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more accurate emulation (do not depend on localtime() or gmtime()

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@872 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-06-03 12:51:19 +00:00
parent ee22c2f7db
commit 43f493afb4
1 changed files with 103 additions and 59 deletions
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162
hw/mc146818rtc.c
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@ -53,9 +53,8 @@
struct RTCState {
uint8_t cmos_data[128];
uint8_t cmos_index;
int current_time; /* in seconds */
struct tm current_tm;
int irq;
uint8_t buf_data[10]; /* buffered data */
/* periodic timer */
QEMUTimer *periodic_timer;
int64_t next_periodic_time;
@ -66,7 +65,6 @@ struct RTCState {
};
static void rtc_set_time(RTCState *s);
static void rtc_set_date_buf(RTCState *s, const struct tm *tm);
static void rtc_copy_date(RTCState *s);
static void rtc_timer_update(RTCState *s, int64_t current_time)
@ -182,27 +180,96 @@ static inline int from_bcd(RTCState *s, int a)
static void rtc_set_time(RTCState *s)
{
struct tm tm1, *tm = &tm1;
struct tm *tm = &s->current_tm;
tm->tm_sec = from_bcd(s, s->cmos_data[RTC_SECONDS]);
tm->tm_min = from_bcd(s, s->cmos_data[RTC_MINUTES]);
tm->tm_hour = from_bcd(s, s->cmos_data[RTC_HOURS]);
tm->tm_hour = from_bcd(s, s->cmos_data[RTC_HOURS] & 0x7f);
if (!(s->cmos_data[RTC_REG_B] & 0x02) &&
(s->cmos_data[RTC_HOURS] & 0x80)) {
tm->tm_hour += 12;
}
tm->tm_wday = from_bcd(s, s->cmos_data[RTC_DAY_OF_WEEK]);
tm->tm_mday = from_bcd(s, s->cmos_data[RTC_DAY_OF_MONTH]);
tm->tm_mon = from_bcd(s, s->cmos_data[RTC_MONTH]) - 1;
tm->tm_year = from_bcd(s, s->cmos_data[RTC_YEAR]) + 100;
/* update internal state */
s->buf_data[RTC_SECONDS] = s->cmos_data[RTC_SECONDS];
s->buf_data[RTC_MINUTES] = s->cmos_data[RTC_MINUTES];
s->buf_data[RTC_HOURS] = s->cmos_data[RTC_HOURS];
s->buf_data[RTC_DAY_OF_WEEK] = s->cmos_data[RTC_DAY_OF_WEEK];
s->buf_data[RTC_DAY_OF_MONTH] = s->cmos_data[RTC_DAY_OF_MONTH];
s->buf_data[RTC_MONTH] = s->cmos_data[RTC_MONTH];
s->buf_data[RTC_YEAR] = s->cmos_data[RTC_YEAR];
s->current_time = mktime(tm);
}
static void rtc_copy_date(RTCState *s)
{
const struct tm *tm = &s->current_tm;
s->cmos_data[RTC_SECONDS] = to_bcd(s, tm->tm_sec);
s->cmos_data[RTC_MINUTES] = to_bcd(s, tm->tm_min);
if (s->cmos_data[RTC_REG_B] & 0x02) {
/* 24 hour format */
s->cmos_data[RTC_HOURS] = to_bcd(s, tm->tm_hour);
} else {
/* 12 hour format */
s->cmos_data[RTC_HOURS] = to_bcd(s, tm->tm_hour % 12);
if (tm->tm_hour >= 12)
s->cmos_data[RTC_HOURS] |= 0x80;
}
s->cmos_data[RTC_DAY_OF_WEEK] = to_bcd(s, tm->tm_wday);
s->cmos_data[RTC_DAY_OF_MONTH] = to_bcd(s, tm->tm_mday);
s->cmos_data[RTC_MONTH] = to_bcd(s, tm->tm_mon + 1);
s->cmos_data[RTC_YEAR] = to_bcd(s, tm->tm_year % 100);
}
/* month is between 0 and 11. */
static int get_days_in_month(int month, int year)
{
static const int days_tab[12] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
int d;
if ((unsigned )month >= 12)
return 31;
d = days_tab[month];
if (month == 1) {
if ((year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0))
d++;
}
return d;
}
/* update 'tm' to the next second */
static void rtc_next_second(struct tm *tm)
{
int days_in_month;
tm->tm_sec++;
if ((unsigned)tm->tm_sec >= 60) {
tm->tm_sec = 0;
tm->tm_min++;
if ((unsigned)tm->tm_min >= 60) {
tm->tm_min = 0;
tm->tm_hour++;
if ((unsigned)tm->tm_hour >= 24) {
tm->tm_hour = 0;
/* next day */
tm->tm_wday++;
if ((unsigned)tm->tm_wday >= 7)
tm->tm_wday = 0;
days_in_month = get_days_in_month(tm->tm_mon,
tm->tm_year + 1900);
tm->tm_mday++;
if (tm->tm_mday < 1) {
tm->tm_mday = 1;
} else if (tm->tm_mday > days_in_month) {
tm->tm_mday = 1;
tm->tm_mon++;
if (tm->tm_mon >= 12) {
tm->tm_mon = 0;
tm->tm_year++;
}
}
}
}
}
}
static void rtc_update_second(void *opaque)
{
RTCState *s = opaque;
@ -213,7 +280,7 @@ static void rtc_update_second(void *opaque)
s->next_second_time += ticks_per_sec;
qemu_mod_timer(s->second_timer, s->next_second_time);
} else {
s->current_time++;
rtc_next_second(&s->current_tm);
if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
/* update in progress bit */
@ -232,10 +299,6 @@ static void rtc_update_second(void *opaque)
static void rtc_update_second2(void *opaque)
{
RTCState *s = opaque;
time_t ti;
ti = s->current_time;
rtc_set_date_buf(s, gmtime(&ti));
if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
rtc_copy_date(s);
@ -244,11 +307,11 @@ static void rtc_update_second2(void *opaque)
/* check alarm */
if (s->cmos_data[RTC_REG_B] & REG_B_AIE) {
if (((s->cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0 ||
s->cmos_data[RTC_SECONDS_ALARM] == s->buf_data[RTC_SECONDS]) &&
s->cmos_data[RTC_SECONDS_ALARM] == s->current_tm.tm_sec) &&
((s->cmos_data[RTC_MINUTES_ALARM] & 0xc0) == 0xc0 ||
s->cmos_data[RTC_MINUTES_ALARM] == s->buf_data[RTC_MINUTES]) &&
s->cmos_data[RTC_MINUTES_ALARM] == s->current_tm.tm_mon) &&
((s->cmos_data[RTC_HOURS_ALARM] & 0xc0) == 0xc0 ||
s->cmos_data[RTC_HOURS_ALARM] == s->buf_data[RTC_HOURS])) {
s->cmos_data[RTC_HOURS_ALARM] == s->current_tm.tm_hour)) {
s->cmos_data[RTC_REG_C] |= 0xa0;
pic_set_irq(s->irq, 1);
@ -305,36 +368,6 @@ static uint32_t cmos_ioport_read(void *opaque, uint32_t addr)
}
}
static void rtc_set_date_buf(RTCState *s, const struct tm *tm)
{
s->buf_data[RTC_SECONDS] = to_bcd(s, tm->tm_sec);
s->buf_data[RTC_MINUTES] = to_bcd(s, tm->tm_min);
if (s->cmos_data[RTC_REG_B] & 0x02) {
/* 24 hour format */
s->buf_data[RTC_HOURS] = to_bcd(s, tm->tm_hour);
} else {
/* 12 hour format */
s->buf_data[RTC_HOURS] = to_bcd(s, tm->tm_hour % 12);
if (tm->tm_hour >= 12)
s->buf_data[RTC_HOURS] |= 0x80;
}
s->buf_data[RTC_DAY_OF_WEEK] = to_bcd(s, tm->tm_wday);
s->buf_data[RTC_DAY_OF_MONTH] = to_bcd(s, tm->tm_mday);
s->buf_data[RTC_MONTH] = to_bcd(s, tm->tm_mon + 1);
s->buf_data[RTC_YEAR] = to_bcd(s, tm->tm_year % 100);
}
static void rtc_copy_date(RTCState *s)
{
s->cmos_data[RTC_SECONDS] = s->buf_data[RTC_SECONDS];
s->cmos_data[RTC_MINUTES] = s->buf_data[RTC_MINUTES];
s->cmos_data[RTC_HOURS] = s->buf_data[RTC_HOURS];
s->cmos_data[RTC_DAY_OF_WEEK] = s->buf_data[RTC_DAY_OF_WEEK];
s->cmos_data[RTC_DAY_OF_MONTH] = s->buf_data[RTC_DAY_OF_MONTH];
s->cmos_data[RTC_MONTH] = s->buf_data[RTC_MONTH];
s->cmos_data[RTC_YEAR] = s->buf_data[RTC_YEAR];
}
void rtc_set_memory(RTCState *s, int addr, int val)
{
if (addr >= 0 && addr <= 127)
@ -343,8 +376,7 @@ void rtc_set_memory(RTCState *s, int addr, int val)
void rtc_set_date(RTCState *s, const struct tm *tm)
{
s->current_time = mktime((struct tm *)tm);
rtc_set_date_buf(s, tm);
s->current_tm = *tm;
rtc_copy_date(s);
}
@ -354,8 +386,14 @@ static void rtc_save(QEMUFile *f, void *opaque)
qemu_put_buffer(f, s->cmos_data, 128);
qemu_put_8s(f, &s->cmos_index);
qemu_put_be32s(f, &s->current_time);
qemu_put_buffer(f, s->buf_data, 10);
qemu_put_be32s(f, &s->current_tm.tm_sec);
qemu_put_be32s(f, &s->current_tm.tm_min);
qemu_put_be32s(f, &s->current_tm.tm_hour);
qemu_put_be32s(f, &s->current_tm.tm_wday);
qemu_put_be32s(f, &s->current_tm.tm_mday);
qemu_put_be32s(f, &s->current_tm.tm_mon);
qemu_put_be32s(f, &s->current_tm.tm_year);
qemu_put_timer(f, s->periodic_timer);
qemu_put_be64s(f, &s->next_periodic_time);
@ -374,8 +412,14 @@ static int rtc_load(QEMUFile *f, void *opaque, int version_id)
qemu_get_buffer(f, s->cmos_data, 128);
qemu_get_8s(f, &s->cmos_index);
qemu_get_be32s(f, &s->current_time);
qemu_get_buffer(f, s->buf_data, 10);
qemu_get_be32s(f, &s->current_tm.tm_sec);
qemu_get_be32s(f, &s->current_tm.tm_min);
qemu_get_be32s(f, &s->current_tm.tm_hour);
qemu_get_be32s(f, &s->current_tm.tm_wday);
qemu_get_be32s(f, &s->current_tm.tm_mday);
qemu_get_be32s(f, &s->current_tm.tm_mon);
qemu_get_be32s(f, &s->current_tm.tm_year);
qemu_get_timer(f, s->periodic_timer);
qemu_get_be64s(f, &s->next_periodic_time);