Quelle  sha256.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * SHA-256 Secure Hash Algorithm.
 *
 * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
 *
 * Based on crypto/sha256_generic.c, which is:
 *
 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
 */

#include <asm/octeon/crypto.h>
#include <asm/octeon/octeon.h>

/*
 * We pass everything as 64-bit. OCTEON can handle misaligned data.
 */

static void sha256_blocks(struct sha256_block_state *state,
     const u8 *data, size_t nblocks)
{
 struct octeon_cop2_state cop2_state;
 u64 *state64 = (u64 *)state;
 unsigned long flags;

 if (!octeon_has_crypto())
  return sha256_blocks_generic(state, data, nblocks);

 flags = octeon_crypto_enable(&cop2_state);
 write_octeon_64bit_hash_dword(state64[0], 0);
 write_octeon_64bit_hash_dword(state64[1], 1);
 write_octeon_64bit_hash_dword(state64[2], 2);
 write_octeon_64bit_hash_dword(state64[3], 3);

 do {
  const u64 *block = (const u64 *)data;

  write_octeon_64bit_block_dword(block[0], 0);
  write_octeon_64bit_block_dword(block[1], 1);
  write_octeon_64bit_block_dword(block[2], 2);
  write_octeon_64bit_block_dword(block[3], 3);
  write_octeon_64bit_block_dword(block[4], 4);
  write_octeon_64bit_block_dword(block[5], 5);
  write_octeon_64bit_block_dword(block[6], 6);
  octeon_sha256_start(block[7]);

  data += SHA256_BLOCK_SIZE;
 } while (--nblocks);

 state64[0] = read_octeon_64bit_hash_dword(0);
 state64[1] = read_octeon_64bit_hash_dword(1);
 state64[2] = read_octeon_64bit_hash_dword(2);
 state64[3] = read_octeon_64bit_hash_dword(3);
 octeon_crypto_disable(&cop2_state, flags);
}