arch/mips/kernel/cpu-probe.c

   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 = &current_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 = &current_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 = &current_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 }