common/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  * Only put the environment in it's own section when we are building
  34  * U-Boot proper.  The host based program "tools/envcrc" does not need
  35  * a seperate section.  Note that ENV_CRC is only defined when building
  36  * U-Boot itself.
  37  */
  38 #if defined(CONFIG_SYS_USE_PPCENV) && \
  39         defined(ENV_CRC) /* Environment embedded in U-Boot .ppcenv section */
  40 /* XXX - This only works with GNU C */
  41 #  define __PPCENV__    __attribute__ ((section(".ppcenv")))
  42 #  define __PPCTEXT__   __attribute__ ((section(".text")))
  43
  44 #elif defined(USE_HOSTCC) /* Native for 'tools/envcrc' */
  45 #  define __PPCENV__    /*XXX DO_NOT_DEL_THIS_COMMENT*/
  46 #  define __PPCTEXT__   /*XXX DO_NOT_DEL_THIS_COMMENT*/
  47
  48 #else /* Environment is embedded in U-Boot's .text section */
  49 /* XXX - This only works with GNU C */
  50 #  define __PPCENV__    __attribute__ ((section(".text")))
  51 #  define __PPCTEXT__   __attribute__ ((section(".text")))
  52 #endif
  53
  54 /*
  55  * Macros to generate global absolutes.
  56  */
  57 #if defined(__bfin__)
  58 # define GEN_SET_VALUE(name, value)     \
  59         asm(".set " GEN_SYMNAME(name) ", " GEN_VALUE(value))
  60 #else
  61 # define GEN_SET_VALUE(name, value)     \
  62         asm(GEN_SYMNAME(name) " = " GEN_VALUE(value))
  63 #endif
  64 #define GEN_SYMNAME(str)        SYM_CHAR #str
  65 #define GEN_VALUE(str)          #str
  66 #define GEN_ABS(name, value)                    \
  67         asm(".globl " GEN_SYMNAME(name));       \
  68         GEN_SET_VALUE(name, value)
  69
  70 /*
  71  * Check to see if we are building with a
  72  * computed CRC.  Otherwise define it as ~0.
  73  */
  74 #if !defined(ENV_CRC)
  75 #  define ENV_CRC       (~0)
  76 #endif
  77
  78 #define DEFAULT_ENV_INSTANCE_EMBEDDED
  79 #include <env_default.h>
  80
  81 #ifdef CONFIG_ENV_ADDR_REDUND
  82 env_t redundand_environment __PPCENV__ = {
  83         0,              /* CRC Sum: invalid */
  84         0,              /* Flags:   invalid */
  85         {
  86         "\0"
  87         }
  88 };
  89 #endif  /* CONFIG_ENV_ADDR_REDUND */
  90
  91 /*
  92  * These will end up in the .text section
  93  * if the environment strings are embedded
  94  * in the image.  When this is used for
  95  * tools/envcrc, they are placed in the
  96  * .data/.sdata section.
  97  *
  98  */
  99 unsigned long env_size __PPCTEXT__ = sizeof(env_t);
 100
 101 /*
 102  * Add in absolutes.
 103  */
 104 GEN_ABS(env_offset, CONFIG_ENV_OFFSET);
 105
 106 #endif /* ENV_IS_EMBEDDED */