1 files changed, 156 insertions, 0 deletions
diff --git a/grub-core/osdep/linux/platform.c b/grub-core/osdep/linux/platform.c
new file mode 100644
index 0000000..e28a79d
--- /dev/null
+++ b/grub-core/osdep/linux/platform.c
@@ -0,0 +1,156 @@
+/*
+ *  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 <grub/util/install.h>
+#include <grub/emu/exec.h>
+#include <grub/emu/misc.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <string.h>
+
+#include <sys/utsname.h>
+
+static int
+is_not_empty_directory (const char *dir)
+{
+  DIR *d;
+  struct dirent *de;
+
+  d = opendir (dir);
+  if (!d)
+    return 0;
+  while ((de = readdir (d)))
+    {
+      if (strcmp (de->d_name, ".") == 0
+	  || strcmp (de->d_name, "..") == 0)
+	continue;
+      closedir (d);
+      return 1;
+    }
+
+  closedir (d);
+  return 0;
+}
+
+static int
+is_64_kernel (void)
+{
+  struct utsname un;
+
+  if (uname (&un) < 0)
+    return 0;
+
+  return strcmp (un.machine, "x86_64") == 0;
+}
+
+static int
+read_platform_size (void)
+{
+  FILE *fp;
+  char *buf = NULL;
+  size_t len = 0;
+  int ret = 0;
+
+  /* Newer kernels can tell us directly about the size of the
+   * underlying firmware - let's see if that interface is there. */
+  fp = grub_util_fopen ("/sys/firmware/efi/fw_platform_size", "r");
+  if (fp != NULL)
+  {
+    if (getline (&buf, &len, fp) >= 3) /* 2 digits plus newline */
+      {
+	if (strncmp (buf, "32", 2) == 0)
+	  ret = 32;
+	else if (strncmp (buf, "64", 2) == 0)
+	  ret = 64;
+      }
+    free (buf);
+    fclose (fp);
+  }
+
+  if (ret == 0)
+    {
+      /* Unrecognised - fall back to matching the kernel size
+       * instead */
+      if (is_64_kernel ())
+	ret = 64;
+      else
+	ret = 32;
+    }
+
+  return ret;
+}
+
+/* Are we running on an EFI-based system? */
+static int
+is_efi_system (void)
+{
+  /*
+   * Linux uses efivarfs (mounted on /sys/firmware/efi/efivars) to access the
+   * EFI variable store. Some legacy systems may still use the deprecated
+   * efivars interface (accessed through /sys/firmware/efi/vars). Where both
+   * are present, libefivar will use the former in preference, so attempting
+   * to load efivars will not interfere with later operations.
+   */
+  grub_util_exec_redirect_all ((const char * []){ "modprobe", "efivars", NULL },
+			       NULL, NULL, "/dev/null");
+
+  grub_util_info ("Looking for /sys/firmware/efi ..");
+  if (is_not_empty_directory ("/sys/firmware/efi"))
+    {
+      grub_util_info ("...found");
+      return 1;
+    }
+  else
+    {
+      grub_util_info ("... not found");
+      return 0;
+    }
+}
+
+const char *
+grub_install_get_default_arm_platform (void)
+{
+  if (is_efi_system())
+    return "arm-efi";
+  else
+    return "arm-uboot";
+}
+
+const char *
+grub_install_get_default_x86_platform (void)
+{
+  if (is_efi_system())
+    {
+      if (read_platform_size() == 64)
+	return "x86_64-efi";
+      else
+	return "i386-efi";
+    }
+
+  grub_util_info ("Looking for /proc/device-tree ..");
+  if (is_not_empty_directory ("/proc/device-tree"))
+    {
+      grub_util_info ("...found");
+      return "i386-ieee1275";
+    }
+
+  grub_util_info ("... not found");
+  return "i386-pc";
+}