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  1. /*
  2. * Copyright (C) 2007 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. * You can also choose to distribute this program under the terms of
  20. * the Unmodified Binary Distribution Licence (as given in the file
  21. * COPYING.UBDL), provided that you have satisfied its requirements.
  22. */
  23. FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
  24. #include <ipxe/device.h>
  25. #include <ipxe/console.h>
  26. #include <ipxe/init.h>
  27. /** @file
  28. *
  29. * Initialisation, startup and shutdown routines
  30. *
  31. */
  32. /** "startup() has been called" flag */
  33. static int started = 0;
  34. /**
  35. * Initialise iPXE
  36. *
  37. * This function performs the one-time-only and irreversible
  38. * initialisation steps, such as initialising the heap. It must be
  39. * called before (almost) any other function.
  40. *
  41. * There is, by definition, no counterpart to this function on the
  42. * shutdown path.
  43. */
  44. void initialise ( void ) {
  45. struct init_fn *init_fn;
  46. /* Call registered initialisation functions */
  47. for_each_table_entry ( init_fn, INIT_FNS )
  48. init_fn->initialise ();
  49. }
  50. /**
  51. * Start up iPXE
  52. *
  53. * This function performs the repeatable initialisation steps, such as
  54. * probing devices. You may call startup() and shutdown() multiple
  55. * times (as is done via the PXE API when PXENV_START_UNDI is used).
  56. */
  57. void startup ( void ) {
  58. struct startup_fn *startup_fn;
  59. if ( started )
  60. return;
  61. /* Call registered startup functions */
  62. for_each_table_entry ( startup_fn, STARTUP_FNS ) {
  63. if ( startup_fn->startup )
  64. startup_fn->startup();
  65. }
  66. started = 1;
  67. }
  68. /**
  69. * Shut down iPXE
  70. *
  71. * @v flags Shutdown behaviour flags
  72. *
  73. * This function reverses the actions of startup(), and leaves iPXE in
  74. * a state ready to be removed from memory. You may call startup()
  75. * again after calling shutdown().
  76. *
  77. * Call this function only once, before either exiting main() or
  78. * starting up a non-returnable image.
  79. */
  80. void shutdown ( int flags ) {
  81. struct startup_fn *startup_fn;
  82. if ( ! started )
  83. return;
  84. /* Call registered shutdown functions (in reverse order) */
  85. for_each_table_entry_reverse ( startup_fn, STARTUP_FNS ) {
  86. if ( startup_fn->shutdown )
  87. startup_fn->shutdown ( flags );
  88. }
  89. /* Reset console */
  90. console_reset();
  91. started = 0;
  92. }