diff options
Diffstat (limited to 'lib/crypto/arm/sha256.h')
| -rw-r--r-- | lib/crypto/arm/sha256.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/lib/crypto/arm/sha256.h b/lib/crypto/arm/sha256.h new file mode 100644 index 000000000000..da75cbdc51d4 --- /dev/null +++ b/lib/crypto/arm/sha256.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * SHA-256 optimized for ARM + * + * Copyright 2025 Google LLC + */ +#include <asm/neon.h> +#include <crypto/internal/simd.h> + +asmlinkage void sha256_block_data_order(struct sha256_block_state *state, + const u8 *data, size_t nblocks); +asmlinkage void sha256_block_data_order_neon(struct sha256_block_state *state, + const u8 *data, size_t nblocks); +asmlinkage void sha256_ce_transform(struct sha256_block_state *state, + const u8 *data, size_t nblocks); + +static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon); +static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce); + +static void sha256_blocks(struct sha256_block_state *state, + const u8 *data, size_t nblocks) +{ + if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && + static_branch_likely(&have_neon) && crypto_simd_usable()) { + kernel_neon_begin(); + if (static_branch_likely(&have_ce)) + sha256_ce_transform(state, data, nblocks); + else + sha256_block_data_order_neon(state, data, nblocks); + kernel_neon_end(); + } else { + sha256_block_data_order(state, data, nblocks); + } +} + +#ifdef CONFIG_KERNEL_MODE_NEON +#define sha256_mod_init_arch sha256_mod_init_arch +static inline void sha256_mod_init_arch(void) +{ + if (elf_hwcap & HWCAP_NEON) { + static_branch_enable(&have_neon); + if (elf_hwcap2 & HWCAP2_SHA2) + static_branch_enable(&have_ce); + } +} +#endif /* CONFIG_KERNEL_MODE_NEON */ |