tools/envcrc.c

   1 /*
   2  * (C) Copyright 2001
   3  * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <errno.h>
   9 #include <stdio.h>
  10 #include <stdint.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <unistd.h>
  14
  15 #ifndef __ASSEMBLY__
  16 #define __ASSEMBLY__                    /* Dirty trick to get only #defines     */
  17 #endif
  18 #define __ASM_STUB_PROCESSOR_H__        /* don't include asm/processor.         */
  19 #include <config.h>
  20 #undef  __ASSEMBLY__
  21
  22 #if defined(CONFIG_ENV_IS_IN_FLASH)
  23 # ifndef  CONFIG_ENV_ADDR
  24 #  define CONFIG_ENV_ADDR       (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
  25 # endif
  26 # ifndef  CONFIG_ENV_OFFSET
  27 #  define CONFIG_ENV_OFFSET (CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)
  28 # endif
  29 # if !defined(CONFIG_ENV_ADDR_REDUND) && defined(CONFIG_ENV_OFFSET_REDUND)
  30 #  define CONFIG_ENV_ADDR_REDUND        (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET_REDUND)
  31 # endif
  32 # ifndef  CONFIG_ENV_SIZE
  33 #  define CONFIG_ENV_SIZE       CONFIG_ENV_SECT_SIZE
  34 # endif
  35 # if defined(CONFIG_ENV_ADDR_REDUND) && !defined(CONFIG_ENV_SIZE_REDUND)
  36 #  define CONFIG_ENV_SIZE_REDUND        CONFIG_ENV_SIZE
  37 # endif
  38 # if (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
  39      ((CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <= (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN))
  40 #  define ENV_IS_EMBEDDED
  41 # endif
  42 # if defined(CONFIG_ENV_ADDR_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
  43 #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  44 # endif
  45 #endif  /* CONFIG_ENV_IS_IN_FLASH */
  46
  47 #if defined(ENV_IS_EMBEDDED) && !defined(CONFIG_BUILD_ENVCRC)
  48 # define CONFIG_BUILD_ENVCRC
  49 #endif
  50
  51 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
  52 # define ENV_HEADER_SIZE        (sizeof(uint32_t) + 1)
  53 #else
  54 # define ENV_HEADER_SIZE        (sizeof(uint32_t))
  55 #endif
  56
  57 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
  58
  59
  60 #ifdef CONFIG_BUILD_ENVCRC
  61 # include <environment.h>
  62 extern unsigned int env_size;
  63 extern env_t environment;
  64 #endif  /* CONFIG_BUILD_ENVCRC */
  65
  66 extern uint32_t crc32 (uint32_t, const unsigned char *, unsigned int);
  67
  68 int main (int argc, char **argv)
  69 {
  70 #ifdef CONFIG_BUILD_ENVCRC
  71         unsigned char pad = 0x00;
  72         uint32_t crc;
  73         unsigned char *envptr = (unsigned char *)&environment,
  74                 *dataptr = envptr + ENV_HEADER_SIZE;
  75         unsigned int datasize = ENV_SIZE;
  76         unsigned int eoe;
  77
  78         if (argv[1] && !strncmp(argv[1], "--binary", 8)) {
  79                 int ipad = 0xff;
  80                 if (argv[1][8] == '=')
  81                         sscanf(argv[1] + 9, "%i", &ipad);
  82                 pad = ipad;
  83         }
  84
  85         if (pad) {
  86                 /* find the end of env */
  87                 for (eoe = 0; eoe < datasize - 1; ++eoe)
  88                         if (!dataptr[eoe] && !dataptr[eoe+1]) {
  89                                 eoe += 2;
  90                                 break;
  91                         }
  92                 if (eoe < datasize - 1)
  93                         memset(dataptr + eoe, pad, datasize - eoe);
  94         }
  95
  96         crc = crc32 (0, dataptr, datasize);
  97
  98         /* Check if verbose mode is activated passing a parameter to the program */
  99         if (argc > 1) {
 100                 if (!strncmp(argv[1], "--binary", 8)) {
 101                         int le = (argc > 2 ? !strcmp(argv[2], "le") : 1);
 102                         size_t i, start, end, step;
 103                         if (le) {
 104                                 start = 0;
 105                                 end = ENV_HEADER_SIZE;
 106                                 step = 1;
 107                         } else {
 108                                 start = ENV_HEADER_SIZE - 1;
 109                                 end = -1;
 110                                 step = -1;
 111                         }
 112                         for (i = start; i != end; i += step)
 113                                 printf("%c", (crc & (0xFF << (i * 8))) >> (i * 8));
 114                         if (fwrite(dataptr, 1, datasize, stdout) != datasize)
 115                                 fprintf(stderr, "fwrite() failed: %s\n", strerror(errno));
 116                 } else {
 117                         printf("CRC32 from offset %08X to %08X of environment = %08X\n",
 118                                 (unsigned int) (dataptr - envptr),
 119                                 (unsigned int) (dataptr - envptr) + datasize,
 120                                 crc);
 121                 }
 122         } else {
 123                 printf ("0x%08X\n", crc);
 124         }
 125 #else
 126         printf ("0\n");
 127 #endif
 128         return EXIT_SUCCESS;
 129 }