1 /* 2 * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org) 3 * 4 * Modifications for ppc64: 5 * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com> 6 * 7 * Copyright 2008 Michael Ellerman, IBM Corporation. 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 #include <linux/types.h> 16 #include <linux/jump_label.h> 17 #include <linux/kernel.h> 18 #include <linux/string.h> 19 #include <linux/init.h> 20 #include <linux/sched/mm.h> 21 #include <asm/cputable.h> 22 #include <asm/code-patching.h> 23 #include <asm/page.h> 24 #include <asm/sections.h> 25 #include <asm/setup.h> 26 #include <asm/security_features.h> 27 #include <asm/firmware.h> 28 29 struct fixup_entry { 30 unsigned long mask; 31 unsigned long value; 32 long start_off; 33 long end_off; 34 long alt_start_off; 35 long alt_end_off; 36 }; 37 38 static unsigned int *calc_addr(struct fixup_entry *fcur, long offset) 39 { 40 /* 41 * We store the offset to the code as a negative offset from 42 * the start of the alt_entry, to support the VDSO. This 43 * routine converts that back into an actual address. 44 */ 45 return (unsigned int *)((unsigned long)fcur + offset); 46 } 47 48 static int patch_alt_instruction(unsigned int *src, unsigned int *dest, 49 unsigned int *alt_start, unsigned int *alt_end) 50 { 51 unsigned int instr; 52 53 instr = *src; 54 55 if (instr_is_relative_branch(*src)) { 56 unsigned int *target = (unsigned int *)branch_target(src); 57 58 /* Branch within the section doesn't need translating */ 59 if (target < alt_start || target > alt_end) { 60 instr = translate_branch(dest, src); 61 if (!instr) 62 return 1; 63 } 64 } 65 66 raw_patch_instruction(dest, instr); 67 68 return 0; 69 } 70 71 static int patch_feature_section(unsigned long value, struct fixup_entry *fcur) 72 { 73 unsigned int *start, *end, *alt_start, *alt_end, *src, *dest; 74 75 start = calc_addr(fcur, fcur->start_off); 76 end = calc_addr(fcur, fcur->end_off); 77 alt_start = calc_addr(fcur, fcur->alt_start_off); 78 alt_end = calc_addr(fcur, fcur->alt_end_off); 79 80 if ((alt_end - alt_start) > (end - start)) 81 return 1; 82 83 if ((value & fcur->mask) == fcur->value) 84 return 0; 85 86 src = alt_start; 87 dest = start; 88 89 for (; src < alt_end; src++, dest++) { 90 if (patch_alt_instruction(src, dest, alt_start, alt_end)) 91 return 1; 92 } 93 94 for (; dest < end; dest++) 95 raw_patch_instruction(dest, PPC_INST_NOP); 96 97 return 0; 98 } 99 100 void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end) 101 { 102 struct fixup_entry *fcur, *fend; 103 104 fcur = fixup_start; 105 fend = fixup_end; 106 107 for (; fcur < fend; fcur++) { 108 if (patch_feature_section(value, fcur)) { 109 WARN_ON(1); 110 printk("Unable to patch feature section at %p - %p" \ 111 " with %p - %p\n", 112 calc_addr(fcur, fcur->start_off), 113 calc_addr(fcur, fcur->end_off), 114 calc_addr(fcur, fcur->alt_start_off), 115 calc_addr(fcur, fcur->alt_end_off)); 116 } 117 } 118 } 119 120 #ifdef CONFIG_PPC_BOOK3S_64 121 void do_stf_entry_barrier_fixups(enum stf_barrier_type types) 122 { 123 unsigned int instrs[3], *dest; 124 long *start, *end; 125 int i; 126 127 start = PTRRELOC(&__start___stf_entry_barrier_fixup), 128 end = PTRRELOC(&__stop___stf_entry_barrier_fixup); 129 130 instrs[0] = 0x60000000; /* nop */ 131 instrs[1] = 0x60000000; /* nop */ 132 instrs[2] = 0x60000000; /* nop */ 133 134 i = 0; 135 if (types & STF_BARRIER_FALLBACK) { 136 instrs[i++] = 0x7d4802a6; /* mflr r10 */ 137 instrs[i++] = 0x60000000; /* branch patched below */ 138 instrs[i++] = 0x7d4803a6; /* mtlr r10 */ 139 } else if (types & STF_BARRIER_EIEIO) { 140 instrs[i++] = 0x7e0006ac; /* eieio + bit 6 hint */ 141 } else if (types & STF_BARRIER_SYNC_ORI) { 142 instrs[i++] = 0x7c0004ac; /* hwsync */ 143 instrs[i++] = 0xe94d0000; /* ld r10,0(r13) */ 144 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */ 145 } 146 147 for (i = 0; start < end; start++, i++) { 148 dest = (void *)start + *start; 149 150 pr_devel("patching dest %lx\n", (unsigned long)dest); 151 152 patch_instruction(dest, instrs[0]); 153 154 if (types & STF_BARRIER_FALLBACK) 155 patch_branch(dest + 1, (unsigned long)&stf_barrier_fallback, 156 BRANCH_SET_LINK); 157 else 158 patch_instruction(dest + 1, instrs[1]); 159 160 patch_instruction(dest + 2, instrs[2]); 161 } 162 163 printk(KERN_DEBUG "stf-barrier: patched %d entry locations (%s barrier)\n", i, 164 (types == STF_BARRIER_NONE) ? "no" : 165 (types == STF_BARRIER_FALLBACK) ? "fallback" : 166 (types == STF_BARRIER_EIEIO) ? "eieio" : 167 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync" 168 : "unknown"); 169 } 170 171 void do_stf_exit_barrier_fixups(enum stf_barrier_type types) 172 { 173 unsigned int instrs[6], *dest; 174 long *start, *end; 175 int i; 176 177 start = PTRRELOC(&__start___stf_exit_barrier_fixup), 178 end = PTRRELOC(&__stop___stf_exit_barrier_fixup); 179 180 instrs[0] = 0x60000000; /* nop */ 181 instrs[1] = 0x60000000; /* nop */ 182 instrs[2] = 0x60000000; /* nop */ 183 instrs[3] = 0x60000000; /* nop */ 184 instrs[4] = 0x60000000; /* nop */ 185 instrs[5] = 0x60000000; /* nop */ 186 187 i = 0; 188 if (types & STF_BARRIER_FALLBACK || types & STF_BARRIER_SYNC_ORI) { 189 if (cpu_has_feature(CPU_FTR_HVMODE)) { 190 instrs[i++] = 0x7db14ba6; /* mtspr 0x131, r13 (HSPRG1) */ 191 instrs[i++] = 0x7db04aa6; /* mfspr r13, 0x130 (HSPRG0) */ 192 } else { 193 instrs[i++] = 0x7db243a6; /* mtsprg 2,r13 */ 194 instrs[i++] = 0x7db142a6; /* mfsprg r13,1 */ 195 } 196 instrs[i++] = 0x7c0004ac; /* hwsync */ 197 instrs[i++] = 0xe9ad0000; /* ld r13,0(r13) */ 198 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */ 199 if (cpu_has_feature(CPU_FTR_HVMODE)) { 200 instrs[i++] = 0x7db14aa6; /* mfspr r13, 0x131 (HSPRG1) */ 201 } else { 202 instrs[i++] = 0x7db242a6; /* mfsprg r13,2 */ 203 } 204 } else if (types & STF_BARRIER_EIEIO) { 205 instrs[i++] = 0x7e0006ac; /* eieio + bit 6 hint */ 206 } 207 208 for (i = 0; start < end; start++, i++) { 209 dest = (void *)start + *start; 210 211 pr_devel("patching dest %lx\n", (unsigned long)dest); 212 213 patch_instruction(dest, instrs[0]); 214 patch_instruction(dest + 1, instrs[1]); 215 patch_instruction(dest + 2, instrs[2]); 216 patch_instruction(dest + 3, instrs[3]); 217 patch_instruction(dest + 4, instrs[4]); 218 patch_instruction(dest + 5, instrs[5]); 219 } 220 printk(KERN_DEBUG "stf-barrier: patched %d exit locations (%s barrier)\n", i, 221 (types == STF_BARRIER_NONE) ? "no" : 222 (types == STF_BARRIER_FALLBACK) ? "fallback" : 223 (types == STF_BARRIER_EIEIO) ? "eieio" : 224 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync" 225 : "unknown"); 226 } 227 228 229 void do_stf_barrier_fixups(enum stf_barrier_type types) 230 { 231 do_stf_entry_barrier_fixups(types); 232 do_stf_exit_barrier_fixups(types); 233 } 234 235 void do_rfi_flush_fixups(enum l1d_flush_type types) 236 { 237 unsigned int instrs[3], *dest; 238 long *start, *end; 239 int i; 240 241 start = PTRRELOC(&__start___rfi_flush_fixup), 242 end = PTRRELOC(&__stop___rfi_flush_fixup); 243 244 instrs[0] = 0x60000000; /* nop */ 245 instrs[1] = 0x60000000; /* nop */ 246 instrs[2] = 0x60000000; /* nop */ 247 248 if (types & L1D_FLUSH_FALLBACK) 249 /* b .+16 to fallback flush */ 250 instrs[0] = 0x48000010; 251 252 i = 0; 253 if (types & L1D_FLUSH_ORI) { 254 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */ 255 instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/ 256 } 257 258 if (types & L1D_FLUSH_MTTRIG) 259 instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */ 260 261 for (i = 0; start < end; start++, i++) { 262 dest = (void *)start + *start; 263 264 pr_devel("patching dest %lx\n", (unsigned long)dest); 265 266 patch_instruction(dest, instrs[0]); 267 patch_instruction(dest + 1, instrs[1]); 268 patch_instruction(dest + 2, instrs[2]); 269 } 270 271 printk(KERN_DEBUG "rfi-flush: patched %d locations (%s flush)\n", i, 272 (types == L1D_FLUSH_NONE) ? "no" : 273 (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" : 274 (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG) 275 ? "ori+mttrig type" 276 : "ori type" : 277 (types & L1D_FLUSH_MTTRIG) ? "mttrig type" 278 : "unknown"); 279 } 280 281 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end) 282 { 283 unsigned int instr, *dest; 284 long *start, *end; 285 int i; 286 287 start = fixup_start; 288 end = fixup_end; 289 290 instr = 0x60000000; /* nop */ 291 292 if (enable) { 293 pr_info("barrier-nospec: using ORI speculation barrier\n"); 294 instr = 0x63ff0000; /* ori 31,31,0 speculation barrier */ 295 } 296 297 for (i = 0; start < end; start++, i++) { 298 dest = (void *)start + *start; 299 300 pr_devel("patching dest %lx\n", (unsigned long)dest); 301 patch_instruction(dest, instr); 302 } 303 304 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i); 305 } 306 307 void do_barrier_nospec_fixups(bool enable) 308 { 309 void *start, *end; 310 311 start = PTRRELOC(&__start___barrier_nospec_fixup), 312 end = PTRRELOC(&__stop___barrier_nospec_fixup); 313 314 do_barrier_nospec_fixups_range(enable, start, end); 315 } 316 317 #endif /* CONFIG_PPC_BOOK3S_64 */ 318 319 void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end) 320 { 321 long *start, *end; 322 unsigned int *dest; 323 324 if (!(value & CPU_FTR_LWSYNC)) 325 return ; 326 327 start = fixup_start; 328 end = fixup_end; 329 330 for (; start < end; start++) { 331 dest = (void *)start + *start; 332 raw_patch_instruction(dest, PPC_INST_LWSYNC); 333 } 334 } 335 336 static void do_final_fixups(void) 337 { 338 #if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE) 339 int *src, *dest; 340 unsigned long length; 341 342 if (PHYSICAL_START == 0) 343 return; 344 345 src = (int *)(KERNELBASE + PHYSICAL_START); 346 dest = (int *)KERNELBASE; 347 length = (__end_interrupts - _stext) / sizeof(int); 348 349 while (length--) { 350 raw_patch_instruction(dest, *src); 351 src++; 352 dest++; 353 } 354 #endif 355 } 356 357 static unsigned long __initdata saved_cpu_features; 358 static unsigned int __initdata saved_mmu_features; 359 #ifdef CONFIG_PPC64 360 static unsigned long __initdata saved_firmware_features; 361 #endif 362 363 void __init apply_feature_fixups(void) 364 { 365 struct cpu_spec *spec = PTRRELOC(*PTRRELOC(&cur_cpu_spec)); 366 367 *PTRRELOC(&saved_cpu_features) = spec->cpu_features; 368 *PTRRELOC(&saved_mmu_features) = spec->mmu_features; 369 370 /* 371 * Apply the CPU-specific and firmware specific fixups to kernel text 372 * (nop out sections not relevant to this CPU or this firmware). 373 */ 374 do_feature_fixups(spec->cpu_features, 375 PTRRELOC(&__start___ftr_fixup), 376 PTRRELOC(&__stop___ftr_fixup)); 377 378 do_feature_fixups(spec->mmu_features, 379 PTRRELOC(&__start___mmu_ftr_fixup), 380 PTRRELOC(&__stop___mmu_ftr_fixup)); 381 382 do_lwsync_fixups(spec->cpu_features, 383 PTRRELOC(&__start___lwsync_fixup), 384 PTRRELOC(&__stop___lwsync_fixup)); 385 386 #ifdef CONFIG_PPC64 387 saved_firmware_features = powerpc_firmware_features; 388 do_feature_fixups(powerpc_firmware_features, 389 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup); 390 #endif 391 do_final_fixups(); 392 } 393 394 void __init setup_feature_keys(void) 395 { 396 /* 397 * Initialise jump label. This causes all the cpu/mmu_has_feature() 398 * checks to take on their correct polarity based on the current set of 399 * CPU/MMU features. 400 */ 401 jump_label_init(); 402 cpu_feature_keys_init(); 403 mmu_feature_keys_init(); 404 } 405 406 static int __init check_features(void) 407 { 408 WARN(saved_cpu_features != cur_cpu_spec->cpu_features, 409 "CPU features changed after feature patching!\n"); 410 WARN(saved_mmu_features != cur_cpu_spec->mmu_features, 411 "MMU features changed after feature patching!\n"); 412 #ifdef CONFIG_PPC64 413 WARN(saved_firmware_features != powerpc_firmware_features, 414 "Firmware features changed after feature patching!\n"); 415 #endif 416 417 return 0; 418 } 419 late_initcall(check_features); 420 421 #ifdef CONFIG_FTR_FIXUP_SELFTEST 422 423 #define check(x) \ 424 if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__); 425 426 /* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */ 427 static struct fixup_entry fixup; 428 429 static long calc_offset(struct fixup_entry *entry, unsigned int *p) 430 { 431 return (unsigned long)p - (unsigned long)entry; 432 } 433 434 static void test_basic_patching(void) 435 { 436 extern unsigned int ftr_fixup_test1[]; 437 extern unsigned int end_ftr_fixup_test1[]; 438 extern unsigned int ftr_fixup_test1_orig[]; 439 extern unsigned int ftr_fixup_test1_expected[]; 440 int size = 4 * (end_ftr_fixup_test1 - ftr_fixup_test1); 441 442 fixup.value = fixup.mask = 8; 443 fixup.start_off = calc_offset(&fixup, ftr_fixup_test1 + 1); 444 fixup.end_off = calc_offset(&fixup, ftr_fixup_test1 + 2); 445 fixup.alt_start_off = fixup.alt_end_off = 0; 446 447 /* Sanity check */ 448 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0); 449 450 /* Check we don't patch if the value matches */ 451 patch_feature_section(8, &fixup); 452 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0); 453 454 /* Check we do patch if the value doesn't match */ 455 patch_feature_section(0, &fixup); 456 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0); 457 458 /* Check we do patch if the mask doesn't match */ 459 memcpy(ftr_fixup_test1, ftr_fixup_test1_orig, size); 460 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0); 461 patch_feature_section(~8, &fixup); 462 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0); 463 } 464 465 static void test_alternative_patching(void) 466 { 467 extern unsigned int ftr_fixup_test2[]; 468 extern unsigned int end_ftr_fixup_test2[]; 469 extern unsigned int ftr_fixup_test2_orig[]; 470 extern unsigned int ftr_fixup_test2_alt[]; 471 extern unsigned int ftr_fixup_test2_expected[]; 472 int size = 4 * (end_ftr_fixup_test2 - ftr_fixup_test2); 473 474 fixup.value = fixup.mask = 0xF; 475 fixup.start_off = calc_offset(&fixup, ftr_fixup_test2 + 1); 476 fixup.end_off = calc_offset(&fixup, ftr_fixup_test2 + 2); 477 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test2_alt); 478 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test2_alt + 1); 479 480 /* Sanity check */ 481 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0); 482 483 /* Check we don't patch if the value matches */ 484 patch_feature_section(0xF, &fixup); 485 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0); 486 487 /* Check we do patch if the value doesn't match */ 488 patch_feature_section(0, &fixup); 489 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0); 490 491 /* Check we do patch if the mask doesn't match */ 492 memcpy(ftr_fixup_test2, ftr_fixup_test2_orig, size); 493 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0); 494 patch_feature_section(~0xF, &fixup); 495 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0); 496 } 497 498 static void test_alternative_case_too_big(void) 499 { 500 extern unsigned int ftr_fixup_test3[]; 501 extern unsigned int end_ftr_fixup_test3[]; 502 extern unsigned int ftr_fixup_test3_orig[]; 503 extern unsigned int ftr_fixup_test3_alt[]; 504 int size = 4 * (end_ftr_fixup_test3 - ftr_fixup_test3); 505 506 fixup.value = fixup.mask = 0xC; 507 fixup.start_off = calc_offset(&fixup, ftr_fixup_test3 + 1); 508 fixup.end_off = calc_offset(&fixup, ftr_fixup_test3 + 2); 509 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test3_alt); 510 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test3_alt + 2); 511 512 /* Sanity check */ 513 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); 514 515 /* Expect nothing to be patched, and the error returned to us */ 516 check(patch_feature_section(0xF, &fixup) == 1); 517 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); 518 check(patch_feature_section(0, &fixup) == 1); 519 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); 520 check(patch_feature_section(~0xF, &fixup) == 1); 521 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); 522 } 523 524 static void test_alternative_case_too_small(void) 525 { 526 extern unsigned int ftr_fixup_test4[]; 527 extern unsigned int end_ftr_fixup_test4[]; 528 extern unsigned int ftr_fixup_test4_orig[]; 529 extern unsigned int ftr_fixup_test4_alt[]; 530 extern unsigned int ftr_fixup_test4_expected[]; 531 int size = 4 * (end_ftr_fixup_test4 - ftr_fixup_test4); 532 unsigned long flag; 533 534 /* Check a high-bit flag */ 535 flag = 1UL << ((sizeof(unsigned long) - 1) * 8); 536 fixup.value = fixup.mask = flag; 537 fixup.start_off = calc_offset(&fixup, ftr_fixup_test4 + 1); 538 fixup.end_off = calc_offset(&fixup, ftr_fixup_test4 + 5); 539 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test4_alt); 540 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test4_alt + 2); 541 542 /* Sanity check */ 543 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0); 544 545 /* Check we don't patch if the value matches */ 546 patch_feature_section(flag, &fixup); 547 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0); 548 549 /* Check we do patch if the value doesn't match */ 550 patch_feature_section(0, &fixup); 551 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0); 552 553 /* Check we do patch if the mask doesn't match */ 554 memcpy(ftr_fixup_test4, ftr_fixup_test4_orig, size); 555 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0); 556 patch_feature_section(~flag, &fixup); 557 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0); 558 } 559 560 static void test_alternative_case_with_branch(void) 561 { 562 extern unsigned int ftr_fixup_test5[]; 563 extern unsigned int end_ftr_fixup_test5[]; 564 extern unsigned int ftr_fixup_test5_expected[]; 565 int size = 4 * (end_ftr_fixup_test5 - ftr_fixup_test5); 566 567 check(memcmp(ftr_fixup_test5, ftr_fixup_test5_expected, size) == 0); 568 } 569 570 static void test_alternative_case_with_external_branch(void) 571 { 572 extern unsigned int ftr_fixup_test6[]; 573 extern unsigned int end_ftr_fixup_test6[]; 574 extern unsigned int ftr_fixup_test6_expected[]; 575 int size = 4 * (end_ftr_fixup_test6 - ftr_fixup_test6); 576 577 check(memcmp(ftr_fixup_test6, ftr_fixup_test6_expected, size) == 0); 578 } 579 580 static void test_alternative_case_with_branch_to_end(void) 581 { 582 extern unsigned int ftr_fixup_test7[]; 583 extern unsigned int end_ftr_fixup_test7[]; 584 extern unsigned int ftr_fixup_test7_expected[]; 585 int size = 4 * (end_ftr_fixup_test7 - ftr_fixup_test7); 586 587 check(memcmp(ftr_fixup_test7, ftr_fixup_test7_expected, size) == 0); 588 } 589 590 static void test_cpu_macros(void) 591 { 592 extern u8 ftr_fixup_test_FTR_macros[]; 593 extern u8 ftr_fixup_test_FTR_macros_expected[]; 594 unsigned long size = ftr_fixup_test_FTR_macros_expected - 595 ftr_fixup_test_FTR_macros; 596 597 /* The fixups have already been done for us during boot */ 598 check(memcmp(ftr_fixup_test_FTR_macros, 599 ftr_fixup_test_FTR_macros_expected, size) == 0); 600 } 601 602 static void test_fw_macros(void) 603 { 604 #ifdef CONFIG_PPC64 605 extern u8 ftr_fixup_test_FW_FTR_macros[]; 606 extern u8 ftr_fixup_test_FW_FTR_macros_expected[]; 607 unsigned long size = ftr_fixup_test_FW_FTR_macros_expected - 608 ftr_fixup_test_FW_FTR_macros; 609 610 /* The fixups have already been done for us during boot */ 611 check(memcmp(ftr_fixup_test_FW_FTR_macros, 612 ftr_fixup_test_FW_FTR_macros_expected, size) == 0); 613 #endif 614 } 615 616 static void test_lwsync_macros(void) 617 { 618 extern u8 lwsync_fixup_test[]; 619 extern u8 end_lwsync_fixup_test[]; 620 extern u8 lwsync_fixup_test_expected_LWSYNC[]; 621 extern u8 lwsync_fixup_test_expected_SYNC[]; 622 unsigned long size = end_lwsync_fixup_test - 623 lwsync_fixup_test; 624 625 /* The fixups have already been done for us during boot */ 626 if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) { 627 check(memcmp(lwsync_fixup_test, 628 lwsync_fixup_test_expected_LWSYNC, size) == 0); 629 } else { 630 check(memcmp(lwsync_fixup_test, 631 lwsync_fixup_test_expected_SYNC, size) == 0); 632 } 633 } 634 635 static int __init test_feature_fixups(void) 636 { 637 printk(KERN_DEBUG "Running feature fixup self-tests ...\n"); 638 639 test_basic_patching(); 640 test_alternative_patching(); 641 test_alternative_case_too_big(); 642 test_alternative_case_too_small(); 643 test_alternative_case_with_branch(); 644 test_alternative_case_with_external_branch(); 645 test_alternative_case_with_branch_to_end(); 646 test_cpu_macros(); 647 test_fw_macros(); 648 test_lwsync_macros(); 649 650 return 0; 651 } 652 late_initcall(test_feature_fixups); 653 654 #endif /* CONFIG_FTR_FIXUP_SELFTEST */ 655