1 files changed, 44 insertions, 0 deletions
diff --git a/include/grub/trig.h b/include/grub/trig.h
new file mode 100644
index 0000000..f19617c
--- /dev/null
+++ b/include/grub/trig.h
@@ -0,0 +1,44 @@
+/* trig.h - Trigonometric function support.  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2008  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_TRIG_HEADER
+#define GRUB_TRIG_HEADER 1
+
+#define GRUB_TRIG_ANGLE_MAX 256
+#define GRUB_TRIG_ANGLE_MASK 255
+#define GRUB_TRIG_FRACTION_SCALE 16384
+
+extern const short grub_trig_sintab[];
+extern const short grub_trig_costab[];
+
+static __inline int
+grub_sin (int x)
+{
+  x &= GRUB_TRIG_ANGLE_MASK;
+  return grub_trig_sintab[x];
+}
+
+static __inline int
+grub_cos (int x)
+{
+  x &= GRUB_TRIG_ANGLE_MASK;
+  return grub_trig_costab[x];
+}
+
+#endif /* ! GRUB_TRIG_HEADER */