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 #define DIAGNOSTICS_RUN_MODE 42 226 227 static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu, 228 sPAPREnvironment *spapr, 229 uint32_t token, uint32_t nargs, 230 target_ulong args, 231 uint32_t nret, target_ulong rets) 232 { 233 target_ulong parameter = rtas_ld(args, 0); 234 target_ulong buffer = rtas_ld(args, 1); 235 target_ulong length = rtas_ld(args, 2); 236 target_ulong ret = RTAS_OUT_NOT_SUPPORTED; 237 238 switch (parameter) { 239 case DIAGNOSTICS_RUN_MODE: 240 if (length == 1) { 241 rtas_st(buffer, 0, 0); 242 ret = RTAS_OUT_SUCCESS; 243 } 244 break; 245 } 246 247 rtas_st(rets, 0, ret); 248 } 249 250 static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu, 251 sPAPREnvironment *spapr, 252 uint32_t token, uint32_t nargs, 253 target_ulong args, 254 uint32_t nret, target_ulong rets) 255 { 256 target_ulong parameter = rtas_ld(args, 0); 257 target_ulong ret = RTAS_OUT_NOT_SUPPORTED; 258 259 switch (parameter) { 260 case DIAGNOSTICS_RUN_MODE: 261 ret = RTAS_OUT_NOT_AUTHORIZED; 262 break; 263 } 264 265 rtas_st(rets, 0, ret); 266 } 267 268 static struct rtas_call { 269 const char *name; 270 spapr_rtas_fn fn; 271 } rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE]; 272 273 target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPREnvironment *spapr, 274 uint32_t token, uint32_t nargs, target_ulong args, 275 uint32_t nret, target_ulong rets) 276 { 277 if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) { 278 struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE); 279 280 if (call->fn) { 281 call->fn(cpu, spapr, token, nargs, args, nret, rets); 282 return H_SUCCESS; 283 } 284 } 285 286 /* HACK: Some Linux early debug code uses RTAS display-character, 287 * but assumes the token value is 0xa (which it is on some real 288 * machines) without looking it up in the device tree. This 289 * special case makes this work */ 290 if (token == 0xa) { 291 rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets); 292 return H_SUCCESS; 293 } 294 295 hcall_dprintf("Unknown RTAS token 0x%x\n", token); 296 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 297 return H_PARAMETER; 298 } 299 300 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn) 301 { 302 if (!((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX))) { 303 fprintf(stderr, "RTAS invalid token 0x%x\n", token); 304 exit(1); 305 } 306 307 token -= RTAS_TOKEN_BASE; 308 if (rtas_table[token].name) { 309 fprintf(stderr, "RTAS call \"%s\" is registered already as 0x%x\n", 310 rtas_table[token].name, token); 311 exit(1); 312 } 313 314 rtas_table[token].name = name; 315 rtas_table[token].fn = fn; 316 } 317 318 int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr, 319 hwaddr rtas_size) 320 { 321 int ret; 322 int i; 323 324 ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size); 325 if (ret < 0) { 326 fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n", 327 fdt_strerror(ret)); 328 return ret; 329 } 330 331 ret = qemu_fdt_setprop_cell(fdt, "/rtas", "linux,rtas-base", 332 rtas_addr); 333 if (ret < 0) { 334 fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n", 335 fdt_strerror(ret)); 336 return ret; 337 } 338 339 ret = qemu_fdt_setprop_cell(fdt, "/rtas", "linux,rtas-entry", 340 rtas_addr); 341 if (ret < 0) { 342 fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n", 343 fdt_strerror(ret)); 344 return ret; 345 } 346 347 ret = qemu_fdt_setprop_cell(fdt, "/rtas", "rtas-size", 348 rtas_size); 349 if (ret < 0) { 350 fprintf(stderr, "Couldn't add rtas-size property: %s\n", 351 fdt_strerror(ret)); 352 return ret; 353 } 354 355 for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) { 356 struct rtas_call *call = &rtas_table[i]; 357 358 if (!call->name) { 359 continue; 360 } 361 362 ret = qemu_fdt_setprop_cell(fdt, "/rtas", call->name, 363 i + RTAS_TOKEN_BASE); 364 if (ret < 0) { 365 fprintf(stderr, "Couldn't add rtas token for %s: %s\n", 366 call->name, fdt_strerror(ret)); 367 return ret; 368 } 369 370 } 371 return 0; 372 } 373 374 static void core_rtas_register_types(void) 375 { 376 spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character", 377 rtas_display_character); 378 spapr_rtas_register(RTAS_GET_TIME_OF_DAY, "get-time-of-day", 379 rtas_get_time_of_day); 380 spapr_rtas_register(RTAS_SET_TIME_OF_DAY, "set-time-of-day", 381 rtas_set_time_of_day); 382 spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off); 383 spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot", 384 rtas_system_reboot); 385 spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state", 386 rtas_query_cpu_stopped_state); 387 spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu); 388 spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self); 389 spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER, 390 "ibm,get-system-parameter", 391 rtas_ibm_get_system_parameter); 392 spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER, 393 "ibm,set-system-parameter", 394 rtas_ibm_set_system_parameter); 395 } 396 397 type_init(core_rtas_register_types) 398