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/sysemu.h"
  29#include "char/char.h"
  30#include "hw/qdev.h"
  31#include "sysemu/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    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    for (env = first_cpu; env; env = env->next_cpu) {
 143        cpu = CPU(ppc_env_get_cpu(env));
 144        if (cpu->cpu_index != id) {
 145            continue;
 146        }
 147
 148        if (env->halted) {
 149            rtas_st(rets, 1, 0);
 150        } else {
 151            rtas_st(rets, 1, 2);
 152        }
 153
 154        rtas_st(rets, 0, 0);
 155        return;
 156    }
 157
 158    /* Didn't find a matching cpu */
 159    rtas_st(rets, 0, -3);
 160}
 161
 162static void rtas_start_cpu(sPAPREnvironment *spapr,
 163                           uint32_t token, uint32_t nargs,
 164                           target_ulong args,
 165                           uint32_t nret, target_ulong rets)
 166{
 167    target_ulong id, start, r3;
 168    CPUState *cpu;
 169    CPUPPCState *env;
 170
 171    if (nargs != 3 || nret != 1) {
 172        rtas_st(rets, 0, -3);
 173        return;
 174    }
 175
 176    id = rtas_ld(args, 0);
 177    start = rtas_ld(args, 1);
 178    r3 = rtas_ld(args, 2);
 179
 180    for (env = first_cpu; env; env = env->next_cpu) {
 181        cpu = CPU(ppc_env_get_cpu(env));
 182
 183        if (cpu->cpu_index != id) {
 184            continue;
 185        }
 186
 187        if (!env->halted) {
 188            rtas_st(rets, 0, -1);
 189            return;
 190        }
 191
 192        /* This will make sure qemu state is up to date with kvm, and
 193         * mark it dirty so our changes get flushed back before the
 194         * new cpu enters */
 195        kvm_cpu_synchronize_state(env);
 196
 197        env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
 198        env->nip = start;
 199        env->gpr[3] = r3;
 200        env->halted = 0;
 201
 202        qemu_cpu_kick(cpu);
 203
 204        rtas_st(rets, 0, 0);
 205        return;
 206    }
 207
 208    /* Didn't find a matching cpu */
 209    rtas_st(rets, 0, -3);
 210}
 211
 212static struct rtas_call {
 213    const char *name;
 214    spapr_rtas_fn fn;
 215} rtas_table[TOKEN_MAX];
 216
 217struct rtas_call *rtas_next = rtas_table;
 218
 219target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
 220                             uint32_t token, uint32_t nargs, target_ulong args,
 221                             uint32_t nret, target_ulong rets)
 222{
 223    if ((token >= TOKEN_BASE)
 224        && ((token - TOKEN_BASE) < TOKEN_MAX)) {
 225        struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
 226
 227        if (call->fn) {
 228            call->fn(spapr, token, nargs, args, nret, rets);
 229            return H_SUCCESS;
 230        }
 231    }
 232
 233    /* HACK: Some Linux early debug code uses RTAS display-character,
 234     * but assumes the token value is 0xa (which it is on some real
 235     * machines) without looking it up in the device tree.  This
 236     * special case makes this work */
 237    if (token == 0xa) {
 238        rtas_display_character(spapr, 0xa, nargs, args, nret, rets);
 239        return H_SUCCESS;
 240    }
 241
 242    hcall_dprintf("Unknown RTAS token 0x%x\n", token);
 243    rtas_st(rets, 0, -3);
 244    return H_PARAMETER;
 245}
 246
 247int spapr_rtas_register(const char *name, spapr_rtas_fn fn)
 248{
 249    int i;
 250
 251    for (i = 0; i < (rtas_next - rtas_table); i++) {
 252        if (strcmp(name, rtas_table[i].name) == 0) {
 253            fprintf(stderr, "RTAS call \"%s\" registered twice\n", name);
 254            exit(1);
 255        }
 256    }
 257
 258    assert(rtas_next < (rtas_table + TOKEN_MAX));
 259
 260    rtas_next->name = name;
 261    rtas_next->fn = fn;
 262
 263    return (rtas_next++ - rtas_table) + TOKEN_BASE;
 264}
 265
 266int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
 267                                 hwaddr rtas_size)
 268{
 269    int ret;
 270    int i;
 271
 272    ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
 273    if (ret < 0) {
 274        fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
 275                fdt_strerror(ret));
 276        return ret;
 277    }
 278
 279    ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base",
 280                                    rtas_addr);
 281    if (ret < 0) {
 282        fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
 283                fdt_strerror(ret));
 284        return ret;
 285    }
 286
 287    ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
 288                                    rtas_addr);
 289    if (ret < 0) {
 290        fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
 291                fdt_strerror(ret));
 292        return ret;
 293    }
 294
 295    ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size",
 296                                    rtas_size);
 297    if (ret < 0) {
 298        fprintf(stderr, "Couldn't add rtas-size property: %s\n",
 299                fdt_strerror(ret));
 300        return ret;
 301    }
 302
 303    for (i = 0; i < TOKEN_MAX; i++) {
 304        struct rtas_call *call = &rtas_table[i];
 305
 306        if (!call->name) {
 307            continue;
 308        }
 309
 310        ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
 311                                        i + TOKEN_BASE);
 312        if (ret < 0) {
 313            fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
 314                    call->name, fdt_strerror(ret));
 315            return ret;
 316        }
 317
 318    }
 319    return 0;
 320}
 321
 322static void core_rtas_register_types(void)
 323{
 324    spapr_rtas_register("display-character", rtas_display_character);
 325    spapr_rtas_register("get-time-of-day", rtas_get_time_of_day);
 326    spapr_rtas_register("set-time-of-day", rtas_set_time_of_day);
 327    spapr_rtas_register("power-off", rtas_power_off);
 328    spapr_rtas_register("system-reboot", rtas_system_reboot);
 329    spapr_rtas_register("query-cpu-stopped-state",
 330                        rtas_query_cpu_stopped_state);
 331    spapr_rtas_register("start-cpu", rtas_start_cpu);
 332}
 333
 334type_init(core_rtas_register_types)
 335