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efiprefix.c 2.4KB

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  1. /*
  2. * Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
  3. *
  4. * This program is free software; you can redistribute it and/or
  5. * modify it under the terms of the GNU General Public License as
  6. * published by the Free Software Foundation; either version 2 of the
  7. * License, or any later version.
  8. *
  9. * This program is distributed in the hope that it will be useful, but
  10. * WITHOUT ANY WARRANTY; without even the implied warranty of
  11. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. * General Public License for more details.
  13. *
  14. * You should have received a copy of the GNU General Public License
  15. * along with this program; if not, write to the Free Software
  16. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17. * 02110-1301, USA.
  18. */
  19. FILE_LICENCE ( GPL2_OR_LATER );
  20. #include <stdlib.h>
  21. #include <errno.h>
  22. #include <ipxe/device.h>
  23. #include <ipxe/efi/efi.h>
  24. #include <ipxe/efi/efi_driver.h>
  25. #include <ipxe/efi/efi_snp.h>
  26. #include <ipxe/efi/efi_autoboot.h>
  27. #include <ipxe/efi/efi_watchdog.h>
  28. /**
  29. * EFI entry point
  30. *
  31. * @v image_handle Image handle
  32. * @v systab System table
  33. * @ret efirc EFI return status code
  34. */
  35. EFI_STATUS EFIAPI _efi_start ( EFI_HANDLE image_handle,
  36. EFI_SYSTEM_TABLE *systab ) {
  37. EFI_STATUS efirc;
  38. int rc;
  39. /* Initialise EFI environment */
  40. if ( ( efirc = efi_init ( image_handle, systab ) ) != 0 )
  41. goto err_init;
  42. /* Record autoboot device (if any) */
  43. efi_set_autoboot();
  44. /* Claim SNP devices for use by iPXE */
  45. efi_snp_claim();
  46. /* Start watchdog holdoff timer */
  47. efi_watchdog_start();
  48. /* Call to main() */
  49. if ( ( rc = main() ) != 0 ) {
  50. efirc = EFIRC ( rc );
  51. goto err_main;
  52. }
  53. err_main:
  54. efi_watchdog_stop();
  55. efi_snp_release();
  56. efi_loaded_image->Unload ( image_handle );
  57. efi_driver_reconnect_all();
  58. err_init:
  59. return efirc;
  60. }
  61. /**
  62. * Probe EFI root bus
  63. *
  64. * @v rootdev EFI root device
  65. */
  66. static int efi_probe ( struct root_device *rootdev __unused ) {
  67. return efi_driver_connect_all();
  68. }
  69. /**
  70. * Remove EFI root bus
  71. *
  72. * @v rootdev EFI root device
  73. */
  74. static void efi_remove ( struct root_device *rootdev __unused ) {
  75. efi_driver_disconnect_all();
  76. }
  77. /** EFI root device driver */
  78. static struct root_driver efi_root_driver = {
  79. .probe = efi_probe,
  80. .remove = efi_remove,
  81. };
  82. /** EFI root device */
  83. struct root_device efi_root_device __root_device = {
  84. .dev = { .name = "EFI" },
  85. .driver = &efi_root_driver,
  86. };