src/mesa/drivers/dri/common/mm.h

   1 /*
   2  * GLX Hardware Device Driver common code
   3  * Copyright (C) 1999 Keith Whitwell
   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 #ifndef MM_INC
  26 #define MM_INC
  27
  28 struct mem_block_t {
  29   struct mem_block_t *next;
  30   struct mem_block_t *heap;
  31   int ofs,size;
  32   int align;
  33   int free:1;
  34   int reserved:1;
  35 };
  36 typedef struct mem_block_t TMemBlock;
  37 typedef struct mem_block_t *PMemBlock;
  38
  39 /* a heap is just the first block in a chain */
  40 typedef struct mem_block_t memHeap_t;
  41
  42 static __inline__ int mmBlockSize(PMemBlock b)
  43 { return b->size; }
  44
  45 static __inline__ int mmOffset(PMemBlock b)
  46 { return b->ofs; }
  47
  48 /*
  49  * input: total size in bytes
  50  * return: a heap pointer if OK, NULL if error
  51  */
  52 memHeap_t *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 PMemBlock  mmAllocMem( memHeap_t *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 int  mmFreeMem( PMemBlock b );
  73
  74 /*
  75  * destroy MM
  76  */
  77 void mmDestroy( memHeap_t *mmInit );
  78
  79 /* For debuging purpose. */
  80 void mmDumpMemInfo( memHeap_t *mmInit );
  81
  82 #endif