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src/egl/main/eglglobals.c

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+/**************************************************************************
+ *
+ * Copyright 2008 VMware, Inc.
+ * Copyright 2009-2010 Chia-I Wu <[email protected]>
+ * Copyright 2010-2011 LunarG, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "util/simple_mtx.h"
+
+#include "egldevice.h"
+#include "egldisplay.h"
+#include "eglglobals.h"
+
+#include "util/macros.h"
+#include "util/os_misc.h"
+
+#ifdef HAVE_MINCORE
+#include <unistd.h>
+#include <sys/mman.h>
+#endif
+
+static simple_mtx_t _eglGlobalMutex = SIMPLE_MTX_INITIALIZER;
+
+struct _egl_global _eglGlobal = {
+   .Mutex = &_eglGlobalMutex,
+   .DisplayList = NULL,
+   .DeviceList = &_eglSoftwareDevice,
+
+#if USE_LIBGLVND
+   .ClientOnlyExtensionString =
+#else
+   .ClientExtensionString =
+#endif
+      "EGL_EXT_client_extensions"
+#if !DETECT_OS_WINDOWS
+      " EGL_EXT_device_base"
+      " EGL_EXT_device_enumeration"
+      " EGL_EXT_device_query"
+#endif
+      " EGL_EXT_platform_base"
+      " EGL_KHR_client_get_all_proc_addresses"
+      " EGL_KHR_debug"
+
+#if USE_LIBGLVND
+   ,
+   .PlatformExtensionString =
+#else
+      " "
+#endif
+
+#if !DETECT_OS_WINDOWS
+      "EGL_EXT_platform_device"
+      " EGL_EXT_explicit_device"
+#endif
+#ifdef HAVE_WAYLAND_PLATFORM
+      " EGL_EXT_platform_wayland"
+      " EGL_KHR_platform_wayland"
+#endif
+#ifdef HAVE_X11_PLATFORM
+      " EGL_EXT_platform_x11"
+      " EGL_KHR_platform_x11"
+#endif
+#ifdef HAVE_XCB_PLATFORM
+      " EGL_EXT_platform_xcb"
+#endif
+#ifdef HAVE_DRM_PLATFORM
+      " EGL_MESA_platform_gbm"
+      " EGL_KHR_platform_gbm"
+#endif
+      " EGL_MESA_platform_surfaceless"
+      "",
+
+   .debugCallback = NULL,
+   .debugTypesEnabled = _EGL_DEBUG_BIT_CRITICAL | _EGL_DEBUG_BIT_ERROR,
+};
+
+static void
+_eglAtExit(void)
+{
+   _eglFiniDisplay();
+   _eglFiniDevice(); /* always called last */
+}
+
+void
+_eglRegisterAtExit(void)
+{
+   static EGLBoolean registered = EGL_FALSE;
+
+   simple_mtx_lock(_eglGlobal.Mutex);
+
+   if (!registered) {
+      atexit(_eglAtExit);
+      registered = EGL_TRUE;
+   }
+
+   simple_mtx_unlock(_eglGlobal.Mutex);
+}
+
+EGLBoolean
+_eglPointerIsDereferenceable(void *p)
+{
+   uintptr_t addr = (uintptr_t)p;
+   uint64_t page_size = 0;
+   os_get_page_size(&page_size);
+#ifdef HAVE_MINCORE
+   unsigned char valid = 0;
+
+   if (p == NULL)
+      return EGL_FALSE;
+
+   /* align addr to page_size */
+   addr &= ~(page_size - 1);
+
+   /* mincore expects &valid to be unsigned char* on Linux but char* on BSD:
+    * we cast pointers to void, to fix type mismatch warnings in all systems
+    */
+   if (mincore((void *)addr, page_size, (void *)&valid) < 0) {
+      return EGL_FALSE;
+   }
+
+   /* mincore() returns 0 on success, and -1 on failure.  The last parameter
+    * is a vector of bytes with one entry for each page queried.  mincore
+    * returns page residency information in the first bit of each byte in the
+    * vector.
+    *
+    * Residency doesn't actually matter when determining whether a pointer is
+    * dereferenceable, so the output vector can be ignored.  What matters is
+    * whether mincore succeeds. See:
+    *
+    *   http://man7.org/linux/man-pages/man2/mincore.2.html
+    */
+   return EGL_TRUE;
+#else
+   // Without mincore(), we just assume that the first page is unmapped.
+   return addr >= page_size;
+#endif
+}