211 lines
7.0 KiB
C
211 lines
7.0 KiB
C
/************************************************************
|
|
* mm_internal.h
|
|
*
|
|
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
************************************************************/
|
|
|
|
#ifndef __MM_INTERNAL_H
|
|
#define __MM_INTERNAL_H
|
|
|
|
/************************************************************
|
|
* Included Files
|
|
************************************************************/
|
|
|
|
/************************************************************
|
|
* Definitions
|
|
************************************************************/
|
|
|
|
/* These definitions define the characteristics of allocator
|
|
*
|
|
* MM_MIN_SHIFT is used to define MM_MIN_CHUNK.
|
|
* MM_MIN_CHUNK - is the smallest physical chunk that can
|
|
* be allocated. It must be at least a large as
|
|
* sizeof(struct mm_freenode_s). Larger values may
|
|
* improve performance slightly, but will waste memory
|
|
* due to quantization losses.
|
|
*
|
|
* MM_MAX_SHIFT is used to define MM_MAX_CHUNK
|
|
* MM_MAX_CHUNK is the largest, contiguous chunk of memory
|
|
* that can be allocated. It can range from 16-bytes to
|
|
* 4Gb. Larger values of MM_MAX_SHIFT can cause larger
|
|
* data structure sizes and, perhaps, minor performance
|
|
* losses.
|
|
*/
|
|
|
|
#ifdef CONFIG_SMALL_MEMORY
|
|
# define MM_MIN_SHIFT 4 /* 16 bytes */
|
|
# define MM_MAX_SHIFT 15 /* 32 Kb */
|
|
#else
|
|
# define MM_MIN_SHIFT 4 /* 16 bytes */
|
|
# define MM_MAX_SHIFT 22 /* 4 Mb */
|
|
#endif
|
|
|
|
/* All other definitions derive from these two */
|
|
|
|
#define MM_MIN_CHUNK (1 << MM_MIN_SHIFT)
|
|
#define MM_MAX_CHUNK (1 << MM_MAX_SHIFT)
|
|
#define MM_NNODES (MM_MAX_SHIFT - MM_MIN_SHIFT + 1)
|
|
|
|
#define MM_GRAN_MASK (MM_MIN_CHUNK-1)
|
|
#define MM_ALIGN_UP(a) (((a) + MM_GRAN_MASK) & ~MM_GRAN_MASK)
|
|
#define MM_ALIGN_DOWN(a) ((a) & ~MM_GRAN_MASK)
|
|
|
|
/* An allocated chunk is distinguished from a free chunk by
|
|
* bit 31 of the 'preceding' chunk size. If set, then this is
|
|
* an allocated chunk.
|
|
*/
|
|
|
|
#ifdef CONFIG_SMALL_MEMORY
|
|
# define MM_ALLOC_BIT 0x8000
|
|
#else
|
|
# define MM_ALLOC_BIT 0x80000000
|
|
#endif
|
|
#define MM_IS_ALLOCATED(n) \
|
|
((int)((struct mm_allocnode_s*)(n)->preceding) < 0))
|
|
|
|
/************************************************************
|
|
* Public Types
|
|
************************************************************/
|
|
|
|
/* This describes an allocated chunk. An allocated chunk is
|
|
* distinguished from a free chunk by bit 31 of the 'precding'
|
|
* chunk size. If set, then this is an allocated chunk.
|
|
*/
|
|
|
|
struct mm_allocnode_s
|
|
{
|
|
size_t size; /* Size of this chunk */
|
|
size_t preceding; /* Size of the preceding chunk */
|
|
};
|
|
|
|
#ifdef CONFIG_SMALL_MEMORY
|
|
# define SIZEOF_MM_ALLOCNODE 4
|
|
#else
|
|
# define SIZEOF_MM_ALLOCNODE 8
|
|
#endif
|
|
|
|
#define CHECK_ALLOCNODE_SIZE \
|
|
DEBUGASSERT(sizeof(struct mm_allocnode_s) == SIZEOF_MM_ALLOCNODE)
|
|
|
|
/* This describes a free chunk */
|
|
|
|
struct mm_freenode_s
|
|
{
|
|
size_t size; /* Size of this chunk */
|
|
size_t preceding; /* Size of the preceding chunk */
|
|
FAR struct mm_freenode_s *flink; /* Supports a doubly linked list */
|
|
FAR struct mm_freenode_s *blink;
|
|
};
|
|
|
|
#ifdef CONFIG_SMALL_MEMORY
|
|
# define SIZEOF_MM_FREENODE 8
|
|
#else
|
|
# define SIZEOF_MM_FREENODE 16
|
|
#endif
|
|
#define CHECK_FREENODE_SIZE \
|
|
DEBUGASSERT(sizeof(struct mm_freenode_s) == SIZEOF_MM_FREENODE)
|
|
|
|
/* Normally defined in stdlib.h */
|
|
|
|
#ifdef MM_TEST
|
|
struct mallinfo
|
|
{
|
|
int arena; /* This is the total size of memory allocated
|
|
* for use by malloc in bytes. */
|
|
int ordblks; /* This is the number of free (not in use) chunks */
|
|
int mxordblk; /* Size of the largest free (not in use) chunk */
|
|
int uordblks; /* This is the total size of memory occupied by
|
|
* chunks handed out by malloc. */
|
|
int fordblks; /* This is the total size of memory occupied
|
|
* by free (not in use) chunks.*/
|
|
};
|
|
#endif
|
|
|
|
/************************************************************
|
|
* Global Variables
|
|
************************************************************/
|
|
|
|
/* This is the size of the heap provided to mm */
|
|
|
|
extern size_t g_heapsize;
|
|
|
|
/* This is the first and last nodes of the heap */
|
|
|
|
extern FAR struct mm_allocnode_s *g_heapstart[CONFIG_MM_REGIONS];
|
|
extern FAR struct mm_allocnode_s *g_heapend[CONFIG_MM_REGIONS];
|
|
|
|
#if CONFIG_MM_REGIONS > 1
|
|
extern int g_nregions;
|
|
#else
|
|
# define g_nregions 1
|
|
#endif
|
|
|
|
/* All free nodes are maintained in a doubly linked list. This
|
|
* array provides some hooks into the list at various points to
|
|
* speed searches for free nodes.
|
|
*/
|
|
|
|
extern FAR struct mm_freenode_s g_nodelist[MM_NNODES];
|
|
|
|
/************************************************************
|
|
* Pulblic Function Prototypes
|
|
************************************************************/
|
|
|
|
/* Normally defined in malloc.h */
|
|
|
|
#ifdef MM_TEST
|
|
extern FAR void *mm_malloc(size_t);
|
|
extern void mm_free(void*);
|
|
extern FAR void *mm_realloc(void*, size_t);
|
|
extern FAR void *mm_memalign(size_t, size_t);
|
|
extern FAR void *mm_zalloc(size_t);
|
|
extern FAR void *mm_calloc(size_t, size_t);
|
|
#ifdef CONFIG_CAN_PASS_STRUCTS
|
|
extern struct mallinfo mallinfo(void);
|
|
#else
|
|
extern int mallinfo(struct mallinfo *info);
|
|
#endif
|
|
#endif
|
|
|
|
extern void mm_shrinkchunk(FAR struct mm_allocnode_s *node,
|
|
size_t size);
|
|
extern void mm_addfreechunk(FAR struct mm_freenode_s *node);
|
|
extern int mm_size2ndx(size_t size);
|
|
extern void mm_seminitialize(void);
|
|
extern void mm_takesemaphore(void);
|
|
extern void mm_givesemaphore(void);
|
|
#ifdef MM_TEST
|
|
extern int mm_getsemaphore(void);
|
|
#endif
|
|
|
|
#endif /* __MM_INTERNAL_H */
|