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, unsigned long min,
 194         unsigned long max_low, unsigned long max_high)
 195 {
 196         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 197         int i;
 198
 199         /*
 200          * initialise the zones.
 201          */
 202         memset(zone_size, 0, sizeof(zone_size));
 203
 204         /*
 205          * The memory size has already been determined.  If we need
 206          * to do anything fancy with the allocation of this memory
 207          * to the zones, now is the time to do it.
 208          */
 209         zone_size[0] = max_low - min;
 210 #ifdef CONFIG_HIGHMEM
 211         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 212 #endif
 213
 214         /*
 215          * Calculate the size of the holes.
 216          *  holes = node_size - sum(bank_sizes)
 217          */
 218         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 219         for_each_bank(i, mi) {
 220                 int idx = 0;
 221 #ifdef CONFIG_HIGHMEM
 222                 if (mi->bank[i].highmem)
 223                         idx = ZONE_HIGHMEM;
 224 #endif
 225                 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
 226         }
 227
 228         /*
 229          * Adjust the sizes according to any special requirements for
 230          * this machine type.
 231          */
 232         arch_adjust_zones(zone_size, zhole_size);
 233
 234         free_area_init_node(0, zone_size, min, zhole_size);
 235 }
 236
 237 #ifndef CONFIG_SPARSEMEM
 238 int pfn_valid(unsigned long pfn)
 239 {
 240         struct memblock_region *mem = &memblock.memory;
 241         unsigned int left = 0, right = mem->cnt;
 242
 243         do {
 244                 unsigned int mid = (right + left) / 2;
 245
 246                 if (pfn < memblock_start_pfn(mem, mid))
 247                         right = mid;
 248                 else if (pfn >= memblock_end_pfn(mem, mid))
 249                         left = mid + 1;
 250                 else
 251                         return 1;
 252         } while (left < right);
 253         return 0;
 254 }
 255 EXPORT_SYMBOL(pfn_valid);
 256
 257 static void arm_memory_present(void)
 258 {
 259 }
 260 #else
 261 static void arm_memory_present(void)
 262 {
 263         int i;
 264         for (i = 0; i < memblock.memory.cnt; i++)
 265                 memory_present(0, memblock_start_pfn(&memblock.memory, i),
 266                                   memblock_end_pfn(&memblock.memory, i));
 267 }
 268 #endif
 269
 270 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 271 {
 272         int i;
 273
 274         memblock_init();
 275         for (i = 0; i < mi->nr_banks; i++)
 276                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 277
 278         /* Register the kernel text, kernel data and initrd with memblock. */
 279 #ifdef CONFIG_XIP_KERNEL
 280         memblock_reserve(__pa(_data), _end - _data);
 281 #else
 282         memblock_reserve(__pa(_stext), _end - _stext);
 283 #endif
 284 #ifdef CONFIG_BLK_DEV_INITRD
 285         if (phys_initrd_size) {
 286                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 287
 288                 /* Now convert initrd to virtual addresses */
 289                 initrd_start = __phys_to_virt(phys_initrd_start);
 290                 initrd_end = initrd_start + phys_initrd_size;
 291         }
 292 #endif
 293
 294         arm_mm_memblock_reserve();
 295
 296         /* reserve any platform specific memblock areas */
 297         if (mdesc->reserve)
 298                 mdesc->reserve();
 299
 300         memblock_analyze();
 301         memblock_dump_all();
 302 }
 303
 304 void __init bootmem_init(void)
 305 {
 306         struct meminfo *mi = &meminfo;
 307         unsigned long min, max_low, max_high;
 308
 309         max_low = max_high = 0;
 310
 311         find_limits(mi, &min, &max_low, &max_high);
 312
 313         arm_bootmem_init(mi, min, max_low);
 314
 315         /*
 316          * Sparsemem tries to allocate bootmem in memory_present(),
 317          * so must be done after the fixed reservations
 318          */
 319         arm_memory_present();
 320
 321         /*
 322          * sparse_init() needs the bootmem allocator up and running.
 323          */
 324         sparse_init();
 325
 326         /*
 327          * Now free the memory - free_area_init_node needs
 328          * the sparse mem_map arrays initialized by sparse_init()
 329          * for memmap_init_zone(), otherwise all PFNs are invalid.
 330          */
 331         arm_bootmem_free(mi, min, max_low, max_high);
 332
 333         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
 334
 335         /*
 336          * This doesn't seem to be used by the Linux memory manager any
 337          * more, but is used by ll_rw_block.  If we can get rid of it, we
 338          * also get rid of some of the stuff above as well.
 339          *
 340          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 341          * the system, not the maximum PFN.
 342          */
 343         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 344         max_pfn = max_high - PHYS_PFN_OFFSET;
 345 }
 346
 347 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 348 {
 349         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 350
 351         for (; pfn < end; pfn++) {
 352                 struct page *page = pfn_to_page(pfn);
 353                 ClearPageReserved(page);
 354                 init_page_count(page);
 355                 __free_page(page);
 356                 pages++;
 357         }
 358
 359         if (size && s)
 360                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 361
 362         return pages;
 363 }
 364
 365 static inline void
 366 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 367 {
 368         struct page *start_pg, *end_pg;
 369         unsigned long pg, pgend;
 370
 371         /*
 372          * Convert start_pfn/end_pfn to a struct page pointer.
 373          */
 374         start_pg = pfn_to_page(start_pfn - 1) + 1;
 375         end_pg = pfn_to_page(end_pfn);
 376
 377         /*
 378          * Convert to physical addresses, and
 379          * round start upwards and end downwards.
 380          */
 381         pg = PAGE_ALIGN(__pa(start_pg));
 382         pgend = __pa(end_pg) & PAGE_MASK;
 383
 384         /*
 385          * If there are free pages between these,
 386          * free the section of the memmap array.
 387          */
 388         if (pg < pgend)
 389                 free_bootmem(pg, pgend - pg);
 390 }
 391
 392 /*
 393  * The mem_map array can get very big.  Free the unused area of the memory map.
 394  */
 395 static void __init free_unused_memmap(struct meminfo *mi)
 396 {
 397         unsigned long bank_start, prev_bank_end = 0;
 398         unsigned int i;
 399
 400         /*
 401          * This relies on each bank being in address order.
 402          * The banks are sorted previously in bootmem_init().
 403          */
 404         for_each_bank(i, mi) {
 405                 struct membank *bank = &mi->bank[i];
 406
 407                 bank_start = bank_pfn_start(bank);
 408
 409                 /*
 410                  * If we had a previous bank, and there is a space
 411                  * between the current bank and the previous, free it.
 412                  */
 413                 if (prev_bank_end && prev_bank_end < bank_start)
 414                         free_memmap(prev_bank_end, bank_start);
 415
 416                 /*
 417                  * Align up here since the VM subsystem insists that the
 418                  * memmap entries are valid from the bank end aligned to
 419                  * MAX_ORDER_NR_PAGES.
 420                  */
 421                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 422         }
 423 }
 424
 425 /*
 426  * mem_init() marks the free areas in the mem_map and tells us how much
 427  * memory is free.  This is done after various parts of the system have
 428  * claimed their memory after the kernel image.
 429  */
 430 void __init mem_init(void)
 431 {
 432         unsigned long reserved_pages, free_pages;
 433         int i;
 434 #ifdef CONFIG_HAVE_TCM
 435         /* These pointers are filled in on TCM detection */
 436         extern u32 dtcm_end;
 437         extern u32 itcm_end;
 438 #endif
 439
 440         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 441
 442         /* this will put all unused low memory onto the freelists */
 443         free_unused_memmap(&meminfo);
 444
 445         totalram_pages += free_all_bootmem();
 446
 447 #ifdef CONFIG_SA1111
 448         /* now that our DMA memory is actually so designated, we can free it */
 449         totalram_pages += free_area(PHYS_PFN_OFFSET,
 450                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 451 #endif
 452
 453 #ifdef CONFIG_HIGHMEM
 454         /* set highmem page free */
 455         for_each_bank (i, &meminfo) {
 456                 unsigned long start = bank_pfn_start(&meminfo.bank[i]);
 457                 unsigned long end = bank_pfn_end(&meminfo.bank[i]);
 458                 if (start >= max_low_pfn + PHYS_PFN_OFFSET)
 459                         totalhigh_pages += free_area(start, end, NULL);
 460         }
 461         totalram_pages += totalhigh_pages;
 462 #endif
 463
 464         reserved_pages = free_pages = 0;
 465
 466         for_each_bank(i, &meminfo) {
 467                 struct membank *bank = &meminfo.bank[i];
 468                 unsigned int pfn1, pfn2;
 469                 struct page *page, *end;
 470
 471                 pfn1 = bank_pfn_start(bank);
 472                 pfn2 = bank_pfn_end(bank);
 473
 474                 page = pfn_to_page(pfn1);
 475                 end  = pfn_to_page(pfn2 - 1) + 1;
 476
 477                 do {
 478                         if (PageReserved(page))
 479                                 reserved_pages++;
 480                         else if (!page_count(page))
 481                                 free_pages++;
 482                         page++;
 483                 } while (page < end);
 484         }
 485
 486         /*
 487          * Since our memory may not be contiguous, calculate the
 488          * real number of pages we have in this system
 489          */
 490         printk(KERN_INFO "Memory:");
 491         num_physpages = 0;
 492         for (i = 0; i < meminfo.nr_banks; i++) {
 493                 num_physpages += bank_pfn_size(&meminfo.bank[i]);
 494                 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
 495         }
 496         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 497
 498         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 499                 nr_free_pages() << (PAGE_SHIFT-10),
 500                 free_pages << (PAGE_SHIFT-10),
 501                 reserved_pages << (PAGE_SHIFT-10),
 502                 totalhigh_pages << (PAGE_SHIFT-10));
 503
 504 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 505 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 506 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 507
 508         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 509                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 510 #ifdef CONFIG_HAVE_TCM
 511                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 512                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 513 #endif
 514                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 515 #ifdef CONFIG_MMU
 516                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 517 #endif
 518                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 519                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 520 #ifdef CONFIG_HIGHMEM
 521                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 522 #endif
 523                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 524                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 525                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 526                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 527
 528                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 529                                 (PAGE_SIZE)),
 530 #ifdef CONFIG_HAVE_TCM
 531                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 532                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 533 #endif
 534                         MLK(FIXADDR_START, FIXADDR_TOP),
 535 #ifdef CONFIG_MMU
 536                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 537 #endif
 538                         MLM(VMALLOC_START, VMALLOC_END),
 539                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 540 #ifdef CONFIG_HIGHMEM
 541                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 542                                 (PAGE_SIZE)),
 543 #endif
 544                         MLM(MODULES_VADDR, MODULES_END),
 545
 546                         MLK_ROUNDUP(__init_begin, __init_end),
 547                         MLK_ROUNDUP(_text, _etext),
 548                         MLK_ROUNDUP(_data, _edata));
 549
 550 #undef MLK
 551 #undef MLM
 552 #undef MLK_ROUNDUP
 553
 554         /*
 555          * Check boundaries twice: Some fundamental inconsistencies can
 556          * be detected at build time already.
 557          */
 558 #ifdef CONFIG_MMU
 559         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 560         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 561
 562         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 563         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 564 #endif
 565
 566 #ifdef CONFIG_HIGHMEM
 567         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 568         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 569 #endif
 570
 571         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 572                 extern int sysctl_overcommit_memory;
 573                 /*
 574                  * On a machine this small we won't get
 575                  * anywhere without overcommit, so turn
 576                  * it on by default.
 577                  */
 578                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 579         }
 580 }
 581
 582 void free_initmem(void)
 583 {
 584 #ifdef CONFIG_HAVE_TCM
 585         extern char __tcm_start, __tcm_end;
 586
 587         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 588                                     __phys_to_pfn(__pa(&__tcm_end)),
 589                                     "TCM link");
 590 #endif
 591
 592         if (!machine_is_integrator() && !machine_is_cintegrator())
 593                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 594                                             __phys_to_pfn(__pa(__init_end)),
 595                                             "init");
 596 }
 597
 598 #ifdef CONFIG_BLK_DEV_INITRD
 599
 600 static int keep_initrd;
 601
 602 void free_initrd_mem(unsigned long start, unsigned long end)
 603 {
 604         if (!keep_initrd)
 605                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 606                                             __phys_to_pfn(__pa(end)),
 607                                             "initrd");
 608 }
 609
 610 static int __init keepinitrd_setup(char *__unused)
 611 {
 612         keep_initrd = 1;
 613         return 1;
 614 }
 615
 616 __setup("keepinitrd", keepinitrd_setup);
 617 #endif