common/env_embedded.c

   1 /*
   2  * (C) Copyright 2001
   3  * Erik Theisen,  Wave 7 Optics, etheisen@mindspring.com.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #ifndef __ASSEMBLY__
  25 #define __ASSEMBLY__                    /* Dirty trick to get only #defines */
  26 #endif
  27 #define __ASM_STUB_PROCESSOR_H__        /* don't include asm/processor. */
  28 #include <config.h>
  29 #undef  __ASSEMBLY__
  30 #include <environment.h>
  31 #include <linux/stringify.h>
  32
  33 /* Handle HOSTS that have prepended crap on symbol names, not TARGETS. */
  34 #if defined(__APPLE__)
  35 /* Leading underscore on symbols */
  36 #  define SYM_CHAR "_"
  37 #else /* No leading character on symbols */
  38 #  define SYM_CHAR
  39 #endif
  40
  41 /*
  42  * Generate embedded environment table
  43  * inside U-Boot image, if needed.
  44  */
  45 #if defined(ENV_IS_EMBEDDED) || defined(CONFIG_BUILD_ENVCRC)
  46 /*
  47  * Only put the environment in it's own section when we are building
  48  * U-Boot proper.  The host based program "tools/envcrc" does not need
  49  * a seperate section.  Note that ENV_CRC is only defined when building
  50  * U-Boot itself.
  51  */
  52 #if (defined(CONFIG_SYS_USE_PPCENV) || defined(CONFIG_NAND_U_BOOT)) && \
  53         defined(ENV_CRC) /* Environment embedded in U-Boot .ppcenv section */
  54 /* XXX - This only works with GNU C */
  55 #  define __PPCENV__    __attribute__ ((section(".ppcenv")))
  56 #  define __PPCTEXT__   __attribute__ ((section(".text")))
  57
  58 #elif defined(USE_HOSTCC) /* Native for 'tools/envcrc' */
  59 #  define __PPCENV__    /*XXX DO_NOT_DEL_THIS_COMMENT*/
  60 #  define __PPCTEXT__   /*XXX DO_NOT_DEL_THIS_COMMENT*/
  61
  62 #else /* Environment is embedded in U-Boot's .text section */
  63 /* XXX - This only works with GNU C */
  64 #  define __PPCENV__    __attribute__ ((section(".text")))
  65 #  define __PPCTEXT__   __attribute__ ((section(".text")))
  66 #endif
  67
  68 /*
  69  * Macros to generate global absolutes.
  70  */
  71 #if defined(__bfin__)
  72 # define GEN_SET_VALUE(name, value)     \
  73         asm(".set " GEN_SYMNAME(name) ", " GEN_VALUE(value))
  74 #else
  75 # define GEN_SET_VALUE(name, value)     \
  76         asm(GEN_SYMNAME(name) " = " GEN_VALUE(value))
  77 #endif
  78 #define GEN_SYMNAME(str)        SYM_CHAR #str
  79 #define GEN_VALUE(str)          #str
  80 #define GEN_ABS(name, value)                    \
  81         asm(".globl " GEN_SYMNAME(name));       \
  82         GEN_SET_VALUE(name, value)
  83
  84 /*
  85  * Check to see if we are building with a
  86  * computed CRC.  Otherwise define it as ~0.
  87  */
  88 #if !defined(ENV_CRC)
  89 #  define ENV_CRC       (~0)
  90 #endif
  91
  92 #define DEFAULT_ENV_INSTANCE_EMBEDDED
  93 #include <env_default.h>
  94
  95 #ifdef CONFIG_ENV_ADDR_REDUND
  96 env_t redundand_environment __PPCENV__ = {
  97         0,              /* CRC Sum: invalid */
  98         0,              /* Flags:   invalid */
  99         {
 100         "\0"
 101         }
 102 };
 103 #endif  /* CONFIG_ENV_ADDR_REDUND */
 104
 105 /*
 106  * These will end up in the .text section
 107  * if the environment strings are embedded
 108  * in the image.  When this is used for
 109  * tools/envcrc, they are placed in the
 110  * .data/.sdata section.
 111  *
 112  */
 113 unsigned long env_size __PPCTEXT__ = sizeof(env_t);
 114
 115 /*
 116  * Add in absolutes.
 117  */
 118 GEN_ABS(env_offset, CONFIG_ENV_OFFSET);
 119
 120 #endif /* ENV_IS_EMBEDDED */