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Diffstat (limited to 'os/rt/src/chmemcore.c')
| -rw-r--r-- | os/rt/src/chmemcore.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/os/rt/src/chmemcore.c b/os/rt/src/chmemcore.c new file mode 100644 index 000000000..d5e7ed79c --- /dev/null +++ b/os/rt/src/chmemcore.c @@ -0,0 +1,153 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+ 2011,2012,2013 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 chmemcore.c
+ * @brief Core memory manager code.
+ *
+ * @addtogroup memcore
+ * @details Core Memory Manager related APIs and services.
+ * <h2>Operation mode</h2>
+ * The core memory manager is a simplified allocator that only
+ * allows to allocate memory blocks without the possibility to
+ * free them.<br>
+ * This allocator is meant as a memory blocks provider for the
+ * other allocators such as:
+ * - C-Runtime allocator (through a compiler specific adapter module).
+ * - Heap allocator (see @ref heaps).
+ * - Memory pools allocator (see @ref pools).
+ * .
+ * By having a centralized memory provider the various allocators
+ * can coexist and share the main memory.<br>
+ * This allocator, alone, is also useful for very simple
+ * applications that just require a simple way to get memory
+ * blocks.
+ * @pre In order to use the core memory manager APIs the @p CH_CFG_USE_MEMCORE
+ * option must be enabled in @p chconf.h.
+ * @{
+ */
+
+#include "ch.h"
+
+#if CH_CFG_USE_MEMCORE || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Module exported variables. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Module local types. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Module local variables. */
+/*===========================================================================*/
+
+static uint8_t *nextmem;
+static uint8_t *endmem;
+
+/*===========================================================================*/
+/* Module local functions. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Module exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Low level memory manager initialization.
+ *
+ * @notapi
+ */
+void _core_init(void) {
+#if CH_CFG_MEMCORE_SIZE == 0
+ extern uint8_t __heap_base__[];
+ extern uint8_t __heap_end__[];
+
+ nextmem = (uint8_t *)MEM_ALIGN_NEXT(__heap_base__);
+ endmem = (uint8_t *)MEM_ALIGN_PREV(__heap_end__);
+#else
+ static stkalign_t buffer[MEM_ALIGN_NEXT(CH_CFG_MEMCORE_SIZE)/MEM_ALIGN_SIZE];
+
+ nextmem = (uint8_t *)&buffer[0];
+ endmem = (uint8_t *)&buffer[MEM_ALIGN_NEXT(CH_CFG_MEMCORE_SIZE)/MEM_ALIGN_SIZE];
+#endif
+}
+
+/**
+ * @brief Allocates a memory block.
+ * @details The size of the returned block is aligned to the alignment
+ * type so it is not possible to allocate less
+ * than <code>MEM_ALIGN_SIZE</code>.
+ *
+ * @param[in] size the size of the block to be allocated
+ * @return A pointer to the allocated memory block.
+ * @retval NULL allocation failed, core memory exhausted.
+ *
+ * @api
+ */
+void *chCoreAlloc(size_t size) {
+ void *p;
+
+ chSysLock();
+ p = chCoreAllocI(size);
+ chSysUnlock();
+ return p;
+}
+
+/**
+ * @brief Allocates a memory block.
+ * @details The size of the returned block is aligned to the alignment
+ * type so it is not possible to allocate less than
+ * <code>MEM_ALIGN_SIZE</code>.
+ *
+ * @param[in] size the size of the block to be allocated.
+ * @return A pointer to the allocated memory block.
+ * @retval NULL allocation failed, core memory exhausted.
+ *
+ * @iclass
+ */
+void *chCoreAllocI(size_t size) {
+ void *p;
+
+ chDbgCheckClassI();
+
+ size = MEM_ALIGN_NEXT(size);
+ if ((size_t)(endmem - nextmem) < size)
+ return NULL;
+ p = nextmem;
+ nextmem += size;
+ return p;
+}
+
+/**
+ * @brief Core memory status.
+ *
+ * @return The size, in bytes, of the free core memory.
+ *
+ * @api
+ */
+size_t chCoreStatus(void) {
+
+ return (size_t)(endmem - nextmem);
+}
+#endif /* CH_CFG_USE_MEMCORE */
+
+/** @} */
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