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