env_embedded.c 2.74 KB
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/*
 * (C) Copyright 2001
 * Erik Theisen,  Wave 7 Optics, etheisen@mindspring.com.
 *
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 * SPDX-License-Identifier:	GPL-2.0+
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 */

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#ifndef __ASSEMBLY__
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#define	__ASSEMBLY__			/* Dirty trick to get only #defines */
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#endif
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#define	__ASM_STUB_PROCESSOR_H__	/* don't include asm/processor. */
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#include <config.h>
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#undef	__ASSEMBLY__
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#include <environment.h>
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#include <linux/stringify.h>
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/* Handle HOSTS that have prepended crap on symbol names, not TARGETS. */
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#if defined(__APPLE__)
/* Leading underscore on symbols */
#  define SYM_CHAR "_"
#else /* No leading character on symbols */
#  define SYM_CHAR
#endif

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/*
 * Generate embedded environment table
 * inside U-Boot image, if needed.
 */
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#if defined(ENV_IS_EMBEDDED) || defined(CONFIG_BUILD_ENVCRC)
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/*
 * 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.
 */
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#if defined(CONFIG_SYS_USE_PPCENV) && \
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	defined(ENV_CRC) /* Environment embedded in U-Boot .ppcenv section */
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/* XXX - This only works with GNU C */
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#  define __PPCENV__	__attribute__ ((section(".ppcenv")))
#  define __PPCTEXT__	__attribute__ ((section(".text")))
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#elif defined(USE_HOSTCC) /* Native for 'tools/envcrc' */
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#  define __PPCENV__	/*XXX DO_NOT_DEL_THIS_COMMENT*/
#  define __PPCTEXT__	/*XXX DO_NOT_DEL_THIS_COMMENT*/
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#else /* Environment is embedded in U-Boot's .text section */
/* XXX - This only works with GNU C */
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#  define __PPCENV__	__attribute__ ((section(".text")))
#  define __PPCTEXT__	__attribute__ ((section(".text")))
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#endif

/*
 * Macros to generate global absolutes.
 */
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#if defined(__bfin__)
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# define GEN_SET_VALUE(name, value)	\
	asm(".set " GEN_SYMNAME(name) ", " GEN_VALUE(value))
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#else
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# 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)
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/*
 * Check to see if we are building with a
 * computed CRC.  Otherwise define it as ~0.
 */
#if !defined(ENV_CRC)
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#  define ENV_CRC	(~0)
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#endif

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#define DEFAULT_ENV_INSTANCE_EMBEDDED
#include <env_default.h>

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#ifdef CONFIG_ENV_ADDR_REDUND
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env_t redundand_environment __PPCENV__ = {
	0,		/* CRC Sum: invalid */
	0,		/* Flags:   invalid */
	{
	"\0"
	}
};
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#endif	/* CONFIG_ENV_ADDR_REDUND */
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/*
 * 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.
 */
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GEN_ABS(env_offset, CONFIG_ENV_OFFSET);
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#endif /* ENV_IS_EMBEDDED */