1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright 2012 Freescale Semiconductor, Inc.
5 * Cleaned up and refactored by Charles Manning.
9 static uint32_t crc_table
[256];
10 static int crc_table_valid
;
12 static void make_crc_table(void)
16 uint32_t poly
; /* polynomial exclusive-or pattern */
22 * the polynomial used by PBL is 1 + x1 + x2 + x4 + x5 + x7 + x8 + x10
23 * + x11 + x12 + x16 + x22 + x23 + x26 + x32.
27 for (i
= 0; i
< 256; i
++) {
29 for (j
= 0; j
< 8; j
++) {
30 if (mask
& 0x80000000)
31 mask
= (mask
<< 1) ^ poly
;
41 uint32_t pbl_crc32(uint32_t in_crc
, const char *buf
, uint32_t len
)
50 for (i
= 0; i
< len
; i
++)
51 crc32_val
= (crc32_val
<< 8) ^
52 crc_table
[(crc32_val
>> 24) ^ (*buf
++ & 0xff)];