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