/*
 * (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
 */

#include <config.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

/*
 * Check environment configuration and
 * setup the various values if necessary.
 */
#if defined(CFG_ENV_IS_IN_FLASH)
#  ifndef  CFG_ENV_ADDR
#    define CFG_ENV_ADDR	(CFG_FLASH_BASE + CFG_ENV_OFFSET)
#  endif
#  ifndef  CFG_ENV_OFFSET
#    define CFG_ENV_OFFSET	(CFG_ENV_ADDR - CFG_FLASH_BASE)
#  endif
#  ifndef  CFG_ENV_SIZE
#    define CFG_ENV_SIZE	CFG_ENV_SECT_SIZE
#  endif
#  if ((CFG_ENV_ADDR >= CFG_MONITOR_BASE) && \
	 ((CFG_ENV_ADDR+CFG_ENV_SIZE) <= (CFG_MONITOR_BASE + CFG_MONITOR_LEN)))
#    define ENV_IS_EMBEDDED
#  endif
#endif	/* CFG_ENV_IS_IN_FLASH */

/*
 * Generate embedded environment table
 * inside ppcboot image, if needed.
 */
#if defined(ENV_IS_EMBEDDED)

/*
 * Only put the environment in it's own section when we are building
 * PPCBoot proper.  The host based program "tools/envcrc" does not need
 * a seperate section.  Note that ENV_CRC is only defined when building
 * ppcboot itself.
 */
#if (defined(CONFIG_FADS) || \
     defined(CONFIG_HYMOD) || \
     defined(CONFIG_ICU862))	 && \
     defined(ENV_CRC) /* Environment embedded in ppcboot .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 ppcboot'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.
 */
#define GEN_SYMNAME(str) SYM_CHAR #str
#define GEN_VALUE(str) #str
#define GEN_ABS(name, value) \
		asm (".globl " GEN_SYMNAME(name)); \
		asm (GEN_SYMNAME(name) " = " GEN_VALUE(value))

/*
 * Macros to transform values
 * into environment strings.
 */
#define XMK_STR(x)	#x
#define MK_STR(x)	XMK_STR(x)

/*
 * 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

/*
 * Environment table.  This will end up
 * in one of a .ppcenv, .text, or .data section
 * depending on board or host configuration.
 *
 * XXX - This only works with GNU C.
 */
typedef struct environment_s {
	unsigned long crc;
	unsigned char data[CFG_ENV_SIZE - (sizeof(unsigned long))];
} env_t __attribute__ ((packed));

env_t environment __PPCENV__ = {
	ENV_CRC,
	{
#if defined(CONFIG_BOOTARGS)
	"bootargs="	CONFIG_BOOTARGS			"\0"
#endif
#if defined(CONFIG_BOOTCOMMAND)
	"bootcmd="	CONFIG_BOOTCOMMAND		"\0"
#endif
#if defined(CONFIG_RAMBOOTCOMMAND)
	"ramboot="	CONFIG_RAMBOOTCOMMAND		"\0"
#endif
#if defined(CONFIG_NFSBOOTCOMMAND)
	"nfsboot="	CONFIG_NFSBOOTCOMMAND		"\0"
#endif
#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
	"bootdelay="	MK_STR(CONFIG_BOOTDELAY)	"\0"
#endif
#if defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0)
	"baudrate="	MK_STR(CONFIG_BAUDRATE)		"\0"
#endif
#ifdef	CONFIG_LOADS_ECHO
	"loads_echo="	MK_STR(CONFIG_LOADS_ECHO)	"\0"
#endif
#ifdef	CONFIG_ETHADDR
	"ethaddr="	MK_STR(CONFIG_ETHADDR)		"\0"
#endif
#ifdef	CONFIG_ETH2ADDR
	"eth2addr="	MK_STR(CONFIG_ETH2ADDR)		"\0"
#endif
#ifdef	CONFIG_ETH3ADDR
	"eth3addr="	MK_STR(CONFIG_ETH3ADDR)		"\0"
#endif
#ifdef	CONFIG_IPADDR
	"ipaddr="	MK_STR(CONFIG_IPADDR)		"\0"
#endif
#ifdef	CONFIG_SERVERIP
	"serverip="	MK_STR(CONFIG_SERVERIP)		"\0"
#endif
#ifdef	CFG_AUTOLOAD
	"autoload="	CFG_AUTOLOAD			"\0"
#endif
#ifdef	CONFIG_ROOTPATH
	"rootpath="	MK_STR(CONFIG_ROOTPATH)		"\0"
#endif
#ifdef	CONFIG_GATEWAYIP
	"gatewayip="	MK_STR(CONFIG_GATEWAYIP)	"\0"
#endif
#ifdef	CONFIG_NETMASK
	"netmask="	MK_STR(CONFIG_NETMASK)		"\0"
#endif
#ifdef	CONFIG_HOSTNAME
	"hostname="	MK_STR(CONFIG_HOSTNAME)		"\0"
#endif
#ifdef	CONFIG_BOOTFILE
	"bootfile="	MK_STR(CONFIG_BOOTFILE)		"\0"
#endif
#ifdef	CONFIG_LOADADDR
	"loadaddr="	MK_STR(CONFIG_LOADADDR)		"\0"
#endif
#ifdef	CONFIG_PREBOOT
	"preboot="	CONFIG_PREBOOT			"\0"
#endif
#ifdef	CONFIG_CLOCKS_IN_MHZ
	"clocks_in_mhz=" "1"				"\0"
#endif
	"\0"		/* Term. env_t.data with 2 NULLs */
	}
};

/*
 * 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, CFG_ENV_OFFSET);

#endif /* ENV_IS_EMBEDDED */
