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