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// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include <asm/hwcap.h>
#include <asm/neon.h>
asmlinkage void poly1305_init_arm(void *ctx, const u8 key[16]);
asmlinkage void poly1305_blocks_arm(void *ctx, const u8 *inp, const size_t len,
const u32 padbit);
asmlinkage void poly1305_emit_arm(void *ctx, u8 mac[16], const u32 nonce[4]);
asmlinkage void poly1305_blocks_neon(void *ctx, const u8 *inp, const size_t len,
const u32 padbit);
asmlinkage void poly1305_emit_neon(void *ctx, u8 mac[16], const u32 nonce[4]);
static bool poly1305_use_neon __ro_after_init;
static bool *const poly1305_nobs[] __initconst = { &poly1305_use_neon };
static void __init poly1305_fpu_init(void)
{
#if defined(CONFIG_ZINC_ARCH_ARM64)
poly1305_use_neon = elf_hwcap & HWCAP_ASIMD;
#elif defined(CONFIG_ZINC_ARCH_ARM)
poly1305_use_neon = elf_hwcap & HWCAP_NEON;
#endif
}
static inline bool poly1305_init_arch(void *ctx,
const u8 key[POLY1305_KEY_SIZE])
{
poly1305_init_arm(ctx, key);
return true;
}
static inline bool poly1305_blocks_arch(void *ctx, const u8 *inp,
size_t len, const u32 padbit,
simd_context_t *simd_context)
{
/* SIMD disables preemption, so relax after processing each page. */
BUILD_BUG_ON(PAGE_SIZE < POLY1305_BLOCK_SIZE ||
PAGE_SIZE % POLY1305_BLOCK_SIZE);
if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !poly1305_use_neon ||
!simd_use(simd_context)) {
convert_to_base2_64(ctx);
poly1305_blocks_arm(ctx, inp, len, padbit);
return true;
}
for (;;) {
const size_t bytes = min_t(size_t, len, PAGE_SIZE);
poly1305_blocks_neon(ctx, inp, bytes, padbit);
len -= bytes;
if (!len)
break;
inp += bytes;
simd_relax(simd_context);
}
return true;
}
static inline bool poly1305_emit_arch(void *ctx, u8 mac[POLY1305_MAC_SIZE],
const u32 nonce[4],
simd_context_t *simd_context)
{
if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !poly1305_use_neon ||
!simd_use(simd_context)) {
convert_to_base2_64(ctx);
poly1305_emit_arm(ctx, mac, nonce);
} else
poly1305_emit_neon(ctx, mac, nonce);
return true;
}
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