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 36 #include <libfdt.h> 37 38 #define TOKEN_BASE 0x2000 39 #define TOKEN_MAX 0x100 40 41 static void rtas_display_character(PowerPCCPU *cpu, sPAPREnvironment *spapr, 42 uint32_t token, uint32_t nargs, 43 target_ulong args, 44 uint32_t nret, target_ulong rets) 45 { 46 uint8_t c = rtas_ld(args, 0); 47 VIOsPAPRDevice *sdev = vty_lookup(spapr, 0); 48 49 if (!sdev) { 50 rtas_st(rets, 0, -1); 51 } else { 52 vty_putchars(sdev, &c, sizeof(c)); 53 rtas_st(rets, 0, 0); 54 } 55 } 56 57 static void rtas_get_time_of_day(PowerPCCPU *cpu, sPAPREnvironment *spapr, 58 uint32_t token, uint32_t nargs, 59 target_ulong args, 60 uint32_t nret, target_ulong rets) 61 { 62 struct tm tm; 63 64 if (nret != 8) { 65 rtas_st(rets, 0, -3); 66 return; 67 } 68 69 qemu_get_timedate(&tm, spapr->rtc_offset); 70 71 rtas_st(rets, 0, 0); /* Success */ 72 rtas_st(rets, 1, tm.tm_year + 1900); 73 rtas_st(rets, 2, tm.tm_mon + 1); 74 rtas_st(rets, 3, tm.tm_mday); 75 rtas_st(rets, 4, tm.tm_hour); 76 rtas_st(rets, 5, tm.tm_min); 77 rtas_st(rets, 6, tm.tm_sec); 78 rtas_st(rets, 7, 0); /* we don't do nanoseconds */ 79 } 80 81 static void rtas_set_time_of_day(PowerPCCPU *cpu, sPAPREnvironment *spapr, 82 uint32_t token, uint32_t nargs, 83 target_ulong args, 84 uint32_t nret, target_ulong rets) 85 { 86 struct tm tm; 87 88 tm.tm_year = rtas_ld(args, 0) - 1900; 89 tm.tm_mon = rtas_ld(args, 1) - 1; 90 tm.tm_mday = rtas_ld(args, 2); 91 tm.tm_hour = rtas_ld(args, 3); 92 tm.tm_min = rtas_ld(args, 4); 93 tm.tm_sec = rtas_ld(args, 5); 94 95 /* Just generate a monitor event for the change */ 96 rtc_change_mon_event(&tm); 97 spapr->rtc_offset = qemu_timedate_diff(&tm); 98 99 rtas_st(rets, 0, 0); /* Success */ 100 } 101 102 static void rtas_power_off(PowerPCCPU *cpu, sPAPREnvironment *spapr, 103 uint32_t token, uint32_t nargs, target_ulong args, 104 uint32_t nret, target_ulong rets) 105 { 106 if (nargs != 2 || nret != 1) { 107 rtas_st(rets, 0, -3); 108 return; 109 } 110 qemu_system_shutdown_request(); 111 rtas_st(rets, 0, 0); 112 } 113 114 static void rtas_system_reboot(PowerPCCPU *cpu, sPAPREnvironment *spapr, 115 uint32_t token, uint32_t nargs, 116 target_ulong args, 117 uint32_t nret, target_ulong rets) 118 { 119 if (nargs != 0 || nret != 1) { 120 rtas_st(rets, 0, -3); 121 return; 122 } 123 qemu_system_reset_request(); 124 rtas_st(rets, 0, 0); 125 } 126 127 static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_, 128 sPAPREnvironment *spapr, 129 uint32_t token, uint32_t nargs, 130 target_ulong args, 131 uint32_t nret, target_ulong rets) 132 { 133 target_ulong id; 134 CPUState *cpu; 135 136 if (nargs != 1 || nret != 2) { 137 rtas_st(rets, 0, -3); 138 return; 139 } 140 141 id = rtas_ld(args, 0); 142 cpu = qemu_get_cpu(id); 143 if (cpu != NULL) { 144 if (cpu->halted) { 145 rtas_st(rets, 1, 0); 146 } else { 147 rtas_st(rets, 1, 2); 148 } 149 150 rtas_st(rets, 0, 0); 151 return; 152 } 153 154 /* Didn't find a matching cpu */ 155 rtas_st(rets, 0, -3); 156 } 157 158 static void rtas_start_cpu(PowerPCCPU *cpu_, sPAPREnvironment *spapr, 159 uint32_t token, uint32_t nargs, 160 target_ulong args, 161 uint32_t nret, target_ulong rets) 162 { 163 target_ulong id, start, r3; 164 CPUState *cs; 165 166 if (nargs != 3 || nret != 1) { 167 rtas_st(rets, 0, -3); 168 return; 169 } 170 171 id = rtas_ld(args, 0); 172 start = rtas_ld(args, 1); 173 r3 = rtas_ld(args, 2); 174 175 cs = qemu_get_cpu(id); 176 if (cs != NULL) { 177 PowerPCCPU *cpu = POWERPC_CPU(cs); 178 CPUPPCState *env = &cpu->env; 179 180 if (!cs->halted) { 181 rtas_st(rets, 0, -1); 182 return; 183 } 184 185 /* This will make sure qemu state is up to date with kvm, and 186 * mark it dirty so our changes get flushed back before the 187 * new cpu enters */ 188 kvm_cpu_synchronize_state(cs); 189 190 env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME); 191 env->nip = start; 192 env->gpr[3] = r3; 193 cs->halted = 0; 194 195 qemu_cpu_kick(cs); 196 197 rtas_st(rets, 0, 0); 198 return; 199 } 200 201 /* Didn't find a matching cpu */ 202 rtas_st(rets, 0, -3); 203 } 204 205 static void rtas_stop_self(PowerPCCPU *cpu, sPAPREnvironment *spapr, 206 uint32_t token, uint32_t nargs, 207 target_ulong args, 208 uint32_t nret, target_ulong rets) 209 { 210 CPUState *cs = CPU(cpu); 211 CPUPPCState *env = &cpu->env; 212 213 cs->halted = 1; 214 cpu_exit(cs); 215 /* 216 * While stopping a CPU, the guest calls H_CPPR which 217 * effectively disables interrupts on XICS level. 218 * However decrementer interrupts in TCG can still 219 * wake the CPU up so here we disable interrupts in MSR 220 * as well. 221 * As rtas_start_cpu() resets the whole MSR anyway, there is 222 * no need to bother with specific bits, we just clear it. 223 */ 224 env->msr = 0; 225 } 226 227 static struct rtas_call { 228 const char *name; 229 spapr_rtas_fn fn; 230 } rtas_table[TOKEN_MAX]; 231 232 struct rtas_call *rtas_next = rtas_table; 233 234 target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPREnvironment *spapr, 235 uint32_t token, uint32_t nargs, target_ulong args, 236 uint32_t nret, target_ulong rets) 237 { 238 if ((token >= TOKEN_BASE) 239 && ((token - TOKEN_BASE) < TOKEN_MAX)) { 240 struct rtas_call *call = rtas_table + (token - TOKEN_BASE); 241 242 if (call->fn) { 243 call->fn(cpu, spapr, token, nargs, args, nret, rets); 244 return H_SUCCESS; 245 } 246 } 247 248 /* HACK: Some Linux early debug code uses RTAS display-character, 249 * but assumes the token value is 0xa (which it is on some real 250 * machines) without looking it up in the device tree. This 251 * special case makes this work */ 252 if (token == 0xa) { 253 rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets); 254 return H_SUCCESS; 255 } 256 257 hcall_dprintf("Unknown RTAS token 0x%x\n", token); 258 rtas_st(rets, 0, -3); 259 return H_PARAMETER; 260 } 261 262 int spapr_rtas_register(const char *name, spapr_rtas_fn fn) 263 { 264 int i; 265 266 for (i = 0; i < (rtas_next - rtas_table); i++) { 267 if (strcmp(name, rtas_table[i].name) == 0) { 268 fprintf(stderr, "RTAS call \"%s\" registered twice\n", name); 269 exit(1); 270 } 271 } 272 273 assert(rtas_next < (rtas_table + TOKEN_MAX)); 274 275 rtas_next->name = name; 276 rtas_next->fn = fn; 277 278 return (rtas_next++ - rtas_table) + TOKEN_BASE; 279 } 280 281 int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr, 282 hwaddr rtas_size) 283 { 284 int ret; 285 int i; 286 287 ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size); 288 if (ret < 0) { 289 fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n", 290 fdt_strerror(ret)); 291 return ret; 292 } 293 294 ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base", 295 rtas_addr); 296 if (ret < 0) { 297 fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n", 298 fdt_strerror(ret)); 299 return ret; 300 } 301 302 ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry", 303 rtas_addr); 304 if (ret < 0) { 305 fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n", 306 fdt_strerror(ret)); 307 return ret; 308 } 309 310 ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size", 311 rtas_size); 312 if (ret < 0) { 313 fprintf(stderr, "Couldn't add rtas-size property: %s\n", 314 fdt_strerror(ret)); 315 return ret; 316 } 317 318 for (i = 0; i < TOKEN_MAX; i++) { 319 struct rtas_call *call = &rtas_table[i]; 320 321 if (!call->name) { 322 continue; 323 } 324 325 ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name, 326 i + TOKEN_BASE); 327 if (ret < 0) { 328 fprintf(stderr, "Couldn't add rtas token for %s: %s\n", 329 call->name, fdt_strerror(ret)); 330 return ret; 331 } 332 333 } 334 return 0; 335 } 336 337 static void core_rtas_register_types(void) 338 { 339 spapr_rtas_register("display-character", rtas_display_character); 340 spapr_rtas_register("get-time-of-day", rtas_get_time_of_day); 341 spapr_rtas_register("set-time-of-day", rtas_set_time_of_day); 342 spapr_rtas_register("power-off", rtas_power_off); 343 spapr_rtas_register("system-reboot", rtas_system_reboot); 344 spapr_rtas_register("query-cpu-stopped-state", 345 rtas_query_cpu_stopped_state); 346 spapr_rtas_register("start-cpu", rtas_start_cpu); 347 spapr_rtas_register("stop-self", rtas_stop_self); 348 } 349 350 type_init(core_rtas_register_types) 351