tree ed0b8af7c9a15f78ef1146f8eb9c0dacbce5096d
parent 6a6d541f33111385ec2746caa39377ffcd30f095
author Michael Neuling <mikey@neuling.org> 1360772490 +0000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1360907929 +1100

powerpc: Add new instructions for transactional memory

Here we define the new instructions we need for transactional memory in the
kernel.  This is so we can support compiling with binutils that don't support
the new transactional memory instructions.

Transactional memory results in two sets of architected state (GPRs/VSRs
etc).

treclaim allows us to read the checkpointed state (from the tbegin) so that we
can store it away on a context switch.  It does this by overwriting the exiting
architected state, so you have to save that away before you treclaim.  treclaim
will also abort a transaction, so you can give a register value which contains
an abort reason.

trecheckpoint allows us to inject into the checkpointed state as if it were at
the tbegin.  It does this by copying the current architected state into the
checkpointed state.

Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>