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];
  40 bootmem_data_t bmem_data[MAX_NUMNODES];
  41 unsigned char pfnnid_map[PFNNID_MAP_MAX];
  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];
  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         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         if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) {
 304                 printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n");
 305                 BUG();
 306         }
 307
 308         /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
 309
 310 #define PDC_CONSOLE_IO_IODC_SIZE 32768
 311
 312         reserve_bootmem_node(NODE_DATA(0), 0UL,
 313                         (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE));
 314         reserve_bootmem_node(NODE_DATA(0),__pa((unsigned long)&_text),
 315                         (unsigned long)(&_end - &_text));
 316         reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
 317                         ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT));
 318
 319 #ifndef CONFIG_DISCONTIGMEM
 320
 321         /* reserve the holes */
 322
 323         for (i = 0; i < npmem_holes; i++) {
 324                 reserve_bootmem_node(NODE_DATA(0),
 325                                 (pmem_holes[i].start_pfn << PAGE_SHIFT),
 326                                 (pmem_holes[i].pages << PAGE_SHIFT));
 327         }
 328 #endif
 329
 330 #ifdef CONFIG_BLK_DEV_INITRD
 331         if (initrd_start) {
 332                 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
 333                 if (__pa(initrd_start) < mem_max) {
 334                         unsigned long initrd_reserve;
 335
 336                         if (__pa(initrd_end) > mem_max) {
 337                                 initrd_reserve = mem_max - __pa(initrd_start);
 338                         } else {
 339                                 initrd_reserve = initrd_end - initrd_start;
 340                         }
 341                         initrd_below_start_ok = 1;
 342                         printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
 343
 344                         reserve_bootmem_node(NODE_DATA(0),__pa(initrd_start), initrd_reserve);
 345                 }
 346         }
 347 #endif
 348
 349         data_resource.start =  virt_to_phys(&data_start);
 350         data_resource.end = virt_to_phys(&_end)-1;
 351         code_resource.start = virt_to_phys(&_text);
 352         code_resource.end = virt_to_phys(&data_start)-1;
 353
 354         /* We don't know which region the kernel will be in, so try
 355          * all of them.
 356          */
 357         for (i = 0; i < sysram_resource_count; i++) {
 358                 struct resource *res = &sysram_resources[i];
 359                 request_resource(res, &code_resource);
 360                 request_resource(res, &data_resource);
 361         }
 362         request_resource(&sysram_resources[0], &pdcdata_resource);
 363 }
 364
 365 void free_initmem(void)
 366 {
 367         /* FIXME: */
 368 #if 0
 369         printk(KERN_INFO "NOT FREEING INITMEM (%dk)\n",
 370                         (&__init_end - &__init_begin) >> 10);
 371         return;
 372 #else
 373         unsigned long addr;
 374
 375         printk(KERN_INFO "Freeing unused kernel memory: ");
 376
 377 #if 1
 378         /* Attempt to catch anyone trying to execute code here
 379          * by filling the page with BRK insns.
 380          *
 381          * If we disable interrupts for all CPUs, then IPI stops working.
 382          * Kinda breaks the global cache flushing.
 383          */
 384         local_irq_disable();
 385
 386         memset(&__init_begin, 0x00,
 387                 (unsigned long)&__init_end - (unsigned long)&__init_begin);
 388
 389         flush_data_cache();
 390         asm volatile("sync" : : );
 391         flush_icache_range((unsigned long)&__init_begin, (unsigned long)&__init_end);
 392         asm volatile("sync" : : );
 393
 394         local_irq_enable();
 395 #endif
 396
 397         addr = (unsigned long)(&__init_begin);
 398         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 399                 ClearPageReserved(virt_to_page(addr));
 400                 set_page_count(virt_to_page(addr), 1);
 401                 free_page(addr);
 402                 num_physpages++;
 403                 totalram_pages++;
 404         }
 405
 406         /* set up a new led state on systems shipped LED State panel */
 407         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
 408
 409         printk("%luk freed\n", (unsigned long)(&__init_end - &__init_begin) >> 10);
 410 #endif
 411 }
 412
 413 /*
 414  * Just an arbitrary offset to serve as a "hole" between mapping areas
 415  * (between top of physical memory and a potential pcxl dma mapping
 416  * area, and below the vmalloc mapping area).
 417  *
 418  * The current 32K value just means that there will be a 32K "hole"
 419  * between mapping areas. That means that  any out-of-bounds memory
 420  * accesses will hopefully be caught. The vmalloc() routines leaves
 421  * a hole of 4kB between each vmalloced area for the same reason.
 422  */
 423
 424  /* Leave room for gateway page expansion */
 425 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
 426 #error KERNEL_MAP_START is in gateway reserved region
 427 #endif
 428 #define MAP_START (KERNEL_MAP_START)
 429
 430 #define VM_MAP_OFFSET  (32*1024)
 431 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 432                                      & ~(VM_MAP_OFFSET-1)))
 433
 434 void *vmalloc_start;
 435 EXPORT_SYMBOL(vmalloc_start);
 436
 437 #ifdef CONFIG_PA11
 438 unsigned long pcxl_dma_start;
 439 #endif
 440
 441 void __init mem_init(void)
 442 {
 443         high_memory = __va((max_pfn << PAGE_SHIFT));
 444
 445 #ifndef CONFIG_DISCONTIGMEM
 446         max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
 447         totalram_pages += free_all_bootmem();
 448 #else
 449         {
 450                 int i;
 451
 452                 for (i = 0; i < npmem_ranges; i++)
 453                         totalram_pages += free_all_bootmem_node(NODE_DATA(i));
 454         }
 455 #endif
 456
 457         printk(KERN_INFO "Memory: %luk available\n", num_physpages << (PAGE_SHIFT-10));
 458
 459 #ifdef CONFIG_PA11
 460         if (hppa_dma_ops == &pcxl_dma_ops) {
 461                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
 462                 vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE);
 463         } else {
 464                 pcxl_dma_start = 0;
 465                 vmalloc_start = SET_MAP_OFFSET(MAP_START);
 466         }
 467 #else
 468         vmalloc_start = SET_MAP_OFFSET(MAP_START);
 469 #endif
 470
 471 }
 472
 473 int do_check_pgt_cache(int low, int high)
 474 {
 475         return 0;
 476 }
 477
 478 unsigned long *empty_zero_page;
 479
 480 void show_mem(void)
 481 {
 482         int i,free = 0,total = 0,reserved = 0;
 483         int shared = 0, cached = 0;
 484
 485         printk(KERN_INFO "Mem-info:\n");
 486         show_free_areas();
 487         printk(KERN_INFO "Free swap:     %6ldkB\n",
 488                                 nr_swap_pages<<(PAGE_SHIFT-10));
 489 #ifndef CONFIG_DISCONTIGMEM
 490         i = max_mapnr;
 491         while (i-- > 0) {
 492                 total++;
 493                 if (PageReserved(mem_map+i))
 494                         reserved++;
 495                 else if (PageSwapCache(mem_map+i))
 496                         cached++;
 497                 else if (!page_count(&mem_map[i]))
 498                         free++;
 499                 else
 500                         shared += page_count(&mem_map[i]) - 1;
 501         }
 502 #else
 503         for (i = 0; i < npmem_ranges; i++) {
 504                 int j;
 505
 506                 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
 507                         struct page *p;
 508
 509                         p = node_mem_map(i) + j - node_start_pfn(i);
 510
 511                         total++;
 512                         if (PageReserved(p))
 513                                 reserved++;
 514                         else if (PageSwapCache(p))
 515                                 cached++;
 516                         else if (!page_count(p))
 517                                 free++;
 518                         else
 519                                 shared += page_count(p) - 1;
 520                 }
 521         }
 522 #endif
 523         printk(KERN_INFO "%d pages of RAM\n", total);
 524         printk(KERN_INFO "%d reserved pages\n", reserved);
 525         printk(KERN_INFO "%d pages shared\n", shared);
 526         printk(KERN_INFO "%d pages swap cached\n", cached);
 527
 528
 529 #ifdef CONFIG_DISCONTIGMEM
 530         {
 531                 struct zonelist *zl;
 532                 int i, j, k;
 533
 534                 for (i = 0; i < npmem_ranges; i++) {
 535                         for (j = 0; j < MAX_NR_ZONES; j++) {
 536                                 zl = NODE_DATA(i)->node_zonelists + j;
 537
 538                                 printk("Zone list for zone %d on node %d: ", j, i);
 539                                 for (k = 0; zl->zones[k] != NULL; k++)
 540                                         printk("[%d/%s] ", zl->zones[k]->zone_pgdat->node_id, zl->zones[k]->name);
 541                                 printk("\n");
 542                         }
 543                 }
 544         }
 545 #endif
 546 }
 547
 548
 549 static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot)
 550 {
 551         pgd_t *pg_dir;
 552         pmd_t *pmd;
 553         pte_t *pg_table;
 554         unsigned long end_paddr;
 555         unsigned long start_pmd;
 556         unsigned long start_pte;
 557         unsigned long tmp1;
 558         unsigned long tmp2;
 559         unsigned long address;
 560         unsigned long ro_start;
 561         unsigned long ro_end;
 562         unsigned long fv_addr;
 563         unsigned long gw_addr;
 564         extern const unsigned long fault_vector_20;
 565         extern void * const linux_gateway_page;
 566
 567         ro_start = __pa((unsigned long)&_text);
 568         ro_end   = __pa((unsigned long)&data_start);
 569         fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
 570         gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
 571
 572         end_paddr = start_paddr + size;
 573
 574         pg_dir = pgd_offset_k(start_vaddr);
 575
 576 #if PTRS_PER_PMD == 1
 577         start_pmd = 0;
 578 #else
 579         start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 580 #endif
 581         start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 582
 583         address = start_paddr;
 584         while (address < end_paddr) {
 585 #if PTRS_PER_PMD == 1
 586                 pmd = (pmd_t *)__pa(pg_dir);
 587 #else
 588                 pmd = (pmd_t *)pgd_address(*pg_dir);
 589
 590                 /*
 591                  * pmd is physical at this point
 592                  */
 593
 594                 if (!pmd) {
 595                         pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER);
 596                         pmd = (pmd_t *) __pa(pmd);
 597                 }
 598
 599                 pgd_populate(NULL, pg_dir, __va(pmd));
 600 #endif
 601                 pg_dir++;
 602
 603                 /* now change pmd to kernel virtual addresses */
 604
 605                 pmd = (pmd_t *)__va(pmd) + start_pmd;
 606                 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) {
 607
 608                         /*
 609                          * pg_table is physical at this point
 610                          */
 611
 612                         pg_table = (pte_t *)pmd_address(*pmd);
 613                         if (!pg_table) {
 614                                 pg_table = (pte_t *)
 615                                         alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE);
 616                                 pg_table = (pte_t *) __pa(pg_table);
 617                         }
 618
 619                         pmd_populate_kernel(NULL, pmd, __va(pg_table));
 620
 621                         /* now change pg_table to kernel virtual addresses */
 622
 623                         pg_table = (pte_t *) __va(pg_table) + start_pte;
 624                         for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) {
 625                                 pte_t pte;
 626
 627                                 /*
 628                                  * Map the fault vector writable so we can
 629                                  * write the HPMC checksum.
 630                                  */
 631                                 if (address >= ro_start && address < ro_end
 632                                                         && address != fv_addr
 633                                                         && address != gw_addr)
 634                                     pte = __mk_pte(address, PAGE_KERNEL_RO);
 635                                 else
 636                                     pte = __mk_pte(address, pgprot);
 637
 638                                 if (address >= end_paddr)
 639                                         pte_val(pte) = 0;
 640
 641                                 set_pte(pg_table, pte);
 642
 643                                 address += PAGE_SIZE;
 644                         }
 645                         start_pte = 0;
 646
 647                         if (address >= end_paddr)
 648                             break;
 649                 }
 650                 start_pmd = 0;
 651         }
 652 }
 653
 654 /*
 655  * pagetable_init() sets up the page tables
 656  *
 657  * Note that gateway_init() places the Linux gateway page at page 0.
 658  * Since gateway pages cannot be dereferenced this has the desirable
 659  * side effect of trapping those pesky NULL-reference errors in the
 660  * kernel.
 661  */
 662 static void __init pagetable_init(void)
 663 {
 664         int range;
 665
 666         /* Map each physical memory range to its kernel vaddr */
 667
 668         for (range = 0; range < npmem_ranges; range++) {
 669                 unsigned long start_paddr;
 670                 unsigned long end_paddr;
 671                 unsigned long size;
 672
 673                 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
 674                 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
 675                 size = pmem_ranges[range].pages << PAGE_SHIFT;
 676
 677                 map_pages((unsigned long)__va(start_paddr), start_paddr,
 678                         size, PAGE_KERNEL);
 679         }
 680
 681 #ifdef CONFIG_BLK_DEV_INITRD
 682         if (initrd_end && initrd_end > mem_limit) {
 683                 printk("initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
 684                 map_pages(initrd_start, __pa(initrd_start),
 685                         initrd_end - initrd_start, PAGE_KERNEL);
 686         }
 687 #endif
 688
 689         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
 690         memset(empty_zero_page, 0, PAGE_SIZE);
 691 }
 692
 693 static void __init gateway_init(void)
 694 {
 695         unsigned long linux_gateway_page_addr;
 696         /* FIXME: This is 'const' in order to trick the compiler
 697            into not treating it as DP-relative data. */
 698         extern void * const linux_gateway_page;
 699
 700         linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
 701
 702         /*
 703          * Setup Linux Gateway page.
 704          *
 705          * The Linux gateway page will reside in kernel space (on virtual
 706          * page 0), so it doesn't need to be aliased into user space.
 707          */
 708
 709         map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
 710                 PAGE_SIZE, PAGE_GATEWAY);
 711 }
 712
 713 #ifdef CONFIG_HPUX
 714 void
 715 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
 716 {
 717         pgd_t *pg_dir;
 718         pmd_t *pmd;
 719         pte_t *pg_table;
 720         unsigned long start_pmd;
 721         unsigned long start_pte;
 722         unsigned long address;
 723         unsigned long hpux_gw_page_addr;
 724         /* FIXME: This is 'const' in order to trick the compiler
 725            into not treating it as DP-relative data. */
 726         extern void * const hpux_gateway_page;
 727
 728         hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
 729
 730         /*
 731          * Setup HP-UX Gateway page.
 732          *
 733          * The HP-UX gateway page resides in the user address space,
 734          * so it needs to be aliased into each process.
 735          */
 736
 737         pg_dir = pgd_offset(mm,hpux_gw_page_addr);
 738
 739 #if PTRS_PER_PMD == 1
 740         start_pmd = 0;
 741 #else
 742         start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 743 #endif
 744         start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 745
 746         address = __pa(&hpux_gateway_page);
 747 #if PTRS_PER_PMD == 1
 748         pmd = (pmd_t *)__pa(pg_dir);
 749 #else
 750         pmd = (pmd_t *) pgd_address(*pg_dir);
 751
 752         /*
 753          * pmd is physical at this point
 754          */
 755
 756         if (!pmd) {
 757                 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
 758                 pmd = (pmd_t *) __pa(pmd);
 759         }
 760
 761         __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
 762 #endif
 763         /* now change pmd to kernel virtual addresses */
 764
 765         pmd = (pmd_t *)__va(pmd) + start_pmd;
 766
 767         /*
 768          * pg_table is physical at this point
 769          */
 770
 771         pg_table = (pte_t *) pmd_address(*pmd);
 772         if (!pg_table)
 773                 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
 774
 775         __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
 776
 777         /* now change pg_table to kernel virtual addresses */
 778
 779         pg_table = (pte_t *) __va(pg_table) + start_pte;
 780         set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
 781 }
 782 EXPORT_SYMBOL(map_hpux_gateway_page);
 783 #endif
 784
 785 extern void flush_tlb_all_local(void);
 786
 787 void __init paging_init(void)
 788 {
 789         int i;
 790
 791         setup_bootmem();
 792         pagetable_init();
 793         gateway_init();
 794         flush_cache_all_local(); /* start with known state */
 795         flush_tlb_all_local();
 796
 797         for (i = 0; i < npmem_ranges; i++) {
 798                 unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0 };
 799
 800                 /* We have an IOMMU, so all memory can go into a single
 801                    ZONE_DMA zone. */
 802                 zones_size[ZONE_DMA] = pmem_ranges[i].pages;
 803
 804 #ifdef CONFIG_DISCONTIGMEM
 805                 /* Need to initialize the pfnnid_map before we can initialize
 806                    the zone */
 807                 {
 808                     int j;
 809                     for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
 810                          j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
 811                          j++) {
 812                         pfnnid_map[j] = i;
 813                     }
 814                 }
 815 #endif
 816
 817                 free_area_init_node(i, NODE_DATA(i), zones_size,
 818                                 pmem_ranges[i].start_pfn, NULL);
 819         }
 820 }
 821
 822 #ifdef CONFIG_PA20
 823
 824 /*
 825  * Currently, all PA20 chips have 18 bit protection id's, which is the
 826  * limiting factor (space ids are 32 bits).
 827  */
 828
 829 #define NR_SPACE_IDS 262144
 830
 831 #else
 832
 833 /*
 834  * Currently we have a one-to-one relationship between space id's and
 835  * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
 836  * support 15 bit protection id's, so that is the limiting factor.
 837  * PCXT' has 18 bit protection id's, but only 16 bit spaceids, so it's
 838  * probably not worth the effort for a special case here.
 839  */
 840
 841 #define NR_SPACE_IDS 32768
 842
 843 #endif  /* !CONFIG_PA20 */
 844
 845 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
 846 #define SID_ARRAY_SIZE  (NR_SPACE_IDS / (8 * sizeof(long)))
 847
 848 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
 849 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
 850 static unsigned long space_id_index;
 851 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
 852 static unsigned long dirty_space_ids = 0;
 853
 854 static DEFINE_SPINLOCK(sid_lock);
 855
 856 unsigned long alloc_sid(void)
 857 {
 858         unsigned long index;
 859
 860         spin_lock(&sid_lock);
 861
 862         if (free_space_ids == 0) {
 863                 if (dirty_space_ids != 0) {
 864                         spin_unlock(&sid_lock);
 865                         flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
 866                         spin_lock(&sid_lock);
 867                 }
 868                 if (free_space_ids == 0)
 869                         BUG();
 870         }
 871
 872         free_space_ids--;
 873
 874         index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
 875         space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
 876         space_id_index = index;
 877
 878         spin_unlock(&sid_lock);
 879
 880         return index << SPACEID_SHIFT;
 881 }
 882
 883 void free_sid(unsigned long spaceid)
 884 {
 885         unsigned long index = spaceid >> SPACEID_SHIFT;
 886         unsigned long *dirty_space_offset;
 887
 888         dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
 889         index &= (BITS_PER_LONG - 1);
 890
 891         spin_lock(&sid_lock);
 892
 893         if (*dirty_space_offset & (1L << index))
 894             BUG(); /* attempt to free space id twice */
 895
 896         *dirty_space_offset |= (1L << index);
 897         dirty_space_ids++;
 898
 899         spin_unlock(&sid_lock);
 900 }
 901
 902
 903 #ifdef CONFIG_SMP
 904 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
 905 {
 906         int i;
 907
 908         /* NOTE: sid_lock must be held upon entry */
 909
 910         *ndirtyptr = dirty_space_ids;
 911         if (dirty_space_ids != 0) {
 912             for (i = 0; i < SID_ARRAY_SIZE; i++) {
 913                 dirty_array[i] = dirty_space_id[i];
 914                 dirty_space_id[i] = 0;
 915             }
 916             dirty_space_ids = 0;
 917         }
 918
 919         return;
 920 }
 921
 922 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
 923 {
 924         int i;
 925
 926         /* NOTE: sid_lock must be held upon entry */
 927
 928         if (ndirty != 0) {
 929                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 930                         space_id[i] ^= dirty_array[i];
 931                 }
 932
 933                 free_space_ids += ndirty;
 934                 space_id_index = 0;
 935         }
 936 }
 937
 938 #else /* CONFIG_SMP */
 939
 940 static void recycle_sids(void)
 941 {
 942         int i;
 943
 944         /* NOTE: sid_lock must be held upon entry */
 945
 946         if (dirty_space_ids != 0) {
 947                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 948                         space_id[i] ^= dirty_space_id[i];
 949                         dirty_space_id[i] = 0;
 950                 }
 951
 952                 free_space_ids += dirty_space_ids;
 953                 dirty_space_ids = 0;
 954                 space_id_index = 0;
 955         }
 956 }
 957 #endif
 958
 959 /*
 960  * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
 961  * purged, we can safely reuse the space ids that were released but
 962  * not flushed from the tlb.
 963  */
 964
 965 #ifdef CONFIG_SMP
 966
 967 static unsigned long recycle_ndirty;
 968 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
 969 static unsigned int recycle_inuse = 0;
 970
 971 void flush_tlb_all(void)
 972 {
 973         int do_recycle;
 974
 975         do_recycle = 0;
 976         spin_lock(&sid_lock);
 977         if (dirty_space_ids > RECYCLE_THRESHOLD) {
 978             if (recycle_inuse) {
 979                 BUG();  /* FIXME: Use a semaphore/wait queue here */
 980             }
 981             get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
 982             recycle_inuse++;
 983             do_recycle++;
 984         }
 985         spin_unlock(&sid_lock);
 986         on_each_cpu((void (*)(void *))flush_tlb_all_local, NULL, 1, 1);
 987         if (do_recycle) {
 988             spin_lock(&sid_lock);
 989             recycle_sids(recycle_ndirty,recycle_dirty_array);
 990             recycle_inuse = 0;
 991             spin_unlock(&sid_lock);
 992         }
 993 }
 994 #else
 995 void flush_tlb_all(void)
 996 {
 997         spin_lock(&sid_lock);
 998         flush_tlb_all_local();
 999         recycle_sids();
1000         spin_unlock(&sid_lock);
1001 }
1002 #endif
1003
1004 #ifdef CONFIG_BLK_DEV_INITRD
1005 void free_initrd_mem(unsigned long start, unsigned long end)
1006 {
1007 #if 0
1008         if (start < end)
1009                 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1010         for (; start < end; start += PAGE_SIZE) {
1011                 ClearPageReserved(virt_to_page(start));
1012                 set_page_count(virt_to_page(start), 1);
1013                 free_page(start);
1014                 num_physpages++;
1015                 totalram_pages++;
1016         }
1017 #endif
1018 }
1019 #endif