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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 <utils.h>
#include <sched.h>
#include <zeos_interrupt.h>
extern struct task_struct * idle_task;
extern struct task_struct * init_task;
extern struct task_struct * fill_task;
extern struct keyboard_buffer key_buffer;
extern struct list_head readyqueue;
Gate idt[IDT_ENTRIES];
Register idtR;
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;
set_handlers();
/* ADD INITIALIZATION CODE FOR INTERRUPT VECTOR */
setInterruptHandler(33, keyboard_handler, 0);
setInterruptHandler(0x80, system_call_handler, 3);
setInterruptHandler(32, clock_handler, 0); // is in this privileged mode???
set_idt_reg(&idtR);
}
// function for printing the key pressed
void print_key(char key) {
printc_xy(0, 0, key);
}
// keyboard service routine
void keyboard_routine(void) {
struct list_head *e;
struct task_struct *t;
unsigned char c = inb(0x60);
if ((c & 0x80) == 0) { // make
char aux = char_map[c&0x7F];
if (aux != '\0') {
print_key(aux);
add_key(aux);
if (threads_waiting()) {
//sys_write(1,"esperant",8);
e = list_first(&key_buffer.keyboardqueue);
t = list_head_to_task_struct(e);
if (can_read(t->num_chars_to_read)) {
sys_write(1,"llegim",6);
list_del(e);
list_add_tail(e, &readyqueue);
}
}
//char b[1];
//itoa(current()->num_chars_to_read,b);
//sys_write(1,b,1);
//print_buffer(6);
}
else {
print_key('C');
}
}
else { // break
// do nothing
}
}
// clock service routine
void clock_routine() {
zeos_ticks = zeos_ticks + 1;
zeos_show_clock();
schedule();
}
/* antic case en keyboard
if (aux == 'a') {
print_key('A');
task_switch(idle_task);
}
else if (aux == 'b') {
print_key('B');
//task_switch(init_task);
}
else if (aux == '1') {
print_key('1');
task_switch(fill_task);
}
else {
*/