SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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
  19 #include <asm/mach-types.h>
  20 #include <asm/setup.h>
  21 #include <asm/sizes.h>
  22 #include <asm/tlb.h>
  23
  24 #include <asm/mach/arch.h>
  25 #include <asm/mach/map.h>
  26
  27 #include "mm.h"
  28
  29 static unsigned long phys_initrd_start __initdata = 0;
  30 static unsigned long phys_initrd_size __initdata = 0;
  31
  32 static void __init early_initrd(char **p)
  33 {
  34         unsigned long start, size;
  35
  36         start = memparse(*p, p);
  37         if (**p == ',') {
  38                 size = memparse((*p) + 1, p);
  39
  40                 phys_initrd_start = start;
  41                 phys_initrd_size = size;
  42         }
  43 }
  44 __early_param("initrd=", early_initrd);
  45
  46 static int __init parse_tag_initrd(const struct tag *tag)
  47 {
  48         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
  49                 "please update your bootloader.\n");
  50         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  51         phys_initrd_size = tag->u.initrd.size;
  52         return 0;
  53 }
  54
  55 __tagtable(ATAG_INITRD, parse_tag_initrd);
  56
  57 static int __init parse_tag_initrd2(const struct tag *tag)
  58 {
  59         phys_initrd_start = tag->u.initrd.start;
  60         phys_initrd_size = tag->u.initrd.size;
  61         return 0;
  62 }
  63
  64 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  65
  66 /*
  67  * This keeps memory configuration data used by a couple memory
  68  * initialization functions, as well as show_mem() for the skipping
  69  * of holes in the memory map.  It is populated by arm_add_memory().
  70  */
  71 struct meminfo meminfo;
  72
  73 void show_mem(void)
  74 {
  75         int free = 0, total = 0, reserved = 0;
  76         int shared = 0, cached = 0, slab = 0, node, i;
  77         struct meminfo * mi = &meminfo;
  78
  79         printk("Mem-info:\n");
  80         show_free_areas();
  81         for_each_online_node(node) {
  82                 pg_data_t *n = NODE_DATA(node);
  83                 struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn;
  84
  85                 for_each_nodebank (i,mi,node) {
  86                         struct membank *bank = &mi->bank[i];
  87                         unsigned int pfn1, pfn2;
  88                         struct page *page, *end;
  89
  90                         pfn1 = bank_pfn_start(bank);
  91                         pfn2 = bank_pfn_end(bank);
  92
  93                         page = map + pfn1;
  94                         end  = map + pfn2;
  95
  96                         do {
  97                                 total++;
  98                                 if (PageReserved(page))
  99                                         reserved++;
 100                                 else if (PageSwapCache(page))
 101                                         cached++;
 102                                 else if (PageSlab(page))
 103                                         slab++;
 104                                 else if (!page_count(page))
 105                                         free++;
 106                                 else
 107                                         shared += page_count(page) - 1;
 108                                 page++;
 109                         } while (page < end);
 110                 }
 111         }
 112
 113         printk("%d pages of RAM\n", total);
 114         printk("%d free pages\n", free);
 115         printk("%d reserved pages\n", reserved);
 116         printk("%d slab pages\n", slab);
 117         printk("%d pages shared\n", shared);
 118         printk("%d pages swap cached\n", cached);
 119 }
 120
 121 /*
 122  * FIXME: We really want to avoid allocating the bootmap bitmap
 123  * over the top of the initrd.  Hopefully, this is located towards
 124  * the start of a bank, so if we allocate the bootmap bitmap at
 125  * the end, we won't clash.
 126  */
 127 static unsigned int __init
 128 find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
 129 {
 130         unsigned int start_pfn, i, bootmap_pfn;
 131
 132         start_pfn   = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT;
 133         bootmap_pfn = 0;
 134
 135         for_each_nodebank(i, mi, node) {
 136                 struct membank *bank = &mi->bank[i];
 137                 unsigned int start, end;
 138
 139                 start = bank_pfn_start(bank);
 140                 end   = bank_pfn_end(bank);
 141
 142                 if (end < start_pfn)
 143                         continue;
 144
 145                 if (start < start_pfn)
 146                         start = start_pfn;
 147
 148                 if (end <= start)
 149                         continue;
 150
 151                 if (end - start >= bootmap_pages) {
 152                         bootmap_pfn = start;
 153                         break;
 154                 }
 155         }
 156
 157         if (bootmap_pfn == 0)
 158                 BUG();
 159
 160         return bootmap_pfn;
 161 }
 162
 163 static int __init check_initrd(struct meminfo *mi)
 164 {
 165         int initrd_node = -2;
 166 #ifdef CONFIG_BLK_DEV_INITRD
 167         unsigned long end = phys_initrd_start + phys_initrd_size;
 168
 169         /*
 170          * Make sure that the initrd is within a valid area of
 171          * memory.
 172          */
 173         if (phys_initrd_size) {
 174                 unsigned int i;
 175
 176                 initrd_node = -1;
 177
 178                 for (i = 0; i < mi->nr_banks; i++) {
 179                         struct membank *bank = &mi->bank[i];
 180                         if (bank_phys_start(bank) <= phys_initrd_start &&
 181                             end <= bank_phys_end(bank))
 182                                 initrd_node = bank->node;
 183                 }
 184         }
 185
 186         if (initrd_node == -1) {
 187                 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
 188                        "physical memory - disabling initrd\n",
 189                        phys_initrd_start, phys_initrd_size);
 190                 phys_initrd_start = phys_initrd_size = 0;
 191         }
 192 #endif
 193
 194         return initrd_node;
 195 }
 196
 197 static inline void map_memory_bank(struct membank *bank)
 198 {
 199 #ifdef CONFIG_MMU
 200         struct map_desc map;
 201
 202         map.pfn = bank_pfn_start(bank);
 203         map.virtual = __phys_to_virt(bank_phys_start(bank));
 204         map.length = bank_phys_size(bank);
 205         map.type = MT_MEMORY;
 206
 207         create_mapping(&map);
 208 #endif
 209 }
 210
 211 static unsigned long __init bootmem_init_node(int node, struct meminfo *mi)
 212 {
 213         unsigned long start_pfn, end_pfn, boot_pfn;
 214         unsigned int boot_pages;
 215         pg_data_t *pgdat;
 216         int i;
 217
 218         start_pfn = -1UL;
 219         end_pfn = 0;
 220
 221         /*
 222          * Calculate the pfn range, and map the memory banks for this node.
 223          */
 224         for_each_nodebank(i, mi, node) {
 225                 struct membank *bank = &mi->bank[i];
 226                 unsigned long start, end;
 227
 228                 start = bank_pfn_start(bank);
 229                 end = bank_pfn_end(bank);
 230
 231                 if (start_pfn > start)
 232                         start_pfn = start;
 233                 if (end_pfn < end)
 234                         end_pfn = end;
 235
 236                 map_memory_bank(bank);
 237         }
 238
 239         /*
 240          * If there is no memory in this node, ignore it.
 241          */
 242         if (end_pfn == 0)
 243                 return end_pfn;
 244
 245         /*
 246          * Allocate the bootmem bitmap page.
 247          */
 248         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 249         boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
 250
 251         /*
 252          * Initialise the bootmem allocator for this node, handing the
 253          * memory banks over to bootmem.
 254          */
 255         node_set_online(node);
 256         pgdat = NODE_DATA(node);
 257         init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
 258
 259         for_each_nodebank(i, mi, node) {
 260                 struct membank *bank = &mi->bank[i];
 261                 free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
 262                 memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
 263         }
 264
 265         /*
 266          * Reserve the bootmem bitmap for this node.
 267          */
 268         reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
 269                              boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
 270
 271         return end_pfn;
 272 }
 273
 274 static void __init bootmem_reserve_initrd(int node)
 275 {
 276 #ifdef CONFIG_BLK_DEV_INITRD
 277         pg_data_t *pgdat = NODE_DATA(node);
 278         int res;
 279
 280         res = reserve_bootmem_node(pgdat, phys_initrd_start,
 281                              phys_initrd_size, BOOTMEM_EXCLUSIVE);
 282
 283         if (res == 0) {
 284                 initrd_start = __phys_to_virt(phys_initrd_start);
 285                 initrd_end = initrd_start + phys_initrd_size;
 286         } else {
 287                 printk(KERN_ERR
 288                         "INITRD: 0x%08lx+0x%08lx overlaps in-use "
 289                         "memory region - disabling initrd\n",
 290                         phys_initrd_start, phys_initrd_size);
 291         }
 292 #endif
 293 }
 294
 295 static void __init bootmem_free_node(int node, struct meminfo *mi)
 296 {
 297         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 298         unsigned long start_pfn, end_pfn;
 299         pg_data_t *pgdat = NODE_DATA(node);
 300         int i;
 301
 302         start_pfn = pgdat->bdata->node_min_pfn;
 303         end_pfn = pgdat->bdata->node_low_pfn;
 304
 305         /*
 306          * initialise the zones within this node.
 307          */
 308         memset(zone_size, 0, sizeof(zone_size));
 309         memset(zhole_size, 0, sizeof(zhole_size));
 310
 311         /*
 312          * The size of this node has already been determined.  If we need
 313          * to do anything fancy with the allocation of this memory to the
 314          * zones, now is the time to do it.
 315          */
 316         zone_size[0] = end_pfn - start_pfn;
 317
 318         /*
 319          * For each bank in this node, calculate the size of the holes.
 320          *  holes = node_size - sum(bank_sizes_in_node)
 321          */
 322         zhole_size[0] = zone_size[0];
 323         for_each_nodebank(i, mi, node)
 324                 zhole_size[0] -= bank_pfn_size(&mi->bank[i]);
 325
 326         /*
 327          * Adjust the sizes according to any special requirements for
 328          * this machine type.
 329          */
 330         arch_adjust_zones(node, zone_size, zhole_size);
 331
 332         free_area_init_node(node, zone_size, start_pfn, zhole_size);
 333 }
 334
 335 void __init bootmem_init(void)
 336 {
 337         struct meminfo *mi = &meminfo;
 338         unsigned long memend_pfn = 0;
 339         int node, initrd_node;
 340
 341         /*
 342          * Locate which node contains the ramdisk image, if any.
 343          */
 344         initrd_node = check_initrd(mi);
 345
 346         /*
 347          * Run through each node initialising the bootmem allocator.
 348          */
 349         for_each_node(node) {
 350                 unsigned long end_pfn = bootmem_init_node(node, mi);
 351
 352                 /*
 353                  * Reserve any special node zero regions.
 354                  */
 355                 if (node == 0)
 356                         reserve_node_zero(NODE_DATA(node));
 357
 358                 /*
 359                  * If the initrd is in this node, reserve its memory.
 360                  */
 361                 if (node == initrd_node)
 362                         bootmem_reserve_initrd(node);
 363
 364                 /*
 365                  * Remember the highest memory PFN.
 366                  */
 367                 if (end_pfn > memend_pfn)
 368                         memend_pfn = end_pfn;
 369         }
 370
 371         /*
 372          * sparse_init() needs the bootmem allocator up and running.
 373          */
 374         sparse_init();
 375
 376         /*
 377          * Now free memory in each node - free_area_init_node needs
 378          * the sparse mem_map arrays initialized by sparse_init()
 379          * for memmap_init_zone(), otherwise all PFNs are invalid.
 380          */
 381         for_each_node(node)
 382                 bootmem_free_node(node, mi);
 383
 384         high_memory = __va(memend_pfn << PAGE_SHIFT);
 385
 386         /*
 387          * This doesn't seem to be used by the Linux memory manager any
 388          * more, but is used by ll_rw_block.  If we can get rid of it, we
 389          * also get rid of some of the stuff above as well.
 390          *
 391          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 392          * the system, not the maximum PFN.
 393          */
 394         max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET;
 395 }
 396
 397 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 398 {
 399         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 400
 401         for (; pfn < end; pfn++) {
 402                 struct page *page = pfn_to_page(pfn);
 403                 ClearPageReserved(page);
 404                 init_page_count(page);
 405                 __free_page(page);
 406                 pages++;
 407         }
 408
 409         if (size && s)
 410                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 411
 412         return pages;
 413 }
 414
 415 static inline void
 416 free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
 417 {
 418         struct page *start_pg, *end_pg;
 419         unsigned long pg, pgend;
 420
 421         /*
 422          * Convert start_pfn/end_pfn to a struct page pointer.
 423          */
 424         start_pg = pfn_to_page(start_pfn);
 425         end_pg = pfn_to_page(end_pfn);
 426
 427         /*
 428          * Convert to physical addresses, and
 429          * round start upwards and end downwards.
 430          */
 431         pg = PAGE_ALIGN(__pa(start_pg));
 432         pgend = __pa(end_pg) & PAGE_MASK;
 433
 434         /*
 435          * If there are free pages between these,
 436          * free the section of the memmap array.
 437          */
 438         if (pg < pgend)
 439                 free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
 440 }
 441
 442 /*
 443  * The mem_map array can get very big.  Free the unused area of the memory map.
 444  */
 445 static void __init free_unused_memmap_node(int node, struct meminfo *mi)
 446 {
 447         unsigned long bank_start, prev_bank_end = 0;
 448         unsigned int i;
 449
 450         /*
 451          * [FIXME] This relies on each bank being in address order.  This
 452          * may not be the case, especially if the user has provided the
 453          * information on the command line.
 454          */
 455         for_each_nodebank(i, mi, node) {
 456                 struct membank *bank = &mi->bank[i];
 457
 458                 bank_start = bank_pfn_start(bank);
 459                 if (bank_start < prev_bank_end) {
 460                         printk(KERN_ERR "MEM: unordered memory banks.  "
 461                                 "Not freeing memmap.\n");
 462                         break;
 463                 }
 464
 465                 /*
 466                  * If we had a previous bank, and there is a space
 467                  * between the current bank and the previous, free it.
 468                  */
 469                 if (prev_bank_end && prev_bank_end != bank_start)
 470                         free_memmap(node, prev_bank_end, bank_start);
 471
 472                 prev_bank_end = bank_pfn_end(bank);
 473         }
 474 }
 475
 476 /*
 477  * mem_init() marks the free areas in the mem_map and tells us how much
 478  * memory is free.  This is done after various parts of the system have
 479  * claimed their memory after the kernel image.
 480  */
 481 void __init mem_init(void)
 482 {
 483         unsigned int codesize, datasize, initsize;
 484         int i, node;
 485
 486 #ifndef CONFIG_DISCONTIGMEM
 487         max_mapnr   = virt_to_page(high_memory) - mem_map;
 488 #endif
 489
 490         /* this will put all unused low memory onto the freelists */
 491         for_each_online_node(node) {
 492                 pg_data_t *pgdat = NODE_DATA(node);
 493
 494                 free_unused_memmap_node(node, &meminfo);
 495
 496                 if (pgdat->node_spanned_pages != 0)
 497                         totalram_pages += free_all_bootmem_node(pgdat);
 498         }
 499
 500 #ifdef CONFIG_SA1111
 501         /* now that our DMA memory is actually so designated, we can free it */
 502         totalram_pages += free_area(PHYS_PFN_OFFSET,
 503                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 504 #endif
 505
 506         /*
 507          * Since our memory may not be contiguous, calculate the
 508          * real number of pages we have in this system
 509          */
 510         printk(KERN_INFO "Memory:");
 511         num_physpages = 0;
 512         for (i = 0; i < meminfo.nr_banks; i++) {
 513                 num_physpages += bank_pfn_size(&meminfo.bank[i]);
 514                 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
 515         }
 516         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 517
 518         codesize = &_etext - &_text;
 519         datasize = &_end - &__data_start;
 520         initsize = &__init_end - &__init_begin;
 521
 522         printk(KERN_NOTICE "Memory: %luKB available (%dK code, "
 523                 "%dK data, %dK init)\n",
 524                 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
 525                 codesize >> 10, datasize >> 10, initsize >> 10);
 526
 527         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 528                 extern int sysctl_overcommit_memory;
 529                 /*
 530                  * On a machine this small we won't get
 531                  * anywhere without overcommit, so turn
 532                  * it on by default.
 533                  */
 534                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 535         }
 536 }
 537
 538 void free_initmem(void)
 539 {
 540         if (!machine_is_integrator() && !machine_is_cintegrator())
 541                 totalram_pages += free_area(__phys_to_pfn(__pa(&__init_begin)),
 542                                             __phys_to_pfn(__pa(&__init_end)),
 543                                             "init");
 544 }
 545
 546 #ifdef CONFIG_BLK_DEV_INITRD
 547
 548 static int keep_initrd;
 549
 550 void free_initrd_mem(unsigned long start, unsigned long end)
 551 {
 552         if (!keep_initrd)
 553                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 554                                             __phys_to_pfn(__pa(end)),
 555                                             "initrd");
 556 }
 557
 558 static int __init keepinitrd_setup(char *__unused)
 559 {
 560         keep_initrd = 1;
 561         return 1;
 562 }
 563
 564 __setup("keepinitrd", keepinitrd_setup);
 565 #endif