hw/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.h"
  29 #include "qemu-char.h"
  30 #include "hw/qdev.h"
  31 #include "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
 135     if (nargs != 1 || nret != 2) {
 136         rtas_st(rets, 0, -3);
 137         return;
 138     }
 139
 140     id = rtas_ld(args, 0);
 141     for (env = first_cpu; env; env = env->next_cpu) {
 142         if (env->cpu_index != id) {
 143             continue;
 144         }
 145
 146         if (env->halted) {
 147             rtas_st(rets, 1, 0);
 148         } else {
 149             rtas_st(rets, 1, 2);
 150         }
 151
 152         rtas_st(rets, 0, 0);
 153         return;
 154     }
 155
 156     /* Didn't find a matching cpu */
 157     rtas_st(rets, 0, -3);
 158 }
 159
 160 static void rtas_start_cpu(sPAPREnvironment *spapr,
 161                            uint32_t token, uint32_t nargs,
 162                            target_ulong args,
 163                            uint32_t nret, target_ulong rets)
 164 {
 165     target_ulong id, start, r3;
 166     CPUPPCState *env;
 167
 168     if (nargs != 3 || nret != 1) {
 169         rtas_st(rets, 0, -3);
 170         return;
 171     }
 172
 173     id = rtas_ld(args, 0);
 174     start = rtas_ld(args, 1);
 175     r3 = rtas_ld(args, 2);
 176
 177     for (env = first_cpu; env; env = env->next_cpu) {
 178         if (env->cpu_index != id) {
 179             continue;
 180         }
 181
 182         if (!env->halted) {
 183             rtas_st(rets, 0, -1);
 184             return;
 185         }
 186
 187         /* This will make sure qemu state is up to date with kvm, and
 188          * mark it dirty so our changes get flushed back before the
 189          * new cpu enters */
 190         kvm_cpu_synchronize_state(env);
 191
 192         env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
 193         env->nip = start;
 194         env->gpr[3] = r3;
 195         env->halted = 0;
 196
 197         qemu_cpu_kick(env);
 198
 199         rtas_st(rets, 0, 0);
 200         return;
 201     }
 202
 203     /* Didn't find a matching cpu */
 204     rtas_st(rets, 0, -3);
 205 }
 206
 207 static struct rtas_call {
 208     const char *name;
 209     spapr_rtas_fn fn;
 210 } rtas_table[TOKEN_MAX];
 211
 212 struct rtas_call *rtas_next = rtas_table;
 213
 214 target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
 215                              uint32_t token, uint32_t nargs, target_ulong args,
 216                              uint32_t nret, target_ulong rets)
 217 {
 218     if ((token >= TOKEN_BASE)
 219         && ((token - TOKEN_BASE) < TOKEN_MAX)) {
 220         struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
 221
 222         if (call->fn) {
 223             call->fn(spapr, token, nargs, args, nret, rets);
 224             return H_SUCCESS;
 225         }
 226     }
 227
 228     /* HACK: Some Linux early debug code uses RTAS display-character,
 229      * but assumes the token value is 0xa (which it is on some real
 230      * machines) without looking it up in the device tree.  This
 231      * special case makes this work */
 232     if (token == 0xa) {
 233         rtas_display_character(spapr, 0xa, nargs, args, nret, rets);
 234         return H_SUCCESS;
 235     }
 236
 237     hcall_dprintf("Unknown RTAS token 0x%x\n", token);
 238     rtas_st(rets, 0, -3);
 239     return H_PARAMETER;
 240 }
 241
 242 void spapr_rtas_register(const char *name, spapr_rtas_fn fn)
 243 {
 244     int i;
 245
 246     for (i = 0; i < (rtas_next - rtas_table); i++) {
 247         if (strcmp(name, rtas_table[i].name) == 0) {
 248             fprintf(stderr, "RTAS call \"%s\" registered twice\n", name);
 249             exit(1);
 250         }
 251     }
 252
 253     assert(rtas_next < (rtas_table + TOKEN_MAX));
 254
 255     rtas_next->name = name;
 256     rtas_next->fn = fn;
 257
 258     rtas_next++;
 259 }
 260
 261 int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
 262                                  hwaddr rtas_size)
 263 {
 264     int ret;
 265     int i;
 266
 267     ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
 268     if (ret < 0) {
 269         fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
 270                 fdt_strerror(ret));
 271         return ret;
 272     }
 273
 274     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base",
 275                                     rtas_addr);
 276     if (ret < 0) {
 277         fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
 278                 fdt_strerror(ret));
 279         return ret;
 280     }
 281
 282     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
 283                                     rtas_addr);
 284     if (ret < 0) {
 285         fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
 286                 fdt_strerror(ret));
 287         return ret;
 288     }
 289
 290     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size",
 291                                     rtas_size);
 292     if (ret < 0) {
 293         fprintf(stderr, "Couldn't add rtas-size property: %s\n",
 294                 fdt_strerror(ret));
 295         return ret;
 296     }
 297
 298     for (i = 0; i < TOKEN_MAX; i++) {
 299         struct rtas_call *call = &rtas_table[i];
 300
 301         if (!call->fn) {
 302             continue;
 303         }
 304
 305         ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
 306                                         i + TOKEN_BASE);
 307         if (ret < 0) {
 308             fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
 309                     call->name, fdt_strerror(ret));
 310             return ret;
 311         }
 312
 313     }
 314     return 0;
 315 }
 316
 317 static void core_rtas_register_types(void)
 318 {
 319     spapr_rtas_register("display-character", rtas_display_character);
 320     spapr_rtas_register("get-time-of-day", rtas_get_time_of_day);
 321     spapr_rtas_register("set-time-of-day", rtas_set_time_of_day);
 322     spapr_rtas_register("power-off", rtas_power_off);
 323     spapr_rtas_register("system-reboot", rtas_system_reboot);
 324     spapr_rtas_register("query-cpu-stopped-state",
 325                         rtas_query_cpu_stopped_state);
 326     spapr_rtas_register("start-cpu", rtas_start_cpu);
 327 }
 328
 329 type_init(core_rtas_register_types)