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