Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Generic Reed Solomon encoder / decoder library
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright 2002, Phil Karn, KA9Q
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * May be used under the terms of the GNU General Public License (GPL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * Adaption to the kernel by Thomas Gleixner (tglx@linutronix.de)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * Generic data width independent code which is included by the wrappers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 	struct rs_codec *rs = rsc->codec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 	int i, j, pad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	int nn = rs->nn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	int nroots = rs->nroots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	uint16_t *alpha_to = rs->alpha_to;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	uint16_t *index_of = rs->index_of;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	uint16_t *genpoly = rs->genpoly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	uint16_t fb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	uint16_t msk = (uint16_t) rs->nn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	/* Check length parameter for validity */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	pad = nn - nroots - len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	if (pad < 0 || pad >= nn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		return -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	for (i = 0; i < len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		fb = index_of[((((uint16_t) data[i])^invmsk) & msk) ^ par[0]];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		/* feedback term is non-zero */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		if (fb != nn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 			for (j = 1; j < nroots; j++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 				par[j] ^= alpha_to[rs_modnn(rs, fb +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 							 genpoly[nroots - j])];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		/* Shift */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		memmove(&par[0], &par[1], sizeof(uint16_t) * (nroots - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		if (fb != nn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 			par[nroots - 1] = alpha_to[rs_modnn(rs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 							    fb + genpoly[0])];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 			par[nroots - 1] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }