feat: add fadt based lapic timer calibration

kernel/include/util/port_io.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "util/number.h"
+
+inline uint8_t port_read_8(uint16_t port) {
+    uint8_t value = 0;
+    __asm__ volatile("inb %1, %0" : "=a"(value) : "Nd"(port));
+    return value;
+}
+
+inline uint16_t port_read_16(uint16_t port) {
+    uint16_t value = 0;
+    __asm__ volatile("inw %1, %0" : "=a"(value) : "Nd"(port));
+    return value;
+}
+
+inline uint32_t port_read_32(uint16_t port) {
+    uint32_t value = 0;
+    __asm__ volatile("inl %1, %0" : "=a"(value) : "Nd"(port));
+    return value;
+}
+
+inline void port_write_8(uint16_t port, uint8_t value) {
+    __asm__ volatile("outb %0, %1" : : "a"(value), "Nd"(port));
+}
+
+inline void port_write_16(uint16_t port, uint16_t value) {
+    __asm__ volatile("outw %0, %1" : : "a"(value), "Nd"(port));
+}
+
+inline void port_write_32(uint16_t port, uint32_t value) {
+    __asm__ volatile("outl %0, %1" : : "a"(value), "Nd"(port));
+}