1 files changed, 73 insertions, 0 deletions
diff --git a/grub-core/kern/i386/multiboot_mmap.c b/grub-core/kern/i386/multiboot_mmap.c
new file mode 100644
index 0000000..e8f4f34
--- /dev/null
+++ b/grub-core/kern/i386/multiboot_mmap.c
@@ -0,0 +1,73 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/machine/memory.h>
+#include <grub/types.h>
+#include <grub/multiboot.h>
+#include <grub/err.h>
+#include <grub/misc.h>
+
+/* A pointer to the MBI in its initial location.  */
+struct multiboot_info *startup_multiboot_info;
+
+/* The MBI has to be copied to our BSS so that it won't be
+   overwritten.  This is its final location.  */
+static struct multiboot_info kern_multiboot_info;
+
+/* Unfortunately we can't use heap at this point.  But 32 looks like a sane
+   limit (used by memtest86).  */
+static grub_uint8_t mmap_entries[sizeof (struct multiboot_mmap_entry) * 32];
+
+void
+grub_machine_mmap_init (void)
+{
+  if (! startup_multiboot_info)
+    grub_fatal ("Unable to find Multiboot Information (is CONFIG_MULTIBOOT disabled in coreboot?)");
+
+  /* Move MBI to a safe place.  */
+  grub_memmove (&kern_multiboot_info, startup_multiboot_info, sizeof (struct multiboot_info));
+
+  if ((kern_multiboot_info.flags & MULTIBOOT_INFO_MEM_MAP) == 0)
+    grub_fatal ("Missing Multiboot memory information");
+
+  /* Move the memory map to a safe place.  */
+  if (kern_multiboot_info.mmap_length > sizeof (mmap_entries))
+    {
+      grub_printf ("WARNING: Memory map size exceeds limit (0x%x > 0x%x); it will be truncated\n",
+		   kern_multiboot_info.mmap_length, sizeof (mmap_entries));
+      kern_multiboot_info.mmap_length = sizeof (mmap_entries);
+    }
+  grub_memmove (mmap_entries, (void *) kern_multiboot_info.mmap_addr, kern_multiboot_info.mmap_length);
+  kern_multiboot_info.mmap_addr = (grub_uint32_t) mmap_entries;
+}
+
+grub_err_t
+grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
+{
+  struct multiboot_mmap_entry *entry = (void *) kern_multiboot_info.mmap_addr;
+
+  while ((unsigned long) entry < kern_multiboot_info.mmap_addr + kern_multiboot_info.mmap_length)
+    {
+      if (hook (entry->addr, entry->len, entry->type, hook_data))
+	break;
+
+      entry = (void *) ((grub_addr_t) entry + entry->size + sizeof (entry->size));
+    }
+
+  return 0;
+}