@@ -70,6 +70,7 @@ typedef struct DSRTCState {
typedef struct DSRTCClass {
I2CSlaveClass parent_obj;
+ bool has_century;
/* actual address space size must be <= NVRAM_SIZE */
unsigned addr_size;
unsigned ctrl_offset;
@@ -91,7 +92,7 @@ static const VMStateDescription vmstate_dsrtc = {
}
};
-static void capture_current_time(DSRTCState *s)
+static void capture_current_time(DSRTCState *s, DSRTCClass *k)
{
/* Capture the current time into the secondary registers
* which will be actually read by the data transfer operation.
@@ -123,25 +124,28 @@ static void capture_current_time(DSRTCState *s)
}
s->nvram[R_DATE] = to_bcd(now.tm_mday);
s->nvram[R_MONTH] = to_bcd(now.tm_mon + 1);
- s->nvram[R_YEAR] = to_bcd(now.tm_year - 100);
+ s->nvram[R_YEAR] = to_bcd(now.tm_year % 100u);
+
+ ARRAY_FIELD_DP32(s->nvram, MONTH, CENTURY,
+ k->has_century && now.tm_year >= 100)
}
-static void inc_regptr(DSRTCState *s)
+static void inc_regptr(DSRTCState *s, DSRTCClass *k)
{
- DSRTCClass *k = DSRTC_GET_CLASS(s);
/* The register pointer wraps around after k->addr_size-1; wraparound
* causes the current time/date to be retransferred into
* the secondary registers.
*/
s->ptr = (s->ptr + 1) % k->addr_size;
if (!s->ptr) {
- capture_current_time(s);
+ capture_current_time(s, k);
}
}
static int dsrtc_event(I2CSlave *i2c, enum i2c_event event)
{
DSRTCState *s = DSRTC(i2c);
+ DSRTCClass *k = DSRTC_GET_CLASS(s);
switch (event) {
case I2C_START_RECV:
@@ -150,7 +154,7 @@ static int dsrtc_event(I2CSlave *i2c, enum i2c_event event)
* START_SEND, because the guest can't get at that data
* without going through a START_RECV which would overwrite it.
*/
- capture_current_time(s);
+ capture_current_time(s, k);
break;
case I2C_START_SEND:
s->addr_byte = true;
@@ -165,10 +169,11 @@ static int dsrtc_event(I2CSlave *i2c, enum i2c_event event)
static int dsrtc_recv(I2CSlave *i2c)
{
DSRTCState *s = DSRTC(i2c);
+ DSRTCClass *k = DSRTC_GET_CLASS(s);
uint8_t res;
res = s->nvram[s->ptr];
- inc_regptr(s);
+ inc_regptr(s, k);
return res;
}
@@ -230,7 +235,7 @@ static int dsrtc_send(I2CSlave *i2c, uint8_t data)
if (s->ptr <= R_YEAR) {
dsrtc_update(s);
}
- inc_regptr(s);
+ inc_regptr(s, k);
return 0;
}
@@ -278,6 +283,7 @@ static void ds1338_class_init(ObjectClass *klass, void *data)
{
DSRTCClass *k = DSRTC_CLASS(klass);
+ k->has_century = false;
k->addr_size = 0x40;
k->ctrl_offset = R_DS1338_CTRL;
k->ctrl_write = ds1338_control_write;
Signed-off-by: Michael Davidsaver <mdavidsaver@gmail.com> --- hw/timer/ds-rtc.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-)