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/sort.h>
  24
  25 #include <asm/mach-types.h>
  26 #include <asm/prom.h>
  27 #include <asm/sections.h>
  28 #include <asm/setup.h>
  29 #include <asm/sizes.h>
  30 #include <asm/tlb.h>
  31 #include <asm/fixmap.h>
  32
  33 #include <asm/mach/arch.h>
  34 #include <asm/mach/map.h>
  35
  36 #include "mm.h"
  37
  38 static unsigned long phys_initrd_start __initdata = 0;
  39 static unsigned long phys_initrd_size __initdata = 0;
  40
  41 static int __init early_initrd(char *p)
  42 {
  43         unsigned long start, size;
  44         char *endp;
  45
  46         start = memparse(p, &endp);
  47         if (*endp == ',') {
  48                 size = memparse(endp + 1, NULL);
  49
  50                 phys_initrd_start = start;
  51                 phys_initrd_size = size;
  52         }
  53         return 0;
  54 }
  55 early_param("initrd", early_initrd);
  56
  57 static int __init parse_tag_initrd(const struct tag *tag)
  58 {
  59         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
  60                 "please update your bootloader.\n");
  61         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  62         phys_initrd_size = tag->u.initrd.size;
  63         return 0;
  64 }
  65
  66 __tagtable(ATAG_INITRD, parse_tag_initrd);
  67
  68 static int __init parse_tag_initrd2(const struct tag *tag)
  69 {
  70         phys_initrd_start = tag->u.initrd.start;
  71         phys_initrd_size = tag->u.initrd.size;
  72         return 0;
  73 }
  74
  75 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  76
  77 #ifdef CONFIG_OF_FLATTREE
  78 void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
  79 {
  80         phys_initrd_start = start;
  81         phys_initrd_size = end - start;
  82 }
  83 #endif /* CONFIG_OF_FLATTREE */
  84
  85 /*
  86  * This keeps memory configuration data used by a couple memory
  87  * initialization functions, as well as show_mem() for the skipping
  88  * of holes in the memory map.  It is populated by arm_add_memory().
  89  */
  90 struct meminfo meminfo;
  91
  92 void show_mem(unsigned int filter)
  93 {
  94         int free = 0, total = 0, reserved = 0;
  95         int shared = 0, cached = 0, slab = 0, i;
  96         struct meminfo * mi = &meminfo;
  97
  98         printk("Mem-info:\n");
  99         show_free_areas(filter);
 100
 101         for_each_bank (i, mi) {
 102                 struct membank *bank = &mi->bank[i];
 103                 unsigned int pfn1, pfn2;
 104                 struct page *page, *end;
 105
 106                 pfn1 = bank_pfn_start(bank);
 107                 pfn2 = bank_pfn_end(bank);
 108
 109                 page = pfn_to_page(pfn1);
 110                 end  = pfn_to_page(pfn2 - 1) + 1;
 111
 112                 do {
 113                         total++;
 114                         if (PageReserved(page))
 115                                 reserved++;
 116                         else if (PageSwapCache(page))
 117                                 cached++;
 118                         else if (PageSlab(page))
 119                                 slab++;
 120                         else if (!page_count(page))
 121                                 free++;
 122                         else
 123                                 shared += page_count(page) - 1;
 124                         page++;
 125                 } while (page < end);
 126         }
 127
 128         printk("%d pages of RAM\n", total);
 129         printk("%d free pages\n", free);
 130         printk("%d reserved pages\n", reserved);
 131         printk("%d slab pages\n", slab);
 132         printk("%d pages shared\n", shared);
 133         printk("%d pages swap cached\n", cached);
 134 }
 135
 136 static void __init find_limits(unsigned long *min, unsigned long *max_low,
 137         unsigned long *max_high)
 138 {
 139         struct meminfo *mi = &meminfo;
 140         int i;
 141
 142         *min = -1UL;
 143         *max_low = *max_high = 0;
 144
 145         for_each_bank (i, mi) {
 146                 struct membank *bank = &mi->bank[i];
 147                 unsigned long start, end;
 148
 149                 start = bank_pfn_start(bank);
 150                 end = bank_pfn_end(bank);
 151
 152                 if (*min > start)
 153                         *min = start;
 154                 if (*max_high < end)
 155                         *max_high = end;
 156                 if (bank->highmem)
 157                         continue;
 158                 if (*max_low < end)
 159                         *max_low = end;
 160         }
 161 }
 162
 163 static void __init arm_bootmem_init(unsigned long start_pfn,
 164         unsigned long end_pfn)
 165 {
 166         struct memblock_region *reg;
 167         unsigned int boot_pages;
 168         phys_addr_t bitmap;
 169         pg_data_t *pgdat;
 170
 171         /*
 172          * Allocate the bootmem bitmap page.  This must be in a region
 173          * of memory which has already been mapped.
 174          */
 175         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 176         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
 177                                 __pfn_to_phys(end_pfn));
 178
 179         /*
 180          * Initialise the bootmem allocator, handing the
 181          * memory banks over to bootmem.
 182          */
 183         node_set_online(0);
 184         pgdat = NODE_DATA(0);
 185         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 186
 187         /* Free the lowmem regions from memblock into bootmem. */
 188         for_each_memblock(memory, reg) {
 189                 unsigned long start = memblock_region_memory_base_pfn(reg);
 190                 unsigned long end = memblock_region_memory_end_pfn(reg);
 191
 192                 if (end >= end_pfn)
 193                         end = end_pfn;
 194                 if (start >= end)
 195                         break;
 196
 197                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
 198         }
 199
 200         /* Reserve the lowmem memblock reserved regions in bootmem. */
 201         for_each_memblock(reserved, reg) {
 202                 unsigned long start = memblock_region_reserved_base_pfn(reg);
 203                 unsigned long end = memblock_region_reserved_end_pfn(reg);
 204
 205                 if (end >= end_pfn)
 206                         end = end_pfn;
 207                 if (start >= end)
 208                         break;
 209
 210                 reserve_bootmem(__pfn_to_phys(start),
 211                                 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
 212         }
 213 }
 214
 215 #ifdef CONFIG_ZONE_DMA
 216
 217 unsigned long arm_dma_zone_size __read_mostly;
 218 EXPORT_SYMBOL(arm_dma_zone_size);
 219
 220 /*
 221  * The DMA mask corresponding to the maximum bus address allocatable
 222  * using GFP_DMA.  The default here places no restriction on DMA
 223  * allocations.  This must be the smallest DMA mask in the system,
 224  * so a successful GFP_DMA allocation will always satisfy this.
 225  */
 226 u32 arm_dma_limit;
 227
 228 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
 229         unsigned long dma_size)
 230 {
 231         if (size[0] <= dma_size)
 232                 return;
 233
 234         size[ZONE_NORMAL] = size[0] - dma_size;
 235         size[ZONE_DMA] = dma_size;
 236         hole[ZONE_NORMAL] = hole[0];
 237         hole[ZONE_DMA] = 0;
 238 }
 239 #endif
 240
 241 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
 242         unsigned long max_high)
 243 {
 244         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 245         struct memblock_region *reg;
 246
 247         /*
 248          * initialise the zones.
 249          */
 250         memset(zone_size, 0, sizeof(zone_size));
 251
 252         /*
 253          * The memory size has already been determined.  If we need
 254          * to do anything fancy with the allocation of this memory
 255          * to the zones, now is the time to do it.
 256          */
 257         zone_size[0] = max_low - min;
 258 #ifdef CONFIG_HIGHMEM
 259         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 260 #endif
 261
 262         /*
 263          * Calculate the size of the holes.
 264          *  holes = node_size - sum(bank_sizes)
 265          */
 266         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 267         for_each_memblock(memory, reg) {
 268                 unsigned long start = memblock_region_memory_base_pfn(reg);
 269                 unsigned long end = memblock_region_memory_end_pfn(reg);
 270
 271                 if (start < max_low) {
 272                         unsigned long low_end = min(end, max_low);
 273                         zhole_size[0] -= low_end - start;
 274                 }
 275 #ifdef CONFIG_HIGHMEM
 276                 if (end > max_low) {
 277                         unsigned long high_start = max(start, max_low);
 278                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
 279                 }
 280 #endif
 281         }
 282
 283 #ifdef CONFIG_ZONE_DMA
 284         /*
 285          * Adjust the sizes according to any special requirements for
 286          * this machine type.
 287          */
 288         if (arm_dma_zone_size) {
 289                 arm_adjust_dma_zone(zone_size, zhole_size,
 290                         arm_dma_zone_size >> PAGE_SHIFT);
 291                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
 292         } else
 293                 arm_dma_limit = 0xffffffff;
 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 arm_memory_present(void)
 309 {
 310 }
 311 #else
 312 static void 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 int __init meminfo_cmp(const void *_a, const void *_b)
 323 {
 324         const struct membank *a = _a, *b = _b;
 325         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
 326         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
 327 }
 328
 329 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 330 {
 331         int i;
 332
 333         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
 334
 335         memblock_init();
 336         for (i = 0; i < mi->nr_banks; i++)
 337                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 338
 339         /* Register the kernel text, kernel data and initrd with memblock. */
 340 #ifdef CONFIG_XIP_KERNEL
 341         memblock_reserve(__pa(_sdata), _end - _sdata);
 342 #else
 343         memblock_reserve(__pa(_stext), _end - _stext);
 344 #endif
 345 #ifdef CONFIG_BLK_DEV_INITRD
 346         if (phys_initrd_size &&
 347             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
 348                 pr_err("INITRD: 0x%08lx+0x%08lx is not a 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_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
 354                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
 355                        phys_initrd_start, phys_initrd_size);
 356                 phys_initrd_start = phys_initrd_size = 0;
 357         }
 358         if (phys_initrd_size) {
 359                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 360
 361                 /* Now convert initrd to virtual addresses */
 362                 initrd_start = __phys_to_virt(phys_initrd_start);
 363                 initrd_end = initrd_start + phys_initrd_size;
 364         }
 365 #endif
 366
 367         arm_mm_memblock_reserve();
 368         arm_dt_memblock_reserve();
 369
 370         /* reserve any platform specific memblock areas */
 371         if (mdesc->reserve)
 372                 mdesc->reserve();
 373
 374         memblock_analyze();
 375         memblock_dump_all();
 376 }
 377
 378 void __init bootmem_init(void)
 379 {
 380         unsigned long min, max_low, max_high;
 381
 382         max_low = max_high = 0;
 383
 384         find_limits(&min, &max_low, &max_high);
 385
 386         arm_bootmem_init(min, max_low);
 387
 388         /*
 389          * Sparsemem tries to allocate bootmem in memory_present(),
 390          * so must be done after the fixed reservations
 391          */
 392         arm_memory_present();
 393
 394         /*
 395          * sparse_init() needs the bootmem allocator up and running.
 396          */
 397         sparse_init();
 398
 399         /*
 400          * Now free the memory - free_area_init_node needs
 401          * the sparse mem_map arrays initialized by sparse_init()
 402          * for memmap_init_zone(), otherwise all PFNs are invalid.
 403          */
 404         arm_bootmem_free(min, max_low, max_high);
 405
 406         high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1;
 407
 408         /*
 409          * This doesn't seem to be used by the Linux memory manager any
 410          * more, but is used by ll_rw_block.  If we can get rid of it, we
 411          * also get rid of some of the stuff above as well.
 412          *
 413          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 414          * the system, not the maximum PFN.
 415          */
 416         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 417         max_pfn = max_high - PHYS_PFN_OFFSET;
 418 }
 419
 420 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 421 {
 422         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 423
 424         for (; pfn < end; pfn++) {
 425                 struct page *page = pfn_to_page(pfn);
 426                 ClearPageReserved(page);
 427                 init_page_count(page);
 428                 __free_page(page);
 429                 pages++;
 430         }
 431
 432         if (size && s)
 433                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 434
 435         return pages;
 436 }
 437
 438 /*
 439  * Poison init memory with an undefined instruction (ARM) or a branch to an
 440  * undefined instruction (Thumb).
 441  */
 442 static inline void poison_init_mem(void *s, size_t count)
 443 {
 444         u32 *p = (u32 *)s;
 445         for (; count != 0; count -= 4)
 446                 *p++ = 0xe7fddef0;
 447 }
 448
 449 static inline void
 450 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 451 {
 452         struct page *start_pg, *end_pg;
 453         unsigned long pg, pgend;
 454
 455         /*
 456          * Convert start_pfn/end_pfn to a struct page pointer.
 457          */
 458         start_pg = pfn_to_page(start_pfn - 1) + 1;
 459         end_pg = pfn_to_page(end_pfn - 1) + 1;
 460
 461         /*
 462          * Convert to physical addresses, and
 463          * round start upwards and end downwards.
 464          */
 465         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
 466         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
 467
 468         /*
 469          * If there are free pages between these,
 470          * free the section of the memmap array.
 471          */
 472         if (pg < pgend)
 473                 free_bootmem(pg, pgend - pg);
 474 }
 475
 476 /*
 477  * The mem_map array can get very big.  Free the unused area of the memory map.
 478  */
 479 static void __init free_unused_memmap(struct meminfo *mi)
 480 {
 481         unsigned long bank_start, prev_bank_end = 0;
 482         unsigned int i;
 483
 484         /*
 485          * This relies on each bank being in address order.
 486          * The banks are sorted previously in bootmem_init().
 487          */
 488         for_each_bank(i, mi) {
 489                 struct membank *bank = &mi->bank[i];
 490
 491                 bank_start = bank_pfn_start(bank);
 492
 493 #ifdef CONFIG_SPARSEMEM
 494                 /*
 495                  * Take care not to free memmap entries that don't exist
 496                  * due to SPARSEMEM sections which aren't present.
 497                  */
 498                 bank_start = min(bank_start,
 499                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
 500 #else
 501                 /*
 502                  * Align down here since the VM subsystem insists that the
 503                  * memmap entries are valid from the bank start aligned to
 504                  * MAX_ORDER_NR_PAGES.
 505                  */
 506                 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
 507 #endif
 508                 /*
 509                  * If we had a previous bank, and there is a space
 510                  * between the current bank and the previous, free it.
 511                  */
 512                 if (prev_bank_end && prev_bank_end < bank_start)
 513                         free_memmap(prev_bank_end, bank_start);
 514
 515                 /*
 516                  * Align up here since the VM subsystem insists that the
 517                  * memmap entries are valid from the bank end aligned to
 518                  * MAX_ORDER_NR_PAGES.
 519                  */
 520                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 521         }
 522
 523 #ifdef CONFIG_SPARSEMEM
 524         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
 525                 free_memmap(prev_bank_end,
 526                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
 527 #endif
 528 }
 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                                 totalhigh_pages += free_area(start, res_start,
 566                                                              NULL);
 567                         start = res_end;
 568                         if (start == end)
 569                                 break;
 570                 }
 571
 572                 /* And now free anything which remains */
 573                 if (start < end)
 574                         totalhigh_pages += free_area(start, end, NULL);
 575         }
 576         totalram_pages += totalhigh_pages;
 577 #endif
 578 }
 579
 580 /*
 581  * mem_init() marks the free areas in the mem_map and tells us how much
 582  * memory is free.  This is done after various parts of the system have
 583  * claimed their memory after the kernel image.
 584  */
 585 void __init mem_init(void)
 586 {
 587         unsigned long reserved_pages, free_pages;
 588         struct memblock_region *reg;
 589         int i;
 590 #ifdef CONFIG_HAVE_TCM
 591         /* These pointers are filled in on TCM detection */
 592         extern u32 dtcm_end;
 593         extern u32 itcm_end;
 594 #endif
 595
 596         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 597
 598         /* this will put all unused low memory onto the freelists */
 599         free_unused_memmap(&meminfo);
 600
 601         totalram_pages += free_all_bootmem();
 602
 603 #ifdef CONFIG_SA1111
 604         /* now that our DMA memory is actually so designated, we can free it */
 605         totalram_pages += free_area(PHYS_PFN_OFFSET,
 606                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 607 #endif
 608
 609         free_highpages();
 610
 611         reserved_pages = free_pages = 0;
 612
 613         for_each_bank(i, &meminfo) {
 614                 struct membank *bank = &meminfo.bank[i];
 615                 unsigned int pfn1, pfn2;
 616                 struct page *page, *end;
 617
 618                 pfn1 = bank_pfn_start(bank);
 619                 pfn2 = bank_pfn_end(bank);
 620
 621                 page = pfn_to_page(pfn1);
 622                 end  = pfn_to_page(pfn2 - 1) + 1;
 623
 624                 do {
 625                         if (PageReserved(page))
 626                                 reserved_pages++;
 627                         else if (!page_count(page))
 628                                 free_pages++;
 629                         page++;
 630                 } while (page < end);
 631         }
 632
 633         /*
 634          * Since our memory may not be contiguous, calculate the
 635          * real number of pages we have in this system
 636          */
 637         printk(KERN_INFO "Memory:");
 638         num_physpages = 0;
 639         for_each_memblock(memory, reg) {
 640                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 641                         memblock_region_memory_base_pfn(reg);
 642                 num_physpages += pages;
 643                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 644         }
 645         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 646
 647         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 648                 nr_free_pages() << (PAGE_SHIFT-10),
 649                 free_pages << (PAGE_SHIFT-10),
 650                 reserved_pages << (PAGE_SHIFT-10),
 651                 totalhigh_pages << (PAGE_SHIFT-10));
 652
 653 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 654 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 655 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 656
 657         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 658                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 659 #ifdef CONFIG_HAVE_TCM
 660                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 661                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 662 #endif
 663                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 664                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 665                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 666 #ifdef CONFIG_HIGHMEM
 667                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 668 #endif
 669                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 670                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 671                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 672                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
 673                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
 674
 675                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 676                                 (PAGE_SIZE)),
 677 #ifdef CONFIG_HAVE_TCM
 678                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 679                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 680 #endif
 681                         MLK(FIXADDR_START, FIXADDR_TOP),
 682                         MLM(VMALLOC_START, VMALLOC_END),
 683                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 684 #ifdef CONFIG_HIGHMEM
 685                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 686                                 (PAGE_SIZE)),
 687 #endif
 688                         MLM(MODULES_VADDR, MODULES_END),
 689
 690                         MLK_ROUNDUP(_text, _etext),
 691                         MLK_ROUNDUP(__init_begin, __init_end),
 692                         MLK_ROUNDUP(_sdata, _edata),
 693                         MLK_ROUNDUP(__bss_start, __bss_stop));
 694
 695 #undef MLK
 696 #undef MLM
 697 #undef MLK_ROUNDUP
 698
 699         /*
 700          * Check boundaries twice: Some fundamental inconsistencies can
 701          * be detected at build time already.
 702          */
 703 #ifdef CONFIG_MMU
 704         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 705         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 706 #endif
 707
 708 #ifdef CONFIG_HIGHMEM
 709         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 710         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 711 #endif
 712
 713         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 714                 extern int sysctl_overcommit_memory;
 715                 /*
 716                  * On a machine this small we won't get
 717                  * anywhere without overcommit, so turn
 718                  * it on by default.
 719                  */
 720                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 721         }
 722 }
 723
 724 void free_initmem(void)
 725 {
 726 #ifdef CONFIG_HAVE_TCM
 727         extern char __tcm_start, __tcm_end;
 728
 729         poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
 730         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 731                                     __phys_to_pfn(__pa(&__tcm_end)),
 732                                     "TCM link");
 733 #endif
 734
 735         poison_init_mem(__init_begin, __init_end - __init_begin);
 736         if (!machine_is_integrator() && !machine_is_cintegrator())
 737                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 738                                             __phys_to_pfn(__pa(__init_end)),
 739                                             "init");
 740 }
 741
 742 #ifdef CONFIG_BLK_DEV_INITRD
 743
 744 static int keep_initrd;
 745
 746 void free_initrd_mem(unsigned long start, unsigned long end)
 747 {
 748         if (!keep_initrd) {
 749                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
 750                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 751                                             __phys_to_pfn(__pa(end)),
 752                                             "initrd");
 753         }
 754 }
 755
 756 static int __init keepinitrd_setup(char *__unused)
 757 {
 758         keep_initrd = 1;
 759         return 1;
 760 }
 761
 762 __setup("keepinitrd", keepinitrd_setup);
 763 #endif