arch/parisc/mm/init.c

   1 /*
   2  *  linux/arch/parisc/mm/init.c
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *  Copyright 1999 SuSE GmbH
   6  *    changed by Philipp Rumpf
   7  *  Copyright 1999 Philipp Rumpf (prumpf@tux.org)
   8  *  Copyright 2004 Randolph Chung (tausq@debian.org)
   9  *  Copyright 2006-2007 Helge Deller (deller@gmx.de)
  10  *
  11  */
  12
  13
  14 #include <linux/module.h>
  15 #include <linux/mm.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/gfp.h>
  18 #include <linux/delay.h>
  19 #include <linux/init.h>
  20 #include <linux/pci.h>          /* for hppa_dma_ops and pcxl_dma_ops */
  21 #include <linux/initrd.h>
  22 #include <linux/swap.h>
  23 #include <linux/unistd.h>
  24 #include <linux/nodemask.h>     /* for node_online_map */
  25 #include <linux/pagemap.h>      /* for release_pages and page_cache_release */
  26
  27 #include <asm/pgalloc.h>
  28 #include <asm/pgtable.h>
  29 #include <asm/tlb.h>
  30 #include <asm/pdc_chassis.h>
  31 #include <asm/mmzone.h>
  32 #include <asm/sections.h>
  33
  34 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  35
  36 extern int  data_start;
  37
  38 #ifdef CONFIG_DISCONTIGMEM
  39 struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
  40 unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
  41 #endif
  42
  43 static struct resource data_resource = {
  44         .name   = "Kernel data",
  45         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  46 };
  47
  48 static struct resource code_resource = {
  49         .name   = "Kernel code",
  50         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  51 };
  52
  53 static struct resource pdcdata_resource = {
  54         .name   = "PDC data (Page Zero)",
  55         .start  = 0,
  56         .end    = 0x9ff,
  57         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  58 };
  59
  60 static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
  61
  62 /* The following array is initialized from the firmware specific
  63  * information retrieved in kernel/inventory.c.
  64  */
  65
  66 physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
  67 int npmem_ranges __read_mostly;
  68
  69 #ifdef CONFIG_64BIT
  70 #define MAX_MEM         (~0UL)
  71 #else /* !CONFIG_64BIT */
  72 #define MAX_MEM         (3584U*1024U*1024U)
  73 #endif /* !CONFIG_64BIT */
  74
  75 static unsigned long mem_limit __read_mostly = MAX_MEM;
  76
  77 static void __init mem_limit_func(void)
  78 {
  79         char *cp, *end;
  80         unsigned long limit;
  81
  82         /* We need this before __setup() functions are called */
  83
  84         limit = MAX_MEM;
  85         for (cp = boot_command_line; *cp; ) {
  86                 if (memcmp(cp, "mem=", 4) == 0) {
  87                         cp += 4;
  88                         limit = memparse(cp, &end);
  89                         if (end != cp)
  90                                 break;
  91                         cp = end;
  92                 } else {
  93                         while (*cp != ' ' && *cp)
  94                                 ++cp;
  95                         while (*cp == ' ')
  96                                 ++cp;
  97                 }
  98         }
  99
 100         if (limit < mem_limit)
 101                 mem_limit = limit;
 102 }
 103
 104 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
 105
 106 static void __init setup_bootmem(void)
 107 {
 108         unsigned long bootmap_size;
 109         unsigned long mem_max;
 110         unsigned long bootmap_pages;
 111         unsigned long bootmap_start_pfn;
 112         unsigned long bootmap_pfn;
 113 #ifndef CONFIG_DISCONTIGMEM
 114         physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
 115         int npmem_holes;
 116 #endif
 117         int i, sysram_resource_count;
 118
 119         disable_sr_hashing(); /* Turn off space register hashing */
 120
 121         /*
 122          * Sort the ranges. Since the number of ranges is typically
 123          * small, and performance is not an issue here, just do
 124          * a simple insertion sort.
 125          */
 126
 127         for (i = 1; i < npmem_ranges; i++) {
 128                 int j;
 129
 130                 for (j = i; j > 0; j--) {
 131                         unsigned long tmp;
 132
 133                         if (pmem_ranges[j-1].start_pfn <
 134                             pmem_ranges[j].start_pfn) {
 135
 136                                 break;
 137                         }
 138                         tmp = pmem_ranges[j-1].start_pfn;
 139                         pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
 140                         pmem_ranges[j].start_pfn = tmp;
 141                         tmp = pmem_ranges[j-1].pages;
 142                         pmem_ranges[j-1].pages = pmem_ranges[j].pages;
 143                         pmem_ranges[j].pages = tmp;
 144                 }
 145         }
 146
 147 #ifndef CONFIG_DISCONTIGMEM
 148         /*
 149          * Throw out ranges that are too far apart (controlled by
 150          * MAX_GAP).
 151          */
 152
 153         for (i = 1; i < npmem_ranges; i++) {
 154                 if (pmem_ranges[i].start_pfn -
 155                         (pmem_ranges[i-1].start_pfn +
 156                          pmem_ranges[i-1].pages) > MAX_GAP) {
 157                         npmem_ranges = i;
 158                         printk("Large gap in memory detected (%ld pages). "
 159                                "Consider turning on CONFIG_DISCONTIGMEM\n",
 160                                pmem_ranges[i].start_pfn -
 161                                (pmem_ranges[i-1].start_pfn +
 162                                 pmem_ranges[i-1].pages));
 163                         break;
 164                 }
 165         }
 166 #endif
 167
 168         if (npmem_ranges > 1) {
 169
 170                 /* Print the memory ranges */
 171
 172                 printk(KERN_INFO "Memory Ranges:\n");
 173
 174                 for (i = 0; i < npmem_ranges; i++) {
 175                         unsigned long start;
 176                         unsigned long size;
 177
 178                         size = (pmem_ranges[i].pages << PAGE_SHIFT);
 179                         start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
 180                         printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
 181                                 i,start, start + (size - 1), size >> 20);
 182                 }
 183         }
 184
 185         sysram_resource_count = npmem_ranges;
 186         for (i = 0; i < sysram_resource_count; i++) {
 187                 struct resource *res = &sysram_resources[i];
 188                 res->name = "System RAM";
 189                 res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT;
 190                 res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1;
 191                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 192                 request_resource(&iomem_resource, res);
 193         }
 194
 195         /*
 196          * For 32 bit kernels we limit the amount of memory we can
 197          * support, in order to preserve enough kernel address space
 198          * for other purposes. For 64 bit kernels we don't normally
 199          * limit the memory, but this mechanism can be used to
 200          * artificially limit the amount of memory (and it is written
 201          * to work with multiple memory ranges).
 202          */
 203
 204         mem_limit_func();       /* check for "mem=" argument */
 205
 206         mem_max = 0;
 207         num_physpages = 0;
 208         for (i = 0; i < npmem_ranges; i++) {
 209                 unsigned long rsize;
 210
 211                 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
 212                 if ((mem_max + rsize) > mem_limit) {
 213                         printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
 214                         if (mem_max == mem_limit)
 215                                 npmem_ranges = i;
 216                         else {
 217                                 pmem_ranges[i].pages =   (mem_limit >> PAGE_SHIFT)
 218                                                        - (mem_max >> PAGE_SHIFT);
 219                                 npmem_ranges = i + 1;
 220                                 mem_max = mem_limit;
 221                         }
 222                 num_physpages += pmem_ranges[i].pages;
 223                         break;
 224                 }
 225             num_physpages += pmem_ranges[i].pages;
 226                 mem_max += rsize;
 227         }
 228
 229         printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
 230
 231 #ifndef CONFIG_DISCONTIGMEM
 232         /* Merge the ranges, keeping track of the holes */
 233
 234         {
 235                 unsigned long end_pfn;
 236                 unsigned long hole_pages;
 237
 238                 npmem_holes = 0;
 239                 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
 240                 for (i = 1; i < npmem_ranges; i++) {
 241
 242                         hole_pages = pmem_ranges[i].start_pfn - end_pfn;
 243                         if (hole_pages) {
 244                                 pmem_holes[npmem_holes].start_pfn = end_pfn;
 245                                 pmem_holes[npmem_holes++].pages = hole_pages;
 246                                 end_pfn += hole_pages;
 247                         }
 248                         end_pfn += pmem_ranges[i].pages;
 249                 }
 250
 251                 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
 252                 npmem_ranges = 1;
 253         }
 254 #endif
 255
 256         bootmap_pages = 0;
 257         for (i = 0; i < npmem_ranges; i++)
 258                 bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages);
 259
 260         bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT;
 261
 262 #ifdef CONFIG_DISCONTIGMEM
 263         for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
 264                 memset(NODE_DATA(i), 0, sizeof(pg_data_t));
 265                 NODE_DATA(i)->bdata = &bootmem_node_data[i];
 266         }
 267         memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
 268
 269         for (i = 0; i < npmem_ranges; i++)
 270                 node_set_online(i);
 271 #endif
 272
 273         /*
 274          * Initialize and free the full range of memory in each range.
 275          * Note that the only writing these routines do are to the bootmap,
 276          * and we've made sure to locate the bootmap properly so that they
 277          * won't be writing over anything important.
 278          */
 279
 280         bootmap_pfn = bootmap_start_pfn;
 281         max_pfn = 0;
 282         for (i = 0; i < npmem_ranges; i++) {
 283                 unsigned long start_pfn;
 284                 unsigned long npages;
 285
 286                 start_pfn = pmem_ranges[i].start_pfn;
 287                 npages = pmem_ranges[i].pages;
 288
 289                 bootmap_size = init_bootmem_node(NODE_DATA(i),
 290                                                 bootmap_pfn,
 291                                                 start_pfn,
 292                                                 (start_pfn + npages) );
 293                 free_bootmem_node(NODE_DATA(i),
 294                                   (start_pfn << PAGE_SHIFT),
 295                                   (npages << PAGE_SHIFT) );
 296                 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 297                 if ((start_pfn + npages) > max_pfn)
 298                         max_pfn = start_pfn + npages;
 299         }
 300
 301         /* IOMMU is always used to access "high mem" on those boxes
 302          * that can support enough mem that a PCI device couldn't
 303          * directly DMA to any physical addresses.
 304          * ISA DMA support will need to revisit this.
 305          */
 306         max_low_pfn = max_pfn;
 307
 308         /* bootmap sizing messed up? */
 309         BUG_ON((bootmap_pfn - bootmap_start_pfn) != bootmap_pages);
 310
 311         /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
 312
 313 #define PDC_CONSOLE_IO_IODC_SIZE 32768
 314
 315         reserve_bootmem_node(NODE_DATA(0), 0UL,
 316                         (unsigned long)(PAGE0->mem_free +
 317                                 PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT);
 318         reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text),
 319                         (unsigned long)(_end - _text), BOOTMEM_DEFAULT);
 320         reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
 321                         ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT),
 322                         BOOTMEM_DEFAULT);
 323
 324 #ifndef CONFIG_DISCONTIGMEM
 325
 326         /* reserve the holes */
 327
 328         for (i = 0; i < npmem_holes; i++) {
 329                 reserve_bootmem_node(NODE_DATA(0),
 330                                 (pmem_holes[i].start_pfn << PAGE_SHIFT),
 331                                 (pmem_holes[i].pages << PAGE_SHIFT),
 332                                 BOOTMEM_DEFAULT);
 333         }
 334 #endif
 335
 336 #ifdef CONFIG_BLK_DEV_INITRD
 337         if (initrd_start) {
 338                 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
 339                 if (__pa(initrd_start) < mem_max) {
 340                         unsigned long initrd_reserve;
 341
 342                         if (__pa(initrd_end) > mem_max) {
 343                                 initrd_reserve = mem_max - __pa(initrd_start);
 344                         } else {
 345                                 initrd_reserve = initrd_end - initrd_start;
 346                         }
 347                         initrd_below_start_ok = 1;
 348                         printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
 349
 350                         reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start),
 351                                         initrd_reserve, BOOTMEM_DEFAULT);
 352                 }
 353         }
 354 #endif
 355
 356         data_resource.start =  virt_to_phys(&data_start);
 357         data_resource.end = virt_to_phys(_end) - 1;
 358         code_resource.start = virt_to_phys(_text);
 359         code_resource.end = virt_to_phys(&data_start)-1;
 360
 361         /* We don't know which region the kernel will be in, so try
 362          * all of them.
 363          */
 364         for (i = 0; i < sysram_resource_count; i++) {
 365                 struct resource *res = &sysram_resources[i];
 366                 request_resource(res, &code_resource);
 367                 request_resource(res, &data_resource);
 368         }
 369         request_resource(&sysram_resources[0], &pdcdata_resource);
 370 }
 371
 372 void free_initmem(void)
 373 {
 374         unsigned long addr;
 375         unsigned long init_begin = (unsigned long)__init_begin;
 376         unsigned long init_end = (unsigned long)__init_end;
 377
 378 #ifdef CONFIG_DEBUG_KERNEL
 379         /* Attempt to catch anyone trying to execute code here
 380          * by filling the page with BRK insns.
 381          */
 382         memset((void *)init_begin, 0x00, init_end - init_begin);
 383         flush_icache_range(init_begin, init_end);
 384 #endif
 385
 386         /* align __init_begin and __init_end to page size,
 387            ignoring linker script where we might have tried to save RAM */
 388         init_begin = PAGE_ALIGN(init_begin);
 389         init_end = PAGE_ALIGN(init_end);
 390         for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) {
 391                 ClearPageReserved(virt_to_page(addr));
 392                 init_page_count(virt_to_page(addr));
 393                 free_page(addr);
 394                 num_physpages++;
 395                 totalram_pages++;
 396         }
 397
 398         /* set up a new led state on systems shipped LED State panel */
 399         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
 400
 401         printk(KERN_INFO "Freeing unused kernel memory: %luk freed\n",
 402                 (init_end - init_begin) >> 10);
 403 }
 404
 405
 406 #ifdef CONFIG_DEBUG_RODATA
 407 void mark_rodata_ro(void)
 408 {
 409         /* rodata memory was already mapped with KERNEL_RO access rights by
 410            pagetable_init() and map_pages(). No need to do additional stuff here */
 411         printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
 412                 (unsigned long)(__end_rodata - __start_rodata) >> 10);
 413 }
 414 #endif
 415
 416
 417 /*
 418  * Just an arbitrary offset to serve as a "hole" between mapping areas
 419  * (between top of physical memory and a potential pcxl dma mapping
 420  * area, and below the vmalloc mapping area).
 421  *
 422  * The current 32K value just means that there will be a 32K "hole"
 423  * between mapping areas. That means that  any out-of-bounds memory
 424  * accesses will hopefully be caught. The vmalloc() routines leaves
 425  * a hole of 4kB between each vmalloced area for the same reason.
 426  */
 427
 428  /* Leave room for gateway page expansion */
 429 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
 430 #error KERNEL_MAP_START is in gateway reserved region
 431 #endif
 432 #define MAP_START (KERNEL_MAP_START)
 433
 434 #define VM_MAP_OFFSET  (32*1024)
 435 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 436                                      & ~(VM_MAP_OFFSET-1)))
 437
 438 void *parisc_vmalloc_start __read_mostly;
 439 EXPORT_SYMBOL(parisc_vmalloc_start);
 440
 441 #ifdef CONFIG_PA11
 442 unsigned long pcxl_dma_start __read_mostly;
 443 #endif
 444
 445 void __init mem_init(void)
 446 {
 447         int codesize, reservedpages, datasize, initsize;
 448
 449         /* Do sanity checks on page table constants */
 450         BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
 451         BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
 452         BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
 453         BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
 454                         > BITS_PER_LONG);
 455
 456         high_memory = __va((max_pfn << PAGE_SHIFT));
 457
 458 #ifndef CONFIG_DISCONTIGMEM
 459         max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
 460         totalram_pages += free_all_bootmem();
 461 #else
 462         {
 463                 int i;
 464
 465                 for (i = 0; i < npmem_ranges; i++)
 466                         totalram_pages += free_all_bootmem_node(NODE_DATA(i));
 467         }
 468 #endif
 469
 470         codesize = (unsigned long)_etext - (unsigned long)_text;
 471         datasize = (unsigned long)_edata - (unsigned long)_etext;
 472         initsize = (unsigned long)__init_end - (unsigned long)__init_begin;
 473
 474         reservedpages = 0;
 475 {
 476         unsigned long pfn;
 477 #ifdef CONFIG_DISCONTIGMEM
 478         int i;
 479
 480         for (i = 0; i < npmem_ranges; i++) {
 481                 for (pfn = node_start_pfn(i); pfn < node_end_pfn(i); pfn++) {
 482                         if (PageReserved(pfn_to_page(pfn)))
 483                                 reservedpages++;
 484                 }
 485         }
 486 #else /* !CONFIG_DISCONTIGMEM */
 487         for (pfn = 0; pfn < max_pfn; pfn++) {
 488                 /*
 489                  * Only count reserved RAM pages
 490                  */
 491                 if (PageReserved(pfn_to_page(pfn)))
 492                         reservedpages++;
 493         }
 494 #endif
 495 }
 496
 497 #ifdef CONFIG_PA11
 498         if (hppa_dma_ops == &pcxl_dma_ops) {
 499                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
 500                 parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
 501                                                 + PCXL_DMA_MAP_SIZE);
 502         } else {
 503                 pcxl_dma_start = 0;
 504                 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
 505         }
 506 #else
 507         parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
 508 #endif
 509
 510         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
 511                 nr_free_pages() << (PAGE_SHIFT-10),
 512                 num_physpages << (PAGE_SHIFT-10),
 513                 codesize >> 10,
 514                 reservedpages << (PAGE_SHIFT-10),
 515                 datasize >> 10,
 516                 initsize >> 10
 517         );
 518
 519 #ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
 520         printk("virtual kernel memory layout:\n"
 521                "    vmalloc : 0x%p - 0x%p   (%4ld MB)\n"
 522                "    memory  : 0x%p - 0x%p   (%4ld MB)\n"
 523                "      .init : 0x%p - 0x%p   (%4ld kB)\n"
 524                "      .data : 0x%p - 0x%p   (%4ld kB)\n"
 525                "      .text : 0x%p - 0x%p   (%4ld kB)\n",
 526
 527                (void*)VMALLOC_START, (void*)VMALLOC_END,
 528                (VMALLOC_END - VMALLOC_START) >> 20,
 529
 530                __va(0), high_memory,
 531                ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
 532
 533                __init_begin, __init_end,
 534                ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
 535
 536                _etext, _edata,
 537                ((unsigned long)_edata - (unsigned long)_etext) >> 10,
 538
 539                _text, _etext,
 540                ((unsigned long)_etext - (unsigned long)_text) >> 10);
 541 #endif
 542 }
 543
 544 unsigned long *empty_zero_page __read_mostly;
 545 EXPORT_SYMBOL(empty_zero_page);
 546
 547 void show_mem(unsigned int filter)
 548 {
 549         int i,free = 0,total = 0,reserved = 0;
 550         int shared = 0, cached = 0;
 551
 552         printk(KERN_INFO "Mem-info:\n");
 553         show_free_areas();
 554 #ifndef CONFIG_DISCONTIGMEM
 555         i = max_mapnr;
 556         while (i-- > 0) {
 557                 total++;
 558                 if (PageReserved(mem_map+i))
 559                         reserved++;
 560                 else if (PageSwapCache(mem_map+i))
 561                         cached++;
 562                 else if (!page_count(&mem_map[i]))
 563                         free++;
 564                 else
 565                         shared += page_count(&mem_map[i]) - 1;
 566         }
 567 #else
 568         for (i = 0; i < npmem_ranges; i++) {
 569                 int j;
 570
 571                 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
 572                         struct page *p;
 573                         unsigned long flags;
 574
 575                         pgdat_resize_lock(NODE_DATA(i), &flags);
 576                         p = nid_page_nr(i, j) - node_start_pfn(i);
 577
 578                         total++;
 579                         if (PageReserved(p))
 580                                 reserved++;
 581                         else if (PageSwapCache(p))
 582                                 cached++;
 583                         else if (!page_count(p))
 584                                 free++;
 585                         else
 586                                 shared += page_count(p) - 1;
 587                         pgdat_resize_unlock(NODE_DATA(i), &flags);
 588                 }
 589         }
 590 #endif
 591         printk(KERN_INFO "%d pages of RAM\n", total);
 592         printk(KERN_INFO "%d reserved pages\n", reserved);
 593         printk(KERN_INFO "%d pages shared\n", shared);
 594         printk(KERN_INFO "%d pages swap cached\n", cached);
 595
 596
 597 #ifdef CONFIG_DISCONTIGMEM
 598         {
 599                 struct zonelist *zl;
 600                 int i, j;
 601
 602                 for (i = 0; i < npmem_ranges; i++) {
 603                         zl = node_zonelist(i, 0);
 604                         for (j = 0; j < MAX_NR_ZONES; j++) {
 605                                 struct zoneref *z;
 606                                 struct zone *zone;
 607
 608                                 printk("Zone list for zone %d on node %d: ", j, i);
 609                                 for_each_zone_zonelist(zone, z, zl, j)
 610                                         printk("[%d/%s] ", zone_to_nid(zone),
 611                                                                 zone->name);
 612                                 printk("\n");
 613                         }
 614                 }
 615         }
 616 #endif
 617 }
 618
 619
 620 static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot)
 621 {
 622         pgd_t *pg_dir;
 623         pmd_t *pmd;
 624         pte_t *pg_table;
 625         unsigned long end_paddr;
 626         unsigned long start_pmd;
 627         unsigned long start_pte;
 628         unsigned long tmp1;
 629         unsigned long tmp2;
 630         unsigned long address;
 631         unsigned long ro_start;
 632         unsigned long ro_end;
 633         unsigned long fv_addr;
 634         unsigned long gw_addr;
 635         extern const unsigned long fault_vector_20;
 636         extern void * const linux_gateway_page;
 637
 638         ro_start = __pa((unsigned long)_text);
 639         ro_end   = __pa((unsigned long)&data_start);
 640         fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
 641         gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
 642
 643         end_paddr = start_paddr + size;
 644
 645         pg_dir = pgd_offset_k(start_vaddr);
 646
 647 #if PTRS_PER_PMD == 1
 648         start_pmd = 0;
 649 #else
 650         start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 651 #endif
 652         start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 653
 654         address = start_paddr;
 655         while (address < end_paddr) {
 656 #if PTRS_PER_PMD == 1
 657                 pmd = (pmd_t *)__pa(pg_dir);
 658 #else
 659                 pmd = (pmd_t *)pgd_address(*pg_dir);
 660
 661                 /*
 662                  * pmd is physical at this point
 663                  */
 664
 665                 if (!pmd) {
 666                         pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER);
 667                         pmd = (pmd_t *) __pa(pmd);
 668                 }
 669
 670                 pgd_populate(NULL, pg_dir, __va(pmd));
 671 #endif
 672                 pg_dir++;
 673
 674                 /* now change pmd to kernel virtual addresses */
 675
 676                 pmd = (pmd_t *)__va(pmd) + start_pmd;
 677                 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) {
 678
 679                         /*
 680                          * pg_table is physical at this point
 681                          */
 682
 683                         pg_table = (pte_t *)pmd_address(*pmd);
 684                         if (!pg_table) {
 685                                 pg_table = (pte_t *)
 686                                         alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE);
 687                                 pg_table = (pte_t *) __pa(pg_table);
 688                         }
 689
 690                         pmd_populate_kernel(NULL, pmd, __va(pg_table));
 691
 692                         /* now change pg_table to kernel virtual addresses */
 693
 694                         pg_table = (pte_t *) __va(pg_table) + start_pte;
 695                         for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) {
 696                                 pte_t pte;
 697
 698                                 /*
 699                                  * Map the fault vector writable so we can
 700                                  * write the HPMC checksum.
 701                                  */
 702 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 703                                 if (address >= ro_start && address < ro_end
 704                                                         && address != fv_addr
 705                                                         && address != gw_addr)
 706                                     pte = __mk_pte(address, PAGE_KERNEL_RO);
 707                                 else
 708 #endif
 709                                     pte = __mk_pte(address, pgprot);
 710
 711                                 if (address >= end_paddr)
 712                                         pte_val(pte) = 0;
 713
 714                                 set_pte(pg_table, pte);
 715
 716                                 address += PAGE_SIZE;
 717                         }
 718                         start_pte = 0;
 719
 720                         if (address >= end_paddr)
 721                             break;
 722                 }
 723                 start_pmd = 0;
 724         }
 725 }
 726
 727 /*
 728  * pagetable_init() sets up the page tables
 729  *
 730  * Note that gateway_init() places the Linux gateway page at page 0.
 731  * Since gateway pages cannot be dereferenced this has the desirable
 732  * side effect of trapping those pesky NULL-reference errors in the
 733  * kernel.
 734  */
 735 static void __init pagetable_init(void)
 736 {
 737         int range;
 738
 739         /* Map each physical memory range to its kernel vaddr */
 740
 741         for (range = 0; range < npmem_ranges; range++) {
 742                 unsigned long start_paddr;
 743                 unsigned long end_paddr;
 744                 unsigned long size;
 745
 746                 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
 747                 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
 748                 size = pmem_ranges[range].pages << PAGE_SHIFT;
 749
 750                 map_pages((unsigned long)__va(start_paddr), start_paddr,
 751                         size, PAGE_KERNEL);
 752         }
 753
 754 #ifdef CONFIG_BLK_DEV_INITRD
 755         if (initrd_end && initrd_end > mem_limit) {
 756                 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
 757                 map_pages(initrd_start, __pa(initrd_start),
 758                         initrd_end - initrd_start, PAGE_KERNEL);
 759         }
 760 #endif
 761
 762         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
 763         memset(empty_zero_page, 0, PAGE_SIZE);
 764 }
 765
 766 static void __init gateway_init(void)
 767 {
 768         unsigned long linux_gateway_page_addr;
 769         /* FIXME: This is 'const' in order to trick the compiler
 770            into not treating it as DP-relative data. */
 771         extern void * const linux_gateway_page;
 772
 773         linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
 774
 775         /*
 776          * Setup Linux Gateway page.
 777          *
 778          * The Linux gateway page will reside in kernel space (on virtual
 779          * page 0), so it doesn't need to be aliased into user space.
 780          */
 781
 782         map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
 783                 PAGE_SIZE, PAGE_GATEWAY);
 784 }
 785
 786 #ifdef CONFIG_HPUX
 787 void
 788 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
 789 {
 790         pgd_t *pg_dir;
 791         pmd_t *pmd;
 792         pte_t *pg_table;
 793         unsigned long start_pmd;
 794         unsigned long start_pte;
 795         unsigned long address;
 796         unsigned long hpux_gw_page_addr;
 797         /* FIXME: This is 'const' in order to trick the compiler
 798            into not treating it as DP-relative data. */
 799         extern void * const hpux_gateway_page;
 800
 801         hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
 802
 803         /*
 804          * Setup HP-UX Gateway page.
 805          *
 806          * The HP-UX gateway page resides in the user address space,
 807          * so it needs to be aliased into each process.
 808          */
 809
 810         pg_dir = pgd_offset(mm,hpux_gw_page_addr);
 811
 812 #if PTRS_PER_PMD == 1
 813         start_pmd = 0;
 814 #else
 815         start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 816 #endif
 817         start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 818
 819         address = __pa(&hpux_gateway_page);
 820 #if PTRS_PER_PMD == 1
 821         pmd = (pmd_t *)__pa(pg_dir);
 822 #else
 823         pmd = (pmd_t *) pgd_address(*pg_dir);
 824
 825         /*
 826          * pmd is physical at this point
 827          */
 828
 829         if (!pmd) {
 830                 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
 831                 pmd = (pmd_t *) __pa(pmd);
 832         }
 833
 834         __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
 835 #endif
 836         /* now change pmd to kernel virtual addresses */
 837
 838         pmd = (pmd_t *)__va(pmd) + start_pmd;
 839
 840         /*
 841          * pg_table is physical at this point
 842          */
 843
 844         pg_table = (pte_t *) pmd_address(*pmd);
 845         if (!pg_table)
 846                 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
 847
 848         __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
 849
 850         /* now change pg_table to kernel virtual addresses */
 851
 852         pg_table = (pte_t *) __va(pg_table) + start_pte;
 853         set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
 854 }
 855 EXPORT_SYMBOL(map_hpux_gateway_page);
 856 #endif
 857
 858 void __init paging_init(void)
 859 {
 860         int i;
 861
 862         setup_bootmem();
 863         pagetable_init();
 864         gateway_init();
 865         flush_cache_all_local(); /* start with known state */
 866         flush_tlb_all_local(NULL);
 867
 868         for (i = 0; i < npmem_ranges; i++) {
 869                 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
 870
 871                 zones_size[ZONE_NORMAL] = pmem_ranges[i].pages;
 872
 873 #ifdef CONFIG_DISCONTIGMEM
 874                 /* Need to initialize the pfnnid_map before we can initialize
 875                    the zone */
 876                 {
 877                     int j;
 878                     for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
 879                          j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
 880                          j++) {
 881                         pfnnid_map[j] = i;
 882                     }
 883                 }
 884 #endif
 885
 886                 free_area_init_node(i, zones_size,
 887                                 pmem_ranges[i].start_pfn, NULL);
 888         }
 889 }
 890
 891 #ifdef CONFIG_PA20
 892
 893 /*
 894  * Currently, all PA20 chips have 18 bit protection IDs, which is the
 895  * limiting factor (space ids are 32 bits).
 896  */
 897
 898 #define NR_SPACE_IDS 262144
 899
 900 #else
 901
 902 /*
 903  * Currently we have a one-to-one relationship between space IDs and
 904  * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
 905  * support 15 bit protection IDs, so that is the limiting factor.
 906  * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
 907  * probably not worth the effort for a special case here.
 908  */
 909
 910 #define NR_SPACE_IDS 32768
 911
 912 #endif  /* !CONFIG_PA20 */
 913
 914 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
 915 #define SID_ARRAY_SIZE  (NR_SPACE_IDS / (8 * sizeof(long)))
 916
 917 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
 918 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
 919 static unsigned long space_id_index;
 920 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
 921 static unsigned long dirty_space_ids = 0;
 922
 923 static DEFINE_SPINLOCK(sid_lock);
 924
 925 unsigned long alloc_sid(void)
 926 {
 927         unsigned long index;
 928
 929         spin_lock(&sid_lock);
 930
 931         if (free_space_ids == 0) {
 932                 if (dirty_space_ids != 0) {
 933                         spin_unlock(&sid_lock);
 934                         flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
 935                         spin_lock(&sid_lock);
 936                 }
 937                 BUG_ON(free_space_ids == 0);
 938         }
 939
 940         free_space_ids--;
 941
 942         index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
 943         space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
 944         space_id_index = index;
 945
 946         spin_unlock(&sid_lock);
 947
 948         return index << SPACEID_SHIFT;
 949 }
 950
 951 void free_sid(unsigned long spaceid)
 952 {
 953         unsigned long index = spaceid >> SPACEID_SHIFT;
 954         unsigned long *dirty_space_offset;
 955
 956         dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
 957         index &= (BITS_PER_LONG - 1);
 958
 959         spin_lock(&sid_lock);
 960
 961         BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
 962
 963         *dirty_space_offset |= (1L << index);
 964         dirty_space_ids++;
 965
 966         spin_unlock(&sid_lock);
 967 }
 968
 969
 970 #ifdef CONFIG_SMP
 971 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
 972 {
 973         int i;
 974
 975         /* NOTE: sid_lock must be held upon entry */
 976
 977         *ndirtyptr = dirty_space_ids;
 978         if (dirty_space_ids != 0) {
 979             for (i = 0; i < SID_ARRAY_SIZE; i++) {
 980                 dirty_array[i] = dirty_space_id[i];
 981                 dirty_space_id[i] = 0;
 982             }
 983             dirty_space_ids = 0;
 984         }
 985
 986         return;
 987 }
 988
 989 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
 990 {
 991         int i;
 992
 993         /* NOTE: sid_lock must be held upon entry */
 994
 995         if (ndirty != 0) {
 996                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 997                         space_id[i] ^= dirty_array[i];
 998                 }
 999
1000                 free_space_ids += ndirty;
1001                 space_id_index = 0;
1002         }
1003 }
1004
1005 #else /* CONFIG_SMP */
1006
1007 static void recycle_sids(void)
1008 {
1009         int i;
1010
1011         /* NOTE: sid_lock must be held upon entry */
1012
1013         if (dirty_space_ids != 0) {
1014                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
1015                         space_id[i] ^= dirty_space_id[i];
1016                         dirty_space_id[i] = 0;
1017                 }
1018
1019                 free_space_ids += dirty_space_ids;
1020                 dirty_space_ids = 0;
1021                 space_id_index = 0;
1022         }
1023 }
1024 #endif
1025
1026 /*
1027  * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
1028  * purged, we can safely reuse the space ids that were released but
1029  * not flushed from the tlb.
1030  */
1031
1032 #ifdef CONFIG_SMP
1033
1034 static unsigned long recycle_ndirty;
1035 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
1036 static unsigned int recycle_inuse;
1037
1038 void flush_tlb_all(void)
1039 {
1040         int do_recycle;
1041
1042         do_recycle = 0;
1043         spin_lock(&sid_lock);
1044         if (dirty_space_ids > RECYCLE_THRESHOLD) {
1045             BUG_ON(recycle_inuse);  /* FIXME: Use a semaphore/wait queue here */
1046             get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
1047             recycle_inuse++;
1048             do_recycle++;
1049         }
1050         spin_unlock(&sid_lock);
1051         on_each_cpu(flush_tlb_all_local, NULL, 1);
1052         if (do_recycle) {
1053             spin_lock(&sid_lock);
1054             recycle_sids(recycle_ndirty,recycle_dirty_array);
1055             recycle_inuse = 0;
1056             spin_unlock(&sid_lock);
1057         }
1058 }
1059 #else
1060 void flush_tlb_all(void)
1061 {
1062         spin_lock(&sid_lock);
1063         flush_tlb_all_local(NULL);
1064         recycle_sids();
1065         spin_unlock(&sid_lock);
1066 }
1067 #endif
1068
1069 #ifdef CONFIG_BLK_DEV_INITRD
1070 void free_initrd_mem(unsigned long start, unsigned long end)
1071 {
1072         if (start >= end)
1073                 return;
1074         printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1075         for (; start < end; start += PAGE_SIZE) {
1076                 ClearPageReserved(virt_to_page(start));
1077                 init_page_count(virt_to_page(start));
1078                 free_page(start);
1079                 num_physpages++;
1080                 totalram_pages++;
1081         }
1082 }
1083 #endif