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