bootm.c 2.4 KB

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  1. /*
  2. * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
  3. * Scott McNutt <smcnutt@psyent.com>
  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
  9. * modify it under the terms of the GNU General Public License as
  10. * published by the Free Software Foundation; either version 2 of
  11. * the License, or (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,
  21. * MA 02111-1307 USA
  22. */
  23. #include <common.h>
  24. #include <command.h>
  25. #include <asm/byteorder.h>
  26. #include <asm/cache.h>
  27. #define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */
  28. int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
  29. {
  30. void (*kernel)(int, int, int, char *) = (void *)images->ep;
  31. char *commandline = getenv("bootargs");
  32. ulong initrd_start = images->rd_start;
  33. ulong initrd_end = images->rd_end;
  34. char *of_flat_tree = NULL;
  35. #if defined(CONFIG_OF_LIBFDT)
  36. ulong of_size = 0;
  37. /* find flattened device tree */
  38. if (boot_get_fdt(flag, argc, argv, images, &of_flat_tree, &of_size))
  39. return 1;
  40. #endif
  41. if (!of_flat_tree)
  42. of_flat_tree = (char *)simple_strtoul(argv[3], NULL, 16);
  43. if (of_flat_tree)
  44. initrd_end = (ulong)of_flat_tree;
  45. if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  46. return 1;
  47. /* flushes data and instruction caches before calling the kernel */
  48. disable_interrupts();
  49. flush_dcache((ulong)kernel, CONFIG_SYS_DCACHE_SIZE);
  50. flush_icache((ulong)kernel, CONFIG_SYS_ICACHE_SIZE);
  51. debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline);
  52. debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end);
  53. /* kernel parameters passing
  54. * r4 : NIOS magic
  55. * r5 : initrd start
  56. * r6 : initrd end or fdt
  57. * r7 : kernel command line
  58. * fdt is passed to kernel via r6, the same as initrd_end. fdt will be
  59. * verified with fdt magic. when both initrd and fdt are used at the
  60. * same time, fdt must follow immediately after initrd.
  61. */
  62. kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline);
  63. /* does not return */
  64. return 1;
  65. }