lib_mips/mips_linux.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 #define LINUX_MAX_ENVS          256
  32 #define LINUX_MAX_ARGS          256
  33
  34 #ifdef CONFIG_SHOW_BOOT_PROGRESS
  35 # include <status_led.h>
  36 # define SHOW_BOOT_PROGRESS(arg)        show_boot_progress(arg)
  37 #else
  38 # define SHOW_BOOT_PROGRESS(arg)
  39 #endif
  40
  41 extern image_header_t header;           /* from cmd_bootm.c */
  42
  43 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
  44
  45 static int      linux_argc;
  46 static char **  linux_argv;
  47
  48 static char **  linux_env;
  49 static char *   linux_env_p;
  50 static int      linux_env_idx;
  51
  52 static void linux_params_init (ulong start, char * commandline);
  53 static void linux_env_set (char * env_name, char * env_val);
  54
  55
  56 void do_bootm_linux (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[],
  57                      ulong addr, ulong * len_ptr, int verify)
  58 {
  59         DECLARE_GLOBAL_DATA_PTR;
  60
  61         ulong len = 0, checksum;
  62         ulong initrd_start, initrd_end;
  63         ulong data;
  64         void (*theKernel) (int, char **, char **, int *);
  65         image_header_t *hdr = &header;
  66         char *commandline = getenv ("bootargs");
  67         char env_buf[12];
  68
  69         theKernel =
  70                 (void (*)(int, char **, char **, int *)) ntohl (hdr->ih_ep);
  71
  72         /*
  73          * Check if there is an initrd image
  74          */
  75         if (argc >= 3) {
  76                 SHOW_BOOT_PROGRESS (9);
  77
  78                 addr = simple_strtoul (argv[2], NULL, 16);
  79
  80                 printf ("## Loading Ramdisk Image at %08lx ...\n", addr);
  81
  82                 /* Copy header so we can blank CRC field for re-calculation */
  83                 memcpy (&header, (char *) addr, sizeof (image_header_t));
  84
  85                 if (ntohl (hdr->ih_magic) != IH_MAGIC) {
  86                         printf ("Bad Magic Number\n");
  87                         SHOW_BOOT_PROGRESS (-10);
  88                         do_reset (cmdtp, flag, argc, argv);
  89                 }
  90
  91                 data = (ulong) & header;
  92                 len = sizeof (image_header_t);
  93
  94                 checksum = ntohl (hdr->ih_hcrc);
  95                 hdr->ih_hcrc = 0;
  96
  97                 if (crc32 (0, (uchar *) data, len) != checksum) {
  98                         printf ("Bad Header Checksum\n");
  99                         SHOW_BOOT_PROGRESS (-11);
 100                         do_reset (cmdtp, flag, argc, argv);
 101                 }
 102
 103                 SHOW_BOOT_PROGRESS (10);
 104
 105                 print_image_hdr (hdr);
 106
 107                 data = addr + sizeof (image_header_t);
 108                 len = ntohl (hdr->ih_size);
 109
 110                 if (verify) {
 111                         ulong csum = 0;
 112
 113                         printf ("   Verifying Checksum ... ");
 114                         csum = crc32 (0, (uchar *) data, len);
 115                         if (csum != ntohl (hdr->ih_dcrc)) {
 116                                 printf ("Bad Data CRC\n");
 117                                 SHOW_BOOT_PROGRESS (-12);
 118                                 do_reset (cmdtp, flag, argc, argv);
 119                         }
 120                         printf ("OK\n");
 121                 }
 122
 123                 SHOW_BOOT_PROGRESS (11);
 124
 125                 if ((hdr->ih_os != IH_OS_LINUX) ||
 126                     (hdr->ih_arch != IH_CPU_MIPS) ||
 127                     (hdr->ih_type != IH_TYPE_RAMDISK)) {
 128                         printf ("No Linux MIPS Ramdisk Image\n");
 129                         SHOW_BOOT_PROGRESS (-13);
 130                         do_reset (cmdtp, flag, argc, argv);
 131                 }
 132
 133                 /*
 134                  * Now check if we have a multifile image
 135                  */
 136         } else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
 137                 ulong tail = ntohl (len_ptr[0]) % 4;
 138                 int i;
 139
 140                 SHOW_BOOT_PROGRESS (13);
 141
 142                 /* skip kernel length and terminator */
 143                 data = (ulong) (&len_ptr[2]);
 144                 /* skip any additional image length fields */
 145                 for (i = 1; len_ptr[i]; ++i)
 146                         data += 4;
 147                 /* add kernel length, and align */
 148                 data += ntohl (len_ptr[0]);
 149                 if (tail) {
 150                         data += 4 - tail;
 151                 }
 152
 153                 len = ntohl (len_ptr[1]);
 154
 155         } else {
 156                 /*
 157                  * no initrd image
 158                  */
 159                 SHOW_BOOT_PROGRESS (14);
 160
 161                 data = 0;
 162         }
 163
 164 #ifdef  DEBUG
 165         if (!data) {
 166                 printf ("No initrd\n");
 167         }
 168 #endif
 169
 170         if (data) {
 171                 initrd_start = data;
 172                 initrd_end = initrd_start + len;
 173         } else {
 174                 initrd_start = 0;
 175                 initrd_end = 0;
 176         }
 177
 178         SHOW_BOOT_PROGRESS (15);
 179
 180 #ifdef DEBUG
 181         printf ("## Transferring control to Linux (at address %08lx) ...\n",
 182                 (ulong) theKernel);
 183 #endif
 184
 185         linux_params_init (UNCACHED_SDRAM (gd->bd->bi_boot_params), commandline);
 186
 187 #ifdef CONFIG_MEMSIZE_IN_BYTES
 188         sprintf (env_buf, "%lu", gd->ram_size);
 189 #ifdef DEBUG
 190         printf ("## Giving linux memsize in bytes, %lu\n", gd->ram_size);
 191 #endif
 192 #else
 193         sprintf (env_buf, "%lu", gd->ram_size >> 20);
 194 #ifdef DEBUG
 195         printf ("## Giving linux memsize in MB, %lu\n", gd->ram_size >> 20);
 196 #endif
 197 #endif /* CONFIG_MEMSIZE_IN_BYTES */
 198
 199         linux_env_set ("memsize", env_buf);
 200
 201         sprintf (env_buf, "0x%08X", (uint) UNCACHED_SDRAM (initrd_start));
 202         linux_env_set ("initrd_start", env_buf);
 203
 204         sprintf (env_buf, "0x%X", (uint) (initrd_end - initrd_start));
 205         linux_env_set ("initrd_size", env_buf);
 206
 207         sprintf (env_buf, "0x%08X", (uint) (gd->bd->bi_flashstart));
 208         linux_env_set ("flash_start", env_buf);
 209
 210         sprintf (env_buf, "0x%X", (uint) (gd->bd->bi_flashsize));
 211         linux_env_set ("flash_size", env_buf);
 212
 213         /* we assume that the kernel is in place */
 214         printf ("\nStarting kernel ...\n\n");
 215
 216         theKernel (linux_argc, linux_argv, linux_env, 0);
 217 }
 218
 219 static void linux_params_init (ulong start, char *line)
 220 {
 221         char *next, *quote, *argp;
 222
 223         linux_argc = 1;
 224         linux_argv = (char **) start;
 225         linux_argv[0] = 0;
 226         argp = (char *) (linux_argv + LINUX_MAX_ARGS);
 227
 228         next = line;
 229
 230         while (line && *line && linux_argc < LINUX_MAX_ARGS) {
 231                 quote = strchr (line, '"');
 232                 next = strchr (line, ' ');
 233
 234                 while (next != NULL && quote != NULL && quote < next) {
 235                         /* we found a left quote before the next blank
 236                          * now we have to find the matching right quote
 237                          */
 238                         next = strchr (quote + 1, '"');
 239                         if (next != NULL) {
 240                                 quote = strchr (next + 1, '"');
 241                                 next = strchr (next + 1, ' ');
 242                         }
 243                 }
 244
 245                 if (next == NULL) {
 246                         next = line + strlen (line);
 247                 }
 248
 249                 linux_argv[linux_argc] = argp;
 250                 memcpy (argp, line, next - line);
 251                 argp[next - line] = 0;
 252
 253                 argp += next - line + 1;
 254                 linux_argc++;
 255
 256                 if (*next)
 257                         next++;
 258
 259                 line = next;
 260         }
 261
 262         linux_env = (char **) (((ulong) argp + 15) & ~15);
 263         linux_env[0] = 0;
 264         linux_env_p = (char *) (linux_env + LINUX_MAX_ENVS);
 265         linux_env_idx = 0;
 266 }
 267
 268 static void linux_env_set (char *env_name, char *env_val)
 269 {
 270         if (linux_env_idx < LINUX_MAX_ENVS - 1) {
 271                 linux_env[linux_env_idx] = linux_env_p;
 272
 273                 strcpy (linux_env_p, env_name);
 274                 linux_env_p += strlen (env_name);
 275
 276                 strcpy (linux_env_p, "=");
 277                 linux_env_p += 1;
 278
 279                 strcpy (linux_env_p, env_val);
 280                 linux_env_p += strlen (env_val);
 281
 282                 linux_env_p++;
 283                 linux_env[++linux_env_idx] = 0;
 284         }
 285 }