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1 /*
2  * GLX Hardware Device Driver common code
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  * Memory manager code.  Primarily used by device drivers to manage texture
27  * heaps, etc.
28  */
29 
30 
31 #ifndef MM_H
32 #define MM_H
33 
34 
35 struct mem_block {
36    struct mem_block *next, *prev;
37    struct mem_block *next_free, *prev_free;
38    struct mem_block *heap;
39    unsigned ofs;
40    unsigned size;
41    unsigned free:1;
42    unsigned reserved:1;
43 };
44 
45 
46 
47 /**
48  * input: total size in bytes
49  * return: a heap pointer if OK, NULL if error
50  */
51 extern struct mem_block *mmInit(unsigned ofs, unsigned size);
52 
53 /**
54  * Allocate 'size' bytes with 2^align2 bytes alignment,
55  * restrict the search to free memory after 'startSearch'
56  * depth and back buffers should be in different 4mb banks
57  * to get better page hits if possible
58  * input:	size = size of block
59  *       	align2 = 2^align2 bytes alignment
60  *		startSearch = linear offset from start of heap to begin search
61  * return: pointer to the allocated block, 0 if error
62  */
63 extern struct mem_block *mmAllocMem(struct mem_block *heap, unsigned size,
64                                     unsigned align2, unsigned startSearch);
65 
66 /**
67  * Free block starts at offset
68  * input: pointer to a block
69  * return: 0 if OK, -1 if error
70  */
71 extern int mmFreeMem(struct mem_block *b);
72 
73 /**
74  * Free block starts at offset
75  * input: pointer to a heap, start offset
76  * return: pointer to a block
77  */
78 extern struct mem_block *mmFindBlock(struct mem_block *heap, unsigned start);
79 
80 /**
81  * destroy MM
82  */
83 extern void mmDestroy(struct mem_block *mmInit);
84 
85 /**
86  * For debuging purpose.
87  */
88 extern void mmDumpMemInfo(const struct mem_block *mmInit);
89 
90 #endif
91