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+/**
+ * @file rtems/malloc.h
+ *
+ * This file defines the interface to RTEMS extensions to the Malloc Family.
+ */
+
+/*
+ * COPYRIGHT (c) 1989-2011.
+ * On-Line Applications Research Corporation (OAR).
+ *
+ * The license and distribution terms for this file may in
+ * the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef _RTEMS_MALLOC_H
+#define _RTEMS_MALLOC_H
+
+#include <rtems.h>
+#include <rtems/bspIo.h>
+#include <rtems/libcsupport.h> /* for malloc_walk() */
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @defgroup MallocSupport Malloc Support
+ *
+ * @ingroup libcsupport
+ *
+ * @brief RTEMS extensions to the Malloc Family
+ */
+
+/**
+ * @brief C program heap control.
+ *
+ * This is the pointer to the heap control structure used to manage the C
+ * program heap.
+ */
+extern Heap_Control *RTEMS_Malloc_Heap;
+
+void RTEMS_Malloc_Initialize(
+ const Heap_Area *areas,
+ size_t area_count,
+ Heap_Initialization_or_extend_handler extend
+);
+
+extern ptrdiff_t RTEMS_Malloc_Sbrk_amount;
+
+static inline void rtems_heap_set_sbrk_amount( ptrdiff_t sbrk_amount )
+{
+ RTEMS_Malloc_Sbrk_amount = sbrk_amount;
+}
+
+typedef void *(*rtems_heap_extend_handler)(
+ Heap_Control *heap,
+ size_t alloc_size
+);
+
+/**
+ * @brief RTEMS Extend Heap via Sbrk
+ */
+void *rtems_heap_extend_via_sbrk(
+ Heap_Control *heap,
+ size_t alloc_size
+);
+
+void *rtems_heap_null_extend(
+ Heap_Control *heap,
+ size_t alloc_size
+);
+
+extern const rtems_heap_extend_handler rtems_malloc_extend_handler;
+
+/*
+ * Malloc Plugin to Dirty Memory at Allocation Time
+ */
+typedef void (*rtems_malloc_dirtier_t)(void *, size_t);
+extern rtems_malloc_dirtier_t rtems_malloc_dirty_helper;
+
+/**
+ * @brief Dirty Memory Function
+ *
+ * This method fills the specified area with a non-zero pattern
+ * to aid in debugging programs which do not initialize their
+ * memory allocated from the heap.
+ */
+void rtems_malloc_dirty_memory(
+ void *start,
+ size_t size
+);
+
+/**
+ * @brief RTEMS Variation on Aligned Memory Allocation
+ *
+ * This method is a help memalign implementation which does all
+ * error checking done by posix_memalign() EXCEPT it does NOT
+ * place numeric restrictions on the alignment value.
+ *
+ * @param[in] pointer points to the user pointer
+ * @param[in] alignment is the desired alignment
+ * @param[in] size is the allocation request size in bytes
+ *
+ * @return This methods returns zero on success and a POSIX errno
+ * value to indicate the failure condition. On success
+ * *pointer will contain the address of the allocated memory.
+ */
+int rtems_memalign(
+ void **pointer,
+ size_t alignment,
+ size_t size
+);
+
+/**
+ * @brief Allocates a memory area of size @a size bytes from the heap.
+ *
+ * If the alignment parameter @a alignment is not equal to zero, the allocated
+ * memory area will begin at an address aligned by this value.
+ *
+ * If the boundary parameter @a boundary is not equal to zero, the allocated
+ * memory area will comply with a boundary constraint. The boundary value
+ * specifies the set of addresses which are aligned by the boundary value. The
+ * interior of the allocated memory area will not contain an element of this
+ * set. The begin or end address of the area may be a member of the set.
+ *
+ * A size value of zero will return a unique address which may be freed with
+ * free().
+ *
+ * The memory allocated by this function can be released with a call to free().
+ *
+ * @return A pointer to the begin of the allocated memory area, or @c NULL if
+ * no memory is available or the parameters are inconsistent.
+ */
+void *rtems_heap_allocate_aligned_with_boundary(
+ size_t size,
+ uintptr_t alignment,
+ uintptr_t boundary
+);
+
+/**
+ * @brief Extends the memory available for the heap using the memory area
+ * starting at @a area_begin of size @a area_size bytes.
+ *
+ * There are no alignment requirements. The memory area must be big enough to
+ * contain some maintenance blocks. It must not overlap parts of the current
+ * heap areas. Disconnected subordinate heap areas will lead to used blocks
+ * which cover the gaps. Extending with an inappropriate memory area will
+ * corrupt the heap.
+ *
+ * @retval RTEMS_SUCCESSFUL Successful operation.
+ * @retval RTEMS_INVALID_ADDRESS Invalid memory area.
+ */
+rtems_status_code rtems_heap_extend(
+ void *area_begin,
+ uintptr_t area_size
+);
+
+/**
+ * @brief Greedy allocate that empties the heap.
+ *
+ * Afterwards the heap has at most @a block_count allocatable blocks of sizes
+ * specified by @a block_sizes. The @a block_sizes must point to an array with
+ * @a block_count members. All other blocks are used.
+ *
+ * @see rtems_heap_greedy_free().
+ */
+void *rtems_heap_greedy_allocate(
+ const uintptr_t *block_sizes,
+ size_t block_count
+);
+
+/**
+ * @brief Greedy allocate all blocks except the largest free block.
+ *
+ * Afterwards the heap has at most one allocatable block. This block is the
+ * largest free block if it exists. The allocatable size of this block is
+ * stored in @a allocatable_size. All other blocks are used.
+ *
+ * @see rtems_heap_greedy_free().
+ */
+void *rtems_heap_greedy_allocate_all_except_largest(
+ uintptr_t *allocatable_size
+);
+
+/**
+ * @brief Frees space of a greedy allocation.
+ *
+ * The @a opaque argument must be the return value of
+ * rtems_heap_greedy_allocate() or
+ * rtems_heap_greedy_allocate_all_except_largest().
+ */
+void rtems_heap_greedy_free( void *opaque );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif