Eric Lee / smarc-uboot | Embedian Git Server

Commit 60d18d3fe9d1a5db663711063cd0d5c915af377a

Authored by Simon Glass 2013-11-11 01:26:47 +0800

Exists in master and in 50 other branches

Add crc8 routine

Add an implementation of the CRC8 algorithm. This is required by the TPM
emulation, but is probably useful to U-Boot in general.

Signed-off-by: Simon Glass <sjg@chromium.org>

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>

Showing 3 changed files with 49 additions and 0 deletions Inline Diff

include/linux/crc8.h
lib/Makefile
lib/crc8.c

include/linux/crc8.h

Diff comments View file @ 60d18d3

File was created	1	/*
	2	* Copyright (c) 2013 Google, Inc
	3	*
	4	* SPDX-License-Identifier: GPL-2.0+
	5	*/
	6
	7
	8	#ifndef __linux_crc8_h
	9	#define __linux_crc8_h
	10
	11	/**
	12	* crc8() - Calculate and return CRC-8 of the data
	13	*
	14	* This uses an x^8 + x^2 + x + 1 polynomial. A table-based algorithm would
	15	* be faster, but for only a few bytes it isn't worth the code size
	16	*
	17	* @vptr: Buffer to checksum
	18	* @len: Length of buffer in bytes
	19	* @return CRC8 checksum
	20	*/
	21	unsigned int crc8(const unsigned char *vptr, int len);
	22
	23	#endif
	24

lib/Makefile

Diff comments View file @ 60d18d3

 #
 # (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # SPDX-License-Identifier:	GPL-2.0+
 #
 ifndef CONFIG_SPL_BUILD
 obj-$(CONFIG_RSA) += rsa/
 obj-$(CONFIG_LZMA) += lzma/
 obj-$(CONFIG_LZO) += lzo/
 obj-$(CONFIG_ZLIB) += zlib/
 obj-$(CONFIG_TIZEN) += tizen/
 obj-$(CONFIG_AES) += aes.o
 obj-$(CONFIG_BZIP2) += bzlib.o
 obj-$(CONFIG_BZIP2) += bzlib_crctable.o
 obj-$(CONFIG_BZIP2) += bzlib_decompress.o
 obj-$(CONFIG_BZIP2) += bzlib_randtable.o
 obj-$(CONFIG_BZIP2) += bzlib_huffman.o
 obj-$(CONFIG_USB_TTY) += circbuf.o
 obj-y += crc7.o
+obj-y += crc8.o
 obj-y += crc16.o
 obj-$(CONFIG_OF_CONTROL) += fdtdec.o
 obj-$(CONFIG_TEST_FDTDEC) += fdtdec_test.o
 obj-$(CONFIG_GZIP) += gunzip.o
 obj-$(CONFIG_GZIP_COMPRESSED) += gzip.o
 obj-y += initcall.o
 obj-$(CONFIG_LMB) += lmb.o
 obj-y += ldiv.o
 obj-$(CONFIG_MD5) += md5.o
 obj-y += net_utils.o
 obj-$(CONFIG_PHYSMEM) += physmem.o
 obj-y += qsort.o
 obj-$(CONFIG_SHA1) += sha1.o
 obj-$(CONFIG_SHA256) += sha256.o
 obj-y	+= strmhz.o
 obj-$(CONFIG_TPM) += tpm.o
 obj-$(CONFIG_RBTREE)	+= rbtree.o
 obj-$(CONFIG_BITREVERSE) += bitrev.o
 endif
 ifdef CONFIG_SPL_BUILD
 obj-$(CONFIG_SPL_YMODEM_SUPPORT) += crc16.o
 obj-$(CONFIG_SPL_NET_SUPPORT) += net_utils.o
 endif
 obj-$(CONFIG_ADDR_MAP) += addr_map.o
 obj-y += hashtable.o
 obj-y += errno.o
 obj-y += display_options.o
 obj-$(CONFIG_BCH) += bch.o
 obj-y += crc32.o
 obj-y += ctype.o
 obj-y += div64.o
 obj-y += hang.o
 obj-y += linux_string.o
 obj-$(CONFIG_REGEX) += slre.o
 obj-y += string.o
 obj-y += time.o
 obj-$(CONFIG_TRACE) += trace.o
 obj-$(CONFIG_BOOTP_PXE) += uuid.o
 obj-y += vsprintf.o
 obj-$(CONFIG_RANDOM_MACADDR) += rand.o
 obj-$(CONFIG_BOOTP_RANDOM_DELAY) += rand.o
 obj-$(CONFIG_CMD_LINK_LOCAL) += rand.o
 # SEE README.arm-unaligned-accesses
 $(obj)bzlib.o: CFLAGS += $(PLATFORM_NO_UNALIGNED)

lib/crc8.c

Diff comments View file @ 60d18d3

File was created	1	/*
	2	* Copyright (c) 2013 Google, Inc
	3	*
	4	* SPDX-License-Identifier: GPL-2.0+
	5	*/
	6
	7	#include "linux/crc8.h"
	8
	9	unsigned int crc8(const unsigned char *vptr, int len)
	10	{
	11	const unsigned char *data = vptr;
	12	unsigned int crc = 0;
	13	int i, j;
	14
	15	for (j = len; j; j--, data++) {
	16	crc ^= (*data << 8);
	17	for (i = 8; i; i--) {
	18	if (crc & 0x8000)
	19	crc ^= (0x1070 << 3);
	20	crc <<= 1;
	21	}
	22	}
	23
	24	return (crc >> 8) & 0xff;
	25	}
	26