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, 0);
  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_power_off(sPAPREnvironment *spapr,
  83                            uint32_t token, uint32_t nargs, target_ulong args,
  84                            uint32_t nret, target_ulong rets)
  85 {
  86     if (nargs != 2 || nret != 1) {
  87         rtas_st(rets, 0, -3);
  88         return;
  89     }
  90     qemu_system_shutdown_request();
  91     rtas_st(rets, 0, 0);
  92 }
  93
  94 static void rtas_query_cpu_stopped_state(sPAPREnvironment *spapr,
  95                                          uint32_t token, uint32_t nargs,
  96                                          target_ulong args,
  97                                          uint32_t nret, target_ulong rets)
  98 {
  99     target_ulong id;
 100     CPUState *env;
 101
 102     if (nargs != 1 || nret != 2) {
 103         rtas_st(rets, 0, -3);
 104         return;
 105     }
 106
 107     id = rtas_ld(args, 0);
 108     for (env = first_cpu; env; env = env->next_cpu) {
 109         if (env->cpu_index != id) {
 110             continue;
 111         }
 112
 113         if (env->halted) {
 114             rtas_st(rets, 1, 0);
 115         } else {
 116             rtas_st(rets, 1, 2);
 117         }
 118
 119         rtas_st(rets, 0, 0);
 120         return;
 121     }
 122
 123     /* Didn't find a matching cpu */
 124     rtas_st(rets, 0, -3);
 125 }
 126
 127 static void rtas_start_cpu(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, start, r3;
 133     CPUState *env;
 134
 135     if (nargs != 3 || nret != 1) {
 136         rtas_st(rets, 0, -3);
 137         return;
 138     }
 139
 140     id = rtas_ld(args, 0);
 141     start = rtas_ld(args, 1);
 142     r3 = rtas_ld(args, 2);
 143
 144     for (env = first_cpu; env; env = env->next_cpu) {
 145         if (env->cpu_index != id) {
 146             continue;
 147         }
 148
 149         if (!env->halted) {
 150             rtas_st(rets, 0, -1);
 151             return;
 152         }
 153
 154         env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
 155         env->nip = start;
 156         env->gpr[3] = r3;
 157         env->halted = 0;
 158
 159         qemu_cpu_kick(env);
 160
 161         rtas_st(rets, 0, 0);
 162         return;
 163     }
 164
 165     /* Didn't find a matching cpu */
 166     rtas_st(rets, 0, -3);
 167 }
 168
 169 static struct rtas_call {
 170     const char *name;
 171     spapr_rtas_fn fn;
 172 } rtas_table[TOKEN_MAX];
 173
 174 struct rtas_call *rtas_next = rtas_table;
 175
 176 target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
 177                              uint32_t token, uint32_t nargs, target_ulong args,
 178                              uint32_t nret, target_ulong rets)
 179 {
 180     if ((token >= TOKEN_BASE)
 181         && ((token - TOKEN_BASE) < TOKEN_MAX)) {
 182         struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
 183
 184         if (call->fn) {
 185             call->fn(spapr, token, nargs, args, nret, rets);
 186             return H_SUCCESS;
 187         }
 188     }
 189
 190     /* HACK: Some Linux early debug code uses RTAS display-character,
 191      * but assumes the token value is 0xa (which it is on some real
 192      * machines) without looking it up in the device tree.  This
 193      * special case makes this work */
 194     if (token == 0xa) {
 195         rtas_display_character(spapr, 0xa, nargs, args, nret, rets);
 196         return H_SUCCESS;
 197     }
 198
 199     hcall_dprintf("Unknown RTAS token 0x%x\n", token);
 200     rtas_st(rets, 0, -3);
 201     return H_PARAMETER;
 202 }
 203
 204 void spapr_rtas_register(const char *name, spapr_rtas_fn fn)
 205 {
 206     assert(rtas_next < (rtas_table + TOKEN_MAX));
 207
 208     rtas_next->name = name;
 209     rtas_next->fn = fn;
 210
 211     rtas_next++;
 212 }
 213
 214 int spapr_rtas_device_tree_setup(void *fdt, target_phys_addr_t rtas_addr,
 215                                  target_phys_addr_t rtas_size)
 216 {
 217     int ret;
 218     int i;
 219
 220     ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
 221     if (ret < 0) {
 222         fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
 223                 fdt_strerror(ret));
 224         return ret;
 225     }
 226
 227     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base",
 228                                     rtas_addr);
 229     if (ret < 0) {
 230         fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
 231                 fdt_strerror(ret));
 232         return ret;
 233     }
 234
 235     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
 236                                     rtas_addr);
 237     if (ret < 0) {
 238         fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
 239                 fdt_strerror(ret));
 240         return ret;
 241     }
 242
 243     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size",
 244                                     rtas_size);
 245     if (ret < 0) {
 246         fprintf(stderr, "Couldn't add rtas-size property: %s\n",
 247                 fdt_strerror(ret));
 248         return ret;
 249     }
 250
 251     for (i = 0; i < TOKEN_MAX; i++) {
 252         struct rtas_call *call = &rtas_table[i];
 253
 254         if (!call->fn) {
 255             continue;
 256         }
 257
 258         ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
 259                                         i + TOKEN_BASE);
 260         if (ret < 0) {
 261             fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
 262                     call->name, fdt_strerror(ret));
 263             return ret;
 264         }
 265
 266     }
 267     return 0;
 268 }
 269
 270 static void register_core_rtas(void)
 271 {
 272     spapr_rtas_register("display-character", rtas_display_character);
 273     spapr_rtas_register("get-time-of-day", rtas_get_time_of_day);
 274     spapr_rtas_register("power-off", rtas_power_off);
 275     spapr_rtas_register("query-cpu-stopped-state",
 276                         rtas_query_cpu_stopped_state);
 277     spapr_rtas_register("start-cpu", rtas_start_cpu);
 278 }
 279 device_init(register_core_rtas);