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