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-rw-r--r--lib/crypto/s390/sha512.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/crypto/s390/sha512.h b/lib/crypto/s390/sha512.h
new file mode 100644
index 000000000000..24744651550c
--- /dev/null
+++ b/lib/crypto/s390/sha512.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * SHA-512 optimized using the CP Assist for Cryptographic Functions (CPACF)
+ *
+ * Copyright 2025 Google LLC
+ */
+#include <asm/cpacf.h>
+#include <linux/cpufeature.h>
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_cpacf_sha512);
+
+static void sha512_blocks(struct sha512_block_state *state,
+ const u8 *data, size_t nblocks)
+{
+ if (static_branch_likely(&have_cpacf_sha512))
+ cpacf_kimd(CPACF_KIMD_SHA_512, state, data,
+ nblocks * SHA512_BLOCK_SIZE);
+ else
+ sha512_blocks_generic(state, data, nblocks);
+}
+
+#define sha512_mod_init_arch sha512_mod_init_arch
+static inline void sha512_mod_init_arch(void)
+{
+ if (cpu_have_feature(S390_CPU_FEATURE_MSA) &&
+ cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_512))
+ static_branch_enable(&have_cpacf_sha512);
+}