1 files changed, 34 insertions, 0 deletions
diff --git a/arch/riscv/lib/crc64.c b/arch/riscv/lib/crc64.c
new file mode 100644
index 000000000000..f0015a27836a
--- /dev/null
+++ b/arch/riscv/lib/crc64.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * RISC-V optimized CRC64 functions
+ *
+ * Copyright 2025 Google LLC
+ */
+
+#include <asm/hwcap.h>
+#include <asm/alternative-macros.h>
+#include <linux/crc64.h>
+#include <linux/module.h>
+
+#include "crc-clmul.h"
+
+u64 crc64_be_arch(u64 crc, const u8 *p, size_t len)
+{
+	if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
+		return crc64_msb_clmul(crc, p, len,
+				       &crc64_msb_0x42f0e1eba9ea3693_consts);
+	return crc64_be_generic(crc, p, len);
+}
+EXPORT_SYMBOL(crc64_be_arch);
+
+u64 crc64_nvme_arch(u64 crc, const u8 *p, size_t len)
+{
+	if (riscv_has_extension_likely(RISCV_ISA_EXT_ZBC))
+		return crc64_lsb_clmul(crc, p, len,
+				       &crc64_lsb_0x9a6c9329ac4bc9b5_consts);
+	return crc64_nvme_generic(crc, p, len);
+}
+EXPORT_SYMBOL(crc64_nvme_arch);
+
+MODULE_DESCRIPTION("RISC-V optimized CRC64 functions");
+MODULE_LICENSE("GPL");