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(struct meminfo *mi,
 152         unsigned long start_pfn, 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         int i;
 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         for_each_bank(i, mi) {
 177                 struct membank *bank = &mi->bank[i];
 178                 if (!bank->highmem)
 179                         free_bootmem(bank_phys_start(bank), bank_phys_size(bank));
 180         }
 181
 182         /*
 183          * Reserve the memblock reserved regions in bootmem.
 184          */
 185         for_each_memblock(reserved, reg) {
 186                 phys_addr_t start = memblock_region_reserved_base_pfn(reg);
 187                 phys_addr_t end = memblock_region_reserved_end_pfn(reg);
 188                 if (start >= start_pfn && end <= end_pfn)
 189                         reserve_bootmem_node(pgdat, __pfn_to_phys(start),
 190                                              (end - start) << PAGE_SHIFT,
 191                                              BOOTMEM_DEFAULT);
 192         }
 193 }
 194
 195 static void __init arm_bootmem_free(struct meminfo *mi, unsigned long min,
 196         unsigned long max_low, unsigned long max_high)
 197 {
 198         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 199         int i;
 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         return memblock_is_memory(pfn << PAGE_SHIFT);
 243 }
 244 EXPORT_SYMBOL(pfn_valid);
 245
 246 static void arm_memory_present(void)
 247 {
 248 }
 249 #else
 250 static void arm_memory_present(void)
 251 {
 252         struct memblock_region *reg;
 253
 254         for_each_memblock(memory, reg)
 255                 memory_present(0, memblock_region_memory_base_pfn(reg),
 256                                memblock_region_memory_end_pfn(reg));
 257 }
 258 #endif
 259
 260 static int __init meminfo_cmp(const void *_a, const void *_b)
 261 {
 262         const struct membank *a = _a, *b = _b;
 263         long cmp = bank_pfn_start(a) - bank_pfn_start(b);
 264         return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
 265 }
 266
 267 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 268 {
 269         int i;
 270
 271         sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
 272
 273         memblock_init();
 274         for (i = 0; i < mi->nr_banks; i++)
 275                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 276
 277         /* Register the kernel text, kernel data and initrd with memblock. */
 278 #ifdef CONFIG_XIP_KERNEL
 279         memblock_reserve(__pa(_sdata), _end - _sdata);
 280 #else
 281         memblock_reserve(__pa(_stext), _end - _stext);
 282 #endif
 283 #ifdef CONFIG_BLK_DEV_INITRD
 284         if (phys_initrd_size) {
 285                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 286
 287                 /* Now convert initrd to virtual addresses */
 288                 initrd_start = __phys_to_virt(phys_initrd_start);
 289                 initrd_end = initrd_start + phys_initrd_size;
 290         }
 291 #endif
 292
 293         arm_mm_memblock_reserve();
 294
 295         /* reserve any platform specific memblock areas */
 296         if (mdesc->reserve)
 297                 mdesc->reserve();
 298
 299         memblock_analyze();
 300         memblock_dump_all();
 301 }
 302
 303 void __init bootmem_init(void)
 304 {
 305         struct meminfo *mi = &meminfo;
 306         unsigned long min, max_low, max_high;
 307
 308         max_low = max_high = 0;
 309
 310         find_limits(mi, &min, &max_low, &max_high);
 311
 312         arm_bootmem_init(mi, min, max_low);
 313
 314         /*
 315          * Sparsemem tries to allocate bootmem in memory_present(),
 316          * so must be done after the fixed reservations
 317          */
 318         arm_memory_present();
 319
 320         /*
 321          * sparse_init() needs the bootmem allocator up and running.
 322          */
 323         sparse_init();
 324
 325         /*
 326          * Now free the memory - free_area_init_node needs
 327          * the sparse mem_map arrays initialized by sparse_init()
 328          * for memmap_init_zone(), otherwise all PFNs are invalid.
 329          */
 330         arm_bootmem_free(mi, min, max_low, max_high);
 331
 332         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
 333
 334         /*
 335          * This doesn't seem to be used by the Linux memory manager any
 336          * more, but is used by ll_rw_block.  If we can get rid of it, we
 337          * also get rid of some of the stuff above as well.
 338          *
 339          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 340          * the system, not the maximum PFN.
 341          */
 342         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 343         max_pfn = max_high - PHYS_PFN_OFFSET;
 344 }
 345
 346 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 347 {
 348         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 349
 350         for (; pfn < end; pfn++) {
 351                 struct page *page = pfn_to_page(pfn);
 352                 ClearPageReserved(page);
 353                 init_page_count(page);
 354                 __free_page(page);
 355                 pages++;
 356         }
 357
 358         if (size && s)
 359                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 360
 361         return pages;
 362 }
 363
 364 static inline void
 365 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 366 {
 367         struct page *start_pg, *end_pg;
 368         unsigned long pg, pgend;
 369
 370         /*
 371          * Convert start_pfn/end_pfn to a struct page pointer.
 372          */
 373         start_pg = pfn_to_page(start_pfn - 1) + 1;
 374         end_pg = pfn_to_page(end_pfn);
 375
 376         /*
 377          * Convert to physical addresses, and
 378          * round start upwards and end downwards.
 379          */
 380         pg = PAGE_ALIGN(__pa(start_pg));
 381         pgend = __pa(end_pg) & PAGE_MASK;
 382
 383         /*
 384          * If there are free pages between these,
 385          * free the section of the memmap array.
 386          */
 387         if (pg < pgend)
 388                 free_bootmem(pg, pgend - pg);
 389 }
 390
 391 /*
 392  * The mem_map array can get very big.  Free the unused area of the memory map.
 393  */
 394 static void __init free_unused_memmap(struct meminfo *mi)
 395 {
 396         unsigned long bank_start, prev_bank_end = 0;
 397         unsigned int i;
 398
 399         /*
 400          * This relies on each bank being in address order.
 401          * The banks are sorted previously in bootmem_init().
 402          */
 403         for_each_bank(i, mi) {
 404                 struct membank *bank = &mi->bank[i];
 405
 406                 bank_start = bank_pfn_start(bank);
 407
 408                 /*
 409                  * If we had a previous bank, and there is a space
 410                  * between the current bank and the previous, free it.
 411                  */
 412                 if (prev_bank_end && prev_bank_end < bank_start)
 413                         free_memmap(prev_bank_end, bank_start);
 414
 415                 /*
 416                  * Align up here since the VM subsystem insists that the
 417                  * memmap entries are valid from the bank end aligned to
 418                  * MAX_ORDER_NR_PAGES.
 419                  */
 420                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 421         }
 422 }
 423
 424 /*
 425  * mem_init() marks the free areas in the mem_map and tells us how much
 426  * memory is free.  This is done after various parts of the system have
 427  * claimed their memory after the kernel image.
 428  */
 429 void __init mem_init(void)
 430 {
 431         unsigned long reserved_pages, free_pages;
 432         int i;
 433 #ifdef CONFIG_HAVE_TCM
 434         /* These pointers are filled in on TCM detection */
 435         extern u32 dtcm_end;
 436         extern u32 itcm_end;
 437 #endif
 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 #ifdef CONFIG_HAVE_TCM
 510                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 511                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 512 #endif
 513                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 514 #ifdef CONFIG_MMU
 515                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 516 #endif
 517                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 518                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 519 #ifdef CONFIG_HIGHMEM
 520                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 521 #endif
 522                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 523                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 524                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 525                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 526
 527                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 528                                 (PAGE_SIZE)),
 529 #ifdef CONFIG_HAVE_TCM
 530                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 531                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 532 #endif
 533                         MLK(FIXADDR_START, FIXADDR_TOP),
 534 #ifdef CONFIG_MMU
 535                         MLM(CONSISTENT_BASE, CONSISTENT_END),
 536 #endif
 537                         MLM(VMALLOC_START, VMALLOC_END),
 538                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 539 #ifdef CONFIG_HIGHMEM
 540                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 541                                 (PAGE_SIZE)),
 542 #endif
 543                         MLM(MODULES_VADDR, MODULES_END),
 544
 545                         MLK_ROUNDUP(__init_begin, __init_end),
 546                         MLK_ROUNDUP(_text, _etext),
 547                         MLK_ROUNDUP(_sdata, _edata));
 548
 549 #undef MLK
 550 #undef MLM
 551 #undef MLK_ROUNDUP
 552
 553         /*
 554          * Check boundaries twice: Some fundamental inconsistencies can
 555          * be detected at build time already.
 556          */
 557 #ifdef CONFIG_MMU
 558         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
 559         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
 560
 561         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 562         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 563 #endif
 564
 565 #ifdef CONFIG_HIGHMEM
 566         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 567         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 568 #endif
 569
 570         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 571                 extern int sysctl_overcommit_memory;
 572                 /*
 573                  * On a machine this small we won't get
 574                  * anywhere without overcommit, so turn
 575                  * it on by default.
 576                  */
 577                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 578         }
 579 }
 580
 581 void free_initmem(void)
 582 {
 583 #ifdef CONFIG_HAVE_TCM
 584         extern char __tcm_start, __tcm_end;
 585
 586         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 587                                     __phys_to_pfn(__pa(&__tcm_end)),
 588                                     "TCM link");
 589 #endif
 590
 591         if (!machine_is_integrator() && !machine_is_cintegrator())
 592                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 593                                             __phys_to_pfn(__pa(__init_end)),
 594                                             "init");
 595 }
 596
 597 #ifdef CONFIG_BLK_DEV_INITRD
 598
 599 static int keep_initrd;
 600
 601 void free_initrd_mem(unsigned long start, unsigned long end)
 602 {
 603         if (!keep_initrd)
 604                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 605                                             __phys_to_pfn(__pa(end)),
 606                                             "initrd");
 607 }
 608
 609 static int __init keepinitrd_setup(char *__unused)
 610 {
 611         keep_initrd = 1;
 612         return 1;
 613 }
 614
 615 __setup("keepinitrd", keepinitrd_setup);
 616 #endif