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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 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/tlb.h>
  28 #include <asm/pdc_chassis.h>
  29 #include <asm/mmzone.h>
  30 #include <asm/sections.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         /* 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         high_memory = __va((max_pfn << PAGE_SHIFT));
 460
 461 #ifndef CONFIG_DISCONTIGMEM
 462         max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
 463         totalram_pages += free_all_bootmem();
 464 #else
 465         {
 466                 int i;
 467
 468                 for (i = 0; i < npmem_ranges; i++)
 469                         totalram_pages += free_all_bootmem_node(NODE_DATA(i));
 470         }
 471 #endif
 472
 473         printk(KERN_INFO "Memory: %luk available\n", num_physpages << (PAGE_SHIFT-10));
 474
 475 #ifdef CONFIG_PA11
 476         if (hppa_dma_ops == &pcxl_dma_ops) {
 477                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
 478                 vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE);
 479         } else {
 480                 pcxl_dma_start = 0;
 481                 vmalloc_start = SET_MAP_OFFSET(MAP_START);
 482         }
 483 #else
 484         vmalloc_start = SET_MAP_OFFSET(MAP_START);
 485 #endif
 486
 487 }
 488
 489 unsigned long *empty_zero_page __read_mostly;
 490
 491 void show_mem(void)
 492 {
 493         int i,free = 0,total = 0,reserved = 0;
 494         int shared = 0, cached = 0;
 495
 496         printk(KERN_INFO "Mem-info:\n");
 497         show_free_areas();
 498         printk(KERN_INFO "Free swap:     %6ldkB\n",
 499                                 nr_swap_pages<<(PAGE_SHIFT-10));
 500 #ifndef CONFIG_DISCONTIGMEM
 501         i = max_mapnr;
 502         while (i-- > 0) {
 503                 total++;
 504                 if (PageReserved(mem_map+i))
 505                         reserved++;
 506                 else if (PageSwapCache(mem_map+i))
 507                         cached++;
 508                 else if (!page_count(&mem_map[i]))
 509                         free++;
 510                 else
 511                         shared += page_count(&mem_map[i]) - 1;
 512         }
 513 #else
 514         for (i = 0; i < npmem_ranges; i++) {
 515                 int j;
 516
 517                 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
 518                         struct page *p;
 519                         unsigned long flags;
 520
 521                         pgdat_resize_lock(NODE_DATA(i), &flags);
 522                         p = nid_page_nr(i, j) - node_start_pfn(i);
 523
 524                         total++;
 525                         if (PageReserved(p))
 526                                 reserved++;
 527                         else if (PageSwapCache(p))
 528                                 cached++;
 529                         else if (!page_count(p))
 530                                 free++;
 531                         else
 532                                 shared += page_count(p) - 1;
 533                         pgdat_resize_unlock(NODE_DATA(i), &flags);
 534                 }
 535         }
 536 #endif
 537         printk(KERN_INFO "%d pages of RAM\n", total);
 538         printk(KERN_INFO "%d reserved pages\n", reserved);
 539         printk(KERN_INFO "%d pages shared\n", shared);
 540         printk(KERN_INFO "%d pages swap cached\n", cached);
 541
 542
 543 #ifdef CONFIG_DISCONTIGMEM
 544         {
 545                 struct zonelist *zl;
 546                 int i, j, k;
 547
 548                 for (i = 0; i < npmem_ranges; i++) {
 549                         for (j = 0; j < MAX_NR_ZONES; j++) {
 550                                 zl = NODE_DATA(i)->node_zonelists + j;
 551
 552                                 printk("Zone list for zone %d on node %d: ", j, i);
 553                                 for (k = 0; zl->zones[k] != NULL; k++)
 554                                         printk("[%d/%s] ", zone_to_nid(zl->zones[k]), zl->zones[k]->name);
 555                                 printk("\n");
 556                         }
 557                 }
 558         }
 559 #endif
 560 }
 561
 562
 563 static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot)
 564 {
 565         pgd_t *pg_dir;
 566         pmd_t *pmd;
 567         pte_t *pg_table;
 568         unsigned long end_paddr;
 569         unsigned long start_pmd;
 570         unsigned long start_pte;
 571         unsigned long tmp1;
 572         unsigned long tmp2;
 573         unsigned long address;
 574         unsigned long ro_start;
 575         unsigned long ro_end;
 576         unsigned long fv_addr;
 577         unsigned long gw_addr;
 578         extern const unsigned long fault_vector_20;
 579         extern void * const linux_gateway_page;
 580
 581         ro_start = __pa((unsigned long)&_text);
 582         ro_end   = __pa((unsigned long)&data_start);
 583         fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
 584         gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
 585
 586         end_paddr = start_paddr + size;
 587
 588         pg_dir = pgd_offset_k(start_vaddr);
 589
 590 #if PTRS_PER_PMD == 1
 591         start_pmd = 0;
 592 #else
 593         start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 594 #endif
 595         start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 596
 597         address = start_paddr;
 598         while (address < end_paddr) {
 599 #if PTRS_PER_PMD == 1
 600                 pmd = (pmd_t *)__pa(pg_dir);
 601 #else
 602                 pmd = (pmd_t *)pgd_address(*pg_dir);
 603
 604                 /*
 605                  * pmd is physical at this point
 606                  */
 607
 608                 if (!pmd) {
 609                         pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER);
 610                         pmd = (pmd_t *) __pa(pmd);
 611                 }
 612
 613                 pgd_populate(NULL, pg_dir, __va(pmd));
 614 #endif
 615                 pg_dir++;
 616
 617                 /* now change pmd to kernel virtual addresses */
 618
 619                 pmd = (pmd_t *)__va(pmd) + start_pmd;
 620                 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) {
 621
 622                         /*
 623                          * pg_table is physical at this point
 624                          */
 625
 626                         pg_table = (pte_t *)pmd_address(*pmd);
 627                         if (!pg_table) {
 628                                 pg_table = (pte_t *)
 629                                         alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE);
 630                                 pg_table = (pte_t *) __pa(pg_table);
 631                         }
 632
 633                         pmd_populate_kernel(NULL, pmd, __va(pg_table));
 634
 635                         /* now change pg_table to kernel virtual addresses */
 636
 637                         pg_table = (pte_t *) __va(pg_table) + start_pte;
 638                         for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) {
 639                                 pte_t pte;
 640
 641                                 /*
 642                                  * Map the fault vector writable so we can
 643                                  * write the HPMC checksum.
 644                                  */
 645 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 646                                 if (address >= ro_start && address < ro_end
 647                                                         && address != fv_addr
 648                                                         && address != gw_addr)
 649                                     pte = __mk_pte(address, PAGE_KERNEL_RO);
 650                                 else
 651 #endif
 652                                     pte = __mk_pte(address, pgprot);
 653
 654                                 if (address >= end_paddr)
 655                                         pte_val(pte) = 0;
 656
 657                                 set_pte(pg_table, pte);
 658
 659                                 address += PAGE_SIZE;
 660                         }
 661                         start_pte = 0;
 662
 663                         if (address >= end_paddr)
 664                             break;
 665                 }
 666                 start_pmd = 0;
 667         }
 668 }
 669
 670 /*
 671  * pagetable_init() sets up the page tables
 672  *
 673  * Note that gateway_init() places the Linux gateway page at page 0.
 674  * Since gateway pages cannot be dereferenced this has the desirable
 675  * side effect of trapping those pesky NULL-reference errors in the
 676  * kernel.
 677  */
 678 static void __init pagetable_init(void)
 679 {
 680         int range;
 681
 682         /* Map each physical memory range to its kernel vaddr */
 683
 684         for (range = 0; range < npmem_ranges; range++) {
 685                 unsigned long start_paddr;
 686                 unsigned long end_paddr;
 687                 unsigned long size;
 688
 689                 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
 690                 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
 691                 size = pmem_ranges[range].pages << PAGE_SHIFT;
 692
 693                 map_pages((unsigned long)__va(start_paddr), start_paddr,
 694                         size, PAGE_KERNEL);
 695         }
 696
 697 #ifdef CONFIG_BLK_DEV_INITRD
 698         if (initrd_end && initrd_end > mem_limit) {
 699                 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
 700                 map_pages(initrd_start, __pa(initrd_start),
 701                         initrd_end - initrd_start, PAGE_KERNEL);
 702         }
 703 #endif
 704
 705         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
 706         memset(empty_zero_page, 0, PAGE_SIZE);
 707 }
 708
 709 static void __init gateway_init(void)
 710 {
 711         unsigned long linux_gateway_page_addr;
 712         /* FIXME: This is 'const' in order to trick the compiler
 713            into not treating it as DP-relative data. */
 714         extern void * const linux_gateway_page;
 715
 716         linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
 717
 718         /*
 719          * Setup Linux Gateway page.
 720          *
 721          * The Linux gateway page will reside in kernel space (on virtual
 722          * page 0), so it doesn't need to be aliased into user space.
 723          */
 724
 725         map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
 726                 PAGE_SIZE, PAGE_GATEWAY);
 727 }
 728
 729 #ifdef CONFIG_HPUX
 730 void
 731 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
 732 {
 733         pgd_t *pg_dir;
 734         pmd_t *pmd;
 735         pte_t *pg_table;
 736         unsigned long start_pmd;
 737         unsigned long start_pte;
 738         unsigned long address;
 739         unsigned long hpux_gw_page_addr;
 740         /* FIXME: This is 'const' in order to trick the compiler
 741            into not treating it as DP-relative data. */
 742         extern void * const hpux_gateway_page;
 743
 744         hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
 745
 746         /*
 747          * Setup HP-UX Gateway page.
 748          *
 749          * The HP-UX gateway page resides in the user address space,
 750          * so it needs to be aliased into each process.
 751          */
 752
 753         pg_dir = pgd_offset(mm,hpux_gw_page_addr);
 754
 755 #if PTRS_PER_PMD == 1
 756         start_pmd = 0;
 757 #else
 758         start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 759 #endif
 760         start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 761
 762         address = __pa(&hpux_gateway_page);
 763 #if PTRS_PER_PMD == 1
 764         pmd = (pmd_t *)__pa(pg_dir);
 765 #else
 766         pmd = (pmd_t *) pgd_address(*pg_dir);
 767
 768         /*
 769          * pmd is physical at this point
 770          */
 771
 772         if (!pmd) {
 773                 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
 774                 pmd = (pmd_t *) __pa(pmd);
 775         }
 776
 777         __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
 778 #endif
 779         /* now change pmd to kernel virtual addresses */
 780
 781         pmd = (pmd_t *)__va(pmd) + start_pmd;
 782
 783         /*
 784          * pg_table is physical at this point
 785          */
 786
 787         pg_table = (pte_t *) pmd_address(*pmd);
 788         if (!pg_table)
 789                 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
 790
 791         __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
 792
 793         /* now change pg_table to kernel virtual addresses */
 794
 795         pg_table = (pte_t *) __va(pg_table) + start_pte;
 796         set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
 797 }
 798 EXPORT_SYMBOL(map_hpux_gateway_page);
 799 #endif
 800
 801 void __init paging_init(void)
 802 {
 803         int i;
 804
 805         setup_bootmem();
 806         pagetable_init();
 807         gateway_init();
 808         flush_cache_all_local(); /* start with known state */
 809         flush_tlb_all_local(NULL);
 810
 811         for (i = 0; i < npmem_ranges; i++) {
 812                 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
 813
 814                 /* We have an IOMMU, so all memory can go into a single
 815                    ZONE_DMA zone. */
 816                 zones_size[ZONE_DMA] = pmem_ranges[i].pages;
 817
 818 #ifdef CONFIG_DISCONTIGMEM
 819                 /* Need to initialize the pfnnid_map before we can initialize
 820                    the zone */
 821                 {
 822                     int j;
 823                     for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
 824                          j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
 825                          j++) {
 826                         pfnnid_map[j] = i;
 827                     }
 828                 }
 829 #endif
 830
 831                 free_area_init_node(i, NODE_DATA(i), zones_size,
 832                                 pmem_ranges[i].start_pfn, NULL);
 833         }
 834 }
 835
 836 #ifdef CONFIG_PA20
 837
 838 /*
 839  * Currently, all PA20 chips have 18 bit protection id's, which is the
 840  * limiting factor (space ids are 32 bits).
 841  */
 842
 843 #define NR_SPACE_IDS 262144
 844
 845 #else
 846
 847 /*
 848  * Currently we have a one-to-one relationship between space id's and
 849  * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
 850  * support 15 bit protection id's, so that is the limiting factor.
 851  * PCXT' has 18 bit protection id's, but only 16 bit spaceids, so it's
 852  * probably not worth the effort for a special case here.
 853  */
 854
 855 #define NR_SPACE_IDS 32768
 856
 857 #endif  /* !CONFIG_PA20 */
 858
 859 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
 860 #define SID_ARRAY_SIZE  (NR_SPACE_IDS / (8 * sizeof(long)))
 861
 862 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
 863 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
 864 static unsigned long space_id_index;
 865 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
 866 static unsigned long dirty_space_ids = 0;
 867
 868 static DEFINE_SPINLOCK(sid_lock);
 869
 870 unsigned long alloc_sid(void)
 871 {
 872         unsigned long index;
 873
 874         spin_lock(&sid_lock);
 875
 876         if (free_space_ids == 0) {
 877                 if (dirty_space_ids != 0) {
 878                         spin_unlock(&sid_lock);
 879                         flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
 880                         spin_lock(&sid_lock);
 881                 }
 882                 BUG_ON(free_space_ids == 0);
 883         }
 884
 885         free_space_ids--;
 886
 887         index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
 888         space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
 889         space_id_index = index;
 890
 891         spin_unlock(&sid_lock);
 892
 893         return index << SPACEID_SHIFT;
 894 }
 895
 896 void free_sid(unsigned long spaceid)
 897 {
 898         unsigned long index = spaceid >> SPACEID_SHIFT;
 899         unsigned long *dirty_space_offset;
 900
 901         dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
 902         index &= (BITS_PER_LONG - 1);
 903
 904         spin_lock(&sid_lock);
 905
 906         BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
 907
 908         *dirty_space_offset |= (1L << index);
 909         dirty_space_ids++;
 910
 911         spin_unlock(&sid_lock);
 912 }
 913
 914
 915 #ifdef CONFIG_SMP
 916 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
 917 {
 918         int i;
 919
 920         /* NOTE: sid_lock must be held upon entry */
 921
 922         *ndirtyptr = dirty_space_ids;
 923         if (dirty_space_ids != 0) {
 924             for (i = 0; i < SID_ARRAY_SIZE; i++) {
 925                 dirty_array[i] = dirty_space_id[i];
 926                 dirty_space_id[i] = 0;
 927             }
 928             dirty_space_ids = 0;
 929         }
 930
 931         return;
 932 }
 933
 934 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
 935 {
 936         int i;
 937
 938         /* NOTE: sid_lock must be held upon entry */
 939
 940         if (ndirty != 0) {
 941                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 942                         space_id[i] ^= dirty_array[i];
 943                 }
 944
 945                 free_space_ids += ndirty;
 946                 space_id_index = 0;
 947         }
 948 }
 949
 950 #else /* CONFIG_SMP */
 951
 952 static void recycle_sids(void)
 953 {
 954         int i;
 955
 956         /* NOTE: sid_lock must be held upon entry */
 957
 958         if (dirty_space_ids != 0) {
 959                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 960                         space_id[i] ^= dirty_space_id[i];
 961                         dirty_space_id[i] = 0;
 962                 }
 963
 964                 free_space_ids += dirty_space_ids;
 965                 dirty_space_ids = 0;
 966                 space_id_index = 0;
 967         }
 968 }
 969 #endif
 970
 971 /*
 972  * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
 973  * purged, we can safely reuse the space ids that were released but
 974  * not flushed from the tlb.
 975  */
 976
 977 #ifdef CONFIG_SMP
 978
 979 static unsigned long recycle_ndirty;
 980 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
 981 static unsigned int recycle_inuse;
 982
 983 void flush_tlb_all(void)
 984 {
 985         int do_recycle;
 986
 987         do_recycle = 0;
 988         spin_lock(&sid_lock);
 989         if (dirty_space_ids > RECYCLE_THRESHOLD) {
 990             BUG_ON(recycle_inuse);  /* FIXME: Use a semaphore/wait queue here */
 991             get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
 992             recycle_inuse++;
 993             do_recycle++;
 994         }
 995         spin_unlock(&sid_lock);
 996         on_each_cpu(flush_tlb_all_local, NULL, 1, 1);
 997         if (do_recycle) {
 998             spin_lock(&sid_lock);
 999             recycle_sids(recycle_ndirty,recycle_dirty_array);
1000             recycle_inuse = 0;
1001             spin_unlock(&sid_lock);
1002         }
1003 }
1004 #else
1005 void flush_tlb_all(void)
1006 {
1007         spin_lock(&sid_lock);
1008         flush_tlb_all_local(NULL);
1009         recycle_sids();
1010         spin_unlock(&sid_lock);
1011 }
1012 #endif
1013
1014 #ifdef CONFIG_BLK_DEV_INITRD
1015 void free_initrd_mem(unsigned long start, unsigned long end)
1016 {
1017         if (start >= end)
1018                 return;
1019         printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1020         for (; start < end; start += PAGE_SIZE) {
1021                 ClearPageReserved(virt_to_page(start));
1022                 init_page_count(virt_to_page(start));
1023                 free_page(start);
1024                 num_physpages++;
1025                 totalram_pages++;
1026         }
1027 }
1028 #endif