feat(hw_crc): add support for HW computed CRC
Added support for HW computed CRC using Arm ACLE intrinsics.
These are built-in intrinsics available for ARMv8.1-A, and
onwards.
These intrinsics are enabled via '-march=armv8-a+crc' compile
switch for ARMv8-A (supports CRC instructions optionally).
HW CRC support is enabled unconditionally in BL2 for all Arm
platforms.
HW CRC calculation is verified offline to ensure a similar
result as its respective ZLib utility function.
HW CRC calculation support will be used in the upcoming
firmware update patches.
Change-Id: Ia2ae801f62d2003e89a9c3e6d77469b5312614b3
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/include/common/hw_crc32.h b/include/common/hw_crc32.h
new file mode 100644
index 0000000..0d14d57
--- /dev/null
+++ b/include/common/hw_crc32.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef HW_CRC32_H
+#define HW_CRC32_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+/* compute CRC using Arm intrinsic function */
+uint32_t hw_crc32(uint32_t crc, const unsigned char *buf, size_t size);
+
+#endif /* HW_CRC32_H */
diff --git a/include/lib/libc/arm_acle.h b/include/lib/libc/arm_acle.h
index 953933f..eb08552 100644
--- a/include/lib/libc/arm_acle.h
+++ b/include/lib/libc/arm_acle.h
@@ -14,8 +14,10 @@
#define ARM_ACLE_H
#if !defined(__aarch64__) || defined(__clang__)
+# define __crc32b __builtin_arm_crc32b
# define __crc32w __builtin_arm_crc32w
#else
+# define __crc32b __builtin_aarch64_crc32b
# define __crc32w __builtin_aarch64_crc32w
#endif