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/*  set_vector

 *

 *  This routine installs an interrupt vector on the Force CPU-386.

 *

 *  INPUT:

 *    handler - interrupt handler entry point

 *    vector  - vector number

 *    type    - 0 indicates raw hardware connect

 *              1 indicates RTEMS interrupt connect

 *

 *  RETURNS:

 *    address of previous interrupt handler

 *

 *  COPYRIGHT (c) 1989-1999.

 *  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: setvec.c,v 1.2 2001-09-27 11:59:50 chris Exp $

 */

#include <rtems.h>

#include <bsp.h>

i386_isr_entry set_vector(                      /* returns old vector */

  rtems_isr_entry     handler,                  /* isr routine        */

  rtems_vector_number vector,                   /* vector number      */

  int                 type                      /* RTEMS or RAW intr  */

)

{

  i386_isr_entry previous_isr;

  interrupt_gate_descriptor  idt;

  if ( type )

    rtems_interrupt_catch( handler, vector, (rtems_isr_entry *) &previous_isr );

  else {

    /* get the address of the old handler */

    idt = Interrupt_descriptor_table[ vector ];

    previous_isr = (i386_isr_entry)

                      ((idt.offset_16_31 << 16) | idt.offset_0_15);

    /* build the IDT entry */

    create_interrupt_gate_descriptor( &idt, handler );

    /* install the IDT entry */

    Interrupt_descriptor_table[ vector ] = idt;

  }

  return previous_isr;

}