lib_m68k/m68k_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 <bzlib.h>
  29 #include <watchdog.h>
  30 #include <environment.h>
  31 #include <asm/byteorder.h>
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 #define PHYSADDR(x) x
  36
  37 #define LINUX_MAX_ENVS          256
  38 #define LINUX_MAX_ARGS          256
  39
  40 #define CHUNKSZ                 (64 * 1024)
  41
  42 #ifdef CONFIG_SHOW_BOOT_PROGRESS
  43 # include <status_led.h>
  44 # define SHOW_BOOT_PROGRESS(arg)        show_boot_progress(arg)
  45 #else
  46 # define SHOW_BOOT_PROGRESS(arg)
  47 #endif
  48
  49 extern image_header_t header;
  50
  51 void do_bootm_linux(cmd_tbl_t * cmdtp, int flag,
  52                     int argc, char *argv[],
  53                     ulong addr, ulong * len_ptr, int verify)
  54 {
  55         ulong sp;
  56         ulong len, checksum;
  57         ulong initrd_start, initrd_end;
  58         ulong cmd_start, cmd_end;
  59         ulong initrd_high;
  60         ulong data;
  61         int initrd_copy_to_ram = 1;
  62         char *cmdline;
  63         char *s;
  64         bd_t *kbd;
  65         void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
  66         image_header_t *hdr = &header;
  67
  68         if ((s = getenv("initrd_high")) != NULL) {
  69                 /* a value of "no" or a similar string will act like 0,
  70                  * turning the "load high" feature off. This is intentional.
  71                  */
  72                 initrd_high = simple_strtoul(s, NULL, 16);
  73                 if (initrd_high == ~0)
  74                         initrd_copy_to_ram = 0;
  75         } else {                /* not set, no restrictions to load high */
  76                 initrd_high = ~0;
  77         }
  78
  79 #ifdef CONFIG_LOGBUFFER
  80         kbd = gd->bd;
  81         /* Prevent initrd from overwriting logbuffer */
  82         if (initrd_high < (kbd->bi_memsize - LOGBUFF_LEN - LOGBUFF_OVERHEAD))
  83                 initrd_high = kbd->bi_memsize - LOGBUFF_LEN - LOGBUFF_OVERHEAD;
  84         debug("## Logbuffer at 0x%08lX ", kbd->bi_memsize - LOGBUFF_LEN);
  85 #endif
  86
  87         /*
  88          * Booting a (Linux) kernel image
  89          *
  90          * Allocate space for command line and board info - the
  91          * address should be as high as possible within the reach of
  92          * the kernel (see CFG_BOOTMAPSZ settings), but in unused
  93          * memory, which means far enough below the current stack
  94          * pointer.
  95          */
  96         asm("movel %%a7, %%d0\n"
  97             "movel %%d0, %0\n": "=d"(sp): :"%d0");
  98
  99         debug("## Current stack ends at 0x%08lX ", sp);
 100
 101         sp -= 2048;             /* just to be sure */
 102         if (sp > CFG_BOOTMAPSZ)
 103                 sp = CFG_BOOTMAPSZ;
 104         sp &= ~0xF;
 105
 106         debug("=> set upper limit to 0x%08lX\n", sp);
 107
 108         cmdline = (char *)((sp - CFG_BARGSIZE) & ~0xF);
 109         kbd = (bd_t *) (((ulong) cmdline - sizeof(bd_t)) & ~0xF);
 110
 111         if ((s = getenv("bootargs")) == NULL)
 112                 s = "";
 113
 114         strcpy(cmdline, s);
 115
 116         cmd_start = (ulong) & cmdline[0];
 117         cmd_end = cmd_start + strlen(cmdline);
 118
 119         *kbd = *(gd->bd);
 120
 121 #ifdef  DEBUG
 122         printf("## cmdline at 0x%08lX ... 0x%08lX\n", cmd_start, cmd_end);
 123
 124         do_bdinfo(NULL, 0, 0, NULL);
 125 #endif
 126
 127         if ((s = getenv("clocks_in_mhz")) != NULL) {
 128                 /* convert all clock information to MHz */
 129                 kbd->bi_intfreq /= 1000000L;
 130                 kbd->bi_busfreq /= 1000000L;
 131         }
 132
 133         kernel =
 134             (void (*)(bd_t *, ulong, ulong, ulong, ulong))ntohl(hdr->ih_ep);
 135
 136         /*
 137          * Check if there is an initrd image
 138          */
 139
 140         if (argc >= 3) {
 141                 debug("Not skipping initrd\n");
 142                 SHOW_BOOT_PROGRESS(9);
 143
 144                 addr = simple_strtoul(argv[2], NULL, 16);
 145
 146                 printf("## Loading RAMDisk Image at %08lx ...\n", addr);
 147
 148                 /* Copy header so we can blank CRC field for re-calculation */
 149                 memmove(&header, (char *)addr, sizeof(image_header_t));
 150
 151                 if (ntohl(hdr->ih_magic) != IH_MAGIC) {
 152                         puts("Bad Magic Number\n");
 153                         SHOW_BOOT_PROGRESS(-10);
 154                         do_reset(cmdtp, flag, argc, argv);
 155                 }
 156
 157                 data = (ulong) & header;
 158                 len = sizeof(image_header_t);
 159
 160                 checksum = ntohl(hdr->ih_hcrc);
 161                 hdr->ih_hcrc = 0;
 162
 163                 if (crc32(0, (uchar *) data, len) != checksum) {
 164                         puts("Bad Header Checksum\n");
 165                         SHOW_BOOT_PROGRESS(-11);
 166                         do_reset(cmdtp, flag, argc, argv);
 167                 }
 168
 169                 SHOW_BOOT_PROGRESS(10);
 170
 171                 print_image_hdr(hdr);
 172
 173                 data = addr + sizeof(image_header_t);
 174                 len = ntohl(hdr->ih_size);
 175
 176                 if (verify) {
 177                         ulong csum = 0;
 178 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
 179                         ulong cdata = data, edata = cdata + len;
 180 #endif                          /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
 181
 182                         puts("   Verifying Checksum ... ");
 183
 184 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
 185
 186                         while (cdata < edata) {
 187                                 ulong chunk = edata - cdata;
 188
 189                                 if (chunk > CHUNKSZ)
 190                                         chunk = CHUNKSZ;
 191                                 csum = crc32(csum, (uchar *) cdata, chunk);
 192                                 cdata += chunk;
 193
 194                                 WATCHDOG_RESET();
 195                         }
 196 #else                           /* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
 197                         csum = crc32(0, (uchar *) data, len);
 198 #endif                          /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
 199
 200                         if (csum != ntohl(hdr->ih_dcrc)) {
 201                                 puts("Bad Data CRC\n");
 202                                 SHOW_BOOT_PROGRESS(-12);
 203                                 do_reset(cmdtp, flag, argc, argv);
 204                         }
 205                         puts("OK\n");
 206                 }
 207
 208                 SHOW_BOOT_PROGRESS(11);
 209
 210                 if ((hdr->ih_os != IH_OS_LINUX) ||
 211                     (hdr->ih_arch != IH_CPU_M68K) ||
 212                     (hdr->ih_type != IH_TYPE_RAMDISK)) {
 213                         puts("No Linux ColdFire Ramdisk Image\n");
 214                         SHOW_BOOT_PROGRESS(-13);
 215                         do_reset(cmdtp, flag, argc, argv);
 216                 }
 217
 218                 /*
 219                  * Now check if we have a multifile image
 220                  */
 221         } else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
 222                 u_long tail = ntohl(len_ptr[0]) % 4;
 223                 int i;
 224
 225                 SHOW_BOOT_PROGRESS(13);
 226
 227                 /* skip kernel length and terminator */
 228                 data = (ulong) (&len_ptr[2]);
 229                 /* skip any additional image length fields */
 230                 for (i = 1; len_ptr[i]; ++i)
 231                         data += 4;
 232                 /* add kernel length, and align */
 233                 data += ntohl(len_ptr[0]);
 234                 if (tail) {
 235                         data += 4 - tail;
 236                 }
 237
 238                 len = ntohl(len_ptr[1]);
 239
 240         } else {
 241                 /*
 242                  * no initrd image
 243                  */
 244                 SHOW_BOOT_PROGRESS(14);
 245
 246                 len = data = 0;
 247         }
 248
 249         if (!data) {
 250                 debug("No initrd\n");
 251         }
 252
 253         if (data) {
 254                 if (!initrd_copy_to_ram) {      /* zero-copy ramdisk support */
 255                         initrd_start = data;
 256                         initrd_end = initrd_start + len;
 257                 } else {
 258                         initrd_start = (ulong) kbd - len;
 259                         initrd_start &= ~(4096 - 1);    /* align on page */
 260
 261                         if (initrd_high) {
 262                                 ulong nsp;
 263
 264                                 /*
 265                                  * the inital ramdisk does not need to be within
 266                                  * CFG_BOOTMAPSZ as it is not accessed until after
 267                                  * the mm system is initialised.
 268                                  *
 269                                  * do the stack bottom calculation again and see if
 270                                  * the initrd will fit just below the monitor stack
 271                                  * bottom without overwriting the area allocated
 272                                  * above for command line args and board info.
 273                                  */
 274                                 asm("movel %%a7, %%d0\n"
 275                                     "movel %%d0, %0\n": "=d"(nsp): :"%d0");
 276
 277                                 nsp -= 2048;    /* just to be sure */
 278                                 nsp &= ~0xF;
 279
 280                                 if (nsp > initrd_high)  /* limit as specified */
 281                                         nsp = initrd_high;
 282
 283                                         nsp -= len;
 284                                 nsp &= ~(4096 - 1);     /* align on page */
 285
 286                                 if (nsp >= sp)
 287                                         initrd_start = nsp;
 288                         }
 289
 290                         SHOW_BOOT_PROGRESS(12);
 291
 292                         debug
 293                             ("## initrd at 0x%08lX ... 0x%08lX (len=%ld=0x%lX)\n",
 294                              data, data + len - 1, len, len);
 295
 296                         initrd_end = initrd_start + len;
 297                         printf("   Loading Ramdisk to %08lx, end %08lx ... ",
 298                                initrd_start, initrd_end);
 299 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
 300                         {
 301                                 size_t l = len;
 302                                 void *to = (void *)initrd_start;
 303                                 void *from = (void *)data;
 304
 305                                 while (l > 0) {
 306                                         size_t tail =
 307                                             (l > CHUNKSZ) ? CHUNKSZ : l;
 308                                         WATCHDOG_RESET();
 309                                         memmove(to, from, tail);
 310                                         to += tail;
 311                                         from += tail;
 312                                         l -= tail;
 313                                 }
 314                         }
 315 #else                           /* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
 316                         memmove((void *)initrd_start, (void *)data, len);
 317 #endif                          /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
 318                         puts("OK\n");
 319                 }
 320         } else {
 321                 initrd_start = 0;
 322                 initrd_end = 0;
 323         }
 324
 325         debug("## Transferring control to Linux (at address %08lx) ...\n",
 326               (ulong) kernel);
 327
 328         SHOW_BOOT_PROGRESS(15);
 329
 330         /*
 331          * Linux Kernel Parameters (passing board info data):
 332          *   r3: ptr to board info data
 333          *   r4: initrd_start or 0 if no initrd
 334          *   r5: initrd_end - unused if r4 is 0
 335          *   r6: Start of command line string
 336          *   r7: End   of command line string
 337          */
 338         (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
 339         /* does not return */
 340 }