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segment.c 2.8KB

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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. /**
  25. * @file
  26. *
  27. * Executable image segments
  28. *
  29. */
  30. #include <errno.h>
  31. #include <ipxe/uaccess.h>
  32. #include <ipxe/io.h>
  33. #include <ipxe/errortab.h>
  34. #include <ipxe/segment.h>
  35. /**
  36. * Segment-specific error messages
  37. *
  38. * This error happens sufficiently often to merit a user-friendly
  39. * description.
  40. */
  41. #define ERANGE_SEGMENT __einfo_error ( EINFO_ERANGE_SEGMENT )
  42. #define EINFO_ERANGE_SEGMENT \
  43. __einfo_uniqify ( EINFO_ERANGE, 0x01, "Requested memory not available" )
  44. struct errortab segment_errors[] __errortab = {
  45. __einfo_errortab ( EINFO_ERANGE_SEGMENT ),
  46. };
  47. /**
  48. * Prepare segment for loading
  49. *
  50. * @v segment Segment start
  51. * @v filesz Size of the "allocated bytes" portion of the segment
  52. * @v memsz Size of the segment
  53. * @ret rc Return status code
  54. */
  55. int prep_segment ( userptr_t segment, size_t filesz, size_t memsz ) {
  56. struct memory_map memmap;
  57. physaddr_t start = user_to_phys ( segment, 0 );
  58. physaddr_t mid = user_to_phys ( segment, filesz );
  59. physaddr_t end = user_to_phys ( segment, memsz );
  60. unsigned int i;
  61. DBG ( "Preparing segment [%lx,%lx,%lx)\n", start, mid, end );
  62. /* Sanity check */
  63. if ( filesz > memsz ) {
  64. DBG ( "Insane segment [%lx,%lx,%lx)\n", start, mid, end );
  65. return -EINVAL;
  66. }
  67. /* Get a fresh memory map. This allows us to automatically
  68. * avoid treading on any regions that Etherboot is currently
  69. * editing out of the memory map.
  70. */
  71. get_memmap ( &memmap );
  72. /* Look for a suitable memory region */
  73. for ( i = 0 ; i < memmap.count ; i++ ) {
  74. if ( ( start >= memmap.regions[i].start ) &&
  75. ( end <= memmap.regions[i].end ) ) {
  76. /* Found valid region: zero bss and return */
  77. memset_user ( segment, filesz, 0, ( memsz - filesz ) );
  78. return 0;
  79. }
  80. }
  81. /* No suitable memory region found */
  82. DBG ( "Segment [%lx,%lx,%lx) does not fit into available memory\n",
  83. start, mid, end );
  84. return -ERANGE_SEGMENT;
  85. }