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   1 /*
   2  *  linux/arch/parisc/mm/init.c
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *  Copyright 1999 SuSE GmbH
   6  *    changed by Philipp Rumpf
   7  *  Copyright 1999 Philipp Rumpf (prumpf@tux.org)
   8  *  Copyright 2004 Randolph Chung (tausq@debian.org)
   9  *  Copyright 2006-2007 Helge Deller (deller@gmx.de)
  10  *
  11  */
  12
  13
  14 #include <linux/module.h>
  15 #include <linux/mm.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/delay.h>
  18 #include <linux/init.h>
  19 #include <linux/pci.h>          /* for hppa_dma_ops and pcxl_dma_ops */
  20 #include <linux/initrd.h>
  21 #include <linux/swap.h>
  22 #include <linux/unistd.h>
  23 #include <linux/nodemask.h>     /* for node_online_map */
  24 #include <linux/pagemap.h>      /* for release_pages and page_cache_release */
  25
  26 #include <asm/pgalloc.h>
  27 #include <asm/pgtable.h>
  28 #include <asm/tlb.h>
  29 #include <asm/pdc_chassis.h>
  30 #include <asm/mmzone.h>
  31 #include <asm/sections.h>
  32
  33 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  34
  35 extern int  data_start;
  36
  37 #ifdef CONFIG_DISCONTIGMEM
  38 struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
  39 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         if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) {
 308                 printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n");
 309                 BUG();
 310         }
 311
 312         /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
 313
 314 #define PDC_CONSOLE_IO_IODC_SIZE 32768
 315
 316         reserve_bootmem_node(NODE_DATA(0), 0UL,
 317                         (unsigned long)(PAGE0->mem_free +
 318                                 PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT);
 319         reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text),
 320                         (unsigned long)(_end - _text), BOOTMEM_DEFAULT);
 321         reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
 322                         ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT),
 323                         BOOTMEM_DEFAULT);
 324
 325 #ifndef CONFIG_DISCONTIGMEM
 326
 327         /* reserve the holes */
 328
 329         for (i = 0; i < npmem_holes; i++) {
 330                 reserve_bootmem_node(NODE_DATA(0),
 331                                 (pmem_holes[i].start_pfn << PAGE_SHIFT),
 332                                 (pmem_holes[i].pages << PAGE_SHIFT),
 333                                 BOOTMEM_DEFAULT);
 334         }
 335 #endif
 336
 337 #ifdef CONFIG_BLK_DEV_INITRD
 338         if (initrd_start) {
 339                 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
 340                 if (__pa(initrd_start) < mem_max) {
 341                         unsigned long initrd_reserve;
 342
 343                         if (__pa(initrd_end) > mem_max) {
 344                                 initrd_reserve = mem_max - __pa(initrd_start);
 345                         } else {
 346                                 initrd_reserve = initrd_end - initrd_start;
 347                         }
 348                         initrd_below_start_ok = 1;
 349                         printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
 350
 351                         reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start),
 352                                         initrd_reserve, BOOTMEM_DEFAULT);
 353                 }
 354         }
 355 #endif
 356
 357         data_resource.start =  virt_to_phys(&data_start);
 358         data_resource.end = virt_to_phys(_end) - 1;
 359         code_resource.start = virt_to_phys(_text);
 360         code_resource.end = virt_to_phys(&data_start)-1;
 361
 362         /* We don't know which region the kernel will be in, so try
 363          * all of them.
 364          */
 365         for (i = 0; i < sysram_resource_count; i++) {
 366                 struct resource *res = &sysram_resources[i];
 367                 request_resource(res, &code_resource);
 368                 request_resource(res, &data_resource);
 369         }
 370         request_resource(&sysram_resources[0], &pdcdata_resource);
 371 }
 372
 373 void free_initmem(void)
 374 {
 375         unsigned long addr, init_begin, init_end;
 376
 377         printk(KERN_INFO "Freeing unused kernel memory: ");
 378
 379 #ifdef CONFIG_DEBUG_KERNEL
 380         /* Attempt to catch anyone trying to execute code here
 381          * by filling the page with BRK insns.
 382          *
 383          * If we disable interrupts for all CPUs, then IPI stops working.
 384          * Kinda breaks the global cache flushing.
 385          */
 386         local_irq_disable();
 387
 388         memset(__init_begin, 0x00,
 389                 (unsigned long)__init_end - (unsigned long)__init_begin);
 390
 391         flush_data_cache();
 392         asm volatile("sync" : : );
 393         flush_icache_range((unsigned long)__init_begin, (unsigned long)__init_end);
 394         asm volatile("sync" : : );
 395
 396         local_irq_enable();
 397 #endif
 398
 399         /* align __init_begin and __init_end to page size,
 400            ignoring linker script where we might have tried to save RAM */
 401         init_begin = PAGE_ALIGN((unsigned long)(__init_begin));
 402         init_end   = PAGE_ALIGN((unsigned long)(__init_end));
 403         for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) {
 404                 ClearPageReserved(virt_to_page(addr));
 405                 init_page_count(virt_to_page(addr));
 406                 free_page(addr);
 407                 num_physpages++;
 408                 totalram_pages++;
 409         }
 410
 411         /* set up a new led state on systems shipped LED State panel */
 412         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
 413
 414         printk("%luk freed\n", (init_end - init_begin) >> 10);
 415 }
 416
 417
 418 #ifdef CONFIG_DEBUG_RODATA
 419 void mark_rodata_ro(void)
 420 {
 421         /* rodata memory was already mapped with KERNEL_RO access rights by
 422            pagetable_init() and map_pages(). No need to do additional stuff here */
 423         printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
 424                 (unsigned long)(__end_rodata - __start_rodata) >> 10);
 425 }
 426 #endif
 427
 428
 429 /*
 430  * Just an arbitrary offset to serve as a "hole" between mapping areas
 431  * (between top of physical memory and a potential pcxl dma mapping
 432  * area, and below the vmalloc mapping area).
 433  *
 434  * The current 32K value just means that there will be a 32K "hole"
 435  * between mapping areas. That means that  any out-of-bounds memory
 436  * accesses will hopefully be caught. The vmalloc() routines leaves
 437  * a hole of 4kB between each vmalloced area for the same reason.
 438  */
 439
 440  /* Leave room for gateway page expansion */
 441 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
 442 #error KERNEL_MAP_START is in gateway reserved region
 443 #endif
 444 #define MAP_START (KERNEL_MAP_START)
 445
 446 #define VM_MAP_OFFSET  (32*1024)
 447 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 448                                      & ~(VM_MAP_OFFSET-1)))
 449
 450 void *vmalloc_start __read_mostly;
 451 EXPORT_SYMBOL(vmalloc_start);
 452
 453 #ifdef CONFIG_PA11
 454 unsigned long pcxl_dma_start __read_mostly;
 455 #endif
 456
 457 void __init mem_init(void)
 458 {
 459         int codesize, reservedpages, datasize, initsize;
 460
 461         high_memory = __va((max_pfn << PAGE_SHIFT));
 462
 463 #ifndef CONFIG_DISCONTIGMEM
 464         max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
 465         totalram_pages += free_all_bootmem();
 466 #else
 467         {
 468                 int i;
 469
 470                 for (i = 0; i < npmem_ranges; i++)
 471                         totalram_pages += free_all_bootmem_node(NODE_DATA(i));
 472         }
 473 #endif
 474
 475         codesize = (unsigned long)_etext - (unsigned long)_text;
 476         datasize = (unsigned long)_edata - (unsigned long)_etext;
 477         initsize = (unsigned long)__init_end - (unsigned long)__init_begin;
 478
 479         reservedpages = 0;
 480 {
 481         unsigned long pfn;
 482 #ifdef CONFIG_DISCONTIGMEM
 483         int i;
 484
 485         for (i = 0; i < npmem_ranges; i++) {
 486                 for (pfn = node_start_pfn(i); pfn < node_end_pfn(i); pfn++) {
 487                         if (PageReserved(pfn_to_page(pfn)))
 488                                 reservedpages++;
 489                 }
 490         }
 491 #else /* !CONFIG_DISCONTIGMEM */
 492         for (pfn = 0; pfn < max_pfn; pfn++) {
 493                 /*
 494                  * Only count reserved RAM pages
 495                  */
 496                 if (PageReserved(pfn_to_page(pfn)))
 497                         reservedpages++;
 498         }
 499 #endif
 500 }
 501
 502 #ifdef CONFIG_PA11
 503         if (hppa_dma_ops == &pcxl_dma_ops) {
 504                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
 505                 vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE);
 506         } else {
 507                 pcxl_dma_start = 0;
 508                 vmalloc_start = SET_MAP_OFFSET(MAP_START);
 509         }
 510 #else
 511         vmalloc_start = SET_MAP_OFFSET(MAP_START);
 512 #endif
 513
 514         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
 515                 (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
 516                 num_physpages << (PAGE_SHIFT-10),
 517                 codesize >> 10,
 518                 reservedpages << (PAGE_SHIFT-10),
 519                 datasize >> 10,
 520                 initsize >> 10
 521         );
 522
 523 #ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
 524         printk("virtual kernel memory layout:\n"
 525                "    vmalloc : 0x%p - 0x%p   (%4ld MB)\n"
 526                "    memory  : 0x%p - 0x%p   (%4ld MB)\n"
 527                "      .init : 0x%p - 0x%p   (%4ld kB)\n"
 528                "      .data : 0x%p - 0x%p   (%4ld kB)\n"
 529                "      .text : 0x%p - 0x%p   (%4ld kB)\n",
 530
 531                (void*)VMALLOC_START, (void*)VMALLOC_END,
 532                (VMALLOC_END - VMALLOC_START) >> 20,
 533
 534                __va(0), high_memory,
 535                ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
 536
 537                __init_begin, __init_end,
 538                ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
 539
 540                _etext, _edata,
 541                ((unsigned long)_edata - (unsigned long)_etext) >> 10,
 542
 543                _text, _etext,
 544                ((unsigned long)_etext - (unsigned long)_text) >> 10);
 545 #endif
 546 }
 547
 548 unsigned long *empty_zero_page __read_mostly;
 549 EXPORT_SYMBOL(empty_zero_page);
 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 #ifndef CONFIG_DISCONTIGMEM
 559         i = max_mapnr;
 560         while (i-- > 0) {
 561                 total++;
 562                 if (PageReserved(mem_map+i))
 563                         reserved++;
 564                 else if (PageSwapCache(mem_map+i))
 565                         cached++;
 566                 else if (!page_count(&mem_map[i]))
 567                         free++;
 568                 else
 569                         shared += page_count(&mem_map[i]) - 1;
 570         }
 571 #else
 572         for (i = 0; i < npmem_ranges; i++) {
 573                 int j;
 574
 575                 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
 576                         struct page *p;
 577                         unsigned long flags;
 578
 579                         pgdat_resize_lock(NODE_DATA(i), &flags);
 580                         p = nid_page_nr(i, j) - node_start_pfn(i);
 581
 582                         total++;
 583                         if (PageReserved(p))
 584                                 reserved++;
 585                         else if (PageSwapCache(p))
 586                                 cached++;
 587                         else if (!page_count(p))
 588                                 free++;
 589                         else
 590                                 shared += page_count(p) - 1;
 591                         pgdat_resize_unlock(NODE_DATA(i), &flags);
 592                 }
 593         }
 594 #endif
 595         printk(KERN_INFO "%d pages of RAM\n", total);
 596         printk(KERN_INFO "%d reserved pages\n", reserved);
 597         printk(KERN_INFO "%d pages shared\n", shared);
 598         printk(KERN_INFO "%d pages swap cached\n", cached);
 599
 600
 601 #ifdef CONFIG_DISCONTIGMEM
 602         {
 603                 struct zonelist *zl;
 604                 int i, j;
 605
 606                 for (i = 0; i < npmem_ranges; i++) {
 607                         zl = node_zonelist(i, 0);
 608                         for (j = 0; j < MAX_NR_ZONES; j++) {
 609                                 struct zoneref *z;
 610                                 struct zone *zone;
 611
 612                                 printk("Zone list for zone %d on node %d: ", j, i);
 613                                 for_each_zone_zonelist(zone, z, zl, j)
 614                                         printk("[%d/%s] ", zone_to_nid(zone),
 615                                                                 zone->name);
 616                                 printk("\n");
 617                         }
 618                 }
 619         }
 620 #endif
 621 }
 622
 623
 624 static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot)
 625 {
 626         pgd_t *pg_dir;
 627         pmd_t *pmd;
 628         pte_t *pg_table;
 629         unsigned long end_paddr;
 630         unsigned long start_pmd;
 631         unsigned long start_pte;
 632         unsigned long tmp1;
 633         unsigned long tmp2;
 634         unsigned long address;
 635         unsigned long ro_start;
 636         unsigned long ro_end;
 637         unsigned long fv_addr;
 638         unsigned long gw_addr;
 639         extern const unsigned long fault_vector_20;
 640         extern void * const linux_gateway_page;
 641
 642         ro_start = __pa((unsigned long)_text);
 643         ro_end   = __pa((unsigned long)&data_start);
 644         fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
 645         gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
 646
 647         end_paddr = start_paddr + size;
 648
 649         pg_dir = pgd_offset_k(start_vaddr);
 650
 651 #if PTRS_PER_PMD == 1
 652         start_pmd = 0;
 653 #else
 654         start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 655 #endif
 656         start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 657
 658         address = start_paddr;
 659         while (address < end_paddr) {
 660 #if PTRS_PER_PMD == 1
 661                 pmd = (pmd_t *)__pa(pg_dir);
 662 #else
 663                 pmd = (pmd_t *)pgd_address(*pg_dir);
 664
 665                 /*
 666                  * pmd is physical at this point
 667                  */
 668
 669                 if (!pmd) {
 670                         pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER);
 671                         pmd = (pmd_t *) __pa(pmd);
 672                 }
 673
 674                 pgd_populate(NULL, pg_dir, __va(pmd));
 675 #endif
 676                 pg_dir++;
 677
 678                 /* now change pmd to kernel virtual addresses */
 679
 680                 pmd = (pmd_t *)__va(pmd) + start_pmd;
 681                 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) {
 682
 683                         /*
 684                          * pg_table is physical at this point
 685                          */
 686
 687                         pg_table = (pte_t *)pmd_address(*pmd);
 688                         if (!pg_table) {
 689                                 pg_table = (pte_t *)
 690                                         alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE);
 691                                 pg_table = (pte_t *) __pa(pg_table);
 692                         }
 693
 694                         pmd_populate_kernel(NULL, pmd, __va(pg_table));
 695
 696                         /* now change pg_table to kernel virtual addresses */
 697
 698                         pg_table = (pte_t *) __va(pg_table) + start_pte;
 699                         for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) {
 700                                 pte_t pte;
 701
 702                                 /*
 703                                  * Map the fault vector writable so we can
 704                                  * write the HPMC checksum.
 705                                  */
 706 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 707                                 if (address >= ro_start && address < ro_end
 708                                                         && address != fv_addr
 709                                                         && address != gw_addr)
 710                                     pte = __mk_pte(address, PAGE_KERNEL_RO);
 711                                 else
 712 #endif
 713                                     pte = __mk_pte(address, pgprot);
 714
 715                                 if (address >= end_paddr)
 716                                         pte_val(pte) = 0;
 717
 718                                 set_pte(pg_table, pte);
 719
 720                                 address += PAGE_SIZE;
 721                         }
 722                         start_pte = 0;
 723
 724                         if (address >= end_paddr)
 725                             break;
 726                 }
 727                 start_pmd = 0;
 728         }
 729 }
 730
 731 /*
 732  * pagetable_init() sets up the page tables
 733  *
 734  * Note that gateway_init() places the Linux gateway page at page 0.
 735  * Since gateway pages cannot be dereferenced this has the desirable
 736  * side effect of trapping those pesky NULL-reference errors in the
 737  * kernel.
 738  */
 739 static void __init pagetable_init(void)
 740 {
 741         int range;
 742
 743         /* Map each physical memory range to its kernel vaddr */
 744
 745         for (range = 0; range < npmem_ranges; range++) {
 746                 unsigned long start_paddr;
 747                 unsigned long end_paddr;
 748                 unsigned long size;
 749
 750                 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
 751                 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
 752                 size = pmem_ranges[range].pages << PAGE_SHIFT;
 753
 754                 map_pages((unsigned long)__va(start_paddr), start_paddr,
 755                         size, PAGE_KERNEL);
 756         }
 757
 758 #ifdef CONFIG_BLK_DEV_INITRD
 759         if (initrd_end && initrd_end > mem_limit) {
 760                 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
 761                 map_pages(initrd_start, __pa(initrd_start),
 762                         initrd_end - initrd_start, PAGE_KERNEL);
 763         }
 764 #endif
 765
 766         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
 767         memset(empty_zero_page, 0, PAGE_SIZE);
 768 }
 769
 770 static void __init gateway_init(void)
 771 {
 772         unsigned long linux_gateway_page_addr;
 773         /* FIXME: This is 'const' in order to trick the compiler
 774            into not treating it as DP-relative data. */
 775         extern void * const linux_gateway_page;
 776
 777         linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
 778
 779         /*
 780          * Setup Linux Gateway page.
 781          *
 782          * The Linux gateway page will reside in kernel space (on virtual
 783          * page 0), so it doesn't need to be aliased into user space.
 784          */
 785
 786         map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
 787                 PAGE_SIZE, PAGE_GATEWAY);
 788 }
 789
 790 #ifdef CONFIG_HPUX
 791 void
 792 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
 793 {
 794         pgd_t *pg_dir;
 795         pmd_t *pmd;
 796         pte_t *pg_table;
 797         unsigned long start_pmd;
 798         unsigned long start_pte;
 799         unsigned long address;
 800         unsigned long hpux_gw_page_addr;
 801         /* FIXME: This is 'const' in order to trick the compiler
 802            into not treating it as DP-relative data. */
 803         extern void * const hpux_gateway_page;
 804
 805         hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
 806
 807         /*
 808          * Setup HP-UX Gateway page.
 809          *
 810          * The HP-UX gateway page resides in the user address space,
 811          * so it needs to be aliased into each process.
 812          */
 813
 814         pg_dir = pgd_offset(mm,hpux_gw_page_addr);
 815
 816 #if PTRS_PER_PMD == 1
 817         start_pmd = 0;
 818 #else
 819         start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 820 #endif
 821         start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 822
 823         address = __pa(&hpux_gateway_page);
 824 #if PTRS_PER_PMD == 1
 825         pmd = (pmd_t *)__pa(pg_dir);
 826 #else
 827         pmd = (pmd_t *) pgd_address(*pg_dir);
 828
 829         /*
 830          * pmd is physical at this point
 831          */
 832
 833         if (!pmd) {
 834                 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
 835                 pmd = (pmd_t *) __pa(pmd);
 836         }
 837
 838         __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
 839 #endif
 840         /* now change pmd to kernel virtual addresses */
 841
 842         pmd = (pmd_t *)__va(pmd) + start_pmd;
 843
 844         /*
 845          * pg_table is physical at this point
 846          */
 847
 848         pg_table = (pte_t *) pmd_address(*pmd);
 849         if (!pg_table)
 850                 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
 851
 852         __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
 853
 854         /* now change pg_table to kernel virtual addresses */
 855
 856         pg_table = (pte_t *) __va(pg_table) + start_pte;
 857         set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
 858 }
 859 EXPORT_SYMBOL(map_hpux_gateway_page);
 860 #endif
 861
 862 void __init paging_init(void)
 863 {
 864         int i;
 865
 866         setup_bootmem();
 867         pagetable_init();
 868         gateway_init();
 869         flush_cache_all_local(); /* start with known state */
 870         flush_tlb_all_local(NULL);
 871
 872         for (i = 0; i < npmem_ranges; i++) {
 873                 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
 874
 875                 zones_size[ZONE_NORMAL] = pmem_ranges[i].pages;
 876
 877 #ifdef CONFIG_DISCONTIGMEM
 878                 /* Need to initialize the pfnnid_map before we can initialize
 879                    the zone */
 880                 {
 881                     int j;
 882                     for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
 883                          j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
 884                          j++) {
 885                         pfnnid_map[j] = i;
 886                     }
 887                 }
 888 #endif
 889
 890                 free_area_init_node(i, zones_size,
 891                                 pmem_ranges[i].start_pfn, NULL);
 892         }
 893 }
 894
 895 #ifdef CONFIG_PA20
 896
 897 /*
 898  * Currently, all PA20 chips have 18 bit protection IDs, which is the
 899  * limiting factor (space ids are 32 bits).
 900  */
 901
 902 #define NR_SPACE_IDS 262144
 903
 904 #else
 905
 906 /*
 907  * Currently we have a one-to-one relationship between space IDs and
 908  * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
 909  * support 15 bit protection IDs, so that is the limiting factor.
 910  * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
 911  * probably not worth the effort for a special case here.
 912  */
 913
 914 #define NR_SPACE_IDS 32768
 915
 916 #endif  /* !CONFIG_PA20 */
 917
 918 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
 919 #define SID_ARRAY_SIZE  (NR_SPACE_IDS / (8 * sizeof(long)))
 920
 921 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
 922 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
 923 static unsigned long space_id_index;
 924 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
 925 static unsigned long dirty_space_ids = 0;
 926
 927 static DEFINE_SPINLOCK(sid_lock);
 928
 929 unsigned long alloc_sid(void)
 930 {
 931         unsigned long index;
 932
 933         spin_lock(&sid_lock);
 934
 935         if (free_space_ids == 0) {
 936                 if (dirty_space_ids != 0) {
 937                         spin_unlock(&sid_lock);
 938                         flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
 939                         spin_lock(&sid_lock);
 940                 }
 941                 BUG_ON(free_space_ids == 0);
 942         }
 943
 944         free_space_ids--;
 945
 946         index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
 947         space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
 948         space_id_index = index;
 949
 950         spin_unlock(&sid_lock);
 951
 952         return index << SPACEID_SHIFT;
 953 }
 954
 955 void free_sid(unsigned long spaceid)
 956 {
 957         unsigned long index = spaceid >> SPACEID_SHIFT;
 958         unsigned long *dirty_space_offset;
 959
 960         dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
 961         index &= (BITS_PER_LONG - 1);
 962
 963         spin_lock(&sid_lock);
 964
 965         BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
 966
 967         *dirty_space_offset |= (1L << index);
 968         dirty_space_ids++;
 969
 970         spin_unlock(&sid_lock);
 971 }
 972
 973
 974 #ifdef CONFIG_SMP
 975 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
 976 {
 977         int i;
 978
 979         /* NOTE: sid_lock must be held upon entry */
 980
 981         *ndirtyptr = dirty_space_ids;
 982         if (dirty_space_ids != 0) {
 983             for (i = 0; i < SID_ARRAY_SIZE; i++) {
 984                 dirty_array[i] = dirty_space_id[i];
 985                 dirty_space_id[i] = 0;
 986             }
 987             dirty_space_ids = 0;
 988         }
 989
 990         return;
 991 }
 992
 993 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
 994 {
 995         int i;
 996
 997         /* NOTE: sid_lock must be held upon entry */
 998
 999         if (ndirty != 0) {
1000                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
1001                         space_id[i] ^= dirty_array[i];
1002                 }
1003
1004                 free_space_ids += ndirty;
1005                 space_id_index = 0;
1006         }
1007 }
1008
1009 #else /* CONFIG_SMP */
1010
1011 static void recycle_sids(void)
1012 {
1013         int i;
1014
1015         /* NOTE: sid_lock must be held upon entry */
1016
1017         if (dirty_space_ids != 0) {
1018                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
1019                         space_id[i] ^= dirty_space_id[i];
1020                         dirty_space_id[i] = 0;
1021                 }
1022
1023                 free_space_ids += dirty_space_ids;
1024                 dirty_space_ids = 0;
1025                 space_id_index = 0;
1026         }
1027 }
1028 #endif
1029
1030 /*
1031  * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
1032  * purged, we can safely reuse the space ids that were released but
1033  * not flushed from the tlb.
1034  */
1035
1036 #ifdef CONFIG_SMP
1037
1038 static unsigned long recycle_ndirty;
1039 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
1040 static unsigned int recycle_inuse;
1041
1042 void flush_tlb_all(void)
1043 {
1044         int do_recycle;
1045
1046         do_recycle = 0;
1047         spin_lock(&sid_lock);
1048         if (dirty_space_ids > RECYCLE_THRESHOLD) {
1049             BUG_ON(recycle_inuse);  /* FIXME: Use a semaphore/wait queue here */
1050             get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
1051             recycle_inuse++;
1052             do_recycle++;
1053         }
1054         spin_unlock(&sid_lock);
1055         on_each_cpu(flush_tlb_all_local, NULL, 1);
1056         if (do_recycle) {
1057             spin_lock(&sid_lock);
1058             recycle_sids(recycle_ndirty,recycle_dirty_array);
1059             recycle_inuse = 0;
1060             spin_unlock(&sid_lock);
1061         }
1062 }
1063 #else
1064 void flush_tlb_all(void)
1065 {
1066         spin_lock(&sid_lock);
1067         flush_tlb_all_local(NULL);
1068         recycle_sids();
1069         spin_unlock(&sid_lock);
1070 }
1071 #endif
1072
1073 #ifdef CONFIG_BLK_DEV_INITRD
1074 void free_initrd_mem(unsigned long start, unsigned long end)
1075 {
1076         if (start >= end)
1077                 return;
1078         printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1079         for (; start < end; start += PAGE_SIZE) {
1080                 ClearPageReserved(virt_to_page(start));
1081                 init_page_count(virt_to_page(start));
1082                 free_page(start);
1083                 num_physpages++;
1084                 totalram_pages++;
1085         }
1086 }
1087 #endif