460d94729a
The return value of function mm_takesemaphore will never below than zero, DEBUGVERIFY make no effect to check it, use DEBUGASSERT instead. Signed-off-by: xiangdong6 <xiangdong6@xiaomi.com>
267 lines
8.0 KiB
C
267 lines
8.0 KiB
C
/****************************************************************************
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* mm/mm_heap/mm_initialize.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <string.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/mm/mm.h>
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#include "mm_heap/mm.h"
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#include "kasan/kasan.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mm_addregion
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*
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* Description:
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* This function adds a region of contiguous memory to the selected heap.
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*
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* Input Parameters:
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* heap - The selected heap
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* heapstart - Start of the heap region
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* heapsize - Size of the heap region
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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*
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****************************************************************************/
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void mm_addregion(FAR struct mm_heap_s *heap, FAR void *heapstart,
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size_t heapsize)
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{
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FAR struct mm_freenode_s *node;
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uintptr_t heapbase;
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uintptr_t heapend;
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bool ret;
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#if CONFIG_MM_REGIONS > 1
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int IDX;
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IDX = heap->mm_nregions;
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/* Writing past CONFIG_MM_REGIONS would have catastrophic consequences */
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DEBUGASSERT(IDX < CONFIG_MM_REGIONS);
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if (IDX >= CONFIG_MM_REGIONS)
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{
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return;
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}
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#else
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# define IDX 0
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#endif
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#if defined(CONFIG_MM_SMALL) && !defined(CONFIG_SMALL_MEMORY)
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/* If the MCU handles wide addresses but the memory manager is configured
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* for a small heap, then verify that the caller is not doing something
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* crazy.
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*/
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DEBUGASSERT(heapsize <= MMSIZE_MAX + 1);
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#endif
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/* Register to KASan for access check */
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kasan_register(heapstart, &heapsize);
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ret = mm_takesemaphore(heap);
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DEBUGASSERT(ret);
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/* Adjust the provided heap start and size.
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*
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* Note: (uintptr_t)node + SIZEOF_MM_ALLOCNODE is what's actually
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* returned to the malloc user, which should have natural alignment.
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* (that is, in this implementation, MM_MIN_CHUNK-alignment.)
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*/
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heapbase = MM_ALIGN_UP((uintptr_t)heapstart + 2 * SIZEOF_MM_ALLOCNODE) -
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2 * SIZEOF_MM_ALLOCNODE;
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heapend = MM_ALIGN_DOWN((uintptr_t)heapstart + (uintptr_t)heapsize);
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heapsize = heapend - heapbase;
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#if defined(CONFIG_FS_PROCFS) && \
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!defined(CONFIG_FS_PROCFS_EXCLUDE_MEMINFO) && \
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(defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__))
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minfo("[%s] Region %d: base=%p size=%zu\n",
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heap->mm_procfs.name, IDX + 1, heapstart, heapsize);
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#else
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minfo("Region %d: base=%p size=%zu\n", IDX + 1, heapstart, heapsize);
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#endif
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/* Add the size of this region to the total size of the heap */
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heap->mm_heapsize += heapsize;
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/* Create two "allocated" guard nodes at the beginning and end of
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* the heap. These only serve to keep us from allocating outside
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* of the heap.
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*
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* And create one free node between the guard nodes that contains
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* all available memory.
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*/
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heap->mm_heapstart[IDX] = (FAR struct mm_allocnode_s *)
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heapbase;
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MM_ADD_BACKTRACE(heap, heap->mm_heapstart[IDX]);
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heap->mm_heapstart[IDX]->size = SIZEOF_MM_ALLOCNODE;
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heap->mm_heapstart[IDX]->preceding = MM_ALLOC_BIT;
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node = (FAR struct mm_freenode_s *)
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(heapbase + SIZEOF_MM_ALLOCNODE);
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node->size = heapsize - 2*SIZEOF_MM_ALLOCNODE;
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node->preceding = SIZEOF_MM_ALLOCNODE;
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heap->mm_heapend[IDX] = (FAR struct mm_allocnode_s *)
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(heapend - SIZEOF_MM_ALLOCNODE);
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heap->mm_heapend[IDX]->size = SIZEOF_MM_ALLOCNODE;
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heap->mm_heapend[IDX]->preceding = node->size | MM_ALLOC_BIT;
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MM_ADD_BACKTRACE(heap, heap->mm_heapend[IDX]);
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#undef IDX
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#if CONFIG_MM_REGIONS > 1
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heap->mm_nregions++;
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#endif
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/* Add the single, large free node to the nodelist */
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mm_addfreechunk(heap, node);
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mm_givesemaphore(heap);
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}
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/****************************************************************************
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* Name: mm_initialize
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*
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* Description:
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* Initialize the selected heap data structures, providing the initial
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* heap region.
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*
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* Input Parameters:
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* name - The heap procfs name
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* heap - The selected heap
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* heapstart - Start of the initial heap region
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* heapsize - Size of the initial heap region
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*
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* Returned Value:
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* Return the address of a new heap instance.
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*
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* Assumptions:
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*
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****************************************************************************/
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FAR struct mm_heap_s *mm_initialize(FAR const char *name,
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FAR void *heapstart, size_t heapsize)
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{
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FAR struct mm_heap_s *heap;
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uintptr_t heap_adj;
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int i;
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minfo("Heap: name=%s, start=%p size=%zu\n", name, heapstart, heapsize);
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/* First ensure the memory to be used is aligned */
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heap_adj = MM_ALIGN_UP((uintptr_t)heapstart);
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heapsize -= heap_adj - (uintptr_t)heapstart;
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/* Reserve a block space for mm_heap_s context */
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DEBUGASSERT(heapsize > sizeof(struct mm_heap_s));
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heap = (FAR struct mm_heap_s *)heap_adj;
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heapsize -= sizeof(struct mm_heap_s);
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heapstart = (FAR char *)heap_adj + sizeof(struct mm_heap_s);
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DEBUGASSERT(MM_MIN_CHUNK >= SIZEOF_MM_FREENODE);
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DEBUGASSERT(MM_MIN_CHUNK >= SIZEOF_MM_ALLOCNODE);
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/* Set up global variables */
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memset(heap, 0, sizeof(struct mm_heap_s));
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/* Initialize the node array */
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for (i = 1; i < MM_NNODES; i++)
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{
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heap->mm_nodelist[i - 1].flink = &heap->mm_nodelist[i];
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heap->mm_nodelist[i].blink = &heap->mm_nodelist[i - 1];
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}
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/* Initialize the malloc semaphore to one (to support one-at-
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* a-time access to private data sets).
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*/
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mm_seminitialize(heap);
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#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MEMINFO)
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# if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
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heap->mm_procfs.name = name;
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heap->mm_procfs.heap = heap;
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# ifdef CONFIG_MM_BACKTRACE_DEFAULT
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heap->mm_procfs.backtrace = true;
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# endif
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# endif
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#endif
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/* Add the initial region of memory to the heap */
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mm_addregion(heap, heapstart, heapsize);
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#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MEMINFO)
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# if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
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procfs_register_meminfo(&heap->mm_procfs);
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# endif
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#endif
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return heap;
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}
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/****************************************************************************
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* Name: mm_uninitialize
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*
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* Description:
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* Uninitialize the selected heap data structures.
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*
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* Input Parameters:
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* heap - The heap to uninitialize
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void mm_uninitialize(FAR struct mm_heap_s *heap)
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{
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#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MEMINFO)
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# if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
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procfs_unregister_meminfo(&heap->mm_procfs);
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# endif
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#endif
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mm_semuninitialize(heap);
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}
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