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/highmem.h>
  19 #include <linux/gfp.h>
  20 #include <linux/memblock.h>
  21 #include <linux/sort.h>
  22
  23 #include <asm/mach-types.h>
  24 #include <asm/sections.h>
  25 #include <asm/setup.h>
  26 #include <asm/sizes.h>
  27 #include <asm/tlb.h>
  28 #include <asm/fixmap.h>
  29
  30 #include <asm/mach/arch.h>
  31 #include <asm/mach/map.h>
  32
  33 #include "mm.h"
  34
  35 static unsigned long phys_initrd_start __initdata = 0;
  36 static unsigned long phys_initrd_size __initdata = 0;
  37
  38 static int __init early_initrd(char *p)
  39 {
  40         unsigned long start, size;
  41         char *endp;
  42
  43         start = memparse(p, &endp);
  44         if (*endp == ',') {
  45                 size = memparse(endp + 1, NULL);
  46
  47                 phys_initrd_start = start;
  48                 phys_initrd_size = size;
  49         }
  50         return 0;
  51 }
  52 early_param("initrd", early_initrd);
  53
  54 static int __init parse_tag_initrd(const struct tag *tag)
  55 {
  56         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
  57                 "please update your bootloader.\n");
  58         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  59         phys_initrd_size = tag->u.initrd.size;
  60         return 0;
  61 }
  62
  63 __tagtable(ATAG_INITRD, parse_tag_initrd);
  64
  65 static int __init parse_tag_initrd2(const struct tag *tag)
  66 {
  67         phys_initrd_start = tag->u.initrd.start;
  68         phys_initrd_size = tag->u.initrd.size;
  69         return 0;
  70 }
  71
  72 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  73
  74 /*
  75  * This keeps memory configuration data used by a couple memory
  76  * initialization functions, as well as show_mem() for the skipping
  77  * of holes in the memory map.  It is populated by arm_add_memory().
  78  */
  79 struct meminfo meminfo;
  80
  81 void show_mem(unsigned int filter)
  82 {
  83         int free = 0, total = 0, reserved = 0;
  84         int shared = 0, cached = 0, slab = 0, i;
  85         struct meminfo * mi = &meminfo;
  86
  87         printk("Mem-info:\n");
  88         show_free_areas(filter);
  89
  90         for_each_bank (i, mi) {
  91                 struct membank *bank = &mi->bank[i];
  92                 unsigned int pfn1, pfn2;
  93                 struct page *page, *end;
  94
  95                 pfn1 = bank_pfn_start(bank);
  96                 pfn2 = bank_pfn_end(bank);
  97
  98                 page = pfn_to_page(pfn1);
  99                 end  = pfn_to_page(pfn2 - 1) + 1;
 100
 101                 do {
 102                         total++;
 103                         if (PageReserved(page))
 104                                 reserved++;
 105                         else if (PageSwapCache(page))
 106                                 cached++;
 107                         else if (PageSlab(page))
 108                                 slab++;
 109                         else if (!page_count(page))
 110                                 free++;
 111                         else
 112                                 shared += page_count(page) - 1;
 113                         page++;
 114                 } while (page < end);
 115         }
 116
 117         printk("%d pages of RAM\n", total);
 118         printk("%d free pages\n", free);
 119         printk("%d reserved pages\n", reserved);
 120         printk("%d slab pages\n", slab);
 121         printk("%d pages shared\n", shared);
 122         printk("%d pages swap cached\n", cached);
 123 }
 124
 125 static void __init find_limits(unsigned long *min, unsigned long *max_low,
 126         unsigned long *max_high)
 127 {
 128         struct meminfo *mi = &meminfo;
 129         int i;
 130
 131         *min = -1UL;
 132         *max_low = *max_high = 0;
 133
 134         for_each_bank (i, mi) {
 135                 struct membank *bank = &mi->bank[i];
 136                 unsigned long start, end;
 137
 138                 start = bank_pfn_start(bank);
 139                 end = bank_pfn_end(bank);
 140
 141                 if (*min > start)
 142                         *min = start;
 143                 if (*max_high < end)
 144                         *max_high = end;
 145                 if (bank->highmem)
 146                         continue;
 147                 if (*max_low < end)
 148                         *max_low = end;
 149         }
 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 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
 206         unsigned long dma_size)
 207 {
 208         if (size[0] <= dma_size)
 209                 return;
 210
 211         size[ZONE_NORMAL] = size[0] - dma_size;
 212         size[ZONE_DMA] = dma_size;
 213         hole[ZONE_NORMAL] = hole[0];
 214         hole[ZONE_DMA] = 0;
 215 }
 216 #endif
 217
 218 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
 219         unsigned long max_high)
 220 {
 221         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 222         struct memblock_region *reg;
 223
 224         /*
 225          * initialise the zones.
 226          */
 227         memset(zone_size, 0, sizeof(zone_size));
 228
 229         /*
 230          * The memory size has already been determined.  If we need
 231          * to do anything fancy with the allocation of this memory
 232          * to the zones, now is the time to do it.
 233          */
 234         zone_size[0] = max_low - min;
 235 #ifdef CONFIG_HIGHMEM
 236         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 237 #endif
 238
 239         /*
 240          * Calculate the size of the holes.
 241          *  holes = node_size - sum(bank_sizes)
 242          */
 243         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 244         for_each_memblock(memory, reg) {
 245                 unsigned long start = memblock_region_memory_base_pfn(reg);
 246                 unsigned long end = memblock_region_memory_end_pfn(reg);
 247
 248                 if (start < max_low) {
 249                         unsigned long low_end = min(end, max_low);
 250                         zhole_size[0] -= low_end - start;
 251                 }
 252 #ifdef CONFIG_HIGHMEM
 253                 if (end > max_low) {
 254                         unsigned long high_start = max(start, max_low);
 255                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
 256                 }
 257 #endif
 258         }
 259
 260 #ifdef ARM_DMA_ZONE_SIZE
 261 #ifndef CONFIG_ZONE_DMA
 262 #error ARM_DMA_ZONE_SIZE set but no DMA zone to limit allocations
 263 #endif
 264
 265         /*
 266          * Adjust the sizes according to any special requirements for
 267          * this machine type.
 268          */
 269         arm_adjust_dma_zone(zone_size, zhole_size,
 270                 ARM_DMA_ZONE_SIZE >> PAGE_SHIFT);
 271 #endif
 272
 273         free_area_init_node(0, zone_size, min, zhole_size);
 274 }
 275
 276 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 277 int pfn_valid(unsigned long pfn)
 278 {
 279         return memblock_is_memory(pfn << PAGE_SHIFT);
 280 }
 281 EXPORT_SYMBOL(pfn_valid);
 282 #endif
 283
 284 #ifndef CONFIG_SPARSEMEM
 285 static void arm_memory_present(void)
 286 {
 287 }
 288 #else
 289 static void arm_memory_present(void)
 290 {
 291         struct memblock_region *reg;
 292
 293         for_each_memblock(memory, reg)
 294                 memory_present(0, memblock_region_memory_base_pfn(reg),
 295                                memblock_region_memory_end_pfn(reg));
 296 }
 297 #endif
 298
 299 static int __init meminfo_cmp(const void *_a, const void *_b)
 300 {
 301         const struct membank *a = _a, *b = _b;
 302         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
 303         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
 304 }
 305
 306 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 307 {
 308         int i;
 309
 310         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
 311
 312         memblock_init();
 313         for (i = 0; i < mi->nr_banks; i++)
 314                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 315
 316         /* Register the kernel text, kernel data and initrd with memblock. */
 317 #ifdef CONFIG_XIP_KERNEL
 318         memblock_reserve(__pa(_sdata), _end - _sdata);
 319 #else
 320         memblock_reserve(__pa(_stext), _end - _stext);
 321 #endif
 322 #ifdef CONFIG_BLK_DEV_INITRD
 323         if (phys_initrd_size &&
 324             memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
 325                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
 326                        phys_initrd_start, phys_initrd_size);
 327                 phys_initrd_start = phys_initrd_size = 0;
 328         }
 329         if (phys_initrd_size) {
 330                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 331
 332                 /* Now convert initrd to virtual addresses */
 333                 initrd_start = __phys_to_virt(phys_initrd_start);
 334                 initrd_end = initrd_start + phys_initrd_size;
 335         }
 336 #endif
 337
 338         arm_mm_memblock_reserve();
 339
 340         /* reserve any platform specific memblock areas */
 341         if (mdesc->reserve)
 342                 mdesc->reserve();
 343
 344         memblock_analyze();
 345         memblock_dump_all();
 346 }
 347
 348 void __init bootmem_init(void)
 349 {
 350         unsigned long min, max_low, max_high;
 351
 352         max_low = max_high = 0;
 353
 354         find_limits(&min, &max_low, &max_high);
 355
 356         arm_bootmem_init(min, max_low);
 357
 358         /*
 359          * Sparsemem tries to allocate bootmem in memory_present(),
 360          * so must be done after the fixed reservations
 361          */
 362         arm_memory_present();
 363
 364         /*
 365          * sparse_init() needs the bootmem allocator up and running.
 366          */
 367         sparse_init();
 368
 369         /*
 370          * Now free the memory - free_area_init_node needs
 371          * the sparse mem_map arrays initialized by sparse_init()
 372          * for memmap_init_zone(), otherwise all PFNs are invalid.
 373          */
 374         arm_bootmem_free(min, max_low, max_high);
 375
 376         high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1;
 377
 378         /*
 379          * This doesn't seem to be used by the Linux memory manager any
 380          * more, but is used by ll_rw_block.  If we can get rid of it, we
 381          * also get rid of some of the stuff above as well.
 382          *
 383          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 384          * the system, not the maximum PFN.
 385          */
 386         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 387         max_pfn = max_high - PHYS_PFN_OFFSET;
 388 }
 389
 390 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 391 {
 392         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 393
 394         for (; pfn < end; pfn++) {
 395                 struct page *page = pfn_to_page(pfn);
 396                 ClearPageReserved(page);
 397                 init_page_count(page);
 398                 __free_page(page);
 399                 pages++;
 400         }
 401
 402         if (size && s)
 403                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 404
 405         return pages;
 406 }
 407
 408 static inline void
 409 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 410 {
 411         struct page *start_pg, *end_pg;
 412         unsigned long pg, pgend;
 413
 414         /*
 415          * Convert start_pfn/end_pfn to a struct page pointer.
 416          */
 417         start_pg = pfn_to_page(start_pfn - 1) + 1;
 418         end_pg = pfn_to_page(end_pfn - 1) + 1;
 419
 420         /*
 421          * Convert to physical addresses, and
 422          * round start upwards and end downwards.
 423          */
 424         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
 425         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
 426
 427         /*
 428          * If there are free pages between these,
 429          * free the section of the memmap array.
 430          */
 431         if (pg < pgend)
 432                 free_bootmem(pg, pgend - pg);
 433 }
 434
 435 /*
 436  * The mem_map array can get very big.  Free the unused area of the memory map.
 437  */
 438 static void __init free_unused_memmap(struct meminfo *mi)
 439 {
 440         unsigned long bank_start, prev_bank_end = 0;
 441         unsigned int i;
 442
 443         /*
 444          * This relies on each bank being in address order.
 445          * The banks are sorted previously in bootmem_init().
 446          */
 447         for_each_bank(i, mi) {
 448                 struct membank *bank = &mi->bank[i];
 449
 450                 bank_start = bank_pfn_start(bank);
 451
 452 #ifdef CONFIG_SPARSEMEM
 453                 /*
 454                  * Take care not to free memmap entries that don't exist
 455                  * due to SPARSEMEM sections which aren't present.
 456                  */
 457                 bank_start = min(bank_start,
 458                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
 459 #endif
 460                 /*
 461                  * If we had a previous bank, and there is a space
 462                  * between the current bank and the previous, free it.
 463                  */
 464                 if (prev_bank_end && prev_bank_end < bank_start)
 465                         free_memmap(prev_bank_end, bank_start);
 466
 467                 /*
 468                  * Align up here since the VM subsystem insists that the
 469                  * memmap entries are valid from the bank end aligned to
 470                  * MAX_ORDER_NR_PAGES.
 471                  */
 472                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 473         }
 474
 475 #ifdef CONFIG_SPARSEMEM
 476         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
 477                 free_memmap(prev_bank_end,
 478                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
 479 #endif
 480 }
 481
 482 static void __init free_highpages(void)
 483 {
 484 #ifdef CONFIG_HIGHMEM
 485         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
 486         struct memblock_region *mem, *res;
 487
 488         /* set highmem page free */
 489         for_each_memblock(memory, mem) {
 490                 unsigned long start = memblock_region_memory_base_pfn(mem);
 491                 unsigned long end = memblock_region_memory_end_pfn(mem);
 492
 493                 /* Ignore complete lowmem entries */
 494                 if (end <= max_low)
 495                         continue;
 496
 497                 /* Truncate partial highmem entries */
 498                 if (start < max_low)
 499                         start = max_low;
 500
 501                 /* Find and exclude any reserved regions */
 502                 for_each_memblock(reserved, res) {
 503                         unsigned long res_start, res_end;
 504
 505                         res_start = memblock_region_reserved_base_pfn(res);
 506                         res_end = memblock_region_reserved_end_pfn(res);
 507
 508                         if (res_end < start)
 509                                 continue;
 510                         if (res_start < start)
 511                                 res_start = start;
 512                         if (res_start > end)
 513                                 res_start = end;
 514                         if (res_end > end)
 515                                 res_end = end;
 516                         if (res_start != start)
 517                                 totalhigh_pages += free_area(start, res_start,
 518                                                              NULL);
 519                         start = res_end;
 520                         if (start == end)
 521                                 break;
 522                 }
 523
 524                 /* And now free anything which remains */
 525                 if (start < end)
 526                         totalhigh_pages += free_area(start, end, NULL);
 527         }
 528         totalram_pages += totalhigh_pages;
 529 #endif
 530 }
 531
 532 /*
 533  * mem_init() marks the free areas in the mem_map and tells us how much
 534  * memory is free.  This is done after various parts of the system have
 535  * claimed their memory after the kernel image.
 536  */
 537 void __init mem_init(void)
 538 {
 539         unsigned long reserved_pages, free_pages;
 540         struct memblock_region *reg;
 541         int i;
 542 #ifdef CONFIG_HAVE_TCM
 543         /* These pointers are filled in on TCM detection */
 544         extern u32 dtcm_end;
 545         extern u32 itcm_end;
 546 #endif
 547
 548         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 549
 550         /* this will put all unused low memory onto the freelists */
 551         free_unused_memmap(&meminfo);
 552
 553         totalram_pages += free_all_bootmem();
 554
 555 #ifdef CONFIG_SA1111
 556         /* now that our DMA memory is actually so designated, we can free it */
 557         totalram_pages += free_area(PHYS_PFN_OFFSET,
 558                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 559 #endif
 560
 561         free_highpages();
 562
 563         reserved_pages = free_pages = 0;
 564
 565         for_each_bank(i, &meminfo) {
 566                 struct membank *bank = &meminfo.bank[i];
 567                 unsigned int pfn1, pfn2;
 568                 struct page *page, *end;
 569
 570                 pfn1 = bank_pfn_start(bank);
 571                 pfn2 = bank_pfn_end(bank);
 572
 573                 page = pfn_to_page(pfn1);
 574                 end  = pfn_to_page(pfn2 - 1) + 1;
 575
 576                 do {
 577                         if (PageReserved(page))
 578                                 reserved_pages++;
 579                         else if (!page_count(page))
 580                                 free_pages++;
 581                         page++;
 582                 } while (page < end);
 583         }
 584
 585         /*
 586          * Since our memory may not be contiguous, calculate the
 587          * real number of pages we have in this system
 588          */
 589         printk(KERN_INFO "Memory:");
 590         num_physpages = 0;
 591         for_each_memblock(memory, reg) {
 592                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 593                         memblock_region_memory_base_pfn(reg);
 594                 num_physpages += pages;
 595                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 596         }
 597         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 598
 599         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 600                 nr_free_pages() << (PAGE_SHIFT-10),
 601                 free_pages << (PAGE_SHIFT-10),
 602                 reserved_pages << (PAGE_SHIFT-10),
 603                 totalhigh_pages << (PAGE_SHIFT-10));
 604
 605 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 606 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 607 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 608
 609         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 610                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 611 #ifdef CONFIG_HAVE_TCM
 612                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 613                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 614 #endif
 615                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 616 #ifdef CONFIG_MMU
 617                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 618 #endif
 619                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 620                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 621 #ifdef CONFIG_HIGHMEM
 622                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 623 #endif
 624                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 625                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 626                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 627                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 628
 629                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 630                                 (PAGE_SIZE)),
 631 #ifdef CONFIG_HAVE_TCM
 632                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 633                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 634 #endif
 635                         MLK(FIXADDR_START, FIXADDR_TOP),
 636 #ifdef CONFIG_MMU
 637                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 638 #endif
 639                         MLM(VMALLOC_START, VMALLOC_END),
 640                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 641 #ifdef CONFIG_HIGHMEM
 642                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 643                                 (PAGE_SIZE)),
 644 #endif
 645                         MLM(MODULES_VADDR, MODULES_END),
 646
 647                         MLK_ROUNDUP(__init_begin, __init_end),
 648                         MLK_ROUNDUP(_text, _etext),
 649                         MLK_ROUNDUP(_sdata, _edata));
 650
 651 #undef MLK
 652 #undef MLM
 653 #undef MLK_ROUNDUP
 654
 655         /*
 656          * Check boundaries twice: Some fundamental inconsistencies can
 657          * be detected at build time already.
 658          */
 659 #ifdef CONFIG_MMU
 660         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 661         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 662
 663         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 664         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 665 #endif
 666
 667 #ifdef CONFIG_HIGHMEM
 668         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 669         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 670 #endif
 671
 672         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 673                 extern int sysctl_overcommit_memory;
 674                 /*
 675                  * On a machine this small we won't get
 676                  * anywhere without overcommit, so turn
 677                  * it on by default.
 678                  */
 679                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 680         }
 681 }
 682
 683 void free_initmem(void)
 684 {
 685 #ifdef CONFIG_HAVE_TCM
 686         extern char __tcm_start, __tcm_end;
 687
 688         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 689                                     __phys_to_pfn(__pa(&__tcm_end)),
 690                                     "TCM link");
 691 #endif
 692
 693         if (!machine_is_integrator() && !machine_is_cintegrator())
 694                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 695                                             __phys_to_pfn(__pa(__init_end)),
 696                                             "init");
 697 }
 698
 699 #ifdef CONFIG_BLK_DEV_INITRD
 700
 701 static int keep_initrd;
 702
 703 void free_initrd_mem(unsigned long start, unsigned long end)
 704 {
 705         if (!keep_initrd)
 706                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 707                                             __phys_to_pfn(__pa(end)),
 708                                             "initrd");
 709 }
 710
 711 static int __init keepinitrd_setup(char *__unused)
 712 {
 713         keep_initrd = 1;
 714         return 1;
 715 }
 716
 717 __setup("keepinitrd", keepinitrd_setup);
 718 #endif