diff --git a/kernel/arch/x86_64/architecture/cpu.d b/kernel/arch/x86_64/architecture/cpu.d
index 41badd2..9d90a47 100644
--- a/kernel/arch/x86_64/architecture/cpu.d
+++ b/kernel/arch/x86_64/architecture/cpu.d
@@ -130,7 +130,8 @@ public:
 		const char[] ioInMixinB = `
 		asm {
 			naked;
-			in AL, ` ~ port ~ `;
+			mov DX, ` ~ port ~ `;
+			in AL, DX;
 			ret;
 		}`;
 	}
diff --git a/kernel/arch/x86_64/architecture/pci.d b/kernel/arch/x86_64/architecture/pci.d
index 163fe82..c604092 100644
--- a/kernel/arch/x86_64/architecture/pci.d
+++ b/kernel/arch/x86_64/architecture/pci.d
@@ -14,25 +14,35 @@ static:
 
 	// Description: Will read a uint from PCI.
 	uint read32(uint address) {
-		// write out address
-		Cpu.ioOut!(uint, "0xcf8")(address);
+		_setAddress(address);
 
 		// get offset
 		ushort offset = cast(ushort)(address & 0xff);
 
 		// read in data
-		Cpu.ioIn!(uint, "0xcfc")();
-		return 0;
+		return Cpu.ioIn!(uint, "0xcfc")();
 	}
 
 	// Description: Will read a ushort from PCI.
 	ushort read16(uint address) {
-		return 0;
+		_setAddress(address);
+
+		// get offset
+		ushort offset = cast(ushort)(address & 0xff);
+
+		// read in data
+		return Cpu.ioIn!(ushort, "0xcfc")();
 	}
 
 	// Description: Will read a ubyte from PCI.
 	ubyte read8(uint address) {
-		return 0;
+		_setAddress(address);
+
+		// get offset
+		ushort offset = cast(ushort)(address & 0xff);
+
+		// read in data
+		return Cpu.ioIn!(ubyte, "0xcfc")();
 	}
 
 	// Description: Will write to PCI.
@@ -48,4 +58,8 @@ static:
 	}
 
 private:
+	void _setAddress(uint address) {
+		// write out address
+		Cpu.ioOut!(uint, "0xcf8")(address);
+	}
 }