env/embedded.c

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