Major libk restructuring, also rewrote drivers/serial.h

libk/include/cpu/idt.h

@@ -0,0 +1,28 @@
+#ifndef _CPU_IDT_H
+#define _CPU_IDT_H
+
+#include <stdint.h>
+
+#define IDT_ENTRIES 256
+
+#define TRAP_GATE_FLAGS    0x8f // P = 1, DPL = 00, S = 0, Type = 1111 (32-bit Trap gate)
+#define INT_GATE_FLAGS     0x8e // P = 1, DPL = 00, S = 0, Type = 1110 (32-bit Int gate)
+#define USR_INT_GATE_FLAGS 0xee // P = 1, DPL = 11, S = 0, Type = 1110 (32-bit Int gate)
+
+typedef struct {
+    uint16_t offsetLow;
+    uint16_t selector;
+    uint8_t zero;
+    uint8_t typeAttr;
+    uint16_t offsetHigh;
+} __attribute__ ((packed)) idtEntry_t;
+
+typedef struct {
+    uint16_t limit;
+    uint32_t base;
+} __attribute__ ((packed)) idtp_t;
+
+void idtSetGate(uint8_t i, void* handler, uint8_t flags);
+void setupIdt();
+
+#endif