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/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
  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 = &bmem_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         if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) {
 309                 printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n");
 310                 BUG();
 311         }
 312
 313         /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
 314
 315 #define PDC_CONSOLE_IO_IODC_SIZE 32768
 316
 317         reserve_bootmem_node(NODE_DATA(0), 0UL,
 318                         (unsigned long)(PAGE0->mem_free +
 319                                 PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT);
 320         reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text),
 321                         (unsigned long)(_end - _text), BOOTMEM_DEFAULT);
 322         reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
 323                         ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT),
 324                         BOOTMEM_DEFAULT);
 325
 326 #ifndef CONFIG_DISCONTIGMEM
 327
 328         /* reserve the holes */
 329
 330         for (i = 0; i < npmem_holes; i++) {
 331                 reserve_bootmem_node(NODE_DATA(0),
 332                                 (pmem_holes[i].start_pfn << PAGE_SHIFT),
 333                                 (pmem_holes[i].pages << PAGE_SHIFT),
 334                                 BOOTMEM_DEFAULT);
 335         }
 336 #endif
 337
 338 #ifdef CONFIG_BLK_DEV_INITRD
 339         if (initrd_start) {
 340                 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
 341                 if (__pa(initrd_start) < mem_max) {
 342                         unsigned long initrd_reserve;
 343
 344                         if (__pa(initrd_end) > mem_max) {
 345                                 initrd_reserve = mem_max - __pa(initrd_start);
 346                         } else {
 347                                 initrd_reserve = initrd_end - initrd_start;
 348                         }
 349                         initrd_below_start_ok = 1;
 350                         printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
 351
 352                         reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start),
 353                                         initrd_reserve, BOOTMEM_DEFAULT);
 354                 }
 355         }
 356 #endif
 357
 358         data_resource.start =  virt_to_phys(&data_start);
 359         data_resource.end = virt_to_phys(_end) - 1;
 360         code_resource.start = virt_to_phys(_text);
 361         code_resource.end = virt_to_phys(&data_start)-1;
 362
 363         /* We don't know which region the kernel will be in, so try
 364          * all of them.
 365          */
 366         for (i = 0; i < sysram_resource_count; i++) {
 367                 struct resource *res = &sysram_resources[i];
 368                 request_resource(res, &code_resource);
 369                 request_resource(res, &data_resource);
 370         }
 371         request_resource(&sysram_resources[0], &pdcdata_resource);
 372 }
 373
 374 void free_initmem(void)
 375 {
 376         unsigned long addr, init_begin, init_end;
 377
 378         printk(KERN_INFO "Freeing unused kernel memory: ");
 379
 380 #ifdef CONFIG_DEBUG_KERNEL
 381         /* Attempt to catch anyone trying to execute code here
 382          * by filling the page with BRK insns.
 383          *
 384          * If we disable interrupts for all CPUs, then IPI stops working.
 385          * Kinda breaks the global cache flushing.
 386          */
 387         local_irq_disable();
 388
 389         memset(__init_begin, 0x00,
 390                 (unsigned long)__init_end - (unsigned long)__init_begin);
 391
 392         flush_data_cache();
 393         asm volatile("sync" : : );
 394         flush_icache_range((unsigned long)__init_begin, (unsigned long)__init_end);
 395         asm volatile("sync" : : );
 396
 397         local_irq_enable();
 398 #endif
 399
 400         /* align __init_begin and __init_end to page size,
 401            ignoring linker script where we might have tried to save RAM */
 402         init_begin = PAGE_ALIGN((unsigned long)(__init_begin));
 403         init_end   = PAGE_ALIGN((unsigned long)(__init_end));
 404         for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) {
 405                 ClearPageReserved(virt_to_page(addr));
 406                 init_page_count(virt_to_page(addr));
 407                 free_page(addr);
 408                 num_physpages++;
 409                 totalram_pages++;
 410         }
 411
 412         /* set up a new led state on systems shipped LED State panel */
 413         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
 414
 415         printk("%luk freed\n", (init_end - init_begin) >> 10);
 416 }
 417
 418
 419 #ifdef CONFIG_DEBUG_RODATA
 420 void mark_rodata_ro(void)
 421 {
 422         /* rodata memory was already mapped with KERNEL_RO access rights by
 423            pagetable_init() and map_pages(). No need to do additional stuff here */
 424         printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
 425                 (unsigned long)(__end_rodata - __start_rodata) >> 10);
 426 }
 427 #endif
 428
 429
 430 /*
 431  * Just an arbitrary offset to serve as a "hole" between mapping areas
 432  * (between top of physical memory and a potential pcxl dma mapping
 433  * area, and below the vmalloc mapping area).
 434  *
 435  * The current 32K value just means that there will be a 32K "hole"
 436  * between mapping areas. That means that  any out-of-bounds memory
 437  * accesses will hopefully be caught. The vmalloc() routines leaves
 438  * a hole of 4kB between each vmalloced area for the same reason.
 439  */
 440
 441  /* Leave room for gateway page expansion */
 442 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
 443 #error KERNEL_MAP_START is in gateway reserved region
 444 #endif
 445 #define MAP_START (KERNEL_MAP_START)
 446
 447 #define VM_MAP_OFFSET  (32*1024)
 448 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 449                                      & ~(VM_MAP_OFFSET-1)))
 450
 451 void *vmalloc_start __read_mostly;
 452 EXPORT_SYMBOL(vmalloc_start);
 453
 454 #ifdef CONFIG_PA11
 455 unsigned long pcxl_dma_start __read_mostly;
 456 #endif
 457
 458 void __init mem_init(void)
 459 {
 460         int codesize, reservedpages, datasize, initsize;
 461
 462         high_memory = __va((max_pfn << PAGE_SHIFT));
 463
 464 #ifndef CONFIG_DISCONTIGMEM
 465         max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
 466         totalram_pages += free_all_bootmem();
 467 #else
 468         {
 469                 int i;
 470
 471                 for (i = 0; i < npmem_ranges; i++)
 472                         totalram_pages += free_all_bootmem_node(NODE_DATA(i));
 473         }
 474 #endif
 475
 476         codesize = (unsigned long)_etext - (unsigned long)_text;
 477         datasize = (unsigned long)_edata - (unsigned long)_etext;
 478         initsize = (unsigned long)__init_end - (unsigned long)__init_begin;
 479
 480         reservedpages = 0;
 481 {
 482         unsigned long pfn;
 483 #ifdef CONFIG_DISCONTIGMEM
 484         int i;
 485
 486         for (i = 0; i < npmem_ranges; i++) {
 487                 for (pfn = node_start_pfn(i); pfn < node_end_pfn(i); pfn++) {
 488                         if (PageReserved(pfn_to_page(pfn)))
 489                                 reservedpages++;
 490                 }
 491         }
 492 #else /* !CONFIG_DISCONTIGMEM */
 493         for (pfn = 0; pfn < max_pfn; pfn++) {
 494                 /*
 495                  * Only count reserved RAM pages
 496                  */
 497                 if (PageReserved(pfn_to_page(pfn)))
 498                         reservedpages++;
 499         }
 500 #endif
 501 }
 502
 503 #ifdef CONFIG_PA11
 504         if (hppa_dma_ops == &pcxl_dma_ops) {
 505                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
 506                 vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE);
 507         } else {
 508                 pcxl_dma_start = 0;
 509                 vmalloc_start = SET_MAP_OFFSET(MAP_START);
 510         }
 511 #else
 512         vmalloc_start = SET_MAP_OFFSET(MAP_START);
 513 #endif
 514
 515         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
 516                 (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
 517                 num_physpages << (PAGE_SHIFT-10),
 518                 codesize >> 10,
 519                 reservedpages << (PAGE_SHIFT-10),
 520                 datasize >> 10,
 521                 initsize >> 10
 522         );
 523
 524 #ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
 525         printk("virtual kernel memory layout:\n"
 526                "    vmalloc : 0x%p - 0x%p   (%4ld MB)\n"
 527                "    memory  : 0x%p - 0x%p   (%4ld MB)\n"
 528                "      .init : 0x%p - 0x%p   (%4ld kB)\n"
 529                "      .data : 0x%p - 0x%p   (%4ld kB)\n"
 530                "      .text : 0x%p - 0x%p   (%4ld kB)\n",
 531
 532                (void*)VMALLOC_START, (void*)VMALLOC_END,
 533                (VMALLOC_END - VMALLOC_START) >> 20,
 534
 535                __va(0), high_memory,
 536                ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
 537
 538                __init_begin, __init_end,
 539                ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
 540
 541                _etext, _edata,
 542                ((unsigned long)_edata - (unsigned long)_etext) >> 10,
 543
 544                _text, _etext,
 545                ((unsigned long)_etext - (unsigned long)_text) >> 10);
 546 #endif
 547 }
 548
 549 unsigned long *empty_zero_page __read_mostly;
 550
 551 void show_mem(void)
 552 {
 553         int i,free = 0,total = 0,reserved = 0;
 554         int shared = 0, cached = 0;
 555
 556         printk(KERN_INFO "Mem-info:\n");
 557         show_free_areas();
 558         printk(KERN_INFO "Free swap:     %6ldkB\n",
 559                                 nr_swap_pages<<(PAGE_SHIFT-10));
 560 #ifndef CONFIG_DISCONTIGMEM
 561         i = max_mapnr;
 562         while (i-- > 0) {
 563                 total++;
 564                 if (PageReserved(mem_map+i))
 565                         reserved++;
 566                 else if (PageSwapCache(mem_map+i))
 567                         cached++;
 568                 else if (!page_count(&mem_map[i]))
 569                         free++;
 570                 else
 571                         shared += page_count(&mem_map[i]) - 1;
 572         }
 573 #else
 574         for (i = 0; i < npmem_ranges; i++) {
 575                 int j;
 576
 577                 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
 578                         struct page *p;
 579                         unsigned long flags;
 580
 581                         pgdat_resize_lock(NODE_DATA(i), &flags);
 582                         p = nid_page_nr(i, j) - node_start_pfn(i);
 583
 584                         total++;
 585                         if (PageReserved(p))
 586                                 reserved++;
 587                         else if (PageSwapCache(p))
 588                                 cached++;
 589                         else if (!page_count(p))
 590                                 free++;
 591                         else
 592                                 shared += page_count(p) - 1;
 593                         pgdat_resize_unlock(NODE_DATA(i), &flags);
 594                 }
 595         }
 596 #endif
 597         printk(KERN_INFO "%d pages of RAM\n", total);
 598         printk(KERN_INFO "%d reserved pages\n", reserved);
 599         printk(KERN_INFO "%d pages shared\n", shared);
 600         printk(KERN_INFO "%d pages swap cached\n", cached);
 601
 602
 603 #ifdef CONFIG_DISCONTIGMEM
 604         {
 605                 struct zonelist *zl;
 606                 int i, j, k;
 607
 608                 for (i = 0; i < npmem_ranges; i++) {
 609                         for (j = 0; j < MAX_NR_ZONES; j++) {
 610                                 zl = NODE_DATA(i)->node_zonelists + j;
 611
 612                                 printk("Zone list for zone %d on node %d: ", j, i);
 613                                 for (k = 0; zl->zones[k] != NULL; k++)
 614                                         printk("[%d/%s] ", zone_to_nid(zl->zones[k]), zl->zones[k]->name);
 615                                 printk("\n");
 616                         }
 617                 }
 618         }
 619 #endif
 620 }
 621
 622
 623 static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot)
 624 {
 625         pgd_t *pg_dir;
 626         pmd_t *pmd;
 627         pte_t *pg_table;
 628         unsigned long end_paddr;
 629         unsigned long start_pmd;
 630         unsigned long start_pte;
 631         unsigned long tmp1;
 632         unsigned long tmp2;
 633         unsigned long address;
 634         unsigned long ro_start;
 635         unsigned long ro_end;
 636         unsigned long fv_addr;
 637         unsigned long gw_addr;
 638         extern const unsigned long fault_vector_20;
 639         extern void * const linux_gateway_page;
 640
 641         ro_start = __pa((unsigned long)_text);
 642         ro_end   = __pa((unsigned long)&data_start);
 643         fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
 644         gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
 645
 646         end_paddr = start_paddr + size;
 647
 648         pg_dir = pgd_offset_k(start_vaddr);
 649
 650 #if PTRS_PER_PMD == 1
 651         start_pmd = 0;
 652 #else
 653         start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 654 #endif
 655         start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 656
 657         address = start_paddr;
 658         while (address < end_paddr) {
 659 #if PTRS_PER_PMD == 1
 660                 pmd = (pmd_t *)__pa(pg_dir);
 661 #else
 662                 pmd = (pmd_t *)pgd_address(*pg_dir);
 663
 664                 /*
 665                  * pmd is physical at this point
 666                  */
 667
 668                 if (!pmd) {
 669                         pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER);
 670                         pmd = (pmd_t *) __pa(pmd);
 671                 }
 672
 673                 pgd_populate(NULL, pg_dir, __va(pmd));
 674 #endif
 675                 pg_dir++;
 676
 677                 /* now change pmd to kernel virtual addresses */
 678
 679                 pmd = (pmd_t *)__va(pmd) + start_pmd;
 680                 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) {
 681
 682                         /*
 683                          * pg_table is physical at this point
 684                          */
 685
 686                         pg_table = (pte_t *)pmd_address(*pmd);
 687                         if (!pg_table) {
 688                                 pg_table = (pte_t *)
 689                                         alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE);
 690                                 pg_table = (pte_t *) __pa(pg_table);
 691                         }
 692
 693                         pmd_populate_kernel(NULL, pmd, __va(pg_table));
 694
 695                         /* now change pg_table to kernel virtual addresses */
 696
 697                         pg_table = (pte_t *) __va(pg_table) + start_pte;
 698                         for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) {
 699                                 pte_t pte;
 700
 701                                 /*
 702                                  * Map the fault vector writable so we can
 703                                  * write the HPMC checksum.
 704                                  */
 705 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 706                                 if (address >= ro_start && address < ro_end
 707                                                         && address != fv_addr
 708                                                         && address != gw_addr)
 709                                     pte = __mk_pte(address, PAGE_KERNEL_RO);
 710                                 else
 711 #endif
 712                                     pte = __mk_pte(address, pgprot);
 713
 714                                 if (address >= end_paddr)
 715                                         pte_val(pte) = 0;
 716
 717                                 set_pte(pg_table, pte);
 718
 719                                 address += PAGE_SIZE;
 720                         }
 721                         start_pte = 0;
 722
 723                         if (address >= end_paddr)
 724                             break;
 725                 }
 726                 start_pmd = 0;
 727         }
 728 }
 729
 730 /*
 731  * pagetable_init() sets up the page tables
 732  *
 733  * Note that gateway_init() places the Linux gateway page at page 0.
 734  * Since gateway pages cannot be dereferenced this has the desirable
 735  * side effect of trapping those pesky NULL-reference errors in the
 736  * kernel.
 737  */
 738 static void __init pagetable_init(void)
 739 {
 740         int range;
 741
 742         /* Map each physical memory range to its kernel vaddr */
 743
 744         for (range = 0; range < npmem_ranges; range++) {
 745                 unsigned long start_paddr;
 746                 unsigned long end_paddr;
 747                 unsigned long size;
 748
 749                 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
 750                 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
 751                 size = pmem_ranges[range].pages << PAGE_SHIFT;
 752
 753                 map_pages((unsigned long)__va(start_paddr), start_paddr,
 754                         size, PAGE_KERNEL);
 755         }
 756
 757 #ifdef CONFIG_BLK_DEV_INITRD
 758         if (initrd_end && initrd_end > mem_limit) {
 759                 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
 760                 map_pages(initrd_start, __pa(initrd_start),
 761                         initrd_end - initrd_start, PAGE_KERNEL);
 762         }
 763 #endif
 764
 765         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
 766         memset(empty_zero_page, 0, PAGE_SIZE);
 767 }
 768
 769 static void __init gateway_init(void)
 770 {
 771         unsigned long linux_gateway_page_addr;
 772         /* FIXME: This is 'const' in order to trick the compiler
 773            into not treating it as DP-relative data. */
 774         extern void * const linux_gateway_page;
 775
 776         linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
 777
 778         /*
 779          * Setup Linux Gateway page.
 780          *
 781          * The Linux gateway page will reside in kernel space (on virtual
 782          * page 0), so it doesn't need to be aliased into user space.
 783          */
 784
 785         map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
 786                 PAGE_SIZE, PAGE_GATEWAY);
 787 }
 788
 789 #ifdef CONFIG_HPUX
 790 void
 791 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
 792 {
 793         pgd_t *pg_dir;
 794         pmd_t *pmd;
 795         pte_t *pg_table;
 796         unsigned long start_pmd;
 797         unsigned long start_pte;
 798         unsigned long address;
 799         unsigned long hpux_gw_page_addr;
 800         /* FIXME: This is 'const' in order to trick the compiler
 801            into not treating it as DP-relative data. */
 802         extern void * const hpux_gateway_page;
 803
 804         hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
 805
 806         /*
 807          * Setup HP-UX Gateway page.
 808          *
 809          * The HP-UX gateway page resides in the user address space,
 810          * so it needs to be aliased into each process.
 811          */
 812
 813         pg_dir = pgd_offset(mm,hpux_gw_page_addr);
 814
 815 #if PTRS_PER_PMD == 1
 816         start_pmd = 0;
 817 #else
 818         start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 819 #endif
 820         start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 821
 822         address = __pa(&hpux_gateway_page);
 823 #if PTRS_PER_PMD == 1
 824         pmd = (pmd_t *)__pa(pg_dir);
 825 #else
 826         pmd = (pmd_t *) pgd_address(*pg_dir);
 827
 828         /*
 829          * pmd is physical at this point
 830          */
 831
 832         if (!pmd) {
 833                 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
 834                 pmd = (pmd_t *) __pa(pmd);
 835         }
 836
 837         __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
 838 #endif
 839         /* now change pmd to kernel virtual addresses */
 840
 841         pmd = (pmd_t *)__va(pmd) + start_pmd;
 842
 843         /*
 844          * pg_table is physical at this point
 845          */
 846
 847         pg_table = (pte_t *) pmd_address(*pmd);
 848         if (!pg_table)
 849                 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
 850
 851         __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
 852
 853         /* now change pg_table to kernel virtual addresses */
 854
 855         pg_table = (pte_t *) __va(pg_table) + start_pte;
 856         set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
 857 }
 858 EXPORT_SYMBOL(map_hpux_gateway_page);
 859 #endif
 860
 861 void __init paging_init(void)
 862 {
 863         int i;
 864
 865         setup_bootmem();
 866         pagetable_init();
 867         gateway_init();
 868         flush_cache_all_local(); /* start with known state */
 869         flush_tlb_all_local(NULL);
 870
 871         for (i = 0; i < npmem_ranges; i++) {
 872                 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
 873
 874                 zones_size[ZONE_NORMAL] = pmem_ranges[i].pages;
 875
 876 #ifdef CONFIG_DISCONTIGMEM
 877                 /* Need to initialize the pfnnid_map before we can initialize
 878                    the zone */
 879                 {
 880                     int j;
 881                     for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
 882                          j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
 883                          j++) {
 884                         pfnnid_map[j] = i;
 885                     }
 886                 }
 887 #endif
 888
 889                 free_area_init_node(i, NODE_DATA(i), zones_size,
 890                                 pmem_ranges[i].start_pfn, NULL);
 891         }
 892 }
 893
 894 #ifdef CONFIG_PA20
 895
 896 /*
 897  * Currently, all PA20 chips have 18 bit protection IDs, which is the
 898  * limiting factor (space ids are 32 bits).
 899  */
 900
 901 #define NR_SPACE_IDS 262144
 902
 903 #else
 904
 905 /*
 906  * Currently we have a one-to-one relationship between space IDs and
 907  * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
 908  * support 15 bit protection IDs, so that is the limiting factor.
 909  * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
 910  * probably not worth the effort for a special case here.
 911  */
 912
 913 #define NR_SPACE_IDS 32768
 914
 915 #endif  /* !CONFIG_PA20 */
 916
 917 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
 918 #define SID_ARRAY_SIZE  (NR_SPACE_IDS / (8 * sizeof(long)))
 919
 920 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
 921 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
 922 static unsigned long space_id_index;
 923 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
 924 static unsigned long dirty_space_ids = 0;
 925
 926 static DEFINE_SPINLOCK(sid_lock);
 927
 928 unsigned long alloc_sid(void)
 929 {
 930         unsigned long index;
 931
 932         spin_lock(&sid_lock);
 933
 934         if (free_space_ids == 0) {
 935                 if (dirty_space_ids != 0) {
 936                         spin_unlock(&sid_lock);
 937                         flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
 938                         spin_lock(&sid_lock);
 939                 }
 940                 BUG_ON(free_space_ids == 0);
 941         }
 942
 943         free_space_ids--;
 944
 945         index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
 946         space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
 947         space_id_index = index;
 948
 949         spin_unlock(&sid_lock);
 950
 951         return index << SPACEID_SHIFT;
 952 }
 953
 954 void free_sid(unsigned long spaceid)
 955 {
 956         unsigned long index = spaceid >> SPACEID_SHIFT;
 957         unsigned long *dirty_space_offset;
 958
 959         dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
 960         index &= (BITS_PER_LONG - 1);
 961
 962         spin_lock(&sid_lock);
 963
 964         BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
 965
 966         *dirty_space_offset |= (1L << index);
 967         dirty_space_ids++;
 968
 969         spin_unlock(&sid_lock);
 970 }
 971
 972
 973 #ifdef CONFIG_SMP
 974 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
 975 {
 976         int i;
 977
 978         /* NOTE: sid_lock must be held upon entry */
 979
 980         *ndirtyptr = dirty_space_ids;
 981         if (dirty_space_ids != 0) {
 982             for (i = 0; i < SID_ARRAY_SIZE; i++) {
 983                 dirty_array[i] = dirty_space_id[i];
 984                 dirty_space_id[i] = 0;
 985             }
 986             dirty_space_ids = 0;
 987         }
 988
 989         return;
 990 }
 991
 992 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
 993 {
 994         int i;
 995
 996         /* NOTE: sid_lock must be held upon entry */
 997
 998         if (ndirty != 0) {
 999                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
1000                         space_id[i] ^= dirty_array[i];
1001                 }
1002
1003                 free_space_ids += ndirty;
1004                 space_id_index = 0;
1005         }
1006 }
1007
1008 #else /* CONFIG_SMP */
1009
1010 static void recycle_sids(void)
1011 {
1012         int i;
1013
1014         /* NOTE: sid_lock must be held upon entry */
1015
1016         if (dirty_space_ids != 0) {
1017                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
1018                         space_id[i] ^= dirty_space_id[i];
1019                         dirty_space_id[i] = 0;
1020                 }
1021
1022                 free_space_ids += dirty_space_ids;
1023                 dirty_space_ids = 0;
1024                 space_id_index = 0;
1025         }
1026 }
1027 #endif
1028
1029 /*
1030  * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
1031  * purged, we can safely reuse the space ids that were released but
1032  * not flushed from the tlb.
1033  */
1034
1035 #ifdef CONFIG_SMP
1036
1037 static unsigned long recycle_ndirty;
1038 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
1039 static unsigned int recycle_inuse;
1040
1041 void flush_tlb_all(void)
1042 {
1043         int do_recycle;
1044
1045         do_recycle = 0;
1046         spin_lock(&sid_lock);
1047         if (dirty_space_ids > RECYCLE_THRESHOLD) {
1048             BUG_ON(recycle_inuse);  /* FIXME: Use a semaphore/wait queue here */
1049             get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
1050             recycle_inuse++;
1051             do_recycle++;
1052         }
1053         spin_unlock(&sid_lock);
1054         on_each_cpu(flush_tlb_all_local, NULL, 1, 1);
1055         if (do_recycle) {
1056             spin_lock(&sid_lock);
1057             recycle_sids(recycle_ndirty,recycle_dirty_array);
1058             recycle_inuse = 0;
1059             spin_unlock(&sid_lock);
1060         }
1061 }
1062 #else
1063 void flush_tlb_all(void)
1064 {
1065         spin_lock(&sid_lock);
1066         flush_tlb_all_local(NULL);
1067         recycle_sids();
1068         spin_unlock(&sid_lock);
1069 }
1070 #endif
1071
1072 #ifdef CONFIG_BLK_DEV_INITRD
1073 void free_initrd_mem(unsigned long start, unsigned long end)
1074 {
1075         if (start >= end)
1076                 return;
1077         printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1078         for (; start < end; start += PAGE_SIZE) {
1079                 ClearPageReserved(virt_to_page(start));
1080                 init_page_count(virt_to_page(start));
1081                 free_page(start);
1082                 num_physpages++;
1083                 totalram_pages++;
1084         }
1085 }
1086 #endif