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

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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>
This commit is contained in:
Anton Blanchard
2013-09-23 12:04:39 +10:00
committed by Benjamin Herrenschmidt
parent 87fec0514f
commit 926f160f46
2 changed files with 20 additions and 4 deletions
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3
arch/powerpc/include/asm/ppc-opcode.h
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@@ -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))))