feat(io): IoPort

kernel/src/Io/IoPort.hpp

@@ -0,0 +1,41 @@
+/*
+    * PortIo.hpp
+    * Inline Intel port IO functions
+    * Copyright (c) 2025 Daniel Hammer
+*/
+
+#pragma once
+#include <cstdint>
+
+namespace Io {
+    // OSDev website has the parameters for out(b/w/l) in the opposite order in their example,
+    // (port, then value), but the manpage on GNU ('man outb') has it in this order.
+
+    inline void Out8(uint8_t value, uint16_t port) {
+        asm ("outb %0, %1" : : "a"(value), "Nd"(port) : "memory");
+    }
+
+    inline void Out16(uint16_t value, uint16_t port) {
+        asm ("outw %0, %1" : : "a"(value), "Nd"(port) : "memory");
+    }
+
+    inline void Out32(uint32_t value, uint16_t port) {
+        asm ("outl %0, %1" : : "a"(value), "Nd"(port) : "memory");
+    }
+
+    inline uint8_t In8(uint16_t port) {
+        asm ("inb %0" : : "Nd"(port) : "memory");
+    }
+
+    inline uint16_t In16(uint16_t port) {
+        asm ("inw %0" : : "Nd"(port) : "memory");
+    }
+
+    inline uint32_t In32(uint16_t port) {
+        asm ("inl %0" : : "Nd"(port) : "memory");
+    }
+
+    inline void IoPortWait() {
+        Out8(0x80, 0);
+    }
+};