NAME : HCPEASIT
DSECT : EASIT
FUNCTION : This DSECT maps an e-ASIT, which is CP's external
identification of an address space, and a guest's
identification of a host address space.
LOCATED BY : Any task accepting an e-ASIT from a guest, or
providing one to a guest.
CREATED BY : HCPSITIE when translating an i-ASIT into an e-ASIT.
DELETED BY : Any task which no longer needs the representation.
RELOCATION CONSIDERATIONS : None
NOTES : An e-ASIT is an eight-byte token, doubleword aligned,
and serves as an external representation of an
address space. In external documentation, "ASIT" is
used to designate an e-ASIT. An e-ASIT is given to
guests to represent an address space, and is
guaranteed to be a system-wide unique token, and
unique for the life of the current system IPL. When
referring to the same address space, the same token
is given to different guests. A test for equality
can therefore be used to see if two e-ASITs represent
the same address space. Since an e-ASIT can also be
received from guests, it must also be "verifiable".
That is, CP must be able to reliably decide when a
supposed e-ASIT is a legal token designating an
existing address space.