src/mesa/main/mm.h

   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 #include "imports.h"
  36
  37
  38 struct mem_block {
  39    struct mem_block *next, *prev;
  40    struct mem_block *next_free, *prev_free;
  41    struct mem_block *heap;
  42    unsigned ofs;
  43    unsigned size;
  44    unsigned free:1;
  45    unsigned reserved:1;
  46 };
  47
  48
  49
  50 /**
  51  * input: total size in bytes
  52  * return: a heap pointer if OK, NULL if error
  53  */
  54 extern struct mem_block *mmInit(unsigned ofs, unsigned size);
  55
  56 /**
  57  * Allocate 'size' bytes with 2^align2 bytes alignment,
  58  * restrict the search to free memory after 'startSearch'
  59  * depth and back buffers should be in different 4mb banks
  60  * to get better page hits if possible
  61  * input:       size = size of block
  62  *              align2 = 2^align2 bytes alignment
  63  *              startSearch = linear offset from start of heap to begin search
  64  * return: pointer to the allocated block, 0 if error
  65  */
  66 extern struct mem_block *mmAllocMem(struct mem_block *heap, unsigned size,
  67                                     unsigned align2, unsigned startSearch);
  68
  69 /**
  70  * Free block starts at offset
  71  * input: pointer to a block
  72  * return: 0 if OK, -1 if error
  73  */
  74 extern int mmFreeMem(struct mem_block *b);
  75
  76 /**
  77  * Free block starts at offset
  78  * input: pointer to a heap, start offset
  79  * return: pointer to a block
  80  */
  81 extern struct mem_block *mmFindBlock(struct mem_block *heap, unsigned start);
  82
  83 /**
  84  * destroy MM
  85  */
  86 extern void mmDestroy(struct mem_block *mmInit);
  87
  88 /**
  89  * For debuging purpose.
  90  */
  91 extern void mmDumpMemInfo(const struct mem_block *mmInit);
  92
  93 #endif