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, NULL); 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) 192