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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>
This commit is contained in:
Michael Neuling 2013-02-13 16:21:30 +00:00 committed by Benjamin Herrenschmidt
parent 6a6d541f33
commit 14c39a4cf6
1 changed files with 10 additions and 0 deletions
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10
arch/powerpc/include/asm/ppc-opcode.h
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@ -129,6 +129,9 @@
#define PPC_INST_TLBSRX_DOT 0x7c0006a5
#define PPC_INST_XXLOR 0xf0000510
#define PPC_INST_XVCPSGNDP 0xf0000780
#define PPC_INST_TRECHKPT 0x7c0007dd
#define PPC_INST_TRECLAIM 0x7c00075d
#define PPC_INST_TABORT 0x7c00071d
#define PPC_INST_NAP 0x4c000364
#define PPC_INST_SLEEP 0x4c0003a4
@ -294,4 +297,11 @@
#define PPC_NAP stringify_in_c(.long PPC_INST_NAP)
#define PPC_SLEEP stringify_in_c(.long PPC_INST_SLEEP)
/* Transactional memory instructions */
#define TRECHKPT stringify_in_c(.long PPC_INST_TRECHKPT)
#define TRECLAIM(r) stringify_in_c(.long PPC_INST_TRECLAIM \
| __PPC_RA(r))
#define TABORT(r) stringify_in_c(.long PPC_INST_TABORT \
| __PPC_RA(r))
#endif /* _ASM_POWERPC_PPC_OPCODE_H */