lib_i386/i386_linux.c

   1 /*
   2  * (C) Copyright 2002
   3  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4  * Marius Groeger <mgroeger@sysgo.de>
   5  *
   6  * Copyright (C) 2001  Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <common.h>
  25 #include <command.h>
  26 #include <image.h>
  27 #include <zlib.h>
  28 #include <asm/byteorder.h>
  29 #include <asm/zimage.h>
  30
  31 /*cmd_boot.c*/
  32 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
  33
  34 extern image_header_t header;           /* from cmd_bootm.c */
  35
  36
  37 image_header_t *fake_header(image_header_t *hdr, void *ptr, int size)
  38 {
  39         /* try each supported image type in order */
  40         if (NULL != fake_zimage_header(hdr, ptr, size)) {
  41                 return hdr;
  42         }
  43
  44         return NULL;
  45 }
  46
  47
  48 void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
  49                 ulong addr, ulong *len_ptr, int   verify)
  50 {
  51         void *base_ptr;
  52
  53         ulong len = 0, checksum;
  54         ulong initrd_start, initrd_end;
  55         ulong data;
  56         image_header_t *hdr = &header;
  57
  58         /*
  59          * Check if there is an initrd image
  60          */
  61         if (argc >= 3) {
  62                 addr = simple_strtoul(argv[2], NULL, 16);
  63
  64                 printf ("## Loading Ramdisk Image at %08lx ...\n", addr);
  65
  66                 /* Copy header so we can blank CRC field for re-calculation */
  67                 memcpy (&header, (char *)addr, sizeof(image_header_t));
  68
  69                 if (ntohl(hdr->ih_magic) != IH_MAGIC) {
  70                         printf ("Bad Magic Number\n");
  71                         do_reset (cmdtp, flag, argc, argv);
  72                 }
  73
  74                 data = (ulong)&header;
  75                 len  = sizeof(image_header_t);
  76
  77                 checksum = ntohl(hdr->ih_hcrc);
  78                 hdr->ih_hcrc = 0;
  79
  80                 if (crc32 (0, (char *)data, len) != checksum) {
  81                         printf ("Bad Header Checksum\n");
  82                         do_reset (cmdtp, flag, argc, argv);
  83                 }
  84
  85                 print_image_hdr (hdr);
  86
  87                 data = addr + sizeof(image_header_t);
  88                 len  = ntohl(hdr->ih_size);
  89
  90                 if (verify) {
  91                         ulong csum = 0;
  92
  93                         printf ("   Verifying Checksum ... ");
  94                         csum = crc32 (0, (char *)data, len);
  95                         if (csum != ntohl(hdr->ih_dcrc)) {
  96                                 printf ("Bad Data CRC\n");
  97                                 do_reset (cmdtp, flag, argc, argv);
  98                         }
  99                         printf ("OK\n");
 100                 }
 101
 102                 if ((hdr->ih_os   != IH_OS_LINUX)       ||
 103                     (hdr->ih_arch != IH_CPU_I386)       ||
 104                     (hdr->ih_type != IH_TYPE_RAMDISK)   ) {
 105                         printf ("No Linux i386 Ramdisk Image\n");
 106                         do_reset (cmdtp, flag, argc, argv);
 107                 }
 108
 109                 /*
 110                  * Now check if we have a multifile image
 111                  */
 112         } else if ((hdr->ih_type==IH_TYPE_MULTI) && (len_ptr[1])) {
 113                 ulong tail    = ntohl(len_ptr[0]) % 4;
 114                 int i;
 115
 116                 /* skip kernel length and terminator */
 117                 data = (ulong)(&len_ptr[2]);
 118                 /* skip any additional image length fields */
 119                 for (i=1; len_ptr[i]; ++i)
 120                         data += 4;
 121                 /* add kernel length, and align */
 122                 data += ntohl(len_ptr[0]);
 123                 if (tail) {
 124                         data += 4 - tail;
 125                 }
 126
 127                 len   = ntohl(len_ptr[1]);
 128
 129         } else {
 130                 /*
 131                  * no initrd image
 132                  */
 133                 data = 0;
 134         }
 135
 136 #ifdef  DEBUG
 137         if (!data) {
 138                 printf ("No initrd\n");
 139         }
 140 #endif
 141
 142         if (data) {
 143                 initrd_start = data;
 144                 initrd_end   = initrd_start + len;
 145                 printf ("   Loading Ramdisk to %08lx, end %08lx ... ",
 146                         initrd_start, initrd_end);
 147                 memmove ((void *)initrd_start, (void *)data, len);
 148                 printf ("OK\n");
 149         } else {
 150                 initrd_start = 0;
 151                 initrd_end = 0;
 152         }
 153
 154         /* if multi-part image, we need to advance base ptr */
 155         if ((hdr->ih_type==IH_TYPE_MULTI) && (len_ptr[1])) {
 156                 int i;
 157                 for (i=0, addr+=sizeof(int); len_ptr[i++]; addr+=sizeof(int));
 158         }
 159
 160         base_ptr = load_zimage((void*)addr + sizeof(image_header_t), ntohl(hdr->ih_size),
 161                                initrd_start, initrd_end-initrd_start, 0);
 162
 163         if (NULL == base_ptr) {
 164                 printf ("## Kernel loading failed ...\n");
 165                 do_reset(cmdtp, flag, argc, argv);
 166
 167         }
 168
 169 #ifdef DEBUG
 170         printf ("## Transferring control to Linux (at address %08x) ...\n",
 171                 (u32)base_ptr);
 172 #endif
 173
 174         /* we assume that the kernel is in place */
 175         printf("\nStarting kernel ...\n\n");
 176
 177         boot_zimage(base_ptr);
 178
 179 }