I am currently confused on how Solaris is able to map the swap device to
the swap mount point.

Of course, swap -a lets you specify that the device / slice is for swap.

But in /etc/vfstab:

swap - /tmp tmpfs - yes -


You do not actually say that /tmp will use /dev/dsk/c0t0d0s1.
Where is the mapping of /dev/dsk/c0t0d0s1 <----> /tmp stored ?

.... or is it that you tell it what devices / slices you want to use for
swap, and Solaris will use whatever devices / slices are available for
swap when you use tmpfs ? In this case, where does Solaris store its
list of swap devices / slices ?