X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Freed_solomon%2Freed_solomon.c;h=f8ac9fa95de12cde5f786c46aca67ffdb343b0bb;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=87d425929b11a69dd41c71c50c41ac96ddb7804b;hpb=87fc8d1bb10cd459024a742c6a10961fefcef18f;p=linux-2.6.git diff --git a/lib/reed_solomon/reed_solomon.c b/lib/reed_solomon/reed_solomon.c index 87d425929..f8ac9fa95 100644 --- a/lib/reed_solomon/reed_solomon.c +++ b/lib/reed_solomon/reed_solomon.c @@ -1,40 +1,40 @@ -/* +/* * lib/reed_solomon/rslib.c * * Overview: * Generic Reed Solomon encoder / decoder library - * + * * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de) * * Reed Solomon code lifted from reed solomon library written by Phil Karn * Copyright 2002 Phil Karn, KA9Q * - * $Id: rslib.c,v 1.4 2004/10/05 22:07:53 gleixner Exp $ + * $Id: rslib.c,v 1.7 2005/11/07 11:14:59 gleixner Exp $ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Description: - * + * * The generic Reed Solomon library provides runtime configurable * encoding / decoding of RS codes. * Each user must call init_rs to get a pointer to a rs_control * structure for the given rs parameters. This structure is either * generated or a already available matching control structure is used. - * If a structure is generated then the polynominal arrays for + * If a structure is generated then the polynomial arrays for * fast encoding / decoding are built. This can take some time so - * make sure not to call this function from a timecritical path. - * Usually a module / driver should initialize the neccecary + * make sure not to call this function from a time critical path. + * Usually a module / driver should initialize the necessary * rs_control structure on module / driver init and release it * on exit. - * The encoding puts the calculated syndrome into a given syndrom - * buffer. + * The encoding puts the calculated syndrome into a given syndrome + * buffer. * The decoding is a two step process. The first step calculates - * the syndrome over the received (data + syndrom) and calls the + * the syndrome over the received (data + syndrome) and calls the * second stage, which does the decoding / error correction itself. - * Many hw encoders provide a syndrom calculation over the received - * data + syndrom and can call the second stage directly. + * Many hw encoders provide a syndrome calculation over the received + * data + syndrome and can call the second stage directly. * */ @@ -44,14 +44,15 @@ #include #include #include +#include #include /* This list holds all currently allocated rs control structures */ static LIST_HEAD (rslist); /* Protection for the list */ -static DECLARE_MUTEX(rslistlock); +static DEFINE_MUTEX(rslistlock); -/** +/** * rs_init - Initialize a Reed-Solomon codec * * @symsize: symbol size, bits (1-8) @@ -63,7 +64,7 @@ static DECLARE_MUTEX(rslistlock); * Allocate a control structure and the polynom arrays for faster * en/decoding. Fill the arrays according to the given parameters */ -static struct rs_control *rs_init(int symsize, int gfpoly, int fcr, +static struct rs_control *rs_init(int symsize, int gfpoly, int fcr, int prim, int nroots) { struct rs_control *rs; @@ -124,15 +125,15 @@ static struct rs_control *rs_init(int symsize, int gfpoly, int fcr, /* Multiply rs->genpoly[] by @**(root + x) */ for (j = i; j > 0; j--) { if (rs->genpoly[j] != 0) { - rs->genpoly[j] = rs->genpoly[j -1] ^ - rs->alpha_to[rs_modnn(rs, + rs->genpoly[j] = rs->genpoly[j -1] ^ + rs->alpha_to[rs_modnn(rs, rs->index_of[rs->genpoly[j]] + root)]; } else rs->genpoly[j] = rs->genpoly[j - 1]; } /* rs->genpoly[0] can never be zero */ - rs->genpoly[0] = - rs->alpha_to[rs_modnn(rs, + rs->genpoly[0] = + rs->alpha_to[rs_modnn(rs, rs->index_of[rs->genpoly[0]] + root)]; } /* convert rs->genpoly[] to index form for quicker encoding */ @@ -153,7 +154,7 @@ errrs: } -/** +/** * free_rs - Free the rs control structure, if its not longer used * * @rs: the control structure which is not longer used by the @@ -161,7 +162,7 @@ errrs: */ void free_rs(struct rs_control *rs) { - down(&rslistlock); + mutex_lock(&rslistlock); rs->users--; if(!rs->users) { list_del(&rs->list); @@ -170,22 +171,22 @@ void free_rs(struct rs_control *rs) kfree(rs->genpoly); kfree(rs); } - up(&rslistlock); + mutex_unlock(&rslistlock); } -/** +/** * init_rs - Find a matching or allocate a new rs control structure * * @symsize: the symbol size (number of bits) * @gfpoly: the extended Galois field generator polynomial coefficients, * with the 0th coefficient in the low order bit. The polynomial * must be primitive; - * @fcr: the first consecutive root of the rs code generator polynomial + * @fcr: the first consecutive root of the rs code generator polynomial * in index form * @prim: primitive element to generate polynomial roots * @nroots: RS code generator polynomial degree (number of roots) */ -struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim, +struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim, int nroots) { struct list_head *tmp; @@ -198,10 +199,10 @@ struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim, return NULL; if (prim <= 0 || prim >= (1<= (1< 8) + if (nroots < 0 || nroots >= (1<gfpoly) continue; if (fcr != rs->fcr) - continue; + continue; if (prim != rs->prim) - continue; + continue; if (nroots != rs->nroots) continue; /* We have a matching one already */ @@ -227,18 +228,18 @@ struct rs_control *init_rs(int symsize, int gfpoly, int fcr, int prim, rs->users = 1; list_add(&rs->list, &rslist); } -out: - up(&rslistlock); +out: + mutex_unlock(&rslistlock); return rs; } #ifdef CONFIG_REED_SOLOMON_ENC8 -/** +/** * encode_rs8 - Calculate the parity for data values (8bit data width) * * @rs: the rs control structure * @data: data field of a given type - * @len: data length + * @len: data length * @par: parity data, must be initialized by caller (usually all 0) * @invmsk: invert data mask (will be xored on data) * @@ -246,7 +247,7 @@ out: * symbol size > 8. The calling code must take care of encoding of the * syndrome result for storage itself. */ -int encode_rs8(struct rs_control *rs, uint8_t *data, int len, uint16_t *par, +int encode_rs8(struct rs_control *rs, uint8_t *data, int len, uint16_t *par, uint16_t invmsk) { #include "encode_rs.c" @@ -255,7 +256,7 @@ EXPORT_SYMBOL_GPL(encode_rs8); #endif #ifdef CONFIG_REED_SOLOMON_DEC8 -/** +/** * decode_rs8 - Decode codeword (8bit data width) * * @rs: the rs control structure @@ -273,7 +274,7 @@ EXPORT_SYMBOL_GPL(encode_rs8); * syndrome result and the received parity before calling this code. */ int decode_rs8(struct rs_control *rs, uint8_t *data, uint16_t *par, int len, - uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk, + uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk, uint16_t *corr) { #include "decode_rs.c" @@ -287,13 +288,13 @@ EXPORT_SYMBOL_GPL(decode_rs8); * * @rs: the rs control structure * @data: data field of a given type - * @len: data length + * @len: data length * @par: parity data, must be initialized by caller (usually all 0) * @invmsk: invert data mask (will be xored on data, not on parity!) * * Each field in the data array contains up to symbol size bits of valid data. */ -int encode_rs16(struct rs_control *rs, uint16_t *data, int len, uint16_t *par, +int encode_rs16(struct rs_control *rs, uint16_t *data, int len, uint16_t *par, uint16_t invmsk) { #include "encode_rs.c" @@ -302,7 +303,7 @@ EXPORT_SYMBOL_GPL(encode_rs16); #endif #ifdef CONFIG_REED_SOLOMON_DEC16 -/** +/** * decode_rs16 - Decode codeword (16bit data width) * * @rs: the rs control structure @@ -312,13 +313,13 @@ EXPORT_SYMBOL_GPL(encode_rs16); * @s: syndrome data field (if NULL, syndrome is calculated) * @no_eras: number of erasures * @eras_pos: position of erasures, can be NULL - * @invmsk: invert data mask (will be xored on data, not on parity!) + * @invmsk: invert data mask (will be xored on data, not on parity!) * @corr: buffer to store correction bitmask on eras_pos * * Each field in the data array contains up to symbol size bits of valid data. */ int decode_rs16(struct rs_control *rs, uint16_t *data, uint16_t *par, int len, - uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk, + uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk, uint16_t *corr) { #include "decode_rs.c"