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 "cpu.h"
  29 #include "qemu/timer.h"
  30 #include "sysemu/sysemu.h"
  31 #include "hw/ppc/spapr.h"
  32 #include "qapi-event.h"
  33
  34 #define SPAPR_RTC(obj) \
  35     OBJECT_CHECK(sPAPRRTCState, (obj), TYPE_SPAPR_RTC)
  36
  37 typedef struct sPAPRRTCState sPAPRRTCState;
  38 struct sPAPRRTCState {
  39     /*< private >*/
  40     SysBusDevice parent_obj;
  41     int64_t ns_offset;
  42 };
  43
  44 void spapr_rtc_read(DeviceState *dev, struct tm *tm, uint32_t *ns)
  45 {
  46     sPAPRRTCState *rtc = SPAPR_RTC(dev);
  47     int64_t host_ns = qemu_clock_get_ns(rtc_clock);
  48     int64_t guest_ns;
  49     time_t guest_s;
  50
  51     assert(rtc);
  52
  53     guest_ns = host_ns + rtc->ns_offset;
  54     guest_s = guest_ns / NANOSECONDS_PER_SECOND;
  55
  56     if (tm) {
  57         gmtime_r(&guest_s, tm);
  58     }
  59     if (ns) {
  60         *ns = guest_ns;
  61     }
  62 }
  63
  64 int spapr_rtc_import_offset(DeviceState *dev, int64_t legacy_offset)
  65 {
  66     sPAPRRTCState *rtc;
  67
  68     if (!dev) {
  69         return -ENODEV;
  70     }
  71
  72     rtc = SPAPR_RTC(dev);
  73
  74     rtc->ns_offset = legacy_offset * NANOSECONDS_PER_SECOND;
  75
  76     return 0;
  77 }
  78
  79 static void rtas_get_time_of_day(PowerPCCPU *cpu, sPAPRMachineState *spapr,
  80                                  uint32_t token, uint32_t nargs,
  81                                  target_ulong args,
  82                                  uint32_t nret, target_ulong rets)
  83 {
  84     struct tm tm;
  85     uint32_t ns;
  86
  87     if ((nargs != 0) || (nret != 8)) {
  88         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  89         return;
  90     }
  91
  92     if (!spapr->rtc) {
  93         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
  94         return;
  95     }
  96
  97     spapr_rtc_read(spapr->rtc, &tm, &ns);
  98
  99     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 100     rtas_st(rets, 1, tm.tm_year + 1900);
 101     rtas_st(rets, 2, tm.tm_mon + 1);
 102     rtas_st(rets, 3, tm.tm_mday);
 103     rtas_st(rets, 4, tm.tm_hour);
 104     rtas_st(rets, 5, tm.tm_min);
 105     rtas_st(rets, 6, tm.tm_sec);
 106     rtas_st(rets, 7, ns);
 107 }
 108
 109 static void rtas_set_time_of_day(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 110                                  uint32_t token, uint32_t nargs,
 111                                  target_ulong args,
 112                                  uint32_t nret, target_ulong rets)
 113 {
 114     sPAPRRTCState *rtc;
 115     struct tm tm;
 116     time_t new_s;
 117     int64_t host_ns;
 118
 119     if ((nargs != 7) || (nret != 1)) {
 120         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 121         return;
 122     }
 123
 124     if (!spapr->rtc) {
 125         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 126         return;
 127     }
 128
 129     tm.tm_year = rtas_ld(args, 0) - 1900;
 130     tm.tm_mon = rtas_ld(args, 1) - 1;
 131     tm.tm_mday = rtas_ld(args, 2);
 132     tm.tm_hour = rtas_ld(args, 3);
 133     tm.tm_min = rtas_ld(args, 4);
 134     tm.tm_sec = rtas_ld(args, 5);
 135
 136     new_s = mktimegm(&tm);
 137     if (new_s == -1) {
 138         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 139         return;
 140     }
 141
 142     /* Generate a monitor event for the change */
 143     qapi_event_send_rtc_change(qemu_timedate_diff(&tm), &error_abort);
 144
 145     rtc = SPAPR_RTC(spapr->rtc);
 146
 147     host_ns = qemu_clock_get_ns(rtc_clock);
 148
 149     rtc->ns_offset = (new_s * NANOSECONDS_PER_SECOND) - host_ns;
 150
 151     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 152 }
 153
 154 static void spapr_rtc_qom_date(Object *obj, struct tm *current_tm, Error **errp)
 155 {
 156     spapr_rtc_read(DEVICE(obj), current_tm, NULL);
 157 }
 158
 159 static void spapr_rtc_realize(DeviceState *dev, Error **errp)
 160 {
 161     sPAPRRTCState *rtc = SPAPR_RTC(dev);
 162     struct tm tm;
 163     time_t host_s;
 164     int64_t rtc_ns;
 165
 166     /* Initialize the RTAS RTC from host time */
 167
 168     qemu_get_timedate(&tm, 0);
 169     host_s = mktimegm(&tm);
 170     rtc_ns = qemu_clock_get_ns(rtc_clock);
 171     rtc->ns_offset = host_s * NANOSECONDS_PER_SECOND - rtc_ns;
 172
 173     object_property_add_tm(OBJECT(rtc), "date", spapr_rtc_qom_date, NULL);
 174 }
 175
 176 static const VMStateDescription vmstate_spapr_rtc = {
 177     .name = "spapr/rtc",
 178     .version_id = 1,
 179     .minimum_version_id = 1,
 180     .fields = (VMStateField[]) {
 181         VMSTATE_INT64(ns_offset, sPAPRRTCState),
 182         VMSTATE_END_OF_LIST()
 183     },
 184 };
 185
 186 static void spapr_rtc_class_init(ObjectClass *oc, void *data)
 187 {
 188     DeviceClass *dc = DEVICE_CLASS(oc);
 189
 190     dc->realize = spapr_rtc_realize;
 191     dc->vmsd = &vmstate_spapr_rtc;
 192
 193     spapr_rtas_register(RTAS_GET_TIME_OF_DAY, "get-time-of-day",
 194                         rtas_get_time_of_day);
 195     spapr_rtas_register(RTAS_SET_TIME_OF_DAY, "set-time-of-day",
 196                         rtas_set_time_of_day);
 197 }
 198
 199 static const TypeInfo spapr_rtc_info = {
 200     .name          = TYPE_SPAPR_RTC,
 201     .parent        = TYPE_SYS_BUS_DEVICE,
 202     .instance_size = sizeof(sPAPRRTCState),
 203     .class_size = sizeof(XICSStateClass),
 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)