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         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 phys_addr_t 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 void __init setup_dma_zone(struct machine_desc *mdesc)
 231 {
 232 #ifdef CONFIG_ZONE_DMA
 233         if (mdesc->dma_zone_size) {
 234                 arm_dma_zone_size = mdesc->dma_zone_size;
 235                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
 236         } else
 237                 arm_dma_limit = 0xffffffff;
 238 #endif
 239 }
 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 #endif
 292
 293         free_area_init_node(0, zone_size, min, zhole_size);
 294 }
 295
 296 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 297 int pfn_valid(unsigned long pfn)
 298 {
 299         return memblock_is_memory(__pfn_to_phys(pfn));
 300 }
 301 EXPORT_SYMBOL(pfn_valid);
 302 #endif
 303
 304 #ifndef CONFIG_SPARSEMEM
 305 static void __init arm_memory_present(void)
 306 {
 307 }
 308 #else
 309 static void __init arm_memory_present(void)
 310 {
 311         struct memblock_region *reg;
 312
 313         for_each_memblock(memory, reg)
 314                 memory_present(0, memblock_region_memory_base_pfn(reg),
 315                                memblock_region_memory_end_pfn(reg));
 316 }
 317 #endif
 318
 319 static bool arm_memblock_steal_permitted = true;
 320
 321 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
 322 {
 323         phys_addr_t phys;
 324
 325         BUG_ON(!arm_memblock_steal_permitted);
 326
 327         phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
 328         memblock_free(phys, size);
 329         memblock_remove(phys, size);
 330
 331         return phys;
 332 }
 333
 334 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 335 {
 336         int i;
 337
 338         for (i = 0; i < mi->nr_banks; i++)
 339                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 340
 341         /* Register the kernel text, kernel data and initrd with memblock. */
 342 #ifdef CONFIG_XIP_KERNEL
 343         memblock_reserve(__pa(_sdata), _end - _sdata);
 344 #else
 345         memblock_reserve(__pa(_stext), _end - _stext);
 346 #endif
 347 #ifdef CONFIG_BLK_DEV_INITRD
 348         if (phys_initrd_size &&
 349             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
 350                 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
 351                        phys_initrd_start, phys_initrd_size);
 352                 phys_initrd_start = phys_initrd_size = 0;
 353         }
 354         if (phys_initrd_size &&
 355             memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
 356                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
 357                        phys_initrd_start, phys_initrd_size);
 358                 phys_initrd_start = phys_initrd_size = 0;
 359         }
 360         if (phys_initrd_size) {
 361                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 362
 363                 /* Now convert initrd to virtual addresses */
 364                 initrd_start = __phys_to_virt(phys_initrd_start);
 365                 initrd_end = initrd_start + phys_initrd_size;
 366         }
 367 #endif
 368
 369         arm_mm_memblock_reserve();
 370         arm_dt_memblock_reserve();
 371
 372         /* reserve any platform specific memblock areas */
 373         if (mdesc->reserve)
 374                 mdesc->reserve();
 375
 376         /*
 377          * reserve memory for DMA contigouos allocations,
 378          * must come from DMA area inside low memory
 379          */
 380         dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit));
 381
 382         arm_memblock_steal_permitted = false;
 383         memblock_allow_resize();
 384         memblock_dump_all();
 385 }
 386
 387 void __init bootmem_init(void)
 388 {
 389         unsigned long min, max_low, max_high;
 390
 391         max_low = max_high = 0;
 392
 393         find_limits(&min, &max_low, &max_high);
 394
 395         arm_bootmem_init(min, max_low);
 396
 397         /*
 398          * Sparsemem tries to allocate bootmem in memory_present(),
 399          * so must be done after the fixed reservations
 400          */
 401         arm_memory_present();
 402
 403         /*
 404          * sparse_init() needs the bootmem allocator up and running.
 405          */
 406         sparse_init();
 407
 408         /*
 409          * Now free the memory - free_area_init_node needs
 410          * the sparse mem_map arrays initialized by sparse_init()
 411          * for memmap_init_zone(), otherwise all PFNs are invalid.
 412          */
 413         arm_bootmem_free(min, max_low, max_high);
 414
 415         /*
 416          * This doesn't seem to be used by the Linux memory manager any
 417          * more, but is used by ll_rw_block.  If we can get rid of it, we
 418          * also get rid of some of the stuff above as well.
 419          *
 420          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 421          * the system, not the maximum PFN.
 422          */
 423         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 424         max_pfn = max_high - PHYS_PFN_OFFSET;
 425 }
 426
 427 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 428 {
 429         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 430
 431         for (; pfn < end; pfn++) {
 432                 struct page *page = pfn_to_page(pfn);
 433                 ClearPageReserved(page);
 434                 init_page_count(page);
 435                 __free_page(page);
 436                 pages++;
 437         }
 438
 439         if (size && s)
 440                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 441
 442         return pages;
 443 }
 444
 445 /*
 446  * Poison init memory with an undefined instruction (ARM) or a branch to an
 447  * undefined instruction (Thumb).
 448  */
 449 static inline void poison_init_mem(void *s, size_t count)
 450 {
 451         u32 *p = (u32 *)s;
 452         for (; count != 0; count -= 4)
 453                 *p++ = 0xe7fddef0;
 454 }
 455
 456 static inline void
 457 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 458 {
 459         struct page *start_pg, *end_pg;
 460         unsigned long pg, pgend;
 461
 462         /*
 463          * Convert start_pfn/end_pfn to a struct page pointer.
 464          */
 465         start_pg = pfn_to_page(start_pfn - 1) + 1;
 466         end_pg = pfn_to_page(end_pfn - 1) + 1;
 467
 468         /*
 469          * Convert to physical addresses, and
 470          * round start upwards and end downwards.
 471          */
 472         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
 473         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
 474
 475         /*
 476          * If there are free pages between these,
 477          * free the section of the memmap array.
 478          */
 479         if (pg < pgend)
 480                 free_bootmem(pg, pgend - pg);
 481 }
 482
 483 /*
 484  * The mem_map array can get very big.  Free the unused area of the memory map.
 485  */
 486 static void __init free_unused_memmap(struct meminfo *mi)
 487 {
 488         unsigned long bank_start, prev_bank_end = 0;
 489         unsigned int i;
 490
 491         /*
 492          * This relies on each bank being in address order.
 493          * The banks are sorted previously in bootmem_init().
 494          */
 495         for_each_bank(i, mi) {
 496                 struct membank *bank = &mi->bank[i];
 497
 498                 bank_start = bank_pfn_start(bank);
 499
 500 #ifdef CONFIG_SPARSEMEM
 501                 /*
 502                  * Take care not to free memmap entries that don't exist
 503                  * due to SPARSEMEM sections which aren't present.
 504                  */
 505                 bank_start = min(bank_start,
 506                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
 507 #else
 508                 /*
 509                  * Align down here since the VM subsystem insists that the
 510                  * memmap entries are valid from the bank start aligned to
 511                  * MAX_ORDER_NR_PAGES.
 512                  */
 513                 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
 514 #endif
 515                 /*
 516                  * If we had a previous bank, and there is a space
 517                  * between the current bank and the previous, free it.
 518                  */
 519                 if (prev_bank_end && prev_bank_end < bank_start)
 520                         free_memmap(prev_bank_end, bank_start);
 521
 522                 /*
 523                  * Align up here since the VM subsystem insists that the
 524                  * memmap entries are valid from the bank end aligned to
 525                  * MAX_ORDER_NR_PAGES.
 526                  */
 527                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 528         }
 529
 530 #ifdef CONFIG_SPARSEMEM
 531         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
 532                 free_memmap(prev_bank_end,
 533                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
 534 #endif
 535 }
 536
 537 static void __init free_highpages(void)
 538 {
 539 #ifdef CONFIG_HIGHMEM
 540         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
 541         struct memblock_region *mem, *res;
 542
 543         /* set highmem page free */
 544         for_each_memblock(memory, mem) {
 545                 unsigned long start = memblock_region_memory_base_pfn(mem);
 546                 unsigned long end = memblock_region_memory_end_pfn(mem);
 547
 548                 /* Ignore complete lowmem entries */
 549                 if (end <= max_low)
 550                         continue;
 551
 552                 /* Truncate partial highmem entries */
 553                 if (start < max_low)
 554                         start = max_low;
 555
 556                 /* Find and exclude any reserved regions */
 557                 for_each_memblock(reserved, res) {
 558                         unsigned long res_start, res_end;
 559
 560                         res_start = memblock_region_reserved_base_pfn(res);
 561                         res_end = memblock_region_reserved_end_pfn(res);
 562
 563                         if (res_end < start)
 564                                 continue;
 565                         if (res_start < start)
 566                                 res_start = start;
 567                         if (res_start > end)
 568                                 res_start = end;
 569                         if (res_end > end)
 570                                 res_end = end;
 571                         if (res_start != start)
 572                                 totalhigh_pages += free_area(start, res_start,
 573                                                              NULL);
 574                         start = res_end;
 575                         if (start == end)
 576                                 break;
 577                 }
 578
 579                 /* And now free anything which remains */
 580                 if (start < end)
 581                         totalhigh_pages += free_area(start, end, NULL);
 582         }
 583         totalram_pages += totalhigh_pages;
 584 #endif
 585 }
 586
 587 /*
 588  * mem_init() marks the free areas in the mem_map and tells us how much
 589  * memory is free.  This is done after various parts of the system have
 590  * claimed their memory after the kernel image.
 591  */
 592 void __init mem_init(void)
 593 {
 594         unsigned long reserved_pages, free_pages;
 595         struct memblock_region *reg;
 596         int i;
 597 #ifdef CONFIG_HAVE_TCM
 598         /* These pointers are filled in on TCM detection */
 599         extern u32 dtcm_end;
 600         extern u32 itcm_end;
 601 #endif
 602
 603         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 604
 605         /* this will put all unused low memory onto the freelists */
 606         free_unused_memmap(&meminfo);
 607
 608         totalram_pages += free_all_bootmem();
 609
 610 #ifdef CONFIG_SA1111
 611         /* now that our DMA memory is actually so designated, we can free it */
 612         totalram_pages += free_area(PHYS_PFN_OFFSET,
 613                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 614 #endif
 615
 616         free_highpages();
 617
 618         reserved_pages = free_pages = 0;
 619
 620         for_each_bank(i, &meminfo) {
 621                 struct membank *bank = &meminfo.bank[i];
 622                 unsigned int pfn1, pfn2;
 623                 struct page *page, *end;
 624
 625                 pfn1 = bank_pfn_start(bank);
 626                 pfn2 = bank_pfn_end(bank);
 627
 628                 page = pfn_to_page(pfn1);
 629                 end  = pfn_to_page(pfn2 - 1) + 1;
 630
 631                 do {
 632                         if (PageReserved(page))
 633                                 reserved_pages++;
 634                         else if (!page_count(page))
 635                                 free_pages++;
 636                         page++;
 637                 } while (page < end);
 638         }
 639
 640         /*
 641          * Since our memory may not be contiguous, calculate the
 642          * real number of pages we have in this system
 643          */
 644         printk(KERN_INFO "Memory:");
 645         num_physpages = 0;
 646         for_each_memblock(memory, reg) {
 647                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 648                         memblock_region_memory_base_pfn(reg);
 649                 num_physpages += pages;
 650                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 651         }
 652         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 653
 654         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 655                 nr_free_pages() << (PAGE_SHIFT-10),
 656                 free_pages << (PAGE_SHIFT-10),
 657                 reserved_pages << (PAGE_SHIFT-10),
 658                 totalhigh_pages << (PAGE_SHIFT-10));
 659
 660 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 661 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 662 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 663
 664         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 665                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 666 #ifdef CONFIG_HAVE_TCM
 667                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 668                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 669 #endif
 670                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 671                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 672                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 673 #ifdef CONFIG_HIGHMEM
 674                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 675 #endif
 676 #ifdef CONFIG_MODULES
 677                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 678 #endif
 679                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 680                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 681                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
 682                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
 683
 684                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 685                                 (PAGE_SIZE)),
 686 #ifdef CONFIG_HAVE_TCM
 687                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 688                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 689 #endif
 690                         MLK(FIXADDR_START, FIXADDR_TOP),
 691                         MLM(VMALLOC_START, VMALLOC_END),
 692                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 693 #ifdef CONFIG_HIGHMEM
 694                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 695                                 (PAGE_SIZE)),
 696 #endif
 697 #ifdef CONFIG_MODULES
 698                         MLM(MODULES_VADDR, MODULES_END),
 699 #endif
 700
 701                         MLK_ROUNDUP(_text, _etext),
 702                         MLK_ROUNDUP(__init_begin, __init_end),
 703                         MLK_ROUNDUP(_sdata, _edata),
 704                         MLK_ROUNDUP(__bss_start, __bss_stop));
 705
 706 #undef MLK
 707 #undef MLM
 708 #undef MLK_ROUNDUP
 709
 710         /*
 711          * Check boundaries twice: Some fundamental inconsistencies can
 712          * be detected at build time already.
 713          */
 714 #ifdef CONFIG_MMU
 715         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 716         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 717 #endif
 718
 719 #ifdef CONFIG_HIGHMEM
 720         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 721         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 722 #endif
 723
 724         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 725                 extern int sysctl_overcommit_memory;
 726                 /*
 727                  * On a machine this small we won't get
 728                  * anywhere without overcommit, so turn
 729                  * it on by default.
 730                  */
 731                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 732         }
 733 }
 734
 735 void free_initmem(void)
 736 {
 737 #ifdef CONFIG_HAVE_TCM
 738         extern char __tcm_start, __tcm_end;
 739
 740         poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
 741         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 742                                     __phys_to_pfn(__pa(&__tcm_end)),
 743                                     "TCM link");
 744 #endif
 745
 746         poison_init_mem(__init_begin, __init_end - __init_begin);
 747         if (!machine_is_integrator() && !machine_is_cintegrator())
 748                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 749                                             __phys_to_pfn(__pa(__init_end)),
 750                                             "init");
 751 }
 752
 753 #ifdef CONFIG_BLK_DEV_INITRD
 754
 755 static int keep_initrd;
 756
 757 void free_initrd_mem(unsigned long start, unsigned long end)
 758 {
 759         if (!keep_initrd) {
 760                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
 761                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 762                                             __phys_to_pfn(__pa(end)),
 763                                             "initrd");
 764         }
 765 }
 766
 767 static int __init keepinitrd_setup(char *__unused)
 768 {
 769         keep_initrd = 1;
 770         return 1;
 771 }
 772
 773 __setup("keepinitrd", keepinitrd_setup);
 774 #endif