common/environment.c

   1 /*
   2  * (C) Copyright 2001
   3  * Erik Theisen,  Wave 7 Optics, etheisen@mindspring.com.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <config.h>
  25 #include <environment.h>
  26
  27 /*
  28  * Handle HOSTS that have prepended
  29  * crap on symbol names, not TARGETS.
  30  */
  31 #if defined(__APPLE__)
  32 /* Leading underscore on symbols */
  33 #  define SYM_CHAR "_"
  34 #else /* No leading character on symbols */
  35 #  define SYM_CHAR
  36 #endif
  37
  38 /*
  39  * Generate embedded environment table
  40  * inside U-Boot image, if needed.
  41  */
  42 #if defined(ENV_IS_EMBEDDED)
  43 /*
  44  * Only put the environment in it's own section when we are building
  45  * U-Boot proper.  The host based program "tools/envcrc" does not need
  46  * a seperate section.  Note that ENV_CRC is only defined when building
  47  * U-Boot itself.
  48  */
  49 #if (defined(CONFIG_CMI)        || \
  50      defined(CONFIG_FADS)       || \
  51      defined(CONFIG_HYMOD)      || \
  52      defined(CONFIG_ICU862)     || \
  53      defined(CONFIG_R360MPI)    || \
  54      defined(CONFIG_TQM8xxL)    || \
  55      defined(CONFIG_RRVISION)   || \
  56      defined(CONFIG_TRAB)   )   && \
  57      defined(ENV_CRC) /* Environment embedded in U-Boot .ppcenv section */
  58 /* XXX - This only works with GNU C */
  59 #  define __PPCENV__ __attribute__ ((section(".ppcenv")))
  60 #  define __PPCTEXT__ __attribute__ ((section(".text")))
  61
  62 #elif defined(USE_HOSTCC) /* Native for 'tools/envcrc' */
  63 #  define __PPCENV__ /*XXX DO_NOT_DEL_THIS_COMMENT*/
  64 #  define __PPCTEXT__ /*XXX DO_NOT_DEL_THIS_COMMENT*/
  65
  66 #else /* Environment is embedded in U-Boot's .text section */
  67 /* XXX - This only works with GNU C */
  68 #  define __PPCENV__ __attribute__ ((section(".text")))
  69 #  define __PPCTEXT__ __attribute__ ((section(".text")))
  70 #endif
  71
  72 /*
  73  * Macros to generate global absolutes.
  74  */
  75 #define GEN_SYMNAME(str) SYM_CHAR #str
  76 #define GEN_VALUE(str) #str
  77 #define GEN_ABS(name, value) \
  78                 asm (".globl " GEN_SYMNAME(name)); \
  79                 asm (GEN_SYMNAME(name) " = " GEN_VALUE(value))
  80
  81 /*
  82  * Macros to transform values
  83  * into environment strings.
  84  */
  85 #define XMK_STR(x)      #x
  86 #define MK_STR(x)       XMK_STR(x)
  87
  88 /*
  89  * Check to see if we are building with a
  90  * computed CRC.  Otherwise define it as ~0.
  91  */
  92 #if !defined(ENV_CRC)
  93 #  define ENV_CRC       ~0
  94 #endif
  95
  96 env_t environment __PPCENV__ = {
  97         ENV_CRC,        /* CRC Sum */
  98 #ifdef CFG_REDUNDAND_ENVIRONMENT
  99         1,              /* Flags: valid */
 100 #endif
 101         {
 102 #if defined(CONFIG_BOOTARGS)
 103         "bootargs="     CONFIG_BOOTARGS                 "\0"
 104 #endif
 105 #if defined(CONFIG_BOOTCOMMAND)
 106         "bootcmd="      CONFIG_BOOTCOMMAND              "\0"
 107 #endif
 108 #if defined(CONFIG_RAMBOOTCOMMAND)
 109         "ramboot="      CONFIG_RAMBOOTCOMMAND           "\0"
 110 #endif
 111 #if defined(CONFIG_NFSBOOTCOMMAND)
 112         "nfsboot="      CONFIG_NFSBOOTCOMMAND           "\0"
 113 #endif
 114 #if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
 115         "bootdelay="    MK_STR(CONFIG_BOOTDELAY)        "\0"
 116 #endif
 117 #if defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0)
 118         "baudrate="     MK_STR(CONFIG_BAUDRATE)         "\0"
 119 #endif
 120 #ifdef  CONFIG_LOADS_ECHO
 121         "loads_echo="   MK_STR(CONFIG_LOADS_ECHO)       "\0"
 122 #endif
 123 #ifdef  CONFIG_ETHADDR
 124         "ethaddr="      MK_STR(CONFIG_ETHADDR)          "\0"
 125 #endif
 126 #ifdef  CONFIG_ETH1ADDR
 127         "eth1addr="     MK_STR(CONFIG_ETH1ADDR)         "\0"
 128 #endif
 129 #ifdef  CONFIG_ETH2ADDR
 130         "eth2addr="     MK_STR(CONFIG_ETH2ADDR)         "\0"
 131 #endif
 132 #ifdef  CONFIG_ETHPRIME
 133         "ethprime="     CONFIG_ETHPRIME                 "\0"
 134 #endif
 135 #ifdef  CONFIG_IPADDR
 136         "ipaddr="       MK_STR(CONFIG_IPADDR)           "\0"
 137 #endif
 138 #ifdef  CONFIG_SERVERIP
 139         "serverip="     MK_STR(CONFIG_SERVERIP)         "\0"
 140 #endif
 141 #ifdef  CFG_AUTOLOAD
 142         "autoload="     CFG_AUTOLOAD                    "\0"
 143 #endif
 144 #ifdef  CONFIG_ROOTPATH
 145         "rootpath="     MK_STR(CONFIG_ROOTPATH)         "\0"
 146 #endif
 147 #ifdef  CONFIG_GATEWAYIP
 148         "gatewayip="    MK_STR(CONFIG_GATEWAYIP)        "\0"
 149 #endif
 150 #ifdef  CONFIG_NETMASK
 151         "netmask="      MK_STR(CONFIG_NETMASK)          "\0"
 152 #endif
 153 #ifdef  CONFIG_HOSTNAME
 154         "hostname="     MK_STR(CONFIG_HOSTNAME)         "\0"
 155 #endif
 156 #ifdef  CONFIG_BOOTFILE
 157         "bootfile="     MK_STR(CONFIG_BOOTFILE)         "\0"
 158 #endif
 159 #ifdef  CONFIG_LOADADDR
 160         "loadaddr="     MK_STR(CONFIG_LOADADDR)         "\0"
 161 #endif
 162 #ifdef  CONFIG_PREBOOT
 163         "preboot="      CONFIG_PREBOOT                  "\0"
 164 #endif
 165 #ifdef  CONFIG_CLOCKS_IN_MHZ
 166         "clocks_in_mhz=" "1"                            "\0"
 167 #endif
 168 #if defined(CONFIG_PCI_BOOTDELAY) && (CONFIG_PCI_BOOTDELAY > 0)
 169         "pcidelay="     MK_STR(CONFIG_PCI_BOOTDELAY)    "\0"
 170 #endif
 171 #ifdef  CONFIG_EXTRA_ENV_SETTINGS
 172         CONFIG_EXTRA_ENV_SETTINGS
 173 #endif
 174         "\0"            /* Term. env_t.data with 2 NULs */
 175         }
 176 };
 177 #ifdef CFG_ENV_ADDR_REDUND
 178 env_t redundand_environment __PPCENV__ = {
 179         0,              /* CRC Sum: invalid */
 180         0,              /* Flags:   invalid */
 181         {
 182         "\0"
 183         }
 184 };
 185 #endif  /* CFG_ENV_ADDR_REDUND */
 186
 187 /*
 188  * These will end up in the .text section
 189  * if the environment strings are embedded
 190  * in the image.  When this is used for
 191  * tools/envcrc, they are placed in the
 192  * .data/.sdata section.
 193  *
 194  */
 195 unsigned long env_size __PPCTEXT__ = sizeof(env_t);
 196
 197 /*
 198  * Add in absolutes.
 199  */
 200 GEN_ABS(env_offset, CFG_ENV_OFFSET);
 201
 202 #endif /* ENV_IS_EMBEDDED */