tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * SHA-1 optimized using the CP Assist for Cryptographic Functions (CPACF)
4 *
5 * Copyright 2025 Google LLC
6 */
7#include <asm/cpacf.h>
8#include <linux/cpufeature.h>
9
10static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_cpacf_sha1);
11
12static void sha1_blocks(struct sha1_block_state *state,
13 const u8 *data, size_t nblocks)
14{
15 if (static_branch_likely(&have_cpacf_sha1))
16 cpacf_kimd(CPACF_KIMD_SHA_1, state, data,
17 nblocks * SHA1_BLOCK_SIZE);
18 else
19 sha1_blocks_generic(state, data, nblocks);
20}
21
22#define sha1_mod_init_arch sha1_mod_init_arch
23static void sha1_mod_init_arch(void)
24{
25 if (cpu_have_feature(S390_CPU_FEATURE_MSA) &&
26 cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_1))
27 static_branch_enable(&have_cpacf_sha1);
28}