1 files changed, 72 insertions, 0 deletions
diff --git a/extra/mariabackup/crc/crc_glue.c b/extra/mariabackup/crc/crc_glue.c
new file mode 100644
index 00000000000..ae3fa91c1b0
--- /dev/null
+++ b/extra/mariabackup/crc/crc_glue.c
@@ -0,0 +1,72 @@
+/******************************************************
+Copyright (c) 2017 Percona LLC and/or its affiliates.
+
+Zlib compatible CRC-32 implementation.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; version 2 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+
+*******************************************************/
+
+#include "crc_glue.h"
+#include "crc-intel-pclmul.h"
+#include <stdint.h>
+#include <string.h>
+#include <zlib.h>
+
+#if __GNUC__ >= 4 && defined(__x86_64__)
+static int pclmul_enabled = 0;
+#endif
+
+#if defined(__GNUC__) && defined(__x86_64__)
+static
+uint32_t
+cpuid(uint32_t*	ecx, uint32_t*	edx)
+{
+	uint32_t level;
+
+	asm("cpuid" : "=a"  (level) : "a" (0) : "ebx", "ecx", "edx");
+
+	if (level < 1) {
+		return level;
+	}
+
+	asm("cpuid" : "=c" (*ecx), "=d" (*edx)
+	    : "a" (1)
+	    : "ebx");
+
+	return level;
+}
+#endif
+
+void crc_init() {
+#if defined(__GNUC__) && defined(__x86_64__)
+	uint32_t ecx, edx;
+
+	if (cpuid(&ecx, &edx) > 0) {
+		pclmul_enabled = ((ecx >> 19) & 1) && ((ecx >> 1) & 1);
+	}
+#endif
+}
+
+unsigned long crc32_iso3309(unsigned long crc, const unsigned char *buf, unsigned int len)
+{
+#if __GNUC__ >= 4 && defined(__x86_64__) && defined(HAVE_CLMUL_INSTRUCTION)
+	if (pclmul_enabled) {
+		uint32_t crc_accum = crc ^ 0xffffffffL;
+		crc32_intel_pclmul(&crc_accum, buf, len);
+		return crc_accum ^ 0xffffffffL;
+	}
+#endif
+	return crc32(crc, buf, len);
+}