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interrupt.h

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/*!     \file include/arch/interrupt.h
 *      \brief Interrupt manager header.
 *      \author Andrea Righi <drizzt@inwind.it>
 *      \date Last update: 2003-11-05
 *      \note Copyright (&copy;) 2003 Andrea Righi
 */

#ifndef INTERRUPT_H
#define INTERRUPT_H

#include <const.h>

// --- IRQ ------------------------------------------------------------ //

//! Timer IRQ line.
#define TIMER_IRQ       0x00
//! Keyboard IRQ line.
#define KEYBOARD_IRQ    0x01
//! Serial COM1 IRQ line.
#define RS232_1_IRQ     0x04
//! Serial COM2 IRQ line.
#define RS232_2_IRQ     0x03
//! Floppy IRQ line.
#define FLOPPY_IRQ      0x06
// **************** Luca Giovacchini (Ide) ****************
//! IDE primary channel IRQ line.
#define IDEP_IRQ        0x0E
//! IDE secondary channel IRQ line.
#define IDES_IRQ        0x0F
// ********************************************************

// --- Reserved Interrupt --------------------------------------------- //

//! Minirighi interrupt (used for the system calls).
#define MINIRIGHI_INT   0x80
//! DOS interrupt (maybe will be used for DOS emulation...)
#define DOS_INT         0x20

// --- EFLAGS --------------------------------------------------------- //

//! Interrupt enable flag in EFLAGS register.
#define EFLAGS_IF       0x200

//! I/O privilege level 3 (minimum privilege).
//! Everyone can perform I/O operation.
#define EFLAGS_IOPL3    0x3000

//! I/O privilege level 2.
#define EFLAGS_IOPL2    0x2000

//! I/O privilege level 1.
#define EFLAGS_IOPL1    0x3000

//! I/O privilege level 0 (maximum privilege).
//! Only the kernel can perform I/O operation.
#define EFLAGS_IOPL0    0x0000

// --- PIC (Programmable Interrupt Controller) 8259 ------------------- //

//! PIC 8259 master.
#define PORT_8259_M     0x20
//! PIC 8259 slave.
#define PORT_8259_S     0xA0
//! PIC 8259 master (interrupt mask).
#define PORT_INT_MASK_M 0x21
//! PIC 8259 slave (interrupt mask).
#define PORT_INT_MASK_S 0xA1
//! PIC 8259 EOI (End Of Interrupt).
#define EOI             0x20

// --- IDT (Interrupt Descriptor Table) ------------------------------- //

//! Number of entries in the IDT.
#define IDT_DIM         256

//! IDT entry structure.
typedef struct idt_entry
{
        word offset0_15;
        word selector;
        byte paramcnt;
        byte attribs;
        word offset16_31;
} idt_entry_t;

//! IDT register structure.
typedef struct idt_reg
{
        word limit;
        byte base[sizeof(dword)];
} idt_reg_t;

//! Context after an interrupt.
typedef struct irq_context
{
        //! General purpose register.
        uint32_t        edi, esi, ebp, esp, ebx, edx, ecx, eax;
        //! Segment register.
        uint32_t        es, ds, fs, gs;
        //! The interrupt number.
        uint32_t        IRQ;
        //! Current instruction pointer (a.k.a. program counter).
        uint32_t        eip;
        //! Code segment register.
        uint32_t        cs;
        //! EFLAGS register.
        uint32_t        eflags;
} __attribute__ ((packed)) irq_context_t;

// --- Prototypes ----------------------------------------------------- //

/** \ingroup Kernel
 *  \defgroup KInterrupt Interrupt Manager
 *  The interrupt manager.
 *  @{
 */

void disable_IRQ(uint8_t IRQ);
void enable_IRQ(uint8_t IRQ);
void reprogram_PIC();
void install_IDT();
void install_irq_handler(uint8_t irq, void *handler);

/** @} */ // end of KInterrupt

#endif

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