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 Helge Deller (deller@gmx.de)
  10  *
  11  */
  12
  13 #include <linux/config.h>
  14
  15 #include <linux/module.h>
  16 #include <linux/mm.h>
  17 #include <linux/bootmem.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/tlb.h>
  29 #include <asm/pdc_chassis.h>
  30 #include <asm/mmzone.h>
  31
  32 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  33
  34 extern char _text;      /* start of kernel code, defined by linker */
  35 extern int  data_start;
  36 extern char _end;       /* end of BSS, defined by linker */
  37 extern char __init_begin, __init_end;
  38
  39 #ifdef CONFIG_DISCONTIGMEM
  40 struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
  41 bootmem_data_t bmem_data[MAX_NUMNODES] __read_mostly;
  42 unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
  43 #endif
  44
  45 static struct resource data_resource = {
  46         .name   = "Kernel data",
  47         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  48 };
  49
  50 static struct resource code_resource = {
  51         .name   = "Kernel code",
  52         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  53 };
  54
  55 static struct resource pdcdata_resource = {
  56         .name   = "PDC data (Page Zero)",
  57         .start  = 0,
  58         .end    = 0x9ff,
  59         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  60 };
  61
  62 static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
  63
  64 /* The following array is initialized from the firmware specific
  65  * information retrieved in kernel/inventory.c.
  66  */
  67
  68 physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
  69 int npmem_ranges __read_mostly;
  70
  71 #ifdef __LP64__
  72 #define MAX_MEM         (~0UL)
  73 #else /* !__LP64__ */
  74 #define MAX_MEM         (3584U*1024U*1024U)
  75 #endif /* !__LP64__ */
  76
  77 static unsigned long mem_limit __read_mostly = MAX_MEM;
  78
  79 static void __init mem_limit_func(void)
  80 {
  81         char *cp, *end;
  82         unsigned long limit;
  83         extern char saved_command_line[];
  84
  85         /* We need this before __setup() functions are called */
  86
  87         limit = MAX_MEM;
  88         for (cp = saved_command_line; *cp; ) {
  89                 if (memcmp(cp, "mem=", 4) == 0) {
  90                         cp += 4;
  91                         limit = memparse(cp, &end);
  92                         if (end != cp)
  93                                 break;
  94                         cp = end;
  95                 } else {
  96                         while (*cp != ' ' && *cp)
  97                                 ++cp;
  98                         while (*cp == ' ')
  99                                 ++cp;
 100                 }
 101         }
 102
 103         if (limit < mem_limit)
 104                 mem_limit = limit;
 105 }
 106
 107 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
 108
 109 static void __init setup_bootmem(void)
 110 {
 111         unsigned long bootmap_size;
 112         unsigned long mem_max;
 113         unsigned long bootmap_pages;
 114         unsigned long bootmap_start_pfn;
 115         unsigned long bootmap_pfn;
 116 #ifndef CONFIG_DISCONTIGMEM
 117         physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
 118         int npmem_holes;
 119 #endif
 120         int i, sysram_resource_count;
 121
 122         disable_sr_hashing(); /* Turn off space register hashing */
 123
 124         /*
 125          * Sort the ranges. Since the number of ranges is typically
 126          * small, and performance is not an issue here, just do
 127          * a simple insertion sort.
 128          */
 129
 130         for (i = 1; i < npmem_ranges; i++) {
 131                 int j;
 132
 133                 for (j = i; j > 0; j--) {
 134                         unsigned long tmp;
 135
 136                         if (pmem_ranges[j-1].start_pfn <
 137                             pmem_ranges[j].start_pfn) {
 138
 139                                 break;
 140                         }
 141                         tmp = pmem_ranges[j-1].start_pfn;
 142                         pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
 143                         pmem_ranges[j].start_pfn = tmp;
 144                         tmp = pmem_ranges[j-1].pages;
 145                         pmem_ranges[j-1].pages = pmem_ranges[j].pages;
 146                         pmem_ranges[j].pages = tmp;
 147                 }
 148         }
 149
 150 #ifndef CONFIG_DISCONTIGMEM
 151         /*
 152          * Throw out ranges that are too far apart (controlled by
 153          * MAX_GAP).
 154          */
 155
 156         for (i = 1; i < npmem_ranges; i++) {
 157                 if (pmem_ranges[i].start_pfn -
 158                         (pmem_ranges[i-1].start_pfn +
 159                          pmem_ranges[i-1].pages) > MAX_GAP) {
 160                         npmem_ranges = i;
 161                         printk("Large gap in memory detected (%ld pages). "
 162                                "Consider turning on CONFIG_DISCONTIGMEM\n",
 163                                pmem_ranges[i].start_pfn -
 164                                (pmem_ranges[i-1].start_pfn +
 165                                 pmem_ranges[i-1].pages));
 166                         break;
 167                 }
 168         }
 169 #endif
 170
 171         if (npmem_ranges > 1) {
 172
 173                 /* Print the memory ranges */
 174
 175                 printk(KERN_INFO "Memory Ranges:\n");
 176
 177                 for (i = 0; i < npmem_ranges; i++) {
 178                         unsigned long start;
 179                         unsigned long size;
 180
 181                         size = (pmem_ranges[i].pages << PAGE_SHIFT);
 182                         start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
 183                         printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
 184                                 i,start, start + (size - 1), size >> 20);
 185                 }
 186         }
 187
 188         sysram_resource_count = npmem_ranges;
 189         for (i = 0; i < sysram_resource_count; i++) {
 190                 struct resource *res = &sysram_resources[i];
 191                 res->name = "System RAM";
 192                 res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT;
 193                 res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1;
 194                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 195                 request_resource(&iomem_resource, res);
 196         }
 197
 198         /*
 199          * For 32 bit kernels we limit the amount of memory we can
 200          * support, in order to preserve enough kernel address space
 201          * for other purposes. For 64 bit kernels we don't normally
 202          * limit the memory, but this mechanism can be used to
 203          * artificially limit the amount of memory (and it is written
 204          * to work with multiple memory ranges).
 205          */
 206
 207         mem_limit_func();       /* check for "mem=" argument */
 208
 209         mem_max = 0;
 210         num_physpages = 0;
 211         for (i = 0; i < npmem_ranges; i++) {
 212                 unsigned long rsize;
 213
 214                 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
 215                 if ((mem_max + rsize) > mem_limit) {
 216                         printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
 217                         if (mem_max == mem_limit)
 218                                 npmem_ranges = i;
 219                         else {
 220                                 pmem_ranges[i].pages =   (mem_limit >> PAGE_SHIFT)
 221                                                        - (mem_max >> PAGE_SHIFT);
 222                                 npmem_ranges = i + 1;
 223                                 mem_max = mem_limit;
 224                         }
 225                 num_physpages += pmem_ranges[i].pages;
 226                         break;
 227                 }
 228             num_physpages += pmem_ranges[i].pages;
 229                 mem_max += rsize;
 230         }
 231
 232         printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
 233
 234 #ifndef CONFIG_DISCONTIGMEM
 235         /* Merge the ranges, keeping track of the holes */
 236
 237         {
 238                 unsigned long end_pfn;
 239                 unsigned long hole_pages;
 240
 241                 npmem_holes = 0;
 242                 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
 243                 for (i = 1; i < npmem_ranges; i++) {
 244
 245                         hole_pages = pmem_ranges[i].start_pfn - end_pfn;
 246                         if (hole_pages) {
 247                                 pmem_holes[npmem_holes].start_pfn = end_pfn;
 248                                 pmem_holes[npmem_holes++].pages = hole_pages;
 249                                 end_pfn += hole_pages;
 250                         }
 251                         end_pfn += pmem_ranges[i].pages;
 252                 }
 253
 254                 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
 255                 npmem_ranges = 1;
 256         }
 257 #endif
 258
 259         bootmap_pages = 0;
 260         for (i = 0; i < npmem_ranges; i++)
 261                 bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages);
 262
 263         bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT;
 264
 265 #ifdef CONFIG_DISCONTIGMEM
 266         for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
 267                 memset(NODE_DATA(i), 0, sizeof(pg_data_t));
 268                 NODE_DATA(i)->bdata = &bmem_data[i];
 269         }
 270         memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
 271
 272         for (i = 0; i < npmem_ranges; i++)
 273                 node_set_online(i);
 274 #endif
 275
 276         /*
 277          * Initialize and free the full range of memory in each range.
 278          * Note that the only writing these routines do are to the bootmap,
 279          * and we've made sure to locate the bootmap properly so that they
 280          * won't be writing over anything important.
 281          */
 282
 283         bootmap_pfn = bootmap_start_pfn;
 284         max_pfn = 0;
 285         for (i = 0; i < npmem_ranges; i++) {
 286                 unsigned long start_pfn;
 287                 unsigned long npages;
 288
 289                 start_pfn = pmem_ranges[i].start_pfn;
 290                 npages = pmem_ranges[i].pages;
 291
 292                 bootmap_size = init_bootmem_node(NODE_DATA(i),
 293                                                 bootmap_pfn,
 294                                                 start_pfn,
 295                                                 (start_pfn + npages) );
 296                 free_bootmem_node(NODE_DATA(i),
 297                                   (start_pfn << PAGE_SHIFT),
 298                                   (npages << PAGE_SHIFT) );
 299                 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 300                 if ((start_pfn + npages) > max_pfn)
 301                         max_pfn = start_pfn + npages;
 302         }
 303
 304         /* IOMMU is always used to access "high mem" on those boxes
 305          * that can support enough mem that a PCI device couldn't
 306          * directly DMA to any physical addresses.
 307          * ISA DMA support will need to revisit this.
 308          */
 309         max_low_pfn = max_pfn;
 310
 311         if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) {
 312                 printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n");
 313                 BUG();
 314         }
 315
 316         /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
 317
 318 #define PDC_CONSOLE_IO_IODC_SIZE 32768
 319
 320         reserve_bootmem_node(NODE_DATA(0), 0UL,
 321                         (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE));
 322         reserve_bootmem_node(NODE_DATA(0),__pa((unsigned long)&_text),
 323                         (unsigned long)(&_end - &_text));
 324         reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
 325                         ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT));
 326
 327 #ifndef CONFIG_DISCONTIGMEM
 328
 329         /* reserve the holes */
 330
 331         for (i = 0; i < npmem_holes; i++) {
 332                 reserve_bootmem_node(NODE_DATA(0),
 333                                 (pmem_holes[i].start_pfn << PAGE_SHIFT),
 334                                 (pmem_holes[i].pages << PAGE_SHIFT));
 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), initrd_reserve);
 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         extern char __start_rodata, __end_rodata;
 422         /* rodata memory was already mapped with KERNEL_RO access rights by
 423            pagetable_init() and map_pages(). No need to do additional stuff here */
 424         printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
 425                 (unsigned long)(&__end_rodata - &__start_rodata) >> 10);
 426 }
 427 #endif
 428
 429
 430 /*
 431  * Just an arbitrary offset to serve as a "hole" between mapping areas
 432  * (between top of physical memory and a potential pcxl dma mapping
 433  * area, and below the vmalloc mapping area).
 434  *
 435  * The current 32K value just means that there will be a 32K "hole"
 436  * between mapping areas. That means that  any out-of-bounds memory
 437  * accesses will hopefully be caught. The vmalloc() routines leaves
 438  * a hole of 4kB between each vmalloced area for the same reason.
 439  */
 440
 441  /* Leave room for gateway page expansion */
 442 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
 443 #error KERNEL_MAP_START is in gateway reserved region
 444 #endif
 445 #define MAP_START (KERNEL_MAP_START)
 446
 447 #define VM_MAP_OFFSET  (32*1024)
 448 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 449                                      & ~(VM_MAP_OFFSET-1)))
 450
 451 void *vmalloc_start __read_mostly;
 452 EXPORT_SYMBOL(vmalloc_start);
 453
 454 #ifdef CONFIG_PA11
 455 unsigned long pcxl_dma_start __read_mostly;
 456 #endif
 457
 458 void __init mem_init(void)
 459 {
 460         high_memory = __va((max_pfn << PAGE_SHIFT));
 461
 462 #ifndef CONFIG_DISCONTIGMEM
 463         max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
 464         totalram_pages += free_all_bootmem();
 465 #else
 466         {
 467                 int i;
 468
 469                 for (i = 0; i < npmem_ranges; i++)
 470                         totalram_pages += free_all_bootmem_node(NODE_DATA(i));
 471         }
 472 #endif
 473
 474         printk(KERN_INFO "Memory: %luk available\n", num_physpages << (PAGE_SHIFT-10));
 475
 476 #ifdef CONFIG_PA11
 477         if (hppa_dma_ops == &pcxl_dma_ops) {
 478                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
 479                 vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE);
 480         } else {
 481                 pcxl_dma_start = 0;
 482                 vmalloc_start = SET_MAP_OFFSET(MAP_START);
 483         }
 484 #else
 485         vmalloc_start = SET_MAP_OFFSET(MAP_START);
 486 #endif
 487
 488 }
 489
 490 unsigned long *empty_zero_page __read_mostly;
 491
 492 void show_mem(void)
 493 {
 494         int i,free = 0,total = 0,reserved = 0;
 495         int shared = 0, cached = 0;
 496
 497         printk(KERN_INFO "Mem-info:\n");
 498         show_free_areas();
 499         printk(KERN_INFO "Free swap:     %6ldkB\n",
 500                                 nr_swap_pages<<(PAGE_SHIFT-10));
 501 #ifndef CONFIG_DISCONTIGMEM
 502         i = max_mapnr;
 503         while (i-- > 0) {
 504                 total++;
 505                 if (PageReserved(mem_map+i))
 506                         reserved++;
 507                 else if (PageSwapCache(mem_map+i))
 508                         cached++;
 509                 else if (!page_count(&mem_map[i]))
 510                         free++;
 511                 else
 512                         shared += page_count(&mem_map[i]) - 1;
 513         }
 514 #else
 515         for (i = 0; i < npmem_ranges; i++) {
 516                 int j;
 517
 518                 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
 519                         struct page *p;
 520                         unsigned long flags;
 521
 522                         pgdat_resize_lock(NODE_DATA(i), &flags);
 523                         p = nid_page_nr(i, j) - node_start_pfn(i);
 524
 525                         total++;
 526                         if (PageReserved(p))
 527                                 reserved++;
 528                         else if (PageSwapCache(p))
 529                                 cached++;
 530                         else if (!page_count(p))
 531                                 free++;
 532                         else
 533                                 shared += page_count(p) - 1;
 534                         pgdat_resize_unlock(NODE_DATA(i), &flags);
 535                 }
 536         }
 537 #endif
 538         printk(KERN_INFO "%d pages of RAM\n", total);
 539         printk(KERN_INFO "%d reserved pages\n", reserved);
 540         printk(KERN_INFO "%d pages shared\n", shared);
 541         printk(KERN_INFO "%d pages swap cached\n", cached);
 542
 543
 544 #ifdef CONFIG_DISCONTIGMEM
 545         {
 546                 struct zonelist *zl;
 547                 int i, j, k;
 548
 549                 for (i = 0; i < npmem_ranges; i++) {
 550                         for (j = 0; j < MAX_NR_ZONES; j++) {
 551                                 zl = NODE_DATA(i)->node_zonelists + j;
 552
 553                                 printk("Zone list for zone %d on node %d: ", j, i);
 554                                 for (k = 0; zl->zones[k] != NULL; k++)
 555                                         printk("[%d/%s] ", zl->zones[k]->zone_pgdat->node_id, zl->zones[k]->name);
 556                                 printk("\n");
 557                         }
 558                 }
 559         }
 560 #endif
 561 }
 562
 563
 564 static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot)
 565 {
 566         pgd_t *pg_dir;
 567         pmd_t *pmd;
 568         pte_t *pg_table;
 569         unsigned long end_paddr;
 570         unsigned long start_pmd;
 571         unsigned long start_pte;
 572         unsigned long tmp1;
 573         unsigned long tmp2;
 574         unsigned long address;
 575         unsigned long ro_start;
 576         unsigned long ro_end;
 577         unsigned long fv_addr;
 578         unsigned long gw_addr;
 579         extern const unsigned long fault_vector_20;
 580         extern void * const linux_gateway_page;
 581
 582         ro_start = __pa((unsigned long)&_text);
 583         ro_end   = __pa((unsigned long)&data_start);
 584         fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
 585         gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
 586
 587         end_paddr = start_paddr + size;
 588
 589         pg_dir = pgd_offset_k(start_vaddr);
 590
 591 #if PTRS_PER_PMD == 1
 592         start_pmd = 0;
 593 #else
 594         start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 595 #endif
 596         start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 597
 598         address = start_paddr;
 599         while (address < end_paddr) {
 600 #if PTRS_PER_PMD == 1
 601                 pmd = (pmd_t *)__pa(pg_dir);
 602 #else
 603                 pmd = (pmd_t *)pgd_address(*pg_dir);
 604
 605                 /*
 606                  * pmd is physical at this point
 607                  */
 608
 609                 if (!pmd) {
 610                         pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER);
 611                         pmd = (pmd_t *) __pa(pmd);
 612                 }
 613
 614                 pgd_populate(NULL, pg_dir, __va(pmd));
 615 #endif
 616                 pg_dir++;
 617
 618                 /* now change pmd to kernel virtual addresses */
 619
 620                 pmd = (pmd_t *)__va(pmd) + start_pmd;
 621                 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) {
 622
 623                         /*
 624                          * pg_table is physical at this point
 625                          */
 626
 627                         pg_table = (pte_t *)pmd_address(*pmd);
 628                         if (!pg_table) {
 629                                 pg_table = (pte_t *)
 630                                         alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE);
 631                                 pg_table = (pte_t *) __pa(pg_table);
 632                         }
 633
 634                         pmd_populate_kernel(NULL, pmd, __va(pg_table));
 635
 636                         /* now change pg_table to kernel virtual addresses */
 637
 638                         pg_table = (pte_t *) __va(pg_table) + start_pte;
 639                         for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) {
 640                                 pte_t pte;
 641
 642                                 /*
 643                                  * Map the fault vector writable so we can
 644                                  * write the HPMC checksum.
 645                                  */
 646 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 647                                 if (address >= ro_start && address < ro_end
 648                                                         && address != fv_addr
 649                                                         && address != gw_addr)
 650                                     pte = __mk_pte(address, PAGE_KERNEL_RO);
 651                                 else
 652 #endif
 653                                     pte = __mk_pte(address, pgprot);
 654
 655                                 if (address >= end_paddr)
 656                                         pte_val(pte) = 0;
 657
 658                                 set_pte(pg_table, pte);
 659
 660                                 address += PAGE_SIZE;
 661                         }
 662                         start_pte = 0;
 663
 664                         if (address >= end_paddr)
 665                             break;
 666                 }
 667                 start_pmd = 0;
 668         }
 669 }
 670
 671 /*
 672  * pagetable_init() sets up the page tables
 673  *
 674  * Note that gateway_init() places the Linux gateway page at page 0.
 675  * Since gateway pages cannot be dereferenced this has the desirable
 676  * side effect of trapping those pesky NULL-reference errors in the
 677  * kernel.
 678  */
 679 static void __init pagetable_init(void)
 680 {
 681         int range;
 682
 683         /* Map each physical memory range to its kernel vaddr */
 684
 685         for (range = 0; range < npmem_ranges; range++) {
 686                 unsigned long start_paddr;
 687                 unsigned long end_paddr;
 688                 unsigned long size;
 689
 690                 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
 691                 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
 692                 size = pmem_ranges[range].pages << PAGE_SHIFT;
 693
 694                 map_pages((unsigned long)__va(start_paddr), start_paddr,
 695                         size, PAGE_KERNEL);
 696         }
 697
 698 #ifdef CONFIG_BLK_DEV_INITRD
 699         if (initrd_end && initrd_end > mem_limit) {
 700                 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
 701                 map_pages(initrd_start, __pa(initrd_start),
 702                         initrd_end - initrd_start, PAGE_KERNEL);
 703         }
 704 #endif
 705
 706         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
 707         memset(empty_zero_page, 0, PAGE_SIZE);
 708 }
 709
 710 static void __init gateway_init(void)
 711 {
 712         unsigned long linux_gateway_page_addr;
 713         /* FIXME: This is 'const' in order to trick the compiler
 714            into not treating it as DP-relative data. */
 715         extern void * const linux_gateway_page;
 716
 717         linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
 718
 719         /*
 720          * Setup Linux Gateway page.
 721          *
 722          * The Linux gateway page will reside in kernel space (on virtual
 723          * page 0), so it doesn't need to be aliased into user space.
 724          */
 725
 726         map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
 727                 PAGE_SIZE, PAGE_GATEWAY);
 728 }
 729
 730 #ifdef CONFIG_HPUX
 731 void
 732 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
 733 {
 734         pgd_t *pg_dir;
 735         pmd_t *pmd;
 736         pte_t *pg_table;
 737         unsigned long start_pmd;
 738         unsigned long start_pte;
 739         unsigned long address;
 740         unsigned long hpux_gw_page_addr;
 741         /* FIXME: This is 'const' in order to trick the compiler
 742            into not treating it as DP-relative data. */
 743         extern void * const hpux_gateway_page;
 744
 745         hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
 746
 747         /*
 748          * Setup HP-UX Gateway page.
 749          *
 750          * The HP-UX gateway page resides in the user address space,
 751          * so it needs to be aliased into each process.
 752          */
 753
 754         pg_dir = pgd_offset(mm,hpux_gw_page_addr);
 755
 756 #if PTRS_PER_PMD == 1
 757         start_pmd = 0;
 758 #else
 759         start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 760 #endif
 761         start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 762
 763         address = __pa(&hpux_gateway_page);
 764 #if PTRS_PER_PMD == 1
 765         pmd = (pmd_t *)__pa(pg_dir);
 766 #else
 767         pmd = (pmd_t *) pgd_address(*pg_dir);
 768
 769         /*
 770          * pmd is physical at this point
 771          */
 772
 773         if (!pmd) {
 774                 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
 775                 pmd = (pmd_t *) __pa(pmd);
 776         }
 777
 778         __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
 779 #endif
 780         /* now change pmd to kernel virtual addresses */
 781
 782         pmd = (pmd_t *)__va(pmd) + start_pmd;
 783
 784         /*
 785          * pg_table is physical at this point
 786          */
 787
 788         pg_table = (pte_t *) pmd_address(*pmd);
 789         if (!pg_table)
 790                 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
 791
 792         __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
 793
 794         /* now change pg_table to kernel virtual addresses */
 795
 796         pg_table = (pte_t *) __va(pg_table) + start_pte;
 797         set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
 798 }
 799 EXPORT_SYMBOL(map_hpux_gateway_page);
 800 #endif
 801
 802 void __init paging_init(void)
 803 {
 804         int i;
 805
 806         setup_bootmem();
 807         pagetable_init();
 808         gateway_init();
 809         flush_cache_all_local(); /* start with known state */
 810         flush_tlb_all_local(NULL);
 811
 812         for (i = 0; i < npmem_ranges; i++) {
 813                 unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0 };
 814
 815                 /* We have an IOMMU, so all memory can go into a single
 816                    ZONE_DMA zone. */
 817                 zones_size[ZONE_DMA] = pmem_ranges[i].pages;
 818
 819 #ifdef CONFIG_DISCONTIGMEM
 820                 /* Need to initialize the pfnnid_map before we can initialize
 821                    the zone */
 822                 {
 823                     int j;
 824                     for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
 825                          j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
 826                          j++) {
 827                         pfnnid_map[j] = i;
 828                     }
 829                 }
 830 #endif
 831
 832                 free_area_init_node(i, NODE_DATA(i), zones_size,
 833                                 pmem_ranges[i].start_pfn, NULL);
 834         }
 835 }
 836
 837 #ifdef CONFIG_PA20
 838
 839 /*
 840  * Currently, all PA20 chips have 18 bit protection id's, which is the
 841  * limiting factor (space ids are 32 bits).
 842  */
 843
 844 #define NR_SPACE_IDS 262144
 845
 846 #else
 847
 848 /*
 849  * Currently we have a one-to-one relationship between space id's and
 850  * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
 851  * support 15 bit protection id's, so that is the limiting factor.
 852  * PCXT' has 18 bit protection id's, but only 16 bit spaceids, so it's
 853  * probably not worth the effort for a special case here.
 854  */
 855
 856 #define NR_SPACE_IDS 32768
 857
 858 #endif  /* !CONFIG_PA20 */
 859
 860 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
 861 #define SID_ARRAY_SIZE  (NR_SPACE_IDS / (8 * sizeof(long)))
 862
 863 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
 864 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
 865 static unsigned long space_id_index;
 866 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
 867 static unsigned long dirty_space_ids = 0;
 868
 869 static DEFINE_SPINLOCK(sid_lock);
 870
 871 unsigned long alloc_sid(void)
 872 {
 873         unsigned long index;
 874
 875         spin_lock(&sid_lock);
 876
 877         if (free_space_ids == 0) {
 878                 if (dirty_space_ids != 0) {
 879                         spin_unlock(&sid_lock);
 880                         flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
 881                         spin_lock(&sid_lock);
 882                 }
 883                 BUG_ON(free_space_ids == 0);
 884         }
 885
 886         free_space_ids--;
 887
 888         index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
 889         space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
 890         space_id_index = index;
 891
 892         spin_unlock(&sid_lock);
 893
 894         return index << SPACEID_SHIFT;
 895 }
 896
 897 void free_sid(unsigned long spaceid)
 898 {
 899         unsigned long index = spaceid >> SPACEID_SHIFT;
 900         unsigned long *dirty_space_offset;
 901
 902         dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
 903         index &= (BITS_PER_LONG - 1);
 904
 905         spin_lock(&sid_lock);
 906
 907         BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
 908
 909         *dirty_space_offset |= (1L << index);
 910         dirty_space_ids++;
 911
 912         spin_unlock(&sid_lock);
 913 }
 914
 915
 916 #ifdef CONFIG_SMP
 917 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
 918 {
 919         int i;
 920
 921         /* NOTE: sid_lock must be held upon entry */
 922
 923         *ndirtyptr = dirty_space_ids;
 924         if (dirty_space_ids != 0) {
 925             for (i = 0; i < SID_ARRAY_SIZE; i++) {
 926                 dirty_array[i] = dirty_space_id[i];
 927                 dirty_space_id[i] = 0;
 928             }
 929             dirty_space_ids = 0;
 930         }
 931
 932         return;
 933 }
 934
 935 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
 936 {
 937         int i;
 938
 939         /* NOTE: sid_lock must be held upon entry */
 940
 941         if (ndirty != 0) {
 942                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 943                         space_id[i] ^= dirty_array[i];
 944                 }
 945
 946                 free_space_ids += ndirty;
 947                 space_id_index = 0;
 948         }
 949 }
 950
 951 #else /* CONFIG_SMP */
 952
 953 static void recycle_sids(void)
 954 {
 955         int i;
 956
 957         /* NOTE: sid_lock must be held upon entry */
 958
 959         if (dirty_space_ids != 0) {
 960                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 961                         space_id[i] ^= dirty_space_id[i];
 962                         dirty_space_id[i] = 0;
 963                 }
 964
 965                 free_space_ids += dirty_space_ids;
 966                 dirty_space_ids = 0;
 967                 space_id_index = 0;
 968         }
 969 }
 970 #endif
 971
 972 /*
 973  * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
 974  * purged, we can safely reuse the space ids that were released but
 975  * not flushed from the tlb.
 976  */
 977
 978 #ifdef CONFIG_SMP
 979
 980 static unsigned long recycle_ndirty;
 981 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
 982 static unsigned int recycle_inuse;
 983
 984 void flush_tlb_all(void)
 985 {
 986         int do_recycle;
 987
 988         do_recycle = 0;
 989         spin_lock(&sid_lock);
 990         if (dirty_space_ids > RECYCLE_THRESHOLD) {
 991             BUG_ON(recycle_inuse);  /* FIXME: Use a semaphore/wait queue here */
 992             get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
 993             recycle_inuse++;
 994             do_recycle++;
 995         }
 996         spin_unlock(&sid_lock);
 997         on_each_cpu(flush_tlb_all_local, NULL, 1, 1);
 998         if (do_recycle) {
 999             spin_lock(&sid_lock);
1000             recycle_sids(recycle_ndirty,recycle_dirty_array);
1001             recycle_inuse = 0;
1002             spin_unlock(&sid_lock);
1003         }
1004 }
1005 #else
1006 void flush_tlb_all(void)
1007 {
1008         spin_lock(&sid_lock);
1009         flush_tlb_all_local(NULL);
1010         recycle_sids();
1011         spin_unlock(&sid_lock);
1012 }
1013 #endif
1014
1015 #ifdef CONFIG_BLK_DEV_INITRD
1016 void free_initrd_mem(unsigned long start, unsigned long end)
1017 {
1018         if (start >= end)
1019                 return;
1020         printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1021         for (; start < end; start += PAGE_SIZE) {
1022                 ClearPageReserved(virt_to_page(start));
1023                 init_page_count(virt_to_page(start));
1024                 free_page(start);
1025                 num_physpages++;
1026                 totalram_pages++;
1027         }
1028 }
1029 #endif