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 2006-2007 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/gfp.h>
  18 #include <linux/delay.h>
  19 #include <linux/init.h>
  20 #include <linux/pci.h>          /* for hppa_dma_ops and pcxl_dma_ops */
  21 #include <linux/initrd.h>
  22 #include <linux/swap.h>
  23 #include <linux/unistd.h>
  24 #include <linux/nodemask.h>     /* for node_online_map */
  25 #include <linux/pagemap.h>      /* for release_pages and page_cache_release */
  26
  27 #include <asm/pgalloc.h>
  28 #include <asm/pgtable.h>
  29 #include <asm/tlb.h>
  30 #include <asm/pdc_chassis.h>
  31 #include <asm/mmzone.h>
  32 #include <asm/sections.h>
  33
  34 extern int  data_start;
  35
  36 #if PT_NLEVELS == 3
  37 /* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout
  38  * with the first pmd adjacent to the pgd and below it. gcc doesn't actually
  39  * guarantee that global objects will be laid out in memory in the same order
  40  * as the order of declaration, so put these in different sections and use
  41  * the linker script to order them. */
  42 pmd_t pmd0[PTRS_PER_PMD] __attribute__ ((__section__ (".data..vm0.pmd"), aligned(PAGE_SIZE)));
  43 #endif
  44
  45 pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((__section__ (".data..vm0.pgd"), aligned(PAGE_SIZE)));
  46 pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __attribute__ ((__section__ (".data..vm0.pte"), aligned(PAGE_SIZE)));
  47
  48 #ifdef CONFIG_DISCONTIGMEM
  49 struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
  50 signed char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
  51 #endif
  52
  53 static struct resource data_resource = {
  54         .name   = "Kernel data",
  55         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  56 };
  57
  58 static struct resource code_resource = {
  59         .name   = "Kernel code",
  60         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  61 };
  62
  63 static struct resource pdcdata_resource = {
  64         .name   = "PDC data (Page Zero)",
  65         .start  = 0,
  66         .end    = 0x9ff,
  67         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  68 };
  69
  70 static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
  71
  72 /* The following array is initialized from the firmware specific
  73  * information retrieved in kernel/inventory.c.
  74  */
  75
  76 physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
  77 int npmem_ranges __read_mostly;
  78
  79 #ifdef CONFIG_64BIT
  80 #define MAX_MEM         (~0UL)
  81 #else /* !CONFIG_64BIT */
  82 #define MAX_MEM         (3584U*1024U*1024U)
  83 #endif /* !CONFIG_64BIT */
  84
  85 static unsigned long mem_limit __read_mostly = MAX_MEM;
  86
  87 static void __init mem_limit_func(void)
  88 {
  89         char *cp, *end;
  90         unsigned long limit;
  91
  92         /* We need this before __setup() functions are called */
  93
  94         limit = MAX_MEM;
  95         for (cp = boot_command_line; *cp; ) {
  96                 if (memcmp(cp, "mem=", 4) == 0) {
  97                         cp += 4;
  98                         limit = memparse(cp, &end);
  99                         if (end != cp)
 100                                 break;
 101                         cp = end;
 102                 } else {
 103                         while (*cp != ' ' && *cp)
 104                                 ++cp;
 105                         while (*cp == ' ')
 106                                 ++cp;
 107                 }
 108         }
 109
 110         if (limit < mem_limit)
 111                 mem_limit = limit;
 112 }
 113
 114 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
 115
 116 static void __init setup_bootmem(void)
 117 {
 118         unsigned long bootmap_size;
 119         unsigned long mem_max;
 120         unsigned long bootmap_pages;
 121         unsigned long bootmap_start_pfn;
 122         unsigned long bootmap_pfn;
 123 #ifndef CONFIG_DISCONTIGMEM
 124         physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
 125         int npmem_holes;
 126 #endif
 127         int i, sysram_resource_count;
 128
 129         disable_sr_hashing(); /* Turn off space register hashing */
 130
 131         /*
 132          * Sort the ranges. Since the number of ranges is typically
 133          * small, and performance is not an issue here, just do
 134          * a simple insertion sort.
 135          */
 136
 137         for (i = 1; i < npmem_ranges; i++) {
 138                 int j;
 139
 140                 for (j = i; j > 0; j--) {
 141                         unsigned long tmp;
 142
 143                         if (pmem_ranges[j-1].start_pfn <
 144                             pmem_ranges[j].start_pfn) {
 145
 146                                 break;
 147                         }
 148                         tmp = pmem_ranges[j-1].start_pfn;
 149                         pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
 150                         pmem_ranges[j].start_pfn = tmp;
 151                         tmp = pmem_ranges[j-1].pages;
 152                         pmem_ranges[j-1].pages = pmem_ranges[j].pages;
 153                         pmem_ranges[j].pages = tmp;
 154                 }
 155         }
 156
 157 #ifndef CONFIG_DISCONTIGMEM
 158         /*
 159          * Throw out ranges that are too far apart (controlled by
 160          * MAX_GAP).
 161          */
 162
 163         for (i = 1; i < npmem_ranges; i++) {
 164                 if (pmem_ranges[i].start_pfn -
 165                         (pmem_ranges[i-1].start_pfn +
 166                          pmem_ranges[i-1].pages) > MAX_GAP) {
 167                         npmem_ranges = i;
 168                         printk("Large gap in memory detected (%ld pages). "
 169                                "Consider turning on CONFIG_DISCONTIGMEM\n",
 170                                pmem_ranges[i].start_pfn -
 171                                (pmem_ranges[i-1].start_pfn +
 172                                 pmem_ranges[i-1].pages));
 173                         break;
 174                 }
 175         }
 176 #endif
 177
 178         if (npmem_ranges > 1) {
 179
 180                 /* Print the memory ranges */
 181
 182                 printk(KERN_INFO "Memory Ranges:\n");
 183
 184                 for (i = 0; i < npmem_ranges; i++) {
 185                         unsigned long start;
 186                         unsigned long size;
 187
 188                         size = (pmem_ranges[i].pages << PAGE_SHIFT);
 189                         start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
 190                         printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
 191                                 i,start, start + (size - 1), size >> 20);
 192                 }
 193         }
 194
 195         sysram_resource_count = npmem_ranges;
 196         for (i = 0; i < sysram_resource_count; i++) {
 197                 struct resource *res = &sysram_resources[i];
 198                 res->name = "System RAM";
 199                 res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT;
 200                 res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1;
 201                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 202                 request_resource(&iomem_resource, res);
 203         }
 204
 205         /*
 206          * For 32 bit kernels we limit the amount of memory we can
 207          * support, in order to preserve enough kernel address space
 208          * for other purposes. For 64 bit kernels we don't normally
 209          * limit the memory, but this mechanism can be used to
 210          * artificially limit the amount of memory (and it is written
 211          * to work with multiple memory ranges).
 212          */
 213
 214         mem_limit_func();       /* check for "mem=" argument */
 215
 216         mem_max = 0;
 217         for (i = 0; i < npmem_ranges; i++) {
 218                 unsigned long rsize;
 219
 220                 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
 221                 if ((mem_max + rsize) > mem_limit) {
 222                         printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
 223                         if (mem_max == mem_limit)
 224                                 npmem_ranges = i;
 225                         else {
 226                                 pmem_ranges[i].pages =   (mem_limit >> PAGE_SHIFT)
 227                                                        - (mem_max >> PAGE_SHIFT);
 228                                 npmem_ranges = i + 1;
 229                                 mem_max = mem_limit;
 230                         }
 231                         break;
 232                 }
 233                 mem_max += rsize;
 234         }
 235
 236         printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
 237
 238 #ifndef CONFIG_DISCONTIGMEM
 239         /* Merge the ranges, keeping track of the holes */
 240
 241         {
 242                 unsigned long end_pfn;
 243                 unsigned long hole_pages;
 244
 245                 npmem_holes = 0;
 246                 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
 247                 for (i = 1; i < npmem_ranges; i++) {
 248
 249                         hole_pages = pmem_ranges[i].start_pfn - end_pfn;
 250                         if (hole_pages) {
 251                                 pmem_holes[npmem_holes].start_pfn = end_pfn;
 252                                 pmem_holes[npmem_holes++].pages = hole_pages;
 253                                 end_pfn += hole_pages;
 254                         }
 255                         end_pfn += pmem_ranges[i].pages;
 256                 }
 257
 258                 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
 259                 npmem_ranges = 1;
 260         }
 261 #endif
 262
 263         bootmap_pages = 0;
 264         for (i = 0; i < npmem_ranges; i++)
 265                 bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages);
 266
 267         bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT;
 268
 269 #ifdef CONFIG_DISCONTIGMEM
 270         for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
 271                 memset(NODE_DATA(i), 0, sizeof(pg_data_t));
 272                 NODE_DATA(i)->bdata = &bootmem_node_data[i];
 273         }
 274         memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
 275
 276         for (i = 0; i < npmem_ranges; i++) {
 277                 node_set_state(i, N_NORMAL_MEMORY);
 278                 node_set_online(i);
 279         }
 280 #endif
 281
 282         /*
 283          * Initialize and free the full range of memory in each range.
 284          * Note that the only writing these routines do are to the bootmap,
 285          * and we've made sure to locate the bootmap properly so that they
 286          * won't be writing over anything important.
 287          */
 288
 289         bootmap_pfn = bootmap_start_pfn;
 290         max_pfn = 0;
 291         for (i = 0; i < npmem_ranges; i++) {
 292                 unsigned long start_pfn;
 293                 unsigned long npages;
 294
 295                 start_pfn = pmem_ranges[i].start_pfn;
 296                 npages = pmem_ranges[i].pages;
 297
 298                 bootmap_size = init_bootmem_node(NODE_DATA(i),
 299                                                 bootmap_pfn,
 300                                                 start_pfn,
 301                                                 (start_pfn + npages) );
 302                 free_bootmem_node(NODE_DATA(i),
 303                                   (start_pfn << PAGE_SHIFT),
 304                                   (npages << PAGE_SHIFT) );
 305                 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 306                 if ((start_pfn + npages) > max_pfn)
 307                         max_pfn = start_pfn + npages;
 308         }
 309
 310         /* IOMMU is always used to access "high mem" on those boxes
 311          * that can support enough mem that a PCI device couldn't
 312          * directly DMA to any physical addresses.
 313          * ISA DMA support will need to revisit this.
 314          */
 315         max_low_pfn = max_pfn;
 316
 317         /* bootmap sizing messed up? */
 318         BUG_ON((bootmap_pfn - bootmap_start_pfn) != bootmap_pages);
 319
 320         /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
 321
 322 #define PDC_CONSOLE_IO_IODC_SIZE 32768
 323
 324         reserve_bootmem_node(NODE_DATA(0), 0UL,
 325                         (unsigned long)(PAGE0->mem_free +
 326                                 PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT);
 327         reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text),
 328                         (unsigned long)(_end - _text), BOOTMEM_DEFAULT);
 329         reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
 330                         ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT),
 331                         BOOTMEM_DEFAULT);
 332
 333 #ifndef CONFIG_DISCONTIGMEM
 334
 335         /* reserve the holes */
 336
 337         for (i = 0; i < npmem_holes; i++) {
 338                 reserve_bootmem_node(NODE_DATA(0),
 339                                 (pmem_holes[i].start_pfn << PAGE_SHIFT),
 340                                 (pmem_holes[i].pages << PAGE_SHIFT),
 341                                 BOOTMEM_DEFAULT);
 342         }
 343 #endif
 344
 345 #ifdef CONFIG_BLK_DEV_INITRD
 346         if (initrd_start) {
 347                 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
 348                 if (__pa(initrd_start) < mem_max) {
 349                         unsigned long initrd_reserve;
 350
 351                         if (__pa(initrd_end) > mem_max) {
 352                                 initrd_reserve = mem_max - __pa(initrd_start);
 353                         } else {
 354                                 initrd_reserve = initrd_end - initrd_start;
 355                         }
 356                         initrd_below_start_ok = 1;
 357                         printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
 358
 359                         reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start),
 360                                         initrd_reserve, BOOTMEM_DEFAULT);
 361                 }
 362         }
 363 #endif
 364
 365         data_resource.start =  virt_to_phys(&data_start);
 366         data_resource.end = virt_to_phys(_end) - 1;
 367         code_resource.start = virt_to_phys(_text);
 368         code_resource.end = virt_to_phys(&data_start)-1;
 369
 370         /* We don't know which region the kernel will be in, so try
 371          * all of them.
 372          */
 373         for (i = 0; i < sysram_resource_count; i++) {
 374                 struct resource *res = &sysram_resources[i];
 375                 request_resource(res, &code_resource);
 376                 request_resource(res, &data_resource);
 377         }
 378         request_resource(&sysram_resources[0], &pdcdata_resource);
 379 }
 380
 381 static void __init map_pages(unsigned long start_vaddr,
 382                              unsigned long start_paddr, unsigned long size,
 383                              pgprot_t pgprot, int force)
 384 {
 385         pgd_t *pg_dir;
 386         pmd_t *pmd;
 387         pte_t *pg_table;
 388         unsigned long end_paddr;
 389         unsigned long start_pmd;
 390         unsigned long start_pte;
 391         unsigned long tmp1;
 392         unsigned long tmp2;
 393         unsigned long address;
 394         unsigned long vaddr;
 395         unsigned long ro_start;
 396         unsigned long ro_end;
 397         unsigned long fv_addr;
 398         unsigned long gw_addr;
 399         extern const unsigned long fault_vector_20;
 400         extern void * const linux_gateway_page;
 401
 402         ro_start = __pa((unsigned long)_text);
 403         ro_end   = __pa((unsigned long)&data_start);
 404         fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
 405         gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
 406
 407         end_paddr = start_paddr + size;
 408
 409         pg_dir = pgd_offset_k(start_vaddr);
 410
 411 #if PTRS_PER_PMD == 1
 412         start_pmd = 0;
 413 #else
 414         start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 415 #endif
 416         start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 417
 418         address = start_paddr;
 419         vaddr = start_vaddr;
 420         while (address < end_paddr) {
 421 #if PTRS_PER_PMD == 1
 422                 pmd = (pmd_t *)__pa(pg_dir);
 423 #else
 424                 pmd = (pmd_t *)pgd_address(*pg_dir);
 425
 426                 /*
 427                  * pmd is physical at this point
 428                  */
 429
 430                 if (!pmd) {
 431                         pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE << PMD_ORDER);
 432                         pmd = (pmd_t *) __pa(pmd);
 433                 }
 434
 435                 pgd_populate(NULL, pg_dir, __va(pmd));
 436 #endif
 437                 pg_dir++;
 438
 439                 /* now change pmd to kernel virtual addresses */
 440
 441                 pmd = (pmd_t *)__va(pmd) + start_pmd;
 442                 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) {
 443
 444                         /*
 445                          * pg_table is physical at this point
 446                          */
 447
 448                         pg_table = (pte_t *)pmd_address(*pmd);
 449                         if (!pg_table) {
 450                                 pg_table = (pte_t *)
 451                                         alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE);
 452                                 pg_table = (pte_t *) __pa(pg_table);
 453                         }
 454
 455                         pmd_populate_kernel(NULL, pmd, __va(pg_table));
 456
 457                         /* now change pg_table to kernel virtual addresses */
 458
 459                         pg_table = (pte_t *) __va(pg_table) + start_pte;
 460                         for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {
 461                                 pte_t pte;
 462
 463                                 /*
 464                                  * Map the fault vector writable so we can
 465                                  * write the HPMC checksum.
 466                                  */
 467                                 if (force)
 468                                         pte =  __mk_pte(address, pgprot);
 469                                 else if (core_kernel_text(vaddr) &&
 470                                          address != fv_addr)
 471                                         pte = __mk_pte(address, PAGE_KERNEL_EXEC);
 472                                 else
 473 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 474                                 if (address >= ro_start && address < ro_end
 475                                                         && address != fv_addr
 476                                                         && address != gw_addr)
 477                                         pte = __mk_pte(address, PAGE_KERNEL_RO);
 478                                 else
 479 #endif
 480                                         pte = __mk_pte(address, pgprot);
 481
 482                                 if (address >= end_paddr) {
 483                                         if (force)
 484                                                 break;
 485                                         else
 486                                                 pte_val(pte) = 0;
 487                                 }
 488
 489                                 set_pte(pg_table, pte);
 490
 491                                 address += PAGE_SIZE;
 492                                 vaddr += PAGE_SIZE;
 493                         }
 494                         start_pte = 0;
 495
 496                         if (address >= end_paddr)
 497                             break;
 498                 }
 499                 start_pmd = 0;
 500         }
 501 }
 502
 503 void free_initmem(void)
 504 {
 505         unsigned long init_begin = (unsigned long)__init_begin;
 506         unsigned long init_end = (unsigned long)__init_end;
 507
 508         /* The init text pages are marked R-X.  We have to
 509          * flush the icache and mark them RW-
 510          *
 511          * This is tricky, because map_pages is in the init section.
 512          * Do a dummy remap of the data section first (the data
 513          * section is already PAGE_KERNEL) to pull in the TLB entries
 514          * for map_kernel */
 515         map_pages(init_begin, __pa(init_begin), init_end - init_begin,
 516                   PAGE_KERNEL_RWX, 1);
 517         /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute
 518          * map_pages */
 519         map_pages(init_begin, __pa(init_begin), init_end - init_begin,
 520                   PAGE_KERNEL, 1);
 521
 522         /* force the kernel to see the new TLB entries */
 523         __flush_tlb_range(0, init_begin, init_end);
 524         /* Attempt to catch anyone trying to execute code here
 525          * by filling the page with BRK insns.
 526          */
 527         memset((void *)init_begin, 0x00, init_end - init_begin);
 528         /* finally dump all the instructions which were cached, since the
 529          * pages are no-longer executable */
 530         flush_icache_range(init_begin, init_end);
 531
 532         free_initmem_default(-1);
 533
 534         /* set up a new led state on systems shipped LED State panel */
 535         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
 536 }
 537
 538
 539 #ifdef CONFIG_DEBUG_RODATA
 540 void mark_rodata_ro(void)
 541 {
 542         /* rodata memory was already mapped with KERNEL_RO access rights by
 543            pagetable_init() and map_pages(). No need to do additional stuff here */
 544         printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
 545                 (unsigned long)(__end_rodata - __start_rodata) >> 10);
 546 }
 547 #endif
 548
 549
 550 /*
 551  * Just an arbitrary offset to serve as a "hole" between mapping areas
 552  * (between top of physical memory and a potential pcxl dma mapping
 553  * area, and below the vmalloc mapping area).
 554  *
 555  * The current 32K value just means that there will be a 32K "hole"
 556  * between mapping areas. That means that  any out-of-bounds memory
 557  * accesses will hopefully be caught. The vmalloc() routines leaves
 558  * a hole of 4kB between each vmalloced area for the same reason.
 559  */
 560
 561  /* Leave room for gateway page expansion */
 562 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
 563 #error KERNEL_MAP_START is in gateway reserved region
 564 #endif
 565 #define MAP_START (KERNEL_MAP_START)
 566
 567 #define VM_MAP_OFFSET  (32*1024)
 568 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
 569                                      & ~(VM_MAP_OFFSET-1)))
 570
 571 void *parisc_vmalloc_start __read_mostly;
 572 EXPORT_SYMBOL(parisc_vmalloc_start);
 573
 574 #ifdef CONFIG_PA11
 575 unsigned long pcxl_dma_start __read_mostly;
 576 #endif
 577
 578 void __init mem_init(void)
 579 {
 580         /* Do sanity checks on page table constants */
 581         BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
 582         BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
 583         BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
 584         BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
 585                         > BITS_PER_LONG);
 586
 587         high_memory = __va((max_pfn << PAGE_SHIFT));
 588         set_max_mapnr(page_to_pfn(virt_to_page(high_memory - 1)) + 1);
 589         free_all_bootmem();
 590
 591 #ifdef CONFIG_PA11
 592         if (hppa_dma_ops == &pcxl_dma_ops) {
 593                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
 594                 parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
 595                                                 + PCXL_DMA_MAP_SIZE);
 596         } else {
 597                 pcxl_dma_start = 0;
 598                 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
 599         }
 600 #else
 601         parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
 602 #endif
 603
 604         mem_init_print_info(NULL);
 605 #ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
 606         printk("virtual kernel memory layout:\n"
 607                "    vmalloc : 0x%p - 0x%p   (%4ld MB)\n"
 608                "    memory  : 0x%p - 0x%p   (%4ld MB)\n"
 609                "      .init : 0x%p - 0x%p   (%4ld kB)\n"
 610                "      .data : 0x%p - 0x%p   (%4ld kB)\n"
 611                "      .text : 0x%p - 0x%p   (%4ld kB)\n",
 612
 613                (void*)VMALLOC_START, (void*)VMALLOC_END,
 614                (VMALLOC_END - VMALLOC_START) >> 20,
 615
 616                __va(0), high_memory,
 617                ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
 618
 619                __init_begin, __init_end,
 620                ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
 621
 622                _etext, _edata,
 623                ((unsigned long)_edata - (unsigned long)_etext) >> 10,
 624
 625                _text, _etext,
 626                ((unsigned long)_etext - (unsigned long)_text) >> 10);
 627 #endif
 628 }
 629
 630 unsigned long *empty_zero_page __read_mostly;
 631 EXPORT_SYMBOL(empty_zero_page);
 632
 633 void show_mem(unsigned int filter)
 634 {
 635         int i,free = 0,total = 0,reserved = 0;
 636         int shared = 0, cached = 0;
 637
 638         printk(KERN_INFO "Mem-info:\n");
 639         show_free_areas(filter);
 640         if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
 641                 return;
 642 #ifndef CONFIG_DISCONTIGMEM
 643         i = max_mapnr;
 644         while (i-- > 0) {
 645                 total++;
 646                 if (PageReserved(mem_map+i))
 647                         reserved++;
 648                 else if (PageSwapCache(mem_map+i))
 649                         cached++;
 650                 else if (!page_count(&mem_map[i]))
 651                         free++;
 652                 else
 653                         shared += page_count(&mem_map[i]) - 1;
 654         }
 655 #else
 656         for (i = 0; i < npmem_ranges; i++) {
 657                 int j;
 658
 659                 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
 660                         struct page *p;
 661                         unsigned long flags;
 662
 663                         pgdat_resize_lock(NODE_DATA(i), &flags);
 664                         p = nid_page_nr(i, j) - node_start_pfn(i);
 665
 666                         total++;
 667                         if (PageReserved(p))
 668                                 reserved++;
 669                         else if (PageSwapCache(p))
 670                                 cached++;
 671                         else if (!page_count(p))
 672                                 free++;
 673                         else
 674                                 shared += page_count(p) - 1;
 675                         pgdat_resize_unlock(NODE_DATA(i), &flags);
 676                 }
 677         }
 678 #endif
 679         printk(KERN_INFO "%d pages of RAM\n", total);
 680         printk(KERN_INFO "%d reserved pages\n", reserved);
 681         printk(KERN_INFO "%d pages shared\n", shared);
 682         printk(KERN_INFO "%d pages swap cached\n", cached);
 683
 684
 685 #ifdef CONFIG_DISCONTIGMEM
 686         {
 687                 struct zonelist *zl;
 688                 int i, j;
 689
 690                 for (i = 0; i < npmem_ranges; i++) {
 691                         zl = node_zonelist(i, 0);
 692                         for (j = 0; j < MAX_NR_ZONES; j++) {
 693                                 struct zoneref *z;
 694                                 struct zone *zone;
 695
 696                                 printk("Zone list for zone %d on node %d: ", j, i);
 697                                 for_each_zone_zonelist(zone, z, zl, j)
 698                                         printk("[%d/%s] ", zone_to_nid(zone),
 699                                                                 zone->name);
 700                                 printk("\n");
 701                         }
 702                 }
 703         }
 704 #endif
 705 }
 706
 707 /*
 708  * pagetable_init() sets up the page tables
 709  *
 710  * Note that gateway_init() places the Linux gateway page at page 0.
 711  * Since gateway pages cannot be dereferenced this has the desirable
 712  * side effect of trapping those pesky NULL-reference errors in the
 713  * kernel.
 714  */
 715 static void __init pagetable_init(void)
 716 {
 717         int range;
 718
 719         /* Map each physical memory range to its kernel vaddr */
 720
 721         for (range = 0; range < npmem_ranges; range++) {
 722                 unsigned long start_paddr;
 723                 unsigned long end_paddr;
 724                 unsigned long size;
 725
 726                 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
 727                 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
 728                 size = pmem_ranges[range].pages << PAGE_SHIFT;
 729
 730                 map_pages((unsigned long)__va(start_paddr), start_paddr,
 731                           size, PAGE_KERNEL, 0);
 732         }
 733
 734 #ifdef CONFIG_BLK_DEV_INITRD
 735         if (initrd_end && initrd_end > mem_limit) {
 736                 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
 737                 map_pages(initrd_start, __pa(initrd_start),
 738                           initrd_end - initrd_start, PAGE_KERNEL, 0);
 739         }
 740 #endif
 741
 742         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
 743         memset(empty_zero_page, 0, PAGE_SIZE);
 744 }
 745
 746 static void __init gateway_init(void)
 747 {
 748         unsigned long linux_gateway_page_addr;
 749         /* FIXME: This is 'const' in order to trick the compiler
 750            into not treating it as DP-relative data. */
 751         extern void * const linux_gateway_page;
 752
 753         linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
 754
 755         /*
 756          * Setup Linux Gateway page.
 757          *
 758          * The Linux gateway page will reside in kernel space (on virtual
 759          * page 0), so it doesn't need to be aliased into user space.
 760          */
 761
 762         map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
 763                   PAGE_SIZE, PAGE_GATEWAY, 1);
 764 }
 765
 766 #ifdef CONFIG_HPUX
 767 void
 768 map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
 769 {
 770         pgd_t *pg_dir;
 771         pmd_t *pmd;
 772         pte_t *pg_table;
 773         unsigned long start_pmd;
 774         unsigned long start_pte;
 775         unsigned long address;
 776         unsigned long hpux_gw_page_addr;
 777         /* FIXME: This is 'const' in order to trick the compiler
 778            into not treating it as DP-relative data. */
 779         extern void * const hpux_gateway_page;
 780
 781         hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
 782
 783         /*
 784          * Setup HP-UX Gateway page.
 785          *
 786          * The HP-UX gateway page resides in the user address space,
 787          * so it needs to be aliased into each process.
 788          */
 789
 790         pg_dir = pgd_offset(mm,hpux_gw_page_addr);
 791
 792 #if PTRS_PER_PMD == 1
 793         start_pmd = 0;
 794 #else
 795         start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 796 #endif
 797         start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
 798
 799         address = __pa(&hpux_gateway_page);
 800 #if PTRS_PER_PMD == 1
 801         pmd = (pmd_t *)__pa(pg_dir);
 802 #else
 803         pmd = (pmd_t *) pgd_address(*pg_dir);
 804
 805         /*
 806          * pmd is physical at this point
 807          */
 808
 809         if (!pmd) {
 810                 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
 811                 pmd = (pmd_t *) __pa(pmd);
 812         }
 813
 814         __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
 815 #endif
 816         /* now change pmd to kernel virtual addresses */
 817
 818         pmd = (pmd_t *)__va(pmd) + start_pmd;
 819
 820         /*
 821          * pg_table is physical at this point
 822          */
 823
 824         pg_table = (pte_t *) pmd_address(*pmd);
 825         if (!pg_table)
 826                 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
 827
 828         __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
 829
 830         /* now change pg_table to kernel virtual addresses */
 831
 832         pg_table = (pte_t *) __va(pg_table) + start_pte;
 833         set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
 834 }
 835 EXPORT_SYMBOL(map_hpux_gateway_page);
 836 #endif
 837
 838 void __init paging_init(void)
 839 {
 840         int i;
 841
 842         setup_bootmem();
 843         pagetable_init();
 844         gateway_init();
 845         flush_cache_all_local(); /* start with known state */
 846         flush_tlb_all_local(NULL);
 847
 848         for (i = 0; i < npmem_ranges; i++) {
 849                 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
 850
 851                 zones_size[ZONE_NORMAL] = pmem_ranges[i].pages;
 852
 853 #ifdef CONFIG_DISCONTIGMEM
 854                 /* Need to initialize the pfnnid_map before we can initialize
 855                    the zone */
 856                 {
 857                     int j;
 858                     for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
 859                          j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
 860                          j++) {
 861                         pfnnid_map[j] = i;
 862                     }
 863                 }
 864 #endif
 865
 866                 free_area_init_node(i, zones_size,
 867                                 pmem_ranges[i].start_pfn, NULL);
 868         }
 869 }
 870
 871 #ifdef CONFIG_PA20
 872
 873 /*
 874  * Currently, all PA20 chips have 18 bit protection IDs, which is the
 875  * limiting factor (space ids are 32 bits).
 876  */
 877
 878 #define NR_SPACE_IDS 262144
 879
 880 #else
 881
 882 /*
 883  * Currently we have a one-to-one relationship between space IDs and
 884  * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
 885  * support 15 bit protection IDs, so that is the limiting factor.
 886  * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
 887  * probably not worth the effort for a special case here.
 888  */
 889
 890 #define NR_SPACE_IDS 32768
 891
 892 #endif  /* !CONFIG_PA20 */
 893
 894 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
 895 #define SID_ARRAY_SIZE  (NR_SPACE_IDS / (8 * sizeof(long)))
 896
 897 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
 898 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
 899 static unsigned long space_id_index;
 900 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
 901 static unsigned long dirty_space_ids = 0;
 902
 903 static DEFINE_SPINLOCK(sid_lock);
 904
 905 unsigned long alloc_sid(void)
 906 {
 907         unsigned long index;
 908
 909         spin_lock(&sid_lock);
 910
 911         if (free_space_ids == 0) {
 912                 if (dirty_space_ids != 0) {
 913                         spin_unlock(&sid_lock);
 914                         flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
 915                         spin_lock(&sid_lock);
 916                 }
 917                 BUG_ON(free_space_ids == 0);
 918         }
 919
 920         free_space_ids--;
 921
 922         index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
 923         space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
 924         space_id_index = index;
 925
 926         spin_unlock(&sid_lock);
 927
 928         return index << SPACEID_SHIFT;
 929 }
 930
 931 void free_sid(unsigned long spaceid)
 932 {
 933         unsigned long index = spaceid >> SPACEID_SHIFT;
 934         unsigned long *dirty_space_offset;
 935
 936         dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
 937         index &= (BITS_PER_LONG - 1);
 938
 939         spin_lock(&sid_lock);
 940
 941         BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
 942
 943         *dirty_space_offset |= (1L << index);
 944         dirty_space_ids++;
 945
 946         spin_unlock(&sid_lock);
 947 }
 948
 949
 950 #ifdef CONFIG_SMP
 951 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
 952 {
 953         int i;
 954
 955         /* NOTE: sid_lock must be held upon entry */
 956
 957         *ndirtyptr = dirty_space_ids;
 958         if (dirty_space_ids != 0) {
 959             for (i = 0; i < SID_ARRAY_SIZE; i++) {
 960                 dirty_array[i] = dirty_space_id[i];
 961                 dirty_space_id[i] = 0;
 962             }
 963             dirty_space_ids = 0;
 964         }
 965
 966         return;
 967 }
 968
 969 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
 970 {
 971         int i;
 972
 973         /* NOTE: sid_lock must be held upon entry */
 974
 975         if (ndirty != 0) {
 976                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 977                         space_id[i] ^= dirty_array[i];
 978                 }
 979
 980                 free_space_ids += ndirty;
 981                 space_id_index = 0;
 982         }
 983 }
 984
 985 #else /* CONFIG_SMP */
 986
 987 static void recycle_sids(void)
 988 {
 989         int i;
 990
 991         /* NOTE: sid_lock must be held upon entry */
 992
 993         if (dirty_space_ids != 0) {
 994                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
 995                         space_id[i] ^= dirty_space_id[i];
 996                         dirty_space_id[i] = 0;
 997                 }
 998
 999                 free_space_ids += dirty_space_ids;
1000                 dirty_space_ids = 0;
1001                 space_id_index = 0;
1002         }
1003 }
1004 #endif
1005
1006 /*
1007  * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
1008  * purged, we can safely reuse the space ids that were released but
1009  * not flushed from the tlb.
1010  */
1011
1012 #ifdef CONFIG_SMP
1013
1014 static unsigned long recycle_ndirty;
1015 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
1016 static unsigned int recycle_inuse;
1017
1018 void flush_tlb_all(void)
1019 {
1020         int do_recycle;
1021
1022         __inc_irq_stat(irq_tlb_count);
1023         do_recycle = 0;
1024         spin_lock(&sid_lock);
1025         if (dirty_space_ids > RECYCLE_THRESHOLD) {
1026             BUG_ON(recycle_inuse);  /* FIXME: Use a semaphore/wait queue here */
1027             get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
1028             recycle_inuse++;
1029             do_recycle++;
1030         }
1031         spin_unlock(&sid_lock);
1032         on_each_cpu(flush_tlb_all_local, NULL, 1);
1033         if (do_recycle) {
1034             spin_lock(&sid_lock);
1035             recycle_sids(recycle_ndirty,recycle_dirty_array);
1036             recycle_inuse = 0;
1037             spin_unlock(&sid_lock);
1038         }
1039 }
1040 #else
1041 void flush_tlb_all(void)
1042 {
1043         __inc_irq_stat(irq_tlb_count);
1044         spin_lock(&sid_lock);
1045         flush_tlb_all_local(NULL);
1046         recycle_sids();
1047         spin_unlock(&sid_lock);
1048 }
1049 #endif
1050
1051 #ifdef CONFIG_BLK_DEV_INITRD
1052 void free_initrd_mem(unsigned long start, unsigned long end)
1053 {
1054         free_reserved_area((void *)start, (void *)end, -1, "initrd");
1055 }
1056 #endif