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author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-09 13:10:11 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-09 13:10:11 -0700 |
commit | ba7cc09c9c9e29a57045dc5bbf843ac1cfad3283 (patch) | |
tree | 7e2d39269803b53ba048f3bad11cd6a1a38b35b9 /drivers/mtd/nand/cafe_ecc.c | |
parent | d84c4124c4b6611301b402e8611b7e36de3bd351 (diff) | |
parent | b7aa48be1e7a11e36448a7db58931bbf735d2718 (diff) | |
download | blackbird-op-linux-ba7cc09c9c9e29a57045dc5bbf843ac1cfad3283.tar.gz blackbird-op-linux-ba7cc09c9c9e29a57045dc5bbf843ac1cfad3283.zip |
Merge git://git.infradead.org/mtd-2.6
* git://git.infradead.org/mtd-2.6: (21 commits)
[MTD] [CHIPS] Remove MTD_OBSOLETE_CHIPS (jedec, amd_flash, sharp)
[MTD] Delete allegedly obsolete "bank_size" field of mtd_info.
[MTD] Remove unnecessary user space check from mtd.h.
[MTD] [MAPS] Remove flash maps for no longer supported 405LP boards
[MTD] [MAPS] Fix missing printk() parameter in physmap_of.c MTD driver
[MTD] [NAND] platform NAND driver: add driver
[MTD] [NAND] platform NAND driver: update header
[JFFS2] Simplify and clean up jffs2_add_tn_to_tree() some more.
[JFFS2] Remove another bogus optimisation in jffs2_add_tn_to_tree()
[JFFS2] Remove broken insert_point optimisation in jffs2_add_tn_to_tree()
[JFFS2] Remember to calculate overlap on nodes which replace older nodes
[JFFS2] Don't advance c->wbuf_ofs to next eraseblock after wbuf flush
[MTD] [NAND] at91_nand.c: CMDLINE_PARTS support
[MTD] [NAND] Tidy up handling of page number in nand_block_bad()
[MTD] block2mtd_paramline[] mustn't be __initdata
[MTD] [NAND] Support multiple chips in CAFÉ driver
[MTD] [NAND] Rename cafe.c to cafe_nand.c and remove the multi-obj magic
[MTD] [NAND] Use rslib for CAFÉ ECC
[RSLIB] Support non-canonical GF representations
[JFFS2] Remove dead file histo_mips.h
...
Diffstat (limited to 'drivers/mtd/nand/cafe_ecc.c')
-rw-r--r-- | drivers/mtd/nand/cafe_ecc.c | 1381 |
1 files changed, 0 insertions, 1381 deletions
diff --git a/drivers/mtd/nand/cafe_ecc.c b/drivers/mtd/nand/cafe_ecc.c deleted file mode 100644 index ea5c8491d2c5..000000000000 --- a/drivers/mtd/nand/cafe_ecc.c +++ /dev/null @@ -1,1381 +0,0 @@ -/* Error correction for CAFÉ NAND controller - * - * © 2006 Marvell, Inc. - * Author: Tom Chiou - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the Free - * Software Foundation; either version 2 of the License, or (at your option) - * any later version. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., 59 - * Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/errno.h> - -static unsigned short gf4096_mul(unsigned short, unsigned short); -static unsigned short gf64_mul(unsigned short, unsigned short); -static unsigned short gf4096_inv(unsigned short); -static unsigned short err_pos(unsigned short); -static void find_4bit_err_coefs(unsigned short, unsigned short, unsigned short, - unsigned short, unsigned short, unsigned short, - unsigned short, unsigned short, unsigned short *); -static void zero_4x5_col3(unsigned short[4][5]); -static void zero_4x5_col2(unsigned short[4][5]); -static void zero_4x5_col1(unsigned short[4][5]); -static void swap_4x5_rows(unsigned short[4][5], int, int, int); -static void swap_2x3_rows(unsigned short m[2][3]); -static void solve_4x5(unsigned short m[4][5], unsigned short *, int *); -static void sort_coefs(int *, unsigned short *, int); -static void find_4bit_err_pats(unsigned short, unsigned short, unsigned short, - unsigned short, unsigned short, unsigned short, - unsigned short, unsigned short, unsigned short *); -static void find_3bit_err_coefs(unsigned short, unsigned short, unsigned short, - unsigned short, unsigned short, unsigned short, - unsigned short *); -static void zero_3x4_col2(unsigned short[3][4]); -static void zero_3x4_col1(unsigned short[3][4]); -static void swap_3x4_rows(unsigned short[3][4], int, int, int); -static void solve_3x4(unsigned short[3][4], unsigned short *, int *); -static void find_3bit_err_pats(unsigned short, unsigned short, unsigned short, - unsigned short, unsigned short, unsigned short, - unsigned short *); - -static void find_2bit_err_pats(unsigned short, unsigned short, unsigned short, - unsigned short, unsigned short *); -static void find_2x2_soln(unsigned short, unsigned short, unsigned short, - unsigned short, unsigned short, unsigned short, - unsigned short *); -static void solve_2x3(unsigned short[2][3], unsigned short *); -static int chk_no_err_only(unsigned short *, unsigned short *); -static int chk_1_err_only(unsigned short *, unsigned short *); -static int chk_2_err_only(unsigned short *, unsigned short *); -static int chk_3_err_only(unsigned short *, unsigned short *); -static int chk_4_err_only(unsigned short *, unsigned short *); - -static unsigned short gf64_mul(unsigned short a, unsigned short b) -{ - unsigned short tmp1, tmp2, tmp3, tmp4, tmp5; - unsigned short c_bit0, c_bit1, c_bit2, c_bit3, c_bit4, c_bit5, c; - - tmp1 = ((a) ^ (a >> 5)); - tmp2 = ((a >> 4) ^ (a >> 5)); - tmp3 = ((a >> 3) ^ (a >> 4)); - tmp4 = ((a >> 2) ^ (a >> 3)); - tmp5 = ((a >> 1) ^ (a >> 2)); - - c_bit0 = ((a & b) ^ ((a >> 5) & (b >> 1)) ^ ((a >> 4) & (b >> 2)) ^ - ((a >> 3) & (b >> 3)) ^ ((a >> 2) & (b >> 4)) ^ ((a >> 1) & (b >> 5))) & 0x1; - - c_bit1 = (((a >> 1) & b) ^ (tmp1 & (b >> 1)) ^ (tmp2 & (b >> 2)) ^ - (tmp3 & (b >> 3)) ^ (tmp4 & (b >> 4)) ^ (tmp5 & (b >> 5))) & 0x1; - - c_bit2 = (((a >> 2) & b) ^ ((a >> 1) & (b >> 1)) ^ (tmp1 & (b >> 2)) ^ - (tmp2 & (b >> 3)) ^ (tmp3 & (b >> 4)) ^ (tmp4 & (b >> 5))) & 0x1; - - c_bit3 = (((a >> 3) & b) ^ ((a >> 2) & (b >> 1)) ^ ((a >> 1) & (b >> 2)) ^ - (tmp1 & (b >> 3)) ^ (tmp2 & (b >> 4)) ^ (tmp3 & (b >> 5))) & 0x1; - - c_bit4 = (((a >> 4) & b) ^ ((a >> 3) & (b >> 1)) ^ ((a >> 2) & (b >> 2)) ^ - ((a >> 1) & (b >> 3)) ^ (tmp1 & (b >> 4)) ^ (tmp2 & (b >> 5))) & 0x1; - - c_bit5 = (((a >> 5) & b) ^ ((a >> 4) & (b >> 1)) ^ ((a >> 3) & (b >> 2)) ^ - ((a >> 2) & (b >> 3)) ^ ((a >> 1) & (b >> 4)) ^ (tmp1 & (b >> 5))) & 0x1; - - c = c_bit0 | (c_bit1 << 1) | (c_bit2 << 2) | (c_bit3 << 3) | (c_bit4 << 4) | (c_bit5 << 5); - - return c; -} - -static unsigned short gf4096_mul(unsigned short a, unsigned short b) -{ - unsigned short ah, al, bh, bl, alxah, blxbh, ablh, albl, ahbh, ahbhB, c; - - ah = (a >> 6) & 0x3f; - al = a & 0x3f; - bh = (b >> 6) & 0x3f; - bl = b & 0x3f; - alxah = al ^ ah; - blxbh = bl ^ bh; - - ablh = gf64_mul(alxah, blxbh); - albl = gf64_mul(al, bl); - ahbh = gf64_mul(ah, bh); - - ahbhB = ((ahbh & 0x1) << 5) | - ((ahbh & 0x20) >> 1) | - ((ahbh & 0x10) >> 1) | ((ahbh & 0x8) >> 1) | ((ahbh & 0x4) >> 1) | (((ahbh >> 1) ^ ahbh) & 0x1); - - c = ((ablh ^ albl) << 6) | (ahbhB ^ albl); - return c; -} - -static void find_2bit_err_pats(unsigned short s0, unsigned short s1, unsigned short r0, unsigned short r1, unsigned short *pats) -{ - find_2x2_soln(0x1, 0x1, r0, r1, s0, s1, pats); -} - -static void find_3bit_err_coefs(unsigned short s0, unsigned short s1, - unsigned short s2, unsigned short s3, unsigned short s4, unsigned short s5, unsigned short *coefs) -{ - unsigned short m[3][4]; - int row_order[3]; - - row_order[0] = 0; - row_order[1] = 1; - row_order[2] = 2; - m[0][0] = s2; - m[0][1] = s1; - m[0][2] = s0; - m[0][3] = s3; - m[1][0] = s3; - m[1][1] = s2; - m[1][2] = s1; - m[1][3] = s4; - m[2][0] = s4; - m[2][1] = s3; - m[2][2] = s2; - m[2][3] = s5; - - if (m[0][2] != 0x0) { - zero_3x4_col2(m); - } else if (m[1][2] != 0x0) { - swap_3x4_rows(m, 0, 1, 4); - zero_3x4_col2(m); - } else if (m[2][2] != 0x0) { - swap_3x4_rows(m, 0, 2, 4); - zero_3x4_col2(m); - } else { - printk(KERN_ERR "Error: find_3bit_err_coefs, s0,s1,s2 all zeros!\n"); - } - - if (m[1][1] != 0x0) { - zero_3x4_col1(m); - } else if (m[2][1] != 0x0) { - swap_3x4_rows(m, 1, 2, 4); - zero_3x4_col1(m); - } else { - printk(KERN_ERR "Error: find_3bit_err_coefs, cannot resolve col 1!\n"); - } - - /* solve coefs */ - solve_3x4(m, coefs, row_order); -} - -static void zero_3x4_col2(unsigned short m[3][4]) -{ - unsigned short minv1, minv2; - - minv1 = gf4096_mul(m[1][2], gf4096_inv(m[0][2])); - minv2 = gf4096_mul(m[2][2], gf4096_inv(m[0][2])); - m[1][0] = m[1][0] ^ gf4096_mul(m[0][0], minv1); - m[1][1] = m[1][1] ^ gf4096_mul(m[0][1], minv1); - m[1][3] = m[1][3] ^ gf4096_mul(m[0][3], minv1); - m[2][0] = m[2][0] ^ gf4096_mul(m[0][0], minv2); - m[2][1] = m[2][1] ^ gf4096_mul(m[0][1], minv2); - m[2][3] = m[2][3] ^ gf4096_mul(m[0][3], minv2); -} - -static void zero_3x4_col1(unsigned short m[3][4]) -{ - unsigned short minv; - minv = gf4096_mul(m[2][1], gf4096_inv(m[1][1])); - m[2][0] = m[2][0] ^ gf4096_mul(m[1][0], minv); - m[2][3] = m[2][3] ^ gf4096_mul(m[1][3], minv); -} - -static void swap_3x4_rows(unsigned short m[3][4], int i, int j, int col_width) -{ - unsigned short tmp0; - int cnt; - for (cnt = 0; cnt < col_width; cnt++) { - tmp0 = m[i][cnt]; - m[i][cnt] = m[j][cnt]; - m[j][cnt] = tmp0; - } -} - -static void solve_3x4(unsigned short m[3][4], unsigned short *coefs, int *row_order) -{ - unsigned short tmp[3]; - tmp[0] = gf4096_mul(m[2][3], gf4096_inv(m[2][0])); - tmp[1] = gf4096_mul((gf4096_mul(tmp[0], m[1][0]) ^ m[1][3]), gf4096_inv(m[1][1])); - tmp[2] = gf4096_mul((gf4096_mul(tmp[0], m[0][0]) ^ gf4096_mul(tmp[1], m[0][1]) ^ m[0][3]), gf4096_inv(m[0][2])); - sort_coefs(row_order, tmp, 3); - coefs[0] = tmp[0]; - coefs[1] = tmp[1]; - coefs[2] = tmp[2]; -} - -static void find_3bit_err_pats(unsigned short s0, unsigned short s1, - unsigned short s2, unsigned short r0, - unsigned short r1, unsigned short r2, - unsigned short *pats) -{ - find_2x2_soln(r0 ^ r2, r1 ^ r2, - gf4096_mul(r0, r0 ^ r2), gf4096_mul(r1, r1 ^ r2), - gf4096_mul(s0, r2) ^ s1, gf4096_mul(s1, r2) ^ s2, pats); - pats[2] = s0 ^ pats[0] ^ pats[1]; -} - -static void find_4bit_err_coefs(unsigned short s0, unsigned short s1, - unsigned short s2, unsigned short s3, - unsigned short s4, unsigned short s5, - unsigned short s6, unsigned short s7, - unsigned short *coefs) -{ - unsigned short m[4][5]; - int row_order[4]; - - row_order[0] = 0; - row_order[1] = 1; - row_order[2] = 2; - row_order[3] = 3; - - m[0][0] = s3; - m[0][1] = s2; - m[0][2] = s1; - m[0][3] = s0; - m[0][4] = s4; - m[1][0] = s4; - m[1][1] = s3; - m[1][2] = s2; - m[1][3] = s1; - m[1][4] = s5; - m[2][0] = s5; - m[2][1] = s4; - m[2][2] = s3; - m[2][3] = s2; - m[2][4] = s6; - m[3][0] = s6; - m[3][1] = s5; - m[3][2] = s4; - m[3][3] = s3; - m[3][4] = s7; - - if (m[0][3] != 0x0) { - zero_4x5_col3(m); - } else if (m[1][3] != 0x0) { - swap_4x5_rows(m, 0, 1, 5); - zero_4x5_col3(m); - } else if (m[2][3] != 0x0) { - swap_4x5_rows(m, 0, 2, 5); - zero_4x5_col3(m); - } else if (m[3][3] != 0x0) { - swap_4x5_rows(m, 0, 3, 5); - zero_4x5_col3(m); - } else { - printk(KERN_ERR "Error: find_4bit_err_coefs, s0,s1,s2,s3 all zeros!\n"); - } - - if (m[1][2] != 0x0) { - zero_4x5_col2(m); - } else if (m[2][2] != 0x0) { - swap_4x5_rows(m, 1, 2, 5); - zero_4x5_col2(m); - } else if (m[3][2] != 0x0) { - swap_4x5_rows(m, 1, 3, 5); - zero_4x5_col2(m); - } else { - printk(KERN_ERR "Error: find_4bit_err_coefs, cannot resolve col 2!\n"); - } - - if (m[2][1] != 0x0) { - zero_4x5_col1(m); - } else if (m[3][1] != 0x0) { - swap_4x5_rows(m, 2, 3, 5); - zero_4x5_col1(m); - } else { - printk(KERN_ERR "Error: find_4bit_err_coefs, cannot resolve col 1!\n"); - } - - solve_4x5(m, coefs, row_order); -} - -static void zero_4x5_col3(unsigned short m[4][5]) -{ - unsigned short minv1, minv2, minv3; - - minv1 = gf4096_mul(m[1][3], gf4096_inv(m[0][3])); - minv2 = gf4096_mul(m[2][3], gf4096_inv(m[0][3])); - minv3 = gf4096_mul(m[3][3], gf4096_inv(m[0][3])); - - m[1][0] = m[1][0] ^ gf4096_mul(m[0][0], minv1); - m[1][1] = m[1][1] ^ gf4096_mul(m[0][1], minv1); - m[1][2] = m[1][2] ^ gf4096_mul(m[0][2], minv1); - m[1][4] = m[1][4] ^ gf4096_mul(m[0][4], minv1); - m[2][0] = m[2][0] ^ gf4096_mul(m[0][0], minv2); - m[2][1] = m[2][1] ^ gf4096_mul(m[0][1], minv2); - m[2][2] = m[2][2] ^ gf4096_mul(m[0][2], minv2); - m[2][4] = m[2][4] ^ gf4096_mul(m[0][4], minv2); - m[3][0] = m[3][0] ^ gf4096_mul(m[0][0], minv3); - m[3][1] = m[3][1] ^ gf4096_mul(m[0][1], minv3); - m[3][2] = m[3][2] ^ gf4096_mul(m[0][2], minv3); - m[3][4] = m[3][4] ^ gf4096_mul(m[0][4], minv3); -} - -static void zero_4x5_col2(unsigned short m[4][5]) -{ - unsigned short minv2, minv3; - - minv2 = gf4096_mul(m[2][2], gf4096_inv(m[1][2])); - minv3 = gf4096_mul(m[3][2], gf4096_inv(m[1][2])); - - m[2][0] = m[2][0] ^ gf4096_mul(m[1][0], minv2); - m[2][1] = m[2][1] ^ gf4096_mul(m[1][1], minv2); - m[2][4] = m[2][4] ^ gf4096_mul(m[1][4], minv2); - m[3][0] = m[3][0] ^ gf4096_mul(m[1][0], minv3); - m[3][1] = m[3][1] ^ gf4096_mul(m[1][1], minv3); - m[3][4] = m[3][4] ^ gf4096_mul(m[1][4], minv3); -} - -static void zero_4x5_col1(unsigned short m[4][5]) -{ - unsigned short minv; - - minv = gf4096_mul(m[3][1], gf4096_inv(m[2][1])); - - m[3][0] = m[3][0] ^ gf4096_mul(m[2][0], minv); - m[3][4] = m[3][4] ^ gf4096_mul(m[2][4], minv); -} - -static void swap_4x5_rows(unsigned short m[4][5], int i, int j, int col_width) -{ - unsigned short tmp0; - int cnt; - - for (cnt = 0; cnt < col_width; cnt++) { - tmp0 = m[i][cnt]; - m[i][cnt] = m[j][cnt]; - m[j][cnt] = tmp0; - } -} - -static void solve_4x5(unsigned short m[4][5], unsigned short *coefs, int *row_order) -{ - unsigned short tmp[4]; - - tmp[0] = gf4096_mul(m[3][4], gf4096_inv(m[3][0])); - tmp[1] = gf4096_mul((gf4096_mul(tmp[0], m[2][0]) ^ m[2][4]), gf4096_inv(m[2][1])); - tmp[2] = gf4096_mul((gf4096_mul(tmp[0], m[1][0]) ^ gf4096_mul(tmp[1], m[1][1]) ^ m[1][4]), gf4096_inv(m[1][2])); - tmp[3] = gf4096_mul((gf4096_mul(tmp[0], m[0][0]) ^ - gf4096_mul(tmp[1], m[0][1]) ^ gf4096_mul(tmp[2], m[0][2]) ^ m[0][4]), gf4096_inv(m[0][3])); - sort_coefs(row_order, tmp, 4); - coefs[0] = tmp[0]; - coefs[1] = tmp[1]; - coefs[2] = tmp[2]; - coefs[3] = tmp[3]; -} - -static void sort_coefs(int *order, unsigned short *soln, int len) -{ - int cnt, start_cnt, least_ord, least_cnt; - unsigned short tmp0; - for (start_cnt = 0; start_cnt < len; start_cnt++) { - for (cnt = start_cnt; cnt < len; cnt++) { - if (cnt == start_cnt) { - least_ord = order[cnt]; - least_cnt = start_cnt; - } else { - if (least_ord > order[cnt]) { - least_ord = order[cnt]; - least_cnt = cnt; - } - } - } - if (least_cnt != start_cnt) { - tmp0 = order[least_cnt]; - order[least_cnt] = order[start_cnt]; - order[start_cnt] = tmp0; - tmp0 = soln[least_cnt]; - soln[least_cnt] = soln[start_cnt]; - soln[start_cnt] = tmp0; - } - } -} - -static void find_4bit_err_pats(unsigned short s0, unsigned short s1, - unsigned short s2, unsigned short s3, - unsigned short z1, unsigned short z2, - unsigned short z3, unsigned short z4, - unsigned short *pats) -{ - unsigned short z4_z1, z3z4_z3z3, z4_z2, s0z4_s1, z1z4_z1z1, - z4_z3, z2z4_z2z2, s1z4_s2, z3z3z4_z3z3z3, z1z1z4_z1z1z1, z2z2z4_z2z2z2, s2z4_s3; - unsigned short tmp0, tmp1, tmp2, tmp3; - - z4_z1 = z4 ^ z1; - z3z4_z3z3 = gf4096_mul(z3, z4) ^ gf4096_mul(z3, z3); - z4_z2 = z4 ^ z2; - s0z4_s1 = gf4096_mul(s0, z4) ^ s1; - z1z4_z1z1 = gf4096_mul(z1, z4) ^ gf4096_mul(z1, z1); - z4_z3 = z4 ^ z3; - z2z4_z2z2 = gf4096_mul(z2, z4) ^ gf4096_mul(z2, z2); - s1z4_s2 = gf4096_mul(s1, z4) ^ s2; - z3z3z4_z3z3z3 = gf4096_mul(gf4096_mul(z3, z3), z4) ^ gf4096_mul(gf4096_mul(z3, z3), z3); - z1z1z4_z1z1z1 = gf4096_mul(gf4096_mul(z1, z1), z4) ^ gf4096_mul(gf4096_mul(z1, z1), z1); - z2z2z4_z2z2z2 = gf4096_mul(gf4096_mul(z2, z2), z4) ^ gf4096_mul(gf4096_mul(z2, z2), z2); - s2z4_s3 = gf4096_mul(s2, z4) ^ s3; - - //find err pat 0,1 - find_2x2_soln(gf4096_mul(z4_z1, z3z4_z3z3) ^ - gf4096_mul(z1z4_z1z1, z4_z3), gf4096_mul(z4_z2, - z3z4_z3z3) ^ - gf4096_mul(z2z4_z2z2, z4_z3), gf4096_mul(z1z4_z1z1, - z3z3z4_z3z3z3) ^ - gf4096_mul(z1z1z4_z1z1z1, z3z4_z3z3), - gf4096_mul(z2z4_z2z2, - z3z3z4_z3z3z3) ^ gf4096_mul(z2z2z4_z2z2z2, - z3z4_z3z3), - gf4096_mul(s0z4_s1, z3z4_z3z3) ^ gf4096_mul(s1z4_s2, - z4_z3), - gf4096_mul(s1z4_s2, z3z3z4_z3z3z3) ^ gf4096_mul(s2z4_s3, z3z4_z3z3), pats); - tmp0 = pats[0]; - tmp1 = pats[1]; - tmp2 = pats[0] ^ pats[1] ^ s0; - tmp3 = gf4096_mul(pats[0], z1) ^ gf4096_mul(pats[1], z2) ^ s1; - - //find err pat 2,3 - find_2x2_soln(0x1, 0x1, z3, z4, tmp2, tmp3, pats); - pats[2] = pats[0]; - pats[3] = pats[1]; - pats[0] = tmp0; - pats[1] = tmp1; -} - -static void find_2x2_soln(unsigned short c00, unsigned short c01, - unsigned short c10, unsigned short c11, - unsigned short lval0, unsigned short lval1, - unsigned short *soln) -{ - unsigned short m[2][3]; - m[0][0] = c00; - m[0][1] = c01; - m[0][2] = lval0; - m[1][0] = c10; - m[1][1] = c11; - m[1][2] = lval1; - - if (m[0][1] != 0x0) { - /* */ - } else if (m[1][1] != 0x0) { - swap_2x3_rows(m); - } else { - printk(KERN_ERR "Warning: find_2bit_err_coefs, s0,s1 all zeros!\n"); - } - - solve_2x3(m, soln); -} - -static void swap_2x3_rows(unsigned short m[2][3]) -{ - unsigned short tmp0; - int cnt; - - for (cnt = 0; cnt < 3; cnt++) { - tmp0 = m[0][cnt]; - m[0][cnt] = m[1][cnt]; - m[1][cnt] = tmp0; - } -} - -static void solve_2x3(unsigned short m[2][3], unsigned short *coefs) -{ - unsigned short minv; - - minv = gf4096_mul(m[1][1], gf4096_inv(m[0][1])); - m[1][0] = m[1][0] ^ gf4096_mul(m[0][0], minv); - m[1][2] = m[1][2] ^ gf4096_mul(m[0][2], minv); - coefs[0] = gf4096_mul(m[1][2], gf4096_inv(m[1][0])); - coefs[1] = gf4096_mul((gf4096_mul(coefs[0], m[0][0]) ^ m[0][2]), gf4096_inv(m[0][1])); -} - -static unsigned char gf64_inv[64] = { - 0, 1, 33, 62, 49, 43, 31, 44, 57, 37, 52, 28, 46, 40, 22, 25, - 61, 54, 51, 39, 26, 35, 14, 24, 23, 15, 20, 34, 11, 53, 45, 6, - 63, 2, 27, 21, 56, 9, 50, 19, 13, 47, 48, 5, 7, 30, 12, 41, - 42, 4, 38, 18, 10, 29, 17, 60, 36, 8, 59, 58, 55, 16, 3, 32 -}; - -static unsigned short gf4096_inv(unsigned short din) -{ - unsigned short alahxal, ah2B, deno, inv, bl, bh; - unsigned short ah, al, ahxal; - unsigned short dout; - - ah = (din >> 6) & 0x3f; - al = din & 0x3f; - ahxal = ah ^ al; - ah2B = (((ah ^ (ah >> 3)) & 0x1) << 5) | - ((ah >> 1) & 0x10) | - ((((ah >> 5) ^ (ah >> 2)) & 0x1) << 3) | - ((ah >> 2) & 0x4) | ((((ah >> 4) ^ (ah >> 1)) & 0x1) << 1) | (ah & 0x1); - alahxal = gf64_mul(ahxal, al); - deno = alahxal ^ ah2B; - inv = gf64_inv[deno]; - bl = gf64_mul(inv, ahxal); - bh = gf64_mul(inv, ah); - dout = ((bh & 0x3f) << 6) | (bl & 0x3f); - return (((bh & 0x3f) << 6) | (bl & 0x3f)); -} - -static unsigned short err_pos_lut[4096] = { - 0xfff, 0x000, 0x451, 0xfff, 0xfff, 0x3cf, 0xfff, 0x041, - 0xfff, 0xfff, 0xfff, 0xfff, 0x28a, 0xfff, 0x492, 0xfff, - 0x145, 0xfff, 0xfff, 0x514, 0xfff, 0x082, 0xfff, 0xfff, - 0xfff, 0x249, 0x38e, 0x410, 0xfff, 0x104, 0x208, 0x1c7, - 0xfff, 0xfff, 0xfff, 0xfff, 0x2cb, 0xfff, 0xfff, 0xfff, - 0x0c3, 0x34d, 0x4d3, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x186, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x30c, 0x555, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x166, 0xfff, 0xfff, 0xfff, 0xfff, - 0x385, 0x14e, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x4e1, - 0xfff, 0xfff, 0xfff, 0xfff, 0x538, 0xfff, 0x16d, 0xfff, - 0xfff, 0xfff, 0x45b, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x29c, 0x2cc, 0x30b, 0x2b3, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x0b3, 0xfff, 0x2f7, - 0xfff, 0x32b, 0xfff, 0xfff, 0xfff, 0xfff, 0x0a7, 0xfff, - 0xfff, 0x2da, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x07e, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x11c, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x22f, 0xfff, 0x1f4, 0xfff, 0xfff, - 0x2b0, 0x504, 0xfff, 0x114, 0xfff, 0xfff, 0xfff, 0x21d, - 0xfff, 0xfff, 0xfff, 0xfff, 0x00d, 0x3c4, 0x340, 0x10f, - 0xfff, 0xfff, 0x266, 0x02e, 0xfff, 0xfff, 0xfff, 0x4f8, - 0x337, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x07b, 0x168, 0xfff, 0xfff, 0x0fe, - 0xfff, 0xfff, 0x51a, 0xfff, 0x458, 0xfff, 0x36d, 0xfff, - 0xfff, 0xfff, 0xfff, 0x073, 0x37d, 0x415, 0x550, 0xfff, - 0xfff, 0xfff, 0x23b, 0x4b4, 0xfff, 0xfff, 0xfff, 0x1a1, - 0xfff, 0xfff, 0x3aa, 0xfff, 0x117, 0x04d, 0x341, 0xfff, - 0xfff, 0xfff, 0xfff, 0x518, 0x03e, 0x0f2, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x363, 0xfff, 0x0b9, 0xfff, 0xfff, - 0x241, 0xfff, 0xfff, 0x049, 0xfff, 0xfff, 0xfff, 0xfff, - 0x15f, 0x52d, 0xfff, 0xfff, 0xfff, 0x29e, 0xfff, 0xfff, - 0xfff, 0xfff, 0x4cf, 0x0fc, 0xfff, 0x36f, 0x3d3, 0xfff, - 0x228, 0xfff, 0xfff, 0x45e, 0xfff, 0xfff, 0xfff, 0xfff, - 0x238, 0xfff, 0xfff, 0xfff, 0xfff, 0x47f, 0xfff, 0xfff, - 0x43a, 0x265, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x3e8, - 0xfff, 0xfff, 0x01a, 0xfff, 0xfff, 0xfff, 0xfff, 0x21e, - 0x1fc, 0x40b, 0xfff, 0xfff, 0xfff, 0x2d0, 0x159, 0xfff, - 0xfff, 0x313, 0xfff, 0xfff, 0x05c, 0x4cc, 0xfff, 0xfff, - 0x0f6, 0x3d5, 0xfff, 0xfff, 0xfff, 0x54f, 0xfff, 0xfff, - 0xfff, 0x172, 0x1e4, 0x07c, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x53c, 0x1ad, 0x535, - 0x19b, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0x092, 0xfff, 0x2be, 0xfff, 0xfff, 0x482, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x0e6, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x476, 0xfff, 0x51d, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0x342, 0x2b5, 0x22e, 0x09a, 0xfff, 0x08d, - 0x44f, 0x3ed, 0xfff, 0xfff, 0xfff, 0xfff, 0x3d1, 0xfff, - 0xfff, 0x543, 0xfff, 0x48f, 0xfff, 0x3d2, 0xfff, 0x0d5, - 0x113, 0x0ec, 0x427, 0xfff, 0xfff, 0xfff, 0x4c4, 0xfff, - 0xfff, 0x50a, 0xfff, 0x144, 0xfff, 0x105, 0x39f, 0x294, - 0x164, 0xfff, 0x31a, 0xfff, 0xfff, 0x49a, 0xfff, 0x130, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0x1be, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0x49e, 0x371, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0x0e8, 0x49c, 0x0f4, 0xfff, - 0x338, 0x1a7, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x36c, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x1ae, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x31b, 0xfff, 0xfff, 0x2dd, 0x522, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x2f4, - 0x3c6, 0x30d, 0xfff, 0xfff, 0xfff, 0xfff, 0x34c, 0x18f, - 0x30a, 0xfff, 0x01f, 0x079, 0xfff, 0xfff, 0x54d, 0x46b, - 0x28c, 0x37f, 0xfff, 0xfff, 0xfff, 0xfff, 0x355, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x14f, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x359, 0x3fe, 0x3c5, 0xfff, 0xfff, - 0xfff, 0xfff, 0x423, 0xfff, 0xfff, 0x34a, 0x22c, 0xfff, - 0x25a, 0xfff, 0xfff, 0x4ad, 0xfff, 0x28d, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x547, 0xfff, 0xfff, 0xfff, 0xfff, - 0x2e2, 0xfff, 0xfff, 0x1d5, 0xfff, 0x2a8, 0xfff, 0xfff, - 0x03f, 0xfff, 0xfff, 0xfff, 0xfff, 0x3eb, 0x0fa, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x55b, 0xfff, - 0x08e, 0xfff, 0x3ae, 0xfff, 0x3a4, 0xfff, 0x282, 0x158, - 0xfff, 0x382, 0xfff, 0xfff, 0x499, 0xfff, 0xfff, 0x08a, - 0xfff, 0xfff, 0xfff, 0x456, 0x3be, 0xfff, 0x1e2, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0x559, 0xfff, 0x1a0, 0xfff, - 0xfff, 0x0b4, 0xfff, 0xfff, 0xfff, 0x2df, 0xfff, 0xfff, - 0xfff, 0x07f, 0x4f5, 0xfff, 0xfff, 0x27c, 0x133, 0x017, - 0xfff, 0x3fd, 0xfff, 0xfff, 0xfff, 0x44d, 0x4cd, 0x17a, - 0x0d7, 0x537, 0xfff, 0xfff, 0x353, 0xfff, 0xfff, 0x351, - 0x366, 0xfff, 0x44a, 0xfff, 0x1a6, 0xfff, 0xfff, 0xfff, - 0x291, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x1e3, - 0xfff, 0xfff, 0xfff, 0xfff, 0x389, 0xfff, 0x07a, 0xfff, - 0x1b6, 0x2ed, 0xfff, 0xfff, 0xfff, 0xfff, 0x24e, 0x074, - 0xfff, 0xfff, 0x3dc, 0xfff, 0x4e3, 0xfff, 0xfff, 0xfff, - 0xfff, 0x4eb, 0xfff, 0xfff, 0x3b8, 0x4de, 0xfff, 0x19c, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x262, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x076, 0x4e8, 0x3da, - 0xfff, 0x531, 0xfff, 0xfff, 0x14a, 0xfff, 0x0a2, 0x433, - 0x3df, 0x1e9, 0xfff, 0xfff, 0xfff, 0xfff, 0x3e7, 0x285, - 0x2d8, 0xfff, 0xfff, 0xfff, 0x349, 0x18d, 0x098, 0xfff, - 0x0df, 0x4bf, 0xfff, 0xfff, 0x0b2, 0xfff, 0x346, 0x24d, - 0xfff, 0xfff, 0xfff, 0x24f, 0x4fa, 0x2f9, 0xfff, 0xfff, - 0x3c9, 0xfff, 0x2b4, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x056, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x179, 0xfff, 0x0e9, 0x3f0, 0x33d, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x1fd, 0xfff, 0xfff, 0x526, 0xfff, - 0xfff, 0xfff, 0x53d, 0xfff, 0xfff, 0xfff, 0x170, 0x331, - 0xfff, 0x068, 0xfff, 0xfff, 0xfff, 0x3f7, 0xfff, 0x3d8, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x09f, 0x556, 0xfff, 0xfff, 0x02d, 0xfff, 0xfff, - 0x553, 0xfff, 0xfff, 0xfff, 0x1f0, 0xfff, 0xfff, 0x4d6, - 0x41e, 0xfff, 0xfff, 0xfff, 0xfff, 0x4d5, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x248, 0xfff, 0xfff, 0xfff, 0x0a3, - 0xfff, 0x217, 0xfff, 0xfff, 0xfff, 0x4f1, 0x209, 0xfff, - 0xfff, 0x475, 0x234, 0x52b, 0x398, 0xfff, 0x08b, 0xfff, - 0xfff, 0xfff, 0xfff, 0x2c2, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0x268, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x4a3, 0xfff, 0x0aa, 0xfff, 0x1d9, 0xfff, 0xfff, - 0xfff, 0xfff, 0x155, 0xfff, 0xfff, 0xfff, 0xfff, 0x0bf, - 0x539, 0xfff, 0xfff, 0x2f1, 0x545, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x2a7, 0x06f, 0xfff, 0x378, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x25e, 0xfff, - 0xfff, 0xfff, 0xfff, 0x15d, 0x02a, 0xfff, 0xfff, 0x0bc, - 0x235, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0x150, 0xfff, 0x1a9, 0xfff, 0xfff, 0xfff, 0xfff, 0x381, - 0xfff, 0x04e, 0x270, 0x13f, 0xfff, 0xfff, 0x405, 0xfff, - 0x3cd, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x2ef, 0xfff, 0x06a, 0xfff, 0xfff, 0xfff, 0x34f, - 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0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x100, 0x191, 0xfff, - 0x1ea, 0x29f, 0xfff, 0xfff, 0xfff, 0x276, 0xfff, 0xfff, - 0x2b1, 0x3b9, 0xfff, 0x03c, 0xfff, 0xfff, 0xfff, 0x180, - 0xfff, 0x08f, 0xfff, 0xfff, 0x19e, 0x019, 0xfff, 0x0b0, - 0x0fd, 0x332, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x06b, 0x2e8, 0xfff, 0x446, 0xfff, 0xfff, 0x004, - 0x247, 0x197, 0xfff, 0x112, 0x169, 0x292, 0xfff, 0x302, - 0xfff, 0xfff, 0x33b, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x287, 0x21f, 0xfff, 0x3ea, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x4e7, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x3a8, 0xfff, 0xfff, 0x2bc, 0xfff, - 0x484, 0x296, 0xfff, 0x1c9, 0x08c, 0x1e5, 0x48a, 0xfff, - 0x360, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0x1ca, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x10d, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0x066, 0x2ea, 0x28b, 0x25b, 0xfff, 0x072, - 0xfff, 0xfff, 0xfff, 0xfff, 0x2b6, 0xfff, 0xfff, 0x272, - 0xfff, 0xfff, 0x525, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0x2ca, 0xfff, 0xfff, 0xfff, 0x299, 0xfff, 0xfff, 0xfff, - 0x558, 0x41a, 0xfff, 0x4f7, 0x557, 0xfff, 0x4a0, 0x344, - 0x12c, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x125, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0x40e, 0xfff, 0xfff, 0x502, 0xfff, 0x103, 0x3e6, 0xfff, - 0x527, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x45d, 0xfff, 0xfff, 0xfff, 0xfff, - 0x44e, 0xfff, 0xfff, 0xfff, 0xfff, 0x0d2, 0x4c9, 0x35e, - 0x459, 0x2d9, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x17d, - 0x0c4, 0xfff, 0xfff, 0xfff, 0x3ac, 0x390, 0x094, 0xfff, - 0x483, 0x0ab, 0xfff, 0x253, 0xfff, 0x391, 0xfff, 0xfff, - 0xfff, 0xfff, 0x123, 0x0ef, 0xfff, 0xfff, 0xfff, 0x330, - 0x38c, 0xfff, 0xfff, 0x2ae, 0xfff, 0xfff, 0xfff, 0x042, - 0x012, 0x06d, 0xfff, 0xfff, 0xfff, 0x32a, 0x3db, 0x364, - 0x2dc, 0xfff, 0x30f, 0x3d7, 0x4a5, 0x050, 0xfff, 0xfff, - 0x029, 0xfff, 0xfff, 0xfff, 0xfff, 0x1d1, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x480, 0xfff, - 0x4ed, 0x081, 0x0a1, 0xfff, 0xfff, 0xfff, 0x30e, 0x52f, - 0x257, 0xfff, 0xfff, 0x447, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x401, 0x3cc, 0xfff, 0xfff, 0x0fb, - 0x2c9, 0x42a, 0x314, 0x33e, 0x3bd, 0x318, 0xfff, 0x10e, - 0x2a1, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x24c, - 0x506, 0xfff, 0x267, 0xfff, 0xfff, 0x219, 0xfff, 0x1eb, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0x309, 0x3e2, 0x46c, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0x384, 0xfff, 0xfff, 0xfff, 0xfff, 0x50c, 0xfff, 0x24b, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x038, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x194, - 0x143, 0x3e3, 0xfff, 0xfff, 0xfff, 0x4c2, 0xfff, 0xfff, - 0x0e1, 0x25c, 0xfff, 0x237, 0xfff, 0x1fe, 0xfff, 0xfff, - 0xfff, 0x065, 0x2a4, 0xfff, 0x386, 0x55a, 0x11b, 0xfff, - 0xfff, 0x192, 0xfff, 0x183, 0x00e, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x4b2, 0x18e, 0xfff, 0xfff, 0xfff, - 0xfff, 0x486, 0x4ef, 0x0c6, 0x380, 0xfff, 0x4a8, 0xfff, - 0x0c5, 0xfff, 0xfff, 0xfff, 0xfff, 0x093, 0x1b8, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x2e6, - 0xfff, 0x0f3, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0x28e, 0xfff, 0x53b, 0x420, 0x22a, 0x33a, 0xfff, 0x387, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x2a3, 0xfff, 0xfff, - 0xfff, 0x428, 0x500, 0xfff, 0xfff, 0x120, 0x2c6, 0x290, - 0x2f5, 0x0e3, 0xfff, 0x0b7, 0xfff, 0x319, 0x474, 0xfff, - 0xfff, 0xfff, 0x529, 0x014, 0xfff, 0x41b, 0x40a, 0x18b, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x0d9, - 0xfff, 0x38a, 0xfff, 0xfff, 0xfff, 0xfff, 0x1ce, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0x3b1, 0xfff, 0xfff, 0x05d, - 0x2c4, 0xfff, 0xfff, 0x4af, 0xfff, 0x030, 0xfff, 0xfff, - 0x203, 0xfff, 0x277, 0x256, 0xfff, 0xfff, 0xfff, 0x4f9, - 0xfff, 0x2c7, 0xfff, 0x466, 0x016, 0x1cd, 0xfff, 0x167, - 0xfff, 0xfff, 0x0c8, 0xfff, 0x43d, 0xfff, 0xfff, 0x020, - 0xfff, 0xfff, 0x232, 0x1cb, 0x1e0, 0xfff, 0xfff, 0x347, - 0xfff, 0x478, 0xfff, 0x365, 0xfff, 0xfff, 0xfff, 0xfff, - 0x358, 0xfff, 0x10b, 0xfff, 0x35d, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0x452, 0x22d, 0xfff, 0xfff, 0x47d, 0xfff, - 0x2f3, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x460, 0xfff, - 0xfff, 0xfff, 0x50b, 0xfff, 0xfff, 0xfff, 0x2ec, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0x4b1, 0x422, 0xfff, 0xfff, - 0xfff, 0x2d4, 0xfff, 0x239, 0xfff, 0xfff, 0xfff, 0x439, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x491, 0x075, 0xfff, 0xfff, 0xfff, 0x06c, 0xfff, - 0xfff, 0x0f9, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x139, 0xfff, 0x4f6, 0xfff, 0xfff, 0x409, 0xfff, - 0xfff, 0x15b, 0xfff, 0xfff, 0x348, 0xfff, 0xfff, 0xfff, - 0xfff, 0x4a2, 0x49d, 0xfff, 0x033, 0x175, 0xfff, 0x039, - 0xfff, 0x312, 0x40c, 0xfff, 0xfff, 0x325, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0x4aa, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0x165, 0x3bc, 0x48c, 0x310, 0x096, - 0xfff, 0xfff, 0x250, 0x1a2, 0xfff, 0xfff, 0xfff, 0xfff, - 0x20d, 0x2ac, 0xfff, 0xfff, 0x39b, 0xfff, 0x377, 0xfff, - 0x512, 0x495, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0x357, 0x4ea, 0xfff, 0xfff, - 0xfff, 0xfff, 0x198, 0xfff, 0xfff, 0xfff, 0x434, 0x04a, - 0xfff, 0xfff, 0xfff, 0xfff, 0x062, 0xfff, 0x1d6, 0x1c8, - 0xfff, 0x1f3, 0x281, 0xfff, 0x462, 0xfff, 0xfff, 0xfff, - 0x4b0, 0xfff, 0x207, 0xfff, 0xfff, 0xfff, 0xfff, 0x3dd, - 0xfff, 0xfff, 0x55d, 0xfff, 0x552, 0x494, 0x1af, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0x227, 0xfff, 0xfff, 0x069, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x43e, - 0x0b5, 0xfff, 0x524, 0x2d2, 0xfff, 0xfff, 0xfff, 0x28f, - 0xfff, 0x01b, 0x50e, 0xfff, 0xfff, 0x1bb, 0xfff, 0xfff, - 0x41d, 0xfff, 0x32e, 0x48e, 0xfff, 0x1f7, 0x224, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0x394, 0xfff, 0xfff, 0xfff, - 0xfff, 0x52c, 0xfff, 0xfff, 0xfff, 0x392, 0xfff, 0x1e7, - 0xfff, 0xfff, 0x3f9, 0x3a7, 0xfff, 0x51f, 0xfff, 0x0bb, - 0x118, 0x3ca, 0xfff, 0x1dd, 0xfff, 0x48b, 0xfff, 0xfff, - 0xfff, 0xfff, 0x50f, 0xfff, 0x0d6, 0xfff, 0x1fa, 0xfff, - 0x11e, 0xfff, 0xfff, 0xfff, 0xfff, 0x4d7, 0xfff, 0x078, - 0x008, 0xfff, 0x25d, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0x032, 0x33c, 0xfff, 0x4d9, 0x160, 0xfff, 0xfff, 0x300, - 0x0b1, 0xfff, 0x322, 0xfff, 0x4ec, 0xfff, 0xfff, 0x200, - 0x00c, 0x369, 0x473, 0xfff, 0xfff, 0x32c, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0x53e, 0x3d4, 0x417, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0x34b, 0x001, 0x39a, 0x02c, 0xfff, 0xfff, 0x2ce, 0x00f, - 0xfff, 0x0ba, 0xfff, 0xfff, 0xfff, 0xfff, 0x060, 0xfff, - 0x406, 0xfff, 0xfff, 0xfff, 0x4ee, 0x4ac, 0xfff, 0x43f, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x29b, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x216, - 0x190, 0xfff, 0x396, 0x464, 0xfff, 0xfff, 0x323, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x2e9, 0xfff, 0x26d, - 0x2cd, 0x040, 0xfff, 0xfff, 0xfff, 0xfff, 0x38b, 0x3c0, - 0xfff, 0xfff, 0xfff, 0x1f2, 0xfff, 0x0ea, 0xfff, 0xfff, - 0x472, 0xfff, 0x1fb, 0xfff, 0xfff, 0x0af, 0x27f, 0xfff, - 0xfff, 0xfff, 0x479, 0x023, 0xfff, 0x0d8, 0x3b3, 0xfff, - 0xfff, 0xfff, 0x121, 0xfff, 0xfff, 0x3bf, 0xfff, 0xfff, - 0x16b, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0x45a, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0x0be, 0xfff, 0xfff, 0xfff, 0x111, 0xfff, 0x220, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0x09b, 0x218, 0xfff, 0x022, 0x202, 0xfff, - 0x4c8, 0xfff, 0x0ed, 0xfff, 0xfff, 0x182, 0xfff, 0xfff, - 0xfff, 0x17f, 0x213, 0xfff, 0x321, 0x36a, 0xfff, 0x086, - 0xfff, 0xfff, 0xfff, 0x43b, 0x088, 0xfff, 0xfff, 0xfff, - 0xfff, 0x26c, 0xfff, 0x2f8, 0x3b4, 0xfff, 0xfff, 0xfff, - 0x132, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x333, 0x444, - 0x0c1, 0x4d8, 0x46d, 0x264, 0xfff, 0xfff, 0xfff, 0xfff, - 0x426, 0xfff, 0xfff, 0xfff, 0xfff, 0x2fe, 0xfff, 0xfff, - 0xfff, 0xfff, 0x011, 0xfff, 0x05f, 0xfff, 0xfff, 0xfff, - 0xfff, 0x10c, 0x101, 0xfff, 0xfff, 0xfff, 0xfff, 0x110, - 0xfff, 0x044, 0x304, 0x361, 0x404, 0xfff, 0x51b, 0x099, - 0xfff, 0x440, 0xfff, 0xfff, 0xfff, 0x222, 0xfff, 0xfff, - 0xfff, 0xfff, 0x1b5, 0xfff, 0x136, 0x430, 0xfff, 0x1da, - 0xfff, 0xfff, 0xfff, 0x043, 0xfff, 0x17c, 0xfff, 0xfff, - 0xfff, 0x01c, 0xfff, 0xfff, 0xfff, 0x425, 0x236, 0xfff, - 0x317, 0xfff, 0xfff, 0x437, 0x3fc, 0xfff, 0x1f1, 0xfff, - 0x324, 0xfff, 0xfff, 0x0ca, 0x306, 0xfff, 0x548, 0xfff, - 0x46e, 0xfff, 0xfff, 0xfff, 0x4b8, 0x1c2, 0x286, 0xfff, - 0xfff, 0x087, 0x18a, 0x19f, 0xfff, 0xfff, 0xfff, 0xfff, - 0x18c, 0xfff, 0x215, 0xfff, 0xfff, 0xfff, 0xfff, 0x283, - 0xfff, 0xfff, 0xfff, 0x126, 0xfff, 0xfff, 0x370, 0xfff, - 0x53f, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0x31c, 0xfff, - 0x4d1, 0xfff, 0xfff, 0xfff, 0x021, 0xfff, 0x157, 0xfff, - 0xfff, 0x028, 0x16e, 0xfff, 0x421, 0xfff, 0x1c6, 0xfff, - 0xfff, 0x511, 0xfff, 0xfff, 0x39c, 0x46f, 0x1b2, 0xfff, - 0xfff, 0x316, 0xfff, 0xfff, 0x009, 0xfff, 0xfff, 0x195, - 0xfff, 0x240, 0x546, 0xfff, 0xfff, 0x520, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0x454, 0xfff, 0xfff, 0xfff, - 0x3f3, 0xfff, 0xfff, 0x187, 0xfff, 0x4a9, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0x51c, 0x453, 0x1e6, 0xfff, - 0xfff, 0xfff, 0x1b0, 0xfff, 0x477, 0xfff, 0xfff, 0xfff, - 0x4fe, 0xfff, 0x32f, 0xfff, 0xfff, 0x15e, 0x1d4, 0xfff, - 0x0e5, 0xfff, 0xfff, 0xfff, 0x242, 0x14b, 0x046, 0xfff, - 0x3f6, 0x3bb, 0x3e4, 0xfff, 0xfff, 0x2e3, 0xfff, 0x245, - 0xfff, 0x149, 0xfff, 0xfff, 0xfff, 0x2db, 0xfff, 0xfff, - 0x181, 0xfff, 0x089, 0x2c5, 0xfff, 0x1f5, 0xfff, 0x2d6, - 0x507, 0xfff, 0x42d, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0x080, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, 0xfff, - 0xfff, 0xfff, 0xfff, 0xfff, 0x3c3, 0x320, 0xfff, 0x1e1, - 0xfff, 0x0f5, 0x13b, 0xfff, 0xfff, 0xfff, 0x003, 0x4da, - 0xfff, 0xfff, 0xfff, 0x42c, 0xfff, 0xfff, 0x0cb, 0xfff, - 0x536, 0x2c3, 0xfff, 0xfff, 0xfff, 0xfff, 0x199, 0xfff, - 0xfff, 0x0c0, 0xfff, 0x01e, 0x497, 0xfff, 0xfff, 0x3e5, - 0xfff, 0xfff, 0xfff, 0x0cf, 0xfff, 0x2bd, 0xfff, 0x223, - 0xfff, 0x3ff, 0xfff, 0x058, 0x174, 0x3ef, 0xfff, 0x002 -}; - -static unsigned short err_pos(unsigned short din) -{ - BUG_ON(din >= ARRAY_SIZE(err_pos_lut)); - return err_pos_lut[din]; -} -static int chk_no_err_only(unsigned short *chk_syndrome_list, unsigned short *err_info) -{ - if ((chk_syndrome_list[0] | chk_syndrome_list[1] | - chk_syndrome_list[2] | chk_syndrome_list[3] | - chk_syndrome_list[4] | chk_syndrome_list[5] | - chk_syndrome_list[6] | chk_syndrome_list[7]) != 0x0) { - return -EINVAL; - } else { - err_info[0] = 0x0; - return 0; - } -} -static int chk_1_err_only(unsigned short *chk_syndrome_list, unsigned short *err_info) -{ - unsigned short tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6; - tmp0 = gf4096_mul(chk_syndrome_list[1], gf4096_inv(chk_syndrome_list[0])); - tmp1 = gf4096_mul(chk_syndrome_list[2], gf4096_inv(chk_syndrome_list[1])); - tmp2 = gf4096_mul(chk_syndrome_list[3], gf4096_inv(chk_syndrome_list[2])); - tmp3 = gf4096_mul(chk_syndrome_list[4], gf4096_inv(chk_syndrome_list[3])); - tmp4 = gf4096_mul(chk_syndrome_list[5], gf4096_inv(chk_syndrome_list[4])); - tmp5 = gf4096_mul(chk_syndrome_list[6], gf4096_inv(chk_syndrome_list[5])); - tmp6 = gf4096_mul(chk_syndrome_list[7], gf4096_inv(chk_syndrome_list[6])); - if ((tmp0 == tmp1) & (tmp1 == tmp2) & (tmp2 == tmp3) & (tmp3 == tmp4) & (tmp4 == tmp5) & (tmp5 == tmp6)) { - err_info[0] = 0x1; // encode 1-symbol error as 0x1 - err_info[1] = err_pos(tmp0); - err_info[1] = (unsigned short)(0x55e - err_info[1]); - err_info[5] = chk_syndrome_list[0]; - return 0; - } else - return -EINVAL; -} -static int chk_2_err_only(unsigned short *chk_syndrome_list, unsigned short *err_info) -{ - unsigned short tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; - unsigned short coefs[4]; - unsigned short err_pats[4]; - int found_num_root = 0; - unsigned short bit2_root0, bit2_root1; - unsigned short bit2_root0_inv, bit2_root1_inv; - unsigned short err_loc_eqn, test_root; - unsigned short bit2_loc0, bit2_loc1; - unsigned short bit2_pat0, bit2_pat1; - - find_2x2_soln(chk_syndrome_list[1], - chk_syndrome_list[0], - chk_syndrome_list[2], chk_syndrome_list[1], chk_syndrome_list[2], chk_syndrome_list[3], coefs); - for (test_root = 0x1; test_root < 0xfff; test_root++) { - err_loc_eqn = - gf4096_mul(coefs[1], gf4096_mul(test_root, test_root)) ^ gf4096_mul(coefs[0], test_root) ^ 0x1; - if (err_loc_eqn == 0x0) { - if (found_num_root == 0) { - bit2_root0 = test_root; - found_num_root = 1; - } else if (found_num_root == 1) { - bit2_root1 = test_root; - found_num_root = 2; - break; - } - } - } - if (found_num_root != 2) - return -EINVAL; - else { - bit2_root0_inv = gf4096_inv(bit2_root0); - bit2_root1_inv = gf4096_inv(bit2_root1); - find_2bit_err_pats(chk_syndrome_list[0], - chk_syndrome_list[1], bit2_root0_inv, bit2_root1_inv, err_pats); - bit2_pat0 = err_pats[0]; - bit2_pat1 = err_pats[1]; - //for(x+1) - tmp0 = gf4096_mul(gf4096_mul(bit2_root0_inv, bit2_root0_inv), gf4096_mul(bit2_root0_inv, bit2_root0_inv)); //rinv0^4 - tmp1 = gf4096_mul(bit2_root0_inv, tmp0); //rinv0^5 - tmp2 = gf4096_mul(bit2_root0_inv, tmp1); //rinv0^6 - tmp3 = gf4096_mul(bit2_root0_inv, tmp2); //rinv0^7 - tmp4 = gf4096_mul(gf4096_mul(bit2_root1_inv, bit2_root1_inv), gf4096_mul(bit2_root1_inv, bit2_root1_inv)); //rinv1^4 - tmp5 = gf4096_mul(bit2_root1_inv, tmp4); //rinv1^5 - tmp6 = gf4096_mul(bit2_root1_inv, tmp5); //rinv1^6 - tmp7 = gf4096_mul(bit2_root1_inv, tmp6); //rinv1^7 - //check if only 2-bit error - if ((chk_syndrome_list[4] == - (gf4096_mul(bit2_pat0, tmp0) ^ - gf4096_mul(bit2_pat1, - tmp4))) & (chk_syndrome_list[5] == - (gf4096_mul(bit2_pat0, tmp1) ^ - gf4096_mul(bit2_pat1, - tmp5))) & - (chk_syndrome_list[6] == - (gf4096_mul(bit2_pat0, tmp2) ^ - gf4096_mul(bit2_pat1, - tmp6))) & (chk_syndrome_list[7] == - (gf4096_mul(bit2_pat0, tmp3) ^ gf4096_mul(bit2_pat1, tmp7)))) { - if ((err_pos(bit2_root0_inv) == 0xfff) | (err_pos(bit2_root1_inv) == 0xfff)) { - return -EINVAL; - } else { - bit2_loc0 = 0x55e - err_pos(bit2_root0_inv); - bit2_loc1 = 0x55e - err_pos(bit2_root1_inv); - err_info[0] = 0x2; // encode 2-symbol error as 0x2 - err_info[1] = bit2_loc0; - err_info[2] = bit2_loc1; - err_info[5] = bit2_pat0; - err_info[6] = bit2_pat1; - return 0; - } - } else - return -EINVAL; - } -} -static int chk_3_err_only(unsigned short *chk_syndrome_list, unsigned short *err_info) -{ - unsigned short tmp0, tmp1, tmp2, tmp3, tmp4, tmp5; - unsigned short coefs[4]; - unsigned short err_pats[4]; - int found_num_root = 0; - unsigned short bit3_root0, bit3_root1, bit3_root2; - unsigned short bit3_root0_inv, bit3_root1_inv, bit3_root2_inv; - unsigned short err_loc_eqn, test_root; - - find_3bit_err_coefs(chk_syndrome_list[0], chk_syndrome_list[1], - chk_syndrome_list[2], chk_syndrome_list[3], - chk_syndrome_list[4], chk_syndrome_list[5], coefs); - - for (test_root = 0x1; test_root < 0xfff; test_root++) { - err_loc_eqn = gf4096_mul(coefs[2], - gf4096_mul(gf4096_mul(test_root, test_root), - test_root)) ^ gf4096_mul(coefs[1], gf4096_mul(test_root, test_root)) - ^ gf4096_mul(coefs[0], test_root) ^ 0x1; - - if (err_loc_eqn == 0x0) { - if (found_num_root == 0) { - bit3_root0 = test_root; - found_num_root = 1; - } else if (found_num_root == 1) { - bit3_root1 = test_root; - found_num_root = 2; - } else if (found_num_root == 2) { - bit3_root2 = test_root; - found_num_root = 3; - break; - } - } - } - if (found_num_root != 3) - return -EINVAL; - else { - bit3_root0_inv = gf4096_inv(bit3_root0); - bit3_root1_inv = gf4096_inv(bit3_root1); - bit3_root2_inv = gf4096_inv(bit3_root2); - - find_3bit_err_pats(chk_syndrome_list[0], chk_syndrome_list[1], - chk_syndrome_list[2], bit3_root0_inv, - bit3_root1_inv, bit3_root2_inv, err_pats); - - //check if only 3-bit error - tmp0 = gf4096_mul(bit3_root0_inv, bit3_root0_inv); - tmp0 = gf4096_mul(tmp0, tmp0); - tmp0 = gf4096_mul(tmp0, bit3_root0_inv); - tmp0 = gf4096_mul(tmp0, bit3_root0_inv); //rinv0^6 - tmp1 = gf4096_mul(tmp0, bit3_root0_inv); //rinv0^7 - tmp2 = gf4096_mul(bit3_root1_inv, bit3_root1_inv); - tmp2 = gf4096_mul(tmp2, tmp2); - tmp2 = gf4096_mul(tmp2, bit3_root1_inv); - tmp2 = gf4096_mul(tmp2, bit3_root1_inv); //rinv1^6 - tmp3 = gf4096_mul(tmp2, bit3_root1_inv); //rinv1^7 - tmp4 = gf4096_mul(bit3_root2_inv, bit3_root2_inv); - tmp4 = gf4096_mul(tmp4, tmp4); - tmp4 = gf4096_mul(tmp4, bit3_root2_inv); - tmp4 = gf4096_mul(tmp4, bit3_root2_inv); //rinv2^6 - tmp5 = gf4096_mul(tmp4, bit3_root2_inv); //rinv2^7 - - //check if only 3 errors - if ((chk_syndrome_list[6] == (gf4096_mul(err_pats[0], tmp0) ^ - gf4096_mul(err_pats[1], tmp2) ^ - gf4096_mul(err_pats[2], tmp4))) & - (chk_syndrome_list[7] == (gf4096_mul(err_pats[0], tmp1) ^ - gf4096_mul(err_pats[1], tmp3) ^ gf4096_mul(err_pats[2], tmp5)))) { - if ((err_pos(bit3_root0_inv) == 0xfff) | - (err_pos(bit3_root1_inv) == 0xfff) | (err_pos(bit3_root2_inv) == 0xfff)) { - return -EINVAL; - } else { - err_info[0] = 0x3; - err_info[1] = (0x55e - err_pos(bit3_root0_inv)); - err_info[2] = (0x55e - err_pos(bit3_root1_inv)); - err_info[3] = (0x55e - err_pos(bit3_root2_inv)); - err_info[5] = err_pats[0]; - err_info[6] = err_pats[1]; - err_info[7] = err_pats[2]; - return 0; - } - } else - return -EINVAL; - } -} -static int chk_4_err_only(unsigned short *chk_syndrome_list, unsigned short *err_info) -{ - unsigned short coefs[4]; - unsigned short err_pats[4]; - int found_num_root = 0; - unsigned short bit4_root0, bit4_root1, bit4_root2, bit4_root3; - unsigned short bit4_root0_inv, bit4_root1_inv, bit4_root2_inv, bit4_root3_inv; - unsigned short err_loc_eqn, test_root; - - find_4bit_err_coefs(chk_syndrome_list[0], - chk_syndrome_list[1], - chk_syndrome_list[2], - chk_syndrome_list[3], - chk_syndrome_list[4], - chk_syndrome_list[5], chk_syndrome_list[6], chk_syndrome_list[7], coefs); - - for (test_root = 0x1; test_root < 0xfff; test_root++) { - err_loc_eqn = - gf4096_mul(coefs[3], - gf4096_mul(gf4096_mul - (gf4096_mul(test_root, test_root), - test_root), - test_root)) ^ gf4096_mul(coefs[2], - gf4096_mul - (gf4096_mul(test_root, test_root), test_root)) - ^ gf4096_mul(coefs[1], gf4096_mul(test_root, test_root)) ^ gf4096_mul(coefs[0], test_root) - ^ 0x1; - if (err_loc_eqn == 0x0) { - if (found_num_root == 0) { - bit4_root0 = test_root; - found_num_root = 1; - } else if (found_num_root == 1) { - bit4_root1 = test_root; - found_num_root = 2; - } else if (found_num_root == 2) { - bit4_root2 = test_root; - found_num_root = 3; - } else { - found_num_root = 4; - bit4_root3 = test_root; - break; - } - } - } - if (found_num_root != 4) { - return -EINVAL; - } else { - bit4_root0_inv = gf4096_inv(bit4_root0); - bit4_root1_inv = gf4096_inv(bit4_root1); - bit4_root2_inv = gf4096_inv(bit4_root2); - bit4_root3_inv = gf4096_inv(bit4_root3); - find_4bit_err_pats(chk_syndrome_list[0], - chk_syndrome_list[1], - chk_syndrome_list[2], - chk_syndrome_list[3], - bit4_root0_inv, bit4_root1_inv, bit4_root2_inv, bit4_root3_inv, err_pats); - err_info[0] = 0x4; - err_info[1] = (0x55e - err_pos(bit4_root0_inv)); - err_info[2] = (0x55e - err_pos(bit4_root1_inv)); - err_info[3] = (0x55e - err_pos(bit4_root2_inv)); - err_info[4] = (0x55e - err_pos(bit4_root3_inv)); - err_info[5] = err_pats[0]; - err_info[6] = err_pats[1]; - err_info[7] = err_pats[2]; - err_info[8] = err_pats[3]; - return 0; - } -} - -void correct_12bit_symbol(unsigned char *buf, unsigned short sym, - unsigned short val) -{ - if (unlikely(sym > 1366)) { - printk(KERN_ERR "Error: symbol %d out of range; cannot correct\n", sym); - } else if (sym == 0) { - buf[0] ^= val; - } else if (sym & 1) { - buf[1+(3*(sym-1))/2] ^= (val >> 4); - buf[2+(3*(sym-1))/2] ^= ((val & 0xf) << 4); - } else { - buf[2+(3*(sym-2))/2] ^= (val >> 8); - buf[3+(3*(sym-2))/2] ^= (val & 0xff); - } -} - -static int debugecc = 0; -module_param(debugecc, int, 0644); - -int cafe_correct_ecc(unsigned char *buf, - unsigned short *chk_syndrome_list) -{ - unsigned short err_info[9]; - int i; - - if (debugecc) { - printk(KERN_WARNING "cafe_correct_ecc invoked. Syndromes %x %x %x %x %x %x %x %x\n", - chk_syndrome_list[0], chk_syndrome_list[1], - chk_syndrome_list[2], chk_syndrome_list[3], - chk_syndrome_list[4], chk_syndrome_list[5], - chk_syndrome_list[6], chk_syndrome_list[7]); - for (i=0; i < 2048; i+=16) { - printk(KERN_WARNING "D %04x: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", - i, - buf[i], buf[i+1], buf[i+2], buf[i+3], - buf[i+4], buf[i+5], buf[i+6], buf[i+7], - buf[i+8], buf[i+9], buf[i+10], buf[i+11], - buf[i+12], buf[i+13], buf[i+14], buf[i+15]); - } - for ( ; i < 2112; i+=16) { - printk(KERN_WARNING "O %02x: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", - i - 2048, - buf[i], buf[i+1], buf[i+2], buf[i+3], - buf[i+4], buf[i+5], buf[i+6], buf[i+7], - buf[i+8], buf[i+9], buf[i+10], buf[i+11], - buf[i+12], buf[i+13], buf[i+14], buf[i+15]); - } - } - - - - if (chk_no_err_only(chk_syndrome_list, err_info) && - chk_1_err_only(chk_syndrome_list, err_info) && - chk_2_err_only(chk_syndrome_list, err_info) && - chk_3_err_only(chk_syndrome_list, err_info) && - chk_4_err_only(chk_syndrome_list, err_info)) { - return -EIO; - } - - for (i=0; i < err_info[0]; i++) { - if (debugecc) - printk(KERN_WARNING "Correct symbol %d with 0x%03x\n", - err_info[1+i], err_info[5+i]); - - correct_12bit_symbol(buf, err_info[1+i], err_info[5+i]); - } - - return err_info[0]; -} - |