powerpc: Little endian builds double word swap VSX state during context save/restore

The elements within VSX loads and stores are big endian ordered
regardless of endianness. Our VSX context save/restore code uses
lxvd2x and stxvd2x which is a 2x doubleword operation. This means
the two doublewords will be swapped and we have to perform another
swap to undo it.

We need to do this on save and restore.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index d7fe9f5b46d4..ad5fcf51b252 100644
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -181,6 +181,7 @@
 #define PPC_INST_TLBIVAX                0x7c000624
 #define PPC_INST_TLBSRX_DOT             0x7c0006a5
 #define PPC_INST_XXLOR                  0xf0000510
+#define PPC_INST_XXSWAPD                0xf0000250
 #define PPC_INST_XVCPSGNDP              0xf0000780
 #define PPC_INST_TRECHKPT               0x7c0007dd
 #define PPC_INST_TRECLAIM               0x7c00075d
@@ -344,6 +345,8 @@
                                                VSX_XX1((s), a, b))
 #define XXLOR(t, a, b)          stringify_in_c(.long PPC_INST_XXLOR | \
                                                VSX_XX3((t), a, b))
+#define XXSWAPD(t, a)           stringify_in_c(.long PPC_INST_XXSWAPD | \
+                                               VSX_XX3((t), a, a))
 #define XVCPSGNDP(t, a, b)      stringify_in_c(.long (PPC_INST_XVCPSGNDP | \
                                                VSX_XX3((t), (a), (b))))