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         struct memblock_region *reg;
 154         unsigned int boot_pages;
 155         phys_addr_t bitmap;
 156         pg_data_t *pgdat;
 157         int i;
 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         for_each_bank(i, mi) {
 176                 struct membank *bank = &mi->bank[i];
 177                 if (!bank->highmem)
 178                         free_bootmem(bank_phys_start(bank), bank_phys_size(bank));
 179         }
 180
 181         /*
 182          * Reserve the memblock reserved regions in bootmem.
 183          */
 184         for_each_memblock(reserved, reg) {
 185                 phys_addr_t start = memblock_region_reserved_base_pfn(reg);
 186                 phys_addr_t end = memblock_region_reserved_end_pfn(reg);
 187                 if (start >= start_pfn && end <= end_pfn)
 188                         reserve_bootmem_node(pgdat, __pfn_to_phys(start),
 189                                              (end - start) << PAGE_SHIFT,
 190                                              BOOTMEM_DEFAULT);
 191         }
 192 }
 193
 194 static void __init arm_bootmem_free(struct meminfo *mi, unsigned long min,
 195         unsigned long max_low, unsigned long max_high)
 196 {
 197         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 198         int i;
 199
 200         /*
 201          * initialise the zones.
 202          */
 203         memset(zone_size, 0, sizeof(zone_size));
 204
 205         /*
 206          * The memory size has already been determined.  If we need
 207          * to do anything fancy with the allocation of this memory
 208          * to the zones, now is the time to do it.
 209          */
 210         zone_size[0] = max_low - min;
 211 #ifdef CONFIG_HIGHMEM
 212         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 213 #endif
 214
 215         /*
 216          * Calculate the size of the holes.
 217          *  holes = node_size - sum(bank_sizes)
 218          */
 219         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 220         for_each_bank(i, mi) {
 221                 int idx = 0;
 222 #ifdef CONFIG_HIGHMEM
 223                 if (mi->bank[i].highmem)
 224                         idx = ZONE_HIGHMEM;
 225 #endif
 226                 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
 227         }
 228
 229         /*
 230          * Adjust the sizes according to any special requirements for
 231          * this machine type.
 232          */
 233         arch_adjust_zones(zone_size, zhole_size);
 234
 235         free_area_init_node(0, zone_size, min, zhole_size);
 236 }
 237
 238 #ifndef CONFIG_SPARSEMEM
 239 int pfn_valid(unsigned long pfn)
 240 {
 241         return memblock_is_memory(pfn << PAGE_SHIFT);
 242 }
 243 EXPORT_SYMBOL(pfn_valid);
 244
 245 static void arm_memory_present(void)
 246 {
 247 }
 248 #else
 249 static void arm_memory_present(void)
 250 {
 251         struct memblock_region *reg;
 252
 253         for_each_memblock(memory, reg)
 254                 memory_present(0, memblock_region_memory_base_pfn(reg),
 255                                memblock_region_memory_end_pfn(reg));
 256 }
 257 #endif
 258
 259 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 260 {
 261         int i;
 262
 263         memblock_init();
 264         for (i = 0; i < mi->nr_banks; i++)
 265                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 266
 267         /* Register the kernel text, kernel data and initrd with memblock. */
 268 #ifdef CONFIG_XIP_KERNEL
 269         memblock_reserve(__pa(_sdata), _end - _sdata);
 270 #else
 271         memblock_reserve(__pa(_stext), _end - _stext);
 272 #endif
 273 #ifdef CONFIG_BLK_DEV_INITRD
 274         if (phys_initrd_size) {
 275                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 276
 277                 /* Now convert initrd to virtual addresses */
 278                 initrd_start = __phys_to_virt(phys_initrd_start);
 279                 initrd_end = initrd_start + phys_initrd_size;
 280         }
 281 #endif
 282
 283         arm_mm_memblock_reserve();
 284
 285         /* reserve any platform specific memblock areas */
 286         if (mdesc->reserve)
 287                 mdesc->reserve();
 288
 289         memblock_analyze();
 290         memblock_dump_all();
 291 }
 292
 293 void __init bootmem_init(void)
 294 {
 295         struct meminfo *mi = &meminfo;
 296         unsigned long min, max_low, max_high;
 297
 298         max_low = max_high = 0;
 299
 300         find_limits(mi, &min, &max_low, &max_high);
 301
 302         arm_bootmem_init(mi, min, max_low);
 303
 304         /*
 305          * Sparsemem tries to allocate bootmem in memory_present(),
 306          * so must be done after the fixed reservations
 307          */
 308         arm_memory_present();
 309
 310         /*
 311          * sparse_init() needs the bootmem allocator up and running.
 312          */
 313         sparse_init();
 314
 315         /*
 316          * Now free the memory - free_area_init_node needs
 317          * the sparse mem_map arrays initialized by sparse_init()
 318          * for memmap_init_zone(), otherwise all PFNs are invalid.
 319          */
 320         arm_bootmem_free(mi, min, max_low, max_high);
 321
 322         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
 323
 324         /*
 325          * This doesn't seem to be used by the Linux memory manager any
 326          * more, but is used by ll_rw_block.  If we can get rid of it, we
 327          * also get rid of some of the stuff above as well.
 328          *
 329          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 330          * the system, not the maximum PFN.
 331          */
 332         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 333         max_pfn = max_high - PHYS_PFN_OFFSET;
 334 }
 335
 336 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 337 {
 338         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 339
 340         for (; pfn < end; pfn++) {
 341                 struct page *page = pfn_to_page(pfn);
 342                 ClearPageReserved(page);
 343                 init_page_count(page);
 344                 __free_page(page);
 345                 pages++;
 346         }
 347
 348         if (size && s)
 349                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 350
 351         return pages;
 352 }
 353
 354 static inline void
 355 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 356 {
 357         struct page *start_pg, *end_pg;
 358         unsigned long pg, pgend;
 359
 360         /*
 361          * Convert start_pfn/end_pfn to a struct page pointer.
 362          */
 363         start_pg = pfn_to_page(start_pfn - 1) + 1;
 364         end_pg = pfn_to_page(end_pfn);
 365
 366         /*
 367          * Convert to physical addresses, and
 368          * round start upwards and end downwards.
 369          */
 370         pg = PAGE_ALIGN(__pa(start_pg));
 371         pgend = __pa(end_pg) & PAGE_MASK;
 372
 373         /*
 374          * If there are free pages between these,
 375          * free the section of the memmap array.
 376          */
 377         if (pg < pgend)
 378                 free_bootmem(pg, pgend - pg);
 379 }
 380
 381 /*
 382  * The mem_map array can get very big.  Free the unused area of the memory map.
 383  */
 384 static void __init free_unused_memmap(struct meminfo *mi)
 385 {
 386         unsigned long bank_start, prev_bank_end = 0;
 387         unsigned int i;
 388
 389         /*
 390          * This relies on each bank being in address order.
 391          * The banks are sorted previously in bootmem_init().
 392          */
 393         for_each_bank(i, mi) {
 394                 struct membank *bank = &mi->bank[i];
 395
 396                 bank_start = bank_pfn_start(bank);
 397
 398                 /*
 399                  * If we had a previous bank, and there is a space
 400                  * between the current bank and the previous, free it.
 401                  */
 402                 if (prev_bank_end && prev_bank_end < bank_start)
 403                         free_memmap(prev_bank_end, bank_start);
 404
 405                 /*
 406                  * Align up here since the VM subsystem insists that the
 407                  * memmap entries are valid from the bank end aligned to
 408                  * MAX_ORDER_NR_PAGES.
 409                  */
 410                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 411         }
 412 }
 413
 414 /*
 415  * mem_init() marks the free areas in the mem_map and tells us how much
 416  * memory is free.  This is done after various parts of the system have
 417  * claimed their memory after the kernel image.
 418  */
 419 void __init mem_init(void)
 420 {
 421         unsigned long reserved_pages, free_pages;
 422         int i;
 423 #ifdef CONFIG_HAVE_TCM
 424         /* These pointers are filled in on TCM detection */
 425         extern u32 dtcm_end;
 426         extern u32 itcm_end;
 427 #endif
 428
 429         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 430
 431         /* this will put all unused low memory onto the freelists */
 432         free_unused_memmap(&meminfo);
 433
 434         totalram_pages += free_all_bootmem();
 435
 436 #ifdef CONFIG_SA1111
 437         /* now that our DMA memory is actually so designated, we can free it */
 438         totalram_pages += free_area(PHYS_PFN_OFFSET,
 439                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 440 #endif
 441
 442 #ifdef CONFIG_HIGHMEM
 443         /* set highmem page free */
 444         for_each_bank (i, &meminfo) {
 445                 unsigned long start = bank_pfn_start(&meminfo.bank[i]);
 446                 unsigned long end = bank_pfn_end(&meminfo.bank[i]);
 447                 if (start >= max_low_pfn + PHYS_PFN_OFFSET)
 448                         totalhigh_pages += free_area(start, end, NULL);
 449         }
 450         totalram_pages += totalhigh_pages;
 451 #endif
 452
 453         reserved_pages = free_pages = 0;
 454
 455         for_each_bank(i, &meminfo) {
 456                 struct membank *bank = &meminfo.bank[i];
 457                 unsigned int pfn1, pfn2;
 458                 struct page *page, *end;
 459
 460                 pfn1 = bank_pfn_start(bank);
 461                 pfn2 = bank_pfn_end(bank);
 462
 463                 page = pfn_to_page(pfn1);
 464                 end  = pfn_to_page(pfn2 - 1) + 1;
 465
 466                 do {
 467                         if (PageReserved(page))
 468                                 reserved_pages++;
 469                         else if (!page_count(page))
 470                                 free_pages++;
 471                         page++;
 472                 } while (page < end);
 473         }
 474
 475         /*
 476          * Since our memory may not be contiguous, calculate the
 477          * real number of pages we have in this system
 478          */
 479         printk(KERN_INFO "Memory:");
 480         num_physpages = 0;
 481         for (i = 0; i < meminfo.nr_banks; i++) {
 482                 num_physpages += bank_pfn_size(&meminfo.bank[i]);
 483                 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
 484         }
 485         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 486
 487         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 488                 nr_free_pages() << (PAGE_SHIFT-10),
 489                 free_pages << (PAGE_SHIFT-10),
 490                 reserved_pages << (PAGE_SHIFT-10),
 491                 totalhigh_pages << (PAGE_SHIFT-10));
 492
 493 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 494 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 495 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 496
 497         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 498                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 499 #ifdef CONFIG_HAVE_TCM
 500                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 501                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 502 #endif
 503                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 504 #ifdef CONFIG_MMU
 505                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 506 #endif
 507                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 508                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 509 #ifdef CONFIG_HIGHMEM
 510                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 511 #endif
 512                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 513                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 514                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 515                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 516
 517                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 518                                 (PAGE_SIZE)),
 519 #ifdef CONFIG_HAVE_TCM
 520                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 521                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 522 #endif
 523                         MLK(FIXADDR_START, FIXADDR_TOP),
 524 #ifdef CONFIG_MMU
 525                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 526 #endif
 527                         MLM(VMALLOC_START, VMALLOC_END),
 528                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 529 #ifdef CONFIG_HIGHMEM
 530                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 531                                 (PAGE_SIZE)),
 532 #endif
 533                         MLM(MODULES_VADDR, MODULES_END),
 534
 535                         MLK_ROUNDUP(__init_begin, __init_end),
 536                         MLK_ROUNDUP(_text, _etext),
 537                         MLK_ROUNDUP(_sdata, _edata));
 538
 539 #undef MLK
 540 #undef MLM
 541 #undef MLK_ROUNDUP
 542
 543         /*
 544          * Check boundaries twice: Some fundamental inconsistencies can
 545          * be detected at build time already.
 546          */
 547 #ifdef CONFIG_MMU
 548         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 549         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 550
 551         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 552         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 553 #endif
 554
 555 #ifdef CONFIG_HIGHMEM
 556         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 557         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 558 #endif
 559
 560         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 561                 extern int sysctl_overcommit_memory;
 562                 /*
 563                  * On a machine this small we won't get
 564                  * anywhere without overcommit, so turn
 565                  * it on by default.
 566                  */
 567                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 568         }
 569 }
 570
 571 void free_initmem(void)
 572 {
 573 #ifdef CONFIG_HAVE_TCM
 574         extern char __tcm_start, __tcm_end;
 575
 576         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 577                                     __phys_to_pfn(__pa(&__tcm_end)),
 578                                     "TCM link");
 579 #endif
 580
 581         if (!machine_is_integrator() && !machine_is_cintegrator())
 582                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 583                                             __phys_to_pfn(__pa(__init_end)),
 584                                             "init");
 585 }
 586
 587 #ifdef CONFIG_BLK_DEV_INITRD
 588
 589 static int keep_initrd;
 590
 591 void free_initrd_mem(unsigned long start, unsigned long end)
 592 {
 593         if (!keep_initrd)
 594                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 595                                             __phys_to_pfn(__pa(end)),
 596                                             "initrd");
 597 }
 598
 599 static int __init keepinitrd_setup(char *__unused)
 600 {
 601         keep_initrd = 1;
 602         return 1;
 603 }
 604
 605 __setup("keepinitrd", keepinitrd_setup);
 606 #endif