arch/powerpc/kernel/vdso.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /*
   4  *    Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
   5  *                       <benh@kernel.crashing.org>
   6  */
   7
   8 #include <linux/errno.h>
   9 #include <linux/sched.h>
  10 #include <linux/kernel.h>
  11 #include <linux/mm.h>
  12 #include <linux/smp.h>
  13 #include <linux/stddef.h>
  14 #include <linux/unistd.h>
  15 #include <linux/slab.h>
  16 #include <linux/user.h>
  17 #include <linux/elf.h>
  18 #include <linux/security.h>
  19 #include <linux/memblock.h>
  20
  21 #include <asm/processor.h>
  22 #include <asm/mmu.h>
  23 #include <asm/mmu_context.h>
  24 #include <asm/prom.h>
  25 #include <asm/machdep.h>
  26 #include <asm/cputable.h>
  27 #include <asm/sections.h>
  28 #include <asm/firmware.h>
  29 #include <asm/vdso.h>
  30 #include <asm/vdso_datapage.h>
  31 #include <asm/setup.h>
  32
  33 #undef DEBUG
  34
  35 #ifdef DEBUG
  36 #define DBG(fmt...) printk(fmt)
  37 #else
  38 #define DBG(fmt...)
  39 #endif
  40
  41 /* Max supported size for symbol names */
  42 #define MAX_SYMNAME     64
  43
  44 /* The alignment of the vDSO */
  45 #define VDSO_ALIGNMENT  (1 << 16)
  46
  47 static unsigned int vdso32_pages;
  48 static void *vdso32_kbase;
  49 static struct page **vdso32_pagelist;
  50 unsigned long vdso32_sigtramp;
  51 unsigned long vdso32_rt_sigtramp;
  52
  53 #ifdef CONFIG_VDSO32
  54 extern char vdso32_start, vdso32_end;
  55 #endif
  56
  57 #ifdef CONFIG_PPC64
  58 extern char vdso64_start, vdso64_end;
  59 static void *vdso64_kbase = &vdso64_start;
  60 static unsigned int vdso64_pages;
  61 static struct page **vdso64_pagelist;
  62 unsigned long vdso64_rt_sigtramp;
  63 #endif /* CONFIG_PPC64 */
  64
  65 static int vdso_ready;
  66
  67 /*
  68  * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
  69  * Once the early boot kernel code no longer needs to muck around
  70  * with it, it will become dynamically allocated
  71  */
  72 static union {
  73         struct vdso_data        data;
  74         u8                      page[PAGE_SIZE];
  75 } vdso_data_store __page_aligned_data;
  76 struct vdso_data *vdso_data = &vdso_data_store.data;
  77
  78 /* Format of the patch table */
  79 struct vdso_patch_def
  80 {
  81         unsigned long   ftr_mask, ftr_value;
  82         const char      *gen_name;
  83         const char      *fix_name;
  84 };
  85
  86 /* Table of functions to patch based on the CPU type/revision
  87  *
  88  * Currently, we only change sync_dicache to do nothing on processors
  89  * with a coherent icache
  90  */
  91 static struct vdso_patch_def vdso_patches[] = {
  92         {
  93                 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
  94                 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
  95         },
  96 };
  97
  98 /*
  99  * Some infos carried around for each of them during parsing at
 100  * boot time.
 101  */
 102 struct lib32_elfinfo
 103 {
 104         Elf32_Ehdr      *hdr;           /* ptr to ELF */
 105         Elf32_Sym       *dynsym;        /* ptr to .dynsym section */
 106         unsigned long   dynsymsize;     /* size of .dynsym section */
 107         char            *dynstr;        /* ptr to .dynstr section */
 108         unsigned long   text;           /* offset of .text section in .so */
 109 };
 110
 111 struct lib64_elfinfo
 112 {
 113         Elf64_Ehdr      *hdr;
 114         Elf64_Sym       *dynsym;
 115         unsigned long   dynsymsize;
 116         char            *dynstr;
 117         unsigned long   text;
 118 };
 119
 120
 121 /*
 122  * This is called from binfmt_elf, we create the special vma for the
 123  * vDSO and insert it into the mm struct tree
 124  */
 125 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 126 {
 127         struct mm_struct *mm = current->mm;
 128         struct page **vdso_pagelist;
 129         unsigned long vdso_pages;
 130         unsigned long vdso_base;
 131         int rc;
 132
 133         if (!vdso_ready)
 134                 return 0;
 135
 136 #ifdef CONFIG_PPC64
 137         if (is_32bit_task()) {
 138                 vdso_pagelist = vdso32_pagelist;
 139                 vdso_pages = vdso32_pages;
 140                 vdso_base = VDSO32_MBASE;
 141         } else {
 142                 vdso_pagelist = vdso64_pagelist;
 143                 vdso_pages = vdso64_pages;
 144                 /*
 145                  * On 64bit we don't have a preferred map address. This
 146                  * allows get_unmapped_area to find an area near other mmaps
 147                  * and most likely share a SLB entry.
 148                  */
 149                 vdso_base = 0;
 150         }
 151 #else
 152         vdso_pagelist = vdso32_pagelist;
 153         vdso_pages = vdso32_pages;
 154         vdso_base = VDSO32_MBASE;
 155 #endif
 156
 157         current->mm->context.vdso_base = 0;
 158
 159         /* vDSO has a problem and was disabled, just don't "enable" it for the
 160          * process
 161          */
 162         if (vdso_pages == 0)
 163                 return 0;
 164         /* Add a page to the vdso size for the data page */
 165         vdso_pages ++;
 166
 167         /*
 168          * pick a base address for the vDSO in process space. We try to put it
 169          * at vdso_base which is the "natural" base for it, but we might fail
 170          * and end up putting it elsewhere.
 171          * Add enough to the size so that the result can be aligned.
 172          */
 173         if (mmap_write_lock_killable(mm))
 174                 return -EINTR;
 175         vdso_base = get_unmapped_area(NULL, vdso_base,
 176                                       (vdso_pages << PAGE_SHIFT) +
 177                                       ((VDSO_ALIGNMENT - 1) & PAGE_MASK),
 178                                       0, 0);
 179         if (IS_ERR_VALUE(vdso_base)) {
 180                 rc = vdso_base;
 181                 goto fail_mmapsem;
 182         }
 183
 184         /* Add required alignment. */
 185         vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT);
 186
 187         /*
 188          * Put vDSO base into mm struct. We need to do this before calling
 189          * install_special_mapping or the perf counter mmap tracking code
 190          * will fail to recognise it as a vDSO (since arch_vma_name fails).
 191          */
 192         current->mm->context.vdso_base = vdso_base;
 193
 194         /*
 195          * our vma flags don't have VM_WRITE so by default, the process isn't
 196          * allowed to write those pages.
 197          * gdb can break that with ptrace interface, and thus trigger COW on
 198          * those pages but it's then your responsibility to never do that on
 199          * the "data" page of the vDSO or you'll stop getting kernel updates
 200          * and your nice userland gettimeofday will be totally dead.
 201          * It's fine to use that for setting breakpoints in the vDSO code
 202          * pages though.
 203          */
 204         rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
 205                                      VM_READ|VM_EXEC|
 206                                      VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
 207                                      vdso_pagelist);
 208         if (rc) {
 209                 current->mm->context.vdso_base = 0;
 210                 goto fail_mmapsem;
 211         }
 212
 213         mmap_write_unlock(mm);
 214         return 0;
 215
 216  fail_mmapsem:
 217         mmap_write_unlock(mm);
 218         return rc;
 219 }
 220
 221 const char *arch_vma_name(struct vm_area_struct *vma)
 222 {
 223         if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
 224                 return "[vdso]";
 225         return NULL;
 226 }
 227
 228
 229
 230 #ifdef CONFIG_VDSO32
 231 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
 232                                   unsigned long *size)
 233 {
 234         Elf32_Shdr *sechdrs;
 235         unsigned int i;
 236         char *secnames;
 237
 238         /* Grab section headers and strings so we can tell who is who */
 239         sechdrs = (void *)ehdr + ehdr->e_shoff;
 240         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
 241
 242         /* Find the section they want */
 243         for (i = 1; i < ehdr->e_shnum; i++) {
 244                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
 245                         if (size)
 246                                 *size = sechdrs[i].sh_size;
 247                         return (void *)ehdr + sechdrs[i].sh_offset;
 248                 }
 249         }
 250         *size = 0;
 251         return NULL;
 252 }
 253
 254 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
 255                                         const char *symname)
 256 {
 257         unsigned int i;
 258         char name[MAX_SYMNAME], *c;
 259
 260         for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
 261                 if (lib->dynsym[i].st_name == 0)
 262                         continue;
 263                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
 264                         MAX_SYMNAME);
 265                 c = strchr(name, '@');
 266                 if (c)
 267                         *c = 0;
 268                 if (strcmp(symname, name) == 0)
 269                         return &lib->dynsym[i];
 270         }
 271         return NULL;
 272 }
 273
 274 /* Note that we assume the section is .text and the symbol is relative to
 275  * the library base
 276  */
 277 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
 278                                             const char *symname)
 279 {
 280         Elf32_Sym *sym = find_symbol32(lib, symname);
 281
 282         if (sym == NULL) {
 283                 printk(KERN_WARNING "vDSO32: function %s not found !\n",
 284                        symname);
 285                 return 0;
 286         }
 287         return sym->st_value - VDSO32_LBASE;
 288 }
 289
 290 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
 291                                        struct lib64_elfinfo *v64,
 292                                        const char *orig, const char *fix)
 293 {
 294         Elf32_Sym *sym32_gen, *sym32_fix;
 295
 296         sym32_gen = find_symbol32(v32, orig);
 297         if (sym32_gen == NULL) {
 298                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
 299                 return -1;
 300         }
 301         if (fix == NULL) {
 302                 sym32_gen->st_name = 0;
 303                 return 0;
 304         }
 305         sym32_fix = find_symbol32(v32, fix);
 306         if (sym32_fix == NULL) {
 307                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
 308                 return -1;
 309         }
 310         sym32_gen->st_value = sym32_fix->st_value;
 311         sym32_gen->st_size = sym32_fix->st_size;
 312         sym32_gen->st_info = sym32_fix->st_info;
 313         sym32_gen->st_other = sym32_fix->st_other;
 314         sym32_gen->st_shndx = sym32_fix->st_shndx;
 315
 316         return 0;
 317 }
 318 #else /* !CONFIG_VDSO32 */
 319 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
 320                                             const char *symname)
 321 {
 322         return 0;
 323 }
 324
 325 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
 326                                        struct lib64_elfinfo *v64,
 327                                        const char *orig, const char *fix)
 328 {
 329         return 0;
 330 }
 331 #endif /* CONFIG_VDSO32 */
 332
 333
 334 #ifdef CONFIG_PPC64
 335
 336 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
 337                                   unsigned long *size)
 338 {
 339         Elf64_Shdr *sechdrs;
 340         unsigned int i;
 341         char *secnames;
 342
 343         /* Grab section headers and strings so we can tell who is who */
 344         sechdrs = (void *)ehdr + ehdr->e_shoff;
 345         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
 346
 347         /* Find the section they want */
 348         for (i = 1; i < ehdr->e_shnum; i++) {
 349                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
 350                         if (size)
 351                                 *size = sechdrs[i].sh_size;
 352                         return (void *)ehdr + sechdrs[i].sh_offset;
 353                 }
 354         }
 355         if (size)
 356                 *size = 0;
 357         return NULL;
 358 }
 359
 360 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
 361                                         const char *symname)
 362 {
 363         unsigned int i;
 364         char name[MAX_SYMNAME], *c;
 365
 366         for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
 367                 if (lib->dynsym[i].st_name == 0)
 368                         continue;
 369                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
 370                         MAX_SYMNAME);
 371                 c = strchr(name, '@');
 372                 if (c)
 373                         *c = 0;
 374                 if (strcmp(symname, name) == 0)
 375                         return &lib->dynsym[i];
 376         }
 377         return NULL;
 378 }
 379
 380 /* Note that we assume the section is .text and the symbol is relative to
 381  * the library base
 382  */
 383 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
 384                                             const char *symname)
 385 {
 386         Elf64_Sym *sym = find_symbol64(lib, symname);
 387
 388         if (sym == NULL) {
 389                 printk(KERN_WARNING "vDSO64: function %s not found !\n",
 390                        symname);
 391                 return 0;
 392         }
 393         return sym->st_value - VDSO64_LBASE;
 394 }
 395
 396 static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32,
 397                                        struct lib64_elfinfo *v64,
 398                                        const char *orig, const char *fix)
 399 {
 400         Elf64_Sym *sym64_gen, *sym64_fix;
 401
 402         sym64_gen = find_symbol64(v64, orig);
 403         if (sym64_gen == NULL) {
 404                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
 405                 return -1;
 406         }
 407         if (fix == NULL) {
 408                 sym64_gen->st_name = 0;
 409                 return 0;
 410         }
 411         sym64_fix = find_symbol64(v64, fix);
 412         if (sym64_fix == NULL) {
 413                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
 414                 return -1;
 415         }
 416         sym64_gen->st_value = sym64_fix->st_value;
 417         sym64_gen->st_size = sym64_fix->st_size;
 418         sym64_gen->st_info = sym64_fix->st_info;
 419         sym64_gen->st_other = sym64_fix->st_other;
 420         sym64_gen->st_shndx = sym64_fix->st_shndx;
 421
 422         return 0;
 423 }
 424
 425 #endif /* CONFIG_PPC64 */
 426
 427
 428 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
 429                                         struct lib64_elfinfo *v64)
 430 {
 431         void *sect;
 432
 433         /*
 434          * Locate symbol tables & text section
 435          */
 436
 437 #ifdef CONFIG_VDSO32
 438         v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
 439         v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
 440         if (v32->dynsym == NULL || v32->dynstr == NULL) {
 441                 printk(KERN_ERR "vDSO32: required symbol section not found\n");
 442                 return -1;
 443         }
 444         sect = find_section32(v32->hdr, ".text", NULL);
 445         if (sect == NULL) {
 446                 printk(KERN_ERR "vDSO32: the .text section was not found\n");
 447                 return -1;
 448         }
 449         v32->text = sect - vdso32_kbase;
 450 #endif
 451
 452 #ifdef CONFIG_PPC64
 453         v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
 454         v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
 455         if (v64->dynsym == NULL || v64->dynstr == NULL) {
 456                 printk(KERN_ERR "vDSO64: required symbol section not found\n");
 457                 return -1;
 458         }
 459         sect = find_section64(v64->hdr, ".text", NULL);
 460         if (sect == NULL) {
 461                 printk(KERN_ERR "vDSO64: the .text section was not found\n");
 462                 return -1;
 463         }
 464         v64->text = sect - vdso64_kbase;
 465 #endif /* CONFIG_PPC64 */
 466
 467         return 0;
 468 }
 469
 470 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
 471                                           struct lib64_elfinfo *v64)
 472 {
 473         /*
 474          * Find signal trampolines
 475          */
 476
 477 #ifdef CONFIG_PPC64
 478         vdso64_rt_sigtramp = find_function64(v64, "__kernel_start_sigtramp_rt64");
 479 #endif
 480         vdso32_sigtramp    = find_function32(v32, "__kernel_sigtramp32");
 481         vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
 482 }
 483
 484 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
 485                                        struct lib64_elfinfo *v64)
 486 {
 487 #ifdef CONFIG_VDSO32
 488         Elf32_Sym *sym32;
 489 #endif
 490 #ifdef CONFIG_PPC64
 491         Elf64_Sym *sym64;
 492
 493         sym64 = find_symbol64(v64, "__kernel_datapage_offset");
 494         if (sym64 == NULL) {
 495                 printk(KERN_ERR "vDSO64: Can't find symbol "
 496                        "__kernel_datapage_offset !\n");
 497                 return -1;
 498         }
 499         *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
 500                 (vdso64_pages << PAGE_SHIFT) -
 501                 (sym64->st_value - VDSO64_LBASE);
 502 #endif /* CONFIG_PPC64 */
 503
 504 #ifdef CONFIG_VDSO32
 505         sym32 = find_symbol32(v32, "__kernel_datapage_offset");
 506         if (sym32 == NULL) {
 507                 printk(KERN_ERR "vDSO32: Can't find symbol "
 508                        "__kernel_datapage_offset !\n");
 509                 return -1;
 510         }
 511         *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
 512                 (vdso32_pages << PAGE_SHIFT) -
 513                 (sym32->st_value - VDSO32_LBASE);
 514 #endif
 515
 516         return 0;
 517 }
 518
 519
 520 static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
 521                                       struct lib64_elfinfo *v64)
 522 {
 523         unsigned long size;
 524         void *start;
 525
 526 #ifdef CONFIG_PPC64
 527         start = find_section64(v64->hdr, "__ftr_fixup", &size);
 528         if (start)
 529                 do_feature_fixups(cur_cpu_spec->cpu_features,
 530                                   start, start + size);
 531
 532         start = find_section64(v64->hdr, "__mmu_ftr_fixup", &size);
 533         if (start)
 534                 do_feature_fixups(cur_cpu_spec->mmu_features,
 535                                   start, start + size);
 536
 537         start = find_section64(v64->hdr, "__fw_ftr_fixup", &size);
 538         if (start)
 539                 do_feature_fixups(powerpc_firmware_features,
 540                                   start, start + size);
 541
 542         start = find_section64(v64->hdr, "__lwsync_fixup", &size);
 543         if (start)
 544                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
 545                                  start, start + size);
 546 #endif /* CONFIG_PPC64 */
 547
 548 #ifdef CONFIG_VDSO32
 549         start = find_section32(v32->hdr, "__ftr_fixup", &size);
 550         if (start)
 551                 do_feature_fixups(cur_cpu_spec->cpu_features,
 552                                   start, start + size);
 553
 554         start = find_section32(v32->hdr, "__mmu_ftr_fixup", &size);
 555         if (start)
 556                 do_feature_fixups(cur_cpu_spec->mmu_features,
 557                                   start, start + size);
 558
 559 #ifdef CONFIG_PPC64
 560         start = find_section32(v32->hdr, "__fw_ftr_fixup", &size);
 561         if (start)
 562                 do_feature_fixups(powerpc_firmware_features,
 563                                   start, start + size);
 564 #endif /* CONFIG_PPC64 */
 565
 566         start = find_section32(v32->hdr, "__lwsync_fixup", &size);
 567         if (start)
 568                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
 569                                  start, start + size);
 570 #endif
 571
 572         return 0;
 573 }
 574
 575 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
 576                                        struct lib64_elfinfo *v64)
 577 {
 578         int i;
 579
 580         for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
 581                 struct vdso_patch_def *patch = &vdso_patches[i];
 582                 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
 583                         == patch->ftr_value;
 584                 if (!match)
 585                         continue;
 586
 587                 DBG("replacing %s with %s...\n", patch->gen_name,
 588                     patch->fix_name ? "NONE" : patch->fix_name);
 589
 590                 /*
 591                  * Patch the 32 bits and 64 bits symbols. Note that we do not
 592                  * patch the "." symbol on 64 bits.
 593                  * It would be easy to do, but doesn't seem to be necessary,
 594                  * patching the OPD symbol is enough.
 595                  */
 596                 vdso_do_func_patch32(v32, v64, patch->gen_name,
 597                                      patch->fix_name);
 598 #ifdef CONFIG_PPC64
 599                 vdso_do_func_patch64(v32, v64, patch->gen_name,
 600                                      patch->fix_name);
 601 #endif /* CONFIG_PPC64 */
 602         }
 603
 604         return 0;
 605 }
 606
 607
 608 static __init int vdso_setup(void)
 609 {
 610         struct lib32_elfinfo    v32;
 611         struct lib64_elfinfo    v64;
 612
 613         v32.hdr = vdso32_kbase;
 614 #ifdef CONFIG_PPC64
 615         v64.hdr = vdso64_kbase;
 616 #endif
 617         if (vdso_do_find_sections(&v32, &v64))
 618                 return -1;
 619
 620         if (vdso_fixup_datapage(&v32, &v64))
 621                 return -1;
 622
 623         if (vdso_fixup_features(&v32, &v64))
 624                 return -1;
 625
 626         if (vdso_fixup_alt_funcs(&v32, &v64))
 627                 return -1;
 628
 629         vdso_setup_trampolines(&v32, &v64);
 630
 631         return 0;
 632 }
 633
 634 /*
 635  * Called from setup_arch to initialize the bitmap of available
 636  * syscalls in the systemcfg page
 637  */
 638 static void __init vdso_setup_syscall_map(void)
 639 {
 640         unsigned int i;
 641         extern unsigned long *sys_call_table;
 642 #ifdef CONFIG_PPC64
 643         extern unsigned long *compat_sys_call_table;
 644 #endif
 645         extern unsigned long sys_ni_syscall;
 646
 647
 648         for (i = 0; i < NR_syscalls; i++) {
 649 #ifdef CONFIG_PPC64
 650                 if (sys_call_table[i] != sys_ni_syscall)
 651                         vdso_data->syscall_map_64[i >> 5] |=
 652                                 0x80000000UL >> (i & 0x1f);
 653                 if (IS_ENABLED(CONFIG_COMPAT) &&
 654                     compat_sys_call_table[i] != sys_ni_syscall)
 655                         vdso_data->syscall_map_32[i >> 5] |=
 656                                 0x80000000UL >> (i & 0x1f);
 657 #else /* CONFIG_PPC64 */
 658                 if (sys_call_table[i] != sys_ni_syscall)
 659                         vdso_data->syscall_map_32[i >> 5] |=
 660                                 0x80000000UL >> (i & 0x1f);
 661 #endif /* CONFIG_PPC64 */
 662         }
 663 }
 664
 665 #ifdef CONFIG_PPC64
 666 int vdso_getcpu_init(void)
 667 {
 668         unsigned long cpu, node, val;
 669
 670         /*
 671          * SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node
 672          * in the next 16 bits.  The VDSO uses this to implement getcpu().
 673          */
 674         cpu = get_cpu();
 675         WARN_ON_ONCE(cpu > 0xffff);
 676
 677         node = cpu_to_node(cpu);
 678         WARN_ON_ONCE(node > 0xffff);
 679
 680         val = (cpu & 0xffff) | ((node & 0xffff) << 16);
 681         mtspr(SPRN_SPRG_VDSO_WRITE, val);
 682         get_paca()->sprg_vdso = val;
 683
 684         put_cpu();
 685
 686         return 0;
 687 }
 688 /* We need to call this before SMP init */
 689 early_initcall(vdso_getcpu_init);
 690 #endif
 691
 692 static int __init vdso_init(void)
 693 {
 694         int i;
 695
 696 #ifdef CONFIG_PPC64
 697         /*
 698          * Fill up the "systemcfg" stuff for backward compatibility
 699          */
 700         strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
 701         vdso_data->version.major = SYSTEMCFG_MAJOR;
 702         vdso_data->version.minor = SYSTEMCFG_MINOR;
 703         vdso_data->processor = mfspr(SPRN_PVR);
 704         /*
 705          * Fake the old platform number for pSeries and add
 706          * in LPAR bit if necessary
 707          */
 708         vdso_data->platform = 0x100;
 709         if (firmware_has_feature(FW_FEATURE_LPAR))
 710                 vdso_data->platform |= 1;
 711         vdso_data->physicalMemorySize = memblock_phys_mem_size();
 712         vdso_data->dcache_size = ppc64_caches.l1d.size;
 713         vdso_data->dcache_line_size = ppc64_caches.l1d.line_size;
 714         vdso_data->icache_size = ppc64_caches.l1i.size;
 715         vdso_data->icache_line_size = ppc64_caches.l1i.line_size;
 716         vdso_data->dcache_block_size = ppc64_caches.l1d.block_size;
 717         vdso_data->icache_block_size = ppc64_caches.l1i.block_size;
 718         vdso_data->dcache_log_block_size = ppc64_caches.l1d.log_block_size;
 719         vdso_data->icache_log_block_size = ppc64_caches.l1i.log_block_size;
 720
 721         /*
 722          * Calculate the size of the 64 bits vDSO
 723          */
 724         vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
 725         DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
 726 #endif /* CONFIG_PPC64 */
 727
 728
 729 #ifdef CONFIG_VDSO32
 730         vdso32_kbase = &vdso32_start;
 731
 732         /*
 733          * Calculate the size of the 32 bits vDSO
 734          */
 735         vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
 736         DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
 737 #endif
 738
 739
 740         /*
 741          * Setup the syscall map in the vDOS
 742          */
 743         vdso_setup_syscall_map();
 744
 745         /*
 746          * Initialize the vDSO images in memory, that is do necessary
 747          * fixups of vDSO symbols, locate trampolines, etc...
 748          */
 749         if (vdso_setup()) {
 750                 printk(KERN_ERR "vDSO setup failure, not enabled !\n");
 751                 vdso32_pages = 0;
 752 #ifdef CONFIG_PPC64
 753                 vdso64_pages = 0;
 754 #endif
 755                 return 0;
 756         }
 757
 758 #ifdef CONFIG_VDSO32
 759         /* Make sure pages are in the correct state */
 760         vdso32_pagelist = kcalloc(vdso32_pages + 2, sizeof(struct page *),
 761                                   GFP_KERNEL);
 762         BUG_ON(vdso32_pagelist == NULL);
 763         for (i = 0; i < vdso32_pages; i++) {
 764                 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
 765                 get_page(pg);
 766                 vdso32_pagelist[i] = pg;
 767         }
 768         vdso32_pagelist[i++] = virt_to_page(vdso_data);
 769         vdso32_pagelist[i] = NULL;
 770 #endif
 771
 772 #ifdef CONFIG_PPC64
 773         vdso64_pagelist = kcalloc(vdso64_pages + 2, sizeof(struct page *),
 774                                   GFP_KERNEL);
 775         BUG_ON(vdso64_pagelist == NULL);
 776         for (i = 0; i < vdso64_pages; i++) {
 777                 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
 778                 get_page(pg);
 779                 vdso64_pagelist[i] = pg;
 780         }
 781         vdso64_pagelist[i++] = virt_to_page(vdso_data);
 782         vdso64_pagelist[i] = NULL;
 783 #endif /* CONFIG_PPC64 */
 784
 785         get_page(virt_to_page(vdso_data));
 786
 787         smp_wmb();
 788         vdso_ready = 1;
 789
 790         return 0;
 791 }
 792 arch_initcall(vdso_init);