xref: /qemu/hw/ppc/spapr_rtas.c (revision 370ed600) 
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 "sysemu/qtest.h"
37 #include "kvm_ppc.h"
38 
39 #include "hw/ppc/spapr.h"
40 #include "hw/ppc/spapr_vio.h"
41 #include "hw/ppc/spapr_rtas.h"
42 #include "hw/ppc/spapr_cpu_core.h"
43 #include "hw/ppc/ppc.h"
44 
45 #include <libfdt.h>
46 #include "hw/ppc/spapr_drc.h"
47 #include "qemu/cutils.h"
48 #include "trace.h"
49 #include "hw/ppc/fdt.h"
50 #include "target/ppc/mmu-hash64.h"
51 #include "target/ppc/mmu-book3s-v3.h"
52 #include "migration/blocker.h"
53 #include "helper_regs.h"
54 
55 static void rtas_display_character(PowerPCCPU *cpu, SpaprMachineState *spapr,
56                                    uint32_t token, uint32_t nargs,
57                                    target_ulong args,
58                                    uint32_t nret, target_ulong rets)
59 {
60     uint8_t c = rtas_ld(args, 0);
61     SpaprVioDevice *sdev = vty_lookup(spapr, 0);
62 
63     if (!sdev) {
64         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
65     } else {
66         vty_putchars(sdev, &c, sizeof(c));
67         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
68     }
69 }
70 
71 static void rtas_power_off(PowerPCCPU *cpu, SpaprMachineState *spapr,
72                            uint32_t token, uint32_t nargs, target_ulong args,
73                            uint32_t nret, target_ulong rets)
74 {
75     if (nargs != 2 || nret != 1) {
76         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
77         return;
78     }
79     qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
80     cpu_stop_current();
81     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
82 }
83 
84 static void rtas_system_reboot(PowerPCCPU *cpu, SpaprMachineState *spapr,
85                                uint32_t token, uint32_t nargs,
86                                target_ulong args,
87                                uint32_t nret, target_ulong rets)
88 {
89     if (nargs != 0 || nret != 1) {
90         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
91         return;
92     }
93     qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
94     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
95 }
96 
97 static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_,
98                                          SpaprMachineState *spapr,
99                                          uint32_t token, uint32_t nargs,
100                                          target_ulong args,
101                                          uint32_t nret, target_ulong rets)
102 {
103     target_ulong id;
104     PowerPCCPU *cpu;
105 
106     if (nargs != 1 || nret != 2) {
107         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
108         return;
109     }
110 
111     id = rtas_ld(args, 0);
112     cpu = spapr_find_cpu(id);
113     if (cpu != NULL) {
114         if (CPU(cpu)->halted) {
115             rtas_st(rets, 1, 0);
116         } else {
117             rtas_st(rets, 1, 2);
118         }
119 
120         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
121         return;
122     }
123 
124     /* Didn't find a matching cpu */
125     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
126 }
127 
128 static void rtas_start_cpu(PowerPCCPU *callcpu, SpaprMachineState *spapr,
129                            uint32_t token, uint32_t nargs,
130                            target_ulong args,
131                            uint32_t nret, target_ulong rets)
132 {
133     target_ulong id, start, r3;
134     PowerPCCPU *newcpu;
135     CPUPPCState *env;
136     target_ulong lpcr;
137     target_ulong caller_lpcr;
138 
139     if (nargs != 3 || nret != 1) {
140         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
141         return;
142     }
143 
144     id = rtas_ld(args, 0);
145     start = rtas_ld(args, 1);
146     r3 = rtas_ld(args, 2);
147 
148     newcpu = spapr_find_cpu(id);
149     if (!newcpu) {
150         /* Didn't find a matching cpu */
151         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
152         return;
153     }
154 
155     env = &newcpu->env;
156 
157     if (!CPU(newcpu)->halted) {
158         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
159         return;
160     }
161 
162     cpu_synchronize_state(CPU(newcpu));
163 
164     env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
165     hreg_compute_hflags(env);
166 
167     caller_lpcr = callcpu->env.spr[SPR_LPCR];
168     lpcr = env->spr[SPR_LPCR];
169 
170     /* Set ILE the same way */
171     lpcr = (lpcr & ~LPCR_ILE) | (caller_lpcr & LPCR_ILE);
172 
173     /* Set AIL the same way */
174     lpcr = (lpcr & ~LPCR_AIL) | (caller_lpcr & LPCR_AIL);
175 
176     if (env->mmu_model == POWERPC_MMU_3_00) {
177         /*
178          * New cpus are expected to start in the same radix/hash mode
179          * as the existing CPUs
180          */
181         if (ppc64_v3_radix(callcpu)) {
182             lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
183         } else {
184             lpcr &= ~(LPCR_UPRT | LPCR_GTSE | LPCR_HR);
185         }
186         env->spr[SPR_PSSCR] &= ~PSSCR_EC;
187     }
188     ppc_store_lpcr(newcpu, lpcr);
189 
190     /*
191      * Set the timebase offset of the new CPU to that of the invoking
192      * CPU.  This helps hotplugged CPU to have the correct timebase
193      * offset.
194      */
195     newcpu->env.tb_env->tb_offset = callcpu->env.tb_env->tb_offset;
196 
197     spapr_cpu_set_entry_state(newcpu, start, 0, r3, 0);
198 
199     qemu_cpu_kick(CPU(newcpu));
200 
201     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
202 }
203 
204 static void rtas_stop_self(PowerPCCPU *cpu, SpaprMachineState *spapr,
205                            uint32_t token, uint32_t nargs,
206                            target_ulong args,
207                            uint32_t nret, target_ulong rets)
208 {
209     CPUState *cs = CPU(cpu);
210     CPUPPCState *env = &cpu->env;
211     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
212 
213     /* Disable Power-saving mode Exit Cause exceptions for the CPU.
214      * This could deliver an interrupt on a dying CPU and crash the
215      * guest.
216      * For the same reason, set PSSCR_EC.
217      */
218     env->spr[SPR_PSSCR] |= PSSCR_EC;
219     cs->halted = 1;
220     ppc_store_lpcr(cpu, env->spr[SPR_LPCR] & ~pcc->lpcr_pm);
221     kvmppc_set_reg_ppc_online(cpu, 0);
222     qemu_cpu_kick(cs);
223 }
224 
225 static void rtas_ibm_suspend_me(PowerPCCPU *cpu, SpaprMachineState *spapr,
226                                 uint32_t token, uint32_t nargs,
227                                 target_ulong args,
228                                 uint32_t nret, target_ulong rets)
229 {
230     CPUState *cs;
231 
232     if (nargs != 0 || nret != 1) {
233         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
234         return;
235     }
236 
237     CPU_FOREACH(cs) {
238         PowerPCCPU *c = POWERPC_CPU(cs);
239         CPUPPCState *e = &c->env;
240         if (c == cpu) {
241             continue;
242         }
243 
244         /* See h_join */
245         if (!cs->halted || (e->msr & (1ULL << MSR_EE))) {
246             rtas_st(rets, 0, H_MULTI_THREADS_ACTIVE);
247             return;
248         }
249     }
250 
251     qemu_system_suspend_request();
252     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
253 }
254 
255 static inline int sysparm_st(target_ulong addr, target_ulong len,
256                              const void *val, uint16_t vallen)
257 {
258     hwaddr phys = ppc64_phys_to_real(addr);
259 
260     if (len < 2) {
261         return RTAS_OUT_SYSPARM_PARAM_ERROR;
262     }
263     stw_be_phys(&address_space_memory, phys, vallen);
264     cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen));
265     return RTAS_OUT_SUCCESS;
266 }
267 
268 static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,
269                                           SpaprMachineState *spapr,
270                                           uint32_t token, uint32_t nargs,
271                                           target_ulong args,
272                                           uint32_t nret, target_ulong rets)
273 {
274     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
275     MachineState *ms = MACHINE(spapr);
276     target_ulong parameter = rtas_ld(args, 0);
277     target_ulong buffer = rtas_ld(args, 1);
278     target_ulong length = rtas_ld(args, 2);
279     target_ulong ret;
280 
281     switch (parameter) {
282     case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: {
283         g_autofree char *param_val = g_strdup_printf("MaxEntCap=%d,"
284                                                      "DesMem=%" PRIu64 ","
285                                                      "DesProcs=%d,"
286                                                      "MaxPlatProcs=%d",
287                                                      ms->smp.max_cpus,
288                                                      ms->ram_size / MiB,
289                                                      ms->smp.cpus,
290                                                      ms->smp.max_cpus);
291         if (pcc->n_host_threads > 0) {
292             /*
293              * Add HostThrs property. This property is not present in PAPR but
294              * is expected by some guests to communicate the number of physical
295              * host threads per core on the system so that they can scale
296              * information which varies based on the thread configuration.
297              */
298             g_autofree char *hostthr_val = g_strdup_printf(",HostThrs=%d",
299                                                            pcc->n_host_threads);
300             char *old = param_val;
301 
302             param_val = g_strconcat(param_val, hostthr_val, NULL);
303             g_free(old);
304         }
305         ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1);
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 static bool spapr_qtest_callback(CharBackend *chr, gchar **words)
553 {
554     if (strcmp(words[0], "rtas") == 0) {
555         uint64_t res, args, ret;
556         unsigned long nargs, nret;
557         int rc;
558 
559         rc = qemu_strtoul(words[2], NULL, 0, &nargs);
560         g_assert(rc == 0);
561         rc = qemu_strtou64(words[3], NULL, 0, &args);
562         g_assert(rc == 0);
563         rc = qemu_strtoul(words[4], NULL, 0, &nret);
564         g_assert(rc == 0);
565         rc = qemu_strtou64(words[5], NULL, 0, &ret);
566         g_assert(rc == 0);
567         res = qtest_rtas_call(words[1], nargs, args, nret, ret);
568 
569         qtest_send_prefix(chr);
570         qtest_sendf(chr, "OK %"PRIu64"\n", res);
571 
572         return true;
573     }
574 
575     return false;
576 }
577 
578 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn)
579 {
580     assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX));
581 
582     token -= RTAS_TOKEN_BASE;
583 
584     assert(!name || !rtas_table[token].name);
585 
586     rtas_table[token].name = name;
587     rtas_table[token].fn = fn;
588 }
589 
590 void spapr_dt_rtas_tokens(void *fdt, int rtas)
591 {
592     int i;
593 
594     for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) {
595         struct rtas_call *call = &rtas_table[i];
596 
597         if (!call->name) {
598             continue;
599         }
600 
601         _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE));
602     }
603 }
604 
605 hwaddr spapr_get_rtas_addr(void)
606 {
607     SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
608     int rtas_node;
609     const fdt32_t *rtas_data;
610     void *fdt = spapr->fdt_blob;
611 
612     /* fetch rtas addr from fdt */
613     rtas_node = fdt_path_offset(fdt, "/rtas");
614     if (rtas_node < 0) {
615         return 0;
616     }
617 
618     rtas_data = fdt_getprop(fdt, rtas_node, "linux,rtas-base", NULL);
619     if (!rtas_data) {
620         return 0;
621     }
622 
623     /*
624      * We assume that the OS called RTAS instantiate-rtas, but some other
625      * OS might call RTAS instantiate-rtas-64 instead. This fine as of now
626      * as SLOF only supports 32-bit variant.
627      */
628     return (hwaddr)fdt32_to_cpu(*rtas_data);
629 }
630 
631 static void core_rtas_register_types(void)
632 {
633     spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character",
634                         rtas_display_character);
635     spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off);
636     spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot",
637                         rtas_system_reboot);
638     spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state",
639                         rtas_query_cpu_stopped_state);
640     spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu);
641     spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self);
642     spapr_rtas_register(RTAS_IBM_SUSPEND_ME, "ibm,suspend-me",
643                         rtas_ibm_suspend_me);
644     spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER,
645                         "ibm,get-system-parameter",
646                         rtas_ibm_get_system_parameter);
647     spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER,
648                         "ibm,set-system-parameter",
649                         rtas_ibm_set_system_parameter);
650     spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term",
651                         rtas_ibm_os_term);
652     spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level",
653                         rtas_set_power_level);
654     spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level",
655                         rtas_get_power_level);
656     spapr_rtas_register(RTAS_IBM_NMI_REGISTER, "ibm,nmi-register",
657                         rtas_ibm_nmi_register);
658     spapr_rtas_register(RTAS_IBM_NMI_INTERLOCK, "ibm,nmi-interlock",
659                         rtas_ibm_nmi_interlock);
660 
661     qtest_set_command_cb(spapr_qtest_callback);
662 }
663 
664 type_init(core_rtas_register_types)
665