arch/mips/kernel/cpu-probe.c

   1 /*
   2  * Processor capabilities determination functions.
   3  *
   4  * Copyright (C) xxxx  the Anonymous
   5  * Copyright (C) 1994 - 2006 Ralf Baechle
   6  * Copyright (C) 2003, 2004  Maciej W. Rozycki
   7  * Copyright (C) 2001, 2004, 2011, 2012  MIPS Technologies, Inc.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  */
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/ptrace.h>
  17 #include <linux/smp.h>
  18 #include <linux/stddef.h>
  19 #include <linux/export.h>
  20
  21 #include <asm/bugs.h>
  22 #include <asm/cpu.h>
  23 #include <asm/cpu-features.h>
  24 #include <asm/cpu-type.h>
  25 #include <asm/fpu.h>
  26 #include <asm/mipsregs.h>
  27 #include <asm/mipsmtregs.h>
  28 #include <asm/msa.h>
  29 #include <asm/watch.h>
  30 #include <asm/elf.h>
  31 #include <asm/pgtable-bits.h>
  32 #include <asm/spram.h>
  33 #include <asm/uaccess.h>
  34
  35 /* Hardware capabilities */
  36 unsigned int elf_hwcap __read_mostly;
  37
  38 /*
  39  * Get the FPU Implementation/Revision.
  40  */
  41 static inline unsigned long cpu_get_fpu_id(void)
  42 {
  43         unsigned long tmp, fpu_id;
  44
  45         tmp = read_c0_status();
  46         __enable_fpu(FPU_AS_IS);
  47         fpu_id = read_32bit_cp1_register(CP1_REVISION);
  48         write_c0_status(tmp);
  49         return fpu_id;
  50 }
  51
  52 /*
  53  * Check if the CPU has an external FPU.
  54  */
  55 static inline int __cpu_has_fpu(void)
  56 {
  57         return (cpu_get_fpu_id() & FPIR_IMP_MASK) != FPIR_IMP_NONE;
  58 }
  59
  60 static inline unsigned long cpu_get_msa_id(void)
  61 {
  62         unsigned long status, msa_id;
  63
  64         status = read_c0_status();
  65         __enable_fpu(FPU_64BIT);
  66         enable_msa();
  67         msa_id = read_msa_ir();
  68         disable_msa();
  69         write_c0_status(status);
  70         return msa_id;
  71 }
  72
  73 /*
  74  * Determine the FCSR mask for FPU hardware.
  75  */
  76 static inline void cpu_set_fpu_fcsr_mask(struct cpuinfo_mips *c)
  77 {
  78         unsigned long sr, mask, fcsr, fcsr0, fcsr1;
  79
  80         fcsr = c->fpu_csr31;
  81         mask = FPU_CSR_ALL_X | FPU_CSR_ALL_E | FPU_CSR_ALL_S | FPU_CSR_RM;
  82
  83         sr = read_c0_status();
  84         __enable_fpu(FPU_AS_IS);
  85
  86         fcsr0 = fcsr & mask;
  87         write_32bit_cp1_register(CP1_STATUS, fcsr0);
  88         fcsr0 = read_32bit_cp1_register(CP1_STATUS);
  89
  90         fcsr1 = fcsr | ~mask;
  91         write_32bit_cp1_register(CP1_STATUS, fcsr1);
  92         fcsr1 = read_32bit_cp1_register(CP1_STATUS);
  93
  94         write_32bit_cp1_register(CP1_STATUS, fcsr);
  95
  96         write_c0_status(sr);
  97
  98         c->fpu_msk31 = ~(fcsr0 ^ fcsr1) & ~mask;
  99 }
 100
 101 /*
 102  * Determine the IEEE 754 NaN encodings and ABS.fmt/NEG.fmt execution modes
 103  * supported by FPU hardware.
 104  */
 105 static void cpu_set_fpu_2008(struct cpuinfo_mips *c)
 106 {
 107         if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 |
 108                             MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 |
 109                             MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) {
 110                 unsigned long sr, fir, fcsr, fcsr0, fcsr1;
 111
 112                 sr = read_c0_status();
 113                 __enable_fpu(FPU_AS_IS);
 114
 115                 fir = read_32bit_cp1_register(CP1_REVISION);
 116                 if (fir & MIPS_FPIR_HAS2008) {
 117                         fcsr = read_32bit_cp1_register(CP1_STATUS);
 118
 119                         fcsr0 = fcsr & ~(FPU_CSR_ABS2008 | FPU_CSR_NAN2008);
 120                         write_32bit_cp1_register(CP1_STATUS, fcsr0);
 121                         fcsr0 = read_32bit_cp1_register(CP1_STATUS);
 122
 123                         fcsr1 = fcsr | FPU_CSR_ABS2008 | FPU_CSR_NAN2008;
 124                         write_32bit_cp1_register(CP1_STATUS, fcsr1);
 125                         fcsr1 = read_32bit_cp1_register(CP1_STATUS);
 126
 127                         write_32bit_cp1_register(CP1_STATUS, fcsr);
 128
 129                         if (!(fcsr0 & FPU_CSR_NAN2008))
 130                                 c->options |= MIPS_CPU_NAN_LEGACY;
 131                         if (fcsr1 & FPU_CSR_NAN2008)
 132                                 c->options |= MIPS_CPU_NAN_2008;
 133
 134                         if ((fcsr0 ^ fcsr1) & FPU_CSR_ABS2008)
 135                                 c->fpu_msk31 &= ~FPU_CSR_ABS2008;
 136                         else
 137                                 c->fpu_csr31 |= fcsr & FPU_CSR_ABS2008;
 138
 139                         if ((fcsr0 ^ fcsr1) & FPU_CSR_NAN2008)
 140                                 c->fpu_msk31 &= ~FPU_CSR_NAN2008;
 141                         else
 142                                 c->fpu_csr31 |= fcsr & FPU_CSR_NAN2008;
 143                 } else {
 144                         c->options |= MIPS_CPU_NAN_LEGACY;
 145                 }
 146
 147                 write_c0_status(sr);
 148         } else {
 149                 c->options |= MIPS_CPU_NAN_LEGACY;
 150         }
 151 }
 152
 153 /*
 154  * IEEE 754 conformance mode to use.  Affects the NaN encoding and the
 155  * ABS.fmt/NEG.fmt execution mode.
 156  */
 157 static enum { STRICT, LEGACY, STD2008, RELAXED } ieee754 = STRICT;
 158
 159 /*
 160  * Set the IEEE 754 NaN encodings and the ABS.fmt/NEG.fmt execution modes
 161  * to support by the FPU emulator according to the IEEE 754 conformance
 162  * mode selected.  Note that "relaxed" straps the emulator so that it
 163  * allows 2008-NaN binaries even for legacy processors.
 164  */
 165 static void cpu_set_nofpu_2008(struct cpuinfo_mips *c)
 166 {
 167         c->options &= ~(MIPS_CPU_NAN_2008 | MIPS_CPU_NAN_LEGACY);
 168         c->fpu_csr31 &= ~(FPU_CSR_ABS2008 | FPU_CSR_NAN2008);
 169         c->fpu_msk31 &= ~(FPU_CSR_ABS2008 | FPU_CSR_NAN2008);
 170
 171         switch (ieee754) {
 172         case STRICT:
 173                 if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 |
 174                                     MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 |
 175                                     MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) {
 176                         c->options |= MIPS_CPU_NAN_2008 | MIPS_CPU_NAN_LEGACY;
 177                 } else {
 178                         c->options |= MIPS_CPU_NAN_LEGACY;
 179                         c->fpu_msk31 |= FPU_CSR_ABS2008 | FPU_CSR_NAN2008;
 180                 }
 181                 break;
 182         case LEGACY:
 183                 c->options |= MIPS_CPU_NAN_LEGACY;
 184                 c->fpu_msk31 |= FPU_CSR_ABS2008 | FPU_CSR_NAN2008;
 185                 break;
 186         case STD2008:
 187                 c->options |= MIPS_CPU_NAN_2008;
 188                 c->fpu_csr31 |= FPU_CSR_ABS2008 | FPU_CSR_NAN2008;
 189                 c->fpu_msk31 |= FPU_CSR_ABS2008 | FPU_CSR_NAN2008;
 190                 break;
 191         case RELAXED:
 192                 c->options |= MIPS_CPU_NAN_2008 | MIPS_CPU_NAN_LEGACY;
 193                 break;
 194         }
 195 }
 196
 197 /*
 198  * Override the IEEE 754 NaN encoding and ABS.fmt/NEG.fmt execution mode
 199  * according to the "ieee754=" parameter.
 200  */
 201 static void cpu_set_nan_2008(struct cpuinfo_mips *c)
 202 {
 203         switch (ieee754) {
 204         case STRICT:
 205                 mips_use_nan_legacy = !!cpu_has_nan_legacy;
 206                 mips_use_nan_2008 = !!cpu_has_nan_2008;
 207                 break;
 208         case LEGACY:
 209                 mips_use_nan_legacy = !!cpu_has_nan_legacy;
 210                 mips_use_nan_2008 = !cpu_has_nan_legacy;
 211                 break;
 212         case STD2008:
 213                 mips_use_nan_legacy = !cpu_has_nan_2008;
 214                 mips_use_nan_2008 = !!cpu_has_nan_2008;
 215                 break;
 216         case RELAXED:
 217                 mips_use_nan_legacy = true;
 218                 mips_use_nan_2008 = true;
 219                 break;
 220         }
 221 }
 222
 223 /*
 224  * IEEE 754 NaN encoding and ABS.fmt/NEG.fmt execution mode override
 225  * settings:
 226  *
 227  * strict:  accept binaries that request a NaN encoding supported by the FPU
 228  * legacy:  only accept legacy-NaN binaries
 229  * 2008:    only accept 2008-NaN binaries
 230  * relaxed: accept any binaries regardless of whether supported by the FPU
 231  */
 232 static int __init ieee754_setup(char *s)
 233 {
 234         if (!s)
 235                 return -1;
 236         else if (!strcmp(s, "strict"))
 237                 ieee754 = STRICT;
 238         else if (!strcmp(s, "legacy"))
 239                 ieee754 = LEGACY;
 240         else if (!strcmp(s, "2008"))
 241                 ieee754 = STD2008;
 242         else if (!strcmp(s, "relaxed"))
 243                 ieee754 = RELAXED;
 244         else
 245                 return -1;
 246
 247         if (!(boot_cpu_data.options & MIPS_CPU_FPU))
 248                 cpu_set_nofpu_2008(&boot_cpu_data);
 249         cpu_set_nan_2008(&boot_cpu_data);
 250
 251         return 0;
 252 }
 253
 254 early_param("ieee754", ieee754_setup);
 255
 256 /*
 257  * Set the FIR feature flags for the FPU emulator.
 258  */
 259 static void cpu_set_nofpu_id(struct cpuinfo_mips *c)
 260 {
 261         u32 value;
 262
 263         value = 0;
 264         if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 |
 265                             MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 |
 266                             MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6))
 267                 value |= MIPS_FPIR_D | MIPS_FPIR_S;
 268         if (c->isa_level & (MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 |
 269                             MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6))
 270                 value |= MIPS_FPIR_F64 | MIPS_FPIR_L | MIPS_FPIR_W;
 271         if (c->options & MIPS_CPU_NAN_2008)
 272                 value |= MIPS_FPIR_HAS2008;
 273         c->fpu_id = value;
 274 }
 275
 276 /* Determined FPU emulator mask to use for the boot CPU with "nofpu".  */
 277 static unsigned int mips_nofpu_msk31;
 278
 279 /*
 280  * Set options for FPU hardware.
 281  */
 282 static void cpu_set_fpu_opts(struct cpuinfo_mips *c)
 283 {
 284         c->fpu_id = cpu_get_fpu_id();
 285         mips_nofpu_msk31 = c->fpu_msk31;
 286
 287         if (c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1 |
 288                             MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2 |
 289                             MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6)) {
 290                 if (c->fpu_id & MIPS_FPIR_3D)
 291                         c->ases |= MIPS_ASE_MIPS3D;
 292                 if (c->fpu_id & MIPS_FPIR_FREP)
 293                         c->options |= MIPS_CPU_FRE;
 294         }
 295
 296         cpu_set_fpu_fcsr_mask(c);
 297         cpu_set_fpu_2008(c);
 298         cpu_set_nan_2008(c);
 299 }
 300
 301 /*
 302  * Set options for the FPU emulator.
 303  */
 304 static void cpu_set_nofpu_opts(struct cpuinfo_mips *c)
 305 {
 306         c->options &= ~MIPS_CPU_FPU;
 307         c->fpu_msk31 = mips_nofpu_msk31;
 308
 309         cpu_set_nofpu_2008(c);
 310         cpu_set_nan_2008(c);
 311         cpu_set_nofpu_id(c);
 312 }
 313
 314 static int mips_fpu_disabled;
 315
 316 static int __init fpu_disable(char *s)
 317 {
 318         cpu_set_nofpu_opts(&boot_cpu_data);
 319         mips_fpu_disabled = 1;
 320
 321         return 1;
 322 }
 323
 324 __setup("nofpu", fpu_disable);
 325
 326 int mips_dsp_disabled;
 327
 328 static int __init dsp_disable(char *s)
 329 {
 330         cpu_data[0].ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P);
 331         mips_dsp_disabled = 1;
 332
 333         return 1;
 334 }
 335
 336 __setup("nodsp", dsp_disable);
 337
 338 static int mips_htw_disabled;
 339
 340 static int __init htw_disable(char *s)
 341 {
 342         mips_htw_disabled = 1;
 343         cpu_data[0].options &= ~MIPS_CPU_HTW;
 344         write_c0_pwctl(read_c0_pwctl() &
 345                        ~(1 << MIPS_PWCTL_PWEN_SHIFT));
 346
 347         return 1;
 348 }
 349
 350 __setup("nohtw", htw_disable);
 351
 352 static int mips_ftlb_disabled;
 353 static int mips_has_ftlb_configured;
 354
 355 static int set_ftlb_enable(struct cpuinfo_mips *c, int enable);
 356
 357 static int __init ftlb_disable(char *s)
 358 {
 359         unsigned int config4, mmuextdef;
 360
 361         /*
 362          * If the core hasn't done any FTLB configuration, there is nothing
 363          * for us to do here.
 364          */
 365         if (!mips_has_ftlb_configured)
 366                 return 1;
 367
 368         /* Disable it in the boot cpu */
 369         if (set_ftlb_enable(&cpu_data[0], 0)) {
 370                 pr_warn("Can't turn FTLB off\n");
 371                 return 1;
 372         }
 373
 374         back_to_back_c0_hazard();
 375
 376         config4 = read_c0_config4();
 377
 378         /* Check that FTLB has been disabled */
 379         mmuextdef = config4 & MIPS_CONF4_MMUEXTDEF;
 380         /* MMUSIZEEXT == VTLB ON, FTLB OFF */
 381         if (mmuextdef == MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT) {
 382                 /* This should never happen */
 383                 pr_warn("FTLB could not be disabled!\n");
 384                 return 1;
 385         }
 386
 387         mips_ftlb_disabled = 1;
 388         mips_has_ftlb_configured = 0;
 389
 390         /*
 391          * noftlb is mainly used for debug purposes so print
 392          * an informative message instead of using pr_debug()
 393          */
 394         pr_info("FTLB has been disabled\n");
 395
 396         /*
 397          * Some of these bits are duplicated in the decode_config4.
 398          * MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT is the only possible case
 399          * once FTLB has been disabled so undo what decode_config4 did.
 400          */
 401         cpu_data[0].tlbsize -= cpu_data[0].tlbsizeftlbways *
 402                                cpu_data[0].tlbsizeftlbsets;
 403         cpu_data[0].tlbsizeftlbsets = 0;
 404         cpu_data[0].tlbsizeftlbways = 0;
 405
 406         return 1;
 407 }
 408
 409 __setup("noftlb", ftlb_disable);
 410
 411
 412 static inline void check_errata(void)
 413 {
 414         struct cpuinfo_mips *c = &current_cpu_data;
 415
 416         switch (current_cpu_type()) {
 417         case CPU_34K:
 418                 /*
 419                  * Erratum "RPS May Cause Incorrect Instruction Execution"
 420                  * This code only handles VPE0, any SMP/RTOS code
 421                  * making use of VPE1 will be responsable for that VPE.
 422                  */
 423                 if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_34K_V1_0_2)
 424                         write_c0_config7(read_c0_config7() | MIPS_CONF7_RPS);
 425                 break;
 426         default:
 427                 break;
 428         }
 429 }
 430
 431 void __init check_bugs32(void)
 432 {
 433         check_errata();
 434 }
 435
 436 /*
 437  * Probe whether cpu has config register by trying to play with
 438  * alternate cache bit and see whether it matters.
 439  * It's used by cpu_probe to distinguish between R3000A and R3081.
 440  */
 441 static inline int cpu_has_confreg(void)
 442 {
 443 #ifdef CONFIG_CPU_R3000
 444         extern unsigned long r3k_cache_size(unsigned long);
 445         unsigned long size1, size2;
 446         unsigned long cfg = read_c0_conf();
 447
 448         size1 = r3k_cache_size(ST0_ISC);
 449         write_c0_conf(cfg ^ R30XX_CONF_AC);
 450         size2 = r3k_cache_size(ST0_ISC);
 451         write_c0_conf(cfg);
 452         return size1 != size2;
 453 #else
 454         return 0;
 455 #endif
 456 }
 457
 458 static inline void set_elf_platform(int cpu, const char *plat)
 459 {
 460         if (cpu == 0)
 461                 __elf_platform = plat;
 462 }
 463
 464 static inline void cpu_probe_vmbits(struct cpuinfo_mips *c)
 465 {
 466 #ifdef __NEED_VMBITS_PROBE
 467         write_c0_entryhi(0x3fffffffffffe000ULL);
 468         back_to_back_c0_hazard();
 469         c->vmbits = fls64(read_c0_entryhi() & 0x3fffffffffffe000ULL);
 470 #endif
 471 }
 472
 473 static void set_isa(struct cpuinfo_mips *c, unsigned int isa)
 474 {
 475         switch (isa) {
 476         case MIPS_CPU_ISA_M64R2:
 477                 c->isa_level |= MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2;
 478         case MIPS_CPU_ISA_M64R1:
 479                 c->isa_level |= MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1;
 480         case MIPS_CPU_ISA_V:
 481                 c->isa_level |= MIPS_CPU_ISA_V;
 482         case MIPS_CPU_ISA_IV:
 483                 c->isa_level |= MIPS_CPU_ISA_IV;
 484         case MIPS_CPU_ISA_III:
 485                 c->isa_level |= MIPS_CPU_ISA_II | MIPS_CPU_ISA_III;
 486                 break;
 487
 488         /* R6 incompatible with everything else */
 489         case MIPS_CPU_ISA_M64R6:
 490                 c->isa_level |= MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6;
 491         case MIPS_CPU_ISA_M32R6:
 492                 c->isa_level |= MIPS_CPU_ISA_M32R6;
 493                 /* Break here so we don't add incompatible ISAs */
 494                 break;
 495         case MIPS_CPU_ISA_M32R2:
 496                 c->isa_level |= MIPS_CPU_ISA_M32R2;
 497         case MIPS_CPU_ISA_M32R1:
 498                 c->isa_level |= MIPS_CPU_ISA_M32R1;
 499         case MIPS_CPU_ISA_II:
 500                 c->isa_level |= MIPS_CPU_ISA_II;
 501                 break;
 502         }
 503 }
 504
 505 static char unknown_isa[] = KERN_ERR \
 506         "Unsupported ISA type, c0.config0: %d.";
 507
 508 static unsigned int calculate_ftlb_probability(struct cpuinfo_mips *c)
 509 {
 510
 511         unsigned int probability = c->tlbsize / c->tlbsizevtlb;
 512
 513         /*
 514          * 0 = All TLBWR instructions go to FTLB
 515          * 1 = 15:1: For every 16 TBLWR instructions, 15 go to the
 516          * FTLB and 1 goes to the VTLB.
 517          * 2 = 7:1: As above with 7:1 ratio.
 518          * 3 = 3:1: As above with 3:1 ratio.
 519          *
 520          * Use the linear midpoint as the probability threshold.
 521          */
 522         if (probability >= 12)
 523                 return 1;
 524         else if (probability >= 6)
 525                 return 2;
 526         else
 527                 /*
 528                  * So FTLB is less than 4 times bigger than VTLB.
 529                  * A 3:1 ratio can still be useful though.
 530                  */
 531                 return 3;
 532 }
 533
 534 static int set_ftlb_enable(struct cpuinfo_mips *c, int enable)
 535 {
 536         unsigned int config;
 537
 538         /* It's implementation dependent how the FTLB can be enabled */
 539         switch (c->cputype) {
 540         case CPU_PROAPTIV:
 541         case CPU_P5600:
 542                 /* proAptiv & related cores use Config6 to enable the FTLB */
 543                 config = read_c0_config6();
 544                 /* Clear the old probability value */
 545                 config &= ~(3 << MIPS_CONF6_FTLBP_SHIFT);
 546                 if (enable)
 547                         /* Enable FTLB */
 548                         write_c0_config6(config |
 549                                          (calculate_ftlb_probability(c)
 550                                           << MIPS_CONF6_FTLBP_SHIFT)
 551                                          | MIPS_CONF6_FTLBEN);
 552                 else
 553                         /* Disable FTLB */
 554                         write_c0_config6(config &  ~MIPS_CONF6_FTLBEN);
 555                 break;
 556         case CPU_I6400:
 557                 /* I6400 & related cores use Config7 to configure FTLB */
 558                 config = read_c0_config7();
 559                 /* Clear the old probability value */
 560                 config &= ~(3 << MIPS_CONF7_FTLBP_SHIFT);
 561                 write_c0_config7(config | (calculate_ftlb_probability(c)
 562                                            << MIPS_CONF7_FTLBP_SHIFT));
 563                 break;
 564         default:
 565                 return 1;
 566         }
 567
 568         return 0;
 569 }
 570
 571 static inline unsigned int decode_config0(struct cpuinfo_mips *c)
 572 {
 573         unsigned int config0;
 574         int isa, mt;
 575
 576         config0 = read_c0_config();
 577
 578         /*
 579          * Look for Standard TLB or Dual VTLB and FTLB
 580          */
 581         mt = config0 & MIPS_CONF_MT;
 582         if (mt == MIPS_CONF_MT_TLB)
 583                 c->options |= MIPS_CPU_TLB;
 584         else if (mt == MIPS_CONF_MT_FTLB)
 585                 c->options |= MIPS_CPU_TLB | MIPS_CPU_FTLB;
 586
 587         isa = (config0 & MIPS_CONF_AT) >> 13;
 588         switch (isa) {
 589         case 0:
 590                 switch ((config0 & MIPS_CONF_AR) >> 10) {
 591                 case 0:
 592                         set_isa(c, MIPS_CPU_ISA_M32R1);
 593                         break;
 594                 case 1:
 595                         set_isa(c, MIPS_CPU_ISA_M32R2);
 596                         break;
 597                 case 2:
 598                         set_isa(c, MIPS_CPU_ISA_M32R6);
 599                         break;
 600                 default:
 601                         goto unknown;
 602                 }
 603                 break;
 604         case 2:
 605                 switch ((config0 & MIPS_CONF_AR) >> 10) {
 606                 case 0:
 607                         set_isa(c, MIPS_CPU_ISA_M64R1);
 608                         break;
 609                 case 1:
 610                         set_isa(c, MIPS_CPU_ISA_M64R2);
 611                         break;
 612                 case 2:
 613                         set_isa(c, MIPS_CPU_ISA_M64R6);
 614                         break;
 615                 default:
 616                         goto unknown;
 617                 }
 618                 break;
 619         default:
 620                 goto unknown;
 621         }
 622
 623         return config0 & MIPS_CONF_M;
 624
 625 unknown:
 626         panic(unknown_isa, config0);
 627 }
 628
 629 static inline unsigned int decode_config1(struct cpuinfo_mips *c)
 630 {
 631         unsigned int config1;
 632
 633         config1 = read_c0_config1();
 634
 635         if (config1 & MIPS_CONF1_MD)
 636                 c->ases |= MIPS_ASE_MDMX;
 637         if (config1 & MIPS_CONF1_WR)
 638                 c->options |= MIPS_CPU_WATCH;
 639         if (config1 & MIPS_CONF1_CA)
 640                 c->ases |= MIPS_ASE_MIPS16;
 641         if (config1 & MIPS_CONF1_EP)
 642                 c->options |= MIPS_CPU_EJTAG;
 643         if (config1 & MIPS_CONF1_FP) {
 644                 c->options |= MIPS_CPU_FPU;
 645                 c->options |= MIPS_CPU_32FPR;
 646         }
 647         if (cpu_has_tlb) {
 648                 c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1;
 649                 c->tlbsizevtlb = c->tlbsize;
 650                 c->tlbsizeftlbsets = 0;
 651         }
 652
 653         return config1 & MIPS_CONF_M;
 654 }
 655
 656 static inline unsigned int decode_config2(struct cpuinfo_mips *c)
 657 {
 658         unsigned int config2;
 659
 660         config2 = read_c0_config2();
 661
 662         if (config2 & MIPS_CONF2_SL)
 663                 c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
 664
 665         return config2 & MIPS_CONF_M;
 666 }
 667
 668 static inline unsigned int decode_config3(struct cpuinfo_mips *c)
 669 {
 670         unsigned int config3;
 671
 672         config3 = read_c0_config3();
 673
 674         if (config3 & MIPS_CONF3_SM) {
 675                 c->ases |= MIPS_ASE_SMARTMIPS;
 676                 c->options |= MIPS_CPU_RIXI;
 677         }
 678         if (config3 & MIPS_CONF3_RXI)
 679                 c->options |= MIPS_CPU_RIXI;
 680         if (config3 & MIPS_CONF3_DSP)
 681                 c->ases |= MIPS_ASE_DSP;
 682         if (config3 & MIPS_CONF3_DSP2P)
 683                 c->ases |= MIPS_ASE_DSP2P;
 684         if (config3 & MIPS_CONF3_VINT)
 685                 c->options |= MIPS_CPU_VINT;
 686         if (config3 & MIPS_CONF3_VEIC)
 687                 c->options |= MIPS_CPU_VEIC;
 688         if (config3 & MIPS_CONF3_MT)
 689                 c->ases |= MIPS_ASE_MIPSMT;
 690         if (config3 & MIPS_CONF3_ULRI)
 691                 c->options |= MIPS_CPU_ULRI;
 692         if (config3 & MIPS_CONF3_ISA)
 693                 c->options |= MIPS_CPU_MICROMIPS;
 694         if (config3 & MIPS_CONF3_VZ)
 695                 c->ases |= MIPS_ASE_VZ;
 696         if (config3 & MIPS_CONF3_SC)
 697                 c->options |= MIPS_CPU_SEGMENTS;
 698         if (config3 & MIPS_CONF3_MSA)
 699                 c->ases |= MIPS_ASE_MSA;
 700         if (config3 & MIPS_CONF3_PW) {
 701                 c->htw_seq = 0;
 702                 c->options |= MIPS_CPU_HTW;
 703         }
 704         if (config3 & MIPS_CONF3_CDMM)
 705                 c->options |= MIPS_CPU_CDMM;
 706         if (config3 & MIPS_CONF3_SP)
 707                 c->options |= MIPS_CPU_SP;
 708
 709         return config3 & MIPS_CONF_M;
 710 }
 711
 712 static inline unsigned int decode_config4(struct cpuinfo_mips *c)
 713 {
 714         unsigned int config4;
 715         unsigned int newcf4;
 716         unsigned int mmuextdef;
 717         unsigned int ftlb_page = MIPS_CONF4_FTLBPAGESIZE;
 718
 719         config4 = read_c0_config4();
 720
 721         if (cpu_has_tlb) {
 722                 if (((config4 & MIPS_CONF4_IE) >> 29) == 2)
 723                         c->options |= MIPS_CPU_TLBINV;
 724
 725                 /*
 726                  * R6 has dropped the MMUExtDef field from config4.
 727                  * On R6 the fields always describe the FTLB, and only if it is
 728                  * present according to Config.MT.
 729                  */
 730                 if (!cpu_has_mips_r6)
 731                         mmuextdef = config4 & MIPS_CONF4_MMUEXTDEF;
 732                 else if (cpu_has_ftlb)
 733                         mmuextdef = MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT;
 734                 else
 735                         mmuextdef = 0;
 736
 737                 switch (mmuextdef) {
 738                 case MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT:
 739                         c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40;
 740                         c->tlbsizevtlb = c->tlbsize;
 741                         break;
 742                 case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
 743                         c->tlbsizevtlb +=
 744                                 ((config4 & MIPS_CONF4_VTLBSIZEEXT) >>
 745                                   MIPS_CONF4_VTLBSIZEEXT_SHIFT) * 0x40;
 746                         c->tlbsize = c->tlbsizevtlb;
 747                         ftlb_page = MIPS_CONF4_VFTLBPAGESIZE;
 748                         /* fall through */
 749                 case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
 750                         if (mips_ftlb_disabled)
 751                                 break;
 752                         newcf4 = (config4 & ~ftlb_page) |
 753                                 (page_size_ftlb(mmuextdef) <<
 754                                  MIPS_CONF4_FTLBPAGESIZE_SHIFT);
 755                         write_c0_config4(newcf4);
 756                         back_to_back_c0_hazard();
 757                         config4 = read_c0_config4();
 758                         if (config4 != newcf4) {
 759                                 pr_err("PAGE_SIZE 0x%lx is not supported by FTLB (config4=0x%x)\n",
 760                                        PAGE_SIZE, config4);
 761                                 /* Switch FTLB off */
 762                                 set_ftlb_enable(c, 0);
 763                                 break;
 764                         }
 765                         c->tlbsizeftlbsets = 1 <<
 766                                 ((config4 & MIPS_CONF4_FTLBSETS) >>
 767                                  MIPS_CONF4_FTLBSETS_SHIFT);
 768                         c->tlbsizeftlbways = ((config4 & MIPS_CONF4_FTLBWAYS) >>
 769                                               MIPS_CONF4_FTLBWAYS_SHIFT) + 2;
 770                         c->tlbsize += c->tlbsizeftlbways * c->tlbsizeftlbsets;
 771                         mips_has_ftlb_configured = 1;
 772                         break;
 773                 }
 774         }
 775
 776         c->kscratch_mask = (config4 >> 16) & 0xff;
 777
 778         return config4 & MIPS_CONF_M;
 779 }
 780
 781 static inline unsigned int decode_config5(struct cpuinfo_mips *c)
 782 {
 783         unsigned int config5;
 784
 785         config5 = read_c0_config5();
 786         config5 &= ~(MIPS_CONF5_UFR | MIPS_CONF5_UFE);
 787         write_c0_config5(config5);
 788
 789         if (config5 & MIPS_CONF5_EVA)
 790                 c->options |= MIPS_CPU_EVA;
 791         if (config5 & MIPS_CONF5_MRP)
 792                 c->options |= MIPS_CPU_MAAR;
 793         if (config5 & MIPS_CONF5_LLB)
 794                 c->options |= MIPS_CPU_RW_LLB;
 795 #ifdef CONFIG_XPA
 796         if (config5 & MIPS_CONF5_MVH)
 797                 c->options |= MIPS_CPU_XPA;
 798 #endif
 799
 800         return config5 & MIPS_CONF_M;
 801 }
 802
 803 static void decode_configs(struct cpuinfo_mips *c)
 804 {
 805         int ok;
 806
 807         /* MIPS32 or MIPS64 compliant CPU.  */
 808         c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER |
 809                      MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK;
 810
 811         c->scache.flags = MIPS_CACHE_NOT_PRESENT;
 812
 813         /* Enable FTLB if present and not disabled */
 814         set_ftlb_enable(c, !mips_ftlb_disabled);
 815
 816         ok = decode_config0(c);                 /* Read Config registers.  */
 817         BUG_ON(!ok);                            /* Arch spec violation!  */
 818         if (ok)
 819                 ok = decode_config1(c);
 820         if (ok)
 821                 ok = decode_config2(c);
 822         if (ok)
 823                 ok = decode_config3(c);
 824         if (ok)
 825                 ok = decode_config4(c);
 826         if (ok)
 827                 ok = decode_config5(c);
 828
 829         mips_probe_watch_registers(c);
 830
 831         if (cpu_has_rixi) {
 832                 /* Enable the RIXI exceptions */
 833                 set_c0_pagegrain(PG_IEC);
 834                 back_to_back_c0_hazard();
 835                 /* Verify the IEC bit is set */
 836                 if (read_c0_pagegrain() & PG_IEC)
 837                         c->options |= MIPS_CPU_RIXIEX;
 838         }
 839
 840 #ifndef CONFIG_MIPS_CPS
 841         if (cpu_has_mips_r2_r6) {
 842                 c->core = get_ebase_cpunum();
 843                 if (cpu_has_mipsmt)
 844                         c->core >>= fls(core_nvpes()) - 1;
 845         }
 846 #endif
 847 }
 848
 849 #define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \
 850                 | MIPS_CPU_COUNTER)
 851
 852 static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
 853 {
 854         switch (c->processor_id & PRID_IMP_MASK) {
 855         case PRID_IMP_R2000:
 856                 c->cputype = CPU_R2000;
 857                 __cpu_name[cpu] = "R2000";
 858                 c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
 859                 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
 860                              MIPS_CPU_NOFPUEX;
 861                 if (__cpu_has_fpu())
 862                         c->options |= MIPS_CPU_FPU;
 863                 c->tlbsize = 64;
 864                 break;
 865         case PRID_IMP_R3000:
 866                 if ((c->processor_id & PRID_REV_MASK) == PRID_REV_R3000A) {
 867                         if (cpu_has_confreg()) {
 868                                 c->cputype = CPU_R3081E;
 869                                 __cpu_name[cpu] = "R3081";
 870                         } else {
 871                                 c->cputype = CPU_R3000A;
 872                                 __cpu_name[cpu] = "R3000A";
 873                         }
 874                 } else {
 875                         c->cputype = CPU_R3000;
 876                         __cpu_name[cpu] = "R3000";
 877                 }
 878                 c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
 879                 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
 880                              MIPS_CPU_NOFPUEX;
 881                 if (__cpu_has_fpu())
 882                         c->options |= MIPS_CPU_FPU;
 883                 c->tlbsize = 64;
 884                 break;
 885         case PRID_IMP_R4000:
 886                 if (read_c0_config() & CONF_SC) {
 887                         if ((c->processor_id & PRID_REV_MASK) >=
 888                             PRID_REV_R4400) {
 889                                 c->cputype = CPU_R4400PC;
 890                                 __cpu_name[cpu] = "R4400PC";
 891                         } else {
 892                                 c->cputype = CPU_R4000PC;
 893                                 __cpu_name[cpu] = "R4000PC";
 894                         }
 895                 } else {
 896                         int cca = read_c0_config() & CONF_CM_CMASK;
 897                         int mc;
 898
 899                         /*
 900                          * SC and MC versions can't be reliably told apart,
 901                          * but only the latter support coherent caching
 902                          * modes so assume the firmware has set the KSEG0
 903                          * coherency attribute reasonably (if uncached, we
 904                          * assume SC).
 905                          */
 906                         switch (cca) {
 907                         case CONF_CM_CACHABLE_CE:
 908                         case CONF_CM_CACHABLE_COW:
 909                         case CONF_CM_CACHABLE_CUW:
 910                                 mc = 1;
 911                                 break;
 912                         default:
 913                                 mc = 0;
 914                                 break;
 915                         }
 916                         if ((c->processor_id & PRID_REV_MASK) >=
 917                             PRID_REV_R4400) {
 918                                 c->cputype = mc ? CPU_R4400MC : CPU_R4400SC;
 919                                 __cpu_name[cpu] = mc ? "R4400MC" : "R4400SC";
 920                         } else {
 921                                 c->cputype = mc ? CPU_R4000MC : CPU_R4000SC;
 922                                 __cpu_name[cpu] = mc ? "R4000MC" : "R4000SC";
 923                         }
 924                 }
 925
 926                 set_isa(c, MIPS_CPU_ISA_III);
 927                 c->fpu_msk31 |= FPU_CSR_CONDX;
 928                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
 929                              MIPS_CPU_WATCH | MIPS_CPU_VCE |
 930                              MIPS_CPU_LLSC;
 931                 c->tlbsize = 48;
 932                 break;
 933         case PRID_IMP_VR41XX:
 934                 set_isa(c, MIPS_CPU_ISA_III);
 935                 c->fpu_msk31 |= FPU_CSR_CONDX;
 936                 c->options = R4K_OPTS;
 937                 c->tlbsize = 32;
 938                 switch (c->processor_id & 0xf0) {
 939                 case PRID_REV_VR4111:
 940                         c->cputype = CPU_VR4111;
 941                         __cpu_name[cpu] = "NEC VR4111";
 942                         break;
 943                 case PRID_REV_VR4121:
 944                         c->cputype = CPU_VR4121;
 945                         __cpu_name[cpu] = "NEC VR4121";
 946                         break;
 947                 case PRID_REV_VR4122:
 948                         if ((c->processor_id & 0xf) < 0x3) {
 949                                 c->cputype = CPU_VR4122;
 950                                 __cpu_name[cpu] = "NEC VR4122";
 951                         } else {
 952                                 c->cputype = CPU_VR4181A;
 953                                 __cpu_name[cpu] = "NEC VR4181A";
 954                         }
 955                         break;
 956                 case PRID_REV_VR4130:
 957                         if ((c->processor_id & 0xf) < 0x4) {
 958                                 c->cputype = CPU_VR4131;
 959                                 __cpu_name[cpu] = "NEC VR4131";
 960                         } else {
 961                                 c->cputype = CPU_VR4133;
 962                                 c->options |= MIPS_CPU_LLSC;
 963                                 __cpu_name[cpu] = "NEC VR4133";
 964                         }
 965                         break;
 966                 default:
 967                         printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n");
 968                         c->cputype = CPU_VR41XX;
 969                         __cpu_name[cpu] = "NEC Vr41xx";
 970                         break;
 971                 }
 972                 break;
 973         case PRID_IMP_R4300:
 974                 c->cputype = CPU_R4300;
 975                 __cpu_name[cpu] = "R4300";
 976                 set_isa(c, MIPS_CPU_ISA_III);
 977                 c->fpu_msk31 |= FPU_CSR_CONDX;
 978                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
 979                              MIPS_CPU_LLSC;
 980                 c->tlbsize = 32;
 981                 break;
 982         case PRID_IMP_R4600:
 983                 c->cputype = CPU_R4600;
 984                 __cpu_name[cpu] = "R4600";
 985                 set_isa(c, MIPS_CPU_ISA_III);
 986                 c->fpu_msk31 |= FPU_CSR_CONDX;
 987                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
 988                              MIPS_CPU_LLSC;
 989                 c->tlbsize = 48;
 990                 break;
 991         #if 0
 992         case PRID_IMP_R4650:
 993                 /*
 994                  * This processor doesn't have an MMU, so it's not
 995                  * "real easy" to run Linux on it. It is left purely
 996                  * for documentation.  Commented out because it shares
 997                  * it's c0_prid id number with the TX3900.
 998                  */
 999                 c->cputype = CPU_R4650;
1000                 __cpu_name[cpu] = "R4650";
1001                 set_isa(c, MIPS_CPU_ISA_III);
1002                 c->fpu_msk31 |= FPU_CSR_CONDX;
1003                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
1004                 c->tlbsize = 48;
1005                 break;
1006         #endif
1007         case PRID_IMP_TX39:
1008                 c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
1009                 c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE;
1010
1011                 if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) {
1012                         c->cputype = CPU_TX3927;
1013                         __cpu_name[cpu] = "TX3927";
1014                         c->tlbsize = 64;
1015                 } else {
1016                         switch (c->processor_id & PRID_REV_MASK) {
1017                         case PRID_REV_TX3912:
1018                                 c->cputype = CPU_TX3912;
1019                                 __cpu_name[cpu] = "TX3912";
1020                                 c->tlbsize = 32;
1021                                 break;
1022                         case PRID_REV_TX3922:
1023                                 c->cputype = CPU_TX3922;
1024                                 __cpu_name[cpu] = "TX3922";
1025                                 c->tlbsize = 64;
1026                                 break;
1027                         }
1028                 }
1029                 break;
1030         case PRID_IMP_R4700:
1031                 c->cputype = CPU_R4700;
1032                 __cpu_name[cpu] = "R4700";
1033                 set_isa(c, MIPS_CPU_ISA_III);
1034                 c->fpu_msk31 |= FPU_CSR_CONDX;
1035                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1036                              MIPS_CPU_LLSC;
1037                 c->tlbsize = 48;
1038                 break;
1039         case PRID_IMP_TX49:
1040                 c->cputype = CPU_TX49XX;
1041                 __cpu_name[cpu] = "R49XX";
1042                 set_isa(c, MIPS_CPU_ISA_III);
1043                 c->fpu_msk31 |= FPU_CSR_CONDX;
1044                 c->options = R4K_OPTS | MIPS_CPU_LLSC;
1045                 if (!(c->processor_id & 0x08))
1046                         c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR;
1047                 c->tlbsize = 48;
1048                 break;
1049         case PRID_IMP_R5000:
1050                 c->cputype = CPU_R5000;
1051                 __cpu_name[cpu] = "R5000";
1052                 set_isa(c, MIPS_CPU_ISA_IV);
1053                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1054                              MIPS_CPU_LLSC;
1055                 c->tlbsize = 48;
1056                 break;
1057         case PRID_IMP_R5432:
1058                 c->cputype = CPU_R5432;
1059                 __cpu_name[cpu] = "R5432";
1060                 set_isa(c, MIPS_CPU_ISA_IV);
1061                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1062                              MIPS_CPU_WATCH | MIPS_CPU_LLSC;
1063                 c->tlbsize = 48;
1064                 break;
1065         case PRID_IMP_R5500:
1066                 c->cputype = CPU_R5500;
1067                 __cpu_name[cpu] = "R5500";
1068                 set_isa(c, MIPS_CPU_ISA_IV);
1069                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1070                              MIPS_CPU_WATCH | MIPS_CPU_LLSC;
1071                 c->tlbsize = 48;
1072                 break;
1073         case PRID_IMP_NEVADA:
1074                 c->cputype = CPU_NEVADA;
1075                 __cpu_name[cpu] = "Nevada";
1076                 set_isa(c, MIPS_CPU_ISA_IV);
1077                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1078                              MIPS_CPU_DIVEC | MIPS_CPU_LLSC;
1079                 c->tlbsize = 48;
1080                 break;
1081         case PRID_IMP_R6000:
1082                 c->cputype = CPU_R6000;
1083                 __cpu_name[cpu] = "R6000";
1084                 set_isa(c, MIPS_CPU_ISA_II);
1085                 c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
1086                 c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
1087                              MIPS_CPU_LLSC;
1088                 c->tlbsize = 32;
1089                 break;
1090         case PRID_IMP_R6000A:
1091                 c->cputype = CPU_R6000A;
1092                 __cpu_name[cpu] = "R6000A";
1093                 set_isa(c, MIPS_CPU_ISA_II);
1094                 c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
1095                 c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
1096                              MIPS_CPU_LLSC;
1097                 c->tlbsize = 32;
1098                 break;
1099         case PRID_IMP_RM7000:
1100                 c->cputype = CPU_RM7000;
1101                 __cpu_name[cpu] = "RM7000";
1102                 set_isa(c, MIPS_CPU_ISA_IV);
1103                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1104                              MIPS_CPU_LLSC;
1105                 /*
1106                  * Undocumented RM7000:  Bit 29 in the info register of
1107                  * the RM7000 v2.0 indicates if the TLB has 48 or 64
1108                  * entries.
1109                  *
1110                  * 29      1 =>    64 entry JTLB
1111                  *         0 =>    48 entry JTLB
1112                  */
1113                 c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
1114                 break;
1115         case PRID_IMP_R8000:
1116                 c->cputype = CPU_R8000;
1117                 __cpu_name[cpu] = "RM8000";
1118                 set_isa(c, MIPS_CPU_ISA_IV);
1119                 c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
1120                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
1121                              MIPS_CPU_LLSC;
1122                 c->tlbsize = 384;      /* has weird TLB: 3-way x 128 */
1123                 break;
1124         case PRID_IMP_R10000:
1125                 c->cputype = CPU_R10000;
1126                 __cpu_name[cpu] = "R10000";
1127                 set_isa(c, MIPS_CPU_ISA_IV);
1128                 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
1129                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
1130                              MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
1131                              MIPS_CPU_LLSC;
1132                 c->tlbsize = 64;
1133                 break;
1134         case PRID_IMP_R12000:
1135                 c->cputype = CPU_R12000;
1136                 __cpu_name[cpu] = "R12000";
1137                 set_isa(c, MIPS_CPU_ISA_IV);
1138                 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
1139                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
1140                              MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
1141                              MIPS_CPU_LLSC | MIPS_CPU_BP_GHIST;
1142                 c->tlbsize = 64;
1143                 break;
1144         case PRID_IMP_R14000:
1145                 if (((c->processor_id >> 4) & 0x0f) > 2) {
1146                         c->cputype = CPU_R16000;
1147                         __cpu_name[cpu] = "R16000";
1148                 } else {
1149                         c->cputype = CPU_R14000;
1150                         __cpu_name[cpu] = "R14000";
1151                 }
1152                 set_isa(c, MIPS_CPU_ISA_IV);
1153                 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
1154                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
1155                              MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
1156                              MIPS_CPU_LLSC | MIPS_CPU_BP_GHIST;
1157                 c->tlbsize = 64;
1158                 break;
1159         case PRID_IMP_LOONGSON_64:  /* Loongson-2/3 */
1160                 switch (c->processor_id & PRID_REV_MASK) {
1161                 case PRID_REV_LOONGSON2E:
1162                         c->cputype = CPU_LOONGSON2;
1163                         __cpu_name[cpu] = "ICT Loongson-2";
1164                         set_elf_platform(cpu, "loongson2e");
1165                         set_isa(c, MIPS_CPU_ISA_III);
1166                         c->fpu_msk31 |= FPU_CSR_CONDX;
1167                         break;
1168                 case PRID_REV_LOONGSON2F:
1169                         c->cputype = CPU_LOONGSON2;
1170                         __cpu_name[cpu] = "ICT Loongson-2";
1171                         set_elf_platform(cpu, "loongson2f");
1172                         set_isa(c, MIPS_CPU_ISA_III);
1173                         c->fpu_msk31 |= FPU_CSR_CONDX;
1174                         break;
1175                 case PRID_REV_LOONGSON3A:
1176                         c->cputype = CPU_LOONGSON3;
1177                         __cpu_name[cpu] = "ICT Loongson-3";
1178                         set_elf_platform(cpu, "loongson3a");
1179                         set_isa(c, MIPS_CPU_ISA_M64R1);
1180                         break;
1181                 case PRID_REV_LOONGSON3B_R1:
1182                 case PRID_REV_LOONGSON3B_R2:
1183                         c->cputype = CPU_LOONGSON3;
1184                         __cpu_name[cpu] = "ICT Loongson-3";
1185                         set_elf_platform(cpu, "loongson3b");
1186                         set_isa(c, MIPS_CPU_ISA_M64R1);
1187                         break;
1188                 }
1189
1190                 c->options = R4K_OPTS |
1191                              MIPS_CPU_FPU | MIPS_CPU_LLSC |
1192                              MIPS_CPU_32FPR;
1193                 c->tlbsize = 64;
1194                 c->writecombine = _CACHE_UNCACHED_ACCELERATED;
1195                 break;
1196         case PRID_IMP_LOONGSON_32:  /* Loongson-1 */
1197                 decode_configs(c);
1198
1199                 c->cputype = CPU_LOONGSON1;
1200
1201                 switch (c->processor_id & PRID_REV_MASK) {
1202                 case PRID_REV_LOONGSON1B:
1203                         __cpu_name[cpu] = "Loongson 1B";
1204                         break;
1205                 }
1206
1207                 break;
1208         }
1209 }
1210
1211 static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
1212 {
1213         c->writecombine = _CACHE_UNCACHED_ACCELERATED;
1214         switch (c->processor_id & PRID_IMP_MASK) {
1215         case PRID_IMP_QEMU_GENERIC:
1216                 c->writecombine = _CACHE_UNCACHED;
1217                 c->cputype = CPU_QEMU_GENERIC;
1218                 __cpu_name[cpu] = "MIPS GENERIC QEMU";
1219                 break;
1220         case PRID_IMP_4KC:
1221                 c->cputype = CPU_4KC;
1222                 c->writecombine = _CACHE_UNCACHED;
1223                 __cpu_name[cpu] = "MIPS 4Kc";
1224                 break;
1225         case PRID_IMP_4KEC:
1226         case PRID_IMP_4KECR2:
1227                 c->cputype = CPU_4KEC;
1228                 c->writecombine = _CACHE_UNCACHED;
1229                 __cpu_name[cpu] = "MIPS 4KEc";
1230                 break;
1231         case PRID_IMP_4KSC:
1232         case PRID_IMP_4KSD:
1233                 c->cputype = CPU_4KSC;
1234                 c->writecombine = _CACHE_UNCACHED;
1235                 __cpu_name[cpu] = "MIPS 4KSc";
1236                 break;
1237         case PRID_IMP_5KC:
1238                 c->cputype = CPU_5KC;
1239                 c->writecombine = _CACHE_UNCACHED;
1240                 __cpu_name[cpu] = "MIPS 5Kc";
1241                 break;
1242         case PRID_IMP_5KE:
1243                 c->cputype = CPU_5KE;
1244                 c->writecombine = _CACHE_UNCACHED;
1245                 __cpu_name[cpu] = "MIPS 5KE";
1246                 break;
1247         case PRID_IMP_20KC:
1248                 c->cputype = CPU_20KC;
1249                 c->writecombine = _CACHE_UNCACHED;
1250                 __cpu_name[cpu] = "MIPS 20Kc";
1251                 break;
1252         case PRID_IMP_24K:
1253                 c->cputype = CPU_24K;
1254                 c->writecombine = _CACHE_UNCACHED;
1255                 __cpu_name[cpu] = "MIPS 24Kc";
1256                 break;
1257         case PRID_IMP_24KE:
1258                 c->cputype = CPU_24K;
1259                 c->writecombine = _CACHE_UNCACHED;
1260                 __cpu_name[cpu] = "MIPS 24KEc";
1261                 break;
1262         case PRID_IMP_25KF:
1263                 c->cputype = CPU_25KF;
1264                 c->writecombine = _CACHE_UNCACHED;
1265                 __cpu_name[cpu] = "MIPS 25Kc";
1266                 break;
1267         case PRID_IMP_34K:
1268                 c->cputype = CPU_34K;
1269                 c->writecombine = _CACHE_UNCACHED;
1270                 __cpu_name[cpu] = "MIPS 34Kc";
1271                 break;
1272         case PRID_IMP_74K:
1273                 c->cputype = CPU_74K;
1274                 c->writecombine = _CACHE_UNCACHED;
1275                 __cpu_name[cpu] = "MIPS 74Kc";
1276                 break;
1277         case PRID_IMP_M14KC:
1278                 c->cputype = CPU_M14KC;
1279                 c->writecombine = _CACHE_UNCACHED;
1280                 __cpu_name[cpu] = "MIPS M14Kc";
1281                 break;
1282         case PRID_IMP_M14KEC:
1283                 c->cputype = CPU_M14KEC;
1284                 c->writecombine = _CACHE_UNCACHED;
1285                 __cpu_name[cpu] = "MIPS M14KEc";
1286                 break;
1287         case PRID_IMP_1004K:
1288                 c->cputype = CPU_1004K;
1289                 c->writecombine = _CACHE_UNCACHED;
1290                 __cpu_name[cpu] = "MIPS 1004Kc";
1291                 break;
1292         case PRID_IMP_1074K:
1293                 c->cputype = CPU_1074K;
1294                 c->writecombine = _CACHE_UNCACHED;
1295                 __cpu_name[cpu] = "MIPS 1074Kc";
1296                 break;
1297         case PRID_IMP_INTERAPTIV_UP:
1298                 c->cputype = CPU_INTERAPTIV;
1299                 __cpu_name[cpu] = "MIPS interAptiv";
1300                 break;
1301         case PRID_IMP_INTERAPTIV_MP:
1302                 c->cputype = CPU_INTERAPTIV;
1303                 __cpu_name[cpu] = "MIPS interAptiv (multi)";
1304                 break;
1305         case PRID_IMP_PROAPTIV_UP:
1306                 c->cputype = CPU_PROAPTIV;
1307                 __cpu_name[cpu] = "MIPS proAptiv";
1308                 break;
1309         case PRID_IMP_PROAPTIV_MP:
1310                 c->cputype = CPU_PROAPTIV;
1311                 __cpu_name[cpu] = "MIPS proAptiv (multi)";
1312                 break;
1313         case PRID_IMP_P5600:
1314                 c->cputype = CPU_P5600;
1315                 __cpu_name[cpu] = "MIPS P5600";
1316                 break;
1317         case PRID_IMP_I6400:
1318                 c->cputype = CPU_I6400;
1319                 __cpu_name[cpu] = "MIPS I6400";
1320                 break;
1321         case PRID_IMP_M5150:
1322                 c->cputype = CPU_M5150;
1323                 __cpu_name[cpu] = "MIPS M5150";
1324                 break;
1325         }
1326
1327         decode_configs(c);
1328
1329         spram_config();
1330 }
1331
1332 static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
1333 {
1334         decode_configs(c);
1335         switch (c->processor_id & PRID_IMP_MASK) {
1336         case PRID_IMP_AU1_REV1:
1337         case PRID_IMP_AU1_REV2:
1338                 c->cputype = CPU_ALCHEMY;
1339                 switch ((c->processor_id >> 24) & 0xff) {
1340                 case 0:
1341                         __cpu_name[cpu] = "Au1000";
1342                         break;
1343                 case 1:
1344                         __cpu_name[cpu] = "Au1500";
1345                         break;
1346                 case 2:
1347                         __cpu_name[cpu] = "Au1100";
1348                         break;
1349                 case 3:
1350                         __cpu_name[cpu] = "Au1550";
1351                         break;
1352                 case 4:
1353                         __cpu_name[cpu] = "Au1200";
1354                         if ((c->processor_id & PRID_REV_MASK) == 2)
1355                                 __cpu_name[cpu] = "Au1250";
1356                         break;
1357                 case 5:
1358                         __cpu_name[cpu] = "Au1210";
1359                         break;
1360                 default:
1361                         __cpu_name[cpu] = "Au1xxx";
1362                         break;
1363                 }
1364                 break;
1365         }
1366 }
1367
1368 static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu)
1369 {
1370         decode_configs(c);
1371
1372         c->writecombine = _CACHE_UNCACHED_ACCELERATED;
1373         switch (c->processor_id & PRID_IMP_MASK) {
1374         case PRID_IMP_SB1:
1375                 c->cputype = CPU_SB1;
1376                 __cpu_name[cpu] = "SiByte SB1";
1377                 /* FPU in pass1 is known to have issues. */
1378                 if ((c->processor_id & PRID_REV_MASK) < 0x02)
1379                         c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR);
1380                 break;
1381         case PRID_IMP_SB1A:
1382                 c->cputype = CPU_SB1A;
1383                 __cpu_name[cpu] = "SiByte SB1A";
1384                 break;
1385         }
1386 }
1387
1388 static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu)
1389 {
1390         decode_configs(c);
1391         switch (c->processor_id & PRID_IMP_MASK) {
1392         case PRID_IMP_SR71000:
1393                 c->cputype = CPU_SR71000;
1394                 __cpu_name[cpu] = "Sandcraft SR71000";
1395                 c->scache.ways = 8;
1396                 c->tlbsize = 64;
1397                 break;
1398         }
1399 }
1400
1401 static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu)
1402 {
1403         decode_configs(c);
1404         switch (c->processor_id & PRID_IMP_MASK) {
1405         case PRID_IMP_PR4450:
1406                 c->cputype = CPU_PR4450;
1407                 __cpu_name[cpu] = "Philips PR4450";
1408                 set_isa(c, MIPS_CPU_ISA_M32R1);
1409                 break;
1410         }
1411 }
1412
1413 static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
1414 {
1415         decode_configs(c);
1416         switch (c->processor_id & PRID_IMP_MASK) {
1417         case PRID_IMP_BMIPS32_REV4:
1418         case PRID_IMP_BMIPS32_REV8:
1419                 c->cputype = CPU_BMIPS32;
1420                 __cpu_name[cpu] = "Broadcom BMIPS32";
1421                 set_elf_platform(cpu, "bmips32");
1422                 break;
1423         case PRID_IMP_BMIPS3300:
1424         case PRID_IMP_BMIPS3300_ALT:
1425         case PRID_IMP_BMIPS3300_BUG:
1426                 c->cputype = CPU_BMIPS3300;
1427                 __cpu_name[cpu] = "Broadcom BMIPS3300";
1428                 set_elf_platform(cpu, "bmips3300");
1429                 break;
1430         case PRID_IMP_BMIPS43XX: {
1431                 int rev = c->processor_id & PRID_REV_MASK;
1432
1433                 if (rev >= PRID_REV_BMIPS4380_LO &&
1434                                 rev <= PRID_REV_BMIPS4380_HI) {
1435                         c->cputype = CPU_BMIPS4380;
1436                         __cpu_name[cpu] = "Broadcom BMIPS4380";
1437                         set_elf_platform(cpu, "bmips4380");
1438                 } else {
1439                         c->cputype = CPU_BMIPS4350;
1440                         __cpu_name[cpu] = "Broadcom BMIPS4350";
1441                         set_elf_platform(cpu, "bmips4350");
1442                 }
1443                 break;
1444         }
1445         case PRID_IMP_BMIPS5000:
1446         case PRID_IMP_BMIPS5200:
1447                 c->cputype = CPU_BMIPS5000;
1448                 __cpu_name[cpu] = "Broadcom BMIPS5000";
1449                 set_elf_platform(cpu, "bmips5000");
1450                 c->options |= MIPS_CPU_ULRI;
1451                 break;
1452         }
1453 }
1454
1455 static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
1456 {
1457         decode_configs(c);
1458         switch (c->processor_id & PRID_IMP_MASK) {
1459         case PRID_IMP_CAVIUM_CN38XX:
1460         case PRID_IMP_CAVIUM_CN31XX:
1461         case PRID_IMP_CAVIUM_CN30XX:
1462                 c->cputype = CPU_CAVIUM_OCTEON;
1463                 __cpu_name[cpu] = "Cavium Octeon";
1464                 goto platform;
1465         case PRID_IMP_CAVIUM_CN58XX:
1466         case PRID_IMP_CAVIUM_CN56XX:
1467         case PRID_IMP_CAVIUM_CN50XX:
1468         case PRID_IMP_CAVIUM_CN52XX:
1469                 c->cputype = CPU_CAVIUM_OCTEON_PLUS;
1470                 __cpu_name[cpu] = "Cavium Octeon+";
1471 platform:
1472                 set_elf_platform(cpu, "octeon");
1473                 break;
1474         case PRID_IMP_CAVIUM_CN61XX:
1475         case PRID_IMP_CAVIUM_CN63XX:
1476         case PRID_IMP_CAVIUM_CN66XX:
1477         case PRID_IMP_CAVIUM_CN68XX:
1478         case PRID_IMP_CAVIUM_CNF71XX:
1479                 c->cputype = CPU_CAVIUM_OCTEON2;
1480                 __cpu_name[cpu] = "Cavium Octeon II";
1481                 set_elf_platform(cpu, "octeon2");
1482                 break;
1483         case PRID_IMP_CAVIUM_CN70XX:
1484         case PRID_IMP_CAVIUM_CN73XX:
1485         case PRID_IMP_CAVIUM_CNF75XX:
1486         case PRID_IMP_CAVIUM_CN78XX:
1487                 c->cputype = CPU_CAVIUM_OCTEON3;
1488                 __cpu_name[cpu] = "Cavium Octeon III";
1489                 set_elf_platform(cpu, "octeon3");
1490                 break;
1491         default:
1492                 printk(KERN_INFO "Unknown Octeon chip!\n");
1493                 c->cputype = CPU_UNKNOWN;
1494                 break;
1495         }
1496 }
1497
1498 static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu)
1499 {
1500         decode_configs(c);
1501         /* JZRISC does not implement the CP0 counter. */
1502         c->options &= ~MIPS_CPU_COUNTER;
1503         BUG_ON(!__builtin_constant_p(cpu_has_counter) || cpu_has_counter);
1504         switch (c->processor_id & PRID_IMP_MASK) {
1505         case PRID_IMP_JZRISC:
1506                 c->cputype = CPU_JZRISC;
1507                 c->writecombine = _CACHE_UNCACHED_ACCELERATED;
1508                 __cpu_name[cpu] = "Ingenic JZRISC";
1509                 break;
1510         default:
1511                 panic("Unknown Ingenic Processor ID!");
1512                 break;
1513         }
1514 }
1515
1516 static inline void cpu_probe_netlogic(struct cpuinfo_mips *c, int cpu)
1517 {
1518         decode_configs(c);
1519
1520         if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_NETLOGIC_AU13XX) {
1521                 c->cputype = CPU_ALCHEMY;
1522                 __cpu_name[cpu] = "Au1300";
1523                 /* following stuff is not for Alchemy */
1524                 return;
1525         }
1526
1527         c->options = (MIPS_CPU_TLB       |
1528                         MIPS_CPU_4KEX    |
1529                         MIPS_CPU_COUNTER |
1530                         MIPS_CPU_DIVEC   |
1531                         MIPS_CPU_WATCH   |
1532                         MIPS_CPU_EJTAG   |
1533                         MIPS_CPU_LLSC);
1534
1535         switch (c->processor_id & PRID_IMP_MASK) {
1536         case PRID_IMP_NETLOGIC_XLP2XX:
1537         case PRID_IMP_NETLOGIC_XLP9XX:
1538         case PRID_IMP_NETLOGIC_XLP5XX:
1539                 c->cputype = CPU_XLP;
1540                 __cpu_name[cpu] = "Broadcom XLPII";
1541                 break;
1542
1543         case PRID_IMP_NETLOGIC_XLP8XX:
1544         case PRID_IMP_NETLOGIC_XLP3XX:
1545                 c->cputype = CPU_XLP;
1546                 __cpu_name[cpu] = "Netlogic XLP";
1547                 break;
1548
1549         case PRID_IMP_NETLOGIC_XLR732:
1550         case PRID_IMP_NETLOGIC_XLR716:
1551         case PRID_IMP_NETLOGIC_XLR532:
1552         case PRID_IMP_NETLOGIC_XLR308:
1553         case PRID_IMP_NETLOGIC_XLR532C:
1554         case PRID_IMP_NETLOGIC_XLR516C:
1555         case PRID_IMP_NETLOGIC_XLR508C:
1556         case PRID_IMP_NETLOGIC_XLR308C:
1557                 c->cputype = CPU_XLR;
1558                 __cpu_name[cpu] = "Netlogic XLR";
1559                 break;
1560
1561         case PRID_IMP_NETLOGIC_XLS608:
1562         case PRID_IMP_NETLOGIC_XLS408:
1563         case PRID_IMP_NETLOGIC_XLS404:
1564         case PRID_IMP_NETLOGIC_XLS208:
1565         case PRID_IMP_NETLOGIC_XLS204:
1566         case PRID_IMP_NETLOGIC_XLS108:
1567         case PRID_IMP_NETLOGIC_XLS104:
1568         case PRID_IMP_NETLOGIC_XLS616B:
1569         case PRID_IMP_NETLOGIC_XLS608B:
1570         case PRID_IMP_NETLOGIC_XLS416B:
1571         case PRID_IMP_NETLOGIC_XLS412B:
1572         case PRID_IMP_NETLOGIC_XLS408B:
1573         case PRID_IMP_NETLOGIC_XLS404B:
1574                 c->cputype = CPU_XLR;
1575                 __cpu_name[cpu] = "Netlogic XLS";
1576                 break;
1577
1578         default:
1579                 pr_info("Unknown Netlogic chip id [%02x]!\n",
1580                        c->processor_id);
1581                 c->cputype = CPU_XLR;
1582                 break;
1583         }
1584
1585         if (c->cputype == CPU_XLP) {
1586                 set_isa(c, MIPS_CPU_ISA_M64R2);
1587                 c->options |= (MIPS_CPU_FPU | MIPS_CPU_ULRI | MIPS_CPU_MCHECK);
1588                 /* This will be updated again after all threads are woken up */
1589                 c->tlbsize = ((read_c0_config6() >> 16) & 0xffff) + 1;
1590         } else {
1591                 set_isa(c, MIPS_CPU_ISA_M64R1);
1592                 c->tlbsize = ((read_c0_config1() >> 25) & 0x3f) + 1;
1593         }
1594         c->kscratch_mask = 0xf;
1595 }
1596
1597 #ifdef CONFIG_64BIT
1598 /* For use by uaccess.h */
1599 u64 __ua_limit;
1600 EXPORT_SYMBOL(__ua_limit);
1601 #endif
1602
1603 const char *__cpu_name[NR_CPUS];
1604 const char *__elf_platform;
1605
1606 void cpu_probe(void)
1607 {
1608         struct cpuinfo_mips *c = &current_cpu_data;
1609         unsigned int cpu = smp_processor_id();
1610
1611         c->processor_id = PRID_IMP_UNKNOWN;
1612         c->fpu_id       = FPIR_IMP_NONE;
1613         c->cputype      = CPU_UNKNOWN;
1614         c->writecombine = _CACHE_UNCACHED;
1615
1616         c->fpu_csr31    = FPU_CSR_RN;
1617         c->fpu_msk31    = FPU_CSR_RSVD | FPU_CSR_ABS2008 | FPU_CSR_NAN2008;
1618
1619         c->processor_id = read_c0_prid();
1620         switch (c->processor_id & PRID_COMP_MASK) {
1621         case PRID_COMP_LEGACY:
1622                 cpu_probe_legacy(c, cpu);
1623                 break;
1624         case PRID_COMP_MIPS:
1625                 cpu_probe_mips(c, cpu);
1626                 break;
1627         case PRID_COMP_ALCHEMY:
1628                 cpu_probe_alchemy(c, cpu);
1629                 break;
1630         case PRID_COMP_SIBYTE:
1631                 cpu_probe_sibyte(c, cpu);
1632                 break;
1633         case PRID_COMP_BROADCOM:
1634                 cpu_probe_broadcom(c, cpu);
1635                 break;
1636         case PRID_COMP_SANDCRAFT:
1637                 cpu_probe_sandcraft(c, cpu);
1638                 break;
1639         case PRID_COMP_NXP:
1640                 cpu_probe_nxp(c, cpu);
1641                 break;
1642         case PRID_COMP_CAVIUM:
1643                 cpu_probe_cavium(c, cpu);
1644                 break;
1645         case PRID_COMP_INGENIC_D0:
1646         case PRID_COMP_INGENIC_D1:
1647         case PRID_COMP_INGENIC_E1:
1648                 cpu_probe_ingenic(c, cpu);
1649                 break;
1650         case PRID_COMP_NETLOGIC:
1651                 cpu_probe_netlogic(c, cpu);
1652                 break;
1653         }
1654
1655         BUG_ON(!__cpu_name[cpu]);
1656         BUG_ON(c->cputype == CPU_UNKNOWN);
1657
1658         /*
1659          * Platform code can force the cpu type to optimize code
1660          * generation. In that case be sure the cpu type is correctly
1661          * manually setup otherwise it could trigger some nasty bugs.
1662          */
1663         BUG_ON(current_cpu_type() != c->cputype);
1664
1665         if (mips_fpu_disabled)
1666                 c->options &= ~MIPS_CPU_FPU;
1667
1668         if (mips_dsp_disabled)
1669                 c->ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P);
1670
1671         if (mips_htw_disabled) {
1672                 c->options &= ~MIPS_CPU_HTW;
1673                 write_c0_pwctl(read_c0_pwctl() &
1674                                ~(1 << MIPS_PWCTL_PWEN_SHIFT));
1675         }
1676
1677         if (c->options & MIPS_CPU_FPU)
1678                 cpu_set_fpu_opts(c);
1679         else
1680                 cpu_set_nofpu_opts(c);
1681
1682         if (cpu_has_bp_ghist)
1683                 write_c0_r10k_diag(read_c0_r10k_diag() |
1684                                    R10K_DIAG_E_GHIST);
1685
1686         if (cpu_has_mips_r2_r6) {
1687                 c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
1688                 /* R2 has Performance Counter Interrupt indicator */
1689                 c->options |= MIPS_CPU_PCI;
1690         }
1691         else
1692                 c->srsets = 1;
1693
1694         if (cpu_has_mips_r6)
1695                 elf_hwcap |= HWCAP_MIPS_R6;
1696
1697         if (cpu_has_msa) {
1698                 c->msa_id = cpu_get_msa_id();
1699                 WARN(c->msa_id & MSA_IR_WRPF,
1700                      "Vector register partitioning unimplemented!");
1701                 elf_hwcap |= HWCAP_MIPS_MSA;
1702         }
1703
1704         cpu_probe_vmbits(c);
1705
1706 #ifdef CONFIG_64BIT
1707         if (cpu == 0)
1708                 __ua_limit = ~((1ull << cpu_vmbits) - 1);
1709 #endif
1710 }
1711
1712 void cpu_report(void)
1713 {
1714         struct cpuinfo_mips *c = &current_cpu_data;
1715
1716         pr_info("CPU%d revision is: %08x (%s)\n",
1717                 smp_processor_id(), c->processor_id, cpu_name_string());
1718         if (c->options & MIPS_CPU_FPU)
1719                 printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id);
1720         if (cpu_has_msa)
1721                 pr_info("MSA revision is: %08x\n", c->msa_id);
1722 }