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/**
* @file rtems/score/idtr.h
*/
/*
* This file contains definitions for data structure related
* to Intel system programming. More information can be found
* on Intel site and more precisely in the following book :
*
* Pentium Processor familly
* Developper's Manual
*
* Volume 3 : Architecture and Programming Manual
*
* Formerly contained in and extracted from libcpu/i386/cpu.h.
*
* COPYRIGHT (C) 1998 Eric Valette (valette@crf.canon.fr)
* Canon Centre Recherche France.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*
* Applications must not include this file directly.
*/
#ifndef _RTEMS_SCORE_IDTR_H
#define _RTEMS_SCORE_IDTR_H
/*
* See page 14.9 Figure 14-2.
*
*/
typedef struct
{
unsigned int low_offsets_bits:16;
unsigned int segment_selector:16;
unsigned int fixed_value_bits:8;
unsigned int gate_type:5;
unsigned int privilege:2;
unsigned int present:1;
unsigned int high_offsets_bits:16;
} interrupt_gate_descriptor;
/*
* C callable function enabling to create a interrupt_gate_descriptor
*/
extern void create_interrupt_gate_descriptor (interrupt_gate_descriptor*, rtems_raw_irq_hdl);
/*
* C callable function enabling to get easily usable info from
* the actual value of IDT register.
*/
extern void i386_get_info_from_IDTR (interrupt_gate_descriptor** table,
unsigned* limit);
/*
* C callable function enabling to change the value of IDT register. Must be called
* with interrupts masked at processor level!!!.
*/
extern void i386_set_IDTR (interrupt_gate_descriptor* table,
unsigned limit);
#endif
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