hw/ppc/spapr_rtc.c

   1 /*
   2  * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
   3  *
   4  * RTAS Real Time Clock
   5  *
   6  * Copyright (c) 2010-2011 David Gibson, IBM Corporation.
   7  * Copyright 2014 David Gibson, Red Hat.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  *
  27  */
  28 #include "qemu/osdep.h"
  29 #include "cpu.h"
  30 #include "qemu/timer.h"
  31 #include "sysemu/sysemu.h"
  32 #include "hw/ppc/spapr.h"
  33 #include "qapi-event.h"
  34
  35 #define SPAPR_RTC(obj) \
  36     OBJECT_CHECK(sPAPRRTCState, (obj), TYPE_SPAPR_RTC)
  37
  38 typedef struct sPAPRRTCState sPAPRRTCState;
  39 struct sPAPRRTCState {
  40     /*< private >*/
  41     SysBusDevice parent_obj;
  42     int64_t ns_offset;
  43 };
  44
  45 void spapr_rtc_read(DeviceState *dev, struct tm *tm, uint32_t *ns)
  46 {
  47     sPAPRRTCState *rtc = SPAPR_RTC(dev);
  48     int64_t host_ns = qemu_clock_get_ns(rtc_clock);
  49     int64_t guest_ns;
  50     time_t guest_s;
  51
  52     assert(rtc);
  53
  54     guest_ns = host_ns + rtc->ns_offset;
  55     guest_s = guest_ns / NANOSECONDS_PER_SECOND;
  56
  57     if (tm) {
  58         gmtime_r(&guest_s, tm);
  59     }
  60     if (ns) {
  61         *ns = guest_ns;
  62     }
  63 }
  64
  65 int spapr_rtc_import_offset(DeviceState *dev, int64_t legacy_offset)
  66 {
  67     sPAPRRTCState *rtc;
  68
  69     if (!dev) {
  70         return -ENODEV;
  71     }
  72
  73     rtc = SPAPR_RTC(dev);
  74
  75     rtc->ns_offset = legacy_offset * NANOSECONDS_PER_SECOND;
  76
  77     return 0;
  78 }
  79
  80 static void rtas_get_time_of_day(PowerPCCPU *cpu, sPAPRMachineState *spapr,
  81                                  uint32_t token, uint32_t nargs,
  82                                  target_ulong args,
  83                                  uint32_t nret, target_ulong rets)
  84 {
  85     struct tm tm;
  86     uint32_t ns;
  87
  88     if ((nargs != 0) || (nret != 8)) {
  89         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  90         return;
  91     }
  92
  93     if (!spapr->rtc) {
  94         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
  95         return;
  96     }
  97
  98     spapr_rtc_read(spapr->rtc, &tm, &ns);
  99
 100     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 101     rtas_st(rets, 1, tm.tm_year + 1900);
 102     rtas_st(rets, 2, tm.tm_mon + 1);
 103     rtas_st(rets, 3, tm.tm_mday);
 104     rtas_st(rets, 4, tm.tm_hour);
 105     rtas_st(rets, 5, tm.tm_min);
 106     rtas_st(rets, 6, tm.tm_sec);
 107     rtas_st(rets, 7, ns);
 108 }
 109
 110 static void rtas_set_time_of_day(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 111                                  uint32_t token, uint32_t nargs,
 112                                  target_ulong args,
 113                                  uint32_t nret, target_ulong rets)
 114 {
 115     sPAPRRTCState *rtc;
 116     struct tm tm;
 117     time_t new_s;
 118     int64_t host_ns;
 119
 120     if ((nargs != 7) || (nret != 1)) {
 121         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 122         return;
 123     }
 124
 125     if (!spapr->rtc) {
 126         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 127         return;
 128     }
 129
 130     tm.tm_year = rtas_ld(args, 0) - 1900;
 131     tm.tm_mon = rtas_ld(args, 1) - 1;
 132     tm.tm_mday = rtas_ld(args, 2);
 133     tm.tm_hour = rtas_ld(args, 3);
 134     tm.tm_min = rtas_ld(args, 4);
 135     tm.tm_sec = rtas_ld(args, 5);
 136
 137     new_s = mktimegm(&tm);
 138     if (new_s == -1) {
 139         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 140         return;
 141     }
 142
 143     /* Generate a monitor event for the change */
 144     qapi_event_send_rtc_change(qemu_timedate_diff(&tm), &error_abort);
 145
 146     rtc = SPAPR_RTC(spapr->rtc);
 147
 148     host_ns = qemu_clock_get_ns(rtc_clock);
 149
 150     rtc->ns_offset = (new_s * NANOSECONDS_PER_SECOND) - host_ns;
 151
 152     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 153 }
 154
 155 static void spapr_rtc_qom_date(Object *obj, struct tm *current_tm, Error **errp)
 156 {
 157     spapr_rtc_read(DEVICE(obj), current_tm, NULL);
 158 }
 159
 160 static void spapr_rtc_realize(DeviceState *dev, Error **errp)
 161 {
 162     sPAPRRTCState *rtc = SPAPR_RTC(dev);
 163     struct tm tm;
 164     time_t host_s;
 165     int64_t rtc_ns;
 166
 167     /* Initialize the RTAS RTC from host time */
 168
 169     qemu_get_timedate(&tm, 0);
 170     host_s = mktimegm(&tm);
 171     rtc_ns = qemu_clock_get_ns(rtc_clock);
 172     rtc->ns_offset = host_s * NANOSECONDS_PER_SECOND - rtc_ns;
 173
 174     object_property_add_tm(OBJECT(rtc), "date", spapr_rtc_qom_date, NULL);
 175 }
 176
 177 static const VMStateDescription vmstate_spapr_rtc = {
 178     .name = "spapr/rtc",
 179     .version_id = 1,
 180     .minimum_version_id = 1,
 181     .fields = (VMStateField[]) {
 182         VMSTATE_INT64(ns_offset, sPAPRRTCState),
 183         VMSTATE_END_OF_LIST()
 184     },
 185 };
 186
 187 static void spapr_rtc_class_init(ObjectClass *oc, void *data)
 188 {
 189     DeviceClass *dc = DEVICE_CLASS(oc);
 190
 191     dc->realize = spapr_rtc_realize;
 192     dc->vmsd = &vmstate_spapr_rtc;
 193
 194     spapr_rtas_register(RTAS_GET_TIME_OF_DAY, "get-time-of-day",
 195                         rtas_get_time_of_day);
 196     spapr_rtas_register(RTAS_SET_TIME_OF_DAY, "set-time-of-day",
 197                         rtas_set_time_of_day);
 198 }
 199
 200 static const TypeInfo spapr_rtc_info = {
 201     .name          = TYPE_SPAPR_RTC,
 202     .parent        = TYPE_SYS_BUS_DEVICE,
 203     .instance_size = sizeof(sPAPRRTCState),
 204     .class_init    = spapr_rtc_class_init,
 205 };
 206
 207 static void spapr_rtc_register_types(void)
 208 {
 209     type_register_static(&spapr_rtc_info);
 210 }
 211 type_init(spapr_rtc_register_types)