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  *  Copyright 2006 Helge Deller (deller@gmx.de)
  10  *
  11  */
  12
  13
  14 #include <linux/module.h>
  15 #include <linux/mm.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/delay.h>
  18 #include <linux/init.h>
  19 #include <linux/pci.h>          /* for hppa_dma_ops and pcxl_dma_ops */
  20 #include <linux/initrd.h>
  21 #include <linux/swap.h>
  22 #include <linux/unistd.h>
  23 #include <linux/nodemask.h>     /* for node_online_map */
  24 #include <linux/pagemap.h>      /* for release_pages and page_cache_release */
  25
  26 #include <asm/pgalloc.h>
  27 #include <asm/tlb.h>
  28 #include <asm/pdc_chassis.h>
  29 #include <asm/mmzone.h>
  30 #include <asm/sections.h>
  31
  32 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  33
  34 extern int  data_start;
  35
  36 #ifdef CONFIG_DISCONTIGMEM
  37 struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
  38 bootmem_data_t bmem_data[MAX_NUMNODES] __read_mostly;
  39 unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
  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] __read_mostly;
  60
  61 /* The following array is initialized from the firmware specific
  62  * information retrieved in kernel/inventory.c.
  63  */
  64
  65 physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
  66 int npmem_ranges __read_mostly;
  67
  68 #ifdef __LP64__
  69 #define MAX_MEM         (~0UL)
  70 #else /* !__LP64__ */
  71 #define MAX_MEM         (3584U*1024U*1024U)
  72 #endif /* !__LP64__ */
  73
  74 static unsigned long mem_limit __read_mostly = MAX_MEM;
  75
  76 static void __init mem_limit_func(void)
  77 {
  78         char *cp, *end;
  79         unsigned long limit;
  80
  81         /* We need this before __setup() functions are called */
  82
  83         limit = MAX_MEM;
  84         for (cp = boot_command_line; *cp; ) {
  85                 if (memcmp(cp, "mem=", 4) == 0) {
  86                         cp += 4;
  87                         limit = memparse(cp, &end);
  88                         if (end != cp)
  89                                 break;
  90                         cp = end;
  91                 } else {
  92                         while (*cp != ' ' && *cp)
  93                                 ++cp;
  94                         while (*cp == ' ')
  95                                 ++cp;
  96                 }
  97         }
  98
  99         if (limit < mem_limit)
 100                 mem_limit = limit;
 101 }
 102
 103 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
 104
 105 static void __init setup_bootmem(void)
 106 {
 107         unsigned long bootmap_size;
 108         unsigned long mem_max;
 109         unsigned long bootmap_pages;
 110         unsigned long bootmap_start_pfn;
 111         unsigned long bootmap_pfn;
 112 #ifndef CONFIG_DISCONTIGMEM
 113         physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
 114         int npmem_holes;
 115 #endif
 116         int i, sysram_resource_count;
 117
 118         disable_sr_hashing(); /* Turn off space register hashing */
 119
 120         /*
 121          * Sort the ranges. Since the number of ranges is typically
 122          * small, and performance is not an issue here, just do
 123          * a simple insertion sort.
 124          */
 125
 126         for (i = 1; i < npmem_ranges; i++) {
 127                 int j;
 128
 129                 for (j = i; j > 0; j--) {
 130                         unsigned long tmp;
 131
 132                         if (pmem_ranges[j-1].start_pfn <
 133                             pmem_ranges[j].start_pfn) {
 134
 135                                 break;
 136                         }
 137                         tmp = pmem_ranges[j-1].start_pfn;
 138                         pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
 139                         pmem_ranges[j].start_pfn = tmp;
 140                         tmp = pmem_ranges[j-1].pages;
 141                         pmem_ranges[j-1].pages = pmem_ranges[j].pages;
 142                         pmem_ranges[j].pages = tmp;
 143                 }
 144         }
 145
 146 #ifndef CONFIG_DISCONTIGMEM
 147         /*
 148          * Throw out ranges that are too far apart (controlled by
 149          * MAX_GAP).
 150          */
 151
 152         for (i = 1; i < npmem_ranges; i++) {
 153                 if (pmem_ranges[i].start_pfn -
 154                         (pmem_ranges[i-1].start_pfn +
 155                          pmem_ranges[i-1].pages) > MAX_GAP) {
 156                         npmem_ranges = i;
 157                         printk("Large gap in memory detected (%ld pages). "
 158                                "Consider turning on CONFIG_DISCONTIGMEM\n",
 159                                pmem_ranges[i].start_pfn -
 160                                (pmem_ranges[i-1].start_pfn +
 161                                 pmem_ranges[i-1].pages));
 162                         break;
 163                 }
 164         }
 165 #endif
 166
 167         if (npmem_ranges > 1) {
 168
 169                 /* Print the memory ranges */
 170
 171                 printk(KERN_INFO "Memory Ranges:\n");
 172
 173                 for (i = 0; i < npmem_ranges; i++) {
 174                         unsigned long start;
 175                         unsigned long size;
 176
 177                         size = (pmem_ranges[i].pages << PAGE_SHIFT);
 178                         start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
 179                         printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
 180                                 i,start, start + (size - 1), size >> 20);
 181                 }
 182         }
 183
 184         sysram_resource_count = npmem_ranges;
 185         for (i = 0; i < sysram_resource_count; i++) {
 186                 struct resource *res = &sysram_resources[i];
 187                 res->name = "System RAM";
 188                 res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT;
 189                 res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1;
 190                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 191                 request_resource(&iomem_resource, res);
 192         }
 193
 194         /*
 195          * For 32 bit kernels we limit the amount of memory we can
 196          * support, in order to preserve enough kernel address space
 197          * for other purposes. For 64 bit kernels we don't normally
 198          * limit the memory, but this mechanism can be used to
 199          * artificially limit the amount of memory (and it is written
 200          * to work with multiple memory ranges).
 201          */
 202
 203         mem_limit_func();       /* check for "mem=" argument */
 204
 205         mem_max = 0;
 206         num_physpages = 0;
 207         for (i = 0; i < npmem_ranges; i++) {
 208                 unsigned long rsize;
 209
 210                 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
 211                 if ((mem_max + rsize) > mem_limit) {
 212                         printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
 213                         if (mem_max == mem_limit)
 214                                 npmem_ranges = i;
 215                         else {
 216                                 pmem_ranges[i].pages =   (mem_limit >> PAGE_SHIFT)
 217                                                        - (mem_max >> PAGE_SHIFT);
 218                                 npmem_ranges = i + 1;
 219                                 mem_max = mem_limit;
 220                         }
 221                 num_physpages += pmem_ranges[i].pages;
 222                         break;
 223                 }
 224             num_physpages += pmem_ranges[i].pages;
 225                 mem_max += rsize;
 226         }
 227
 228         printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
 229
 230 #ifndef CONFIG_DISCONTIGMEM
 231         /* Merge the ranges, keeping track of the holes */
 232
 233         {
 234                 unsigned long end_pfn;
 235                 unsigned long hole_pages;
 236
 237                 npmem_holes = 0;
 238                 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
 239                 for (i = 1; i < npmem_ranges; i++) {
 240
 241                         hole_pages = pmem_ranges[i].start_pfn - end_pfn;
 242                         if (hole_pages) {
 243                                 pmem_holes[npmem_holes].start_pfn = end_pfn;
 244                                 pmem_holes[npmem_holes++].pages = hole_pages;
 245                                 end_pfn += hole_pages;
 246                         }
 247                         end_pfn += pmem_ranges[i].pages;
 248                 }
 249
 250                 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
 251                 npmem_ranges = 1;
 252         }
 253 #endif
 254
 255         bootmap_pages = 0;
 256         for (i = 0; i < npmem_ranges; i++)
 257                 bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages);
 258
 259         bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT;
 260
 261 #ifdef CONFIG_DISCONTIGMEM
 262         for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
 263                 memset(NODE_DATA(i), 0, sizeof(pg_data_t));
 264                 NODE_DATA(i)->bdata = &bmem_data[i];
 265         }
 266         memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
 267
 268         for (i = 0; i < npmem_ranges; i++)
 269                 node_set_online(i);
 270 #endif
 271
 272         /*
 273          * Initialize and free the full range of memory in each range.
 274          * Note that the only writing these routines do are to the bootmap,
 275          * and we've made sure to locate the bootmap properly so that they
 276          * won't be writing over anything important.
 277          */
 278
 279         bootmap_pfn = bootmap_start_pfn;
 280         max_pfn = 0;
 281         for (i = 0; i < npmem_ranges; i++) {
 282                 unsigned long start_pfn;
 283                 unsigned long npages;
 284
 285                 start_pfn = pmem_ranges[i].start_pfn;
 286                 npages = pmem_ranges[i].pages;
 287
 288                 bootmap_size = init_bootmem_node(NODE_DATA(i),
 289                                                 bootmap_pfn,
 290                                                 start_pfn,
 291                                                 (start_pfn + npages) );
 292                 free_bootmem_node(NODE_DATA(i),
 293                                   (start_pfn << PAGE_SHIFT),
 294                                   (npages << PAGE_SHIFT) );
 295                 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 296                 if ((start_pfn + npages) > max_pfn)
 297                         max_pfn = start_pfn + npages;
 298         }
 299
 300         /* IOMMU is always used to access "high mem" on those boxes
 301          * that can support enough mem that a PCI device couldn't
 302          * directly DMA to any physical addresses.
 303          * ISA DMA support will need to revisit this.
 304          */
 305         max_low_pfn = max_pfn;
 306
 307         if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) {
 308                 printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n");
 309                 BUG();
 310         }
 311
 312         /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
 313
 314 #define PDC_CONSOLE_IO_IODC_SIZE 32768
 315
 316         reserve_bootmem_node(NODE_DATA(0), 0UL,
 317                         (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE));
 318         reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text),
 319                         (unsigned long)(_end - _text));
 320         reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
 321                         ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT));
 322
 323 #ifndef CONFIG_DISCONTIGMEM
 324
 325         /* reserve the holes */
 326
 327         for (i = 0; i < npmem_holes; i++) {
 328                 reserve_bootmem_node(NODE_DATA(0),
 329                                 (pmem_holes[i].start_pfn << PAGE_SHIFT),
 330                                 (pmem_holes[i].pages << PAGE_SHIFT));
 331         }
 332 #endif
 333
 334 #ifdef CONFIG_BLK_DEV_INITRD
 335         if (initrd_start) {
 336                 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
 337                 if (__pa(initrd_start) < mem_max) {
 338                         unsigned long initrd_reserve;
 339
 340                         if (__pa(initrd_end) > mem_max) {
 341                                 initrd_reserve = mem_max - __pa(initrd_start);
 342                         } else {
 343                                 initrd_reserve = initrd_end - initrd_start;
 344                         }
 345                         initrd_below_start_ok = 1;
 346                         printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
 347
 348                         reserve_bootmem_node(NODE_DATA(0),__pa(initrd_start), initrd_reserve);
 349                 }
 350         }
 351 #endif
 352
 353         data_resource.start =  virt_to_phys(&data_start);
 354         data_resource.end = virt_to_phys(_end) - 1;
 355         code_resource.start = virt_to_phys(_text);
 356         code_resource.end = virt_to_phys(&data_start)-1;
 357
 358         /* We don't know which region the kernel will be in, so try
 359          * all of them.
 360          */
 361         for (i = 0; i < sysram_resource_count; i++) {
 362                 struct resource *res = &sysram_resources[i];
 363                 request_resource(res, &code_resource);
 364                 request_resource(res, &data_resource);
 365         }
 366         request_resource(&sysram_resources[0], &pdcdata_resource);
 367 }
 368
 369 void free_initmem(void)
 370 {
 371         unsigned long addr, init_begin, init_end;
 372
 373         printk(KERN_INFO "Freeing unused kernel memory: ");
 374
 375 #ifdef CONFIG_DEBUG_KERNEL
 376         /* Attempt to catch anyone trying to execute code here
 377          * by filling the page with BRK insns.
 378          *
 379          * If we disable interrupts for all CPUs, then IPI stops working.
 380          * Kinda breaks the global cache flushing.
 381          */
 382         local_irq_disable();
 383
 384         memset(__init_begin, 0x00,
 385                 (unsigned long)__init_end - (unsigned long)__init_begin);
 386
 387         flush_data_cache();
 388         asm volatile("sync" : : );
 389         flush_icache_range((unsigned long)__init_begin, (unsigned long)__init_end);
 390         asm volatile("sync" : : );
 391
 392         local_irq_enable();
 393 #endif
 394
 395         /* align __init_begin and __init_end to page size,
 396            ignoring linker script where we might have tried to save RAM */
 397         init_begin = PAGE_ALIGN((unsigned long)(__init_begin));
 398         init_end   = PAGE_ALIGN((unsigned long)(__init_end));
 399         for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) {
 400                 ClearPageReserved(virt_to_page(addr));
 401                 init_page_count(virt_to_page(addr));
 402                 free_page(addr);
 403                 num_physpages++;
 404                 totalram_pages++;
 405         }
 406
 407         /* set up a new led state on systems shipped LED State panel */
 408         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
 409
 410         printk("%luk freed\n", (init_end - init_begin) >> 10);
 411 }
 412
 413
 414 #ifdef CONFIG_DEBUG_RODATA
 415 void mark_rodata_ro(void)
 416 {
 417         /* rodata memory was already mapped with KERNEL_RO access rights by
 418            pagetable_init() and map_pages(). No need to do additional stuff here */
 419         printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
 420                 (unsigned long)(__end_rodata - __start_rodata) >> 10);
 421 }
 422 #endif
 423
 424
 425 /*
 426  * Just an arbitrary offset to serve as a "hole" between mapping areas
 427  * (between top of physical memory and a potential pcxl dma mapping
 428  * area, and below the vmalloc mapping area).
 429  *
 430  * The current 32K value just means that there will be a 32K "hole"
 431  * between mapping areas. That means that  any out-of-bounds memory
 432  * accesses will hopefully be caught. The vmalloc() routines leaves
 433  * a hole of 4kB between each vmalloced area for the same reason.
 434  */
 435
 436  /* Leave room for gateway page expansion */
 437 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
 438 #error KERNEL_MAP_START is in gateway reserved region
 439 #endif
 440 #define MAP_START (KERNEL_MAP_START)
 441
 442 #define VM_MAP_OFFSET  (32*1024)
 443 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 444                                      & ~(VM_MAP_OFFSET-1)))
 445
 446 void *vmalloc_start __read_mostly;
 447 EXPORT_SYMBOL(vmalloc_start);
 448
 449 #ifdef CONFIG_PA11
 450 unsigned long pcxl_dma_start __read_mostly;
 451 #endif
 452
 453 void __init mem_init(void)
 454 {
 455         high_memory = __va((max_pfn << PAGE_SHIFT));
 456
 457 #ifndef CONFIG_DISCONTIGMEM
 458         max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
 459         totalram_pages += free_all_bootmem();
 460 #else
 461         {
 462                 int i;
 463
 464                 for (i = 0; i < npmem_ranges; i++)
 465                         totalram_pages += free_all_bootmem_node(NODE_DATA(i));
 466         }
 467 #endif
 468
 469         printk(KERN_INFO "Memory: %luk available\n", num_physpages << (PAGE_SHIFT-10));
 470
 471 #ifdef CONFIG_PA11
 472         if (hppa_dma_ops == &pcxl_dma_ops) {
 473                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
 474                 vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE);
 475         } else {
 476                 pcxl_dma_start = 0;
 477                 vmalloc_start = SET_MAP_OFFSET(MAP_START);
 478         }
 479 #else
 480         vmalloc_start = SET_MAP_OFFSET(MAP_START);
 481 #endif
 482
 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] ", zone_to_nid(zl->zones[k]), 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 defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 642                                 if (address >= ro_start && address < ro_end
 643                                                         && address != fv_addr
 644                                                         && address != gw_addr)
 645                                     pte = __mk_pte(address, PAGE_KERNEL_RO);
 646                                 else
 647 #endif
 648                                     pte = __mk_pte(address, pgprot);
 649
 650                                 if (address >= end_paddr)
 651                                         pte_val(pte) = 0;
 652
 653                                 set_pte(pg_table, pte);
 654
 655                                 address += PAGE_SIZE;
 656                         }
 657                         start_pte = 0;
 658
 659                         if (address >= end_paddr)
 660                             break;
 661                 }
 662                 start_pmd = 0;
 663         }
 664 }
 665
 666 /*
 667  * pagetable_init() sets up the page tables
 668  *
 669  * Note that gateway_init() places the Linux gateway page at page 0.
 670  * Since gateway pages cannot be dereferenced this has the desirable
 671  * side effect of trapping those pesky NULL-reference errors in the
 672  * kernel.
 673  */
 674 static void __init pagetable_init(void)
 675 {
 676         int range;
 677
 678         /* Map each physical memory range to its kernel vaddr */
 679
 680         for (range = 0; range < npmem_ranges; range++) {
 681                 unsigned long start_paddr;
 682                 unsigned long end_paddr;
 683                 unsigned long size;
 684
 685                 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
 686                 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
 687                 size = pmem_ranges[range].pages << PAGE_SHIFT;
 688
 689                 map_pages((unsigned long)__va(start_paddr), start_paddr,
 690                         size, PAGE_KERNEL);
 691         }
 692
 693 #ifdef CONFIG_BLK_DEV_INITRD
 694         if (initrd_end && initrd_end > mem_limit) {
 695                 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
 696                 map_pages(initrd_start, __pa(initrd_start),
 697                         initrd_end - initrd_start, PAGE_KERNEL);
 698         }
 699 #endif
 700
 701         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
 702         memset(empty_zero_page, 0, PAGE_SIZE);
 703 }
 704
 705 static void __init gateway_init(void)
 706 {
 707         unsigned long linux_gateway_page_addr;
 708         /* FIXME: This is 'const' in order to trick the compiler
 709            into not treating it as DP-relative data. */
 710         extern void * const linux_gateway_page;
 711
 712         linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
 713
 714         /*
 715          * Setup Linux Gateway page.
 716          *
 717          * The Linux gateway page will reside in kernel space (on virtual
 718          * page 0), so it doesn't need to be aliased into user space.
 719          */
 720
 721         map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
 722                 PAGE_SIZE, PAGE_GATEWAY);
 723 }
 724
 725 #ifdef CONFIG_HPUX
 726 void
 727 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
 728 {
 729         pgd_t *pg_dir;
 730         pmd_t *pmd;
 731         pte_t *pg_table;
 732         unsigned long start_pmd;
 733         unsigned long start_pte;
 734         unsigned long address;
 735         unsigned long hpux_gw_page_addr;
 736         /* FIXME: This is 'const' in order to trick the compiler
 737            into not treating it as DP-relative data. */
 738         extern void * const hpux_gateway_page;
 739
 740         hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
 741
 742         /*
 743          * Setup HP-UX Gateway page.
 744          *
 745          * The HP-UX gateway page resides in the user address space,
 746          * so it needs to be aliased into each process.
 747          */
 748
 749         pg_dir = pgd_offset(mm,hpux_gw_page_addr);
 750
 751 #if PTRS_PER_PMD == 1
 752         start_pmd = 0;
 753 #else
 754         start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 755 #endif
 756         start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 757
 758         address = __pa(&hpux_gateway_page);
 759 #if PTRS_PER_PMD == 1
 760         pmd = (pmd_t *)__pa(pg_dir);
 761 #else
 762         pmd = (pmd_t *) pgd_address(*pg_dir);
 763
 764         /*
 765          * pmd is physical at this point
 766          */
 767
 768         if (!pmd) {
 769                 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
 770                 pmd = (pmd_t *) __pa(pmd);
 771         }
 772
 773         __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
 774 #endif
 775         /* now change pmd to kernel virtual addresses */
 776
 777         pmd = (pmd_t *)__va(pmd) + start_pmd;
 778
 779         /*
 780          * pg_table is physical at this point
 781          */
 782
 783         pg_table = (pte_t *) pmd_address(*pmd);
 784         if (!pg_table)
 785                 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
 786
 787         __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
 788
 789         /* now change pg_table to kernel virtual addresses */
 790
 791         pg_table = (pte_t *) __va(pg_table) + start_pte;
 792         set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
 793 }
 794 EXPORT_SYMBOL(map_hpux_gateway_page);
 795 #endif
 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(NULL);
 806
 807         for (i = 0; i < npmem_ranges; i++) {
 808                 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
 809
 810                 zones_size[ZONE_NORMAL] = pmem_ranges[i].pages;
 811
 812 #ifdef CONFIG_DISCONTIGMEM
 813                 /* Need to initialize the pfnnid_map before we can initialize
 814                    the zone */
 815                 {
 816                     int j;
 817                     for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
 818                          j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
 819                          j++) {
 820                         pfnnid_map[j] = i;
 821                     }
 822                 }
 823 #endif
 824
 825                 free_area_init_node(i, NODE_DATA(i), zones_size,
 826                                 pmem_ranges[i].start_pfn, NULL);
 827         }
 828 }
 829
 830 #ifdef CONFIG_PA20
 831
 832 /*
 833  * Currently, all PA20 chips have 18 bit protection id's, which is the
 834  * limiting factor (space ids are 32 bits).
 835  */
 836
 837 #define NR_SPACE_IDS 262144
 838
 839 #else
 840
 841 /*
 842  * Currently we have a one-to-one relationship between space id's and
 843  * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
 844  * support 15 bit protection id's, so that is the limiting factor.
 845  * PCXT' has 18 bit protection id's, but only 16 bit spaceids, so it's
 846  * probably not worth the effort for a special case here.
 847  */
 848
 849 #define NR_SPACE_IDS 32768
 850
 851 #endif  /* !CONFIG_PA20 */
 852
 853 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
 854 #define SID_ARRAY_SIZE  (NR_SPACE_IDS / (8 * sizeof(long)))
 855
 856 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
 857 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
 858 static unsigned long space_id_index;
 859 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
 860 static unsigned long dirty_space_ids = 0;
 861
 862 static DEFINE_SPINLOCK(sid_lock);
 863
 864 unsigned long alloc_sid(void)
 865 {
 866         unsigned long index;
 867
 868         spin_lock(&sid_lock);
 869
 870         if (free_space_ids == 0) {
 871                 if (dirty_space_ids != 0) {
 872                         spin_unlock(&sid_lock);
 873                         flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
 874                         spin_lock(&sid_lock);
 875                 }
 876                 BUG_ON(free_space_ids == 0);
 877         }
 878
 879         free_space_ids--;
 880
 881         index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
 882         space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
 883         space_id_index = index;
 884
 885         spin_unlock(&sid_lock);
 886
 887         return index << SPACEID_SHIFT;
 888 }
 889
 890 void free_sid(unsigned long spaceid)
 891 {
 892         unsigned long index = spaceid >> SPACEID_SHIFT;
 893         unsigned long *dirty_space_offset;
 894
 895         dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
 896         index &= (BITS_PER_LONG - 1);
 897
 898         spin_lock(&sid_lock);
 899
 900         BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
 901
 902         *dirty_space_offset |= (1L << index);
 903         dirty_space_ids++;
 904
 905         spin_unlock(&sid_lock);
 906 }
 907
 908
 909 #ifdef CONFIG_SMP
 910 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
 911 {
 912         int i;
 913
 914         /* NOTE: sid_lock must be held upon entry */
 915
 916         *ndirtyptr = dirty_space_ids;
 917         if (dirty_space_ids != 0) {
 918             for (i = 0; i < SID_ARRAY_SIZE; i++) {
 919                 dirty_array[i] = dirty_space_id[i];
 920                 dirty_space_id[i] = 0;
 921             }
 922             dirty_space_ids = 0;
 923         }
 924
 925         return;
 926 }
 927
 928 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
 929 {
 930         int i;
 931
 932         /* NOTE: sid_lock must be held upon entry */
 933
 934         if (ndirty != 0) {
 935                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 936                         space_id[i] ^= dirty_array[i];
 937                 }
 938
 939                 free_space_ids += ndirty;
 940                 space_id_index = 0;
 941         }
 942 }
 943
 944 #else /* CONFIG_SMP */
 945
 946 static void recycle_sids(void)
 947 {
 948         int i;
 949
 950         /* NOTE: sid_lock must be held upon entry */
 951
 952         if (dirty_space_ids != 0) {
 953                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 954                         space_id[i] ^= dirty_space_id[i];
 955                         dirty_space_id[i] = 0;
 956                 }
 957
 958                 free_space_ids += dirty_space_ids;
 959                 dirty_space_ids = 0;
 960                 space_id_index = 0;
 961         }
 962 }
 963 #endif
 964
 965 /*
 966  * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
 967  * purged, we can safely reuse the space ids that were released but
 968  * not flushed from the tlb.
 969  */
 970
 971 #ifdef CONFIG_SMP
 972
 973 static unsigned long recycle_ndirty;
 974 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
 975 static unsigned int recycle_inuse;
 976
 977 void flush_tlb_all(void)
 978 {
 979         int do_recycle;
 980
 981         do_recycle = 0;
 982         spin_lock(&sid_lock);
 983         if (dirty_space_ids > RECYCLE_THRESHOLD) {
 984             BUG_ON(recycle_inuse);  /* FIXME: Use a semaphore/wait queue here */
 985             get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
 986             recycle_inuse++;
 987             do_recycle++;
 988         }
 989         spin_unlock(&sid_lock);
 990         on_each_cpu(flush_tlb_all_local, NULL, 1, 1);
 991         if (do_recycle) {
 992             spin_lock(&sid_lock);
 993             recycle_sids(recycle_ndirty,recycle_dirty_array);
 994             recycle_inuse = 0;
 995             spin_unlock(&sid_lock);
 996         }
 997 }
 998 #else
 999 void flush_tlb_all(void)
1000 {
1001         spin_lock(&sid_lock);
1002         flush_tlb_all_local(NULL);
1003         recycle_sids();
1004         spin_unlock(&sid_lock);
1005 }
1006 #endif
1007
1008 #ifdef CONFIG_BLK_DEV_INITRD
1009 void free_initrd_mem(unsigned long start, unsigned long end)
1010 {
1011         if (start >= end)
1012                 return;
1013         printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1014         for (; start < end; start += PAGE_SIZE) {
1015                 ClearPageReserved(virt_to_page(start));
1016                 init_page_count(virt_to_page(start));
1017                 free_page(start);
1018                 num_physpages++;
1019                 totalram_pages++;
1020         }
1021 }
1022 #endif