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/*
* 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 "qemu/osdep.h"
#include "qemu-common.h"
#include "cpu.h"
#include "qemu/timer.h"
#include "sysemu/sysemu.h"
#include "hw/ppc/spapr.h"
#include "migration/vmstate.h"
#include "qapi/error.h"
#include "qapi/qapi-events-misc-target.h"
#include "qemu/cutils.h"
#include "qemu/module.h"
void spapr_rtc_read(SpaprRtcState *rtc, struct tm *tm, uint32_t *ns)
{
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(SpaprRtcState *rtc, int64_t legacy_offset)
{
if (!rtc) {
return -ENODEV;
}
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;
}
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 = &spapr->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;
}
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));
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(SPAPR_RTC(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;
/* Reason: This is an internal device only for handling the hypercalls */
dc->user_creatable = false;
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_DEVICE,
.instance_size = sizeof(SpaprRtcState),
.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)
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