heap: Add _Heap_Greedy_allocate_all_except_largest

Add rtems_workspace_greedy_allocate_all_except_largest() and
rtems_heap_greedy_allocate_all_except_largest().

2 files changed, 28 insertions, 1 deletions

diff --git a/cpukit/score/include/rtems/score/heap.h b/cpukit/score/include/rtems/score/heap.h
index 2937490896..bea9f3ec25 100644
--- a/cpukit/score/include/rtems/score/heap.h
+++ b/cpukit/score/include/rtems/score/heap.h
@@ -595,7 +595,7 @@ void _Heap_Iterate(
 /**
  * @brief Greedy allocate that empties the heap.
  *
- * Afterward the heap has at most @a block_count allocateable blocks of sizes
+ * 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.
  *
@@ -608,6 +608,20 @@ Heap_Block *_Heap_Greedy_allocate(
 );
 
 /**
+ * @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 _Heap_Greedy_free().
+ */
+Heap_Block *_Heap_Greedy_allocate_all_except_largest(
+  Heap_Control *heap,
+  uintptr_t *allocatable_size
+);
+
+/**
  * @brief Frees blocks of a greedy allocation.
  *
  * The @a blocks must be the return value of _Heap_Greedy_allocate().
diff --git a/cpukit/score/src/heapgreedy.c b/cpukit/score/src/heapgreedy.c
index 23eb4cdd3a..b5c61a4e64 100644
--- a/cpukit/score/src/heapgreedy.c
+++ b/cpukit/score/src/heapgreedy.c
@@ -75,6 +75,19 @@ Heap_Block *_Heap_Greedy_allocate(
   return blocks;
 }
 
+Heap_Block *_Heap_Greedy_allocate_all_except_largest(
+  Heap_Control *heap,
+  uintptr_t *allocatable_size
+)
+{
+  Heap_Information info;
+
+  _Heap_Get_free_information( heap, &info );
+  *allocatable_size = info.largest - HEAP_BLOCK_HEADER_SIZE + HEAP_ALLOC_BONUS;
+
+  return _Heap_Greedy_allocate( heap, allocatable_size, 1 );
+}
+
 void _Heap_Greedy_free(
   Heap_Control *heap,
   Heap_Block *blocks