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#ifndef CYGONCE_HAL_HAL_ARBITER_H

#define CYGONCE_HAL_HAL_ARBITER_H

//=============================================================================

//

//      hal_arbiter.h

//

//      Functionality used by ISR arbiters

//

//=============================================================================

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//=============================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):   jskov

// Contributors:jskov

// Date:        2001-06-29

// Purpose:     Functionality used by ISR arbiters

// Usage:       #include <cyg/hal/hal_arbiter.h>

//                           

//####DESCRIPTIONEND####

//

//=============================================================================

#include <cyg/hal/hal_intr.h>           // hal_interrupt_x tables

#include <cyg/hal/drv_api.h>            // CYG_ISR_HANDLED

//=============================================================================

// Function used to call ISRs from ISR arbiters

// An arbiter is hooked on the shared interrupt vector and looks like this:

//

//  cyg_uint32 _arbitration_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)

//  {

//     cyg_uint32 isr_ret;

//     // decode interrupt source and for each active source call the ISR

//     if (source_A_active) {

//         isr_ret = hal_call_isr (CYGNUM_HAL_INTERRUPT_SOURCE_A);

//  #ifdef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN

//         if (isr_ret & CYG_ISR_HANDLED)

//  #endif

//             return isr_ret;

//     }

//     if (source_B_active) {

//         isr_ret = hal_call_isr (CYGNUM_HAL_INTERRUPT_SOURCE_B);

//  #ifdef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN

//         if (isr_ret & CYG_ISR_HANDLED)

//  #endif

//             return isr_ret;

//     }

//  ...

//     return 0;

//  }

//

// Remember to attach and enable the arbiter source:

//    HAL_INTERRUPT_ATTACH(CYGNUM_HAL_INTERRUPT_ARBITER, &_arbitration_isr, 0, 0);

//    HAL_INTERRUPT_SET_LEVEL(CYGNUM_HAL_INTERRUPT_ARBITER, 1);

//    HAL_INTERRUPT_UNMASK(CYGNUM_HAL_INTERRUPT_ARBITER);

//

typedef cyg_uint32 cyg_ISR(cyg_uint32 vector, CYG_ADDRWORD data);

extern void cyg_interrupt_post_dsr( CYG_ADDRWORD intr_obj );

#ifndef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN

static inline cyg_uint32

hal_call_isr (cyg_uint32 vector)

{

    cyg_ISR *isr;

    CYG_ADDRWORD data;

    cyg_uint32 isr_ret;

    isr = (cyg_ISR*) hal_interrupt_handlers[vector];

    data = hal_interrupt_data[vector];

    isr_ret = (*isr) (vector, data);

    if (isr_ret & CYG_ISR_CALL_DSR) {

        cyg_interrupt_post_dsr (hal_interrupt_objects[vector]);

    }

    return isr_ret & ~CYG_ISR_CALL_DSR;

}

#else

// In chained mode, assume vector 0 points to the chain

// handler. Simply call it with the vector number and let it find the

// ISR to call - it will also post DSRs as required.

static inline cyg_uint32

hal_call_isr (cyg_uint32 vector)

{

    cyg_ISR *isr;

    CYG_ADDRWORD data;

    cyg_uint32 isr_ret;

    isr = (cyg_ISR*) hal_interrupt_handlers[0];

    data = hal_interrupt_data[0];

    isr_ret = (*isr) (vector, data);

    return isr_ret;

}

#endif

//-----------------------------------------------------------------------------

#endif // CYGONCE_HAL_HAL_ARBITER_H

// End of hal_arbiter.h