common/env_common.c

   1 /*
   2  * (C) Copyright 2000-2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   6  * Andreas Heppel <aheppel@sysgo.de>
   7
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <environment.h>
  30 #include <linux/stddef.h>
  31 #include <malloc.h>
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 #ifdef CONFIG_AMIGAONEG3SE
  36         extern void enable_nvram(void);
  37         extern void disable_nvram(void);
  38 #endif
  39
  40 #undef DEBUG_ENV
  41 #ifdef DEBUG_ENV
  42 #define DEBUGF(fmt,args...) printf(fmt ,##args)
  43 #else
  44 #define DEBUGF(fmt,args...)
  45 #endif
  46
  47 extern env_t *env_ptr;
  48
  49 extern void env_relocate_spec (void);
  50 extern uchar env_get_char_spec(int);
  51
  52 static uchar env_get_char_init (int index);
  53
  54 /************************************************************************
  55  * Default settings to be used when no valid environment is found
  56  */
  57 #define XMK_STR(x)      #x
  58 #define MK_STR(x)       XMK_STR(x)
  59
  60 uchar default_environment[] = {
  61 #ifdef  CONFIG_BOOTARGS
  62         "bootargs="     CONFIG_BOOTARGS                 "\0"
  63 #endif
  64 #ifdef  CONFIG_BOOTCOMMAND
  65         "bootcmd="      CONFIG_BOOTCOMMAND              "\0"
  66 #endif
  67 #ifdef  CONFIG_RAMBOOTCOMMAND
  68         "ramboot="      CONFIG_RAMBOOTCOMMAND           "\0"
  69 #endif
  70 #ifdef  CONFIG_NFSBOOTCOMMAND
  71         "nfsboot="      CONFIG_NFSBOOTCOMMAND           "\0"
  72 #endif
  73 #if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
  74         "bootdelay="    MK_STR(CONFIG_BOOTDELAY)        "\0"
  75 #endif
  76 #if defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0)
  77         "baudrate="     MK_STR(CONFIG_BAUDRATE)         "\0"
  78 #endif
  79 #ifdef  CONFIG_LOADS_ECHO
  80         "loads_echo="   MK_STR(CONFIG_LOADS_ECHO)       "\0"
  81 #endif
  82 #ifdef  CONFIG_ETHADDR
  83         "ethaddr="      MK_STR(CONFIG_ETHADDR)          "\0"
  84 #endif
  85 #ifdef  CONFIG_ETH1ADDR
  86         "eth1addr="     MK_STR(CONFIG_ETH1ADDR)         "\0"
  87 #endif
  88 #ifdef  CONFIG_ETH2ADDR
  89         "eth2addr="     MK_STR(CONFIG_ETH2ADDR)         "\0"
  90 #endif
  91 #ifdef  CONFIG_ETH3ADDR
  92         "eth3addr="     MK_STR(CONFIG_ETH3ADDR)         "\0"
  93 #endif
  94 #ifdef  CONFIG_ETH4ADDR
  95         "eth4addr="     MK_STR(CONFIG_ETH4ADDR)         "\0"
  96 #endif
  97 #ifdef  CONFIG_ETH5ADDR
  98         "eth5addr="     MK_STR(CONFIG_ETH5ADDR)         "\0"
  99 #endif
 100 #ifdef  CONFIG_IPADDR
 101         "ipaddr="       MK_STR(CONFIG_IPADDR)           "\0"
 102 #endif
 103 #ifdef  CONFIG_SERVERIP
 104         "serverip="     MK_STR(CONFIG_SERVERIP)         "\0"
 105 #endif
 106 #ifdef  CONFIG_SYS_AUTOLOAD
 107         "autoload="     CONFIG_SYS_AUTOLOAD                     "\0"
 108 #endif
 109 #ifdef  CONFIG_PREBOOT
 110         "preboot="      CONFIG_PREBOOT                  "\0"
 111 #endif
 112 #ifdef  CONFIG_ROOTPATH
 113         "rootpath="     MK_STR(CONFIG_ROOTPATH)         "\0"
 114 #endif
 115 #ifdef  CONFIG_GATEWAYIP
 116         "gatewayip="    MK_STR(CONFIG_GATEWAYIP)        "\0"
 117 #endif
 118 #ifdef  CONFIG_NETMASK
 119         "netmask="      MK_STR(CONFIG_NETMASK)          "\0"
 120 #endif
 121 #ifdef  CONFIG_HOSTNAME
 122         "hostname="     MK_STR(CONFIG_HOSTNAME)         "\0"
 123 #endif
 124 #ifdef  CONFIG_BOOTFILE
 125         "bootfile="     MK_STR(CONFIG_BOOTFILE)         "\0"
 126 #endif
 127 #ifdef  CONFIG_LOADADDR
 128         "loadaddr="     MK_STR(CONFIG_LOADADDR)         "\0"
 129 #endif
 130 #ifdef  CONFIG_CLOCKS_IN_MHZ
 131         "clocks_in_mhz=1\0"
 132 #endif
 133 #if defined(CONFIG_PCI_BOOTDELAY) && (CONFIG_PCI_BOOTDELAY > 0)
 134         "pcidelay="     MK_STR(CONFIG_PCI_BOOTDELAY)    "\0"
 135 #endif
 136 #ifdef  CONFIG_EXTRA_ENV_SETTINGS
 137         CONFIG_EXTRA_ENV_SETTINGS
 138 #endif
 139         "\0"
 140 };
 141
 142 void env_crc_update (void)
 143 {
 144         env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
 145 }
 146
 147 static uchar env_get_char_init (int index)
 148 {
 149         uchar c;
 150
 151         /* if crc was bad, use the default environment */
 152         if (gd->env_valid)
 153         {
 154                 c = env_get_char_spec(index);
 155         } else {
 156                 c = default_environment[index];
 157         }
 158
 159         return (c);
 160 }
 161
 162 #ifdef CONFIG_AMIGAONEG3SE
 163 uchar env_get_char_memory (int index)
 164 {
 165         uchar retval;
 166         enable_nvram();
 167         if (gd->env_valid) {
 168                 retval = ( *((uchar *)(gd->env_addr + index)) );
 169         } else {
 170                 retval = ( default_environment[index] );
 171         }
 172         disable_nvram();
 173         return retval;
 174 }
 175 #else
 176 uchar env_get_char_memory (int index)
 177 {
 178         if (gd->env_valid) {
 179                 return ( *((uchar *)(gd->env_addr + index)) );
 180         } else {
 181                 return ( default_environment[index] );
 182         }
 183 }
 184 #endif
 185
 186 uchar env_get_char (int index)
 187 {
 188         uchar c;
 189
 190         /* if relocated to RAM */
 191         if (gd->flags & GD_FLG_RELOC)
 192                 c = env_get_char_memory(index);
 193         else
 194                 c = env_get_char_init(index);
 195
 196         return (c);
 197 }
 198
 199 uchar *env_get_addr (int index)
 200 {
 201         if (gd->env_valid) {
 202                 return ( ((uchar *)(gd->env_addr + index)) );
 203         } else {
 204                 return (&default_environment[index]);
 205         }
 206 }
 207
 208 void set_default_env(void)
 209 {
 210         if (sizeof(default_environment) > ENV_SIZE) {
 211                 puts ("*** Error - default environment is too large\n\n");
 212                 return;
 213         }
 214
 215         memset(env_ptr, 0, sizeof(env_t));
 216         memcpy(env_ptr->data, default_environment,
 217                sizeof(default_environment));
 218 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
 219         env_ptr->flags = 0xFF;
 220 #endif
 221         env_crc_update ();
 222         gd->env_valid = 1;
 223 }
 224
 225 void env_relocate (void)
 226 {
 227 #ifndef CONFIG_RELOC_FIXUP_WORKS
 228         DEBUGF ("%s[%d] offset = 0x%lx\n", __FUNCTION__,__LINE__,
 229                 gd->reloc_off);
 230 #endif
 231
 232 #ifdef CONFIG_AMIGAONEG3SE
 233         enable_nvram();
 234 #endif
 235
 236 #ifdef ENV_IS_EMBEDDED
 237         /*
 238          * The environment buffer is embedded with the text segment,
 239          * just relocate the environment pointer
 240          */
 241 #ifndef CONFIG_RELOC_FIXUP_WORKS
 242         env_ptr = (env_t *)((ulong)env_ptr + gd->reloc_off);
 243 #endif
 244         DEBUGF ("%s[%d] embedded ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
 245 #else
 246         /*
 247          * We must allocate a buffer for the environment
 248          */
 249         env_ptr = (env_t *)malloc (CONFIG_ENV_SIZE);
 250         DEBUGF ("%s[%d] malloced ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
 251 #endif
 252
 253         if (gd->env_valid == 0) {
 254 #if defined(CONFIG_GTH) || defined(CONFIG_ENV_IS_NOWHERE)       /* Environment not changable */
 255                 puts ("Using default environment\n\n");
 256 #else
 257                 puts ("*** Warning - bad CRC, using default environment\n\n");
 258                 show_boot_progress (-60);
 259 #endif
 260                 set_default_env();
 261         }
 262         else {
 263                 env_relocate_spec ();
 264         }
 265         gd->env_addr = (ulong)&(env_ptr->data);
 266
 267 #ifdef CONFIG_AMIGAONEG3SE
 268         disable_nvram();
 269 #endif
 270 }
 271
 272 #ifdef CONFIG_AUTO_COMPLETE
 273 int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf)
 274 {
 275         int i, nxt, len, vallen, found;
 276         const char *lval, *rval;
 277
 278         found = 0;
 279         cmdv[0] = NULL;
 280
 281         len = strlen(var);
 282         /* now iterate over the variables and select those that match */
 283         for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
 284
 285                 for (nxt=i; env_get_char(nxt) != '\0'; ++nxt)
 286                         ;
 287
 288                 lval = (char *)env_get_addr(i);
 289                 rval = strchr(lval, '=');
 290                 if (rval != NULL) {
 291                         vallen = rval - lval;
 292                         rval++;
 293                 } else
 294                         vallen = strlen(lval);
 295
 296                 if (len > 0 && (vallen < len || memcmp(lval, var, len) != 0))
 297                         continue;
 298
 299                 if (found >= maxv - 2 || bufsz < vallen + 1) {
 300                         cmdv[found++] = "...";
 301                         break;
 302                 }
 303                 cmdv[found++] = buf;
 304                 memcpy(buf, lval, vallen); buf += vallen; bufsz -= vallen;
 305                 *buf++ = '\0'; bufsz--;
 306         }
 307
 308         cmdv[found] = NULL;
 309         return found;
 310 }
 311 #endif