/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @brief Intel I386 Data Structures
*
* @addtogroup RTEMSScoreCPUi386
*
* 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.
*
* Applications must not include this file directly.
*/
/*
* 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