Added code to setup and build the IDT. Updated the Bochs' configuration file to allow break points to be set and did some general code clean-up.

includes/idt.h

@@ -0,0 +1,21 @@
+#ifndef IDT_H
+#define IDT_H
+struct idt_entry
+{
+    unsigned short base_lo;
+    unsigned short sel;        /* Our kernel segment goes here. */
+    unsigned char always0;
+    unsigned char flags;
+    unsigned short base_hi;
+} __attribute__((packed));
+
+struct idt_ptr
+{
+    unsigned short size;
+    struct idt_entry* idt_entries_start;
+} __attribute__((packed));
+
+void install_idt(void);
+void idt_set_gate(struct idt_entry*, unsigned long, unsigned short, unsigned char);
+void load_idt(struct idt_ptr*);
+#endif

includes/interrupt_handler.h

@@ -0,0 +1,46 @@
+#ifndef INTERRUPT_HANDLER_H
+#define INTERRUPT_HANDLER_H
+
+struct isr_state
+{
+	unsigned int gs, fs, es, ds;				// The segement registers pushed last
+	unsigned int edi, esi, edp, esp, ebx, eax;	// Pushed by pusha
+	unsigned int int_no, error;					// Data pushed by the 'isr#' routines.
+	unsigned int eip, cs, eflags, useresp, ss;	// Pushed by the processor
+};
+
+void interrupt_handler(struct isr_state);
+extern void isr0();
+extern void isr1();
+extern void isr2();
+extern void isr3();
+extern void isr4();
+extern void isr5();
+extern void isr6();
+extern void isr7();
+extern void isr8();
+extern void isr9();
+extern void isr10();
+extern void isr11();
+extern void isr12();
+extern void isr13();
+extern void isr14();
+extern void isr15();
+extern void isr16();
+extern void isr17();
+extern void isr18();
+extern void isr19();
+extern void isr20();
+extern void isr21();
+extern void isr22();
+extern void isr23();
+extern void isr24();
+extern void isr25();
+extern void isr26();
+extern void isr27();
+extern void isr28();
+extern void isr29();
+extern void isr30();
+extern void isr31();
+
+#endif

includes/loader.h

@@ -0,0 +1,11 @@
+#ifndef LOADER_H
+#define LOADER_H
+
+struct multiboot_header 
+{
+	unsigned long magic;
+	unsigned long flags;
+	unsigned long checksum;
+};
+
+#endif

includes/serial.h

@@ -20,4 +20,5 @@
 void set_serial_baud_rate(unsigned short, unsigned short);
 void configure_serial_line(unsigned short);
 int serial_transmit_fifo_empty(unsigned int);
+void write_to_com(unsigned int, char*);
 #endif