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/**
* @file irq.c
*
* This file contains the implementation of the function described in irq.h.
*/
/*
* RTEMS GBA BSP
*
* Copyright (c) 2010 embedded brains GmbH.
*
* Copyright (c) 2002 by Jay Monkman <jtm@smoothsmoothie.com>
*
* Copyright (c) 2002 by Charlie Steader <charlies@poliac.com>
*
* Copyright (c) 2004 by Markku Puro <markku.puro@kopteri.net>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <bsp.h>
#include <bsp/irq.h>
#include <bsp/irq-generic.h>
#include <gba_registers.h>
void bsp_interrupt_dispatch(void)
{
unsigned reg_ie = GBA_REG_IE;
unsigned reg_if = GBA_REG_IF & reg_ie;
rtems_vector_number vector = 31 - __builtin_clz(reg_if);
bsp_interrupt_handler_dispatch(vector);
GBA_REG_IF = 1 << vector;
}
rtems_status_code bsp_interrupt_vector_enable(rtems_vector_number vector)
{
GBA_REG_IE |= 1 << vector;
return RTEMS_SUCCESSFUL;
}
rtems_status_code bsp_interrupt_vector_disable(rtems_vector_number vector)
{
GBA_REG_IE &= ~(1 << vector);
return RTEMS_SUCCESSFUL;
}
rtems_status_code bsp_interrupt_facility_initialize(void)
{
/* clear all interrupt status flags */
GBA_REG_IF = 0xffff;
/* disable all interrupts */
GBA_REG_IE = 0;
/* set master interrupt enable */
GBA_REG_IME = 1;
/* Exception handler is already present in the ROM BIOS */
return RTEMS_SUCCESSFUL;
}
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