cpu.c revision 1.11
1 /* $NetBSD: cpu.c,v 1.11 2001/11/24 01:26:24 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Mark Brinicombe. 5 * Copyright (c) 1995 Brini. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Brini. 19 * 4. The name of the company nor the name of the author may be used to 20 * endorse or promote products derived from this software without specific 21 * prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * RiscBSD kernel project 36 * 37 * cpu.c 38 * 39 * Probing and configuration for the master cpu 40 * 41 * Created : 10/10/95 42 */ 43 44 #include "opt_armfpe.h" 45 #include "opt_cputypes.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/malloc.h> 50 #include <sys/device.h> 51 #include <sys/proc.h> 52 #include <uvm/uvm_extern.h> 53 #include <machine/conf.h> 54 #include <machine/cpu.h> 55 #include <arm/undefined.h> 56 57 #include <arm/cpus.h> 58 59 #ifdef ARMFPE 60 #include <machine/bootconfig.h> /* For boot args */ 61 #include <arm/fpe-arm/armfpe.h> 62 #endif 63 64 cpu_t cpus[MAX_CPUS]; 65 66 char cpu_model[64]; 67 volatile int undefined_test; /* Used for FPA test */ 68 extern int cpuctrl; /* cpu control register value */ 69 70 /* Prototypes */ 71 void identify_master_cpu __P((struct device *dv, int cpu_number)); 72 void identify_arm_cpu __P((struct device *dv, int cpu_number)); 73 void identify_arm_fpu __P((struct device *dv, int cpu_number)); 74 int fpa_test __P((u_int, u_int, trapframe_t *, int)); 75 int fpa_handler __P((u_int, u_int, trapframe_t *, int)); 76 77 /* 78 * void cpusattach(struct device *parent, struct device *dev, void *aux) 79 * 80 * Attach the main cpu 81 */ 82 83 void 84 cpu_attach(dv) 85 struct device *dv; 86 { 87 identify_master_cpu(dv, CPU_MASTER); 88 } 89 90 /* 91 * Used to test for an FPA. The following function is installed as a coproc1 92 * handler on the undefined instruction vector and then we issue a FPA 93 * instruction. If undefined_test is non zero then the FPA did not handle 94 * the instruction so must be absent. 95 */ 96 97 int 98 fpa_test(address, instruction, frame, fault_code) 99 u_int address; 100 u_int instruction; 101 trapframe_t *frame; 102 int fault_code; 103 { 104 105 frame->tf_pc += INSN_SIZE; 106 ++undefined_test; 107 return(0); 108 } 109 110 /* 111 * If an FPA was found then this function is installed as the coproc1 handler 112 * on the undefined instruction vector. Currently we don't support FPA's 113 * so this just triggers an exception. 114 */ 115 116 int 117 fpa_handler(address, instruction, frame, fault_code) 118 u_int address; 119 u_int instruction; 120 trapframe_t *frame; 121 int fault_code; 122 { 123 u_int fpsr; 124 125 __asm __volatile("stmfd sp!, {r0}; .word 0xee300110; mov %0, r0; ldmfd sp!, {r0}" : "=r" (fpsr)); 126 127 printf("FPA exception: fpsr = %08x\n", fpsr); 128 129 return(1); 130 } 131 132 133 /* 134 * Identify the master (boot) CPU 135 * This also probes for an FPU and will install an FPE if necessary 136 */ 137 138 void 139 identify_master_cpu(dv, cpu_number) 140 struct device *dv; 141 int cpu_number; 142 { 143 u_int fpsr; 144 void *uh; 145 146 cpus[cpu_number].cpu_ctrl = cpuctrl; 147 148 /* Get the cpu ID from coprocessor 15 */ 149 150 cpus[cpu_number].cpu_id = cpu_id(); 151 152 identify_arm_cpu(dv, cpu_number); 153 strcpy(cpu_model, cpus[cpu_number].cpu_model); 154 155 if (cpus[CPU_MASTER].cpu_class == CPU_CLASS_SA1 156 && (cpus[CPU_MASTER].cpu_id & CPU_ID_REVISION_MASK) < 3) { 157 printf("%s: SA-110 with bugged STM^ instruction\n", 158 dv->dv_xname); 159 } 160 161 #ifdef CPU_ARM8 162 if ((cpus[CPU_MASTER].cpu_id & CPU_ID_CPU_MASK) == CPU_ID_ARM810) { 163 int clock = arm8_clock_config(0, 0); 164 char *fclk; 165 printf("%s: ARM810 cp15=%02x", dv->dv_xname, clock); 166 printf(" clock:%s", (clock & 1) ? " dynamic" : ""); 167 printf("%s", (clock & 2) ? " sync" : ""); 168 switch ((clock >> 2) & 3) { 169 case 0 : 170 fclk = "bus clock"; 171 break; 172 case 1 : 173 fclk = "ref clock"; 174 break; 175 case 3 : 176 fclk = "pll"; 177 break; 178 default : 179 fclk = "illegal"; 180 break; 181 } 182 printf(" fclk source=%s\n", fclk); 183 } 184 #endif 185 186 /* 187 * Ok now we test for an FPA 188 * At this point no floating point emulator has been installed. 189 * This means any FP instruction will cause undefined exception. 190 * We install a temporay coproc 1 handler which will modify 191 * undefined_test if it is called. 192 * We then try to read the FP status register. If undefined_test 193 * has been decremented then the instruction was not handled by 194 * an FPA so we know the FPA is missing. If undefined_test is 195 * still 1 then we know the instruction was handled by an FPA. 196 * We then remove our test handler and look at the 197 * FP status register for identification. 198 */ 199 200 uh = install_coproc_handler(FP_COPROC, fpa_test); 201 202 undefined_test = 0; 203 204 __asm __volatile("stmfd sp!, {r0}; .word 0xee300110; mov %0, r0; ldmfd sp!, {r0}" : "=r" (fpsr)); 205 206 remove_coproc_handler(uh); 207 208 if (undefined_test == 0) { 209 cpus[cpu_number].fpu_type = (fpsr >> 24); 210 switch (fpsr >> 24) { 211 case 0x81 : 212 cpus[cpu_number].fpu_class = FPU_CLASS_FPA; 213 break; 214 215 default : 216 cpus[cpu_number].fpu_class = FPU_CLASS_FPU; 217 break; 218 } 219 cpus[cpu_number].fpu_flags = 0; 220 install_coproc_handler(FP_COPROC, fpa_handler); 221 } else { 222 cpus[cpu_number].fpu_class = FPU_CLASS_NONE; 223 cpus[cpu_number].fpu_flags = 0; 224 225 /* 226 * Ok if ARMFPE is defined and the boot options request the 227 * ARM FPE then it will be installed as the FPE. 228 * This is just while I work on integrating the new FPE. 229 * It means the new FPE gets installed if compiled int (ARMFPE 230 * defined) and also gives me a on/off option when I boot in 231 * case the new FPE is causing panics. 232 */ 233 234 #ifdef ARMFPE 235 if (boot_args) { 236 int usearmfpe = 1; 237 238 get_bootconf_option(boot_args, "armfpe", 239 BOOTOPT_TYPE_BOOLEAN, &usearmfpe); 240 if (usearmfpe) { 241 if (initialise_arm_fpe(&cpus[cpu_number]) != 0) 242 identify_arm_fpu(dv, cpu_number); 243 } 244 } 245 246 #endif 247 } 248 249 identify_arm_fpu(dv, cpu_number); 250 } 251 252 struct cpuidtab { 253 u_int32_t cpuid; 254 enum cpu_class cpu_class; 255 const char *cpu_name; 256 }; 257 258 const struct cpuidtab cpuids[] = { 259 { CPU_ID_ARM2, CPU_CLASS_ARM2, "ARM2" }, 260 { CPU_ID_ARM250, CPU_CLASS_ARM2AS, "ARM250" }, 261 { CPU_ID_ARM3, CPU_CLASS_ARM3, "ARM3" }, 262 { CPU_ID_ARM600, CPU_CLASS_ARM6, "ARM600" }, 263 { CPU_ID_ARM610, CPU_CLASS_ARM6, "ARM610" }, 264 { CPU_ID_ARM620, CPU_CLASS_ARM6, "ARM620" }, 265 { CPU_ID_ARM700, CPU_CLASS_ARM7, "ARM700" }, 266 { CPU_ID_ARM710, CPU_CLASS_ARM7, "ARM710" }, 267 { CPU_ID_ARM7500, CPU_CLASS_ARM7, "ARM7500" }, 268 { CPU_ID_ARM710A, CPU_CLASS_ARM7, "ARM710a" }, 269 { CPU_ID_ARM7500FE, CPU_CLASS_ARM7, "ARM7500FE" }, 270 { CPU_ID_ARM710T, CPU_CLASS_ARM7TDMI, "ARM710T" }, 271 { CPU_ID_ARM720T, CPU_CLASS_ARM7TDMI, "ARM720T" }, 272 { CPU_ID_ARM740T8K, CPU_CLASS_ARM7TDMI, "ARM740T (8 KB cache)" }, 273 { CPU_ID_ARM740T4K, CPU_CLASS_ARM7TDMI, "ARM740T (4 KB cache)" }, 274 { CPU_ID_ARM810, CPU_CLASS_ARM8, "ARM810" }, 275 { CPU_ID_ARM920T, CPU_CLASS_ARM9TDMI, "ARM920T" }, 276 { CPU_ID_ARM922T, CPU_CLASS_ARM9TDMI, "ARM922T" }, 277 { CPU_ID_ARM940T, CPU_CLASS_ARM9TDMI, "ARM940T" }, 278 { CPU_ID_ARM946ES, CPU_CLASS_ARM9ES, "ARM946E-S" }, 279 { CPU_ID_ARM966ES, CPU_CLASS_ARM9ES, "ARM966E-S" }, 280 { CPU_ID_ARM966ESR1, CPU_CLASS_ARM9ES, "ARM966E-S" }, 281 { CPU_ID_SA110, CPU_CLASS_SA1, "SA-110" }, 282 { CPU_ID_SA1100, CPU_CLASS_SA1, "SA-1100" }, 283 { CPU_ID_SA1110, CPU_CLASS_SA1, "SA-1110" }, 284 { CPU_ID_I80200, CPU_CLASS_XSCALE, "i80200" }, 285 { 0, CPU_CLASS_NONE, NULL } 286 }; 287 288 struct cpu_classtab { 289 const char *class_name; 290 const char *class_option; 291 }; 292 293 const struct cpu_classtab cpu_classes[] = { 294 { "unknown", NULL }, /* CPU_CLASS_NONE */ 295 { "ARM2", "CPU_ARM2" }, /* CPU_CLASS_ARM2 */ 296 { "ARM2as", "CPU_ARM250" }, /* CPU_CLASS_ARM2AS */ 297 { "ARM3", "CPU_ARM3" }, /* CPU_CLASS_ARM3 */ 298 { "ARM6", "CPU_ARM6" }, /* CPU_CLASS_ARM6 */ 299 { "ARM7", "CPU_ARM7" }, /* CPU_CLASS_ARM7 */ 300 { "ARM7TDMI", "CPU_ARM7TDMI" }, /* CPU_CLASS_ARM7TDMI */ 301 { "ARM8", "CPU_ARM8" }, /* CPU_CLASS_ARM8 */ 302 { "ARM9TDMI", NULL }, /* CPU_CLASS_ARM9TDMI */ 303 { "ARM9E-S", NULL }, /* CPU_CLASS_ARM9ES */ 304 { "SA-1", "CPU_SA110" }, /* CPU_CLASS_SA1 */ 305 { "XScale", "CPU_XSCALE" }, /* CPU_CLASS_XSCALE */ 306 }; 307 308 /* 309 * Report the type of the specifed arm processor. This uses the generic and 310 * arm specific information in the cpu structure to identify the processor. 311 * The remaining fields in the cpu structure are filled in appropriately. 312 */ 313 314 void 315 identify_arm_cpu(dv, cpu_number) 316 struct device *dv; 317 int cpu_number; 318 { 319 cpu_t *cpu; 320 u_int cpuid; 321 int i; 322 323 cpu = &cpus[cpu_number]; 324 cpuid = cpu->cpu_id; 325 326 if (cpuid == 0) { 327 printf("Processor failed probe - no CPU ID\n"); 328 return; 329 } 330 331 for (i = 0; cpuids[i].cpuid != 0; i++) 332 if (cpuids[i].cpuid == (cpuid & CPU_ID_CPU_MASK)) { 333 cpu->cpu_class = cpuids[i].cpu_class; 334 sprintf(cpu->cpu_model, "%s rev %d (%s core)", 335 cpuids[i].cpu_name, cpuid & CPU_ID_REVISION_MASK, 336 cpu_classes[cpu->cpu_class].class_name); 337 break; 338 } 339 340 if (cpuids[i].cpuid == 0) 341 sprintf(cpu->cpu_model, "unknown CPU (ID = 0x%x)", cpuid); 342 343 switch (cpu->cpu_class) { 344 case CPU_CLASS_ARM6: 345 case CPU_CLASS_ARM7: 346 case CPU_CLASS_ARM7TDMI: 347 case CPU_CLASS_ARM8: 348 if ((cpu->cpu_ctrl & CPU_CONTROL_IDC_ENABLE) == 0) 349 strcat(cpu->cpu_model, " IDC disabled"); 350 else 351 strcat(cpu->cpu_model, " IDC enabled"); 352 break; 353 case CPU_CLASS_ARM9TDMI: 354 case CPU_CLASS_SA1: 355 case CPU_CLASS_XSCALE: 356 if ((cpu->cpu_ctrl & CPU_CONTROL_DC_ENABLE) == 0) 357 strcat(cpu->cpu_model, " DC disabled"); 358 else 359 strcat(cpu->cpu_model, " DC enabled"); 360 if ((cpu->cpu_ctrl & CPU_CONTROL_IC_ENABLE) == 0) 361 strcat(cpu->cpu_model, " IC disabled"); 362 else 363 strcat(cpu->cpu_model, " IC enabled"); 364 break; 365 } 366 if ((cpu->cpu_ctrl & CPU_CONTROL_WBUF_ENABLE) == 0) 367 strcat(cpu->cpu_model, " WB disabled"); 368 else 369 strcat(cpu->cpu_model, " WB enabled"); 370 371 if (cpu->cpu_ctrl & CPU_CONTROL_LABT_ENABLE) 372 strcat(cpu->cpu_model, " LABT"); 373 else 374 strcat(cpu->cpu_model, " EABT"); 375 376 if (cpu->cpu_ctrl & CPU_CONTROL_BPRD_ENABLE) 377 strcat(cpu->cpu_model, " branch prediction enabled"); 378 379 /* Print the info */ 380 381 printf(": %s\n", cpu->cpu_model); 382 383 switch (cpu->cpu_class) { 384 #ifdef CPU_ARM2 385 case CPU_CLASS_ARM2: 386 #endif 387 #ifdef CPU_ARM250 388 case CPU_CLASS_ARM2AS: 389 #endif 390 #ifdef CPU_ARM3 391 case CPU_CLASS_ARM3: 392 #endif 393 #ifdef CPU_ARM6 394 case CPU_CLASS_ARM6: 395 #endif 396 #ifdef CPU_ARM7 397 case CPU_CLASS_ARM7: 398 #endif 399 #ifdef CPU_ARM7TDMI 400 case CPU_CLASS_ARM7TDMI: 401 #endif 402 #ifdef CPU_ARM8 403 case CPU_CLASS_ARM8: 404 #endif 405 #ifdef CPU_ARM9 406 case CPU_CLASS_ARM9TDMI: 407 #endif 408 #ifdef CPU_SA110 409 case CPU_CLASS_SA1: 410 #endif 411 #ifdef CPU_XSCALE 412 case CPU_CLASS_XSCALE: 413 #endif 414 break; 415 default: 416 if (cpu_classes[cpu->cpu_class].class_option != NULL) 417 printf("%s: %s does not fully support this CPU." 418 "\n", dv->dv_xname, ostype); 419 else { 420 printf("%s: This kernel does not fully support " 421 "this CPU.\n", dv->dv_xname); 422 printf("%s: Recompile with \"options %s\" to " 423 "correct this.\n", dv->dv_xname, 424 cpu_classes[cpu->cpu_class].class_option); 425 } 426 break; 427 } 428 429 } 430 431 432 /* 433 * Report the type of the specifed arm fpu. This uses the generic and arm 434 * specific information in the cpu structure to identify the fpu. The 435 * remaining fields in the cpu structure are filled in appropriately. 436 */ 437 438 void 439 identify_arm_fpu(dv, cpu_number) 440 struct device *dv; 441 int cpu_number; 442 { 443 cpu_t *cpu; 444 445 cpu = &cpus[cpu_number]; 446 447 /* Now for the FP info */ 448 449 switch (cpu->fpu_class) { 450 case FPU_CLASS_NONE : 451 strcpy(cpu->fpu_model, "None"); 452 break; 453 case FPU_CLASS_FPE : 454 printf("%s: FPE: %s\n", dv->dv_xname, cpu->fpu_model); 455 printf("%s: no FP hardware found\n", dv->dv_xname); 456 break; 457 case FPU_CLASS_FPA : 458 printf("%s: FPE: %s\n", dv->dv_xname, cpu->fpu_model); 459 if (cpu->fpu_type == FPU_TYPE_FPA11) { 460 strcpy(cpu->fpu_model, "FPA11"); 461 printf("%s: FPA11 found\n", dv->dv_xname); 462 } else { 463 strcpy(cpu->fpu_model, "FPA"); 464 printf("%s: FPA10 found\n", dv->dv_xname); 465 } 466 if ((cpu->fpu_flags & 4) == 0) 467 strcat(cpu->fpu_model, ""); 468 else 469 strcat(cpu->fpu_model, " clk/2"); 470 break; 471 case FPU_CLASS_FPU : 472 sprintf(cpu->fpu_model, "Unknown FPU (ID=%02x)\n", 473 cpu->fpu_type); 474 printf("%s: %s\n", dv->dv_xname, cpu->fpu_model); 475 break; 476 } 477 } 478 479 /* End of cpu.c */ 480
Indexes created Wed Sep 24 05:09:52 GMT 2025