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/*
* ISR Vectoring support for the Synova Mongoose-V.
*
* COPYRIGHT (c) 1989-2001.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <rtems.h>
#include <stdlib.h>
#include <libcpu/mongoose-v.h>
#define mips_get_cause( _cause ) \
do { \
asm volatile( "mfc0 %0, $13; nop" : "=r" (_cause) : ); \
} while (0)
#define CALL_ISR(_vector) \
do { \
if ( _ISR_Vector_table[_vector] ) \
(_ISR_Vector_table[_vector])(_vector); \
else \
mips_default_exception(_vector); \
} while (0)
#include <bspIo.h> /* for printk */
void mips_default_exception( int vector )
{
printk( "Unhandled exception %d\n", vector );
rtems_fatal_error_occurred(1);
}
void mips_vector_isr_handlers( void )
{
unsigned int sr;
unsigned int cause;
int bit;
unsigned int pf_icr;
mips_get_sr( sr );
mips_get_cause( cause );
cause &= (sr & SR_IMASK);
cause >>= CAUSE_IPSHIFT;
if ( cause & 0x04 ) /* IP[0] ==> INT0 == TIMER1 */
CALL_ISR( MONGOOSEV_IRQ_TIMER1 );
if ( cause & 0x08 ) /* IP[1] ==> INT1 == TIMER2*/
CALL_ISR( MONGOOSEV_IRQ_TIMER2 );
if ( cause & 0x10 ) /* IP[2] ==> INT2 */
CALL_ISR( MONGOOSEV_IRQ_INT2 );
if ( cause & 0x20 ) /* IP[3] ==> INT4 */
CALL_ISR( MONGOOSEV_IRQ_INT4 );
if ( cause & 0x40 ) { /* IP[4] ==> INT5 */
pf_icr =
MONGOOSEV_READ( MONGOOSEV_PERIPHERAL_FUNCTION_INTERRUPT_CAUSE_REGISTER );
/* XXX if !pf_icr */
for ( bit=0 ; bit <= 31 ; bit++, pf_icr >>= 1 ) {
if ( pf_icr & 1 )
CALL_ISR( MONGOOSEV_IRQ_PERIPHERAL_BASE + bit );
}
}
if ( cause & 0x02 ) /* SW[0] */
CALL_ISR( MONGOOSEV_IRQ_SOFTWARE_1 );
if ( cause & 0x01 ) /* IP[1] */
CALL_ISR( MONGOOSEV_IRQ_SOFTWARE_2 );
}
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