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 #define SPAPR_RTC(obj) \
  37     OBJECT_CHECK(sPAPRRTCState, (obj), TYPE_SPAPR_RTC)
  38
  39 typedef struct sPAPRRTCState sPAPRRTCState;
  40 struct sPAPRRTCState {
  41     /*< private >*/
  42     SysBusDevice parent_obj;
  43     int64_t ns_offset;
  44 };
  45
  46 void spapr_rtc_read(DeviceState *dev, struct tm *tm, uint32_t *ns)
  47 {
  48     sPAPRRTCState *rtc = SPAPR_RTC(dev);
  49     int64_t host_ns = qemu_clock_get_ns(rtc_clock);
  50     int64_t guest_ns;
  51     time_t guest_s;
  52
  53     assert(rtc);
  54
  55     guest_ns = host_ns + rtc->ns_offset;
  56     guest_s = guest_ns / NANOSECONDS_PER_SECOND;
  57
  58     if (tm) {
  59         gmtime_r(&guest_s, tm);
  60     }
  61     if (ns) {
  62         *ns = guest_ns;
  63     }
  64 }
  65
  66 int spapr_rtc_import_offset(DeviceState *dev, int64_t legacy_offset)
  67 {
  68     sPAPRRTCState *rtc;
  69
  70     if (!dev) {
  71         return -ENODEV;
  72     }
  73
  74     rtc = SPAPR_RTC(dev);
  75
  76     rtc->ns_offset = legacy_offset * NANOSECONDS_PER_SECOND;
  77
  78     return 0;
  79 }
  80
  81 static void rtas_get_time_of_day(PowerPCCPU *cpu, sPAPRMachineState *spapr,
  82                                  uint32_t token, uint32_t nargs,
  83                                  target_ulong args,
  84                                  uint32_t nret, target_ulong rets)
  85 {
  86     struct tm tm;
  87     uint32_t ns;
  88
  89     if ((nargs != 0) || (nret != 8)) {
  90         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  91         return;
  92     }
  93
  94     if (!spapr->rtc) {
  95         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
  96         return;
  97     }
  98
  99     spapr_rtc_read(spapr->rtc, &tm, &ns);
 100
 101     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 102     rtas_st(rets, 1, tm.tm_year + 1900);
 103     rtas_st(rets, 2, tm.tm_mon + 1);
 104     rtas_st(rets, 3, tm.tm_mday);
 105     rtas_st(rets, 4, tm.tm_hour);
 106     rtas_st(rets, 5, tm.tm_min);
 107     rtas_st(rets, 6, tm.tm_sec);
 108     rtas_st(rets, 7, ns);
 109 }
 110
 111 static void rtas_set_time_of_day(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 112                                  uint32_t token, uint32_t nargs,
 113                                  target_ulong args,
 114                                  uint32_t nret, target_ulong rets)
 115 {
 116     sPAPRRTCState *rtc;
 117     struct tm tm;
 118     time_t new_s;
 119     int64_t host_ns;
 120
 121     if ((nargs != 7) || (nret != 1)) {
 122         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 123         return;
 124     }
 125
 126     if (!spapr->rtc) {
 127         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 128         return;
 129     }
 130
 131     tm.tm_year = rtas_ld(args, 0) - 1900;
 132     tm.tm_mon = rtas_ld(args, 1) - 1;
 133     tm.tm_mday = rtas_ld(args, 2);
 134     tm.tm_hour = rtas_ld(args, 3);
 135     tm.tm_min = rtas_ld(args, 4);
 136     tm.tm_sec = rtas_ld(args, 5);
 137
 138     new_s = mktimegm(&tm);
 139     if (new_s == -1) {
 140         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 141         return;
 142     }
 143
 144     /* Generate a monitor event for the change */
 145     qapi_event_send_rtc_change(qemu_timedate_diff(&tm), &error_abort);
 146
 147     rtc = SPAPR_RTC(spapr->rtc);
 148
 149     host_ns = qemu_clock_get_ns(rtc_clock);
 150
 151     rtc->ns_offset = (new_s * NANOSECONDS_PER_SECOND) - host_ns;
 152
 153     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 154 }
 155
 156 static void spapr_rtc_qom_date(Object *obj, struct tm *current_tm, Error **errp)
 157 {
 158     spapr_rtc_read(DEVICE(obj), current_tm, NULL);
 159 }
 160
 161 static void spapr_rtc_realize(DeviceState *dev, Error **errp)
 162 {
 163     sPAPRRTCState *rtc = SPAPR_RTC(dev);
 164     struct tm tm;
 165     time_t host_s;
 166     int64_t rtc_ns;
 167
 168     /* Initialize the RTAS RTC from host time */
 169
 170     qemu_get_timedate(&tm, 0);
 171     host_s = mktimegm(&tm);
 172     rtc_ns = qemu_clock_get_ns(rtc_clock);
 173     rtc->ns_offset = host_s * NANOSECONDS_PER_SECOND - rtc_ns;
 174
 175     object_property_add_tm(OBJECT(rtc), "date", spapr_rtc_qom_date, NULL);
 176 }
 177
 178 static const VMStateDescription vmstate_spapr_rtc = {
 179     .name = "spapr/rtc",
 180     .version_id = 1,
 181     .minimum_version_id = 1,
 182     .fields = (VMStateField[]) {
 183         VMSTATE_INT64(ns_offset, sPAPRRTCState),
 184         VMSTATE_END_OF_LIST()
 185     },
 186 };
 187
 188 static void spapr_rtc_class_init(ObjectClass *oc, void *data)
 189 {
 190     DeviceClass *dc = DEVICE_CLASS(oc);
 191
 192     dc->realize = spapr_rtc_realize;
 193     dc->vmsd = &vmstate_spapr_rtc;
 194     /* Reason: This is an internal device only for handling the hypercalls */
 195     dc->user_creatable = false;
 196
 197     spapr_rtas_register(RTAS_GET_TIME_OF_DAY, "get-time-of-day",
 198                         rtas_get_time_of_day);
 199     spapr_rtas_register(RTAS_SET_TIME_OF_DAY, "set-time-of-day",
 200                         rtas_set_time_of_day);
 201 }
 202
 203 static const TypeInfo spapr_rtc_info = {
 204     .name          = TYPE_SPAPR_RTC,
 205     .parent        = TYPE_SYS_BUS_DEVICE,
 206     .instance_size = sizeof(sPAPRRTCState),
 207     .class_init    = spapr_rtc_class_init,
 208 };
 209
 210 static void spapr_rtc_register_types(void)
 211 {
 212     type_register_static(&spapr_rtc_info);
 213 }
 214 type_init(spapr_rtc_register_types)