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