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