adds an idt

kernel/include/kernel/x86/idt.h

@@ -0,0 +1,26 @@
+#include <stdint.h>
+
+#ifndef ARCH_IDT_H
+#define ARCH_IDT_H
+
+#define IDT_MAX_DESCRIPTORS 32 // number of entries in the idt table, 32 i believe
+
+void exception_handler(void);
+
+typedef struct {
+	uint16_t isr_low;	// The lower 16 bits of the ISR's address
+	uint16_t kernel_cs;	// The GDT segment selector that the CPU will load into CS before calling the ISR
+	uint8_t reserved;	// set to zero
+	uint8_t attributes;	// Type and attributes
+	uint16_t isr_high;	// The higher 16 bits of the ISR's address
+} __attribute__((packed)) idt_entry_t;
+
+typedef struct {
+	uint16_t limit;
+	uint32_t base;
+} __attribute__((packed)) idtr_t;
+
+void idt_set_descriptor(uint8_t vector, void* isr, uint8_t flags);
+void idt_init(void);
+
+#endif