lib_mips/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 <image.h>
  27 #include <zlib.h>
  28 #include <asm/byteorder.h>
  29 #include <asm/addrspace.h>
  30
  31 DECLARE_GLOBAL_DATA_PTR;
  32
  33 #define LINUX_MAX_ENVS          256
  34 #define LINUX_MAX_ARGS          256
  35
  36 static int      linux_argc;
  37 static char **  linux_argv;
  38
  39 static char **  linux_env;
  40 static char *   linux_env_p;
  41 static int      linux_env_idx;
  42
  43 static void linux_params_init (ulong start, char * commandline);
  44 static void linux_env_set (char * env_name, char * env_val);
  45
  46 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
  47
  48 void do_bootm_linux (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[],
  49                      bootm_headers_t *images)
  50 {
  51         ulong   initrd_start, initrd_end;
  52         ulong   ep = 0;
  53         void    (*theKernel) (int, char **, char **, int *);
  54         char    *commandline = getenv ("bootargs");
  55         char    env_buf[12];
  56         int     ret;
  57
  58         /* find kernel entry point */
  59         if (images->legacy_hdr_valid) {
  60                 ep = image_get_ep (images->legacy_hdr_os);
  61 #if defined(CONFIG_FIT)
  62         } else if (images->fit_uname_os) {
  63                 ret = fit_image_get_entry (images->fit_hdr_os,
  64                                 images->fit_noffset_os, &ep);
  65                 if (ret) {
  66                         puts ("Can't get entry point property!\n");
  67                         goto error;
  68                 }
  69 #endif
  70         } else {
  71                 puts ("Could not find kernel entry point!\n");
  72                 goto error;
  73         }
  74         theKernel = (void (*)(int, char **, char **, int *))ep;
  75
  76         ret = boot_get_ramdisk (argc, argv, images, IH_ARCH_MIPS,
  77                         &initrd_start, &initrd_end);
  78         if (ret)
  79                 goto error;
  80
  81         show_boot_progress (15);
  82
  83 #ifdef DEBUG
  84         printf ("## Transferring control to Linux (at address %08lx) ...\n",
  85                 (ulong) theKernel);
  86 #endif
  87
  88         linux_params_init (UNCACHED_SDRAM (gd->bd->bi_boot_params), commandline);
  89
  90 #ifdef CONFIG_MEMSIZE_IN_BYTES
  91         sprintf (env_buf, "%lu", gd->ram_size);
  92 #ifdef DEBUG
  93         printf ("## Giving linux memsize in bytes, %lu\n", gd->ram_size);
  94 #endif
  95 #else
  96         sprintf (env_buf, "%lu", gd->ram_size >> 20);
  97 #ifdef DEBUG
  98         printf ("## Giving linux memsize in MB, %lu\n", gd->ram_size >> 20);
  99 #endif
 100 #endif /* CONFIG_MEMSIZE_IN_BYTES */
 101
 102         linux_env_set ("memsize", env_buf);
 103
 104         sprintf (env_buf, "0x%08X", (uint) UNCACHED_SDRAM (initrd_start));
 105         linux_env_set ("initrd_start", env_buf);
 106
 107         sprintf (env_buf, "0x%X", (uint) (initrd_end - initrd_start));
 108         linux_env_set ("initrd_size", env_buf);
 109
 110         sprintf (env_buf, "0x%08X", (uint) (gd->bd->bi_flashstart));
 111         linux_env_set ("flash_start", env_buf);
 112
 113         sprintf (env_buf, "0x%X", (uint) (gd->bd->bi_flashsize));
 114         linux_env_set ("flash_size", env_buf);
 115
 116         if (!images->autostart)
 117                 return ;
 118
 119         /* we assume that the kernel is in place */
 120         printf ("\nStarting kernel ...\n\n");
 121
 122         theKernel (linux_argc, linux_argv, linux_env, 0);
 123         /* does not return */
 124         return;
 125
 126 error:
 127         if (images->autostart)
 128                 do_reset (cmdtp, flag, argc, argv);
 129         return;
 130 }
 131
 132 static void linux_params_init (ulong start, char *line)
 133 {
 134         char *next, *quote, *argp;
 135
 136         linux_argc = 1;
 137         linux_argv = (char **) start;
 138         linux_argv[0] = 0;
 139         argp = (char *) (linux_argv + LINUX_MAX_ARGS);
 140
 141         next = line;
 142
 143         while (line && *line && linux_argc < LINUX_MAX_ARGS) {
 144                 quote = strchr (line, '"');
 145                 next = strchr (line, ' ');
 146
 147                 while (next != NULL && quote != NULL && quote < next) {
 148                         /* we found a left quote before the next blank
 149                          * now we have to find the matching right quote
 150                          */
 151                         next = strchr (quote + 1, '"');
 152                         if (next != NULL) {
 153                                 quote = strchr (next + 1, '"');
 154                                 next = strchr (next + 1, ' ');
 155                         }
 156                 }
 157
 158                 if (next == NULL) {
 159                         next = line + strlen (line);
 160                 }
 161
 162                 linux_argv[linux_argc] = argp;
 163                 memcpy (argp, line, next - line);
 164                 argp[next - line] = 0;
 165
 166                 argp += next - line + 1;
 167                 linux_argc++;
 168
 169                 if (*next)
 170                         next++;
 171
 172                 line = next;
 173         }
 174
 175         linux_env = (char **) (((ulong) argp + 15) & ~15);
 176         linux_env[0] = 0;
 177         linux_env_p = (char *) (linux_env + LINUX_MAX_ENVS);
 178         linux_env_idx = 0;
 179 }
 180
 181 static void linux_env_set (char *env_name, char *env_val)
 182 {
 183         if (linux_env_idx < LINUX_MAX_ENVS - 1) {
 184                 linux_env[linux_env_idx] = linux_env_p;
 185
 186                 strcpy (linux_env_p, env_name);
 187                 linux_env_p += strlen (env_name);
 188
 189                 strcpy (linux_env_p, "=");
 190                 linux_env_p += 1;
 191
 192                 strcpy (linux_env_p, env_val);
 193                 linux_env_p += strlen (env_val);
 194
 195                 linux_env_p++;
 196                 linux_env[++linux_env_idx] = 0;
 197         }
 198 }