text: /******************************************************************************
  *
  * Copyright (C) 2014 - 2015 Xilinx, 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, 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.
  *
  * Use of the Software is limited solely to applications:
  * (a) running on a Xilinx device, or
  * (b) that interact with a Xilinx device through a bus or interconnect.
  *
  * 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
  * XILINX  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.
  *
  * Except as contained in this notice, the name of the Xilinx shall not be used
  * in advertising or otherwise to promote the sale, use or other dealings in
  * this Software without prior written authorization from Xilinx.
  *
  ******************************************************************************/
  /*****************************************************************************/
  /**
  *
  * @file xil_io.c
  *
  * Contains I/O functions for memory-mapped or non-memory-mapped I/O
  * architectures.  These functions encapsulate Cortex A53 architecture-specific
  * I/O requirements.
  *
  * @note
  *
  * This file contains architecture-dependent code.
  *
  * <pre>
  * MODIFICATION HISTORY:
  *
  * Ver   Who      Date     Changes
  * ----- -------- -------- -----------------------------------------------
  * 5.00 	pkp  	 05/29/14 First release
  * </pre>
  ******************************************************************************/
  
  
  /***************************** Include Files *********************************/
  #include "xil_io.h"
  #include "xil_types.h"
  #include "xil_assert.h"
  #include "xpseudo_asm.h"
  #include "xreg_cortexa53.h"
  
  /************************** Constant Definitions *****************************/
  
  /**************************** Type Definitions *******************************/
  
  /***************** Macros (Inline Functions) Definitions *********************/
  
  /************************** Function Prototypes ******************************/
  
  /*****************************************************************************/
  /**
  *
  * Performs an input operation for an 8-bit memory location by reading from the
  * specified address and returning the Value read from that address.
  *
  * @param	Addr contains the address to perform the input operation
  *		at.
  *
  * @return	The Value read from the specified input address.
  *
  * @note		None.
  *
  ******************************************************************************/
  u8 Xil_In8(INTPTR Addr)
  {
  	return *(volatile u8 *) Addr;
  }
  
  /*****************************************************************************/
  /**
  *
  * Performs an input operation for a 16-bit memory location by reading from the
  * specified address and returning the Value read from that address.
  *
  * @param	Addr contains the address to perform the input operation
  *		at.
  *
  * @return	The Value read from the specified input address.
  *
  * @note		None.
  *
  ******************************************************************************/
  u16 Xil_In16(INTPTR Addr)
  {
  	return *(volatile u16 *) Addr;
  }
  
  /*****************************************************************************/
  /**
  *
  * Performs an input operation for a 32-bit memory location by reading from the
  * specified address and returning the Value read from that address.
  *
  * @param	Addr contains the address to perform the input operation
  *		at.
  *
  * @return	The Value read from the specified input address.
  *
  * @note		None.
  *
  ******************************************************************************/
  u32 Xil_In32(INTPTR Addr)
  {
  	return *(volatile u32 *) Addr;
  }
  
  /*****************************************************************************/
  /**
  *
  * Performs an output operation for an 8-bit memory location by writing the
  * specified Value to the the specified address.
  *
  * @param	Addr contains the address to perform the output operation
  *		at.
  * @param	Value contains the Value to be output at the specified address.
  *
  * @return	None.
  *
  * @note		None.
  *
  ******************************************************************************/
  void Xil_Out8(INTPTR Addr, u8 Value)
  {
  	volatile u8 *LocalAddr = (u8 *)Addr;
  	*LocalAddr = Value;
  }
  
  /*****************************************************************************/
  /**
  *
  * Performs an output operation for a 16-bit memory location by writing the
  * specified Value to the the specified address.
  *
  * @param	Addr contains the address to perform the output operation
  *		at.
  * @param	Value contains the Value to be output at the specified address.
  *
  * @return	None.
  *
  * @note		None.
  *
  ******************************************************************************/
  void Xil_Out16(INTPTR Addr, u16 Value)
  {
  	volatile u16 *LocalAddr = (u16 *)Addr;
  	*LocalAddr = Value;
  }
  
  /*****************************************************************************/
  /**
  *
  * Performs an output operation for a 32-bit memory location by writing the
  * specified Value to the the specified address.
  *
  * @param	Addr contains the address to perform the output operation
  *		at.
  * @param	Value contains the Value to be output at the specified address.
  *
  * @return	None.
  *
  * @note		None.
  *
  ******************************************************************************/
  void Xil_Out32(INTPTR Addr, u32 Value)
  {
  	volatile u32 *LocalAddr = (u32 *)Addr;
  	*LocalAddr = Value;
  }
  
  /*****************************************************************************/
  /**
  *
  * Performs an output operation for a 64-bit memory location by writing the
  * specified Value to the the specified address.
  *
  * @param	Addr contains the address to perform the output operation
  *		at.
  * @param	Value contains the Value to be output at the specified address.
  *
  * @return	None.
  *
  * @note		None.
  *
  ******************************************************************************/
  void Xil_Out64(INTPTR Addr, u64 Value)
  {
  	volatile u64 *LocalAddr = (u64 *)Addr;
  	*LocalAddr = Value;
  }
  
  /*****************************************************************************/
  /**
  *
  * Performs an input operation for a 64-bit memory location by reading the
  * specified Value to the the specified address.
  *
  * @param	OutAddress contains the address to perform the output operation
  *		at.
  * @param	Value contains the Value to be output at the specified address.
  *
  * @return	None.
  *
  * @note		None.
  *
  ******************************************************************************/
  u64 Xil_In64(INTPTR Addr)
  {
  	return *(volatile u64 *) Addr;
  }
  /*****************************************************************************/
  /**
  *
  * Performs an input operation for a 16-bit memory location by reading from the
  * specified address and returning the byte-swapped Value read from that
  * address.
  *
  * @param	Addr contains the address to perform the input operation
  *		at.
  *
  * @return	The byte-swapped Value read from the specified input address.
  *
  * @note		None.
  *
  ******************************************************************************/
  u16 Xil_In16BE(INTPTR Addr)
  {
  	u16 temp;
  	u16 result;
  
  	temp = Xil_In16(Addr);
  
  	result = Xil_EndianSwap16(temp);
  
  	return result;
  }
  
  /*****************************************************************************/
  /**
  *
  * Performs an input operation for a 32-bit memory location by reading from the
  * specified address and returning the byte-swapped Value read from that
  * address.
  *
  * @param	Addr contains the address to perform the input operation
  *		at.
  *
  * @return	The byte-swapped Value read from the specified input address.
  *
  * @note		None.
  *
  ******************************************************************************/
  u32 Xil_In32BE(INTPTR Addr)
  {
  	u32 temp;
  	u32 result;
  
  	temp = Xil_In32(Addr);
  
  	result = Xil_EndianSwap32(temp);
  
  	return result;
  }
  
  /*****************************************************************************/
  /**
  *
  * Performs an output operation for a 16-bit memory location by writing the
  * specified Value to the the specified address. The Value is byte-swapped
  * before being written.
  *
  * @param	Addr contains the address to perform the output operation
  *		at.
  * @param	Value contains the Value to be output at the specified address.
  *
  * @return	None.
  *
  * @note		None.
  *
  ******************************************************************************/
  void Xil_Out16BE(INTPTR Addr, u16 Value)
  {
  	u16 temp;
  
  	temp = Xil_EndianSwap16(Value);
  
      Xil_Out16(Addr, temp);
  }
  
  /*****************************************************************************/
  /**
  *
  * Performs an output operation for a 32-bit memory location by writing the
  * specified Value to the the specified address. The Value is byte-swapped
  * before being written.
  *
  * @param	Addr contains the address to perform the output operation
  *		at.
  * @param	Value contains the Value to be output at the specified address.
  *
  * @return	None.
  *
  * @note		None.
  *
  ******************************************************************************/
  void Xil_Out32BE(INTPTR Addr, u32 Value)
  {
  	u32 temp;
  
  	temp = Xil_EndianSwap32(Value);
  
      Xil_Out32(Addr, temp);
  }
  
  /*****************************************************************************/
  /**
  *
  * Perform a 16-bit endian converion.
  *
  * @param	Data contains the value to be converted.
  *
  * @return	converted value.
  *
  * @note		None.
  *
  ******************************************************************************/
  u16 Xil_EndianSwap16(u16 Data)
  {
  	return (u16) (((Data & 0xFF00U) >> 8U) | ((Data & 0x00FFU) << 8U));
  }
  
  /*****************************************************************************/
  /**
  *
  * Perform a 32-bit endian converion.
  *
  * @param	Data contains the value to be converted.
  *
  * @return	converted value.
  *
  * @note		None.
  *
  ******************************************************************************/
  u32 Xil_EndianSwap32(u32 Data)
  {
  	u16 LoWord;
  	u16 HiWord;
  
  	/* get each of the half words from the 32 bit word */
  
  	LoWord = (u16) (Data & 0x0000FFFFU);
  	HiWord = (u16) ((Data & 0xFFFF0000U) >> 16U);
  
  	/* byte swap each of the 16 bit half words */
  
  	LoWord = (((LoWord & 0xFF00U) >> 8U) | ((LoWord & 0x00FFU) << 8U));
  	HiWord = (((HiWord & 0xFF00U) >> 8U) | ((HiWord & 0x00FFU) << 8U));
  
  	/* swap the half words before returning the value */
  
  	return ((((u32)LoWord) << (u32)16U) | (u32)HiWord);
  }
  