192 lines
5.8 KiB
C
192 lines
5.8 KiB
C
/*
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* RTC configuration and clock read
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*
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* Copyright (c) 2003-2020 QEMU contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qemu/cutils.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qerror.h"
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#include "qemu/error-report.h"
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#include "qemu/option.h"
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#include "qemu/timer.h"
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#include "qom/object.h"
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#include "sysemu/replay.h"
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#include "sysemu/sysemu.h"
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static enum {
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RTC_BASE_UTC,
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RTC_BASE_LOCALTIME,
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RTC_BASE_DATETIME,
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} rtc_base_type = RTC_BASE_UTC;
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static time_t rtc_ref_start_datetime;
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static int rtc_realtime_clock_offset; /* used only with QEMU_CLOCK_REALTIME */
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static int rtc_host_datetime_offset = -1; /* valid & used only with
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RTC_BASE_DATETIME */
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QEMUClockType rtc_clock;
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/***********************************************************/
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/* RTC reference time/date access */
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static time_t qemu_ref_timedate(QEMUClockType clock)
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{
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time_t value = qemu_clock_get_ms(clock) / 1000;
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switch (clock) {
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case QEMU_CLOCK_REALTIME:
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value -= rtc_realtime_clock_offset;
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/* fall through */
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case QEMU_CLOCK_VIRTUAL:
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value += rtc_ref_start_datetime;
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break;
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case QEMU_CLOCK_HOST:
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if (rtc_base_type == RTC_BASE_DATETIME) {
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value -= rtc_host_datetime_offset;
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}
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break;
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default:
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assert(0);
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}
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return value;
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}
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void qemu_get_timedate(struct tm *tm, int offset)
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{
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time_t ti = qemu_ref_timedate(rtc_clock);
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ti += offset;
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switch (rtc_base_type) {
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case RTC_BASE_DATETIME:
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case RTC_BASE_UTC:
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gmtime_r(&ti, tm);
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break;
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case RTC_BASE_LOCALTIME:
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localtime_r(&ti, tm);
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break;
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}
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}
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int qemu_timedate_diff(struct tm *tm)
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{
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time_t seconds;
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switch (rtc_base_type) {
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case RTC_BASE_DATETIME:
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case RTC_BASE_UTC:
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seconds = mktimegm(tm);
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break;
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case RTC_BASE_LOCALTIME:
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{
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struct tm tmp = *tm;
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tmp.tm_isdst = -1; /* use timezone to figure it out */
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seconds = mktime(&tmp);
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break;
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}
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default:
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abort();
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}
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return seconds - qemu_ref_timedate(QEMU_CLOCK_HOST);
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}
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static void configure_rtc_base_datetime(const char *startdate)
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{
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time_t rtc_start_datetime;
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struct tm tm;
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if (sscanf(startdate, "%d-%d-%dT%d:%d:%d", &tm.tm_year, &tm.tm_mon,
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&tm.tm_mday, &tm.tm_hour, &tm.tm_min, &tm.tm_sec) == 6) {
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/* OK */
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} else if (sscanf(startdate, "%d-%d-%d",
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&tm.tm_year, &tm.tm_mon, &tm.tm_mday) == 3) {
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tm.tm_hour = 0;
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tm.tm_min = 0;
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tm.tm_sec = 0;
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} else {
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goto date_fail;
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}
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tm.tm_year -= 1900;
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tm.tm_mon--;
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rtc_start_datetime = mktimegm(&tm);
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if (rtc_start_datetime == -1) {
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date_fail:
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error_report("invalid datetime format");
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error_printf("valid formats: "
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"'2006-06-17T16:01:21' or '2006-06-17'\n");
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exit(1);
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}
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rtc_host_datetime_offset = rtc_ref_start_datetime - rtc_start_datetime;
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rtc_ref_start_datetime = rtc_start_datetime;
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}
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void configure_rtc(QemuOpts *opts)
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{
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const char *value;
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/* Set defaults */
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rtc_clock = QEMU_CLOCK_HOST;
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rtc_ref_start_datetime = qemu_clock_get_ms(QEMU_CLOCK_HOST) / 1000;
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rtc_realtime_clock_offset = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) / 1000;
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value = qemu_opt_get(opts, "base");
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if (value) {
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if (!strcmp(value, "utc")) {
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rtc_base_type = RTC_BASE_UTC;
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} else if (!strcmp(value, "localtime")) {
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Error *blocker = NULL;
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rtc_base_type = RTC_BASE_LOCALTIME;
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error_setg(&blocker, QERR_REPLAY_NOT_SUPPORTED,
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"-rtc base=localtime");
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replay_add_blocker(blocker);
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} else {
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rtc_base_type = RTC_BASE_DATETIME;
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configure_rtc_base_datetime(value);
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}
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}
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value = qemu_opt_get(opts, "clock");
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if (value) {
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if (!strcmp(value, "host")) {
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rtc_clock = QEMU_CLOCK_HOST;
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} else if (!strcmp(value, "rt")) {
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rtc_clock = QEMU_CLOCK_REALTIME;
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} else if (!strcmp(value, "vm")) {
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rtc_clock = QEMU_CLOCK_VIRTUAL;
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} else {
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error_report("invalid option value '%s'", value);
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exit(1);
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}
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}
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value = qemu_opt_get(opts, "driftfix");
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if (value) {
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if (!strcmp(value, "slew")) {
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object_register_sugar_prop("mc146818rtc",
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"lost_tick_policy",
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"slew",
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false);
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} else if (!strcmp(value, "none")) {
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/* discard is default */
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} else {
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error_report("invalid option value '%s'", value);
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exit(1);
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}
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}
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}
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