46 lines
1.0 KiB
C
46 lines
1.0 KiB
C
/*
|
|
* Copyright (c) 2021, Arm Limited. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*/
|
|
|
|
#include <stdarg.h>
|
|
#include <assert.h>
|
|
|
|
#include <arm_acle.h>
|
|
#include <common/debug.h>
|
|
#include <common/tf_crc32.h>
|
|
|
|
/* compute CRC using Arm intrinsic function
|
|
*
|
|
* This function is useful for the platforms with the CPU ARMv8.0
|
|
* (with CRC instructions supported), and onwards.
|
|
* Platforms with CPU ARMv8.0 should make sure to add a compile switch
|
|
* '-march=armv8-a+crc" for successful compilation of this file.
|
|
*
|
|
* @crc: previous accumulated CRC
|
|
* @buf: buffer base address
|
|
* @size: the size of the buffer
|
|
*
|
|
* Return calculated CRC value
|
|
*/
|
|
uint32_t tf_crc32(uint32_t crc, const unsigned char *buf, size_t size)
|
|
{
|
|
assert(buf != NULL);
|
|
|
|
uint32_t calc_crc = ~crc;
|
|
const unsigned char *local_buf = buf;
|
|
size_t local_size = size;
|
|
|
|
/*
|
|
* calculate CRC over byte data
|
|
*/
|
|
while (local_size != 0UL) {
|
|
calc_crc = __crc32b(calc_crc, *local_buf);
|
|
local_buf++;
|
|
local_size--;
|
|
}
|
|
|
|
return ~calc_crc;
|
|
}
|