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4.9.3 Synchronize Instruction
The Synchronize instruction is described in
Section 3.3.3 of Book II, but only at the level required
by an application programmer. This section describes
properties of the instruction that are relevant only to
operating system programmers.
In conjunction with the tlbie and tlbsync instructions,
the sync instruction provides an ordering function for
TLB invalidations and related storage accesses on
other processors as described in the tlbsync instruction
description on page 539.
4.9.4 Lookaside Buffer
Management
All implementations include a TLB as the architected
repository of translation, protection, and attribute information
for storage.
Each implementation that has a TLB or similar lookaside
buffer provides a means by which software can
invalidate the lookaside entry that translates a given
effective address.
Programming Note
The invalidate all entries function is not required
because each TLB entry can be addressed directly
without regard to the contents of the entry.
In addition, implementations provide a means by which
software can do the following.
Read a specified TLB entry
Identify the TLB entry (if any) associated with a
specified effective address
Write a specified TLB entry
Programming Note
Because the presence, absence, and exact
semantics of the TLB Management instructions are
implementation-dependent, it is recommended that
system software “encapsulate” uses of these
instructions into subroutines to minimize the impact
of moving from one implementation to another.
Chapter 4. Storage Control
537