diff options
Diffstat (limited to 'hw/mc146818rtc.c')
| -rw-r--r-- | hw/mc146818rtc.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/hw/mc146818rtc.c b/hw/mc146818rtc.c index cd57bf3760..74d9e1f206 100644 --- a/hw/mc146818rtc.c +++ b/hw/mc146818rtc.c @@ -60,6 +60,7 @@ struct RTCState { uint8_t cmos_data[128]; uint8_t cmos_index; struct tm current_tm; + int base_year; qemu_irq irq; int it_shift; /* periodic timer */ @@ -235,12 +236,13 @@ static void rtc_set_time(RTCState *s) tm->tm_wday = from_bcd(s, s->cmos_data[RTC_DAY_OF_WEEK]) - 1; 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; + tm->tm_year = from_bcd(s, s->cmos_data[RTC_YEAR]) + s->base_year - 1900; } static void rtc_copy_date(RTCState *s) { const struct tm *tm = &s->current_tm; + int year; s->cmos_data[RTC_SECONDS] = to_bcd(s, tm->tm_sec); s->cmos_data[RTC_MINUTES] = to_bcd(s, tm->tm_min); @@ -256,7 +258,10 @@ static void rtc_copy_date(RTCState *s) s->cmos_data[RTC_DAY_OF_WEEK] = to_bcd(s, tm->tm_wday + 1); 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); + year = (tm->tm_year - s->base_year) % 100; + if (year < 0) + year += 100; + s->cmos_data[RTC_YEAR] = to_bcd(s, year); } /* month is between 0 and 11. */ @@ -522,7 +527,7 @@ static int rtc_load_td(QEMUFile *f, void *opaque, int version_id) } #endif -RTCState *rtc_init(int base, qemu_irq irq) +RTCState *rtc_init(int base, qemu_irq irq, int base_year) { RTCState *s; @@ -536,6 +541,7 @@ RTCState *rtc_init(int base, qemu_irq irq) s->cmos_data[RTC_REG_C] = 0x00; s->cmos_data[RTC_REG_D] = 0x80; + s->base_year = base_year; rtc_set_date_from_host(s); s->periodic_timer = qemu_new_timer(vm_clock, @@ -631,7 +637,8 @@ static CPUWriteMemoryFunc *rtc_mm_write[] = { &cmos_mm_writel, }; -RTCState *rtc_mm_init(target_phys_addr_t base, int it_shift, qemu_irq irq) +RTCState *rtc_mm_init(target_phys_addr_t base, int it_shift, qemu_irq irq, + int base_year) { RTCState *s; int io_memory; @@ -646,6 +653,7 @@ RTCState *rtc_mm_init(target_phys_addr_t base, int it_shift, qemu_irq irq) s->cmos_data[RTC_REG_C] = 0x00; s->cmos_data[RTC_REG_D] = 0x80; + s->base_year = base_year; rtc_set_date_from_host(s); s->periodic_timer = qemu_new_timer(vm_clock, |