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  *
  10  */
  11
  12 #include <linux/config.h>
  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
  31 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  32
  33 extern char _text;      /* start of kernel code, defined by linker */
  34 extern int  data_start;
  35 extern char _end;       /* end of BSS, defined by linker */
  36 extern char __init_begin, __init_end;
  37
  38 #ifdef CONFIG_DISCONTIGMEM
  39 struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
  40 bootmem_data_t bmem_data[MAX_NUMNODES] __read_mostly;
  41 unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
  42 #endif
  43
  44 static struct resource data_resource = {
  45         .name   = "Kernel data",
  46         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  47 };
  48
  49 static struct resource code_resource = {
  50         .name   = "Kernel code",
  51         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  52 };
  53
  54 static struct resource pdcdata_resource = {
  55         .name   = "PDC data (Page Zero)",
  56         .start  = 0,
  57         .end    = 0x9ff,
  58         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  59 };
  60
  61 static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
  62
  63 /* The following array is initialized from the firmware specific
  64  * information retrieved in kernel/inventory.c.
  65  */
  66
  67 physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
  68 int npmem_ranges __read_mostly;
  69
  70 #ifdef __LP64__
  71 #define MAX_MEM         (~0UL)
  72 #else /* !__LP64__ */
  73 #define MAX_MEM         (3584U*1024U*1024U)
  74 #endif /* !__LP64__ */
  75
  76 static unsigned long mem_limit __read_mostly = MAX_MEM;
  77
  78 static void __init mem_limit_func(void)
  79 {
  80         char *cp, *end;
  81         unsigned long limit;
  82         extern char saved_command_line[];
  83
  84         /* We need this before __setup() functions are called */
  85
  86         limit = MAX_MEM;
  87         for (cp = saved_command_line; *cp; ) {
  88                 if (memcmp(cp, "mem=", 4) == 0) {
  89                         cp += 4;
  90                         limit = memparse(cp, &end);
  91                         if (end != cp)
  92                                 break;
  93                         cp = end;
  94                 } else {
  95                         while (*cp != ' ' && *cp)
  96                                 ++cp;
  97                         while (*cp == ' ')
  98                                 ++cp;
  99                 }
 100         }
 101
 102         if (limit < mem_limit)
 103                 mem_limit = limit;
 104 }
 105
 106 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
 107
 108 static void __init setup_bootmem(void)
 109 {
 110         unsigned long bootmap_size;
 111         unsigned long mem_max;
 112         unsigned long bootmap_pages;
 113         unsigned long bootmap_start_pfn;
 114         unsigned long bootmap_pfn;
 115 #ifndef CONFIG_DISCONTIGMEM
 116         physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
 117         int npmem_holes;
 118 #endif
 119         int i, sysram_resource_count;
 120
 121         disable_sr_hashing(); /* Turn off space register hashing */
 122
 123         /*
 124          * Sort the ranges. Since the number of ranges is typically
 125          * small, and performance is not an issue here, just do
 126          * a simple insertion sort.
 127          */
 128
 129         for (i = 1; i < npmem_ranges; i++) {
 130                 int j;
 131
 132                 for (j = i; j > 0; j--) {
 133                         unsigned long tmp;
 134
 135                         if (pmem_ranges[j-1].start_pfn <
 136                             pmem_ranges[j].start_pfn) {
 137
 138                                 break;
 139                         }
 140                         tmp = pmem_ranges[j-1].start_pfn;
 141                         pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
 142                         pmem_ranges[j].start_pfn = tmp;
 143                         tmp = pmem_ranges[j-1].pages;
 144                         pmem_ranges[j-1].pages = pmem_ranges[j].pages;
 145                         pmem_ranges[j].pages = tmp;
 146                 }
 147         }
 148
 149 #ifndef CONFIG_DISCONTIGMEM
 150         /*
 151          * Throw out ranges that are too far apart (controlled by
 152          * MAX_GAP).
 153          */
 154
 155         for (i = 1; i < npmem_ranges; i++) {
 156                 if (pmem_ranges[i].start_pfn -
 157                         (pmem_ranges[i-1].start_pfn +
 158                          pmem_ranges[i-1].pages) > MAX_GAP) {
 159                         npmem_ranges = i;
 160                         printk("Large gap in memory detected (%ld pages). "
 161                                "Consider turning on CONFIG_DISCONTIGMEM\n",
 162                                pmem_ranges[i].start_pfn -
 163                                (pmem_ranges[i-1].start_pfn +
 164                                 pmem_ranges[i-1].pages));
 165                         break;
 166                 }
 167         }
 168 #endif
 169
 170         if (npmem_ranges > 1) {
 171
 172                 /* Print the memory ranges */
 173
 174                 printk(KERN_INFO "Memory Ranges:\n");
 175
 176                 for (i = 0; i < npmem_ranges; i++) {
 177                         unsigned long start;
 178                         unsigned long size;
 179
 180                         size = (pmem_ranges[i].pages << PAGE_SHIFT);
 181                         start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
 182                         printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
 183                                 i,start, start + (size - 1), size >> 20);
 184                 }
 185         }
 186
 187         sysram_resource_count = npmem_ranges;
 188         for (i = 0; i < sysram_resource_count; i++) {
 189                 struct resource *res = &sysram_resources[i];
 190                 res->name = "System RAM";
 191                 res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT;
 192                 res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1;
 193                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 194                 request_resource(&iomem_resource, res);
 195         }
 196
 197         /*
 198          * For 32 bit kernels we limit the amount of memory we can
 199          * support, in order to preserve enough kernel address space
 200          * for other purposes. For 64 bit kernels we don't normally
 201          * limit the memory, but this mechanism can be used to
 202          * artificially limit the amount of memory (and it is written
 203          * to work with multiple memory ranges).
 204          */
 205
 206         mem_limit_func();       /* check for "mem=" argument */
 207
 208         mem_max = 0;
 209         num_physpages = 0;
 210         for (i = 0; i < npmem_ranges; i++) {
 211                 unsigned long rsize;
 212
 213                 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
 214                 if ((mem_max + rsize) > mem_limit) {
 215                         printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
 216                         if (mem_max == mem_limit)
 217                                 npmem_ranges = i;
 218                         else {
 219                                 pmem_ranges[i].pages =   (mem_limit >> PAGE_SHIFT)
 220                                                        - (mem_max >> PAGE_SHIFT);
 221                                 npmem_ranges = i + 1;
 222                                 mem_max = mem_limit;
 223                         }
 224                 num_physpages += pmem_ranges[i].pages;
 225                         break;
 226                 }
 227             num_physpages += pmem_ranges[i].pages;
 228                 mem_max += rsize;
 229         }
 230
 231         printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
 232
 233 #ifndef CONFIG_DISCONTIGMEM
 234         /* Merge the ranges, keeping track of the holes */
 235
 236         {
 237                 unsigned long end_pfn;
 238                 unsigned long hole_pages;
 239
 240                 npmem_holes = 0;
 241                 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
 242                 for (i = 1; i < npmem_ranges; i++) {
 243
 244                         hole_pages = pmem_ranges[i].start_pfn - end_pfn;
 245                         if (hole_pages) {
 246                                 pmem_holes[npmem_holes].start_pfn = end_pfn;
 247                                 pmem_holes[npmem_holes++].pages = hole_pages;
 248                                 end_pfn += hole_pages;
 249                         }
 250                         end_pfn += pmem_ranges[i].pages;
 251                 }
 252
 253                 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
 254                 npmem_ranges = 1;
 255         }
 256 #endif
 257
 258         bootmap_pages = 0;
 259         for (i = 0; i < npmem_ranges; i++)
 260                 bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages);
 261
 262         bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT;
 263
 264 #ifdef CONFIG_DISCONTIGMEM
 265         for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
 266                 memset(NODE_DATA(i), 0, sizeof(pg_data_t));
 267                 NODE_DATA(i)->bdata = &bmem_data[i];
 268         }
 269         memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
 270
 271         for (i = 0; i < npmem_ranges; i++)
 272                 node_set_online(i);
 273 #endif
 274
 275         /*
 276          * Initialize and free the full range of memory in each range.
 277          * Note that the only writing these routines do are to the bootmap,
 278          * and we've made sure to locate the bootmap properly so that they
 279          * won't be writing over anything important.
 280          */
 281
 282         bootmap_pfn = bootmap_start_pfn;
 283         max_pfn = 0;
 284         for (i = 0; i < npmem_ranges; i++) {
 285                 unsigned long start_pfn;
 286                 unsigned long npages;
 287
 288                 start_pfn = pmem_ranges[i].start_pfn;
 289                 npages = pmem_ranges[i].pages;
 290
 291                 bootmap_size = init_bootmem_node(NODE_DATA(i),
 292                                                 bootmap_pfn,
 293                                                 start_pfn,
 294                                                 (start_pfn + npages) );
 295                 free_bootmem_node(NODE_DATA(i),
 296                                   (start_pfn << PAGE_SHIFT),
 297                                   (npages << PAGE_SHIFT) );
 298                 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 299                 if ((start_pfn + npages) > max_pfn)
 300                         max_pfn = start_pfn + npages;
 301         }
 302
 303         /* IOMMU is always used to access "high mem" on those boxes
 304          * that can support enough mem that a PCI device couldn't
 305          * directly DMA to any physical addresses.
 306          * ISA DMA support will need to revisit this.
 307          */
 308         max_low_pfn = max_pfn;
 309
 310         if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) {
 311                 printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n");
 312                 BUG();
 313         }
 314
 315         /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
 316
 317 #define PDC_CONSOLE_IO_IODC_SIZE 32768
 318
 319         reserve_bootmem_node(NODE_DATA(0), 0UL,
 320                         (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE));
 321         reserve_bootmem_node(NODE_DATA(0),__pa((unsigned long)&_text),
 322                         (unsigned long)(&_end - &_text));
 323         reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
 324                         ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT));
 325
 326 #ifndef CONFIG_DISCONTIGMEM
 327
 328         /* reserve the holes */
 329
 330         for (i = 0; i < npmem_holes; i++) {
 331                 reserve_bootmem_node(NODE_DATA(0),
 332                                 (pmem_holes[i].start_pfn << PAGE_SHIFT),
 333                                 (pmem_holes[i].pages << PAGE_SHIFT));
 334         }
 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), initrd_reserve);
 352                 }
 353         }
 354 #endif
 355
 356         data_resource.start =  virt_to_phys(&data_start);
 357         data_resource.end = virt_to_phys(&_end)-1;
 358         code_resource.start = virt_to_phys(&_text);
 359         code_resource.end = virt_to_phys(&data_start)-1;
 360
 361         /* We don't know which region the kernel will be in, so try
 362          * all of them.
 363          */
 364         for (i = 0; i < sysram_resource_count; i++) {
 365                 struct resource *res = &sysram_resources[i];
 366                 request_resource(res, &code_resource);
 367                 request_resource(res, &data_resource);
 368         }
 369         request_resource(&sysram_resources[0], &pdcdata_resource);
 370 }
 371
 372 void free_initmem(void)
 373 {
 374         /* FIXME: */
 375 #if 0
 376         printk(KERN_INFO "NOT FREEING INITMEM (%dk)\n",
 377                         (&__init_end - &__init_begin) >> 10);
 378         return;
 379 #else
 380         unsigned long addr;
 381
 382         printk(KERN_INFO "Freeing unused kernel memory: ");
 383
 384 #if 1
 385         /* Attempt to catch anyone trying to execute code here
 386          * by filling the page with BRK insns.
 387          *
 388          * If we disable interrupts for all CPUs, then IPI stops working.
 389          * Kinda breaks the global cache flushing.
 390          */
 391         local_irq_disable();
 392
 393         memset(&__init_begin, 0x00,
 394                 (unsigned long)&__init_end - (unsigned long)&__init_begin);
 395
 396         flush_data_cache();
 397         asm volatile("sync" : : );
 398         flush_icache_range((unsigned long)&__init_begin, (unsigned long)&__init_end);
 399         asm volatile("sync" : : );
 400
 401         local_irq_enable();
 402 #endif
 403
 404         addr = (unsigned long)(&__init_begin);
 405         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 406                 ClearPageReserved(virt_to_page(addr));
 407                 set_page_count(virt_to_page(addr), 1);
 408                 free_page(addr);
 409                 num_physpages++;
 410                 totalram_pages++;
 411         }
 412
 413         /* set up a new led state on systems shipped LED State panel */
 414         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
 415
 416         printk("%luk freed\n", (unsigned long)(&__init_end - &__init_begin) >> 10);
 417 #endif
 418 }
 419
 420
 421 #ifdef CONFIG_DEBUG_RODATA
 422 void mark_rodata_ro(void)
 423 {
 424         extern char __start_rodata, __end_rodata;
 425         /* rodata memory was already mapped with KERNEL_RO access rights by
 426            pagetable_init() and map_pages(). No need to do additional stuff here */
 427         printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
 428                 (unsigned long)(&__end_rodata - &__start_rodata) >> 10);
 429 }
 430 #endif
 431
 432
 433 /*
 434  * Just an arbitrary offset to serve as a "hole" between mapping areas
 435  * (between top of physical memory and a potential pcxl dma mapping
 436  * area, and below the vmalloc mapping area).
 437  *
 438  * The current 32K value just means that there will be a 32K "hole"
 439  * between mapping areas. That means that  any out-of-bounds memory
 440  * accesses will hopefully be caught. The vmalloc() routines leaves
 441  * a hole of 4kB between each vmalloced area for the same reason.
 442  */
 443
 444  /* Leave room for gateway page expansion */
 445 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
 446 #error KERNEL_MAP_START is in gateway reserved region
 447 #endif
 448 #define MAP_START (KERNEL_MAP_START)
 449
 450 #define VM_MAP_OFFSET  (32*1024)
 451 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 452                                      & ~(VM_MAP_OFFSET-1)))
 453
 454 void *vmalloc_start __read_mostly;
 455 EXPORT_SYMBOL(vmalloc_start);
 456
 457 #ifdef CONFIG_PA11
 458 unsigned long pcxl_dma_start __read_mostly;
 459 #endif
 460
 461 void __init mem_init(void)
 462 {
 463         high_memory = __va((max_pfn << PAGE_SHIFT));
 464
 465 #ifndef CONFIG_DISCONTIGMEM
 466         max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
 467         totalram_pages += free_all_bootmem();
 468 #else
 469         {
 470                 int i;
 471
 472                 for (i = 0; i < npmem_ranges; i++)
 473                         totalram_pages += free_all_bootmem_node(NODE_DATA(i));
 474         }
 475 #endif
 476
 477         printk(KERN_INFO "Memory: %luk available\n", num_physpages << (PAGE_SHIFT-10));
 478
 479 #ifdef CONFIG_PA11
 480         if (hppa_dma_ops == &pcxl_dma_ops) {
 481                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
 482                 vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE);
 483         } else {
 484                 pcxl_dma_start = 0;
 485                 vmalloc_start = SET_MAP_OFFSET(MAP_START);
 486         }
 487 #else
 488         vmalloc_start = SET_MAP_OFFSET(MAP_START);
 489 #endif
 490
 491 }
 492
 493 unsigned long *empty_zero_page __read_mostly;
 494
 495 void show_mem(void)
 496 {
 497         int i,free = 0,total = 0,reserved = 0;
 498         int shared = 0, cached = 0;
 499
 500         printk(KERN_INFO "Mem-info:\n");
 501         show_free_areas();
 502         printk(KERN_INFO "Free swap:     %6ldkB\n",
 503                                 nr_swap_pages<<(PAGE_SHIFT-10));
 504 #ifndef CONFIG_DISCONTIGMEM
 505         i = max_mapnr;
 506         while (i-- > 0) {
 507                 total++;
 508                 if (PageReserved(mem_map+i))
 509                         reserved++;
 510                 else if (PageSwapCache(mem_map+i))
 511                         cached++;
 512                 else if (!page_count(&mem_map[i]))
 513                         free++;
 514                 else
 515                         shared += page_count(&mem_map[i]) - 1;
 516         }
 517 #else
 518         for (i = 0; i < npmem_ranges; i++) {
 519                 int j;
 520
 521                 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
 522                         struct page *p;
 523                         unsigned long flags;
 524
 525                         pgdat_resize_lock(NODE_DATA(i), &flags);
 526                         p = nid_page_nr(i, j) - node_start_pfn(i);
 527
 528                         total++;
 529                         if (PageReserved(p))
 530                                 reserved++;
 531                         else if (PageSwapCache(p))
 532                                 cached++;
 533                         else if (!page_count(p))
 534                                 free++;
 535                         else
 536                                 shared += page_count(p) - 1;
 537                         pgdat_resize_unlock(NODE_DATA(i), &flags);
 538                 }
 539         }
 540 #endif
 541         printk(KERN_INFO "%d pages of RAM\n", total);
 542         printk(KERN_INFO "%d reserved pages\n", reserved);
 543         printk(KERN_INFO "%d pages shared\n", shared);
 544         printk(KERN_INFO "%d pages swap cached\n", cached);
 545
 546
 547 #ifdef CONFIG_DISCONTIGMEM
 548         {
 549                 struct zonelist *zl;
 550                 int i, j, k;
 551
 552                 for (i = 0; i < npmem_ranges; i++) {
 553                         for (j = 0; j < MAX_NR_ZONES; j++) {
 554                                 zl = NODE_DATA(i)->node_zonelists + j;
 555
 556                                 printk("Zone list for zone %d on node %d: ", j, i);
 557                                 for (k = 0; zl->zones[k] != NULL; k++)
 558                                         printk("[%d/%s] ", zl->zones[k]->zone_pgdat->node_id, zl->zones[k]->name);
 559                                 printk("\n");
 560                         }
 561                 }
 562         }
 563 #endif
 564 }
 565
 566
 567 static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot)
 568 {
 569         pgd_t *pg_dir;
 570         pmd_t *pmd;
 571         pte_t *pg_table;
 572         unsigned long end_paddr;
 573         unsigned long start_pmd;
 574         unsigned long start_pte;
 575         unsigned long tmp1;
 576         unsigned long tmp2;
 577         unsigned long address;
 578         unsigned long ro_start;
 579         unsigned long ro_end;
 580         unsigned long fv_addr;
 581         unsigned long gw_addr;
 582         extern const unsigned long fault_vector_20;
 583         extern void * const linux_gateway_page;
 584
 585         ro_start = __pa((unsigned long)&_text);
 586         ro_end   = __pa((unsigned long)&data_start);
 587         fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
 588         gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
 589
 590         end_paddr = start_paddr + size;
 591
 592         pg_dir = pgd_offset_k(start_vaddr);
 593
 594 #if PTRS_PER_PMD == 1
 595         start_pmd = 0;
 596 #else
 597         start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 598 #endif
 599         start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 600
 601         address = start_paddr;
 602         while (address < end_paddr) {
 603 #if PTRS_PER_PMD == 1
 604                 pmd = (pmd_t *)__pa(pg_dir);
 605 #else
 606                 pmd = (pmd_t *)pgd_address(*pg_dir);
 607
 608                 /*
 609                  * pmd is physical at this point
 610                  */
 611
 612                 if (!pmd) {
 613                         pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER);
 614                         pmd = (pmd_t *) __pa(pmd);
 615                 }
 616
 617                 pgd_populate(NULL, pg_dir, __va(pmd));
 618 #endif
 619                 pg_dir++;
 620
 621                 /* now change pmd to kernel virtual addresses */
 622
 623                 pmd = (pmd_t *)__va(pmd) + start_pmd;
 624                 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) {
 625
 626                         /*
 627                          * pg_table is physical at this point
 628                          */
 629
 630                         pg_table = (pte_t *)pmd_address(*pmd);
 631                         if (!pg_table) {
 632                                 pg_table = (pte_t *)
 633                                         alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE);
 634                                 pg_table = (pte_t *) __pa(pg_table);
 635                         }
 636
 637                         pmd_populate_kernel(NULL, pmd, __va(pg_table));
 638
 639                         /* now change pg_table to kernel virtual addresses */
 640
 641                         pg_table = (pte_t *) __va(pg_table) + start_pte;
 642                         for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) {
 643                                 pte_t pte;
 644
 645                                 /*
 646                                  * Map the fault vector writable so we can
 647                                  * write the HPMC checksum.
 648                                  */
 649                                 if (address >= ro_start && address < ro_end
 650                                                         && address != fv_addr
 651                                                         && address != gw_addr)
 652                                     pte = __mk_pte(address, PAGE_KERNEL_RO);
 653                                 else
 654                                     pte = __mk_pte(address, pgprot);
 655
 656                                 if (address >= end_paddr)
 657                                         pte_val(pte) = 0;
 658
 659                                 set_pte(pg_table, pte);
 660
 661                                 address += PAGE_SIZE;
 662                         }
 663                         start_pte = 0;
 664
 665                         if (address >= end_paddr)
 666                             break;
 667                 }
 668                 start_pmd = 0;
 669         }
 670 }
 671
 672 /*
 673  * pagetable_init() sets up the page tables
 674  *
 675  * Note that gateway_init() places the Linux gateway page at page 0.
 676  * Since gateway pages cannot be dereferenced this has the desirable
 677  * side effect of trapping those pesky NULL-reference errors in the
 678  * kernel.
 679  */
 680 static void __init pagetable_init(void)
 681 {
 682         int range;
 683
 684         /* Map each physical memory range to its kernel vaddr */
 685
 686         for (range = 0; range < npmem_ranges; range++) {
 687                 unsigned long start_paddr;
 688                 unsigned long end_paddr;
 689                 unsigned long size;
 690
 691                 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
 692                 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
 693                 size = pmem_ranges[range].pages << PAGE_SHIFT;
 694
 695                 map_pages((unsigned long)__va(start_paddr), start_paddr,
 696                         size, PAGE_KERNEL);
 697         }
 698
 699 #ifdef CONFIG_BLK_DEV_INITRD
 700         if (initrd_end && initrd_end > mem_limit) {
 701                 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
 702                 map_pages(initrd_start, __pa(initrd_start),
 703                         initrd_end - initrd_start, PAGE_KERNEL);
 704         }
 705 #endif
 706
 707         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
 708         memset(empty_zero_page, 0, PAGE_SIZE);
 709 }
 710
 711 static void __init gateway_init(void)
 712 {
 713         unsigned long linux_gateway_page_addr;
 714         /* FIXME: This is 'const' in order to trick the compiler
 715            into not treating it as DP-relative data. */
 716         extern void * const linux_gateway_page;
 717
 718         linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
 719
 720         /*
 721          * Setup Linux Gateway page.
 722          *
 723          * The Linux gateway page will reside in kernel space (on virtual
 724          * page 0), so it doesn't need to be aliased into user space.
 725          */
 726
 727         map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
 728                 PAGE_SIZE, PAGE_GATEWAY);
 729 }
 730
 731 #ifdef CONFIG_HPUX
 732 void
 733 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
 734 {
 735         pgd_t *pg_dir;
 736         pmd_t *pmd;
 737         pte_t *pg_table;
 738         unsigned long start_pmd;
 739         unsigned long start_pte;
 740         unsigned long address;
 741         unsigned long hpux_gw_page_addr;
 742         /* FIXME: This is 'const' in order to trick the compiler
 743            into not treating it as DP-relative data. */
 744         extern void * const hpux_gateway_page;
 745
 746         hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
 747
 748         /*
 749          * Setup HP-UX Gateway page.
 750          *
 751          * The HP-UX gateway page resides in the user address space,
 752          * so it needs to be aliased into each process.
 753          */
 754
 755         pg_dir = pgd_offset(mm,hpux_gw_page_addr);
 756
 757 #if PTRS_PER_PMD == 1
 758         start_pmd = 0;
 759 #else
 760         start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 761 #endif
 762         start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 763
 764         address = __pa(&hpux_gateway_page);
 765 #if PTRS_PER_PMD == 1
 766         pmd = (pmd_t *)__pa(pg_dir);
 767 #else
 768         pmd = (pmd_t *) pgd_address(*pg_dir);
 769
 770         /*
 771          * pmd is physical at this point
 772          */
 773
 774         if (!pmd) {
 775                 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
 776                 pmd = (pmd_t *) __pa(pmd);
 777         }
 778
 779         __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
 780 #endif
 781         /* now change pmd to kernel virtual addresses */
 782
 783         pmd = (pmd_t *)__va(pmd) + start_pmd;
 784
 785         /*
 786          * pg_table is physical at this point
 787          */
 788
 789         pg_table = (pte_t *) pmd_address(*pmd);
 790         if (!pg_table)
 791                 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
 792
 793         __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
 794
 795         /* now change pg_table to kernel virtual addresses */
 796
 797         pg_table = (pte_t *) __va(pg_table) + start_pte;
 798         set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
 799 }
 800 EXPORT_SYMBOL(map_hpux_gateway_page);
 801 #endif
 802
 803 void __init paging_init(void)
 804 {
 805         int i;
 806
 807         setup_bootmem();
 808         pagetable_init();
 809         gateway_init();
 810         flush_cache_all_local(); /* start with known state */
 811         flush_tlb_all_local(NULL);
 812
 813         for (i = 0; i < npmem_ranges; i++) {
 814                 unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0 };
 815
 816                 /* We have an IOMMU, so all memory can go into a single
 817                    ZONE_DMA zone. */
 818                 zones_size[ZONE_DMA] = pmem_ranges[i].pages;
 819
 820 #ifdef CONFIG_DISCONTIGMEM
 821                 /* Need to initialize the pfnnid_map before we can initialize
 822                    the zone */
 823                 {
 824                     int j;
 825                     for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
 826                          j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
 827                          j++) {
 828                         pfnnid_map[j] = i;
 829                     }
 830                 }
 831 #endif
 832
 833                 free_area_init_node(i, NODE_DATA(i), zones_size,
 834                                 pmem_ranges[i].start_pfn, NULL);
 835         }
 836 }
 837
 838 #ifdef CONFIG_PA20
 839
 840 /*
 841  * Currently, all PA20 chips have 18 bit protection id's, which is the
 842  * limiting factor (space ids are 32 bits).
 843  */
 844
 845 #define NR_SPACE_IDS 262144
 846
 847 #else
 848
 849 /*
 850  * Currently we have a one-to-one relationship between space id's and
 851  * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
 852  * support 15 bit protection id's, so that is the limiting factor.
 853  * PCXT' has 18 bit protection id's, but only 16 bit spaceids, so it's
 854  * probably not worth the effort for a special case here.
 855  */
 856
 857 #define NR_SPACE_IDS 32768
 858
 859 #endif  /* !CONFIG_PA20 */
 860
 861 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
 862 #define SID_ARRAY_SIZE  (NR_SPACE_IDS / (8 * sizeof(long)))
 863
 864 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
 865 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
 866 static unsigned long space_id_index;
 867 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
 868 static unsigned long dirty_space_ids = 0;
 869
 870 static DEFINE_SPINLOCK(sid_lock);
 871
 872 unsigned long alloc_sid(void)
 873 {
 874         unsigned long index;
 875
 876         spin_lock(&sid_lock);
 877
 878         if (free_space_ids == 0) {
 879                 if (dirty_space_ids != 0) {
 880                         spin_unlock(&sid_lock);
 881                         flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
 882                         spin_lock(&sid_lock);
 883                 }
 884                 if (free_space_ids == 0)
 885                         BUG();
 886         }
 887
 888         free_space_ids--;
 889
 890         index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
 891         space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
 892         space_id_index = index;
 893
 894         spin_unlock(&sid_lock);
 895
 896         return index << SPACEID_SHIFT;
 897 }
 898
 899 void free_sid(unsigned long spaceid)
 900 {
 901         unsigned long index = spaceid >> SPACEID_SHIFT;
 902         unsigned long *dirty_space_offset;
 903
 904         dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
 905         index &= (BITS_PER_LONG - 1);
 906
 907         spin_lock(&sid_lock);
 908
 909         if (*dirty_space_offset & (1L << index))
 910             BUG(); /* attempt to free space id twice */
 911
 912         *dirty_space_offset |= (1L << index);
 913         dirty_space_ids++;
 914
 915         spin_unlock(&sid_lock);
 916 }
 917
 918
 919 #ifdef CONFIG_SMP
 920 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
 921 {
 922         int i;
 923
 924         /* NOTE: sid_lock must be held upon entry */
 925
 926         *ndirtyptr = dirty_space_ids;
 927         if (dirty_space_ids != 0) {
 928             for (i = 0; i < SID_ARRAY_SIZE; i++) {
 929                 dirty_array[i] = dirty_space_id[i];
 930                 dirty_space_id[i] = 0;
 931             }
 932             dirty_space_ids = 0;
 933         }
 934
 935         return;
 936 }
 937
 938 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
 939 {
 940         int i;
 941
 942         /* NOTE: sid_lock must be held upon entry */
 943
 944         if (ndirty != 0) {
 945                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 946                         space_id[i] ^= dirty_array[i];
 947                 }
 948
 949                 free_space_ids += ndirty;
 950                 space_id_index = 0;
 951         }
 952 }
 953
 954 #else /* CONFIG_SMP */
 955
 956 static void recycle_sids(void)
 957 {
 958         int i;
 959
 960         /* NOTE: sid_lock must be held upon entry */
 961
 962         if (dirty_space_ids != 0) {
 963                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 964                         space_id[i] ^= dirty_space_id[i];
 965                         dirty_space_id[i] = 0;
 966                 }
 967
 968                 free_space_ids += dirty_space_ids;
 969                 dirty_space_ids = 0;
 970                 space_id_index = 0;
 971         }
 972 }
 973 #endif
 974
 975 /*
 976  * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
 977  * purged, we can safely reuse the space ids that were released but
 978  * not flushed from the tlb.
 979  */
 980
 981 #ifdef CONFIG_SMP
 982
 983 static unsigned long recycle_ndirty;
 984 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
 985 static unsigned int recycle_inuse = 0;
 986
 987 void flush_tlb_all(void)
 988 {
 989         int do_recycle;
 990
 991         do_recycle = 0;
 992         spin_lock(&sid_lock);
 993         if (dirty_space_ids > RECYCLE_THRESHOLD) {
 994             if (recycle_inuse) {
 995                 BUG();  /* FIXME: Use a semaphore/wait queue here */
 996             }
 997             get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
 998             recycle_inuse++;
 999             do_recycle++;
1000         }
1001         spin_unlock(&sid_lock);
1002         on_each_cpu(flush_tlb_all_local, NULL, 1, 1);
1003         if (do_recycle) {
1004             spin_lock(&sid_lock);
1005             recycle_sids(recycle_ndirty,recycle_dirty_array);
1006             recycle_inuse = 0;
1007             spin_unlock(&sid_lock);
1008         }
1009 }
1010 #else
1011 void flush_tlb_all(void)
1012 {
1013         spin_lock(&sid_lock);
1014         flush_tlb_all_local(NULL);
1015         recycle_sids();
1016         spin_unlock(&sid_lock);
1017 }
1018 #endif
1019
1020 #ifdef CONFIG_BLK_DEV_INITRD
1021 void free_initrd_mem(unsigned long start, unsigned long end)
1022 {
1023 #if 0
1024         if (start < end)
1025                 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1026         for (; start < end; start += PAGE_SIZE) {
1027                 ClearPageReserved(virt_to_page(start));
1028                 set_page_count(virt_to_page(start), 1);
1029                 free_page(start);
1030                 num_physpages++;
1031                 totalram_pages++;
1032         }
1033 #endif
1034 }
1035 #endif