sha1.h

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * SHA-1 accelerated using the sparc64 crypto opcodes
 4 *
 5 * Copyright (c) Alan Smithee.
 6 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
 7 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
 8 * Copyright (c) Mathias Krause <minipli@googlemail.com>
 9 */
10
11#include <asm/elf.h>
12#include <asm/opcodes.h>
13#include <asm/pstate.h>
14
15static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_sha1_opcodes);
16
17asmlinkage void sha1_sparc64_transform(struct sha1_block_state *state,
18				       const u8 *data, size_t nblocks);
19
20static void sha1_blocks(struct sha1_block_state *state,
21			const u8 *data, size_t nblocks)
22{
23	if (static_branch_likely(&have_sha1_opcodes))
24		sha1_sparc64_transform(state, data, nblocks);
25	else
26		sha1_blocks_generic(state, data, nblocks);
27}
28
29#define sha1_mod_init_arch sha1_mod_init_arch
30static void sha1_mod_init_arch(void)
31{
32	unsigned long cfr;
33
34	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
35		return;
36
37	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
38	if (!(cfr & CFR_SHA1))
39		return;
40
41	static_branch_enable(&have_sha1_opcodes);
42	pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n");
43}