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   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/delay.h>
  18 #include <linux/init.h>
  19 #include <linux/pci.h>          /* for hppa_dma_ops and pcxl_dma_ops */
  20 #include <linux/initrd.h>
  21 #include <linux/swap.h>
  22 #include <linux/unistd.h>
  23 #include <linux/nodemask.h>     /* for node_online_map */
  24 #include <linux/pagemap.h>      /* for release_pages and page_cache_release */
  25
  26 #include <asm/pgalloc.h>
  27 #include <asm/pgtable.h>
  28 #include <asm/tlb.h>
  29 #include <asm/pdc_chassis.h>
  30 #include <asm/mmzone.h>
  31 #include <asm/sections.h>
  32
  33 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  34
  35 extern int  data_start;
  36
  37 #ifdef CONFIG_DISCONTIGMEM
  38 struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
  39 bootmem_data_t bmem_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         extern char saved_command_line[];
  82
  83         /* We need this before __setup() functions are called */
  84
  85         limit = MAX_MEM;
  86         for (cp = saved_command_line; *cp; ) {
  87                 if (memcmp(cp, "mem=", 4) == 0) {
  88                         cp += 4;
  89                         limit = memparse(cp, &end);
  90                         if (end != cp)
  91                                 break;
  92                         cp = end;
  93                 } else {
  94                         while (*cp != ' ' && *cp)
  95                                 ++cp;
  96                         while (*cp == ' ')
  97                                 ++cp;
  98                 }
  99         }
 100
 101         if (limit < mem_limit)
 102                 mem_limit = limit;
 103 }
 104
 105 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
 106
 107 static void __init setup_bootmem(void)
 108 {
 109         unsigned long bootmap_size;
 110         unsigned long mem_max;
 111         unsigned long bootmap_pages;
 112         unsigned long bootmap_start_pfn;
 113         unsigned long bootmap_pfn;
 114 #ifndef CONFIG_DISCONTIGMEM
 115         physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
 116         int npmem_holes;
 117 #endif
 118         int i, sysram_resource_count;
 119
 120         disable_sr_hashing(); /* Turn off space register hashing */
 121
 122         /*
 123          * Sort the ranges. Since the number of ranges is typically
 124          * small, and performance is not an issue here, just do
 125          * a simple insertion sort.
 126          */
 127
 128         for (i = 1; i < npmem_ranges; i++) {
 129                 int j;
 130
 131                 for (j = i; j > 0; j--) {
 132                         unsigned long tmp;
 133
 134                         if (pmem_ranges[j-1].start_pfn <
 135                             pmem_ranges[j].start_pfn) {
 136
 137                                 break;
 138                         }
 139                         tmp = pmem_ranges[j-1].start_pfn;
 140                         pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
 141                         pmem_ranges[j].start_pfn = tmp;
 142                         tmp = pmem_ranges[j-1].pages;
 143                         pmem_ranges[j-1].pages = pmem_ranges[j].pages;
 144                         pmem_ranges[j].pages = tmp;
 145                 }
 146         }
 147
 148 #ifndef CONFIG_DISCONTIGMEM
 149         /*
 150          * Throw out ranges that are too far apart (controlled by
 151          * MAX_GAP).
 152          */
 153
 154         for (i = 1; i < npmem_ranges; i++) {
 155                 if (pmem_ranges[i].start_pfn -
 156                         (pmem_ranges[i-1].start_pfn +
 157                          pmem_ranges[i-1].pages) > MAX_GAP) {
 158                         npmem_ranges = i;
 159                         printk("Large gap in memory detected (%ld pages). "
 160                                "Consider turning on CONFIG_DISCONTIGMEM\n",
 161                                pmem_ranges[i].start_pfn -
 162                                (pmem_ranges[i-1].start_pfn +
 163                                 pmem_ranges[i-1].pages));
 164                         break;
 165                 }
 166         }
 167 #endif
 168
 169         if (npmem_ranges > 1) {
 170
 171                 /* Print the memory ranges */
 172
 173                 printk(KERN_INFO "Memory Ranges:\n");
 174
 175                 for (i = 0; i < npmem_ranges; i++) {
 176                         unsigned long start;
 177                         unsigned long size;
 178
 179                         size = (pmem_ranges[i].pages << PAGE_SHIFT);
 180                         start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
 181                         printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
 182                                 i,start, start + (size - 1), size >> 20);
 183                 }
 184         }
 185
 186         sysram_resource_count = npmem_ranges;
 187         for (i = 0; i < sysram_resource_count; i++) {
 188                 struct resource *res = &sysram_resources[i];
 189                 res->name = "System RAM";
 190                 res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT;
 191                 res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1;
 192                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 193                 request_resource(&iomem_resource, res);
 194         }
 195
 196         /*
 197          * For 32 bit kernels we limit the amount of memory we can
 198          * support, in order to preserve enough kernel address space
 199          * for other purposes. For 64 bit kernels we don't normally
 200          * limit the memory, but this mechanism can be used to
 201          * artificially limit the amount of memory (and it is written
 202          * to work with multiple memory ranges).
 203          */
 204
 205         mem_limit_func();       /* check for "mem=" argument */
 206
 207         mem_max = 0;
 208         num_physpages = 0;
 209         for (i = 0; i < npmem_ranges; i++) {
 210                 unsigned long rsize;
 211
 212                 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
 213                 if ((mem_max + rsize) > mem_limit) {
 214                         printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
 215                         if (mem_max == mem_limit)
 216                                 npmem_ranges = i;
 217                         else {
 218                                 pmem_ranges[i].pages =   (mem_limit >> PAGE_SHIFT)
 219                                                        - (mem_max >> PAGE_SHIFT);
 220                                 npmem_ranges = i + 1;
 221                                 mem_max = mem_limit;
 222                         }
 223                 num_physpages += pmem_ranges[i].pages;
 224                         break;
 225                 }
 226             num_physpages += pmem_ranges[i].pages;
 227                 mem_max += rsize;
 228         }
 229
 230         printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
 231
 232 #ifndef CONFIG_DISCONTIGMEM
 233         /* Merge the ranges, keeping track of the holes */
 234
 235         {
 236                 unsigned long end_pfn;
 237                 unsigned long hole_pages;
 238
 239                 npmem_holes = 0;
 240                 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
 241                 for (i = 1; i < npmem_ranges; i++) {
 242
 243                         hole_pages = pmem_ranges[i].start_pfn - end_pfn;
 244                         if (hole_pages) {
 245                                 pmem_holes[npmem_holes].start_pfn = end_pfn;
 246                                 pmem_holes[npmem_holes++].pages = hole_pages;
 247                                 end_pfn += hole_pages;
 248                         }
 249                         end_pfn += pmem_ranges[i].pages;
 250                 }
 251
 252                 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
 253                 npmem_ranges = 1;
 254         }
 255 #endif
 256
 257         bootmap_pages = 0;
 258         for (i = 0; i < npmem_ranges; i++)
 259                 bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages);
 260
 261         bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT;
 262
 263 #ifdef CONFIG_DISCONTIGMEM
 264         for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
 265                 memset(NODE_DATA(i), 0, sizeof(pg_data_t));
 266                 NODE_DATA(i)->bdata = &bmem_data[i];
 267         }
 268         memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
 269
 270         for (i = 0; i < npmem_ranges; i++)
 271                 node_set_online(i);
 272 #endif
 273
 274         /*
 275          * Initialize and free the full range of memory in each range.
 276          * Note that the only writing these routines do are to the bootmap,
 277          * and we've made sure to locate the bootmap properly so that they
 278          * won't be writing over anything important.
 279          */
 280
 281         bootmap_pfn = bootmap_start_pfn;
 282         max_pfn = 0;
 283         for (i = 0; i < npmem_ranges; i++) {
 284                 unsigned long start_pfn;
 285                 unsigned long npages;
 286
 287                 start_pfn = pmem_ranges[i].start_pfn;
 288                 npages = pmem_ranges[i].pages;
 289
 290                 bootmap_size = init_bootmem_node(NODE_DATA(i),
 291                                                 bootmap_pfn,
 292                                                 start_pfn,
 293                                                 (start_pfn + npages) );
 294                 free_bootmem_node(NODE_DATA(i),
 295                                   (start_pfn << PAGE_SHIFT),
 296                                   (npages << PAGE_SHIFT) );
 297                 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 298                 if ((start_pfn + npages) > max_pfn)
 299                         max_pfn = start_pfn + npages;
 300         }
 301
 302         /* IOMMU is always used to access "high mem" on those boxes
 303          * that can support enough mem that a PCI device couldn't
 304          * directly DMA to any physical addresses.
 305          * ISA DMA support will need to revisit this.
 306          */
 307         max_low_pfn = max_pfn;
 308
 309         if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) {
 310                 printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n");
 311                 BUG();
 312         }
 313
 314         /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
 315
 316 #define PDC_CONSOLE_IO_IODC_SIZE 32768
 317
 318         reserve_bootmem_node(NODE_DATA(0), 0UL,
 319                         (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE));
 320         reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text),
 321                         (unsigned long)(_end - _text));
 322         reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
 323                         ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT));
 324
 325 #ifndef CONFIG_DISCONTIGMEM
 326
 327         /* reserve the holes */
 328
 329         for (i = 0; i < npmem_holes; i++) {
 330                 reserve_bootmem_node(NODE_DATA(0),
 331                                 (pmem_holes[i].start_pfn << PAGE_SHIFT),
 332                                 (pmem_holes[i].pages << PAGE_SHIFT));
 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), initrd_reserve);
 351                 }
 352         }
 353 #endif
 354
 355         data_resource.start =  virt_to_phys(&data_start);
 356         data_resource.end = virt_to_phys(_end) - 1;
 357         code_resource.start = virt_to_phys(_text);
 358         code_resource.end = virt_to_phys(&data_start)-1;
 359
 360         /* We don't know which region the kernel will be in, so try
 361          * all of them.
 362          */
 363         for (i = 0; i < sysram_resource_count; i++) {
 364                 struct resource *res = &sysram_resources[i];
 365                 request_resource(res, &code_resource);
 366                 request_resource(res, &data_resource);
 367         }
 368         request_resource(&sysram_resources[0], &pdcdata_resource);
 369 }
 370
 371 void free_initmem(void)
 372 {
 373         unsigned long addr, init_begin, init_end;
 374
 375         printk(KERN_INFO "Freeing unused kernel memory: ");
 376
 377 #ifdef CONFIG_DEBUG_KERNEL
 378         /* Attempt to catch anyone trying to execute code here
 379          * by filling the page with BRK insns.
 380          *
 381          * If we disable interrupts for all CPUs, then IPI stops working.
 382          * Kinda breaks the global cache flushing.
 383          */
 384         local_irq_disable();
 385
 386         memset(__init_begin, 0x00,
 387                 (unsigned long)__init_end - (unsigned long)__init_begin);
 388
 389         flush_data_cache();
 390         asm volatile("sync" : : );
 391         flush_icache_range((unsigned long)__init_begin, (unsigned long)__init_end);
 392         asm volatile("sync" : : );
 393
 394         local_irq_enable();
 395 #endif
 396
 397         /* align __init_begin and __init_end to page size,
 398            ignoring linker script where we might have tried to save RAM */
 399         init_begin = PAGE_ALIGN((unsigned long)(__init_begin));
 400         init_end   = PAGE_ALIGN((unsigned long)(__init_end));
 401         for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) {
 402                 ClearPageReserved(virt_to_page(addr));
 403                 init_page_count(virt_to_page(addr));
 404                 free_page(addr);
 405                 num_physpages++;
 406                 totalram_pages++;
 407         }
 408
 409         /* set up a new led state on systems shipped LED State panel */
 410         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
 411
 412         printk("%luk freed\n", (init_end - init_begin) >> 10);
 413 }
 414
 415
 416 #ifdef CONFIG_DEBUG_RODATA
 417 void mark_rodata_ro(void)
 418 {
 419         /* rodata memory was already mapped with KERNEL_RO access rights by
 420            pagetable_init() and map_pages(). No need to do additional stuff here */
 421         printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
 422                 (unsigned long)(__end_rodata - __start_rodata) >> 10);
 423 }
 424 #endif
 425
 426
 427 /*
 428  * Just an arbitrary offset to serve as a "hole" between mapping areas
 429  * (between top of physical memory and a potential pcxl dma mapping
 430  * area, and below the vmalloc mapping area).
 431  *
 432  * The current 32K value just means that there will be a 32K "hole"
 433  * between mapping areas. That means that  any out-of-bounds memory
 434  * accesses will hopefully be caught. The vmalloc() routines leaves
 435  * a hole of 4kB between each vmalloced area for the same reason.
 436  */
 437
 438  /* Leave room for gateway page expansion */
 439 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
 440 #error KERNEL_MAP_START is in gateway reserved region
 441 #endif
 442 #define MAP_START (KERNEL_MAP_START)
 443
 444 #define VM_MAP_OFFSET  (32*1024)
 445 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 446                                      & ~(VM_MAP_OFFSET-1)))
 447
 448 void *vmalloc_start __read_mostly;
 449 EXPORT_SYMBOL(vmalloc_start);
 450
 451 #ifdef CONFIG_PA11
 452 unsigned long pcxl_dma_start __read_mostly;
 453 #endif
 454
 455 void __init mem_init(void)
 456 {
 457         int codesize, reservedpages, datasize, initsize;
 458
 459         high_memory = __va((max_pfn << PAGE_SHIFT));
 460
 461 #ifndef CONFIG_DISCONTIGMEM
 462         max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
 463         totalram_pages += free_all_bootmem();
 464 #else
 465         {
 466                 int i;
 467
 468                 for (i = 0; i < npmem_ranges; i++)
 469                         totalram_pages += free_all_bootmem_node(NODE_DATA(i));
 470         }
 471 #endif
 472
 473         codesize = (unsigned long)_etext - (unsigned long)_text;
 474         datasize = (unsigned long)_edata - (unsigned long)_etext;
 475         initsize = (unsigned long)__init_end - (unsigned long)__init_begin;
 476
 477         reservedpages = 0;
 478 {
 479         unsigned long pfn;
 480 #ifdef CONFIG_DISCONTIGMEM
 481         int i;
 482
 483         for (i = 0; i < npmem_ranges; i++) {
 484                 for (pfn = node_start_pfn(i); pfn < node_end_pfn(i); pfn++) {
 485                         if (PageReserved(pfn_to_page(pfn)))
 486                                 reservedpages++;
 487                 }
 488         }
 489 #else /* !CONFIG_DISCONTIGMEM */
 490         for (pfn = 0; pfn < max_pfn; pfn++) {
 491                 /*
 492                  * Only count reserved RAM pages
 493                  */
 494                 if (PageReserved(pfn_to_page(pfn)))
 495                         reservedpages++;
 496         }
 497 #endif
 498 }
 499
 500 #ifdef CONFIG_PA11
 501         if (hppa_dma_ops == &pcxl_dma_ops) {
 502                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
 503                 vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE);
 504         } else {
 505                 pcxl_dma_start = 0;
 506                 vmalloc_start = SET_MAP_OFFSET(MAP_START);
 507         }
 508 #else
 509         vmalloc_start = SET_MAP_OFFSET(MAP_START);
 510 #endif
 511
 512         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
 513                 (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
 514                 num_physpages << (PAGE_SHIFT-10),
 515                 codesize >> 10,
 516                 reservedpages << (PAGE_SHIFT-10),
 517                 datasize >> 10,
 518                 initsize >> 10
 519         );
 520
 521 #ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
 522         printk("virtual kernel memory layout:\n"
 523                "    vmalloc : 0x%p - 0x%p   (%4ld MB)\n"
 524                "    memory  : 0x%p - 0x%p   (%4ld MB)\n"
 525                "      .init : 0x%p - 0x%p   (%4ld kB)\n"
 526                "      .data : 0x%p - 0x%p   (%4ld kB)\n"
 527                "      .text : 0x%p - 0x%p   (%4ld kB)\n",
 528
 529                (void*)VMALLOC_START, (void*)VMALLOC_END,
 530                (VMALLOC_END - VMALLOC_START) >> 20,
 531
 532                __va(0), high_memory,
 533                ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
 534
 535                __init_begin, __init_end,
 536                ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
 537
 538                _etext, _edata,
 539                ((unsigned long)_edata - (unsigned long)_etext) >> 10,
 540
 541                _text, _etext,
 542                ((unsigned long)_etext - (unsigned long)_text) >> 10);
 543 #endif
 544 }
 545
 546 unsigned long *empty_zero_page __read_mostly;
 547
 548 void show_mem(void)
 549 {
 550         int i,free = 0,total = 0,reserved = 0;
 551         int shared = 0, cached = 0;
 552
 553         printk(KERN_INFO "Mem-info:\n");
 554         show_free_areas();
 555         printk(KERN_INFO "Free swap:     %6ldkB\n",
 556                                 nr_swap_pages<<(PAGE_SHIFT-10));
 557 #ifndef CONFIG_DISCONTIGMEM
 558         i = max_mapnr;
 559         while (i-- > 0) {
 560                 total++;
 561                 if (PageReserved(mem_map+i))
 562                         reserved++;
 563                 else if (PageSwapCache(mem_map+i))
 564                         cached++;
 565                 else if (!page_count(&mem_map[i]))
 566                         free++;
 567                 else
 568                         shared += page_count(&mem_map[i]) - 1;
 569         }
 570 #else
 571         for (i = 0; i < npmem_ranges; i++) {
 572                 int j;
 573
 574                 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
 575                         struct page *p;
 576                         unsigned long flags;
 577
 578                         pgdat_resize_lock(NODE_DATA(i), &flags);
 579                         p = nid_page_nr(i, j) - node_start_pfn(i);
 580
 581                         total++;
 582                         if (PageReserved(p))
 583                                 reserved++;
 584                         else if (PageSwapCache(p))
 585                                 cached++;
 586                         else if (!page_count(p))
 587                                 free++;
 588                         else
 589                                 shared += page_count(p) - 1;
 590                         pgdat_resize_unlock(NODE_DATA(i), &flags);
 591                 }
 592         }
 593 #endif
 594         printk(KERN_INFO "%d pages of RAM\n", total);
 595         printk(KERN_INFO "%d reserved pages\n", reserved);
 596         printk(KERN_INFO "%d pages shared\n", shared);
 597         printk(KERN_INFO "%d pages swap cached\n", cached);
 598
 599
 600 #ifdef CONFIG_DISCONTIGMEM
 601         {
 602                 struct zonelist *zl;
 603                 int i, j, k;
 604
 605                 for (i = 0; i < npmem_ranges; i++) {
 606                         for (j = 0; j < MAX_NR_ZONES; j++) {
 607                                 zl = NODE_DATA(i)->node_zonelists + j;
 608
 609                                 printk("Zone list for zone %d on node %d: ", j, i);
 610                                 for (k = 0; zl->zones[k] != NULL; k++)
 611                                         printk("[%ld/%s] ", zone_to_nid(zl->zones[k]), zl->zones[k]->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                 /* We have an IOMMU, so all memory can go into a single
 872                    ZONE_DMA zone. */
 873                 zones_size[ZONE_DMA] = pmem_ranges[i].pages;
 874
 875 #ifdef CONFIG_DISCONTIGMEM
 876                 /* Need to initialize the pfnnid_map before we can initialize
 877                    the zone */
 878                 {
 879                     int j;
 880                     for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
 881                          j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
 882                          j++) {
 883                         pfnnid_map[j] = i;
 884                     }
 885                 }
 886 #endif
 887
 888                 free_area_init_node(i, NODE_DATA(i), zones_size,
 889                                 pmem_ranges[i].start_pfn, NULL);
 890         }
 891 }
 892
 893 #ifdef CONFIG_PA20
 894
 895 /*
 896  * Currently, all PA20 chips have 18 bit protection id's, which is the
 897  * limiting factor (space ids are 32 bits).
 898  */
 899
 900 #define NR_SPACE_IDS 262144
 901
 902 #else
 903
 904 /*
 905  * Currently we have a one-to-one relationship between space id's and
 906  * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
 907  * support 15 bit protection id's, so that is the limiting factor.
 908  * PCXT' has 18 bit protection id's, but only 16 bit spaceids, so it's
 909  * probably not worth the effort for a special case here.
 910  */
 911
 912 #define NR_SPACE_IDS 32768
 913
 914 #endif  /* !CONFIG_PA20 */
 915
 916 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
 917 #define SID_ARRAY_SIZE  (NR_SPACE_IDS / (8 * sizeof(long)))
 918
 919 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
 920 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
 921 static unsigned long space_id_index;
 922 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
 923 static unsigned long dirty_space_ids = 0;
 924
 925 static DEFINE_SPINLOCK(sid_lock);
 926
 927 unsigned long alloc_sid(void)
 928 {
 929         unsigned long index;
 930
 931         spin_lock(&sid_lock);
 932
 933         if (free_space_ids == 0) {
 934                 if (dirty_space_ids != 0) {
 935                         spin_unlock(&sid_lock);
 936                         flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
 937                         spin_lock(&sid_lock);
 938                 }
 939                 BUG_ON(free_space_ids == 0);
 940         }
 941
 942         free_space_ids--;
 943
 944         index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
 945         space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
 946         space_id_index = index;
 947
 948         spin_unlock(&sid_lock);
 949
 950         return index << SPACEID_SHIFT;
 951 }
 952
 953 void free_sid(unsigned long spaceid)
 954 {
 955         unsigned long index = spaceid >> SPACEID_SHIFT;
 956         unsigned long *dirty_space_offset;
 957
 958         dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
 959         index &= (BITS_PER_LONG - 1);
 960
 961         spin_lock(&sid_lock);
 962
 963         BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
 964
 965         *dirty_space_offset |= (1L << index);
 966         dirty_space_ids++;
 967
 968         spin_unlock(&sid_lock);
 969 }
 970
 971
 972 #ifdef CONFIG_SMP
 973 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
 974 {
 975         int i;
 976
 977         /* NOTE: sid_lock must be held upon entry */
 978
 979         *ndirtyptr = dirty_space_ids;
 980         if (dirty_space_ids != 0) {
 981             for (i = 0; i < SID_ARRAY_SIZE; i++) {
 982                 dirty_array[i] = dirty_space_id[i];
 983                 dirty_space_id[i] = 0;
 984             }
 985             dirty_space_ids = 0;
 986         }
 987
 988         return;
 989 }
 990
 991 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
 992 {
 993         int i;
 994
 995         /* NOTE: sid_lock must be held upon entry */
 996
 997         if (ndirty != 0) {
 998                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 999                         space_id[i] ^= dirty_array[i];
1000                 }
1001
1002                 free_space_ids += ndirty;
1003                 space_id_index = 0;
1004         }
1005 }
1006
1007 #else /* CONFIG_SMP */
1008
1009 static void recycle_sids(void)
1010 {
1011         int i;
1012
1013         /* NOTE: sid_lock must be held upon entry */
1014
1015         if (dirty_space_ids != 0) {
1016                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
1017                         space_id[i] ^= dirty_space_id[i];
1018                         dirty_space_id[i] = 0;
1019                 }
1020
1021                 free_space_ids += dirty_space_ids;
1022                 dirty_space_ids = 0;
1023                 space_id_index = 0;
1024         }
1025 }
1026 #endif
1027
1028 /*
1029  * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
1030  * purged, we can safely reuse the space ids that were released but
1031  * not flushed from the tlb.
1032  */
1033
1034 #ifdef CONFIG_SMP
1035
1036 static unsigned long recycle_ndirty;
1037 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
1038 static unsigned int recycle_inuse;
1039
1040 void flush_tlb_all(void)
1041 {
1042         int do_recycle;
1043
1044         do_recycle = 0;
1045         spin_lock(&sid_lock);
1046         if (dirty_space_ids > RECYCLE_THRESHOLD) {
1047             BUG_ON(recycle_inuse);  /* FIXME: Use a semaphore/wait queue here */
1048             get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
1049             recycle_inuse++;
1050             do_recycle++;
1051         }
1052         spin_unlock(&sid_lock);
1053         on_each_cpu(flush_tlb_all_local, NULL, 1, 1);
1054         if (do_recycle) {
1055             spin_lock(&sid_lock);
1056             recycle_sids(recycle_ndirty,recycle_dirty_array);
1057             recycle_inuse = 0;
1058             spin_unlock(&sid_lock);
1059         }
1060 }
1061 #else
1062 void flush_tlb_all(void)
1063 {
1064         spin_lock(&sid_lock);
1065         flush_tlb_all_local(NULL);
1066         recycle_sids();
1067         spin_unlock(&sid_lock);
1068 }
1069 #endif
1070
1071 #ifdef CONFIG_BLK_DEV_INITRD
1072 void free_initrd_mem(unsigned long start, unsigned long end)
1073 {
1074         if (start >= end)
1075                 return;
1076         printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1077         for (; start < end; start += PAGE_SIZE) {
1078                 ClearPageReserved(virt_to_page(start));
1079                 init_page_count(virt_to_page(start));
1080                 free_page(start);
1081                 num_physpages++;
1082                 totalram_pages++;
1083         }
1084 }
1085 #endif