diff options
Diffstat (limited to 'qemu/hw/ppc/spapr_rtc.c')
| -rw-r--r-- | qemu/hw/ppc/spapr_rtc.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/qemu/hw/ppc/spapr_rtc.c b/qemu/hw/ppc/spapr_rtc.c new file mode 100644 index 000000000..34b27db70 --- /dev/null +++ b/qemu/hw/ppc/spapr_rtc.c @@ -0,0 +1,211 @@ +/* + * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator + * + * RTAS Real Time Clock + * + * Copyright (c) 2010-2011 David Gibson, IBM Corporation. + * Copyright 2014 David Gibson, Red Hat. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + * + */ +#include "cpu.h" +#include "qemu/timer.h" +#include "sysemu/sysemu.h" +#include "hw/ppc/spapr.h" +#include "qapi-event.h" + +#define SPAPR_RTC(obj) \ + OBJECT_CHECK(sPAPRRTCState, (obj), TYPE_SPAPR_RTC) + +typedef struct sPAPRRTCState sPAPRRTCState; +struct sPAPRRTCState { + /*< private >*/ + SysBusDevice parent_obj; + int64_t ns_offset; +}; + +void spapr_rtc_read(DeviceState *dev, struct tm *tm, uint32_t *ns) +{ + sPAPRRTCState *rtc = SPAPR_RTC(dev); + int64_t host_ns = qemu_clock_get_ns(rtc_clock); + int64_t guest_ns; + time_t guest_s; + + assert(rtc); + + guest_ns = host_ns + rtc->ns_offset; + guest_s = guest_ns / NANOSECONDS_PER_SECOND; + + if (tm) { + gmtime_r(&guest_s, tm); + } + if (ns) { + *ns = guest_ns; + } +} + +int spapr_rtc_import_offset(DeviceState *dev, int64_t legacy_offset) +{ + sPAPRRTCState *rtc; + + if (!dev) { + return -ENODEV; + } + + rtc = SPAPR_RTC(dev); + + rtc->ns_offset = legacy_offset * NANOSECONDS_PER_SECOND; + + return 0; +} + +static void rtas_get_time_of_day(PowerPCCPU *cpu, sPAPRMachineState *spapr, + uint32_t token, uint32_t nargs, + target_ulong args, + uint32_t nret, target_ulong rets) +{ + struct tm tm; + uint32_t ns; + + if ((nargs != 0) || (nret != 8)) { + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + return; + } + + if (!spapr->rtc) { + rtas_st(rets, 0, RTAS_OUT_HW_ERROR); + return; + } + + spapr_rtc_read(spapr->rtc, &tm, &ns); + + rtas_st(rets, 0, RTAS_OUT_SUCCESS); + rtas_st(rets, 1, tm.tm_year + 1900); + rtas_st(rets, 2, tm.tm_mon + 1); + rtas_st(rets, 3, tm.tm_mday); + rtas_st(rets, 4, tm.tm_hour); + rtas_st(rets, 5, tm.tm_min); + rtas_st(rets, 6, tm.tm_sec); + rtas_st(rets, 7, ns); +} + +static void rtas_set_time_of_day(PowerPCCPU *cpu, sPAPRMachineState *spapr, + uint32_t token, uint32_t nargs, + target_ulong args, + uint32_t nret, target_ulong rets) +{ + sPAPRRTCState *rtc; + struct tm tm; + time_t new_s; + int64_t host_ns; + + if ((nargs != 7) || (nret != 1)) { + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + return; + } + + if (!spapr->rtc) { + rtas_st(rets, 0, RTAS_OUT_HW_ERROR); + return; + } + + tm.tm_year = rtas_ld(args, 0) - 1900; + tm.tm_mon = rtas_ld(args, 1) - 1; + tm.tm_mday = rtas_ld(args, 2); + tm.tm_hour = rtas_ld(args, 3); + tm.tm_min = rtas_ld(args, 4); + tm.tm_sec = rtas_ld(args, 5); + + new_s = mktimegm(&tm); + if (new_s == -1) { + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + return; + } + + /* Generate a monitor event for the change */ + qapi_event_send_rtc_change(qemu_timedate_diff(&tm), &error_abort); + + rtc = SPAPR_RTC(spapr->rtc); + + host_ns = qemu_clock_get_ns(rtc_clock); + + rtc->ns_offset = (new_s * NANOSECONDS_PER_SECOND) - host_ns; + + rtas_st(rets, 0, RTAS_OUT_SUCCESS); +} + +static void spapr_rtc_qom_date(Object *obj, struct tm *current_tm, Error **errp) +{ + spapr_rtc_read(DEVICE(obj), current_tm, NULL); +} + +static void spapr_rtc_realize(DeviceState *dev, Error **errp) +{ + sPAPRRTCState *rtc = SPAPR_RTC(dev); + struct tm tm; + time_t host_s; + int64_t rtc_ns; + + /* Initialize the RTAS RTC from host time */ + + qemu_get_timedate(&tm, 0); + host_s = mktimegm(&tm); + rtc_ns = qemu_clock_get_ns(rtc_clock); + rtc->ns_offset = host_s * NANOSECONDS_PER_SECOND - rtc_ns; + + object_property_add_tm(OBJECT(rtc), "date", spapr_rtc_qom_date, NULL); +} + +static const VMStateDescription vmstate_spapr_rtc = { + .name = "spapr/rtc", + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_INT64(ns_offset, sPAPRRTCState), + VMSTATE_END_OF_LIST() + }, +}; + +static void spapr_rtc_class_init(ObjectClass *oc, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(oc); + + dc->realize = spapr_rtc_realize; + dc->vmsd = &vmstate_spapr_rtc; + + spapr_rtas_register(RTAS_GET_TIME_OF_DAY, "get-time-of-day", + rtas_get_time_of_day); + spapr_rtas_register(RTAS_SET_TIME_OF_DAY, "set-time-of-day", + rtas_set_time_of_day); +} + +static const TypeInfo spapr_rtc_info = { + .name = TYPE_SPAPR_RTC, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(sPAPRRTCState), + .class_size = sizeof(XICSStateClass), + .class_init = spapr_rtc_class_init, +}; + +static void spapr_rtc_register_types(void) +{ + type_register_static(&spapr_rtc_info); +} +type_init(spapr_rtc_register_types) |