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