src/mesa/main/execmem.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /**
  27  * \file exemem.c
  28  * Functions for allocating executable memory.
  29  *
  30  * \author Keith Whitwell
  31  */
  32
  33
  34 #include "imports.h"
  35 #include "glapi/glthread.h"
  36
  37
  38
  39 #if defined(__linux__)
  40
  41 /*
  42  * Allocate a large block of memory which can hold code then dole it out
  43  * in pieces by means of the generic memory manager code.
  44 */
  45
  46 #include <unistd.h>
  47 #include <sys/mman.h>
  48 #include "mm.h"
  49
  50 #define EXEC_HEAP_SIZE (10*1024*1024)
  51
  52 _glthread_DECLARE_STATIC_MUTEX(exec_mutex);
  53
  54 static struct mem_block *exec_heap = NULL;
  55 static unsigned char *exec_mem = NULL;
  56
  57
  58 static void
  59 init_heap(void)
  60 {
  61    if (!exec_heap)
  62       exec_heap = mmInit( 0, EXEC_HEAP_SIZE );
  63
  64    if (!exec_mem)
  65       exec_mem = (unsigned char *) mmap(0, EXEC_HEAP_SIZE,
  66                                         PROT_EXEC | PROT_READ | PROT_WRITE,
  67                                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  68 }
  69
  70
  71 void *
  72 _mesa_exec_malloc(GLuint size)
  73 {
  74    struct mem_block *block = NULL;
  75    void *addr = NULL;
  76
  77    _glthread_LOCK_MUTEX(exec_mutex);
  78
  79    init_heap();
  80
  81    if (exec_heap) {
  82       size = (size + 31) & ~31;
  83       block = mmAllocMem( exec_heap, size, 32, 0 );
  84    }
  85
  86    if (block)
  87       addr = exec_mem + block->ofs;
  88    else
  89       _mesa_printf("_mesa_exec_malloc failed\n");
  90
  91    _glthread_UNLOCK_MUTEX(exec_mutex);
  92
  93    return addr;
  94 }
  95
  96
  97 void
  98 _mesa_exec_free(void *addr)
  99 {
 100    _glthread_LOCK_MUTEX(exec_mutex);
 101
 102    if (exec_heap) {
 103       struct mem_block *block = mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
 104
 105       if (block)
 106          mmFreeMem(block);
 107    }
 108
 109    _glthread_UNLOCK_MUTEX(exec_mutex);
 110 }
 111
 112
 113 #else
 114
 115 /*
 116  * Just use regular memory.
 117  */
 118
 119 void *
 120 _mesa_exec_malloc(GLuint size)
 121 {
 122    return _mesa_malloc( size );
 123 }
 124
 125
 126 void
 127 _mesa_exec_free(void *addr)
 128 {
 129    _mesa_free(addr);
 130 }
 131
 132
 133 #endif