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 down_write(&mm->mmap_sem); 199 vdso_base = get_unmapped_area(NULL, vdso_base, 200 (vdso_pages << PAGE_SHIFT) + 201 ((VDSO_ALIGNMENT - 1) & PAGE_MASK), 202 0, 0); 203 if (IS_ERR_VALUE(vdso_base)) { 204 rc = vdso_base; 205 goto fail_mmapsem; 206 } 207 208 /* Add required alignment. */ 209 vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT); 210 211 /* 212 * Put vDSO base into mm struct. We need to do this before calling 213 * install_special_mapping or the perf counter mmap tracking code 214 * will fail to recognise it as a vDSO (since arch_vma_name fails). 215 */ 216 current->mm->context.vdso_base = vdso_base; 217 218 /* 219 * our vma flags don't have VM_WRITE so by default, the process isn't 220 * allowed to write those pages. 221 * gdb can break that with ptrace interface, and thus trigger COW on 222 * those pages but it's then your responsibility to never do that on 223 * the "data" page of the vDSO or you'll stop getting kernel updates 224 * and your nice userland gettimeofday will be totally dead. 225 * It's fine to use that for setting breakpoints in the vDSO code 226 * pages though. 227 */ 228 rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT, 229 VM_READ|VM_EXEC| 230 VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, 231 vdso_pagelist); 232 if (rc) { 233 current->mm->context.vdso_base = 0; 234 goto fail_mmapsem; 235 } 236 237 up_write(&mm->mmap_sem); 238 return 0; 239 240 fail_mmapsem: 241 up_write(&mm->mmap_sem); 242 return rc; 243 } 244 245 const char *arch_vma_name(struct vm_area_struct *vma) 246 { 247 if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base) 248 return "[vdso]"; 249 return NULL; 250 } 251 252 253 254 #ifdef CONFIG_VDSO32 255 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname, 256 unsigned long *size) 257 { 258 Elf32_Shdr *sechdrs; 259 unsigned int i; 260 char *secnames; 261 262 /* Grab section headers and strings so we can tell who is who */ 263 sechdrs = (void *)ehdr + ehdr->e_shoff; 264 secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; 265 266 /* Find the section they want */ 267 for (i = 1; i < ehdr->e_shnum; i++) { 268 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { 269 if (size) 270 *size = sechdrs[i].sh_size; 271 return (void *)ehdr + sechdrs[i].sh_offset; 272 } 273 } 274 *size = 0; 275 return NULL; 276 } 277 278 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib, 279 const char *symname) 280 { 281 unsigned int i; 282 char name[MAX_SYMNAME], *c; 283 284 for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) { 285 if (lib->dynsym[i].st_name == 0) 286 continue; 287 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, 288 MAX_SYMNAME); 289 c = strchr(name, '@'); 290 if (c) 291 *c = 0; 292 if (strcmp(symname, name) == 0) 293 return &lib->dynsym[i]; 294 } 295 return NULL; 296 } 297 298 /* Note that we assume the section is .text and the symbol is relative to 299 * the library base 300 */ 301 static unsigned long __init find_function32(struct lib32_elfinfo *lib, 302 const char *symname) 303 { 304 Elf32_Sym *sym = find_symbol32(lib, symname); 305 306 if (sym == NULL) { 307 printk(KERN_WARNING "vDSO32: function %s not found !\n", 308 symname); 309 return 0; 310 } 311 return sym->st_value - VDSO32_LBASE; 312 } 313 314 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32, 315 struct lib64_elfinfo *v64, 316 const char *orig, const char *fix) 317 { 318 Elf32_Sym *sym32_gen, *sym32_fix; 319 320 sym32_gen = find_symbol32(v32, orig); 321 if (sym32_gen == NULL) { 322 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig); 323 return -1; 324 } 325 if (fix == NULL) { 326 sym32_gen->st_name = 0; 327 return 0; 328 } 329 sym32_fix = find_symbol32(v32, fix); 330 if (sym32_fix == NULL) { 331 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix); 332 return -1; 333 } 334 sym32_gen->st_value = sym32_fix->st_value; 335 sym32_gen->st_size = sym32_fix->st_size; 336 sym32_gen->st_info = sym32_fix->st_info; 337 sym32_gen->st_other = sym32_fix->st_other; 338 sym32_gen->st_shndx = sym32_fix->st_shndx; 339 340 return 0; 341 } 342 #else /* !CONFIG_VDSO32 */ 343 static unsigned long __init find_function32(struct lib32_elfinfo *lib, 344 const char *symname) 345 { 346 return 0; 347 } 348 349 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32, 350 struct lib64_elfinfo *v64, 351 const char *orig, const char *fix) 352 { 353 return 0; 354 } 355 #endif /* CONFIG_VDSO32 */ 356 357 358 #ifdef CONFIG_PPC64 359 360 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname, 361 unsigned long *size) 362 { 363 Elf64_Shdr *sechdrs; 364 unsigned int i; 365 char *secnames; 366 367 /* Grab section headers and strings so we can tell who is who */ 368 sechdrs = (void *)ehdr + ehdr->e_shoff; 369 secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; 370 371 /* Find the section they want */ 372 for (i = 1; i < ehdr->e_shnum; i++) { 373 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { 374 if (size) 375 *size = sechdrs[i].sh_size; 376 return (void *)ehdr + sechdrs[i].sh_offset; 377 } 378 } 379 if (size) 380 *size = 0; 381 return NULL; 382 } 383 384 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib, 385 const char *symname) 386 { 387 unsigned int i; 388 char name[MAX_SYMNAME], *c; 389 390 for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) { 391 if (lib->dynsym[i].st_name == 0) 392 continue; 393 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, 394 MAX_SYMNAME); 395 c = strchr(name, '@'); 396 if (c) 397 *c = 0; 398 if (strcmp(symname, name) == 0) 399 return &lib->dynsym[i]; 400 } 401 return NULL; 402 } 403 404 /* Note that we assume the section is .text and the symbol is relative to 405 * the library base 406 */ 407 static unsigned long __init find_function64(struct lib64_elfinfo *lib, 408 const char *symname) 409 { 410 Elf64_Sym *sym = find_symbol64(lib, symname); 411 412 if (sym == NULL) { 413 printk(KERN_WARNING "vDSO64: function %s not found !\n", 414 symname); 415 return 0; 416 } 417 #ifdef VDS64_HAS_DESCRIPTORS 418 return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) - 419 VDSO64_LBASE; 420 #else 421 return sym->st_value - VDSO64_LBASE; 422 #endif 423 } 424 425 static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32, 426 struct lib64_elfinfo *v64, 427 const char *orig, const char *fix) 428 { 429 Elf64_Sym *sym64_gen, *sym64_fix; 430 431 sym64_gen = find_symbol64(v64, orig); 432 if (sym64_gen == NULL) { 433 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig); 434 return -1; 435 } 436 if (fix == NULL) { 437 sym64_gen->st_name = 0; 438 return 0; 439 } 440 sym64_fix = find_symbol64(v64, fix); 441 if (sym64_fix == NULL) { 442 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix); 443 return -1; 444 } 445 sym64_gen->st_value = sym64_fix->st_value; 446 sym64_gen->st_size = sym64_fix->st_size; 447 sym64_gen->st_info = sym64_fix->st_info; 448 sym64_gen->st_other = sym64_fix->st_other; 449 sym64_gen->st_shndx = sym64_fix->st_shndx; 450 451 return 0; 452 } 453 454 #endif /* CONFIG_PPC64 */ 455 456 457 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32, 458 struct lib64_elfinfo *v64) 459 { 460 void *sect; 461 462 /* 463 * Locate symbol tables & text section 464 */ 465 466 #ifdef CONFIG_VDSO32 467 v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize); 468 v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL); 469 if (v32->dynsym == NULL || v32->dynstr == NULL) { 470 printk(KERN_ERR "vDSO32: required symbol section not found\n"); 471 return -1; 472 } 473 sect = find_section32(v32->hdr, ".text", NULL); 474 if (sect == NULL) { 475 printk(KERN_ERR "vDSO32: the .text section was not found\n"); 476 return -1; 477 } 478 v32->text = sect - vdso32_kbase; 479 #endif 480 481 #ifdef CONFIG_PPC64 482 v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize); 483 v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL); 484 if (v64->dynsym == NULL || v64->dynstr == NULL) { 485 printk(KERN_ERR "vDSO64: required symbol section not found\n"); 486 return -1; 487 } 488 sect = find_section64(v64->hdr, ".text", NULL); 489 if (sect == NULL) { 490 printk(KERN_ERR "vDSO64: the .text section was not found\n"); 491 return -1; 492 } 493 v64->text = sect - vdso64_kbase; 494 #endif /* CONFIG_PPC64 */ 495 496 return 0; 497 } 498 499 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32, 500 struct lib64_elfinfo *v64) 501 { 502 /* 503 * Find signal trampolines 504 */ 505 506 #ifdef CONFIG_PPC64 507 vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64"); 508 #endif 509 vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32"); 510 vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32"); 511 } 512 513 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32, 514 struct lib64_elfinfo *v64) 515 { 516 #ifdef CONFIG_VDSO32 517 Elf32_Sym *sym32; 518 #endif 519 #ifdef CONFIG_PPC64 520 Elf64_Sym *sym64; 521 522 sym64 = find_symbol64(v64, "__kernel_datapage_offset"); 523 if (sym64 == NULL) { 524 printk(KERN_ERR "vDSO64: Can't find symbol " 525 "__kernel_datapage_offset !\n"); 526 return -1; 527 } 528 *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) = 529 (vdso64_pages << PAGE_SHIFT) - 530 (sym64->st_value - VDSO64_LBASE); 531 #endif /* CONFIG_PPC64 */ 532 533 #ifdef CONFIG_VDSO32 534 sym32 = find_symbol32(v32, "__kernel_datapage_offset"); 535 if (sym32 == NULL) { 536 printk(KERN_ERR "vDSO32: Can't find symbol " 537 "__kernel_datapage_offset !\n"); 538 return -1; 539 } 540 *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) = 541 (vdso32_pages << PAGE_SHIFT) - 542 (sym32->st_value - VDSO32_LBASE); 543 #endif 544 545 return 0; 546 } 547 548 549 static __init int vdso_fixup_features(struct lib32_elfinfo *v32, 550 struct lib64_elfinfo *v64) 551 { 552 unsigned long size; 553 void *start; 554 555 #ifdef CONFIG_PPC64 556 start = find_section64(v64->hdr, "__ftr_fixup", &size); 557 if (start) 558 do_feature_fixups(cur_cpu_spec->cpu_features, 559 start, start + size); 560 561 start = find_section64(v64->hdr, "__mmu_ftr_fixup", &size); 562 if (start) 563 do_feature_fixups(cur_cpu_spec->mmu_features, 564 start, start + size); 565 566 start = find_section64(v64->hdr, "__fw_ftr_fixup", &size); 567 if (start) 568 do_feature_fixups(powerpc_firmware_features, 569 start, start + size); 570 571 start = find_section64(v64->hdr, "__lwsync_fixup", &size); 572 if (start) 573 do_lwsync_fixups(cur_cpu_spec->cpu_features, 574 start, start + size); 575 #endif /* CONFIG_PPC64 */ 576 577 #ifdef CONFIG_VDSO32 578 start = find_section32(v32->hdr, "__ftr_fixup", &size); 579 if (start) 580 do_feature_fixups(cur_cpu_spec->cpu_features, 581 start, start + size); 582 583 start = find_section32(v32->hdr, "__mmu_ftr_fixup", &size); 584 if (start) 585 do_feature_fixups(cur_cpu_spec->mmu_features, 586 start, start + size); 587 588 #ifdef CONFIG_PPC64 589 start = find_section32(v32->hdr, "__fw_ftr_fixup", &size); 590 if (start) 591 do_feature_fixups(powerpc_firmware_features, 592 start, start + size); 593 #endif /* CONFIG_PPC64 */ 594 595 start = find_section32(v32->hdr, "__lwsync_fixup", &size); 596 if (start) 597 do_lwsync_fixups(cur_cpu_spec->cpu_features, 598 start, start + size); 599 #endif 600 601 return 0; 602 } 603 604 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32, 605 struct lib64_elfinfo *v64) 606 { 607 int i; 608 609 for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) { 610 struct vdso_patch_def *patch = &vdso_patches[i]; 611 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask) 612 == patch->ftr_value; 613 if (!match) 614 continue; 615 616 DBG("replacing %s with %s...\n", patch->gen_name, 617 patch->fix_name ? "NONE" : patch->fix_name); 618 619 /* 620 * Patch the 32 bits and 64 bits symbols. Note that we do not 621 * patch the "." symbol on 64 bits. 622 * It would be easy to do, but doesn't seem to be necessary, 623 * patching the OPD symbol is enough. 624 */ 625 vdso_do_func_patch32(v32, v64, patch->gen_name, 626 patch->fix_name); 627 #ifdef CONFIG_PPC64 628 vdso_do_func_patch64(v32, v64, patch->gen_name, 629 patch->fix_name); 630 #endif /* CONFIG_PPC64 */ 631 } 632 633 return 0; 634 } 635 636 637 static __init int vdso_setup(void) 638 { 639 struct lib32_elfinfo v32; 640 struct lib64_elfinfo v64; 641 642 v32.hdr = vdso32_kbase; 643 #ifdef CONFIG_PPC64 644 v64.hdr = vdso64_kbase; 645 #endif 646 if (vdso_do_find_sections(&v32, &v64)) 647 return -1; 648 649 if (vdso_fixup_datapage(&v32, &v64)) 650 return -1; 651 652 if (vdso_fixup_features(&v32, &v64)) 653 return -1; 654 655 if (vdso_fixup_alt_funcs(&v32, &v64)) 656 return -1; 657 658 vdso_setup_trampolines(&v32, &v64); 659 660 return 0; 661 } 662 663 /* 664 * Called from setup_arch to initialize the bitmap of available 665 * syscalls in the systemcfg page 666 */ 667 static void __init vdso_setup_syscall_map(void) 668 { 669 unsigned int i; 670 extern unsigned long *sys_call_table; 671 extern unsigned long sys_ni_syscall; 672 673 674 for (i = 0; i < __NR_syscalls; i++) { 675 #ifdef CONFIG_PPC64 676 if (sys_call_table[i*2] != sys_ni_syscall) 677 vdso_data->syscall_map_64[i >> 5] |= 678 0x80000000UL >> (i & 0x1f); 679 if (sys_call_table[i*2+1] != sys_ni_syscall) 680 vdso_data->syscall_map_32[i >> 5] |= 681 0x80000000UL >> (i & 0x1f); 682 #else /* CONFIG_PPC64 */ 683 if (sys_call_table[i] != sys_ni_syscall) 684 vdso_data->syscall_map_32[i >> 5] |= 685 0x80000000UL >> (i & 0x1f); 686 #endif /* CONFIG_PPC64 */ 687 } 688 } 689 690 #ifdef CONFIG_PPC64 691 int vdso_getcpu_init(void) 692 { 693 unsigned long cpu, node, val; 694 695 /* 696 * SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node 697 * in the next 16 bits. The VDSO uses this to implement getcpu(). 698 */ 699 cpu = get_cpu(); 700 WARN_ON_ONCE(cpu > 0xffff); 701 702 node = cpu_to_node(cpu); 703 WARN_ON_ONCE(node > 0xffff); 704 705 val = (cpu & 0xfff) | ((node & 0xffff) << 16); 706 mtspr(SPRN_SPRG_VDSO_WRITE, val); 707 get_paca()->sprg_vdso = val; 708 709 put_cpu(); 710 711 return 0; 712 } 713 /* We need to call this before SMP init */ 714 early_initcall(vdso_getcpu_init); 715 #endif 716 717 static int __init vdso_init(void) 718 { 719 int i; 720 721 #ifdef CONFIG_PPC64 722 /* 723 * Fill up the "systemcfg" stuff for backward compatibility 724 */ 725 strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64"); 726 vdso_data->version.major = SYSTEMCFG_MAJOR; 727 vdso_data->version.minor = SYSTEMCFG_MINOR; 728 vdso_data->processor = mfspr(SPRN_PVR); 729 /* 730 * Fake the old platform number for pSeries and add 731 * in LPAR bit if necessary 732 */ 733 vdso_data->platform = 0x100; 734 if (firmware_has_feature(FW_FEATURE_LPAR)) 735 vdso_data->platform |= 1; 736 vdso_data->physicalMemorySize = memblock_phys_mem_size(); 737 vdso_data->dcache_size = ppc64_caches.dsize; 738 vdso_data->dcache_line_size = ppc64_caches.dline_size; 739 vdso_data->icache_size = ppc64_caches.isize; 740 vdso_data->icache_line_size = ppc64_caches.iline_size; 741 742 /* XXXOJN: Blocks should be added to ppc64_caches and used instead */ 743 vdso_data->dcache_block_size = ppc64_caches.dline_size; 744 vdso_data->icache_block_size = ppc64_caches.iline_size; 745 vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size; 746 vdso_data->icache_log_block_size = ppc64_caches.log_iline_size; 747 748 /* 749 * Calculate the size of the 64 bits vDSO 750 */ 751 vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT; 752 DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages); 753 #else 754 vdso_data->dcache_block_size = L1_CACHE_BYTES; 755 vdso_data->dcache_log_block_size = L1_CACHE_SHIFT; 756 vdso_data->icache_block_size = L1_CACHE_BYTES; 757 vdso_data->icache_log_block_size = L1_CACHE_SHIFT; 758 #endif /* CONFIG_PPC64 */ 759 760 761 #ifdef CONFIG_VDSO32 762 vdso32_kbase = &vdso32_start; 763 764 /* 765 * Calculate the size of the 32 bits vDSO 766 */ 767 vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT; 768 DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages); 769 #endif 770 771 772 /* 773 * Setup the syscall map in the vDOS 774 */ 775 vdso_setup_syscall_map(); 776 777 /* 778 * Initialize the vDSO images in memory, that is do necessary 779 * fixups of vDSO symbols, locate trampolines, etc... 780 */ 781 if (vdso_setup()) { 782 printk(KERN_ERR "vDSO setup failure, not enabled !\n"); 783 vdso32_pages = 0; 784 #ifdef CONFIG_PPC64 785 vdso64_pages = 0; 786 #endif 787 return 0; 788 } 789 790 #ifdef CONFIG_VDSO32 791 /* Make sure pages are in the correct state */ 792 vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2), 793 GFP_KERNEL); 794 BUG_ON(vdso32_pagelist == NULL); 795 for (i = 0; i < vdso32_pages; i++) { 796 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); 797 ClearPageReserved(pg); 798 get_page(pg); 799 vdso32_pagelist[i] = pg; 800 } 801 vdso32_pagelist[i++] = virt_to_page(vdso_data); 802 vdso32_pagelist[i] = NULL; 803 #endif 804 805 #ifdef CONFIG_PPC64 806 vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2), 807 GFP_KERNEL); 808 BUG_ON(vdso64_pagelist == NULL); 809 for (i = 0; i < vdso64_pages; i++) { 810 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); 811 ClearPageReserved(pg); 812 get_page(pg); 813 vdso64_pagelist[i] = pg; 814 } 815 vdso64_pagelist[i++] = virt_to_page(vdso_data); 816 vdso64_pagelist[i] = NULL; 817 #endif /* CONFIG_PPC64 */ 818 819 get_page(virt_to_page(vdso_data)); 820 821 smp_wmb(); 822 vdso_ready = 1; 823 824 return 0; 825 } 826 arch_initcall(vdso_init); 827