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); 828