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 "char/char.h" 30 #include "hw/qdev.h" 31 #include "sysemu/device_tree.h" 32 33 #include "hw/spapr.h" 34 #include "hw/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(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(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(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(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(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(sPAPREnvironment *spapr, 128 uint32_t token, uint32_t nargs, 129 target_ulong args, 130 uint32_t nret, target_ulong rets) 131 { 132 target_ulong id; 133 CPUPPCState *env; 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 for (env = first_cpu; env; env = env->next_cpu) { 143 cpu = CPU(ppc_env_get_cpu(env)); 144 if (cpu->cpu_index != id) { 145 continue; 146 } 147 148 if (env->halted) { 149 rtas_st(rets, 1, 0); 150 } else { 151 rtas_st(rets, 1, 2); 152 } 153 154 rtas_st(rets, 0, 0); 155 return; 156 } 157 158 /* Didn't find a matching cpu */ 159 rtas_st(rets, 0, -3); 160 } 161 162 static void rtas_start_cpu(sPAPREnvironment *spapr, 163 uint32_t token, uint32_t nargs, 164 target_ulong args, 165 uint32_t nret, target_ulong rets) 166 { 167 target_ulong id, start, r3; 168 CPUState *cpu; 169 CPUPPCState *env; 170 171 if (nargs != 3 || nret != 1) { 172 rtas_st(rets, 0, -3); 173 return; 174 } 175 176 id = rtas_ld(args, 0); 177 start = rtas_ld(args, 1); 178 r3 = rtas_ld(args, 2); 179 180 for (env = first_cpu; env; env = env->next_cpu) { 181 cpu = CPU(ppc_env_get_cpu(env)); 182 183 if (cpu->cpu_index != id) { 184 continue; 185 } 186 187 if (!env->halted) { 188 rtas_st(rets, 0, -1); 189 return; 190 } 191 192 /* This will make sure qemu state is up to date with kvm, and 193 * mark it dirty so our changes get flushed back before the 194 * new cpu enters */ 195 kvm_cpu_synchronize_state(env); 196 197 env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME); 198 env->nip = start; 199 env->gpr[3] = r3; 200 env->halted = 0; 201 202 qemu_cpu_kick(cpu); 203 204 rtas_st(rets, 0, 0); 205 return; 206 } 207 208 /* Didn't find a matching cpu */ 209 rtas_st(rets, 0, -3); 210 } 211 212 static struct rtas_call { 213 const char *name; 214 spapr_rtas_fn fn; 215 } rtas_table[TOKEN_MAX]; 216 217 struct rtas_call *rtas_next = rtas_table; 218 219 target_ulong spapr_rtas_call(sPAPREnvironment *spapr, 220 uint32_t token, uint32_t nargs, target_ulong args, 221 uint32_t nret, target_ulong rets) 222 { 223 if ((token >= TOKEN_BASE) 224 && ((token - TOKEN_BASE) < TOKEN_MAX)) { 225 struct rtas_call *call = rtas_table + (token - TOKEN_BASE); 226 227 if (call->fn) { 228 call->fn(spapr, token, nargs, args, nret, rets); 229 return H_SUCCESS; 230 } 231 } 232 233 /* HACK: Some Linux early debug code uses RTAS display-character, 234 * but assumes the token value is 0xa (which it is on some real 235 * machines) without looking it up in the device tree. This 236 * special case makes this work */ 237 if (token == 0xa) { 238 rtas_display_character(spapr, 0xa, nargs, args, nret, rets); 239 return H_SUCCESS; 240 } 241 242 hcall_dprintf("Unknown RTAS token 0x%x\n", token); 243 rtas_st(rets, 0, -3); 244 return H_PARAMETER; 245 } 246 247 int spapr_rtas_register(const char *name, spapr_rtas_fn fn) 248 { 249 int i; 250 251 for (i = 0; i < (rtas_next - rtas_table); i++) { 252 if (strcmp(name, rtas_table[i].name) == 0) { 253 fprintf(stderr, "RTAS call \"%s\" registered twice\n", name); 254 exit(1); 255 } 256 } 257 258 assert(rtas_next < (rtas_table + TOKEN_MAX)); 259 260 rtas_next->name = name; 261 rtas_next->fn = fn; 262 263 return (rtas_next++ - rtas_table) + TOKEN_BASE; 264 } 265 266 int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr, 267 hwaddr rtas_size) 268 { 269 int ret; 270 int i; 271 272 ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size); 273 if (ret < 0) { 274 fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n", 275 fdt_strerror(ret)); 276 return ret; 277 } 278 279 ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base", 280 rtas_addr); 281 if (ret < 0) { 282 fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n", 283 fdt_strerror(ret)); 284 return ret; 285 } 286 287 ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry", 288 rtas_addr); 289 if (ret < 0) { 290 fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n", 291 fdt_strerror(ret)); 292 return ret; 293 } 294 295 ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size", 296 rtas_size); 297 if (ret < 0) { 298 fprintf(stderr, "Couldn't add rtas-size property: %s\n", 299 fdt_strerror(ret)); 300 return ret; 301 } 302 303 for (i = 0; i < TOKEN_MAX; i++) { 304 struct rtas_call *call = &rtas_table[i]; 305 306 if (!call->name) { 307 continue; 308 } 309 310 ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name, 311 i + TOKEN_BASE); 312 if (ret < 0) { 313 fprintf(stderr, "Couldn't add rtas token for %s: %s\n", 314 call->name, fdt_strerror(ret)); 315 return ret; 316 } 317 318 } 319 return 0; 320 } 321 322 static void core_rtas_register_types(void) 323 { 324 spapr_rtas_register("display-character", rtas_display_character); 325 spapr_rtas_register("get-time-of-day", rtas_get_time_of_day); 326 spapr_rtas_register("set-time-of-day", rtas_set_time_of_day); 327 spapr_rtas_register("power-off", rtas_power_off); 328 spapr_rtas_register("system-reboot", rtas_system_reboot); 329 spapr_rtas_register("query-cpu-stopped-state", 330 rtas_query_cpu_stopped_state); 331 spapr_rtas_register("start-cpu", rtas_start_cpu); 332 } 333 334 type_init(core_rtas_register_types) 335