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Fix RTC not always updating

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Fixed an issue where RTC was not being updated if only the upper 32 bits (seconds) was read.
Also simplified things by always updating the timestamp instead of only when the seconds changes.
This commit is contained in:
joevt 2022-09-15 20:54:22 -07:00
parent 01d7d6bac3
commit 50dbd5eccd
1 changed files with 10 additions and 6 deletions
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16
cpu/ppc/ppcopcodes.cpp
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@ -855,18 +855,20 @@ void dppc_interpreter::ppc_mtmsr() {
}
}
static inline uint64_t calc_rtcl_value()
static inline void calc_rtcl_value()
{
uint64_t diff = get_virt_time_ns() - rtc_timestamp;
uint64_t new_ts = get_virt_time_ns();
uint64_t diff = new_ts - rtc_timestamp;
uint64_t rtc_inc = diff * tbr_freq_hz / NS_PER_SEC;
uint64_t rtc_l = rtc_lo + (rtc_inc << 7);
if (rtc_l >= ONE_BILLION_NS) { // check RTCL overflow
rtc_hi += rtc_l / ONE_BILLION_NS;
rtc_lo = rtc_l % ONE_BILLION_NS;
rtc_timestamp = get_virt_time_ns();
rtc_l = rtc_lo;
}
return rtc_l & 0x3FFFFF80UL;
else {
rtc_lo = rtc_l;
}
rtc_timestamp = new_ts;
}
void dppc_interpreter::ppc_mfspr() {
@ -880,9 +882,11 @@ void dppc_interpreter::ppc_mfspr() {
switch (ref_spr) {
case SPR::RTCL_U:
ppc_state.spr[SPR::RTCL_U] = calc_rtcl_value();
calc_rtcl_value();
ppc_state.spr[SPR::RTCL_U] = rtc_lo & 0x3FFFFF80UL;
break;
case SPR::RTCU_U:
calc_rtcl_value();
ppc_state.spr[SPR::RTCU_U] = rtc_hi;
break;
}