Move OS-dependent mprotect for module loading to grub-core/osdep/*/dl.c

and implement windows variant.

grub-core/osdep/windows/dl.c

@@ -0,0 +1,59 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  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 <config.h>
+#include <config-util.h>
+
+#include <grub/dl.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <stdlib.h>
+#include <string.h>
+#include <windows.h>
+
+void *
+grub_osdep_dl_memalign (grub_size_t align, grub_size_t size)
+{
+  void *ret;
+  if (align > 4096)
+    {
+      grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, N_("too large alignment"));
+      return NULL;
+    }
+
+  size = ALIGN_UP (size, 4096);
+
+  ret = VirtualAlloc (NULL, size, MEM_COMMIT | MEM_RESERVE,
+		      PAGE_EXECUTE_READWRITE);
+
+  if (!ret)
+    {
+      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
+      return NULL;
+    }
+
+  return ret;
+}
+
+void
+grub_dl_osdep_dl_free (void *ptr)
+{
+  if (!ptr)
+    return;
+  VirtualFree (ptr, 0,  MEM_RELEASE);
+}