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