added a timerhalt() function #176
Open
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
The virt QEMU board integrates a "test finisher" device. Writing FINISHER_PASS(=0x5555) to its address which is VIRT_TEST(=0x100000), will halt virt machine. Since this should be done in machine mode, a new flag is set by timerhalt() in supervisor mode. Later timervec() will check this flag, which is at the end of timer scratch area. If the halt flag is not zero, it will branch to halt. It can be used to halt when kernel panics in printf.c It can be triggered in user mode by killing init process, using the following command at shell: kill 1
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
The virt QEMU board integrates a "test finisher" device. Writing FINISHER_PASS(=0x5555) to its address which is VIRT_TEST(=0x100000), will halt virt machine.
Since this should be done in machine mode, a new flag is set by timerhalt() in supervisor mode. Later timervec() will check this flag, which is at the end of timer scratch area. If the halt flag is not zero, it will branch to halt.
It can be used to halt when kernel panics in printf.c
It can be triggered in user mode by killing init process, using the following command at shell:
kill 1
Related to issue #60