More ints stuff

kernel/interupt.c

@@ -13,14 +13,10 @@ typedef struct {
 	uint	base;
 } __attribute__((packed)) idtr;
 
-void init_IDT(uint type_attr) {
-	__attribute__((aligned(4)))
-	static idt_entry IDT[256];
-	static idtr	IDTR;
-}
+__attribute__((aligned(4)))
+static idt_entry IDT[IDT_MAX_DESCS];
+static idtr	IDTR;
 
-__attribute__((noreturn))
-void exception_handler(void);
 void exception_handler() {
 	__asm__ __volatile__("cli; hlt");
 }
@@ -30,3 +26,25 @@ void interupt_handler() {
 	// handle stuff
 	__asm__("popa; leave; iret");
 }
+
+void idt_set_desc(uint8 idx, void* isr, uint8 flags) {
+	idt_entry* desc = &IDT[idx]; // get descriptor
+
+	desc->offset_1	= (uint) isr & 0xffff;
+	desc->selector	= 0x05; // kernel code selector for the GDT (null is 0x0 - 0x4 => code is 0x05 to something...)
+	desc->reserved	= 0; 
+	desc->type_attr	= flags;
+	desc->offset_2	= (uint) isr >> 16;
+}
+
+extern void* isr_stub_table[];
+void idt_init() {
+	IDTR.base = (uintptr) &IDT[0]; // base offset
+	IDTR.limit = (uint16) sizeof(idt_entry) * IDT_MAX_DESCS - 1;
+
+	for (uint8 idx = 0; idx < 32; idx++) 
+		idt_set_desc(idx, isr_stub_table[idx], 0x8e);
+
+	__asm__ __volatile__("lidt %0" : : "m"(IDTR));
+	__asm__ __volatile__("sti");
+}

kernel/interupt.h

@@ -1,7 +1,12 @@
 #include "../lib/types.h"
 
+#define IDT_MAX_DESCS 256
+
 __attribute__((noreturn))
 void exception_handler();
 
 __attribute__((noreturn))
 void interupt_handler();
+
+void idt_set_desc(uint8, void*, uint8);
+void idt_init();

kernel/kernel.c

@@ -60,6 +60,8 @@ void print_kernel_stats() {
 }
 
 void kernel_init() {
+	idt_init();		// Enable interupts
+
 	vga_init(); 	// Initialize the screen first
 					// i.e. clear the screen et cetera.
 

kernel/kernel.h

@@ -1,3 +1,4 @@
+#include "interupt.h"
 #include "memory.h"
 #include "paging.h"
 #include "../drivers/vga.h"

lib/types.h

@@ -10,8 +10,9 @@ typedef unsigned char uint8;
 typedef short int int16;
 typedef unsigned short int uint16;
 
-// MISC
+// POINTERS 
 typedef char* pointer;
+typedef unsigned long int uintptr;
 
 // BOOL
 typedef int bool;