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| 2 | |
| 3 | * This host program runs at kernel build time and generates the lookup tables
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| 4 | * used by the generic CRC64 code.
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| 5 | *
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| 6 | * Copyright 2018 SUSE Linux.
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| 7 | * Author: Coly Li <[email protected]>
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| 8 |
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| 9 | #include <inttypes.h>
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| 10 | #include <stdio.h>
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| 11 |
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| 12 | #define CRC64_ECMA182_POLY 0x42F0E1EBA9EA3693ULL
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| 13 | #define CRC64_NVME_POLY 0x9A6C9329AC4BC9B5ULL
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| 14 |
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| 15 | static uint64_t crc64_table[256] = {0};
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| 16 | static uint64_t crc64_nvme_table[256] = {0};
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| 17 |
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| 18 | static void generate_reflected_crc64_table(uint64_t table[256], uint64_t poly)
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| 19 | {
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| 20 | uint64_t i, j, c, crc;
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| 21 |
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| 22 | for (i = 0; i < 256; i++) {
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| 23 | crc = 0ULL;
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| 24 | c = i;
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| 25 |
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| 26 | for (j = 0; j < 8; j++) {
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| 27 | if ((crc ^ (c >> j)) & 1)
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| 28 | crc = (crc >> 1) ^ poly;
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| 29 | else
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| 30 | crc >>= 1;
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| 31 | }
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| 32 | table[i] = crc;
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| 33 | }
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| 34 | }
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| 35 |
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| 36 | static void generate_crc64_table(uint64_t table[256], uint64_t poly)
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| 37 | {
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| 38 | uint64_t i, j, c, crc;
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| 39 |
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| 40 | for (i = 0; i < 256; i++) {
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| 41 | crc = 0;
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| 42 | c = i << 56;
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| 43 |
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| 44 | for (j = 0; j < 8; j++) {
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| 45 | if ((crc ^ c) & 0x8000000000000000ULL)
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| 46 | crc = (crc << 1) ^ poly;
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| 47 | else
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| 48 | crc <<= 1;
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| 49 | c <<= 1;
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| 50 | }
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| 51 |
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| 52 | table[i] = crc;
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| 53 | }
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| 54 | }
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| 55 |
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| 56 | static void output_table(uint64_t table[256])
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| 57 | {
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| 58 | int i;
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| 59 |
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| 60 | for (i = 0; i < 256; i++) {
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| 61 | printf("\t0x%016" PRIx64 "ULL", table[i]);
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| 62 | if (i & 0x1)
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| 63 | printf(",\n");
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| 64 | else
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| 65 | printf(", ");
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| 66 | }
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| 67 | printf("};\n");
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| 68 | }
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| 69 |
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| 70 | static void print_crc64_tables(void)
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| 71 | {
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| 72 | printf("/* this file is generated - do not edit */\n\n");
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| 73 | printf("#include <linux/types.h>\n");
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| 74 | printf("#include <linux/cache.h>\n\n");
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| 75 | printf("static const u64 ____cacheline_aligned crc64table[256] = {\n");
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| 76 | output_table(crc64_table);
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| 77 |
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| 78 | printf("\nstatic const u64 ____cacheline_aligned crc64nvmetable[256] = {\n");
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| 79 | output_table(crc64_nvme_table);
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| 80 | }
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| 81 |
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| 82 | int main(int argc, char *argv[])
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| 83 | {
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| 84 | generate_crc64_table(crc64_table, CRC64_ECMA182_POLY);
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| 85 | generate_reflected_crc64_table(crc64_nvme_table, CRC64_NVME_POLY);
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| 86 | print_crc64_tables();
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| 87 | return 0;
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| 88 | }
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