0d7270333ec0bbb8600ffe9a00efb439916c6763
[mesa.git] / src / egl / main / eglglobals.c
1 /**************************************************************************
2 *
3 * Copyright 2008 VMware, Inc.
4 * Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com>
5 * Copyright 2010-2011 LunarG, Inc.
6 * All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the
10 * "Software"), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sub license, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject to
14 * the following conditions:
15 *
16 * The above copyright notice and this permission notice (including the
17 * next paragraph) shall be included in all copies or substantial portions
18 * of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 * DEALINGS IN THE SOFTWARE.
27 *
28 **************************************************************************/
29
30
31 #include <stdlib.h>
32 #include <stdio.h>
33 #include <string.h>
34 #include <assert.h>
35 #include "c11/threads.h"
36
37 #include "eglglobals.h"
38 #include "egldevice.h"
39 #include "egldisplay.h"
40 #include "egldriver.h"
41 #include "egllog.h"
42
43 #include "util/macros.h"
44
45 #ifdef HAVE_MINCORE
46 #include <unistd.h>
47 #include <sys/mman.h>
48 #endif
49
50
51 static mtx_t _eglGlobalMutex = _MTX_INITIALIZER_NP;
52
53 struct _egl_global _eglGlobal =
54 {
55 .Mutex = &_eglGlobalMutex,
56 .DisplayList = NULL,
57 .DeviceList = &_eglSoftwareDevice,
58 .NumAtExitCalls = 3,
59 .AtExitCalls = {
60 /* default AtExitCalls, called in reverse order */
61 _eglFiniDevice, /* always called last */
62 _eglUnloadDrivers,
63 _eglFiniDisplay,
64 },
65
66 .ClientOnlyExtensionString =
67 "EGL_EXT_client_extensions"
68 " EGL_EXT_device_base"
69 " EGL_EXT_device_enumeration"
70 " EGL_EXT_device_query"
71 " EGL_EXT_platform_base"
72 " EGL_KHR_client_get_all_proc_addresses"
73 " EGL_KHR_debug",
74
75 .PlatformExtensionString =
76 #ifdef HAVE_WAYLAND_PLATFORM
77 " EGL_EXT_platform_wayland"
78 #endif
79 #ifdef HAVE_X11_PLATFORM
80 " EGL_EXT_platform_x11"
81 #endif
82 #ifdef HAVE_DRM_PLATFORM
83 " EGL_MESA_platform_gbm"
84 #endif
85 #ifdef HAVE_SURFACELESS_PLATFORM
86 " EGL_MESA_platform_surfaceless"
87 #endif
88 " EGL_EXT_platform_device"
89 "",
90
91 .ClientExtensionString = NULL,
92
93 .debugCallback = NULL,
94 .debugTypesEnabled = _EGL_DEBUG_BIT_CRITICAL | _EGL_DEBUG_BIT_ERROR,
95 };
96
97
98 static void
99 _eglAtExit(void)
100 {
101 EGLint i;
102 for (i = _eglGlobal.NumAtExitCalls - 1; i >= 0; i--)
103 _eglGlobal.AtExitCalls[i]();
104 }
105
106
107 void
108 _eglAddAtExitCall(void (*func)(void))
109 {
110 if (func) {
111 static EGLBoolean registered = EGL_FALSE;
112
113 mtx_lock(_eglGlobal.Mutex);
114
115 if (!registered) {
116 atexit(_eglAtExit);
117 registered = EGL_TRUE;
118 }
119
120 assert(_eglGlobal.NumAtExitCalls < ARRAY_SIZE(_eglGlobal.AtExitCalls));
121 _eglGlobal.AtExitCalls[_eglGlobal.NumAtExitCalls++] = func;
122
123 mtx_unlock(_eglGlobal.Mutex);
124 }
125 }
126
127 const char *
128 _eglGetClientExtensionString(void)
129 {
130 const char *ret;
131
132 mtx_lock(_eglGlobal.Mutex);
133
134 if (_eglGlobal.ClientExtensionString == NULL) {
135 size_t clientLen = strlen(_eglGlobal.ClientOnlyExtensionString);
136 size_t platformLen = strlen(_eglGlobal.PlatformExtensionString);
137
138 _eglGlobal.ClientExtensionString = (char *) malloc(clientLen + platformLen + 1);
139 if (_eglGlobal.ClientExtensionString != NULL) {
140 char *ptr = _eglGlobal.ClientExtensionString;
141
142 memcpy(ptr, _eglGlobal.ClientOnlyExtensionString, clientLen);
143 ptr += clientLen;
144
145 if (platformLen > 0) {
146 // Note that if PlatformExtensionString is not empty, then it will
147 // already have a leading space.
148 assert(_eglGlobal.PlatformExtensionString[0] == ' ');
149 memcpy(ptr, _eglGlobal.PlatformExtensionString, platformLen);
150 ptr += platformLen;
151 }
152 *ptr = '\0';
153 }
154 }
155 ret = _eglGlobal.ClientExtensionString;
156
157 mtx_unlock(_eglGlobal.Mutex);
158 return ret;
159 }
160
161 EGLBoolean
162 _eglPointerIsDereferencable(void *p)
163 {
164 #ifdef HAVE_MINCORE
165 uintptr_t addr = (uintptr_t) p;
166 unsigned char valid = 0;
167 const long page_size = getpagesize();
168
169 if (p == NULL)
170 return EGL_FALSE;
171
172 /* align addr to page_size */
173 addr &= ~(page_size - 1);
174
175 if (mincore((void *) addr, page_size, &valid) < 0) {
176 _eglLog(_EGL_DEBUG, "mincore failed: %m");
177 return EGL_FALSE;
178 }
179
180 /* mincore() returns 0 on success, and -1 on failure. The last parameter
181 * is a vector of bytes with one entry for each page queried. mincore
182 * returns page residency information in the first bit of each byte in the
183 * vector.
184 *
185 * Residency doesn't actually matter when determining whether a pointer is
186 * dereferenceable, so the output vector can be ignored. What matters is
187 * whether mincore succeeds. See:
188 *
189 * http://man7.org/linux/man-pages/man2/mincore.2.html
190 */
191 return EGL_TRUE;
192 #else
193 return p != NULL;
194 #endif
195 }