idtr.h

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/* SPDX-License-Identifier: BSD-2-Clause */
 
/*
 * COPYRIGHT (C) 1998  Eric Valette (valette@crf.canon.fr)
 *                     Canon Centre Recherche France.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
 
#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