigned long reserved_pages, free_pages;
 587         struct memblock_region *reg;
 588         int i;
 589 #ifdef CONFIG_HAVE_TCM
 590         /* These pointers are filled in on TCM detection */
 591         extern u32 dtcm_end;
 592         extern u32 itcm_end;
 593 #endif
 594
 595         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 596
 597         /* this will put all unused low memory onto the freelists */
 598         free_unused_memmap(&meminfo);
 599
 600         totalram_pages += free_all_bootmem();
 601
 602 #ifdef CONFIG_SA1111
 603         /* now that our DMA memory is actually so designated, we can free it */
 604         totalram_pages += free_area(PHYS_PFN_OFFSET,
 605                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 606 #endif
 607
 608         free_highpages();
 609
 610         reserved_pages = free_pages = 0;
 611
 612         for_each_bank(i, &meminfo) {
 613                 struct membank *bank = &meminfo.bank[i];
 614                 unsigned int pfn1, pfn2;
 615                 struct page *page, *end;
 616
 617                 pfn1 = bank_pfn_start(bank);
 618                 pfn2 = bank_pfn_end(bank);
 619
 620                 page = pfn_to_page(pfn1);
 621                 end  = pfn_to_page(pfn2 - 1) + 1;
 622
 623                 do {
 624                         if (PageReserved(page))
 625                                 reserved_pages++;
 626                         else if (!page_count(page))
 627                                 free_pages++;
 628                         page++;
 629                 } while (page < end);
 630         }
 631
 632         /*
 633          * Since our memory may not be contiguous, calculate the
 634          * real number of pages we have in this system
 635          */
 636         printk(KERN_INFO "Memory:");
 637         num_physpages = 0;
 638         for_each_memblock(memory, reg) {
 639                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 640                         memblock_region_memory_base_pfn(reg);
 641                 num_physpages += pages;
 642                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 643         }
 644         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 645
 646         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 647                 nr_free_pages() << (PAGE_SHIFT-10),
 648                 free_pages << (PAGE_SHIFT-10),
 649                 reserved_pages << (PAGE_SHIFT-10),
 650                 totalhigh_pages << (PAGE_SHIFT-10));
 651
 652 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 653 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 654 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 655
 656         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 657                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 658 #ifdef CONFIG_HAVE_TCM
 659                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 660                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 661 #endif
 662                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 663 #ifdef CONFIG_MMU
 664                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 665 #endif
 666                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 667                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 668 #ifdef CONFIG_HIGHMEM
 669                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 670 #endif
 671                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 672                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 673                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 674                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
 675                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
 676
 677                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 678                                 (PAGE_SIZE)),
 679 #ifdef CONFIG_HAVE_TCM
 680                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 681                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 682 #endif
 683                         MLK(FIXADDR_START, FIXADDR_TOP),
 684 #ifdef CONFIG_MMU
 685                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 686 #endif
 687                         MLM(VMALLOC_START, VMALLOC_END),
 688                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 689 #ifdef CONFIG_HIGHMEM
 690                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 691                                 (PAGE_SIZE)),
 692 #endif
 693                         MLM(MODULES_VADDR, MODULES_END),
 694
 695                         MLK_ROUNDUP(_text, _etext),
 696                         MLK_ROUNDUP(__init_begin, __init_end),
 697                         MLK_ROUNDUP(_sdata, _edata),
 698                         MLK_ROUNDUP(__bss_start, __bss_stop));
 699
 700 #undef MLK
 701 #undef MLM
 702 #undef MLK_ROUNDUP
 703
 704         /*
 705          * Check boundaries twice: Some fundamental inconsistencies can
 706          * be detected at build time already.
 707          */
 708 #ifdef CONFIG_MMU
 709         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 710         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 711
 712         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 713         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 714 #endif
 715
 716 #ifdef CONFIG_HIGHMEM
 717         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 718         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 719 #endif
 720
 721         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 722                 extern int sysctl_overcommit_memory;
 723                 /*
 724                  * On a machine this small we won't get
 725                  * anywhere without overcommit, so turn
 726                  * it on by default.
 727                  */
 728                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 729         }
 730 }
 731
 732 void free_initmem(void)
 733 {
 734 #ifdef CONFIG_HAVE_TCM
 735         extern char __tcm_start, __tcm_end;
 736
 737         poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
 738         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 739                                     __phys_to_pfn(__pa(&__tcm_end)),
 740                                     "TCM link");
 741 #endif
 742
 743         poison_init_mem(__init_begin, __init_end - __init_begin);
 744         if (!machine_is_integrator() && !machine_is_cintegrator())
 745                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 746                                             __phys_to_pfn(__pa(__init_end)),
 747                                             "init");
 748 }
 749
 750 #ifdef CONFIG_BLK_DEV_INITRD
 751
 752 static int keep_initrd;
 753
 754 void free_initrd_mem(unsigned long start, unsigned long end)
 755 {
 756         if (!keep_initrd) {
 757                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
 758                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 759                                             __phys_to_pfn(__pa(end)),
 760                                             "initrd");
 761         }
 762 }
 763
 764 static int __init keepinitrd_setup(char *__unused)
 765 {
 766         keep_initrd = 1;
 767         return 1;
 768 }
 769
 770 __setup("keepinitrd", keepinitrd_setup);
 771 #endif