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bootloader/u-boot_2015_04/common/env_embedded.c 2.74 KB
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  /*
   * (C) Copyright 2001
   * Erik Theisen,  Wave 7 Optics, etheisen@mindspring.com.
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #ifndef __ASSEMBLY__
  #define	__ASSEMBLY__			/* Dirty trick to get only #defines */
  #endif
  #define	__ASM_STUB_PROCESSOR_H__	/* don't include asm/processor. */
  #include <config.h>
  #undef	__ASSEMBLY__
  #include <environment.h>
  #include <linux/stringify.h>
  
  /* Handle HOSTS that have prepended crap on symbol names, not TARGETS. */
  #if defined(__APPLE__)
  /* Leading underscore on symbols */
  #  define SYM_CHAR "_"
  #else /* No leading character on symbols */
  #  define SYM_CHAR
  #endif
  
  /*
   * Generate embedded environment table
   * inside U-Boot image, if needed.
   */
  #if defined(ENV_IS_EMBEDDED) || defined(CONFIG_BUILD_ENVCRC)
  /*
   * Only put the environment in it's own section when we are building
   * U-Boot proper.  The host based program "tools/envcrc" does not need
   * a seperate section.  Note that ENV_CRC is only defined when building
   * U-Boot itself.
   */
  #if defined(CONFIG_SYS_USE_PPCENV) && \
  	defined(ENV_CRC) /* Environment embedded in U-Boot .ppcenv section */
  /* XXX - This only works with GNU C */
  #  define __PPCENV__	__attribute__ ((section(".ppcenv")))
  #  define __PPCTEXT__	__attribute__ ((section(".text")))
  
  #elif defined(USE_HOSTCC) /* Native for 'tools/envcrc' */
  #  define __PPCENV__	/*XXX DO_NOT_DEL_THIS_COMMENT*/
  #  define __PPCTEXT__	/*XXX DO_NOT_DEL_THIS_COMMENT*/
  
  #else /* Environment is embedded in U-Boot's .text section */
  /* XXX - This only works with GNU C */
  #  define __PPCENV__	__attribute__ ((section(".text")))
  #  define __PPCTEXT__	__attribute__ ((section(".text")))
  #endif
  
  /*
   * Macros to generate global absolutes.
   */
  #if defined(__bfin__)
  # define GEN_SET_VALUE(name, value)	\
  	asm(".set " GEN_SYMNAME(name) ", " GEN_VALUE(value))
  #else
  # define GEN_SET_VALUE(name, value)	\
  	asm(GEN_SYMNAME(name) " = " GEN_VALUE(value))
  #endif
  #define GEN_SYMNAME(str)	SYM_CHAR #str
  #define GEN_VALUE(str)		#str
  #define GEN_ABS(name, value)			\
  	asm(".globl " GEN_SYMNAME(name));	\
  	GEN_SET_VALUE(name, value)
  
  /*
   * Check to see if we are building with a
   * computed CRC.  Otherwise define it as ~0.
   */
  #if !defined(ENV_CRC)
  #  define ENV_CRC	(~0)
  #endif
  
  #define DEFAULT_ENV_INSTANCE_EMBEDDED
  #include <env_default.h>
  
  #ifdef CONFIG_ENV_ADDR_REDUND
  env_t redundand_environment __PPCENV__ = {
  	0,		/* CRC Sum: invalid */
  	0,		/* Flags:   invalid */
  	{
  	"\0"
  	}
  };
  #endif	/* CONFIG_ENV_ADDR_REDUND */
  
  /*
   * These will end up in the .text section
   * if the environment strings are embedded
   * in the image.  When this is used for
   * tools/envcrc, they are placed in the
   * .data/.sdata section.
   *
   */
  unsigned long env_size __PPCTEXT__ = sizeof(env_t);
  
  /*
   * Add in absolutes.
   */
  GEN_ABS(env_offset, CONFIG_ENV_OFFSET);
  
  #endif /* ENV_IS_EMBEDDED */