execmem.c revision 7117f1b4 
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__)
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
54static struct mem_block *exec_heap = NULL;
55static unsigned char *exec_mem = NULL;
56
57
58static void
59init_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
71void *
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
97void
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
119void *
120_mesa_exec_malloc(GLuint size)
121{
122   return _mesa_malloc( size );
123}
124
125
126void
127_mesa_exec_free(void *addr)
128{
129   _mesa_free(addr);
130}
131
132
133#endif
134