1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * SHA-256 accelerated using the sparc64 sha256 opcodes
4 *
5 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
6 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
7 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
8 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.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_sha256_opcodes);
16
17 asmlinkage void sha256_sparc64_transform(struct sha256_block_state *state,
18 const u8 *data, size_t nblocks);
19
sha256_blocks(struct sha256_block_state * state,const u8 * data,size_t nblocks)20 static void sha256_blocks(struct sha256_block_state *state,
21 const u8 *data, size_t nblocks)
22 {
23 if (static_branch_likely(&have_sha256_opcodes))
24 sha256_sparc64_transform(state, data, nblocks);
25 else
26 sha256_blocks_generic(state, data, nblocks);
27 }
28
29 #define sha256_mod_init_arch sha256_mod_init_arch
sha256_mod_init_arch(void)30 static inline void sha256_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_SHA256))
39 return;
40
41 static_branch_enable(&have_sha256_opcodes);
42 pr_info("Using sparc64 sha256 opcode optimized SHA-256/SHA-224 implementation\n");
43 }
44