• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /**************************************************************************
2  *
3  * Copyright (C) 1999 Wittawat Yamwong
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the "Software"),
7  * to deal in the Software without restriction, including without limitation
8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9  * and/or sell copies of the Software, and to permit persons to whom the
10  * Software is furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice shall be included
13  * in all copies or substantial portions of the Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * KEITH WHITWELL, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
21  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22  *
23  **************************************************************************/
24 
25 
26 /**
27  * @file
28  * Memory manager code.  Primarily used by device drivers to manage texture
29  * heaps, etc.
30  */
31 
32 
33 #ifndef _U_MM_H_
34 #define _U_MM_H_
35 
36 
37 struct mem_block {
38    struct mem_block *next, *prev;
39    struct mem_block *next_free, *prev_free;
40    struct mem_block *heap;
41    int ofs,size;
42    unsigned int free:1;
43    unsigned int reserved:1;
44 };
45 
46 
47 
48 /**
49  * input: total size in bytes
50  * return: a heap pointer if OK, NULL if error
51  */
52 extern struct mem_block *u_mmInit(int ofs, int size);
53 
54 /**
55  * Allocate 'size' bytes with 2^align2 bytes alignment,
56  * restrict the search to free memory after 'startSearch'
57  * depth and back buffers should be in different 4mb banks
58  * to get better page hits if possible
59  * input:	size = size of block
60  *       	align2 = 2^align2 bytes alignment
61  *		startSearch = linear offset from start of heap to begin search
62  * return: pointer to the allocated block, 0 if error
63  */
64 extern struct mem_block *u_mmAllocMem(struct mem_block *heap, int size, int align2,
65                             int startSearch);
66 
67 /**
68  * Free block starts at offset
69  * input: pointer to a block
70  * return: 0 if OK, -1 if error
71  */
72 extern int u_mmFreeMem(struct mem_block *b);
73 
74 /**
75  * Free block starts at offset
76  * input: pointer to a heap, start offset
77  * return: pointer to a block
78  */
79 extern struct mem_block *u_mmFindBlock(struct mem_block *heap, int start);
80 
81 /**
82  * destroy MM
83  */
84 extern void u_mmDestroy(struct mem_block *mmInit);
85 
86 /**
87  * For debugging purposes.
88  */
89 extern void u_mmDumpMemInfo(const struct mem_block *mmInit);
90 
91 #endif
92