| /************************************************************************** |
| * |
| * Copyright 2008 VMware, Inc. |
| * Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com> |
| * 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 <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <assert.h> |
| #include "c11/threads.h" |
| |
| #include "eglglobals.h" |
| #include "egldevice.h" |
| #include "egldisplay.h" |
| |
| #include "util/macros.h" |
| |
| #ifdef HAVE_MINCORE |
| #include <unistd.h> |
| #include <sys/mman.h> |
| #endif |
| |
| |
| static mtx_t _eglGlobalMutex = _MTX_INITIALIZER_NP; |
| |
| struct _egl_global _eglGlobal = |
| { |
| .Mutex = &_eglGlobalMutex, |
| .DisplayList = NULL, |
| .DeviceList = &_eglSoftwareDevice, |
| .NumAtExitCalls = 2, |
| .AtExitCalls = { |
| /* default AtExitCalls, called in reverse order */ |
| _eglFiniDevice, /* always called last */ |
| _eglFiniDisplay, |
| }, |
| |
| #if USE_LIBGLVND |
| .ClientOnlyExtensionString = |
| #else |
| .ClientExtensionString = |
| #endif |
| "EGL_EXT_client_extensions" |
| " EGL_EXT_device_base" |
| " EGL_EXT_device_enumeration" |
| " EGL_EXT_device_query" |
| " EGL_EXT_platform_base" |
| " EGL_KHR_client_get_all_proc_addresses" |
| " EGL_KHR_debug" |
| |
| #if USE_LIBGLVND |
| , |
| .PlatformExtensionString = |
| #else |
| " " |
| #endif |
| |
| "EGL_EXT_platform_device" |
| #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_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) |
| { |
| EGLint i; |
| for (i = _eglGlobal.NumAtExitCalls - 1; i >= 0; i--) |
| _eglGlobal.AtExitCalls[i](); |
| } |
| |
| |
| void |
| _eglAddAtExitCall(void (*func)(void)) |
| { |
| if (func) { |
| static EGLBoolean registered = EGL_FALSE; |
| |
| mtx_lock(_eglGlobal.Mutex); |
| |
| if (!registered) { |
| atexit(_eglAtExit); |
| registered = EGL_TRUE; |
| } |
| |
| assert(_eglGlobal.NumAtExitCalls < ARRAY_SIZE(_eglGlobal.AtExitCalls)); |
| _eglGlobal.AtExitCalls[_eglGlobal.NumAtExitCalls++] = func; |
| |
| mtx_unlock(_eglGlobal.Mutex); |
| } |
| } |
| |
| EGLBoolean |
| _eglPointerIsDereferencable(void *p) |
| { |
| uintptr_t addr = (uintptr_t) p; |
| const long page_size = getpagesize(); |
| #ifdef HAVE_MINCORE |
| unsigned char valid = 0; |
| |
| if (p == NULL) |
| return EGL_FALSE; |
| |
| /* align addr to page_size */ |
| addr &= ~(page_size - 1); |
| |
| if (mincore((void *) addr, page_size, &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 |
| } |