md5.h

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * MD5 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 * Copyright (c) Cryptoapi developers.
10 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
11 */
12
13#include <asm/elf.h>
14#include <asm/opcodes.h>
15#include <asm/pstate.h>
16
17static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_md5_opcodes);
18
19asmlinkage void md5_sparc64_transform(struct md5_block_state *state,
20				      const u8 *data, size_t nblocks);
21
22static void md5_blocks(struct md5_block_state *state,
23		       const u8 *data, size_t nblocks)
24{
25	if (static_branch_likely(&have_md5_opcodes)) {
26		cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
27		md5_sparc64_transform(state, data, nblocks);
28		le32_to_cpu_array(state->h, ARRAY_SIZE(state->h));
29	} else {
30		md5_blocks_generic(state, data, nblocks);
31	}
32}
33
34#define md5_mod_init_arch md5_mod_init_arch
35static void md5_mod_init_arch(void)
36{
37	unsigned long cfr;
38
39	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
40		return;
41
42	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
43	if (!(cfr & CFR_MD5))
44		return;
45
46	static_branch_enable(&have_md5_opcodes);
47	pr_info("Using sparc64 md5 opcode optimized MD5 implementation\n");
48}