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
  22 #include <asm/mach-types.h>
  23 #include <asm/sections.h>
  24 #include <asm/setup.h>
  25 #include <asm/sizes.h>
  26 #include <asm/tlb.h>
  27 #include <asm/fixmap.h>
  28
  29 #include <asm/mach/arch.h>
  30 #include <asm/mach/map.h>
  31
  32 #include "mm.h"
  33
  34 static unsigned long phys_initrd_start __initdata = 0;
  35 static unsigned long phys_initrd_size __initdata = 0;
  36
  37 static int __init early_initrd(char *p)
  38 {
  39         unsigned long start, size;
  40         char *endp;
  41
  42         start = memparse(p, &endp);
  43         if (*endp == ',') {
  44                 size = memparse(endp + 1, NULL);
  45
  46                 phys_initrd_start = start;
  47                 phys_initrd_size = size;
  48         }
  49         return 0;
  50 }
  51 early_param("initrd", early_initrd);
  52
  53 static int __init parse_tag_initrd(const struct tag *tag)
  54 {
  55         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
  56                 "please update your bootloader.\n");
  57         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  58         phys_initrd_size = tag->u.initrd.size;
  59         return 0;
  60 }
  61
  62 __tagtable(ATAG_INITRD, parse_tag_initrd);
  63
  64 static int __init parse_tag_initrd2(const struct tag *tag)
  65 {
  66         phys_initrd_start = tag->u.initrd.start;
  67         phys_initrd_size = tag->u.initrd.size;
  68         return 0;
  69 }
  70
  71 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  72
  73 /*
  74  * This keeps memory configuration data used by a couple memory
  75  * initialization functions, as well as show_mem() for the skipping
  76  * of holes in the memory map.  It is populated by arm_add_memory().
  77  */
  78 struct meminfo meminfo;
  79
  80 void show_mem(void)
  81 {
  82         int free = 0, total = 0, reserved = 0;
  83         int shared = 0, cached = 0, slab = 0, i;
  84         struct meminfo * mi = &meminfo;
  85
  86         printk("Mem-info:\n");
  87         show_free_areas();
  88
  89         for_each_bank (i, mi) {
  90                 struct membank *bank = &mi->bank[i];
  91                 unsigned int pfn1, pfn2;
  92                 struct page *page, *end;
  93
  94                 pfn1 = bank_pfn_start(bank);
  95                 pfn2 = bank_pfn_end(bank);
  96
  97                 page = pfn_to_page(pfn1);
  98                 end  = pfn_to_page(pfn2 - 1) + 1;
  99
 100                 do {
 101                         total++;
 102                         if (PageReserved(page))
 103                                 reserved++;
 104                         else if (PageSwapCache(page))
 105                                 cached++;
 106                         else if (PageSlab(page))
 107                                 slab++;
 108                         else if (!page_count(page))
 109                                 free++;
 110                         else
 111                                 shared += page_count(page) - 1;
 112                         page++;
 113                 } while (page < end);
 114         }
 115
 116         printk("%d pages of RAM\n", total);
 117         printk("%d free pages\n", free);
 118         printk("%d reserved pages\n", reserved);
 119         printk("%d slab pages\n", slab);
 120         printk("%d pages shared\n", shared);
 121         printk("%d pages swap cached\n", cached);
 122 }
 123
 124 static void __init find_limits(struct meminfo *mi,
 125         unsigned long *min, unsigned long *max_low, unsigned long *max_high)
 126 {
 127         int i;
 128
 129         *min = -1UL;
 130         *max_low = *max_high = 0;
 131
 132         for_each_bank (i, mi) {
 133                 struct membank *bank = &mi->bank[i];
 134                 unsigned long start, end;
 135
 136                 start = bank_pfn_start(bank);
 137                 end = bank_pfn_end(bank);
 138
 139                 if (*min > start)
 140                         *min = start;
 141                 if (*max_high < end)
 142                         *max_high = end;
 143                 if (bank->highmem)
 144                         continue;
 145                 if (*max_low < end)
 146                         *max_low = end;
 147         }
 148 }
 149
 150 static void __init arm_bootmem_init(struct meminfo *mi,
 151         unsigned long start_pfn, unsigned long end_pfn)
 152 {
 153         unsigned int boot_pages;
 154         phys_addr_t bitmap;
 155         pg_data_t *pgdat;
 156         int i;
 157
 158         /*
 159          * Allocate the bootmem bitmap page.  This must be in a region
 160          * of memory which has already been mapped.
 161          */
 162         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 163         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
 164                                 __pfn_to_phys(end_pfn));
 165
 166         /*
 167          * Initialise the bootmem allocator, handing the
 168          * memory banks over to bootmem.
 169          */
 170         node_set_online(0);
 171         pgdat = NODE_DATA(0);
 172         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 173
 174         for_each_bank(i, mi) {
 175                 struct membank *bank = &mi->bank[i];
 176                 if (!bank->highmem)
 177                         free_bootmem(bank_phys_start(bank), bank_phys_size(bank));
 178         }
 179
 180         /*
 181          * Reserve the memblock reserved regions in bootmem.
 182          */
 183         for (i = 0; i < memblock.reserved.cnt; i++) {
 184                 phys_addr_t start = memblock_start_pfn(&memblock.reserved, i);
 185                 if (start >= start_pfn &&
 186                     memblock_end_pfn(&memblock.reserved, i) <= end_pfn)
 187                         reserve_bootmem_node(pgdat, __pfn_to_phys(start),
 188                                 memblock_size_bytes(&memblock.reserved, i),
 189                                 BOOTMEM_DEFAULT);
 190         }
 191 }
 192
 193 static void __init arm_bootmem_free(struct meminfo *mi)
 194 {
 195         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 196         unsigned long min, max_low, max_high;
 197         int i;
 198
 199         find_limits(mi, &min, &max_low, &max_high);
 200
 201         /*
 202          * initialise the zones.
 203          */
 204         memset(zone_size, 0, sizeof(zone_size));
 205
 206         /*
 207          * The memory size has already been determined.  If we need
 208          * to do anything fancy with the allocation of this memory
 209          * to the zones, now is the time to do it.
 210          */
 211         zone_size[0] = max_low - min;
 212 #ifdef CONFIG_HIGHMEM
 213         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 214 #endif
 215
 216         /*
 217          * Calculate the size of the holes.
 218          *  holes = node_size - sum(bank_sizes)
 219          */
 220         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 221         for_each_bank(i, mi) {
 222                 int idx = 0;
 223 #ifdef CONFIG_HIGHMEM
 224                 if (mi->bank[i].highmem)
 225                         idx = ZONE_HIGHMEM;
 226 #endif
 227                 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
 228         }
 229
 230         /*
 231          * Adjust the sizes according to any special requirements for
 232          * this machine type.
 233          */
 234         arch_adjust_zones(zone_size, zhole_size);
 235
 236         free_area_init_node(0, zone_size, min, zhole_size);
 237 }
 238
 239 #ifndef CONFIG_SPARSEMEM
 240 int pfn_valid(unsigned long pfn)
 241 {
 242         struct meminfo *mi = &meminfo;
 243         unsigned int left = 0, right = mi->nr_banks;
 244
 245         do {
 246                 unsigned int mid = (right + left) / 2;
 247                 struct membank *bank = &mi->bank[mid];
 248
 249                 if (pfn < bank_pfn_start(bank))
 250                         right = mid;
 251                 else if (pfn >= bank_pfn_end(bank))
 252                         left = mid + 1;
 253                 else
 254                         return 1;
 255         } while (left < right);
 256         return 0;
 257 }
 258 EXPORT_SYMBOL(pfn_valid);
 259
 260 static void arm_memory_present(void)
 261 {
 262 }
 263 #else
 264 static void arm_memory_present(void)
 265 {
 266         int i;
 267         for (i = 0; i < memblock.memory.cnt; i++)
 268                 memory_present(0, memblock_start_pfn(&memblock.memory, i),
 269                                   memblock_end_pfn(&memblock.memory, i));
 270 }
 271 #endif
 272
 273 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 274 {
 275         int i;
 276
 277         memblock_init();
 278         for (i = 0; i < mi->nr_banks; i++)
 279                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 280
 281         /* Register the kernel text, kernel data and initrd with memblock. */
 282 #ifdef CONFIG_XIP_KERNEL
 283         memblock_reserve(__pa(_data), _end - _data);
 284 #else
 285         memblock_reserve(__pa(_stext), _end - _stext);
 286 #endif
 287 #ifdef CONFIG_BLK_DEV_INITRD
 288         if (phys_initrd_size) {
 289                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 290
 291                 /* Now convert initrd to virtual addresses */
 292                 initrd_start = __phys_to_virt(phys_initrd_start);
 293                 initrd_end = initrd_start + phys_initrd_size;
 294         }
 295 #endif
 296
 297         arm_mm_memblock_reserve();
 298
 299         /* reserve any platform specific memblock areas */
 300         if (mdesc->reserve)
 301                 mdesc->reserve();
 302
 303         memblock_analyze();
 304         memblock_dump_all();
 305 }
 306
 307 void __init bootmem_init(void)
 308 {
 309         struct meminfo *mi = &meminfo;
 310         unsigned long min, max_low, max_high;
 311
 312         max_low = max_high = 0;
 313
 314         find_limits(mi, &min, &max_low, &max_high);
 315
 316         arm_bootmem_init(mi, min, max_low);
 317
 318         /*
 319          * Sparsemem tries to allocate bootmem in memory_present(),
 320          * so must be done after the fixed reservations
 321          */
 322         arm_memory_present();
 323
 324         /*
 325          * sparse_init() needs the bootmem allocator up and running.
 326          */
 327         sparse_init();
 328
 329         /*
 330          * Now free the memory - free_area_init_node needs
 331          * the sparse mem_map arrays initialized by sparse_init()
 332          * for memmap_init_zone(), otherwise all PFNs are invalid.
 333          */
 334         arm_bootmem_free(mi);
 335
 336         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
 337
 338         /*
 339          * This doesn't seem to be used by the Linux memory manager any
 340          * more, but is used by ll_rw_block.  If we can get rid of it, we
 341          * also get rid of some of the stuff above as well.
 342          *
 343          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 344          * the system, not the maximum PFN.
 345          */
 346         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 347         max_pfn = max_high - PHYS_PFN_OFFSET;
 348 }
 349
 350 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 351 {
 352         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 353
 354         for (; pfn < end; pfn++) {
 355                 struct page *page = pfn_to_page(pfn);
 356                 ClearPageReserved(page);
 357                 init_page_count(page);
 358                 __free_page(page);
 359                 pages++;
 360         }
 361
 362         if (size && s)
 363                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 364
 365         return pages;
 366 }
 367
 368 static inline void
 369 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 370 {
 371         struct page *start_pg, *end_pg;
 372         unsigned long pg, pgend;
 373
 374         /*
 375          * Convert start_pfn/end_pfn to a struct page pointer.
 376          */
 377         start_pg = pfn_to_page(start_pfn - 1) + 1;
 378         end_pg = pfn_to_page(end_pfn);
 379
 380         /*
 381          * Convert to physical addresses, and
 382          * round start upwards and end downwards.
 383          */
 384         pg = PAGE_ALIGN(__pa(start_pg));
 385         pgend = __pa(end_pg) & PAGE_MASK;
 386
 387         /*
 388          * If there are free pages between these,
 389          * free the section of the memmap array.
 390          */
 391         if (pg < pgend)
 392                 free_bootmem(pg, pgend - pg);
 393 }
 394
 395 /*
 396  * The mem_map array can get very big.  Free the unused area of the memory map.
 397  */
 398 static void __init free_unused_memmap(struct meminfo *mi)
 399 {
 400         unsigned long bank_start, prev_bank_end = 0;
 401         unsigned int i;
 402
 403         /*
 404          * [FIXME] This relies on each bank being in address order.  This
 405          * may not be the case, especially if the user has provided the
 406          * information on the command line.
 407          */
 408         for_each_bank(i, mi) {
 409                 struct membank *bank = &mi->bank[i];
 410
 411                 bank_start = bank_pfn_start(bank);
 412                 if (bank_start < prev_bank_end) {
 413                         printk(KERN_ERR "MEM: unordered memory banks.  "
 414                                 "Not freeing memmap.\n");
 415                         break;
 416                 }
 417
 418                 /*
 419                  * If we had a previous bank, and there is a space
 420                  * between the current bank and the previous, free it.
 421                  */
 422                 if (prev_bank_end && prev_bank_end != bank_start)
 423                         free_memmap(prev_bank_end, bank_start);
 424
 425                 prev_bank_end = bank_pfn_end(bank);
 426         }
 427 }
 428
 429 /*
 430  * mem_init() marks the free areas in the mem_map and tells us how much
 431  * memory is free.  This is done after various parts of the system have
 432  * claimed their memory after the kernel image.
 433  */
 434 void __init mem_init(void)
 435 {
 436         unsigned long reserved_pages, free_pages;
 437         int i;
 438
 439         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 440
 441         /* this will put all unused low memory onto the freelists */
 442         free_unused_memmap(&meminfo);
 443
 444         totalram_pages += free_all_bootmem();
 445
 446 #ifdef CONFIG_SA1111
 447         /* now that our DMA memory is actually so designated, we can free it */
 448         totalram_pages += free_area(PHYS_PFN_OFFSET,
 449                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 450 #endif
 451
 452 #ifdef CONFIG_HIGHMEM
 453         /* set highmem page free */
 454         for_each_bank (i, &meminfo) {
 455                 unsigned long start = bank_pfn_start(&meminfo.bank[i]);
 456                 unsigned long end = bank_pfn_end(&meminfo.bank[i]);
 457                 if (start >= max_low_pfn + PHYS_PFN_OFFSET)
 458                         totalhigh_pages += free_area(start, end, NULL);
 459         }
 460         totalram_pages += totalhigh_pages;
 461 #endif
 462
 463         reserved_pages = free_pages = 0;
 464
 465         for_each_bank(i, &meminfo) {
 466                 struct membank *bank = &meminfo.bank[i];
 467                 unsigned int pfn1, pfn2;
 468                 struct page *page, *end;
 469
 470                 pfn1 = bank_pfn_start(bank);
 471                 pfn2 = bank_pfn_end(bank);
 472
 473                 page = pfn_to_page(pfn1);
 474                 end  = pfn_to_page(pfn2 - 1) + 1;
 475
 476                 do {
 477                         if (PageReserved(page))
 478                                 reserved_pages++;
 479                         else if (!page_count(page))
 480                                 free_pages++;
 481                         page++;
 482                 } while (page < end);
 483         }
 484
 485         /*
 486          * Since our memory may not be contiguous, calculate the
 487          * real number of pages we have in this system
 488          */
 489         printk(KERN_INFO "Memory:");
 490         num_physpages = 0;
 491         for (i = 0; i < meminfo.nr_banks; i++) {
 492                 num_physpages += bank_pfn_size(&meminfo.bank[i]);
 493                 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
 494         }
 495         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 496
 497         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 498                 nr_free_pages() << (PAGE_SHIFT-10),
 499                 free_pages << (PAGE_SHIFT-10),
 500                 reserved_pages << (PAGE_SHIFT-10),
 501                 totalhigh_pages << (PAGE_SHIFT-10));
 502
 503 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 504 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 505 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 506
 507         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 508                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 509                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 510 #ifdef CONFIG_MMU
 511                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 512 #endif
 513                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 514                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 515 #ifdef CONFIG_HIGHMEM
 516                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 517 #endif
 518                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 519                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 520                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 521                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 522
 523                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 524                                 (PAGE_SIZE)),
 525                         MLK(FIXADDR_START, FIXADDR_TOP),
 526 #ifdef CONFIG_MMU
 527                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 528 #endif
 529                         MLM(VMALLOC_START, VMALLOC_END),
 530                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 531 #ifdef CONFIG_HIGHMEM
 532                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 533                                 (PAGE_SIZE)),
 534 #endif
 535                         MLM(MODULES_VADDR, MODULES_END),
 536
 537                         MLK_ROUNDUP(__init_begin, __init_end),
 538                         MLK_ROUNDUP(_text, _etext),
 539                         MLK_ROUNDUP(_data, _edata));
 540
 541 #undef MLK
 542 #undef MLM
 543 #undef MLK_ROUNDUP
 544
 545         /*
 546          * Check boundaries twice: Some fundamental inconsistencies can
 547          * be detected at build time already.
 548          */
 549 #ifdef CONFIG_MMU
 550         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 551         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 552
 553         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 554         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 555 #endif
 556
 557 #ifdef CONFIG_HIGHMEM
 558         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 559         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 560 #endif
 561
 562         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 563                 extern int sysctl_overcommit_memory;
 564                 /*
 565                  * On a machine this small we won't get
 566                  * anywhere without overcommit, so turn
 567                  * it on by default.
 568                  */
 569                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 570         }
 571 }
 572
 573 void free_initmem(void)
 574 {
 575 #ifdef CONFIG_HAVE_TCM
 576         extern char __tcm_start, __tcm_end;
 577
 578         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 579                                     __phys_to_pfn(__pa(&__tcm_end)),
 580                                     "TCM link");
 581 #endif
 582
 583         if (!machine_is_integrator() && !machine_is_cintegrator())
 584                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 585                                             __phys_to_pfn(__pa(__init_end)),
 586                                             "init");
 587 }
 588
 589 #ifdef CONFIG_BLK_DEV_INITRD
 590
 591 static int keep_initrd;
 592
 593 void free_initrd_mem(unsigned long start, unsigned long end)
 594 {
 595         if (!keep_initrd)
 596                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 597                                             __phys_to_pfn(__pa(end)),
 598                                             "initrd");
 599 }
 600
 601 static int __init keepinitrd_setup(char *__unused)
 602 {
 603         keep_initrd = 1;
 604         return 1;
 605 }
 606
 607 __setup("keepinitrd", keepinitrd_setup);
 608 #endif