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/* SPDX-License-Identifier: GPL-2.0 OR MIT */
/*
* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include <asm/hwcap.h>
#include <asm/neon.h>
#if defined(CONFIG_ARM)
#include <asm/system_info.h>
#include <asm/cputype.h>
#endif
asmlinkage void chacha20_arm(u8 *out, const u8 *in, const size_t len,
const u32 key[8], const u32 counter[4]);
#if defined(CONFIG_ARM)
asmlinkage void hchacha20_arm(const u32 state[16], u32 out[8]);
#endif
#if defined(CONFIG_KERNEL_MODE_NEON)
asmlinkage void chacha20_neon(u8 *out, const u8 *in, const size_t len,
const u32 key[8], const u32 counter[4]);
#endif
static bool chacha20_use_neon __ro_after_init;
static void __init chacha20_fpu_init(void)
{
#if defined(CONFIG_ARM64)
chacha20_use_neon = elf_hwcap & HWCAP_ASIMD;
#elif defined(CONFIG_ARM)
switch (read_cpuid_part()) {
case ARM_CPU_PART_CORTEX_A7:
case ARM_CPU_PART_CORTEX_A5:
/* The Cortex-A7 and Cortex-A5 do not perform well with the NEON
* implementation but do incredibly with the scalar one and use
* less power.
*/
break;
default:
chacha20_use_neon = elf_hwcap & HWCAP_NEON;
}
#endif
}
static inline bool chacha20_arch(struct chacha20_ctx *state, u8 *dst,
const u8 *src, size_t len,
simd_context_t *simd_context)
{
#if defined(CONFIG_KERNEL_MODE_NEON)
if (chacha20_use_neon && len >= CHACHA20_BLOCK_SIZE * 3 &&
simd_use(simd_context))
chacha20_neon(dst, src, len, state->key, state->counter);
else
#endif
chacha20_arm(dst, src, len, state->key, state->counter);
state->counter[0] += (len + 63) / 64;
return true;
}
static inline bool hchacha20_arch(u8 *derived_key, const u8 *nonce,
const u8 *key, simd_context_t *simd_context)
{
#if defined(CONFIG_ARM)
u32 x[] = { CHACHA20_CONSTANT_EXPA,
CHACHA20_CONSTANT_ND_3,
CHACHA20_CONSTANT_2_BY,
CHACHA20_CONSTANT_TE_K,
get_unaligned_le32(key + 0),
get_unaligned_le32(key + 4),
get_unaligned_le32(key + 8),
get_unaligned_le32(key + 12),
get_unaligned_le32(key + 16),
get_unaligned_le32(key + 20),
get_unaligned_le32(key + 24),
get_unaligned_le32(key + 28),
get_unaligned_le32(nonce + 0),
get_unaligned_le32(nonce + 4),
get_unaligned_le32(nonce + 8),
get_unaligned_le32(nonce + 12)
};
hchacha20_arm(x, (u32 *)derived_key);
return true;
#else
return false;
#endif
}
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