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) 190