diff options
Diffstat (limited to 'lib/crypto/x86/sha1.h')
| -rw-r--r-- | lib/crypto/x86/sha1.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/lib/crypto/x86/sha1.h b/lib/crypto/x86/sha1.h new file mode 100644 index 000000000000..e308379d89bc --- /dev/null +++ b/lib/crypto/x86/sha1.h @@ -0,0 +1,74 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * SHA-1 optimized for x86_64 + * + * Copyright 2025 Google LLC + */ +#include <asm/fpu/api.h> +#include <linux/static_call.h> + +DEFINE_STATIC_CALL(sha1_blocks_x86, sha1_blocks_generic); + +#define DEFINE_X86_SHA1_FN(c_fn, asm_fn) \ + asmlinkage void asm_fn(struct sha1_block_state *state, \ + const u8 *data, size_t nblocks); \ + static void c_fn(struct sha1_block_state *state, \ + const u8 *data, size_t nblocks) \ + { \ + if (likely(irq_fpu_usable())) { \ + kernel_fpu_begin(); \ + asm_fn(state, data, nblocks); \ + kernel_fpu_end(); \ + } else { \ + sha1_blocks_generic(state, data, nblocks); \ + } \ + } + +DEFINE_X86_SHA1_FN(sha1_blocks_ssse3, sha1_transform_ssse3); +DEFINE_X86_SHA1_FN(sha1_blocks_avx, sha1_transform_avx); +DEFINE_X86_SHA1_FN(sha1_blocks_ni, sha1_ni_transform); + +#define SHA1_AVX2_BLOCK_OPTSIZE 4 /* optimal 4*64 bytes of SHA1 blocks */ + +asmlinkage void sha1_transform_avx2(struct sha1_block_state *state, + const u8 *data, size_t nblocks); +static void sha1_blocks_avx2(struct sha1_block_state *state, + const u8 *data, size_t nblocks) +{ + if (likely(irq_fpu_usable())) { + kernel_fpu_begin(); + /* Select the optimal transform based on the number of blocks */ + if (nblocks >= SHA1_AVX2_BLOCK_OPTSIZE) + sha1_transform_avx2(state, data, nblocks); + else + sha1_transform_avx(state, data, nblocks); + kernel_fpu_end(); + } else { + sha1_blocks_generic(state, data, nblocks); + } +} + +static void sha1_blocks(struct sha1_block_state *state, + const u8 *data, size_t nblocks) +{ + static_call(sha1_blocks_x86)(state, data, nblocks); +} + +#define sha1_mod_init_arch sha1_mod_init_arch +static inline void sha1_mod_init_arch(void) +{ + if (boot_cpu_has(X86_FEATURE_SHA_NI)) { + static_call_update(sha1_blocks_x86, sha1_blocks_ni); + } else if (cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, + NULL) && + boot_cpu_has(X86_FEATURE_AVX)) { + if (boot_cpu_has(X86_FEATURE_AVX2) && + boot_cpu_has(X86_FEATURE_BMI1) && + boot_cpu_has(X86_FEATURE_BMI2)) + static_call_update(sha1_blocks_x86, sha1_blocks_avx2); + else + static_call_update(sha1_blocks_x86, sha1_blocks_avx); + } else if (boot_cpu_has(X86_FEATURE_SSSE3)) { + static_call_update(sha1_blocks_x86, sha1_blocks_ssse3); + } +} |