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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 <linux/string.h>

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

extern char boot_file[256];

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

extern char _end;
static char *src = 0;
static char *kern_src=0, *ird_src=0;
static int  header_size=0, kern_size=0, ird_size=0;

int
net_bread (int fd, long blkno, long nblks, char * buf)
{
      int nbytes;

#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
read_initrd()
{
      int nblocks, nread;

      /* put it as high up in memory as possible */
      initrd_start = free_mem_ptr - align_pagesize(ird_size);
      initrd_size = ird_size;
      /* update free_mem_ptr so malloc() still works */
      free_mem_ptr = initrd_start;
#ifdef DEBUG
      printf("memory_end %x %x\n", free_mem_ptr, initrd_start);
#endif

      nblocks = align_512(ird_size)/ 512;
      printf("aboot: loading initrd (%d bytes/%d blocks) at %#lx\n",
              ird_size, nblocks, initrd_start);
      nread = (*bfs->bread)(-1, 0, nblocks, (char*) initrd_start);
      return 0;
}



long
load_kernel (void)
{
      struct header *header;
      bfs = &netfs;

      header =  (struct header *)align_512( (unsigned long)&_end );
      header_size = header->header_size;
      kern_src = (char *)align_512((unsigned long)header + header_size);
      kern_size = header->kern_size;
      ird_src = (char *)align_512((unsigned long)kern_src + kern_size);
      ird_size = header->ird_size;

      if (!free_mem_ptr)
            free_mem_ptr = memory_end();
      free_mem_ptr = free_mem_ptr & ~(PAGE_SIZE-1);

#ifdef DEBUG
      printf("head %x %x kernel %x %x, initrd %x %x \n", header, header_size, kern_src, kern_size, ird_src, ird_size);
#endif

      if (ird_size) {
            src = ird_src;
            if (read_initrd() < 0) {
                  return -1;
            }
      }

      strcpy(boot_file, "network");

      //Move kernel to safe place before uncompression
      src = (char*)free_mem_ptr - align_pagesize(kern_size);
      free_mem_ptr = (unsigned long)src;
      memcpy(src, kern_src, kern_size);

      uncompress_kernel(-1);

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

      if (!kernel_args[0] && header->boot_arg[0]) { //have argument?
            strncpy(kernel_args, header->boot_arg, header_size - sizeof(int)*3);
      }

      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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