I'm close to the point of sending messages between APICs, and I was thinking about the semantics of how I actually want to send the message. I need to know the specifics of a few properties of the memory system in order to be sure it will work. First, if I send a bigger message, is it possible it'll be split up before getting to it's destination? Second, if it is split up, is there any guarantee of ordering? Third, is there any easy socket style mechanism to send a bunch of bytes to one location (a bunch of small, sequential writes seems fairly clunky), or would I want to write into a buffer and then somehow signal it was all in there? I've allocated a page of memory space for each APIC so they have a space to send each other messages. I suppose a fourth concern if the buffer approach is used is that multiple APICs could compete to write into the same portion of the APICs page unless it was further divided into regions for each sender.
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