X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Farch%2Farm.c;fp=src%2Fceph%2Fsrc%2Farch%2Farm.c;h=a8562f59674161bd4a81bce81e997191429bf967;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/arch/arm.c b/src/ceph/src/arch/arm.c
new file mode 100644
index 0000000..a8562f5
--- /dev/null
+++ b/src/ceph/src/arch/arm.c
@@ -0,0 +1,58 @@
+#include "acconfig.h"
+#include "arch/probe.h"
+
+/* flags we export */
+int ceph_arch_neon = 0;
+int ceph_arch_aarch64_crc32 = 0;
+
+#include <stdio.h>
+
+#if __linux__
+
+#include <elf.h>
+#include <link.h> // ElfW macro
+
+#if __arm__ || __aarch64__
+#include <asm/hwcap.h>
+#endif // __arm__
+
+static unsigned long get_auxval(unsigned long type)
+{
+	unsigned long result = 0;
+	FILE *f = fopen("/proc/self/auxv", "r");
+	if (f) {
+		ElfW(auxv_t) entry;
+		while (fread(&entry, sizeof(entry), 1, f) == 1) {
+			if (entry.a_type == type) {
+				result = entry.a_un.a_val;
+				break;
+			}
+		}
+		fclose(f);
+	}
+	return result;
+}
+
+static unsigned long get_hwcap(void)
+{
+	return get_auxval(AT_HWCAP);
+}
+
+#endif // __linux__
+
+int ceph_arch_arm_probe(void)
+{
+#if __arm__ && __linux__
+	ceph_arch_neon = (get_hwcap() & HWCAP_NEON) == HWCAP_NEON;
+#elif __aarch64__ && __linux__
+	ceph_arch_neon = (get_hwcap() & HWCAP_ASIMD) == HWCAP_ASIMD;
+# if defined(HAVE_ARMV8_CRC) && defined(HWCAP_CRC32)
+	ceph_arch_aarch64_crc32 = (get_hwcap() & HWCAP_CRC32) == HWCAP_CRC32;
+# endif
+#else
+	if (0)
+		get_hwcap();  // make compiler shut up
+#endif
+	return 0;
+}
+