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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* GHASH, arm optimized
*
* Copyright 2026 Google LLC
*/
#include <asm/hwcap.h>
#include <asm/neon.h>
#include <asm/simd.h>
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
void pmull_ghash_update_p8(size_t blocks, struct polyval_elem *dg,
const u8 *src, const struct polyval_elem *h);
#define ghash_blocks_arch ghash_blocks_arch
static void ghash_blocks_arch(struct polyval_elem *acc,
const struct ghash_key *key,
const u8 *data, size_t nblocks)
{
if (static_branch_likely(&have_neon) && may_use_simd()) {
do {
/* Allow rescheduling every 4 KiB. */
size_t n =
min_t(size_t, nblocks, 4096 / GHASH_BLOCK_SIZE);
scoped_ksimd()
pmull_ghash_update_p8(n, acc, data, &key->h);
data += n * GHASH_BLOCK_SIZE;
nblocks -= n;
} while (nblocks);
} else {
ghash_blocks_generic(acc, &key->h, data, nblocks);
}
}
#define gf128hash_mod_init_arch gf128hash_mod_init_arch
static void gf128hash_mod_init_arch(void)
{
if (elf_hwcap & HWCAP_NEON)
static_branch_enable(&have_neon);
}
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