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| author | Giovanni Di Sirio <gdisirio@gmail.com> | 2016-02-16 10:07:00 +0000 |
|---|---|---|
| committer | Giovanni Di Sirio <gdisirio@gmail.com> | 2016-02-16 10:07:00 +0000 |
| commit | cf204e72ea5fd6e4be8b3295cb148fde5fdd47d2 (patch) | |
| tree | 5aae4b9a6c78c8f14c2a6ca8cd6446f42b3b29bd /os/rt/include/chalign.h | |
| parent | 641f2c372605cf405f0dda8536b45a78e0e5e2e2 (diff) | |
| download | ChibiOS-cf204e72ea5fd6e4be8b3295cb148fde5fdd47d2.tar.gz ChibiOS-cf204e72ea5fd6e4be8b3295cb148fde5fdd47d2.tar.bz2 ChibiOS-cf204e72ea5fd6e4be8b3295cb148fde5fdd47d2.zip | |
Tree reorganization.
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@8900 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os/rt/include/chalign.h')
| -rw-r--r-- | os/rt/include/chalign.h | 114 |
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 index 000000000..198e50da3 --- /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_ */
+
+/** @} */
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