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>

2 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index 4c25319f2fb..5f73ce63fca 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)
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 121a90bbf77..a1096fb6281 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -524,6 +524,7 @@
 
 #define SPRN_HSRR0      0x13A   /* Save/Restore Register 0 */
 #define SPRN_HSRR1      0x13B   /* Save/Restore Register 1 */
+#define   HSRR1_DENORM          0x00100000 /* Denorm exception */
 
 #define SPRN_TBCTL      0x35f   /* PA6T Timebase control register */
 #define   TBCTL_FREEZE          0x0000000000000000ull /* Freeze all tbs */