src/core/main.c

   1 /**************************************************************************
   2 Etherboot -  Network Bootstrap Program
   3
   4 Literature dealing with the network protocols:
   5         ARP - RFC826
   6         RARP - RFC903
   7         UDP - RFC768
   8         BOOTP - RFC951, RFC2132 (vendor extensions)
   9         DHCP - RFC2131, RFC2132 (options)
  10         TFTP - RFC1350, RFC2347 (options), RFC2348 (blocksize), RFC2349 (tsize)
  11         RPC - RFC1831, RFC1832 (XDR), RFC1833 (rpcbind/portmapper)
  12         NFS - RFC1094, RFC1813 (v3, useful for clarifications, not implemented)
  13         IGMP - RFC1112
  14
  15 **************************************************************************/
  16
  17 /* #define MDEBUG */
  18
  19 #include "etherboot.h"
  20 #include "dev.h"
  21 #include "nic.h"
  22 #include "disk.h"
  23 #include "timer.h"
  24 #include "cpu.h"
  25 #include "cmdline.h"
  26 #include "console.h"
  27 #include <gpxe/init.h>
  28 #include "image.h"
  29 #include <stdarg.h>
  30
  31 #include <gpxe/device.h>
  32 #include <gpxe/heap.h>
  33 #include <gpxe/netdevice.h>
  34
  35 /* Linker symbols */
  36 extern char _bss[], _ebss[];
  37
  38 jmp_buf restart_etherboot;
  39 int     url_port;
  40
  41 char as_main_program = 1;
  42
  43 #if 0
  44
  45 static inline unsigned long ask_boot(unsigned *index)
  46 {
  47         unsigned long order = DEFAULT_BOOT_ORDER;
  48         *index = DEFAULT_BOOT_INDEX;
  49 #ifdef LINUXBIOS
  50         order = get_boot_order(order, index);
  51 #endif
  52 #if defined(ASK_BOOT)
  53 #if ASK_BOOT >= 0
  54         while(1) {
  55                 int c = 0;
  56                 printf(ASK_PROMPT);
  57 #if ASK_BOOT > 0
  58                 {
  59                         unsigned long time;
  60                         for ( time = currticks() + ASK_BOOT*TICKS_PER_SEC;
  61                               !c && !iskey(); ) {
  62                                 if (currticks() > time) c = ANS_DEFAULT;
  63                         }
  64                 }
  65 #endif /* ASK_BOOT > 0 */
  66                 if ( !c ) c = getchar();
  67                 if ((c >= 'a') && (c <= 'z')) c &= 0x5F;
  68                 if ((c >= ' ') && (c <= '~')) putchar(c);
  69                 putchar('\n');
  70
  71                 switch(c) {
  72                 default:
  73                         /* Nothing useful try again */
  74                         continue;
  75                 case ANS_QUIT:
  76                         order = BOOT_NOTHING;
  77                         *index = 0;
  78                         break;
  79                 case ANS_DEFAULT:
  80                         /* Preserve the default boot order */
  81                         break;
  82                 case ANS_NETWORK:
  83                         order = (BOOT_NIC     << (0*BOOT_BITS)) |
  84                                 (BOOT_NOTHING << (1*BOOT_BITS));
  85                         *index = 0;
  86                         break;
  87                 case ANS_DISK:
  88                         order = (BOOT_DISK    << (0*BOOT_BITS)) |
  89                                 (BOOT_NOTHING << (1*BOOT_BITS));
  90                         *index = 0;
  91                         break;
  92                 case ANS_FLOPPY:
  93                         order = (BOOT_FLOPPY  << (0*BOOT_BITS)) |
  94                                 (BOOT_NOTHING << (1*BOOT_BITS));
  95                         *index = 0;
  96                         break;
  97                 }
  98                 break;
  99         }
 100         putchar('\n');
 101 #endif /* ASK_BOOT >= 0 */
 102 #endif /* defined(ASK_BOOT) */
 103         return order;
 104 }
 105
 106 static inline void try_floppy_first(void)
 107 {
 108 #if (TRY_FLOPPY_FIRST > 0)
 109         int i;
 110         printf("Trying floppy");
 111         disk_init();
 112         for (i = TRY_FLOPPY_FIRST; i-- > 0; ) {
 113                 putchar('.');
 114                 if (pcbios_disk_read(0, 0, 0, 0, ((char *)FLOPPY_BOOT_LOCATION)) != 0x8000) {
 115                         printf("using floppy\n");
 116                         exit(0);
 117                 }
 118         }
 119         printf("no floppy\n");
 120 #endif /* TRY_FLOPPY_FIRST */
 121 }
 122
 123 static struct class_operations {
 124         struct dev *dev;
 125         int (*probe)(struct dev *dev);
 126         int (*load_configuration)(struct dev *dev);
 127         int (*load)(struct dev *dev);
 128 }
 129 operations[] = {
 130         { &nic.dev,  eth_probe,  eth_load_configuration,  eth_load  },
 131         { &disk.dev, disk_probe, disk_load_configuration, disk_load },
 132         { &disk.dev, disk_probe, disk_load_configuration, disk_load },
 133 };
 134
 135 #endif
 136
 137 #if 0
 138 static int main_loop(int state);
 139 static int exit_ok;
 140 static int initialized;
 141 #endif
 142
 143 static int exit_status;
 144
 145 void test_dhcp ( struct net_device *netdev );
 146
 147 /**************************************************************************
 148 MAIN - Kick off routine
 149 **************************************************************************/
 150 int main ( void ) {
 151         struct net_device *netdev;
 152
 153         /* Call all registered initialisation functions */
 154         init_heap();
 155         call_init_fns ();
 156         probe_devices();
 157
 158         netdev = next_netdev ();
 159         if ( netdev ) {
 160                 cmdl_start();
 161                 test_dhcp ( netdev );
 162         } else {
 163                 printf ( "No network device found\n" );
 164         }
 165
 166         printf ( "Press any key to exit\n" );
 167         getchar();
 168
 169         remove_devices();
 170         call_exit_fns ();
 171
 172         return exit_status;
 173 }
 174
 175 #if 0
 176
 177 void exit(int status)
 178 {
 179         while(!exit_ok)
 180                 ;
 181         exit_status = status;
 182         longjmp(restart_etherboot, 255);
 183 }
 184
 185
 186
 187 static int main_loop(int state)
 188 {
 189         /* Splitting main into 2 pieces makes the semantics of
 190          * which variables are preserved across a longjmp clean
 191          * and predictable.
 192          */
 193         static unsigned long order;
 194         static unsigned boot_index;
 195         static struct dev * dev = 0;
 196         static struct class_operations *ops;
 197         static int type;
 198         static int i;
 199
 200         if (!initialized) {
 201                 initialized = 1;
 202                 if (dev && (state >= 1) && (state <= 2)) {
 203                         dev->how_probe = PROBE_AWAKE;
 204                         dev->how_probe = ops->probe(dev);
 205                         if (dev->how_probe == PROBE_FAILED) {
 206                                 state = -1;
 207                         }
 208                         if (state == 1) {
 209                                 /* The bootp reply might have been changed, re-parse.  */
 210                                 decode_rfc1533(bootp_data.bootp_reply.bp_vend, 0,
 211 #ifdef  NO_DHCP_SUPPORT
 212                                                BOOTP_VENDOR_LEN + MAX_BOOTP_EXTLEN,
 213 #else
 214                                                DHCP_OPT_LEN + MAX_BOOTP_EXTLEN,
 215 #endif  /* NO_DHCP_SUPPORT */
 216                                                1);
 217                         }
 218                 }
 219         }
 220         switch(state) {
 221         case 0:
 222         {
 223                 static int firsttime = 1;
 224                 /* First time through */
 225                 if (firsttime) {
 226                         cleanup();
 227                         firsttime = 0;
 228                 }
 229 #ifdef  EXIT_IF_NO_OFFER
 230                 else {
 231                         cleanup();
 232                         exit(0);
 233                 }
 234 #endif
 235                 i = -1;
 236                 state = 4;
 237                 dev = 0;
 238
 239                 /* We just called setjmp ... */
 240                 order = ask_boot(&boot_index);
 241                 try_floppy_first();
 242                 break;
 243         }
 244         case 4:
 245                 cleanup();
 246                 call_reset_fns();
 247                 /* Find a dev entry to probe with */
 248                 if (!dev) {
 249                         int boot;
 250                         int failsafe;
 251
 252                         /* Advance to the next device type */
 253                         i++;
 254                         boot = (order >> (i * BOOT_BITS)) & BOOT_MASK;
 255                         type = boot & BOOT_TYPE_MASK;
 256                         failsafe = (boot & BOOT_FAILSAFE) != 0;
 257                         if (i >= MAX_BOOT_ENTRIES) {
 258                                 type = BOOT_NOTHING;
 259                         }
 260                         if ((i == 0) && (type == BOOT_NOTHING)) {
 261                                 /* Return to caller */
 262                                 exit(0);
 263                         }
 264                         if (type >= BOOT_NOTHING) {
 265                                 interruptible_sleep(2);
 266                                 state = 0;
 267                                 break;
 268                         }
 269                         ops = &operations[type];
 270                         dev = ops->dev;
 271                         dev->how_probe = PROBE_FIRST;
 272                         dev->type = type;
 273                         dev->failsafe = failsafe;
 274                         dev->type_index = 0;
 275                 } else {
 276                         /* Advance to the next device of the same type */
 277                         dev->how_probe = PROBE_NEXT;
 278                 }
 279                 state = 3;
 280                 break;
 281         case 3:
 282                 state = -1;
 283                 /* Removed the following line because it was causing
 284                  * heap.o to be dragged in unnecessarily.  It's also
 285                  * slightly puzzling: by resetting heap_base, doesn't
 286                  * this mean that we permanently leak memory?
 287                  */
 288                 /* heap_base = allot(0); */
 289                 dev->how_probe = ops->probe(dev);
 290                 if (dev->how_probe == PROBE_FAILED) {
 291                         dev = 0;
 292                         state = 4;
 293                 } else if (boot_index && (i == 0) && (boot_index != (unsigned)dev->type_index)) {
 294                         printf("Wrong index\n");
 295                         state = 4;
 296                 }
 297                 else {
 298                         state = 2;
 299                 }
 300                 break;
 301         case 2:
 302                 state = -1;
 303                 if (ops->load_configuration(dev) >= 0) {
 304                         state = 1;
 305                 }
 306                 break;
 307         case 1:
 308                 /* Any return from load is a failure */
 309                 ops->load(dev);
 310                 state = -1;
 311                 break;
 312         case 256:
 313                 state = 0;
 314                 break;
 315         case -3:
 316                 i = MAX_BOOT_ENTRIES;
 317                 type = BOOT_NOTHING;
 318                 /* fall through */
 319         default:
 320                 printf("<abort>\n");
 321                 state = 4;
 322                 /* At the end goto state 0 */
 323                 if ((type >= BOOT_NOTHING) || (i >= MAX_BOOT_ENTRIES)) {
 324                         state = 0;
 325                 }
 326                 break;
 327         }
 328         return state;
 329 }
 330
 331
 332 #endif
 333
 334
 335 /**************************************************************************
 336 LOADKERNEL - Try to load kernel image
 337 **************************************************************************/
 338 #if 0
 339 /* To be split out into individual files */
 340 static const struct proto protos[] = {
 341         { "x-tftm", url_tftm },
 342         { "x-slam", url_slam },
 343         { "nfs", nfs },
 344         { "file", url_file },
 345         { "tftp", tftp },
 346         { "http", http },
 347 };
 348 #endif
 349
 350 /**************************************************************************
 351 CLEANUP - shut down networking and console so that the OS may be called
 352 **************************************************************************/
 353 #if 0
 354 void cleanup(void)
 355 {
 356         /* Stop receiving packets */
 357         disable ( &dev );
 358         initialized = 0;
 359 }
 360 #endif
 361
 362 /*
 363  * Local variables:
 364  *  c-basic-offset: 8
 365  * End:
 366  */