xref: /openbmc/qemu/hw/ppc/spapr_rtas.c (revision 99367627)
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_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     env->spr[SPR_PSSCR] |= PSSCR_EC;
218     cs->halted = 1;
219     ppc_store_lpcr(cpu, env->spr[SPR_LPCR] & ~pcc->lpcr_pm);
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         g_autofree 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             /*
292              * Add HostThrs property. This property is not present in PAPR but
293              * is expected by some guests to communicate the number of physical
294              * host threads per core on the system so that they can scale
295              * information which varies based on the thread configuration.
296              */
297             g_autofree char *hostthr_val = g_strdup_printf(",HostThrs=%d",
298                                                            pcc->n_host_threads);
299             char *old = param_val;
300 
301             param_val = g_strconcat(param_val, hostthr_val, NULL);
302             g_free(old);
303         }
304         ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1);
305         break;
306     }
307     case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: {
308         uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED;
309 
310         ret = sysparm_st(buffer, length, &param_val, sizeof(param_val));
311         break;
312     }
313     case RTAS_SYSPARM_UUID:
314         ret = sysparm_st(buffer, length, (unsigned char *)&qemu_uuid,
315                          (qemu_uuid_set ? 16 : 0));
316         break;
317     default:
318         ret = RTAS_OUT_NOT_SUPPORTED;
319     }
320 
321     rtas_st(rets, 0, ret);
322 }
323 
324 static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu,
325                                           SpaprMachineState *spapr,
326                                           uint32_t token, uint32_t nargs,
327                                           target_ulong args,
328                                           uint32_t nret, target_ulong rets)
329 {
330     target_ulong parameter = rtas_ld(args, 0);
331     target_ulong ret = RTAS_OUT_NOT_SUPPORTED;
332 
333     switch (parameter) {
334     case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS:
335     case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE:
336     case RTAS_SYSPARM_UUID:
337         ret = RTAS_OUT_NOT_AUTHORIZED;
338         break;
339     }
340 
341     rtas_st(rets, 0, ret);
342 }
343 
344 static void rtas_ibm_os_term(PowerPCCPU *cpu,
345                             SpaprMachineState *spapr,
346                             uint32_t token, uint32_t nargs,
347                             target_ulong args,
348                             uint32_t nret, target_ulong rets)
349 {
350     target_ulong msgaddr = rtas_ld(args, 0);
351     char msg[512];
352 
353     cpu_physical_memory_read(msgaddr, msg, sizeof(msg) - 1);
354     msg[sizeof(msg) - 1] = 0;
355 
356     error_report("OS terminated: %s", msg);
357     qemu_system_guest_panicked(NULL);
358 
359     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
360 }
361 
362 static void rtas_set_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr,
363                                  uint32_t token, uint32_t nargs,
364                                  target_ulong args, uint32_t nret,
365                                  target_ulong rets)
366 {
367     int32_t power_domain;
368 
369     if (nargs != 2 || nret != 2) {
370         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
371         return;
372     }
373 
374     /* we currently only use a single, "live insert" powerdomain for
375      * hotplugged/dlpar'd resources, so the power is always live/full (100)
376      */
377     power_domain = rtas_ld(args, 0);
378     if (power_domain != -1) {
379         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
380         return;
381     }
382 
383     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
384     rtas_st(rets, 1, 100);
385 }
386 
387 static void rtas_get_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr,
388                                   uint32_t token, uint32_t nargs,
389                                   target_ulong args, uint32_t nret,
390                                   target_ulong rets)
391 {
392     int32_t power_domain;
393 
394     if (nargs != 1 || nret != 2) {
395         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
396         return;
397     }
398 
399     /* we currently only use a single, "live insert" powerdomain for
400      * hotplugged/dlpar'd resources, so the power is always live/full (100)
401      */
402     power_domain = rtas_ld(args, 0);
403     if (power_domain != -1) {
404         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
405         return;
406     }
407 
408     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
409     rtas_st(rets, 1, 100);
410 }
411 
412 static void rtas_ibm_nmi_register(PowerPCCPU *cpu,
413                                   SpaprMachineState *spapr,
414                                   uint32_t token, uint32_t nargs,
415                                   target_ulong args,
416                                   uint32_t nret, target_ulong rets)
417 {
418     hwaddr rtas_addr;
419     target_ulong sreset_addr, mce_addr;
420 
421     if (spapr_get_cap(spapr, SPAPR_CAP_FWNMI) == SPAPR_CAP_OFF) {
422         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
423         return;
424     }
425 
426     rtas_addr = spapr_get_rtas_addr();
427     if (!rtas_addr) {
428         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
429         return;
430     }
431 
432     sreset_addr = rtas_ld(args, 0);
433     mce_addr = rtas_ld(args, 1);
434 
435     /* PAPR requires these are in the first 32M of memory and within RMA */
436     if (sreset_addr >= 32 * MiB || sreset_addr >= spapr->rma_size ||
437            mce_addr >= 32 * MiB ||    mce_addr >= spapr->rma_size) {
438         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
439         return;
440     }
441 
442     if (kvm_enabled()) {
443         if (kvmppc_set_fwnmi(cpu) < 0) {
444             rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
445             return;
446         }
447     }
448 
449     spapr->fwnmi_system_reset_addr = sreset_addr;
450     spapr->fwnmi_machine_check_addr = mce_addr;
451 
452     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
453 }
454 
455 static void rtas_ibm_nmi_interlock(PowerPCCPU *cpu,
456                                    SpaprMachineState *spapr,
457                                    uint32_t token, uint32_t nargs,
458                                    target_ulong args,
459                                    uint32_t nret, target_ulong rets)
460 {
461     if (spapr_get_cap(spapr, SPAPR_CAP_FWNMI) == SPAPR_CAP_OFF) {
462         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
463         return;
464     }
465 
466     if (spapr->fwnmi_machine_check_addr == -1) {
467         qemu_log_mask(LOG_GUEST_ERROR,
468 "FWNMI: ibm,nmi-interlock RTAS called with FWNMI not registered.\n");
469 
470         /* NMI register not called */
471         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
472         return;
473     }
474 
475     if (spapr->fwnmi_machine_check_interlock != cpu->vcpu_id) {
476         /*
477          * The vCPU that hit the NMI should invoke "ibm,nmi-interlock"
478          * This should be PARAM_ERROR, but Linux calls "ibm,nmi-interlock"
479          * for system reset interrupts, despite them not being interlocked.
480          * PowerVM silently ignores this and returns success here. Returning
481          * failure causes Linux to print the error "FWNMI: nmi-interlock
482          * failed: -3", although no other apparent ill effects, this is a
483          * regression for the user when enabling FWNMI. So for now, match
484          * PowerVM. When most Linux clients are fixed, this could be
485          * changed.
486          */
487         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
488         return;
489     }
490 
491     /*
492      * vCPU issuing "ibm,nmi-interlock" is done with NMI handling,
493      * hence unset fwnmi_machine_check_interlock.
494      */
495     spapr->fwnmi_machine_check_interlock = -1;
496     qemu_cond_signal(&spapr->fwnmi_machine_check_interlock_cond);
497     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
498     migrate_del_blocker(&spapr->fwnmi_migration_blocker);
499 }
500 
501 static struct rtas_call {
502     const char *name;
503     spapr_rtas_fn fn;
504 } rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE];
505 
506 target_ulong spapr_rtas_call(PowerPCCPU *cpu, SpaprMachineState *spapr,
507                              uint32_t token, uint32_t nargs, target_ulong args,
508                              uint32_t nret, target_ulong rets)
509 {
510     if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) {
511         struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE);
512 
513         if (call->fn) {
514             call->fn(cpu, spapr, token, nargs, args, nret, rets);
515             return H_SUCCESS;
516         }
517     }
518 
519     /* HACK: Some Linux early debug code uses RTAS display-character,
520      * but assumes the token value is 0xa (which it is on some real
521      * machines) without looking it up in the device tree.  This
522      * special case makes this work */
523     if (token == 0xa) {
524         rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets);
525         return H_SUCCESS;
526     }
527 
528     hcall_dprintf("Unknown RTAS token 0x%x\n", token);
529     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
530     return H_PARAMETER;
531 }
532 
533 static uint64_t qtest_rtas_call(char *cmd, uint32_t nargs, uint64_t args,
534                                 uint32_t nret, uint64_t rets)
535 {
536     int token;
537 
538     for (token = 0; token < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; token++) {
539         if (strcmp(cmd, rtas_table[token].name) == 0) {
540             SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
541             PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
542 
543             rtas_table[token].fn(cpu, spapr, token + RTAS_TOKEN_BASE,
544                                  nargs, args, nret, rets);
545             return H_SUCCESS;
546         }
547     }
548     return H_PARAMETER;
549 }
550 
551 static bool spapr_qtest_callback(CharBackend *chr, gchar **words)
552 {
553     if (strcmp(words[0], "rtas") == 0) {
554         uint64_t res, args, ret;
555         unsigned long nargs, nret;
556         int rc;
557 
558         rc = qemu_strtoul(words[2], NULL, 0, &nargs);
559         g_assert(rc == 0);
560         rc = qemu_strtou64(words[3], NULL, 0, &args);
561         g_assert(rc == 0);
562         rc = qemu_strtoul(words[4], NULL, 0, &nret);
563         g_assert(rc == 0);
564         rc = qemu_strtou64(words[5], NULL, 0, &ret);
565         g_assert(rc == 0);
566         res = qtest_rtas_call(words[1], nargs, args, nret, ret);
567 
568         qtest_send_prefix(chr);
569         qtest_sendf(chr, "OK %"PRIu64"\n", res);
570 
571         return true;
572     }
573 
574     return false;
575 }
576 
577 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn)
578 {
579     assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX));
580 
581     token -= RTAS_TOKEN_BASE;
582 
583     assert(!name || !rtas_table[token].name);
584 
585     rtas_table[token].name = name;
586     rtas_table[token].fn = fn;
587 }
588 
589 void spapr_dt_rtas_tokens(void *fdt, int rtas)
590 {
591     int i;
592 
593     for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) {
594         struct rtas_call *call = &rtas_table[i];
595 
596         if (!call->name) {
597             continue;
598         }
599 
600         _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE));
601     }
602 }
603 
604 hwaddr spapr_get_rtas_addr(void)
605 {
606     SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
607     int rtas_node;
608     const fdt32_t *rtas_data;
609     void *fdt = spapr->fdt_blob;
610 
611     /* fetch rtas addr from fdt */
612     rtas_node = fdt_path_offset(fdt, "/rtas");
613     if (rtas_node < 0) {
614         return 0;
615     }
616 
617     rtas_data = fdt_getprop(fdt, rtas_node, "linux,rtas-base", NULL);
618     if (!rtas_data) {
619         return 0;
620     }
621 
622     /*
623      * We assume that the OS called RTAS instantiate-rtas, but some other
624      * OS might call RTAS instantiate-rtas-64 instead. This fine as of now
625      * as SLOF only supports 32-bit variant.
626      */
627     return (hwaddr)fdt32_to_cpu(*rtas_data);
628 }
629 
630 static void core_rtas_register_types(void)
631 {
632     spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character",
633                         rtas_display_character);
634     spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off);
635     spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot",
636                         rtas_system_reboot);
637     spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state",
638                         rtas_query_cpu_stopped_state);
639     spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu);
640     spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self);
641     spapr_rtas_register(RTAS_IBM_SUSPEND_ME, "ibm,suspend-me",
642                         rtas_ibm_suspend_me);
643     spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER,
644                         "ibm,get-system-parameter",
645                         rtas_ibm_get_system_parameter);
646     spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER,
647                         "ibm,set-system-parameter",
648                         rtas_ibm_set_system_parameter);
649     spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term",
650                         rtas_ibm_os_term);
651     spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level",
652                         rtas_set_power_level);
653     spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level",
654                         rtas_get_power_level);
655     spapr_rtas_register(RTAS_IBM_NMI_REGISTER, "ibm,nmi-register",
656                         rtas_ibm_nmi_register);
657     spapr_rtas_register(RTAS_IBM_NMI_INTERLOCK, "ibm,nmi-interlock",
658                         rtas_ibm_nmi_interlock);
659 
660     qtest_set_command_cb(spapr_qtest_callback);
661 }
662 
663 type_init(core_rtas_register_types)
664