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| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2009-10-11 19:43:13 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2009-10-11 19:43:13 +0000 |
| commit | 85786fabbfd94e480ff43a8979f074c1fd6292e1 (patch) | |
| tree | e1e470fc1b8e2002104ec55e08ac548ca8d899b9 /os/kernel | |
| parent | 1b7bfa2fa713c75df4bbea37fc50b1d6d7b93839 (diff) | |
| download | ChibiOS-85786fabbfd94e480ff43a8979f074c1fd6292e1.tar.gz ChibiOS-85786fabbfd94e480ff43a8979f074c1fd6292e1.tar.bz2 ChibiOS-85786fabbfd94e480ff43a8979f074c1fd6292e1.zip | |
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1218 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os/kernel')
| -rw-r--r-- | os/kernel/include/mem.h | 61 | ||||
| -rw-r--r-- | os/kernel/src/chmem.c | 94 |
2 files changed, 155 insertions, 0 deletions
diff --git a/os/kernel/include/mem.h b/os/kernel/include/mem.h new file mode 100644 index 000000000..c7f5ba07a --- /dev/null +++ b/os/kernel/include/mem.h @@ -0,0 +1,61 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT 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/RT 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 mem.h
+ * @brief Low level memory manager macros and structures.
+ * @addtogroup coremem
+ * @{
+ */
+
+#ifndef _MEM_H_
+#define _MEM_H_
+
+#if CH_USE_COREMEM
+
+/**
+ * @brief Memory alignment type. + */
+typedef void *align_t;
+
+/**
+ * @brief Alignment mask constant. + */
+#define MEM_ALIGN_MASK (sizeof(align_t) - 1)
+
+/**
+ * @brief Alignment helper macro. + */
+#define MEM_ALIGN_SIZE(p) (((size_t)(p) + ALIGN_MASK) & ~ALIGN_MASK)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ void mem_init(void);
+ void *chMemAlloc(size_t size);
+ void *chMemAllocI(size_t size);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CH_USE_COREMEM */
+
+#endif /* _MEM_H_ */
+
+/** @} */
diff --git a/os/kernel/src/chmem.c b/os/kernel/src/chmem.c new file mode 100644 index 000000000..3ac45a6ae --- /dev/null +++ b/os/kernel/src/chmem.c @@ -0,0 +1,94 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
+
+ This file is part of ChibiOS/RT.
+
+ ChibiOS/RT 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/RT 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.c
+ * @brief Low level memory manager code.
+ * @addtogroup coremem
+ * @{
+ */
+
+#include <ch.h>
+
+#if CH_USE_COREMEM
+
+#if CH_COREMEM_SIZE == 0
+ extern align_t __heap_base__;
+ extern align_t __heap_end__;
+#else
+align_t buffer[ALIGN_SIZE(CH_MEM_SIZE) / sizeof(align_t)];
+#endif
+
+static align_t *nextmem;
+static align_t *endmem;
+
+void mem_init(void) {
+#if CH_COREMEM_SIZE == 0
+ nextmem = &__heap_base__;
+ endmem = &__heap_end__;
+#else
+ nextmem = &buffer[0];
+ endmem = &buffer[ALIGN_SIZE(CH_MEM_SIZE) / sizeof(align_t)];
+#endif
+}
+
+/**
+ * @brief Allocates a block of memory.
+ * @details The size of the returned block is aligned to the alignment
+ * type @p align_t so it is not possible to allocate less than
+ * <code>sizeof(align_t)</code>.
+ *
+ *
+ * @param[in] the size of the block to be allocated
+ * @return A pointer to the allocated memory block.
+ * @retval NULL allocation failed, core memory exhausted. + */
+void *chCoreAlloc(size_t size) {
+ void *p;
+
+ chSysLock();
+ p = chCoreAllocI(size);
+ chSysUnlock();
+ return p;
+}
+
+/**
+ * @brief Allocates a block of memory.
+ * @details The size of the returned block is aligned to the alignment
+ * type @p align_t so it is not possible to allocate less than
+ * <code>sizeof(align_t)</code>.
+ *
+ * @param[in] the size of the block to be allocated.
+ * @return A pointer to the allocated memory block.
+ * @retval NULL allocation failed, core memory exhausted.
+ */
+void *chCoreAllocI(size_t size) {
+ void *p;
+
+ size = ALIGN_SIZE(size);
+ if (nextmem + size > endmem)
+ return NULL;
+ p = nextmem;
+ nextmem += size;
+ return p;
+}
+
+#endif /* CH_USE_COREMEM */
+
+/** @} */
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