Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | RSS feed

  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.