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net.c

/*
 * net.c
 *
 * This file is part of aboot, the SRM bootloader for Linux/Alpha
 * Copyright (C) 1996 Dave Larson, and David Mosberger.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <asm/console.h>
#include <asm/system.h>

#include "config.h"
#include "cons.h"
#include "aboot.h"
#include "bootfs.h"
#include "utils.h"
#include "string.h"

extern char boot_file[256];

void
dang (void)
{
      printf("aboot: oops, unimplemented net-bfs function called!\n");
}


int
net_bread (int fd, long blkno, long nblks, char * buf)
{
        static char * src = 0;
      extern char _end;
      int nbytes;

      if (!src)
            src = (char *) (((unsigned long) &_end + 511) & ~511);

#ifdef DEBUG
      printf("net_bread: %p -> %p (%ld blocks at %ld)\n", src, buf,
             nblks, blkno);
#endif
      nbytes = bfs->blocksize * nblks;

        memcpy(buf, src, nbytes);
        src += nbytes;

        return nbytes;
}


struct bootfs netfs = {
      -1, 512,
      (int (*)(long, long, long))   dang, /* mount */
      (int (*)(const char *))       dang, /* open */
      net_bread,                    /* bread */
      (void (*)(int fd))            dang, /* close */
      (const char* (*)(int, int))   dang, /* readdir */
      (int (*)(int, struct stat*))  dang, /* fstat */
};


long
load_kernel (void)
{
      bfs = &netfs;

      strcpy(boot_file, "network");
      uncompress_kernel(-1);

      memset((char*)bss_start, 0, bss_size);            /* clear bss */

      while (kernel_args[0] == 'i' && !kernel_args[1]) {
          printf("Enter kernel arguments:\n");
          printf("aboot> ");
          getline(kernel_args, sizeof(kernel_args));
          printf("\n");
      }
      return 0;
}

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