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RTC: Get and set time without going through s->current_tm 

This patch makes rtc_set_time and rtc_set_cmos work without reading
s->current_tm.  In the case of rtc_set_time I introduce a new
function that retrieves the time and stores into a given struct tm
(not hard-coded to s->current_tm).  In the case of rtc_set_cmos, the
current time is similarly taken from a struct tm rather than
s->current_tm.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2012-08-02 18:04:12 +02:00 committed by Anthony Liguori
parent 00cf57747d
commit e2826cf4a8
1 changed files with 25 additions and 19 deletions
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44
hw/mc146818rtc.c
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@ -86,7 +86,7 @@ typedef struct RTCState {
static void rtc_set_time(RTCState *s);
static void rtc_update_time(RTCState *s);
static void rtc_set_cmos(RTCState *s);
static void rtc_set_cmos(RTCState *s, const struct tm *tm);
static inline int rtc_from_bcd(RTCState *s, int a);
static uint64_t get_next_alarm(RTCState *s);
@ -502,10 +502,8 @@ static inline int rtc_from_bcd(RTCState *s, int a)
}
}
static void rtc_set_time(RTCState *s)
static void rtc_get_time(RTCState *s, struct tm *tm)
{
struct tm *tm = &s->current_tm;
tm->tm_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS]);
tm->tm_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES]);
tm->tm_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS] & 0x7f);
@ -519,16 +517,22 @@ static void rtc_set_time(RTCState *s)
tm->tm_mday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_MONTH]);
tm->tm_mon = rtc_from_bcd(s, s->cmos_data[RTC_MONTH]) - 1;
tm->tm_year = rtc_from_bcd(s, s->cmos_data[RTC_YEAR]) + s->base_year - 1900;
s->base_rtc = mktimegm(tm);
s->last_update = qemu_get_clock_ns(rtc_clock);
rtc_change_mon_event(tm);
}
static void rtc_set_cmos(RTCState *s)
static void rtc_set_time(RTCState *s)
{
struct tm tm;
rtc_get_time(s, &tm);
s->current_tm = tm;
s->base_rtc = mktimegm(&tm);
s->last_update = qemu_get_clock_ns(rtc_clock);
rtc_change_mon_event(&tm);
}
static void rtc_set_cmos(RTCState *s, const struct tm *tm)
{
const struct tm *tm = &s->current_tm;
int year;
s->cmos_data[RTC_SECONDS] = rtc_to_bcd(s, tm->tm_sec);
@ -561,8 +565,8 @@ static void rtc_update_time(RTCState *s)
guest_nsec = get_guest_rtc_ns(s);
guest_sec = guest_nsec / NSEC_PER_SEC;
gmtime_r(&guest_sec, &ret);
rtc_set_cmos(s, &ret);
s->current_tm = ret;
rtc_set_cmos(s);
}
static int update_in_progress(RTCState *s)
@ -677,8 +681,8 @@ static void rtc_set_date_from_host(ISADevice *dev)
s->offset = 0;
/* set the CMOS date */
rtc_set_cmos(s, &tm);
s->current_tm = tm;
rtc_set_cmos(s);
val = rtc_to_bcd(s, (tm.tm_year / 100) + 19);
rtc_set_memory(dev, REG_IBM_CENTURY_BYTE, val);
@ -789,15 +793,17 @@ static void rtc_get_date(Object *obj, Visitor *v, void *opaque,
{
ISADevice *isa = ISA_DEVICE(obj);
RTCState *s = DO_UPCAST(RTCState, dev, isa);
struct tm current_tm;
rtc_update_time(s);
rtc_get_time(s, &current_tm);
visit_start_struct(v, NULL, "struct tm", name, 0, errp);
visit_type_int32(v, &s->current_tm.tm_year, "tm_year", errp);
visit_type_int32(v, &s->current_tm.tm_mon, "tm_mon", errp);
visit_type_int32(v, &s->current_tm.tm_mday, "tm_mday", errp);
visit_type_int32(v, &s->current_tm.tm_hour, "tm_hour", errp);
visit_type_int32(v, &s->current_tm.tm_min, "tm_min", errp);
visit_type_int32(v, &s->current_tm.tm_sec, "tm_sec", errp);
visit_type_int32(v, &current_tm.tm_year, "tm_year", errp);
visit_type_int32(v, &current_tm.tm_mon, "tm_mon", errp);
visit_type_int32(v, &current_tm.tm_mday, "tm_mday", errp);
visit_type_int32(v, &current_tm.tm_hour, "tm_hour", errp);
visit_type_int32(v, &current_tm.tm_min, "tm_min", errp);
visit_type_int32(v, &current_tm.tm_sec, "tm_sec", errp);
visit_end_struct(v, errp);
}