+// SPDX-License-Identifier: GPL-2.0
/*
* Serial driver for the amiga builtin port.
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* TTY over Blackfin JTAG Communication
*
+// SPDX-License-Identifier: GPL-2.0
#undef BLOCKMOVE
#define Z_WAKE
#undef Z_EXT_CHARS_IN_BUFFER
+// SPDX-License-Identifier: GPL-2.0
/* ePAPR hypervisor byte channel device driver
*
* Copyright 2009-2011 Freescale Semiconductor, Inc.
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2007 Google, Inc.
* Copyright (C) 2012 Intel, Inc.
+// SPDX-License-Identifier: GPL-2.0+
/*
* Console via Blackfin JTAG Communication
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
* Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
+// SPDX-License-Identifier: GPL-2.0+
/*
* hvc_console.h
* Copyright (C) 2005 IBM Corporation
+// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
+// SPDX-License-Identifier: GPL-2.0+
/*
* opal driver interface to hvc_console.c
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* IBM RTAS driver interface to hvc_console.c
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* udbg interface to hvc_console.c
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* vio driver interface to hvc_console.c
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* xen console driver interface to hvc_console.c
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* IBM eServer Hypervisor Virtual Console Server Device Driver
* Copyright (C) 2003, 2004 IBM Corp.
+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2004 Hollis Blanchard <hollisb@us.ibm.com>, IBM
*
+// SPDX-License-Identifier: GPL-2.0
/*
* IPWireless 3G PCMCIA Network Driver
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
+// SPDX-License-Identifier: GPL-2.0
/*
* dashtty.c - tty driver for Dash channels interface.
*
+// SPDX-License-Identifier: GPL-2.0
/*
* TTY driver for MIPS EJTAG Fast Debug Channels.
*
+// SPDX-License-Identifier: GPL-2.0+
/*****************************************************************************/
/*
* moxa.c -- MOXA Intellio family multiport serial driver.
+// SPDX-License-Identifier: GPL-2.0+
/*
* mxser.c -- MOXA Smartio/Industio family multiport serial driver.
*
+// SPDX-License-Identifier: GPL-2.0
/*
* n_gsm.c GSM 0710 tty multiplexor
* Copyright (c) 2009/10 Intel Corporation
+// SPDX-License-Identifier: GPL-1.0+
/* generic HDLC line discipline for Linux
*
* Written by Paul Fulghum paulkf@microgate.com
+// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/tty.h>
+// SPDX-License-Identifier: GPL-1.0+
/* r3964 linediscipline for linux
*
* -----------------------------------------------------------
+// SPDX-License-Identifier: GPL-2.0
/*
* n_tracerouter.c - Trace data router through tty space
*
+// SPDX-License-Identifier: GPL-2.0
/*
* n_tracesink.c - Trace data router and sink path through tty space.
*
+// SPDX-License-Identifier: GPL-2.0
/*
* n_tracesink.h - Kernel driver API to route trace data in kernel space.
*
+// SPDX-License-Identifier: GPL-1.0+
/*
* n_tty.c --- implements the N_TTY line discipline.
*
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/*
* nozomi.c -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
*
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/*
* RocketPort device driver for Linux
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org>
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org>
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Driver for the serial port on the 21285 StrongArm-110 core logic chip.
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for 8250/16550-type serial ports
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2005 Russell King.
* Data taken from include/asm-i386/serial.h
+// SPDX-License-Identifier: GPL-2.0
/*
* linux/drivers/serial/acorn.c
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Serial Port driver for Aspeed VUART device
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Serial port driver for BCM2835AUX UART
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2005 Russell King.
* Data taken from include/asm-i386/serial.h
+// SPDX-License-Identifier: GPL-2.0+
/*
* Universal/legacy driver for 8250/16550-type serial ports
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* 8250_dma.c - DMA Engine API support for 8250.c
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Synopsys DesignWare 8250 driver.
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Early serial console for 8250/16550 devices
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Renesas Emma Mobile 8250 driver
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Probe module for 8250/16550-type Exar chips PCI serial ports.
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Written by Paul B Schroeder < pschroeder "at" uplogix "dot" com >
* Based on 8250_boca.
+// SPDX-License-Identifier: GPL-2.0
/*
* Probe for F81216A LPC to 4 UART
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2005 Russell King.
* Data taken from include/asm-i386/serial.h
+// SPDX-License-Identifier: GPL-2.0
#include <linux/serial_reg.h>
#include <linux/serial_8250.h>
+// SPDX-License-Identifier: GPL-2.0+
/*
* Serial Device Initialisation for Lasi/Asp/Wax/Dino
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Driver for the 98626/98644/internal serial interface on hp300/hp400
* (based on the National Semiconductor INS8250/NS16550AF/WD16C552 UARTs)
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2005 Russell King.
* Data taken from include/asm-i386/serial.h
+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2010 Lars-Peter Clausen <lars@metafoo.de>
* Copyright (C) 2015 Imagination Technologies
+// SPDX-License-Identifier: GPL-2.0
/*
* Serial port driver for NXP LPC18xx/43xx UART
*
+// SPDX-License-Identifier: GPL-2.0
/*
* 8250_lpss.c - Driver for UART on Intel Braswell and various other Intel SoCs
*
+// SPDX-License-Identifier: GPL-2.0
/*
* 8250_mid.c - Driver for UART on Intel Penwell and various other Intel SOCs
*
+// SPDX-License-Identifier: GPL-2.0
/*
* 8250_moxa.c - MOXA Smartio/Industio MUE multiport serial driver.
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Mediatek 8250 driver.
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Serial Port driver for Open Firmware platform devices
*
+// SPDX-License-Identifier: GPL-2.0
/*
* 8250-core based driver for the OMAP internal UART
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Probe module for 8250/16550-type PCI serial ports.
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Probe for 8250/16550-type ISAPNP serial ports.
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Base port operations for 8250/16550-type serial ports
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* drivers/tty/serial/8250/8250_pxa.c -- driver for PXA on-board UARTS
* Copyright: (C) 2013 Sergei Ianovich <ynvich@gmail.com>
+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
*
+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
/*======================================================================
A driver for PCMCIA serial devices
+// SPDX-License-Identifier: GPL-2.0+
/*
* altera_jtaguart.c -- Altera JTAG UART driver
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* altera_uart.c -- Altera UART driver
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for AMBA serial ports
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for AMBA serial ports
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Driver for GRLIB serial ports (APBUART)
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Atheros AR933X SoC built-in UART driver
*
+// SPDX-License-Identifier: GPL-2.0
/*
* ARC On-Chip(fpga) UART Driver
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for Atmel AT91 Serial ports
* Copyright (C) 2003 Rick Bronson
+// SPDX-License-Identifier: GPL-2.0+
/*
* include/linux/atmel_serial.h
*
+// SPDX-License-Identifier: GPL-2.0
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
+// SPDX-License-Identifier: GPL-2.0+
/*
* Blackfin On-Chip Sport Emulated UART Driver
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Blackfin On-Chip Sport Emulated UART Driver
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Blackfin On-Chip Serial Driver
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for CLPS711x serial ports
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Driver for CPM (SCC/SMC) serial ports
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for CPM (SCC/SMC) serial ports; core driver
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for CPM (SCC/SMC) serial ports; CPM1 definitions
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for CPM (SCC/SMC) serial ports; CPM2 definitions
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for Conexant Digicolor serial ports (USART)
*
+// SPDX-License-Identifier: GPL-2.0
/*
* dz.c: Serial port driver for DECstations equipped
* with the DZ chipset.
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2012 ARM Ltd.
* Author: Marc Zyngier <marc.zyngier@arm.com>
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2014 Linaro Ltd.
* Author: Rob Herring <robh@kernel.org>
+// SPDX-License-Identifier: GPL-2.0
#if defined(CONFIG_SERIAL_EFM32_UART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
+// SPDX-License-Identifier: GPL-2.0+
/*
* Freescale lpuart serial port driver
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* icom.c
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* icom.h
*
+// SPDX-License-Identifier: GPL-2.0
/****************************************************************************
*
* Driver for the IFX 6x60 spi modem.
+// SPDX-License-Identifier: GPL-2.0
/****************************************************************************
*
* Driver for the IFX spi modem.
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for Motorola/Freescale IMX serial ports
*
+// SPDX-License-Identifier: GPL-2.0
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
+// SPDX-License-Identifier: GPL-2.0
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
+// SPDX-License-Identifier: GPL-2.0
/*
* Driver for Zilog serial chips found on SGI workstations and
* servers. This driver could actually be made more generic.
+// SPDX-License-Identifier: GPL-2.0+
/************************************************************************
* Copyright 2003 Digi International (www.digi.com)
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2003 Digi International (www.digi.com)
* Scott H Kilau <Scott_Kilau at digi dot com>
+// SPDX-License-Identifier: GPL-2.0+
/************************************************************************
* Copyright 2003 Digi International (www.digi.com)
*
+// SPDX-License-Identifier: GPL-2.0+
/************************************************************************
* Copyright 2003 Digi International (www.digi.com)
*
+// SPDX-License-Identifier: GPL-2.0+
/************************************************************************
* Copyright 2003 Digi International (www.digi.com)
*
+// SPDX-License-Identifier: GPL-2.0
/*
* KGDB NMI serial console
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Based on the same principle as kgdboe using the NETPOLL api, this
* driver uses a console polling api to implement a gdb serial inteface
+// SPDX-License-Identifier: GPL-2.0
/*
* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* High Speed Serial Ports on NXP LPC32xx SoC
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* m32r_sio.c
*
+// SPDX-License-Identifier: GPL-1.0+
/*
* m32r_sio_reg.h
*
+// SPDX-License-Identifier: GPL-2.0+
/*
*
* Copyright (C) 2008 Christian Pellegrin <chripell@evolware.org>
+// SPDX-License-Identifier: GPL-2.0+
/*
* Maxim (Dallas) MAX3107/8/9, MAX14830 serial driver
*
+// SPDX-License-Identifier: GPL-2.0+
/****************************************************************************/
/*
+// SPDX-License-Identifier: GPL-2.0
/*
* MEN 16z135 High Speed UART
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Based on meson_uart.c, by AMLOGIC, INC.
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs.
*
+// SPDX-License-Identifier: GPL-2.0
/*
* MPS2 UART driver
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Generic driver for the MPSC (UART mode) on Marvell parts (e.g., GT64240,
* GT64260, MV64340, MV64360, GT96100, ... ).
+// SPDX-License-Identifier: GPL-2.0
/*
* Driver for msm7k serial device and console
*
+// SPDX-License-Identifier: GPL-2.0+
/*
** mux.c:
** serial driver for the Mux console found in some PA-RISC servers.
+// SPDX-License-Identifier: GPL-2.0+
/*
* ***************************************************************************
* Marvell Armada-3700 Serial Driver
+// SPDX-License-Identifier: GPL-2.0+
/*
* Application UART driver for:
* Freescale STMP37XX/STMP378X
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for OMAP-UART controller.
* Based on drivers/serial/8250.c
+// SPDX-License-Identifier: GPL-2.0+
/*
* Actions Semi Owl family serial console
*
+// SPDX-License-Identifier: GPL-2.0
/*
*Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* PIC32 Integrated Serial Driver.
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* PIC32 Integrated Serial Driver.
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for PowerMac Z85c30 based ESCC cell found in the
* "macio" ASICs of various PowerMac models
+// SPDX-License-Identifier: GPL-2.0
/*
* UART driver for PNX8XXX SoCs
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Based on drivers/serial/8250.c by Russell King.
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Driver for Comtrol RocketPort EXPRESS/INFINITY cards
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for SA11x0 serial ports
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Driver core for Samsung SoC onboard UARTs.
*
+// SPDX-License-Identifier: GPL-2.0
#ifndef __SAMSUNG_H
#define __SAMSUNG_H
+// SPDX-License-Identifier: GPL-2.0+
/*
* Support for the asynchronous serial interface (DUART) included
* in the BCM1250 and derived System-On-a-Chip (SOC) devices.
+// SPDX-License-Identifier: GPL-2.0+
/*
* SC16IS7xx tty serial driver - Copyright (C) 2014 GridPoint
* Author: Jon Ringle <jringle@gridpoint.com>
+// SPDX-License-Identifier: GPL-2.0+
/*
* NXP (Philips) SCC+++(SCN+++) serial driver
*
+// SPDX-License-Identifier: GPL-2.0
/*
* serial_tegra.c
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver core for serial ports
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for KS8695 serial ports
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Helpers for controlling modem lines via GPIO
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Helpers for controlling modem lines via GPIO
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Derived from many drivers using generic_serial interface,
* especially serial_tx3912.c by Steven J. Hill and r39xx_serial.c
+// SPDX-License-Identifier: GPL-2.0
/*
* SuperH on-chip serial module support. (SCI with no FIFO / with FIFO)
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for CSR SiRFprimaII onboard UARTs.
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Drivers for CSR SiRFprimaII onboard UARTs.
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2012-2015 Spreadtrum Communications Inc.
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* st-asc.c: ST Asynchronous serial controller (ASC) driver
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) Maxime Coquelin 2015
* Copyright (C) STMicroelectronics SA 2017
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) Maxime Coquelin 2015
* Copyright (C) STMicroelectronics SA 2017
+// SPDX-License-Identifier: GPL-2.0
/* suncore.c
*
* Common SUN serial routines. Based entirely
+// SPDX-License-Identifier: GPL-2.0
/* sunhv.c: Serial driver for SUN4V hypervisor console.
*
* Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
+// SPDX-License-Identifier: GPL-2.0
/* sunsab.c: ASYNC Driver for the SIEMENS SAB82532 DUSCC.
*
* Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
+// SPDX-License-Identifier: GPL-2.0
/*
* su.c: Small serial driver for keyboard/mouse interface on sparc32/PCI
*
+// SPDX-License-Identifier: GPL-2.0
/* sunzilog.c: Zilog serial driver for Sparc systems.
*
* Driver for Zilog serial chips found on Sun workstations and
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2013 Tilera Corporation. All Rights Reserved.
*
+// SPDX-License-Identifier: GPL-2.0
/*
* timbuart.c timberdale FPGA UART driver
* Copyright (c) 2009 Intel Corporation
+// SPDX-License-Identifier: GPL-2.0
/*
* timbuart.c timberdale FPGA GPIO driver
* Copyright (c) 2009 Intel Corporation
+// SPDX-License-Identifier: GPL-2.0
/*
* uartlite.c: Serial driver for Xilinx uartlite serial controller
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Freescale QUICC Engine UART device driver
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for NEC VR4100 series Serial Interface Unit.
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
*
+// SPDX-License-Identifier: GPL-2.0+
/*
* Cadence UART driver (found in Xilinx Zynq)
*
+// SPDX-License-Identifier: GPL-2.0
/*
* zs.c: Serial port driver for IOASIC DECstations.
*
+// SPDX-License-Identifier: GPL-1.0+
/*
* $Id: synclink.c,v 4.38 2005/11/07 16:30:34 paulkf Exp $
*
+// SPDX-License-Identifier: GPL-1.0+
/*
* Device driver for Microgate SyncLink GT serial adapters.
*
+// SPDX-License-Identifier: GPL-1.0+
/*
* $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Creating audit events from TTY input.
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
*/
+// SPDX-License-Identifier: GPL-2.0
/*
* Tty buffer allocation management
*/
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
+// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kmod.h>
+// SPDX-License-Identifier: GPL-2.0
/*
* Ldisc rw semaphore
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Tty port functions
*/
+// SPDX-License-Identifier: GPL-2.0
/*
* consolemap.c
*
+// SPDX-License-Identifier: GPL-2.0
/*
* Written for linux by Johan Myreen as a translation from
* the assembly version by Linus (with diacriticals added)
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
projects / linux-2.6-microblaze.git / commitdiff