Index: include/grub/i386/pc/memory.h
===================================================================
--- include/grub/i386/pc/memory.h	(revisión: 2447)
+++ include/grub/i386/pc/memory.h	(copia de trabajo)
@@ -126,6 +126,32 @@
 }
 #endif
 
+typedef union
+{
+  struct
+  {
+    /* Given that i386 is little-endian, this order matches the in-memory
+       format of CPU realmode far pointers.  */
+    grub_uint16_t offset;
+    grub_uint16_t segment;
+  } __attribute__ ((packed));
+  grub_uint32_t raw_bits;
+} grub_machine_farptr;
+
+static inline void *
+grub_machine_real2linear (grub_machine_farptr ptr)
+{
+  return UINT_TO_PTR ((((grub_uint32_t) ptr.segment) << 4) + ptr.offset);
+}
+
+static inline grub_machine_farptr
+grub_machine_linear2real (void *addr)
+{
+  grub_machine_farptr ret = { { PTR_TO_UINT32 (addr) & 0x0000000F,
+			       (PTR_TO_UINT32 (addr) & 0x000FFFF0) >> 4 } };
+  return ret;
+}
+
 #endif
 
 #endif /* ! GRUB_MEMORY_MACHINE_HEADER */