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103 lines
2.6 KiB
103 lines
2.6 KiB
// Copyright (c) 2018, Arm Limited and affiliates. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "util/crc32c_arm64.h"
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#if defined(__linux__) && defined(HAVE_ARM64_CRC)
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#include <asm/hwcap.h>
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#include <sys/auxv.h>
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#ifndef HWCAP_CRC32
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#define HWCAP_CRC32 (1 << 7)
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#endif
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uint32_t crc32c_runtime_check(void) {
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uint64_t auxv = getauxval(AT_HWCAP);
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return (auxv & HWCAP_CRC32) != 0;
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}
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uint32_t crc32c_arm64(uint32_t crc, unsigned char const *data,
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unsigned len) {
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const uint8_t *buf8;
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const uint64_t *buf64 = (uint64_t *)data;
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int length = (int)len;
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crc ^= 0xffffffff;
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#ifdef HAVE_ARM64_CRYPTO
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/* Crc32c Parallel computation
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* Algorithm comes from Intel whitepaper:
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* crc-iscsi-polynomial-crc32-instruction-paper
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*
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* Input data is divided into three equal-sized blocks
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* Three parallel blocks (crc0, crc1, crc2) for 1024 Bytes
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* One Block: 42(BLK_LENGTH) * 8(step length: crc32c_u64) bytes
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*/
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#define BLK_LENGTH 42
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while (length >= 1024) {
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uint64_t t0, t1;
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uint32_t crc0 = 0, crc1 = 0, crc2 = 0;
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/* Parallel Param:
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* k0 = CRC32(x ^ (42 * 8 * 8 * 2 - 1));
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* k1 = CRC32(x ^ (42 * 8 * 8 - 1));
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*/
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uint32_t k0 = 0xe417f38a, k1 = 0x8f158014;
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/* First 8 bytei for better pipelining */
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crc0 = crc32c_u64(crc, *buf64++);
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/* 3 blocks crc32c parallel computation
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*
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* 42 * 8 * 3 = 1008 (bytes)
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*/
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for (int i = 0; i < BLK_LENGTH; i++, buf64++) {
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crc0 = crc32c_u64(crc0, *buf64);
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crc1 = crc32c_u64(crc1, *(buf64 + BLK_LENGTH));
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crc2 = crc32c_u64(crc2, *(buf64 + (BLK_LENGTH * 2)));
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}
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buf64 += (BLK_LENGTH * 2);
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/* Last 8 bytes */
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crc = crc32c_u64(crc2, *buf64++);
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t0 = (uint64_t)vmull_p64(crc0, k0);
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t1 = (uint64_t)vmull_p64(crc1, k1);
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/* Merge (crc0, crc1, crc2) -> crc */
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crc1 = crc32c_u64(0, t1);
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crc ^= crc1;
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crc0 = crc32c_u64(0, t0);
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crc ^= crc0;
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length -= 1024;
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}
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#endif
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buf8 = (const uint8_t *)buf64;
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while (length >= 8) {
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crc = crc32c_u64(crc, *(const uint64_t*)buf8);
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buf8 += 8;
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length -= 8;
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}
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/* The following is more efficient than the straight loop */
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if (length >= 4) {
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crc = crc32c_u32(crc, *(const uint32_t*)buf8);
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buf8 += 4;
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length -= 4;
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}
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if (length >= 2) {
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crc = crc32c_u16(crc, *(const uint16_t*)buf8);
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buf8 += 2;
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length -= 2;
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}
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if (length >= 1)
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crc = crc32c_u8(crc, *buf8);
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crc ^= 0xffffffff;
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return crc;
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}
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#endif
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