eal/arm: check support of armv8.1 atomics

armv8.1 adds support for new atomic instructions.
Linux kernel v4.3 onwards, the presence of atomic instruction
support can detect through HWCAP_ATOMICS

Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Reviewed-by: Jan Viktorin <viktorin@rehivetech.com>

diff --git a/app/test/test_cpuflags.c b/app/test/test_cpuflags.c
index e8d0ce7..d083c86 100644 (file)
--- a/app/test/test_cpuflags.c
+++ b/app/test/test_cpuflags.c
@@ -144,6 +144,9 @@ test_cpuflags(void)
 
        printf("Check for CRC32:\t");
        CHECK_FOR_FLAG(RTE_CPUFLAG_CRC32);
+
+       printf("Check for ATOMICS:\t");
+       CHECK_FOR_FLAG(RTE_CPUFLAG_ATOMICS);
 #endif
 
 #if defined(RTE_ARCH_X86_64) || defined(RTE_ARCH_I686)

diff --git a/lib/librte_eal/common/arch/arm/rte_cpuflags.c b/lib/librte_eal/common/arch/arm/rte_cpuflags.c
index f14c56a..23240ef 100644 (file)
--- a/lib/librte_eal/common/arch/arm/rte_cpuflags.c
+++ b/lib/librte_eal/common/arch/arm/rte_cpuflags.c
@@ -122,6 +122,7 @@ const struct feature_entry rte_cpu_feature_table[] = {
        FEAT_DEF(SHA1,          REG_HWCAP,    5)
        FEAT_DEF(SHA2,          REG_HWCAP,    6)
        FEAT_DEF(CRC32,         REG_HWCAP,    7)
+       FEAT_DEF(ATOMICS,       REG_HWCAP,    8)
        FEAT_DEF(AARCH64,       REG_PLATFORM, 1)
 };
 #endif /* RTE_ARCH */

diff --git a/lib/librte_eal/common/include/arch/arm/rte_cpuflags_64.h b/lib/librte_eal/common/include/arch/arm/rte_cpuflags_64.h
index 810e8a0..49aead9 100644 (file)
--- a/lib/librte_eal/common/include/arch/arm/rte_cpuflags_64.h
+++ b/lib/librte_eal/common/include/arch/arm/rte_cpuflags_64.h
@@ -49,6 +49,7 @@ enum rte_cpu_flag_t {
        RTE_CPUFLAG_SHA1,
        RTE_CPUFLAG_SHA2,
        RTE_CPUFLAG_CRC32,
+       RTE_CPUFLAG_ATOMICS,
        RTE_CPUFLAG_AARCH64,
        /* The last item */
        RTE_CPUFLAG_NUMFLAGS,/**< This should always be the last! */