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)  * Generate lookup table for the table-driven CRC64 calculation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * gen_crc64table is executed in kernel build time and generates
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * lib/crc64table.h. This header is included by lib/crc64.c for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * the table-driven CRC64 calculation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * See lib/crc64.c for more information about which specification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * and polynomial arithmetic that gen_crc64table.c follows to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * generate the lookup table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * Copyright 2018 SUSE Linux.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  *   Author: Coly Li <colyli@suse.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <inttypes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define CRC64_ECMA182_POLY 0x42F0E1EBA9EA3693ULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static uint64_t crc64_table[256] = {0};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static void generate_crc64_table(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	uint64_t i, j, c, crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	for (i = 0; i < 256; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		crc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		c = i << 56;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		for (j = 0; j < 8; j++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 			if ((crc ^ c) & 0x8000000000000000ULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 				crc = (crc << 1) ^ CRC64_ECMA182_POLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 			else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 				crc <<= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 			c <<= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		crc64_table[i] = crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static void print_crc64_table(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	printf("/* this file is generated - do not edit */\n\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	printf("#include <linux/types.h>\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	printf("#include <linux/cache.h>\n\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	printf("static const u64 ____cacheline_aligned crc64table[256] = {\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	for (i = 0; i < 256; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		printf("\t0x%016" PRIx64 "ULL", crc64_table[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		if (i & 0x1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 			printf(",\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 			printf(", ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	printf("};\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) int main(int argc, char *argv[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	generate_crc64_table();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	print_crc64_table();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }