Skip to content

Commit 6d89325

Browse files
rivos-eblotjwnrt
rivos-eblot
authored and
jwnrt
committed
util: export CRC32[C] lookup tables
These are needed for the RISC-V Zbr0p93 CRC32 instructions which pre-XOR the data into the CRC state before the instruction is executed, making the zlib crc32 and QEMU crc32c implementations inappropriate. https://github.com/riscv/riscv-bitmanip/releases/download/v0.93/bitmanip-0.93.pdf Signed-off-by: James Wainwright <james.wainwright@lowrisc.org>
1 parent 3fb456e commit 6d89325

5 files changed

Lines changed: 107 additions & 2 deletions

File tree

‎include/qemu/crc32.h‎

Lines changed: 18 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,18 @@
1+
/*
2+
* CRC32 Checksum
3+
*
4+
* Copyright (c) 2026 QEMU contributors
5+
*
6+
* This program is free software; you can redistribute it and/or modify it
7+
* under the terms of the GNU General Public License as published by the Free
8+
* Software Foundation; either version 2 of the License, or (at your option)
9+
* any later version.
10+
*
11+
*/
12+
13+
#ifndef QEMU_CRC32_H
14+
#define QEMU_CRC32_H
15+
16+
extern const uint32_t crc32_table[256];
17+
18+
#endif

‎include/qemu/crc32c.h‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -28,6 +28,7 @@
2828
#ifndef QEMU_CRC32C_H
2929
#define QEMU_CRC32C_H
3030

31+
extern const uint32_t crc32c_table[256];
3132

3233
uint32_t crc32c(uint32_t crc, const uint8_t *data, unsigned int length);
3334
uint32_t iov_crc32c(uint32_t crc, const struct iovec *iov, size_t iov_cnt);

‎util/crc32.c‎

Lines changed: 85 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,85 @@
1+
/*
2+
* Constants for computing CRC32 checksums
3+
*
4+
* Copyright (c) 2026 QEMU contributors
5+
*
6+
* This program is free software; you can redistribute it and/or modify it
7+
* under the terms of the GNU General Public License as published by the Free
8+
* Software Foundation; either version 2 of the License, or (at your option)
9+
* any later version.
10+
*
11+
*/
12+
13+
#include "qemu/osdep.h"
14+
#include "qemu/crc32.h"
15+
16+
/*
17+
* CRC-32 table (reversed; polynomial 0xEDB88320).
18+
*/
19+
20+
const uint32_t crc32_table[256] = {
21+
0x00000000u, 0x77073096u, 0xee0e612cu, 0x990951bau,
22+
0x076dc419u, 0x706af48fu, 0xe963a535u, 0x9e6495a3u,
23+
0x0edb8832u, 0x79dcb8a4u, 0xe0d5e91eu, 0x97d2d988u,
24+
0x09b64c2bu, 0x7eb17cbdu, 0xe7b82d07u, 0x90bf1d91u,
25+
0x1db71064u, 0x6ab020f2u, 0xf3b97148u, 0x84be41deu,
26+
0x1adad47du, 0x6ddde4ebu, 0xf4d4b551u, 0x83d385c7u,
27+
0x136c9856u, 0x646ba8c0u, 0xfd62f97au, 0x8a65c9ecu,
28+
0x14015c4fu, 0x63066cd9u, 0xfa0f3d63u, 0x8d080df5u,
29+
0x3b6e20c8u, 0x4c69105eu, 0xd56041e4u, 0xa2677172u,
30+
0x3c03e4d1u, 0x4b04d447u, 0xd20d85fdu, 0xa50ab56bu,
31+
0x35b5a8fau, 0x42b2986cu, 0xdbbbc9d6u, 0xacbcf940u,
32+
0x32d86ce3u, 0x45df5c75u, 0xdcd60dcfu, 0xabd13d59u,
33+
0x26d930acu, 0x51de003au, 0xc8d75180u, 0xbfd06116u,
34+
0x21b4f4b5u, 0x56b3c423u, 0xcfba9599u, 0xb8bda50fu,
35+
0x2802b89eu, 0x5f058808u, 0xc60cd9b2u, 0xb10be924u,
36+
0x2f6f7c87u, 0x58684c11u, 0xc1611dabu, 0xb6662d3du,
37+
0x76dc4190u, 0x01db7106u, 0x98d220bcu, 0xefd5102au,
38+
0x71b18589u, 0x06b6b51fu, 0x9fbfe4a5u, 0xe8b8d433u,
39+
0x7807c9a2u, 0x0f00f934u, 0x9609a88eu, 0xe10e9818u,
40+
0x7f6a0dbbu, 0x086d3d2du, 0x91646c97u, 0xe6635c01u,
41+
0x6b6b51f4u, 0x1c6c6162u, 0x856530d8u, 0xf262004eu,
42+
0x6c0695edu, 0x1b01a57bu, 0x8208f4c1u, 0xf50fc457u,
43+
0x65b0d9c6u, 0x12b7e950u, 0x8bbeb8eau, 0xfcb9887cu,
44+
0x62dd1ddfu, 0x15da2d49u, 0x8cd37cf3u, 0xfbd44c65u,
45+
0x4db26158u, 0x3ab551ceu, 0xa3bc0074u, 0xd4bb30e2u,
46+
0x4adfa541u, 0x3dd895d7u, 0xa4d1c46du, 0xd3d6f4fbu,
47+
0x4369e96au, 0x346ed9fcu, 0xad678846u, 0xda60b8d0u,
48+
0x44042d73u, 0x33031de5u, 0xaa0a4c5fu, 0xdd0d7cc9u,
49+
0x5005713cu, 0x270241aau, 0xbe0b1010u, 0xc90c2086u,
50+
0x5768b525u, 0x206f85b3u, 0xb966d409u, 0xce61e49fu,
51+
0x5edef90eu, 0x29d9c998u, 0xb0d09822u, 0xc7d7a8b4u,
52+
0x59b33d17u, 0x2eb40d81u, 0xb7bd5c3bu, 0xc0ba6cadu,
53+
0xedb88320u, 0x9abfb3b6u, 0x03b6e20cu, 0x74b1d29au,
54+
0xead54739u, 0x9dd277afu, 0x04db2615u, 0x73dc1683u,
55+
0xe3630b12u, 0x94643b84u, 0x0d6d6a3eu, 0x7a6a5aa8u,
56+
0xe40ecf0bu, 0x9309ff9du, 0x0a00ae27u, 0x7d079eb1u,
57+
0xf00f9344u, 0x8708a3d2u, 0x1e01f268u, 0x6906c2feu,
58+
0xf762575du, 0x806567cbu, 0x196c3671u, 0x6e6b06e7u,
59+
0xfed41b76u, 0x89d32be0u, 0x10da7a5au, 0x67dd4accu,
60+
0xf9b9df6fu, 0x8ebeeff9u, 0x17b7be43u, 0x60b08ed5u,
61+
0xd6d6a3e8u, 0xa1d1937eu, 0x38d8c2c4u, 0x4fdff252u,
62+
0xd1bb67f1u, 0xa6bc5767u, 0x3fb506ddu, 0x48b2364bu,
63+
0xd80d2bdau, 0xaf0a1b4cu, 0x36034af6u, 0x41047a60u,
64+
0xdf60efc3u, 0xa867df55u, 0x316e8eefu, 0x4669be79u,
65+
0xcb61b38cu, 0xbc66831au, 0x256fd2a0u, 0x5268e236u,
66+
0xcc0c7795u, 0xbb0b4703u, 0x220216b9u, 0x5505262fu,
67+
0xc5ba3bbeu, 0xb2bd0b28u, 0x2bb45a92u, 0x5cb36a04u,
68+
0xc2d7ffa7u, 0xb5d0cf31u, 0x2cd99e8bu, 0x5bdeae1du,
69+
0x9b64c2b0u, 0xec63f226u, 0x756aa39cu, 0x026d930au,
70+
0x9c0906a9u, 0xeb0e363fu, 0x72076785u, 0x05005713u,
71+
0x95bf4a82u, 0xe2b87a14u, 0x7bb12baeu, 0x0cb61b38u,
72+
0x92d28e9bu, 0xe5d5be0du, 0x7cdcefb7u, 0x0bdbdf21u,
73+
0x86d3d2d4u, 0xf1d4e242u, 0x68ddb3f8u, 0x1fda836eu,
74+
0x81be16cdu, 0xf6b9265bu, 0x6fb077e1u, 0x18b74777u,
75+
0x88085ae6u, 0xff0f6a70u, 0x66063bcau, 0x11010b5cu,
76+
0x8f659effu, 0xf862ae69u, 0x616bffd3u, 0x166ccf45u,
77+
0xa00ae278u, 0xd70dd2eeu, 0x4e048354u, 0x3903b3c2u,
78+
0xa7672661u, 0xd06016f7u, 0x4969474du, 0x3e6e77dbu,
79+
0xaed16a4au, 0xd9d65adcu, 0x40df0b66u, 0x37d83bf0u,
80+
0xa9bcae53u, 0xdebb9ec5u, 0x47b2cf7fu, 0x30b5ffe9u,
81+
0xbdbdf21cu, 0xcabac28au, 0x53b39330u, 0x24b4a3a6u,
82+
0xbad03605u, 0xcdd70693u, 0x54de5729u, 0x23d967bfu,
83+
0xb3667a2eu, 0xc4614ab8u, 0x5d681b02u, 0x2a6f2b94u,
84+
0xb40bbe37u, 0xc30c8ea1u, 0x5a05df1bu, 0x2d02ef8du
85+
};

‎util/crc32c.c‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
11
/*
22
* Castagnoli CRC32C Checksum Algorithm
33
*
4-
* Polynomial: 0x11EDC6F41
4+
* Polynomial: 0x1EDC6F41
55
*
66
* Castagnoli93: Guy Castagnoli and Stefan Braeuer and Martin Herrman
77
* "Optimization of Cyclic Redundancy-Check Codes with 24
@@ -37,7 +37,7 @@
3737
* reflect output bytes = true
3838
*/
3939

40-
static const uint32_t crc32c_table[256] = {
40+
const uint32_t crc32c_table[256] = {
4141
0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
4242
0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
4343
0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,

‎util/meson.build‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -44,6 +44,7 @@ util_ss.add(files('id.c'))
4444
util_ss.add(files('qemu-config.c', 'notify.c'))
4545
util_ss.add(files('qemu-option.c', 'qemu-progress.c'))
4646
util_ss.add(files('keyval.c'))
47+
util_ss.add(files('crc32.c'))
4748
util_ss.add(files('crc32c.c'))
4849
util_ss.add(files('uuid.c'))
4950
util_ss.add(files('getauxval.c'))

0 commit comments

Comments
 (0)