bootm.c 2.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
  4. */
  5. #include <common.h>
  6. #include <bootstage.h>
  7. #include <env.h>
  8. #include <image.h>
  9. #include <irq_func.h>
  10. #include <lmb.h>
  11. #include <asm/cache.h>
  12. DECLARE_GLOBAL_DATA_PTR;
  13. static ulong get_sp(void)
  14. {
  15. ulong ret;
  16. asm("mov %0, sp" : "=r"(ret) : );
  17. return ret;
  18. }
  19. void arch_lmb_reserve(struct lmb *lmb)
  20. {
  21. ulong sp;
  22. /*
  23. * Booting a (Linux) kernel image
  24. *
  25. * Allocate space for command line and board info - the
  26. * address should be as high as possible within the reach of
  27. * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  28. * memory, which means far enough below the current stack
  29. * pointer.
  30. */
  31. sp = get_sp();
  32. debug("## Current stack ends at 0x%08lx ", sp);
  33. /* adjust sp by 4K to be safe */
  34. sp -= 4096;
  35. lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
  36. }
  37. static int cleanup_before_linux(void)
  38. {
  39. disable_interrupts();
  40. sync_n_cleanup_cache_all();
  41. return 0;
  42. }
  43. __weak int board_prep_linux(bootm_headers_t *images) { return 0; }
  44. /* Subcommand: PREP */
  45. static int boot_prep_linux(bootm_headers_t *images)
  46. {
  47. int ret;
  48. ret = image_setup_linux(images);
  49. if (ret)
  50. return ret;
  51. return board_prep_linux(images);
  52. }
  53. /* Generic implementation for single core CPU */
  54. __weak void board_jump_and_run(ulong entry, int zero, int arch, uint params)
  55. {
  56. void (*kernel_entry)(int zero, int arch, uint params);
  57. kernel_entry = (void (*)(int, int, uint))entry;
  58. kernel_entry(zero, arch, params);
  59. }
  60. /* Subcommand: GO */
  61. static void boot_jump_linux(bootm_headers_t *images, int flag)
  62. {
  63. ulong kernel_entry;
  64. unsigned int r0, r2;
  65. int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
  66. kernel_entry = images->ep;
  67. debug("## Transferring control to Linux (at address %08lx)...\n",
  68. kernel_entry);
  69. bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  70. printf("\nStarting kernel ...%s\n\n", fake ?
  71. "(fake run for tracing)" : "");
  72. bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  73. if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
  74. r0 = 2;
  75. r2 = (unsigned int)images->ft_addr;
  76. } else {
  77. r0 = 1;
  78. r2 = (unsigned int)env_get("bootargs");
  79. }
  80. cleanup_before_linux();
  81. if (!fake)
  82. board_jump_and_run(kernel_entry, r0, 0, r2);
  83. }
  84. int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
  85. {
  86. /* No need for those on ARC */
  87. if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE))
  88. return -1;
  89. if (flag & BOOTM_STATE_OS_PREP)
  90. return boot_prep_linux(images);
  91. if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
  92. boot_jump_linux(images, flag);
  93. return 0;
  94. }
  95. return -1;
  96. }