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