tools/envcrc.c

   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 <unistd.h>
  13
  14 #include <linux/kconfig.h>
  15
  16 #ifndef __ASSEMBLY__
  17 #define __ASSEMBLY__                    /* Dirty trick to get only #defines     */
  18 #endif
  19 #define __ASM_STUB_PROCESSOR_H__        /* don't include asm/processor.         */
  20 #include <config.h>
  21 #undef  __ASSEMBLY__
  22
  23 #if defined(CONFIG_ENV_IS_IN_FLASH)
  24 # ifndef  CONFIG_ENV_ADDR
  25 #  define CONFIG_ENV_ADDR       (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
  26 # endif
  27 # ifndef  CONFIG_ENV_OFFSET
  28 #  define CONFIG_ENV_OFFSET (CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)
  29 # endif
  30 # if !defined(CONFIG_ENV_ADDR_REDUND) && defined(CONFIG_ENV_OFFSET_REDUND)
  31 #  define CONFIG_ENV_ADDR_REDUND        (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET_REDUND)
  32 # endif
  33 # ifndef  CONFIG_ENV_SIZE
  34 #  define CONFIG_ENV_SIZE       CONFIG_ENV_SECT_SIZE
  35 # endif
  36 # if defined(CONFIG_ENV_ADDR_REDUND) && !defined(CONFIG_ENV_SIZE_REDUND)
  37 #  define CONFIG_ENV_SIZE_REDUND        CONFIG_ENV_SIZE
  38 # endif
  39 # if (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
  40      ((CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <= (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN))
  41 #  define ENV_IS_EMBEDDED
  42 # endif
  43 # if defined(CONFIG_ENV_ADDR_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
  44 #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  45 # endif
  46 #endif  /* CONFIG_ENV_IS_IN_FLASH */
  47
  48 #if defined(ENV_IS_EMBEDDED) && !defined(CONFIG_BUILD_ENVCRC)
  49 # define CONFIG_BUILD_ENVCRC
  50 #endif
  51
  52 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
  53 # define ENV_HEADER_SIZE        (sizeof(uint32_t) + 1)
  54 #else
  55 # define ENV_HEADER_SIZE        (sizeof(uint32_t))
  56 #endif
  57
  58 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
  59
  60
  61 #ifdef CONFIG_BUILD_ENVCRC
  62 # include <environment.h>
  63 extern unsigned int env_size;
  64 extern env_t environment;
  65 #endif  /* CONFIG_BUILD_ENVCRC */
  66
  67 extern uint32_t crc32 (uint32_t, const unsigned char *, unsigned int);
  68
  69 int main (int argc, char **argv)
  70 {
  71 #ifdef CONFIG_BUILD_ENVCRC
  72         unsigned char pad = 0x00;
  73         uint32_t crc;
  74         unsigned char *envptr = (unsigned char *)&environment,
  75                 *dataptr = envptr + ENV_HEADER_SIZE;
  76         unsigned int datasize = ENV_SIZE;
  77         unsigned int eoe;
  78
  79         if (argv[1] && !strncmp(argv[1], "--binary", 8)) {
  80                 int ipad = 0xff;
  81                 if (argv[1][8] == '=')
  82                         sscanf(argv[1] + 9, "%i", &ipad);
  83                 pad = ipad;
  84         }
  85
  86         if (pad) {
  87                 /* find the end of env */
  88                 for (eoe = 0; eoe < datasize - 1; ++eoe)
  89                         if (!dataptr[eoe] && !dataptr[eoe+1]) {
  90                                 eoe += 2;
  91                                 break;
  92                         }
  93                 if (eoe < datasize - 1)
  94                         memset(dataptr + eoe, pad, datasize - eoe);
  95         }
  96
  97         crc = crc32 (0, dataptr, datasize);
  98
  99         /* Check if verbose mode is activated passing a parameter to the program */
 100         if (argc > 1) {
 101                 if (!strncmp(argv[1], "--binary", 8)) {
 102                         int le = (argc > 2 ? !strcmp(argv[2], "le") : 1);
 103                         size_t i, start, end, step;
 104                         if (le) {
 105                                 start = 0;
 106                                 end = ENV_HEADER_SIZE;
 107                                 step = 1;
 108                         } else {
 109                                 start = ENV_HEADER_SIZE - 1;
 110                                 end = -1;
 111                                 step = -1;
 112                         }
 113                         for (i = start; i != end; i += step)
 114                                 printf("%c", (crc & (0xFF << (i * 8))) >> (i * 8));
 115                         if (fwrite(dataptr, 1, datasize, stdout) != datasize)
 116                                 fprintf(stderr, "fwrite() failed: %s\n", strerror(errno));
 117                 } else {
 118                         printf("CRC32 from offset %08X to %08X of environment = %08X\n",
 119                                 (unsigned int) (dataptr - envptr),
 120                                 (unsigned int) (dataptr - envptr) + datasize,
 121                                 crc);
 122                 }
 123         } else {
 124                 printf ("0x%08X\n", crc);
 125         }
 126 #else
 127         printf ("0\n");
 128 #endif
 129         return EXIT_SUCCESS;
 130 }