int.c

日本著名的的嵌入式实时操作系统T-Kernel的源码及用户手册。

/*
 *----------------------------------------------------------------------
 *    T-Kernel
 *
 *    Copyright (C) 2004 by Ken Sakamura. All rights reserved.
 *    T-Kernel is distributed under the T-License.
 *----------------------------------------------------------------------
 *
 *    Version:   1.01.00
 *    Released by T-Engine Forum(http://www.t-engine.org) at 2004/6/28.
 *
 *----------------------------------------------------------------------
 */

/*
 *	@(#)int.c (libtk/VR4131)
 *
 *	Interrupt controller 
 */

#include <basic.h>
#include <tk/syslib.h>
#include <tk/sysdef.h>

/*
 * Disable/enable interrupt
 */
IMPORT UINT _disint( void );
IMPORT void _enaint( UINT imask );
#define	_DI(imask)	( imask = _disint() )
#define	_EI(imask)	( _enaint(imask) )

/*
 * Set interrupt mode 
 *	Sets the interrupt specified in intvec to the mode
 *	specified in mode.
 *
 *	mode := (IM_LEVEL || IM_EDGE) | (IM_HI || IM_LOW)
 *
 *	The only intvec which can be set is GPIO interrupt.
 *
 *	The hold/through select register is set as follows.
 *	For edge trigger:	hold 
 *	For level trigger	through
 */
EXPORT void SetIntMode( INTVEC intvec, UINT mode )
{
	_UH	*typ, *hts, *als;
	UW	imask, bit;
	W	i;

	if ( (i = intvec - IV_GPIO(15)) >= 0 ) {
		typ = (_UH*)GIUINTTYPL;
		hts = (_UH*)GIUINTHTSELL;
		als = (_UH*)GIUINTALSELL;

	} else if ( (i = intvec - IV_GPIO(31)) >= 0 ) {
		typ = (_UH*)GIUINTTYPH;
		hts = (_UH*)GIUINTHTSELH;
		als = (_UH*)GIUINTALSELH;

	} else return;

	bit = 0x8000 >> i;

	_DI(imask);
	if ( (mode & IM_EDGE) != 0 ) {
		*typ |= bit;
		*hts |= bit;
	} else {
		*typ &= ~bit;
		*hts &= ~bit;
	}
	if ( (mode & IM_HI) != 0 ) {
		*als |= bit;
	} else {
		*als &= ~bit;
	}
	_EI(imask);
}

/*
 * Interrupt enabled 
 *	Enables the interrupt specified in intvec.
 *
 *	IRQ and GPIO interrupt can be specified in intvec.
 *	FPGA interrupt cannot be specified; a direct FPGA register
 *	operation is required. 
 */
EXPORT void EnableInt( INTVEC intvec )
{
	_UH	*msk;
	UW	imask;
	W	i;

	if ( (i = intvec - IV_GPIO(15)) >= 0 ) {
		msk = (_UH*)GIUINTENL;

	} else if ( (i = intvec - IV_GPIO(31)) >= 0 ) {
		msk = (_UH*)GIUINTENH;

	} else if ( (i = intvec - IV_IRQ(15)) >= 0 ) {
		msk = (_UH*)MSYSINT1REG;

	} else if ( (i = intvec - IV_IRQ(31)) >= 0 ) {
		msk = (_UH*)MSYSINT2REG;

	} else return;

	_DI(imask);
	*msk |= 0x8000 >> i;
	_EI(imask);
}

/*
 * Interrupt disabled 
 *	Disables the interrupt specified in intvec.
 *
 *	IRQ and GPIO can be specified in intvec.
 *	FPGA interrupt cannot be specified; a direct FPGA register
 *	operation is required.
 */
EXPORT void DisableInt( INTVEC intvec )
{
	_UH	*msk;
	UW	imask;
	W	i;

	if ( (i = intvec - IV_GPIO(15)) >= 0 ) {
		msk = (_UH*)GIUINTENL;

	} else if ( (i = intvec - IV_GPIO(31)) >= 0 ) {
		msk = (_UH*)GIUINTENH;

	} else if ( (i = intvec - IV_IRQ(15)) >= 0 ) {
		msk = (_UH*)MSYSINT1REG;

	} else if ( (i = intvec - IV_IRQ(31)) >= 0 ) {
		msk = (_UH*)MSYSINT2REG;

	} else return;

	_DI(imask);
	*msk &= ~(0x8000 >> i);
	_EI(imask);
}

/*
 * Clear interrupt request 
 *	Clears the intvec interrupt request. 
 *	Only GPIO can be specified as intvec.
 *
 *	Valid only for edge trigger.
 *	For edge trigger, the interrupt must be cleared with an
 *	interrupt handler.
 */
EXPORT void ClearInt( INTVEC intvec )
{
	_UH	*stat;
	W	i;

	if ( (i = intvec - IV_GPIO(15)) >= 0 ) {
		stat = (_UH*)GIUINTSTATL;

	} else if ( (i = intvec - IV_GPIO(31)) >= 0 ) {
		stat = (_UH*)GIUINTSTATH;

	} else return;

	*stat = 0x8000 >> i;
}

/*
 * Check for interrupt requests
 *	Checks for intvec interrupt  requests.
 *	If an interrupt request is found, returns TRUE (other than 0).
 */
EXPORT BOOL CheckInt( INTVEC intvec )
{
	_UH	*stat;
	W	i;

	if ( (i = intvec - IV_FPGA(31)) >= 0 ) {
		return *(_UW*)INT_PEND & (0x80000000 >> i);

	} else if ( (i = intvec - IV_GPIO(15)) >= 0 ) {
		stat = (_UH*)GIUINTSTATL;

	} else if ( (i = intvec - IV_GPIO(31)) >= 0 ) {
		stat = (_UH*)GIUINTSTATH;

	} else if ( (i = intvec - IV_IRQ(15)) >= 0 ) {
		stat = (_UH*)SYSINT1REG;

	} else if ( (i = intvec - IV_IRQ(31)) >= 0 ) {
		stat = (_UH*)SYSINT2REG;

	} else return FALSE;

	return *stat & (0x8000 >> i);
}