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Re: Part III: Hardware & Software Sharing Responsibilities
GStringham   5/23/2012 3:13:56 PM
@luiscost - The fundamental communication between hw and sw is simply sw writes to a hw register when it needs to tell hw something, and hw generates an interrupt when it needs to tell sw something. In most cases, a sw driver totally owns its respective hw registers. No coordination needed. The only complication is that when hw generates an interrupt, it takes some decoding to determine which driver the interrupt is for. Then that driver services it as necessary. IPC is necessary because both processes can't be running at the same time. So IPC is needed to hold messages (and data) until the other process is allowed to run. That's not an issue between hw and sw.

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