reactos/lib/mesa32/src/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 "glthread.h"
  36
  37
  38
  39 #if defined(__linux__) && !defined(XFree86Server)
  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
  47 #include <unistd.h>
  48 #include <sys/mman.h>
  49 #include "mm.h"
  50
  51 #define EXEC_HEAP_SIZE (128*1024)
  52
  53 _glthread_DECLARE_STATIC_MUTEX(exec_mutex);
  54
  55 static memHeap_t *exec_heap = NULL;
  56 static unsigned char *exec_mem = NULL;
  57
  58
  59 static void
  60 init_heap(void)
  61 {
  62    if (!exec_heap)
  63       exec_heap = mmInit( 0, EXEC_HEAP_SIZE );
  64
  65    if (!exec_mem)
  66       exec_mem = (unsigned char *) mmap(0, EXEC_HEAP_SIZE,
  67                                         PROT_EXEC | PROT_READ | PROT_WRITE,
  68                                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  69 }
  70
  71
  72 void *
  73 _mesa_exec_malloc(GLuint size)
  74 {
  75    PMemBlock block = NULL;
  76    void *addr = NULL;
  77
  78    _glthread_LOCK_MUTEX(exec_mutex);
  79
  80    init_heap();
  81
  82    if (exec_heap) {
  83       size = (size + 31) & ~31;
  84       block = mmAllocMem( exec_heap, size, 32, 0 );
  85    }
  86
  87    if (block)
  88       addr = exec_mem + block->ofs;
  89
  90    _glthread_UNLOCK_MUTEX(exec_mutex);
  91
  92    return addr;
  93 }
  94
  95
  96 void
  97 _mesa_exec_free(void *addr)
  98 {
  99    _glthread_LOCK_MUTEX(exec_mutex);
 100
 101    if (exec_heap) {
 102       PMemBlock block = mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
 103
 104       if (block)
 105          mmFreeMem(block);
 106    }
 107
 108    _glthread_UNLOCK_MUTEX(exec_mutex);
 109 }
 110
 111
 112 #else
 113
 114 /*
 115  * Just use regular memory.
 116  */
 117
 118 void *
 119 _mesa_exec_malloc(GLuint size)
 120 {
 121    return _mesa_malloc( size );
 122 }
 123
 124
 125 void
 126 _mesa_exec_free(void *addr)
 127 {
 128    _mesa_free(addr);
 129 }
 130
 131
 132 #endif