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
  24 #include <asm/mach-types.h>
  25 #include <asm/memblock.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 #include <asm/memblock.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         for_each_bank (i, mi) {
 103                 struct membank *bank = &mi->bank[i];
 104                 unsigned int pfn1, pfn2;
 105                 struct page *page, *end;
 106
 107                 pfn1 = bank_pfn_start(bank);
 108                 pfn2 = bank_pfn_end(bank);
 109
 110                 page = pfn_to_page(pfn1);
 111                 end  = pfn_to_page(pfn2 - 1) + 1;
 112
 113                 do {
 114                         total++;
 115                         if (PageReserved(page))
 116                                 reserved++;
 117                         else if (PageSwapCache(page))
 118                                 cached++;
 119                         else if (PageSlab(page))
 120                                 slab++;
 121                         else if (!page_count(page))
 122                                 free++;
 123                         else
 124                                 shared += page_count(page) - 1;
 125                         page++;
 126                 } while (page < end);
 127         }
 128
 129         printk("%d pages of RAM\n", total);
 130         printk("%d free pages\n", free);
 131         printk("%d reserved pages\n", reserved);
 132         printk("%d slab pages\n", slab);
 133         printk("%d pages shared\n", shared);
 134         printk("%d pages swap cached\n", cached);
 135 }
 136
 137 static void __init find_limits(unsigned long *min, unsigned long *max_low,
 138                                unsigned long *max_high)
 139 {
 140         struct meminfo *mi = &meminfo;
 141         int i;
 142
 143         /* This assumes the meminfo array is properly sorted */
 144         *min = bank_pfn_start(&mi->bank[0]);
 145         for_each_bank (i, mi)
 146                 if (mi->bank[i].highmem)
 147                                 break;
 148         *max_low = bank_pfn_end(&mi->bank[i - 1]);
 149         *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
 150 }
 151
 152 static void __init arm_bootmem_init(unsigned long start_pfn,
 153         unsigned long end_pfn)
 154 {
 155         struct memblock_region *reg;
 156         unsigned int boot_pages;
 157         phys_addr_t bitmap;
 158         pg_data_t *pgdat;
 159
 160         /*
 161          * Allocate the bootmem bitmap page.  This must be in a region
 162          * of memory which has already been mapped.
 163          */
 164         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 165         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
 166                                 __pfn_to_phys(end_pfn));
 167
 168         /*
 169          * Initialise the bootmem allocator, handing the
 170          * memory banks over to bootmem.
 171          */
 172         node_set_online(0);
 173         pgdat = NODE_DATA(0);
 174         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 175
 176         /* Free the lowmem regions from memblock into bootmem. */
 177         for_each_memblock(memory, reg) {
 178                 unsigned long start = memblock_region_memory_base_pfn(reg);
 179                 unsigned long end = memblock_region_memory_end_pfn(reg);
 180
 181                 if (end >= end_pfn)
 182                         end = end_pfn;
 183                 if (start >= end)
 184                         break;
 185
 186                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
 187         }
 188
 189         /* Reserve the lowmem memblock reserved regions in bootmem. */
 190         for_each_memblock(reserved, reg) {
 191                 unsigned long start = memblock_region_reserved_base_pfn(reg);
 192                 unsigned long end = memblock_region_reserved_end_pfn(reg);
 193
 194                 if (end >= end_pfn)
 195                         end = end_pfn;
 196                 if (start >= end)
 197                         break;
 198
 199                 reserve_bootmem(__pfn_to_phys(start),
 200                                 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
 201         }
 202 }
 203
 204 #ifdef CONFIG_ZONE_DMA
 205
 206 unsigned long arm_dma_zone_size __read_mostly;
 207 EXPORT_SYMBOL(arm_dma_zone_size);
 208
 209 /*
 210  * The DMA mask corresponding to the maximum bus address allocatable
 211  * using GFP_DMA.  The default here places no restriction on DMA
 212  * allocations.  This must be the smallest DMA mask in the system,
 213  * so a successful GFP_DMA allocation will always satisfy this.
 214  */
 215 u32 arm_dma_limit;
 216
 217 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
 218         unsigned long dma_size)
 219 {
 220         if (size[0] <= dma_size)
 221                 return;
 222
 223         size[ZONE_NORMAL] = size[0] - dma_size;
 224         size[ZONE_DMA] = dma_size;
 225         hole[ZONE_NORMAL] = hole[0];
 226         hole[ZONE_DMA] = 0;
 227 }
 228 #endif
 229
 230 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
 231         unsigned long max_high)
 232 {
 233         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 234         struct memblock_region *reg;
 235
 236         /*
 237          * initialise the zones.
 238          */
 239         memset(zone_size, 0, sizeof(zone_size));
 240
 241         /*
 242          * The memory size has already been determined.  If we need
 243          * to do anything fancy with the allocation of this memory
 244          * to the zones, now is the time to do it.
 245          */
 246         zone_size[0] = max_low - min;
 247 #ifdef CONFIG_HIGHMEM
 248         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 249 #endif
 250
 251         /*
 252          * Calculate the size of the holes.
 253          *  holes = node_size - sum(bank_sizes)
 254          */
 255         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 256         for_each_memblock(memory, reg) {
 257                 unsigned long start = memblock_region_memory_base_pfn(reg);
 258                 unsigned long end = memblock_region_memory_end_pfn(reg);
 259
 260                 if (start < max_low) {
 261                         unsigned long low_end = min(end, max_low);
 262                         zhole_size[0] -= low_end - start;
 263                 }
 264 #ifdef CONFIG_HIGHMEM
 265                 if (end > max_low) {
 266                         unsigned long high_start = max(start, max_low);
 267                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
 268                 }
 269 #endif
 270         }
 271
 272 #ifdef CONFIG_ZONE_DMA
 273         /*
 274          * Adjust the sizes according to any special requirements for
 275          * this machine type.
 276          */
 277         if (arm_dma_zone_size) {
 278                 arm_adjust_dma_zone(zone_size, zhole_size,
 279                         arm_dma_zone_size >> PAGE_SHIFT);
 280                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
 281         } else
 282                 arm_dma_limit = 0xffffffff;
 283 #endif
 284
 285         free_area_init_node(0, zone_size, min, zhole_size);
 286 }
 287
 288 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 289 int pfn_valid(unsigned long pfn)
 290 {
 291         return memblock_is_memory(__pfn_to_phys(pfn));
 292 }
 293 EXPORT_SYMBOL(pfn_valid);
 294 #endif
 295
 296 #ifndef CONFIG_SPARSEMEM
 297 static void arm_memory_present(void)
 298 {
 299 }
 300 #else
 301 static void arm_memory_present(void)
 302 {
 303         struct memblock_region *reg;
 304
 305         for_each_memblock(memory, reg)
 306                 memory_present(0, memblock_region_memory_base_pfn(reg),
 307                                memblock_region_memory_end_pfn(reg));
 308 }
 309 #endif
 310
 311 static bool arm_memblock_steal_permitted = true;
 312
 313 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
 314 {
 315         phys_addr_t phys;
 316
 317         BUG_ON(!arm_memblock_steal_permitted);
 318
 319         phys = memblock_alloc(size, align);
 320         memblock_free(phys, size);
 321         memblock_remove(phys, size);
 322
 323         return phys;
 324 }
 325
 326 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 327 {
 328         int i;
 329
 330         for (i = 0; i < mi->nr_banks; i++)
 331                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 332
 333         /* Register the kernel text, kernel data and initrd with memblock. */
 334 #ifdef CONFIG_XIP_KERNEL
 335         memblock_reserve(__pa(_sdata), _end - _sdata);
 336 #else
 337         memblock_reserve(__pa(_stext), _end - _stext);
 338 #endif
 339 #ifdef CONFIG_BLK_DEV_INITRD
 340         if (phys_initrd_size &&
 341             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
 342                 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
 343                        phys_initrd_start, phys_initrd_size);
 344                 phys_initrd_start = phys_initrd_size = 0;
 345         }
 346         if (phys_initrd_size &&
 347             memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
 348                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
 349                        phys_initrd_start, phys_initrd_size);
 350                 phys_initrd_start = phys_initrd_size = 0;
 351         }
 352         if (phys_initrd_size) {
 353                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 354
 355                 /* Now convert initrd to virtual addresses */
 356                 initrd_start = __phys_to_virt(phys_initrd_start);
 357                 initrd_end = initrd_start + phys_initrd_size;
 358         }
 359 #endif
 360
 361         arm_mm_memblock_reserve();
 362         arm_dt_memblock_reserve();
 363
 364         /* reserve any platform specific memblock areas */
 365         if (mdesc->reserve)
 366                 mdesc->reserve();
 367
 368         arm_memblock_steal_permitted = false;
 369         memblock_allow_resize();
 370         memblock_dump_all();
 371 }
 372
 373 void __init bootmem_init(void)
 374 {
 375         unsigned long min, max_low, max_high;
 376
 377         max_low = max_high = 0;
 378
 379         find_limits(&min, &max_low, &max_high);
 380
 381         arm_bootmem_init(min, max_low);
 382
 383         /*
 384          * Sparsemem tries to allocate bootmem in memory_present(),
 385          * so must be done after the fixed reservations
 386          */
 387         arm_memory_present();
 388
 389         /*
 390          * sparse_init() needs the bootmem allocator up and running.
 391          */
 392         sparse_init();
 393
 394         /*
 395          * Now free the memory - free_area_init_node needs
 396          * the sparse mem_map arrays initialized by sparse_init()
 397          * for memmap_init_zone(), otherwise all PFNs are invalid.
 398          */
 399         arm_bootmem_free(min, max_low, max_high);
 400
 401         /*
 402          * This doesn't seem to be used by the Linux memory manager any
 403          * more, but is used by ll_rw_block.  If we can get rid of it, we
 404          * also get rid of some of the stuff above as well.
 405          *
 406          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 407          * the system, not the maximum PFN.
 408          */
 409         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 410         max_pfn = max_high - PHYS_PFN_OFFSET;
 411 }
 412
 413 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 414 {
 415         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 416
 417         for (; pfn < end; pfn++) {
 418                 struct page *page = pfn_to_page(pfn);
 419                 ClearPageReserved(page);
 420                 init_page_count(page);
 421                 __free_page(page);
 422                 pages++;
 423         }
 424
 425         if (size && s)
 426                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 427
 428         return pages;
 429 }
 430
 431 /*
 432  * Poison init memory with an undefined instruction (ARM) or a branch to an
 433  * undefined instruction (Thumb).
 434  */
 435 static inline void poison_init_mem(void *s, size_t count)
 436 {
 437         u32 *p = (u32 *)s;
 438         for (; count != 0; count -= 4)
 439                 *p++ = 0xe7fddef0;
 440 }
 441
 442 static inline void
 443 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 444 {
 445         struct page *start_pg, *end_pg;
 446         unsigned long pg, pgend;
 447
 448         /*
 449          * Convert start_pfn/end_pfn to a struct page pointer.
 450          */
 451         start_pg = pfn_to_page(start_pfn - 1) + 1;
 452         end_pg = pfn_to_page(end_pfn - 1) + 1;
 453
 454         /*
 455          * Convert to physical addresses, and
 456          * round start upwards and end downwards.
 457          */
 458         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
 459         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
 460
 461         /*
 462          * If there are free pages between these,
 463          * free the section of the memmap array.
 464          */
 465         if (pg < pgend)
 466                 free_bootmem(pg, pgend - pg);
 467 }
 468
 469 /*
 470  * The mem_map array can get very big.  Free the unused area of the memory map.
 471  */
 472 static void __init free_unused_memmap(struct meminfo *mi)
 473 {
 474         unsigned long bank_start, prev_bank_end = 0;
 475         unsigned int i;
 476
 477         /*
 478          * This relies on each bank being in address order.
 479          * The banks are sorted previously in bootmem_init().
 480          */
 481         for_each_bank(i, mi) {
 482                 struct membank *bank = &mi->bank[i];
 483
 484                 bank_start = bank_pfn_start(bank);
 485
 486 #ifdef CONFIG_SPARSEMEM
 487                 /*
 488                  * Take care not to free memmap entries that don't exist
 489                  * due to SPARSEMEM sections which aren't present.
 490                  */
 491                 bank_start = min(bank_start,
 492                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
 493 #else
 494                 /*
 495                  * Align down here since the VM subsystem insists that the
 496                  * memmap entries are valid from the bank start aligned to
 497                  * MAX_ORDER_NR_PAGES.
 498                  */
 499                 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
 500 #endif
 501                 /*
 502                  * If we had a previous bank, and there is a space
 503                  * between the current bank and the previous, free it.
 504                  */
 505                 if (prev_bank_end && prev_bank_end < bank_start)
 506                         free_memmap(prev_bank_end, bank_start);
 507
 508                 /*
 509                  * Align up here since the VM subsystem insists that the
 510                  * memmap entries are valid from the bank end aligned to
 511                  * MAX_ORDER_NR_PAGES.
 512                  */
 513                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 514         }
 515
 516 #ifdef CONFIG_SPARSEMEM
 517         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
 518                 free_memmap(prev_bank_end,
 519                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
 520 #endif
 521 }
 522
 523 static void __init free_highpages(void)
 524 {
 525 #ifdef CONFIG_HIGHMEM
 526         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
 527         struct memblock_region *mem, *res;
 528
 529         /* set highmem page free */
 530         for_each_memblock(memory, mem) {
 531                 unsigned long start = memblock_region_memory_base_pfn(mem);
 532                 unsigned long end = memblock_region_memory_end_pfn(mem);
 533
 534                 /* Ignore complete lowmem entries */
 535                 if (end <= max_low)
 536                         continue;
 537
 538                 /* Truncate partial highmem entries */
 539                 if (start < max_low)
 540                         start = max_low;
 541
 542                 /* Find and exclude any reserved regions */
 543                 for_each_memblock(reserved, res) {
 544                         unsigned long res_start, res_end;
 545
 546                         res_start = memblock_region_reserved_base_pfn(res);
 547                         res_end = memblock_region_reserved_end_pfn(res);
 548
 549                         if (res_end < start)
 550                                 continue;
 551                         if (res_start < start)
 552                                 res_start = start;
 553                         if (res_start > end)
 554                                 res_start = end;
 555                         if (res_end > end)
 556                                 res_end = end;
 557                         if (res_start != start)
 558                                 totalhigh_pages += free_area(start, res_start,
 559                                                              NULL);
 560                         start = res_end;
 561                         if (start == end)
 562                                 break;
 563                 }
 564
 565                 /* And now free anything which remains */
 566                 if (start < end)
 567                         totalhigh_pages += free_area(start, end, NULL);
 568         }
 569         totalram_pages += totalhigh_pages;
 570 #endif
 571 }
 572
 573 /*
 574  * mem_init() marks the free areas in the mem_map and tells us how much
 575  * memory is free.  This is done after various parts of the system have
 576  * claimed their memory after the kernel image.
 577  */
 578 void __init mem_init(void)
 579 {
 580         unsigned long reserved_pages, free_pages;
 581         struct memblock_region *reg;
 582         int i;
 583 #ifdef CONFIG_HAVE_TCM
 584         /* These pointers are filled in on TCM detection */
 585         extern u32 dtcm_end;
 586         extern u32 itcm_end;
 587 #endif
 588
 589         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 590
 591         /* this will put all unused low memory onto the freelists */
 592         free_unused_memmap(&meminfo);
 593
 594         totalram_pages += free_all_bootmem();
 595
 596 #ifdef CONFIG_SA1111
 597         /* now that our DMA memory is actually so designated, we can free it */
 598         totalram_pages += free_area(PHYS_PFN_OFFSET,
 599                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 600 #endif
 601
 602         free_highpages();
 603
 604         reserved_pages = free_pages = 0;
 605
 606         for_each_bank(i, &meminfo) {
 607                 struct membank *bank = &meminfo.bank[i];
 608                 unsigned int pfn1, pfn2;
 609                 struct page *page, *end;
 610
 611                 pfn1 = bank_pfn_start(bank);
 612                 pfn2 = bank_pfn_end(bank);
 613
 614                 page = pfn_to_page(pfn1);
 615                 end  = pfn_to_page(pfn2 - 1) + 1;
 616
 617                 do {
 618                         if (PageReserved(page))
 619                                 reserved_pages++;
 620                         else if (!page_count(page))
 621                                 free_pages++;
 622                         page++;
 623                 } while (page < end);
 624         }
 625
 626         /*
 627          * Since our memory may not be contiguous, calculate the
 628          * real number of pages we have in this system
 629          */
 630         printk(KERN_INFO "Memory:");
 631         num_physpages = 0;
 632         for_each_memblock(memory, reg) {
 633                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 634                         memblock_region_memory_base_pfn(reg);
 635                 num_physpages += pages;
 636                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 637         }
 638         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 639
 640         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 641                 nr_free_pages() << (PAGE_SHIFT-10),
 642                 free_pages << (PAGE_SHIFT-10),
 643                 reserved_pages << (PAGE_SHIFT-10),
 644                 totalhigh_pages << (PAGE_SHIFT-10));
 645
 646 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 647 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 648 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 649
 650         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 651                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 652 #ifdef CONFIG_HAVE_TCM
 653                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 654                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 655 #endif
 656                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 657                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 658                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 659 #ifdef CONFIG_HIGHMEM
 660                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 661 #endif
 662                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 663                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 664                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 665                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
 666                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
 667
 668                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 669                                 (PAGE_SIZE)),
 670 #ifdef CONFIG_HAVE_TCM
 671                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 672                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 673 #endif
 674                         MLK(FIXADDR_START, FIXADDR_TOP),
 675                         MLM(VMALLOC_START, VMALLOC_END),
 676                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 677 #ifdef CONFIG_HIGHMEM
 678                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 679                                 (PAGE_SIZE)),
 680 #endif
 681                         MLM(MODULES_VADDR, MODULES_END),
 682
 683                         MLK_ROUNDUP(_text, _etext),
 684                         MLK_ROUNDUP(__init_begin, __init_end),
 685                         MLK_ROUNDUP(_sdata, _edata),
 686                         MLK_ROUNDUP(__bss_start, __bss_stop));
 687
 688 #undef MLK
 689 #undef MLM
 690 #undef MLK_ROUNDUP
 691
 692         /*
 693          * Check boundaries twice: Some fundamental inconsistencies can
 694          * be detected at build time already.
 695          */
 696 #ifdef CONFIG_MMU
 697         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 698         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 699 #endif
 700
 701 #ifdef CONFIG_HIGHMEM
 702         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 703         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 704 #endif
 705
 706         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 707                 extern int sysctl_overcommit_memory;
 708                 /*
 709                  * On a machine this small we won't get
 710                  * anywhere without overcommit, so turn
 711                  * it on by default.
 712                  */
 713                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 714         }
 715 }
 716
 717 void free_initmem(void)
 718 {
 719 #ifdef CONFIG_HAVE_TCM
 720         extern char __tcm_start, __tcm_end;
 721
 722         poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
 723         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 724                                     __phys_to_pfn(__pa(&__tcm_end)),
 725                                     "TCM link");
 726 #endif
 727
 728         poison_init_mem(__init_begin, __init_end - __init_begin);
 729         if (!machine_is_integrator() && !machine_is_cintegrator())
 730                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 731                                             __phys_to_pfn(__pa(__init_end)),
 732                                             "init");
 733 }
 734
 735 #ifdef CONFIG_BLK_DEV_INITRD
 736
 737 static int keep_initrd;
 738
 739 void free_initrd_mem(unsigned long start, unsigned long end)
 740 {
 741         if (!keep_initrd) {
 742                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
 743                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 744                                             __phys_to_pfn(__pa(end)),
 745                                             "initrd");
 746         }
 747 }
 748
 749 static int __init keepinitrd_setup(char *__unused)
 750 {
 751         keep_initrd = 1;
 752         return 1;
 753 }
 754
 755 __setup("keepinitrd", keepinitrd_setup);
 756 #endif