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diff --git a/src/VBox/Additions/x11/vboxvideo/VBoxVideoIPRT.h b/src/VBox/Additions/x11/vboxvideo/VBoxVideoIPRT.h
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+++ b/src/VBox/Additions/x11/vboxvideo/VBoxVideoIPRT.h
@@ -0,0 +1,243 @@
+/* $Id: VBoxVideoIPRT.h $ */
+/*
+ * Copyright (C) 2017-2023 Oracle and/or its affiliates.
+ *
+ * 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, sublicense, 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 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.
+ */
+
+/* In builds inside of the VirtualBox source tree we override the default
+ * VBoxVideoIPRT.h using -include, therefore this define must match the one
+ * there. */
+
+#ifndef VBOX_INCLUDED_Graphics_VBoxVideoIPRT_h
+#define VBOX_INCLUDED_Graphics_VBoxVideoIPRT_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+# include "VBoxVideoErr.h"
+
+#ifndef __cplusplus
+typedef enum
+{
+ false = 0,
+ true
+} bool;
+# define RT_C_DECLS_BEGIN
+# define RT_C_DECLS_END
+#else
+# define RT_C_DECLS_BEGIN extern "C" {
+# define RT_C_DECLS_END }
+#endif
+
+#if defined(IN_XF86_MODULE) && !defined(NO_ANSIC)
+# ifdef __cplusplus
+/* xf86Module.h redefines this. */
+# define NULL 0
+# endif
+RT_C_DECLS_BEGIN
+# include "xf86_ansic.h"
+RT_C_DECLS_END
+#endif /* defined(IN_XF86_MODULE) && !defined(NO_ANSIC) */
+#define __STDC_LIMIT_MACROS /* define *INT*_MAX on C++ too. */
+#include "compiler.h" /* Can pull in <sdtint.h>. Must come after xf86_ansic.h on XFree86. */
+#include <X11/Xfuncproto.h>
+#include <stdint.h>
+#if defined(IN_XF86_MODULE) && !defined(NO_ANSIC)
+# ifndef offsetof
+# define offsetof(type, member) ( (int)(uintptr_t)&( ((type *)(void *)0)->member) )
+# endif
+#else /* !(defined(IN_XF86_MODULE) && !defined(NO_ANSIC)) */
+# include <stdarg.h>
+# include <stddef.h>
+# include <string.h>
+#endif /* !(defined(IN_XF86_MODULE) && !defined(NO_ANSIC)) */
+
+/* XFree86 (and newer Xfuncproto.h) do not have these. Not that I care much for micro-optimisations
+ * in most cases anyway. */
+#ifndef _X_LIKELY
+# define _X_LIKELY(x) (x)
+#endif
+#ifndef _X_UNLIKELY
+# define _X_UNLIKELY(x) (x)
+#endif
+
+RT_C_DECLS_BEGIN
+extern int RTASSERTVAR[1];
+RT_C_DECLS_END
+
+#define AssertCompile(expr) \
+ extern int RTASSERTVAR[1] __attribute__((__unused__)), \
+ RTASSERTVAR[(expr) ? 1 : 0] __attribute__((__unused__))
+#define AssertCompileSize(type, size) \
+ AssertCompile(sizeof(type) == (size))
+#define AssertPtrNullReturnVoid(a) do { } while(0)
+
+#if !defined(IN_XF86_MODULE) && defined(DEBUG)
+# include <assert.h>
+# define Assert assert
+# define AssertFailed() assert(0)
+# define AssertMsg(expr, msg) \
+ do { \
+ if (!(expr)) xf86ErrorF msg; \
+ assert((expr)); \
+ } while (0)
+# define AssertPtr assert
+# define AssertPtrReturn(pv, rcRet) do { assert(pv); if (pv) {} else return(rcRet); } while(0)
+# define AssertRC(expr) assert (!expr)
+#else
+# define Assert(expr) do { } while(0)
+# define AssertFailed() do { } while(0)
+# define AssertMsg(expr, msg) do { } while(0)
+# define AssertPtr(ptr) do { } while(0)
+# define AssertPtrReturn(pv, rcRet) do { if (pv) {} else return(rcRet); } while(0)
+# define AssertRC(expr) do { } while(0)
+#endif
+
+#define DECLCALLBACK(a_RetType) a_RetType
+#define DECLCALLBACKTYPE(a_RetType, a_Name, a_Args) a_RetType a_Name a_Args
+#define DECLCALLBACKMEMBER(a_RetType, a_Name, a_Args) a_RetType (*a_Name) a_Args
+#if __GNUC__ >= 4
+# define DECLHIDDEN(type) __attribute__((visibility("hidden"))) type
+#else
+# define DECLHIDDEN(type) type
+#endif
+#define DECLINLINE(type) static __inline__ type
+
+#define _1K 1024
+#define ASMCompilerBarrier mem_barrier
+#define RT_BIT(bit) ( 1U << (bit) )
+#define RT_BOOL(Value) ( !!(Value) )
+#define RT_BZERO(pv, cb) do { memset((pv), 0, cb); } while (0)
+#define RT_CLAMP(Value, Min, Max) ( (Value) > (Max) ? (Max) : (Value) < (Min) ? (Min) : (Value) )
+#define RT_ELEMENTS(aArray) ( sizeof(aArray) / sizeof((aArray)[0]) )
+#define RTIOPORT unsigned short
+#define RT_NOREF(...) (void)(__VA_ARGS__)
+#define RT_OFFSETOF(type, member) offsetof(type, member)
+#define RT_UOFFSETOF(type, member) offsetof(type, member)
+#define RT_ZERO(Obj) RT_BZERO(&(Obj), sizeof(Obj))
+#define RT_VALID_PTR(ptr) ( (uintptr_t)(ptr) + 0x1000U >= 0x2000U )
+#ifndef INT16_C
+# define INT16_C(Value) (Value)
+#endif
+#ifndef UINT16_C
+# define UINT16_C(Value) (Value)
+#endif
+#ifndef INT32_C
+# define INT32_C(Value) (Value ## U)
+#endif
+#ifndef UINT32_C
+# define UINT32_C(Value) (Value ## U)
+#endif
+#define RT_UNTRUSTED_GUEST
+#define RT_UNTRUSTED_VOLATILE_GUEST volatile
+#define RT_UNTRUSTED_HOST
+#define RT_UNTRUSTED_VOLATILE_HOST volatile
+#define RT_UNTRUSTED_HSTGST
+#define RT_UNTRUSTED_VOLATILE_HSTGST volatile
+
+#define likely _X_LIKELY
+#define unlikely _X_UNLIKELY
+
+/**
+ * A point in a two dimentional coordinate system.
+ */
+typedef struct RTPOINT
+{
+ /** X coordinate. */
+ int32_t x;
+ /** Y coordinate. */
+ int32_t y;
+} RTPOINT;
+
+/**
+ * Rectangle data type, double point.
+ */
+typedef struct RTRECT
+{
+ /** left X coordinate. */
+ int32_t xLeft;
+ /** top Y coordinate. */
+ int32_t yTop;
+ /** right X coordinate. (exclusive) */
+ int32_t xRight;
+ /** bottom Y coordinate. (exclusive) */
+ int32_t yBottom;
+} RTRECT;
+
+/**
+ * Rectangle data type, point + size.
+ */
+typedef struct RTRECT2
+{
+ /** X coordinate.
+ * Unless stated otherwise, this is the top left corner. */
+ int32_t x;
+ /** Y coordinate.
+ * Unless stated otherwise, this is the top left corner. */
+ int32_t y;
+ /** The width.
+ * Unless stated otherwise, this is to the right of (x,y) and will not
+ * be a negative number. */
+ int32_t cx;
+ /** The height.
+ * Unless stated otherwise, this is down from (x,y) and will not be a
+ * negative number. */
+ int32_t cy;
+} RTRECT2;
+
+/**
+ * The size of a rectangle.
+ */
+typedef struct RTRECTSIZE
+{
+ /** The width (along the x-axis). */
+ uint32_t cx;
+ /** The height (along the y-axis). */
+ uint32_t cy;
+} RTRECTSIZE;
+
+/** @name Port I/O helpers
+ * @{ */
+
+/** Write an 8-bit value to an I/O port. */
+#define VBVO_PORT_WRITE_U8(Port, Value) \
+ outb(Port, Value)
+/** Write a 16-bit value to an I/O port. */
+#define VBVO_PORT_WRITE_U16(Port, Value) \
+ outw(Port, Value)
+/** Write a 32-bit value to an I/O port. */
+#define VBVO_PORT_WRITE_U32(Port, Value) \
+ outl(Port, Value)
+/** Read an 8-bit value from an I/O port. */
+#define VBVO_PORT_READ_U8(Port) \
+ inb(Port)
+/** Read a 16-bit value from an I/O port. */
+#define VBVO_PORT_READ_U16(Port) \
+ inw(Port)
+/** Read a 32-bit value from an I/O port. */
+#define VBVO_PORT_READ_U32(Port) \
+ inl(Port)
+
+/** @} */
+
+#endif /* !VBOX_INCLUDED_Graphics_VBoxVideoIPRT_h */