Bind interrupts

src/kernel/boot/kmain.c

@@ -12,6 +12,11 @@ int divide(int a, int b)
     return a/b;
 }
 
+registers *divbyzero(registers *r) {
+    PANIC("DIVIDE BY ZERO!");
+    return r;
+}
+
 void kmain(uint64_t multiboot_magic, void *multiboot_data)
 {
     vga_init();
@@ -35,6 +40,8 @@ void kmain(uint64_t multiboot_magic, void *multiboot_data)
 
     interrupt_init();
 
+    bind_interrupt(0, divbyzero);
+
     debug("Hello, world!");
 
     // Force a divide by zero error

src/kernel/cpu/interrupts.c

@@ -26,6 +26,7 @@ struct {
 }__attribute__((packed)) idtr;
 
 extern uintptr_t isr_table[];
+int_handler_t int_handlers[NUM_INTERRUPTS];
 
 void interrupt_init()
 {
@@ -45,8 +46,16 @@ void interrupt_init()
     load_idt(&idtr); // cpu/registers.S
 }
 
+int_handler_t bind_interrupt(uint32_t num, int_handler_t fn) {
+    int_handler_t old = int_handlers[num];
+    int_handlers[num] = fn;
+    return old;
+}
+
 registers *int_handler(registers *r)
 {
+    if(int_handlers[r->int_no])
+        return int_handlers[r->int_no](r);
     debug_error("Unhandled interrupt occurred\n");
     debug_error("Interrupt number: %d, Error code: %d\n", r->int_no, r->err_code);
     PANIC("Unhandled interrupt");

src/kernel/include/interrupts.h

@@ -28,5 +28,9 @@ typedef struct {
     uint64_t ss;
 } registers;
 
+typedef registers *(*int_handler_t)(registers *);
+
+// cpu/interrupts.c
 void interrupt_init();
 void isr_return(registers *);
+int_handler_t bind_interrupt(uint32_t num, int_handler_t fn);