1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright 2001
4 * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
5 */
6
7#include <errno.h>
8#include <stdio.h>
9#include <stdint.h>
10#include <stdlib.h>
11#include <string.h>
12#include <u-boot/crc.h>
13#include <unistd.h>
14
15#include <linux/kconfig.h>
16
17#ifndef __ASSEMBLY__
18#define	__ASSEMBLY__			/* Dirty trick to get only #defines	*/
19#endif
20#define	__ASM_STUB_PROCESSOR_H__	/* don't include asm/processor.		*/
21#include <config.h>
22#undef	__ASSEMBLY__
23
24#if defined(CONFIG_ENV_IS_IN_FLASH)
25# ifndef  CONFIG_ENV_ADDR
26#  define CONFIG_ENV_ADDR	(CFG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
27# endif
28# ifndef  CONFIG_ENV_OFFSET
29#  define CONFIG_ENV_OFFSET (CONFIG_ENV_ADDR - CFG_SYS_FLASH_BASE)
30# endif
31# if !defined(CONFIG_ENV_ADDR_REDUND) && defined(CONFIG_ENV_OFFSET_REDUND)
32#  define CONFIG_ENV_ADDR_REDUND	(CFG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET_REDUND)
33# endif
34# ifndef  CONFIG_ENV_SIZE
35#  define CONFIG_ENV_SIZE	CONFIG_ENV_SECT_SIZE
36# endif
37# if (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
38     ((CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <= (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN))
39#  define ENV_IS_EMBEDDED
40# endif
41#endif	/* CONFIG_ENV_IS_IN_FLASH */
42
43#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
44# define ENV_HEADER_SIZE	(sizeof(uint32_t) + 1)
45#else
46# define ENV_HEADER_SIZE	(sizeof(uint32_t))
47#endif
48
49#define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
50
51
52#ifdef ENV_IS_EMBEDDED
53# include <env_internal.h>
54extern unsigned int env_size;
55extern env_t embedded_environment;
56#endif	/* ENV_IS_EMBEDDED */
57
58extern uint32_t crc32(uint32_t, const unsigned char *, unsigned int);
59
60int main (int argc, char **argv)
61{
62#ifdef ENV_IS_EMBEDDED
63	unsigned char pad = 0x00;
64	uint32_t crc;
65	unsigned char *envptr = (unsigned char *)&embedded_environment,
66		*dataptr = envptr + ENV_HEADER_SIZE;
67	unsigned int datasize = ENV_SIZE;
68	unsigned int eoe;
69
70	if (argv[1] && !strncmp(argv[1], "--binary", 8)) {
71		int ipad = 0xff;
72		if (argv[1][8] == '=')
73			sscanf(argv[1] + 9, "%i", &ipad);
74		pad = ipad;
75	}
76
77	if (pad) {
78		/* find the end of env */
79		for (eoe = 0; eoe < datasize - 1; ++eoe)
80			if (!dataptr[eoe] && !dataptr[eoe+1]) {
81				eoe += 2;
82				break;
83			}
84		if (eoe < datasize - 1)
85			memset(dataptr + eoe, pad, datasize - eoe);
86	}
87
88	crc = crc32(0, dataptr, datasize);
89
90	/* Check if verbose mode is activated passing a parameter to the program */
91	if (argc > 1) {
92		if (!strncmp(argv[1], "--binary", 8)) {
93			int le = (argc > 2 ? !strcmp(argv[2], "le") : 1);
94			size_t i, start, end, step;
95			if (le) {
96				start = 0;
97				end = ENV_HEADER_SIZE;
98				step = 1;
99			} else {
100				start = ENV_HEADER_SIZE - 1;
101				end = -1;
102				step = -1;
103			}
104			for (i = start; i != end; i += step)
105				printf("%c", (crc & (0xFF << (i * 8))) >> (i * 8));
106			if (fwrite(dataptr, 1, datasize, stdout) != datasize)
107				fprintf(stderr, "fwrite() failed: %s\n", strerror(errno));
108		} else {
109			printf("CRC32 from offset %08X to %08X of environment = %08X\n",
110				(unsigned int) (dataptr - envptr),
111				(unsigned int) (dataptr - envptr) + datasize,
112				crc);
113		}
114	} else {
115		printf ("0x%08X\n", crc);
116	}
117#else
118	printf ("0\n");
119#endif
120	return EXIT_SUCCESS;
121}
122