bootm.c 1.7 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
  4. * Scott McNutt <smcnutt@psyent.com>
  5. */
  6. #include <common.h>
  7. #include <cpu_func.h>
  8. #include <irq_func.h>
  9. #define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */
  10. int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
  11. {
  12. void (*kernel)(int, int, int, char *) = (void *)images->ep;
  13. char *commandline = env_get("bootargs");
  14. ulong initrd_start = images->rd_start;
  15. ulong initrd_end = images->rd_end;
  16. char *of_flat_tree = NULL;
  17. #if defined(CONFIG_OF_LIBFDT)
  18. /* did generic code already find a device tree? */
  19. if (images->ft_len)
  20. of_flat_tree = images->ft_addr;
  21. #endif
  22. if (!of_flat_tree && argc > 1)
  23. of_flat_tree = (char *)simple_strtoul(argv[1], NULL, 16);
  24. if (of_flat_tree)
  25. initrd_end = (ulong)of_flat_tree;
  26. /*
  27. * allow the PREP bootm subcommand, it is required for bootm to work
  28. */
  29. if (flag & BOOTM_STATE_OS_PREP)
  30. return 0;
  31. if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  32. return 1;
  33. /* flushes data and instruction caches before calling the kernel */
  34. disable_interrupts();
  35. flush_dcache_all();
  36. debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline);
  37. debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end);
  38. /* kernel parameters passing
  39. * r4 : NIOS magic
  40. * r5 : initrd start
  41. * r6 : initrd end or fdt
  42. * r7 : kernel command line
  43. * fdt is passed to kernel via r6, the same as initrd_end. fdt will be
  44. * verified with fdt magic. when both initrd and fdt are used at the
  45. * same time, fdt must follow immediately after initrd.
  46. */
  47. kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline);
  48. /* does not return */
  49. return 1;
  50. }