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 #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       (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
  27 # endif
  28 # ifndef  CONFIG_ENV_OFFSET
  29 #  define CONFIG_ENV_OFFSET (CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)
  30 # endif
  31 # if !defined(CONFIG_ENV_ADDR_REDUND) && defined(CONFIG_ENV_OFFSET_REDUND)
  32 #  define CONFIG_ENV_ADDR_REDUND        (CONFIG_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 defined(CONFIG_ENV_ADDR_REDUND) && !defined(CONFIG_ENV_SIZE_REDUND)
  38 #  define CONFIG_ENV_SIZE_REDUND        CONFIG_ENV_SIZE
  39 # endif
  40 # if (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
  41      ((CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <= (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN))
  42 #  define ENV_IS_EMBEDDED
  43 # endif
  44 # if defined(CONFIG_ENV_ADDR_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
  45 #  define CONFIG_SYS_REDUNDAND_ENVIRONMENT
  46 # endif
  47 #endif  /* CONFIG_ENV_IS_IN_FLASH */
  48
  49 #if defined(ENV_IS_EMBEDDED) && !defined(CONFIG_BUILD_ENVCRC)
  50 # define CONFIG_BUILD_ENVCRC
  51 #endif
  52
  53 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
  54 # define ENV_HEADER_SIZE        (sizeof(uint32_t) + 1)
  55 #else
  56 # define ENV_HEADER_SIZE        (sizeof(uint32_t))
  57 #endif
  58
  59 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
  60
  61
  62 #ifdef CONFIG_BUILD_ENVCRC
  63 # include <environment.h>
  64 extern unsigned int env_size;
  65 extern env_t environment;
  66 #endif  /* CONFIG_BUILD_ENVCRC */
  67
  68 extern uint32_t crc32 (uint32_t, const unsigned char *, unsigned int);
  69
  70 int main (int argc, char **argv)
  71 {
  72 #ifdef CONFIG_BUILD_ENVCRC
  73         unsigned char pad = 0x00;
  74         uint32_t crc;
  75         unsigned char *envptr = (unsigned char *)&environment,
  76                 *dataptr = envptr + ENV_HEADER_SIZE;
  77         unsigned int datasize = ENV_SIZE;
  78         unsigned int eoe;
  79
  80         if (argv[1] && !strncmp(argv[1], "--binary", 8)) {
  81                 int ipad = 0xff;
  82                 if (argv[1][8] == '=')
  83                         sscanf(argv[1] + 9, "%i", &ipad);
  84                 pad = ipad;
  85         }
  86
  87         if (pad) {
  88                 /* find the end of env */
  89                 for (eoe = 0; eoe < datasize - 1; ++eoe)
  90                         if (!dataptr[eoe] && !dataptr[eoe+1]) {
  91                                 eoe += 2;
  92                                 break;
  93                         }
  94                 if (eoe < datasize - 1)
  95                         memset(dataptr + eoe, pad, datasize - eoe);
  96         }
  97
  98         crc = crc32 (0, dataptr, datasize);
  99
 100         /* Check if verbose mode is activated passing a parameter to the program */
 101         if (argc > 1) {
 102                 if (!strncmp(argv[1], "--binary", 8)) {
 103                         int le = (argc > 2 ? !strcmp(argv[2], "le") : 1);
 104                         size_t i, start, end, step;
 105                         if (le) {
 106                                 start = 0;
 107                                 end = ENV_HEADER_SIZE;
 108                                 step = 1;
 109                         } else {
 110                                 start = ENV_HEADER_SIZE - 1;
 111                                 end = -1;
 112                                 step = -1;
 113                         }
 114                         for (i = start; i != end; i += step)
 115                                 printf("%c", (crc & (0xFF << (i * 8))) >> (i * 8));
 116                         if (fwrite(dataptr, 1, datasize, stdout) != datasize)
 117                                 fprintf(stderr, "fwrite() failed: %s\n", strerror(errno));
 118                 } else {
 119                         printf("CRC32 from offset %08X to %08X of environment = %08X\n",
 120                                 (unsigned int) (dataptr - envptr),
 121                                 (unsigned int) (dataptr - envptr) + datasize,
 122                                 crc);
 123                 }
 124         } else {
 125                 printf ("0x%08X\n", crc);
 126         }
 127 #else
 128         printf ("0\n");
 129 #endif
 130         return EXIT_SUCCESS;
 131 }