1 files changed, 88 insertions, 0 deletions
diff --git a/include/grub/relocator.h b/include/grub/relocator.h
new file mode 100644
index 0000000..1b3bdd9
--- /dev/null
+++ b/include/grub/relocator.h
@@ -0,0 +1,88 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 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/>.
+ */
+
+#ifndef GRUB_RELOCATOR_HEADER
+#define GRUB_RELOCATOR_HEADER	1
+
+#include <grub/types.h>
+#include <grub/err.h>
+#include <grub/memory.h>
+#include <grub/cpu/memory.h>
+
+struct grub_relocator;
+struct grub_relocator_chunk;
+typedef const struct grub_relocator_chunk *grub_relocator_chunk_t;
+
+struct grub_relocator *grub_relocator_new (void);
+
+grub_err_t
+grub_relocator_alloc_chunk_addr (struct grub_relocator *rel,
+				 grub_relocator_chunk_t *out,
+				 grub_phys_addr_t target, grub_size_t size);
+
+void *
+get_virtual_current_address (grub_relocator_chunk_t in);
+grub_phys_addr_t
+get_physical_target_address (grub_relocator_chunk_t in);
+
+grub_err_t
+grub_relocator_alloc_chunk_align (struct grub_relocator *rel, 
+				  grub_relocator_chunk_t *out,
+				  grub_phys_addr_t min_addr,
+				  grub_phys_addr_t max_addr,
+				  grub_size_t size, grub_size_t align,
+				  int preference,
+				  int avoid_efi_boot_services);
+
+/*
+ * Wrapper for grub_relocator_alloc_chunk_align() with purpose of
+ * protecting against integer underflow.
+ *
+ * Compare to its callee, max_addr has different meaning here.
+ * It covers entire chunk and not just start address of the chunk.
+ */
+static inline grub_err_t
+grub_relocator_alloc_chunk_align_safe (struct grub_relocator *rel,
+				       grub_relocator_chunk_t *out,
+				       grub_phys_addr_t min_addr,
+				       grub_phys_addr_t max_addr,
+				       grub_size_t size, grub_size_t align,
+				       int preference,
+				       int avoid_efi_boot_services)
+{
+  /* Sanity check and ensure following equation (max_addr - size) is safe. */
+  if (max_addr < size || (max_addr - size) < min_addr)
+    return GRUB_ERR_OUT_OF_RANGE;
+
+  return grub_relocator_alloc_chunk_align (rel, out, min_addr,
+					   max_addr - size,
+					   size, align, preference,
+					   avoid_efi_boot_services);
+}
+
+/* Top 32-bit address minus s bytes and plus 1 byte. */
+#define UP_TO_TOP32(s)	((~(s) & 0xffffffff) + 1)
+
+#define GRUB_RELOCATOR_PREFERENCE_NONE 0
+#define GRUB_RELOCATOR_PREFERENCE_LOW 1
+#define GRUB_RELOCATOR_PREFERENCE_HIGH 2
+
+void
+grub_relocator_unload (struct grub_relocator *rel);
+
+#endif