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