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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