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 memblock_region *mem = &memblock.memory;
 243         unsigned int left = 0, right = mem->cnt;
 244
 245         do {
 246                 unsigned int mid = (right + left) / 2;
 247
 248                 if (pfn < memblock_start_pfn(mem, mid))
 249                         right = mid;
 250                 else if (pfn >= memblock_end_pfn(mem, mid))
 251                         left = mid + 1;
 252                 else
 253                         return 1;
 254         } while (left < right);
 255         return 0;
 256 }
 257 EXPORT_SYMBOL(pfn_valid);
 258
 259 static void arm_memory_present(void)
 260 {
 261 }
 262 #else
 263 static void arm_memory_present(void)
 264 {
 265         int i;
 266         for (i = 0; i < memblock.memory.cnt; i++)
 267                 memory_present(0, memblock_start_pfn(&memblock.memory, i),
 268                                   memblock_end_pfn(&memblock.memory, i));
 269 }
 270 #endif
 271
 272 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 273 {
 274         int i;
 275
 276         memblock_init();
 277         for (i = 0; i < mi->nr_banks; i++)
 278                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 279
 280         /* Register the kernel text, kernel data and initrd with memblock. */
 281 #ifdef CONFIG_XIP_KERNEL
 282         memblock_reserve(__pa(_data), _end - _data);
 283 #else
 284         memblock_reserve(__pa(_stext), _end - _stext);
 285 #endif
 286 #ifdef CONFIG_BLK_DEV_INITRD
 287         if (phys_initrd_size) {
 288                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 289
 290                 /* Now convert initrd to virtual addresses */
 291                 initrd_start = __phys_to_virt(phys_initrd_start);
 292                 initrd_end = initrd_start + phys_initrd_size;
 293         }
 294 #endif
 295
 296         arm_mm_memblock_reserve();
 297
 298         /* reserve any platform specific memblock areas */
 299         if (mdesc->reserve)
 300                 mdesc->reserve();
 301
 302         memblock_analyze();
 303         memblock_dump_all();
 304 }
 305
 306 void __init bootmem_init(void)
 307 {
 308         struct meminfo *mi = &meminfo;
 309         unsigned long min, max_low, max_high;
 310
 311         max_low = max_high = 0;
 312
 313         find_limits(mi, &min, &max_low, &max_high);
 314
 315         arm_bootmem_init(mi, min, max_low);
 316
 317         /*
 318          * Sparsemem tries to allocate bootmem in memory_present(),
 319          * so must be done after the fixed reservations
 320          */
 321         arm_memory_present();
 322
 323         /*
 324          * sparse_init() needs the bootmem allocator up and running.
 325          */
 326         sparse_init();
 327
 328         /*
 329          * Now free the memory - free_area_init_node needs
 330          * the sparse mem_map arrays initialized by sparse_init()
 331          * for memmap_init_zone(), otherwise all PFNs are invalid.
 332          */
 333         arm_bootmem_free(mi);
 334
 335         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
 336
 337         /*
 338          * This doesn't seem to be used by the Linux memory manager any
 339          * more, but is used by ll_rw_block.  If we can get rid of it, we
 340          * also get rid of some of the stuff above as well.
 341          *
 342          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 343          * the system, not the maximum PFN.
 344          */
 345         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 346         max_pfn = max_high - PHYS_PFN_OFFSET;
 347 }
 348
 349 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 350 {
 351         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 352
 353         for (; pfn < end; pfn++) {
 354                 struct page *page = pfn_to_page(pfn);
 355                 ClearPageReserved(page);
 356                 init_page_count(page);
 357                 __free_page(page);
 358                 pages++;
 359         }
 360
 361         if (size && s)
 362                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 363
 364         return pages;
 365 }
 366
 367 static inline void
 368 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 369 {
 370         struct page *start_pg, *end_pg;
 371         unsigned long pg, pgend;
 372
 373         /*
 374          * Convert start_pfn/end_pfn to a struct page pointer.
 375          */
 376         start_pg = pfn_to_page(start_pfn - 1) + 1;
 377         end_pg = pfn_to_page(end_pfn);
 378
 379         /*
 380          * Convert to physical addresses, and
 381          * round start upwards and end downwards.
 382          */
 383         pg = PAGE_ALIGN(__pa(start_pg));
 384         pgend = __pa(end_pg) & PAGE_MASK;
 385
 386         /*
 387          * If there are free pages between these,
 388          * free the section of the memmap array.
 389          */
 390         if (pg < pgend)
 391                 free_bootmem(pg, pgend - pg);
 392 }
 393
 394 /*
 395  * The mem_map array can get very big.  Free the unused area of the memory map.
 396  */
 397 static void __init free_unused_memmap(struct meminfo *mi)
 398 {
 399         unsigned long bank_start, prev_bank_end = 0;
 400         unsigned int i;
 401
 402         /*
 403          * [FIXME] This relies on each bank being in address order.  This
 404          * may not be the case, especially if the user has provided the
 405          * information on the command line.
 406          */
 407         for_each_bank(i, mi) {
 408                 struct membank *bank = &mi->bank[i];
 409
 410                 bank_start = bank_pfn_start(bank);
 411                 if (bank_start < prev_bank_end) {
 412                         printk(KERN_ERR "MEM: unordered memory banks.  "
 413                                 "Not freeing memmap.\n");
 414                         break;
 415                 }
 416
 417                 /*
 418                  * If we had a previous bank, and there is a space
 419                  * between the current bank and the previous, free it.
 420                  */
 421                 if (prev_bank_end && prev_bank_end != bank_start)
 422                         free_memmap(prev_bank_end, bank_start);
 423
 424                 prev_bank_end = bank_pfn_end(bank);
 425         }
 426 }
 427
 428 /*
 429  * mem_init() marks the free areas in the mem_map and tells us how much
 430  * memory is free.  This is done after various parts of the system have
 431  * claimed their memory after the kernel image.
 432  */
 433 void __init mem_init(void)
 434 {
 435         unsigned long reserved_pages, free_pages;
 436         int i;
 437
 438         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 439
 440         /* this will put all unused low memory onto the freelists */
 441         free_unused_memmap(&meminfo);
 442
 443         totalram_pages += free_all_bootmem();
 444
 445 #ifdef CONFIG_SA1111
 446         /* now that our DMA memory is actually so designated, we can free it */
 447         totalram_pages += free_area(PHYS_PFN_OFFSET,
 448                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 449 #endif
 450
 451 #ifdef CONFIG_HIGHMEM
 452         /* set highmem page free */
 453         for_each_bank (i, &meminfo) {
 454                 unsigned long start = bank_pfn_start(&meminfo.bank[i]);
 455                 unsigned long end = bank_pfn_end(&meminfo.bank[i]);
 456                 if (start >= max_low_pfn + PHYS_PFN_OFFSET)
 457                         totalhigh_pages += free_area(start, end, NULL);
 458         }
 459         totalram_pages += totalhigh_pages;
 460 #endif
 461
 462         reserved_pages = free_pages = 0;
 463
 464         for_each_bank(i, &meminfo) {
 465                 struct membank *bank = &meminfo.bank[i];
 466                 unsigned int pfn1, pfn2;
 467                 struct page *page, *end;
 468
 469                 pfn1 = bank_pfn_start(bank);
 470                 pfn2 = bank_pfn_end(bank);
 471
 472                 page = pfn_to_page(pfn1);
 473                 end  = pfn_to_page(pfn2 - 1) + 1;
 474
 475                 do {
 476                         if (PageReserved(page))
 477                                 reserved_pages++;
 478                         else if (!page_count(page))
 479                                 free_pages++;
 480                         page++;
 481                 } while (page < end);
 482         }
 483
 484         /*
 485          * Since our memory may not be contiguous, calculate the
 486          * real number of pages we have in this system
 487          */
 488         printk(KERN_INFO "Memory:");
 489         num_physpages = 0;
 490         for (i = 0; i < meminfo.nr_banks; i++) {
 491                 num_physpages += bank_pfn_size(&meminfo.bank[i]);
 492                 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
 493         }
 494         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 495
 496         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 497                 nr_free_pages() << (PAGE_SHIFT-10),
 498                 free_pages << (PAGE_SHIFT-10),
 499                 reserved_pages << (PAGE_SHIFT-10),
 500                 totalhigh_pages << (PAGE_SHIFT-10));
 501
 502 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 503 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 504 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 505
 506         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 507                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 508                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 509 #ifdef CONFIG_MMU
 510                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 511 #endif
 512                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 513                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 514 #ifdef CONFIG_HIGHMEM
 515                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 516 #endif
 517                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 518                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 519                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 520                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
 521
 522                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 523                                 (PAGE_SIZE)),
 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