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Fix RTC units

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Fixed an issue where get-msecs-601 and get-msecs-60x were not returning the same value. RTC was being calculated using timebase frequency instead of nanosecond frequency. 601 uses RTC. 60x uses TBR. On a real Mac, a G3 CPU won't have a RTC and accessing RTC would cause an exception. This is not the case for dingusppc but I don't think that's a problem.
This commit is contained in:
joevt 2022-09-15 21:05:08 -07:00
parent ed424ad544
commit b665f2cb4e
1 changed files with 1 additions and 3 deletions
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4
cpu/ppc/ppcopcodes.cpp
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@ -858,9 +858,7 @@ void dppc_interpreter::ppc_mtmsr() {
static inline void calc_rtcl_value()
{
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);
uint64_t rtc_l = new_ts - rtc_timestamp + rtc_lo;
if (rtc_l >= ONE_BILLION_NS) { // check RTCL overflow
rtc_hi += rtc_l / ONE_BILLION_NS;
rtc_lo = rtc_l % ONE_BILLION_NS;