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