1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Processor capabilities determination functions. 4 * 5 * Copyright (C) xxxx the Anonymous 6 * Copyright (C) 1994 - 2006 Ralf Baechle 7 * Copyright (C) 2003, 2004 Maciej W. Rozycki 8 * Copyright (C) 2001, 2004, 2011, 2012 MIPS Technologies, Inc. 9 */ 10 #include <linux/init.h> 11 #include <linux/kernel.h> 12 #include <linux/ptrace.h> 13 #include <linux/smp.h> 14 #include <linux/stddef.h> 15 #include <linux/export.h> 16 17 #include <asm/bugs.h> 18 #include <asm/cpu.h> 19 #include <asm/cpu-features.h> 20 #include <asm/cpu-type.h> 21 #include <asm/fpu.h> 22 #include <asm/mipsregs.h> 23 #include <asm/mipsmtregs.h> 24 #include <asm/msa.h> 25 #include <asm/watch.h> 26 #include <asm/elf.h> 27 #include <asm/pgtable-bits.h> 28 #include <asm/spram.h> 29 #include <linux/uaccess.h> 30 31 /* Hardware capabilities */ 32 unsigned int elf_hwcap __read_mostly; 33 EXPORT_SYMBOL_GPL(elf_hwcap); 34 35 #ifdef CONFIG_MIPS_FP_SUPPORT 36 37 /* 38 * Get the FPU Implementation/Revision. 39 */ 40 static inline unsigned long cpu_get_fpu_id(void) 41 { 42 unsigned long tmp, fpu_id; 43 44 tmp = read_c0_status(); 45 __enable_fpu(FPU_AS_IS); 46 fpu_id = read_32bit_cp1_register(CP1_REVISION); 47 write_c0_status(tmp); 48 return fpu_id; 49 } 50 51 /* 52 * Check if the CPU has an external FPU. 53 */ 54 static inline int __cpu_has_fpu(void) 55 { 56 return (cpu_get_fpu_id() & FPIR_IMP_MASK) != FPIR_IMP_NONE; 57 } 58 59 /* 60 * Determine the FCSR mask for FPU hardware. 61 */ 62 static inline void cpu_set_fpu_fcsr_mask(struct cpuinfo_mips *c) 63 { 64 unsigned long sr, mask, fcsr, fcsr0, fcsr1; 65 66 fcsr = c->fpu_csr31; 67 mask = FPU_CSR_ALL_X | FPU_CSR_ALL_E | FPU_CSR_ALL_S | FPU_CSR_RM; 68 69 sr = read_c0_status(); 70 __enable_fpu(FPU_AS_IS); 71 72 fcsr0 = fcsr & mask; 73 write_32bit_cp1_register(CP1_STATUS, fcsr0); 74 fcsr0 = read_32bit_cp1_register(CP1_STATUS); 75 76 fcsr1 = fcsr | ~mask; 77 write_32bit_cp1_register(CP1_STATUS, fcsr1); 78 fcsr1 = read_32bit_cp1_register(CP1_STATUS); 79 80 write_32bit_cp1_register(CP1_STATUS, fcsr); 81 82 write_c0_status(sr); 83 84 c->fpu_msk31 = ~(fcsr0 ^ fcsr1) & ~mask; 85 } 86 87 /* 88 * Determine the IEEE 754 NaN encodings and ABS.fmt/NEG.fmt execution modes 89 * supported by FPU hardware. 90 */ 91 static void cpu_set_fpu_2008(struct cpuinfo_mips *c) 92 { 93 if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 | 94 MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 | 95 MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) { 96 unsigned long sr, fir, fcsr, fcsr0, fcsr1; 97 98 sr = read_c0_status(); 99 __enable_fpu(FPU_AS_IS); 100 101 fir = read_32bit_cp1_register(CP1_REVISION); 102 if (fir & MIPS_FPIR_HAS2008) { 103 fcsr = read_32bit_cp1_register(CP1_STATUS); 104 105 fcsr0 = fcsr & ~(FPU_CSR_ABS2008 | FPU_CSR_NAN2008); 106 write_32bit_cp1_register(CP1_STATUS, fcsr0); 107 fcsr0 = read_32bit_cp1_register(CP1_STATUS); 108 109 fcsr1 = fcsr | FPU_CSR_ABS2008 | FPU_CSR_NAN2008; 110 write_32bit_cp1_register(CP1_STATUS, fcsr1); 111 fcsr1 = read_32bit_cp1_register(CP1_STATUS); 112 113 write_32bit_cp1_register(CP1_STATUS, fcsr); 114 115 if (!(fcsr0 & FPU_CSR_NAN2008)) 116 c->options |= MIPS_CPU_NAN_LEGACY; 117 if (fcsr1 & FPU_CSR_NAN2008) 118 c->options |= MIPS_CPU_NAN_2008; 119 120 if ((fcsr0 ^ fcsr1) & FPU_CSR_ABS2008) 121 c->fpu_msk31 &= ~FPU_CSR_ABS2008; 122 else 123 c->fpu_csr31 |= fcsr & FPU_CSR_ABS2008; 124 125 if ((fcsr0 ^ fcsr1) & FPU_CSR_NAN2008) 126 c->fpu_msk31 &= ~FPU_CSR_NAN2008; 127 else 128 c->fpu_csr31 |= fcsr & FPU_CSR_NAN2008; 129 } else { 130 c->options |= MIPS_CPU_NAN_LEGACY; 131 } 132 133 write_c0_status(sr); 134 } else { 135 c->options |= MIPS_CPU_NAN_LEGACY; 136 } 137 } 138 139 /* 140 * IEEE 754 conformance mode to use. Affects the NaN encoding and the 141 * ABS.fmt/NEG.fmt execution mode. 142 */ 143 static enum { STRICT, LEGACY, STD2008, RELAXED } ieee754 = STRICT; 144 145 /* 146 * Set the IEEE 754 NaN encodings and the ABS.fmt/NEG.fmt execution modes 147 * to support by the FPU emulator according to the IEEE 754 conformance 148 * mode selected. Note that "relaxed" straps the emulator so that it 149 * allows 2008-NaN binaries even for legacy processors. 150 */ 151 static void cpu_set_nofpu_2008(struct cpuinfo_mips *c) 152 { 153 c->options &= ~(MIPS_CPU_NAN_2008 | MIPS_CPU_NAN_LEGACY); 154 c->fpu_csr31 &= ~(FPU_CSR_ABS2008 | FPU_CSR_NAN2008); 155 c->fpu_msk31 &= ~(FPU_CSR_ABS2008 | FPU_CSR_NAN2008); 156 157 switch (ieee754) { 158 case STRICT: 159 if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 | 160 MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 | 161 MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) { 162 c->options |= MIPS_CPU_NAN_2008 | MIPS_CPU_NAN_LEGACY; 163 } else { 164 c->options |= MIPS_CPU_NAN_LEGACY; 165 c->fpu_msk31 |= FPU_CSR_ABS2008 | FPU_CSR_NAN2008; 166 } 167 break; 168 case LEGACY: 169 c->options |= MIPS_CPU_NAN_LEGACY; 170 c->fpu_msk31 |= FPU_CSR_ABS2008 | FPU_CSR_NAN2008; 171 break; 172 case STD2008: 173 c->options |= MIPS_CPU_NAN_2008; 174 c->fpu_csr31 |= FPU_CSR_ABS2008 | FPU_CSR_NAN2008; 175 c->fpu_msk31 |= FPU_CSR_ABS2008 | FPU_CSR_NAN2008; 176 break; 177 case RELAXED: 178 c->options |= MIPS_CPU_NAN_2008 | MIPS_CPU_NAN_LEGACY; 179 break; 180 } 181 } 182 183 /* 184 * Override the IEEE 754 NaN encoding and ABS.fmt/NEG.fmt execution mode 185 * according to the "ieee754=" parameter. 186 */ 187 static void cpu_set_nan_2008(struct cpuinfo_mips *c) 188 { 189 switch (ieee754) { 190 case STRICT: 191 mips_use_nan_legacy = !!cpu_has_nan_legacy; 192 mips_use_nan_2008 = !!cpu_has_nan_2008; 193 break; 194 case LEGACY: 195 mips_use_nan_legacy = !!cpu_has_nan_legacy; 196 mips_use_nan_2008 = !cpu_has_nan_legacy; 197 break; 198 case STD2008: 199 mips_use_nan_legacy = !cpu_has_nan_2008; 200 mips_use_nan_2008 = !!cpu_has_nan_2008; 201 break; 202 case RELAXED: 203 mips_use_nan_legacy = true; 204 mips_use_nan_2008 = true; 205 break; 206 } 207 } 208 209 /* 210 * IEEE 754 NaN encoding and ABS.fmt/NEG.fmt execution mode override 211 * settings: 212 * 213 * strict: accept binaries that request a NaN encoding supported by the FPU 214 * legacy: only accept legacy-NaN binaries 215 * 2008: only accept 2008-NaN binaries 216 * relaxed: accept any binaries regardless of whether supported by the FPU 217 */ 218 static int __init ieee754_setup(char *s) 219 { 220 if (!s) 221 return -1; 222 else if (!strcmp(s, "strict")) 223 ieee754 = STRICT; 224 else if (!strcmp(s, "legacy")) 225 ieee754 = LEGACY; 226 else if (!strcmp(s, "2008")) 227 ieee754 = STD2008; 228 else if (!strcmp(s, "relaxed")) 229 ieee754 = RELAXED; 230 else 231 return -1; 232 233 if (!(boot_cpu_data.options & MIPS_CPU_FPU)) 234 cpu_set_nofpu_2008(&boot_cpu_data); 235 cpu_set_nan_2008(&boot_cpu_data); 236 237 return 0; 238 } 239 240 early_param("ieee754", ieee754_setup); 241 242 /* 243 * Set the FIR feature flags for the FPU emulator. 244 */ 245 static void cpu_set_nofpu_id(struct cpuinfo_mips *c) 246 { 247 u32 value; 248 249 value = 0; 250 if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 | 251 MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 | 252 MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) 253 value |= MIPS_FPIR_D | MIPS_FPIR_S; 254 if (c->isa_level & (MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 | 255 MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) 256 value |= MIPS_FPIR_F64 | MIPS_FPIR_L | MIPS_FPIR_W; 257 if (c->options & MIPS_CPU_NAN_2008) 258 value |= MIPS_FPIR_HAS2008; 259 c->fpu_id = value; 260 } 261 262 /* Determined FPU emulator mask to use for the boot CPU with "nofpu". */ 263 static unsigned int mips_nofpu_msk31; 264 265 /* 266 * Set options for FPU hardware. 267 */ 268 static void cpu_set_fpu_opts(struct cpuinfo_mips *c) 269 { 270 c->fpu_id = cpu_get_fpu_id(); 271 mips_nofpu_msk31 = c->fpu_msk31; 272 273 if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 | 274 MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 | 275 MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) { 276 if (c->fpu_id & MIPS_FPIR_3D) 277 c->ases |= MIPS_ASE_MIPS3D; 278 if (c->fpu_id & MIPS_FPIR_UFRP) 279 c->options |= MIPS_CPU_UFR; 280 if (c->fpu_id & MIPS_FPIR_FREP) 281 c->options |= MIPS_CPU_FRE; 282 } 283 284 cpu_set_fpu_fcsr_mask(c); 285 cpu_set_fpu_2008(c); 286 cpu_set_nan_2008(c); 287 } 288 289 /* 290 * Set options for the FPU emulator. 291 */ 292 static void cpu_set_nofpu_opts(struct cpuinfo_mips *c) 293 { 294 c->options &= ~MIPS_CPU_FPU; 295 c->fpu_msk31 = mips_nofpu_msk31; 296 297 cpu_set_nofpu_2008(c); 298 cpu_set_nan_2008(c); 299 cpu_set_nofpu_id(c); 300 } 301 302 static int mips_fpu_disabled; 303 304 static int __init fpu_disable(char *s) 305 { 306 cpu_set_nofpu_opts(&boot_cpu_data); 307 mips_fpu_disabled = 1; 308 309 return 1; 310 } 311 312 __setup("nofpu", fpu_disable); 313 314 #else /* !CONFIG_MIPS_FP_SUPPORT */ 315 316 #define mips_fpu_disabled 1 317 318 static inline unsigned long cpu_get_fpu_id(void) 319 { 320 return FPIR_IMP_NONE; 321 } 322 323 static inline int __cpu_has_fpu(void) 324 { 325 return 0; 326 } 327 328 static void cpu_set_fpu_opts(struct cpuinfo_mips *c) 329 { 330 /* no-op */ 331 } 332 333 static void cpu_set_nofpu_opts(struct cpuinfo_mips *c) 334 { 335 /* no-op */ 336 } 337 338 #endif /* CONFIG_MIPS_FP_SUPPORT */ 339 340 static inline unsigned long cpu_get_msa_id(void) 341 { 342 unsigned long status, msa_id; 343 344 status = read_c0_status(); 345 __enable_fpu(FPU_64BIT); 346 enable_msa(); 347 msa_id = read_msa_ir(); 348 disable_msa(); 349 write_c0_status(status); 350 return msa_id; 351 } 352 353 static int mips_dsp_disabled; 354 355 static int __init dsp_disable(char *s) 356 { 357 cpu_data[0].ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P); 358 mips_dsp_disabled = 1; 359 360 return 1; 361 } 362 363 __setup("nodsp", dsp_disable); 364 365 static int mips_htw_disabled; 366 367 static int __init htw_disable(char *s) 368 { 369 mips_htw_disabled = 1; 370 cpu_data[0].options &= ~MIPS_CPU_HTW; 371 write_c0_pwctl(read_c0_pwctl() & 372 ~(1 << MIPS_PWCTL_PWEN_SHIFT)); 373 374 return 1; 375 } 376 377 __setup("nohtw", htw_disable); 378 379 static int mips_ftlb_disabled; 380 static int mips_has_ftlb_configured; 381 382 enum ftlb_flags { 383 FTLB_EN = 1 << 0, 384 FTLB_SET_PROB = 1 << 1, 385 }; 386 387 static int set_ftlb_enable(struct cpuinfo_mips *c, enum ftlb_flags flags); 388 389 static int __init ftlb_disable(char *s) 390 { 391 unsigned int config4, mmuextdef; 392 393 /* 394 * If the core hasn't done any FTLB configuration, there is nothing 395 * for us to do here. 396 */ 397 if (!mips_has_ftlb_configured) 398 return 1; 399 400 /* Disable it in the boot cpu */ 401 if (set_ftlb_enable(&cpu_data[0], 0)) { 402 pr_warn("Can't turn FTLB off\n"); 403 return 1; 404 } 405 406 config4 = read_c0_config4(); 407 408 /* Check that FTLB has been disabled */ 409 mmuextdef = config4 & MIPS_CONF4_MMUEXTDEF; 410 /* MMUSIZEEXT == VTLB ON, FTLB OFF */ 411 if (mmuextdef == MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT) { 412 /* This should never happen */ 413 pr_warn("FTLB could not be disabled!\n"); 414 return 1; 415 } 416 417 mips_ftlb_disabled = 1; 418 mips_has_ftlb_configured = 0; 419 420 /* 421 * noftlb is mainly used for debug purposes so print 422 * an informative message instead of using pr_debug() 423 */ 424 pr_info("FTLB has been disabled\n"); 425 426 /* 427 * Some of these bits are duplicated in the decode_config4. 428 * MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT is the only possible case 429 * once FTLB has been disabled so undo what decode_config4 did. 430 */ 431 cpu_data[0].tlbsize -= cpu_data[0].tlbsizeftlbways * 432 cpu_data[0].tlbsizeftlbsets; 433 cpu_data[0].tlbsizeftlbsets = 0; 434 cpu_data[0].tlbsizeftlbways = 0; 435 436 return 1; 437 } 438 439 __setup("noftlb", ftlb_disable); 440 441 /* 442 * Check if the CPU has per tc perf counters 443 */ 444 static inline void cpu_set_mt_per_tc_perf(struct cpuinfo_mips *c) 445 { 446 if (read_c0_config7() & MTI_CONF7_PTC) 447 c->options |= MIPS_CPU_MT_PER_TC_PERF_COUNTERS; 448 } 449 450 static inline void check_errata(void) 451 { 452 struct cpuinfo_mips *c = ¤t_cpu_data; 453 454 switch (current_cpu_type()) { 455 case CPU_34K: 456 /* 457 * Erratum "RPS May Cause Incorrect Instruction Execution" 458 * This code only handles VPE0, any SMP/RTOS code 459 * making use of VPE1 will be responsable for that VPE. 460 */ 461 if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_34K_V1_0_2) 462 write_c0_config7(read_c0_config7() | MIPS_CONF7_RPS); 463 break; 464 default: 465 break; 466 } 467 } 468 469 void __init check_bugs32(void) 470 { 471 check_errata(); 472 } 473 474 /* 475 * Probe whether cpu has config register by trying to play with 476 * alternate cache bit and see whether it matters. 477 * It's used by cpu_probe to distinguish between R3000A and R3081. 478 */ 479 static inline int cpu_has_confreg(void) 480 { 481 #ifdef CONFIG_CPU_R3000 482 extern unsigned long r3k_cache_size(unsigned long); 483 unsigned long size1, size2; 484 unsigned long cfg = read_c0_conf(); 485 486 size1 = r3k_cache_size(ST0_ISC); 487 write_c0_conf(cfg ^ R30XX_CONF_AC); 488 size2 = r3k_cache_size(ST0_ISC); 489 write_c0_conf(cfg); 490 return size1 != size2; 491 #else 492 return 0; 493 #endif 494 } 495 496 static inline void set_elf_platform(int cpu, const char *plat) 497 { 498 if (cpu == 0) 499 __elf_platform = plat; 500 } 501 502 static inline void cpu_probe_vmbits(struct cpuinfo_mips *c) 503 { 504 #ifdef __NEED_VMBITS_PROBE 505 write_c0_entryhi(0x3fffffffffffe000ULL); 506 back_to_back_c0_hazard(); 507 c->vmbits = fls64(read_c0_entryhi() & 0x3fffffffffffe000ULL); 508 #endif 509 } 510 511 static void set_isa(struct cpuinfo_mips *c, unsigned int isa) 512 { 513 switch (isa) { 514 case MIPS_CPU_ISA_M64R2: 515 c->isa_level |= MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2; 516 /* fall through */ 517 case MIPS_CPU_ISA_M64R1: 518 c->isa_level |= MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1; 519 /* fall through */ 520 case MIPS_CPU_ISA_V: 521 c->isa_level |= MIPS_CPU_ISA_V; 522 /* fall through */ 523 case MIPS_CPU_ISA_IV: 524 c->isa_level |= MIPS_CPU_ISA_IV; 525 /* fall through */ 526 case MIPS_CPU_ISA_III: 527 c->isa_level |= MIPS_CPU_ISA_II | MIPS_CPU_ISA_III; 528 break; 529 530 /* R6 incompatible with everything else */ 531 case MIPS_CPU_ISA_M64R6: 532 c->isa_level |= MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6; 533 /* fall through */ 534 case MIPS_CPU_ISA_M32R6: 535 c->isa_level |= MIPS_CPU_ISA_M32R6; 536 /* Break here so we don't add incompatible ISAs */ 537 break; 538 case MIPS_CPU_ISA_M32R2: 539 c->isa_level |= MIPS_CPU_ISA_M32R2; 540 /* fall through */ 541 case MIPS_CPU_ISA_M32R1: 542 c->isa_level |= MIPS_CPU_ISA_M32R1; 543 /* fall through */ 544 case MIPS_CPU_ISA_II: 545 c->isa_level |= MIPS_CPU_ISA_II; 546 break; 547 } 548 } 549 550 static char unknown_isa[] = KERN_ERR \ 551 "Unsupported ISA type, c0.config0: %d."; 552 553 static unsigned int calculate_ftlb_probability(struct cpuinfo_mips *c) 554 { 555 556 unsigned int probability = c->tlbsize / c->tlbsizevtlb; 557 558 /* 559 * 0 = All TLBWR instructions go to FTLB 560 * 1 = 15:1: For every 16 TBLWR instructions, 15 go to the 561 * FTLB and 1 goes to the VTLB. 562 * 2 = 7:1: As above with 7:1 ratio. 563 * 3 = 3:1: As above with 3:1 ratio. 564 * 565 * Use the linear midpoint as the probability threshold. 566 */ 567 if (probability >= 12) 568 return 1; 569 else if (probability >= 6) 570 return 2; 571 else 572 /* 573 * So FTLB is less than 4 times bigger than VTLB. 574 * A 3:1 ratio can still be useful though. 575 */ 576 return 3; 577 } 578 579 static int set_ftlb_enable(struct cpuinfo_mips *c, enum ftlb_flags flags) 580 { 581 unsigned int config; 582 583 /* It's implementation dependent how the FTLB can be enabled */ 584 switch (c->cputype) { 585 case CPU_PROAPTIV: 586 case CPU_P5600: 587 case CPU_P6600: 588 /* proAptiv & related cores use Config6 to enable the FTLB */ 589 config = read_c0_config6(); 590 591 if (flags & FTLB_EN) 592 config |= MIPS_CONF6_FTLBEN; 593 else 594 config &= ~MIPS_CONF6_FTLBEN; 595 596 if (flags & FTLB_SET_PROB) { 597 config &= ~(3 << MIPS_CONF6_FTLBP_SHIFT); 598 config |= calculate_ftlb_probability(c) 599 << MIPS_CONF6_FTLBP_SHIFT; 600 } 601 602 write_c0_config6(config); 603 back_to_back_c0_hazard(); 604 break; 605 case CPU_I6400: 606 case CPU_I6500: 607 /* There's no way to disable the FTLB */ 608 if (!(flags & FTLB_EN)) 609 return 1; 610 return 0; 611 case CPU_LOONGSON64: 612 /* Flush ITLB, DTLB, VTLB and FTLB */ 613 write_c0_diag(LOONGSON_DIAG_ITLB | LOONGSON_DIAG_DTLB | 614 LOONGSON_DIAG_VTLB | LOONGSON_DIAG_FTLB); 615 /* Loongson-3 cores use Config6 to enable the FTLB */ 616 config = read_c0_config6(); 617 if (flags & FTLB_EN) 618 /* Enable FTLB */ 619 write_c0_config6(config & ~MIPS_CONF6_FTLBDIS); 620 else 621 /* Disable FTLB */ 622 write_c0_config6(config | MIPS_CONF6_FTLBDIS); 623 break; 624 default: 625 return 1; 626 } 627 628 return 0; 629 } 630 631 static inline unsigned int decode_config0(struct cpuinfo_mips *c) 632 { 633 unsigned int config0; 634 int isa, mt; 635 636 config0 = read_c0_config(); 637 638 /* 639 * Look for Standard TLB or Dual VTLB and FTLB 640 */ 641 mt = config0 & MIPS_CONF_MT; 642 if (mt == MIPS_CONF_MT_TLB) 643 c->options |= MIPS_CPU_TLB; 644 else if (mt == MIPS_CONF_MT_FTLB) 645 c->options |= MIPS_CPU_TLB | MIPS_CPU_FTLB; 646 647 isa = (config0 & MIPS_CONF_AT) >> 13; 648 switch (isa) { 649 case 0: 650 switch ((config0 & MIPS_CONF_AR) >> 10) { 651 case 0: 652 set_isa(c, MIPS_CPU_ISA_M32R1); 653 break; 654 case 1: 655 set_isa(c, MIPS_CPU_ISA_M32R2); 656 break; 657 case 2: 658 set_isa(c, MIPS_CPU_ISA_M32R6); 659 break; 660 default: 661 goto unknown; 662 } 663 break; 664 case 2: 665 switch ((config0 & MIPS_CONF_AR) >> 10) { 666 case 0: 667 set_isa(c, MIPS_CPU_ISA_M64R1); 668 break; 669 case 1: 670 set_isa(c, MIPS_CPU_ISA_M64R2); 671 break; 672 case 2: 673 set_isa(c, MIPS_CPU_ISA_M64R6); 674 break; 675 default: 676 goto unknown; 677 } 678 break; 679 default: 680 goto unknown; 681 } 682 683 return config0 & MIPS_CONF_M; 684 685 unknown: 686 panic(unknown_isa, config0); 687 } 688 689 static inline unsigned int decode_config1(struct cpuinfo_mips *c) 690 { 691 unsigned int config1; 692 693 config1 = read_c0_config1(); 694 695 if (config1 & MIPS_CONF1_MD) 696 c->ases |= MIPS_ASE_MDMX; 697 if (config1 & MIPS_CONF1_PC) 698 c->options |= MIPS_CPU_PERF; 699 if (config1 & MIPS_CONF1_WR) 700 c->options |= MIPS_CPU_WATCH; 701 if (config1 & MIPS_CONF1_CA) 702 c->ases |= MIPS_ASE_MIPS16; 703 if (config1 & MIPS_CONF1_EP) 704 c->options |= MIPS_CPU_EJTAG; 705 if (config1 & MIPS_CONF1_FP) { 706 c->options |= MIPS_CPU_FPU; 707 c->options |= MIPS_CPU_32FPR; 708 } 709 if (cpu_has_tlb) { 710 c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1; 711 c->tlbsizevtlb = c->tlbsize; 712 c->tlbsizeftlbsets = 0; 713 } 714 715 return config1 & MIPS_CONF_M; 716 } 717 718 static inline unsigned int decode_config2(struct cpuinfo_mips *c) 719 { 720 unsigned int config2; 721 722 config2 = read_c0_config2(); 723 724 if (config2 & MIPS_CONF2_SL) 725 c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT; 726 727 return config2 & MIPS_CONF_M; 728 } 729 730 static inline unsigned int decode_config3(struct cpuinfo_mips *c) 731 { 732 unsigned int config3; 733 734 config3 = read_c0_config3(); 735 736 if (config3 & MIPS_CONF3_SM) { 737 c->ases |= MIPS_ASE_SMARTMIPS; 738 c->options |= MIPS_CPU_RIXI | MIPS_CPU_CTXTC; 739 } 740 if (config3 & MIPS_CONF3_RXI) 741 c->options |= MIPS_CPU_RIXI; 742 if (config3 & MIPS_CONF3_CTXTC) 743 c->options |= MIPS_CPU_CTXTC; 744 if (config3 & MIPS_CONF3_DSP) 745 c->ases |= MIPS_ASE_DSP; 746 if (config3 & MIPS_CONF3_DSP2P) { 747 c->ases |= MIPS_ASE_DSP2P; 748 if (cpu_has_mips_r6) 749 c->ases |= MIPS_ASE_DSP3; 750 } 751 if (config3 & MIPS_CONF3_VINT) 752 c->options |= MIPS_CPU_VINT; 753 if (config3 & MIPS_CONF3_VEIC) 754 c->options |= MIPS_CPU_VEIC; 755 if (config3 & MIPS_CONF3_LPA) 756 c->options |= MIPS_CPU_LPA; 757 if (config3 & MIPS_CONF3_MT) 758 c->ases |= MIPS_ASE_MIPSMT; 759 if (config3 & MIPS_CONF3_ULRI) 760 c->options |= MIPS_CPU_ULRI; 761 if (config3 & MIPS_CONF3_ISA) 762 c->options |= MIPS_CPU_MICROMIPS; 763 if (config3 & MIPS_CONF3_VZ) 764 c->ases |= MIPS_ASE_VZ; 765 if (config3 & MIPS_CONF3_SC) 766 c->options |= MIPS_CPU_SEGMENTS; 767 if (config3 & MIPS_CONF3_BI) 768 c->options |= MIPS_CPU_BADINSTR; 769 if (config3 & MIPS_CONF3_BP) 770 c->options |= MIPS_CPU_BADINSTRP; 771 if (config3 & MIPS_CONF3_MSA) 772 c->ases |= MIPS_ASE_MSA; 773 if (config3 & MIPS_CONF3_PW) { 774 c->htw_seq = 0; 775 c->options |= MIPS_CPU_HTW; 776 } 777 if (config3 & MIPS_CONF3_CDMM) 778 c->options |= MIPS_CPU_CDMM; 779 if (config3 & MIPS_CONF3_SP) 780 c->options |= MIPS_CPU_SP; 781 782 return config3 & MIPS_CONF_M; 783 } 784 785 static inline unsigned int decode_config4(struct cpuinfo_mips *c) 786 { 787 unsigned int config4; 788 unsigned int newcf4; 789 unsigned int mmuextdef; 790 unsigned int ftlb_page = MIPS_CONF4_FTLBPAGESIZE; 791 unsigned long asid_mask; 792 793 config4 = read_c0_config4(); 794 795 if (cpu_has_tlb) { 796 if (((config4 & MIPS_CONF4_IE) >> 29) == 2) 797 c->options |= MIPS_CPU_TLBINV; 798 799 /* 800 * R6 has dropped the MMUExtDef field from config4. 801 * On R6 the fields always describe the FTLB, and only if it is 802 * present according to Config.MT. 803 */ 804 if (!cpu_has_mips_r6) 805 mmuextdef = config4 & MIPS_CONF4_MMUEXTDEF; 806 else if (cpu_has_ftlb) 807 mmuextdef = MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT; 808 else 809 mmuextdef = 0; 810 811 switch (mmuextdef) { 812 case MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT: 813 c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40; 814 c->tlbsizevtlb = c->tlbsize; 815 break; 816 case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT: 817 c->tlbsizevtlb += 818 ((config4 & MIPS_CONF4_VTLBSIZEEXT) >> 819 MIPS_CONF4_VTLBSIZEEXT_SHIFT) * 0x40; 820 c->tlbsize = c->tlbsizevtlb; 821 ftlb_page = MIPS_CONF4_VFTLBPAGESIZE; 822 /* fall through */ 823 case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT: 824 if (mips_ftlb_disabled) 825 break; 826 newcf4 = (config4 & ~ftlb_page) | 827 (page_size_ftlb(mmuextdef) << 828 MIPS_CONF4_FTLBPAGESIZE_SHIFT); 829 write_c0_config4(newcf4); 830 back_to_back_c0_hazard(); 831 config4 = read_c0_config4(); 832 if (config4 != newcf4) { 833 pr_err("PAGE_SIZE 0x%lx is not supported by FTLB (config4=0x%x)\n", 834 PAGE_SIZE, config4); 835 /* Switch FTLB off */ 836 set_ftlb_enable(c, 0); 837 mips_ftlb_disabled = 1; 838 break; 839 } 840 c->tlbsizeftlbsets = 1 << 841 ((config4 & MIPS_CONF4_FTLBSETS) >> 842 MIPS_CONF4_FTLBSETS_SHIFT); 843 c->tlbsizeftlbways = ((config4 & MIPS_CONF4_FTLBWAYS) >> 844 MIPS_CONF4_FTLBWAYS_SHIFT) + 2; 845 c->tlbsize += c->tlbsizeftlbways * c->tlbsizeftlbsets; 846 mips_has_ftlb_configured = 1; 847 break; 848 } 849 } 850 851 c->kscratch_mask = (config4 & MIPS_CONF4_KSCREXIST) 852 >> MIPS_CONF4_KSCREXIST_SHIFT; 853 854 asid_mask = MIPS_ENTRYHI_ASID; 855 if (config4 & MIPS_CONF4_AE) 856 asid_mask |= MIPS_ENTRYHI_ASIDX; 857 set_cpu_asid_mask(c, asid_mask); 858 859 /* 860 * Warn if the computed ASID mask doesn't match the mask the kernel 861 * is built for. This may indicate either a serious problem or an 862 * easy optimisation opportunity, but either way should be addressed. 863 */ 864 WARN_ON(asid_mask != cpu_asid_mask(c)); 865 866 return config4 & MIPS_CONF_M; 867 } 868 869 static inline unsigned int decode_config5(struct cpuinfo_mips *c) 870 { 871 unsigned int config5, max_mmid_width; 872 unsigned long asid_mask; 873 874 config5 = read_c0_config5(); 875 config5 &= ~(MIPS_CONF5_UFR | MIPS_CONF5_UFE); 876 877 if (cpu_has_mips_r6) { 878 if (!__builtin_constant_p(cpu_has_mmid) || cpu_has_mmid) 879 config5 |= MIPS_CONF5_MI; 880 else 881 config5 &= ~MIPS_CONF5_MI; 882 } 883 884 write_c0_config5(config5); 885 886 if (config5 & MIPS_CONF5_EVA) 887 c->options |= MIPS_CPU_EVA; 888 if (config5 & MIPS_CONF5_MRP) 889 c->options |= MIPS_CPU_MAAR; 890 if (config5 & MIPS_CONF5_LLB) 891 c->options |= MIPS_CPU_RW_LLB; 892 if (config5 & MIPS_CONF5_MVH) 893 c->options |= MIPS_CPU_MVH; 894 if (cpu_has_mips_r6 && (config5 & MIPS_CONF5_VP)) 895 c->options |= MIPS_CPU_VP; 896 if (config5 & MIPS_CONF5_CA2) 897 c->ases |= MIPS_ASE_MIPS16E2; 898 899 if (config5 & MIPS_CONF5_CRCP) 900 elf_hwcap |= HWCAP_MIPS_CRC32; 901 902 if (cpu_has_mips_r6) { 903 /* Ensure the write to config5 above takes effect */ 904 back_to_back_c0_hazard(); 905 906 /* Check whether we successfully enabled MMID support */ 907 config5 = read_c0_config5(); 908 if (config5 & MIPS_CONF5_MI) 909 c->options |= MIPS_CPU_MMID; 910 911 /* 912 * Warn if we've hardcoded cpu_has_mmid to a value unsuitable 913 * for the CPU we're running on, or if CPUs in an SMP system 914 * have inconsistent MMID support. 915 */ 916 WARN_ON(!!cpu_has_mmid != !!(config5 & MIPS_CONF5_MI)); 917 918 if (cpu_has_mmid) { 919 write_c0_memorymapid(~0ul); 920 back_to_back_c0_hazard(); 921 asid_mask = read_c0_memorymapid(); 922 923 /* 924 * We maintain a bitmap to track MMID allocation, and 925 * need a sensible upper bound on the size of that 926 * bitmap. The initial CPU with MMID support (I6500) 927 * supports 16 bit MMIDs, which gives us an 8KiB 928 * bitmap. The architecture recommends that hardware 929 * support 32 bit MMIDs, which would give us a 512MiB 930 * bitmap - that's too big in most cases. 931 * 932 * Cap MMID width at 16 bits for now & we can revisit 933 * this if & when hardware supports anything wider. 934 */ 935 max_mmid_width = 16; 936 if (asid_mask > GENMASK(max_mmid_width - 1, 0)) { 937 pr_info("Capping MMID width at %d bits", 938 max_mmid_width); 939 asid_mask = GENMASK(max_mmid_width - 1, 0); 940 } 941 942 set_cpu_asid_mask(c, asid_mask); 943 } 944 } 945 946 return config5 & MIPS_CONF_M; 947 } 948 949 static void decode_configs(struct cpuinfo_mips *c) 950 { 951 int ok; 952 953 /* MIPS32 or MIPS64 compliant CPU. */ 954 c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER | 955 MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK; 956 957 c->scache.flags = MIPS_CACHE_NOT_PRESENT; 958 959 /* Enable FTLB if present and not disabled */ 960 set_ftlb_enable(c, mips_ftlb_disabled ? 0 : FTLB_EN); 961 962 ok = decode_config0(c); /* Read Config registers. */ 963 BUG_ON(!ok); /* Arch spec violation! */ 964 if (ok) 965 ok = decode_config1(c); 966 if (ok) 967 ok = decode_config2(c); 968 if (ok) 969 ok = decode_config3(c); 970 if (ok) 971 ok = decode_config4(c); 972 if (ok) 973 ok = decode_config5(c); 974 975 /* Probe the EBase.WG bit */ 976 if (cpu_has_mips_r2_r6) { 977 u64 ebase; 978 unsigned int status; 979 980 /* {read,write}_c0_ebase_64() may be UNDEFINED prior to r6 */ 981 ebase = cpu_has_mips64r6 ? read_c0_ebase_64() 982 : (s32)read_c0_ebase(); 983 if (ebase & MIPS_EBASE_WG) { 984 /* WG bit already set, we can avoid the clumsy probe */ 985 c->options |= MIPS_CPU_EBASE_WG; 986 } else { 987 /* Its UNDEFINED to change EBase while BEV=0 */ 988 status = read_c0_status(); 989 write_c0_status(status | ST0_BEV); 990 irq_enable_hazard(); 991 /* 992 * On pre-r6 cores, this may well clobber the upper bits 993 * of EBase. This is hard to avoid without potentially 994 * hitting UNDEFINED dm*c0 behaviour if EBase is 32-bit. 995 */ 996 if (cpu_has_mips64r6) 997 write_c0_ebase_64(ebase | MIPS_EBASE_WG); 998 else 999 write_c0_ebase(ebase | MIPS_EBASE_WG); 1000 back_to_back_c0_hazard(); 1001 /* Restore BEV */ 1002 write_c0_status(status); 1003 if (read_c0_ebase() & MIPS_EBASE_WG) { 1004 c->options |= MIPS_CPU_EBASE_WG; 1005 write_c0_ebase(ebase); 1006 } 1007 } 1008 } 1009 1010 /* configure the FTLB write probability */ 1011 set_ftlb_enable(c, (mips_ftlb_disabled ? 0 : FTLB_EN) | FTLB_SET_PROB); 1012 1013 mips_probe_watch_registers(c); 1014 1015 #ifndef CONFIG_MIPS_CPS 1016 if (cpu_has_mips_r2_r6) { 1017 unsigned int core; 1018 1019 core = get_ebase_cpunum(); 1020 if (cpu_has_mipsmt) 1021 core >>= fls(core_nvpes()) - 1; 1022 cpu_set_core(c, core); 1023 } 1024 #endif 1025 } 1026 1027 /* 1028 * Probe for certain guest capabilities by writing config bits and reading back. 1029 * Finally write back the original value. 1030 */ 1031 #define probe_gc0_config(name, maxconf, bits) \ 1032 do { \ 1033 unsigned int tmp; \ 1034 tmp = read_gc0_##name(); \ 1035 write_gc0_##name(tmp | (bits)); \ 1036 back_to_back_c0_hazard(); \ 1037 maxconf = read_gc0_##name(); \ 1038 write_gc0_##name(tmp); \ 1039 } while (0) 1040 1041 /* 1042 * Probe for dynamic guest capabilities by changing certain config bits and 1043 * reading back to see if they change. Finally write back the original value. 1044 */ 1045 #define probe_gc0_config_dyn(name, maxconf, dynconf, bits) \ 1046 do { \ 1047 maxconf = read_gc0_##name(); \ 1048 write_gc0_##name(maxconf ^ (bits)); \ 1049 back_to_back_c0_hazard(); \ 1050 dynconf = maxconf ^ read_gc0_##name(); \ 1051 write_gc0_##name(maxconf); \ 1052 maxconf |= dynconf; \ 1053 } while (0) 1054 1055 static inline unsigned int decode_guest_config0(struct cpuinfo_mips *c) 1056 { 1057 unsigned int config0; 1058 1059 probe_gc0_config(config, config0, MIPS_CONF_M); 1060 1061 if (config0 & MIPS_CONF_M) 1062 c->guest.conf |= BIT(1); 1063 return config0 & MIPS_CONF_M; 1064 } 1065 1066 static inline unsigned int decode_guest_config1(struct cpuinfo_mips *c) 1067 { 1068 unsigned int config1, config1_dyn; 1069 1070 probe_gc0_config_dyn(config1, config1, config1_dyn, 1071 MIPS_CONF_M | MIPS_CONF1_PC | MIPS_CONF1_WR | 1072 MIPS_CONF1_FP); 1073 1074 if (config1 & MIPS_CONF1_FP) 1075 c->guest.options |= MIPS_CPU_FPU; 1076 if (config1_dyn & MIPS_CONF1_FP) 1077 c->guest.options_dyn |= MIPS_CPU_FPU; 1078 1079 if (config1 & MIPS_CONF1_WR) 1080 c->guest.options |= MIPS_CPU_WATCH; 1081 if (config1_dyn & MIPS_CONF1_WR) 1082 c->guest.options_dyn |= MIPS_CPU_WATCH; 1083 1084 if (config1 & MIPS_CONF1_PC) 1085 c->guest.options |= MIPS_CPU_PERF; 1086 if (config1_dyn & MIPS_CONF1_PC) 1087 c->guest.options_dyn |= MIPS_CPU_PERF; 1088 1089 if (config1 & MIPS_CONF_M) 1090 c->guest.conf |= BIT(2); 1091 return config1 & MIPS_CONF_M; 1092 } 1093 1094 static inline unsigned int decode_guest_config2(struct cpuinfo_mips *c) 1095 { 1096 unsigned int config2; 1097 1098 probe_gc0_config(config2, config2, MIPS_CONF_M); 1099 1100 if (config2 & MIPS_CONF_M) 1101 c->guest.conf |= BIT(3); 1102 return config2 & MIPS_CONF_M; 1103 } 1104 1105 static inline unsigned int decode_guest_config3(struct cpuinfo_mips *c) 1106 { 1107 unsigned int config3, config3_dyn; 1108 1109 probe_gc0_config_dyn(config3, config3, config3_dyn, 1110 MIPS_CONF_M | MIPS_CONF3_MSA | MIPS_CONF3_ULRI | 1111 MIPS_CONF3_CTXTC); 1112 1113 if (config3 & MIPS_CONF3_CTXTC) 1114 c->guest.options |= MIPS_CPU_CTXTC; 1115 if (config3_dyn & MIPS_CONF3_CTXTC) 1116 c->guest.options_dyn |= MIPS_CPU_CTXTC; 1117 1118 if (config3 & MIPS_CONF3_PW) 1119 c->guest.options |= MIPS_CPU_HTW; 1120 1121 if (config3 & MIPS_CONF3_ULRI) 1122 c->guest.options |= MIPS_CPU_ULRI; 1123 1124 if (config3 & MIPS_CONF3_SC) 1125 c->guest.options |= MIPS_CPU_SEGMENTS; 1126 1127 if (config3 & MIPS_CONF3_BI) 1128 c->guest.options |= MIPS_CPU_BADINSTR; 1129 if (config3 & MIPS_CONF3_BP) 1130 c->guest.options |= MIPS_CPU_BADINSTRP; 1131 1132 if (config3 & MIPS_CONF3_MSA) 1133 c->guest.ases |= MIPS_ASE_MSA; 1134 if (config3_dyn & MIPS_CONF3_MSA) 1135 c->guest.ases_dyn |= MIPS_ASE_MSA; 1136 1137 if (config3 & MIPS_CONF_M) 1138 c->guest.conf |= BIT(4); 1139 return config3 & MIPS_CONF_M; 1140 } 1141 1142 static inline unsigned int decode_guest_config4(struct cpuinfo_mips *c) 1143 { 1144 unsigned int config4; 1145 1146 probe_gc0_config(config4, config4, 1147 MIPS_CONF_M | MIPS_CONF4_KSCREXIST); 1148 1149 c->guest.kscratch_mask = (config4 & MIPS_CONF4_KSCREXIST) 1150 >> MIPS_CONF4_KSCREXIST_SHIFT; 1151 1152 if (config4 & MIPS_CONF_M) 1153 c->guest.conf |= BIT(5); 1154 return config4 & MIPS_CONF_M; 1155 } 1156 1157 static inline unsigned int decode_guest_config5(struct cpuinfo_mips *c) 1158 { 1159 unsigned int config5, config5_dyn; 1160 1161 probe_gc0_config_dyn(config5, config5, config5_dyn, 1162 MIPS_CONF_M | MIPS_CONF5_MVH | MIPS_CONF5_MRP); 1163 1164 if (config5 & MIPS_CONF5_MRP) 1165 c->guest.options |= MIPS_CPU_MAAR; 1166 if (config5_dyn & MIPS_CONF5_MRP) 1167 c->guest.options_dyn |= MIPS_CPU_MAAR; 1168 1169 if (config5 & MIPS_CONF5_LLB) 1170 c->guest.options |= MIPS_CPU_RW_LLB; 1171 1172 if (config5 & MIPS_CONF5_MVH) 1173 c->guest.options |= MIPS_CPU_MVH; 1174 1175 if (config5 & MIPS_CONF_M) 1176 c->guest.conf |= BIT(6); 1177 return config5 & MIPS_CONF_M; 1178 } 1179 1180 static inline void decode_guest_configs(struct cpuinfo_mips *c) 1181 { 1182 unsigned int ok; 1183 1184 ok = decode_guest_config0(c); 1185 if (ok) 1186 ok = decode_guest_config1(c); 1187 if (ok) 1188 ok = decode_guest_config2(c); 1189 if (ok) 1190 ok = decode_guest_config3(c); 1191 if (ok) 1192 ok = decode_guest_config4(c); 1193 if (ok) 1194 decode_guest_config5(c); 1195 } 1196 1197 static inline void cpu_probe_guestctl0(struct cpuinfo_mips *c) 1198 { 1199 unsigned int guestctl0, temp; 1200 1201 guestctl0 = read_c0_guestctl0(); 1202 1203 if (guestctl0 & MIPS_GCTL0_G0E) 1204 c->options |= MIPS_CPU_GUESTCTL0EXT; 1205 if (guestctl0 & MIPS_GCTL0_G1) 1206 c->options |= MIPS_CPU_GUESTCTL1; 1207 if (guestctl0 & MIPS_GCTL0_G2) 1208 c->options |= MIPS_CPU_GUESTCTL2; 1209 if (!(guestctl0 & MIPS_GCTL0_RAD)) { 1210 c->options |= MIPS_CPU_GUESTID; 1211 1212 /* 1213 * Probe for Direct Root to Guest (DRG). Set GuestCtl1.RID = 0 1214 * first, otherwise all data accesses will be fully virtualised 1215 * as if they were performed by guest mode. 1216 */ 1217 write_c0_guestctl1(0); 1218 tlbw_use_hazard(); 1219 1220 write_c0_guestctl0(guestctl0 | MIPS_GCTL0_DRG); 1221 back_to_back_c0_hazard(); 1222 temp = read_c0_guestctl0(); 1223 1224 if (temp & MIPS_GCTL0_DRG) { 1225 write_c0_guestctl0(guestctl0); 1226 c->options |= MIPS_CPU_DRG; 1227 } 1228 } 1229 } 1230 1231 static inline void cpu_probe_guestctl1(struct cpuinfo_mips *c) 1232 { 1233 if (cpu_has_guestid) { 1234 /* determine the number of bits of GuestID available */ 1235 write_c0_guestctl1(MIPS_GCTL1_ID); 1236 back_to_back_c0_hazard(); 1237 c->guestid_mask = (read_c0_guestctl1() & MIPS_GCTL1_ID) 1238 >> MIPS_GCTL1_ID_SHIFT; 1239 write_c0_guestctl1(0); 1240 } 1241 } 1242 1243 static inline void cpu_probe_gtoffset(struct cpuinfo_mips *c) 1244 { 1245 /* determine the number of bits of GTOffset available */ 1246 write_c0_gtoffset(0xffffffff); 1247 back_to_back_c0_hazard(); 1248 c->gtoffset_mask = read_c0_gtoffset(); 1249 write_c0_gtoffset(0); 1250 } 1251 1252 static inline void cpu_probe_vz(struct cpuinfo_mips *c) 1253 { 1254 cpu_probe_guestctl0(c); 1255 if (cpu_has_guestctl1) 1256 cpu_probe_guestctl1(c); 1257 1258 cpu_probe_gtoffset(c); 1259 1260 decode_guest_configs(c); 1261 } 1262 1263 #define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \ 1264 | MIPS_CPU_COUNTER) 1265 1266 static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu) 1267 { 1268 switch (c->processor_id & PRID_IMP_MASK) { 1269 case PRID_IMP_R2000: 1270 c->cputype = CPU_R2000; 1271 __cpu_name[cpu] = "R2000"; 1272 c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS; 1273 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE | 1274 MIPS_CPU_NOFPUEX; 1275 if (__cpu_has_fpu()) 1276 c->options |= MIPS_CPU_FPU; 1277 c->tlbsize = 64; 1278 break; 1279 case PRID_IMP_R3000: 1280 if ((c->processor_id & PRID_REV_MASK) == PRID_REV_R3000A) { 1281 if (cpu_has_confreg()) { 1282 c->cputype = CPU_R3081E; 1283 __cpu_name[cpu] = "R3081"; 1284 } else { 1285 c->cputype = CPU_R3000A; 1286 __cpu_name[cpu] = "R3000A"; 1287 } 1288 } else { 1289 c->cputype = CPU_R3000; 1290 __cpu_name[cpu] = "R3000"; 1291 } 1292 c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS; 1293 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE | 1294 MIPS_CPU_NOFPUEX; 1295 if (__cpu_has_fpu()) 1296 c->options |= MIPS_CPU_FPU; 1297 c->tlbsize = 64; 1298 break; 1299 case PRID_IMP_R4000: 1300 if (read_c0_config() & CONF_SC) { 1301 if ((c->processor_id & PRID_REV_MASK) >= 1302 PRID_REV_R4400) { 1303 c->cputype = CPU_R4400PC; 1304 __cpu_name[cpu] = "R4400PC"; 1305 } else { 1306 c->cputype = CPU_R4000PC; 1307 __cpu_name[cpu] = "R4000PC"; 1308 } 1309 } else { 1310 int cca = read_c0_config() & CONF_CM_CMASK; 1311 int mc; 1312 1313 /* 1314 * SC and MC versions can't be reliably told apart, 1315 * but only the latter support coherent caching 1316 * modes so assume the firmware has set the KSEG0 1317 * coherency attribute reasonably (if uncached, we 1318 * assume SC). 1319 */ 1320 switch (cca) { 1321 case CONF_CM_CACHABLE_CE: 1322 case CONF_CM_CACHABLE_COW: 1323 case CONF_CM_CACHABLE_CUW: 1324 mc = 1; 1325 break; 1326 default: 1327 mc = 0; 1328 break; 1329 } 1330 if ((c->processor_id & PRID_REV_MASK) >= 1331 PRID_REV_R4400) { 1332 c->cputype = mc ? CPU_R4400MC : CPU_R4400SC; 1333 __cpu_name[cpu] = mc ? "R4400MC" : "R4400SC"; 1334 } else { 1335 c->cputype = mc ? CPU_R4000MC : CPU_R4000SC; 1336 __cpu_name[cpu] = mc ? "R4000MC" : "R4000SC"; 1337 } 1338 } 1339 1340 set_isa(c, MIPS_CPU_ISA_III); 1341 c->fpu_msk31 |= FPU_CSR_CONDX; 1342 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 1343 MIPS_CPU_WATCH | MIPS_CPU_VCE | 1344 MIPS_CPU_LLSC; 1345 c->tlbsize = 48; 1346 break; 1347 case PRID_IMP_VR41XX: 1348 set_isa(c, MIPS_CPU_ISA_III); 1349 c->fpu_msk31 |= FPU_CSR_CONDX; 1350 c->options = R4K_OPTS; 1351 c->tlbsize = 32; 1352 switch (c->processor_id & 0xf0) { 1353 case PRID_REV_VR4111: 1354 c->cputype = CPU_VR4111; 1355 __cpu_name[cpu] = "NEC VR4111"; 1356 break; 1357 case PRID_REV_VR4121: 1358 c->cputype = CPU_VR4121; 1359 __cpu_name[cpu] = "NEC VR4121"; 1360 break; 1361 case PRID_REV_VR4122: 1362 if ((c->processor_id & 0xf) < 0x3) { 1363 c->cputype = CPU_VR4122; 1364 __cpu_name[cpu] = "NEC VR4122"; 1365 } else { 1366 c->cputype = CPU_VR4181A; 1367 __cpu_name[cpu] = "NEC VR4181A"; 1368 } 1369 break; 1370 case PRID_REV_VR4130: 1371 if ((c->processor_id & 0xf) < 0x4) { 1372 c->cputype = CPU_VR4131; 1373 __cpu_name[cpu] = "NEC VR4131"; 1374 } else { 1375 c->cputype = CPU_VR4133; 1376 c->options |= MIPS_CPU_LLSC; 1377 __cpu_name[cpu] = "NEC VR4133"; 1378 } 1379 break; 1380 default: 1381 printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n"); 1382 c->cputype = CPU_VR41XX; 1383 __cpu_name[cpu] = "NEC Vr41xx"; 1384 break; 1385 } 1386 break; 1387 case PRID_IMP_R4600: 1388 c->cputype = CPU_R4600; 1389 __cpu_name[cpu] = "R4600"; 1390 set_isa(c, MIPS_CPU_ISA_III); 1391 c->fpu_msk31 |= FPU_CSR_CONDX; 1392 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 1393 MIPS_CPU_LLSC; 1394 c->tlbsize = 48; 1395 break; 1396 #if 0 1397 case PRID_IMP_R4650: 1398 /* 1399 * This processor doesn't have an MMU, so it's not 1400 * "real easy" to run Linux on it. It is left purely 1401 * for documentation. Commented out because it shares 1402 * it's c0_prid id number with the TX3900. 1403 */ 1404 c->cputype = CPU_R4650; 1405 __cpu_name[cpu] = "R4650"; 1406 set_isa(c, MIPS_CPU_ISA_III); 1407 c->fpu_msk31 |= FPU_CSR_CONDX; 1408 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC; 1409 c->tlbsize = 48; 1410 break; 1411 #endif 1412 case PRID_IMP_TX39: 1413 c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS; 1414 c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE; 1415 1416 if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) { 1417 c->cputype = CPU_TX3927; 1418 __cpu_name[cpu] = "TX3927"; 1419 c->tlbsize = 64; 1420 } else { 1421 switch (c->processor_id & PRID_REV_MASK) { 1422 case PRID_REV_TX3912: 1423 c->cputype = CPU_TX3912; 1424 __cpu_name[cpu] = "TX3912"; 1425 c->tlbsize = 32; 1426 break; 1427 case PRID_REV_TX3922: 1428 c->cputype = CPU_TX3922; 1429 __cpu_name[cpu] = "TX3922"; 1430 c->tlbsize = 64; 1431 break; 1432 } 1433 } 1434 break; 1435 case PRID_IMP_R4700: 1436 c->cputype = CPU_R4700; 1437 __cpu_name[cpu] = "R4700"; 1438 set_isa(c, MIPS_CPU_ISA_III); 1439 c->fpu_msk31 |= FPU_CSR_CONDX; 1440 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 1441 MIPS_CPU_LLSC; 1442 c->tlbsize = 48; 1443 break; 1444 case PRID_IMP_TX49: 1445 c->cputype = CPU_TX49XX; 1446 __cpu_name[cpu] = "R49XX"; 1447 set_isa(c, MIPS_CPU_ISA_III); 1448 c->fpu_msk31 |= FPU_CSR_CONDX; 1449 c->options = R4K_OPTS | MIPS_CPU_LLSC; 1450 if (!(c->processor_id & 0x08)) 1451 c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR; 1452 c->tlbsize = 48; 1453 break; 1454 case PRID_IMP_R5000: 1455 c->cputype = CPU_R5000; 1456 __cpu_name[cpu] = "R5000"; 1457 set_isa(c, MIPS_CPU_ISA_IV); 1458 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 1459 MIPS_CPU_LLSC; 1460 c->tlbsize = 48; 1461 break; 1462 case PRID_IMP_R5500: 1463 c->cputype = CPU_R5500; 1464 __cpu_name[cpu] = "R5500"; 1465 set_isa(c, MIPS_CPU_ISA_IV); 1466 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 1467 MIPS_CPU_WATCH | MIPS_CPU_LLSC; 1468 c->tlbsize = 48; 1469 break; 1470 case PRID_IMP_NEVADA: 1471 c->cputype = CPU_NEVADA; 1472 __cpu_name[cpu] = "Nevada"; 1473 set_isa(c, MIPS_CPU_ISA_IV); 1474 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 1475 MIPS_CPU_DIVEC | MIPS_CPU_LLSC; 1476 c->tlbsize = 48; 1477 break; 1478 case PRID_IMP_RM7000: 1479 c->cputype = CPU_RM7000; 1480 __cpu_name[cpu] = "RM7000"; 1481 set_isa(c, MIPS_CPU_ISA_IV); 1482 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR | 1483 MIPS_CPU_LLSC; 1484 /* 1485 * Undocumented RM7000: Bit 29 in the info register of 1486 * the RM7000 v2.0 indicates if the TLB has 48 or 64 1487 * entries. 1488 * 1489 * 29 1 => 64 entry JTLB 1490 * 0 => 48 entry JTLB 1491 */ 1492 c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48; 1493 break; 1494 case PRID_IMP_R10000: 1495 c->cputype = CPU_R10000; 1496 __cpu_name[cpu] = "R10000"; 1497 set_isa(c, MIPS_CPU_ISA_IV); 1498 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX | 1499 MIPS_CPU_FPU | MIPS_CPU_32FPR | 1500 MIPS_CPU_COUNTER | MIPS_CPU_WATCH | 1501 MIPS_CPU_LLSC; 1502 c->tlbsize = 64; 1503 break; 1504 case PRID_IMP_R12000: 1505 c->cputype = CPU_R12000; 1506 __cpu_name[cpu] = "R12000"; 1507 set_isa(c, MIPS_CPU_ISA_IV); 1508 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX | 1509 MIPS_CPU_FPU | MIPS_CPU_32FPR | 1510 MIPS_CPU_COUNTER | MIPS_CPU_WATCH | 1511 MIPS_CPU_LLSC | MIPS_CPU_BP_GHIST; 1512 c->tlbsize = 64; 1513 break; 1514 case PRID_IMP_R14000: 1515 if (((c->processor_id >> 4) & 0x0f) > 2) { 1516 c->cputype = CPU_R16000; 1517 __cpu_name[cpu] = "R16000"; 1518 } else { 1519 c->cputype = CPU_R14000; 1520 __cpu_name[cpu] = "R14000"; 1521 } 1522 set_isa(c, MIPS_CPU_ISA_IV); 1523 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX | 1524 MIPS_CPU_FPU | MIPS_CPU_32FPR | 1525 MIPS_CPU_COUNTER | MIPS_CPU_WATCH | 1526 MIPS_CPU_LLSC | MIPS_CPU_BP_GHIST; 1527 c->tlbsize = 64; 1528 break; 1529 case PRID_IMP_LOONGSON_64C: /* Loongson-2/3 */ 1530 switch (c->processor_id & PRID_REV_MASK) { 1531 case PRID_REV_LOONGSON2E: 1532 c->cputype = CPU_LOONGSON2EF; 1533 __cpu_name[cpu] = "ICT Loongson-2"; 1534 set_elf_platform(cpu, "loongson2e"); 1535 set_isa(c, MIPS_CPU_ISA_III); 1536 c->fpu_msk31 |= FPU_CSR_CONDX; 1537 break; 1538 case PRID_REV_LOONGSON2F: 1539 c->cputype = CPU_LOONGSON2EF; 1540 __cpu_name[cpu] = "ICT Loongson-2"; 1541 set_elf_platform(cpu, "loongson2f"); 1542 set_isa(c, MIPS_CPU_ISA_III); 1543 c->fpu_msk31 |= FPU_CSR_CONDX; 1544 break; 1545 case PRID_REV_LOONGSON3A_R1: 1546 c->cputype = CPU_LOONGSON64; 1547 __cpu_name[cpu] = "ICT Loongson-3"; 1548 set_elf_platform(cpu, "loongson3a"); 1549 set_isa(c, MIPS_CPU_ISA_M64R1); 1550 c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM | 1551 MIPS_ASE_LOONGSON_EXT); 1552 break; 1553 case PRID_REV_LOONGSON3B_R1: 1554 case PRID_REV_LOONGSON3B_R2: 1555 c->cputype = CPU_LOONGSON64; 1556 __cpu_name[cpu] = "ICT Loongson-3"; 1557 set_elf_platform(cpu, "loongson3b"); 1558 set_isa(c, MIPS_CPU_ISA_M64R1); 1559 c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM | 1560 MIPS_ASE_LOONGSON_EXT); 1561 break; 1562 } 1563 1564 c->options = R4K_OPTS | 1565 MIPS_CPU_FPU | MIPS_CPU_LLSC | 1566 MIPS_CPU_32FPR; 1567 c->tlbsize = 64; 1568 set_cpu_asid_mask(c, MIPS_ENTRYHI_ASID); 1569 c->writecombine = _CACHE_UNCACHED_ACCELERATED; 1570 break; 1571 case PRID_IMP_LOONGSON_32: /* Loongson-1 */ 1572 decode_configs(c); 1573 1574 c->cputype = CPU_LOONGSON32; 1575 1576 switch (c->processor_id & PRID_REV_MASK) { 1577 case PRID_REV_LOONGSON1B: 1578 __cpu_name[cpu] = "Loongson 1B"; 1579 break; 1580 } 1581 1582 break; 1583 } 1584 } 1585 1586 static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu) 1587 { 1588 c->writecombine = _CACHE_UNCACHED_ACCELERATED; 1589 switch (c->processor_id & PRID_IMP_MASK) { 1590 case PRID_IMP_QEMU_GENERIC: 1591 c->writecombine = _CACHE_UNCACHED; 1592 c->cputype = CPU_QEMU_GENERIC; 1593 __cpu_name[cpu] = "MIPS GENERIC QEMU"; 1594 break; 1595 case PRID_IMP_4KC: 1596 c->cputype = CPU_4KC; 1597 c->writecombine = _CACHE_UNCACHED; 1598 __cpu_name[cpu] = "MIPS 4Kc"; 1599 break; 1600 case PRID_IMP_4KEC: 1601 case PRID_IMP_4KECR2: 1602 c->cputype = CPU_4KEC; 1603 c->writecombine = _CACHE_UNCACHED; 1604 __cpu_name[cpu] = "MIPS 4KEc"; 1605 break; 1606 case PRID_IMP_4KSC: 1607 case PRID_IMP_4KSD: 1608 c->cputype = CPU_4KSC; 1609 c->writecombine = _CACHE_UNCACHED; 1610 __cpu_name[cpu] = "MIPS 4KSc"; 1611 break; 1612 case PRID_IMP_5KC: 1613 c->cputype = CPU_5KC; 1614 c->writecombine = _CACHE_UNCACHED; 1615 __cpu_name[cpu] = "MIPS 5Kc"; 1616 break; 1617 case PRID_IMP_5KE: 1618 c->cputype = CPU_5KE; 1619 c->writecombine = _CACHE_UNCACHED; 1620 __cpu_name[cpu] = "MIPS 5KE"; 1621 break; 1622 case PRID_IMP_20KC: 1623 c->cputype = CPU_20KC; 1624 c->writecombine = _CACHE_UNCACHED; 1625 __cpu_name[cpu] = "MIPS 20Kc"; 1626 break; 1627 case PRID_IMP_24K: 1628 c->cputype = CPU_24K; 1629 c->writecombine = _CACHE_UNCACHED; 1630 __cpu_name[cpu] = "MIPS 24Kc"; 1631 break; 1632 case PRID_IMP_24KE: 1633 c->cputype = CPU_24K; 1634 c->writecombine = _CACHE_UNCACHED; 1635 __cpu_name[cpu] = "MIPS 24KEc"; 1636 break; 1637 case PRID_IMP_25KF: 1638 c->cputype = CPU_25KF; 1639 c->writecombine = _CACHE_UNCACHED; 1640 __cpu_name[cpu] = "MIPS 25Kc"; 1641 break; 1642 case PRID_IMP_34K: 1643 c->cputype = CPU_34K; 1644 c->writecombine = _CACHE_UNCACHED; 1645 __cpu_name[cpu] = "MIPS 34Kc"; 1646 cpu_set_mt_per_tc_perf(c); 1647 break; 1648 case PRID_IMP_74K: 1649 c->cputype = CPU_74K; 1650 c->writecombine = _CACHE_UNCACHED; 1651 __cpu_name[cpu] = "MIPS 74Kc"; 1652 break; 1653 case PRID_IMP_M14KC: 1654 c->cputype = CPU_M14KC; 1655 c->writecombine = _CACHE_UNCACHED; 1656 __cpu_name[cpu] = "MIPS M14Kc"; 1657 break; 1658 case PRID_IMP_M14KEC: 1659 c->cputype = CPU_M14KEC; 1660 c->writecombine = _CACHE_UNCACHED; 1661 __cpu_name[cpu] = "MIPS M14KEc"; 1662 break; 1663 case PRID_IMP_1004K: 1664 c->cputype = CPU_1004K; 1665 c->writecombine = _CACHE_UNCACHED; 1666 __cpu_name[cpu] = "MIPS 1004Kc"; 1667 cpu_set_mt_per_tc_perf(c); 1668 break; 1669 case PRID_IMP_1074K: 1670 c->cputype = CPU_1074K; 1671 c->writecombine = _CACHE_UNCACHED; 1672 __cpu_name[cpu] = "MIPS 1074Kc"; 1673 break; 1674 case PRID_IMP_INTERAPTIV_UP: 1675 c->cputype = CPU_INTERAPTIV; 1676 __cpu_name[cpu] = "MIPS interAptiv"; 1677 cpu_set_mt_per_tc_perf(c); 1678 break; 1679 case PRID_IMP_INTERAPTIV_MP: 1680 c->cputype = CPU_INTERAPTIV; 1681 __cpu_name[cpu] = "MIPS interAptiv (multi)"; 1682 cpu_set_mt_per_tc_perf(c); 1683 break; 1684 case PRID_IMP_PROAPTIV_UP: 1685 c->cputype = CPU_PROAPTIV; 1686 __cpu_name[cpu] = "MIPS proAptiv"; 1687 break; 1688 case PRID_IMP_PROAPTIV_MP: 1689 c->cputype = CPU_PROAPTIV; 1690 __cpu_name[cpu] = "MIPS proAptiv (multi)"; 1691 break; 1692 case PRID_IMP_P5600: 1693 c->cputype = CPU_P5600; 1694 __cpu_name[cpu] = "MIPS P5600"; 1695 break; 1696 case PRID_IMP_P6600: 1697 c->cputype = CPU_P6600; 1698 __cpu_name[cpu] = "MIPS P6600"; 1699 break; 1700 case PRID_IMP_I6400: 1701 c->cputype = CPU_I6400; 1702 __cpu_name[cpu] = "MIPS I6400"; 1703 break; 1704 case PRID_IMP_I6500: 1705 c->cputype = CPU_I6500; 1706 __cpu_name[cpu] = "MIPS I6500"; 1707 break; 1708 case PRID_IMP_M5150: 1709 c->cputype = CPU_M5150; 1710 __cpu_name[cpu] = "MIPS M5150"; 1711 break; 1712 case PRID_IMP_M6250: 1713 c->cputype = CPU_M6250; 1714 __cpu_name[cpu] = "MIPS M6250"; 1715 break; 1716 } 1717 1718 decode_configs(c); 1719 1720 spram_config(); 1721 1722 switch (__get_cpu_type(c->cputype)) { 1723 case CPU_I6500: 1724 c->options |= MIPS_CPU_SHARED_FTLB_ENTRIES; 1725 /* fall-through */ 1726 case CPU_I6400: 1727 c->options |= MIPS_CPU_SHARED_FTLB_RAM; 1728 /* fall-through */ 1729 default: 1730 break; 1731 } 1732 } 1733 1734 static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu) 1735 { 1736 decode_configs(c); 1737 switch (c->processor_id & PRID_IMP_MASK) { 1738 case PRID_IMP_AU1_REV1: 1739 case PRID_IMP_AU1_REV2: 1740 c->cputype = CPU_ALCHEMY; 1741 switch ((c->processor_id >> 24) & 0xff) { 1742 case 0: 1743 __cpu_name[cpu] = "Au1000"; 1744 break; 1745 case 1: 1746 __cpu_name[cpu] = "Au1500"; 1747 break; 1748 case 2: 1749 __cpu_name[cpu] = "Au1100"; 1750 break; 1751 case 3: 1752 __cpu_name[cpu] = "Au1550"; 1753 break; 1754 case 4: 1755 __cpu_name[cpu] = "Au1200"; 1756 if ((c->processor_id & PRID_REV_MASK) == 2) 1757 __cpu_name[cpu] = "Au1250"; 1758 break; 1759 case 5: 1760 __cpu_name[cpu] = "Au1210"; 1761 break; 1762 default: 1763 __cpu_name[cpu] = "Au1xxx"; 1764 break; 1765 } 1766 break; 1767 } 1768 } 1769 1770 static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu) 1771 { 1772 decode_configs(c); 1773 1774 c->writecombine = _CACHE_UNCACHED_ACCELERATED; 1775 switch (c->processor_id & PRID_IMP_MASK) { 1776 case PRID_IMP_SB1: 1777 c->cputype = CPU_SB1; 1778 __cpu_name[cpu] = "SiByte SB1"; 1779 /* FPU in pass1 is known to have issues. */ 1780 if ((c->processor_id & PRID_REV_MASK) < 0x02) 1781 c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR); 1782 break; 1783 case PRID_IMP_SB1A: 1784 c->cputype = CPU_SB1A; 1785 __cpu_name[cpu] = "SiByte SB1A"; 1786 break; 1787 } 1788 } 1789 1790 static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu) 1791 { 1792 decode_configs(c); 1793 switch (c->processor_id & PRID_IMP_MASK) { 1794 case PRID_IMP_SR71000: 1795 c->cputype = CPU_SR71000; 1796 __cpu_name[cpu] = "Sandcraft SR71000"; 1797 c->scache.ways = 8; 1798 c->tlbsize = 64; 1799 break; 1800 } 1801 } 1802 1803 static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu) 1804 { 1805 decode_configs(c); 1806 switch (c->processor_id & PRID_IMP_MASK) { 1807 case PRID_IMP_PR4450: 1808 c->cputype = CPU_PR4450; 1809 __cpu_name[cpu] = "Philips PR4450"; 1810 set_isa(c, MIPS_CPU_ISA_M32R1); 1811 break; 1812 } 1813 } 1814 1815 static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu) 1816 { 1817 decode_configs(c); 1818 switch (c->processor_id & PRID_IMP_MASK) { 1819 case PRID_IMP_BMIPS32_REV4: 1820 case PRID_IMP_BMIPS32_REV8: 1821 c->cputype = CPU_BMIPS32; 1822 __cpu_name[cpu] = "Broadcom BMIPS32"; 1823 set_elf_platform(cpu, "bmips32"); 1824 break; 1825 case PRID_IMP_BMIPS3300: 1826 case PRID_IMP_BMIPS3300_ALT: 1827 case PRID_IMP_BMIPS3300_BUG: 1828 c->cputype = CPU_BMIPS3300; 1829 __cpu_name[cpu] = "Broadcom BMIPS3300"; 1830 set_elf_platform(cpu, "bmips3300"); 1831 break; 1832 case PRID_IMP_BMIPS43XX: { 1833 int rev = c->processor_id & PRID_REV_MASK; 1834 1835 if (rev >= PRID_REV_BMIPS4380_LO && 1836 rev <= PRID_REV_BMIPS4380_HI) { 1837 c->cputype = CPU_BMIPS4380; 1838 __cpu_name[cpu] = "Broadcom BMIPS4380"; 1839 set_elf_platform(cpu, "bmips4380"); 1840 c->options |= MIPS_CPU_RIXI; 1841 } else { 1842 c->cputype = CPU_BMIPS4350; 1843 __cpu_name[cpu] = "Broadcom BMIPS4350"; 1844 set_elf_platform(cpu, "bmips4350"); 1845 } 1846 break; 1847 } 1848 case PRID_IMP_BMIPS5000: 1849 case PRID_IMP_BMIPS5200: 1850 c->cputype = CPU_BMIPS5000; 1851 if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_BMIPS5200) 1852 __cpu_name[cpu] = "Broadcom BMIPS5200"; 1853 else 1854 __cpu_name[cpu] = "Broadcom BMIPS5000"; 1855 set_elf_platform(cpu, "bmips5000"); 1856 c->options |= MIPS_CPU_ULRI | MIPS_CPU_RIXI; 1857 break; 1858 } 1859 } 1860 1861 static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu) 1862 { 1863 decode_configs(c); 1864 switch (c->processor_id & PRID_IMP_MASK) { 1865 case PRID_IMP_CAVIUM_CN38XX: 1866 case PRID_IMP_CAVIUM_CN31XX: 1867 case PRID_IMP_CAVIUM_CN30XX: 1868 c->cputype = CPU_CAVIUM_OCTEON; 1869 __cpu_name[cpu] = "Cavium Octeon"; 1870 goto platform; 1871 case PRID_IMP_CAVIUM_CN58XX: 1872 case PRID_IMP_CAVIUM_CN56XX: 1873 case PRID_IMP_CAVIUM_CN50XX: 1874 case PRID_IMP_CAVIUM_CN52XX: 1875 c->cputype = CPU_CAVIUM_OCTEON_PLUS; 1876 __cpu_name[cpu] = "Cavium Octeon+"; 1877 platform: 1878 set_elf_platform(cpu, "octeon"); 1879 break; 1880 case PRID_IMP_CAVIUM_CN61XX: 1881 case PRID_IMP_CAVIUM_CN63XX: 1882 case PRID_IMP_CAVIUM_CN66XX: 1883 case PRID_IMP_CAVIUM_CN68XX: 1884 case PRID_IMP_CAVIUM_CNF71XX: 1885 c->cputype = CPU_CAVIUM_OCTEON2; 1886 __cpu_name[cpu] = "Cavium Octeon II"; 1887 set_elf_platform(cpu, "octeon2"); 1888 break; 1889 case PRID_IMP_CAVIUM_CN70XX: 1890 case PRID_IMP_CAVIUM_CN73XX: 1891 case PRID_IMP_CAVIUM_CNF75XX: 1892 case PRID_IMP_CAVIUM_CN78XX: 1893 c->cputype = CPU_CAVIUM_OCTEON3; 1894 __cpu_name[cpu] = "Cavium Octeon III"; 1895 set_elf_platform(cpu, "octeon3"); 1896 break; 1897 default: 1898 printk(KERN_INFO "Unknown Octeon chip!\n"); 1899 c->cputype = CPU_UNKNOWN; 1900 break; 1901 } 1902 } 1903 1904 static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu) 1905 { 1906 switch (c->processor_id & PRID_IMP_MASK) { 1907 case PRID_IMP_LOONGSON_64C: /* Loongson-2/3 */ 1908 switch (c->processor_id & PRID_REV_MASK) { 1909 case PRID_REV_LOONGSON3A_R2_0: 1910 case PRID_REV_LOONGSON3A_R2_1: 1911 c->cputype = CPU_LOONGSON64; 1912 __cpu_name[cpu] = "ICT Loongson-3"; 1913 set_elf_platform(cpu, "loongson3a"); 1914 set_isa(c, MIPS_CPU_ISA_M64R2); 1915 break; 1916 case PRID_REV_LOONGSON3A_R3_0: 1917 case PRID_REV_LOONGSON3A_R3_1: 1918 c->cputype = CPU_LOONGSON64; 1919 __cpu_name[cpu] = "ICT Loongson-3"; 1920 set_elf_platform(cpu, "loongson3a"); 1921 set_isa(c, MIPS_CPU_ISA_M64R2); 1922 break; 1923 } 1924 1925 decode_configs(c); 1926 c->options |= MIPS_CPU_FTLB | MIPS_CPU_TLBINV | MIPS_CPU_LDPTE; 1927 c->writecombine = _CACHE_UNCACHED_ACCELERATED; 1928 c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM | 1929 MIPS_ASE_LOONGSON_EXT | MIPS_ASE_LOONGSON_EXT2); 1930 break; 1931 case PRID_IMP_LOONGSON_64G: 1932 c->cputype = CPU_LOONGSON64; 1933 __cpu_name[cpu] = "ICT Loongson-3"; 1934 set_elf_platform(cpu, "loongson3a"); 1935 set_isa(c, MIPS_CPU_ISA_M64R2); 1936 decode_configs(c); 1937 c->options |= MIPS_CPU_FTLB | MIPS_CPU_TLBINV | MIPS_CPU_LDPTE; 1938 c->writecombine = _CACHE_UNCACHED_ACCELERATED; 1939 c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM | 1940 MIPS_ASE_LOONGSON_EXT | MIPS_ASE_LOONGSON_EXT2); 1941 break; 1942 default: 1943 panic("Unknown Loongson Processor ID!"); 1944 break; 1945 } 1946 } 1947 1948 static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu) 1949 { 1950 decode_configs(c); 1951 1952 /* 1953 * XBurst misses a config2 register, so config3 decode was skipped in 1954 * decode_configs(). 1955 */ 1956 decode_config3(c); 1957 1958 /* XBurst does not implement the CP0 counter. */ 1959 c->options &= ~MIPS_CPU_COUNTER; 1960 BUG_ON(!__builtin_constant_p(cpu_has_counter) || cpu_has_counter); 1961 1962 switch (c->processor_id & PRID_IMP_MASK) { 1963 case PRID_IMP_XBURST: 1964 c->cputype = CPU_XBURST; 1965 c->writecombine = _CACHE_UNCACHED_ACCELERATED; 1966 __cpu_name[cpu] = "Ingenic JZRISC"; 1967 /* 1968 * The XBurst core by default attempts to avoid branch target 1969 * buffer lookups by detecting & special casing loops. This 1970 * feature will cause BogoMIPS and lpj calculate in error. 1971 * Set cp0 config7 bit 4 to disable this feature. 1972 */ 1973 set_c0_config7(MIPS_CONF7_BTB_LOOP_EN); 1974 break; 1975 default: 1976 panic("Unknown Ingenic Processor ID!"); 1977 break; 1978 } 1979 1980 switch (c->processor_id & PRID_COMP_MASK) { 1981 /* 1982 * The config0 register in the XBurst CPUs with a processor ID of 1983 * PRID_COMP_INGENIC_D1 has an abandoned huge page tlb mode, this 1984 * mode is not compatible with the MIPS standard, it will cause 1985 * tlbmiss and into an infinite loop (line 21 in the tlb-funcs.S) 1986 * when starting the init process. After chip reset, the default 1987 * is HPTLB mode, Write 0xa9000000 to cp0 register 5 sel 4 to 1988 * switch back to VTLB mode to prevent getting stuck. 1989 */ 1990 case PRID_COMP_INGENIC_D1: 1991 write_c0_page_ctrl(XBURST_PAGECTRL_HPTLB_DIS); 1992 break; 1993 /* 1994 * The config0 register in the XBurst CPUs with a processor ID of 1995 * PRID_COMP_INGENIC_D0 report themselves as MIPS32r2 compatible, 1996 * but they don't actually support this ISA. 1997 */ 1998 case PRID_COMP_INGENIC_D0: 1999 c->isa_level &= ~MIPS_CPU_ISA_M32R2; 2000 break; 2001 default: 2002 break; 2003 } 2004 } 2005 2006 static inline void cpu_probe_netlogic(struct cpuinfo_mips *c, int cpu) 2007 { 2008 decode_configs(c); 2009 2010 if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_NETLOGIC_AU13XX) { 2011 c->cputype = CPU_ALCHEMY; 2012 __cpu_name[cpu] = "Au1300"; 2013 /* following stuff is not for Alchemy */ 2014 return; 2015 } 2016 2017 c->options = (MIPS_CPU_TLB | 2018 MIPS_CPU_4KEX | 2019 MIPS_CPU_COUNTER | 2020 MIPS_CPU_DIVEC | 2021 MIPS_CPU_WATCH | 2022 MIPS_CPU_EJTAG | 2023 MIPS_CPU_LLSC); 2024 2025 switch (c->processor_id & PRID_IMP_MASK) { 2026 case PRID_IMP_NETLOGIC_XLP2XX: 2027 case PRID_IMP_NETLOGIC_XLP9XX: 2028 case PRID_IMP_NETLOGIC_XLP5XX: 2029 c->cputype = CPU_XLP; 2030 __cpu_name[cpu] = "Broadcom XLPII"; 2031 break; 2032 2033 case PRID_IMP_NETLOGIC_XLP8XX: 2034 case PRID_IMP_NETLOGIC_XLP3XX: 2035 c->cputype = CPU_XLP; 2036 __cpu_name[cpu] = "Netlogic XLP"; 2037 break; 2038 2039 case PRID_IMP_NETLOGIC_XLR732: 2040 case PRID_IMP_NETLOGIC_XLR716: 2041 case PRID_IMP_NETLOGIC_XLR532: 2042 case PRID_IMP_NETLOGIC_XLR308: 2043 case PRID_IMP_NETLOGIC_XLR532C: 2044 case PRID_IMP_NETLOGIC_XLR516C: 2045 case PRID_IMP_NETLOGIC_XLR508C: 2046 case PRID_IMP_NETLOGIC_XLR308C: 2047 c->cputype = CPU_XLR; 2048 __cpu_name[cpu] = "Netlogic XLR"; 2049 break; 2050 2051 case PRID_IMP_NETLOGIC_XLS608: 2052 case PRID_IMP_NETLOGIC_XLS408: 2053 case PRID_IMP_NETLOGIC_XLS404: 2054 case PRID_IMP_NETLOGIC_XLS208: 2055 case PRID_IMP_NETLOGIC_XLS204: 2056 case PRID_IMP_NETLOGIC_XLS108: 2057 case PRID_IMP_NETLOGIC_XLS104: 2058 case PRID_IMP_NETLOGIC_XLS616B: 2059 case PRID_IMP_NETLOGIC_XLS608B: 2060 case PRID_IMP_NETLOGIC_XLS416B: 2061 case PRID_IMP_NETLOGIC_XLS412B: 2062 case PRID_IMP_NETLOGIC_XLS408B: 2063 case PRID_IMP_NETLOGIC_XLS404B: 2064 c->cputype = CPU_XLR; 2065 __cpu_name[cpu] = "Netlogic XLS"; 2066 break; 2067 2068 default: 2069 pr_info("Unknown Netlogic chip id [%02x]!\n", 2070 c->processor_id); 2071 c->cputype = CPU_XLR; 2072 break; 2073 } 2074 2075 if (c->cputype == CPU_XLP) { 2076 set_isa(c, MIPS_CPU_ISA_M64R2); 2077 c->options |= (MIPS_CPU_FPU | MIPS_CPU_ULRI | MIPS_CPU_MCHECK); 2078 /* This will be updated again after all threads are woken up */ 2079 c->tlbsize = ((read_c0_config6() >> 16) & 0xffff) + 1; 2080 } else { 2081 set_isa(c, MIPS_CPU_ISA_M64R1); 2082 c->tlbsize = ((read_c0_config1() >> 25) & 0x3f) + 1; 2083 } 2084 c->kscratch_mask = 0xf; 2085 } 2086 2087 #ifdef CONFIG_64BIT 2088 /* For use by uaccess.h */ 2089 u64 __ua_limit; 2090 EXPORT_SYMBOL(__ua_limit); 2091 #endif 2092 2093 const char *__cpu_name[NR_CPUS]; 2094 const char *__elf_platform; 2095 2096 void cpu_probe(void) 2097 { 2098 struct cpuinfo_mips *c = ¤t_cpu_data; 2099 unsigned int cpu = smp_processor_id(); 2100 2101 /* 2102 * Set a default elf platform, cpu probe may later 2103 * overwrite it with a more precise value 2104 */ 2105 set_elf_platform(cpu, "mips"); 2106 2107 c->processor_id = PRID_IMP_UNKNOWN; 2108 c->fpu_id = FPIR_IMP_NONE; 2109 c->cputype = CPU_UNKNOWN; 2110 c->writecombine = _CACHE_UNCACHED; 2111 2112 c->fpu_csr31 = FPU_CSR_RN; 2113 c->fpu_msk31 = FPU_CSR_RSVD | FPU_CSR_ABS2008 | FPU_CSR_NAN2008; 2114 2115 c->processor_id = read_c0_prid(); 2116 switch (c->processor_id & PRID_COMP_MASK) { 2117 case PRID_COMP_LEGACY: 2118 cpu_probe_legacy(c, cpu); 2119 break; 2120 case PRID_COMP_MIPS: 2121 cpu_probe_mips(c, cpu); 2122 break; 2123 case PRID_COMP_ALCHEMY: 2124 cpu_probe_alchemy(c, cpu); 2125 break; 2126 case PRID_COMP_SIBYTE: 2127 cpu_probe_sibyte(c, cpu); 2128 break; 2129 case PRID_COMP_BROADCOM: 2130 cpu_probe_broadcom(c, cpu); 2131 break; 2132 case PRID_COMP_SANDCRAFT: 2133 cpu_probe_sandcraft(c, cpu); 2134 break; 2135 case PRID_COMP_NXP: 2136 cpu_probe_nxp(c, cpu); 2137 break; 2138 case PRID_COMP_CAVIUM: 2139 cpu_probe_cavium(c, cpu); 2140 break; 2141 case PRID_COMP_LOONGSON: 2142 cpu_probe_loongson(c, cpu); 2143 break; 2144 case PRID_COMP_INGENIC_D0: 2145 case PRID_COMP_INGENIC_D1: 2146 case PRID_COMP_INGENIC_E1: 2147 cpu_probe_ingenic(c, cpu); 2148 break; 2149 case PRID_COMP_NETLOGIC: 2150 cpu_probe_netlogic(c, cpu); 2151 break; 2152 } 2153 2154 BUG_ON(!__cpu_name[cpu]); 2155 BUG_ON(c->cputype == CPU_UNKNOWN); 2156 2157 /* 2158 * Platform code can force the cpu type to optimize code 2159 * generation. In that case be sure the cpu type is correctly 2160 * manually setup otherwise it could trigger some nasty bugs. 2161 */ 2162 BUG_ON(current_cpu_type() != c->cputype); 2163 2164 if (cpu_has_rixi) { 2165 /* Enable the RIXI exceptions */ 2166 set_c0_pagegrain(PG_IEC); 2167 back_to_back_c0_hazard(); 2168 /* Verify the IEC bit is set */ 2169 if (read_c0_pagegrain() & PG_IEC) 2170 c->options |= MIPS_CPU_RIXIEX; 2171 } 2172 2173 if (mips_fpu_disabled) 2174 c->options &= ~MIPS_CPU_FPU; 2175 2176 if (mips_dsp_disabled) 2177 c->ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P); 2178 2179 if (mips_htw_disabled) { 2180 c->options &= ~MIPS_CPU_HTW; 2181 write_c0_pwctl(read_c0_pwctl() & 2182 ~(1 << MIPS_PWCTL_PWEN_SHIFT)); 2183 } 2184 2185 if (c->options & MIPS_CPU_FPU) 2186 cpu_set_fpu_opts(c); 2187 else 2188 cpu_set_nofpu_opts(c); 2189 2190 if (cpu_has_bp_ghist) 2191 write_c0_r10k_diag(read_c0_r10k_diag() | 2192 R10K_DIAG_E_GHIST); 2193 2194 if (cpu_has_mips_r2_r6) { 2195 c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1; 2196 /* R2 has Performance Counter Interrupt indicator */ 2197 c->options |= MIPS_CPU_PCI; 2198 } 2199 else 2200 c->srsets = 1; 2201 2202 if (cpu_has_mips_r6) 2203 elf_hwcap |= HWCAP_MIPS_R6; 2204 2205 if (cpu_has_msa) { 2206 c->msa_id = cpu_get_msa_id(); 2207 WARN(c->msa_id & MSA_IR_WRPF, 2208 "Vector register partitioning unimplemented!"); 2209 elf_hwcap |= HWCAP_MIPS_MSA; 2210 } 2211 2212 if (cpu_has_mips16) 2213 elf_hwcap |= HWCAP_MIPS_MIPS16; 2214 2215 if (cpu_has_mdmx) 2216 elf_hwcap |= HWCAP_MIPS_MDMX; 2217 2218 if (cpu_has_mips3d) 2219 elf_hwcap |= HWCAP_MIPS_MIPS3D; 2220 2221 if (cpu_has_smartmips) 2222 elf_hwcap |= HWCAP_MIPS_SMARTMIPS; 2223 2224 if (cpu_has_dsp) 2225 elf_hwcap |= HWCAP_MIPS_DSP; 2226 2227 if (cpu_has_dsp2) 2228 elf_hwcap |= HWCAP_MIPS_DSP2; 2229 2230 if (cpu_has_dsp3) 2231 elf_hwcap |= HWCAP_MIPS_DSP3; 2232 2233 if (cpu_has_mips16e2) 2234 elf_hwcap |= HWCAP_MIPS_MIPS16E2; 2235 2236 if (cpu_has_loongson_mmi) 2237 elf_hwcap |= HWCAP_LOONGSON_MMI; 2238 2239 if (cpu_has_loongson_ext) 2240 elf_hwcap |= HWCAP_LOONGSON_EXT; 2241 2242 if (cpu_has_loongson_ext2) 2243 elf_hwcap |= HWCAP_LOONGSON_EXT2; 2244 2245 if (cpu_has_vz) 2246 cpu_probe_vz(c); 2247 2248 cpu_probe_vmbits(c); 2249 2250 #ifdef CONFIG_64BIT 2251 if (cpu == 0) 2252 __ua_limit = ~((1ull << cpu_vmbits) - 1); 2253 #endif 2254 } 2255 2256 void cpu_report(void) 2257 { 2258 struct cpuinfo_mips *c = ¤t_cpu_data; 2259 2260 pr_info("CPU%d revision is: %08x (%s)\n", 2261 smp_processor_id(), c->processor_id, cpu_name_string()); 2262 if (c->options & MIPS_CPU_FPU) 2263 printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id); 2264 if (cpu_has_msa) 2265 pr_info("MSA revision is: %08x\n", c->msa_id); 2266 } 2267 2268 void cpu_set_cluster(struct cpuinfo_mips *cpuinfo, unsigned int cluster) 2269 { 2270 /* Ensure the core number fits in the field */ 2271 WARN_ON(cluster > (MIPS_GLOBALNUMBER_CLUSTER >> 2272 MIPS_GLOBALNUMBER_CLUSTER_SHF)); 2273 2274 cpuinfo->globalnumber &= ~MIPS_GLOBALNUMBER_CLUSTER; 2275 cpuinfo->globalnumber |= cluster << MIPS_GLOBALNUMBER_CLUSTER_SHF; 2276 } 2277 2278 void cpu_set_core(struct cpuinfo_mips *cpuinfo, unsigned int core) 2279 { 2280 /* Ensure the core number fits in the field */ 2281 WARN_ON(core > (MIPS_GLOBALNUMBER_CORE >> MIPS_GLOBALNUMBER_CORE_SHF)); 2282 2283 cpuinfo->globalnumber &= ~MIPS_GLOBALNUMBER_CORE; 2284 cpuinfo->globalnumber |= core << MIPS_GLOBALNUMBER_CORE_SHF; 2285 } 2286 2287 void cpu_set_vpe_id(struct cpuinfo_mips *cpuinfo, unsigned int vpe) 2288 { 2289 /* Ensure the VP(E) ID fits in the field */ 2290 WARN_ON(vpe > (MIPS_GLOBALNUMBER_VP >> MIPS_GLOBALNUMBER_VP_SHF)); 2291 2292 /* Ensure we're not using VP(E)s without support */ 2293 WARN_ON(vpe && !IS_ENABLED(CONFIG_MIPS_MT_SMP) && 2294 !IS_ENABLED(CONFIG_CPU_MIPSR6)); 2295 2296 cpuinfo->globalnumber &= ~MIPS_GLOBALNUMBER_VP; 2297 cpuinfo->globalnumber |= vpe << MIPS_GLOBALNUMBER_VP_SHF; 2298 } 2299