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         case CPU_P6600:
 543                 /* proAptiv & related cores use Config6 to enable the FTLB */
 544                 config = read_c0_config6();
 545                 /* Clear the old probability value */
 546                 config &= ~(3 << MIPS_CONF6_FTLBP_SHIFT);
 547                 if (enable)
 548                         /* Enable FTLB */
 549                         write_c0_config6(config |
 550                                          (calculate_ftlb_probability(c)
 551                                           << MIPS_CONF6_FTLBP_SHIFT)
 552                                          | MIPS_CONF6_FTLBEN);
 553                 else
 554                         /* Disable FTLB */
 555                         write_c0_config6(config &  ~MIPS_CONF6_FTLBEN);
 556                 break;
 557         case CPU_I6400:
 558                 /* I6400 & related cores use Config7 to configure FTLB */
 559                 config = read_c0_config7();
 560                 /* Clear the old probability value */
 561                 config &= ~(3 << MIPS_CONF7_FTLBP_SHIFT);
 562                 write_c0_config7(config | (calculate_ftlb_probability(c)
 563                                            << MIPS_CONF7_FTLBP_SHIFT));
 564                 break;
 565         case CPU_LOONGSON3:
 566                 /* Flush ITLB, DTLB, VTLB and FTLB */
 567                 write_c0_diag(LOONGSON_DIAG_ITLB | LOONGSON_DIAG_DTLB |
 568                               LOONGSON_DIAG_VTLB | LOONGSON_DIAG_FTLB);
 569                 /* Loongson-3 cores use Config6 to enable the FTLB */
 570                 config = read_c0_config6();
 571                 if (enable)
 572                         /* Enable FTLB */
 573                         write_c0_config6(config & ~MIPS_CONF6_FTLBDIS);
 574                 else
 575                         /* Disable FTLB */
 576                         write_c0_config6(config | MIPS_CONF6_FTLBDIS);
 577                 break;
 578         default:
 579                 return 1;
 580         }
 581
 582         return 0;
 583 }
 584
 585 static inline unsigned int decode_config0(struct cpuinfo_mips *c)
 586 {
 587         unsigned int config0;
 588         int isa, mt;
 589
 590         config0 = read_c0_config();
 591
 592         /*
 593          * Look for Standard TLB or Dual VTLB and FTLB
 594          */
 595         mt = config0 & MIPS_CONF_MT;
 596         if (mt == MIPS_CONF_MT_TLB)
 597                 c->options |= MIPS_CPU_TLB;
 598         else if (mt == MIPS_CONF_MT_FTLB)
 599                 c->options |= MIPS_CPU_TLB | MIPS_CPU_FTLB;
 600
 601         isa = (config0 & MIPS_CONF_AT) >> 13;
 602         switch (isa) {
 603         case 0:
 604                 switch ((config0 & MIPS_CONF_AR) >> 10) {
 605                 case 0:
 606                         set_isa(c, MIPS_CPU_ISA_M32R1);
 607                         break;
 608                 case 1:
 609                         set_isa(c, MIPS_CPU_ISA_M32R2);
 610                         break;
 611                 case 2:
 612                         set_isa(c, MIPS_CPU_ISA_M32R6);
 613                         break;
 614                 default:
 615                         goto unknown;
 616                 }
 617                 break;
 618         case 2:
 619                 switch ((config0 & MIPS_CONF_AR) >> 10) {
 620                 case 0:
 621                         set_isa(c, MIPS_CPU_ISA_M64R1);
 622                         break;
 623                 case 1:
 624                         set_isa(c, MIPS_CPU_ISA_M64R2);
 625                         break;
 626                 case 2:
 627                         set_isa(c, MIPS_CPU_ISA_M64R6);
 628                         break;
 629                 default:
 630                         goto unknown;
 631                 }
 632                 break;
 633         default:
 634                 goto unknown;
 635         }
 636
 637         return config0 & MIPS_CONF_M;
 638
 639 unknown:
 640         panic(unknown_isa, config0);
 641 }
 642
 643 static inline unsigned int decode_config1(struct cpuinfo_mips *c)
 644 {
 645         unsigned int config1;
 646
 647         config1 = read_c0_config1();
 648
 649         if (config1 & MIPS_CONF1_MD)
 650                 c->ases |= MIPS_ASE_MDMX;
 651         if (config1 & MIPS_CONF1_PC)
 652                 c->options |= MIPS_CPU_PERF;
 653         if (config1 & MIPS_CONF1_WR)
 654                 c->options |= MIPS_CPU_WATCH;
 655         if (config1 & MIPS_CONF1_CA)
 656                 c->ases |= MIPS_ASE_MIPS16;
 657         if (config1 & MIPS_CONF1_EP)
 658                 c->options |= MIPS_CPU_EJTAG;
 659         if (config1 & MIPS_CONF1_FP) {
 660                 c->options |= MIPS_CPU_FPU;
 661                 c->options |= MIPS_CPU_32FPR;
 662         }
 663         if (cpu_has_tlb) {
 664                 c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1;
 665                 c->tlbsizevtlb = c->tlbsize;
 666                 c->tlbsizeftlbsets = 0;
 667         }
 668
 669         return config1 & MIPS_CONF_M;
 670 }
 671
 672 static inline unsigned int decode_config2(struct cpuinfo_mips *c)
 673 {
 674         unsigned int config2;
 675
 676         config2 = read_c0_config2();
 677
 678         if (config2 & MIPS_CONF2_SL)
 679                 c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
 680
 681         return config2 & MIPS_CONF_M;
 682 }
 683
 684 static inline unsigned int decode_config3(struct cpuinfo_mips *c)
 685 {
 686         unsigned int config3;
 687
 688         config3 = read_c0_config3();
 689
 690         if (config3 & MIPS_CONF3_SM) {
 691                 c->ases |= MIPS_ASE_SMARTMIPS;
 692                 c->options |= MIPS_CPU_RIXI | MIPS_CPU_CTXTC;
 693         }
 694         if (config3 & MIPS_CONF3_RXI)
 695                 c->options |= MIPS_CPU_RIXI;
 696         if (config3 & MIPS_CONF3_CTXTC)
 697                 c->options |= MIPS_CPU_CTXTC;
 698         if (config3 & MIPS_CONF3_DSP)
 699                 c->ases |= MIPS_ASE_DSP;
 700         if (config3 & MIPS_CONF3_DSP2P) {
 701                 c->ases |= MIPS_ASE_DSP2P;
 702                 if (cpu_has_mips_r6)
 703                         c->ases |= MIPS_ASE_DSP3;
 704         }
 705         if (config3 & MIPS_CONF3_VINT)
 706                 c->options |= MIPS_CPU_VINT;
 707         if (config3 & MIPS_CONF3_VEIC)
 708                 c->options |= MIPS_CPU_VEIC;
 709         if (config3 & MIPS_CONF3_LPA)
 710                 c->options |= MIPS_CPU_LPA;
 711         if (config3 & MIPS_CONF3_MT)
 712                 c->ases |= MIPS_ASE_MIPSMT;
 713         if (config3 & MIPS_CONF3_ULRI)
 714                 c->options |= MIPS_CPU_ULRI;
 715         if (config3 & MIPS_CONF3_ISA)
 716                 c->options |= MIPS_CPU_MICROMIPS;
 717         if (config3 & MIPS_CONF3_VZ)
 718                 c->ases |= MIPS_ASE_VZ;
 719         if (config3 & MIPS_CONF3_SC)
 720                 c->options |= MIPS_CPU_SEGMENTS;
 721         if (config3 & MIPS_CONF3_BI)
 722                 c->options |= MIPS_CPU_BADINSTR;
 723         if (config3 & MIPS_CONF3_BP)
 724                 c->options |= MIPS_CPU_BADINSTRP;
 725         if (config3 & MIPS_CONF3_MSA)
 726                 c->ases |= MIPS_ASE_MSA;
 727         if (config3 & MIPS_CONF3_PW) {
 728                 c->htw_seq = 0;
 729                 c->options |= MIPS_CPU_HTW;
 730         }
 731         if (config3 & MIPS_CONF3_CDMM)
 732                 c->options |= MIPS_CPU_CDMM;
 733         if (config3 & MIPS_CONF3_SP)
 734                 c->options |= MIPS_CPU_SP;
 735
 736         return config3 & MIPS_CONF_M;
 737 }
 738
 739 static inline unsigned int decode_config4(struct cpuinfo_mips *c)
 740 {
 741         unsigned int config4;
 742         unsigned int newcf4;
 743         unsigned int mmuextdef;
 744         unsigned int ftlb_page = MIPS_CONF4_FTLBPAGESIZE;
 745         unsigned long asid_mask;
 746
 747         config4 = read_c0_config4();
 748
 749         if (cpu_has_tlb) {
 750                 if (((config4 & MIPS_CONF4_IE) >> 29) == 2)
 751                         c->options |= MIPS_CPU_TLBINV;
 752
 753                 /*
 754                  * R6 has dropped the MMUExtDef field from config4.
 755                  * On R6 the fields always describe the FTLB, and only if it is
 756                  * present according to Config.MT.
 757                  */
 758                 if (!cpu_has_mips_r6)
 759                         mmuextdef = config4 & MIPS_CONF4_MMUEXTDEF;
 760                 else if (cpu_has_ftlb)
 761                         mmuextdef = MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT;
 762                 else
 763                         mmuextdef = 0;
 764
 765                 switch (mmuextdef) {
 766                 case MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT:
 767                         c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40;
 768                         c->tlbsizevtlb = c->tlbsize;
 769                         break;
 770                 case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
 771                         c->tlbsizevtlb +=
 772                                 ((config4 & MIPS_CONF4_VTLBSIZEEXT) >>
 773                                   MIPS_CONF4_VTLBSIZEEXT_SHIFT) * 0x40;
 774                         c->tlbsize = c->tlbsizevtlb;
 775                         ftlb_page = MIPS_CONF4_VFTLBPAGESIZE;
 776                         /* fall through */
 777                 case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
 778                         if (mips_ftlb_disabled)
 779                                 break;
 780                         newcf4 = (config4 & ~ftlb_page) |
 781                                 (page_size_ftlb(mmuextdef) <<
 782                                  MIPS_CONF4_FTLBPAGESIZE_SHIFT);
 783                         write_c0_config4(newcf4);
 784                         back_to_back_c0_hazard();
 785                         config4 = read_c0_config4();
 786                         if (config4 != newcf4) {
 787                                 pr_err("PAGE_SIZE 0x%lx is not supported by FTLB (config4=0x%x)\n",
 788                                        PAGE_SIZE, config4);
 789                                 /* Switch FTLB off */
 790                                 set_ftlb_enable(c, 0);
 791                                 break;
 792                         }
 793                         c->tlbsizeftlbsets = 1 <<
 794                                 ((config4 & MIPS_CONF4_FTLBSETS) >>
 795                                  MIPS_CONF4_FTLBSETS_SHIFT);
 796                         c->tlbsizeftlbways = ((config4 & MIPS_CONF4_FTLBWAYS) >>
 797                                               MIPS_CONF4_FTLBWAYS_SHIFT) + 2;
 798                         c->tlbsize += c->tlbsizeftlbways * c->tlbsizeftlbsets;
 799                         mips_has_ftlb_configured = 1;
 800                         break;
 801                 }
 802         }
 803
 804         c->kscratch_mask = (config4 & MIPS_CONF4_KSCREXIST)
 805                                 >> MIPS_CONF4_KSCREXIST_SHIFT;
 806
 807         asid_mask = MIPS_ENTRYHI_ASID;
 808         if (config4 & MIPS_CONF4_AE)
 809                 asid_mask |= MIPS_ENTRYHI_ASIDX;
 810         set_cpu_asid_mask(c, asid_mask);
 811
 812         /*
 813          * Warn if the computed ASID mask doesn't match the mask the kernel
 814          * is built for. This may indicate either a serious problem or an
 815          * easy optimisation opportunity, but either way should be addressed.
 816          */
 817         WARN_ON(asid_mask != cpu_asid_mask(c));
 818
 819         return config4 & MIPS_CONF_M;
 820 }
 821
 822 static inline unsigned int decode_config5(struct cpuinfo_mips *c)
 823 {
 824         unsigned int config5;
 825
 826         config5 = read_c0_config5();
 827         config5 &= ~(MIPS_CONF5_UFR | MIPS_CONF5_UFE);
 828         write_c0_config5(config5);
 829
 830         if (config5 & MIPS_CONF5_EVA)
 831                 c->options |= MIPS_CPU_EVA;
 832         if (config5 & MIPS_CONF5_MRP)
 833                 c->options |= MIPS_CPU_MAAR;
 834         if (config5 & MIPS_CONF5_LLB)
 835                 c->options |= MIPS_CPU_RW_LLB;
 836         if (config5 & MIPS_CONF5_MVH)
 837                 c->options |= MIPS_CPU_MVH;
 838         if (cpu_has_mips_r6 && (config5 & MIPS_CONF5_VP))
 839                 c->options |= MIPS_CPU_VP;
 840
 841         return config5 & MIPS_CONF_M;
 842 }
 843
 844 static void decode_configs(struct cpuinfo_mips *c)
 845 {
 846         int ok;
 847
 848         /* MIPS32 or MIPS64 compliant CPU.  */
 849         c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER |
 850                      MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK;
 851
 852         c->scache.flags = MIPS_CACHE_NOT_PRESENT;
 853
 854         /* Enable FTLB if present and not disabled */
 855         set_ftlb_enable(c, !mips_ftlb_disabled);
 856
 857         ok = decode_config0(c);                 /* Read Config registers.  */
 858         BUG_ON(!ok);                            /* Arch spec violation!  */
 859         if (ok)
 860                 ok = decode_config1(c);
 861         if (ok)
 862                 ok = decode_config2(c);
 863         if (ok)
 864                 ok = decode_config3(c);
 865         if (ok)
 866                 ok = decode_config4(c);
 867         if (ok)
 868                 ok = decode_config5(c);
 869
 870         /* Probe the EBase.WG bit */
 871         if (cpu_has_mips_r2_r6) {
 872                 u64 ebase;
 873                 unsigned int status;
 874
 875                 /* {read,write}_c0_ebase_64() may be UNDEFINED prior to r6 */
 876                 ebase = cpu_has_mips64r6 ? read_c0_ebase_64()
 877                                          : (s32)read_c0_ebase();
 878                 if (ebase & MIPS_EBASE_WG) {
 879                         /* WG bit already set, we can avoid the clumsy probe */
 880                         c->options |= MIPS_CPU_EBASE_WG;
 881                 } else {
 882                         /* Its UNDEFINED to change EBase while BEV=0 */
 883                         status = read_c0_status();
 884                         write_c0_status(status | ST0_BEV);
 885                         irq_enable_hazard();
 886                         /*
 887                          * On pre-r6 cores, this may well clobber the upper bits
 888                          * of EBase. This is hard to avoid without potentially
 889                          * hitting UNDEFINED dm*c0 behaviour if EBase is 32-bit.
 890                          */
 891                         if (cpu_has_mips64r6)
 892                                 write_c0_ebase_64(ebase | MIPS_EBASE_WG);
 893                         else
 894                                 write_c0_ebase(ebase | MIPS_EBASE_WG);
 895                         back_to_back_c0_hazard();
 896                         /* Restore BEV */
 897                         write_c0_status(status);
 898                         if (read_c0_ebase() & MIPS_EBASE_WG) {
 899                                 c->options |= MIPS_CPU_EBASE_WG;
 900                                 write_c0_ebase(ebase);
 901                         }
 902                 }
 903         }
 904
 905         mips_probe_watch_registers(c);
 906
 907 #ifndef CONFIG_MIPS_CPS
 908         if (cpu_has_mips_r2_r6) {
 909                 c->core = get_ebase_cpunum();
 910                 if (cpu_has_mipsmt)
 911                         c->core >>= fls(core_nvpes()) - 1;
 912         }
 913 #endif
 914 }
 915
 916 /*
 917  * Probe for certain guest capabilities by writing config bits and reading back.
 918  * Finally write back the original value.
 919  */
 920 #define probe_gc0_config(name, maxconf, bits)                           \
 921 do {                                                                    \
 922         unsigned int tmp;                                               \
 923         tmp = read_gc0_##name();                                        \
 924         write_gc0_##name(tmp | (bits));                                 \
 925         back_to_back_c0_hazard();                                       \
 926         maxconf = read_gc0_##name();                                    \
 927         write_gc0_##name(tmp);                                          \
 928 } while (0)
 929
 930 /*
 931  * Probe for dynamic guest capabilities by changing certain config bits and
 932  * reading back to see if they change. Finally write back the original value.
 933  */
 934 #define probe_gc0_config_dyn(name, maxconf, dynconf, bits)              \
 935 do {                                                                    \
 936         maxconf = read_gc0_##name();                                    \
 937         write_gc0_##name(maxconf ^ (bits));                             \
 938         back_to_back_c0_hazard();                                       \
 939         dynconf = maxconf ^ read_gc0_##name();                          \
 940         write_gc0_##name(maxconf);                                      \
 941         maxconf |= dynconf;                                             \
 942 } while (0)
 943
 944 static inline unsigned int decode_guest_config0(struct cpuinfo_mips *c)
 945 {
 946         unsigned int config0;
 947
 948         probe_gc0_config(config, config0, MIPS_CONF_M);
 949
 950         if (config0 & MIPS_CONF_M)
 951                 c->guest.conf |= BIT(1);
 952         return config0 & MIPS_CONF_M;
 953 }
 954
 955 static inline unsigned int decode_guest_config1(struct cpuinfo_mips *c)
 956 {
 957         unsigned int config1, config1_dyn;
 958
 959         probe_gc0_config_dyn(config1, config1, config1_dyn,
 960                              MIPS_CONF_M | MIPS_CONF1_PC | MIPS_CONF1_WR |
 961                              MIPS_CONF1_FP);
 962
 963         if (config1 & MIPS_CONF1_FP)
 964                 c->guest.options |= MIPS_CPU_FPU;
 965         if (config1_dyn & MIPS_CONF1_FP)
 966                 c->guest.options_dyn |= MIPS_CPU_FPU;
 967
 968         if (config1 & MIPS_CONF1_WR)
 969                 c->guest.options |= MIPS_CPU_WATCH;
 970         if (config1_dyn & MIPS_CONF1_WR)
 971                 c->guest.options_dyn |= MIPS_CPU_WATCH;
 972
 973         if (config1 & MIPS_CONF1_PC)
 974                 c->guest.options |= MIPS_CPU_PERF;
 975         if (config1_dyn & MIPS_CONF1_PC)
 976                 c->guest.options_dyn |= MIPS_CPU_PERF;
 977
 978         if (config1 & MIPS_CONF_M)
 979                 c->guest.conf |= BIT(2);
 980         return config1 & MIPS_CONF_M;
 981 }
 982
 983 static inline unsigned int decode_guest_config2(struct cpuinfo_mips *c)
 984 {
 985         unsigned int config2;
 986
 987         probe_gc0_config(config2, config2, MIPS_CONF_M);
 988
 989         if (config2 & MIPS_CONF_M)
 990                 c->guest.conf |= BIT(3);
 991         return config2 & MIPS_CONF_M;
 992 }
 993
 994 static inline unsigned int decode_guest_config3(struct cpuinfo_mips *c)
 995 {
 996         unsigned int config3, config3_dyn;
 997
 998         probe_gc0_config_dyn(config3, config3, config3_dyn,
 999                              MIPS_CONF_M | MIPS_CONF3_MSA | MIPS_CONF3_CTXTC);
1000
1001         if (config3 & MIPS_CONF3_CTXTC)
1002                 c->guest.options |= MIPS_CPU_CTXTC;
1003         if (config3_dyn & MIPS_CONF3_CTXTC)
1004                 c->guest.options_dyn |= MIPS_CPU_CTXTC;
1005
1006         if (config3 & MIPS_CONF3_PW)
1007                 c->guest.options |= MIPS_CPU_HTW;
1008
1009         if (config3 & MIPS_CONF3_SC)
1010                 c->guest.options |= MIPS_CPU_SEGMENTS;
1011
1012         if (config3 & MIPS_CONF3_BI)
1013                 c->guest.options |= MIPS_CPU_BADINSTR;
1014         if (config3 & MIPS_CONF3_BP)
1015                 c->guest.options |= MIPS_CPU_BADINSTRP;
1016
1017         if (config3 & MIPS_CONF3_MSA)
1018                 c->guest.ases |= MIPS_ASE_MSA;
1019         if (config3_dyn & MIPS_CONF3_MSA)
1020                 c->guest.ases_dyn |= MIPS_ASE_MSA;
1021
1022         if (config3 & MIPS_CONF_M)
1023                 c->guest.conf |= BIT(4);
1024         return config3 & MIPS_CONF_M;
1025 }
1026
1027 static inline unsigned int decode_guest_config4(struct cpuinfo_mips *c)
1028 {
1029         unsigned int config4;
1030
1031         probe_gc0_config(config4, config4,
1032                          MIPS_CONF_M | MIPS_CONF4_KSCREXIST);
1033
1034         c->guest.kscratch_mask = (config4 & MIPS_CONF4_KSCREXIST)
1035                                 >> MIPS_CONF4_KSCREXIST_SHIFT;
1036
1037         if (config4 & MIPS_CONF_M)
1038                 c->guest.conf |= BIT(5);
1039         return config4 & MIPS_CONF_M;
1040 }
1041
1042 static inline unsigned int decode_guest_config5(struct cpuinfo_mips *c)
1043 {
1044         unsigned int config5, config5_dyn;
1045
1046         probe_gc0_config_dyn(config5, config5, config5_dyn,
1047                          MIPS_CONF_M | MIPS_CONF5_MRP);
1048
1049         if (config5 & MIPS_CONF5_MRP)
1050                 c->guest.options |= MIPS_CPU_MAAR;
1051         if (config5_dyn & MIPS_CONF5_MRP)
1052                 c->guest.options_dyn |= MIPS_CPU_MAAR;
1053
1054         if (config5 & MIPS_CONF5_LLB)
1055                 c->guest.options |= MIPS_CPU_RW_LLB;
1056
1057         if (config5 & MIPS_CONF_M)
1058                 c->guest.conf |= BIT(6);
1059         return config5 & MIPS_CONF_M;
1060 }
1061
1062 static inline void decode_guest_configs(struct cpuinfo_mips *c)
1063 {
1064         unsigned int ok;
1065
1066         ok = decode_guest_config0(c);
1067         if (ok)
1068                 ok = decode_guest_config1(c);
1069         if (ok)
1070                 ok = decode_guest_config2(c);
1071         if (ok)
1072                 ok = decode_guest_config3(c);
1073         if (ok)
1074                 ok = decode_guest_config4(c);
1075         if (ok)
1076                 decode_guest_config5(c);
1077 }
1078
1079 static inline void cpu_probe_guestctl0(struct cpuinfo_mips *c)
1080 {
1081         unsigned int guestctl0, temp;
1082
1083         guestctl0 = read_c0_guestctl0();
1084
1085         if (guestctl0 & MIPS_GCTL0_G0E)
1086                 c->options |= MIPS_CPU_GUESTCTL0EXT;
1087         if (guestctl0 & MIPS_GCTL0_G1)
1088                 c->options |= MIPS_CPU_GUESTCTL1;
1089         if (guestctl0 & MIPS_GCTL0_G2)
1090                 c->options |= MIPS_CPU_GUESTCTL2;
1091         if (!(guestctl0 & MIPS_GCTL0_RAD)) {
1092                 c->options |= MIPS_CPU_GUESTID;
1093
1094                 /*
1095                  * Probe for Direct Root to Guest (DRG). Set GuestCtl1.RID = 0
1096                  * first, otherwise all data accesses will be fully virtualised
1097                  * as if they were performed by guest mode.
1098                  */
1099                 write_c0_guestctl1(0);
1100                 tlbw_use_hazard();
1101
1102                 write_c0_guestctl0(guestctl0 | MIPS_GCTL0_DRG);
1103                 back_to_back_c0_hazard();
1104                 temp = read_c0_guestctl0();
1105
1106                 if (temp & MIPS_GCTL0_DRG) {
1107                         write_c0_guestctl0(guestctl0);
1108                         c->options |= MIPS_CPU_DRG;
1109                 }
1110         }
1111 }
1112
1113 static inline void cpu_probe_guestctl1(struct cpuinfo_mips *c)
1114 {
1115         if (cpu_has_guestid) {
1116                 /* determine the number of bits of GuestID available */
1117                 write_c0_guestctl1(MIPS_GCTL1_ID);
1118                 back_to_back_c0_hazard();
1119                 c->guestid_mask = (read_c0_guestctl1() & MIPS_GCTL1_ID)
1120                                                 >> MIPS_GCTL1_ID_SHIFT;
1121                 write_c0_guestctl1(0);
1122         }
1123 }
1124
1125 static inline void cpu_probe_gtoffset(struct cpuinfo_mips *c)
1126 {
1127         /* determine the number of bits of GTOffset available */
1128         write_c0_gtoffset(0xffffffff);
1129         back_to_back_c0_hazard();
1130         c->gtoffset_mask = read_c0_gtoffset();
1131         write_c0_gtoffset(0);
1132 }
1133
1134 static inline void cpu_probe_vz(struct cpuinfo_mips *c)
1135 {
1136         cpu_probe_guestctl0(c);
1137         if (cpu_has_guestctl1)
1138                 cpu_probe_guestctl1(c);
1139
1140         cpu_probe_gtoffset(c);
1141
1142         decode_guest_configs(c);
1143 }
1144
1145 #define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \
1146                 | MIPS_CPU_COUNTER)
1147
1148 static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
1149 {
1150         switch (c->processor_id & PRID_IMP_MASK) {
1151         case PRID_IMP_R2000:
1152                 c->cputype = CPU_R2000;
1153                 __cpu_name[cpu] = "R2000";
1154                 c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
1155                 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
1156                              MIPS_CPU_NOFPUEX;
1157                 if (__cpu_has_fpu())
1158                         c->options |= MIPS_CPU_FPU;
1159                 c->tlbsize = 64;
1160                 break;
1161         case PRID_IMP_R3000:
1162                 if ((c->processor_id & PRID_REV_MASK) == PRID_REV_R3000A) {
1163                         if (cpu_has_confreg()) {
1164                                 c->cputype = CPU_R3081E;
1165                                 __cpu_name[cpu] = "R3081";
1166                         } else {
1167                                 c->cputype = CPU_R3000A;
1168                                 __cpu_name[cpu] = "R3000A";
1169                         }
1170                 } else {
1171                         c->cputype = CPU_R3000;
1172                         __cpu_name[cpu] = "R3000";
1173                 }
1174                 c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
1175                 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
1176                              MIPS_CPU_NOFPUEX;
1177                 if (__cpu_has_fpu())
1178                         c->options |= MIPS_CPU_FPU;
1179                 c->tlbsize = 64;
1180                 break;
1181         case PRID_IMP_R4000:
1182                 if (read_c0_config() & CONF_SC) {
1183                         if ((c->processor_id & PRID_REV_MASK) >=
1184                             PRID_REV_R4400) {
1185                                 c->cputype = CPU_R4400PC;
1186                                 __cpu_name[cpu] = "R4400PC";
1187                         } else {
1188                                 c->cputype = CPU_R4000PC;
1189                                 __cpu_name[cpu] = "R4000PC";
1190                         }
1191                 } else {
1192                         int cca = read_c0_config() & CONF_CM_CMASK;
1193                         int mc;
1194
1195                         /*
1196                          * SC and MC versions can't be reliably told apart,
1197                          * but only the latter support coherent caching
1198                          * modes so assume the firmware has set the KSEG0
1199                          * coherency attribute reasonably (if uncached, we
1200                          * assume SC).
1201                          */
1202                         switch (cca) {
1203                         case CONF_CM_CACHABLE_CE:
1204                         case CONF_CM_CACHABLE_COW:
1205                         case CONF_CM_CACHABLE_CUW:
1206                                 mc = 1;
1207                                 break;
1208                         default:
1209                                 mc = 0;
1210                                 break;
1211                         }
1212                         if ((c->processor_id & PRID_REV_MASK) >=
1213                             PRID_REV_R4400) {
1214                                 c->cputype = mc ? CPU_R4400MC : CPU_R4400SC;
1215                                 __cpu_name[cpu] = mc ? "R4400MC" : "R4400SC";
1216                         } else {
1217                                 c->cputype = mc ? CPU_R4000MC : CPU_R4000SC;
1218                                 __cpu_name[cpu] = mc ? "R4000MC" : "R4000SC";
1219                         }
1220                 }
1221
1222                 set_isa(c, MIPS_CPU_ISA_III);
1223                 c->fpu_msk31 |= FPU_CSR_CONDX;
1224                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1225                              MIPS_CPU_WATCH | MIPS_CPU_VCE |
1226                              MIPS_CPU_LLSC;
1227                 c->tlbsize = 48;
1228                 break;
1229         case PRID_IMP_VR41XX:
1230                 set_isa(c, MIPS_CPU_ISA_III);
1231                 c->fpu_msk31 |= FPU_CSR_CONDX;
1232                 c->options = R4K_OPTS;
1233                 c->tlbsize = 32;
1234                 switch (c->processor_id & 0xf0) {
1235                 case PRID_REV_VR4111:
1236                         c->cputype = CPU_VR4111;
1237                         __cpu_name[cpu] = "NEC VR4111";
1238                         break;
1239                 case PRID_REV_VR4121:
1240                         c->cputype = CPU_VR4121;
1241                         __cpu_name[cpu] = "NEC VR4121";
1242                         break;
1243                 case PRID_REV_VR4122:
1244                         if ((c->processor_id & 0xf) < 0x3) {
1245                                 c->cputype = CPU_VR4122;
1246                                 __cpu_name[cpu] = "NEC VR4122";
1247                         } else {
1248                                 c->cputype = CPU_VR4181A;
1249                                 __cpu_name[cpu] = "NEC VR4181A";
1250                         }
1251                         break;
1252                 case PRID_REV_VR4130:
1253                         if ((c->processor_id & 0xf) < 0x4) {
1254                                 c->cputype = CPU_VR4131;
1255                                 __cpu_name[cpu] = "NEC VR4131";
1256                         } else {
1257                                 c->cputype = CPU_VR4133;
1258                                 c->options |= MIPS_CPU_LLSC;
1259                                 __cpu_name[cpu] = "NEC VR4133";
1260                         }
1261                         break;
1262                 default:
1263                         printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n");
1264                         c->cputype = CPU_VR41XX;
1265                         __cpu_name[cpu] = "NEC Vr41xx";
1266                         break;
1267                 }
1268                 break;
1269         case PRID_IMP_R4300:
1270                 c->cputype = CPU_R4300;
1271                 __cpu_name[cpu] = "R4300";
1272                 set_isa(c, MIPS_CPU_ISA_III);
1273                 c->fpu_msk31 |= FPU_CSR_CONDX;
1274                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1275                              MIPS_CPU_LLSC;
1276                 c->tlbsize = 32;
1277                 break;
1278         case PRID_IMP_R4600:
1279                 c->cputype = CPU_R4600;
1280                 __cpu_name[cpu] = "R4600";
1281                 set_isa(c, MIPS_CPU_ISA_III);
1282                 c->fpu_msk31 |= FPU_CSR_CONDX;
1283                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1284                              MIPS_CPU_LLSC;
1285                 c->tlbsize = 48;
1286                 break;
1287         #if 0
1288         case PRID_IMP_R4650:
1289                 /*
1290                  * This processor doesn't have an MMU, so it's not
1291                  * "real easy" to run Linux on it. It is left purely
1292                  * for documentation.  Commented out because it shares
1293                  * it's c0_prid id number with the TX3900.
1294                  */
1295                 c->cputype = CPU_R4650;
1296                 __cpu_name[cpu] = "R4650";
1297                 set_isa(c, MIPS_CPU_ISA_III);
1298                 c->fpu_msk31 |= FPU_CSR_CONDX;
1299                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
1300                 c->tlbsize = 48;
1301                 break;
1302         #endif
1303         case PRID_IMP_TX39:
1304                 c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
1305                 c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE;
1306
1307                 if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) {
1308                         c->cputype = CPU_TX3927;
1309                         __cpu_name[cpu] = "TX3927";
1310                         c->tlbsize = 64;
1311                 } else {
1312                         switch (c->processor_id & PRID_REV_MASK) {
1313                         case PRID_REV_TX3912:
1314                                 c->cputype = CPU_TX3912;
1315                                 __cpu_name[cpu] = "TX3912";
1316                                 c->tlbsize = 32;
1317                                 break;
1318                         case PRID_REV_TX3922:
1319                                 c->cputype = CPU_TX3922;
1320                                 __cpu_name[cpu] = "TX3922";
1321                                 c->tlbsize = 64;
1322                                 break;
1323                         }
1324                 }
1325                 break;
1326         case PRID_IMP_R4700:
1327                 c->cputype = CPU_R4700;
1328                 __cpu_name[cpu] = "R4700";
1329                 set_isa(c, MIPS_CPU_ISA_III);
1330                 c->fpu_msk31 |= FPU_CSR_CONDX;
1331                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1332                              MIPS_CPU_LLSC;
1333                 c->tlbsize = 48;
1334                 break;
1335         case PRID_IMP_TX49:
1336                 c->cputype = CPU_TX49XX;
1337                 __cpu_name[cpu] = "R49XX";
1338                 set_isa(c, MIPS_CPU_ISA_III);
1339                 c->fpu_msk31 |= FPU_CSR_CONDX;
1340                 c->options = R4K_OPTS | MIPS_CPU_LLSC;
1341                 if (!(c->processor_id & 0x08))
1342                         c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR;
1343                 c->tlbsize = 48;
1344                 break;
1345         case PRID_IMP_R5000:
1346                 c->cputype = CPU_R5000;
1347                 __cpu_name[cpu] = "R5000";
1348                 set_isa(c, MIPS_CPU_ISA_IV);
1349                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1350                              MIPS_CPU_LLSC;
1351                 c->tlbsize = 48;
1352                 break;
1353         case PRID_IMP_R5432:
1354                 c->cputype = CPU_R5432;
1355                 __cpu_name[cpu] = "R5432";
1356                 set_isa(c, MIPS_CPU_ISA_IV);
1357                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1358                              MIPS_CPU_WATCH | MIPS_CPU_LLSC;
1359                 c->tlbsize = 48;
1360                 break;
1361         case PRID_IMP_R5500:
1362                 c->cputype = CPU_R5500;
1363                 __cpu_name[cpu] = "R5500";
1364                 set_isa(c, MIPS_CPU_ISA_IV);
1365                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1366                              MIPS_CPU_WATCH | MIPS_CPU_LLSC;
1367                 c->tlbsize = 48;
1368                 break;
1369         case PRID_IMP_NEVADA:
1370                 c->cputype = CPU_NEVADA;
1371                 __cpu_name[cpu] = "Nevada";
1372                 set_isa(c, MIPS_CPU_ISA_IV);
1373                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1374                              MIPS_CPU_DIVEC | MIPS_CPU_LLSC;
1375                 c->tlbsize = 48;
1376                 break;
1377         case PRID_IMP_R6000:
1378                 c->cputype = CPU_R6000;
1379                 __cpu_name[cpu] = "R6000";
1380                 set_isa(c, MIPS_CPU_ISA_II);
1381                 c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
1382                 c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
1383                              MIPS_CPU_LLSC;
1384                 c->tlbsize = 32;
1385                 break;
1386         case PRID_IMP_R6000A:
1387                 c->cputype = CPU_R6000A;
1388                 __cpu_name[cpu] = "R6000A";
1389                 set_isa(c, MIPS_CPU_ISA_II);
1390                 c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
1391                 c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
1392                              MIPS_CPU_LLSC;
1393                 c->tlbsize = 32;
1394                 break;
1395         case PRID_IMP_RM7000:
1396                 c->cputype = CPU_RM7000;
1397                 __cpu_name[cpu] = "RM7000";
1398                 set_isa(c, MIPS_CPU_ISA_IV);
1399                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
1400                              MIPS_CPU_LLSC;
1401                 /*
1402                  * Undocumented RM7000:  Bit 29 in the info register of
1403                  * the RM7000 v2.0 indicates if the TLB has 48 or 64
1404                  * entries.
1405                  *
1406                  * 29      1 =>    64 entry JTLB
1407                  *         0 =>    48 entry JTLB
1408                  */
1409                 c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
1410                 break;
1411         case PRID_IMP_R8000:
1412                 c->cputype = CPU_R8000;
1413                 __cpu_name[cpu] = "RM8000";
1414                 set_isa(c, MIPS_CPU_ISA_IV);
1415                 c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
1416                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
1417                              MIPS_CPU_LLSC;
1418                 c->tlbsize = 384;      /* has weird TLB: 3-way x 128 */
1419                 break;
1420         case PRID_IMP_R10000:
1421                 c->cputype = CPU_R10000;
1422                 __cpu_name[cpu] = "R10000";
1423                 set_isa(c, MIPS_CPU_ISA_IV);
1424                 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
1425                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
1426                              MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
1427                              MIPS_CPU_LLSC;
1428                 c->tlbsize = 64;
1429                 break;
1430         case PRID_IMP_R12000:
1431                 c->cputype = CPU_R12000;
1432                 __cpu_name[cpu] = "R12000";
1433                 set_isa(c, MIPS_CPU_ISA_IV);
1434                 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
1435                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
1436                              MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
1437                              MIPS_CPU_LLSC | MIPS_CPU_BP_GHIST;
1438                 c->tlbsize = 64;
1439                 break;
1440         case PRID_IMP_R14000:
1441                 if (((c->processor_id >> 4) & 0x0f) > 2) {
1442                         c->cputype = CPU_R16000;
1443                         __cpu_name[cpu] = "R16000";
1444                 } else {
1445                         c->cputype = CPU_R14000;
1446                         __cpu_name[cpu] = "R14000";
1447                 }
1448                 set_isa(c, MIPS_CPU_ISA_IV);
1449                 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
1450                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
1451                              MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
1452                              MIPS_CPU_LLSC | MIPS_CPU_BP_GHIST;
1453                 c->tlbsize = 64;
1454                 break;
1455         case PRID_IMP_LOONGSON_64:  /* Loongson-2/3 */
1456                 switch (c->processor_id & PRID_REV_MASK) {
1457                 case PRID_REV_LOONGSON2E:
1458                         c->cputype = CPU_LOONGSON2;
1459                         __cpu_name[cpu] = "ICT Loongson-2";
1460                         set_elf_platform(cpu, "loongson2e");
1461                         set_isa(c, MIPS_CPU_ISA_III);
1462                         c->fpu_msk31 |= FPU_CSR_CONDX;
1463                         break;
1464                 case PRID_REV_LOONGSON2F:
1465                         c->cputype = CPU_LOONGSON2;
1466                         __cpu_name[cpu] = "ICT Loongson-2";
1467                         set_elf_platform(cpu, "loongson2f");
1468                         set_isa(c, MIPS_CPU_ISA_III);
1469                         c->fpu_msk31 |= FPU_CSR_CONDX;
1470                         break;
1471                 case PRID_REV_LOONGSON3A_R1:
1472                         c->cputype = CPU_LOONGSON3;
1473                         __cpu_name[cpu] = "ICT Loongson-3";
1474                         set_elf_platform(cpu, "loongson3a");
1475                         set_isa(c, MIPS_CPU_ISA_M64R1);
1476                         break;
1477                 case PRID_REV_LOONGSON3B_R1:
1478                 case PRID_REV_LOONGSON3B_R2:
1479                         c->cputype = CPU_LOONGSON3;
1480                         __cpu_name[cpu] = "ICT Loongson-3";
1481                         set_elf_platform(cpu, "loongson3b");
1482                         set_isa(c, MIPS_CPU_ISA_M64R1);
1483                         break;
1484                 }
1485
1486                 c->options = R4K_OPTS |
1487                              MIPS_CPU_FPU | MIPS_CPU_LLSC |
1488                              MIPS_CPU_32FPR;
1489                 c->tlbsize = 64;
1490                 c->writecombine = _CACHE_UNCACHED_ACCELERATED;
1491                 break;
1492         case PRID_IMP_LOONGSON_32:  /* Loongson-1 */
1493                 decode_configs(c);
1494
1495                 c->cputype = CPU_LOONGSON1;
1496
1497                 switch (c->processor_id & PRID_REV_MASK) {
1498                 case PRID_REV_LOONGSON1B:
1499                         __cpu_name[cpu] = "Loongson 1B";
1500                         break;
1501                 }
1502
1503                 break;
1504         }
1505 }
1506
1507 static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
1508 {
1509         c->writecombine = _CACHE_UNCACHED_ACCELERATED;
1510         switch (c->processor_id & PRID_IMP_MASK) {
1511         case PRID_IMP_QEMU_GENERIC:
1512                 c->writecombine = _CACHE_UNCACHED;
1513                 c->cputype = CPU_QEMU_GENERIC;
1514                 __cpu_name[cpu] = "MIPS GENERIC QEMU";
1515                 break;
1516         case PRID_IMP_4KC:
1517                 c->cputype = CPU_4KC;
1518                 c->writecombine = _CACHE_UNCACHED;
1519                 __cpu_name[cpu] = "MIPS 4Kc";
1520                 break;
1521         case PRID_IMP_4KEC:
1522         case PRID_IMP_4KECR2:
1523                 c->cputype = CPU_4KEC;
1524                 c->writecombine = _CACHE_UNCACHED;
1525                 __cpu_name[cpu] = "MIPS 4KEc";
1526                 break;
1527         case PRID_IMP_4KSC:
1528         case PRID_IMP_4KSD:
1529                 c->cputype = CPU_4KSC;
1530                 c->writecombine = _CACHE_UNCACHED;
1531                 __cpu_name[cpu] = "MIPS 4KSc";
1532                 break;
1533         case PRID_IMP_5KC:
1534                 c->cputype = CPU_5KC;
1535                 c->writecombine = _CACHE_UNCACHED;
1536                 __cpu_name[cpu] = "MIPS 5Kc";
1537                 break;
1538         case PRID_IMP_5KE:
1539                 c->cputype = CPU_5KE;
1540                 c->writecombine = _CACHE_UNCACHED;
1541                 __cpu_name[cpu] = "MIPS 5KE";
1542                 break;
1543         case PRID_IMP_20KC:
1544                 c->cputype = CPU_20KC;
1545                 c->writecombine = _CACHE_UNCACHED;
1546                 __cpu_name[cpu] = "MIPS 20Kc";
1547                 break;
1548         case PRID_IMP_24K:
1549                 c->cputype = CPU_24K;
1550                 c->writecombine = _CACHE_UNCACHED;
1551                 __cpu_name[cpu] = "MIPS 24Kc";
1552                 break;
1553         case PRID_IMP_24KE:
1554                 c->cputype = CPU_24K;
1555                 c->writecombine = _CACHE_UNCACHED;
1556                 __cpu_name[cpu] = "MIPS 24KEc";
1557                 break;
1558         case PRID_IMP_25KF:
1559                 c->cputype = CPU_25KF;
1560                 c->writecombine = _CACHE_UNCACHED;
1561                 __cpu_name[cpu] = "MIPS 25Kc";
1562                 break;
1563         case PRID_IMP_34K:
1564                 c->cputype = CPU_34K;
1565                 c->writecombine = _CACHE_UNCACHED;
1566                 __cpu_name[cpu] = "MIPS 34Kc";
1567                 break;
1568         case PRID_IMP_74K:
1569                 c->cputype = CPU_74K;
1570                 c->writecombine = _CACHE_UNCACHED;
1571                 __cpu_name[cpu] = "MIPS 74Kc";
1572                 break;
1573         case PRID_IMP_M14KC:
1574                 c->cputype = CPU_M14KC;
1575                 c->writecombine = _CACHE_UNCACHED;
1576                 __cpu_name[cpu] = "MIPS M14Kc";
1577                 break;
1578         case PRID_IMP_M14KEC:
1579                 c->cputype = CPU_M14KEC;
1580                 c->writecombine = _CACHE_UNCACHED;
1581                 __cpu_name[cpu] = "MIPS M14KEc";
1582                 break;
1583         case PRID_IMP_1004K:
1584                 c->cputype = CPU_1004K;
1585                 c->writecombine = _CACHE_UNCACHED;
1586                 __cpu_name[cpu] = "MIPS 1004Kc";
1587                 break;
1588         case PRID_IMP_1074K:
1589                 c->cputype = CPU_1074K;
1590                 c->writecombine = _CACHE_UNCACHED;
1591                 __cpu_name[cpu] = "MIPS 1074Kc";
1592                 break;
1593         case PRID_IMP_INTERAPTIV_UP:
1594                 c->cputype = CPU_INTERAPTIV;
1595                 __cpu_name[cpu] = "MIPS interAptiv";
1596                 break;
1597         case PRID_IMP_INTERAPTIV_MP:
1598                 c->cputype = CPU_INTERAPTIV;
1599                 __cpu_name[cpu] = "MIPS interAptiv (multi)";
1600                 break;
1601         case PRID_IMP_PROAPTIV_UP:
1602                 c->cputype = CPU_PROAPTIV;
1603                 __cpu_name[cpu] = "MIPS proAptiv";
1604                 break;
1605         case PRID_IMP_PROAPTIV_MP:
1606                 c->cputype = CPU_PROAPTIV;
1607                 __cpu_name[cpu] = "MIPS proAptiv (multi)";
1608                 break;
1609         case PRID_IMP_P5600:
1610                 c->cputype = CPU_P5600;
1611                 __cpu_name[cpu] = "MIPS P5600";
1612                 break;
1613         case PRID_IMP_P6600:
1614                 c->cputype = CPU_P6600;
1615                 __cpu_name[cpu] = "MIPS P6600";
1616                 break;
1617         case PRID_IMP_I6400:
1618                 c->cputype = CPU_I6400;
1619                 __cpu_name[cpu] = "MIPS I6400";
1620                 break;
1621         case PRID_IMP_M5150:
1622                 c->cputype = CPU_M5150;
1623                 __cpu_name[cpu] = "MIPS M5150";
1624                 break;
1625         case PRID_IMP_M6250:
1626                 c->cputype = CPU_M6250;
1627                 __cpu_name[cpu] = "MIPS M6250";
1628                 break;
1629         }
1630
1631         decode_configs(c);
1632
1633         spram_config();
1634 }
1635
1636 static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
1637 {
1638         decode_configs(c);
1639         switch (c->processor_id & PRID_IMP_MASK) {
1640         case PRID_IMP_AU1_REV1:
1641         case PRID_IMP_AU1_REV2:
1642                 c->cputype = CPU_ALCHEMY;
1643                 switch ((c->processor_id >> 24) & 0xff) {
1644                 case 0:
1645                         __cpu_name[cpu] = "Au1000";
1646                         break;
1647                 case 1:
1648                         __cpu_name[cpu] = "Au1500";
1649                         break;
1650                 case 2:
1651                         __cpu_name[cpu] = "Au1100";
1652                         break;
1653                 case 3:
1654                         __cpu_name[cpu] = "Au1550";
1655                         break;
1656                 case 4:
1657                         __cpu_name[cpu] = "Au1200";
1658                         if ((c->processor_id & PRID_REV_MASK) == 2)
1659                                 __cpu_name[cpu] = "Au1250";
1660                         break;
1661                 case 5:
1662                         __cpu_name[cpu] = "Au1210";
1663                         break;
1664                 default:
1665                         __cpu_name[cpu] = "Au1xxx";
1666                         break;
1667                 }
1668                 break;
1669         }
1670 }
1671
1672 static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu)
1673 {
1674         decode_configs(c);
1675
1676         c->writecombine = _CACHE_UNCACHED_ACCELERATED;
1677         switch (c->processor_id & PRID_IMP_MASK) {
1678         case PRID_IMP_SB1:
1679                 c->cputype = CPU_SB1;
1680                 __cpu_name[cpu] = "SiByte SB1";
1681                 /* FPU in pass1 is known to have issues. */
1682                 if ((c->processor_id & PRID_REV_MASK) < 0x02)
1683                         c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR);
1684                 break;
1685         case PRID_IMP_SB1A:
1686                 c->cputype = CPU_SB1A;
1687                 __cpu_name[cpu] = "SiByte SB1A";
1688                 break;
1689         }
1690 }
1691
1692 static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu)
1693 {
1694         decode_configs(c);
1695         switch (c->processor_id & PRID_IMP_MASK) {
1696         case PRID_IMP_SR71000:
1697                 c->cputype = CPU_SR71000;
1698                 __cpu_name[cpu] = "Sandcraft SR71000";
1699                 c->scache.ways = 8;
1700                 c->tlbsize = 64;
1701                 break;
1702         }
1703 }
1704
1705 static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu)
1706 {
1707         decode_configs(c);
1708         switch (c->processor_id & PRID_IMP_MASK) {
1709         case PRID_IMP_PR4450:
1710                 c->cputype = CPU_PR4450;
1711                 __cpu_name[cpu] = "Philips PR4450";
1712                 set_isa(c, MIPS_CPU_ISA_M32R1);
1713                 break;
1714         }
1715 }
1716
1717 static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
1718 {
1719         decode_configs(c);
1720         switch (c->processor_id & PRID_IMP_MASK) {
1721         case PRID_IMP_BMIPS32_REV4:
1722         case PRID_IMP_BMIPS32_REV8:
1723                 c->cputype = CPU_BMIPS32;
1724                 __cpu_name[cpu] = "Broadcom BMIPS32";
1725                 set_elf_platform(cpu, "bmips32");
1726                 break;
1727         case PRID_IMP_BMIPS3300:
1728         case PRID_IMP_BMIPS3300_ALT:
1729         case PRID_IMP_BMIPS3300_BUG:
1730                 c->cputype = CPU_BMIPS3300;
1731                 __cpu_name[cpu] = "Broadcom BMIPS3300";
1732                 set_elf_platform(cpu, "bmips3300");
1733                 break;
1734         case PRID_IMP_BMIPS43XX: {
1735                 int rev = c->processor_id & PRID_REV_MASK;
1736
1737                 if (rev >= PRID_REV_BMIPS4380_LO &&
1738                                 rev <= PRID_REV_BMIPS4380_HI) {
1739                         c->cputype = CPU_BMIPS4380;
1740                         __cpu_name[cpu] = "Broadcom BMIPS4380";
1741                         set_elf_platform(cpu, "bmips4380");
1742                         c->options |= MIPS_CPU_RIXI;
1743                 } else {
1744                         c->cputype = CPU_BMIPS4350;
1745                         __cpu_name[cpu] = "Broadcom BMIPS4350";
1746                         set_elf_platform(cpu, "bmips4350");
1747                 }
1748                 break;
1749         }
1750         case PRID_IMP_BMIPS5000:
1751         case PRID_IMP_BMIPS5200:
1752                 c->cputype = CPU_BMIPS5000;
1753                 if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_BMIPS5200)
1754                         __cpu_name[cpu] = "Broadcom BMIPS5200";
1755                 else
1756                         __cpu_name[cpu] = "Broadcom BMIPS5000";
1757                 set_elf_platform(cpu, "bmips5000");
1758                 c->options |= MIPS_CPU_ULRI | MIPS_CPU_RIXI;
1759                 break;
1760         }
1761 }
1762
1763 static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
1764 {
1765         decode_configs(c);
1766         switch (c->processor_id & PRID_IMP_MASK) {
1767         case PRID_IMP_CAVIUM_CN38XX:
1768         case PRID_IMP_CAVIUM_CN31XX:
1769         case PRID_IMP_CAVIUM_CN30XX:
1770                 c->cputype = CPU_CAVIUM_OCTEON;
1771                 __cpu_name[cpu] = "Cavium Octeon";
1772                 goto platform;
1773         case PRID_IMP_CAVIUM_CN58XX:
1774         case PRID_IMP_CAVIUM_CN56XX:
1775         case PRID_IMP_CAVIUM_CN50XX:
1776         case PRID_IMP_CAVIUM_CN52XX:
1777                 c->cputype = CPU_CAVIUM_OCTEON_PLUS;
1778                 __cpu_name[cpu] = "Cavium Octeon+";
1779 platform:
1780                 set_elf_platform(cpu, "octeon");
1781                 break;
1782         case PRID_IMP_CAVIUM_CN61XX:
1783         case PRID_IMP_CAVIUM_CN63XX:
1784         case PRID_IMP_CAVIUM_CN66XX:
1785         case PRID_IMP_CAVIUM_CN68XX:
1786         case PRID_IMP_CAVIUM_CNF71XX:
1787                 c->cputype = CPU_CAVIUM_OCTEON2;
1788                 __cpu_name[cpu] = "Cavium Octeon II";
1789                 set_elf_platform(cpu, "octeon2");
1790                 break;
1791         case PRID_IMP_CAVIUM_CN70XX:
1792         case PRID_IMP_CAVIUM_CN73XX:
1793         case PRID_IMP_CAVIUM_CNF75XX:
1794         case PRID_IMP_CAVIUM_CN78XX:
1795                 c->cputype = CPU_CAVIUM_OCTEON3;
1796                 __cpu_name[cpu] = "Cavium Octeon III";
1797                 set_elf_platform(cpu, "octeon3");
1798                 break;
1799         default:
1800                 printk(KERN_INFO "Unknown Octeon chip!\n");
1801                 c->cputype = CPU_UNKNOWN;
1802                 break;
1803         }
1804 }
1805
1806 static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu)
1807 {
1808         switch (c->processor_id & PRID_IMP_MASK) {
1809         case PRID_IMP_LOONGSON_64:  /* Loongson-2/3 */
1810                 switch (c->processor_id & PRID_REV_MASK) {
1811                 case PRID_REV_LOONGSON3A_R2:
1812                         c->cputype = CPU_LOONGSON3;
1813                         __cpu_name[cpu] = "ICT Loongson-3";
1814                         set_elf_platform(cpu, "loongson3a");
1815                         set_isa(c, MIPS_CPU_ISA_M64R2);
1816                         break;
1817                 }
1818
1819                 decode_configs(c);
1820                 c->options |= MIPS_CPU_TLBINV | MIPS_CPU_LDPTE;
1821                 c->writecombine = _CACHE_UNCACHED_ACCELERATED;
1822                 break;
1823         default:
1824                 panic("Unknown Loongson Processor ID!");
1825                 break;
1826         }
1827 }
1828
1829 static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu)
1830 {
1831         decode_configs(c);
1832         /* JZRISC does not implement the CP0 counter. */
1833         c->options &= ~MIPS_CPU_COUNTER;
1834         BUG_ON(!__builtin_constant_p(cpu_has_counter) || cpu_has_counter);
1835         switch (c->processor_id & PRID_IMP_MASK) {
1836         case PRID_IMP_JZRISC:
1837                 c->cputype = CPU_JZRISC;
1838                 c->writecombine = _CACHE_UNCACHED_ACCELERATED;
1839                 __cpu_name[cpu] = "Ingenic JZRISC";
1840                 break;
1841         default:
1842                 panic("Unknown Ingenic Processor ID!");
1843                 break;
1844         }
1845 }
1846
1847 static inline void cpu_probe_netlogic(struct cpuinfo_mips *c, int cpu)
1848 {
1849         decode_configs(c);
1850
1851         if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_NETLOGIC_AU13XX) {
1852                 c->cputype = CPU_ALCHEMY;
1853                 __cpu_name[cpu] = "Au1300";
1854                 /* following stuff is not for Alchemy */
1855                 return;
1856         }
1857
1858         c->options = (MIPS_CPU_TLB       |
1859                         MIPS_CPU_4KEX    |
1860                         MIPS_CPU_COUNTER |
1861                         MIPS_CPU_DIVEC   |
1862                         MIPS_CPU_WATCH   |
1863                         MIPS_CPU_EJTAG   |
1864                         MIPS_CPU_LLSC);
1865
1866         switch (c->processor_id & PRID_IMP_MASK) {
1867         case PRID_IMP_NETLOGIC_XLP2XX:
1868         case PRID_IMP_NETLOGIC_XLP9XX:
1869         case PRID_IMP_NETLOGIC_XLP5XX:
1870                 c->cputype = CPU_XLP;
1871                 __cpu_name[cpu] = "Broadcom XLPII";
1872                 break;
1873
1874         case PRID_IMP_NETLOGIC_XLP8XX:
1875         case PRID_IMP_NETLOGIC_XLP3XX:
1876                 c->cputype = CPU_XLP;
1877                 __cpu_name[cpu] = "Netlogic XLP";
1878                 break;
1879
1880         case PRID_IMP_NETLOGIC_XLR732:
1881         case PRID_IMP_NETLOGIC_XLR716:
1882         case PRID_IMP_NETLOGIC_XLR532:
1883         case PRID_IMP_NETLOGIC_XLR308:
1884         case PRID_IMP_NETLOGIC_XLR532C:
1885         case PRID_IMP_NETLOGIC_XLR516C:
1886         case PRID_IMP_NETLOGIC_XLR508C:
1887         case PRID_IMP_NETLOGIC_XLR308C:
1888                 c->cputype = CPU_XLR;
1889                 __cpu_name[cpu] = "Netlogic XLR";
1890                 break;
1891
1892         case PRID_IMP_NETLOGIC_XLS608:
1893         case PRID_IMP_NETLOGIC_XLS408:
1894         case PRID_IMP_NETLOGIC_XLS404:
1895         case PRID_IMP_NETLOGIC_XLS208:
1896         case PRID_IMP_NETLOGIC_XLS204:
1897         case PRID_IMP_NETLOGIC_XLS108:
1898         case PRID_IMP_NETLOGIC_XLS104:
1899         case PRID_IMP_NETLOGIC_XLS616B:
1900         case PRID_IMP_NETLOGIC_XLS608B:
1901         case PRID_IMP_NETLOGIC_XLS416B:
1902         case PRID_IMP_NETLOGIC_XLS412B:
1903         case PRID_IMP_NETLOGIC_XLS408B:
1904         case PRID_IMP_NETLOGIC_XLS404B:
1905                 c->cputype = CPU_XLR;
1906                 __cpu_name[cpu] = "Netlogic XLS";
1907                 break;
1908
1909         default:
1910                 pr_info("Unknown Netlogic chip id [%02x]!\n",
1911                        c->processor_id);
1912                 c->cputype = CPU_XLR;
1913                 break;
1914         }
1915
1916         if (c->cputype == CPU_XLP) {
1917                 set_isa(c, MIPS_CPU_ISA_M64R2);
1918                 c->options |= (MIPS_CPU_FPU | MIPS_CPU_ULRI | MIPS_CPU_MCHECK);
1919                 /* This will be updated again after all threads are woken up */
1920                 c->tlbsize = ((read_c0_config6() >> 16) & 0xffff) + 1;
1921         } else {
1922                 set_isa(c, MIPS_CPU_ISA_M64R1);
1923                 c->tlbsize = ((read_c0_config1() >> 25) & 0x3f) + 1;
1924         }
1925         c->kscratch_mask = 0xf;
1926 }
1927
1928 #ifdef CONFIG_64BIT
1929 /* For use by uaccess.h */
1930 u64 __ua_limit;
1931 EXPORT_SYMBOL(__ua_limit);
1932 #endif
1933
1934 const char *__cpu_name[NR_CPUS];
1935 const char *__elf_platform;
1936
1937 void cpu_probe(void)
1938 {
1939         struct cpuinfo_mips *c = &current_cpu_data;
1940         unsigned int cpu = smp_processor_id();
1941
1942         c->processor_id = PRID_IMP_UNKNOWN;
1943         c->fpu_id       = FPIR_IMP_NONE;
1944         c->cputype      = CPU_UNKNOWN;
1945         c->writecombine = _CACHE_UNCACHED;
1946
1947         c->fpu_csr31    = FPU_CSR_RN;
1948         c->fpu_msk31    = FPU_CSR_RSVD | FPU_CSR_ABS2008 | FPU_CSR_NAN2008;
1949
1950         c->processor_id = read_c0_prid();
1951         switch (c->processor_id & PRID_COMP_MASK) {
1952         case PRID_COMP_LEGACY:
1953                 cpu_probe_legacy(c, cpu);
1954                 break;
1955         case PRID_COMP_MIPS:
1956                 cpu_probe_mips(c, cpu);
1957                 break;
1958         case PRID_COMP_ALCHEMY:
1959                 cpu_probe_alchemy(c, cpu);
1960                 break;
1961         case PRID_COMP_SIBYTE:
1962                 cpu_probe_sibyte(c, cpu);
1963                 break;
1964         case PRID_COMP_BROADCOM:
1965                 cpu_probe_broadcom(c, cpu);
1966                 break;
1967         case PRID_COMP_SANDCRAFT:
1968                 cpu_probe_sandcraft(c, cpu);
1969                 break;
1970         case PRID_COMP_NXP:
1971                 cpu_probe_nxp(c, cpu);
1972                 break;
1973         case PRID_COMP_CAVIUM:
1974                 cpu_probe_cavium(c, cpu);
1975                 break;
1976         case PRID_COMP_LOONGSON:
1977                 cpu_probe_loongson(c, cpu);
1978                 break;
1979         case PRID_COMP_INGENIC_D0:
1980         case PRID_COMP_INGENIC_D1:
1981         case PRID_COMP_INGENIC_E1:
1982                 cpu_probe_ingenic(c, cpu);
1983                 break;
1984         case PRID_COMP_NETLOGIC:
1985                 cpu_probe_netlogic(c, cpu);
1986                 break;
1987         }
1988
1989         BUG_ON(!__cpu_name[cpu]);
1990         BUG_ON(c->cputype == CPU_UNKNOWN);
1991
1992         /*
1993          * Platform code can force the cpu type to optimize code
1994          * generation. In that case be sure the cpu type is correctly
1995          * manually setup otherwise it could trigger some nasty bugs.
1996          */
1997         BUG_ON(current_cpu_type() != c->cputype);
1998
1999         if (cpu_has_rixi) {
2000                 /* Enable the RIXI exceptions */
2001                 set_c0_pagegrain(PG_IEC);
2002                 back_to_back_c0_hazard();
2003                 /* Verify the IEC bit is set */
2004                 if (read_c0_pagegrain() & PG_IEC)
2005                         c->options |= MIPS_CPU_RIXIEX;
2006         }
2007
2008         if (mips_fpu_disabled)
2009                 c->options &= ~MIPS_CPU_FPU;
2010
2011         if (mips_dsp_disabled)
2012                 c->ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P);
2013
2014         if (mips_htw_disabled) {
2015                 c->options &= ~MIPS_CPU_HTW;
2016                 write_c0_pwctl(read_c0_pwctl() &
2017                                ~(1 << MIPS_PWCTL_PWEN_SHIFT));
2018         }
2019
2020         if (c->options & MIPS_CPU_FPU)
2021                 cpu_set_fpu_opts(c);
2022         else
2023                 cpu_set_nofpu_opts(c);
2024
2025         if (cpu_has_bp_ghist)
2026                 write_c0_r10k_diag(read_c0_r10k_diag() |
2027                                    R10K_DIAG_E_GHIST);
2028
2029         if (cpu_has_mips_r2_r6) {
2030                 c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
2031                 /* R2 has Performance Counter Interrupt indicator */
2032                 c->options |= MIPS_CPU_PCI;
2033         }
2034         else
2035                 c->srsets = 1;
2036
2037         if (cpu_has_mips_r6)
2038                 elf_hwcap |= HWCAP_MIPS_R6;
2039
2040         if (cpu_has_msa) {
2041                 c->msa_id = cpu_get_msa_id();
2042                 WARN(c->msa_id & MSA_IR_WRPF,
2043                      "Vector register partitioning unimplemented!");
2044                 elf_hwcap |= HWCAP_MIPS_MSA;
2045         }
2046
2047         if (cpu_has_vz)
2048                 cpu_probe_vz(c);
2049
2050         cpu_probe_vmbits(c);
2051
2052 #ifdef CONFIG_64BIT
2053         if (cpu == 0)
2054                 __ua_limit = ~((1ull << cpu_vmbits) - 1);
2055 #endif
2056 }
2057
2058 void cpu_report(void)
2059 {
2060         struct cpuinfo_mips *c = &current_cpu_data;
2061
2062         pr_info("CPU%d revision is: %08x (%s)\n",
2063                 smp_processor_id(), c->processor_id, cpu_name_string());
2064         if (c->options & MIPS_CPU_FPU)
2065                 printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id);
2066         if (cpu_has_msa)
2067                 pr_info("MSA revision is: %08x\n", c->msa_id);
2068 }