void mm_initialize(FAR struct mm_heap_s *heap, FAR void *heapstart,
size_t heapsize)
{
int i;
mlldbg("Heap: start=%p size=%u\n", heapstart, heapsize);
/* The following two lines have cause problems for some older ZiLog
* compilers in the past (but not the more recent). Life is easier if we
* just the suppress them altogther for those tools.
*/
#ifndef __ZILOG__
CHECK_ALLOCNODE_SIZE;
CHECK_FREENODE_SIZE;
#endif
/* Set up global variables */
heap->mm_heapsize = 0;
#if CONFIG_MM_REGIONS > 1
heap->mm_nregions = 0;
#endif
/* Initialize the node array */
memset(heap->mm_nodelist, 0, sizeof(struct mm_freenode_s) * MM_NNODES);
for (i = 1; i < MM_NNODES; i++)
{
heap->mm_nodelist[i-1].flink = &heap->mm_nodelist[i];
heap->mm_nodelist[i].blink = &heap->mm_nodelist[i-1];
}
/* Initialize the malloc semaphore to one (to support one-at-
* a-time access to private data sets).
*/
mm_seminitialize(heap);
/* Add the initial region of memory to the heap */
mm_addregion(heap, heapstart, heapsize);
}
void mm_addregion(FAR void *heapstart, size_t heapsize)
{
FAR struct mm_freenode_s *node;
uintptr_t heapbase;
uintptr_t heapend;
#if CONFIG_MM_REGIONS > 1
int IDX = g_nregions;
#else
# define IDX 0
#endif
/* If the MCU handles wide addresses but the memory manager
* is configured for a small heap, then verify that the caller
* not doing something crazy.
*/
#if defined(CONFIG_MM_SMALL) && !defined(CONFIG_SMALL_MEMORY)
DEBUGASSERT(heapsize <= MMSIZE_MAX+1);
#endif
/* Adjust the provide heap start and size so that they are
* both aligned with the MM_MIN_CHUNK size.
*/
heapbase = MM_ALIGN_UP((uintptr_t)heapstart);
heapend = MM_ALIGN_DOWN((uintptr_t)heapstart + (uintptr_t)heapsize);
heapsize = heapend - heapbase;
mlldbg("Region %d: base=%p size=%u\n", IDX+1, heapstart, heapsize);
/* Add the size of this region to the total size of the heap */
g_heapsize += heapsize;
/* Create two "allocated" guard nodes at the beginning and end of
* the heap. These only serve to keep us from allocating outside
* of the heap.
*
* And create one free node between the guard nodes that contains
* all available memory.
*/
g_heapstart[IDX] = (FAR struct mm_allocnode_s *)heapbase;
g_heapstart[IDX]->size = SIZEOF_MM_ALLOCNODE;
g_heapstart[IDX]->preceding = MM_ALLOC_BIT;
node = (FAR struct mm_freenode_s *)(heapbase + SIZEOF_MM_ALLOCNODE);
node->size = heapsize - 2*SIZEOF_MM_ALLOCNODE;
node->preceding = SIZEOF_MM_ALLOCNODE;
g_heapend[IDX] = (FAR struct mm_allocnode_s *)(heapend - SIZEOF_MM_ALLOCNODE);
g_heapend[IDX]->size = SIZEOF_MM_ALLOCNODE;
g_heapend[IDX]->preceding = node->size | MM_ALLOC_BIT;
#undef IDX
#if CONFIG_MM_REGIONS > 1
g_nregions++;
#endif
/* Add the single, large free node to the nodelist */
mm_addfreechunk(node);
}
