https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: def9d2780727cec3313ed3522d0123158d87224d authored by Linus Torvalds on 20 January 2020, 00:02:49 UTC
Linux 5.5-rc7
Linux 5.5-rc7
Tip revision: def9d27
bch.h
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Generic binary BCH encoding/decoding library
*
* Copyright © 2011 Parrot S.A.
*
* Author: Ivan Djelic <ivan.djelic@parrot.com>
*
* Description:
*
* This library provides runtime configurable encoding/decoding of binary
* Bose-Chaudhuri-Hocquenghem (BCH) codes.
*/
#ifndef _BCH_H
#define _BCH_H
#include <linux/types.h>
/**
* struct bch_control - BCH control structure
* @m: Galois field order
* @n: maximum codeword size in bits (= 2^m-1)
* @t: error correction capability in bits
* @ecc_bits: ecc exact size in bits, i.e. generator polynomial degree (<=m*t)
* @ecc_bytes: ecc max size (m*t bits) in bytes
* @a_pow_tab: Galois field GF(2^m) exponentiation lookup table
* @a_log_tab: Galois field GF(2^m) log lookup table
* @mod8_tab: remainder generator polynomial lookup tables
* @ecc_buf: ecc parity words buffer
* @ecc_buf2: ecc parity words buffer
* @xi_tab: GF(2^m) base for solving degree 2 polynomial roots
* @syn: syndrome buffer
* @cache: log-based polynomial representation buffer
* @elp: error locator polynomial
* @poly_2t: temporary polynomials of degree 2t
*/
struct bch_control {
unsigned int m;
unsigned int n;
unsigned int t;
unsigned int ecc_bits;
unsigned int ecc_bytes;
/* private: */
uint16_t *a_pow_tab;
uint16_t *a_log_tab;
uint32_t *mod8_tab;
uint32_t *ecc_buf;
uint32_t *ecc_buf2;
unsigned int *xi_tab;
unsigned int *syn;
int *cache;
struct gf_poly *elp;
struct gf_poly *poly_2t[4];
};
struct bch_control *init_bch(int m, int t, unsigned int prim_poly);
void free_bch(struct bch_control *bch);
void encode_bch(struct bch_control *bch, const uint8_t *data,
unsigned int len, uint8_t *ecc);
int decode_bch(struct bch_control *bch, const uint8_t *data, unsigned int len,
const uint8_t *recv_ecc, const uint8_t *calc_ecc,
const unsigned int *syn, unsigned int *errloc);
#endif /* _BCH_H */