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; 194 195 spapr_rtas_register(RTAS_GET_TIME_OF_DAY, "get-time-of-day", 196 rtas_get_time_of_day); 197 spapr_rtas_register(RTAS_SET_TIME_OF_DAY, "set-time-of-day", 198 rtas_set_time_of_day); 199 } 200 201 static const TypeInfo spapr_rtc_info = { 202 .name = TYPE_SPAPR_RTC, 203 .parent = TYPE_SYS_BUS_DEVICE, 204 .instance_size = sizeof(sPAPRRTCState), 205 .class_init = spapr_rtc_class_init, 206 }; 207 208 static void spapr_rtc_register_types(void) 209 { 210 type_register_static(&spapr_rtc_info); 211 } 212 type_init(spapr_rtc_register_types) 213