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https://github.com/ARM-software/arm-trusted-firmware.git
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a1cedadf73
Added support for HW computed CRC using Arm ACLE intrinsics. These are built-in intrinsics available for ARMv8.1-A, and onwards. These intrinsics are enabled via '-march=armv8-a+crc' compile switch for ARMv8-A (supports CRC instructions optionally). HW CRC support is enabled unconditionally in BL2 for all Arm platforms. HW CRC calculation is verified offline to ensure a similar result as its respective ZLib utility function. HW CRC calculation support will be used in the upcoming firmware update patches. Change-Id: Ia2ae801f62d2003e89a9c3e6d77469b5312614b3 Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
44 lines
1,009 B
C
44 lines
1,009 B
C
/*
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* Copyright (c) 2021, Arm Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stdarg.h>
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#include <assert.h>
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#include <arm_acle.h>
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#include <common/debug.h>
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/* hw_crc32 - compute CRC using Arm intrinsic function
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*
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* This function is useful for the platforms with the CPU ARMv8.0
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* (with CRC instructions supported), and onwards.
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* Platforms with CPU ARMv8.0 should make sure to add a compile switch
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* '-march=armv8-a+crc" for successful compilation of this file.
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*
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* @crc: previous accumulated CRC
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* @buf: buffer base address
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* @size: the size of the buffer
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*
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* Return calculated CRC value
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*/
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uint32_t hw_crc32(uint32_t crc, const unsigned char *buf, size_t size)
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{
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assert(buf != NULL);
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uint32_t calc_crc = ~crc;
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const unsigned char *local_buf = buf;
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size_t local_size = size;
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/*
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* calculate CRC over byte data
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*/
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while (local_size != 0UL) {
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calc_crc = __crc32b(calc_crc, *local_buf);
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local_buf++;
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local_size--;
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}
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return ~calc_crc;
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}
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