1 files changed, 37 insertions, 0 deletions

diff --git a/include/nvgpu/posix/log2.h b/include/nvgpu/posix/log2.h
new file mode 100644
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+++ b/include/nvgpu/posix/log2.h
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+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __NVGPU_POSIX_LOG2_H__
+#define __NVGPU_POSIX_LOG2_H__
+
+#define ilog2(x)                        (fls(x) - 1)
+
+#define roundup_pow_of_two(x)           (1UL << fls((x) - 1))
+#define rounddown_pow_of_two(x)         (1UL << (fls(x) - 1))
+
+#define is_power_of_2(x)                                        \
+        ({                                                      \
+                typeof(x) __x__ = (x);                          \
+                (__x__ != 0 && ((__x__ & (__x__ - 1)) == 0));   \
+        })
+
+#endif