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(void)
  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();
  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(struct meminfo *mi,
 126         unsigned long *min, unsigned long *max_low, unsigned long *max_high)
 127 {
 128         int i;
 129
 130         *min = -1UL;
 131         *max_low = *max_high = 0;
 132
 133         for_each_bank (i, mi) {
 134                 struct membank *bank = &mi->bank[i];
 135                 unsigned long start, end;
 136
 137                 start = bank_pfn_start(bank);
 138                 end = bank_pfn_end(bank);
 139
 140                 if (*min > start)
 141                         *min = start;
 142                 if (*max_high < end)
 143                         *max_high = end;
 144                 if (bank->highmem)
 145                         continue;
 146                 if (*max_low < end)
 147                         *max_low = end;
 148         }
 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 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
 204         unsigned long max_high)
 205 {
 206         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 207         struct memblock_region *reg;
 208
 209         /*
 210          * initialise the zones.
 211          */
 212         memset(zone_size, 0, sizeof(zone_size));
 213
 214         /*
 215          * The memory size has already been determined.  If we need
 216          * to do anything fancy with the allocation of this memory
 217          * to the zones, now is the time to do it.
 218          */
 219         zone_size[0] = max_low - min;
 220 #ifdef CONFIG_HIGHMEM
 221         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 222 #endif
 223
 224         /*
 225          * Calculate the size of the holes.
 226          *  holes = node_size - sum(bank_sizes)
 227          */
 228         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 229         for_each_memblock(memory, reg) {
 230                 unsigned long start = memblock_region_memory_base_pfn(reg);
 231                 unsigned long end = memblock_region_memory_end_pfn(reg);
 232
 233                 if (start < max_low) {
 234                         unsigned long low_end = min(end, max_low);
 235                         zhole_size[0] -= low_end - start;
 236                 }
 237 #ifdef CONFIG_HIGHMEM
 238                 if (end > max_low) {
 239                         unsigned long high_start = max(start, max_low);
 240                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
 241                 }
 242 #endif
 243         }
 244
 245         /*
 246          * Adjust the sizes according to any special requirements for
 247          * this machine type.
 248          */
 249         arch_adjust_zones(zone_size, zhole_size);
 250
 251         free_area_init_node(0, zone_size, min, zhole_size);
 252 }
 253
 254 #ifndef CONFIG_SPARSEMEM
 255 int pfn_valid(unsigned long pfn)
 256 {
 257         return memblock_is_memory(pfn << PAGE_SHIFT);
 258 }
 259 EXPORT_SYMBOL(pfn_valid);
 260
 261 static void arm_memory_present(void)
 262 {
 263 }
 264 #else
 265 static void arm_memory_present(void)
 266 {
 267         struct memblock_region *reg;
 268
 269         for_each_memblock(memory, reg)
 270                 memory_present(0, memblock_region_memory_base_pfn(reg),
 271                                memblock_region_memory_end_pfn(reg));
 272 }
 273 #endif
 274
 275 static int __init meminfo_cmp(const void *_a, const void *_b)
 276 {
 277         const struct membank *a = _a, *b = _b;
 278         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
 279         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
 280 }
 281
 282 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 283 {
 284         int i;
 285
 286         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
 287
 288         memblock_init();
 289         for (i = 0; i < mi->nr_banks; i++)
 290                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 291
 292         /* Register the kernel text, kernel data and initrd with memblock. */
 293 #ifdef CONFIG_XIP_KERNEL
 294         memblock_reserve(__pa(_sdata), _end - _sdata);
 295 #else
 296         memblock_reserve(__pa(_stext), _end - _stext);
 297 #endif
 298 #ifdef CONFIG_BLK_DEV_INITRD
 299         if (phys_initrd_size) {
 300                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 301
 302                 /* Now convert initrd to virtual addresses */
 303                 initrd_start = __phys_to_virt(phys_initrd_start);
 304                 initrd_end = initrd_start + phys_initrd_size;
 305         }
 306 #endif
 307
 308         arm_mm_memblock_reserve();
 309
 310         /* reserve any platform specific memblock areas */
 311         if (mdesc->reserve)
 312                 mdesc->reserve();
 313
 314         memblock_analyze();
 315         memblock_dump_all();
 316 }
 317
 318 void __init bootmem_init(void)
 319 {
 320         struct meminfo *mi = &meminfo;
 321         unsigned long min, max_low, max_high;
 322
 323         max_low = max_high = 0;
 324
 325         find_limits(mi, &min, &max_low, &max_high);
 326
 327         arm_bootmem_init(min, max_low);
 328
 329         /*
 330          * Sparsemem tries to allocate bootmem in memory_present(),
 331          * so must be done after the fixed reservations
 332          */
 333         arm_memory_present();
 334
 335         /*
 336          * sparse_init() needs the bootmem allocator up and running.
 337          */
 338         sparse_init();
 339
 340         /*
 341          * Now free the memory - free_area_init_node needs
 342          * the sparse mem_map arrays initialized by sparse_init()
 343          * for memmap_init_zone(), otherwise all PFNs are invalid.
 344          */
 345         arm_bootmem_free(min, max_low, max_high);
 346
 347         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
 348
 349         /*
 350          * This doesn't seem to be used by the Linux memory manager any
 351          * more, but is used by ll_rw_block.  If we can get rid of it, we
 352          * also get rid of some of the stuff above as well.
 353          *
 354          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 355          * the system, not the maximum PFN.
 356          */
 357         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 358         max_pfn = max_high - PHYS_PFN_OFFSET;
 359 }
 360
 361 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 362 {
 363         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 364
 365         for (; pfn < end; pfn++) {
 366                 struct page *page = pfn_to_page(pfn);
 367                 ClearPageReserved(page);
 368                 init_page_count(page);
 369                 __free_page(page);
 370                 pages++;
 371         }
 372
 373         if (size && s)
 374                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 375
 376         return pages;
 377 }
 378
 379 static inline void
 380 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 381 {
 382         struct page *start_pg, *end_pg;
 383         unsigned long pg, pgend;
 384
 385         /*
 386          * Convert start_pfn/end_pfn to a struct page pointer.
 387          */
 388         start_pg = pfn_to_page(start_pfn - 1) + 1;
 389         end_pg = pfn_to_page(end_pfn);
 390
 391         /*
 392          * Convert to physical addresses, and
 393          * round start upwards and end downwards.
 394          */
 395         pg = PAGE_ALIGN(__pa(start_pg));
 396         pgend = __pa(end_pg) & PAGE_MASK;
 397
 398         /*
 399          * If there are free pages between these,
 400          * free the section of the memmap array.
 401          */
 402         if (pg < pgend)
 403                 free_bootmem(pg, pgend - pg);
 404 }
 405
 406 /*
 407  * The mem_map array can get very big.  Free the unused area of the memory map.
 408  */
 409 static void __init free_unused_memmap(struct meminfo *mi)
 410 {
 411         unsigned long bank_start, prev_bank_end = 0;
 412         unsigned int i;
 413
 414         /*
 415          * This relies on each bank being in address order.
 416          * The banks are sorted previously in bootmem_init().
 417          */
 418         for_each_bank(i, mi) {
 419                 struct membank *bank = &mi->bank[i];
 420
 421                 bank_start = bank_pfn_start(bank);
 422
 423                 /*
 424                  * If we had a previous bank, and there is a space
 425                  * between the current bank and the previous, free it.
 426                  */
 427                 if (prev_bank_end && prev_bank_end < bank_start)
 428                         free_memmap(prev_bank_end, bank_start);
 429
 430                 /*
 431                  * Align up here since the VM subsystem insists that the
 432                  * memmap entries are valid from the bank end aligned to
 433                  * MAX_ORDER_NR_PAGES.
 434                  */
 435                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 436         }
 437 }
 438
 439 /*
 440  * mem_init() marks the free areas in the mem_map and tells us how much
 441  * memory is free.  This is done after various parts of the system have
 442  * claimed their memory after the kernel image.
 443  */
 444 void __init mem_init(void)
 445 {
 446         unsigned long reserved_pages, free_pages;
 447         int i;
 448 #ifdef CONFIG_HAVE_TCM
 449         /* These pointers are filled in on TCM detection */
 450         extern u32 dtcm_end;
 451         extern u32 itcm_end;
 452 #endif
 453
 454         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 455
 456         /* this will put all unused low memory onto the freelists */
 457         free_unused_memmap(&meminfo);
 458
 459         totalram_pages += free_all_bootmem();
 460
 461 #ifdef CONFIG_SA1111
 462         /* now that our DMA memory is actually so designated, we can free it */
 463         totalram_pages += free_area(PHYS_PFN_OFFSET,
 464                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 465 #endif
 466
 467 #ifdef CONFIG_HIGHMEM
 468         /* set highmem page free */
 469         for_each_bank (i, &meminfo) {
 470                 unsigned long start = bank_pfn_start(&meminfo.bank[i]);
 471                 unsigned long end = bank_pfn_end(&meminfo.bank[i]);
 472                 if (start >= max_low_pfn + PHYS_PFN_OFFSET)
 473                         totalhigh_pages += free_area(start, end, NULL);
 474         }
 475         totalram_pages += totalhigh_pages;
 476 #endif
 477
 478         reserved_pages = free_pages = 0;
 479
 480         for_each_bank(i, &meminfo) {
 481                 struct membank *bank = &meminfo.bank[i];
 482                 unsigned int pfn1, pfn2;
 483                 struct page *page, *end;
 484
 485                 pfn1 = bank_pfn_start(bank);
 486                 pfn2 = bank_pfn_end(bank);
 487
 488                 page = pfn_to_page(pfn1);
 489                 end  = pfn_to_page(pfn2 - 1) + 1;
 490
 491                 do {
 492                         if (PageReserved(page))
 493                                 reserved_pages++;
 494                         else if (!page_count(page))
 495                                 free_pages++;
 496                         page++;
 497                 } while (page < end);
 498         }
 499
 500         /*
 501          * Since our memory may not be contiguous, calculate the
 502          * real number of pages we have in this system
 503          */
 504         printk(KERN_INFO "Memory:");
 505         num_physpages = 0;
 506         for (i = 0; i < meminfo.nr_banks; i++) {
 507                 num_physpages += bank_pfn_size(&meminfo.bank[i]);
 508                 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
 509         }
 510         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 511
 512         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 513                 nr_free_pages() << (PAGE_SHIFT-10),
 514                 free_pages << (PAGE_SHIFT-10),
 515                 reserved_pages << (PAGE_SHIFT-10),
 516                 totalhigh_pages << (PAGE_SHIFT-10));
 517
 518 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 519 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 520 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 521
 522         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 523                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 524 #ifdef CONFIG_HAVE_TCM
 525                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 526                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 527 #endif
 528                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 529 #ifdef CONFIG_MMU
 530                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 531 #endif
 532                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 533                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 534 #ifdef CONFIG_HIGHMEM
 535                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 536 #endif
 537                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 538                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 539                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 540                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 541
 542                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 543                                 (PAGE_SIZE)),
 544 #ifdef CONFIG_HAVE_TCM
 545                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 546                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 547 #endif
 548                         MLK(FIXADDR_START, FIXADDR_TOP),
 549 #ifdef CONFIG_MMU
 550                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 551 #endif
 552                         MLM(VMALLOC_START, VMALLOC_END),
 553                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 554 #ifdef CONFIG_HIGHMEM
 555                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 556                                 (PAGE_SIZE)),
 557 #endif
 558                         MLM(MODULES_VADDR, MODULES_END),
 559
 560                         MLK_ROUNDUP(__init_begin, __init_end),
 561                         MLK_ROUNDUP(_text, _etext),
 562                         MLK_ROUNDUP(_sdata, _edata));
 563
 564 #undef MLK
 565 #undef MLM
 566 #undef MLK_ROUNDUP
 567
 568         /*
 569          * Check boundaries twice: Some fundamental inconsistencies can
 570          * be detected at build time already.
 571          */
 572 #ifdef CONFIG_MMU
 573         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 574         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 575
 576         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 577         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 578 #endif
 579
 580 #ifdef CONFIG_HIGHMEM
 581         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 582         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 583 #endif
 584
 585         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 586                 extern int sysctl_overcommit_memory;
 587                 /*
 588                  * On a machine this small we won't get
 589                  * anywhere without overcommit, so turn
 590                  * it on by default.
 591                  */
 592                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 593         }
 594 }
 595
 596 void free_initmem(void)
 597 {
 598 #ifdef CONFIG_HAVE_TCM
 599         extern char __tcm_start, __tcm_end;
 600
 601         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 602                                     __phys_to_pfn(__pa(&__tcm_end)),
 603                                     "TCM link");
 604 #endif
 605
 606         if (!machine_is_integrator() && !machine_is_cintegrator())
 607                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 608                                             __phys_to_pfn(__pa(__init_end)),
 609                                             "init");
 610 }
 611
 612 #ifdef CONFIG_BLK_DEV_INITRD
 613
 614 static int keep_initrd;
 615
 616 void free_initrd_mem(unsigned long start, unsigned long end)
 617 {
 618         if (!keep_initrd)
 619                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 620                                             __phys_to_pfn(__pa(end)),
 621                                             "initrd");
 622 }
 623
 624 static int __init keepinitrd_setup(char *__unused)
 625 {
 626         keep_initrd = 1;
 627         return 1;
 628 }
 629
 630 __setup("keepinitrd", keepinitrd_setup);
 631 #endif