arch/powerpc/kernel/vdso.c

   1
   2 /*
   3  *    Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
   4  *                       <benh@kernel.crashing.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU General Public License
   8  *  as published by the Free Software Foundation; either version
   9  *  2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/errno.h>
  13 #include <linux/sched.h>
  14 #include <linux/kernel.h>
  15 #include <linux/mm.h>
  16 #include <linux/smp.h>
  17 #include <linux/stddef.h>
  18 #include <linux/unistd.h>
  19 #include <linux/slab.h>
  20 #include <linux/user.h>
  21 #include <linux/elf.h>
  22 #include <linux/security.h>
  23 #include <linux/memblock.h>
  24
  25 #include <asm/pgtable.h>
  26 #include <asm/processor.h>
  27 #include <asm/mmu.h>
  28 #include <asm/mmu_context.h>
  29 #include <asm/prom.h>
  30 #include <asm/machdep.h>
  31 #include <asm/cputable.h>
  32 #include <asm/sections.h>
  33 #include <asm/firmware.h>
  34 #include <asm/vdso.h>
  35 #include <asm/vdso_datapage.h>
  36 #include <asm/setup.h>
  37
  38 #undef DEBUG
  39
  40 #ifdef DEBUG
  41 #define DBG(fmt...) printk(fmt)
  42 #else
  43 #define DBG(fmt...)
  44 #endif
  45
  46 /* Max supported size for symbol names */
  47 #define MAX_SYMNAME     64
  48
  49 /* The alignment of the vDSO */
  50 #define VDSO_ALIGNMENT  (1 << 16)
  51
  52 static unsigned int vdso32_pages;
  53 static void *vdso32_kbase;
  54 static struct page **vdso32_pagelist;
  55 unsigned long vdso32_sigtramp;
  56 unsigned long vdso32_rt_sigtramp;
  57
  58 #ifdef CONFIG_VDSO32
  59 extern char vdso32_start, vdso32_end;
  60 #endif
  61
  62 #ifdef CONFIG_PPC64
  63 extern char vdso64_start, vdso64_end;
  64 static void *vdso64_kbase = &vdso64_start;
  65 static unsigned int vdso64_pages;
  66 static struct page **vdso64_pagelist;
  67 unsigned long vdso64_rt_sigtramp;
  68 #endif /* CONFIG_PPC64 */
  69
  70 static int vdso_ready;
  71
  72 /*
  73  * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
  74  * Once the early boot kernel code no longer needs to muck around
  75  * with it, it will become dynamically allocated
  76  */
  77 static union {
  78         struct vdso_data        data;
  79         u8                      page[PAGE_SIZE];
  80 } vdso_data_store __page_aligned_data;
  81 struct vdso_data *vdso_data = &vdso_data_store.data;
  82
  83 /* Format of the patch table */
  84 struct vdso_patch_def
  85 {
  86         unsigned long   ftr_mask, ftr_value;
  87         const char      *gen_name;
  88         const char      *fix_name;
  89 };
  90
  91 /* Table of functions to patch based on the CPU type/revision
  92  *
  93  * Currently, we only change sync_dicache to do nothing on processors
  94  * with a coherent icache
  95  */
  96 static struct vdso_patch_def vdso_patches[] = {
  97         {
  98                 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
  99                 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
 100         },
 101 #ifdef CONFIG_PPC32
 102         {
 103                 CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 104                 "__kernel_gettimeofday", NULL
 105         },
 106         {
 107                 CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 108                 "__kernel_clock_gettime", NULL
 109         },
 110         {
 111                 CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 112                 "__kernel_clock_getres", NULL
 113         },
 114         {
 115                 CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 116                 "__kernel_get_tbfreq", NULL
 117         },
 118         {
 119                 CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 120                 "__kernel_time", NULL
 121         },
 122 #endif
 123 };
 124
 125 /*
 126  * Some infos carried around for each of them during parsing at
 127  * boot time.
 128  */
 129 struct lib32_elfinfo
 130 {
 131         Elf32_Ehdr      *hdr;           /* ptr to ELF */
 132         Elf32_Sym       *dynsym;        /* ptr to .dynsym section */
 133         unsigned long   dynsymsize;     /* size of .dynsym section */
 134         char            *dynstr;        /* ptr to .dynstr section */
 135         unsigned long   text;           /* offset of .text section in .so */
 136 };
 137
 138 struct lib64_elfinfo
 139 {
 140         Elf64_Ehdr      *hdr;
 141         Elf64_Sym       *dynsym;
 142         unsigned long   dynsymsize;
 143         char            *dynstr;
 144         unsigned long   text;
 145 };
 146
 147
 148 /*
 149  * This is called from binfmt_elf, we create the special vma for the
 150  * vDSO and insert it into the mm struct tree
 151  */
 152 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 153 {
 154         struct mm_struct *mm = current->mm;
 155         struct page **vdso_pagelist;
 156         unsigned long vdso_pages;
 157         unsigned long vdso_base;
 158         int rc;
 159
 160         if (!vdso_ready)
 161                 return 0;
 162
 163 #ifdef CONFIG_PPC64
 164         if (is_32bit_task()) {
 165                 vdso_pagelist = vdso32_pagelist;
 166                 vdso_pages = vdso32_pages;
 167                 vdso_base = VDSO32_MBASE;
 168         } else {
 169                 vdso_pagelist = vdso64_pagelist;
 170                 vdso_pages = vdso64_pages;
 171                 /*
 172                  * On 64bit we don't have a preferred map address. This
 173                  * allows get_unmapped_area to find an area near other mmaps
 174                  * and most likely share a SLB entry.
 175                  */
 176                 vdso_base = 0;
 177         }
 178 #else
 179         vdso_pagelist = vdso32_pagelist;
 180         vdso_pages = vdso32_pages;
 181         vdso_base = VDSO32_MBASE;
 182 #endif
 183
 184         current->mm->context.vdso_base = 0;
 185
 186         /* vDSO has a problem and was disabled, just don't "enable" it for the
 187          * process
 188          */
 189         if (vdso_pages == 0)
 190                 return 0;
 191         /* Add a page to the vdso size for the data page */
 192         vdso_pages ++;
 193
 194         /*
 195          * pick a base address for the vDSO in process space. We try to put it
 196          * at vdso_base which is the "natural" base for it, but we might fail
 197          * and end up putting it elsewhere.
 198          * Add enough to the size so that the result can be aligned.
 199          */
 200         if (down_write_killable(&mm->mmap_sem))
 201                 return -EINTR;
 202         vdso_base = get_unmapped_area(NULL, vdso_base,
 203                                       (vdso_pages << PAGE_SHIFT) +
 204                                       ((VDSO_ALIGNMENT - 1) & PAGE_MASK),
 205                                       0, 0);
 206         if (IS_ERR_VALUE(vdso_base)) {
 207                 rc = vdso_base;
 208                 goto fail_mmapsem;
 209         }
 210
 211         /* Add required alignment. */
 212         vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT);
 213
 214         /*
 215          * Put vDSO base into mm struct. We need to do this before calling
 216          * install_special_mapping or the perf counter mmap tracking code
 217          * will fail to recognise it as a vDSO (since arch_vma_name fails).
 218          */
 219         current->mm->context.vdso_base = vdso_base;
 220
 221         /*
 222          * our vma flags don't have VM_WRITE so by default, the process isn't
 223          * allowed to write those pages.
 224          * gdb can break that with ptrace interface, and thus trigger COW on
 225          * those pages but it's then your responsibility to never do that on
 226          * the "data" page of the vDSO or you'll stop getting kernel updates
 227          * and your nice userland gettimeofday will be totally dead.
 228          * It's fine to use that for setting breakpoints in the vDSO code
 229          * pages though.
 230          */
 231         rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
 232                                      VM_READ|VM_EXEC|
 233                                      VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
 234                                      vdso_pagelist);
 235         if (rc) {
 236                 current->mm->context.vdso_base = 0;
 237                 goto fail_mmapsem;
 238         }
 239
 240         up_write(&mm->mmap_sem);
 241         return 0;
 242
 243  fail_mmapsem:
 244         up_write(&mm->mmap_sem);
 245         return rc;
 246 }
 247
 248 const char *arch_vma_name(struct vm_area_struct *vma)
 249 {
 250         if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
 251                 return "[vdso]";
 252         return NULL;
 253 }
 254
 255
 256
 257 #ifdef CONFIG_VDSO32
 258 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
 259                                   unsigned long *size)
 260 {
 261         Elf32_Shdr *sechdrs;
 262         unsigned int i;
 263         char *secnames;
 264
 265         /* Grab section headers and strings so we can tell who is who */
 266         sechdrs = (void *)ehdr + ehdr->e_shoff;
 267         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
 268
 269         /* Find the section they want */
 270         for (i = 1; i < ehdr->e_shnum; i++) {
 271                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
 272                         if (size)
 273                                 *size = sechdrs[i].sh_size;
 274                         return (void *)ehdr + sechdrs[i].sh_offset;
 275                 }
 276         }
 277         *size = 0;
 278         return NULL;
 279 }
 280
 281 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
 282                                         const char *symname)
 283 {
 284         unsigned int i;
 285         char name[MAX_SYMNAME], *c;
 286
 287         for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
 288                 if (lib->dynsym[i].st_name == 0)
 289                         continue;
 290                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
 291                         MAX_SYMNAME);
 292                 c = strchr(name, '@');
 293                 if (c)
 294                         *c = 0;
 295                 if (strcmp(symname, name) == 0)
 296                         return &lib->dynsym[i];
 297         }
 298         return NULL;
 299 }
 300
 301 /* Note that we assume the section is .text and the symbol is relative to
 302  * the library base
 303  */
 304 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
 305                                             const char *symname)
 306 {
 307         Elf32_Sym *sym = find_symbol32(lib, symname);
 308
 309         if (sym == NULL) {
 310                 printk(KERN_WARNING "vDSO32: function %s not found !\n",
 311                        symname);
 312                 return 0;
 313         }
 314         return sym->st_value - VDSO32_LBASE;
 315 }
 316
 317 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
 318                                        struct lib64_elfinfo *v64,
 319                                        const char *orig, const char *fix)
 320 {
 321         Elf32_Sym *sym32_gen, *sym32_fix;
 322
 323         sym32_gen = find_symbol32(v32, orig);
 324         if (sym32_gen == NULL) {
 325                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
 326                 return -1;
 327         }
 328         if (fix == NULL) {
 329                 sym32_gen->st_name = 0;
 330                 return 0;
 331         }
 332         sym32_fix = find_symbol32(v32, fix);
 333         if (sym32_fix == NULL) {
 334                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
 335                 return -1;
 336         }
 337         sym32_gen->st_value = sym32_fix->st_value;
 338         sym32_gen->st_size = sym32_fix->st_size;
 339         sym32_gen->st_info = sym32_fix->st_info;
 340         sym32_gen->st_other = sym32_fix->st_other;
 341         sym32_gen->st_shndx = sym32_fix->st_shndx;
 342
 343         return 0;
 344 }
 345 #else /* !CONFIG_VDSO32 */
 346 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
 347                                             const char *symname)
 348 {
 349         return 0;
 350 }
 351
 352 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
 353                                        struct lib64_elfinfo *v64,
 354                                        const char *orig, const char *fix)
 355 {
 356         return 0;
 357 }
 358 #endif /* CONFIG_VDSO32 */
 359
 360
 361 #ifdef CONFIG_PPC64
 362
 363 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
 364                                   unsigned long *size)
 365 {
 366         Elf64_Shdr *sechdrs;
 367         unsigned int i;
 368         char *secnames;
 369
 370         /* Grab section headers and strings so we can tell who is who */
 371         sechdrs = (void *)ehdr + ehdr->e_shoff;
 372         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
 373
 374         /* Find the section they want */
 375         for (i = 1; i < ehdr->e_shnum; i++) {
 376                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
 377                         if (size)
 378                                 *size = sechdrs[i].sh_size;
 379                         return (void *)ehdr + sechdrs[i].sh_offset;
 380                 }
 381         }
 382         if (size)
 383                 *size = 0;
 384         return NULL;
 385 }
 386
 387 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
 388                                         const char *symname)
 389 {
 390         unsigned int i;
 391         char name[MAX_SYMNAME], *c;
 392
 393         for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
 394                 if (lib->dynsym[i].st_name == 0)
 395                         continue;
 396                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
 397                         MAX_SYMNAME);
 398                 c = strchr(name, '@');
 399                 if (c)
 400                         *c = 0;
 401                 if (strcmp(symname, name) == 0)
 402                         return &lib->dynsym[i];
 403         }
 404         return NULL;
 405 }
 406
 407 /* Note that we assume the section is .text and the symbol is relative to
 408  * the library base
 409  */
 410 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
 411                                             const char *symname)
 412 {
 413         Elf64_Sym *sym = find_symbol64(lib, symname);
 414
 415         if (sym == NULL) {
 416                 printk(KERN_WARNING "vDSO64: function %s not found !\n",
 417                        symname);
 418                 return 0;
 419         }
 420 #ifdef VDS64_HAS_DESCRIPTORS
 421         return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
 422                 VDSO64_LBASE;
 423 #else
 424         return sym->st_value - VDSO64_LBASE;
 425 #endif
 426 }
 427
 428 static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32,
 429                                        struct lib64_elfinfo *v64,
 430                                        const char *orig, const char *fix)
 431 {
 432         Elf64_Sym *sym64_gen, *sym64_fix;
 433
 434         sym64_gen = find_symbol64(v64, orig);
 435         if (sym64_gen == NULL) {
 436                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
 437                 return -1;
 438         }
 439         if (fix == NULL) {
 440                 sym64_gen->st_name = 0;
 441                 return 0;
 442         }
 443         sym64_fix = find_symbol64(v64, fix);
 444         if (sym64_fix == NULL) {
 445                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
 446                 return -1;
 447         }
 448         sym64_gen->st_value = sym64_fix->st_value;
 449         sym64_gen->st_size = sym64_fix->st_size;
 450         sym64_gen->st_info = sym64_fix->st_info;
 451         sym64_gen->st_other = sym64_fix->st_other;
 452         sym64_gen->st_shndx = sym64_fix->st_shndx;
 453
 454         return 0;
 455 }
 456
 457 #endif /* CONFIG_PPC64 */
 458
 459
 460 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
 461                                         struct lib64_elfinfo *v64)
 462 {
 463         void *sect;
 464
 465         /*
 466          * Locate symbol tables & text section
 467          */
 468
 469 #ifdef CONFIG_VDSO32
 470         v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
 471         v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
 472         if (v32->dynsym == NULL || v32->dynstr == NULL) {
 473                 printk(KERN_ERR "vDSO32: required symbol section not found\n");
 474                 return -1;
 475         }
 476         sect = find_section32(v32->hdr, ".text", NULL);
 477         if (sect == NULL) {
 478                 printk(KERN_ERR "vDSO32: the .text section was not found\n");
 479                 return -1;
 480         }
 481         v32->text = sect - vdso32_kbase;
 482 #endif
 483
 484 #ifdef CONFIG_PPC64
 485         v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
 486         v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
 487         if (v64->dynsym == NULL || v64->dynstr == NULL) {
 488                 printk(KERN_ERR "vDSO64: required symbol section not found\n");
 489                 return -1;
 490         }
 491         sect = find_section64(v64->hdr, ".text", NULL);
 492         if (sect == NULL) {
 493                 printk(KERN_ERR "vDSO64: the .text section was not found\n");
 494                 return -1;
 495         }
 496         v64->text = sect - vdso64_kbase;
 497 #endif /* CONFIG_PPC64 */
 498
 499         return 0;
 500 }
 501
 502 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
 503                                           struct lib64_elfinfo *v64)
 504 {
 505         /*
 506          * Find signal trampolines
 507          */
 508
 509 #ifdef CONFIG_PPC64
 510         vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
 511 #endif
 512         vdso32_sigtramp    = find_function32(v32, "__kernel_sigtramp32");
 513         vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
 514 }
 515
 516 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
 517                                        struct lib64_elfinfo *v64)
 518 {
 519 #ifdef CONFIG_VDSO32
 520         Elf32_Sym *sym32;
 521 #endif
 522 #ifdef CONFIG_PPC64
 523         Elf64_Sym *sym64;
 524
 525         sym64 = find_symbol64(v64, "__kernel_datapage_offset");
 526         if (sym64 == NULL) {
 527                 printk(KERN_ERR "vDSO64: Can't find symbol "
 528                        "__kernel_datapage_offset !\n");
 529                 return -1;
 530         }
 531         *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
 532                 (vdso64_pages << PAGE_SHIFT) -
 533                 (sym64->st_value - VDSO64_LBASE);
 534 #endif /* CONFIG_PPC64 */
 535
 536 #ifdef CONFIG_VDSO32
 537         sym32 = find_symbol32(v32, "__kernel_datapage_offset");
 538         if (sym32 == NULL) {
 539                 printk(KERN_ERR "vDSO32: Can't find symbol "
 540                        "__kernel_datapage_offset !\n");
 541                 return -1;
 542         }
 543         *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
 544                 (vdso32_pages << PAGE_SHIFT) -
 545                 (sym32->st_value - VDSO32_LBASE);
 546 #endif
 547
 548         return 0;
 549 }
 550
 551
 552 static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
 553                                       struct lib64_elfinfo *v64)
 554 {
 555         unsigned long size;
 556         void *start;
 557
 558 #ifdef CONFIG_PPC64
 559         start = find_section64(v64->hdr, "__ftr_fixup", &size);
 560         if (start)
 561                 do_feature_fixups(cur_cpu_spec->cpu_features,
 562                                   start, start + size);
 563
 564         start = find_section64(v64->hdr, "__mmu_ftr_fixup", &size);
 565         if (start)
 566                 do_feature_fixups(cur_cpu_spec->mmu_features,
 567                                   start, start + size);
 568
 569         start = find_section64(v64->hdr, "__fw_ftr_fixup", &size);
 570         if (start)
 571                 do_feature_fixups(powerpc_firmware_features,
 572                                   start, start + size);
 573
 574         start = find_section64(v64->hdr, "__lwsync_fixup", &size);
 575         if (start)
 576                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
 577                                  start, start + size);
 578 #endif /* CONFIG_PPC64 */
 579
 580 #ifdef CONFIG_VDSO32
 581         start = find_section32(v32->hdr, "__ftr_fixup", &size);
 582         if (start)
 583                 do_feature_fixups(cur_cpu_spec->cpu_features,
 584                                   start, start + size);
 585
 586         start = find_section32(v32->hdr, "__mmu_ftr_fixup", &size);
 587         if (start)
 588                 do_feature_fixups(cur_cpu_spec->mmu_features,
 589                                   start, start + size);
 590
 591 #ifdef CONFIG_PPC64
 592         start = find_section32(v32->hdr, "__fw_ftr_fixup", &size);
 593         if (start)
 594                 do_feature_fixups(powerpc_firmware_features,
 595                                   start, start + size);
 596 #endif /* CONFIG_PPC64 */
 597
 598         start = find_section32(v32->hdr, "__lwsync_fixup", &size);
 599         if (start)
 600                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
 601                                  start, start + size);
 602 #endif
 603
 604         return 0;
 605 }
 606
 607 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
 608                                        struct lib64_elfinfo *v64)
 609 {
 610         int i;
 611
 612         for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
 613                 struct vdso_patch_def *patch = &vdso_patches[i];
 614                 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
 615                         == patch->ftr_value;
 616                 if (!match)
 617                         continue;
 618
 619                 DBG("replacing %s with %s...\n", patch->gen_name,
 620                     patch->fix_name ? "NONE" : patch->fix_name);
 621
 622                 /*
 623                  * Patch the 32 bits and 64 bits symbols. Note that we do not
 624                  * patch the "." symbol on 64 bits.
 625                  * It would be easy to do, but doesn't seem to be necessary,
 626                  * patching the OPD symbol is enough.
 627                  */
 628                 vdso_do_func_patch32(v32, v64, patch->gen_name,
 629                                      patch->fix_name);
 630 #ifdef CONFIG_PPC64
 631                 vdso_do_func_patch64(v32, v64, patch->gen_name,
 632                                      patch->fix_name);
 633 #endif /* CONFIG_PPC64 */
 634         }
 635
 636         return 0;
 637 }
 638
 639
 640 static __init int vdso_setup(void)
 641 {
 642         struct lib32_elfinfo    v32;
 643         struct lib64_elfinfo    v64;
 644
 645         v32.hdr = vdso32_kbase;
 646 #ifdef CONFIG_PPC64
 647         v64.hdr = vdso64_kbase;
 648 #endif
 649         if (vdso_do_find_sections(&v32, &v64))
 650                 return -1;
 651
 652         if (vdso_fixup_datapage(&v32, &v64))
 653                 return -1;
 654
 655         if (vdso_fixup_features(&v32, &v64))
 656                 return -1;
 657
 658         if (vdso_fixup_alt_funcs(&v32, &v64))
 659                 return -1;
 660
 661         vdso_setup_trampolines(&v32, &v64);
 662
 663         return 0;
 664 }
 665
 666 /*
 667  * Called from setup_arch to initialize the bitmap of available
 668  * syscalls in the systemcfg page
 669  */
 670 static void __init vdso_setup_syscall_map(void)
 671 {
 672         unsigned int i;
 673         extern unsigned long *sys_call_table;
 674         extern unsigned long sys_ni_syscall;
 675
 676
 677         for (i = 0; i < NR_syscalls; i++) {
 678 #ifdef CONFIG_PPC64
 679                 if (sys_call_table[i*2] != sys_ni_syscall)
 680                         vdso_data->syscall_map_64[i >> 5] |=
 681                                 0x80000000UL >> (i & 0x1f);
 682                 if (sys_call_table[i*2+1] != sys_ni_syscall)
 683                         vdso_data->syscall_map_32[i >> 5] |=
 684                                 0x80000000UL >> (i & 0x1f);
 685 #else /* CONFIG_PPC64 */
 686                 if (sys_call_table[i] != sys_ni_syscall)
 687                         vdso_data->syscall_map_32[i >> 5] |=
 688                                 0x80000000UL >> (i & 0x1f);
 689 #endif /* CONFIG_PPC64 */
 690         }
 691 }
 692
 693 #ifdef CONFIG_PPC64
 694 int vdso_getcpu_init(void)
 695 {
 696         unsigned long cpu, node, val;
 697
 698         /*
 699          * SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node
 700          * in the next 16 bits.  The VDSO uses this to implement getcpu().
 701          */
 702         cpu = get_cpu();
 703         WARN_ON_ONCE(cpu > 0xffff);
 704
 705         node = cpu_to_node(cpu);
 706         WARN_ON_ONCE(node > 0xffff);
 707
 708         val = (cpu & 0xffff) | ((node & 0xffff) << 16);
 709         mtspr(SPRN_SPRG_VDSO_WRITE, val);
 710         get_paca()->sprg_vdso = val;
 711
 712         put_cpu();
 713
 714         return 0;
 715 }
 716 /* We need to call this before SMP init */
 717 early_initcall(vdso_getcpu_init);
 718 #endif
 719
 720 static int __init vdso_init(void)
 721 {
 722         int i;
 723
 724 #ifdef CONFIG_PPC64
 725         /*
 726          * Fill up the "systemcfg" stuff for backward compatibility
 727          */
 728         strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
 729         vdso_data->version.major = SYSTEMCFG_MAJOR;
 730         vdso_data->version.minor = SYSTEMCFG_MINOR;
 731         vdso_data->processor = mfspr(SPRN_PVR);
 732         /*
 733          * Fake the old platform number for pSeries and add
 734          * in LPAR bit if necessary
 735          */
 736         vdso_data->platform = 0x100;
 737         if (firmware_has_feature(FW_FEATURE_LPAR))
 738                 vdso_data->platform |= 1;
 739         vdso_data->physicalMemorySize = memblock_phys_mem_size();
 740         vdso_data->dcache_size = ppc64_caches.l1d.size;
 741         vdso_data->dcache_line_size = ppc64_caches.l1d.line_size;
 742         vdso_data->icache_size = ppc64_caches.l1i.size;
 743         vdso_data->icache_line_size = ppc64_caches.l1i.line_size;
 744         vdso_data->dcache_block_size = ppc64_caches.l1d.block_size;
 745         vdso_data->icache_block_size = ppc64_caches.l1i.block_size;
 746         vdso_data->dcache_log_block_size = ppc64_caches.l1d.log_block_size;
 747         vdso_data->icache_log_block_size = ppc64_caches.l1i.log_block_size;
 748
 749         /*
 750          * Calculate the size of the 64 bits vDSO
 751          */
 752         vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
 753         DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
 754 #else
 755         vdso_data->dcache_block_size = L1_CACHE_BYTES;
 756         vdso_data->dcache_log_block_size = L1_CACHE_SHIFT;
 757         vdso_data->icache_block_size = L1_CACHE_BYTES;
 758         vdso_data->icache_log_block_size = L1_CACHE_SHIFT;
 759 #endif /* CONFIG_PPC64 */
 760
 761
 762 #ifdef CONFIG_VDSO32
 763         vdso32_kbase = &vdso32_start;
 764
 765         /*
 766          * Calculate the size of the 32 bits vDSO
 767          */
 768         vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
 769         DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
 770 #endif
 771
 772
 773         /*
 774          * Setup the syscall map in the vDOS
 775          */
 776         vdso_setup_syscall_map();
 777
 778         /*
 779          * Initialize the vDSO images in memory, that is do necessary
 780          * fixups of vDSO symbols, locate trampolines, etc...
 781          */
 782         if (vdso_setup()) {
 783                 printk(KERN_ERR "vDSO setup failure, not enabled !\n");
 784                 vdso32_pages = 0;
 785 #ifdef CONFIG_PPC64
 786                 vdso64_pages = 0;
 787 #endif
 788                 return 0;
 789         }
 790
 791 #ifdef CONFIG_VDSO32
 792         /* Make sure pages are in the correct state */
 793         vdso32_pagelist = kcalloc(vdso32_pages + 2, sizeof(struct page *),
 794                                   GFP_KERNEL);
 795         BUG_ON(vdso32_pagelist == NULL);
 796         for (i = 0; i < vdso32_pages; i++) {
 797                 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
 798                 ClearPageReserved(pg);
 799                 get_page(pg);
 800                 vdso32_pagelist[i] = pg;
 801         }
 802         vdso32_pagelist[i++] = virt_to_page(vdso_data);
 803         vdso32_pagelist[i] = NULL;
 804 #endif
 805
 806 #ifdef CONFIG_PPC64
 807         vdso64_pagelist = kcalloc(vdso64_pages + 2, sizeof(struct page *),
 808                                   GFP_KERNEL);
 809         BUG_ON(vdso64_pagelist == NULL);
 810         for (i = 0; i < vdso64_pages; i++) {
 811                 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
 812                 ClearPageReserved(pg);
 813                 get_page(pg);
 814                 vdso64_pagelist[i] = pg;
 815         }
 816         vdso64_pagelist[i++] = virt_to_page(vdso_data);
 817         vdso64_pagelist[i] = NULL;
 818 #endif /* CONFIG_PPC64 */
 819
 820         get_page(virt_to_page(vdso_data));
 821
 822         smp_wmb();
 823         vdso_ready = 1;
 824
 825         return 0;
 826 }
 827 arch_initcall(vdso_init);