58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
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/*
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File: idt.H
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Author: R. Bettati
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Department of Computer Science
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Texas A&M University
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Date : 09/03/02
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Description: the Interrupt Description Table (IDT)
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The IDT contains pointer to low-level exception and interrupt handlers.
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The way the exception handling is set up, all low-level handlers route
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the exception to a single exception dispatcher, which in turn
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calls a high-level exception dispatcher (see file 'exceptions.H').
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For details see Section 6 of Brandon Friesen's Tutorial
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on OS Kernel Development.
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URL: http://www.osdever.net/bkerndev/Docs/title.htm
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*/
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#ifndef _IDT_H_ // include file only once
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#define _IDT_H_
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/*--------------------------------------------------------------------------*/
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/* DEFINES */
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/*--------------------------------------------------------------------------*/
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//#define IDT_SIZE 256
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/*--------------------------------------------------------------------------*/
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/* Class IDT */
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/*--------------------------------------------------------------------------*/
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class IDT {
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public:
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static const int SIZE = 256;
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static void init();
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/* Initialize the IDT, and fill the 32 first entries with pointers to handle
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the 32 Intel-defined exceptions. After initializing the IDT, these exceptions
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are routed to the exception dispatcher (see 'exceptions.H'). At this point,
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no exception handlers are installed yet.
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*/
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static void set_gate(unsigned char num, unsigned long base,
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unsigned short sel, unsigned char flags);
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/* Used to install a low-level exception handler in the IDT. For high-level
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exception handlers, use the exception management framework defined in
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file 'exceptions.H'.
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*/
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};
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#endif
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