FreeBSD Architecture Handbook
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# 8.6 Miscellaneous Topics

## 8.6.1 Interrupt Source and ICU Abstractions

- struct isrc

- pic drivers

## 8.6.2 Other Random Questions/Topics

- Should we pass an interlock into `sema_wait`?

- Should we have non-sleepable sx locks?

- Add some info about proper use of reference counts.

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