env/embedded.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001
   4  * Erik Theisen,  Wave 7 Optics, etheisen@mindspring.com.
   5  */
   6
   7 #ifdef USE_HOSTCC
   8 #include <linux/kconfig.h>
   9 #endif
  10
  11 #ifndef __ASSEMBLY__
  12 #define __ASSEMBLY__                    /* Dirty trick to get only #defines */
  13 #endif
  14 #define __ASM_STUB_PROCESSOR_H__        /* don't include asm/processor. */
  15 #include <config.h>
  16 #undef  __ASSEMBLY__
  17 #include <env_internal.h>
  18 #include <linux/stringify.h>
  19
  20 /* Handle HOSTS that have prepended crap on symbol names, not TARGETS. */
  21 #if defined(__APPLE__)
  22 /* Leading underscore on symbols */
  23 #  define SYM_CHAR "_"
  24 #else /* No leading character on symbols */
  25 #  define SYM_CHAR
  26 #endif
  27
  28 /*
  29  * Generate embedded environment table
  30  * inside U-Boot image, if needed.
  31  */
  32 #if defined(ENV_IS_EMBEDDED)
  33 /*
  34  * Put the environment in the .text section when we are building
  35  * U-Boot proper.  The host based program "tools/envcrc" does not need
  36  * a seperate section.
  37  */
  38 #if defined(USE_HOSTCC) /* Native for 'tools/envcrc' */
  39 #  define __UBOOT_ENV_SECTION__(name)   /*XXX DO_NOT_DEL_THIS_COMMENT*/
  40
  41 #else /* Environment is embedded in U-Boot's .text section */
  42 /* XXX - This only works with GNU C */
  43 #  define __UBOOT_ENV_SECTION__(name)   __attribute__ ((section(".text."#name)))
  44 #endif
  45
  46 /*
  47  * Macros to generate global absolutes.
  48  */
  49 #if defined(__bfin__)
  50 # define GEN_SET_VALUE(name, value)     \
  51         asm(".set " GEN_SYMNAME(name) ", " GEN_VALUE(value))
  52 #else
  53 # define GEN_SET_VALUE(name, value)     \
  54         asm(GEN_SYMNAME(name) " = " GEN_VALUE(value))
  55 #endif
  56 #define GEN_SYMNAME(str)        SYM_CHAR #str
  57 #define GEN_VALUE(str)          #str
  58 #define GEN_ABS(name, value)                    \
  59         asm(".globl " GEN_SYMNAME(name));       \
  60         GEN_SET_VALUE(name, value)
  61
  62 /*
  63  * Check to see if we are building with a
  64  * computed CRC.  Otherwise define it as ~0.
  65  */
  66 #if !defined(ENV_CRC)
  67 #  define ENV_CRC       (~0)
  68 #endif
  69
  70 #define DEFAULT_ENV_INSTANCE_EMBEDDED
  71 #include <config.h>
  72 #include <env_default.h>
  73
  74 #ifdef CONFIG_ENV_ADDR_REDUND
  75 env_t redundand_environment __UBOOT_ENV_SECTION__(redundand_environment) = {
  76         0,              /* CRC Sum: invalid */
  77         0,              /* Flags:   invalid */
  78         {
  79         "\0"
  80         }
  81 };
  82 #endif  /* CONFIG_ENV_ADDR_REDUND */
  83
  84 /*
  85  * These will end up in the .text section
  86  * if the environment strings are embedded
  87  * in the image.  When this is used for
  88  * tools/envcrc, they are placed in the
  89  * .data/.sdata section.
  90  *
  91  */
  92 unsigned long env_size __UBOOT_ENV_SECTION__(env_size) = sizeof(env_t);
  93
  94 /*
  95  * Add in absolutes.
  96  */
  97 GEN_ABS(env_offset, (CONFIG_ENV_ADDR - CFG_SYS_FLASH_BASE));
  98
  99 #endif /* ENV_IS_EMBEDDED */