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https://github.com/brain-hackers/u-boot-brain
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51c2345bd2
The CRC16-CCITT checksum function is useful for space-constrained applications (such as obtaining a checksum across a 2KBit or 4KBit EEPROM) in boot applications. It has not been accessible from boot scripts until now (due to not having a dedicated command and not being supported by the hash infrstructure) limiting its applicability outside of custom commands. This adds the CRC16-CCITT (poly 0x1021, init 0x0) algorithm to the list of available hashes and adds a new crc16_ccitt_wd_buf() to make this possible. Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com> [trini: Fix building crc16.o for SPL/TPL] Signed-off-by: Tom Rini <trini@konsulko.com>
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2009
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* Marvell Semiconductor <www.marvell.com>
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* Written-by: Prafulla Wadaskar <prafulla@marvell.com>
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*/
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#ifndef _UBOOT_CRC_H
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#define _UBOOT_CRC_H
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/* lib/crc8.c */
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unsigned int crc8(unsigned int crc_start, const unsigned char *vptr, int len);
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/* lib/crc16.c - 16 bit CRC with polynomial x^16+x^12+x^5+1 (CRC-CCITT) */
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uint16_t crc16_ccitt(uint16_t crc_start, const unsigned char *s, int len);
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/**
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* crc16_ccitt_wd_buf - Perform CRC16-CCIT on an input buffer and return the
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* 16-bit result (network byte-order) in an output buffer
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*
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* @in: input buffer
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* @len: input buffer length
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* @out: output buffer (at least 2 bytes)
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* @chunk_sz: ignored
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*/
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void crc16_ccitt_wd_buf(const uint8_t *in, uint len,
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uint8_t *out, uint chunk_sz);
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/* lib/crc32.c */
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uint32_t crc32 (uint32_t, const unsigned char *, uint);
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uint32_t crc32_wd (uint32_t, const unsigned char *, uint, uint);
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uint32_t crc32_no_comp (uint32_t, const unsigned char *, uint);
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/**
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* crc32_wd_buf - Perform CRC32 on a buffer and return result in buffer
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*
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* @input: Input buffer
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* @ilen: Input buffer length
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* @output: Place to put checksum result (4 bytes)
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* @chunk_sz: Trigger watchdog after processing this many bytes
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*/
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void crc32_wd_buf(const unsigned char *input, uint ilen,
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unsigned char *output, uint chunk_sz);
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/* lib/crc32c.c */
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void crc32c_init(uint32_t *, uint32_t);
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uint32_t crc32c_cal(uint32_t, const char *, int, uint32_t *);
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#endif /* _UBOOT_CRC_H */
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