cos2000v2/lib/interrupts.c

/*******************************************************************************/
/* COS2000 - Compatible Operating System - LGPL v3 - Hordé Nicolas             */
/*                                                                             */
#include "interrupts.h"
#include "types.h"
#include "asm.h"
#include "memory.h"
#include "video.h"
#include "gdt.h"
#include "system.h"
#include "debug.h"
#include "process.h"
#include "handlers.h"

#define IDT_SIZE		256	/* nombre de descripteurs */

 /* registre idt */
static struct idtr idtreg;

/* table de IDT */
static idtdes idt[IDT_SIZE];

static u32 retry_address;

extern wrapper_exception0;
extern wrapper_exception1;
extern wrapper_exception2;
extern wrapper_exception3;
extern wrapper_exception4;
extern wrapper_exception5;
extern wrapper_exception6;
extern wrapper_exception7;
extern wrapper_exception8;
extern wrapper_exception9;
extern wrapper_exception10;
extern wrapper_exception11;
extern wrapper_exception12;
extern wrapper_exception13;
extern wrapper_exception14;
extern wrapper_exception15;
extern wrapper_exception16;
extern wrapper_exception17;
extern wrapper_exception18;
/******************************************************************************/
/* Initialise la reprise après erreur */

void initretry(u32 address)
{
	retry_address = address;
}

/******************************************************************************/
/* Récupère l'adresse de reprise après erreur */

u32 getinitretry(void)
{
	return retry_address;
}

/******************************************************************************/
/* Initialise le controleur d'interruption 8259A */

void initpic(void)
{
	/* MASTER */
	/* Initialisation de ICW1 */
	outb(PIC1_CMD, ICW1_INIT + ICW1_ICW4);
	nop();
	/* Initialisation de ICW2 - vecteur de depart = 32 */
	outb(PIC1_DATA, 0x20);
	nop();
	/* Initialisation de ICW3 */
	outb(PIC1_DATA, 0x04);
	nop();
	/* Initialisation de ICW4 */
	outb(PIC1_DATA, ICW4_8086);
	nop();
	/* masquage des interruptions */
	outb(PIC1_DATA, 0xFF);
	nop();
	/* SLAVE */
	/* Initialisation de ICW1 */
	outb(PIC2_CMD, ICW1_INIT + ICW1_ICW4);
	nop();
	/* Initialisation de ICW2 - vecteur de depart = 96 */
	outb(PIC2_DATA, 0x60);
	nop();
	/* Initialisation de ICW3 */
	outb(PIC2_DATA, 0x02);
	nop();
	/* Initialisation de ICW4 */
	outb(PIC2_DATA, ICW4_8086);
	nop();
	/* masquage des interruptions */
	outb(PIC2_DATA, 0xFF);
	nop();
	/* Demasquage des irqs sauf clavier
	   outb(PIC1_DATA,0xFD);
	   nop();
	 */
}

/******************************************************************************/
/* Active une IRQ */

void enableirq(u8 irq)
{
	u16     port;
	cli();
	port = (((irq & 0x08) << 4) + PIC1_DATA);
	outb(port, inb(port) & ~(1 << (irq & 7)));
	sti();
}

/******************************************************************************/
/* Désactive une IRQ */

void disableirq(u8 irq)
{
	u16     port;
	cli();
	port = (((irq & 0x08) << 4) + PIC1_DATA);
	outb(port, inb(port) | (1 << (irq & 7)));
	sti();
}

/******************************************************************************/

/* Créé un descripteur pour l'IDT */

void makeidtdes(u32 offset, u16 select, u16 type, idtdes * desc)
{
	desc->offset0_15 = (offset & 0xffff);
	desc->select = select;
	desc->type = type;
	desc->offset16_31 = (offset & 0xffff0000) >> 16;
	return;
}

/******************************************************************************/
/* Change une entrée dans l'IDT */

void setidt(u32 offset, u16 select, u16 type, u16 index)
{
	cli();
	idtdes *desc;
	desc = idtreg.base;
	desc[index].offset0_15 = (offset & 0xffff);
	desc[index].select = select;
	desc[index].type = type;
	desc[index].offset16_31 = (offset & 0xffff0000) >> 16;
	sti();
}

/******************************************************************************/
/* Met une entrée dans l'IDT */

void putidt(u32 offset, u16 select, u16 type, u16 index)
{
	idtdes  temp;
	makeidtdes(offset, select, type, &temp);
	idt[index] = temp;
}

/******************************************************************************/
/* Initialise une IDT */

void initidt(void)
{
	u16     i;
	putidt((u32) &wrapper_exception0, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 0);
	putidt((u32) &wrapper_exception1, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 1);
	putidt((u32) &wrapper_exception2, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 2);
	putidt((u32) &wrapper_exception3, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 3);
	putidt((u32) &wrapper_exception4, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 4);
	putidt((u32) &wrapper_exception5, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 5);
	putidt((u32) &wrapper_exception6, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 6);
	putidt((u32) &wrapper_exception7, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 7);
	putidt((u32) &wrapper_exception8, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 8);
	putidt((u32) &wrapper_exception9, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 9);
	putidt((u32) &wrapper_exception10, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 10);
	putidt((u32) &wrapper_exception11, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 11);
	putidt((u32) &wrapper_exception12, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 12);
	putidt((u32) &wrapper_exception13, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 13);
	putidt((u32) &wrapper_exception14, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 14);
	putidt((u32) &wrapper_exception15, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 15);
	putidt((u32) &wrapper_exception16, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 16);
	putidt((u32) &wrapper_exception17, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 17);
	putidt((u32) &wrapper_exception18, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 18);
	for (i = 19; i < 32; i++)
	{
		putidt((u32) interruption, SEL_KERNEL_CODE,
		       ENTRY_PRESENT | ENTRY_RING3 | TRAPGATE, i);
	}
	putidt((u32) irq0, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 32);
	putidt((u32) irq1, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 33);
	putidt((u32) irq2, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 34);
	putidt((u32) irq3, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 35);
	putidt((u32) irq4, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 36);
	putidt((u32) irq5, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 37);
	putidt((u32) irq6, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 38);
	putidt((u32) irq7, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 39);
	for (i = 40; i < 96; i++)
	{
		putidt((u32) interruption, SEL_KERNEL_CODE,
		       ENTRY_PRESENT | ENTRY_RING3 | TRAPGATE, i);
	}
	putidt((u32) irq8, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 96);
	putidt((u32) irq9, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 97);
	putidt((u32) irq10, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 98);
	putidt((u32) irq11, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 99);
	putidt((u32) irq12, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 100);
	putidt((u32) irq13, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 101);
	putidt((u32) irq14, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 102);
	putidt((u32) irq15, SEL_KERNEL_CODE,
	       ENTRY_PRESENT | ENTRY_RING0 | INTGATE, 103);
	for (i = 104; i < IDT_SIZE; i++)
	{
		putidt((u32) interruption, SEL_KERNEL_CODE,
		       ENTRY_PRESENT | ENTRY_RING0 | TRAPGATE, i);
	}
	/* initialise le registre idt */
	idtreg.limite = IDT_SIZE * sizeof(idtdes);
	idtreg.base = IDT_ADDR;
	/* recopie de la IDT a son adresse */
	memcpy(&idt, (u8 *) idtreg.base, idtreg.limite, 1);
	/* chargement du registre IDTR */
	lidt(&idtreg);
}

/******************************************************************************/
/* 8253/8254 PIT (Programmable Interval Timer) Timer ajustable */

void inittimer(void)
{
	u32     divisor = TIMER_FREQ / HZ;
	outb(TIMER_MODE, RATE_GENERATOR);
	outb(TIMER0, (u8) divisor);
	outb(TIMER0, (u8) (divisor >> 8));
}
/*******************************************************************************/