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interrupt.c
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interrupt.c
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/*
* interrupt.c -
*/
#include <types.h>
#include <interrupt.h>
#include <segment.h>
#include <hardware.h>
#include <io.h>#include <entry.h>#include <zeos_interrupt.h>
extern struct task_struct *idle_task;
extern struct task_struct *init_task;
Gate idt[IDT_ENTRIES];
Register idtR;
int zeos_ticks = 0;
char char_map[] =
{
'\0','\0','1','2','3','4','5','6',
'7','8','9','0','\'','¡','\0','\0',
'q','w','e','r','t','y','u','i',
'o','p','`','+','\0','\0','a','s',
'd','f','g','h','j','k','l','ñ',
'\0','º','\0','ç','z','x','c','v',
'b','n','m',',','.','-','\0','*',
'\0','\0','\0','\0','\0','\0','\0','\0',
'\0','\0','\0','\0','\0','\0','\0','7',
'8','9','-','4','5','6','+','1',
'2','3','0','\0','\0','\0','<','\0',
'\0','\0','\0','\0','\0','\0','\0','\0',
'\0','\0'
};
void setInterruptHandler(int vector, void (*handler)(), int maxAccessibleFromPL)
{
/***********************************************************************/
/* THE INTERRUPTION GATE FLAGS: R1: pg. 5-11 */
/* *************************** */
/* flags = x xx 0x110 000 ????? */
/* | | | */
/* | | \ D = Size of gate: 1 = 32 bits; 0 = 16 bits */
/* | \ DPL = Num. higher PL from which it is accessible */
/* \ P = Segment Present bit */
/***********************************************************************/
Word flags = (Word)(maxAccessibleFromPL << 13);
flags |= 0x8E00; /* P = 1, D = 1, Type = 1110 (Interrupt Gate) */
idt[vector].lowOffset = lowWord((DWord)handler);
idt[vector].segmentSelector = __KERNEL_CS;
idt[vector].flags = flags;
idt[vector].highOffset = highWord((DWord)handler);
}
void setTrapHandler(int vector, void (*handler)(), int maxAccessibleFromPL)
{
/***********************************************************************/
/* THE TRAP GATE FLAGS: R1: pg. 5-11 */
/* ******************** */
/* flags = x xx 0x111 000 ????? */
/* | | | */
/* | | \ D = Size of gate: 1 = 32 bits; 0 = 16 bits */
/* | \ DPL = Num. higher PL from which it is accessible */
/* \ P = Segment Present bit */
/***********************************************************************/
Word flags = (Word)(maxAccessibleFromPL << 13);
//flags |= 0x8F00; /* P = 1, D = 1, Type = 1111 (Trap Gate) */
/* Changed to 0x8e00 to convert it to an 'interrupt gate' and so
the system calls will be thread-safe. */
flags |= 0x8E00; /* P = 1, D = 1, Type = 1110 (Interrupt Gate) */
idt[vector].lowOffset = lowWord((DWord)handler);
idt[vector].segmentSelector = __KERNEL_CS;
idt[vector].flags = flags;
idt[vector].highOffset = highWord((DWord)handler);
}
void setIdt()
{
/* Program interrups/exception service routines */
idtR.base = (DWord)idt;
idtR.limit = IDT_ENTRIES * sizeof(Gate) - 1;
/* ADD INITIALIZATION CODE FOR INTERRUPT VECTOR */
setInterruptHandler(0x21, keyboard_handler, 0); // IDT entry 33
setInterruptHandler(0x20, clock_handler, 0); // IDT 32
setTrapHandler(0x80, system_call_handler, 3);
set_handlers();
set_idt_reg(&idtR);
}
void keyboard_service_routine() {
int bits_mask;
bits_mask = inb(0x60);
int mask_result = bits_mask&10000000; // break == released
// make == pressed
if (mask_result == 0) {
int letter_map = bits_mask%10000000; // 10 Millons
int character_to_print = char_map[letter_map];
if (character_to_print != '\0') character_to_print = 'C';
printc(character_to_print);
}
}
int cont = 0;
void clock_service_routine() {
zeos_show_clock();
++zeos_ticks;
}
int get_zeos_ticks() {
return zeos_ticks;
}