arch/parisc/mm/init.c

   1 /*
   2  *  linux/arch/parisc/mm/init.c
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *  Copyright 1999 SuSE GmbH
   6  *    changed by Philipp Rumpf
   7  *  Copyright 1999 Philipp Rumpf (prumpf@tux.org)
   8  *  Copyright 2004 Randolph Chung (tausq@debian.org)
   9  *  Copyright 2006-2007 Helge Deller (deller@gmx.de)
  10  *
  11  */
  12
  13
  14 #include <linux/module.h>
  15 #include <linux/mm.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/gfp.h>
  18 #include <linux/delay.h>
  19 #include <linux/init.h>
  20 #include <linux/pci.h>          /* for hppa_dma_ops and pcxl_dma_ops */
  21 #include <linux/initrd.h>
  22 #include <linux/swap.h>
  23 #include <linux/unistd.h>
  24 #include <linux/nodemask.h>     /* for node_online_map */
  25 #include <linux/pagemap.h>      /* for release_pages and page_cache_release */
  26
  27 #include <asm/pgalloc.h>
  28 #include <asm/pgtable.h>
  29 #include <asm/tlb.h>
  30 #include <asm/pdc_chassis.h>
  31 #include <asm/mmzone.h>
  32 #include <asm/sections.h>
  33
  34 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  35
  36 extern int  data_start;
  37
  38 #ifdef CONFIG_DISCONTIGMEM
  39 struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
  40 unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
  41 #endif
  42
  43 static struct resource data_resource = {
  44         .name   = "Kernel data",
  45         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  46 };
  47
  48 static struct resource code_resource = {
  49         .name   = "Kernel code",
  50         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  51 };
  52
  53 static struct resource pdcdata_resource = {
  54         .name   = "PDC data (Page Zero)",
  55         .start  = 0,
  56         .end    = 0x9ff,
  57         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  58 };
  59
  60 static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
  61
  62 /* The following array is initialized from the firmware specific
  63  * information retrieved in kernel/inventory.c.
  64  */
  65
  66 physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
  67 int npmem_ranges __read_mostly;
  68
  69 #ifdef CONFIG_64BIT
  70 #define MAX_MEM         (~0UL)
  71 #else /* !CONFIG_64BIT */
  72 #define MAX_MEM         (3584U*1024U*1024U)
  73 #endif /* !CONFIG_64BIT */
  74
  75 static unsigned long mem_limit __read_mostly = MAX_MEM;
  76
  77 static void __init mem_limit_func(void)
  78 {
  79         char *cp, *end;
  80         unsigned long limit;
  81
  82         /* We need this before __setup() functions are called */
  83
  84         limit = MAX_MEM;
  85         for (cp = boot_command_line; *cp; ) {
  86                 if (memcmp(cp, "mem=", 4) == 0) {
  87                         cp += 4;
  88                         limit = memparse(cp, &end);
  89                         if (end != cp)
  90                                 break;
  91                         cp = end;
  92                 } else {
  93                         while (*cp != ' ' && *cp)
  94                                 ++cp;
  95                         while (*cp == ' ')
  96                                 ++cp;
  97                 }
  98         }
  99
 100         if (limit < mem_limit)
 101                 mem_limit = limit;
 102 }
 103
 104 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
 105
 106 static void __init setup_bootmem(void)
 107 {
 108         unsigned long bootmap_size;
 109         unsigned long mem_max;
 110         unsigned long bootmap_pages;
 111         unsigned long bootmap_start_pfn;
 112         unsigned long bootmap_pfn;
 113 #ifndef CONFIG_DISCONTIGMEM
 114         physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
 115         int npmem_holes;
 116 #endif
 117         int i, sysram_resource_count;
 118
 119         disable_sr_hashing(); /* Turn off space register hashing */
 120
 121         /*
 122          * Sort the ranges. Since the number of ranges is typically
 123          * small, and performance is not an issue here, just do
 124          * a simple insertion sort.
 125          */
 126
 127         for (i = 1; i < npmem_ranges; i++) {
 128                 int j;
 129
 130                 for (j = i; j > 0; j--) {
 131                         unsigned long tmp;
 132
 133                         if (pmem_ranges[j-1].start_pfn <
 134                             pmem_ranges[j].start_pfn) {
 135
 136                                 break;
 137                         }
 138                         tmp = pmem_ranges[j-1].start_pfn;
 139                         pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
 140                         pmem_ranges[j].start_pfn = tmp;
 141                         tmp = pmem_ranges[j-1].pages;
 142                         pmem_ranges[j-1].pages = pmem_ranges[j].pages;
 143                         pmem_ranges[j].pages = tmp;
 144                 }
 145         }
 146
 147 #ifndef CONFIG_DISCONTIGMEM
 148         /*
 149          * Throw out ranges that are too far apart (controlled by
 150          * MAX_GAP).
 151          */
 152
 153         for (i = 1; i < npmem_ranges; i++) {
 154                 if (pmem_ranges[i].start_pfn -
 155                         (pmem_ranges[i-1].start_pfn +
 156                          pmem_ranges[i-1].pages) > MAX_GAP) {
 157                         npmem_ranges = i;
 158                         printk("Large gap in memory detected (%ld pages). "
 159                                "Consider turning on CONFIG_DISCONTIGMEM\n",
 160                                pmem_ranges[i].start_pfn -
 161                                (pmem_ranges[i-1].start_pfn +
 162                                 pmem_ranges[i-1].pages));
 163                         break;
 164                 }
 165         }
 166 #endif
 167
 168         if (npmem_ranges > 1) {
 169
 170                 /* Print the memory ranges */
 171
 172                 printk(KERN_INFO "Memory Ranges:\n");
 173
 174                 for (i = 0; i < npmem_ranges; i++) {
 175                         unsigned long start;
 176                         unsigned long size;
 177
 178                         size = (pmem_ranges[i].pages << PAGE_SHIFT);
 179                         start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
 180                         printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
 181                                 i,start, start + (size - 1), size >> 20);
 182                 }
 183         }
 184
 185         sysram_resource_count = npmem_ranges;
 186         for (i = 0; i < sysram_resource_count; i++) {
 187                 struct resource *res = &sysram_resources[i];
 188                 res->name = "System RAM";
 189                 res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT;
 190                 res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1;
 191                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 192                 request_resource(&iomem_resource, res);
 193         }
 194
 195         /*
 196          * For 32 bit kernels we limit the amount of memory we can
 197          * support, in order to preserve enough kernel address space
 198          * for other purposes. For 64 bit kernels we don't normally
 199          * limit the memory, but this mechanism can be used to
 200          * artificially limit the amount of memory (and it is written
 201          * to work with multiple memory ranges).
 202          */
 203
 204         mem_limit_func();       /* check for "mem=" argument */
 205
 206         mem_max = 0;
 207         num_physpages = 0;
 208         for (i = 0; i < npmem_ranges; i++) {
 209                 unsigned long rsize;
 210
 211                 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
 212                 if ((mem_max + rsize) > mem_limit) {
 213                         printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
 214                         if (mem_max == mem_limit)
 215                                 npmem_ranges = i;
 216                         else {
 217                                 pmem_ranges[i].pages =   (mem_limit >> PAGE_SHIFT)
 218                                                        - (mem_max >> PAGE_SHIFT);
 219                                 npmem_ranges = i + 1;
 220                                 mem_max = mem_limit;
 221                         }
 222                 num_physpages += pmem_ranges[i].pages;
 223                         break;
 224                 }
 225             num_physpages += pmem_ranges[i].pages;
 226                 mem_max += rsize;
 227         }
 228
 229         printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
 230
 231 #ifndef CONFIG_DISCONTIGMEM
 232         /* Merge the ranges, keeping track of the holes */
 233
 234         {
 235                 unsigned long end_pfn;
 236                 unsigned long hole_pages;
 237
 238                 npmem_holes = 0;
 239                 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
 240                 for (i = 1; i < npmem_ranges; i++) {
 241
 242                         hole_pages = pmem_ranges[i].start_pfn - end_pfn;
 243                         if (hole_pages) {
 244                                 pmem_holes[npmem_holes].start_pfn = end_pfn;
 245                                 pmem_holes[npmem_holes++].pages = hole_pages;
 246                                 end_pfn += hole_pages;
 247                         }
 248                         end_pfn += pmem_ranges[i].pages;
 249                 }
 250
 251                 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
 252                 npmem_ranges = 1;
 253         }
 254 #endif
 255
 256         bootmap_pages = 0;
 257         for (i = 0; i < npmem_ranges; i++)
 258                 bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages);
 259
 260         bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT;
 261
 262 #ifdef CONFIG_DISCONTIGMEM
 263         for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
 264                 memset(NODE_DATA(i), 0, sizeof(pg_data_t));
 265                 NODE_DATA(i)->bdata = &bootmem_node_data[i];
 266         }
 267         memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
 268
 269         for (i = 0; i < npmem_ranges; i++) {
 270                 node_set_state(i, N_NORMAL_MEMORY);
 271                 node_set_online(i);
 272         }
 273 #endif
 274
 275         /*
 276          * Initialize and free the full range of memory in each range.
 277          * Note that the only writing these routines do are to the bootmap,
 278          * and we've made sure to locate the bootmap properly so that they
 279          * won't be writing over anything important.
 280          */
 281
 282         bootmap_pfn = bootmap_start_pfn;
 283         max_pfn = 0;
 284         for (i = 0; i < npmem_ranges; i++) {
 285                 unsigned long start_pfn;
 286                 unsigned long npages;
 287
 288                 start_pfn = pmem_ranges[i].start_pfn;
 289                 npages = pmem_ranges[i].pages;
 290
 291                 bootmap_size = init_bootmem_node(NODE_DATA(i),
 292                                                 bootmap_pfn,
 293                                                 start_pfn,
 294                                                 (start_pfn + npages) );
 295                 free_bootmem_node(NODE_DATA(i),
 296                                   (start_pfn << PAGE_SHIFT),
 297                                   (npages << PAGE_SHIFT) );
 298                 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 299                 if ((start_pfn + npages) > max_pfn)
 300                         max_pfn = start_pfn + npages;
 301         }
 302
 303         /* IOMMU is always used to access "high mem" on those boxes
 304          * that can support enough mem that a PCI device couldn't
 305          * directly DMA to any physical addresses.
 306          * ISA DMA support will need to revisit this.
 307          */
 308         max_low_pfn = max_pfn;
 309
 310         /* bootmap sizing messed up? */
 311         BUG_ON((bootmap_pfn - bootmap_start_pfn) != bootmap_pages);
 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;
 377         unsigned long init_begin = (unsigned long)__init_begin;
 378         unsigned long init_end = (unsigned long)__init_end;
 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         memset((void *)init_begin, 0x00, init_end - init_begin);
 385         flush_icache_range(init_begin, init_end);
 386 #endif
 387
 388         /* align __init_begin and __init_end to page size,
 389            ignoring linker script where we might have tried to save RAM */
 390         init_begin = PAGE_ALIGN(init_begin);
 391         init_end = PAGE_ALIGN(init_end);
 392         for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) {
 393                 ClearPageReserved(virt_to_page(addr));
 394                 init_page_count(virt_to_page(addr));
 395                 free_page(addr);
 396                 num_physpages++;
 397                 totalram_pages++;
 398         }
 399
 400         /* set up a new led state on systems shipped LED State panel */
 401         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
 402
 403         printk(KERN_INFO "Freeing unused kernel memory: %luk freed\n",
 404                 (init_end - init_begin) >> 10);
 405 }
 406
 407
 408 #ifdef CONFIG_DEBUG_RODATA
 409 void mark_rodata_ro(void)
 410 {
 411         /* rodata memory was already mapped with KERNEL_RO access rights by
 412            pagetable_init() and map_pages(). No need to do additional stuff here */
 413         printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
 414                 (unsigned long)(__end_rodata - __start_rodata) >> 10);
 415 }
 416 #endif
 417
 418
 419 /*
 420  * Just an arbitrary offset to serve as a "hole" between mapping areas
 421  * (between top of physical memory and a potential pcxl dma mapping
 422  * area, and below the vmalloc mapping area).
 423  *
 424  * The current 32K value just means that there will be a 32K "hole"
 425  * between mapping areas. That means that  any out-of-bounds memory
 426  * accesses will hopefully be caught. The vmalloc() routines leaves
 427  * a hole of 4kB between each vmalloced area for the same reason.
 428  */
 429
 430  /* Leave room for gateway page expansion */
 431 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
 432 #error KERNEL_MAP_START is in gateway reserved region
 433 #endif
 434 #define MAP_START (KERNEL_MAP_START)
 435
 436 #define VM_MAP_OFFSET  (32*1024)
 437 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 438                                      & ~(VM_MAP_OFFSET-1)))
 439
 440 void *parisc_vmalloc_start __read_mostly;
 441 EXPORT_SYMBOL(parisc_vmalloc_start);
 442
 443 #ifdef CONFIG_PA11
 444 unsigned long pcxl_dma_start __read_mostly;
 445 #endif
 446
 447 void __init mem_init(void)
 448 {
 449         int codesize, reservedpages, datasize, initsize;
 450
 451         /* Do sanity checks on page table constants */
 452         BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
 453         BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
 454         BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
 455         BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
 456                         > BITS_PER_LONG);
 457
 458         high_memory = __va((max_pfn << PAGE_SHIFT));
 459
 460 #ifndef CONFIG_DISCONTIGMEM
 461         max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
 462         totalram_pages += free_all_bootmem();
 463 #else
 464         {
 465                 int i;
 466
 467                 for (i = 0; i < npmem_ranges; i++)
 468                         totalram_pages += free_all_bootmem_node(NODE_DATA(i));
 469         }
 470 #endif
 471
 472         codesize = (unsigned long)_etext - (unsigned long)_text;
 473         datasize = (unsigned long)_edata - (unsigned long)_etext;
 474         initsize = (unsigned long)__init_end - (unsigned long)__init_begin;
 475
 476         reservedpages = 0;
 477 {
 478         unsigned long pfn;
 479 #ifdef CONFIG_DISCONTIGMEM
 480         int i;
 481
 482         for (i = 0; i < npmem_ranges; i++) {
 483                 for (pfn = node_start_pfn(i); pfn < node_end_pfn(i); pfn++) {
 484                         if (PageReserved(pfn_to_page(pfn)))
 485                                 reservedpages++;
 486                 }
 487         }
 488 #else /* !CONFIG_DISCONTIGMEM */
 489         for (pfn = 0; pfn < max_pfn; pfn++) {
 490                 /*
 491                  * Only count reserved RAM pages
 492                  */
 493                 if (PageReserved(pfn_to_page(pfn)))
 494                         reservedpages++;
 495         }
 496 #endif
 497 }
 498
 499 #ifdef CONFIG_PA11
 500         if (hppa_dma_ops == &pcxl_dma_ops) {
 501                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
 502                 parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
 503                                                 + PCXL_DMA_MAP_SIZE);
 504         } else {
 505                 pcxl_dma_start = 0;
 506                 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
 507         }
 508 #else
 509         parisc_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                 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 EXPORT_SYMBOL(empty_zero_page);
 548
 549 void show_mem(unsigned int filter)
 550 {
 551         int i,free = 0,total = 0,reserved = 0;
 552         int shared = 0, cached = 0;
 553
 554         printk(KERN_INFO "Mem-info:\n");
 555         show_free_areas();
 556 #ifndef CONFIG_DISCONTIGMEM
 557         i = max_mapnr;
 558         while (i-- > 0) {
 559                 total++;
 560                 if (PageReserved(mem_map+i))
 561                         reserved++;
 562                 else if (PageSwapCache(mem_map+i))
 563                         cached++;
 564                 else if (!page_count(&mem_map[i]))
 565                         free++;
 566                 else
 567                         shared += page_count(&mem_map[i]) - 1;
 568         }
 569 #else
 570         for (i = 0; i < npmem_ranges; i++) {
 571                 int j;
 572
 573                 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
 574                         struct page *p;
 575                         unsigned long flags;
 576
 577                         pgdat_resize_lock(NODE_DATA(i), &flags);
 578                         p = nid_page_nr(i, j) - node_start_pfn(i);
 579
 580                         total++;
 581                         if (PageReserved(p))
 582                                 reserved++;
 583                         else if (PageSwapCache(p))
 584                                 cached++;
 585                         else if (!page_count(p))
 586                                 free++;
 587                         else
 588                                 shared += page_count(p) - 1;
 589                         pgdat_resize_unlock(NODE_DATA(i), &flags);
 590                 }
 591         }
 592 #endif
 593         printk(KERN_INFO "%d pages of RAM\n", total);
 594         printk(KERN_INFO "%d reserved pages\n", reserved);
 595         printk(KERN_INFO "%d pages shared\n", shared);
 596         printk(KERN_INFO "%d pages swap cached\n", cached);
 597
 598
 599 #ifdef CONFIG_DISCONTIGMEM
 600         {
 601                 struct zonelist *zl;
 602                 int i, j;
 603
 604                 for (i = 0; i < npmem_ranges; i++) {
 605                         zl = node_zonelist(i, 0);
 606                         for (j = 0; j < MAX_NR_ZONES; j++) {
 607                                 struct zoneref *z;
 608                                 struct zone *zone;
 609
 610                                 printk("Zone list for zone %d on node %d: ", j, i);
 611                                 for_each_zone_zonelist(zone, z, zl, j)
 612                                         printk("[%d/%s] ", zone_to_nid(zone),
 613                                                                 zone->name);
 614                                 printk("\n");
 615                         }
 616                 }
 617         }
 618 #endif
 619 }
 620
 621
 622 static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot)
 623 {
 624         pgd_t *pg_dir;
 625         pmd_t *pmd;
 626         pte_t *pg_table;
 627         unsigned long end_paddr;
 628         unsigned long start_pmd;
 629         unsigned long start_pte;
 630         unsigned long tmp1;
 631         unsigned long tmp2;
 632         unsigned long address;
 633         unsigned long ro_start;
 634         unsigned long ro_end;
 635         unsigned long fv_addr;
 636         unsigned long gw_addr;
 637         extern const unsigned long fault_vector_20;
 638         extern void * const linux_gateway_page;
 639
 640         ro_start = __pa((unsigned long)_text);
 641         ro_end   = __pa((unsigned long)&data_start);
 642         fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
 643         gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
 644
 645         end_paddr = start_paddr + size;
 646
 647         pg_dir = pgd_offset_k(start_vaddr);
 648
 649 #if PTRS_PER_PMD == 1
 650         start_pmd = 0;
 651 #else
 652         start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 653 #endif
 654         start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 655
 656         address = start_paddr;
 657         while (address < end_paddr) {
 658 #if PTRS_PER_PMD == 1
 659                 pmd = (pmd_t *)__pa(pg_dir);
 660 #else
 661                 pmd = (pmd_t *)pgd_address(*pg_dir);
 662
 663                 /*
 664                  * pmd is physical at this point
 665                  */
 666
 667                 if (!pmd) {
 668                         pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER);
 669                         pmd = (pmd_t *) __pa(pmd);
 670                 }
 671
 672                 pgd_populate(NULL, pg_dir, __va(pmd));
 673 #endif
 674                 pg_dir++;
 675
 676                 /* now change pmd to kernel virtual addresses */
 677
 678                 pmd = (pmd_t *)__va(pmd) + start_pmd;
 679                 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) {
 680
 681                         /*
 682                          * pg_table is physical at this point
 683                          */
 684
 685                         pg_table = (pte_t *)pmd_address(*pmd);
 686                         if (!pg_table) {
 687                                 pg_table = (pte_t *)
 688                                         alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE);
 689                                 pg_table = (pte_t *) __pa(pg_table);
 690                         }
 691
 692                         pmd_populate_kernel(NULL, pmd, __va(pg_table));
 693
 694                         /* now change pg_table to kernel virtual addresses */
 695
 696                         pg_table = (pte_t *) __va(pg_table) + start_pte;
 697                         for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) {
 698                                 pte_t pte;
 699
 700                                 /*
 701                                  * Map the fault vector writable so we can
 702                                  * write the HPMC checksum.
 703                                  */
 704 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 705                                 if (address >= ro_start && address < ro_end
 706                                                         && address != fv_addr
 707                                                         && address != gw_addr)
 708                                     pte = __mk_pte(address, PAGE_KERNEL_RO);
 709                                 else
 710 #endif
 711                                     pte = __mk_pte(address, pgprot);
 712
 713                                 if (address >= end_paddr)
 714                                         pte_val(pte) = 0;
 715
 716                                 set_pte(pg_table, pte);
 717
 718                                 address += PAGE_SIZE;
 719                         }
 720                         start_pte = 0;
 721
 722                         if (address >= end_paddr)
 723                             break;
 724                 }
 725                 start_pmd = 0;
 726         }
 727 }
 728
 729 /*
 730  * pagetable_init() sets up the page tables
 731  *
 732  * Note that gateway_init() places the Linux gateway page at page 0.
 733  * Since gateway pages cannot be dereferenced this has the desirable
 734  * side effect of trapping those pesky NULL-reference errors in the
 735  * kernel.
 736  */
 737 static void __init pagetable_init(void)
 738 {
 739         int range;
 740
 741         /* Map each physical memory range to its kernel vaddr */
 742
 743         for (range = 0; range < npmem_ranges; range++) {
 744                 unsigned long start_paddr;
 745                 unsigned long end_paddr;
 746                 unsigned long size;
 747
 748                 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
 749                 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
 750                 size = pmem_ranges[range].pages << PAGE_SHIFT;
 751
 752                 map_pages((unsigned long)__va(start_paddr), start_paddr,
 753                         size, PAGE_KERNEL);
 754         }
 755
 756 #ifdef CONFIG_BLK_DEV_INITRD
 757         if (initrd_end && initrd_end > mem_limit) {
 758                 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
 759                 map_pages(initrd_start, __pa(initrd_start),
 760                         initrd_end - initrd_start, PAGE_KERNEL);
 761         }
 762 #endif
 763
 764         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
 765         memset(empty_zero_page, 0, PAGE_SIZE);
 766 }
 767
 768 static void __init gateway_init(void)
 769 {
 770         unsigned long linux_gateway_page_addr;
 771         /* FIXME: This is 'const' in order to trick the compiler
 772            into not treating it as DP-relative data. */
 773         extern void * const linux_gateway_page;
 774
 775         linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
 776
 777         /*
 778          * Setup Linux Gateway page.
 779          *
 780          * The Linux gateway page will reside in kernel space (on virtual
 781          * page 0), so it doesn't need to be aliased into user space.
 782          */
 783
 784         map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
 785                 PAGE_SIZE, PAGE_GATEWAY);
 786 }
 787
 788 #ifdef CONFIG_HPUX
 789 void
 790 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
 791 {
 792         pgd_t *pg_dir;
 793         pmd_t *pmd;
 794         pte_t *pg_table;
 795         unsigned long start_pmd;
 796         unsigned long start_pte;
 797         unsigned long address;
 798         unsigned long hpux_gw_page_addr;
 799         /* FIXME: This is 'const' in order to trick the compiler
 800            into not treating it as DP-relative data. */
 801         extern void * const hpux_gateway_page;
 802
 803         hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
 804
 805         /*
 806          * Setup HP-UX Gateway page.
 807          *
 808          * The HP-UX gateway page resides in the user address space,
 809          * so it needs to be aliased into each process.
 810          */
 811
 812         pg_dir = pgd_offset(mm,hpux_gw_page_addr);
 813
 814 #if PTRS_PER_PMD == 1
 815         start_pmd = 0;
 816 #else
 817         start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 818 #endif
 819         start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 820
 821         address = __pa(&hpux_gateway_page);
 822 #if PTRS_PER_PMD == 1
 823         pmd = (pmd_t *)__pa(pg_dir);
 824 #else
 825         pmd = (pmd_t *) pgd_address(*pg_dir);
 826
 827         /*
 828          * pmd is physical at this point
 829          */
 830
 831         if (!pmd) {
 832                 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
 833                 pmd = (pmd_t *) __pa(pmd);
 834         }
 835
 836         __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
 837 #endif
 838         /* now change pmd to kernel virtual addresses */
 839
 840         pmd = (pmd_t *)__va(pmd) + start_pmd;
 841
 842         /*
 843          * pg_table is physical at this point
 844          */
 845
 846         pg_table = (pte_t *) pmd_address(*pmd);
 847         if (!pg_table)
 848                 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
 849
 850         __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
 851
 852         /* now change pg_table to kernel virtual addresses */
 853
 854         pg_table = (pte_t *) __va(pg_table) + start_pte;
 855         set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
 856 }
 857 EXPORT_SYMBOL(map_hpux_gateway_page);
 858 #endif
 859
 860 void __init paging_init(void)
 861 {
 862         int i;
 863
 864         setup_bootmem();
 865         pagetable_init();
 866         gateway_init();
 867         flush_cache_all_local(); /* start with known state */
 868         flush_tlb_all_local(NULL);
 869
 870         for (i = 0; i < npmem_ranges; i++) {
 871                 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
 872
 873                 zones_size[ZONE_NORMAL] = 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, 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 IDs, 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 IDs and
 906  * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
 907  * support 15 bit protection IDs, so that is the limiting factor.
 908  * PCXT' has 18 bit protection IDs, 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);
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