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/fpu.h>
  24 #include <asm/mipsregs.h>
  25 #include <asm/watch.h>
  26 #include <asm/elf.h>
  27 #include <asm/spram.h>
  28 #include <asm/uaccess.h>
  29
  30 /*
  31  * Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
  32  * the implementation of the "wait" feature differs between CPU families. This
  33  * points to the function that implements CPU specific wait.
  34  * The wait instruction stops the pipeline and reduces the power consumption of
  35  * the CPU very much.
  36  */
  37 void (*cpu_wait)(void);
  38 EXPORT_SYMBOL(cpu_wait);
  39
  40 static void r3081_wait(void)
  41 {
  42         unsigned long cfg = read_c0_conf();
  43         write_c0_conf(cfg | R30XX_CONF_HALT);
  44 }
  45
  46 static void r39xx_wait(void)
  47 {
  48         local_irq_disable();
  49         if (!need_resched())
  50                 write_c0_conf(read_c0_conf() | TX39_CONF_HALT);
  51         local_irq_enable();
  52 }
  53
  54 extern void r4k_wait(void);
  55
  56 /*
  57  * This variant is preferable as it allows testing need_resched and going to
  58  * sleep depending on the outcome atomically.  Unfortunately the "It is
  59  * implementation-dependent whether the pipeline restarts when a non-enabled
  60  * interrupt is requested" restriction in the MIPS32/MIPS64 architecture makes
  61  * using this version a gamble.
  62  */
  63 void r4k_wait_irqoff(void)
  64 {
  65         local_irq_disable();
  66         if (!need_resched())
  67                 __asm__("       .set    push            \n"
  68                         "       .set    mips3           \n"
  69                         "       wait                    \n"
  70                         "       .set    pop             \n");
  71         local_irq_enable();
  72         __asm__("       .globl __pastwait       \n"
  73                 "__pastwait:                    \n");
  74 }
  75
  76 /*
  77  * The RM7000 variant has to handle erratum 38.  The workaround is to not
  78  * have any pending stores when the WAIT instruction is executed.
  79  */
  80 static void rm7k_wait_irqoff(void)
  81 {
  82         local_irq_disable();
  83         if (!need_resched())
  84                 __asm__(
  85                 "       .set    push                                    \n"
  86                 "       .set    mips3                                   \n"
  87                 "       .set    noat                                    \n"
  88                 "       mfc0    $1, $12                                 \n"
  89                 "       sync                                            \n"
  90                 "       mtc0    $1, $12         # stalls until W stage  \n"
  91                 "       wait                                            \n"
  92                 "       mtc0    $1, $12         # stalls until W stage  \n"
  93                 "       .set    pop                                     \n");
  94         local_irq_enable();
  95 }
  96
  97 /*
  98  * The Au1xxx wait is available only if using 32khz counter or
  99  * external timer source, but specifically not CP0 Counter.
 100  * alchemy/common/time.c may override cpu_wait!
 101  */
 102 static void au1k_wait(void)
 103 {
 104         __asm__("       .set    mips3                   \n"
 105                 "       cache   0x14, 0(%0)             \n"
 106                 "       cache   0x14, 32(%0)            \n"
 107                 "       sync                            \n"
 108                 "       nop                             \n"
 109                 "       wait                            \n"
 110                 "       nop                             \n"
 111                 "       nop                             \n"
 112                 "       nop                             \n"
 113                 "       nop                             \n"
 114                 "       .set    mips0                   \n"
 115                 : : "r" (au1k_wait));
 116 }
 117
 118 static int __initdata nowait;
 119
 120 static int __init wait_disable(char *s)
 121 {
 122         nowait = 1;
 123
 124         return 1;
 125 }
 126
 127 __setup("nowait", wait_disable);
 128
 129 static int __cpuinitdata mips_fpu_disabled;
 130
 131 static int __init fpu_disable(char *s)
 132 {
 133         cpu_data[0].options &= ~MIPS_CPU_FPU;
 134         mips_fpu_disabled = 1;
 135
 136         return 1;
 137 }
 138
 139 __setup("nofpu", fpu_disable);
 140
 141 int __cpuinitdata mips_dsp_disabled;
 142
 143 static int __init dsp_disable(char *s)
 144 {
 145         cpu_data[0].ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P);
 146         mips_dsp_disabled = 1;
 147
 148         return 1;
 149 }
 150
 151 __setup("nodsp", dsp_disable);
 152
 153 void __init check_wait(void)
 154 {
 155         struct cpuinfo_mips *c = &current_cpu_data;
 156
 157         if (nowait) {
 158                 printk("Wait instruction disabled.\n");
 159                 return;
 160         }
 161
 162         switch (c->cputype) {
 163         case CPU_R3081:
 164         case CPU_R3081E:
 165                 cpu_wait = r3081_wait;
 166                 break;
 167         case CPU_TX3927:
 168                 cpu_wait = r39xx_wait;
 169                 break;
 170         case CPU_R4200:
 171 /*      case CPU_R4300: */
 172         case CPU_R4600:
 173         case CPU_R4640:
 174         case CPU_R4650:
 175         case CPU_R4700:
 176         case CPU_R5000:
 177         case CPU_R5500:
 178         case CPU_NEVADA:
 179         case CPU_4KC:
 180         case CPU_4KEC:
 181         case CPU_4KSC:
 182         case CPU_5KC:
 183         case CPU_25KF:
 184         case CPU_PR4450:
 185         case CPU_BMIPS3300:
 186         case CPU_BMIPS4350:
 187         case CPU_BMIPS4380:
 188         case CPU_BMIPS5000:
 189         case CPU_CAVIUM_OCTEON:
 190         case CPU_CAVIUM_OCTEON_PLUS:
 191         case CPU_CAVIUM_OCTEON2:
 192         case CPU_JZRISC:
 193         case CPU_LOONGSON1:
 194         case CPU_XLR:
 195         case CPU_XLP:
 196                 cpu_wait = r4k_wait;
 197                 break;
 198
 199         case CPU_RM7000:
 200                 cpu_wait = rm7k_wait_irqoff;
 201                 break;
 202
 203         case CPU_M14KC:
 204         case CPU_24K:
 205         case CPU_34K:
 206         case CPU_1004K:
 207                 cpu_wait = r4k_wait;
 208                 if (read_c0_config7() & MIPS_CONF7_WII)
 209                         cpu_wait = r4k_wait_irqoff;
 210                 break;
 211
 212         case CPU_74K:
 213                 cpu_wait = r4k_wait;
 214                 if ((c->processor_id & 0xff) >= PRID_REV_ENCODE_332(2, 1, 0))
 215                         cpu_wait = r4k_wait_irqoff;
 216                 break;
 217
 218         case CPU_TX49XX:
 219                 cpu_wait = r4k_wait_irqoff;
 220                 break;
 221         case CPU_ALCHEMY:
 222                 cpu_wait = au1k_wait;
 223                 break;
 224         case CPU_20KC:
 225                 /*
 226                  * WAIT on Rev1.0 has E1, E2, E3 and E16.
 227                  * WAIT on Rev2.0 and Rev3.0 has E16.
 228                  * Rev3.1 WAIT is nop, why bother
 229                  */
 230                 if ((c->processor_id & 0xff) <= 0x64)
 231                         break;
 232
 233                 /*
 234                  * Another rev is incremeting c0_count at a reduced clock
 235                  * rate while in WAIT mode.  So we basically have the choice
 236                  * between using the cp0 timer as clocksource or avoiding
 237                  * the WAIT instruction.  Until more details are known,
 238                  * disable the use of WAIT for 20Kc entirely.
 239                    cpu_wait = r4k_wait;
 240                  */
 241                 break;
 242         case CPU_RM9000:
 243                 if ((c->processor_id & 0x00ff) >= 0x40)
 244                         cpu_wait = r4k_wait;
 245                 break;
 246         default:
 247                 break;
 248         }
 249 }
 250
 251 static inline void check_errata(void)
 252 {
 253         struct cpuinfo_mips *c = &current_cpu_data;
 254
 255         switch (c->cputype) {
 256         case CPU_34K:
 257                 /*
 258                  * Erratum "RPS May Cause Incorrect Instruction Execution"
 259                  * This code only handles VPE0, any SMP/SMTC/RTOS code
 260                  * making use of VPE1 will be responsable for that VPE.
 261                  */
 262                 if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_34K_V1_0_2)
 263                         write_c0_config7(read_c0_config7() | MIPS_CONF7_RPS);
 264                 break;
 265         default:
 266                 break;
 267         }
 268 }
 269
 270 void __init check_bugs32(void)
 271 {
 272         check_errata();
 273 }
 274
 275 /*
 276  * Probe whether cpu has config register by trying to play with
 277  * alternate cache bit and see whether it matters.
 278  * It's used by cpu_probe to distinguish between R3000A and R3081.
 279  */
 280 static inline int cpu_has_confreg(void)
 281 {
 282 #ifdef CONFIG_CPU_R3000
 283         extern unsigned long r3k_cache_size(unsigned long);
 284         unsigned long size1, size2;
 285         unsigned long cfg = read_c0_conf();
 286
 287         size1 = r3k_cache_size(ST0_ISC);
 288         write_c0_conf(cfg ^ R30XX_CONF_AC);
 289         size2 = r3k_cache_size(ST0_ISC);
 290         write_c0_conf(cfg);
 291         return size1 != size2;
 292 #else
 293         return 0;
 294 #endif
 295 }
 296
 297 static inline void set_elf_platform(int cpu, const char *plat)
 298 {
 299         if (cpu == 0)
 300                 __elf_platform = plat;
 301 }
 302
 303 /*
 304  * Get the FPU Implementation/Revision.
 305  */
 306 static inline unsigned long cpu_get_fpu_id(void)
 307 {
 308         unsigned long tmp, fpu_id;
 309
 310         tmp = read_c0_status();
 311         __enable_fpu();
 312         fpu_id = read_32bit_cp1_register(CP1_REVISION);
 313         write_c0_status(tmp);
 314         return fpu_id;
 315 }
 316
 317 /*
 318  * Check the CPU has an FPU the official way.
 319  */
 320 static inline int __cpu_has_fpu(void)
 321 {
 322         return ((cpu_get_fpu_id() & 0xff00) != FPIR_IMP_NONE);
 323 }
 324
 325 static inline void cpu_probe_vmbits(struct cpuinfo_mips *c)
 326 {
 327 #ifdef __NEED_VMBITS_PROBE
 328         write_c0_entryhi(0x3fffffffffffe000ULL);
 329         back_to_back_c0_hazard();
 330         c->vmbits = fls64(read_c0_entryhi() & 0x3fffffffffffe000ULL);
 331 #endif
 332 }
 333
 334 static char unknown_isa[] __cpuinitdata = KERN_ERR \
 335         "Unsupported ISA type, c0.config0: %d.";
 336
 337 static inline unsigned int decode_config0(struct cpuinfo_mips *c)
 338 {
 339         unsigned int config0;
 340         int isa;
 341
 342         config0 = read_c0_config();
 343
 344         if (((config0 & MIPS_CONF_MT) >> 7) == 1)
 345                 c->options |= MIPS_CPU_TLB;
 346         isa = (config0 & MIPS_CONF_AT) >> 13;
 347         switch (isa) {
 348         case 0:
 349                 switch ((config0 & MIPS_CONF_AR) >> 10) {
 350                 case 0:
 351                         c->isa_level = MIPS_CPU_ISA_M32R1;
 352                         break;
 353                 case 1:
 354                         c->isa_level = MIPS_CPU_ISA_M32R2;
 355                         break;
 356                 default:
 357                         goto unknown;
 358                 }
 359                 break;
 360         case 2:
 361                 switch ((config0 & MIPS_CONF_AR) >> 10) {
 362                 case 0:
 363                         c->isa_level = MIPS_CPU_ISA_M64R1;
 364                         break;
 365                 case 1:
 366                         c->isa_level = MIPS_CPU_ISA_M64R2;
 367                         break;
 368                 default:
 369                         goto unknown;
 370                 }
 371                 break;
 372         default:
 373                 goto unknown;
 374         }
 375
 376         return config0 & MIPS_CONF_M;
 377
 378 unknown:
 379         panic(unknown_isa, config0);
 380 }
 381
 382 static inline unsigned int decode_config1(struct cpuinfo_mips *c)
 383 {
 384         unsigned int config1;
 385
 386         config1 = read_c0_config1();
 387
 388         if (config1 & MIPS_CONF1_MD)
 389                 c->ases |= MIPS_ASE_MDMX;
 390         if (config1 & MIPS_CONF1_WR)
 391                 c->options |= MIPS_CPU_WATCH;
 392         if (config1 & MIPS_CONF1_CA)
 393                 c->ases |= MIPS_ASE_MIPS16;
 394         if (config1 & MIPS_CONF1_EP)
 395                 c->options |= MIPS_CPU_EJTAG;
 396         if (config1 & MIPS_CONF1_FP) {
 397                 c->options |= MIPS_CPU_FPU;
 398                 c->options |= MIPS_CPU_32FPR;
 399         }
 400         if (cpu_has_tlb)
 401                 c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1;
 402
 403         return config1 & MIPS_CONF_M;
 404 }
 405
 406 static inline unsigned int decode_config2(struct cpuinfo_mips *c)
 407 {
 408         unsigned int config2;
 409
 410         config2 = read_c0_config2();
 411
 412         if (config2 & MIPS_CONF2_SL)
 413                 c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
 414
 415         return config2 & MIPS_CONF_M;
 416 }
 417
 418 static inline unsigned int decode_config3(struct cpuinfo_mips *c)
 419 {
 420         unsigned int config3;
 421
 422         config3 = read_c0_config3();
 423
 424         if (config3 & MIPS_CONF3_SM) {
 425                 c->ases |= MIPS_ASE_SMARTMIPS;
 426                 c->options |= MIPS_CPU_RIXI;
 427         }
 428         if (config3 & MIPS_CONF3_RXI)
 429                 c->options |= MIPS_CPU_RIXI;
 430         if (config3 & MIPS_CONF3_DSP)
 431                 c->ases |= MIPS_ASE_DSP;
 432         if (config3 & MIPS_CONF3_DSP2P)
 433                 c->ases |= MIPS_ASE_DSP2P;
 434         if (config3 & MIPS_CONF3_VINT)
 435                 c->options |= MIPS_CPU_VINT;
 436         if (config3 & MIPS_CONF3_VEIC)
 437                 c->options |= MIPS_CPU_VEIC;
 438         if (config3 & MIPS_CONF3_MT)
 439                 c->ases |= MIPS_ASE_MIPSMT;
 440         if (config3 & MIPS_CONF3_ULRI)
 441                 c->options |= MIPS_CPU_ULRI;
 442
 443         return config3 & MIPS_CONF_M;
 444 }
 445
 446 static inline unsigned int decode_config4(struct cpuinfo_mips *c)
 447 {
 448         unsigned int config4;
 449
 450         config4 = read_c0_config4();
 451
 452         if ((config4 & MIPS_CONF4_MMUEXTDEF) == MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT
 453             && cpu_has_tlb)
 454                 c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40;
 455
 456         c->kscratch_mask = (config4 >> 16) & 0xff;
 457
 458         return config4 & MIPS_CONF_M;
 459 }
 460
 461 static void __cpuinit decode_configs(struct cpuinfo_mips *c)
 462 {
 463         int ok;
 464
 465         /* MIPS32 or MIPS64 compliant CPU.  */
 466         c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER |
 467                      MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK;
 468
 469         c->scache.flags = MIPS_CACHE_NOT_PRESENT;
 470
 471         ok = decode_config0(c);                 /* Read Config registers.  */
 472         BUG_ON(!ok);                            /* Arch spec violation!  */
 473         if (ok)
 474                 ok = decode_config1(c);
 475         if (ok)
 476                 ok = decode_config2(c);
 477         if (ok)
 478                 ok = decode_config3(c);
 479         if (ok)
 480                 ok = decode_config4(c);
 481
 482         mips_probe_watch_registers(c);
 483
 484         if (cpu_has_mips_r2)
 485                 c->core = read_c0_ebase() & 0x3ff;
 486 }
 487
 488 #define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \
 489                 | MIPS_CPU_COUNTER)
 490
 491 static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
 492 {
 493         switch (c->processor_id & 0xff00) {
 494         case PRID_IMP_R2000:
 495                 c->cputype = CPU_R2000;
 496                 __cpu_name[cpu] = "R2000";
 497                 c->isa_level = MIPS_CPU_ISA_I;
 498                 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
 499                              MIPS_CPU_NOFPUEX;
 500                 if (__cpu_has_fpu())
 501                         c->options |= MIPS_CPU_FPU;
 502                 c->tlbsize = 64;
 503                 break;
 504         case PRID_IMP_R3000:
 505                 if ((c->processor_id & 0xff) == PRID_REV_R3000A) {
 506                         if (cpu_has_confreg()) {
 507                                 c->cputype = CPU_R3081E;
 508                                 __cpu_name[cpu] = "R3081";
 509                         } else {
 510                                 c->cputype = CPU_R3000A;
 511                                 __cpu_name[cpu] = "R3000A";
 512                         }
 513                         break;
 514                 } else {
 515                         c->cputype = CPU_R3000;
 516                         __cpu_name[cpu] = "R3000";
 517                 }
 518                 c->isa_level = MIPS_CPU_ISA_I;
 519                 c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
 520                              MIPS_CPU_NOFPUEX;
 521                 if (__cpu_has_fpu())
 522                         c->options |= MIPS_CPU_FPU;
 523                 c->tlbsize = 64;
 524                 break;
 525         case PRID_IMP_R4000:
 526                 if (read_c0_config() & CONF_SC) {
 527                         if ((c->processor_id & 0xff) >= PRID_REV_R4400) {
 528                                 c->cputype = CPU_R4400PC;
 529                                 __cpu_name[cpu] = "R4400PC";
 530                         } else {
 531                                 c->cputype = CPU_R4000PC;
 532                                 __cpu_name[cpu] = "R4000PC";
 533                         }
 534                 } else {
 535                         if ((c->processor_id & 0xff) >= PRID_REV_R4400) {
 536                                 c->cputype = CPU_R4400SC;
 537                                 __cpu_name[cpu] = "R4400SC";
 538                         } else {
 539                                 c->cputype = CPU_R4000SC;
 540                                 __cpu_name[cpu] = "R4000SC";
 541                         }
 542                 }
 543
 544                 c->isa_level = MIPS_CPU_ISA_III;
 545                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
 546                              MIPS_CPU_WATCH | MIPS_CPU_VCE |
 547                              MIPS_CPU_LLSC;
 548                 c->tlbsize = 48;
 549                 break;
 550         case PRID_IMP_VR41XX:
 551                 switch (c->processor_id & 0xf0) {
 552                 case PRID_REV_VR4111:
 553                         c->cputype = CPU_VR4111;
 554                         __cpu_name[cpu] = "NEC VR4111";
 555                         break;
 556                 case PRID_REV_VR4121:
 557                         c->cputype = CPU_VR4121;
 558                         __cpu_name[cpu] = "NEC VR4121";
 559                         break;
 560                 case PRID_REV_VR4122:
 561                         if ((c->processor_id & 0xf) < 0x3) {
 562                                 c->cputype = CPU_VR4122;
 563                                 __cpu_name[cpu] = "NEC VR4122";
 564                         } else {
 565                                 c->cputype = CPU_VR4181A;
 566                                 __cpu_name[cpu] = "NEC VR4181A";
 567                         }
 568                         break;
 569                 case PRID_REV_VR4130:
 570                         if ((c->processor_id & 0xf) < 0x4) {
 571                                 c->cputype = CPU_VR4131;
 572                                 __cpu_name[cpu] = "NEC VR4131";
 573                         } else {
 574                                 c->cputype = CPU_VR4133;
 575                                 __cpu_name[cpu] = "NEC VR4133";
 576                         }
 577                         break;
 578                 default:
 579                         printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n");
 580                         c->cputype = CPU_VR41XX;
 581                         __cpu_name[cpu] = "NEC Vr41xx";
 582                         break;
 583                 }
 584                 c->isa_level = MIPS_CPU_ISA_III;
 585                 c->options = R4K_OPTS;
 586                 c->tlbsize = 32;
 587                 break;
 588         case PRID_IMP_R4300:
 589                 c->cputype = CPU_R4300;
 590                 __cpu_name[cpu] = "R4300";
 591                 c->isa_level = MIPS_CPU_ISA_III;
 592                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
 593                              MIPS_CPU_LLSC;
 594                 c->tlbsize = 32;
 595                 break;
 596         case PRID_IMP_R4600:
 597                 c->cputype = CPU_R4600;
 598                 __cpu_name[cpu] = "R4600";
 599                 c->isa_level = MIPS_CPU_ISA_III;
 600                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
 601                              MIPS_CPU_LLSC;
 602                 c->tlbsize = 48;
 603                 break;
 604         #if 0
 605         case PRID_IMP_R4650:
 606                 /*
 607                  * This processor doesn't have an MMU, so it's not
 608                  * "real easy" to run Linux on it. It is left purely
 609                  * for documentation.  Commented out because it shares
 610                  * it's c0_prid id number with the TX3900.
 611                  */
 612                 c->cputype = CPU_R4650;
 613                 __cpu_name[cpu] = "R4650";
 614                 c->isa_level = MIPS_CPU_ISA_III;
 615                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
 616                 c->tlbsize = 48;
 617                 break;
 618         #endif
 619         case PRID_IMP_TX39:
 620                 c->isa_level = MIPS_CPU_ISA_I;
 621                 c->options = MIPS_CPU_TLB | MIPS_CPU_TX39_CACHE;
 622
 623                 if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) {
 624                         c->cputype = CPU_TX3927;
 625                         __cpu_name[cpu] = "TX3927";
 626                         c->tlbsize = 64;
 627                 } else {
 628                         switch (c->processor_id & 0xff) {
 629                         case PRID_REV_TX3912:
 630                                 c->cputype = CPU_TX3912;
 631                                 __cpu_name[cpu] = "TX3912";
 632                                 c->tlbsize = 32;
 633                                 break;
 634                         case PRID_REV_TX3922:
 635                                 c->cputype = CPU_TX3922;
 636                                 __cpu_name[cpu] = "TX3922";
 637                                 c->tlbsize = 64;
 638                                 break;
 639                         }
 640                 }
 641                 break;
 642         case PRID_IMP_R4700:
 643                 c->cputype = CPU_R4700;
 644                 __cpu_name[cpu] = "R4700";
 645                 c->isa_level = MIPS_CPU_ISA_III;
 646                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
 647                              MIPS_CPU_LLSC;
 648                 c->tlbsize = 48;
 649                 break;
 650         case PRID_IMP_TX49:
 651                 c->cputype = CPU_TX49XX;
 652                 __cpu_name[cpu] = "R49XX";
 653                 c->isa_level = MIPS_CPU_ISA_III;
 654                 c->options = R4K_OPTS | MIPS_CPU_LLSC;
 655                 if (!(c->processor_id & 0x08))
 656                         c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR;
 657                 c->tlbsize = 48;
 658                 break;
 659         case PRID_IMP_R5000:
 660                 c->cputype = CPU_R5000;
 661                 __cpu_name[cpu] = "R5000";
 662                 c->isa_level = MIPS_CPU_ISA_IV;
 663                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
 664                              MIPS_CPU_LLSC;
 665                 c->tlbsize = 48;
 666                 break;
 667         case PRID_IMP_R5432:
 668                 c->cputype = CPU_R5432;
 669                 __cpu_name[cpu] = "R5432";
 670                 c->isa_level = MIPS_CPU_ISA_IV;
 671                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
 672                              MIPS_CPU_WATCH | MIPS_CPU_LLSC;
 673                 c->tlbsize = 48;
 674                 break;
 675         case PRID_IMP_R5500:
 676                 c->cputype = CPU_R5500;
 677                 __cpu_name[cpu] = "R5500";
 678                 c->isa_level = MIPS_CPU_ISA_IV;
 679                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
 680                              MIPS_CPU_WATCH | MIPS_CPU_LLSC;
 681                 c->tlbsize = 48;
 682                 break;
 683         case PRID_IMP_NEVADA:
 684                 c->cputype = CPU_NEVADA;
 685                 __cpu_name[cpu] = "Nevada";
 686                 c->isa_level = MIPS_CPU_ISA_IV;
 687                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
 688                              MIPS_CPU_DIVEC | MIPS_CPU_LLSC;
 689                 c->tlbsize = 48;
 690                 break;
 691         case PRID_IMP_R6000:
 692                 c->cputype = CPU_R6000;
 693                 __cpu_name[cpu] = "R6000";
 694                 c->isa_level = MIPS_CPU_ISA_II;
 695                 c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
 696                              MIPS_CPU_LLSC;
 697                 c->tlbsize = 32;
 698                 break;
 699         case PRID_IMP_R6000A:
 700                 c->cputype = CPU_R6000A;
 701                 __cpu_name[cpu] = "R6000A";
 702                 c->isa_level = MIPS_CPU_ISA_II;
 703                 c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
 704                              MIPS_CPU_LLSC;
 705                 c->tlbsize = 32;
 706                 break;
 707         case PRID_IMP_RM7000:
 708                 c->cputype = CPU_RM7000;
 709                 __cpu_name[cpu] = "RM7000";
 710                 c->isa_level = MIPS_CPU_ISA_IV;
 711                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
 712                              MIPS_CPU_LLSC;
 713                 /*
 714                  * Undocumented RM7000:  Bit 29 in the info register of
 715                  * the RM7000 v2.0 indicates if the TLB has 48 or 64
 716                  * entries.
 717                  *
 718                  * 29      1 =>    64 entry JTLB
 719                  *         0 =>    48 entry JTLB
 720                  */
 721                 c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
 722                 break;
 723         case PRID_IMP_RM9000:
 724                 c->cputype = CPU_RM9000;
 725                 __cpu_name[cpu] = "RM9000";
 726                 c->isa_level = MIPS_CPU_ISA_IV;
 727                 c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
 728                              MIPS_CPU_LLSC;
 729                 /*
 730                  * Bit 29 in the info register of the RM9000
 731                  * indicates if the TLB has 48 or 64 entries.
 732                  *
 733                  * 29      1 =>    64 entry JTLB
 734                  *         0 =>    48 entry JTLB
 735                  */
 736                 c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
 737                 break;
 738         case PRID_IMP_R8000:
 739                 c->cputype = CPU_R8000;
 740                 __cpu_name[cpu] = "RM8000";
 741                 c->isa_level = MIPS_CPU_ISA_IV;
 742                 c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
 743                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
 744                              MIPS_CPU_LLSC;
 745                 c->tlbsize = 384;      /* has weird TLB: 3-way x 128 */
 746                 break;
 747         case PRID_IMP_R10000:
 748                 c->cputype = CPU_R10000;
 749                 __cpu_name[cpu] = "R10000";
 750                 c->isa_level = MIPS_CPU_ISA_IV;
 751                 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
 752                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
 753                              MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
 754                              MIPS_CPU_LLSC;
 755                 c->tlbsize = 64;
 756                 break;
 757         case PRID_IMP_R12000:
 758                 c->cputype = CPU_R12000;
 759                 __cpu_name[cpu] = "R12000";
 760                 c->isa_level = MIPS_CPU_ISA_IV;
 761                 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
 762                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
 763                              MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
 764                              MIPS_CPU_LLSC;
 765                 c->tlbsize = 64;
 766                 break;
 767         case PRID_IMP_R14000:
 768                 c->cputype = CPU_R14000;
 769                 __cpu_name[cpu] = "R14000";
 770                 c->isa_level = MIPS_CPU_ISA_IV;
 771                 c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
 772                              MIPS_CPU_FPU | MIPS_CPU_32FPR |
 773                              MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
 774                              MIPS_CPU_LLSC;
 775                 c->tlbsize = 64;
 776                 break;
 777         case PRID_IMP_LOONGSON2:
 778                 c->cputype = CPU_LOONGSON2;
 779                 __cpu_name[cpu] = "ICT Loongson-2";
 780
 781                 switch (c->processor_id & PRID_REV_MASK) {
 782                 case PRID_REV_LOONGSON2E:
 783                         set_elf_platform(cpu, "loongson2e");
 784                         break;
 785                 case PRID_REV_LOONGSON2F:
 786                         set_elf_platform(cpu, "loongson2f");
 787                         break;
 788                 }
 789
 790                 c->isa_level = MIPS_CPU_ISA_III;
 791                 c->options = R4K_OPTS |
 792                              MIPS_CPU_FPU | MIPS_CPU_LLSC |
 793                              MIPS_CPU_32FPR;
 794                 c->tlbsize = 64;
 795                 break;
 796         case PRID_IMP_LOONGSON1:
 797                 decode_configs(c);
 798
 799                 c->cputype = CPU_LOONGSON1;
 800
 801                 switch (c->processor_id & PRID_REV_MASK) {
 802                 case PRID_REV_LOONGSON1B:
 803                         __cpu_name[cpu] = "Loongson 1B";
 804                         break;
 805                 }
 806
 807                 break;
 808         }
 809 }
 810
 811 static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
 812 {
 813         decode_configs(c);
 814         switch (c->processor_id & 0xff00) {
 815         case PRID_IMP_4KC:
 816                 c->cputype = CPU_4KC;
 817                 __cpu_name[cpu] = "MIPS 4Kc";
 818                 break;
 819         case PRID_IMP_4KEC:
 820         case PRID_IMP_4KECR2:
 821                 c->cputype = CPU_4KEC;
 822                 __cpu_name[cpu] = "MIPS 4KEc";
 823                 break;
 824         case PRID_IMP_4KSC:
 825         case PRID_IMP_4KSD:
 826                 c->cputype = CPU_4KSC;
 827                 __cpu_name[cpu] = "MIPS 4KSc";
 828                 break;
 829         case PRID_IMP_5KC:
 830                 c->cputype = CPU_5KC;
 831                 __cpu_name[cpu] = "MIPS 5Kc";
 832                 break;
 833         case PRID_IMP_5KE:
 834                 c->cputype = CPU_5KE;
 835                 __cpu_name[cpu] = "MIPS 5KE";
 836                 break;
 837         case PRID_IMP_20KC:
 838                 c->cputype = CPU_20KC;
 839                 __cpu_name[cpu] = "MIPS 20Kc";
 840                 break;
 841         case PRID_IMP_24K:
 842         case PRID_IMP_24KE:
 843                 c->cputype = CPU_24K;
 844                 __cpu_name[cpu] = "MIPS 24Kc";
 845                 break;
 846         case PRID_IMP_25KF:
 847                 c->cputype = CPU_25KF;
 848                 __cpu_name[cpu] = "MIPS 25Kc";
 849                 break;
 850         case PRID_IMP_34K:
 851                 c->cputype = CPU_34K;
 852                 __cpu_name[cpu] = "MIPS 34Kc";
 853                 break;
 854         case PRID_IMP_74K:
 855                 c->cputype = CPU_74K;
 856                 __cpu_name[cpu] = "MIPS 74Kc";
 857                 break;
 858         case PRID_IMP_M14KC:
 859                 c->cputype = CPU_M14KC;
 860                 __cpu_name[cpu] = "MIPS M14Kc";
 861                 break;
 862         case PRID_IMP_1004K:
 863                 c->cputype = CPU_1004K;
 864                 __cpu_name[cpu] = "MIPS 1004Kc";
 865                 break;
 866         case PRID_IMP_1074K:
 867                 c->cputype = CPU_74K;
 868                 __cpu_name[cpu] = "MIPS 1074Kc";
 869                 break;
 870         }
 871
 872         spram_config();
 873 }
 874
 875 static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
 876 {
 877         decode_configs(c);
 878         switch (c->processor_id & 0xff00) {
 879         case PRID_IMP_AU1_REV1:
 880         case PRID_IMP_AU1_REV2:
 881                 c->cputype = CPU_ALCHEMY;
 882                 switch ((c->processor_id >> 24) & 0xff) {
 883                 case 0:
 884                         __cpu_name[cpu] = "Au1000";
 885                         break;
 886                 case 1:
 887                         __cpu_name[cpu] = "Au1500";
 888                         break;
 889                 case 2:
 890                         __cpu_name[cpu] = "Au1100";
 891                         break;
 892                 case 3:
 893                         __cpu_name[cpu] = "Au1550";
 894                         break;
 895                 case 4:
 896                         __cpu_name[cpu] = "Au1200";
 897                         if ((c->processor_id & 0xff) == 2)
 898                                 __cpu_name[cpu] = "Au1250";
 899                         break;
 900                 case 5:
 901                         __cpu_name[cpu] = "Au1210";
 902                         break;
 903                 default:
 904                         __cpu_name[cpu] = "Au1xxx";
 905                         break;
 906                 }
 907                 break;
 908         }
 909 }
 910
 911 static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu)
 912 {
 913         decode_configs(c);
 914
 915         switch (c->processor_id & 0xff00) {
 916         case PRID_IMP_SB1:
 917                 c->cputype = CPU_SB1;
 918                 __cpu_name[cpu] = "SiByte SB1";
 919                 /* FPU in pass1 is known to have issues. */
 920                 if ((c->processor_id & 0xff) < 0x02)
 921                         c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR);
 922                 break;
 923         case PRID_IMP_SB1A:
 924                 c->cputype = CPU_SB1A;
 925                 __cpu_name[cpu] = "SiByte SB1A";
 926                 break;
 927         }
 928 }
 929
 930 static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu)
 931 {
 932         decode_configs(c);
 933         switch (c->processor_id & 0xff00) {
 934         case PRID_IMP_SR71000:
 935                 c->cputype = CPU_SR71000;
 936                 __cpu_name[cpu] = "Sandcraft SR71000";
 937                 c->scache.ways = 8;
 938                 c->tlbsize = 64;
 939                 break;
 940         }
 941 }
 942
 943 static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu)
 944 {
 945         decode_configs(c);
 946         switch (c->processor_id & 0xff00) {
 947         case PRID_IMP_PR4450:
 948                 c->cputype = CPU_PR4450;
 949                 __cpu_name[cpu] = "Philips PR4450";
 950                 c->isa_level = MIPS_CPU_ISA_M32R1;
 951                 break;
 952         }
 953 }
 954
 955 static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
 956 {
 957         decode_configs(c);
 958         switch (c->processor_id & 0xff00) {
 959         case PRID_IMP_BMIPS32_REV4:
 960         case PRID_IMP_BMIPS32_REV8:
 961                 c->cputype = CPU_BMIPS32;
 962                 __cpu_name[cpu] = "Broadcom BMIPS32";
 963                 set_elf_platform(cpu, "bmips32");
 964                 break;
 965         case PRID_IMP_BMIPS3300:
 966         case PRID_IMP_BMIPS3300_ALT:
 967         case PRID_IMP_BMIPS3300_BUG:
 968                 c->cputype = CPU_BMIPS3300;
 969                 __cpu_name[cpu] = "Broadcom BMIPS3300";
 970                 set_elf_platform(cpu, "bmips3300");
 971                 break;
 972         case PRID_IMP_BMIPS43XX: {
 973                 int rev = c->processor_id & 0xff;
 974
 975                 if (rev >= PRID_REV_BMIPS4380_LO &&
 976                                 rev <= PRID_REV_BMIPS4380_HI) {
 977                         c->cputype = CPU_BMIPS4380;
 978                         __cpu_name[cpu] = "Broadcom BMIPS4380";
 979                         set_elf_platform(cpu, "bmips4380");
 980                 } else {
 981                         c->cputype = CPU_BMIPS4350;
 982                         __cpu_name[cpu] = "Broadcom BMIPS4350";
 983                         set_elf_platform(cpu, "bmips4350");
 984                 }
 985                 break;
 986         }
 987         case PRID_IMP_BMIPS5000:
 988                 c->cputype = CPU_BMIPS5000;
 989                 __cpu_name[cpu] = "Broadcom BMIPS5000";
 990                 set_elf_platform(cpu, "bmips5000");
 991                 c->options |= MIPS_CPU_ULRI;
 992                 break;
 993         }
 994 }
 995
 996 static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
 997 {
 998         decode_configs(c);
 999         switch (c->processor_id & 0xff00) {
1000         case PRID_IMP_CAVIUM_CN38XX:
1001         case PRID_IMP_CAVIUM_CN31XX:
1002         case PRID_IMP_CAVIUM_CN30XX:
1003                 c->cputype = CPU_CAVIUM_OCTEON;
1004                 __cpu_name[cpu] = "Cavium Octeon";
1005                 goto platform;
1006         case PRID_IMP_CAVIUM_CN58XX:
1007         case PRID_IMP_CAVIUM_CN56XX:
1008         case PRID_IMP_CAVIUM_CN50XX:
1009         case PRID_IMP_CAVIUM_CN52XX:
1010                 c->cputype = CPU_CAVIUM_OCTEON_PLUS;
1011                 __cpu_name[cpu] = "Cavium Octeon+";
1012 platform:
1013                 set_elf_platform(cpu, "octeon");
1014                 break;
1015         case PRID_IMP_CAVIUM_CN61XX:
1016         case PRID_IMP_CAVIUM_CN63XX:
1017         case PRID_IMP_CAVIUM_CN66XX:
1018         case PRID_IMP_CAVIUM_CN68XX:
1019                 c->cputype = CPU_CAVIUM_OCTEON2;
1020                 __cpu_name[cpu] = "Cavium Octeon II";
1021                 set_elf_platform(cpu, "octeon2");
1022                 break;
1023         default:
1024                 printk(KERN_INFO "Unknown Octeon chip!\n");
1025                 c->cputype = CPU_UNKNOWN;
1026                 break;
1027         }
1028 }
1029
1030 static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu)
1031 {
1032         decode_configs(c);
1033         /* JZRISC does not implement the CP0 counter. */
1034         c->options &= ~MIPS_CPU_COUNTER;
1035         switch (c->processor_id & 0xff00) {
1036         case PRID_IMP_JZRISC:
1037                 c->cputype = CPU_JZRISC;
1038                 __cpu_name[cpu] = "Ingenic JZRISC";
1039                 break;
1040         default:
1041                 panic("Unknown Ingenic Processor ID!");
1042                 break;
1043         }
1044 }
1045
1046 static inline void cpu_probe_netlogic(struct cpuinfo_mips *c, int cpu)
1047 {
1048         decode_configs(c);
1049
1050         if ((c->processor_id & 0xff00) == PRID_IMP_NETLOGIC_AU13XX) {
1051                 c->cputype = CPU_ALCHEMY;
1052                 __cpu_name[cpu] = "Au1300";
1053                 /* following stuff is not for Alchemy */
1054                 return;
1055         }
1056
1057         c->options = (MIPS_CPU_TLB       |
1058                         MIPS_CPU_4KEX    |
1059                         MIPS_CPU_COUNTER |
1060                         MIPS_CPU_DIVEC   |
1061                         MIPS_CPU_WATCH   |
1062                         MIPS_CPU_EJTAG   |
1063                         MIPS_CPU_LLSC);
1064
1065         switch (c->processor_id & 0xff00) {
1066         case PRID_IMP_NETLOGIC_XLP8XX:
1067         case PRID_IMP_NETLOGIC_XLP3XX:
1068                 c->cputype = CPU_XLP;
1069                 __cpu_name[cpu] = "Netlogic XLP";
1070                 break;
1071
1072         case PRID_IMP_NETLOGIC_XLR732:
1073         case PRID_IMP_NETLOGIC_XLR716:
1074         case PRID_IMP_NETLOGIC_XLR532:
1075         case PRID_IMP_NETLOGIC_XLR308:
1076         case PRID_IMP_NETLOGIC_XLR532C:
1077         case PRID_IMP_NETLOGIC_XLR516C:
1078         case PRID_IMP_NETLOGIC_XLR508C:
1079         case PRID_IMP_NETLOGIC_XLR308C:
1080                 c->cputype = CPU_XLR;
1081                 __cpu_name[cpu] = "Netlogic XLR";
1082                 break;
1083
1084         case PRID_IMP_NETLOGIC_XLS608:
1085         case PRID_IMP_NETLOGIC_XLS408:
1086         case PRID_IMP_NETLOGIC_XLS404:
1087         case PRID_IMP_NETLOGIC_XLS208:
1088         case PRID_IMP_NETLOGIC_XLS204:
1089         case PRID_IMP_NETLOGIC_XLS108:
1090         case PRID_IMP_NETLOGIC_XLS104:
1091         case PRID_IMP_NETLOGIC_XLS616B:
1092         case PRID_IMP_NETLOGIC_XLS608B:
1093         case PRID_IMP_NETLOGIC_XLS416B:
1094         case PRID_IMP_NETLOGIC_XLS412B:
1095         case PRID_IMP_NETLOGIC_XLS408B:
1096         case PRID_IMP_NETLOGIC_XLS404B:
1097                 c->cputype = CPU_XLR;
1098                 __cpu_name[cpu] = "Netlogic XLS";
1099                 break;
1100
1101         default:
1102                 pr_info("Unknown Netlogic chip id [%02x]!\n",
1103                        c->processor_id);
1104                 c->cputype = CPU_XLR;
1105                 break;
1106         }
1107
1108         if (c->cputype == CPU_XLP) {
1109                 c->isa_level = MIPS_CPU_ISA_M64R2;
1110                 c->options |= (MIPS_CPU_FPU | MIPS_CPU_ULRI | MIPS_CPU_MCHECK);
1111                 /* This will be updated again after all threads are woken up */
1112                 c->tlbsize = ((read_c0_config6() >> 16) & 0xffff) + 1;
1113         } else {
1114                 c->isa_level = MIPS_CPU_ISA_M64R1;
1115                 c->tlbsize = ((read_c0_config1() >> 25) & 0x3f) + 1;
1116         }
1117 }
1118
1119 #ifdef CONFIG_64BIT
1120 /* For use by uaccess.h */
1121 u64 __ua_limit;
1122 EXPORT_SYMBOL(__ua_limit);
1123 #endif
1124
1125 const char *__cpu_name[NR_CPUS];
1126 const char *__elf_platform;
1127
1128 __cpuinit void cpu_probe(void)
1129 {
1130         struct cpuinfo_mips *c = &current_cpu_data;
1131         unsigned int cpu = smp_processor_id();
1132
1133         c->processor_id = PRID_IMP_UNKNOWN;
1134         c->fpu_id       = FPIR_IMP_NONE;
1135         c->cputype      = CPU_UNKNOWN;
1136
1137         c->processor_id = read_c0_prid();
1138         switch (c->processor_id & 0xff0000) {
1139         case PRID_COMP_LEGACY:
1140                 cpu_probe_legacy(c, cpu);
1141                 break;
1142         case PRID_COMP_MIPS:
1143                 cpu_probe_mips(c, cpu);
1144                 break;
1145         case PRID_COMP_ALCHEMY:
1146                 cpu_probe_alchemy(c, cpu);
1147                 break;
1148         case PRID_COMP_SIBYTE:
1149                 cpu_probe_sibyte(c, cpu);
1150                 break;
1151         case PRID_COMP_BROADCOM:
1152                 cpu_probe_broadcom(c, cpu);
1153                 break;
1154         case PRID_COMP_SANDCRAFT:
1155                 cpu_probe_sandcraft(c, cpu);
1156                 break;
1157         case PRID_COMP_NXP:
1158                 cpu_probe_nxp(c, cpu);
1159                 break;
1160         case PRID_COMP_CAVIUM:
1161                 cpu_probe_cavium(c, cpu);
1162                 break;
1163         case PRID_COMP_INGENIC:
1164                 cpu_probe_ingenic(c, cpu);
1165                 break;
1166         case PRID_COMP_NETLOGIC:
1167                 cpu_probe_netlogic(c, cpu);
1168                 break;
1169         }
1170
1171         BUG_ON(!__cpu_name[cpu]);
1172         BUG_ON(c->cputype == CPU_UNKNOWN);
1173
1174         /*
1175          * Platform code can force the cpu type to optimize code
1176          * generation. In that case be sure the cpu type is correctly
1177          * manually setup otherwise it could trigger some nasty bugs.
1178          */
1179         BUG_ON(current_cpu_type() != c->cputype);
1180
1181         if (mips_fpu_disabled)
1182                 c->options &= ~MIPS_CPU_FPU;
1183
1184         if (mips_dsp_disabled)
1185                 c->ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P);
1186
1187         if (c->options & MIPS_CPU_FPU) {
1188                 c->fpu_id = cpu_get_fpu_id();
1189
1190                 if (c->isa_level == MIPS_CPU_ISA_M32R1 ||
1191                     c->isa_level == MIPS_CPU_ISA_M32R2 ||
1192                     c->isa_level == MIPS_CPU_ISA_M64R1 ||
1193                     c->isa_level == MIPS_CPU_ISA_M64R2) {
1194                         if (c->fpu_id & MIPS_FPIR_3D)
1195                                 c->ases |= MIPS_ASE_MIPS3D;
1196                 }
1197         }
1198
1199         if (cpu_has_mips_r2) {
1200                 c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
1201                 /* R2 has Performance Counter Interrupt indicator */
1202                 c->options |= MIPS_CPU_PCI;
1203         }
1204         else
1205                 c->srsets = 1;
1206
1207         cpu_probe_vmbits(c);
1208
1209 #ifdef CONFIG_64BIT
1210         if (cpu == 0)
1211                 __ua_limit = ~((1ull << cpu_vmbits) - 1);
1212 #endif
1213 }
1214
1215 __cpuinit void cpu_report(void)
1216 {
1217         struct cpuinfo_mips *c = &current_cpu_data;
1218
1219         printk(KERN_INFO "CPU revision is: %08x (%s)\n",
1220                c->processor_id, cpu_name_string());
1221         if (c->options & MIPS_CPU_FPU)
1222                 printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id);
1223 }