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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [i386/] [i386ex/] [startup/] [setvec.c] - Blame information for rev 173

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1 30 unneback
/*  set_vector
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 *
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 *  This routine installs an interrupt vector on the Force CPU-386.
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 *
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 *  INPUT:
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 *    handler - interrupt handler entry point
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 *    vector  - vector number
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 *    type    - 0 indicates raw hardware connect
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 *              1 indicates RTEMS interrupt connect
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 *
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 *  RETURNS:
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 *    address of previous interrupt handler
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 *
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 *  COPYRIGHT (c) 1989-1999.
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 *  On-Line Applications Research Corporation (OAR).
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 *
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 *  The license and distribution terms for this file may be
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 *  found in the file LICENSE in this distribution or at
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 *  http://www.OARcorp.com/rtems/license.html.
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 *
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 *  $Id: setvec.c,v 1.2 2001-09-27 11:59:47 chris Exp $
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 */
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#include <rtems.h>
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#include <bsp.h>
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i386_isr_entry set_vector(                      /* returns old vector */
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  rtems_isr_entry     handler,                  /* isr routine        */
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  rtems_vector_number vector,                   /* vector number      */
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  int                 type                      /* RTEMS or RAW intr  */
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)
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{
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  i386_isr_entry previous_isr;
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  interrupt_gate_descriptor  idt;
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  if ( type )
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    rtems_interrupt_catch( handler, vector, (rtems_isr_entry *) &previous_isr );
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  else {
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    /* get the address of the old handler */
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    idt = Interrupt_descriptor_table[ vector ];
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    previous_isr = (i386_isr_entry)
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                      ((idt.offset_16_31 << 16) | idt.offset_0_15);
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    /* build the IDT entry */
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    create_interrupt_gate_descriptor( &idt, handler );
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    /* install the IDT entry */
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    Interrupt_descriptor_table[ vector ] = idt;
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  }
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  return previous_isr;
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}
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