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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.