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tools/pbl_crc32.c
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * Copyright 2012 Freescale Semiconductor, Inc. * * Cleaned up and refactored by Charles Manning. |
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*/ #include "pblimage.h" |
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#include <u-boot/crc.h> |
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static uint32_t crc_table[256]; static int crc_table_valid; static void make_crc_table(void) { uint32_t mask; int i, j; uint32_t poly; /* polynomial exclusive-or pattern */ if (crc_table_valid) return; /* * the polynomial used by PBL is 1 + x1 + x2 + x4 + x5 + x7 + x8 + x10 * + x11 + x12 + x16 + x22 + x23 + x26 + x32. */ poly = 0x04c11db7; for (i = 0; i < 256; i++) { mask = i << 24; for (j = 0; j < 8; j++) { if (mask & 0x80000000) mask = (mask << 1) ^ poly; else mask <<= 1; } crc_table[i] = mask; } crc_table_valid = 1; } uint32_t pbl_crc32(uint32_t in_crc, const char *buf, uint32_t len) { uint32_t crc32_val; int i; make_crc_table(); crc32_val = ~in_crc; for (i = 0; i < len; i++) crc32_val = (crc32_val << 8) ^ crc_table[(crc32_val >> 24) ^ (*buf++ & 0xff)]; return crc32_val; } |