multiboot_mmap.c 2.7 KB

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  1. /*
  2. * GRUB -- GRand Unified Bootloader
  3. * Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
  4. *
  5. * GRUB is free software: you can redistribute it and/or modify
  6. * it under the terms of the GNU General Public License as published by
  7. * the Free Software Foundation, either version 3 of the License, or
  8. * (at your option) any later version.
  9. *
  10. * GRUB is distributed in the hope that it will be useful,
  11. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13. * GNU General Public License for more details.
  14. *
  15. * You should have received a copy of the GNU General Public License
  16. * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
  17. */
  18. #include <grub/machine/memory.h>
  19. #include <grub/types.h>
  20. #include <grub/multiboot.h>
  21. #include <grub/err.h>
  22. #include <grub/misc.h>
  23. /* A pointer to the MBI in its initial location. */
  24. struct multiboot_info *startup_multiboot_info;
  25. /* The MBI has to be copied to our BSS so that it won't be
  26. overwritten. This is its final location. */
  27. static struct multiboot_info kern_multiboot_info;
  28. /* Unfortunately we can't use heap at this point. But 32 looks like a sane
  29. limit (used by memtest86). */
  30. static grub_uint8_t mmap_entries[sizeof (struct multiboot_mmap_entry) * 32];
  31. void
  32. grub_machine_mmap_init (void)
  33. {
  34. if (! startup_multiboot_info)
  35. grub_fatal ("Unable to find Multiboot Information (is CONFIG_MULTIBOOT disabled in coreboot?)");
  36. /* Move MBI to a safe place. */
  37. grub_memmove (&kern_multiboot_info, startup_multiboot_info, sizeof (struct multiboot_info));
  38. if ((kern_multiboot_info.flags & MULTIBOOT_INFO_MEM_MAP) == 0)
  39. grub_fatal ("Missing Multiboot memory information");
  40. /* Move the memory map to a safe place. */
  41. if (kern_multiboot_info.mmap_length > sizeof (mmap_entries))
  42. {
  43. grub_printf ("WARNING: Memory map size exceeds limit (0x%x > 0x%x); it will be truncated\n",
  44. kern_multiboot_info.mmap_length, sizeof (mmap_entries));
  45. kern_multiboot_info.mmap_length = sizeof (mmap_entries);
  46. }
  47. grub_memmove (mmap_entries, (void *) kern_multiboot_info.mmap_addr, kern_multiboot_info.mmap_length);
  48. kern_multiboot_info.mmap_addr = (grub_uint32_t) mmap_entries;
  49. }
  50. grub_err_t
  51. grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
  52. {
  53. struct multiboot_mmap_entry *entry = (void *) kern_multiboot_info.mmap_addr;
  54. while ((unsigned long) entry < kern_multiboot_info.mmap_addr + kern_multiboot_info.mmap_length)
  55. {
  56. if (hook (entry->addr, entry->len, entry->type, hook_data))
  57. break;
  58. entry = (void *) ((grub_addr_t) entry + entry->size + sizeof (entry->size));
  59. }
  60. return 0;
  61. }