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         {
 102                 CPU_FTR_USE_TB, 0,
 103                 "__kernel_gettimeofday", NULL
 104         },
 105         {
 106                 CPU_FTR_USE_TB, 0,
 107                 "__kernel_clock_gettime", NULL
 108         },
 109         {
 110                 CPU_FTR_USE_TB, 0,
 111                 "__kernel_clock_getres", NULL
 112         },
 113         {
 114                 CPU_FTR_USE_TB, 0,
 115                 "__kernel_get_tbfreq", NULL
 116         },
 117         {
 118                 CPU_FTR_USE_TB, 0,
 119                 "__kernel_time", NULL
 120         },
 121 };
 122
 123 /*
 124  * Some infos carried around for each of them during parsing at
 125  * boot time.
 126  */
 127 struct lib32_elfinfo
 128 {
 129         Elf32_Ehdr      *hdr;           /* ptr to ELF */
 130         Elf32_Sym       *dynsym;        /* ptr to .dynsym section */
 131         unsigned long   dynsymsize;     /* size of .dynsym section */
 132         char            *dynstr;        /* ptr to .dynstr section */
 133         unsigned long   text;           /* offset of .text section in .so */
 134 };
 135
 136 struct lib64_elfinfo
 137 {
 138         Elf64_Ehdr      *hdr;
 139         Elf64_Sym       *dynsym;
 140         unsigned long   dynsymsize;
 141         char            *dynstr;
 142         unsigned long   text;
 143 };
 144
 145
 146 /*
 147  * This is called from binfmt_elf, we create the special vma for the
 148  * vDSO and insert it into the mm struct tree
 149  */
 150 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 151 {
 152         struct mm_struct *mm = current->mm;
 153         struct page **vdso_pagelist;
 154         unsigned long vdso_pages;
 155         unsigned long vdso_base;
 156         int rc;
 157
 158         if (!vdso_ready)
 159                 return 0;
 160
 161 #ifdef CONFIG_PPC64
 162         if (is_32bit_task()) {
 163                 vdso_pagelist = vdso32_pagelist;
 164                 vdso_pages = vdso32_pages;
 165                 vdso_base = VDSO32_MBASE;
 166         } else {
 167                 vdso_pagelist = vdso64_pagelist;
 168                 vdso_pages = vdso64_pages;
 169                 /*
 170                  * On 64bit we don't have a preferred map address. This
 171                  * allows get_unmapped_area to find an area near other mmaps
 172                  * and most likely share a SLB entry.
 173                  */
 174                 vdso_base = 0;
 175         }
 176 #else
 177         vdso_pagelist = vdso32_pagelist;
 178         vdso_pages = vdso32_pages;
 179         vdso_base = VDSO32_MBASE;
 180 #endif
 181
 182         current->mm->context.vdso_base = 0;
 183
 184         /* vDSO has a problem and was disabled, just don't "enable" it for the
 185          * process
 186          */
 187         if (vdso_pages == 0)
 188                 return 0;
 189         /* Add a page to the vdso size for the data page */
 190         vdso_pages ++;
 191
 192         /*
 193          * pick a base address for the vDSO in process space. We try to put it
 194          * at vdso_base which is the "natural" base for it, but we might fail
 195          * and end up putting it elsewhere.
 196          * Add enough to the size so that the result can be aligned.
 197          */
 198         if (down_write_killable(&mm->mmap_sem))
 199                 return -EINTR;
 200         vdso_base = get_unmapped_area(NULL, vdso_base,
 201                                       (vdso_pages << PAGE_SHIFT) +
 202                                       ((VDSO_ALIGNMENT - 1) & PAGE_MASK),
 203                                       0, 0);
 204         if (IS_ERR_VALUE(vdso_base)) {
 205                 rc = vdso_base;
 206                 goto fail_mmapsem;
 207         }
 208
 209         /* Add required alignment. */
 210         vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT);
 211
 212         /*
 213          * Put vDSO base into mm struct. We need to do this before calling
 214          * install_special_mapping or the perf counter mmap tracking code
 215          * will fail to recognise it as a vDSO (since arch_vma_name fails).
 216          */
 217         current->mm->context.vdso_base = vdso_base;
 218
 219         /*
 220          * our vma flags don't have VM_WRITE so by default, the process isn't
 221          * allowed to write those pages.
 222          * gdb can break that with ptrace interface, and thus trigger COW on
 223          * those pages but it's then your responsibility to never do that on
 224          * the "data" page of the vDSO or you'll stop getting kernel updates
 225          * and your nice userland gettimeofday will be totally dead.
 226          * It's fine to use that for setting breakpoints in the vDSO code
 227          * pages though.
 228          */
 229         rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
 230                                      VM_READ|VM_EXEC|
 231                                      VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
 232                                      vdso_pagelist);
 233         if (rc) {
 234                 current->mm->context.vdso_base = 0;
 235                 goto fail_mmapsem;
 236         }
 237
 238         up_write(&mm->mmap_sem);
 239         return 0;
 240
 241  fail_mmapsem:
 242         up_write(&mm->mmap_sem);
 243         return rc;
 244 }
 245
 246 const char *arch_vma_name(struct vm_area_struct *vma)
 247 {
 248         if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
 249                 return "[vdso]";
 250         return NULL;
 251 }
 252
 253
 254
 255 #ifdef CONFIG_VDSO32
 256 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
 257                                   unsigned long *size)
 258 {
 259         Elf32_Shdr *sechdrs;
 260         unsigned int i;
 261         char *secnames;
 262
 263         /* Grab section headers and strings so we can tell who is who */
 264         sechdrs = (void *)ehdr + ehdr->e_shoff;
 265         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
 266
 267         /* Find the section they want */
 268         for (i = 1; i < ehdr->e_shnum; i++) {
 269                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
 270                         if (size)
 271                                 *size = sechdrs[i].sh_size;
 272                         return (void *)ehdr + sechdrs[i].sh_offset;
 273                 }
 274         }
 275         *size = 0;
 276         return NULL;
 277 }
 278
 279 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
 280                                         const char *symname)
 281 {
 282         unsigned int i;
 283         char name[MAX_SYMNAME], *c;
 284
 285         for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
 286                 if (lib->dynsym[i].st_name == 0)
 287                         continue;
 288                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
 289                         MAX_SYMNAME);
 290                 c = strchr(name, '@');
 291                 if (c)
 292                         *c = 0;
 293                 if (strcmp(symname, name) == 0)
 294                         return &lib->dynsym[i];
 295         }
 296         return NULL;
 297 }
 298
 299 /* Note that we assume the section is .text and the symbol is relative to
 300  * the library base
 301  */
 302 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
 303                                             const char *symname)
 304 {
 305         Elf32_Sym *sym = find_symbol32(lib, symname);
 306
 307         if (sym == NULL) {
 308                 printk(KERN_WARNING "vDSO32: function %s not found !\n",
 309                        symname);
 310                 return 0;
 311         }
 312         return sym->st_value - VDSO32_LBASE;
 313 }
 314
 315 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
 316                                        struct lib64_elfinfo *v64,
 317                                        const char *orig, const char *fix)
 318 {
 319         Elf32_Sym *sym32_gen, *sym32_fix;
 320
 321         sym32_gen = find_symbol32(v32, orig);
 322         if (sym32_gen == NULL) {
 323                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
 324                 return -1;
 325         }
 326         if (fix == NULL) {
 327                 sym32_gen->st_name = 0;
 328                 return 0;
 329         }
 330         sym32_fix = find_symbol32(v32, fix);
 331         if (sym32_fix == NULL) {
 332                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
 333                 return -1;
 334         }
 335         sym32_gen->st_value = sym32_fix->st_value;
 336         sym32_gen->st_size = sym32_fix->st_size;
 337         sym32_gen->st_info = sym32_fix->st_info;
 338         sym32_gen->st_other = sym32_fix->st_other;
 339         sym32_gen->st_shndx = sym32_fix->st_shndx;
 340
 341         return 0;
 342 }
 343 #else /* !CONFIG_VDSO32 */
 344 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
 345                                             const char *symname)
 346 {
 347         return 0;
 348 }
 349
 350 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
 351                                        struct lib64_elfinfo *v64,
 352                                        const char *orig, const char *fix)
 353 {
 354         return 0;
 355 }
 356 #endif /* CONFIG_VDSO32 */
 357
 358
 359 #ifdef CONFIG_PPC64
 360
 361 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
 362                                   unsigned long *size)
 363 {
 364         Elf64_Shdr *sechdrs;
 365         unsigned int i;
 366         char *secnames;
 367
 368         /* Grab section headers and strings so we can tell who is who */
 369         sechdrs = (void *)ehdr + ehdr->e_shoff;
 370         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
 371
 372         /* Find the section they want */
 373         for (i = 1; i < ehdr->e_shnum; i++) {
 374                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
 375                         if (size)
 376                                 *size = sechdrs[i].sh_size;
 377                         return (void *)ehdr + sechdrs[i].sh_offset;
 378                 }
 379         }
 380         if (size)
 381                 *size = 0;
 382         return NULL;
 383 }
 384
 385 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
 386                                         const char *symname)
 387 {
 388         unsigned int i;
 389         char name[MAX_SYMNAME], *c;
 390
 391         for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
 392                 if (lib->dynsym[i].st_name == 0)
 393                         continue;
 394                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
 395                         MAX_SYMNAME);
 396                 c = strchr(name, '@');
 397                 if (c)
 398                         *c = 0;
 399                 if (strcmp(symname, name) == 0)
 400                         return &lib->dynsym[i];
 401         }
 402         return NULL;
 403 }
 404
 405 /* Note that we assume the section is .text and the symbol is relative to
 406  * the library base
 407  */
 408 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
 409                                             const char *symname)
 410 {
 411         Elf64_Sym *sym = find_symbol64(lib, symname);
 412
 413         if (sym == NULL) {
 414                 printk(KERN_WARNING "vDSO64: function %s not found !\n",
 415                        symname);
 416                 return 0;
 417         }
 418 #ifdef VDS64_HAS_DESCRIPTORS
 419         return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
 420                 VDSO64_LBASE;
 421 #else
 422         return sym->st_value - VDSO64_LBASE;
 423 #endif
 424 }
 425
 426 static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32,
 427                                        struct lib64_elfinfo *v64,
 428                                        const char *orig, const char *fix)
 429 {
 430         Elf64_Sym *sym64_gen, *sym64_fix;
 431
 432         sym64_gen = find_symbol64(v64, orig);
 433         if (sym64_gen == NULL) {
 434                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
 435                 return -1;
 436         }
 437         if (fix == NULL) {
 438                 sym64_gen->st_name = 0;
 439                 return 0;
 440         }
 441         sym64_fix = find_symbol64(v64, fix);
 442         if (sym64_fix == NULL) {
 443                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
 444                 return -1;
 445         }
 446         sym64_gen->st_value = sym64_fix->st_value;
 447         sym64_gen->st_size = sym64_fix->st_size;
 448         sym64_gen->st_info = sym64_fix->st_info;
 449         sym64_gen->st_other = sym64_fix->st_other;
 450         sym64_gen->st_shndx = sym64_fix->st_shndx;
 451
 452         return 0;
 453 }
 454
 455 #endif /* CONFIG_PPC64 */
 456
 457
 458 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
 459                                         struct lib64_elfinfo *v64)
 460 {
 461         void *sect;
 462
 463         /*
 464          * Locate symbol tables & text section
 465          */
 466
 467 #ifdef CONFIG_VDSO32
 468         v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
 469         v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
 470         if (v32->dynsym == NULL || v32->dynstr == NULL) {
 471                 printk(KERN_ERR "vDSO32: required symbol section not found\n");
 472                 return -1;
 473         }
 474         sect = find_section32(v32->hdr, ".text", NULL);
 475         if (sect == NULL) {
 476                 printk(KERN_ERR "vDSO32: the .text section was not found\n");
 477                 return -1;
 478         }
 479         v32->text = sect - vdso32_kbase;
 480 #endif
 481
 482 #ifdef CONFIG_PPC64
 483         v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
 484         v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
 485         if (v64->dynsym == NULL || v64->dynstr == NULL) {
 486                 printk(KERN_ERR "vDSO64: required symbol section not found\n");
 487                 return -1;
 488         }
 489         sect = find_section64(v64->hdr, ".text", NULL);
 490         if (sect == NULL) {
 491                 printk(KERN_ERR "vDSO64: the .text section was not found\n");
 492                 return -1;
 493         }
 494         v64->text = sect - vdso64_kbase;
 495 #endif /* CONFIG_PPC64 */
 496
 497         return 0;
 498 }
 499
 500 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
 501                                           struct lib64_elfinfo *v64)
 502 {
 503         /*
 504          * Find signal trampolines
 505          */
 506
 507 #ifdef CONFIG_PPC64
 508         vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
 509 #endif
 510         vdso32_sigtramp    = find_function32(v32, "__kernel_sigtramp32");
 511         vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
 512 }
 513
 514 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
 515                                        struct lib64_elfinfo *v64)
 516 {
 517 #ifdef CONFIG_VDSO32
 518         Elf32_Sym *sym32;
 519 #endif
 520 #ifdef CONFIG_PPC64
 521         Elf64_Sym *sym64;
 522
 523         sym64 = find_symbol64(v64, "__kernel_datapage_offset");
 524         if (sym64 == NULL) {
 525                 printk(KERN_ERR "vDSO64: Can't find symbol "
 526                        "__kernel_datapage_offset !\n");
 527                 return -1;
 528         }
 529         *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
 530                 (vdso64_pages << PAGE_SHIFT) -
 531                 (sym64->st_value - VDSO64_LBASE);
 532 #endif /* CONFIG_PPC64 */
 533
 534 #ifdef CONFIG_VDSO32
 535         sym32 = find_symbol32(v32, "__kernel_datapage_offset");
 536         if (sym32 == NULL) {
 537                 printk(KERN_ERR "vDSO32: Can't find symbol "
 538                        "__kernel_datapage_offset !\n");
 539                 return -1;
 540         }
 541         *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
 542                 (vdso32_pages << PAGE_SHIFT) -
 543                 (sym32->st_value - VDSO32_LBASE);
 544 #endif
 545
 546         return 0;
 547 }
 548
 549
 550 static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
 551                                       struct lib64_elfinfo *v64)
 552 {
 553         unsigned long size;
 554         void *start;
 555
 556 #ifdef CONFIG_PPC64
 557         start = find_section64(v64->hdr, "__ftr_fixup", &size);
 558         if (start)
 559                 do_feature_fixups(cur_cpu_spec->cpu_features,
 560                                   start, start + size);
 561
 562         start = find_section64(v64->hdr, "__mmu_ftr_fixup", &size);
 563         if (start)
 564                 do_feature_fixups(cur_cpu_spec->mmu_features,
 565                                   start, start + size);
 566
 567         start = find_section64(v64->hdr, "__fw_ftr_fixup", &size);
 568         if (start)
 569                 do_feature_fixups(powerpc_firmware_features,
 570                                   start, start + size);
 571
 572         start = find_section64(v64->hdr, "__lwsync_fixup", &size);
 573         if (start)
 574                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
 575                                  start, start + size);
 576 #endif /* CONFIG_PPC64 */
 577
 578 #ifdef CONFIG_VDSO32
 579         start = find_section32(v32->hdr, "__ftr_fixup", &size);
 580         if (start)
 581                 do_feature_fixups(cur_cpu_spec->cpu_features,
 582                                   start, start + size);
 583
 584         start = find_section32(v32->hdr, "__mmu_ftr_fixup", &size);
 585         if (start)
 586                 do_feature_fixups(cur_cpu_spec->mmu_features,
 587                                   start, start + size);
 588
 589 #ifdef CONFIG_PPC64
 590         start = find_section32(v32->hdr, "__fw_ftr_fixup", &size);
 591         if (start)
 592                 do_feature_fixups(powerpc_firmware_features,
 593                                   start, start + size);
 594 #endif /* CONFIG_PPC64 */
 595
 596         start = find_section32(v32->hdr, "__lwsync_fixup", &size);
 597         if (start)
 598                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
 599                                  start, start + size);
 600 #endif
 601
 602         return 0;
 603 }
 604
 605 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
 606                                        struct lib64_elfinfo *v64)
 607 {
 608         int i;
 609
 610         for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
 611                 struct vdso_patch_def *patch = &vdso_patches[i];
 612                 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
 613                         == patch->ftr_value;
 614                 if (!match)
 615                         continue;
 616
 617                 DBG("replacing %s with %s...\n", patch->gen_name,
 618                     patch->fix_name ? "NONE" : patch->fix_name);
 619
 620                 /*
 621                  * Patch the 32 bits and 64 bits symbols. Note that we do not
 622                  * patch the "." symbol on 64 bits.
 623                  * It would be easy to do, but doesn't seem to be necessary,
 624                  * patching the OPD symbol is enough.
 625                  */
 626                 vdso_do_func_patch32(v32, v64, patch->gen_name,
 627                                      patch->fix_name);
 628 #ifdef CONFIG_PPC64
 629                 vdso_do_func_patch64(v32, v64, patch->gen_name,
 630                                      patch->fix_name);
 631 #endif /* CONFIG_PPC64 */
 632         }
 633
 634         return 0;
 635 }
 636
 637
 638 static __init int vdso_setup(void)
 639 {
 640         struct lib32_elfinfo    v32;
 641         struct lib64_elfinfo    v64;
 642
 643         v32.hdr = vdso32_kbase;
 644 #ifdef CONFIG_PPC64
 645         v64.hdr = vdso64_kbase;
 646 #endif
 647         if (vdso_do_find_sections(&v32, &v64))
 648                 return -1;
 649
 650         if (vdso_fixup_datapage(&v32, &v64))
 651                 return -1;
 652
 653         if (vdso_fixup_features(&v32, &v64))
 654                 return -1;
 655
 656         if (vdso_fixup_alt_funcs(&v32, &v64))
 657                 return -1;
 658
 659         vdso_setup_trampolines(&v32, &v64);
 660
 661         return 0;
 662 }
 663
 664 /*
 665  * Called from setup_arch to initialize the bitmap of available
 666  * syscalls in the systemcfg page
 667  */
 668 static void __init vdso_setup_syscall_map(void)
 669 {
 670         unsigned int i;
 671         extern unsigned long *sys_call_table;
 672         extern unsigned long sys_ni_syscall;
 673
 674
 675         for (i = 0; i < NR_syscalls; i++) {
 676 #ifdef CONFIG_PPC64
 677                 if (sys_call_table[i*2] != sys_ni_syscall)
 678                         vdso_data->syscall_map_64[i >> 5] |=
 679                                 0x80000000UL >> (i & 0x1f);
 680                 if (sys_call_table[i*2+1] != sys_ni_syscall)
 681                         vdso_data->syscall_map_32[i >> 5] |=
 682                                 0x80000000UL >> (i & 0x1f);
 683 #else /* CONFIG_PPC64 */
 684                 if (sys_call_table[i] != sys_ni_syscall)
 685                         vdso_data->syscall_map_32[i >> 5] |=
 686                                 0x80000000UL >> (i & 0x1f);
 687 #endif /* CONFIG_PPC64 */
 688         }
 689 }
 690
 691 #ifdef CONFIG_PPC64
 692 int vdso_getcpu_init(void)
 693 {
 694         unsigned long cpu, node, val;
 695
 696         /*
 697          * SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node
 698          * in the next 16 bits.  The VDSO uses this to implement getcpu().
 699          */
 700         cpu = get_cpu();
 701         WARN_ON_ONCE(cpu > 0xffff);
 702
 703         node = cpu_to_node(cpu);
 704         WARN_ON_ONCE(node > 0xffff);
 705
 706         val = (cpu & 0xfff) | ((node & 0xffff) << 16);
 707         mtspr(SPRN_SPRG_VDSO_WRITE, val);
 708         get_paca()->sprg_vdso = val;
 709
 710         put_cpu();
 711
 712         return 0;
 713 }
 714 /* We need to call this before SMP init */
 715 early_initcall(vdso_getcpu_init);
 716 #endif
 717
 718 static int __init vdso_init(void)
 719 {
 720         int i;
 721
 722 #ifdef CONFIG_PPC64
 723         /*
 724          * Fill up the "systemcfg" stuff for backward compatibility
 725          */
 726         strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
 727         vdso_data->version.major = SYSTEMCFG_MAJOR;
 728         vdso_data->version.minor = SYSTEMCFG_MINOR;
 729         vdso_data->processor = mfspr(SPRN_PVR);
 730         /*
 731          * Fake the old platform number for pSeries and add
 732          * in LPAR bit if necessary
 733          */
 734         vdso_data->platform = 0x100;
 735         if (firmware_has_feature(FW_FEATURE_LPAR))
 736                 vdso_data->platform |= 1;
 737         vdso_data->physicalMemorySize = memblock_phys_mem_size();
 738         vdso_data->dcache_size = ppc64_caches.dsize;
 739         vdso_data->dcache_line_size = ppc64_caches.dline_size;
 740         vdso_data->icache_size = ppc64_caches.isize;
 741         vdso_data->icache_line_size = ppc64_caches.iline_size;
 742
 743         /* XXXOJN: Blocks should be added to ppc64_caches and used instead */
 744         vdso_data->dcache_block_size = ppc64_caches.dline_size;
 745         vdso_data->icache_block_size = ppc64_caches.iline_size;
 746         vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size;
 747         vdso_data->icache_log_block_size = ppc64_caches.log_iline_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 = kzalloc(sizeof(struct page *) * (vdso32_pages + 2),
 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 = kzalloc(sizeof(struct page *) * (vdso64_pages + 2),
 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);