u-boot/common/env_embedded.c

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/*
* (C) Copyright 2001
* Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef __ASSEMBLY__
#define __ASSEMBLY__ /* Dirty trick to get only #defines */
#endif
#define __ASM_STUB_PROCESSOR_H__ /* don't include asm/processor. */
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#include <config.h>
#undef __ASSEMBLY__
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#include <environment.h>
#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
/*
* Generate embedded environment table
* inside U-Boot image, if needed.
*/
#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.
*/
#if (defined(CONFIG_SYS_USE_PPCENV) || defined(CONFIG_NAND_U_BOOT)) && \
defined(ENV_CRC) /* Environment embedded in U-Boot .ppcenv section */
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/* XXX - This only works with GNU C */
# define __PPCENV__ __attribute__ ((section(".ppcenv")))
# define __PPCTEXT__ __attribute__ ((section(".text")))
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#elif defined(USE_HOSTCC) /* Native for 'tools/envcrc' */
# 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 */
# define __PPCENV__ __attribute__ ((section(".text")))
# define __PPCTEXT__ __attribute__ ((section(".text")))
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#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)
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/*
* Check to see if we are building with a
* computed CRC. Otherwise define it as ~0.
*/
#if !defined(ENV_CRC)
# define ENV_CRC (~0)
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#endif
#define DEFAULT_ENV_INSTANCE_EMBEDDED
#include <env_default.h>
#ifdef CONFIG_ENV_ADDR_REDUND
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env_t redundand_environment __PPCENV__ = {
0, /* CRC Sum: invalid */
0, /* Flags: invalid */
{
"\0"
}
};
#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.
*/
GEN_ABS(env_offset, CONFIG_ENV_OFFSET);
#endif /* ENV_IS_EMBEDDED */