xio_dcr.h

实用的程序代码

/* $Id: xio_dcr.h,v 1.7 2002/07/26 20:27:56 moleres Exp $ */
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/**
*
* @file xio_dcr.h
*
* The DCR I/O access functions.
*
* @note
*
* These access functions are specific to the PPC405 CPU. Changes might be
* necessary for other members of the IBM PPC Family.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who  Date     Changes
* ----- ---- -------- -----------------------------------------------
* 1.00a ecm  10/18/01 First release
* </pre>
*
* @internal
*
* The C functions which subsequently call into either the assembly code
* or into the provided table of functions are required since the registers
* assigned to the calling and return from functions are strictly defined
* in the ABI and that definition is used in the low-level functions
* directly. The use of macros is not recommended since the temporary
* registers in the ABI are defined but there is no way to force
* the compiler to use a specific register in a block of code.
*
******************************************************************************/

#ifndef XDCRIO_H /* prevent circular inclusions */
#define XDCRIO_H /* by using protection macros */

/***************************** Include Files *********************************/
#include "xbasic_types.h"

/************************** Constant Definitions *****************************/


#define MAX_DCR_REGISTERS           1024
#define MAX_DCR_REGISTER            MAX_DCR_REGISTERS - 1
#define MIN_DCR_REGISTER            0

/**************************** Type Definitions *******************************/


/***************** Macros (Inline Functions) Definitions *********************/


/************************** Function Prototypes ******************************/

/*
 * Access Functions
 */
void XIo_DcrOut(Xuint32 DcrRegister, Xuint32 Data);
Xuint32 XIo_DcrIn(Xuint32 DcrRegister);


#endif            /* end of protection macro */