lib_ppc/ppc_linux.c

   1 /*
   2  * (C) Copyright 2008 Semihalf
   3  *
   4  * (C) Copyright 2000-2006
   5  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   6  *
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of
  13  * the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23  * MA 02111-1307 USA
  24  */
  25
  26 #define DEBUG
  27
  28 #include <common.h>
  29 #include <watchdog.h>
  30 #include <command.h>
  31 #include <image.h>
  32 #include <malloc.h>
  33 #include <zlib.h>
  34 #include <bzlib.h>
  35 #include <environment.h>
  36 #include <asm/byteorder.h>
  37
  38 #if defined(CONFIG_OF_LIBFDT)
  39 #include <fdt.h>
  40 #include <libfdt.h>
  41 #include <fdt_support.h>
  42 #elif defined(CONFIG_OF_FLAT_TREE)
  43 #include <ft_build.h>
  44 #endif
  45
  46 #ifdef CONFIG_LOGBUFFER
  47 #include <logbuff.h>
  48 #endif
  49
  50 #ifdef CFG_INIT_RAM_LOCK
  51 #include <asm/cache.h>
  52 #endif
  53
  54 DECLARE_GLOBAL_DATA_PTR;
  55
  56 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
  57
  58 #if defined(CONFIG_CMD_BDI)
  59 extern int do_bdinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
  60 #endif
  61
  62 void  __attribute__((noinline))
  63 do_bootm_linux(cmd_tbl_t *cmdtp, int flag,
  64                 int     argc, char *argv[],
  65                 image_header_t *hdr,
  66                 int     verify)
  67 {
  68         ulong   initrd_high;
  69         int     initrd_copy_to_ram = 1;
  70         ulong   initrd_start, initrd_end;
  71         ulong   rd_data, rd_len;
  72         image_header_t *rd_hdr;
  73
  74         ulong   cmd_start, cmd_end;
  75         char    *cmdline;
  76
  77         ulong   sp;
  78         char    *s;
  79         bd_t    *kbd;
  80         void    (*kernel)(bd_t *, ulong, ulong, ulong, ulong);
  81
  82 #if defined(CONFIG_OF_FLAT_TREE) || defined(CONFIG_OF_LIBFDT)
  83         image_header_t *fdt_hdr;
  84         char    *of_flat_tree = NULL;
  85         ulong   of_data = 0;
  86 #endif
  87
  88         if ((s = getenv ("initrd_high")) != NULL) {
  89                 /* a value of "no" or a similar string will act like 0,
  90                  * turning the "load high" feature off. This is intentional.
  91                  */
  92                 initrd_high = simple_strtoul(s, NULL, 16);
  93                 if (initrd_high == ~0)
  94                         initrd_copy_to_ram = 0;
  95         } else {        /* not set, no restrictions to load high */
  96                 initrd_high = ~0;
  97         }
  98
  99 #ifdef CONFIG_LOGBUFFER
 100         kbd=gd->bd;
 101         /* Prevent initrd from overwriting logbuffer */
 102         if (initrd_high < (kbd->bi_memsize-LOGBUFF_LEN-LOGBUFF_OVERHEAD))
 103                 initrd_high = kbd->bi_memsize-LOGBUFF_LEN-LOGBUFF_OVERHEAD;
 104         debug ("## Logbuffer at 0x%08lX ", kbd->bi_memsize-LOGBUFF_LEN);
 105 #endif
 106
 107         /*
 108          * Booting a (Linux) kernel image
 109          *
 110          * Allocate space for command line and board info - the
 111          * address should be as high as possible within the reach of
 112          * the kernel (see CFG_BOOTMAPSZ settings), but in unused
 113          * memory, which means far enough below the current stack
 114          * pointer.
 115          */
 116
 117         asm( "mr %0,1": "=r"(sp) : );
 118
 119         debug ("## Current stack ends at 0x%08lX ", sp);
 120
 121         sp -= 2048;             /* just to be sure */
 122         if (sp > CFG_BOOTMAPSZ)
 123                 sp = CFG_BOOTMAPSZ;
 124         sp &= ~0xF;
 125
 126         debug ("=> set upper limit to 0x%08lX\n", sp);
 127
 128         cmdline = (char *)((sp - CFG_BARGSIZE) & ~0xF);
 129         kbd = (bd_t *)(((ulong)cmdline - sizeof(bd_t)) & ~0xF);
 130
 131         if ((s = getenv("bootargs")) == NULL)
 132                 s = "";
 133
 134         strcpy (cmdline, s);
 135
 136         cmd_start    = (ulong)&cmdline[0];
 137         cmd_end      = cmd_start + strlen(cmdline);
 138
 139         *kbd = *(gd->bd);
 140
 141 #ifdef  DEBUG
 142         printf ("## cmdline at 0x%08lX ... 0x%08lX\n", cmd_start, cmd_end);
 143
 144 #if defined(CONFIG_CMD_BDI)
 145         do_bdinfo (NULL, 0, 0, NULL);
 146 #endif
 147 #endif
 148
 149         if ((s = getenv ("clocks_in_mhz")) != NULL) {
 150                 /* convert all clock information to MHz */
 151                 kbd->bi_intfreq /= 1000000L;
 152                 kbd->bi_busfreq /= 1000000L;
 153 #if defined(CONFIG_MPC8220)
 154         kbd->bi_inpfreq /= 1000000L;
 155         kbd->bi_pcifreq /= 1000000L;
 156         kbd->bi_pevfreq /= 1000000L;
 157         kbd->bi_flbfreq /= 1000000L;
 158         kbd->bi_vcofreq /= 1000000L;
 159 #endif
 160 #if defined(CONFIG_CPM2)
 161                 kbd->bi_cpmfreq /= 1000000L;
 162                 kbd->bi_brgfreq /= 1000000L;
 163                 kbd->bi_sccfreq /= 1000000L;
 164                 kbd->bi_vco     /= 1000000L;
 165 #endif
 166 #if defined(CONFIG_MPC5xxx)
 167                 kbd->bi_ipbfreq /= 1000000L;
 168                 kbd->bi_pcifreq /= 1000000L;
 169 #endif /* CONFIG_MPC5xxx */
 170         }
 171
 172         kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))image_get_ep (hdr);
 173
 174         /*
 175          * Check if there is an initrd image
 176          */
 177
 178 #if defined(CONFIG_OF_FLAT_TREE) || defined(CONFIG_OF_LIBFDT)
 179         /* Look for a '-' which indicates to ignore the ramdisk argument */
 180         if (argc >= 3 && strcmp(argv[2], "-") ==  0) {
 181                         debug ("Skipping initrd\n");
 182                         rd_len = rd_data = 0;
 183                 }
 184         else
 185 #endif
 186         if (argc >= 3) {
 187                 debug ("Not skipping initrd\n");
 188                 show_boot_progress (9);
 189
 190                 rd_hdr = (image_header_t *)simple_strtoul (argv[2], NULL, 16);
 191                 printf ("## Loading RAMDisk Image at %08lx ...\n", (ulong)rd_hdr);
 192
 193                 if (!image_check_magic (rd_hdr)) {
 194                         puts ("Bad Magic Number\n");
 195                         show_boot_progress (-10);
 196                         do_reset (cmdtp, flag, argc, argv);
 197                 }
 198
 199                 if (!image_check_hcrc (rd_hdr)) {
 200                         puts ("Bad Header Checksum\n");
 201                         show_boot_progress (-11);
 202                         do_reset (cmdtp, flag, argc, argv);
 203                 }
 204                 show_boot_progress (10);
 205
 206                 print_image_hdr (rd_hdr);
 207
 208                 if (verify) {
 209                         puts ("   Verifying Checksum ... ");
 210
 211                         if (!image_check_dcrc_wd (rd_hdr, CHUNKSZ)) {
 212                                 puts ("Bad Data CRC\n");
 213                                 show_boot_progress (-12);
 214                                 do_reset (cmdtp, flag, argc, argv);
 215                         }
 216                         puts ("OK\n");
 217                 }
 218
 219                 show_boot_progress (11);
 220
 221                 if (!image_check_os (rd_hdr, IH_OS_LINUX) ||
 222                     !image_check_arch (rd_hdr, IH_ARCH_PPC) ||
 223                     !image_check_type (rd_hdr, IH_TYPE_RAMDISK)) {
 224                         puts ("No Linux PPC Ramdisk Image\n");
 225                         show_boot_progress (-13);
 226                         do_reset (cmdtp, flag, argc, argv);
 227                 }
 228
 229                 rd_data = image_get_data (rd_hdr);
 230                 rd_len = image_get_data_size (rd_hdr);
 231
 232                 /*
 233                  * Now check if we have a multifile image
 234                  */
 235         } else if (image_check_type (hdr, IH_TYPE_MULTI)) {
 236                 /*
 237                  * Get second entry data start address and len
 238                  */
 239                 image_multi_getimg (hdr, 1, &rd_data, &rd_len);
 240                 show_boot_progress (13);
 241         } else {
 242                 /*
 243                  * No initrd image
 244                  */
 245                 show_boot_progress (14);
 246
 247                 rd_len = rd_data = 0;
 248         }
 249
 250 #if defined(CONFIG_OF_FLAT_TREE) || defined(CONFIG_OF_LIBFDT)
 251         if(argc > 3) {
 252                 of_flat_tree = (char *) simple_strtoul(argv[3], NULL, 16);
 253                 fdt_hdr = (image_header_t *)of_flat_tree;
 254 #if defined(CONFIG_OF_FLAT_TREE)
 255                 if (*((ulong *)(of_flat_tree)) == OF_DT_HEADER) {
 256 #elif defined(CONFIG_OF_LIBFDT)
 257                 if (fdt_check_header (of_flat_tree) == 0) {
 258 #endif
 259 #ifndef CFG_NO_FLASH
 260                         if (addr2info((ulong)of_flat_tree) != NULL)
 261                                 of_data = (ulong)of_flat_tree;
 262 #endif
 263                 } else if (image_check_magic (fdt_hdr)) {
 264                         ulong image_start, image_end;
 265                         ulong load_start, load_end;
 266
 267                         printf ("## Flat Device Tree at %08lX\n", fdt_hdr);
 268                         print_image_hdr (fdt_hdr);
 269
 270                         image_start = (ulong)fdt_hdr;
 271                         image_end = image_get_image_end (fdt_hdr);
 272
 273                         load_start = image_get_load (fdt_hdr);
 274                         load_end = load_start + image_get_data_size (fdt_hdr);
 275
 276                         if ((load_start < image_end) && (load_end > image_start)) {
 277                                 puts ("ERROR: fdt overwritten - "
 278                                         "must RESET the board to recover.\n");
 279                                 do_reset (cmdtp, flag, argc, argv);
 280                         }
 281
 282                         puts ("   Verifying Checksum ... ");
 283                         if (!image_check_hcrc (fdt_hdr)) {
 284                                 puts ("ERROR: fdt header checksum invalid - "
 285                                         "must RESET the board to recover.\n");
 286                                 do_reset (cmdtp, flag, argc, argv);
 287                         }
 288
 289                         if (!image_check_dcrc (fdt_hdr)) {
 290                                 puts ("ERROR: fdt checksum invalid - "
 291                                         "must RESET the board to recover.\n");
 292                                 do_reset (cmdtp, flag, argc, argv);
 293                         }
 294                         puts ("OK\n");
 295
 296                         if (!image_check_type (fdt_hdr, IH_TYPE_FLATDT)) {
 297                                 puts ("ERROR: uImage is not a fdt - "
 298                                         "must RESET the board to recover.\n");
 299                                 do_reset (cmdtp, flag, argc, argv);
 300                         }
 301                         if (image_get_comp (fdt_hdr) != IH_COMP_NONE) {
 302                                 puts ("ERROR: uImage is compressed - "
 303                                         "must RESET the board to recover.\n");
 304                                 do_reset (cmdtp, flag, argc, argv);
 305                         }
 306 #if defined(CONFIG_OF_FLAT_TREE)
 307                         if (*((ulong *)(of_flat_tree + image_get_header_size ())) != OF_DT_HEADER) {
 308 #elif defined(CONFIG_OF_LIBFDT)
 309                         if (fdt_check_header (of_flat_tree + image_get_header_size ()) != 0) {
 310 #endif
 311                                 puts ("ERROR: uImage data is not a fdt - "
 312                                         "must RESET the board to recover.\n");
 313                                 do_reset (cmdtp, flag, argc, argv);
 314                         }
 315
 316                         memmove ((void *)image_get_load (fdt_hdr),
 317                                 (void *)(of_flat_tree + image_get_header_size ()),
 318                                 image_get_data_size (fdt_hdr));
 319
 320                         of_flat_tree = (char *)image_get_load (fdt_hdr);
 321                 } else {
 322                         puts ("Did not find a flat Flat Device Tree.\n"
 323                                 "Must RESET the board to recover.\n");
 324                         do_reset (cmdtp, flag, argc, argv);
 325                 }
 326                 printf ("   Booting using the fdt at 0x%x\n",
 327                                 of_flat_tree);
 328         } else if (image_check_type (hdr, IH_TYPE_MULTI)) {
 329                 ulong fdt_data, fdt_len;
 330
 331                 image_multi_getimg (hdr, 2, &fdt_data, &fdt_len);
 332                 if (fdt_len) {
 333
 334                         of_flat_tree = (char *)fdt_data;
 335
 336 #ifndef CFG_NO_FLASH
 337                         /* move the blob if it is in flash (set of_data to !null) */
 338                         if (addr2info ((ulong)of_flat_tree) != NULL)
 339                                 of_data = (ulong)of_flat_tree;
 340 #endif
 341
 342 #if defined(CONFIG_OF_FLAT_TREE)
 343                         if (*((ulong *)(of_flat_tree)) != OF_DT_HEADER) {
 344 #elif defined(CONFIG_OF_LIBFDT)
 345                         if (fdt_check_header (of_flat_tree) != 0) {
 346 #endif
 347                                 puts ("ERROR: image is not a fdt - "
 348                                         "must RESET the board to recover.\n");
 349                                 do_reset (cmdtp, flag, argc, argv);
 350                         }
 351
 352 #if defined(CONFIG_OF_FLAT_TREE)
 353                         if (((struct boot_param_header *)of_flat_tree)->totalsize != fdt_len) {
 354 #elif defined(CONFIG_OF_LIBFDT)
 355                         if (be32_to_cpu (fdt_totalsize (of_flat_tree)) != fdt_len) {
 356 #endif
 357                                 puts ("ERROR: fdt size != image size - "
 358                                         "must RESET the board to recover.\n");
 359                                 do_reset (cmdtp, flag, argc, argv);
 360                         }
 361                 }
 362         }
 363 #endif
 364         if (!rd_data) {
 365                 debug ("No initrd\n");
 366         }
 367
 368         if (rd_data) {
 369             if (!initrd_copy_to_ram) {  /* zero-copy ramdisk support */
 370                 initrd_start = rd_data;
 371                 initrd_end = initrd_start + rd_len;
 372             } else {
 373                 initrd_start  = (ulong)kbd - rd_len;
 374                 initrd_start &= ~(4096 - 1);    /* align on page */
 375
 376                 if (initrd_high) {
 377                         ulong nsp;
 378
 379                         /*
 380                          * the inital ramdisk does not need to be within
 381                          * CFG_BOOTMAPSZ as it is not accessed until after
 382                          * the mm system is initialised.
 383                          *
 384                          * do the stack bottom calculation again and see if
 385                          * the initrd will fit just below the monitor stack
 386                          * bottom without overwriting the area allocated
 387                          * above for command line args and board info.
 388                          */
 389                         asm( "mr %0,1": "=r"(nsp) : );
 390                         nsp -= 2048;            /* just to be sure */
 391                         nsp &= ~0xF;
 392                         if (nsp > initrd_high)  /* limit as specified */
 393                                 nsp = initrd_high;
 394                         nsp -= rd_len;
 395                         nsp &= ~(4096 - 1);     /* align on page */
 396                         if (nsp >= sp)
 397                                 initrd_start = nsp;
 398                 }
 399
 400                 show_boot_progress (12);
 401
 402                 debug ("## initrd at 0x%08lX ... 0x%08lX (len=%ld=0x%lX)\n",
 403                         rd_data, rd_data + rd_len - 1, rd_len, rd_len);
 404
 405                 initrd_end    = initrd_start + rd_len;
 406                 printf ("   Loading Ramdisk to %08lx, end %08lx ... ",
 407                         initrd_start, initrd_end);
 408
 409                 memmove_wd((void *)initrd_start,
 410                            (void *)rd_data, rd_len, CHUNKSZ);
 411
 412                 puts ("OK\n");
 413             }
 414         } else {
 415                 initrd_start = 0;
 416                 initrd_end = 0;
 417         }
 418
 419 #if defined(CONFIG_OF_LIBFDT)
 420
 421 #ifdef CFG_BOOTMAPSZ
 422         /*
 423          * The blob must be within CFG_BOOTMAPSZ,
 424          * so we flag it to be copied if it is not.
 425          */
 426         if (of_flat_tree >= (char *)CFG_BOOTMAPSZ)
 427                 of_data = (ulong)of_flat_tree;
 428 #endif
 429
 430         /* move of_flat_tree if needed */
 431         if (of_data) {
 432                 int err;
 433                 ulong of_start, of_len;
 434
 435                 of_len = be32_to_cpu(fdt_totalsize(of_data));
 436
 437                 /* position on a 4K boundary before the kbd */
 438                 of_start  = (ulong)kbd - of_len;
 439                 of_start &= ~(4096 - 1);        /* align on page */
 440                 debug ("## device tree at 0x%08lX ... 0x%08lX (len=%ld=0x%lX)\n",
 441                         of_data, of_data + of_len - 1, of_len, of_len);
 442
 443                 of_flat_tree = (char *)of_start;
 444                 printf ("   Loading Device Tree to %08lx, end %08lx ... ",
 445                         of_start, of_start + of_len - 1);
 446                 err = fdt_open_into((void *)of_data, (void *)of_start, of_len);
 447                 if (err != 0) {
 448                         puts ("ERROR: fdt move failed - "
 449                                 "must RESET the board to recover.\n");
 450                         do_reset (cmdtp, flag, argc, argv);
 451                 }
 452                 puts ("OK\n");
 453         }
 454         /*
 455          * Add the chosen node if it doesn't exist, add the env and bd_t
 456          * if the user wants it (the logic is in the subroutines).
 457          */
 458         if (of_flat_tree) {
 459                 if (fdt_chosen(of_flat_tree, initrd_start, initrd_end, 0) < 0) {
 460                         puts ("ERROR: /chosen node create failed - "
 461                                 "must RESET the board to recover.\n");
 462                         do_reset (cmdtp, flag, argc, argv);
 463                 }
 464 #ifdef CONFIG_OF_HAS_UBOOT_ENV
 465                 if (fdt_env(of_flat_tree) < 0) {
 466                         puts ("ERROR: /u-boot-env node create failed - "
 467                                 "must RESET the board to recover.\n");
 468                         do_reset (cmdtp, flag, argc, argv);
 469                 }
 470 #endif
 471 #ifdef CONFIG_OF_HAS_BD_T
 472                 if (fdt_bd_t(of_flat_tree) < 0) {
 473                         puts ("ERROR: /bd_t node create failed - "
 474                                 "must RESET the board to recover.\n");
 475                         do_reset (cmdtp, flag, argc, argv);
 476                 }
 477 #endif
 478 #ifdef CONFIG_OF_BOARD_SETUP
 479                 /* Call the board-specific fixup routine */
 480                 ft_board_setup(of_flat_tree, gd->bd);
 481 #endif
 482         }
 483
 484 #elif defined(CONFIG_OF_FLAT_TREE)
 485
 486 #ifdef CFG_BOOTMAPSZ
 487         /*
 488          * The blob must be within CFG_BOOTMAPSZ,
 489          * so we flag it to be copied if it is not.
 490          */
 491         if (of_flat_tree >= (char *)CFG_BOOTMAPSZ)
 492                 of_data = (ulong)of_flat_tree;
 493 #endif
 494
 495         /* move of_flat_tree if needed */
 496         if (of_data) {
 497                 ulong of_start, of_len;
 498                 of_len = ((struct boot_param_header *)of_data)->totalsize;
 499
 500                 /* provide extra 8k pad */
 501                 of_start  = (ulong)kbd - of_len - 8192;
 502                 of_start &= ~(4096 - 1);        /* align on page */
 503                 debug ("## device tree at 0x%08lX ... 0x%08lX (len=%ld=0x%lX)\n",
 504                         of_data, of_data + of_len - 1, of_len, of_len);
 505
 506                 of_flat_tree = (char *)of_start;
 507                 printf ("   Loading Device Tree to %08lx, end %08lx ... ",
 508                         of_start, of_start + of_len - 1);
 509                 memmove ((void *)of_start, (void *)of_data, of_len);
 510                 puts ("OK\n");
 511         }
 512         /*
 513          * Create the /chosen node and modify the blob with board specific
 514          * values as needed.
 515          */
 516         ft_setup(of_flat_tree, kbd, initrd_start, initrd_end);
 517         /* ft_dump_blob(of_flat_tree); */
 518
 519 #endif  /* #if defined(CONFIG_OF_LIBFDT) #elif defined(CONFIG_OF_FLAT_TREE) */
 520
 521         debug ("## Transferring control to Linux (at address %08lx) ...\n",
 522                 (ulong)kernel);
 523
 524         show_boot_progress (15);
 525
 526 #if defined(CFG_INIT_RAM_LOCK) && !defined(CONFIG_E500)
 527         unlock_ram_in_cache();
 528 #endif
 529
 530 #if defined(CONFIG_OF_FLAT_TREE) || defined(CONFIG_OF_LIBFDT)
 531         if (of_flat_tree) {     /* device tree; boot new style */
 532                 /*
 533                  * Linux Kernel Parameters (passing device tree):
 534                  *   r3: pointer to the fdt, followed by the board info data
 535                  *   r4: physical pointer to the kernel itself
 536                  *   r5: NULL
 537                  *   r6: NULL
 538                  *   r7: NULL
 539                  */
 540                 (*kernel) ((bd_t *)of_flat_tree, (ulong)kernel, 0, 0, 0);
 541                 /* does not return */
 542         }
 543 #endif
 544         /*
 545          * Linux Kernel Parameters (passing board info data):
 546          *   r3: ptr to board info data
 547          *   r4: initrd_start or 0 if no initrd
 548          *   r5: initrd_end - unused if r4 is 0
 549          *   r6: Start of command line string
 550          *   r7: End   of command line string
 551          */
 552         (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
 553         /* does not return */
 554 }