working timer interrupt

interrupts.c

@@ -4,6 +4,7 @@
 #include "mem.h"
 #include "types.h"
 #include "ports.h"
+#include "pit.h"
 
 const char* err_msg[] = {
 	"Divide by zero\n",
@@ -84,7 +85,7 @@ extern void irq_handler_13();
 extern void irq_handler_14();
 extern void irq_handler_15();
 
-void* irq_handlers[16];
+void* irq_handlers[16] = {0};
 
 void setup_idt_entry(u32 t_idx, u32 base, u16 sel, u8 type_attrs) {
 	// Configuring a single given entry in the IDT table
@@ -116,7 +117,8 @@ void init_irq_handler(u32 irq, void (*handler)(struct cpu_reg_state* cpu)) {
 void irq_handler(struct cpu_reg_state* cpu) {
 	void (*handler)(struct cpu_reg_state* cpu);
 	// Dispatcher for irq's
-	handler = irq_handlers[cpu->int_no];
+	handler = irq_handlers[cpu->int_no - 0x20];
+	// Handler the timer by hand because fuck this tbh
 	if(handler) {
 		handler(cpu);
 	}
@@ -178,6 +180,8 @@ void init_idt() {
 
 	// clear table in case there's garbage in there
 	memset((u8*)irq_handlers, 0, sizeof(void*));
+	irq_handlers[0] = inc_ticks; // LULW
+
 	// Remap irq's to proper location
 	serialport_write_byte(0x20, 0x11);
 	serialport_write_byte(0xA0, 0x11);

kernel.c

@@ -18,7 +18,7 @@ void kprintp(const u32 ptr) {
 	const char _chars[] = "0123456789abcdef";
 	u32 idx = 0; // used as hash into the _chars mapping
 	// iterate over each nibble
-	for(u32 i = 0 ;i < 7;i++) {
+	for(u32 i = 0 ;i < 8;i++) {
 		idx = (ptr << (i * 4)) & 0xf0000000;
 		idx = idx >> 28;
 		putch(_chars[idx]);
@@ -32,5 +32,5 @@ void kprints(const char* s) {
 // Should kmain return, we fall back to the loader which then just keeps in a hung state
 void kmain() {
 	kinit();
-	kprints("i guess we're good now?");
+	timer_wait(50); // in ms
 }

pit.c

@@ -8,9 +8,6 @@ volatile u32 timer_ticks = 0;
 
 void inc_ticks(struct cpu_reg_state* cpu) {
     timer_ticks++;
-    if(timer_ticks % 18 == 0) {
-        printf("One second passed\n");
-    }
 }
 
 void timer_wait(u32 time) {

pit.h

@@ -1,3 +1,5 @@
+#ifndef PIT_H
+#define PIT_H
 #include "interrupts.h"
 #include "types.h"
 
@@ -12,3 +14,4 @@ void inc_ticks(struct cpu_reg_state*);
 void timer_wait(u32);
 
 void pit_install_timer(void);
+#endif

stlio.c

@@ -49,7 +49,7 @@ void printhex(u32 num) {
 	u32 idx = 0; // used as hash into the _chars mapping
 	// iterate over each nibble
 	for(u32 i = 0 ;i < 8;i++) {
-		idx = (ptr << (i * 4)) & 0xf0000000;
+		idx = (num << (i * 4)) & 0xf0000000;
 		idx = idx >> 28;
 		putch(_chars[idx]);
 	}