https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: b3a9e3b9622ae10064826dccb4f7a52bd88c7407 authored by Linus Torvalds on 14 June 2020, 19:45:04 UTC
Linux 5.8-rc1
Linux 5.8-rc1
Tip revision: b3a9e3b
gen_crc64table.c
// SPDX-License-Identifier: GPL-2.0
/*
* Generate lookup table for the table-driven CRC64 calculation.
*
* gen_crc64table is executed in kernel build time and generates
* lib/crc64table.h. This header is included by lib/crc64.c for
* the table-driven CRC64 calculation.
*
* See lib/crc64.c for more information about which specification
* and polynomial arithmetic that gen_crc64table.c follows to
* generate the lookup table.
*
* Copyright 2018 SUSE Linux.
* Author: Coly Li <colyli@suse.de>
*/
#include <inttypes.h>
#include <stdio.h>
#define CRC64_ECMA182_POLY 0x42F0E1EBA9EA3693ULL
static uint64_t crc64_table[256] = {0};
static void generate_crc64_table(void)
{
uint64_t i, j, c, crc;
for (i = 0; i < 256; i++) {
crc = 0;
c = i << 56;
for (j = 0; j < 8; j++) {
if ((crc ^ c) & 0x8000000000000000ULL)
crc = (crc << 1) ^ CRC64_ECMA182_POLY;
else
crc <<= 1;
c <<= 1;
}
crc64_table[i] = crc;
}
}
static void print_crc64_table(void)
{
int i;
printf("/* this file is generated - do not edit */\n\n");
printf("#include <linux/types.h>\n");
printf("#include <linux/cache.h>\n\n");
printf("static const u64 ____cacheline_aligned crc64table[256] = {\n");
for (i = 0; i < 256; i++) {
printf("\t0x%016" PRIx64 "ULL", crc64_table[i]);
if (i & 0x1)
printf(",\n");
else
printf(", ");
}
printf("};\n");
}
int main(int argc, char *argv[])
{
generate_crc64_table();
print_crc64_table();
return 0;
}