[Qemu-devel] [PATCH 1/3] Add rtc reset function.

[Gleb Natapov]

On reset:
Periodic Interrupt Enable (PIE) bit is cleared to zero
Alarm Interrupt Enable (AIE) bit is cleared to zero
Update ended Interrupt Flag (UF) bit is cleared to zero
Interrupt Request status Flag (IRQF) bit is cleared to zero
Periodic Interrupt Flag (PF) bit is cleared to zero
Alarm Interrupt Flag (AF) bit is cleared to zero
Square Wave output Enable (SQWE) zero

Signed-off-by: Gleb Natapov <address@hidden>
---
 hw/mc146818rtc.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/hw/mc146818rtc.c b/hw/mc146818rtc.c
index 888b85a..98a2273 100644
--- a/hw/mc146818rtc.c
+++ b/hw/mc146818rtc.c
@@ -568,6 +568,22 @@ static int rtc_load_td(QEMUFile *f, void *opaque, int 
version_id)
 }
 #endif
 
+static void rtc_reset(void *opaque)
+{
+    RTCState *s = opaque;
+
+    /* clear PIE,AIE,SQWE on reset */
+    s->cmos_data[RTC_REG_B] &= ~((1<<6) | (1<<5) | (1<<3));
+
+    /* clear UF,IRQF,PF,AF on reset */
+    s->cmos_data[RTC_REG_C] &= ~((1<<4) | (1<<7) | (1<<6) | (1<<5));
+
+#ifdef TARGET_I386
+    if (rtc_td_hack)
+           s->irq_coalesced = 0;
+#endif
+}
+
 RTCState *rtc_init_sqw(int base, qemu_irq irq, qemu_irq sqw_irq, int base_year)
 {
     RTCState *s;
@@ -606,6 +622,8 @@ RTCState *rtc_init_sqw(int base, qemu_irq irq, qemu_irq 
sqw_irq, int base_year)
     if (rtc_td_hack)
         register_savevm("mc146818rtc-td", base, 1, rtc_save_td, rtc_load_td, 
s);
 #endif
+    qemu_register_reset(rtc_reset, 0, s);
+
     return s;
 }
 
@@ -721,5 +739,6 @@ RTCState *rtc_mm_init(target_phys_addr_t base, int 
it_shift, qemu_irq irq,
     if (rtc_td_hack)
         register_savevm("mc146818rtc-td", base, 1, rtc_save_td, rtc_load_td, 
s);
 #endif
+    qemu_register_reset(rtc_reset, 0, s);
     return s;
 }
-- 
1.6.2.1