The precedent we have used is that features that refer to ISA Categories
include _HAS_ following the PPC_FEATURE[2]. So GLIBC specifies in hwcap.h:
/* Feature definitions in AT_HWCAP2. */
#define PPC_FEATURE2_ARCH_2_07 0x80000000 /* ISA 2.07 */
#define PPC_FEATURE2_HAS_HTM 0x40000000 /* Hardware Transactional
Memory */
#define PPC_FEATURE2_HAS_DSCR 0x20000000 /* Data Stream Control
Register */
#define PPC_FEATURE2_HAS_EBB 0x10000000 /* Event Base Branching */
#define PPC_FEATURE2_HAS_ISEL 0x08000000 /* Integer Select */
#define PPC_FEATURE2_HAS_TAR 0x04000000 /* Target Address Register */
This was carried from the original AT_HWCAP defines.
$ grep _HAS_ ./sysdeps/powerpc/bits/hwcap.h
#define PPC_FEATURE_HAS_ALTIVEC 0x10000000 /* SIMD/Vector Unit. */
#define PPC_FEATURE_HAS_FPU 0x08000000 /* Floating Point Unit. */
#define PPC_FEATURE_HAS_MMU 0x04000000 /* Memory Management Unit. */
#define PPC_FEATURE_HAS_4xxMAC 0x02000000 /* 4xx Multiply
Accumulator. */
#define PPC_FEATURE_HAS_SPE 0x00800000 /* Signal Processing ext. */
#define PPC_FEATURE_HAS_EFP_SINGLE 0x00400000 /* SPE Float. */
#define PPC_FEATURE_HAS_EFP_DOUBLE 0x00200000 /* SPE Double. */
#define PPC_FEATURE_HAS_DFP 0x00000400 /* Decimal FP Unit */
#define PPC_FEATURE_HAS_VSX 0x00000080 /* P7 Vector Extension. */
So could we agree on PPC_FEATURE2_HAS_VEC_CRYPTO or the shorter
PPC_FEATURE2_HAS_VCRYPTO?
Steven J. Munroe
Linux on Power Toolchain Architect
IBM Corporation, Linux Technology Center
From: Benjamin Herrenschmidt <b...@kernel.crashing.org>
To: linuxppc-...@ozlabs.org
Cc: Steve Munroe/Rochester/IBM@IBMUS, Hanns-Joachim Uhl
<hannsj_...@de.ibm.com>, Diane Brent/Poughkeepsie/IBM@IBMUS,
Jeffrey Scheel/Rochester/IBM@IBMUS, Adhemerval Zanella
<azane...@linux.vnet.ibm.com>
Date: 06/10/2014 12:05 AM
Subject: [PATCH] powerpc: Add AT_HWCAP2 to indicate V.CRYPTO category
support
The Vector Crypto category instructions are supported by current POWER8
chips, advertise them to userspace using a specific bit to properly
differentiate with chips of the same architecture level that might not
have them.
Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
CC: <sta...@vger.kernel.org> [v3.10+]
--
diff --git a/arch/powerpc/include/uapi/asm/cputable.h
b/arch/powerpc/include/uapi/asm/cputable.h
index 5b76579..de2c0e4 100644
--- a/arch/powerpc/include/uapi/asm/cputable.h
+++ b/arch/powerpc/include/uapi/asm/cputable.h
@@ -41,5 +41,6 @@
#define PPC_FEATURE2_EBB 0x10000000
#define PPC_FEATURE2_ISEL 0x08000000
#define PPC_FEATURE2_TAR 0x04000000
+#define PPC_FEATURE2_VEC_CRYPTO 0x02000000
#endif /* _UAPI__ASM_POWERPC_CPUTABLE_H */
diff --git a/arch/powerpc/kernel/cputable.c
b/arch/powerpc/kernel/cputable.c
index c1faade..11da04a 100644
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -109,7 +109,8 @@ extern void __restore_cpu_e6500(void);
PPC_FEATURE_PSERIES_PERFMON_COMPAT)
#define COMMON_USER2_POWER8 (PPC_FEATURE2_ARCH_2_07 | \
PPC_FEATURE2_HTM_COMP |
PPC_FEATURE2_DSCR | \
-
PPC_FEATURE2_ISEL |
PPC_FEATURE2_TAR)
+
PPC_FEATURE2_ISEL |
PPC_FEATURE2_TAR | \
+
PPC_FEATURE2_VEC_CRYPTO)
#define COMMON_USER_PA6T (COMMON_USER_PPC64 | PPC_FEATURE_PA6T
|\
PPC_FEATURE_TRUE_LE | \
PPC_FEATURE_HAS_ALTIVEC_COMP)
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