initial code repo

[stor4nfv.git] / src / ceph / src / arch / arm.c

diff --git a/src/ceph/src/arch/arm.c b/src/ceph/src/arch/arm.c
new file mode 100644 (file)
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;
+}
+