1 files changed, 114 insertions, 0 deletions
diff --git a/os/rt/include/chalign.h b/os/rt/include/chalign.h
new file mode 100644
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--- /dev/null
+++ b/os/rt/include/chalign.h
@@ -0,0 +1,114 @@
+/*
+    ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio.
+
+    This file is part of ChibiOS.
+
+    ChibiOS 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.
+
+    ChibiOS 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file    chmem.h
+ * @brief   Memory alignment macros and structures.
+ *
+ * @addtogroup mem
+ * @{
+ */
+
+#ifndef _CHALIGN_H_
+#define _CHALIGN_H_
+
+/*===========================================================================*/
+/* Module constants.                                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Module pre-compile time settings.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Derived constants and error checks.                                       */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Module data structures and types.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Module macros.                                                            */
+/*===========================================================================*/
+
+/**
+ * @name    Memory alignment support macros
+ */
+/**
+ * @brief   Alignment mask constant.
+ *
+ * @param[in] a         alignment, must be a power of two
+ */
+#define MEM_ALIGN_MASK(a)       ((size_t)(a) - 1U)
+
+/**
+ * @brief   Aligns to the previous aligned memory address.
+ *
+ * @param[in] p         variable to be aligned
+ * @param[in] a         alignment, must be a power of two
+ */
+#define MEM_ALIGN_PREV(p, a)    ((size_t)(p) & ~MEM_ALIGN_MASK(a))
+
+/**
+ * @brief   Aligns to the new aligned memory address.
+ *
+ * @param[in] p         variable to be aligned
+ * @param[in] a         alignment, must be a power of two
+ */
+#define MEM_ALIGN_NEXT(p, a)    MEM_ALIGN_PREV((size_t)(p) +                \
+                                               MEM_ALIGN_MASK(a), (a))
+
+/**
+ * @brief   Returns whatever a pointer or memory size is aligned.
+ *
+ * @param[in] p         variable to be aligned
+ * @param[in] a         alignment, must be a power of two
+ */
+#define MEM_IS_ALIGNED(p, a)    (((size_t)(p) & MEM_ALIGN_MASK(a)) == 0U)
+
+/**
+ * @brief   Returns whatever a constant is a valid alignment.
+ * @details Valid alignments are powers of two.
+ *
+ * @param[in] a         alignment to be checked, must be a constant
+ */
+#define MEM_IS_VALID_ALIGNMENT(a)                                           \
+  (((size_t)(a) != 0U) && (((size_t)(a) & ((size_t)(a) - 1U)) == 0U))
+/** @} */
+
+/*===========================================================================*/
+/* External declarations.                                                    */
+/*===========================================================================*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+/*===========================================================================*/
+/* Module inline functions.                                                  */
+/*===========================================================================*/
+
+#endif /* _CHALIGN_H_ */
+
+/** @} */