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/* 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);
}
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