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/cpu_has_feature.h> 26 #include <asm/pgtable.h> 27 #include <asm/processor.h> 28 #include <asm/mmu.h> 29 #include <asm/mmu_context.h> 30 #include <asm/prom.h> 31 #include <asm/machdep.h> 32 #include <asm/cputable.h> 33 #include <asm/sections.h> 34 #include <asm/firmware.h> 35 #include <asm/vdso.h> 36 #include <asm/vdso_datapage.h> 37 #include <asm/setup.h> 38 39 #undef DEBUG 40 41 #ifdef DEBUG 42 #define DBG(fmt...) printk(fmt) 43 #else 44 #define DBG(fmt...) 45 #endif 46 47 /* Max supported size for symbol names */ 48 #define MAX_SYMNAME 64 49 50 /* The alignment of the vDSO */ 51 #define VDSO_ALIGNMENT (1 << 16) 52 53 static unsigned int vdso32_pages; 54 static void *vdso32_kbase; 55 static struct page **vdso32_pagelist; 56 unsigned long vdso32_sigtramp; 57 unsigned long vdso32_rt_sigtramp; 58 59 #ifdef CONFIG_VDSO32 60 extern char vdso32_start, vdso32_end; 61 #endif 62 63 #ifdef CONFIG_PPC64 64 extern char vdso64_start, vdso64_end; 65 static void *vdso64_kbase = &vdso64_start; 66 static unsigned int vdso64_pages; 67 static struct page **vdso64_pagelist; 68 unsigned long vdso64_rt_sigtramp; 69 #endif /* CONFIG_PPC64 */ 70 71 static int vdso_ready; 72 73 /* 74 * The vdso data page (aka. systemcfg for old ppc64 fans) is here. 75 * Once the early boot kernel code no longer needs to muck around 76 * with it, it will become dynamically allocated 77 */ 78 static union { 79 struct vdso_data data; 80 u8 page[PAGE_SIZE]; 81 } vdso_data_store __page_aligned_data; 82 struct vdso_data *vdso_data = &vdso_data_store.data; 83 84 /* Format of the patch table */ 85 struct vdso_patch_def 86 { 87 unsigned long ftr_mask, ftr_value; 88 const char *gen_name; 89 const char *fix_name; 90 }; 91 92 /* Table of functions to patch based on the CPU type/revision 93 * 94 * Currently, we only change sync_dicache to do nothing on processors 95 * with a coherent icache 96 */ 97 static struct vdso_patch_def vdso_patches[] = { 98 { 99 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE, 100 "__kernel_sync_dicache", "__kernel_sync_dicache_p5" 101 }, 102 { 103 CPU_FTR_USE_TB, 0, 104 "__kernel_gettimeofday", NULL 105 }, 106 { 107 CPU_FTR_USE_TB, 0, 108 "__kernel_clock_gettime", NULL 109 }, 110 { 111 CPU_FTR_USE_TB, 0, 112 "__kernel_clock_getres", NULL 113 }, 114 { 115 CPU_FTR_USE_TB, 0, 116 "__kernel_get_tbfreq", NULL 117 }, 118 { 119 CPU_FTR_USE_TB, 0, 120 "__kernel_time", NULL 121 }, 122 }; 123 124 /* 125 * Some infos carried around for each of them during parsing at 126 * boot time. 127 */ 128 struct lib32_elfinfo 129 { 130 Elf32_Ehdr *hdr; /* ptr to ELF */ 131 Elf32_Sym *dynsym; /* ptr to .dynsym section */ 132 unsigned long dynsymsize; /* size of .dynsym section */ 133 char *dynstr; /* ptr to .dynstr section */ 134 unsigned long text; /* offset of .text section in .so */ 135 }; 136 137 struct lib64_elfinfo 138 { 139 Elf64_Ehdr *hdr; 140 Elf64_Sym *dynsym; 141 unsigned long dynsymsize; 142 char *dynstr; 143 unsigned long text; 144 }; 145 146 147 /* 148 * This is called from binfmt_elf, we create the special vma for the 149 * vDSO and insert it into the mm struct tree 150 */ 151 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) 152 { 153 struct mm_struct *mm = current->mm; 154 struct page **vdso_pagelist; 155 unsigned long vdso_pages; 156 unsigned long vdso_base; 157 int rc; 158 159 if (!vdso_ready) 160 return 0; 161 162 #ifdef CONFIG_PPC64 163 if (is_32bit_task()) { 164 vdso_pagelist = vdso32_pagelist; 165 vdso_pages = vdso32_pages; 166 vdso_base = VDSO32_MBASE; 167 } else { 168 vdso_pagelist = vdso64_pagelist; 169 vdso_pages = vdso64_pages; 170 /* 171 * On 64bit we don't have a preferred map address. This 172 * allows get_unmapped_area to find an area near other mmaps 173 * and most likely share a SLB entry. 174 */ 175 vdso_base = 0; 176 } 177 #else 178 vdso_pagelist = vdso32_pagelist; 179 vdso_pages = vdso32_pages; 180 vdso_base = VDSO32_MBASE; 181 #endif 182 183 current->mm->context.vdso_base = 0; 184 185 /* vDSO has a problem and was disabled, just don't "enable" it for the 186 * process 187 */ 188 if (vdso_pages == 0) 189 return 0; 190 /* Add a page to the vdso size for the data page */ 191 vdso_pages ++; 192 193 /* 194 * pick a base address for the vDSO in process space. We try to put it 195 * at vdso_base which is the "natural" base for it, but we might fail 196 * and end up putting it elsewhere. 197 * Add enough to the size so that the result can be aligned. 198 */ 199 if (down_write_killable(&mm->mmap_sem)) 200 return -EINTR; 201 vdso_base = get_unmapped_area(NULL, vdso_base, 202 (vdso_pages << PAGE_SHIFT) + 203 ((VDSO_ALIGNMENT - 1) & PAGE_MASK), 204 0, 0); 205 if (IS_ERR_VALUE(vdso_base)) { 206 rc = vdso_base; 207 goto fail_mmapsem; 208 } 209 210 /* Add required alignment. */ 211 vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT); 212 213 /* 214 * Put vDSO base into mm struct. We need to do this before calling 215 * install_special_mapping or the perf counter mmap tracking code 216 * will fail to recognise it as a vDSO (since arch_vma_name fails). 217 */ 218 current->mm->context.vdso_base = vdso_base; 219 220 /* 221 * our vma flags don't have VM_WRITE so by default, the process isn't 222 * allowed to write those pages. 223 * gdb can break that with ptrace interface, and thus trigger COW on 224 * those pages but it's then your responsibility to never do that on 225 * the "data" page of the vDSO or you'll stop getting kernel updates 226 * and your nice userland gettimeofday will be totally dead. 227 * It's fine to use that for setting breakpoints in the vDSO code 228 * pages though. 229 */ 230 rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT, 231 VM_READ|VM_EXEC| 232 VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, 233 vdso_pagelist); 234 if (rc) { 235 current->mm->context.vdso_base = 0; 236 goto fail_mmapsem; 237 } 238 239 up_write(&mm->mmap_sem); 240 return 0; 241 242 fail_mmapsem: 243 up_write(&mm->mmap_sem); 244 return rc; 245 } 246 247 const char *arch_vma_name(struct vm_area_struct *vma) 248 { 249 if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base) 250 return "[vdso]"; 251 return NULL; 252 } 253 254 255 256 #ifdef CONFIG_VDSO32 257 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname, 258 unsigned long *size) 259 { 260 Elf32_Shdr *sechdrs; 261 unsigned int i; 262 char *secnames; 263 264 /* Grab section headers and strings so we can tell who is who */ 265 sechdrs = (void *)ehdr + ehdr->e_shoff; 266 secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; 267 268 /* Find the section they want */ 269 for (i = 1; i < ehdr->e_shnum; i++) { 270 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { 271 if (size) 272 *size = sechdrs[i].sh_size; 273 return (void *)ehdr + sechdrs[i].sh_offset; 274 } 275 } 276 *size = 0; 277 return NULL; 278 } 279 280 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib, 281 const char *symname) 282 { 283 unsigned int i; 284 char name[MAX_SYMNAME], *c; 285 286 for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) { 287 if (lib->dynsym[i].st_name == 0) 288 continue; 289 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, 290 MAX_SYMNAME); 291 c = strchr(name, '@'); 292 if (c) 293 *c = 0; 294 if (strcmp(symname, name) == 0) 295 return &lib->dynsym[i]; 296 } 297 return NULL; 298 } 299 300 /* Note that we assume the section is .text and the symbol is relative to 301 * the library base 302 */ 303 static unsigned long __init find_function32(struct lib32_elfinfo *lib, 304 const char *symname) 305 { 306 Elf32_Sym *sym = find_symbol32(lib, symname); 307 308 if (sym == NULL) { 309 printk(KERN_WARNING "vDSO32: function %s not found !\n", 310 symname); 311 return 0; 312 } 313 return sym->st_value - VDSO32_LBASE; 314 } 315 316 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32, 317 struct lib64_elfinfo *v64, 318 const char *orig, const char *fix) 319 { 320 Elf32_Sym *sym32_gen, *sym32_fix; 321 322 sym32_gen = find_symbol32(v32, orig); 323 if (sym32_gen == NULL) { 324 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig); 325 return -1; 326 } 327 if (fix == NULL) { 328 sym32_gen->st_name = 0; 329 return 0; 330 } 331 sym32_fix = find_symbol32(v32, fix); 332 if (sym32_fix == NULL) { 333 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix); 334 return -1; 335 } 336 sym32_gen->st_value = sym32_fix->st_value; 337 sym32_gen->st_size = sym32_fix->st_size; 338 sym32_gen->st_info = sym32_fix->st_info; 339 sym32_gen->st_other = sym32_fix->st_other; 340 sym32_gen->st_shndx = sym32_fix->st_shndx; 341 342 return 0; 343 } 344 #else /* !CONFIG_VDSO32 */ 345 static unsigned long __init find_function32(struct lib32_elfinfo *lib, 346 const char *symname) 347 { 348 return 0; 349 } 350 351 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32, 352 struct lib64_elfinfo *v64, 353 const char *orig, const char *fix) 354 { 355 return 0; 356 } 357 #endif /* CONFIG_VDSO32 */ 358 359 360 #ifdef CONFIG_PPC64 361 362 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname, 363 unsigned long *size) 364 { 365 Elf64_Shdr *sechdrs; 366 unsigned int i; 367 char *secnames; 368 369 /* Grab section headers and strings so we can tell who is who */ 370 sechdrs = (void *)ehdr + ehdr->e_shoff; 371 secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; 372 373 /* Find the section they want */ 374 for (i = 1; i < ehdr->e_shnum; i++) { 375 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { 376 if (size) 377 *size = sechdrs[i].sh_size; 378 return (void *)ehdr + sechdrs[i].sh_offset; 379 } 380 } 381 if (size) 382 *size = 0; 383 return NULL; 384 } 385 386 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib, 387 const char *symname) 388 { 389 unsigned int i; 390 char name[MAX_SYMNAME], *c; 391 392 for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) { 393 if (lib->dynsym[i].st_name == 0) 394 continue; 395 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, 396 MAX_SYMNAME); 397 c = strchr(name, '@'); 398 if (c) 399 *c = 0; 400 if (strcmp(symname, name) == 0) 401 return &lib->dynsym[i]; 402 } 403 return NULL; 404 } 405 406 /* Note that we assume the section is .text and the symbol is relative to 407 * the library base 408 */ 409 static unsigned long __init find_function64(struct lib64_elfinfo *lib, 410 const char *symname) 411 { 412 Elf64_Sym *sym = find_symbol64(lib, symname); 413 414 if (sym == NULL) { 415 printk(KERN_WARNING "vDSO64: function %s not found !\n", 416 symname); 417 return 0; 418 } 419 #ifdef VDS64_HAS_DESCRIPTORS 420 return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) - 421 VDSO64_LBASE; 422 #else 423 return sym->st_value - VDSO64_LBASE; 424 #endif 425 } 426 427 static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32, 428 struct lib64_elfinfo *v64, 429 const char *orig, const char *fix) 430 { 431 Elf64_Sym *sym64_gen, *sym64_fix; 432 433 sym64_gen = find_symbol64(v64, orig); 434 if (sym64_gen == NULL) { 435 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig); 436 return -1; 437 } 438 if (fix == NULL) { 439 sym64_gen->st_name = 0; 440 return 0; 441 } 442 sym64_fix = find_symbol64(v64, fix); 443 if (sym64_fix == NULL) { 444 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix); 445 return -1; 446 } 447 sym64_gen->st_value = sym64_fix->st_value; 448 sym64_gen->st_size = sym64_fix->st_size; 449 sym64_gen->st_info = sym64_fix->st_info; 450 sym64_gen->st_other = sym64_fix->st_other; 451 sym64_gen->st_shndx = sym64_fix->st_shndx; 452 453 return 0; 454 } 455 456 #endif /* CONFIG_PPC64 */ 457 458 459 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32, 460 struct lib64_elfinfo *v64) 461 { 462 void *sect; 463 464 /* 465 * Locate symbol tables & text section 466 */ 467 468 #ifdef CONFIG_VDSO32 469 v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize); 470 v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL); 471 if (v32->dynsym == NULL || v32->dynstr == NULL) { 472 printk(KERN_ERR "vDSO32: required symbol section not found\n"); 473 return -1; 474 } 475 sect = find_section32(v32->hdr, ".text", NULL); 476 if (sect == NULL) { 477 printk(KERN_ERR "vDSO32: the .text section was not found\n"); 478 return -1; 479 } 480 v32->text = sect - vdso32_kbase; 481 #endif 482 483 #ifdef CONFIG_PPC64 484 v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize); 485 v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL); 486 if (v64->dynsym == NULL || v64->dynstr == NULL) { 487 printk(KERN_ERR "vDSO64: required symbol section not found\n"); 488 return -1; 489 } 490 sect = find_section64(v64->hdr, ".text", NULL); 491 if (sect == NULL) { 492 printk(KERN_ERR "vDSO64: the .text section was not found\n"); 493 return -1; 494 } 495 v64->text = sect - vdso64_kbase; 496 #endif /* CONFIG_PPC64 */ 497 498 return 0; 499 } 500 501 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32, 502 struct lib64_elfinfo *v64) 503 { 504 /* 505 * Find signal trampolines 506 */ 507 508 #ifdef CONFIG_PPC64 509 vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64"); 510 #endif 511 vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32"); 512 vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32"); 513 } 514 515 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32, 516 struct lib64_elfinfo *v64) 517 { 518 #ifdef CONFIG_VDSO32 519 Elf32_Sym *sym32; 520 #endif 521 #ifdef CONFIG_PPC64 522 Elf64_Sym *sym64; 523 524 sym64 = find_symbol64(v64, "__kernel_datapage_offset"); 525 if (sym64 == NULL) { 526 printk(KERN_ERR "vDSO64: Can't find symbol " 527 "__kernel_datapage_offset !\n"); 528 return -1; 529 } 530 *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) = 531 (vdso64_pages << PAGE_SHIFT) - 532 (sym64->st_value - VDSO64_LBASE); 533 #endif /* CONFIG_PPC64 */ 534 535 #ifdef CONFIG_VDSO32 536 sym32 = find_symbol32(v32, "__kernel_datapage_offset"); 537 if (sym32 == NULL) { 538 printk(KERN_ERR "vDSO32: Can't find symbol " 539 "__kernel_datapage_offset !\n"); 540 return -1; 541 } 542 *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) = 543 (vdso32_pages << PAGE_SHIFT) - 544 (sym32->st_value - VDSO32_LBASE); 545 #endif 546 547 return 0; 548 } 549 550 551 static __init int vdso_fixup_features(struct lib32_elfinfo *v32, 552 struct lib64_elfinfo *v64) 553 { 554 unsigned long size; 555 void *start; 556 557 #ifdef CONFIG_PPC64 558 start = find_section64(v64->hdr, "__ftr_fixup", &size); 559 if (start) 560 do_feature_fixups(cur_cpu_spec->cpu_features, 561 start, start + size); 562 563 start = find_section64(v64->hdr, "__mmu_ftr_fixup", &size); 564 if (start) 565 do_feature_fixups(cur_cpu_spec->mmu_features, 566 start, start + size); 567 568 start = find_section64(v64->hdr, "__fw_ftr_fixup", &size); 569 if (start) 570 do_feature_fixups(powerpc_firmware_features, 571 start, start + size); 572 573 start = find_section64(v64->hdr, "__lwsync_fixup", &size); 574 if (start) 575 do_lwsync_fixups(cur_cpu_spec->cpu_features, 576 start, start + size); 577 #endif /* CONFIG_PPC64 */ 578 579 #ifdef CONFIG_VDSO32 580 start = find_section32(v32->hdr, "__ftr_fixup", &size); 581 if (start) 582 do_feature_fixups(cur_cpu_spec->cpu_features, 583 start, start + size); 584 585 start = find_section32(v32->hdr, "__mmu_ftr_fixup", &size); 586 if (start) 587 do_feature_fixups(cur_cpu_spec->mmu_features, 588 start, start + size); 589 590 #ifdef CONFIG_PPC64 591 start = find_section32(v32->hdr, "__fw_ftr_fixup", &size); 592 if (start) 593 do_feature_fixups(powerpc_firmware_features, 594 start, start + size); 595 #endif /* CONFIG_PPC64 */ 596 597 start = find_section32(v32->hdr, "__lwsync_fixup", &size); 598 if (start) 599 do_lwsync_fixups(cur_cpu_spec->cpu_features, 600 start, start + size); 601 #endif 602 603 return 0; 604 } 605 606 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32, 607 struct lib64_elfinfo *v64) 608 { 609 int i; 610 611 for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) { 612 struct vdso_patch_def *patch = &vdso_patches[i]; 613 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask) 614 == patch->ftr_value; 615 if (!match) 616 continue; 617 618 DBG("replacing %s with %s...\n", patch->gen_name, 619 patch->fix_name ? "NONE" : patch->fix_name); 620 621 /* 622 * Patch the 32 bits and 64 bits symbols. Note that we do not 623 * patch the "." symbol on 64 bits. 624 * It would be easy to do, but doesn't seem to be necessary, 625 * patching the OPD symbol is enough. 626 */ 627 vdso_do_func_patch32(v32, v64, patch->gen_name, 628 patch->fix_name); 629 #ifdef CONFIG_PPC64 630 vdso_do_func_patch64(v32, v64, patch->gen_name, 631 patch->fix_name); 632 #endif /* CONFIG_PPC64 */ 633 } 634 635 return 0; 636 } 637 638 639 static __init int vdso_setup(void) 640 { 641 struct lib32_elfinfo v32; 642 struct lib64_elfinfo v64; 643 644 v32.hdr = vdso32_kbase; 645 #ifdef CONFIG_PPC64 646 v64.hdr = vdso64_kbase; 647 #endif 648 if (vdso_do_find_sections(&v32, &v64)) 649 return -1; 650 651 if (vdso_fixup_datapage(&v32, &v64)) 652 return -1; 653 654 if (vdso_fixup_features(&v32, &v64)) 655 return -1; 656 657 if (vdso_fixup_alt_funcs(&v32, &v64)) 658 return -1; 659 660 vdso_setup_trampolines(&v32, &v64); 661 662 return 0; 663 } 664 665 /* 666 * Called from setup_arch to initialize the bitmap of available 667 * syscalls in the systemcfg page 668 */ 669 static void __init vdso_setup_syscall_map(void) 670 { 671 unsigned int i; 672 extern unsigned long *sys_call_table; 673 extern unsigned long sys_ni_syscall; 674 675 676 for (i = 0; i < NR_syscalls; i++) { 677 #ifdef CONFIG_PPC64 678 if (sys_call_table[i*2] != sys_ni_syscall) 679 vdso_data->syscall_map_64[i >> 5] |= 680 0x80000000UL >> (i & 0x1f); 681 if (sys_call_table[i*2+1] != sys_ni_syscall) 682 vdso_data->syscall_map_32[i >> 5] |= 683 0x80000000UL >> (i & 0x1f); 684 #else /* CONFIG_PPC64 */ 685 if (sys_call_table[i] != sys_ni_syscall) 686 vdso_data->syscall_map_32[i >> 5] |= 687 0x80000000UL >> (i & 0x1f); 688 #endif /* CONFIG_PPC64 */ 689 } 690 } 691 692 #ifdef CONFIG_PPC64 693 int vdso_getcpu_init(void) 694 { 695 unsigned long cpu, node, val; 696 697 /* 698 * SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node 699 * in the next 16 bits. The VDSO uses this to implement getcpu(). 700 */ 701 cpu = get_cpu(); 702 WARN_ON_ONCE(cpu > 0xffff); 703 704 node = cpu_to_node(cpu); 705 WARN_ON_ONCE(node > 0xffff); 706 707 val = (cpu & 0xfff) | ((node & 0xffff) << 16); 708 mtspr(SPRN_SPRG_VDSO_WRITE, val); 709 get_paca()->sprg_vdso = val; 710 711 put_cpu(); 712 713 return 0; 714 } 715 /* We need to call this before SMP init */ 716 early_initcall(vdso_getcpu_init); 717 #endif 718 719 static int __init vdso_init(void) 720 { 721 int i; 722 723 #ifdef CONFIG_PPC64 724 /* 725 * Fill up the "systemcfg" stuff for backward compatibility 726 */ 727 strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64"); 728 vdso_data->version.major = SYSTEMCFG_MAJOR; 729 vdso_data->version.minor = SYSTEMCFG_MINOR; 730 vdso_data->processor = mfspr(SPRN_PVR); 731 /* 732 * Fake the old platform number for pSeries and add 733 * in LPAR bit if necessary 734 */ 735 vdso_data->platform = 0x100; 736 if (firmware_has_feature(FW_FEATURE_LPAR)) 737 vdso_data->platform |= 1; 738 vdso_data->physicalMemorySize = memblock_phys_mem_size(); 739 vdso_data->dcache_size = ppc64_caches.dsize; 740 vdso_data->dcache_line_size = ppc64_caches.dline_size; 741 vdso_data->icache_size = ppc64_caches.isize; 742 vdso_data->icache_line_size = ppc64_caches.iline_size; 743 744 /* XXXOJN: Blocks should be added to ppc64_caches and used instead */ 745 vdso_data->dcache_block_size = ppc64_caches.dline_size; 746 vdso_data->icache_block_size = ppc64_caches.iline_size; 747 vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size; 748 vdso_data->icache_log_block_size = ppc64_caches.log_iline_size; 749 750 /* 751 * Calculate the size of the 64 bits vDSO 752 */ 753 vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT; 754 DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages); 755 #else 756 vdso_data->dcache_block_size = L1_CACHE_BYTES; 757 vdso_data->dcache_log_block_size = L1_CACHE_SHIFT; 758 vdso_data->icache_block_size = L1_CACHE_BYTES; 759 vdso_data->icache_log_block_size = L1_CACHE_SHIFT; 760 #endif /* CONFIG_PPC64 */ 761 762 763 #ifdef CONFIG_VDSO32 764 vdso32_kbase = &vdso32_start; 765 766 /* 767 * Calculate the size of the 32 bits vDSO 768 */ 769 vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT; 770 DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages); 771 #endif 772 773 774 /* 775 * Setup the syscall map in the vDOS 776 */ 777 vdso_setup_syscall_map(); 778 779 /* 780 * Initialize the vDSO images in memory, that is do necessary 781 * fixups of vDSO symbols, locate trampolines, etc... 782 */ 783 if (vdso_setup()) { 784 printk(KERN_ERR "vDSO setup failure, not enabled !\n"); 785 vdso32_pages = 0; 786 #ifdef CONFIG_PPC64 787 vdso64_pages = 0; 788 #endif 789 return 0; 790 } 791 792 #ifdef CONFIG_VDSO32 793 /* Make sure pages are in the correct state */ 794 vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2), 795 GFP_KERNEL); 796 BUG_ON(vdso32_pagelist == NULL); 797 for (i = 0; i < vdso32_pages; i++) { 798 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); 799 ClearPageReserved(pg); 800 get_page(pg); 801 vdso32_pagelist[i] = pg; 802 } 803 vdso32_pagelist[i++] = virt_to_page(vdso_data); 804 vdso32_pagelist[i] = NULL; 805 #endif 806 807 #ifdef CONFIG_PPC64 808 vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2), 809 GFP_KERNEL); 810 BUG_ON(vdso64_pagelist == NULL); 811 for (i = 0; i < vdso64_pages; i++) { 812 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); 813 ClearPageReserved(pg); 814 get_page(pg); 815 vdso64_pagelist[i] = pg; 816 } 817 vdso64_pagelist[i++] = virt_to_page(vdso_data); 818 vdso64_pagelist[i] = NULL; 819 #endif /* CONFIG_PPC64 */ 820 821 get_page(virt_to_page(vdso_data)); 822 823 smp_wmb(); 824 vdso_ready = 1; 825 826 return 0; 827 } 828 arch_initcall(vdso_init); 829