LXR qemu/hw/spapr

   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
  41static 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
  57static 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
  81static 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
 102static 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
 114static 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
 127static 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
 160static 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    CPUState *cpu;
 167    CPUPPCState *env;
 168
 169    if (nargs != 3 || nret != 1) {
 170        rtas_st(rets, 0, -3);
 171        return;
 172    }
 173
 174    id = rtas_ld(args, 0);
 175    start = rtas_ld(args, 1);
 176    r3 = rtas_ld(args, 2);
 177
 178    for (env = first_cpu; env; env = env->next_cpu) {
 179        cpu = ENV_GET_CPU(env);
 180
 181        if (env->cpu_index != id) {
 182            continue;
 183        }
 184
 185        if (!env->halted) {
 186            rtas_st(rets, 0, -1);
 187            return;
 188        }
 189
 190        /* This will make sure qemu state is up to date with kvm, and
 191         * mark it dirty so our changes get flushed back before the
 192         * new cpu enters */
 193        kvm_cpu_synchronize_state(env);
 194
 195        env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
 196        env->nip = start;
 197        env->gpr[3] = r3;
 198        env->halted = 0;
 199
 200        qemu_cpu_kick(cpu);
 201
 202        rtas_st(rets, 0, 0);
 203        return;
 204    }
 205
 206    /* Didn't find a matching cpu */
 207    rtas_st(rets, 0, -3);
 208}
 209
 210static struct rtas_call {
 211    const char *name;
 212    spapr_rtas_fn fn;
 213} rtas_table[TOKEN_MAX];
 214
 215struct rtas_call *rtas_next = rtas_table;
 216
 217target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
 218                             uint32_t token, uint32_t nargs, target_ulong args,
 219                             uint32_t nret, target_ulong rets)
 220{
 221    if ((token >= TOKEN_BASE)
 222        && ((token - TOKEN_BASE) < TOKEN_MAX)) {
 223        struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
 224
 225        if (call->fn) {
 226            call->fn(spapr, token, nargs, args, nret, rets);
 227            return H_SUCCESS;
 228        }
 229    }
 230
 231    /* HACK: Some Linux early debug code uses RTAS display-character,
 232     * but assumes the token value is 0xa (which it is on some real
 233     * machines) without looking it up in the device tree.  This
 234     * special case makes this work */
 235    if (token == 0xa) {
 236        rtas_display_character(spapr, 0xa, nargs, args, nret, rets);
 237        return H_SUCCESS;
 238    }
 239
 240    hcall_dprintf("Unknown RTAS token 0x%x\n", token);
 241    rtas_st(rets, 0, -3);
 242    return H_PARAMETER;
 243}
 244
 245void spapr_rtas_register(const char *name, spapr_rtas_fn fn)
 246{
 247    int i;
 248
 249    for (i = 0; i < (rtas_next - rtas_table); i++) {
 250        if (strcmp(name, rtas_table[i].name) == 0) {
 251            fprintf(stderr, "RTAS call \"%s\" registered twice\n", name);
 252            exit(1);
 253        }
 254    }
 255
 256    assert(rtas_next < (rtas_table + TOKEN_MAX));
 257
 258    rtas_next->name = name;
 259    rtas_next->fn = fn;
 260
 261    rtas_next++;
 262}
 263
 264int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
 265                                 hwaddr rtas_size)
 266{
 267    int ret;
 268    int i;
 269
 270    ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
 271    if (ret < 0) {
 272        fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
 273                fdt_strerror(ret));
 274        return ret;
 275    }
 276
 277    ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base",
 278                                    rtas_addr);
 279    if (ret < 0) {
 280        fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
 281                fdt_strerror(ret));
 282        return ret;
 283    }
 284
 285    ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
 286                                    rtas_addr);
 287    if (ret < 0) {
 288        fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
 289                fdt_strerror(ret));
 290        return ret;
 291    }
 292
 293    ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size",
 294                                    rtas_size);
 295    if (ret < 0) {
 296        fprintf(stderr, "Couldn't add rtas-size property: %s\n",
 297                fdt_strerror(ret));
 298        return ret;
 299    }
 300
 301    for (i = 0; i < TOKEN_MAX; i++) {
 302        struct rtas_call *call = &rtas_table[i];
 303
 304        if (!call->fn) {
 305            continue;
 306        }
 307
 308        ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
 309                                        i + TOKEN_BASE);
 310        if (ret < 0) {
 311            fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
 312                    call->name, fdt_strerror(ret));
 313            return ret;
 314        }
 315
 316    }
 317    return 0;
 318}
 319
 320static void core_rtas_register_types(void)
 321{
 322    spapr_rtas_register("display-character", rtas_display_character);
 323    spapr_rtas_register("get-time-of-day", rtas_get_time_of_day);
 324    spapr_rtas_register("set-time-of-day", rtas_set_time_of_day);
 325    spapr_rtas_register("power-off", rtas_power_off);
 326    spapr_rtas_register("system-reboot", rtas_system_reboot);
 327    spapr_rtas_register("query-cpu-stopped-state",
 328                        rtas_query_cpu_stopped_state);
 329    spapr_rtas_register("start-cpu", rtas_start_cpu);
 330}
 331
 332type_init(core_rtas_register_types)
 333