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  * Just an arbitrary offset to serve as a "hole" between mapping areas
 422  * (between top of physical memory and a potential pcxl dma mapping
 423  * area, and below the vmalloc mapping area).
 424  *
 425  * The current 32K value just means that there will be a 32K "hole"
 426  * between mapping areas. That means that  any out-of-bounds memory
 427  * accesses will hopefully be caught. The vmalloc() routines leaves
 428  * a hole of 4kB between each vmalloced area for the same reason.
 429  */
 430
 431  /* Leave room for gateway page expansion */
 432 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
 433 #error KERNEL_MAP_START is in gateway reserved region
 434 #endif
 435 #define MAP_START (KERNEL_MAP_START)
 436
 437 #define VM_MAP_OFFSET  (32*1024)
 438 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 439                                      & ~(VM_MAP_OFFSET-1)))
 440
 441 void *vmalloc_start __read_mostly;
 442 EXPORT_SYMBOL(vmalloc_start);
 443
 444 #ifdef CONFIG_PA11
 445 unsigned long pcxl_dma_start __read_mostly;
 446 #endif
 447
 448 void __init mem_init(void)
 449 {
 450         high_memory = __va((max_pfn << PAGE_SHIFT));
 451
 452 #ifndef CONFIG_DISCONTIGMEM
 453         max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
 454         totalram_pages += free_all_bootmem();
 455 #else
 456         {
 457                 int i;
 458
 459                 for (i = 0; i < npmem_ranges; i++)
 460                         totalram_pages += free_all_bootmem_node(NODE_DATA(i));
 461         }
 462 #endif
 463
 464         printk(KERN_INFO "Memory: %luk available\n", num_physpages << (PAGE_SHIFT-10));
 465
 466 #ifdef CONFIG_PA11
 467         if (hppa_dma_ops == &pcxl_dma_ops) {
 468                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
 469                 vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE);
 470         } else {
 471                 pcxl_dma_start = 0;
 472                 vmalloc_start = SET_MAP_OFFSET(MAP_START);
 473         }
 474 #else
 475         vmalloc_start = SET_MAP_OFFSET(MAP_START);
 476 #endif
 477
 478 }
 479
 480 int do_check_pgt_cache(int low, int high)
 481 {
 482         return 0;
 483 }
 484
 485 unsigned long *empty_zero_page __read_mostly;
 486
 487 void show_mem(void)
 488 {
 489         int i,free = 0,total = 0,reserved = 0;
 490         int shared = 0, cached = 0;
 491
 492         printk(KERN_INFO "Mem-info:\n");
 493         show_free_areas();
 494         printk(KERN_INFO "Free swap:     %6ldkB\n",
 495                                 nr_swap_pages<<(PAGE_SHIFT-10));
 496 #ifndef CONFIG_DISCONTIGMEM
 497         i = max_mapnr;
 498         while (i-- > 0) {
 499                 total++;
 500                 if (PageReserved(mem_map+i))
 501                         reserved++;
 502                 else if (PageSwapCache(mem_map+i))
 503                         cached++;
 504                 else if (!page_count(&mem_map[i]))
 505                         free++;
 506                 else
 507                         shared += page_count(&mem_map[i]) - 1;
 508         }
 509 #else
 510         for (i = 0; i < npmem_ranges; i++) {
 511                 int j;
 512
 513                 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
 514                         struct page *p;
 515                         unsigned long flags;
 516
 517                         pgdat_resize_lock(NODE_DATA(i), &flags);
 518                         p = nid_page_nr(i, j) - node_start_pfn(i);
 519
 520                         total++;
 521                         if (PageReserved(p))
 522                                 reserved++;
 523                         else if (PageSwapCache(p))
 524                                 cached++;
 525                         else if (!page_count(p))
 526                                 free++;
 527                         else
 528                                 shared += page_count(p) - 1;
 529                         pgdat_resize_unlock(NODE_DATA(i), &flags);
 530                 }
 531         }
 532 #endif
 533         printk(KERN_INFO "%d pages of RAM\n", total);
 534         printk(KERN_INFO "%d reserved pages\n", reserved);
 535         printk(KERN_INFO "%d pages shared\n", shared);
 536         printk(KERN_INFO "%d pages swap cached\n", cached);
 537
 538
 539 #ifdef CONFIG_DISCONTIGMEM
 540         {
 541                 struct zonelist *zl;
 542                 int i, j, k;
 543
 544                 for (i = 0; i < npmem_ranges; i++) {
 545                         for (j = 0; j < MAX_NR_ZONES; j++) {
 546                                 zl = NODE_DATA(i)->node_zonelists + j;
 547
 548                                 printk("Zone list for zone %d on node %d: ", j, i);
 549                                 for (k = 0; zl->zones[k] != NULL; k++)
 550                                         printk("[%d/%s] ", zl->zones[k]->zone_pgdat->node_id, zl->zones[k]->name);
 551                                 printk("\n");
 552                         }
 553                 }
 554         }
 555 #endif
 556 }
 557
 558
 559 static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot)
 560 {
 561         pgd_t *pg_dir;
 562         pmd_t *pmd;
 563         pte_t *pg_table;
 564         unsigned long end_paddr;
 565         unsigned long start_pmd;
 566         unsigned long start_pte;
 567         unsigned long tmp1;
 568         unsigned long tmp2;
 569         unsigned long address;
 570         unsigned long ro_start;
 571         unsigned long ro_end;
 572         unsigned long fv_addr;
 573         unsigned long gw_addr;
 574         extern const unsigned long fault_vector_20;
 575         extern void * const linux_gateway_page;
 576
 577         ro_start = __pa((unsigned long)&_text);
 578         ro_end   = __pa((unsigned long)&data_start);
 579         fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
 580         gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
 581
 582         end_paddr = start_paddr + size;
 583
 584         pg_dir = pgd_offset_k(start_vaddr);
 585
 586 #if PTRS_PER_PMD == 1
 587         start_pmd = 0;
 588 #else
 589         start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 590 #endif
 591         start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 592
 593         address = start_paddr;
 594         while (address < end_paddr) {
 595 #if PTRS_PER_PMD == 1
 596                 pmd = (pmd_t *)__pa(pg_dir);
 597 #else
 598                 pmd = (pmd_t *)pgd_address(*pg_dir);
 599
 600                 /*
 601                  * pmd is physical at this point
 602                  */
 603
 604                 if (!pmd) {
 605                         pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER);
 606                         pmd = (pmd_t *) __pa(pmd);
 607                 }
 608
 609                 pgd_populate(NULL, pg_dir, __va(pmd));
 610 #endif
 611                 pg_dir++;
 612
 613                 /* now change pmd to kernel virtual addresses */
 614
 615                 pmd = (pmd_t *)__va(pmd) + start_pmd;
 616                 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) {
 617
 618                         /*
 619                          * pg_table is physical at this point
 620                          */
 621
 622                         pg_table = (pte_t *)pmd_address(*pmd);
 623                         if (!pg_table) {
 624                                 pg_table = (pte_t *)
 625                                         alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE);
 626                                 pg_table = (pte_t *) __pa(pg_table);
 627                         }
 628
 629                         pmd_populate_kernel(NULL, pmd, __va(pg_table));
 630
 631                         /* now change pg_table to kernel virtual addresses */
 632
 633                         pg_table = (pte_t *) __va(pg_table) + start_pte;
 634                         for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) {
 635                                 pte_t pte;
 636
 637                                 /*
 638                                  * Map the fault vector writable so we can
 639                                  * write the HPMC checksum.
 640                                  */
 641                                 if (address >= ro_start && address < ro_end
 642                                                         && address != fv_addr
 643                                                         && address != gw_addr)
 644                                     pte = __mk_pte(address, PAGE_KERNEL_RO);
 645                                 else
 646                                     pte = __mk_pte(address, pgprot);
 647
 648                                 if (address >= end_paddr)
 649                                         pte_val(pte) = 0;
 650
 651                                 set_pte(pg_table, pte);
 652
 653                                 address += PAGE_SIZE;
 654                         }
 655                         start_pte = 0;
 656
 657                         if (address >= end_paddr)
 658                             break;
 659                 }
 660                 start_pmd = 0;
 661         }
 662 }
 663
 664 /*
 665  * pagetable_init() sets up the page tables
 666  *
 667  * Note that gateway_init() places the Linux gateway page at page 0.
 668  * Since gateway pages cannot be dereferenced this has the desirable
 669  * side effect of trapping those pesky NULL-reference errors in the
 670  * kernel.
 671  */
 672 static void __init pagetable_init(void)
 673 {
 674         int range;
 675
 676         /* Map each physical memory range to its kernel vaddr */
 677
 678         for (range = 0; range < npmem_ranges; range++) {
 679                 unsigned long start_paddr;
 680                 unsigned long end_paddr;
 681                 unsigned long size;
 682
 683                 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
 684                 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
 685                 size = pmem_ranges[range].pages << PAGE_SHIFT;
 686
 687                 map_pages((unsigned long)__va(start_paddr), start_paddr,
 688                         size, PAGE_KERNEL);
 689         }
 690
 691 #ifdef CONFIG_BLK_DEV_INITRD
 692         if (initrd_end && initrd_end > mem_limit) {
 693                 printk("initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
 694                 map_pages(initrd_start, __pa(initrd_start),
 695                         initrd_end - initrd_start, PAGE_KERNEL);
 696         }
 697 #endif
 698
 699         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
 700         memset(empty_zero_page, 0, PAGE_SIZE);
 701 }
 702
 703 static void __init gateway_init(void)
 704 {
 705         unsigned long linux_gateway_page_addr;
 706         /* FIXME: This is 'const' in order to trick the compiler
 707            into not treating it as DP-relative data. */
 708         extern void * const linux_gateway_page;
 709
 710         linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
 711
 712         /*
 713          * Setup Linux Gateway page.
 714          *
 715          * The Linux gateway page will reside in kernel space (on virtual
 716          * page 0), so it doesn't need to be aliased into user space.
 717          */
 718
 719         map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
 720                 PAGE_SIZE, PAGE_GATEWAY);
 721 }
 722
 723 #ifdef CONFIG_HPUX
 724 void
 725 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
 726 {
 727         pgd_t *pg_dir;
 728         pmd_t *pmd;
 729         pte_t *pg_table;
 730         unsigned long start_pmd;
 731         unsigned long start_pte;
 732         unsigned long address;
 733         unsigned long hpux_gw_page_addr;
 734         /* FIXME: This is 'const' in order to trick the compiler
 735            into not treating it as DP-relative data. */
 736         extern void * const hpux_gateway_page;
 737
 738         hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
 739
 740         /*
 741          * Setup HP-UX Gateway page.
 742          *
 743          * The HP-UX gateway page resides in the user address space,
 744          * so it needs to be aliased into each process.
 745          */
 746
 747         pg_dir = pgd_offset(mm,hpux_gw_page_addr);
 748
 749 #if PTRS_PER_PMD == 1
 750         start_pmd = 0;
 751 #else
 752         start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 753 #endif
 754         start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 755
 756         address = __pa(&hpux_gateway_page);
 757 #if PTRS_PER_PMD == 1
 758         pmd = (pmd_t *)__pa(pg_dir);
 759 #else
 760         pmd = (pmd_t *) pgd_address(*pg_dir);
 761
 762         /*
 763          * pmd is physical at this point
 764          */
 765
 766         if (!pmd) {
 767                 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
 768                 pmd = (pmd_t *) __pa(pmd);
 769         }
 770
 771         __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
 772 #endif
 773         /* now change pmd to kernel virtual addresses */
 774
 775         pmd = (pmd_t *)__va(pmd) + start_pmd;
 776
 777         /*
 778          * pg_table is physical at this point
 779          */
 780
 781         pg_table = (pte_t *) pmd_address(*pmd);
 782         if (!pg_table)
 783                 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
 784
 785         __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
 786
 787         /* now change pg_table to kernel virtual addresses */
 788
 789         pg_table = (pte_t *) __va(pg_table) + start_pte;
 790         set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
 791 }
 792 EXPORT_SYMBOL(map_hpux_gateway_page);
 793 #endif
 794
 795 extern void flush_tlb_all_local(void);
 796
 797 void __init paging_init(void)
 798 {
 799         int i;
 800
 801         setup_bootmem();
 802         pagetable_init();
 803         gateway_init();
 804         flush_cache_all_local(); /* start with known state */
 805         flush_tlb_all_local();
 806
 807         for (i = 0; i < npmem_ranges; i++) {
 808                 unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0 };
 809
 810                 /* We have an IOMMU, so all memory can go into a single
 811                    ZONE_DMA zone. */
 812                 zones_size[ZONE_DMA] = pmem_ranges[i].pages;
 813
 814 #ifdef CONFIG_DISCONTIGMEM
 815                 /* Need to initialize the pfnnid_map before we can initialize
 816                    the zone */
 817                 {
 818                     int j;
 819                     for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
 820                          j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
 821                          j++) {
 822                         pfnnid_map[j] = i;
 823                     }
 824                 }
 825 #endif
 826
 827                 free_area_init_node(i, NODE_DATA(i), zones_size,
 828                                 pmem_ranges[i].start_pfn, NULL);
 829         }
 830 }
 831
 832 #ifdef CONFIG_PA20
 833
 834 /*
 835  * Currently, all PA20 chips have 18 bit protection id's, which is the
 836  * limiting factor (space ids are 32 bits).
 837  */
 838
 839 #define NR_SPACE_IDS 262144
 840
 841 #else
 842
 843 /*
 844  * Currently we have a one-to-one relationship between space id's and
 845  * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
 846  * support 15 bit protection id's, so that is the limiting factor.
 847  * PCXT' has 18 bit protection id's, but only 16 bit spaceids, so it's
 848  * probably not worth the effort for a special case here.
 849  */
 850
 851 #define NR_SPACE_IDS 32768
 852
 853 #endif  /* !CONFIG_PA20 */
 854
 855 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
 856 #define SID_ARRAY_SIZE  (NR_SPACE_IDS / (8 * sizeof(long)))
 857
 858 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
 859 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
 860 static unsigned long space_id_index;
 861 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
 862 static unsigned long dirty_space_ids = 0;
 863
 864 static DEFINE_SPINLOCK(sid_lock);
 865
 866 unsigned long alloc_sid(void)
 867 {
 868         unsigned long index;
 869
 870         spin_lock(&sid_lock);
 871
 872         if (free_space_ids == 0) {
 873                 if (dirty_space_ids != 0) {
 874                         spin_unlock(&sid_lock);
 875                         flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
 876                         spin_lock(&sid_lock);
 877                 }
 878                 if (free_space_ids == 0)
 879                         BUG();
 880         }
 881
 882         free_space_ids--;
 883
 884         index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
 885         space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
 886         space_id_index = index;
 887
 888         spin_unlock(&sid_lock);
 889
 890         return index << SPACEID_SHIFT;
 891 }
 892
 893 void free_sid(unsigned long spaceid)
 894 {
 895         unsigned long index = spaceid >> SPACEID_SHIFT;
 896         unsigned long *dirty_space_offset;
 897
 898         dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
 899         index &= (BITS_PER_LONG - 1);
 900
 901         spin_lock(&sid_lock);
 902
 903         if (*dirty_space_offset & (1L << index))
 904             BUG(); /* attempt to free space id twice */
 905
 906         *dirty_space_offset |= (1L << index);
 907         dirty_space_ids++;
 908
 909         spin_unlock(&sid_lock);
 910 }
 911
 912
 913 #ifdef CONFIG_SMP
 914 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
 915 {
 916         int i;
 917
 918         /* NOTE: sid_lock must be held upon entry */
 919
 920         *ndirtyptr = dirty_space_ids;
 921         if (dirty_space_ids != 0) {
 922             for (i = 0; i < SID_ARRAY_SIZE; i++) {
 923                 dirty_array[i] = dirty_space_id[i];
 924                 dirty_space_id[i] = 0;
 925             }
 926             dirty_space_ids = 0;
 927         }
 928
 929         return;
 930 }
 931
 932 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
 933 {
 934         int i;
 935
 936         /* NOTE: sid_lock must be held upon entry */
 937
 938         if (ndirty != 0) {
 939                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 940                         space_id[i] ^= dirty_array[i];
 941                 }
 942
 943                 free_space_ids += ndirty;
 944                 space_id_index = 0;
 945         }
 946 }
 947
 948 #else /* CONFIG_SMP */
 949
 950 static void recycle_sids(void)
 951 {
 952         int i;
 953
 954         /* NOTE: sid_lock must be held upon entry */
 955
 956         if (dirty_space_ids != 0) {
 957                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 958                         space_id[i] ^= dirty_space_id[i];
 959                         dirty_space_id[i] = 0;
 960                 }
 961
 962                 free_space_ids += dirty_space_ids;
 963                 dirty_space_ids = 0;
 964                 space_id_index = 0;
 965         }
 966 }
 967 #endif
 968
 969 /*
 970  * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
 971  * purged, we can safely reuse the space ids that were released but
 972  * not flushed from the tlb.
 973  */
 974
 975 #ifdef CONFIG_SMP
 976
 977 static unsigned long recycle_ndirty;
 978 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
 979 static unsigned int recycle_inuse = 0;
 980
 981 void flush_tlb_all(void)
 982 {
 983         int do_recycle;
 984
 985         do_recycle = 0;
 986         spin_lock(&sid_lock);
 987         if (dirty_space_ids > RECYCLE_THRESHOLD) {
 988             if (recycle_inuse) {
 989                 BUG();  /* FIXME: Use a semaphore/wait queue here */
 990             }
 991             get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
 992             recycle_inuse++;
 993             do_recycle++;
 994         }
 995         spin_unlock(&sid_lock);
 996         on_each_cpu((void (*)(void *))flush_tlb_all_local, NULL, 1, 1);
 997         if (do_recycle) {
 998             spin_lock(&sid_lock);
 999             recycle_sids(recycle_ndirty,recycle_dirty_array);
1000             recycle_inuse = 0;
1001             spin_unlock(&sid_lock);
1002         }
1003 }
1004 #else
1005 void flush_tlb_all(void)
1006 {
1007         spin_lock(&sid_lock);
1008         flush_tlb_all_local(NULL);
1009         recycle_sids();
1010         spin_unlock(&sid_lock);
1011 }
1012 #endif
1013
1014 #ifdef CONFIG_BLK_DEV_INITRD
1015 void free_initrd_mem(unsigned long start, unsigned long end)
1016 {
1017 #if 0
1018         if (start < end)
1019                 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1020         for (; start < end; start += PAGE_SIZE) {
1021                 ClearPageReserved(virt_to_page(start));
1022                 set_page_count(virt_to_page(start), 1);
1023                 free_page(start);
1024                 num_physpages++;
1025                 totalram_pages++;
1026         }
1027 #endif
1028 }
1029 #endif