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