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 #include "cpu.h"
  28 #include "sysemu/sysemu.h"
  29 #include "sysemu/char.h"
  30 #include "hw/qdev.h"
  31 #include "sysemu/device_tree.h"
  32
  33 #include "hw/ppc/spapr.h"
  34 #include "hw/ppc/spapr_vio.h"
  35 #include "qapi-event.h"
  36
  37 #include <libfdt.h>
  38
  39 static void rtas_display_character(PowerPCCPU *cpu, sPAPREnvironment *spapr,
  40                                    uint32_t token, uint32_t nargs,
  41                                    target_ulong args,
  42                                    uint32_t nret, target_ulong rets)
  43 {
  44     uint8_t c = rtas_ld(args, 0);
  45     VIOsPAPRDevice *sdev = vty_lookup(spapr, 0);
  46
  47     if (!sdev) {
  48         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
  49     } else {
  50         vty_putchars(sdev, &c, sizeof(c));
  51         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  52     }
  53 }
  54
  55 static void rtas_get_time_of_day(PowerPCCPU *cpu, sPAPREnvironment *spapr,
  56                                  uint32_t token, uint32_t nargs,
  57                                  target_ulong args,
  58                                  uint32_t nret, target_ulong rets)
  59 {
  60     struct tm tm;
  61
  62     if (nret != 8) {
  63         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  64         return;
  65     }
  66
  67     qemu_get_timedate(&tm, spapr->rtc_offset);
  68
  69     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  70     rtas_st(rets, 1, tm.tm_year + 1900);
  71     rtas_st(rets, 2, tm.tm_mon + 1);
  72     rtas_st(rets, 3, tm.tm_mday);
  73     rtas_st(rets, 4, tm.tm_hour);
  74     rtas_st(rets, 5, tm.tm_min);
  75     rtas_st(rets, 6, tm.tm_sec);
  76     rtas_st(rets, 7, 0); /* we don't do nanoseconds */
  77 }
  78
  79 static void rtas_set_time_of_day(PowerPCCPU *cpu, sPAPREnvironment *spapr,
  80                                  uint32_t token, uint32_t nargs,
  81                                  target_ulong args,
  82                                  uint32_t nret, target_ulong rets)
  83 {
  84     struct tm tm;
  85
  86     tm.tm_year = rtas_ld(args, 0) - 1900;
  87     tm.tm_mon = rtas_ld(args, 1) - 1;
  88     tm.tm_mday = rtas_ld(args, 2);
  89     tm.tm_hour = rtas_ld(args, 3);
  90     tm.tm_min = rtas_ld(args, 4);
  91     tm.tm_sec = rtas_ld(args, 5);
  92
  93     /* Just generate a monitor event for the change */
  94     qapi_event_send_rtc_change(qemu_timedate_diff(&tm), &error_abort);
  95     spapr->rtc_offset = qemu_timedate_diff(&tm);
  96
  97     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  98 }
  99
 100 static void rtas_power_off(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 101                            uint32_t token, uint32_t nargs, target_ulong args,
 102                            uint32_t nret, target_ulong rets)
 103 {
 104     if (nargs != 2 || nret != 1) {
 105         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 106         return;
 107     }
 108     qemu_system_shutdown_request();
 109     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 110 }
 111
 112 static void rtas_system_reboot(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 113                                uint32_t token, uint32_t nargs,
 114                                target_ulong args,
 115                                uint32_t nret, target_ulong rets)
 116 {
 117     if (nargs != 0 || nret != 1) {
 118         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 119         return;
 120     }
 121     qemu_system_reset_request();
 122     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 123 }
 124
 125 static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_,
 126                                          sPAPREnvironment *spapr,
 127                                          uint32_t token, uint32_t nargs,
 128                                          target_ulong args,
 129                                          uint32_t nret, target_ulong rets)
 130 {
 131     target_ulong id;
 132     PowerPCCPU *cpu;
 133
 134     if (nargs != 1 || nret != 2) {
 135         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 136         return;
 137     }
 138
 139     id = rtas_ld(args, 0);
 140     cpu = ppc_get_vcpu_by_dt_id(id);
 141     if (cpu != NULL) {
 142         if (CPU(cpu)->halted) {
 143             rtas_st(rets, 1, 0);
 144         } else {
 145             rtas_st(rets, 1, 2);
 146         }
 147
 148         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 149         return;
 150     }
 151
 152     /* Didn't find a matching cpu */
 153     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 154 }
 155
 156 static void rtas_start_cpu(PowerPCCPU *cpu_, sPAPREnvironment *spapr,
 157                            uint32_t token, uint32_t nargs,
 158                            target_ulong args,
 159                            uint32_t nret, target_ulong rets)
 160 {
 161     target_ulong id, start, r3;
 162     PowerPCCPU *cpu;
 163
 164     if (nargs != 3 || nret != 1) {
 165         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 166         return;
 167     }
 168
 169     id = rtas_ld(args, 0);
 170     start = rtas_ld(args, 1);
 171     r3 = rtas_ld(args, 2);
 172
 173     cpu = ppc_get_vcpu_by_dt_id(id);
 174     if (cpu != NULL) {
 175         CPUState *cs = CPU(cpu);
 176         CPUPPCState *env = &cpu->env;
 177
 178         if (!cs->halted) {
 179             rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 180             return;
 181         }
 182
 183         /* This will make sure qemu state is up to date with kvm, and
 184          * mark it dirty so our changes get flushed back before the
 185          * new cpu enters */
 186         kvm_cpu_synchronize_state(cs);
 187
 188         env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
 189         env->nip = start;
 190         env->gpr[3] = r3;
 191         cs->halted = 0;
 192
 193         qemu_cpu_kick(cs);
 194
 195         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 196         return;
 197     }
 198
 199     /* Didn't find a matching cpu */
 200     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 201 }
 202
 203 static void rtas_stop_self(PowerPCCPU *cpu, sPAPREnvironment *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
 211     cs->halted = 1;
 212     cpu_exit(cs);
 213     /*
 214      * While stopping a CPU, the guest calls H_CPPR which
 215      * effectively disables interrupts on XICS level.
 216      * However decrementer interrupts in TCG can still
 217      * wake the CPU up so here we disable interrupts in MSR
 218      * as well.
 219      * As rtas_start_cpu() resets the whole MSR anyway, there is
 220      * no need to bother with specific bits, we just clear it.
 221      */
 222     env->msr = 0;
 223 }
 224
 225 static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,
 226                                           sPAPREnvironment *spapr,
 227                                           uint32_t token, uint32_t nargs,
 228                                           target_ulong args,
 229                                           uint32_t nret, target_ulong rets)
 230 {
 231     target_ulong parameter = rtas_ld(args, 0);
 232     target_ulong buffer = rtas_ld(args, 1);
 233     target_ulong length = rtas_ld(args, 2);
 234     target_ulong ret = RTAS_OUT_SUCCESS;
 235
 236     switch (parameter) {
 237     case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: {
 238         char *param_val = g_strdup_printf("MaxEntCap=%d,MaxPlatProcs=%d",
 239                                           max_cpus, smp_cpus);
 240         rtas_st_buffer(buffer, length, (uint8_t *)param_val, strlen(param_val));
 241         g_free(param_val);
 242         break;
 243     }
 244     case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: {
 245         uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED;
 246
 247         rtas_st_buffer(buffer, length, &param_val, sizeof(param_val));
 248         break;
 249     }
 250     case RTAS_SYSPARM_UUID:
 251         rtas_st_buffer(buffer, length, qemu_uuid, (qemu_uuid_set ? 16 : 0));
 252         break;
 253     default:
 254         ret = RTAS_OUT_NOT_SUPPORTED;
 255     }
 256
 257     rtas_st(rets, 0, ret);
 258 }
 259
 260 static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu,
 261                                           sPAPREnvironment *spapr,
 262                                           uint32_t token, uint32_t nargs,
 263                                           target_ulong args,
 264                                           uint32_t nret, target_ulong rets)
 265 {
 266     target_ulong parameter = rtas_ld(args, 0);
 267     target_ulong ret = RTAS_OUT_NOT_SUPPORTED;
 268
 269     switch (parameter) {
 270     case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS:
 271     case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE:
 272     case RTAS_SYSPARM_UUID:
 273         ret = RTAS_OUT_NOT_AUTHORIZED;
 274         break;
 275     }
 276
 277     rtas_st(rets, 0, ret);
 278 }
 279
 280 static struct rtas_call {
 281     const char *name;
 282     spapr_rtas_fn fn;
 283 } rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE];
 284
 285 target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 286                              uint32_t token, uint32_t nargs, target_ulong args,
 287                              uint32_t nret, target_ulong rets)
 288 {
 289     if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) {
 290         struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE);
 291
 292         if (call->fn) {
 293             call->fn(cpu, spapr, token, nargs, args, nret, rets);
 294             return H_SUCCESS;
 295         }
 296     }
 297
 298     /* HACK: Some Linux early debug code uses RTAS display-character,
 299      * but assumes the token value is 0xa (which it is on some real
 300      * machines) without looking it up in the device tree.  This
 301      * special case makes this work */
 302     if (token == 0xa) {
 303         rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets);
 304         return H_SUCCESS;
 305     }
 306
 307     hcall_dprintf("Unknown RTAS token 0x%x\n", token);
 308     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 309     return H_PARAMETER;
 310 }
 311
 312 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn)
 313 {
 314     if (!((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX))) {
 315         fprintf(stderr, "RTAS invalid token 0x%x\n", token);
 316         exit(1);
 317     }
 318
 319     token -= RTAS_TOKEN_BASE;
 320     if (rtas_table[token].name) {
 321         fprintf(stderr, "RTAS call \"%s\" is registered already as 0x%x\n",
 322                 rtas_table[token].name, token);
 323         exit(1);
 324     }
 325
 326     rtas_table[token].name = name;
 327     rtas_table[token].fn = fn;
 328 }
 329
 330 int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
 331                                  hwaddr rtas_size)
 332 {
 333     int ret;
 334     int i;
 335
 336     ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
 337     if (ret < 0) {
 338         fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
 339                 fdt_strerror(ret));
 340         return ret;
 341     }
 342
 343     ret = qemu_fdt_setprop_cell(fdt, "/rtas", "linux,rtas-base",
 344                                 rtas_addr);
 345     if (ret < 0) {
 346         fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
 347                 fdt_strerror(ret));
 348         return ret;
 349     }
 350
 351     ret = qemu_fdt_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
 352                                 rtas_addr);
 353     if (ret < 0) {
 354         fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
 355                 fdt_strerror(ret));
 356         return ret;
 357     }
 358
 359     ret = qemu_fdt_setprop_cell(fdt, "/rtas", "rtas-size",
 360                                 rtas_size);
 361     if (ret < 0) {
 362         fprintf(stderr, "Couldn't add rtas-size property: %s\n",
 363                 fdt_strerror(ret));
 364         return ret;
 365     }
 366
 367     for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) {
 368         struct rtas_call *call = &rtas_table[i];
 369
 370         if (!call->name) {
 371             continue;
 372         }
 373
 374         ret = qemu_fdt_setprop_cell(fdt, "/rtas", call->name,
 375                                     i + RTAS_TOKEN_BASE);
 376         if (ret < 0) {
 377             fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
 378                     call->name, fdt_strerror(ret));
 379             return ret;
 380         }
 381
 382     }
 383     return 0;
 384 }
 385
 386 static void core_rtas_register_types(void)
 387 {
 388     spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character",
 389                         rtas_display_character);
 390     spapr_rtas_register(RTAS_GET_TIME_OF_DAY, "get-time-of-day",
 391                         rtas_get_time_of_day);
 392     spapr_rtas_register(RTAS_SET_TIME_OF_DAY, "set-time-of-day",
 393                         rtas_set_time_of_day);
 394     spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off);
 395     spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot",
 396                         rtas_system_reboot);
 397     spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state",
 398                         rtas_query_cpu_stopped_state);
 399     spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu);
 400     spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self);
 401     spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER,
 402                         "ibm,get-system-parameter",
 403                         rtas_ibm_get_system_parameter);
 404     spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER,
 405                         "ibm,set-system-parameter",
 406                         rtas_ibm_set_system_parameter);
 407 }
 408
 409 type_init(core_rtas_register_types)