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 = spapr_vio_find_by_reg(spapr->vio_bus,
  48                                                 SPAPR_VTY_BASE_ADDRESS);
  49
  50    if (!sdev) {
  51        rtas_st(rets, 0, -1);
  52    } else {
  53        vty_putchars(sdev, &c, sizeof(c));
  54        rtas_st(rets, 0, 0);
  55    }
  56}
  57
  58static void rtas_get_time_of_day(sPAPREnvironment *spapr,
  59                                 uint32_t token, uint32_t nargs,
  60                                 target_ulong args,
  61                                 uint32_t nret, target_ulong rets)
  62{
  63    struct tm tm;
  64
  65    if (nret != 8) {
  66        rtas_st(rets, 0, -3);
  67        return;
  68    }
  69
  70    qemu_get_timedate(&tm, spapr->rtc_offset);
  71
  72    rtas_st(rets, 0, 0); /* Success */
  73    rtas_st(rets, 1, tm.tm_year + 1900);
  74    rtas_st(rets, 2, tm.tm_mon + 1);
  75    rtas_st(rets, 3, tm.tm_mday);
  76    rtas_st(rets, 4, tm.tm_hour);
  77    rtas_st(rets, 5, tm.tm_min);
  78    rtas_st(rets, 6, tm.tm_sec);
  79    rtas_st(rets, 7, 0); /* we don't do nanoseconds */
  80}
  81
  82static void rtas_set_time_of_day(sPAPREnvironment *spapr,
  83                                 uint32_t token, uint32_t nargs,
  84                                 target_ulong args,
  85                                 uint32_t nret, target_ulong rets)
  86{
  87    struct tm tm;
  88
  89    tm.tm_year = rtas_ld(args, 0) - 1900;
  90    tm.tm_mon = rtas_ld(args, 1) - 1;
  91    tm.tm_mday = rtas_ld(args, 2);
  92    tm.tm_hour = rtas_ld(args, 3);
  93    tm.tm_min = rtas_ld(args, 4);
  94    tm.tm_sec = rtas_ld(args, 5);
  95
  96    /* Just generate a monitor event for the change */
  97    rtc_change_mon_event(&tm);
  98    spapr->rtc_offset = qemu_timedate_diff(&tm);
  99
 100    rtas_st(rets, 0, 0); /* Success */
 101}
 102
 103static void rtas_power_off(sPAPREnvironment *spapr,
 104                           uint32_t token, uint32_t nargs, target_ulong args,
 105                           uint32_t nret, target_ulong rets)
 106{
 107    if (nargs != 2 || nret != 1) {
 108        rtas_st(rets, 0, -3);
 109        return;
 110    }
 111    qemu_system_shutdown_request();
 112    rtas_st(rets, 0, 0);
 113}
 114
 115static void rtas_query_cpu_stopped_state(sPAPREnvironment *spapr,
 116                                         uint32_t token, uint32_t nargs,
 117                                         target_ulong args,
 118                                         uint32_t nret, target_ulong rets)
 119{
 120    target_ulong id;
 121    CPUState *env;
 122
 123    if (nargs != 1 || nret != 2) {
 124        rtas_st(rets, 0, -3);
 125        return;
 126    }
 127
 128    id = rtas_ld(args, 0);
 129    for (env = first_cpu; env; env = env->next_cpu) {
 130        if (env->cpu_index != id) {
 131            continue;
 132        }
 133
 134        if (env->halted) {
 135            rtas_st(rets, 1, 0);
 136        } else {
 137            rtas_st(rets, 1, 2);
 138        }
 139
 140        rtas_st(rets, 0, 0);
 141        return;
 142    }
 143
 144    /* Didn't find a matching cpu */
 145    rtas_st(rets, 0, -3);
 146}
 147
 148static void rtas_start_cpu(sPAPREnvironment *spapr,
 149                           uint32_t token, uint32_t nargs,
 150                           target_ulong args,
 151                           uint32_t nret, target_ulong rets)
 152{
 153    target_ulong id, start, r3;
 154    CPUState *env;
 155
 156    if (nargs != 3 || nret != 1) {
 157        rtas_st(rets, 0, -3);
 158        return;
 159    }
 160
 161    id = rtas_ld(args, 0);
 162    start = rtas_ld(args, 1);
 163    r3 = rtas_ld(args, 2);
 164
 165    for (env = first_cpu; env; env = env->next_cpu) {
 166        if (env->cpu_index != id) {
 167            continue;
 168        }
 169
 170        if (!env->halted) {
 171            rtas_st(rets, 0, -1);
 172            return;
 173        }
 174
 175        env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
 176        env->nip = start;
 177        env->gpr[3] = r3;
 178        env->halted = 0;
 179
 180        qemu_cpu_kick(env);
 181
 182        rtas_st(rets, 0, 0);
 183        return;
 184    }
 185
 186    /* Didn't find a matching cpu */
 187    rtas_st(rets, 0, -3);
 188}
 189
 190static struct rtas_call {
 191    const char *name;
 192    spapr_rtas_fn fn;
 193} rtas_table[TOKEN_MAX];
 194
 195struct rtas_call *rtas_next = rtas_table;
 196
 197target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
 198                             uint32_t token, uint32_t nargs, target_ulong args,
 199                             uint32_t nret, target_ulong rets)
 200{
 201    if ((token >= TOKEN_BASE)
 202        && ((token - TOKEN_BASE) < TOKEN_MAX)) {
 203        struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
 204
 205        if (call->fn) {
 206            call->fn(spapr, token, nargs, args, nret, rets);
 207            return H_SUCCESS;
 208        }
 209    }
 210
 211    /* HACK: Some Linux early debug code uses RTAS display-character,
 212     * but assumes the token value is 0xa (which it is on some real
 213     * machines) without looking it up in the device tree.  This
 214     * special case makes this work */
 215    if (token == 0xa) {
 216        rtas_display_character(spapr, 0xa, nargs, args, nret, rets);
 217        return H_SUCCESS;
 218    }
 219
 220    hcall_dprintf("Unknown RTAS token 0x%x\n", token);
 221    rtas_st(rets, 0, -3);
 222    return H_PARAMETER;
 223}
 224
 225void spapr_rtas_register(const char *name, spapr_rtas_fn fn)
 226{
 227    assert(rtas_next < (rtas_table + TOKEN_MAX));
 228
 229    rtas_next->name = name;
 230    rtas_next->fn = fn;
 231
 232    rtas_next++;
 233}
 234
 235int spapr_rtas_device_tree_setup(void *fdt, target_phys_addr_t rtas_addr,
 236                                 target_phys_addr_t rtas_size)
 237{
 238    int ret;
 239    int i;
 240
 241    ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
 242    if (ret < 0) {
 243        fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
 244                fdt_strerror(ret));
 245        return ret;
 246    }
 247
 248    ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base",
 249                                    rtas_addr);
 250    if (ret < 0) {
 251        fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
 252                fdt_strerror(ret));
 253        return ret;
 254    }
 255
 256    ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
 257                                    rtas_addr);
 258    if (ret < 0) {
 259        fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
 260                fdt_strerror(ret));
 261        return ret;
 262    }
 263
 264    ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size",
 265                                    rtas_size);
 266    if (ret < 0) {
 267        fprintf(stderr, "Couldn't add rtas-size property: %s\n",
 268                fdt_strerror(ret));
 269        return ret;
 270    }
 271
 272    for (i = 0; i < TOKEN_MAX; i++) {
 273        struct rtas_call *call = &rtas_table[i];
 274
 275        if (!call->fn) {
 276            continue;
 277        }
 278
 279        ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
 280                                        i + TOKEN_BASE);
 281        if (ret < 0) {
 282            fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
 283                    call->name, fdt_strerror(ret));
 284            return ret;
 285        }
 286
 287    }
 288    return 0;
 289}
 290
 291static void register_core_rtas(void)
 292{
 293    spapr_rtas_register("display-character", rtas_display_character);
 294    spapr_rtas_register("get-time-of-day", rtas_get_time_of_day);
 295    spapr_rtas_register("set-time-of-day", rtas_set_time_of_day);
 296    spapr_rtas_register("power-off", rtas_power_off);
 297    spapr_rtas_register("query-cpu-stopped-state",
 298                        rtas_query_cpu_stopped_state);
 299    spapr_rtas_register("start-cpu", rtas_start_cpu);
 300}
 301device_init(register_core_rtas);
 302