176 lines
4.6 KiB
C
176 lines
4.6 KiB
C
/**************************************************************************
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*
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* Copyright 2008 VMware, Inc.
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* Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com>
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* Copyright 2010-2011 LunarG, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include "c11/threads.h"
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#include "eglglobals.h"
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#include "egldevice.h"
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#include "egldisplay.h"
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#include "util/macros.h"
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#include "util/os_misc.h"
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#ifdef HAVE_MINCORE
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#include <unistd.h>
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#include <sys/mman.h>
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#endif
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static mtx_t _eglGlobalMutex = _MTX_INITIALIZER_NP;
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struct _egl_global _eglGlobal =
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{
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.Mutex = &_eglGlobalMutex,
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.DisplayList = NULL,
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.DeviceList = &_eglSoftwareDevice,
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.NumAtExitCalls = 2,
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.AtExitCalls = {
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/* default AtExitCalls, called in reverse order */
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_eglFiniDevice, /* always called last */
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_eglFiniDisplay,
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},
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#if USE_LIBGLVND
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.ClientOnlyExtensionString =
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#else
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.ClientExtensionString =
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#endif
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"EGL_EXT_client_extensions"
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" EGL_EXT_device_base"
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" EGL_EXT_device_enumeration"
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" EGL_EXT_device_query"
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" EGL_EXT_platform_base"
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" EGL_KHR_client_get_all_proc_addresses"
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" EGL_KHR_debug"
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#if USE_LIBGLVND
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,
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.PlatformExtensionString =
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#else
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" "
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#endif
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"EGL_EXT_platform_device"
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#ifdef HAVE_WAYLAND_PLATFORM
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" EGL_EXT_platform_wayland"
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" EGL_KHR_platform_wayland"
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#endif
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#ifdef HAVE_X11_PLATFORM
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" EGL_EXT_platform_x11"
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" EGL_KHR_platform_x11"
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#endif
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#ifdef HAVE_XCB_PLATFORM
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" EGL_EXT_platform_xcb"
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#endif
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#ifdef HAVE_DRM_PLATFORM
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" EGL_MESA_platform_gbm"
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" EGL_KHR_platform_gbm"
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#endif
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" EGL_MESA_platform_surfaceless"
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"",
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.debugCallback = NULL,
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.debugTypesEnabled = _EGL_DEBUG_BIT_CRITICAL | _EGL_DEBUG_BIT_ERROR,
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};
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static void
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_eglAtExit(void)
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{
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EGLint i;
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for (i = _eglGlobal.NumAtExitCalls - 1; i >= 0; i--)
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_eglGlobal.AtExitCalls[i]();
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}
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void
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_eglAddAtExitCall(void (*func)(void))
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{
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if (func) {
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static EGLBoolean registered = EGL_FALSE;
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mtx_lock(_eglGlobal.Mutex);
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if (!registered) {
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atexit(_eglAtExit);
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registered = EGL_TRUE;
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}
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assert(_eglGlobal.NumAtExitCalls < ARRAY_SIZE(_eglGlobal.AtExitCalls));
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_eglGlobal.AtExitCalls[_eglGlobal.NumAtExitCalls++] = func;
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mtx_unlock(_eglGlobal.Mutex);
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}
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}
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EGLBoolean
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_eglPointerIsDereferencable(void *p)
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{
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uintptr_t addr = (uintptr_t) p;
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uint64_t page_size = 0;
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os_get_page_size(&page_size);
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#ifdef HAVE_MINCORE
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unsigned char valid = 0;
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if (p == NULL)
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return EGL_FALSE;
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/* align addr to page_size */
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addr &= ~(page_size - 1);
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/* mincore expects &valid to be unsigned char* on Linux but char* on BSD:
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* we cast pointers to void, to fix type mismatch warnings in all systems
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*/
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if (mincore((void *) addr, page_size, (void*)&valid) < 0) {
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return EGL_FALSE;
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}
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/* mincore() returns 0 on success, and -1 on failure. The last parameter
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* is a vector of bytes with one entry for each page queried. mincore
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* returns page residency information in the first bit of each byte in the
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* vector.
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*
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* Residency doesn't actually matter when determining whether a pointer is
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* dereferenceable, so the output vector can be ignored. What matters is
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* whether mincore succeeds. See:
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*
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* http://man7.org/linux/man-pages/man2/mincore.2.html
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*/
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return EGL_TRUE;
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#else
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// Without mincore(), we just assume that the first page is unmapped.
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return addr >= page_size;
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#endif
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}
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