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, 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, 0);
  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_power_off(sPAPREnvironment *spapr,
  82                            uint32_t token, uint32_t nargs, target_ulong args,
  83                            uint32_t nret, target_ulong rets)
  84 {
  85     if (nargs != 2 || nret != 1) {
  86         rtas_st(rets, 0, -3);
  87         return;
  88     }
  89     qemu_system_shutdown_request();
  90     rtas_st(rets, 0, 0);
  91 }
  92
  93 static void rtas_query_cpu_stopped_state(sPAPREnvironment *spapr,
  94                                          uint32_t token, uint32_t nargs,
  95                                          target_ulong args,
  96                                          uint32_t nret, target_ulong rets)
  97 {
  98     target_ulong id;
  99     CPUState *env;
 100
 101     if (nargs != 1 || nret != 2) {
 102         rtas_st(rets, 0, -3);
 103         return;
 104     }
 105
 106     id = rtas_ld(args, 0);
 107     for (env = first_cpu; env; env = env->next_cpu) {
 108         if (env->cpu_index != id) {
 109             continue;
 110         }
 111
 112         if (env->halted) {
 113             rtas_st(rets, 1, 0);
 114         } else {
 115             rtas_st(rets, 1, 2);
 116         }
 117
 118         rtas_st(rets, 0, 0);
 119         return;
 120     }
 121
 122     /* Didn't find a matching cpu */
 123     rtas_st(rets, 0, -3);
 124 }
 125
 126 static void rtas_start_cpu(sPAPREnvironment *spapr,
 127                            uint32_t token, uint32_t nargs,
 128                            target_ulong args,
 129                            uint32_t nret, target_ulong rets)
 130 {
 131     target_ulong id, start, r3;
 132     CPUState *env;
 133
 134     if (nargs != 3 || nret != 1) {
 135         rtas_st(rets, 0, -3);
 136         return;
 137     }
 138
 139     id = rtas_ld(args, 0);
 140     start = rtas_ld(args, 1);
 141     r3 = rtas_ld(args, 2);
 142
 143     for (env = first_cpu; env; env = env->next_cpu) {
 144         if (env->cpu_index != id) {
 145             continue;
 146         }
 147
 148         if (!env->halted) {
 149             rtas_st(rets, 0, -1);
 150             return;
 151         }
 152
 153         env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
 154         env->nip = start;
 155         env->gpr[3] = r3;
 156         env->halted = 0;
 157
 158         qemu_cpu_kick(env);
 159
 160         rtas_st(rets, 0, 0);
 161         return;
 162     }
 163
 164     /* Didn't find a matching cpu */
 165     rtas_st(rets, 0, -3);
 166 }
 167
 168 static struct rtas_call {
 169     const char *name;
 170     spapr_rtas_fn fn;
 171 } rtas_table[TOKEN_MAX];
 172
 173 struct rtas_call *rtas_next = rtas_table;
 174
 175 target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
 176                              uint32_t token, uint32_t nargs, target_ulong args,
 177                              uint32_t nret, target_ulong rets)
 178 {
 179     if ((token >= TOKEN_BASE)
 180         && ((token - TOKEN_BASE) < TOKEN_MAX)) {
 181         struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
 182
 183         if (call->fn) {
 184             call->fn(spapr, token, nargs, args, nret, rets);
 185             return H_SUCCESS;
 186         }
 187     }
 188
 189     /* HACK: Some Linux early debug code uses RTAS display-character,
 190      * but assumes the token value is 0xa (which it is on some real
 191      * machines) without looking it up in the device tree.  This
 192      * special case makes this work */
 193     if (token == 0xa) {
 194         rtas_display_character(spapr, 0xa, nargs, args, nret, rets);
 195         return H_SUCCESS;
 196     }
 197
 198     hcall_dprintf("Unknown RTAS token 0x%x\n", token);
 199     rtas_st(rets, 0, -3);
 200     return H_PARAMETER;
 201 }
 202
 203 void spapr_rtas_register(const char *name, spapr_rtas_fn fn)
 204 {
 205     assert(rtas_next < (rtas_table + TOKEN_MAX));
 206
 207     rtas_next->name = name;
 208     rtas_next->fn = fn;
 209
 210     rtas_next++;
 211 }
 212
 213 int spapr_rtas_device_tree_setup(void *fdt, target_phys_addr_t rtas_addr,
 214                                  target_phys_addr_t rtas_size)
 215 {
 216     int ret;
 217     int i;
 218
 219     ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
 220     if (ret < 0) {
 221         fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
 222                 fdt_strerror(ret));
 223         return ret;
 224     }
 225
 226     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base",
 227                                     rtas_addr);
 228     if (ret < 0) {
 229         fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
 230                 fdt_strerror(ret));
 231         return ret;
 232     }
 233
 234     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
 235                                     rtas_addr);
 236     if (ret < 0) {
 237         fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
 238                 fdt_strerror(ret));
 239         return ret;
 240     }
 241
 242     ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size",
 243                                     rtas_size);
 244     if (ret < 0) {
 245         fprintf(stderr, "Couldn't add rtas-size property: %s\n",
 246                 fdt_strerror(ret));
 247         return ret;
 248     }
 249
 250     for (i = 0; i < TOKEN_MAX; i++) {
 251         struct rtas_call *call = &rtas_table[i];
 252
 253         if (!call->fn) {
 254             continue;
 255         }
 256
 257         ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
 258                                         i + TOKEN_BASE);
 259         if (ret < 0) {
 260             fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
 261                     call->name, fdt_strerror(ret));
 262             return ret;
 263         }
 264
 265     }
 266     return 0;
 267 }
 268
 269 static void register_core_rtas(void)
 270 {
 271     spapr_rtas_register("display-character", rtas_display_character);
 272     spapr_rtas_register("get-time-of-day", rtas_get_time_of_day);
 273     spapr_rtas_register("power-off", rtas_power_off);
 274     spapr_rtas_register("query-cpu-stopped-state",
 275                         rtas_query_cpu_stopped_state);
 276     spapr_rtas_register("start-cpu", rtas_start_cpu);
 277 }
 278 device_init(register_core_rtas);