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