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 extern char vdso32_start, vdso32_end; 53 static void *vdso32_kbase = &vdso32_start; 54 static unsigned int vdso32_pages; 55 static struct page **vdso32_pagelist; 56 unsigned long vdso32_sigtramp; 57 unsigned long vdso32_rt_sigtramp; 58 59 #ifdef CONFIG_PPC64 60 extern char vdso64_start, vdso64_end; 61 static void *vdso64_kbase = &vdso64_start; 62 static unsigned int vdso64_pages; 63 static struct page **vdso64_pagelist; 64 unsigned long vdso64_rt_sigtramp; 65 #endif /* CONFIG_PPC64 */ 66 67 static int vdso_ready; 68 69 /* 70 * The vdso data page (aka. systemcfg for old ppc64 fans) is here. 71 * Once the early boot kernel code no longer needs to muck around 72 * with it, it will become dynamically allocated 73 */ 74 static union { 75 struct vdso_data data; 76 u8 page[PAGE_SIZE]; 77 } vdso_data_store __page_aligned_data; 78 struct vdso_data *vdso_data = &vdso_data_store.data; 79 80 /* Format of the patch table */ 81 struct vdso_patch_def 82 { 83 unsigned long ftr_mask, ftr_value; 84 const char *gen_name; 85 const char *fix_name; 86 }; 87 88 /* Table of functions to patch based on the CPU type/revision 89 * 90 * Currently, we only change sync_dicache to do nothing on processors 91 * with a coherent icache 92 */ 93 static struct vdso_patch_def vdso_patches[] = { 94 { 95 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE, 96 "__kernel_sync_dicache", "__kernel_sync_dicache_p5" 97 }, 98 { 99 CPU_FTR_USE_TB, 0, 100 "__kernel_gettimeofday", NULL 101 }, 102 { 103 CPU_FTR_USE_TB, 0, 104 "__kernel_clock_gettime", NULL 105 }, 106 { 107 CPU_FTR_USE_TB, 0, 108 "__kernel_clock_getres", NULL 109 }, 110 { 111 CPU_FTR_USE_TB, 0, 112 "__kernel_get_tbfreq", NULL 113 }, 114 { 115 CPU_FTR_USE_TB, 0, 116 "__kernel_time", NULL 117 }, 118 }; 119 120 /* 121 * Some infos carried around for each of them during parsing at 122 * boot time. 123 */ 124 struct lib32_elfinfo 125 { 126 Elf32_Ehdr *hdr; /* ptr to ELF */ 127 Elf32_Sym *dynsym; /* ptr to .dynsym section */ 128 unsigned long dynsymsize; /* size of .dynsym section */ 129 char *dynstr; /* ptr to .dynstr section */ 130 unsigned long text; /* offset of .text section in .so */ 131 }; 132 133 struct lib64_elfinfo 134 { 135 Elf64_Ehdr *hdr; 136 Elf64_Sym *dynsym; 137 unsigned long dynsymsize; 138 char *dynstr; 139 unsigned long text; 140 }; 141 142 143 #ifdef __DEBUG 144 static void dump_one_vdso_page(struct page *pg, struct page *upg) 145 { 146 printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT), 147 page_count(pg), 148 pg->flags); 149 if (upg && !IS_ERR(upg) /* && pg != upg*/) { 150 printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg) 151 << PAGE_SHIFT), 152 page_count(upg), 153 upg->flags); 154 } 155 printk("\n"); 156 } 157 158 static void dump_vdso_pages(struct vm_area_struct * vma) 159 { 160 int i; 161 162 if (!vma || is_32bit_task()) { 163 printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase); 164 for (i=0; i<vdso32_pages; i++) { 165 struct page *pg = virt_to_page(vdso32_kbase + 166 i*PAGE_SIZE); 167 struct page *upg = (vma && vma->vm_mm) ? 168 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0) 169 : NULL; 170 dump_one_vdso_page(pg, upg); 171 } 172 } 173 if (!vma || !is_32bit_task()) { 174 printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase); 175 for (i=0; i<vdso64_pages; i++) { 176 struct page *pg = virt_to_page(vdso64_kbase + 177 i*PAGE_SIZE); 178 struct page *upg = (vma && vma->vm_mm) ? 179 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0) 180 : NULL; 181 dump_one_vdso_page(pg, upg); 182 } 183 } 184 } 185 #endif /* DEBUG */ 186 187 /* 188 * This is called from binfmt_elf, we create the special vma for the 189 * vDSO and insert it into the mm struct tree 190 */ 191 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) 192 { 193 struct mm_struct *mm = current->mm; 194 struct page **vdso_pagelist; 195 unsigned long vdso_pages; 196 unsigned long vdso_base; 197 int rc; 198 199 if (!vdso_ready) 200 return 0; 201 202 #ifdef CONFIG_PPC64 203 if (is_32bit_task()) { 204 vdso_pagelist = vdso32_pagelist; 205 vdso_pages = vdso32_pages; 206 vdso_base = VDSO32_MBASE; 207 } else { 208 vdso_pagelist = vdso64_pagelist; 209 vdso_pages = vdso64_pages; 210 /* 211 * On 64bit we don't have a preferred map address. This 212 * allows get_unmapped_area to find an area near other mmaps 213 * and most likely share a SLB entry. 214 */ 215 vdso_base = 0; 216 } 217 #else 218 vdso_pagelist = vdso32_pagelist; 219 vdso_pages = vdso32_pages; 220 vdso_base = VDSO32_MBASE; 221 #endif 222 223 current->mm->context.vdso_base = 0; 224 225 /* vDSO has a problem and was disabled, just don't "enable" it for the 226 * process 227 */ 228 if (vdso_pages == 0) 229 return 0; 230 /* Add a page to the vdso size for the data page */ 231 vdso_pages ++; 232 233 /* 234 * pick a base address for the vDSO in process space. We try to put it 235 * at vdso_base which is the "natural" base for it, but we might fail 236 * and end up putting it elsewhere. 237 * Add enough to the size so that the result can be aligned. 238 */ 239 down_write(&mm->mmap_sem); 240 vdso_base = get_unmapped_area(NULL, vdso_base, 241 (vdso_pages << PAGE_SHIFT) + 242 ((VDSO_ALIGNMENT - 1) & PAGE_MASK), 243 0, 0); 244 if (IS_ERR_VALUE(vdso_base)) { 245 rc = vdso_base; 246 goto fail_mmapsem; 247 } 248 249 /* Add required alignment. */ 250 vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT); 251 252 /* 253 * Put vDSO base into mm struct. We need to do this before calling 254 * install_special_mapping or the perf counter mmap tracking code 255 * will fail to recognise it as a vDSO (since arch_vma_name fails). 256 */ 257 current->mm->context.vdso_base = vdso_base; 258 259 /* 260 * our vma flags don't have VM_WRITE so by default, the process isn't 261 * allowed to write those pages. 262 * gdb can break that with ptrace interface, and thus trigger COW on 263 * those pages but it's then your responsibility to never do that on 264 * the "data" page of the vDSO or you'll stop getting kernel updates 265 * and your nice userland gettimeofday will be totally dead. 266 * It's fine to use that for setting breakpoints in the vDSO code 267 * pages though. 268 */ 269 rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT, 270 VM_READ|VM_EXEC| 271 VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, 272 vdso_pagelist); 273 if (rc) { 274 current->mm->context.vdso_base = 0; 275 goto fail_mmapsem; 276 } 277 278 up_write(&mm->mmap_sem); 279 return 0; 280 281 fail_mmapsem: 282 up_write(&mm->mmap_sem); 283 return rc; 284 } 285 286 const char *arch_vma_name(struct vm_area_struct *vma) 287 { 288 if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base) 289 return "[vdso]"; 290 return NULL; 291 } 292 293 294 295 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname, 296 unsigned long *size) 297 { 298 Elf32_Shdr *sechdrs; 299 unsigned int i; 300 char *secnames; 301 302 /* Grab section headers and strings so we can tell who is who */ 303 sechdrs = (void *)ehdr + ehdr->e_shoff; 304 secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; 305 306 /* Find the section they want */ 307 for (i = 1; i < ehdr->e_shnum; i++) { 308 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { 309 if (size) 310 *size = sechdrs[i].sh_size; 311 return (void *)ehdr + sechdrs[i].sh_offset; 312 } 313 } 314 *size = 0; 315 return NULL; 316 } 317 318 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib, 319 const char *symname) 320 { 321 unsigned int i; 322 char name[MAX_SYMNAME], *c; 323 324 for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) { 325 if (lib->dynsym[i].st_name == 0) 326 continue; 327 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, 328 MAX_SYMNAME); 329 c = strchr(name, '@'); 330 if (c) 331 *c = 0; 332 if (strcmp(symname, name) == 0) 333 return &lib->dynsym[i]; 334 } 335 return NULL; 336 } 337 338 /* Note that we assume the section is .text and the symbol is relative to 339 * the library base 340 */ 341 static unsigned long __init find_function32(struct lib32_elfinfo *lib, 342 const char *symname) 343 { 344 Elf32_Sym *sym = find_symbol32(lib, symname); 345 346 if (sym == NULL) { 347 printk(KERN_WARNING "vDSO32: function %s not found !\n", 348 symname); 349 return 0; 350 } 351 return sym->st_value - VDSO32_LBASE; 352 } 353 354 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32, 355 struct lib64_elfinfo *v64, 356 const char *orig, const char *fix) 357 { 358 Elf32_Sym *sym32_gen, *sym32_fix; 359 360 sym32_gen = find_symbol32(v32, orig); 361 if (sym32_gen == NULL) { 362 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig); 363 return -1; 364 } 365 if (fix == NULL) { 366 sym32_gen->st_name = 0; 367 return 0; 368 } 369 sym32_fix = find_symbol32(v32, fix); 370 if (sym32_fix == NULL) { 371 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix); 372 return -1; 373 } 374 sym32_gen->st_value = sym32_fix->st_value; 375 sym32_gen->st_size = sym32_fix->st_size; 376 sym32_gen->st_info = sym32_fix->st_info; 377 sym32_gen->st_other = sym32_fix->st_other; 378 sym32_gen->st_shndx = sym32_fix->st_shndx; 379 380 return 0; 381 } 382 383 384 #ifdef CONFIG_PPC64 385 386 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname, 387 unsigned long *size) 388 { 389 Elf64_Shdr *sechdrs; 390 unsigned int i; 391 char *secnames; 392 393 /* Grab section headers and strings so we can tell who is who */ 394 sechdrs = (void *)ehdr + ehdr->e_shoff; 395 secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; 396 397 /* Find the section they want */ 398 for (i = 1; i < ehdr->e_shnum; i++) { 399 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { 400 if (size) 401 *size = sechdrs[i].sh_size; 402 return (void *)ehdr + sechdrs[i].sh_offset; 403 } 404 } 405 if (size) 406 *size = 0; 407 return NULL; 408 } 409 410 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib, 411 const char *symname) 412 { 413 unsigned int i; 414 char name[MAX_SYMNAME], *c; 415 416 for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) { 417 if (lib->dynsym[i].st_name == 0) 418 continue; 419 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, 420 MAX_SYMNAME); 421 c = strchr(name, '@'); 422 if (c) 423 *c = 0; 424 if (strcmp(symname, name) == 0) 425 return &lib->dynsym[i]; 426 } 427 return NULL; 428 } 429 430 /* Note that we assume the section is .text and the symbol is relative to 431 * the library base 432 */ 433 static unsigned long __init find_function64(struct lib64_elfinfo *lib, 434 const char *symname) 435 { 436 Elf64_Sym *sym = find_symbol64(lib, symname); 437 438 if (sym == NULL) { 439 printk(KERN_WARNING "vDSO64: function %s not found !\n", 440 symname); 441 return 0; 442 } 443 #ifdef VDS64_HAS_DESCRIPTORS 444 return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) - 445 VDSO64_LBASE; 446 #else 447 return sym->st_value - VDSO64_LBASE; 448 #endif 449 } 450 451 static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32, 452 struct lib64_elfinfo *v64, 453 const char *orig, const char *fix) 454 { 455 Elf64_Sym *sym64_gen, *sym64_fix; 456 457 sym64_gen = find_symbol64(v64, orig); 458 if (sym64_gen == NULL) { 459 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig); 460 return -1; 461 } 462 if (fix == NULL) { 463 sym64_gen->st_name = 0; 464 return 0; 465 } 466 sym64_fix = find_symbol64(v64, fix); 467 if (sym64_fix == NULL) { 468 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix); 469 return -1; 470 } 471 sym64_gen->st_value = sym64_fix->st_value; 472 sym64_gen->st_size = sym64_fix->st_size; 473 sym64_gen->st_info = sym64_fix->st_info; 474 sym64_gen->st_other = sym64_fix->st_other; 475 sym64_gen->st_shndx = sym64_fix->st_shndx; 476 477 return 0; 478 } 479 480 #endif /* CONFIG_PPC64 */ 481 482 483 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32, 484 struct lib64_elfinfo *v64) 485 { 486 void *sect; 487 488 /* 489 * Locate symbol tables & text section 490 */ 491 492 v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize); 493 v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL); 494 if (v32->dynsym == NULL || v32->dynstr == NULL) { 495 printk(KERN_ERR "vDSO32: required symbol section not found\n"); 496 return -1; 497 } 498 sect = find_section32(v32->hdr, ".text", NULL); 499 if (sect == NULL) { 500 printk(KERN_ERR "vDSO32: the .text section was not found\n"); 501 return -1; 502 } 503 v32->text = sect - vdso32_kbase; 504 505 #ifdef CONFIG_PPC64 506 v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize); 507 v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL); 508 if (v64->dynsym == NULL || v64->dynstr == NULL) { 509 printk(KERN_ERR "vDSO64: required symbol section not found\n"); 510 return -1; 511 } 512 sect = find_section64(v64->hdr, ".text", NULL); 513 if (sect == NULL) { 514 printk(KERN_ERR "vDSO64: the .text section was not found\n"); 515 return -1; 516 } 517 v64->text = sect - vdso64_kbase; 518 #endif /* CONFIG_PPC64 */ 519 520 return 0; 521 } 522 523 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32, 524 struct lib64_elfinfo *v64) 525 { 526 /* 527 * Find signal trampolines 528 */ 529 530 #ifdef CONFIG_PPC64 531 vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64"); 532 #endif 533 vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32"); 534 vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32"); 535 } 536 537 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32, 538 struct lib64_elfinfo *v64) 539 { 540 Elf32_Sym *sym32; 541 #ifdef CONFIG_PPC64 542 Elf64_Sym *sym64; 543 544 sym64 = find_symbol64(v64, "__kernel_datapage_offset"); 545 if (sym64 == NULL) { 546 printk(KERN_ERR "vDSO64: Can't find symbol " 547 "__kernel_datapage_offset !\n"); 548 return -1; 549 } 550 *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) = 551 (vdso64_pages << PAGE_SHIFT) - 552 (sym64->st_value - VDSO64_LBASE); 553 #endif /* CONFIG_PPC64 */ 554 555 sym32 = find_symbol32(v32, "__kernel_datapage_offset"); 556 if (sym32 == NULL) { 557 printk(KERN_ERR "vDSO32: Can't find symbol " 558 "__kernel_datapage_offset !\n"); 559 return -1; 560 } 561 *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) = 562 (vdso32_pages << PAGE_SHIFT) - 563 (sym32->st_value - VDSO32_LBASE); 564 565 return 0; 566 } 567 568 569 static __init int vdso_fixup_features(struct lib32_elfinfo *v32, 570 struct lib64_elfinfo *v64) 571 { 572 void *start32; 573 unsigned long size32; 574 575 #ifdef CONFIG_PPC64 576 void *start64; 577 unsigned long size64; 578 579 start64 = find_section64(v64->hdr, "__ftr_fixup", &size64); 580 if (start64) 581 do_feature_fixups(cur_cpu_spec->cpu_features, 582 start64, start64 + size64); 583 584 start64 = find_section64(v64->hdr, "__mmu_ftr_fixup", &size64); 585 if (start64) 586 do_feature_fixups(cur_cpu_spec->mmu_features, 587 start64, start64 + size64); 588 589 start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64); 590 if (start64) 591 do_feature_fixups(powerpc_firmware_features, 592 start64, start64 + size64); 593 594 start64 = find_section64(v64->hdr, "__lwsync_fixup", &size64); 595 if (start64) 596 do_lwsync_fixups(cur_cpu_spec->cpu_features, 597 start64, start64 + size64); 598 #endif /* CONFIG_PPC64 */ 599 600 start32 = find_section32(v32->hdr, "__ftr_fixup", &size32); 601 if (start32) 602 do_feature_fixups(cur_cpu_spec->cpu_features, 603 start32, start32 + size32); 604 605 start32 = find_section32(v32->hdr, "__mmu_ftr_fixup", &size32); 606 if (start32) 607 do_feature_fixups(cur_cpu_spec->mmu_features, 608 start32, start32 + size32); 609 610 #ifdef CONFIG_PPC64 611 start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32); 612 if (start32) 613 do_feature_fixups(powerpc_firmware_features, 614 start32, start32 + size32); 615 #endif /* CONFIG_PPC64 */ 616 617 start32 = find_section32(v32->hdr, "__lwsync_fixup", &size32); 618 if (start32) 619 do_lwsync_fixups(cur_cpu_spec->cpu_features, 620 start32, start32 + size32); 621 622 return 0; 623 } 624 625 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32, 626 struct lib64_elfinfo *v64) 627 { 628 int i; 629 630 for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) { 631 struct vdso_patch_def *patch = &vdso_patches[i]; 632 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask) 633 == patch->ftr_value; 634 if (!match) 635 continue; 636 637 DBG("replacing %s with %s...\n", patch->gen_name, 638 patch->fix_name ? "NONE" : patch->fix_name); 639 640 /* 641 * Patch the 32 bits and 64 bits symbols. Note that we do not 642 * patch the "." symbol on 64 bits. 643 * It would be easy to do, but doesn't seem to be necessary, 644 * patching the OPD symbol is enough. 645 */ 646 vdso_do_func_patch32(v32, v64, patch->gen_name, 647 patch->fix_name); 648 #ifdef CONFIG_PPC64 649 vdso_do_func_patch64(v32, v64, patch->gen_name, 650 patch->fix_name); 651 #endif /* CONFIG_PPC64 */ 652 } 653 654 return 0; 655 } 656 657 658 static __init int vdso_setup(void) 659 { 660 struct lib32_elfinfo v32; 661 struct lib64_elfinfo v64; 662 663 v32.hdr = vdso32_kbase; 664 #ifdef CONFIG_PPC64 665 v64.hdr = vdso64_kbase; 666 #endif 667 if (vdso_do_find_sections(&v32, &v64)) 668 return -1; 669 670 if (vdso_fixup_datapage(&v32, &v64)) 671 return -1; 672 673 if (vdso_fixup_features(&v32, &v64)) 674 return -1; 675 676 if (vdso_fixup_alt_funcs(&v32, &v64)) 677 return -1; 678 679 vdso_setup_trampolines(&v32, &v64); 680 681 return 0; 682 } 683 684 /* 685 * Called from setup_arch to initialize the bitmap of available 686 * syscalls in the systemcfg page 687 */ 688 static void __init vdso_setup_syscall_map(void) 689 { 690 unsigned int i; 691 extern unsigned long *sys_call_table; 692 extern unsigned long sys_ni_syscall; 693 694 695 for (i = 0; i < __NR_syscalls; i++) { 696 #ifdef CONFIG_PPC64 697 if (sys_call_table[i*2] != sys_ni_syscall) 698 vdso_data->syscall_map_64[i >> 5] |= 699 0x80000000UL >> (i & 0x1f); 700 if (sys_call_table[i*2+1] != sys_ni_syscall) 701 vdso_data->syscall_map_32[i >> 5] |= 702 0x80000000UL >> (i & 0x1f); 703 #else /* CONFIG_PPC64 */ 704 if (sys_call_table[i] != sys_ni_syscall) 705 vdso_data->syscall_map_32[i >> 5] |= 706 0x80000000UL >> (i & 0x1f); 707 #endif /* CONFIG_PPC64 */ 708 } 709 } 710 711 #ifdef CONFIG_PPC64 712 int vdso_getcpu_init(void) 713 { 714 unsigned long cpu, node, val; 715 716 /* 717 * SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node 718 * in the next 16 bits. The VDSO uses this to implement getcpu(). 719 */ 720 cpu = get_cpu(); 721 WARN_ON_ONCE(cpu > 0xffff); 722 723 node = cpu_to_node(cpu); 724 WARN_ON_ONCE(node > 0xffff); 725 726 val = (cpu & 0xfff) | ((node & 0xffff) << 16); 727 mtspr(SPRN_SPRG_VDSO_WRITE, val); 728 get_paca()->sprg_vdso = val; 729 730 put_cpu(); 731 732 return 0; 733 } 734 /* We need to call this before SMP init */ 735 early_initcall(vdso_getcpu_init); 736 #endif 737 738 static int __init vdso_init(void) 739 { 740 int i; 741 742 #ifdef CONFIG_PPC64 743 /* 744 * Fill up the "systemcfg" stuff for backward compatibility 745 */ 746 strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64"); 747 vdso_data->version.major = SYSTEMCFG_MAJOR; 748 vdso_data->version.minor = SYSTEMCFG_MINOR; 749 vdso_data->processor = mfspr(SPRN_PVR); 750 /* 751 * Fake the old platform number for pSeries and add 752 * in LPAR bit if necessary 753 */ 754 vdso_data->platform = 0x100; 755 if (firmware_has_feature(FW_FEATURE_LPAR)) 756 vdso_data->platform |= 1; 757 vdso_data->physicalMemorySize = memblock_phys_mem_size(); 758 vdso_data->dcache_size = ppc64_caches.dsize; 759 vdso_data->dcache_line_size = ppc64_caches.dline_size; 760 vdso_data->icache_size = ppc64_caches.isize; 761 vdso_data->icache_line_size = ppc64_caches.iline_size; 762 763 /* XXXOJN: Blocks should be added to ppc64_caches and used instead */ 764 vdso_data->dcache_block_size = ppc64_caches.dline_size; 765 vdso_data->icache_block_size = ppc64_caches.iline_size; 766 vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size; 767 vdso_data->icache_log_block_size = ppc64_caches.log_iline_size; 768 769 /* 770 * Calculate the size of the 64 bits vDSO 771 */ 772 vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT; 773 DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages); 774 #else 775 vdso_data->dcache_block_size = L1_CACHE_BYTES; 776 vdso_data->dcache_log_block_size = L1_CACHE_SHIFT; 777 vdso_data->icache_block_size = L1_CACHE_BYTES; 778 vdso_data->icache_log_block_size = L1_CACHE_SHIFT; 779 #endif /* CONFIG_PPC64 */ 780 781 782 /* 783 * Calculate the size of the 32 bits vDSO 784 */ 785 vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT; 786 DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages); 787 788 789 /* 790 * Setup the syscall map in the vDOS 791 */ 792 vdso_setup_syscall_map(); 793 794 /* 795 * Initialize the vDSO images in memory, that is do necessary 796 * fixups of vDSO symbols, locate trampolines, etc... 797 */ 798 if (vdso_setup()) { 799 printk(KERN_ERR "vDSO setup failure, not enabled !\n"); 800 vdso32_pages = 0; 801 #ifdef CONFIG_PPC64 802 vdso64_pages = 0; 803 #endif 804 return 0; 805 } 806 807 /* Make sure pages are in the correct state */ 808 vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2), 809 GFP_KERNEL); 810 BUG_ON(vdso32_pagelist == NULL); 811 for (i = 0; i < vdso32_pages; i++) { 812 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); 813 ClearPageReserved(pg); 814 get_page(pg); 815 vdso32_pagelist[i] = pg; 816 } 817 vdso32_pagelist[i++] = virt_to_page(vdso_data); 818 vdso32_pagelist[i] = NULL; 819 820 #ifdef CONFIG_PPC64 821 vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2), 822 GFP_KERNEL); 823 BUG_ON(vdso64_pagelist == NULL); 824 for (i = 0; i < vdso64_pages; i++) { 825 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); 826 ClearPageReserved(pg); 827 get_page(pg); 828 vdso64_pagelist[i] = pg; 829 } 830 vdso64_pagelist[i++] = virt_to_page(vdso_data); 831 vdso64_pagelist[i] = NULL; 832 #endif /* CONFIG_PPC64 */ 833 834 get_page(virt_to_page(vdso_data)); 835 836 smp_wmb(); 837 vdso_ready = 1; 838 839 return 0; 840 } 841 arch_initcall(vdso_init); 842