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 = spapr_vio_find_by_reg(spapr->vio_bus,
  48                                                  SPAPR_VTY_BASE_ADDRESS);
  49
  50     if (!sdev) {
  51         rtas_st(rets, 0, -1);
  52     } else {
  53         vty_putchars(sdev, &c, sizeof(c));
  54         rtas_st(rets, 0, 0);
  55     }
  56 }
  57
  58 static void rtas_get_time_of_day(sPAPREnvironment *spapr,
  59                                  uint32_t token, uint32_t nargs,
  60                                  target_ulong args,
  61                                  uint32_t nret, target_ulong rets)
  62 {
  63     struct tm tm;
  64
  65     if (nret != 8) {
  66         rtas_st(rets, 0, -3);
  67         return;
  68     }
  69
  70     qemu_get_timedate(&tm, spapr->rtc_offset);
  71
  72     rtas_st(rets, 0, 0); /* Success */
  73     rtas_st(rets, 1, tm.tm_year + 1900);
  74     rtas_st(rets, 2, tm.tm_mon + 1);
  75     rtas_st(rets, 3, tm.tm_mday);
  76     rtas_st(rets, 4, tm.tm_hour);
  77     rtas_st(rets, 5, tm.tm_min);
  78     rtas_st(rets, 6, tm.tm_sec);
  79     rtas_st(rets, 7, 0); /* we don't do nanoseconds */
  80 }
  81
  82 static void rtas_set_time_of_day(sPAPREnvironment *spapr,
  83                                  uint32_t token, uint32_t nargs,
  84                                  target_ulong args,
  85                                  uint32_t nret, target_ulong rets)
  86 {
  87     struct tm tm;
  88
  89     tm.tm_year = rtas_ld(args, 0) - 1900;
  90     tm.tm_mon = rtas_ld(args, 1) - 1;
  91     tm.tm_mday = rtas_ld(args, 2);
  92     tm.tm_hour = rtas_ld(args, 3);
  93     tm.tm_min = rtas_ld(args, 4);
  94     tm.tm_sec = rtas_ld(args, 5);
  95
  96     /* Just generate a monitor event for the change */
  97     rtc_change_mon_event(&tm);
  98     spapr->rtc_offset = qemu_timedate_diff(&tm);
  99
 100     rtas_st(rets, 0, 0); /* Success */
 101 }
 102
 103 static void rtas_power_off(sPAPREnvironment *spapr,
 104                            uint32_t token, uint32_t nargs, target_ulong args,
 105                            uint32_t nret, target_ulong rets)
 106 {
 107     if (nargs != 2 || nret != 1) {
 108         rtas_st(rets, 0, -3);
 109         return;
 110     }
 111     qemu_system_shutdown_request();
 112     rtas_st(rets, 0, 0);
 113 }
 114
 115 static void rtas_query_cpu_stopped_state(sPAPREnvironment *spapr,
 116                                          uint32_t token, uint32_t nargs,
 117                                          target_ulong args,
 118                                          uint32_t nret, target_ulong rets)
 119 {
 120     target_ulong id;
 121     CPUState *env;
 122
 123     if (nargs != 1 || nret != 2) {
 124         rtas_st(rets, 0, -3);
 125         return;
 126     }
 127
 128     id = rtas_ld(args, 0);
 129     for (env = first_cpu; env; env = env->next_cpu) {
 130         if (env->cpu_index != id) {
 131             continue;
 132         }
 133
 134         if (env->halted) {
 135             rtas_st(rets, 1, 0);
 136         } else {
 137             rtas_st(rets, 1, 2);
 138         }
 139
 140         rtas_st(rets, 0, 0);
 141         return;
 142     }
 143
 144     /* Didn't find a matching cpu */
 145     rtas_st(rets, 0, -3);
 146 }
 147
 148 static void rtas_start_cpu(sPAPREnvironment *spapr,
 149                            uint32_t token, uint32_t nargs,
 150                            target_ulong args,
 151                            uint32_t nret, target_ulong rets)
 152 {
 153     target_ulong id, start, r3;
 154     CPUState *env;
 155
 156     if (nargs != 3 || nret != 1) {
 157         rtas_st(rets, 0, -3);
 158         return;
 159     }
 160
 161     id = rtas_ld(args, 0);
 162     start = rtas_ld(args, 1);
 163     r3 = rtas_ld(args, 2);
 164
 165     for (env = first_cpu; env; env = env->next_cpu) {
 166         if (env->cpu_index != id) {
 167             continue;
 168         }
 169
 170         if (!env->halted) {
 171             rtas_st(rets, 0, -1);
 172             return;
 173         }
 174
 175         env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
 176         env->nip = start;
 177         env->gpr[3] = r3;
 178         env->halted = 0;
 179
 180         qemu_cpu_kick(env);
 181
 182         rtas_st(rets, 0, 0);
 183         return;
 184     }
 185
 186     /* Didn't find a matching cpu */
 187     rtas_st(rets, 0, -3);
 188 }
 189
 190 static struct rtas_call {
 191     const char *name;
 192     spapr_rtas_fn fn;
 193 } rtas_table[TOKEN_MAX];
 194
 195 struct rtas_call *rtas_next = rtas_table;
 196
 197 target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
 198                              uint32_t token, uint32_t nargs, target_ulong args,
 199                              uint32_t nret, target_ulong rets)
 200 {
 201     if ((token >= TOKEN_BASE)
 202         && ((token - TOKEN_BASE) < TOKEN_MAX)) {
 203         struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
 204
 205         if (call->fn) {
 206             call->fn(spapr, token, nargs, args, nret, rets);
 207             return H_SUCCESS;
 208         }
 209     }
 210
 211     /* HACK: Some Linux early debug code uses RTAS display-character,
 212      * but assumes the token value is 0xa (which it is on some real
 213      * machines) without looking it up in the device tree.  This
 214      * special case makes this work */
 215     if (token == 0xa) {
 216         rtas_display_character(spapr, 0xa, nargs, args, nret, rets);
 217         return H_SUCCESS;
 218     }
 219
 220     hcall_dprintf("Unknown RTAS token 0x%x\n", token);
 221     rtas_st(rets, 0, -3);
 222     return H_PARAMETER;
 223 }
 224
 225 void spapr_rtas_register(const char *name, spapr_rtas_fn fn)
 226 {
 227     assert(rtas_next < (rtas_table + TOKEN_MAX));
 228
 229     rtas_next->name = name;
 230     rtas_next->fn = fn;
 231
 232     rtas_next++;
 233 }
 234
 235 int spapr_rtas_device_tree_setup(void *fdt, target_phys_addr_t rtas_addr,
 236                                  target_phys_addr_t rtas_size)
 237 {
 238     int ret;
 239     int i;
 240
 241     ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
 242     if (ret < 0) {
 243         fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
 244                 fdt_strerror(ret));
 245         return ret;
 246     }
 247
 248     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base",
 249                                     rtas_addr);
 250     if (ret < 0) {
 251         fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
 252                 fdt_strerror(ret));
 253         return ret;
 254     }
 255
 256     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
 257                                     rtas_addr);
 258     if (ret < 0) {
 259         fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
 260                 fdt_strerror(ret));
 261         return ret;
 262     }
 263
 264     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size",
 265                                     rtas_size);
 266     if (ret < 0) {
 267         fprintf(stderr, "Couldn't add rtas-size property: %s\n",
 268                 fdt_strerror(ret));
 269         return ret;
 270     }
 271
 272     for (i = 0; i < TOKEN_MAX; i++) {
 273         struct rtas_call *call = &rtas_table[i];
 274
 275         if (!call->fn) {
 276             continue;
 277         }
 278
 279         ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
 280                                         i + TOKEN_BASE);
 281         if (ret < 0) {
 282             fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
 283                     call->name, fdt_strerror(ret));
 284             return ret;
 285         }
 286
 287     }
 288     return 0;
 289 }
 290
 291 static void register_core_rtas(void)
 292 {
 293     spapr_rtas_register("display-character", rtas_display_character);
 294     spapr_rtas_register("get-time-of-day", rtas_get_time_of_day);
 295     spapr_rtas_register("set-time-of-day", rtas_set_time_of_day);
 296     spapr_rtas_register("power-off", rtas_power_off);
 297     spapr_rtas_register("query-cpu-stopped-state",
 298                         rtas_query_cpu_stopped_state);
 299     spapr_rtas_register("start-cpu", rtas_start_cpu);
 300 }
 301 device_init(register_core_rtas);