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 <log.h>
  12. #include <asm/cache.h>
  13. DECLARE_GLOBAL_DATA_PTR;
  14. static ulong get_sp(void)
  15. {
  16. ulong ret;
  17. asm("mov %0, sp" : "=r"(ret) : );
  18. return ret;
  19. }
  20. void arch_lmb_reserve(struct lmb *lmb)
  21. {
  22. ulong sp;
  23. /*
  24. * Booting a (Linux) kernel image
  25. *
  26. * Allocate space for command line and board info - the
  27. * address should be as high as possible within the reach of
  28. * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  29. * memory, which means far enough below the current stack
  30. * pointer.
  31. */
  32. sp = get_sp();
  33. debug("## Current stack ends at 0x%08lx ", sp);
  34. /* adjust sp by 4K to be safe */
  35. sp -= 4096;
  36. lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
  37. }
  38. static int cleanup_before_linux(void)
  39. {
  40. disable_interrupts();
  41. sync_n_cleanup_cache_all();
  42. return 0;
  43. }
  44. __weak int board_prep_linux(bootm_headers_t *images) { return 0; }
  45. /* Subcommand: PREP */
  46. static int boot_prep_linux(bootm_headers_t *images)
  47. {
  48. int ret;
  49. ret = image_setup_linux(images);
  50. if (ret)
  51. return ret;
  52. return board_prep_linux(images);
  53. }
  54. /* Generic implementation for single core CPU */
  55. __weak void board_jump_and_run(ulong entry, int zero, int arch, uint params)
  56. {
  57. void (*kernel_entry)(int zero, int arch, uint params);
  58. kernel_entry = (void (*)(int, int, uint))entry;
  59. kernel_entry(zero, arch, params);
  60. }
  61. /* Subcommand: GO */
  62. static void boot_jump_linux(bootm_headers_t *images, int flag)
  63. {
  64. ulong kernel_entry;
  65. unsigned int r0, r2;
  66. int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
  67. kernel_entry = images->ep;
  68. debug("## Transferring control to Linux (at address %08lx)...\n",
  69. kernel_entry);
  70. bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  71. printf("\nStarting kernel ...%s\n\n", fake ?
  72. "(fake run for tracing)" : "");
  73. bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  74. if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
  75. r0 = 2;
  76. r2 = (unsigned int)images->ft_addr;
  77. } else {
  78. r0 = 1;
  79. r2 = (unsigned int)env_get("bootargs");
  80. }
  81. cleanup_before_linux();
  82. if (!fake)
  83. board_jump_and_run(kernel_entry, r0, 0, r2);
  84. }
  85. int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
  86. {
  87. /* No need for those on ARC */
  88. if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE))
  89. return -1;
  90. if (flag & BOOTM_STATE_OS_PREP)
  91. return boot_prep_linux(images);
  92. if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
  93. boot_jump_linux(images, flag);
  94. return 0;
  95. }
  96. return -1;
  97. }