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