sha512.h

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * SHA-512 accelerated using the sparc64 sha512 opcodes
 4 *
 5 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
 6 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
 7 * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
 8 */
 9
10#include <asm/elf.h>
11#include <asm/opcodes.h>
12#include <asm/pstate.h>
13
14static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_sha512_opcodes);
15
16asmlinkage void sha512_sparc64_transform(struct sha512_block_state *state,
17					 const u8 *data, size_t nblocks);
18
19static void sha512_blocks(struct sha512_block_state *state,
20			  const u8 *data, size_t nblocks)
21{
22	if (static_branch_likely(&have_sha512_opcodes))
23		sha512_sparc64_transform(state, data, nblocks);
24	else
25		sha512_blocks_generic(state, data, nblocks);
26}
27
28#define sha512_mod_init_arch sha512_mod_init_arch
29static void sha512_mod_init_arch(void)
30{
31	unsigned long cfr;
32
33	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
34		return;
35
36	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
37	if (!(cfr & CFR_SHA512))
38		return;
39
40	static_branch_enable(&have_sha512_opcodes);
41	pr_info("Using sparc64 sha512 opcode optimized SHA-512/SHA-384 implementation\n");
42}