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
15 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_sha1_opcodes);
16
17 asmlinkage void sha1_sparc64_transform(struct sha1_block_state *state,
18 const u8 *data, size_t nblocks);
19
sha1_blocks(struct sha1_block_state * state,const u8 * data,size_t nblocks)20 static 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
sha1_mod_init_arch(void)30 static inline 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 }
44