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
  24 #include <asm/pgalloc.h>
  25 #include <asm/tlb.h>
  26 #include <asm/pdc_chassis.h>
  27 #include <asm/mmzone.h>
  28
  29 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  30
  31 extern char _text;      /* start of kernel code, defined by linker */
  32 extern int  data_start;
  33 extern char _end;       /* end of BSS, defined by linker */
  34 extern char __init_begin, __init_end;
  35
  36 #ifdef CONFIG_DISCONTIGMEM
  37 struct node_map_data node_data[MAX_NUMNODES];
  38 bootmem_data_t bmem_data[MAX_NUMNODES];
  39 unsigned char pfnnid_map[PFNNID_MAP_MAX];
  40 #endif
  41
  42 static struct resource data_resource = {
  43         .name   = "Kernel data",
  44         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  45 };
  46
  47 static struct resource code_resource = {
  48         .name   = "Kernel code",
  49         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  50 };
  51
  52 static struct resource pdcdata_resource = {
  53         .name   = "PDC data (Page Zero)",
  54         .start  = 0,
  55         .end    = 0x9ff,
  56         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  57 };
  58
  59 static struct resource sysram_resources[MAX_PHYSMEM_RANGES];
  60
  61 static unsigned long max_pfn;
  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];
  68 int npmem_ranges;
  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 = 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         numnodes = npmem_ranges;
 272
 273         for (i = 0; i < npmem_ranges; i++)
 274                 node_set_online(i);
 275 #endif
 276
 277         /*
 278          * Initialize and free the full range of memory in each range.
 279          * Note that the only writing these routines do are to the bootmap,
 280          * and we've made sure to locate the bootmap properly so that they
 281          * won't be writing over anything important.
 282          */
 283
 284         bootmap_pfn = bootmap_start_pfn;
 285         max_pfn = 0;
 286         for (i = 0; i < npmem_ranges; i++) {
 287                 unsigned long start_pfn;
 288                 unsigned long npages;
 289
 290                 start_pfn = pmem_ranges[i].start_pfn;
 291                 npages = pmem_ranges[i].pages;
 292
 293                 bootmap_size = init_bootmem_node(NODE_DATA(i),
 294                                                 bootmap_pfn,
 295                                                 start_pfn,
 296                                                 (start_pfn + npages) );
 297                 free_bootmem_node(NODE_DATA(i),
 298                                   (start_pfn << PAGE_SHIFT),
 299                                   (npages << PAGE_SHIFT) );
 300                 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 301                 if ((start_pfn + npages) > max_pfn)
 302                         max_pfn = start_pfn + npages;
 303         }
 304
 305         if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) {
 306                 printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n");
 307                 BUG();
 308         }
 309
 310         /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
 311
 312 #define PDC_CONSOLE_IO_IODC_SIZE 32768
 313
 314         reserve_bootmem_node(NODE_DATA(0), 0UL,
 315                         (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE));
 316         reserve_bootmem_node(NODE_DATA(0),__pa((unsigned long)&_text),
 317                         (unsigned long)(&_end - &_text));
 318         reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
 319                         ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT));
 320
 321 #ifndef CONFIG_DISCONTIGMEM
 322
 323         /* reserve the holes */
 324
 325         for (i = 0; i < npmem_holes; i++) {
 326                 reserve_bootmem_node(NODE_DATA(0),
 327                                 (pmem_holes[i].start_pfn << PAGE_SHIFT),
 328                                 (pmem_holes[i].pages << PAGE_SHIFT));
 329         }
 330 #endif
 331
 332 #ifdef CONFIG_BLK_DEV_INITRD
 333         if (initrd_start) {
 334                 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
 335                 if (__pa(initrd_start) < mem_max) {
 336                         unsigned long initrd_reserve;
 337
 338                         if (__pa(initrd_end) > mem_max) {
 339                                 initrd_reserve = mem_max - __pa(initrd_start);
 340                         } else {
 341                                 initrd_reserve = initrd_end - initrd_start;
 342                         }
 343                         initrd_below_start_ok = 1;
 344                         printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
 345
 346                         reserve_bootmem_node(NODE_DATA(0),__pa(initrd_start), initrd_reserve);
 347                 }
 348         }
 349 #endif
 350
 351         data_resource.start =  virt_to_phys(&data_start);
 352         data_resource.end = virt_to_phys(&_end)-1;
 353         code_resource.start = virt_to_phys(&_text);
 354         code_resource.end = virt_to_phys(&data_start)-1;
 355
 356         /* We don't know which region the kernel will be in, so try
 357          * all of them.
 358          */
 359         for (i = 0; i < sysram_resource_count; i++) {
 360                 struct resource *res = &sysram_resources[i];
 361                 request_resource(res, &code_resource);
 362                 request_resource(res, &data_resource);
 363         }
 364         request_resource(&sysram_resources[0], &pdcdata_resource);
 365 }
 366
 367 void free_initmem(void)
 368 {
 369         /* FIXME: */
 370 #if 0
 371         printk(KERN_INFO "NOT FREEING INITMEM (%dk)\n",
 372                         (&__init_end - &__init_begin) >> 10);
 373         return;
 374 #else
 375         unsigned long addr;
 376
 377         printk(KERN_INFO "Freeing unused kernel memory: ");
 378
 379 #if 1
 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         addr = (unsigned long)(&__init_begin);
 400         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 401                 ClearPageReserved(virt_to_page(addr));
 402                 set_page_count(virt_to_page(addr), 1);
 403                 free_page(addr);
 404                 num_physpages++;
 405                 totalram_pages++;
 406         }
 407
 408         /* set up a new led state on systems shipped LED State panel */
 409         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
 410
 411         printk("%luk freed\n", (unsigned long)(&__init_end - &__init_begin) >> 10);
 412 #endif
 413 }
 414
 415 /*
 416  * Just an arbitrary offset to serve as a "hole" between mapping areas
 417  * (between top of physical memory and a potential pcxl dma mapping
 418  * area, and below the vmalloc mapping area).
 419  *
 420  * The current 32K value just means that there will be a 32K "hole"
 421  * between mapping areas. That means that  any out-of-bounds memory
 422  * accesses will hopefully be caught. The vmalloc() routines leaves
 423  * a hole of 4kB between each vmalloced area for the same reason.
 424  */
 425
 426  /* Leave room for gateway page expansion */
 427 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
 428 #error KERNEL_MAP_START is in gateway reserved region
 429 #endif
 430 #define MAP_START (KERNEL_MAP_START)
 431
 432 #define VM_MAP_OFFSET  (32*1024)
 433 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 434                                      & ~(VM_MAP_OFFSET-1)))
 435
 436 void *vmalloc_start;
 437 EXPORT_SYMBOL(vmalloc_start);
 438
 439 #ifdef CONFIG_PA11
 440 unsigned long pcxl_dma_start;
 441 #endif
 442
 443 void __init mem_init(void)
 444 {
 445         high_memory = __va((max_pfn << PAGE_SHIFT));
 446
 447 #ifndef CONFIG_DISCONTIGMEM
 448         max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
 449         mem_map = zone_table[ZONE_DMA]->zone_mem_map;
 450         totalram_pages += free_all_bootmem();
 451 #else
 452         {
 453                 int i;
 454
 455                 for (i = 0; i < npmem_ranges; i++)
 456                         totalram_pages += free_all_bootmem_node(NODE_DATA(i));
 457         }
 458 #endif
 459
 460         printk(KERN_INFO "Memory: %luk available\n", num_physpages << (PAGE_SHIFT-10));
 461
 462 #ifdef CONFIG_PA11
 463         if (hppa_dma_ops == &pcxl_dma_ops) {
 464                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
 465                 vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE);
 466         } else {
 467                 pcxl_dma_start = 0;
 468                 vmalloc_start = SET_MAP_OFFSET(MAP_START);
 469         }
 470 #else
 471         vmalloc_start = SET_MAP_OFFSET(MAP_START);
 472 #endif
 473
 474 }
 475
 476 int do_check_pgt_cache(int low, int high)
 477 {
 478         return 0;
 479 }
 480
 481 unsigned long *empty_zero_page;
 482
 483 void show_mem(void)
 484 {
 485         int i,free = 0,total = 0,reserved = 0;
 486         int shared = 0, cached = 0;
 487
 488         printk(KERN_INFO "Mem-info:\n");
 489         show_free_areas();
 490         printk(KERN_INFO "Free swap:     %6ldkB\n",
 491                                 nr_swap_pages<<(PAGE_SHIFT-10));
 492 #ifndef CONFIG_DISCONTIGMEM
 493         i = max_mapnr;
 494         while (i-- > 0) {
 495                 total++;
 496                 if (PageReserved(mem_map+i))
 497                         reserved++;
 498                 else if (PageSwapCache(mem_map+i))
 499                         cached++;
 500                 else if (!page_count(&mem_map[i]))
 501                         free++;
 502                 else
 503                         shared += page_count(&mem_map[i]) - 1;
 504         }
 505 #else
 506         for (i = 0; i < npmem_ranges; i++) {
 507                 int j;
 508
 509                 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
 510                         struct page *p;
 511
 512                         p = node_mem_map(i) + j - node_start_pfn(i);
 513
 514                         total++;
 515                         if (PageReserved(p))
 516                                 reserved++;
 517                         else if (PageSwapCache(p))
 518                                 cached++;
 519                         else if (!page_count(p))
 520                                 free++;
 521                         else
 522                                 shared += page_count(p) - 1;
 523                 }
 524         }
 525 #endif
 526         printk(KERN_INFO "%d pages of RAM\n", total);
 527         printk(KERN_INFO "%d reserved pages\n", reserved);
 528         printk(KERN_INFO "%d pages shared\n", shared);
 529         printk(KERN_INFO "%d pages swap cached\n", cached);
 530
 531
 532 #ifdef CONFIG_DISCONTIGMEM
 533         {
 534                 struct zonelist *zl;
 535                 int i, j, k;
 536
 537                 for (i = 0; i < npmem_ranges; i++) {
 538                         for (j = 0; j < MAX_NR_ZONES; j++) {
 539                                 zl = NODE_DATA(i)->node_zonelists + j;
 540
 541                                 printk("Zone list for zone %d on node %d: ", j, i);
 542                                 for (k = 0; zl->zones[k] != NULL; k++)
 543                                         printk("[%d/%s] ", zl->zones[k]->zone_pgdat->node_id, zl->zones[k]->name);
 544                                 printk("\n");
 545                         }
 546                 }
 547         }
 548 #endif
 549 }
 550
 551
 552 static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot)
 553 {
 554         pgd_t *pg_dir;
 555         pmd_t *pmd;
 556         pte_t *pg_table;
 557         unsigned long end_paddr;
 558         unsigned long start_pmd;
 559         unsigned long start_pte;
 560         unsigned long tmp1;
 561         unsigned long tmp2;
 562         unsigned long address;
 563         unsigned long ro_start;
 564         unsigned long ro_end;
 565         unsigned long fv_addr;
 566         unsigned long gw_addr;
 567         extern const unsigned long fault_vector_20;
 568         extern void * const linux_gateway_page;
 569
 570         ro_start = __pa((unsigned long)&_text);
 571         ro_end   = __pa((unsigned long)&data_start);
 572         fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
 573         gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
 574
 575         end_paddr = start_paddr + size;
 576
 577         pg_dir = pgd_offset_k(start_vaddr);
 578
 579 #if PTRS_PER_PMD == 1
 580         start_pmd = 0;
 581 #else
 582         start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 583 #endif
 584         start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 585
 586         address = start_paddr;
 587         while (address < end_paddr) {
 588 #if PTRS_PER_PMD == 1
 589                 pmd = (pmd_t *)__pa(pg_dir);
 590 #else
 591                 pmd = (pmd_t *)pgd_address(*pg_dir);
 592
 593                 /*
 594                  * pmd is physical at this point
 595                  */
 596
 597                 if (!pmd) {
 598                         pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER);
 599                         pmd = (pmd_t *) __pa(pmd);
 600                 }
 601
 602                 pgd_populate(NULL, pg_dir, __va(pmd));
 603 #endif
 604                 pg_dir++;
 605
 606                 /* now change pmd to kernel virtual addresses */
 607
 608                 pmd = (pmd_t *)__va(pmd) + start_pmd;
 609                 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) {
 610
 611                         /*
 612                          * pg_table is physical at this point
 613                          */
 614
 615                         pg_table = (pte_t *)pmd_address(*pmd);
 616                         if (!pg_table) {
 617                                 pg_table = (pte_t *)
 618                                         alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE);
 619                                 pg_table = (pte_t *) __pa(pg_table);
 620                         }
 621
 622                         pmd_populate_kernel(NULL, pmd, __va(pg_table));
 623
 624                         /* now change pg_table to kernel virtual addresses */
 625
 626                         pg_table = (pte_t *) __va(pg_table) + start_pte;
 627                         for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) {
 628                                 pte_t pte;
 629
 630                                 /*
 631                                  * Map the fault vector writable so we can
 632                                  * write the HPMC checksum.
 633                                  */
 634                                 if (address >= ro_start && address < ro_end
 635                                                         && address != fv_addr
 636                                                         && address != gw_addr)
 637                                     pte = __mk_pte(address, PAGE_KERNEL_RO);
 638                                 else
 639                                     pte = __mk_pte(address, pgprot);
 640
 641                                 if (address >= end_paddr)
 642                                         pte_val(pte) = 0;
 643
 644                                 set_pte(pg_table, pte);
 645
 646                                 address += PAGE_SIZE;
 647                         }
 648                         start_pte = 0;
 649
 650                         if (address >= end_paddr)
 651                             break;
 652                 }
 653                 start_pmd = 0;
 654         }
 655 }
 656
 657 /*
 658  * pagetable_init() sets up the page tables
 659  *
 660  * Note that gateway_init() places the Linux gateway page at page 0.
 661  * Since gateway pages cannot be dereferenced this has the desirable
 662  * side effect of trapping those pesky NULL-reference errors in the
 663  * kernel.
 664  */
 665 static void __init pagetable_init(void)
 666 {
 667         int range;
 668
 669         /* Map each physical memory range to its kernel vaddr */
 670
 671         for (range = 0; range < npmem_ranges; range++) {
 672                 unsigned long start_paddr;
 673                 unsigned long end_paddr;
 674                 unsigned long size;
 675
 676                 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
 677                 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
 678                 size = pmem_ranges[range].pages << PAGE_SHIFT;
 679
 680                 map_pages((unsigned long)__va(start_paddr), start_paddr,
 681                         size, PAGE_KERNEL);
 682         }
 683
 684 #ifdef CONFIG_BLK_DEV_INITRD
 685         if (initrd_end && initrd_end > mem_limit) {
 686                 printk("initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
 687                 map_pages(initrd_start, __pa(initrd_start),
 688                         initrd_end - initrd_start, PAGE_KERNEL);
 689         }
 690 #endif
 691
 692         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
 693         memset(empty_zero_page, 0, PAGE_SIZE);
 694 }
 695
 696 static void __init gateway_init(void)
 697 {
 698         unsigned long linux_gateway_page_addr;
 699         /* FIXME: This is 'const' in order to trick the compiler
 700            into not treating it as DP-relative data. */
 701         extern void * const linux_gateway_page;
 702
 703         linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
 704
 705         /*
 706          * Setup Linux Gateway page.
 707          *
 708          * The Linux gateway page will reside in kernel space (on virtual
 709          * page 0), so it doesn't need to be aliased into user space.
 710          */
 711
 712         map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
 713                 PAGE_SIZE, PAGE_GATEWAY);
 714 }
 715
 716 #ifdef CONFIG_HPUX
 717 void
 718 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
 719 {
 720         pgd_t *pg_dir;
 721         pmd_t *pmd;
 722         pte_t *pg_table;
 723         unsigned long start_pmd;
 724         unsigned long start_pte;
 725         unsigned long address;
 726         unsigned long hpux_gw_page_addr;
 727         /* FIXME: This is 'const' in order to trick the compiler
 728            into not treating it as DP-relative data. */
 729         extern void * const hpux_gateway_page;
 730
 731         hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
 732
 733         /*
 734          * Setup HP-UX Gateway page.
 735          *
 736          * The HP-UX gateway page resides in the user address space,
 737          * so it needs to be aliased into each process.
 738          */
 739
 740         pg_dir = pgd_offset(mm,hpux_gw_page_addr);
 741
 742 #if PTRS_PER_PMD == 1
 743         start_pmd = 0;
 744 #else
 745         start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 746 #endif
 747         start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 748
 749         address = __pa(&hpux_gateway_page);
 750 #if PTRS_PER_PMD == 1
 751         pmd = (pmd_t *)__pa(pg_dir);
 752 #else
 753         pmd = (pmd_t *) (PAGE_MASK & pgd_val(*pg_dir));
 754
 755         /*
 756          * pmd is physical at this point
 757          */
 758
 759         if (!pmd) {
 760                 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
 761                 pmd = (pmd_t *) __pa(pmd);
 762         }
 763
 764         pgd_val(*pg_dir) = _PAGE_TABLE | (unsigned long) pmd;
 765 #endif
 766         /* now change pmd to kernel virtual addresses */
 767
 768         pmd = (pmd_t *)__va(pmd) + start_pmd;
 769
 770         /*
 771          * pg_table is physical at this point
 772          */
 773
 774         pg_table = (pte_t *) (PAGE_MASK & pmd_val(*pmd));
 775         if (!pg_table)
 776                 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
 777
 778         pmd_val(*pmd) = _PAGE_TABLE | (unsigned long) pg_table;
 779
 780         /* now change pg_table to kernel virtual addresses */
 781
 782         pg_table = (pte_t *) __va(pg_table) + start_pte;
 783         set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
 784 }
 785 EXPORT_SYMBOL(map_hpux_gateway_page);
 786 #endif
 787
 788 extern void flush_tlb_all_local(void);
 789
 790 void __init paging_init(void)
 791 {
 792         int i;
 793
 794         setup_bootmem();
 795         pagetable_init();
 796         gateway_init();
 797         flush_cache_all_local(); /* start with known state */
 798         flush_tlb_all_local();
 799
 800         for (i = 0; i < npmem_ranges; i++) {
 801                 unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0 };
 802
 803                 /* We have an IOMMU, so all memory can go into a single
 804                    ZONE_DMA zone. */
 805                 zones_size[ZONE_DMA] = pmem_ranges[i].pages;
 806
 807                 free_area_init_node(i,NODE_DATA(i),NULL,zones_size,
 808                                 pmem_ranges[i].start_pfn, 0);
 809
 810 #ifdef CONFIG_DISCONTIGMEM
 811                 {
 812                     int j;
 813                     for (j = (node_start_pfn(i) >> PFNNID_SHIFT);
 814                          j <= (node_end_pfn(i) >> PFNNID_SHIFT);
 815                          j++) {
 816                         pfnnid_map[j] = i;
 817                     }
 818                 }
 819 #endif
 820         }
 821 }
 822
 823 #ifdef CONFIG_PA20
 824
 825 /*
 826  * Currently, all PA20 chips have 18 bit protection id's, which is the
 827  * limiting factor (space ids are 32 bits).
 828  */
 829
 830 #define NR_SPACE_IDS 262144
 831
 832 #else
 833
 834 /*
 835  * Currently we have a one-to-one relationship between space id's and
 836  * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
 837  * support 15 bit protection id's, so that is the limiting factor.
 838  * PCXT' has 18 bit protection id's, but only 16 bit spaceids, so it's
 839  * probably not worth the effort for a special case here.
 840  */
 841
 842 #define NR_SPACE_IDS 32768
 843
 844 #endif  /* !CONFIG_PA20 */
 845
 846 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
 847 #define SID_ARRAY_SIZE  (NR_SPACE_IDS / (8 * sizeof(long)))
 848
 849 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
 850 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
 851 static unsigned long space_id_index;
 852 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
 853 static unsigned long dirty_space_ids = 0;
 854
 855 static spinlock_t sid_lock = SPIN_LOCK_UNLOCKED;
 856
 857 unsigned long alloc_sid(void)
 858 {
 859         unsigned long index;
 860
 861         spin_lock(&sid_lock);
 862
 863         if (free_space_ids == 0) {
 864                 if (dirty_space_ids != 0) {
 865                         spin_unlock(&sid_lock);
 866                         flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
 867                         spin_lock(&sid_lock);
 868                 }
 869                 if (free_space_ids == 0)
 870                         BUG();
 871         }
 872
 873         free_space_ids--;
 874
 875         index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
 876         space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
 877         space_id_index = index;
 878
 879         spin_unlock(&sid_lock);
 880
 881         return index << SPACEID_SHIFT;
 882 }
 883
 884 void free_sid(unsigned long spaceid)
 885 {
 886         unsigned long index = spaceid >> SPACEID_SHIFT;
 887         unsigned long *dirty_space_offset;
 888
 889         dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
 890         index &= (BITS_PER_LONG - 1);
 891
 892         spin_lock(&sid_lock);
 893
 894         if (*dirty_space_offset & (1L << index))
 895             BUG(); /* attempt to free space id twice */
 896
 897         *dirty_space_offset |= (1L << index);
 898         dirty_space_ids++;
 899
 900         spin_unlock(&sid_lock);
 901 }
 902
 903
 904 #ifdef CONFIG_SMP
 905 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
 906 {
 907         int i;
 908
 909         /* NOTE: sid_lock must be held upon entry */
 910
 911         *ndirtyptr = dirty_space_ids;
 912         if (dirty_space_ids != 0) {
 913             for (i = 0; i < SID_ARRAY_SIZE; i++) {
 914                 dirty_array[i] = dirty_space_id[i];
 915                 dirty_space_id[i] = 0;
 916             }
 917             dirty_space_ids = 0;
 918         }
 919
 920         return;
 921 }
 922
 923 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
 924 {
 925         int i;
 926
 927         /* NOTE: sid_lock must be held upon entry */
 928
 929         if (ndirty != 0) {
 930                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 931                         space_id[i] ^= dirty_array[i];
 932                 }
 933
 934                 free_space_ids += ndirty;
 935                 space_id_index = 0;
 936         }
 937 }
 938
 939 #else /* CONFIG_SMP */
 940
 941 static void recycle_sids(void)
 942 {
 943         int i;
 944
 945         /* NOTE: sid_lock must be held upon entry */
 946
 947         if (dirty_space_ids != 0) {
 948                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 949                         space_id[i] ^= dirty_space_id[i];
 950                         dirty_space_id[i] = 0;
 951                 }
 952
 953                 free_space_ids += dirty_space_ids;
 954                 dirty_space_ids = 0;
 955                 space_id_index = 0;
 956         }
 957 }
 958 #endif
 959
 960 /*
 961  * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
 962  * purged, we can safely reuse the space ids that were released but
 963  * not flushed from the tlb.
 964  */
 965
 966 #ifdef CONFIG_SMP
 967
 968 static unsigned long recycle_ndirty;
 969 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
 970 static unsigned int recycle_inuse = 0;
 971
 972 void flush_tlb_all(void)
 973 {
 974         int do_recycle;
 975
 976         do_recycle = 0;
 977         spin_lock(&sid_lock);
 978         if (dirty_space_ids > RECYCLE_THRESHOLD) {
 979             if (recycle_inuse) {
 980                 BUG();  /* FIXME: Use a semaphore/wait queue here */
 981             }
 982             get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
 983             recycle_inuse++;
 984             do_recycle++;
 985         }
 986         spin_unlock(&sid_lock);
 987         on_each_cpu((void (*)(void *))flush_tlb_all_local, NULL, 1, 1);
 988         if (do_recycle) {
 989             spin_lock(&sid_lock);
 990             recycle_sids(recycle_ndirty,recycle_dirty_array);
 991             recycle_inuse = 0;
 992             spin_unlock(&sid_lock);
 993         }
 994 }
 995 #else
 996 void flush_tlb_all(void)
 997 {
 998         spin_lock(&sid_lock);
 999         flush_tlb_all_local();
1000         recycle_sids();
1001         spin_unlock(&sid_lock);
1002 }
1003 #endif
1004
1005 #ifdef CONFIG_BLK_DEV_INITRD
1006 void free_initrd_mem(unsigned long start, unsigned long end)
1007 {
1008 #if 0
1009         if (start < end)
1010                 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1011         for (; start < end; start += PAGE_SIZE) {
1012                 ClearPageReserved(virt_to_page(start));
1013                 set_page_count(virt_to_page(start), 1);
1014                 free_page(start);
1015                 num_physpages++;
1016                 totalram_pages++;
1017         }
1018 #endif
1019 }
1020 #endif