arch/arm/mm/init.c

   1 /*
   2  *  linux/arch/arm/mm/init.c
   3  *
   4  *  Copyright (C) 1995-2005 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/errno.h>
  12 #include <linux/swap.h>
  13 #include <linux/init.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/mman.h>
  16 #include <linux/nodemask.h>
  17 #include <linux/initrd.h>
  18 #include <linux/of_fdt.h>
  19 #include <linux/highmem.h>
  20 #include <linux/gfp.h>
  21 #include <linux/memblock.h>
  22 #include <linux/sort.h>
  23
  24 #include <asm/mach-types.h>
  25 #include <asm/prom.h>
  26 #include <asm/sections.h>
  27 #include <asm/setup.h>
  28 #include <asm/sizes.h>
  29 #include <asm/tlb.h>
  30 #include <asm/fixmap.h>
  31
  32 #include <asm/mach/arch.h>
  33 #include <asm/mach/map.h>
  34
  35 #include "mm.h"
  36
  37 static unsigned long phys_initrd_start __initdata = 0;
  38 static unsigned long phys_initrd_size __initdata = 0;
  39
  40 static int __init early_initrd(char *p)
  41 {
  42         unsigned long start, size;
  43         char *endp;
  44
  45         start = memparse(p, &endp);
  46         if (*endp == ',') {
  47                 size = memparse(endp + 1, NULL);
  48
  49                 phys_initrd_start = start;
  50                 phys_initrd_size = size;
  51         }
  52         return 0;
  53 }
  54 early_param("initrd", early_initrd);
  55
  56 static int __init parse_tag_initrd(const struct tag *tag)
  57 {
  58         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
  59                 "please update your bootloader.\n");
  60         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  61         phys_initrd_size = tag->u.initrd.size;
  62         return 0;
  63 }
  64
  65 __tagtable(ATAG_INITRD, parse_tag_initrd);
  66
  67 static int __init parse_tag_initrd2(const struct tag *tag)
  68 {
  69         phys_initrd_start = tag->u.initrd.start;
  70         phys_initrd_size = tag->u.initrd.size;
  71         return 0;
  72 }
  73
  74 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  75
  76 #ifdef CONFIG_OF_FLATTREE
  77 void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
  78 {
  79         phys_initrd_start = start;
  80         phys_initrd_size = end - start;
  81 }
  82 #endif /* CONFIG_OF_FLATTREE */
  83
  84 /*
  85  * This keeps memory configuration data used by a couple memory
  86  * initialization functions, as well as show_mem() for the skipping
  87  * of holes in the memory map.  It is populated by arm_add_memory().
  88  */
  89 struct meminfo meminfo;
  90
  91 void show_mem(unsigned int filter)
  92 {
  93         int free = 0, total = 0, reserved = 0;
  94         int shared = 0, cached = 0, slab = 0, i;
  95         struct meminfo * mi = &meminfo;
  96
  97         printk("Mem-info:\n");
  98         show_free_areas(filter);
  99
 100         for_each_bank (i, mi) {
 101                 struct membank *bank = &mi->bank[i];
 102                 unsigned int pfn1, pfn2;
 103                 struct page *page, *end;
 104
 105                 pfn1 = bank_pfn_start(bank);
 106                 pfn2 = bank_pfn_end(bank);
 107
 108                 page = pfn_to_page(pfn1);
 109                 end  = pfn_to_page(pfn2 - 1) + 1;
 110
 111                 do {
 112                         total++;
 113                         if (PageReserved(page))
 114                                 reserved++;
 115                         else if (PageSwapCache(page))
 116                                 cached++;
 117                         else if (PageSlab(page))
 118                                 slab++;
 119                         else if (!page_count(page))
 120                                 free++;
 121                         else
 122                                 shared += page_count(page) - 1;
 123                         page++;
 124                 } while (page < end);
 125         }
 126
 127         printk("%d pages of RAM\n", total);
 128         printk("%d free pages\n", free);
 129         printk("%d reserved pages\n", reserved);
 130         printk("%d slab pages\n", slab);
 131         printk("%d pages shared\n", shared);
 132         printk("%d pages swap cached\n", cached);
 133 }
 134
 135 static void __init find_limits(unsigned long *min, unsigned long *max_low,
 136         unsigned long *max_high)
 137 {
 138         struct meminfo *mi = &meminfo;
 139         int i;
 140
 141         *min = -1UL;
 142         *max_low = *max_high = 0;
 143
 144         for_each_bank (i, mi) {
 145                 struct membank *bank = &mi->bank[i];
 146                 unsigned long start, end;
 147
 148                 start = bank_pfn_start(bank);
 149                 end = bank_pfn_end(bank);
 150
 151                 if (*min > start)
 152                         *min = start;
 153                 if (*max_high < end)
 154                         *max_high = end;
 155                 if (bank->highmem)
 156                         continue;
 157                 if (*max_low < end)
 158                         *max_low = end;
 159         }
 160 }
 161
 162 static void __init arm_bootmem_init(unsigned long start_pfn,
 163         unsigned long end_pfn)
 164 {
 165         struct memblock_region *reg;
 166         unsigned int boot_pages;
 167         phys_addr_t bitmap;
 168         pg_data_t *pgdat;
 169
 170         /*
 171          * Allocate the bootmem bitmap page.  This must be in a region
 172          * of memory which has already been mapped.
 173          */
 174         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 175         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
 176                                 __pfn_to_phys(end_pfn));
 177
 178         /*
 179          * Initialise the bootmem allocator, handing the
 180          * memory banks over to bootmem.
 181          */
 182         node_set_online(0);
 183         pgdat = NODE_DATA(0);
 184         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 185
 186         /* Free the lowmem regions from memblock into bootmem. */
 187         for_each_memblock(memory, reg) {
 188                 unsigned long start = memblock_region_memory_base_pfn(reg);
 189                 unsigned long end = memblock_region_memory_end_pfn(reg);
 190
 191                 if (end >= end_pfn)
 192                         end = end_pfn;
 193                 if (start >= end)
 194                         break;
 195
 196                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
 197         }
 198
 199         /* Reserve the lowmem memblock reserved regions in bootmem. */
 200         for_each_memblock(reserved, reg) {
 201                 unsigned long start = memblock_region_reserved_base_pfn(reg);
 202                 unsigned long end = memblock_region_reserved_end_pfn(reg);
 203
 204                 if (end >= end_pfn)
 205                         end = end_pfn;
 206                 if (start >= end)
 207                         break;
 208
 209                 reserve_bootmem(__pfn_to_phys(start),
 210                                 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
 211         }
 212 }
 213
 214 #ifdef CONFIG_ZONE_DMA
 215 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
 216         unsigned long dma_size)
 217 {
 218         if (size[0] <= dma_size)
 219                 return;
 220
 221         size[ZONE_NORMAL] = size[0] - dma_size;
 222         size[ZONE_DMA] = dma_size;
 223         hole[ZONE_NORMAL] = hole[0];
 224         hole[ZONE_DMA] = 0;
 225 }
 226 #endif
 227
 228 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
 229         unsigned long max_high)
 230 {
 231         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 232         struct memblock_region *reg;
 233
 234         /*
 235          * initialise the zones.
 236          */
 237         memset(zone_size, 0, sizeof(zone_size));
 238
 239         /*
 240          * The memory size has already been determined.  If we need
 241          * to do anything fancy with the allocation of this memory
 242          * to the zones, now is the time to do it.
 243          */
 244         zone_size[0] = max_low - min;
 245 #ifdef CONFIG_HIGHMEM
 246         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 247 #endif
 248
 249         /*
 250          * Calculate the size of the holes.
 251          *  holes = node_size - sum(bank_sizes)
 252          */
 253         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 254         for_each_memblock(memory, reg) {
 255                 unsigned long start = memblock_region_memory_base_pfn(reg);
 256                 unsigned long end = memblock_region_memory_end_pfn(reg);
 257
 258                 if (start < max_low) {
 259                         unsigned long low_end = min(end, max_low);
 260                         zhole_size[0] -= low_end - start;
 261                 }
 262 #ifdef CONFIG_HIGHMEM
 263                 if (end > max_low) {
 264                         unsigned long high_start = max(start, max_low);
 265                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
 266                 }
 267 #endif
 268         }
 269
 270 #ifdef ARM_DMA_ZONE_SIZE
 271 #ifndef CONFIG_ZONE_DMA
 272 #error ARM_DMA_ZONE_SIZE set but no DMA zone to limit allocations
 273 #endif
 274
 275         /*
 276          * Adjust the sizes according to any special requirements for
 277          * this machine type.
 278          */
 279         arm_adjust_dma_zone(zone_size, zhole_size,
 280                 ARM_DMA_ZONE_SIZE >> PAGE_SHIFT);
 281 #endif
 282
 283         free_area_init_node(0, zone_size, min, zhole_size);
 284 }
 285
 286 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 287 int pfn_valid(unsigned long pfn)
 288 {
 289         return memblock_is_memory(pfn << PAGE_SHIFT);
 290 }
 291 EXPORT_SYMBOL(pfn_valid);
 292 #endif
 293
 294 #ifndef CONFIG_SPARSEMEM
 295 static void arm_memory_present(void)
 296 {
 297 }
 298 #else
 299 static void arm_memory_present(void)
 300 {
 301         struct memblock_region *reg;
 302
 303         for_each_memblock(memory, reg)
 304                 memory_present(0, memblock_region_memory_base_pfn(reg),
 305                                memblock_region_memory_end_pfn(reg));
 306 }
 307 #endif
 308
 309 static int __init meminfo_cmp(const void *_a, const void *_b)
 310 {
 311         const struct membank *a = _a, *b = _b;
 312         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
 313         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
 314 }
 315
 316 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 317 {
 318         int i;
 319
 320         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
 321
 322         memblock_init();
 323         for (i = 0; i < mi->nr_banks; i++)
 324                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 325
 326         /* Register the kernel text, kernel data and initrd with memblock. */
 327 #ifdef CONFIG_XIP_KERNEL
 328         memblock_reserve(__pa(_sdata), _end - _sdata);
 329 #else
 330         memblock_reserve(__pa(_stext), _end - _stext);
 331 #endif
 332 #ifdef CONFIG_BLK_DEV_INITRD
 333         if (phys_initrd_size &&
 334             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
 335                 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
 336                        phys_initrd_start, phys_initrd_size);
 337                 phys_initrd_start = phys_initrd_size = 0;
 338         }
 339         if (phys_initrd_size &&
 340             memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
 341                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
 342                        phys_initrd_start, phys_initrd_size);
 343                 phys_initrd_start = phys_initrd_size = 0;
 344         }
 345         if (phys_initrd_size) {
 346                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 347
 348                 /* Now convert initrd to virtual addresses */
 349                 initrd_start = __phys_to_virt(phys_initrd_start);
 350                 initrd_end = initrd_start + phys_initrd_size;
 351         }
 352 #endif
 353
 354         arm_mm_memblock_reserve();
 355         arm_dt_memblock_reserve();
 356
 357         /* reserve any platform specific memblock areas */
 358         if (mdesc->reserve)
 359                 mdesc->reserve();
 360
 361         memblock_analyze();
 362         memblock_dump_all();
 363 }
 364
 365 void __init bootmem_init(void)
 366 {
 367         unsigned long min, max_low, max_high;
 368
 369         max_low = max_high = 0;
 370
 371         find_limits(&min, &max_low, &max_high);
 372
 373         arm_bootmem_init(min, max_low);
 374
 375         /*
 376          * Sparsemem tries to allocate bootmem in memory_present(),
 377          * so must be done after the fixed reservations
 378          */
 379         arm_memory_present();
 380
 381         /*
 382          * sparse_init() needs the bootmem allocator up and running.
 383          */
 384         sparse_init();
 385
 386         /*
 387          * Now free the memory - free_area_init_node needs
 388          * the sparse mem_map arrays initialized by sparse_init()
 389          * for memmap_init_zone(), otherwise all PFNs are invalid.
 390          */
 391         arm_bootmem_free(min, max_low, max_high);
 392
 393         high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1;
 394
 395         /*
 396          * This doesn't seem to be used by the Linux memory manager any
 397          * more, but is used by ll_rw_block.  If we can get rid of it, we
 398          * also get rid of some of the stuff above as well.
 399          *
 400          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 401          * the system, not the maximum PFN.
 402          */
 403         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 404         max_pfn = max_high - PHYS_PFN_OFFSET;
 405 }
 406
 407 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 408 {
 409         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 410
 411         for (; pfn < end; pfn++) {
 412                 struct page *page = pfn_to_page(pfn);
 413                 ClearPageReserved(page);
 414                 init_page_count(page);
 415                 __free_page(page);
 416                 pages++;
 417         }
 418
 419         if (size && s)
 420                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 421
 422         return pages;
 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 #endif
 477                 /*
 478                  * If we had a previous bank, and there is a space
 479                  * between the current bank and the previous, free it.
 480                  */
 481                 if (prev_bank_end && prev_bank_end < bank_start)
 482                         free_memmap(prev_bank_end, bank_start);
 483
 484                 /*
 485                  * Align up here since the VM subsystem insists that the
 486                  * memmap entries are valid from the bank end aligned to
 487                  * MAX_ORDER_NR_PAGES.
 488                  */
 489                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 490         }
 491
 492 #ifdef CONFIG_SPARSEMEM
 493         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
 494                 free_memmap(prev_bank_end,
 495                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
 496 #endif
 497 }
 498
 499 static void __init free_highpages(void)
 500 {
 501 #ifdef CONFIG_HIGHMEM
 502         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
 503         struct memblock_region *mem, *res;
 504
 505         /* set highmem page free */
 506         for_each_memblock(memory, mem) {
 507                 unsigned long start = memblock_region_memory_base_pfn(mem);
 508                 unsigned long end = memblock_region_memory_end_pfn(mem);
 509
 510                 /* Ignore complete lowmem entries */
 511                 if (end <= max_low)
 512                         continue;
 513
 514                 /* Truncate partial highmem entries */
 515                 if (start < max_low)
 516                         start = max_low;
 517
 518                 /* Find and exclude any reserved regions */
 519                 for_each_memblock(reserved, res) {
 520                         unsigned long res_start, res_end;
 521
 522                         res_start = memblock_region_reserved_base_pfn(res);
 523                         res_end = memblock_region_reserved_end_pfn(res);
 524
 525                         if (res_end < start)
 526                                 continue;
 527                         if (res_start < start)
 528                                 res_start = start;
 529                         if (res_start > end)
 530                                 res_start = end;
 531                         if (res_end > end)
 532                                 res_end = end;
 533                         if (res_start != start)
 534                                 totalhigh_pages += free_area(start, res_start,
 535                                                              NULL);
 536                         start = res_end;
 537                         if (start == end)
 538                                 break;
 539                 }
 540
 541                 /* And now free anything which remains */
 542                 if (start < end)
 543                         totalhigh_pages += free_area(start, end, NULL);
 544         }
 545         totalram_pages += totalhigh_pages;
 546 #endif
 547 }
 548
 549 /*
 550  * mem_init() marks the free areas in the mem_map and tells us how much
 551  * memory is free.  This is done after various parts of the system have
 552  * claimed their memory after the kernel image.
 553  */
 554 void __init mem_init(void)
 555 {
 556         unsigned long reserved_pages, free_pages;
 557         struct memblock_region *reg;
 558         int i;
 559 #ifdef CONFIG_HAVE_TCM
 560         /* These pointers are filled in on TCM detection */
 561         extern u32 dtcm_end;
 562         extern u32 itcm_end;
 563 #endif
 564
 565         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 566
 567         /* this will put all unused low memory onto the freelists */
 568         free_unused_memmap(&meminfo);
 569
 570         totalram_pages += free_all_bootmem();
 571
 572 #ifdef CONFIG_SA1111
 573         /* now that our DMA memory is actually so designated, we can free it */
 574         totalram_pages += free_area(PHYS_PFN_OFFSET,
 575                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 576 #endif
 577
 578         free_highpages();
 579
 580         reserved_pages = free_pages = 0;
 581
 582         for_each_bank(i, &meminfo) {
 583                 struct membank *bank = &meminfo.bank[i];
 584                 unsigned int pfn1, pfn2;
 585                 struct page *page, *end;
 586
 587                 pfn1 = bank_pfn_start(bank);
 588                 pfn2 = bank_pfn_end(bank);
 589
 590                 page = pfn_to_page(pfn1);
 591                 end  = pfn_to_page(pfn2 - 1) + 1;
 592
 593                 do {
 594                         if (PageReserved(page))
 595                                 reserved_pages++;
 596                         else if (!page_count(page))
 597                                 free_pages++;
 598                         page++;
 599                 } while (page < end);
 600         }
 601
 602         /*
 603          * Since our memory may not be contiguous, calculate the
 604          * real number of pages we have in this system
 605          */
 606         printk(KERN_INFO "Memory:");
 607         num_physpages = 0;
 608         for_each_memblock(memory, reg) {
 609                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 610                         memblock_region_memory_base_pfn(reg);
 611                 num_physpages += pages;
 612                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 613         }
 614         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 615
 616         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 617                 nr_free_pages() << (PAGE_SHIFT-10),
 618                 free_pages << (PAGE_SHIFT-10),
 619                 reserved_pages << (PAGE_SHIFT-10),
 620                 totalhigh_pages << (PAGE_SHIFT-10));
 621
 622 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 623 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 624 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 625
 626         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 627                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 628 #ifdef CONFIG_HAVE_TCM
 629                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 630                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 631 #endif
 632                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 633 #ifdef CONFIG_MMU
 634                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 635 #endif
 636                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 637                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 638 #ifdef CONFIG_HIGHMEM
 639                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 640 #endif
 641                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 642                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 643                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 644                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
 645                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
 646
 647                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 648                                 (PAGE_SIZE)),
 649 #ifdef CONFIG_HAVE_TCM
 650                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 651                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 652 #endif
 653                         MLK(FIXADDR_START, FIXADDR_TOP),
 654 #ifdef CONFIG_MMU
 655                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 656 #endif
 657                         MLM(VMALLOC_START, VMALLOC_END),
 658                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 659 #ifdef CONFIG_HIGHMEM
 660                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 661                                 (PAGE_SIZE)),
 662 #endif
 663                         MLM(MODULES_VADDR, MODULES_END),
 664
 665                         MLK_ROUNDUP(__init_begin, __init_end),
 666                         MLK_ROUNDUP(_text, _etext),
 667                         MLK_ROUNDUP(_sdata, _edata),
 668                         MLK_ROUNDUP(__bss_start, __bss_stop));
 669
 670 #undef MLK
 671 #undef MLM
 672 #undef MLK_ROUNDUP
 673
 674         /*
 675          * Check boundaries twice: Some fundamental inconsistencies can
 676          * be detected at build time already.
 677          */
 678 #ifdef CONFIG_MMU
 679         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 680         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 681
 682         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 683         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 684 #endif
 685
 686 #ifdef CONFIG_HIGHMEM
 687         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 688         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 689 #endif
 690
 691         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 692                 extern int sysctl_overcommit_memory;
 693                 /*
 694                  * On a machine this small we won't get
 695                  * anywhere without overcommit, so turn
 696                  * it on by default.
 697                  */
 698                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 699         }
 700 }
 701
 702 void free_initmem(void)
 703 {
 704 #ifdef CONFIG_HAVE_TCM
 705         extern char __tcm_start, __tcm_end;
 706
 707         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 708                                     __phys_to_pfn(__pa(&__tcm_end)),
 709                                     "TCM link");
 710 #endif
 711
 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                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 726                                             __phys_to_pfn(__pa(end)),
 727                                             "initrd");
 728 }
 729
 730 static int __init keepinitrd_setup(char *__unused)
 731 {
 732         keep_initrd = 1;
 733         return 1;
 734 }
 735
 736 __setup("keepinitrd", keepinitrd_setup);
 737 #endif