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Bug #13301

bhyve PIT not periodic for square wave mode

Added by Patrick Mooney 20 days ago. Updated 18 days ago.

Status:
In Progress
Priority:
Normal
Category:
bhyve
Start date:
Due date:
% Done:

0%

Estimated time:
Difficulty:
Medium
Tags:
bhyve
Gerrit CR:

Description

While testing an experimental bootrom under bhyve, I found unexpected behavior in the PIT emulation: The square wave mode, which should be periodic, like the rate generation mode, was behaving as a one-shot timer.

It needs to be updated to both run in the expected periodic fashion and have the count-down semantics described by the specification. (The square-wave counter proceeds at a doubled tick rate, keeping the value even.)

#1

Updated by Electric Monk 18 days ago

  • Gerrit CR set to 1056

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