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bio and sensors in OpenBSD

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io(4)<br />

• technically it is a pseudo device that tunnels<br />

ioctls for devices that don't have their own<br />

/dev entry<br />

• drivers have to register with <strong>bio</strong> to be<br />

accessible via <strong>bio</strong><br />

• we def<strong>in</strong>e some ioctls that raid controllers<br />

can implement that is accessable via <strong>bio</strong>

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