[Qemu-devel] [Bug 1090558] [NEW] hw/mc146818: error reading RTC_HOURS_ALARM

[Antoine Mathys]

Public bug reported:

get_next_alarm() doesn't read the RTC_HOURS_ALARM field correctly.

- Bit 7 must be masked before conversion from BCD.
- Care must be taken to check the don't care condition before masking.
- The PM bit must be read from RTC_HOURS_ALARM, not from RTC_HOURS (as is done 
in convert_hour()).

Seen in commit e376a788ae130454ad5e797f60cb70d0308babb6.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1090558

Title:
  hw/mc146818: error reading RTC_HOURS_ALARM

Status in QEMU:
  New

Bug description:
  get_next_alarm() doesn't read the RTC_HOURS_ALARM field correctly.

  - Bit 7 must be masked before conversion from BCD.
  - Care must be taken to check the don't care condition before masking.
  - The PM bit must be read from RTC_HOURS_ALARM, not from RTC_HOURS (as is 
done in convert_hour()).

  Seen in commit e376a788ae130454ad5e797f60cb70d0308babb6.

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