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