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>

diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index 0fd1928..8752bc8 100644 (file)
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -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 */