lib_sh/bootm.c

   1 /*
   2  * (C) Copyright 2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   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 <asm/byteorder.h>
  27
  28 /* The SH kernel reads arguments from the empty zero page at location
  29  * 0 at the start of SDRAM. The following are copied from
  30  * arch/sh/kernel/setup.c and may require tweaking if the kernel sources
  31  * change.
  32  */
  33 #define PARAM   ((unsigned char *)CFG_SDRAM_BASE + 0x1000)
  34
  35 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
  36 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
  37 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
  38 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
  39 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
  40 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
  41 /* ... */
  42 #define COMMAND_LINE ((char *) (PARAM+0x100))
  43
  44 #define RAMDISK_IMAGE_START_MASK        0x07FF
  45
  46 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
  47
  48 #ifdef CFG_DEBUG
  49 static void hexdump (unsigned char *buf, int len)
  50 {
  51         int i;
  52
  53         for (i = 0; i < len; i++) {
  54                 if ((i % 16) == 0)
  55                         printf ("%s%08x: ", i ? "\n" : "", (unsigned int) &buf[i]);
  56                 printf ("%02x ", buf[i]);
  57         }
  58         printf ("\n");
  59 }
  60 #endif
  61
  62 void do_bootm_linux (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
  63                      bootm_headers_t *images)
  64 {
  65         ulong   ep = 0;
  66         char    *bootargs = getenv("bootargs");
  67
  68         /* find kernel entry point */
  69         if (images->legacy_hdr_valid) {
  70                 ep = image_get_ep (images->legacy_hdr_os);
  71 #if defined(CONFIG_FIT)
  72         } else if (images->fit_uname_os) {
  73                 int ret = fit_image_get_entry (images->fit_hdr_os,
  74                                 images->fit_noffset_os, &ep);
  75                 if (ret) {
  76                         puts ("Can't get entry point property!\n");
  77                         goto error;
  78                 }
  79 #endif
  80         } else {
  81                 puts ("Could not find kernel entry point!\n");
  82                 goto error;
  83         }
  84         void (*kernel) (void) = (void (*)(void))ep;
  85
  86         if (!images->autostart)
  87                 return ;
  88
  89         /* Setup parameters */
  90         memset(PARAM, 0, 0x1000);       /* Clear zero page */
  91         strcpy(COMMAND_LINE, bootargs);
  92
  93         kernel();
  94         /* does not return */
  95         return;
  96
  97 error:
  98         if (images->autostart)
  99                 do_reset (cmdtp, flag, argc, argv);
 100         return;
 101 }