Not knowing anything about Solaris, I can't easily answer that.
But I can tell you that (under Linux) files and directories /proc/ are handled by individual kernel modules, so it's possible for a device driver to add entries to the /proc/ filesystem (usually for information and control for one or more devices).
So what you get under /proc/ in Linux depends on which kernel modules you have installed and loaded.
Hope that's of some help,
— Robert J. Lee
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