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Diffstat (limited to 'c/src/exec/score/cpu/i386/rtems/score/idtr.h')
| -rw-r--r-- | c/src/exec/score/cpu/i386/rtems/score/idtr.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/c/src/exec/score/cpu/i386/rtems/score/idtr.h b/c/src/exec/score/cpu/i386/rtems/score/idtr.h new file mode 100644 index 0000000000..7c4f95214f --- /dev/null +++ b/c/src/exec/score/cpu/i386/rtems/score/idtr.h @@ -0,0 +1,62 @@ +/* + * 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 found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + * + * 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 |