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authorMichael Neuling <mikey@neuling.org>2012-09-10 00:35:26 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-09-17 16:31:47 +1000
commitb92a66a65cb4480774066d9a3080c77eb34b7232 (patch)
treeba40ef5be8bdb9b76e36ec1da29db90189d2a821 /arch/powerpc/include/asm/ppc-opcode.h
parenteda485f06d17f98bd58559fb5dd331951ffd1608 (diff)
powerpc: Add denormalisation exception handling for POWER6/7
On POWER6 and POWER7 if the input operand to an instruction is a denormalised single precision binary floating point value we can take a denormalisation exception where it's expected that the hypervisor (HV=1) will fix up the inputs before the instruction is run. This adds code to handle this denormalisation exception for POWER6 and POWER7. It also add a CONFIG_PPC_DENORMALISATION option and sets it in pseries/ppc64_defconfig. This is useful on bare metal systems only. Based on patch from Milton Miller. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/ppc-opcode.h')
-rw-r--r--arch/powerpc/include/asm/ppc-opcode.h3
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 4c25319f2fbc..5f73ce63fcae 100644
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -126,6 +126,7 @@
#define PPC_INST_TLBIVAX 0x7c000624
#define PPC_INST_TLBSRX_DOT 0x7c0006a5
#define PPC_INST_XXLOR 0xf0000510
+#define PPC_INST_XVCPSGNDP 0xf0000780
#define PPC_INST_NAP 0x4c000364
#define PPC_INST_SLEEP 0x4c0003a4
@@ -277,6 +278,8 @@
VSX_XX1((s), a, b))
#define XXLOR(t, a, b) stringify_in_c(.long PPC_INST_XXLOR | \
VSX_XX3((t), a, b))
+#define XVCPSGNDP(t, a, b) stringify_in_c(.long (PPC_INST_XVCPSGNDP | \
+ VSX_XX3((t), (a), (b))))
#define PPC_NAP stringify_in_c(.long PPC_INST_NAP)
#define PPC_SLEEP stringify_in_c(.long PPC_INST_SLEEP)