hw/ppc/spapr_rtas.c

   1 /*
   2  * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
   3  *
   4  * Hypercall based emulated RTAS
   5  *
   6  * Copyright (c) 2010-2011 David Gibson, IBM Corporation.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  *
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "qemu/log.h"
  30 #include "qemu/error-report.h"
  31 #include "sysemu/sysemu.h"
  32 #include "sysemu/device_tree.h"
  33 #include "sysemu/cpus.h"
  34 #include "sysemu/hw_accel.h"
  35 #include "sysemu/runstate.h"
  36 #include "kvm_ppc.h"
  37
  38 #include "hw/ppc/spapr.h"
  39 #include "hw/ppc/spapr_vio.h"
  40 #include "hw/ppc/spapr_rtas.h"
  41 #include "hw/ppc/spapr_cpu_core.h"
  42 #include "hw/ppc/ppc.h"
  43
  44 #include <libfdt.h>
  45 #include "hw/ppc/spapr_drc.h"
  46 #include "qemu/cutils.h"
  47 #include "trace.h"
  48 #include "hw/ppc/fdt.h"
  49 #include "target/ppc/mmu-hash64.h"
  50 #include "target/ppc/mmu-book3s-v3.h"
  51 #include "migration/blocker.h"
  52 #include "helper_regs.h"
  53
  54 static void rtas_display_character(PowerPCCPU *cpu, SpaprMachineState *spapr,
  55                                    uint32_t token, uint32_t nargs,
  56                                    target_ulong args,
  57                                    uint32_t nret, target_ulong rets)
  58 {
  59     uint8_t c = rtas_ld(args, 0);
  60     SpaprVioDevice *sdev = vty_lookup(spapr, 0);
  61
  62     if (!sdev) {
  63         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
  64     } else {
  65         vty_putchars(sdev, &c, sizeof(c));
  66         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  67     }
  68 }
  69
  70 static void rtas_power_off(PowerPCCPU *cpu, SpaprMachineState *spapr,
  71                            uint32_t token, uint32_t nargs, target_ulong args,
  72                            uint32_t nret, target_ulong rets)
  73 {
  74     if (nargs != 2 || nret != 1) {
  75         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  76         return;
  77     }
  78     qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
  79     cpu_stop_current();
  80     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  81 }
  82
  83 static void rtas_system_reboot(PowerPCCPU *cpu, SpaprMachineState *spapr,
  84                                uint32_t token, uint32_t nargs,
  85                                target_ulong args,
  86                                uint32_t nret, target_ulong rets)
  87 {
  88     if (nargs != 0 || nret != 1) {
  89         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  90         return;
  91     }
  92     qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
  93     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  94 }
  95
  96 static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_,
  97                                          SpaprMachineState *spapr,
  98                                          uint32_t token, uint32_t nargs,
  99                                          target_ulong args,
 100                                          uint32_t nret, target_ulong rets)
 101 {
 102     target_ulong id;
 103     PowerPCCPU *cpu;
 104
 105     if (nargs != 1 || nret != 2) {
 106         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 107         return;
 108     }
 109
 110     id = rtas_ld(args, 0);
 111     cpu = spapr_find_cpu(id);
 112     if (cpu != NULL) {
 113         if (CPU(cpu)->halted) {
 114             rtas_st(rets, 1, 0);
 115         } else {
 116             rtas_st(rets, 1, 2);
 117         }
 118
 119         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 120         return;
 121     }
 122
 123     /* Didn't find a matching cpu */
 124     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 125 }
 126
 127 static void rtas_start_cpu(PowerPCCPU *callcpu, SpaprMachineState *spapr,
 128                            uint32_t token, uint32_t nargs,
 129                            target_ulong args,
 130                            uint32_t nret, target_ulong rets)
 131 {
 132     target_ulong id, start, r3;
 133     PowerPCCPU *newcpu;
 134     CPUPPCState *env;
 135     target_ulong lpcr;
 136     target_ulong caller_lpcr;
 137
 138     if (nargs != 3 || nret != 1) {
 139         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 140         return;
 141     }
 142
 143     id = rtas_ld(args, 0);
 144     start = rtas_ld(args, 1);
 145     r3 = rtas_ld(args, 2);
 146
 147     newcpu = spapr_find_cpu(id);
 148     if (!newcpu) {
 149         /* Didn't find a matching cpu */
 150         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 151         return;
 152     }
 153
 154     env = &newcpu->env;
 155
 156     if (!CPU(newcpu)->halted) {
 157         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 158         return;
 159     }
 160
 161     cpu_synchronize_state(CPU(newcpu));
 162
 163     env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
 164     hreg_compute_hflags(env);
 165
 166     caller_lpcr = callcpu->env.spr[SPR_LPCR];
 167     lpcr = env->spr[SPR_LPCR];
 168
 169     /* Set ILE the same way */
 170     lpcr = (lpcr & ~LPCR_ILE) | (caller_lpcr & LPCR_ILE);
 171
 172     /* Set AIL the same way */
 173     lpcr = (lpcr & ~LPCR_AIL) | (caller_lpcr & LPCR_AIL);
 174
 175     if (env->mmu_model == POWERPC_MMU_3_00) {
 176         /*
 177          * New cpus are expected to start in the same radix/hash mode
 178          * as the existing CPUs
 179          */
 180         if (ppc64_v3_radix(callcpu)) {
 181             lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
 182         } else {
 183             lpcr &= ~(LPCR_UPRT | LPCR_GTSE | LPCR_HR);
 184         }
 185         env->spr[SPR_PSSCR] &= ~PSSCR_EC;
 186     }
 187     ppc_store_lpcr(newcpu, lpcr);
 188
 189     /*
 190      * Set the timebase offset of the new CPU to that of the invoking
 191      * CPU.  This helps hotplugged CPU to have the correct timebase
 192      * offset.
 193      */
 194     newcpu->env.tb_env->tb_offset = callcpu->env.tb_env->tb_offset;
 195
 196     spapr_cpu_set_entry_state(newcpu, start, 0, r3, 0);
 197
 198     qemu_cpu_kick(CPU(newcpu));
 199
 200     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 201 }
 202
 203 static void rtas_stop_self(PowerPCCPU *cpu, SpaprMachineState *spapr,
 204                            uint32_t token, uint32_t nargs,
 205                            target_ulong args,
 206                            uint32_t nret, target_ulong rets)
 207 {
 208     CPUState *cs = CPU(cpu);
 209     CPUPPCState *env = &cpu->env;
 210     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
 211
 212     /* Disable Power-saving mode Exit Cause exceptions for the CPU.
 213      * This could deliver an interrupt on a dying CPU and crash the
 214      * guest.
 215      * For the same reason, set PSSCR_EC.
 216      */
 217     ppc_store_lpcr(cpu, env->spr[SPR_LPCR] & ~pcc->lpcr_pm);
 218     env->spr[SPR_PSSCR] |= PSSCR_EC;
 219     cs->halted = 1;
 220     kvmppc_set_reg_ppc_online(cpu, 0);
 221     qemu_cpu_kick(cs);
 222 }
 223
 224 static void rtas_ibm_suspend_me(PowerPCCPU *cpu, SpaprMachineState *spapr,
 225                                 uint32_t token, uint32_t nargs,
 226                                 target_ulong args,
 227                                 uint32_t nret, target_ulong rets)
 228 {
 229     CPUState *cs;
 230
 231     if (nargs != 0 || nret != 1) {
 232         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 233         return;
 234     }
 235
 236     CPU_FOREACH(cs) {
 237         PowerPCCPU *c = POWERPC_CPU(cs);
 238         CPUPPCState *e = &c->env;
 239         if (c == cpu) {
 240             continue;
 241         }
 242
 243         /* See h_join */
 244         if (!cs->halted || (e->msr & (1ULL << MSR_EE))) {
 245             rtas_st(rets, 0, H_MULTI_THREADS_ACTIVE);
 246             return;
 247         }
 248     }
 249
 250     qemu_system_suspend_request();
 251     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 252 }
 253
 254 static inline int sysparm_st(target_ulong addr, target_ulong len,
 255                              const void *val, uint16_t vallen)
 256 {
 257     hwaddr phys = ppc64_phys_to_real(addr);
 258
 259     if (len < 2) {
 260         return RTAS_OUT_SYSPARM_PARAM_ERROR;
 261     }
 262     stw_be_phys(&address_space_memory, phys, vallen);
 263     cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen));
 264     return RTAS_OUT_SUCCESS;
 265 }
 266
 267 static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,
 268                                           SpaprMachineState *spapr,
 269                                           uint32_t token, uint32_t nargs,
 270                                           target_ulong args,
 271                                           uint32_t nret, target_ulong rets)
 272 {
 273     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
 274     MachineState *ms = MACHINE(spapr);
 275     target_ulong parameter = rtas_ld(args, 0);
 276     target_ulong buffer = rtas_ld(args, 1);
 277     target_ulong length = rtas_ld(args, 2);
 278     target_ulong ret;
 279
 280     switch (parameter) {
 281     case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: {
 282         char *param_val = g_strdup_printf("MaxEntCap=%d,"
 283                                           "DesMem=%" PRIu64 ","
 284                                           "DesProcs=%d,"
 285                                           "MaxPlatProcs=%d",
 286                                           ms->smp.max_cpus,
 287                                           ms->ram_size / MiB,
 288                                           ms->smp.cpus,
 289                                           ms->smp.max_cpus);
 290         if (pcc->n_host_threads > 0) {
 291             char *hostthr_val, *old = param_val;
 292
 293             /*
 294              * Add HostThrs property. This property is not present in PAPR but
 295              * is expected by some guests to communicate the number of physical
 296              * host threads per core on the system so that they can scale
 297              * information which varies based on the thread configuration.
 298              */
 299             hostthr_val = g_strdup_printf(",HostThrs=%d", pcc->n_host_threads);
 300             param_val = g_strconcat(param_val, hostthr_val, NULL);
 301             g_free(hostthr_val);
 302             g_free(old);
 303         }
 304         ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1);
 305         g_free(param_val);
 306         break;
 307     }
 308     case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: {
 309         uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED;
 310
 311         ret = sysparm_st(buffer, length, &param_val, sizeof(param_val));
 312         break;
 313     }
 314     case RTAS_SYSPARM_UUID:
 315         ret = sysparm_st(buffer, length, (unsigned char *)&qemu_uuid,
 316                          (qemu_uuid_set ? 16 : 0));
 317         break;
 318     default:
 319         ret = RTAS_OUT_NOT_SUPPORTED;
 320     }
 321
 322     rtas_st(rets, 0, ret);
 323 }
 324
 325 static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu,
 326                                           SpaprMachineState *spapr,
 327                                           uint32_t token, uint32_t nargs,
 328                                           target_ulong args,
 329                                           uint32_t nret, target_ulong rets)
 330 {
 331     target_ulong parameter = rtas_ld(args, 0);
 332     target_ulong ret = RTAS_OUT_NOT_SUPPORTED;
 333
 334     switch (parameter) {
 335     case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS:
 336     case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE:
 337     case RTAS_SYSPARM_UUID:
 338         ret = RTAS_OUT_NOT_AUTHORIZED;
 339         break;
 340     }
 341
 342     rtas_st(rets, 0, ret);
 343 }
 344
 345 static void rtas_ibm_os_term(PowerPCCPU *cpu,
 346                             SpaprMachineState *spapr,
 347                             uint32_t token, uint32_t nargs,
 348                             target_ulong args,
 349                             uint32_t nret, target_ulong rets)
 350 {
 351     target_ulong msgaddr = rtas_ld(args, 0);
 352     char msg[512];
 353
 354     cpu_physical_memory_read(msgaddr, msg, sizeof(msg) - 1);
 355     msg[sizeof(msg) - 1] = 0;
 356
 357     error_report("OS terminated: %s", msg);
 358     qemu_system_guest_panicked(NULL);
 359
 360     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 361 }
 362
 363 static void rtas_set_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr,
 364                                  uint32_t token, uint32_t nargs,
 365                                  target_ulong args, uint32_t nret,
 366                                  target_ulong rets)
 367 {
 368     int32_t power_domain;
 369
 370     if (nargs != 2 || nret != 2) {
 371         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 372         return;
 373     }
 374
 375     /* we currently only use a single, "live insert" powerdomain for
 376      * hotplugged/dlpar'd resources, so the power is always live/full (100)
 377      */
 378     power_domain = rtas_ld(args, 0);
 379     if (power_domain != -1) {
 380         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
 381         return;
 382     }
 383
 384     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 385     rtas_st(rets, 1, 100);
 386 }
 387
 388 static void rtas_get_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr,
 389                                   uint32_t token, uint32_t nargs,
 390                                   target_ulong args, uint32_t nret,
 391                                   target_ulong rets)
 392 {
 393     int32_t power_domain;
 394
 395     if (nargs != 1 || nret != 2) {
 396         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 397         return;
 398     }
 399
 400     /* we currently only use a single, "live insert" powerdomain for
 401      * hotplugged/dlpar'd resources, so the power is always live/full (100)
 402      */
 403     power_domain = rtas_ld(args, 0);
 404     if (power_domain != -1) {
 405         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
 406         return;
 407     }
 408
 409     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 410     rtas_st(rets, 1, 100);
 411 }
 412
 413 static void rtas_ibm_nmi_register(PowerPCCPU *cpu,
 414                                   SpaprMachineState *spapr,
 415                                   uint32_t token, uint32_t nargs,
 416                                   target_ulong args,
 417                                   uint32_t nret, target_ulong rets)
 418 {
 419     hwaddr rtas_addr;
 420     target_ulong sreset_addr, mce_addr;
 421
 422     if (spapr_get_cap(spapr, SPAPR_CAP_FWNMI) == SPAPR_CAP_OFF) {
 423         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
 424         return;
 425     }
 426
 427     rtas_addr = spapr_get_rtas_addr();
 428     if (!rtas_addr) {
 429         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
 430         return;
 431     }
 432
 433     sreset_addr = rtas_ld(args, 0);
 434     mce_addr = rtas_ld(args, 1);
 435
 436     /* PAPR requires these are in the first 32M of memory and within RMA */
 437     if (sreset_addr >= 32 * MiB || sreset_addr >= spapr->rma_size ||
 438            mce_addr >= 32 * MiB ||    mce_addr >= spapr->rma_size) {
 439         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 440         return;
 441     }
 442
 443     if (kvm_enabled()) {
 444         if (kvmppc_set_fwnmi(cpu) < 0) {
 445             rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
 446             return;
 447         }
 448     }
 449
 450     spapr->fwnmi_system_reset_addr = sreset_addr;
 451     spapr->fwnmi_machine_check_addr = mce_addr;
 452
 453     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 454 }
 455
 456 static void rtas_ibm_nmi_interlock(PowerPCCPU *cpu,
 457                                    SpaprMachineState *spapr,
 458                                    uint32_t token, uint32_t nargs,
 459                                    target_ulong args,
 460                                    uint32_t nret, target_ulong rets)
 461 {
 462     if (spapr_get_cap(spapr, SPAPR_CAP_FWNMI) == SPAPR_CAP_OFF) {
 463         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
 464         return;
 465     }
 466
 467     if (spapr->fwnmi_machine_check_addr == -1) {
 468         qemu_log_mask(LOG_GUEST_ERROR,
 469 "FWNMI: ibm,nmi-interlock RTAS called with FWNMI not registered.\n");
 470
 471         /* NMI register not called */
 472         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 473         return;
 474     }
 475
 476     if (spapr->fwnmi_machine_check_interlock != cpu->vcpu_id) {
 477         /*
 478          * The vCPU that hit the NMI should invoke "ibm,nmi-interlock"
 479          * This should be PARAM_ERROR, but Linux calls "ibm,nmi-interlock"
 480          * for system reset interrupts, despite them not being interlocked.
 481          * PowerVM silently ignores this and returns success here. Returning
 482          * failure causes Linux to print the error "FWNMI: nmi-interlock
 483          * failed: -3", although no other apparent ill effects, this is a
 484          * regression for the user when enabling FWNMI. So for now, match
 485          * PowerVM. When most Linux clients are fixed, this could be
 486          * changed.
 487          */
 488         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 489         return;
 490     }
 491
 492     /*
 493      * vCPU issuing "ibm,nmi-interlock" is done with NMI handling,
 494      * hence unset fwnmi_machine_check_interlock.
 495      */
 496     spapr->fwnmi_machine_check_interlock = -1;
 497     qemu_cond_signal(&spapr->fwnmi_machine_check_interlock_cond);
 498     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 499     migrate_del_blocker(spapr->fwnmi_migration_blocker);
 500 }
 501
 502 static struct rtas_call {
 503     const char *name;
 504     spapr_rtas_fn fn;
 505 } rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE];
 506
 507 target_ulong spapr_rtas_call(PowerPCCPU *cpu, SpaprMachineState *spapr,
 508                              uint32_t token, uint32_t nargs, target_ulong args,
 509                              uint32_t nret, target_ulong rets)
 510 {
 511     if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) {
 512         struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE);
 513
 514         if (call->fn) {
 515             call->fn(cpu, spapr, token, nargs, args, nret, rets);
 516             return H_SUCCESS;
 517         }
 518     }
 519
 520     /* HACK: Some Linux early debug code uses RTAS display-character,
 521      * but assumes the token value is 0xa (which it is on some real
 522      * machines) without looking it up in the device tree.  This
 523      * special case makes this work */
 524     if (token == 0xa) {
 525         rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets);
 526         return H_SUCCESS;
 527     }
 528
 529     hcall_dprintf("Unknown RTAS token 0x%x\n", token);
 530     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 531     return H_PARAMETER;
 532 }
 533
 534 uint64_t qtest_rtas_call(char *cmd, uint32_t nargs, uint64_t args,
 535                          uint32_t nret, uint64_t rets)
 536 {
 537     int token;
 538
 539     for (token = 0; token < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; token++) {
 540         if (strcmp(cmd, rtas_table[token].name) == 0) {
 541             SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
 542             PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
 543
 544             rtas_table[token].fn(cpu, spapr, token + RTAS_TOKEN_BASE,
 545                                  nargs, args, nret, rets);
 546             return H_SUCCESS;
 547         }
 548     }
 549     return H_PARAMETER;
 550 }
 551
 552 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn)
 553 {
 554     assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX));
 555
 556     token -= RTAS_TOKEN_BASE;
 557
 558     assert(!name || !rtas_table[token].name);
 559
 560     rtas_table[token].name = name;
 561     rtas_table[token].fn = fn;
 562 }
 563
 564 void spapr_dt_rtas_tokens(void *fdt, int rtas)
 565 {
 566     int i;
 567
 568     for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) {
 569         struct rtas_call *call = &rtas_table[i];
 570
 571         if (!call->name) {
 572             continue;
 573         }
 574
 575         _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE));
 576     }
 577 }
 578
 579 hwaddr spapr_get_rtas_addr(void)
 580 {
 581     SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
 582     int rtas_node;
 583     const fdt32_t *rtas_data;
 584     void *fdt = spapr->fdt_blob;
 585
 586     /* fetch rtas addr from fdt */
 587     rtas_node = fdt_path_offset(fdt, "/rtas");
 588     if (rtas_node < 0) {
 589         return 0;
 590     }
 591
 592     rtas_data = fdt_getprop(fdt, rtas_node, "linux,rtas-base", NULL);
 593     if (!rtas_data) {
 594         return 0;
 595     }
 596
 597     /*
 598      * We assume that the OS called RTAS instantiate-rtas, but some other
 599      * OS might call RTAS instantiate-rtas-64 instead. This fine as of now
 600      * as SLOF only supports 32-bit variant.
 601      */
 602     return (hwaddr)fdt32_to_cpu(*rtas_data);
 603 }
 604
 605 static void core_rtas_register_types(void)
 606 {
 607     spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character",
 608                         rtas_display_character);
 609     spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off);
 610     spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot",
 611                         rtas_system_reboot);
 612     spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state",
 613                         rtas_query_cpu_stopped_state);
 614     spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu);
 615     spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self);
 616     spapr_rtas_register(RTAS_IBM_SUSPEND_ME, "ibm,suspend-me",
 617                         rtas_ibm_suspend_me);
 618     spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER,
 619                         "ibm,get-system-parameter",
 620                         rtas_ibm_get_system_parameter);
 621     spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER,
 622                         "ibm,set-system-parameter",
 623                         rtas_ibm_set_system_parameter);
 624     spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term",
 625                         rtas_ibm_os_term);
 626     spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level",
 627                         rtas_set_power_level);
 628     spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level",
 629                         rtas_get_power_level);
 630     spapr_rtas_register(RTAS_IBM_NMI_REGISTER, "ibm,nmi-register",
 631                         rtas_ibm_nmi_register);
 632     spapr_rtas_register(RTAS_IBM_NMI_INTERLOCK, "ibm,nmi-interlock",
 633                         rtas_ibm_nmi_interlock);
 634 }
 635
 636 type_init(core_rtas_register_types)