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 #ifndef __ASSEMBLY__
   9 #define __ASSEMBLY__                    /* Dirty trick to get only #defines */
  10 #endif
  11 #define __ASM_STUB_PROCESSOR_H__        /* don't include asm/processor. */
  12 #include <config.h>
  13 #undef  __ASSEMBLY__
  14 #include <environment.h>
  15 #include <linux/stringify.h>
  16
  17 /* Handle HOSTS that have prepended crap on symbol names, not TARGETS. */
  18 #if defined(__APPLE__)
  19 /* Leading underscore on symbols */
  20 #  define SYM_CHAR "_"
  21 #else /* No leading character on symbols */
  22 #  define SYM_CHAR
  23 #endif
  24
  25 /*
  26  * Generate embedded environment table
  27  * inside U-Boot image, if needed.
  28  */
  29 #if defined(ENV_IS_EMBEDDED) || defined(CONFIG_BUILD_ENVCRC)
  30 /*
  31  * Only put the environment in it's own section when we are building
  32  * U-Boot proper.  The host based program "tools/envcrc" does not need
  33  * a seperate section.  Note that ENV_CRC is only defined when building
  34  * U-Boot itself.
  35  */
  36 #if defined(CONFIG_SYS_USE_PPCENV) && \
  37         defined(ENV_CRC) /* Environment embedded in U-Boot .ppcenv section */
  38 /* XXX - This only works with GNU C */
  39 #  define __PPCENV__    __attribute__ ((section(".ppcenv")))
  40 #  define __PPCTEXT__   __attribute__ ((section(".text")))
  41
  42 #elif defined(USE_HOSTCC) /* Native for 'tools/envcrc' */
  43 #  define __PPCENV__    /*XXX DO_NOT_DEL_THIS_COMMENT*/
  44 #  define __PPCTEXT__   /*XXX DO_NOT_DEL_THIS_COMMENT*/
  45
  46 #else /* Environment is embedded in U-Boot's .text section */
  47 /* XXX - This only works with GNU C */
  48 #  define __PPCENV__    __attribute__ ((section(".text")))
  49 #  define __PPCTEXT__   __attribute__ ((section(".text")))
  50 #endif
  51
  52 /*
  53  * Macros to generate global absolutes.
  54  */
  55 #if defined(__bfin__)
  56 # define GEN_SET_VALUE(name, value)     \
  57         asm(".set " GEN_SYMNAME(name) ", " GEN_VALUE(value))
  58 #else
  59 # define GEN_SET_VALUE(name, value)     \
  60         asm(GEN_SYMNAME(name) " = " GEN_VALUE(value))
  61 #endif
  62 #define GEN_SYMNAME(str)        SYM_CHAR #str
  63 #define GEN_VALUE(str)          #str
  64 #define GEN_ABS(name, value)                    \
  65         asm(".globl " GEN_SYMNAME(name));       \
  66         GEN_SET_VALUE(name, value)
  67
  68 /*
  69  * Check to see if we are building with a
  70  * computed CRC.  Otherwise define it as ~0.
  71  */
  72 #if !defined(ENV_CRC)
  73 #  define ENV_CRC       (~0)
  74 #endif
  75
  76 #define DEFAULT_ENV_INSTANCE_EMBEDDED
  77 #include <env_default.h>
  78
  79 #ifdef CONFIG_ENV_ADDR_REDUND
  80 env_t redundand_environment __PPCENV__ = {
  81         0,              /* CRC Sum: invalid */
  82         0,              /* Flags:   invalid */
  83         {
  84         "\0"
  85         }
  86 };
  87 #endif  /* CONFIG_ENV_ADDR_REDUND */
  88
  89 /*
  90  * These will end up in the .text section
  91  * if the environment strings are embedded
  92  * in the image.  When this is used for
  93  * tools/envcrc, they are placed in the
  94  * .data/.sdata section.
  95  *
  96  */
  97 unsigned long env_size __PPCTEXT__ = sizeof(env_t);
  98
  99 /*
 100  * Add in absolutes.
 101  */
 102 GEN_ABS(env_offset, CONFIG_ENV_OFFSET);
 103
 104 #endif /* ENV_IS_EMBEDDED */