arch/ia64/mm/init.c

   1 /*
   2  * Initialize MMU support.
   3  *
   4  * Copyright (C) 1998-2003 Hewlett-Packard Co
   5  *      David Mosberger-Tang <davidm@hpl.hp.com>
   6  */
   7 #include <linux/kernel.h>
   8 #include <linux/init.h>
   9
  10 #include <linux/bootmem.h>
  11 #include <linux/efi.h>
  12 #include <linux/elf.h>
  13 #include <linux/mm.h>
  14 #include <linux/mmzone.h>
  15 #include <linux/module.h>
  16 #include <linux/personality.h>
  17 #include <linux/reboot.h>
  18 #include <linux/slab.h>
  19 #include <linux/swap.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/bitops.h>
  22 #include <linux/kexec.h>
  23
  24 #include <asm/dma.h>
  25 #include <asm/ia32.h>
  26 #include <asm/io.h>
  27 #include <asm/machvec.h>
  28 #include <asm/numa.h>
  29 #include <asm/patch.h>
  30 #include <asm/pgalloc.h>
  31 #include <asm/sal.h>
  32 #include <asm/sections.h>
  33 #include <asm/system.h>
  34 #include <asm/tlb.h>
  35 #include <asm/uaccess.h>
  36 #include <asm/unistd.h>
  37 #include <asm/mca.h>
  38 #include <asm/paravirt.h>
  39
  40 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  41
  42 extern void ia64_tlb_init (void);
  43
  44 unsigned long MAX_DMA_ADDRESS = PAGE_OFFSET + 0x100000000UL;
  45
  46 #ifdef CONFIG_VIRTUAL_MEM_MAP
  47 unsigned long vmalloc_end = VMALLOC_END_INIT;
  48 EXPORT_SYMBOL(vmalloc_end);
  49 struct page *vmem_map;
  50 EXPORT_SYMBOL(vmem_map);
  51 #endif
  52
  53 struct page *zero_page_memmap_ptr;      /* map entry for zero page */
  54 EXPORT_SYMBOL(zero_page_memmap_ptr);
  55
  56 void
  57 __ia64_sync_icache_dcache (pte_t pte)
  58 {
  59         unsigned long addr;
  60         struct page *page;
  61
  62         page = pte_page(pte);
  63         addr = (unsigned long) page_address(page);
  64
  65         if (test_bit(PG_arch_1, &page->flags))
  66                 return;                         /* i-cache is already coherent with d-cache */
  67
  68         flush_icache_range(addr, addr + (PAGE_SIZE << compound_order(page)));
  69         set_bit(PG_arch_1, &page->flags);       /* mark page as clean */
  70 }
  71
  72 /*
  73  * Since DMA is i-cache coherent, any (complete) pages that were written via
  74  * DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to
  75  * flush them when they get mapped into an executable vm-area.
  76  */
  77 void
  78 dma_mark_clean(void *addr, size_t size)
  79 {
  80         unsigned long pg_addr, end;
  81
  82         pg_addr = PAGE_ALIGN((unsigned long) addr);
  83         end = (unsigned long) addr + size;
  84         while (pg_addr + PAGE_SIZE <= end) {
  85                 struct page *page = virt_to_page(pg_addr);
  86                 set_bit(PG_arch_1, &page->flags);
  87                 pg_addr += PAGE_SIZE;
  88         }
  89 }
  90
  91 inline void
  92 ia64_set_rbs_bot (void)
  93 {
  94         unsigned long stack_size = current->signal->rlim[RLIMIT_STACK].rlim_max & -16;
  95
  96         if (stack_size > MAX_USER_STACK_SIZE)
  97                 stack_size = MAX_USER_STACK_SIZE;
  98         current->thread.rbs_bot = PAGE_ALIGN(current->mm->start_stack - stack_size);
  99 }
 100
 101 /*
 102  * This performs some platform-dependent address space initialization.
 103  * On IA-64, we want to setup the VM area for the register backing
 104  * store (which grows upwards) and install the gateway page which is
 105  * used for signal trampolines, etc.
 106  */
 107 void
 108 ia64_init_addr_space (void)
 109 {
 110         struct vm_area_struct *vma;
 111
 112         ia64_set_rbs_bot();
 113
 114         /*
 115          * If we're out of memory and kmem_cache_alloc() returns NULL, we simply ignore
 116          * the problem.  When the process attempts to write to the register backing store
 117          * for the first time, it will get a SEGFAULT in this case.
 118          */
 119         vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
 120         if (vma) {
 121                 vma->vm_mm = current->mm;
 122                 vma->vm_start = current->thread.rbs_bot & PAGE_MASK;
 123                 vma->vm_end = vma->vm_start + PAGE_SIZE;
 124                 vma->vm_flags = VM_DATA_DEFAULT_FLAGS|VM_GROWSUP|VM_ACCOUNT;
 125                 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 126                 down_write(&current->mm->mmap_sem);
 127                 if (insert_vm_struct(current->mm, vma)) {
 128                         up_write(&current->mm->mmap_sem);
 129                         kmem_cache_free(vm_area_cachep, vma);
 130                         return;
 131                 }
 132                 up_write(&current->mm->mmap_sem);
 133         }
 134
 135         /* map NaT-page at address zero to speed up speculative dereferencing of NULL: */
 136         if (!(current->personality & MMAP_PAGE_ZERO)) {
 137                 vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
 138                 if (vma) {
 139                         vma->vm_mm = current->mm;
 140                         vma->vm_end = PAGE_SIZE;
 141                         vma->vm_page_prot = __pgprot(pgprot_val(PAGE_READONLY) | _PAGE_MA_NAT);
 142                         vma->vm_flags = VM_READ | VM_MAYREAD | VM_IO | VM_RESERVED;
 143                         down_write(&current->mm->mmap_sem);
 144                         if (insert_vm_struct(current->mm, vma)) {
 145                                 up_write(&current->mm->mmap_sem);
 146                                 kmem_cache_free(vm_area_cachep, vma);
 147                                 return;
 148                         }
 149                         up_write(&current->mm->mmap_sem);
 150                 }
 151         }
 152 }
 153
 154 void
 155 free_initmem (void)
 156 {
 157         unsigned long addr, eaddr;
 158
 159         addr = (unsigned long) ia64_imva(__init_begin);
 160         eaddr = (unsigned long) ia64_imva(__init_end);
 161         while (addr < eaddr) {
 162                 ClearPageReserved(virt_to_page(addr));
 163                 init_page_count(virt_to_page(addr));
 164                 free_page(addr);
 165                 ++totalram_pages;
 166                 addr += PAGE_SIZE;
 167         }
 168         printk(KERN_INFO "Freeing unused kernel memory: %ldkB freed\n",
 169                (__init_end - __init_begin) >> 10);
 170 }
 171
 172 void __init
 173 free_initrd_mem (unsigned long start, unsigned long end)
 174 {
 175         struct page *page;
 176         /*
 177          * EFI uses 4KB pages while the kernel can use 4KB or bigger.
 178          * Thus EFI and the kernel may have different page sizes. It is
 179          * therefore possible to have the initrd share the same page as
 180          * the end of the kernel (given current setup).
 181          *
 182          * To avoid freeing/using the wrong page (kernel sized) we:
 183          *      - align up the beginning of initrd
 184          *      - align down the end of initrd
 185          *
 186          *  |             |
 187          *  |=============| a000
 188          *  |             |
 189          *  |             |
 190          *  |             | 9000
 191          *  |/////////////|
 192          *  |/////////////|
 193          *  |=============| 8000
 194          *  |///INITRD////|
 195          *  |/////////////|
 196          *  |/////////////| 7000
 197          *  |             |
 198          *  |KKKKKKKKKKKKK|
 199          *  |=============| 6000
 200          *  |KKKKKKKKKKKKK|
 201          *  |KKKKKKKKKKKKK|
 202          *  K=kernel using 8KB pages
 203          *
 204          * In this example, we must free page 8000 ONLY. So we must align up
 205          * initrd_start and keep initrd_end as is.
 206          */
 207         start = PAGE_ALIGN(start);
 208         end = end & PAGE_MASK;
 209
 210         if (start < end)
 211                 printk(KERN_INFO "Freeing initrd memory: %ldkB freed\n", (end - start) >> 10);
 212
 213         for (; start < end; start += PAGE_SIZE) {
 214                 if (!virt_addr_valid(start))
 215                         continue;
 216                 page = virt_to_page(start);
 217                 ClearPageReserved(page);
 218                 init_page_count(page);
 219                 free_page(start);
 220                 ++totalram_pages;
 221         }
 222 }
 223
 224 /*
 225  * This installs a clean page in the kernel's page table.
 226  */
 227 static struct page * __init
 228 put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot)
 229 {
 230         pgd_t *pgd;
 231         pud_t *pud;
 232         pmd_t *pmd;
 233         pte_t *pte;
 234
 235         if (!PageReserved(page))
 236                 printk(KERN_ERR "put_kernel_page: page at 0x%p not in reserved memory\n",
 237                        page_address(page));
 238
 239         pgd = pgd_offset_k(address);            /* note: this is NOT pgd_offset()! */
 240
 241         {
 242                 pud = pud_alloc(&init_mm, pgd, address);
 243                 if (!pud)
 244                         goto out;
 245                 pmd = pmd_alloc(&init_mm, pud, address);
 246                 if (!pmd)
 247                         goto out;
 248                 pte = pte_alloc_kernel(pmd, address);
 249                 if (!pte)
 250                         goto out;
 251                 if (!pte_none(*pte))
 252                         goto out;
 253                 set_pte(pte, mk_pte(page, pgprot));
 254         }
 255   out:
 256         /* no need for flush_tlb */
 257         return page;
 258 }
 259
 260 static void __init
 261 setup_gate (void)
 262 {
 263         void *gate_section;
 264         struct page *page;
 265
 266         /*
 267          * Map the gate page twice: once read-only to export the ELF
 268          * headers etc. and once execute-only page to enable
 269          * privilege-promotion via "epc":
 270          */
 271         gate_section = paravirt_get_gate_section();
 272         page = virt_to_page(ia64_imva(gate_section));
 273         put_kernel_page(page, GATE_ADDR, PAGE_READONLY);
 274 #ifdef HAVE_BUGGY_SEGREL
 275         page = virt_to_page(ia64_imva(gate_section + PAGE_SIZE));
 276         put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE);
 277 #else
 278         put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE);
 279         /* Fill in the holes (if any) with read-only zero pages: */
 280         {
 281                 unsigned long addr;
 282
 283                 for (addr = GATE_ADDR + PAGE_SIZE;
 284                      addr < GATE_ADDR + PERCPU_PAGE_SIZE;
 285                      addr += PAGE_SIZE)
 286                 {
 287                         put_kernel_page(ZERO_PAGE(0), addr,
 288                                         PAGE_READONLY);
 289                         put_kernel_page(ZERO_PAGE(0), addr + PERCPU_PAGE_SIZE,
 290                                         PAGE_READONLY);
 291                 }
 292         }
 293 #endif
 294         ia64_patch_gate();
 295 }
 296
 297 void __devinit
 298 ia64_mmu_init (void *my_cpu_data)
 299 {
 300         unsigned long pta, impl_va_bits;
 301         extern void __devinit tlb_init (void);
 302
 303 #ifdef CONFIG_DISABLE_VHPT
 304 #       define VHPT_ENABLE_BIT  0
 305 #else
 306 #       define VHPT_ENABLE_BIT  1
 307 #endif
 308
 309         /*
 310          * Check if the virtually mapped linear page table (VMLPT) overlaps with a mapped
 311          * address space.  The IA-64 architecture guarantees that at least 50 bits of
 312          * virtual address space are implemented but if we pick a large enough page size
 313          * (e.g., 64KB), the mapped address space is big enough that it will overlap with
 314          * VMLPT.  I assume that once we run on machines big enough to warrant 64KB pages,
 315          * IMPL_VA_MSB will be significantly bigger, so this is unlikely to become a
 316          * problem in practice.  Alternatively, we could truncate the top of the mapped
 317          * address space to not permit mappings that would overlap with the VMLPT.
 318          * --davidm 00/12/06
 319          */
 320 #       define pte_bits                 3
 321 #       define mapped_space_bits        (3*(PAGE_SHIFT - pte_bits) + PAGE_SHIFT)
 322         /*
 323          * The virtual page table has to cover the entire implemented address space within
 324          * a region even though not all of this space may be mappable.  The reason for
 325          * this is that the Access bit and Dirty bit fault handlers perform
 326          * non-speculative accesses to the virtual page table, so the address range of the
 327          * virtual page table itself needs to be covered by virtual page table.
 328          */
 329 #       define vmlpt_bits               (impl_va_bits - PAGE_SHIFT + pte_bits)
 330 #       define POW2(n)                  (1ULL << (n))
 331
 332         impl_va_bits = ffz(~(local_cpu_data->unimpl_va_mask | (7UL << 61)));
 333
 334         if (impl_va_bits < 51 || impl_va_bits > 61)
 335                 panic("CPU has bogus IMPL_VA_MSB value of %lu!\n", impl_va_bits - 1);
 336         /*
 337          * mapped_space_bits - PAGE_SHIFT is the total number of ptes we need,
 338          * which must fit into "vmlpt_bits - pte_bits" slots. Second half of
 339          * the test makes sure that our mapped space doesn't overlap the
 340          * unimplemented hole in the middle of the region.
 341          */
 342         if ((mapped_space_bits - PAGE_SHIFT > vmlpt_bits - pte_bits) ||
 343             (mapped_space_bits > impl_va_bits - 1))
 344                 panic("Cannot build a big enough virtual-linear page table"
 345                       " to cover mapped address space.\n"
 346                       " Try using a smaller page size.\n");
 347
 348
 349         /* place the VMLPT at the end of each page-table mapped region: */
 350         pta = POW2(61) - POW2(vmlpt_bits);
 351
 352         /*
 353          * Set the (virtually mapped linear) page table address.  Bit
 354          * 8 selects between the short and long format, bits 2-7 the
 355          * size of the table, and bit 0 whether the VHPT walker is
 356          * enabled.
 357          */
 358         ia64_set_pta(pta | (0 << 8) | (vmlpt_bits << 2) | VHPT_ENABLE_BIT);
 359
 360         ia64_tlb_init();
 361
 362 #ifdef  CONFIG_HUGETLB_PAGE
 363         ia64_set_rr(HPAGE_REGION_BASE, HPAGE_SHIFT << 2);
 364         ia64_srlz_d();
 365 #endif
 366 }
 367
 368 #ifdef CONFIG_VIRTUAL_MEM_MAP
 369 int vmemmap_find_next_valid_pfn(int node, int i)
 370 {
 371         unsigned long end_address, hole_next_pfn;
 372         unsigned long stop_address;
 373         pg_data_t *pgdat = NODE_DATA(node);
 374
 375         end_address = (unsigned long) &vmem_map[pgdat->node_start_pfn + i];
 376         end_address = PAGE_ALIGN(end_address);
 377
 378         stop_address = (unsigned long) &vmem_map[
 379                 pgdat->node_start_pfn + pgdat->node_spanned_pages];
 380
 381         do {
 382                 pgd_t *pgd;
 383                 pud_t *pud;
 384                 pmd_t *pmd;
 385                 pte_t *pte;
 386
 387                 pgd = pgd_offset_k(end_address);
 388                 if (pgd_none(*pgd)) {
 389                         end_address += PGDIR_SIZE;
 390                         continue;
 391                 }
 392
 393                 pud = pud_offset(pgd, end_address);
 394                 if (pud_none(*pud)) {
 395                         end_address += PUD_SIZE;
 396                         continue;
 397                 }
 398
 399                 pmd = pmd_offset(pud, end_address);
 400                 if (pmd_none(*pmd)) {
 401                         end_address += PMD_SIZE;
 402                         continue;
 403                 }
 404
 405                 pte = pte_offset_kernel(pmd, end_address);
 406 retry_pte:
 407                 if (pte_none(*pte)) {
 408                         end_address += PAGE_SIZE;
 409                         pte++;
 410                         if ((end_address < stop_address) &&
 411                             (end_address != ALIGN(end_address, 1UL << PMD_SHIFT)))
 412                                 goto retry_pte;
 413                         continue;
 414                 }
 415                 /* Found next valid vmem_map page */
 416                 break;
 417         } while (end_address < stop_address);
 418
 419         end_address = min(end_address, stop_address);
 420         end_address = end_address - (unsigned long) vmem_map + sizeof(struct page) - 1;
 421         hole_next_pfn = end_address / sizeof(struct page);
 422         return hole_next_pfn - pgdat->node_start_pfn;
 423 }
 424
 425 int __init create_mem_map_page_table(u64 start, u64 end, void *arg)
 426 {
 427         unsigned long address, start_page, end_page;
 428         struct page *map_start, *map_end;
 429         int node;
 430         pgd_t *pgd;
 431         pud_t *pud;
 432         pmd_t *pmd;
 433         pte_t *pte;
 434
 435         map_start = vmem_map + (__pa(start) >> PAGE_SHIFT);
 436         map_end   = vmem_map + (__pa(end) >> PAGE_SHIFT);
 437
 438         start_page = (unsigned long) map_start & PAGE_MASK;
 439         end_page = PAGE_ALIGN((unsigned long) map_end);
 440         node = paddr_to_nid(__pa(start));
 441
 442         for (address = start_page; address < end_page; address += PAGE_SIZE) {
 443                 pgd = pgd_offset_k(address);
 444                 if (pgd_none(*pgd))
 445                         pgd_populate(&init_mm, pgd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
 446                 pud = pud_offset(pgd, address);
 447
 448                 if (pud_none(*pud))
 449                         pud_populate(&init_mm, pud, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
 450                 pmd = pmd_offset(pud, address);
 451
 452                 if (pmd_none(*pmd))
 453                         pmd_populate_kernel(&init_mm, pmd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
 454                 pte = pte_offset_kernel(pmd, address);
 455
 456                 if (pte_none(*pte))
 457                         set_pte(pte, pfn_pte(__pa(alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)) >> PAGE_SHIFT,
 458                                              PAGE_KERNEL));
 459         }
 460         return 0;
 461 }
 462
 463 struct memmap_init_callback_data {
 464         struct page *start;
 465         struct page *end;
 466         int nid;
 467         unsigned long zone;
 468 };
 469
 470 static int __meminit
 471 virtual_memmap_init(u64 start, u64 end, void *arg)
 472 {
 473         struct memmap_init_callback_data *args;
 474         struct page *map_start, *map_end;
 475
 476         args = (struct memmap_init_callback_data *) arg;
 477         map_start = vmem_map + (__pa(start) >> PAGE_SHIFT);
 478         map_end   = vmem_map + (__pa(end) >> PAGE_SHIFT);
 479
 480         if (map_start < args->start)
 481                 map_start = args->start;
 482         if (map_end > args->end)
 483                 map_end = args->end;
 484
 485         /*
 486          * We have to initialize "out of bounds" struct page elements that fit completely
 487          * on the same pages that were allocated for the "in bounds" elements because they
 488          * may be referenced later (and found to be "reserved").
 489          */
 490         map_start -= ((unsigned long) map_start & (PAGE_SIZE - 1)) / sizeof(struct page);
 491         map_end += ((PAGE_ALIGN((unsigned long) map_end) - (unsigned long) map_end)
 492                     / sizeof(struct page));
 493
 494         if (map_start < map_end)
 495                 memmap_init_zone((unsigned long)(map_end - map_start),
 496                                  args->nid, args->zone, page_to_pfn(map_start),
 497                                  MEMMAP_EARLY);
 498         return 0;
 499 }
 500
 501 void __meminit
 502 memmap_init (unsigned long size, int nid, unsigned long zone,
 503              unsigned long start_pfn)
 504 {
 505         if (!vmem_map)
 506                 memmap_init_zone(size, nid, zone, start_pfn, MEMMAP_EARLY);
 507         else {
 508                 struct page *start;
 509                 struct memmap_init_callback_data args;
 510
 511                 start = pfn_to_page(start_pfn);
 512                 args.start = start;
 513                 args.end = start + size;
 514                 args.nid = nid;
 515                 args.zone = zone;
 516
 517                 efi_memmap_walk(virtual_memmap_init, &args);
 518         }
 519 }
 520
 521 int
 522 ia64_pfn_valid (unsigned long pfn)
 523 {
 524         char byte;
 525         struct page *pg = pfn_to_page(pfn);
 526
 527         return     (__get_user(byte, (char __user *) pg) == 0)
 528                 && ((((u64)pg & PAGE_MASK) == (((u64)(pg + 1) - 1) & PAGE_MASK))
 529                         || (__get_user(byte, (char __user *) (pg + 1) - 1) == 0));
 530 }
 531 EXPORT_SYMBOL(ia64_pfn_valid);
 532
 533 int __init find_largest_hole(u64 start, u64 end, void *arg)
 534 {
 535         u64 *max_gap = arg;
 536
 537         static u64 last_end = PAGE_OFFSET;
 538
 539         /* NOTE: this algorithm assumes efi memmap table is ordered */
 540
 541         if (*max_gap < (start - last_end))
 542                 *max_gap = start - last_end;
 543         last_end = end;
 544         return 0;
 545 }
 546
 547 #endif /* CONFIG_VIRTUAL_MEM_MAP */
 548
 549 int __init register_active_ranges(u64 start, u64 len, int nid)
 550 {
 551         u64 end = start + len;
 552
 553 #ifdef CONFIG_KEXEC
 554         if (start > crashk_res.start && start < crashk_res.end)
 555                 start = crashk_res.end;
 556         if (end > crashk_res.start && end < crashk_res.end)
 557                 end = crashk_res.start;
 558 #endif
 559
 560         if (start < end)
 561                 add_active_range(nid, __pa(start) >> PAGE_SHIFT,
 562                         __pa(end) >> PAGE_SHIFT);
 563         return 0;
 564 }
 565
 566 static int __init
 567 count_reserved_pages(u64 start, u64 end, void *arg)
 568 {
 569         unsigned long num_reserved = 0;
 570         unsigned long *count = arg;
 571
 572         for (; start < end; start += PAGE_SIZE)
 573                 if (PageReserved(virt_to_page(start)))
 574                         ++num_reserved;
 575         *count += num_reserved;
 576         return 0;
 577 }
 578
 579 int
 580 find_max_min_low_pfn (u64 start, u64 end, void *arg)
 581 {
 582         unsigned long pfn_start, pfn_end;
 583 #ifdef CONFIG_FLATMEM
 584         pfn_start = (PAGE_ALIGN(__pa(start))) >> PAGE_SHIFT;
 585         pfn_end = (PAGE_ALIGN(__pa(end - 1))) >> PAGE_SHIFT;
 586 #else
 587         pfn_start = GRANULEROUNDDOWN(__pa(start)) >> PAGE_SHIFT;
 588         pfn_end = GRANULEROUNDUP(__pa(end - 1)) >> PAGE_SHIFT;
 589 #endif
 590         min_low_pfn = min(min_low_pfn, pfn_start);
 591         max_low_pfn = max(max_low_pfn, pfn_end);
 592         return 0;
 593 }
 594
 595 /*
 596  * Boot command-line option "nolwsys" can be used to disable the use of any light-weight
 597  * system call handler.  When this option is in effect, all fsyscalls will end up bubbling
 598  * down into the kernel and calling the normal (heavy-weight) syscall handler.  This is
 599  * useful for performance testing, but conceivably could also come in handy for debugging
 600  * purposes.
 601  */
 602
 603 static int nolwsys __initdata;
 604
 605 static int __init
 606 nolwsys_setup (char *s)
 607 {
 608         nolwsys = 1;
 609         return 1;
 610 }
 611
 612 __setup("nolwsys", nolwsys_setup);
 613
 614 void __init
 615 mem_init (void)
 616 {
 617         long reserved_pages, codesize, datasize, initsize;
 618         pg_data_t *pgdat;
 619         int i;
 620
 621         BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE);
 622         BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE);
 623         BUG_ON(PTRS_PER_PTE * sizeof(pte_t) != PAGE_SIZE);
 624
 625 #ifdef CONFIG_PCI
 626         /*
 627          * This needs to be called _after_ the command line has been parsed but _before_
 628          * any drivers that may need the PCI DMA interface are initialized or bootmem has
 629          * been freed.
 630          */
 631         platform_dma_init();
 632 #endif
 633
 634 #ifdef CONFIG_FLATMEM
 635         BUG_ON(!mem_map);
 636         max_mapnr = max_low_pfn;
 637 #endif
 638
 639         high_memory = __va(max_low_pfn * PAGE_SIZE);
 640
 641         for_each_online_pgdat(pgdat)
 642                 if (pgdat->bdata->node_bootmem_map)
 643                         totalram_pages += free_all_bootmem_node(pgdat);
 644
 645         reserved_pages = 0;
 646         efi_memmap_walk(count_reserved_pages, &reserved_pages);
 647
 648         codesize =  (unsigned long) _etext - (unsigned long) _stext;
 649         datasize =  (unsigned long) _edata - (unsigned long) _etext;
 650         initsize =  (unsigned long) __init_end - (unsigned long) __init_begin;
 651
 652         printk(KERN_INFO "Memory: %luk/%luk available (%luk code, %luk reserved, "
 653                "%luk data, %luk init)\n", nr_free_pages() << (PAGE_SHIFT - 10),
 654                num_physpages << (PAGE_SHIFT - 10), codesize >> 10,
 655                reserved_pages << (PAGE_SHIFT - 10), datasize >> 10, initsize >> 10);
 656
 657
 658         /*
 659          * For fsyscall entrpoints with no light-weight handler, use the ordinary
 660          * (heavy-weight) handler, but mark it by setting bit 0, so the fsyscall entry
 661          * code can tell them apart.
 662          */
 663         for (i = 0; i < NR_syscalls; ++i) {
 664                 extern unsigned long sys_call_table[NR_syscalls];
 665                 unsigned long *fsyscall_table = paravirt_get_fsyscall_table();
 666
 667                 if (!fsyscall_table[i] || nolwsys)
 668                         fsyscall_table[i] = sys_call_table[i] | 1;
 669         }
 670         setup_gate();
 671
 672 #ifdef CONFIG_IA32_SUPPORT
 673         ia32_mem_init();
 674 #endif
 675 }
 676
 677 #ifdef CONFIG_MEMORY_HOTPLUG
 678 int arch_add_memory(int nid, u64 start, u64 size)
 679 {
 680         pg_data_t *pgdat;
 681         struct zone *zone;
 682         unsigned long start_pfn = start >> PAGE_SHIFT;
 683         unsigned long nr_pages = size >> PAGE_SHIFT;
 684         int ret;
 685
 686         pgdat = NODE_DATA(nid);
 687
 688         zone = pgdat->node_zones + ZONE_NORMAL;
 689         ret = __add_pages(nid, zone, start_pfn, nr_pages);
 690
 691         if (ret)
 692                 printk("%s: Problem encountered in __add_pages() as ret=%d\n",
 693                        __func__,  ret);
 694
 695         return ret;
 696 }
 697 #endif
 698
 699 /*
 700  * Even when CONFIG_IA32_SUPPORT is not enabled it is
 701  * useful to have the Linux/x86 domain registered to
 702  * avoid an attempted module load when emulators call
 703  * personality(PER_LINUX32). This saves several milliseconds
 704  * on each such call.
 705  */
 706 static struct exec_domain ia32_exec_domain;
 707
 708 static int __init
 709 per_linux32_init(void)
 710 {
 711         ia32_exec_domain.name = "Linux/x86";
 712         ia32_exec_domain.handler = NULL;
 713         ia32_exec_domain.pers_low = PER_LINUX32;
 714         ia32_exec_domain.pers_high = PER_LINUX32;
 715         ia32_exec_domain.signal_map = default_exec_domain.signal_map;
 716         ia32_exec_domain.signal_invmap = default_exec_domain.signal_invmap;
 717         register_exec_domain(&ia32_exec_domain);
 718
 719         return 0;
 720 }
 721
 722 __initcall(per_linux32_init);