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incubator-nuttx/mm/mm_heap/mm_initialize.c

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/****************************************************************************
* mm/mm_heap/mm_initialize.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <string.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/mm/mm.h>
#include "mm_heap/mm.h"
#include "kasan/kasan.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: mm_addregion
*
* Description:
* This function adds a region of contiguous memory to the selected heap.
*
* Input Parameters:
* heap - The selected heap
* heapstart - Start of the heap region
* heapsize - Size of the heap region
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
void mm_addregion(FAR struct mm_heap_s *heap, 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;
IDX = heap->mm_nregions;
/* Writing past CONFIG_MM_REGIONS would have catastrophic consequences */
DEBUGASSERT(IDX < CONFIG_MM_REGIONS);
if (IDX >= CONFIG_MM_REGIONS)
{
return;
}
#else
# define IDX 0
#endif
#if defined(CONFIG_MM_SMALL) && !defined(CONFIG_SMALL_MEMORY)
/* If the MCU handles wide addresses but the memory manager is configured
* for a small heap, then verify that the caller is not doing something
* crazy.
*/
DEBUGASSERT(heapsize <= MMSIZE_MAX + 1);
#endif
/* Register to KASan for access check */
kasan_register(heapstart, &heapsize);
DEBUGVERIFY(mm_takesemaphore(heap));
/* Adjust the provided heap start and size.
*
* Note: (uintptr_t)node + SIZEOF_MM_ALLOCNODE is what's actually
* returned to the malloc user, which should have natural alignment.
* (that is, in this implementation, MM_MIN_CHUNK-alignment.)
*/
heapbase = MM_ALIGN_UP((uintptr_t)heapstart + 2 * SIZEOF_MM_ALLOCNODE) -
2 * SIZEOF_MM_ALLOCNODE;
heapend = MM_ALIGN_DOWN((uintptr_t)heapstart + (uintptr_t)heapsize);
heapsize = heapend - heapbase;
#if defined(CONFIG_FS_PROCFS) && \
!defined(CONFIG_FS_PROCFS_EXCLUDE_MEMINFO) && \
(defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__))
minfo("[%s] Region %d: base=%p size=%zu\n",
heap->mm_procfs.name, IDX + 1, heapstart, heapsize);
#else
minfo("Region %d: base=%p size=%zu\n", IDX + 1, heapstart, heapsize);
#endif
/* Add the size of this region to the total size of the heap */
heap->mm_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.
*/
heap->mm_heapstart[IDX] = (FAR struct mm_allocnode_s *)
heapbase;
MM_ADD_BACKTRACE(heap, heap->mm_heapstart[IDX]);
heap->mm_heapstart[IDX]->size = SIZEOF_MM_ALLOCNODE;
heap->mm_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;
heap->mm_heapend[IDX] = (FAR struct mm_allocnode_s *)
(heapend - SIZEOF_MM_ALLOCNODE);
heap->mm_heapend[IDX]->size = SIZEOF_MM_ALLOCNODE;
heap->mm_heapend[IDX]->preceding = node->size | MM_ALLOC_BIT;
MM_ADD_BACKTRACE(heap, heap->mm_heapend[IDX]);
#undef IDX
#if CONFIG_MM_REGIONS > 1
heap->mm_nregions++;
#endif
/* Add the single, large free node to the nodelist */
mm_addfreechunk(heap, node);
mm_givesemaphore(heap);
}
/****************************************************************************
* Name: mm_initialize
*
* Description:
* Initialize the selected heap data structures, providing the initial
* heap region.
*
* Input Parameters:
* name - The heap procfs name
* heap - The selected heap
* heapstart - Start of the initial heap region
* heapsize - Size of the initial heap region
*
* Returned Value:
* Return the address of a new heap instance.
*
* Assumptions:
*
****************************************************************************/
FAR struct mm_heap_s *mm_initialize(FAR const char *name,
FAR void *heapstart, size_t heapsize)
{
FAR struct mm_heap_s *heap;
uintptr_t heap_adj;
int i;
minfo("Heap: name=%s, start=%p size=%zu\n", name, heapstart, heapsize);
/* First ensure the memory to be used is aligned */
heap_adj = MM_ALIGN_UP((uintptr_t)heapstart);
heapsize -= heap_adj - (uintptr_t)heapstart;
/* Reserve a block space for mm_heap_s context */
DEBUGASSERT(heapsize > sizeof(struct mm_heap_s));
heap = (FAR struct mm_heap_s *)heap_adj;
heapsize -= sizeof(struct mm_heap_s);
heapstart = (FAR char *)heap_adj + sizeof(struct mm_heap_s);
DEBUGASSERT(MM_MIN_CHUNK >= SIZEOF_MM_FREENODE);
DEBUGASSERT(MM_MIN_CHUNK >= SIZEOF_MM_ALLOCNODE);
/* Set up global variables */
memset(heap, 0, sizeof(struct mm_heap_s));
/* Initialize the node array */
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);
#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MEMINFO)
# if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
heap->mm_procfs.name = name;
heap->mm_procfs.heap = heap;
# if defined (CONFIG_DEBUG_MM) && defined(CONFIG_MM_BACKTRACE_DEFAULT)
heap->mm_procfs.backtrace = true;
# endif
# endif
#endif
/* Add the initial region of memory to the heap */
mm_addregion(heap, heapstart, heapsize);
#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MEMINFO)
# if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
procfs_register_meminfo(&heap->mm_procfs);
# endif
#endif
return heap;
}
/****************************************************************************
* Name: mm_uninitialize
*
* Description:
* Uninitialize the selected heap data structures.
*
* Input Parameters:
* heap - The heap to uninitialize
*
* Returned Value:
* None
*
****************************************************************************/
void mm_uninitialize(FAR struct mm_heap_s *heap)
{
#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MEMINFO)
# if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
procfs_unregister_meminfo(&heap->mm_procfs);
# endif
#endif
mm_semuninitialize(heap);
}
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